阅读说明：本技术 偏心内孔零件加工夹具及偏心内孔零件加工方法 (Eccentric inner hole part machining clamp and eccentric inner hole part machining method ) 是由 张雅琼 肖贺华 胡志星 贺冶 吉鹏飞 秦杰 郭慧英 于 2020-04-30 设计创作，主要内容包括：本发明公开了一种偏心内孔零件加工夹具,偏心内孔零件上设有原有内孔和偏心内孔,原有内孔的孔轴线与偏心内孔零件的零件轴心线重合,偏心内孔的零件偏心轴线偏离于零件轴心线设置,偏心内孔零件加工夹具包括工件定位盘和定位紧固件,工件定位盘的中央沿轴向凹设有找正圆内孔,工件定位盘以找正圆内孔的内孔中轴线为旋转中心线旋转,定位紧固件用于将偏心内孔零件沿工件定位盘的轴向定位固定在工件定位盘的安装面上,并使零件偏心轴线与内孔中轴线重合布设。本发明还提供一种偏心内孔零件的加工方法。本发明的偏心内孔零件加工夹具,实现加工偏心内孔时进刀量控制及在线测量,提高了偏心内孔零件的偏心内孔的加工合格率和加工效率。(The invention discloses an eccentric inner hole part machining clamp, wherein an original inner hole and an eccentric inner hole are formed in an eccentric inner hole part, the hole axis of the original inner hole is overlapped with the part axis of the eccentric inner hole part, the part eccentric axis of the eccentric inner hole is arranged to deviate from the part axis, the eccentric inner hole part machining clamp comprises a workpiece positioning disc and a positioning fastener, an aligning circular inner hole is formed in the center of the workpiece positioning disc in a concave mode along the axial direction, the workpiece positioning disc rotates by taking the inner hole axis of the aligning circular inner hole as a rotating center line, and the positioning fastener is used for positioning and fixing the eccentric inner hole part on the mounting surface of the workpiece positioning disc along the axial direction of the workpiece positioning disc and enabling the part eccentric axis to be arranged in an overlapped. The invention also provides a processing method of the eccentric inner hole part. The eccentric inner hole part machining clamp disclosed by the invention realizes the control of the feed amount and the online measurement during the machining of the eccentric inner hole, and improves the machining qualification rate and the machining efficiency of the eccentric inner hole part.)

1. The utility model provides an eccentric hole parts machining anchor clamps is equipped with original hole (101) and eccentric hole (102) on the eccentric hole part, the hole axis of original hole (101) with the part axial lead (1011) coincidence of eccentric hole part, the part eccentric axis (1021) of eccentric hole (102) deviate from part axial lead (1011) setting, its characterized in that,

the eccentric inner hole part machining clamp comprises a workpiece positioning disc (201) and a positioning fastener (202),

an alignment round inner hole (2011) is axially and concavely arranged in the center of the workpiece positioning disc (201), the workpiece positioning disc (201) rotates by taking an inner hole central axis (2013) of the alignment round inner hole (2011) as a rotating central line,

the positioning fastener (202) is used for positioning and fixing the eccentric inner hole part on the mounting surface of the workpiece positioning disc (201) along the axial direction of the workpiece positioning disc (201), and the eccentric axis (1021) of the part is arranged in a manner of being overlapped with the inner hole central axis (2013).

2. The eccentric bore part machining jig of claim 1,

a plurality of positioning fastening holes (2012) distributed along the axial direction are arranged on the workpiece positioning disc (201),

the positioning fastener (202) axially penetrates through the mounting hole on the part mounting edge of the eccentric inner hole part and extends into the positioning fastening hole (2012) to position and fix the eccentric inner hole part on the mounting surface of the workpiece positioning disc (201).

3. The eccentric bore part machining jig of claim 2,

the workpiece positioning disc (201) is a step disc with an annular boss at the inner edge, the positioning fastening hole (2012) comprises a positioning hole (20121) and a fastening hole (20122), the positioning hole (20121) is arranged on the annular boss of the workpiece positioning disc (201), the fastening hole (20122) is arranged on a base annular table on the outer side, away from the part axis (1011), of the annular boss of the workpiece positioning disc (201), the positioning holes (20121) are respectively positioned on a concentric circle with the part axis (1011) as a circle center line, and the fastening holes (20122) are respectively positioned on a concentric circle with the eccentric axis (1021) as a circle center line,

the positioning fastener (202) comprises a positioning piece (2021) and a fastener (2022), the positioning piece (2021) is used for axially penetrating through a mounting hole on a part mounting edge of the eccentric inner hole part and matching with the positioning hole (20121) to position the eccentric inner hole part on the annular boss, and the fastener (2022) is used for matching with the fastening hole (20122) to press and fix the positioned eccentric inner hole part on the annular boss of the workpiece positioning disc (201).

4. The eccentric inner hole part machining jig of claim 3,

the positioning hole (20121) is a stepped hole which is distributed along the direction of the fixing surface of the workpiece positioning disc (201) facing the mounting surface, the end surface of the small aperture of the stepped hole is provided with a threaded hole which is distributed along the axial direction,

the positioning piece (2021) comprises a positioning pin (20211), a positioning bush (20212) and a fixing screw (20213), the positioning bush (20212) is arranged in the positioning hole (20121) along the direction of the fixing surface of the workpiece positioning disc (201) towards the mounting surface, the fixing screw (20213) sequentially penetrates through the mounting edge of the positioning bush (20212) along the axial direction and is matched with the threaded hole to fix the bush in the positioning hole (20121),

the positioning pin (20211) sequentially penetrates through the mounting hole on the part mounting edge of the eccentric inner hole part, the positioning hole (20121) and the positioning bushing (20212) along the axial direction.

5. The eccentric bore part machining jig of claim 4,

the number of the positioning holes (20121) is three, the three positioning holes (20121) are uniformly distributed along the circumferential distance of the workpiece positioning disc (201) by taking the part axial lead (1011) as a circular lead,

the number of the fastening holes (20122) is three, and the three fastening holes (20122) are uniformly distributed along the circumferential distance of the workpiece positioning disc (201) by taking the eccentric axis (1021) as a circular center line.

6. The eccentric inner hole part machining jig of claim 5,

the positioning pin (20211) comprises a force application end and a positioning end which are arranged along the axial direction, the positioning end comprises a cylindrical section and a conical section, and the cylindrical section is arranged at one end, far away from the force application end, of the conical section.

7. The eccentric inner hole part machining jig of claim 6,

the positioning holes (20121) comprise a first positioning hole, a second positioning hole and a third positioning hole which are uniformly distributed along the circumferential direction at intervals by taking the axial lead (1011) of the part as a circle center line, a first mark, a second mark and a third mark are respectively arranged on the mounting surface of the workpiece positioning disc (201), the first mark is correspondingly distributed with the first positioning hole, the second mark is correspondingly distributed with the second positioning hole, and the third mark is correspondingly distributed with the third positioning hole,

the positioning pin (20211) includes a first positioning pin (20211a) which is clearance-fitted to the first positioning hole, a second positioning pin (20211b) which is clearance-fitted to the second positioning hole, and a third positioning pin which is clearance-fitted to the third positioning hole.

8. The eccentric bore part machining jig of claim 7,

the workpiece positioning disc (201) is also provided with a transportation screw hole which is arranged at the outer side of the positioning hole (20121),

the fastener (2022) comprises a clamping plate (20221), a fastening unit (20222) and a top bracing bolt (20223), the clamping plate (20221) is fastened on the workpiece positioning disc (201) through the fastening unit (20222) and presses and fixes the part mounting edge of the eccentric inner hole part on the annular boss of the workpiece positioning disc (201), and the top bracing bolt (20223) is arranged in the transportation screw hole to support the clamping plate (20221) and is matched with the fastening unit (20222) to jointly fix the clamping plate (20221).

9. The eccentric bore part machining jig of claim 8,

the workpiece positioning disc (201) is also provided with a plurality of assembling holes which are respectively positioned on a concentric circle taking the inner hole central axis (2013) of the alignment circle inner hole (2011) as a circle center line,

the eccentric inner hole part machining clamp further comprises a mounting piece which is used for penetrating through the assembly hole in the axial direction and mounting the workpiece positioning disc (201) on a machine tool.

10. A method for machining an eccentric bore part by using the eccentric bore part machining jig according to any one of claims 1 to 9, comprising the steps of:

positioning and fixing the eccentric inner hole part to be processed on a workpiece positioning disc (201) through a positioning fastener (202);

the inner wall of the alignment circular inner hole (2011) on the workpiece positioning disc (201) faces a dial indicator arranged on a machine tool for zero calibration to obtain a measurement datum;

moving the dial indicator with the measurement reference to the inner wall surface of the eccentric inner hole (102) to be processed from the inner wall surface of the alignment circular inner hole (2011), rotating the eccentric inner hole part to be processed to obtain a run-out value of the eccentric inner hole measured by the dial indicator, and comparing the run-out value with the measurement reference to obtain the machining allowance;

and setting a feed amount according to the machining allowance, and enabling the eccentric inner hole part to be machined to rotate along an inner hole central axis (2013) of the alignment circle inner hole (2011) as a rotation central line for machining.

Technical Field

The invention relates to the technical field of machining equipment, in particular to an eccentric inner hole part machining clamp. The invention also relates to a method for machining the eccentric inner hole part.

Background

As shown in fig. 1 and 2, in the aircraft engine, an eccentric arc segment part (eccentric inner hole part) 100 includes an original inner hole 101 and an eccentric inner hole 102, and a part eccentric axis 1021 (eccentric center line) of the eccentric inner hole 102 is offset from a hole axis (part axis 1011) of the original inner hole 101 by a distance of L in an angle α direction. When the eccentric inner hole part 100 is machined, the eccentric inner hole 102 which is offset from the hole axis by the distance of L in the direction of the angle alpha is required to be ground, and because the eccentric inner hole 102 to be machined is not coincident with the reference center line of the eccentric inner hole part, the rotation center line of the eccentric inner hole 102 to be machined cannot be found during machining, and machining cannot be carried out.

The eccentric inner hole 102 to be machined is an arc segment with the eccentric axis 1021 of the part as a central line. The existing clamp for machining the eccentric inner hole part has no feasible measuring means to realize the online measurement of the eccentric inner hole, can not prepare for calculating and controlling the feed amount during machining, brings great difficulty to the machining of the eccentric inner hole part, and has low machining qualification rate and machining efficiency of the eccentric arc of the eccentric inner hole part.

Disclosure of Invention

The invention provides an eccentric inner hole part machining clamp, which aims to solve the technical problems that in the prior art, when an eccentric inner hole of an eccentric inner hole part is machined, the machining size of the eccentric inner hole part during machining cannot be measured on line, the feed amount during machining cannot be controlled accurately, the eccentric circular arc machining yield of the eccentric inner hole part is low, and the machining efficiency is low.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

the utility model provides an eccentric hole parts machining anchor clamps, be equipped with original hole and eccentric hole on the eccentric hole part, the hole axis of original hole and the part axial lead coincidence of eccentric hole part, the part eccentric axis of eccentric hole is skew to be set up in the part axial lead, eccentric hole parts machining anchor clamps include work piece positioning disk and location fastener, the central authorities of work piece positioning disk are equipped with the alignment circle hole along the axial is recessed, the work piece positioning disk uses the hole axis of alignment circle hole as the rotation center line rotation, the location fastener is used for fixing eccentric hole part on the installation face of work piece positioning disk along the axial positioning of work piece positioning disk to make part eccentric axis and hole axis coincidence lay.

Furthermore, a plurality of positioning fastening holes distributed along the axial direction are formed in the workpiece positioning disc, and the positioning fastening piece axially penetrates through the mounting hole in the part mounting edge of the eccentric inner hole part and extends into the positioning fastening hole so as to fix the eccentric inner hole part on the mounting surface of the workpiece positioning disc.

Furthermore, the workpiece positioning disk is a step disk with an annular boss at the inner edge, the positioning fastening hole comprises a positioning hole and a fastening hole, the positioning hole is arranged on the annular boss of the workpiece positioning disk, the fastening hole is arranged on a base body annular table of the outer side, far away from the axis of the part, of the annular boss of the workpiece positioning disk, the positioning holes are respectively located on a concentric circle with the axis of the part being the axis of the circle, the fastening holes are respectively located on a concentric circle with the eccentric axis being the line of the circle center, the positioning fastener comprises a positioning part and a fastening part, the positioning part is used for penetrating through a mounting hole on the part mounting edge of the eccentric inner hole part along the axial direction and positioning the eccentric inner hole part on the annular boss in a matched mode with the fastening hole to compress and fix the positioned eccentric inner.

Furthermore, the locating hole is a step hole arranged along the direction of the fixing surface of the workpiece locating disc towards the mounting surface, a threaded hole arranged along the axial direction is formed in the end face of the small hole of the step hole, the locating piece comprises a locating pin, a locating bush and a fixing screw, the locating bush is arranged in the locating hole along the direction of the fixing surface of the workpiece locating disc towards the mounting surface, the fixing screw sequentially penetrates through the mounting edge of the locating bush along the axial direction and is matched with the threaded hole to fixedly arrange the bush in the locating hole, and the locating pin sequentially penetrates through the mounting hole in the part mounting edge of the eccentric inner hole part along the axial direction, the locating hole and the locating bush.

Furthermore, the number of the positioning holes is three, the three positioning holes are uniformly distributed along the circumferential distance of the workpiece positioning disc by taking the shaft axis of the part as the center line, the number of the fastening holes is three, and the three fastening holes are uniformly distributed along the circumferential distance of the workpiece positioning disc by taking the eccentric axis as the center line.

Furthermore, the locating pin includes the application of force end and the location end of laying along the axial, and the location end includes cylinder section and circular cone section, and the one end that the application of force end was kept away from to the circular cone section is located to the cylinder section.

Furthermore, the positioning holes comprise a first positioning hole, a second positioning hole and a third positioning hole which are uniformly distributed along the circumferential distance by taking the axial lead of the part as a circle center line, the mounting surface of the workpiece positioning disc is respectively provided with a first identifier, a second identifier and a third identifier, the first identifier is correspondingly distributed with the first positioning hole, the second identifier is correspondingly distributed with the second positioning hole, the third identifier is correspondingly distributed with the third positioning hole, and the positioning pins comprise a first positioning pin in clearance fit with the first positioning hole, a second positioning pin in clearance fit with the second positioning hole and a third positioning pin in clearance fit with the third positioning hole.

Furthermore, still be equipped with the transportation screw on the work piece positioning dish, the outside fastener that the locating hole was located to the transportation screw includes splint, fastening unit and shore bolt, and splint pass through the fastening unit fastening on the work piece positioning dish and compress tightly the part installation limit of eccentric hole part and fix on the cyclic annular boss of work piece positioning dish, and shore bolt is located in the transportation screw with the support splint and with the fastening unit cooperation fixed splint jointly.

Furthermore, the workpiece positioning disc is further provided with assembling holes, the assembling holes are respectively positioned on a concentric circle which takes the central axis of the inner hole of the aligned circular inner hole as the circular center line, and the eccentric inner hole part machining clamp further comprises an installing part which is used for penetrating through the assembling holes along the axial direction and installing the workpiece positioning disc on a machine tool.

The invention also provides a processing method of the eccentric inner hole part, and the processing clamp of the eccentric inner hole part comprises the following steps: positioning and fixing the eccentric inner hole part to be processed on a workpiece positioning disc through a positioning fastener; zero calibration is carried out on the inner wall of the alignment circular inner hole on the workpiece positioning disc facing a dial indicator arranged on a machine tool, so as to obtain a measurement datum; moving the dial indicator with the measurement reference to the inner wall surface of the eccentric inner hole to be processed from the inner wall surface of the aligned circular inner hole, rotating the eccentric inner hole part to be processed to obtain a run-out value of the eccentric inner hole measured by the dial indicator, and comparing the run-out value with the measurement reference to obtain the machining allowance; and setting the feed amount according to the machining allowance, and rotating the eccentric inner hole part to be machined along the inner hole central axis of the alignment circle inner hole as a rotating central line for machining.

The invention has the following beneficial effects:

according to the eccentric inner hole part machining clamp, the eccentric inner hole part is positioned and fixed on the workpiece positioning disc through the positioning fastener to be machined, so that the workpiece positioning disc rotates on the basis that the central axis of an inner hole of an aligned circular inner hole is taken as a rotating central line, the eccentric inner hole part rotates on the eccentric axis to be machined, and the eccentric inner hole is conveniently machined; an alignment circle inner hole corresponding to an eccentric inner hole to be processed is concavely arranged on a workpiece positioning disc, an eccentric axis is arranged in a superposition mode with an inner hole central axis, the aperture of the alignment circle inner hole is the same as that of the eccentric inner hole, the alignment circle inner hole is made to correspond to the eccentric inner hole to be processed of an eccentric inner hole part, so that the measuring reference of the eccentric inner hole is transferred to the inner wall surface of the alignment circle inner hole of a processing fixture, specifically, when the eccentric inner hole of the eccentric inner hole part is processed, only a dial indicator is arranged on a machine tool, then, the dial indicator is corrected in a zero position by taking the inner wall surface of the alignment circle inner hole as the measuring reference, finally, the corrected dial indicator is moved axially to enable the dial indicator to be abutted against the inner wall surface of the eccentric inner hole to be processed, the eccentric part is rotated to observe a runout value of the dial indicator, and the runout value and the measuring reference are compared, so that the, the processing qualification rate and the processing efficiency of the eccentric inner hole part are improved.

In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic view of the eccentric inner bore component of the present invention;

FIG. 2 is a cross-sectional view of the eccentric bore component of the present invention;

FIG. 3 is a schematic view of an assembly structure of the eccentric inner hole part machining clamp and the eccentric inner hole part according to the preferred embodiment of the present invention;

FIG. 4 is a sectional view showing an assembling structure of the eccentric inner hole part machining jig and the eccentric inner hole part according to the preferred embodiment of the present invention;

FIG. 5 is a schematic structural view of a first alignment pin in accordance with a preferred embodiment of the present invention;

fig. 6 is a schematic structural view of a second aligning pin according to a preferred embodiment of the present invention.

Illustration of the drawings:

100. an eccentric bore part; 101. original inner hole; 1011. the axial lead of the part; 102. an eccentric inner hole; 1021. an eccentric axis of the part; 200. an eccentric inner hole part machining clamp; 201. a workpiece positioning plate; 2011. aligning the round inner hole; 2012. positioning the fastening hole; 2013. an inner bore central axis; 20121. positioning holes; 20122. a fastening hole; 202. positioning a fastener; 2021. a positioning member; 20211. positioning pins; 20211a, a first alignment pin; 20211b, a second locating pin; 20212. positioning the bushing; 20213. a set screw; 2022. a fastener; 20221. a splint; 20222. a fastening unit; 20223. and (4) jacking bolts.

Detailed Description

The embodiments of the invention will be described in detail below with reference to the accompanying drawings, but the invention can be embodied in many different forms, which are defined and covered by the following description.

FIG. 1 is a schematic view of the eccentric inner bore component of the present invention; FIG. 2 is a cross-sectional view of the eccentric bore component of the present invention; FIG. 3 is a schematic view of an assembly structure of the eccentric inner hole part machining clamp and the eccentric inner hole part according to the preferred embodiment of the present invention; FIG. 4 is a sectional view showing an assembling structure of the eccentric inner hole part machining jig and the eccentric inner hole part according to the preferred embodiment of the present invention; FIG. 5 is a schematic structural view of a first alignment pin in accordance with a preferred embodiment of the present invention; fig. 6 is a schematic structural view of a second aligning pin according to a preferred embodiment of the present invention.

As shown in fig. 2, 3, 4, 5 and 6, in the eccentric inner hole part processing fixture 200 of this embodiment, an original inner hole 101 and an eccentric inner hole 102 are provided on an eccentric inner hole part 100, a hole axis of the original inner hole 101 coincides with a part axis 1011 of the eccentric inner hole part 100, a part eccentric axis 1021 of the eccentric inner hole 102 is offset from the part axis 1011, and the eccentric inner hole processing fixture includes a workpiece positioning disk 201 and a positioning fastener 202, an aligned circular inner hole 2011 is recessed in a center of the workpiece positioning disk 201 along an axial direction, the workpiece positioning disk 201 rotates with an inner hole central axis 2013 of the aligned circular inner hole 2011 as a rotation central axis, and the positioning fastener 202 is used for positioning and fixing the eccentric inner hole part 100 on a mounting surface of the workpiece positioning disk 201 along the axial direction of the workpiece positioning disk 201, and enabling the part eccentric axis 1021 to coincide with the inner hole.

According to the eccentric inner hole part machining clamp 200, the eccentric inner hole part 100 is fixed on the workpiece positioning disc 201 through the positioning fastener to be machined, so that the workpiece positioning disc 201 rotates by taking the inner hole central axis 2013 of the aligned round inner hole 2011 as a rotating central line, the eccentric inner hole part 100 rotates by taking the eccentric axis of a part to be machined, and the eccentric inner hole 102 is conveniently machined; an alignment circular inner hole 2011 corresponding to the eccentric inner hole 102 to be machined is concavely arranged on the workpiece positioning disc 201, the eccentric axis 1021 of the part is arranged to be overlapped with the central axis 2013 of the inner hole, so that the measuring reference of the eccentric inner hole 102 is transferred to the inner wall surface of the alignment circular inner hole 2011 of the machining fixture, specifically, when the eccentric inner hole 102 of the eccentric inner hole part 100 is machined, only a dial indicator needs to be arranged on a machine tool, then, the inner wall surface of the alignment circular inner hole 2011 is taken as the measuring reference to perform zero correction on the dial indicator, finally, the corrected dial indicator is moved axially to enable the dial indicator to be abutted against the inner wall surface of the eccentric inner hole 102 to be machined, the eccentric inner hole part 100 to be machined is rotated to observe the run-out value of the dial indicator, the inner wall surface of the alignment circular inner hole 2011 is taken as the measuring reference, the run-out value is compared with the measuring reference, so that the feed amount control, and the processing qualification rate and the processing efficiency of the eccentric inner hole 102 of the eccentric inner hole part 100 are improved.

It can be understood that the aperture of the alignment circular inner hole 2011 and the aperture of the eccentric inner hole 102 may be the same or different in the present invention, and when the aperture of the alignment circular inner hole 2011 and the aperture of the eccentric inner hole 102 are the same, the difference between the aperture of the alignment circular inner hole 2011 and the aperture of the standard eccentric inner hole 102 is zero; when the diameter of the alignment circular inner hole 2011 is different from the diameter of the eccentric inner hole 102, the correction is carried out by taking the difference between the preset diameter of the alignment circular inner hole 2011 and the diameter of the standard eccentric inner hole 102 as a zero position.

Preferably, the aperture size of the alignment circle inner hole 2011 on the workpiece positioning plate 201 is the aperture size of the eccentric inner hole 102 of the part, so that the aperture of the alignment circle inner hole 2011 is the same as the aperture of the eccentric inner hole 102, and the feed control and online measurement during the eccentric part processing are facilitated.

Optionally, the workpiece positioning disc 201 is a cylindrical chuck, the aperture of the alignment circle inner hole 2011 is consistent with the aperture of the eccentric inner hole 102 processed by the eccentric inner hole part 100, so that the alignment circle inner hole 2011 corresponds to the eccentric inner hole 102 to be processed of the eccentric inner hole part 100, and thus the measurement reference of the eccentric inner hole 102 of the eccentric inner hole part 100 is transferred to the inner wall surface of the alignment circle inner hole 2011 of the workpiece positioning disc 201, and the measurement reference of the eccentric inner hole 102 is formed on the inner wall surface of the workpiece positioning disc 201, so that the size of the eccentric inner hole 102 to be processed can be measured on line conveniently; the positioning fastener 202 is used for positioning and fixing the eccentric inner hole part 100 on the mounting surface of the workpiece positioning disc 201 along the axial direction of the workpiece positioning disc 201, the positioning fastener 202 can be a bolt fastener 2022, a buckle fastener 2022 or the like, as long as the positioning fastener 202 is used for positioning and fixing the eccentric inner hole part 100 on the workpiece positioning disc 201 along the axial direction of the workpiece positioning disc 201, so that the inner hole central axis 2013 on the workpiece positioning disc 201 is coaxial with the eccentric inner hole 1021 of the eccentric inner hole part 100, and the eccentric inner hole part 100 is prevented from loosening during processing.

Furthermore, a plurality of positioning fastening holes 2012 arranged along the axial direction are formed in the workpiece positioning disk 201, and the positioning fastening member 202 axially penetrates through the mounting hole on the part mounting edge of the eccentric inner hole part and extends into the positioning fastening holes 2012 to position and fix the eccentric inner hole part on the mounting surface of the workpiece positioning disk 201. It can be understood that a plurality of positioning fastening holes 2012 are respectively positioned on a concentric circle which takes the part axis 1011 of the eccentric inner hole part clamped on the eccentric inner hole part processing clamp as a circular axis; or a plurality of positioning fastening holes 2012 are respectively positioned on a concentric circle which takes the eccentric axis 1021 of the eccentric inner hole part clamped on the eccentric inner hole part processing clamp as a circular center line.

Referring again to fig. 1 and 2, the eccentric bore component 100 includes a radially outwardly extending component mounting edge with a mounting hole formed therein.

Further, the workpiece positioning disk 201 is a stepped disk with an annular boss at the inner edge, the positioning fastening hole 2012 comprises a positioning hole 20121 and a fastening hole 20122, the positioning hole 20121 is arranged on the annular boss of the workpiece positioning disk 201, the fastening hole 20122 is arranged on an annular base table at the outer side of the annular boss of the workpiece positioning disk 201 away from the part axis 1011, the positioning holes 20121 are respectively located on a concentric circle with the part axis 1011 being a circular axis, the fastening holes 20122 are respectively located on a concentric circle with the eccentric axis 1021 being a circular axis, the positioning fastening member 202 comprises a positioning member 2021 and a fastening member 2022, the positioning member 2021 is used for passing through a mounting hole on the part mounting edge of the eccentric inner hole part along the axial direction and is matched with the positioning hole 20121 to position the eccentric inner hole part on the annular boss, and the fastening member 2022 is used for being matched with the fastening hole 20122 to press and fix the positioned eccentric inner. Specifically, when the eccentric inner hole part 100 is installed, the positioning element 2021 only needs to sequentially pass through the part positioning through hole on the part installation edge and the positioning hole 20121 on the workpiece positioning disk 201 to be fixed, so that the eccentric inner hole part 100 can be rapidly assembled, and the to-be-processed eccentric inner hole 1021 of the eccentric inner hole part 100 is overlapped with the inner hole central axis 2013.

It can be understood that, in the present embodiment, the plurality of positioning holes 20121 are respectively located on a concentric circle whose part axis 1011 is a circular center line, and the plurality of fastening holes 20122 are respectively located on a concentric circle whose eccentric axis 1021 is a circular center line, so that the part is fixed along the circumferential direction of the rotation center line while the part is convenient to mount and position, and the stress balance during the part processing is ensured; alternatively, the plurality of positioning holes 20121 may be respectively located on a concentric circle whose part axis 1011 is a circular center line, and the plurality of fastening holes 20122 may be respectively located on a concentric circle whose part axis 1011 is a circular center line.

It can be understood that the workpiece positioning disk 201 is provided with a plurality of positioning fastening holes 2012 arranged along the circumferential direction, the positioning holes 20121 in the plurality of positioning fastening holes 2012 are positioned on a concentric circle of the first axis offset by the distance L in the direction of the angle β from the inner hole central axis 2013, the positioning element 2021 in each positioning fastening element 202 axially passes through the positioning hole on the mounting edge of the eccentric female part 100 and cooperates with the positioning hole 20121 in the positioning fastening hole 2012 to position the eccentric female part 100 on the positioning disk 201, and the part 100 is fixed on the mounting surface of the workpiece positioning disk 201 by the fastening element 2022. It can be understood that, because the eccentric center line of the eccentric inner hole 1021 of the eccentric inner hole part 100 and the original reference center line of the eccentric inner hole part 100 of the inner hole axis 1011 are offset by the distance of L in the direction of the angle α, because the positioning hole 20121 of the eccentric inner hole part 100 is arranged by taking the original inner hole axis 1011 of the eccentric inner hole part 100 as the center, in order to make the positioning hole 20121 of the workpiece positioning disc correspond to the original inner hole 1011 of the eccentric inner hole part 100, the positioning hole 20121 needs to be arranged corresponding to the original inner hole 101 of the eccentric inner hole part 100, therefore, in order to facilitate the installation, the rotation center of the eccentric arc segment of the eccentric inner hole part 100 is ensured to be coaxial with the rotation center.

Optionally, the number of the positioning elements 2021 is multiple, the number of the fastening elements 2022 is multiple, and the workpiece positioning disk 201 and the eccentric inner hole part 100 are connected into a whole by the plurality of positioning elements 2021 and the fastening elements 2022, so that the rotation center of the eccentric arc segment of the eccentric inner hole part 100 coincides with the rotation center of the clamp.

Referring to fig. 4 again, the positioning hole 20121 is a stepped hole arranged along the direction from the fixing surface of the workpiece positioning disk 201 to the mounting surface, a threaded hole arranged along the axial direction is formed in the end surface of the small aperture of the stepped hole, the positioning element 2021 includes a positioning pin 20211, a positioning bushing 20212 and a fixing screw 20213, the positioning bushing 20212 is arranged in the positioning hole 20121 along the direction from the fixing surface of the workpiece positioning disk 201 to the mounting surface, the fixing screw 20213 sequentially penetrates through the mounting edge of the positioning bushing 20212 along the axial direction and is matched with the threaded hole to fix the bushing in the positioning hole 20121, and the positioning pin 20211 sequentially penetrates through the mounting hole on the part mounting edge of the eccentric inner hole part 100 and the positioning hole 20121 and the positioning bushing 20212 on the workpiece positioning disk in the axial direction. It can be understood that, in the embodiment of the present invention, the fixing surface of the workpiece positioning disk 201 is the surface of the workpiece positioning disk 201 attached to the machine tool, and the mounting surface of the workpiece positioning disk 201 is the surface of the workpiece positioning disk 201 attached to the eccentric inner hole part, in order to avoid deformation of the eccentric inner hole part 100 caused by suspension of the pressing point, the bushing is installed into the fixture from the bottom surface of the fixture and fixed by screws, so that the part mounting edge of the eccentric inner hole part 100 directly contacts with the processing surface of the workpiece positioning disk 201 and does not directly contact with the positioning bushing 20212, thereby ensuring that the plane contacting with the eccentric inner hole part 100 is a complete plane while positioning is performed by matching the positioning pin 20211 with the positioning bushing 20212, and preventing the eccentric inner hole part 100 from deforming at the time of press fastening.

More preferably, in order to improve the convenience in pressing the eccentric female part 100 against the workpiece positioning plate 201, the fastening holes 20122 are circumferentially arranged adjacent to the positioning holes 20121, so that the fasteners 2022 are fixed near the positioning members 2021. Interference in assembling the eccentric bore part 100 after the work puck is mounted on the machine tool can be avoided.

Further, the number of the positioning holes 20121 is three, the three positioning holes 20121 are uniformly arranged along the circumferential direction of the workpiece positioning plate 201 with the part axis 1011 as a circular center, the number of the fastening holes 20122 is three, and the three fastening holes 20122 are uniformly arranged along the circumferential direction of the workpiece positioning plate 201 with the eccentric axis 1021 as a circular center. The workpiece positioning disc 201 and the eccentric inner hole part 100 are positioned and connected through the 3 movable positioning pins 20211 to form a whole, so that the rotating center of the eccentric arc section of the eccentric inner hole part 100 is coincided with the rotating center of the clamp, the eccentric inner hole part 100 is pressed by the pressing pieces which are uniformly distributed relative to the circumference of the eccentric inner hole part 100, the pressing force is uniformly applied to the eccentric inner hole part 100, and the position of the eccentric inner hole part 100 is ensured to be unchanged in the machining process.

Further, the positioning pin 20211 includes the application of force end and the location end of laying along the axial, and the location end includes cylinder section and circular cone section, and the cylinder section is located the one end that the circular cone section is kept away from the application of force end. Understandably, the positioning end sequentially connects the cylindrical section and the conical section along the axial direction of the workpiece positioning disc 201 toward the processing surface, so that the positioning pin 20211 can be inserted into the positioning bushing 20212 through the force application end, and the processing precision of the eccentric arc section of the eccentric inner hole part 100 is ensured, specifically, the positioning end of the positioning pin 20211 and the matching part of the clamp adopt a cylindrical surface, and the matching part of the positioning end and the eccentric inner hole part 100 adopts a conical surface, thereby realizing accurate positioning.

Further, in order to achieve accurate positioning, the positioning pins 20211 and the positioning bushings 20212 are in clearance fit, and since the actual sizes of the holes of the positioning bushings 20212 are inconsistent due to the tolerance of the positioning bushings 20212, each positioning pin 20211 and each positioning bushing 20212 are required to be in one-to-one correspondence, and misalignment is not allowed during assembly. Optionally, the positioning bushing 20212 includes a first positioning hole, a second positioning hole, and a third positioning hole, which are uniformly arranged along a circumferential distance with the part axis 1011 as a circle center line, the mounting surface of the workpiece positioning disk 201 is respectively provided with a first identifier, a second identifier, and a third identifier, the first identifier is arranged corresponding to the first positioning hole, the second identifier is arranged corresponding to the second positioning hole, the third identifier is arranged corresponding to the third positioning hole, and the positioning pin 20211 includes a first positioning pin 20211a in clearance fit with the first positioning hole, a second positioning pin 20211b in clearance fit with the second positioning hole, and a third positioning pin in clearance fit with the third positioning hole. Referring to fig. 5 and 6, it can be understood that numbers 1, 2, and 3 are marked on the processing surface of the workpiece positioning disk 201, where 1 is marked beside the first positioning hole as a first mark, 2 is marked beside the second positioning hole as a second mark, and 3 is marked beside the third positioning hole as a third mark, the force application end of the first positioning pin 20211a is provided with one axial cross section, the force application end of the second positioning pin 20211b is provided with two axial cross sections, and the force application end of the third positioning pin is provided with three axial cross sections, so that the positioning pins 20211 and the positioning holes 20121 are arranged in a one-to-one correspondence manner.

Furthermore, the workpiece positioning plate 201 is further provided with a transportation screw hole, the transportation screw hole is formed in the outer side of the positioning hole 20121, the fastening member 2022 comprises a clamping plate 20221, a fastening unit 20222 and a top bracing bolt 20223, the clamping plate 20221 is fastened on the workpiece positioning plate 201 through the fastening unit 20222 and presses and fixes the part mounting edge of the eccentric inner hole part 100 on the annular boss of the workpiece positioning plate 201, and the top bracing bolt 20223 is arranged in the transportation screw hole to support the clamping plate 20221 and cooperate with the fastening unit 20222 to fix the clamping plate 20221 together. It will be appreciated that, during tightening, the jacking bolts 20223 may be rotated to adjust the distance between the pressure plate and the component mounting edge of the eccentric bore component 100, thereby pressing the eccentric bore component against the mounting surface of the positioning plate 201. Optionally, to prevent the eccentric inner hole part from swinging during machining, the centers of the transportation screw hole and the positioning hole 20121 are aligned and arranged along the radial direction of the eccentric inner hole part. Optionally, the fastening unit 20222 is a fastening bolt.

Preferably, the fastener 2022 further comprises a washer, and the mounting edge of the eccentric female element 100 is fixed between the annular boss and the clamping plate 20221 by the washer.

Further, the workpiece positioning disc 201 is further provided with an assembling hole, the assembling hole is located on a concentric circle with the inner hole central axis 2013 of the alignment circle inner hole 2011 as a circular center line, and the eccentric inner hole part machining clamp further comprises an installation part which is used for penetrating through the assembling hole along the axial direction and installing the workpiece positioning disc 201 on a machine tool.

Further, the alignment circular inner bore 2011 is a through hole. It is understood that in other embodiments, the alignment circular inner bore 2011 may also be a blind bore, and when the alignment circular inner bore 2011 is a blind bore, it may be avoided that the micrometer gauge extends into the machine tool due to excessive force.

Specifically, the operation process of machining the eccentric inner hole part 100 by using the eccentric inner hole part machining jig 200 of the present invention is as follows:

placing the eccentric inner hole part 100 to be processed on the annular boss of the workpiece positioning disc 201, and aligning a part positioning through hole on a part mounting edge of the eccentric inner hole part 100 to be processed with the positioning bushing 20212 on the workpiece positioning disc 201 along the circumferential direction;

correspondingly assembling the positioning bushings 20212 with the same number on the eccentric inner hole part processing clamp by using the positioning pins 20211 with the same number, so that the positioning pins 20211 and the positioning bushings 20212 are correspondingly arranged one by one, and accurately positioning the eccentric inner hole part 100;

the clamp plate 20221 is pressed against the part mounting edge of the eccentric inner hole part 100 and the eccentric inner hole part 100 is tightly pressed and fixed through the fastening unit 20222 and the top bracing bolt 20223;

the inner wall of an alignment circular inner hole 2011 of the workpiece positioning disc 201 faces a dial indicator arranged on a machine tool for zero calibration to obtain a measurement reference, the calibrated dial indicator is used for measuring an eccentric arc section of the eccentric inner hole part 100 to be machined, the jitter value of the eccentric inner hole measured by the dial indicator is compared with the measurement reference to obtain a machining allowance, the eccentric inner hole part 100 rotates by taking an inner hole central axis 2013 as a rotation central line, and the eccentric inner hole part 100 is subjected to cutting machining;

after cutting, the dial gauge mounted on the machine tool is calibrated by the wall surface of the alignment circular inner hole 2011 of the workpiece positioning disc 201, and the calibrated dial gauge is used for measuring the processed circular arc section, so that the position tolerance between the diameter of the eccentric circular arc section and the reference of the eccentric inner hole part 100 can be measured on line.

The invention also provides a processing method of the eccentric inner hole part, and the processing clamp of the eccentric inner hole part comprises the following steps:

positioning and fixing the eccentric inner hole part to be processed on the workpiece positioning disc 201 through a positioning fastener 202;

zero calibration is performed by facing the inner wall of the alignment circular inner hole 2011 on the workpiece positioning disc 201 to a dial indicator arranged on a machine tool, so that a measurement reference is obtained;

moving the dial indicator with the measurement reference from the inner wall surface of the alignment circular inner hole 2011 to the inner wall surface of the eccentric inner hole 102 to be processed, rotating the eccentric inner hole part to be processed to obtain a run-out value of the eccentric inner hole measured by the dial indicator, and comparing the run-out value with the measurement reference to obtain the machining allowance;

and setting the feed amount according to the machining allowance, and enabling the eccentric inner hole part to be machined to rotate along the inner hole central axis 2013 of the alignment circle inner hole 2011 as a rotation central line for machining.

Further, after the machining is finished, the size and the position of the eccentric arc section of the eccentric part are measured on line by a method for determining machining allowance.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.