阅读说明：本技术 一种泵浦接头的双面一体加工夹具及其加工方法 (Double-sided integrated machining clamp and machining method for pump joint ) 是由 黄进兵 陈根 邓芳权 杜芳友 杨永秀 周维学 张爱兰 黄棉春 张红恩 杨自立 于 2021-08-05 设计创作，主要内容包括：本发明公开了泵浦接头加工技术领域的一种泵浦接头的双面一体加工夹具及其加工方法,包括夹具包括：连杆夹爪、圆球夹爪和卡盘,一个所述连杆夹爪、两个圆球夹爪和一个卡盘组成三爪卡盘,能够通过本装置,对泵浦接头的原料进行一次装夹,即可实现两个端面的一起加工完成,确保了两端面的平行度,而且不拆卸接头,将泵浦接头的内孔也一并加工完成,确保了球体内孔轴线与两端面的垂直度；又因为本装置能够卡紧泵浦接头,确保连杆与球体开孔的位置精度,实现工通过车削的方式进行加工,加工精度高,内孔的圆弧也更加平整,孔面精度高,孔径精度也控制更好,因此基于本装置的加工方法既保证了加工精度,又提高了效率。(The invention discloses a double-sided integrated machining clamp of a pump joint and a machining method thereof, belonging to the technical field of pump joint machining, wherein the clamp comprises: the three-jaw chuck is composed of one connecting rod clamping jaw, two spherical clamping jaws and one chuck, the raw materials of the pump joint can be clamped once through the three-jaw chuck, the two end faces can be machined together, the parallelism of the two end faces is ensured, the joint is not disassembled, the inner hole of the pump joint is machined, and the perpendicularity of the axis of the inner hole of the sphere and the two end faces is ensured; the device can clamp the pump joint tightly, so that the position accuracy of the hole opening of the connecting rod and the ball body is ensured, the machining is realized in a turning mode, the machining accuracy is high, the arc of the inner hole is smoother, the hole surface accuracy is high, and the hole diameter accuracy is better controlled, so that the machining method based on the device not only ensures the machining accuracy, but also improves the efficiency.)

1. A double-sided integrated machining clamp of a pumping joint comprises a workpiece, a clamping head and a clamping head, wherein the workpiece comprises a ball body (4) and a connecting rod (43), and the ball body (4) is fixed at one end of the connecting rod (43); it is characterized in that the clamp comprises: the clamp comprises connecting rod clamping jaws (1), spherical clamping jaws (2) and a chuck (3), wherein the three-jaw chuck is formed by one connecting rod clamping jaw (1), two spherical clamping jaws (2) and one chuck (3);

a clamping table (21) is arranged on the inner side of the connecting rod clamping jaw (1), a concave spherical clamping groove (22) is arranged on the inner side of the clamping table (21), the clamping groove (22) is formed in one end of the top of the clamping table (21), and an avoiding groove (23) is arranged right below the clamping groove (22);

an erection table (11) is arranged on the inner side of the spherical ball clamping jaw (2), a limiting groove (12) is formed in the top of the erection table (11), and an independent avoidance groove (23) is formed under the limiting groove (12);

the sphere (4) of the workpiece can be separately erected in the clamping grooves (22) of the two spherical clamping jaws (2), the connecting rod (43) of the workpiece can be separately erected in the limiting groove (12), and the limiting groove (12) and the two clamping grooves (22) can be loosened to clamp and abut against the outside of the sphere (4) and the connecting rod (43) of the workpiece.

2. The double-sided integrated machining fixture for the pump joint as claimed in claim 1, wherein: the limiting groove (12) is a long-strip-shaped open groove, the bottom of the limiting groove (12) is arc-shaped, the limiting groove (12) and the connecting rod (43) are in clearance fit, the clearance is not more than 0.1mm, and the length m of the limiting groove (12) is the same as the length c of the connecting rod (43).

3. The double-sided integrated machining fixture for the pump joint as claimed in claim 1, wherein: the spherical surface diameter of the clamping groove (22) is the same as the diameter of the ball body (4).

4. The double-sided integrated machining fixture for the pump joint as claimed in claim 1, wherein: the avoiding groove (23) is an annular groove, and the plane of the annular cambered surface of the avoiding groove (23) is parallel to the plane of the top of the chuck (3);

two dodge groove (23) have all been seted up on ball clamping jaw (2) and a connecting rod clamping jaw (1), three dodge groove (23) and constitute even discontinuous annular structure, the cyclic annular diameter of dodging groove (23) constitution is greater than the maximum length that the blade stretches out.

5. The double-sided integrated machining fixture for the pump joint as claimed in claim 1, wherein: the height h of the clamping table (21) is the same as the height b of the erecting table (11), and the sum of the maximum length of the blade of the cutter and the diameter of the workpiece sphere is smaller than the height h.

6. A double-sided integrated processing method of a pumping joint is characterized in that: the processing method is to provide a double-sided integrated processing clamp of the pump joint, which is disclosed in the claims 1-5, and the processing method comprises the following steps:

step 1, aligning one side of a sphere (4) of a pumping joint to the direction of two spherical clamping jaws (2), aligning a connecting rod (43) of the pumping joint to the direction of the connecting rod clamping jaw (1), horizontally placing the pumping joint on a chuck (3) of a machine tool, and enabling the pumping joint to be positioned at the corresponding height of an erection table (11) and a clamping table (21);

step 2, controlling the connecting rod clamping jaws (1) and the two spherical clamping jaws (2) to slide and fold through a chuck (3) of the machine tool to clamp the pump joint, fitting clamping grooves (22) of the two spherical clamping jaws (2) with the spherical surface of a sphere (4), and sleeving a limiting groove (12) of one connecting rod clamping jaw (1) to abut against the outer end of a connecting rod (43);

step 3, turning a turning tool aiming at the ball body (4) of the pumping joint, flattening the spherical surface outside the ball body 4 to form an outer side end surface (42), then drilling the inner hole of the ball body (4) by using a drill bit, and drilling the position of the inner hole of the whole ball body (4) completely;

step 4, replacing the turning tool, enabling the tool nose to face the hole wall of the inner hole of the sphere (4), turning the inner hole wall of the sphere (4), and machining an arc-shaped inner hole arc (41);

step 5, replacing the turning tool again, enabling the tool nose to face the upper part and the circumferential direction of the chuck (3), extending the turning tool into an inner hole of the sphere (4), penetrating the sphere (4) and extending into a gap between a clamping table (21) of the two spherical clamping jaws (2) and an erection table (11) of the connecting rod clamping jaw (1), turning the spherical surface on the inner side of the sphere (4), and turning and flattening the end surface (42) on the inner side of the sphere (4);

and 6, controlling the turning tool to withdraw the pumping joint from the inner hole of the ball body (4), loosening the connecting rod clamping jaw (1) and the two ball clamping jaws (2) through a chuck (3) of the machine tool after stopping the machine, and taking out the machined pumping joint.

Technical Field

The invention relates to the technical field of pump joint machining, in particular to a double-sided integrated machining clamp of a pump joint and a machining method of the double-sided integrated machining clamp.

Background

The pumping connects the overall structure that is a spheroid column concatenation, and one end is the spheroid other end for the cylinder connecting rod, and the spheroid is connected in cylinder connecting rod one end to the inside of cylinder connecting rod have with spheroid internal connection's pipeline, based on spheroidal characteristic, make the angle that this device can the conversion pipe connection, thereby conveniently be used for the pipe connection that needs the change angle, this kind of joint is often used for among the pipe connection of dynamic device.

The oil injection joint of the piston of the engine needs a pumping joint, and belongs to a common device for pipeline connection. In the engine oil passage, if a leak occurs at the joint, there is a great risk, and therefore, the manufacturing accuracy of the pump joint is required to be high in the case where high-reliability connection of the engine is required. In order to ensure the high reliable connection sealing performance of the pumping joint, the shape and position precision of the pumping joint during processing are controlled to be good, for example, the parallelism of two end faces of a sphere, the perpendicularity of the axis of an inner hole of the sphere and the section of the sphere, the size of the aperture, the position degree of the axis of an inner hole of the sphere and the axis of a cylindrical pipeline and the like have high requirements.

At present, the processing of pump joint, carry out the centre gripping with general anchor clamps of spheroid generally, then the cutting exposes the one side outside anchor clamps, the reuse drill bit is driped a hole to the spheroid, the less lathe tool of reuse carries out the processing of downthehole arc to the spheroid, it carries out the centre gripping to take off the pump joint one side of changing next, expose the one side that the spheroid was not processed outside anchor clamps, this one side of reprocess, such operation, need carry out a lot of clamping with different anchor clamps on different equipment, complex operation not only, and the depth of parallelism of two terminal surfaces of spheroid can't be guaranteed, also can't guarantee the position relation of trompil in connecting rod and the spheroid, thereby can't guarantee the precision. In addition, the existing hole opening mode of the inner hole of the sphere is that a drilling tool is used for drilling, the axial line position of the sphere is difficult to control, the hole expanding and reaming after the drill bit is used for drilling can only improve the size precision and can not improve the position precision of the hole, the size precision of the hole can be ensured and the position precision of the hole can also be improved through turning, and the pump joint standard of an oil way of an automobile engine can be achieved. In a word, the traditional processing mode has the disadvantages of complex operation, difficult precision control, and low qualification rate and efficiency.

Based on the above, the invention designs a double-sided integrated machining clamp of a pump joint and a machining method thereof, so as to solve the problems.

Disclosure of Invention

The invention aims to provide a double-sided integrated machining clamp of a pump joint and a machining method thereof, which can realize the machining of two end faces together by clamping the raw materials of the pump joint once through the device, ensure the parallelism of the two end faces, complete the machining of an inner hole of the pump joint without disassembling the joint, complete the machining of the inner hole of the pump joint, and ensure the perpendicularity of the axis of the inner hole of a sphere and the two end faces; the device can clamp the pump joint tightly, so that the position accuracy of the hole opening of the connecting rod and the ball body is ensured, the workpiece is machined in a turning mode, the machining accuracy and the machining efficiency are high, the arc of the inner hole is smoother, the hole surface accuracy is high, and the adjustment and the control of the hole diameter accuracy are more convenient.

The invention is realized by the following steps: a double-sided integrated machining clamp of a pumping joint comprises:

the workpiece comprises a ball body and a connecting rod, and the ball body is fixed at one end of the connecting rod; the clamp includes: the three-jaw chuck comprises connecting rod clamping jaws, spherical ball clamping jaws and a chuck, wherein the three-jaw chuck consists of one connecting rod clamping jaw, two spherical ball clamping jaws and one chuck;

the connecting rod clamping jaw is characterized in that a clamping table is arranged on the inner side of the connecting rod clamping jaw, a sunken spherical clamping groove is formed in the inner side of the clamping table, the clamping groove is formed in one end of the top of the clamping table, and an avoiding groove is formed in the position, right below the clamping groove, of the clamping table

An erection table is arranged on the inner side of the spherical clamping jaw, a limiting groove is formed in the top of the erection table, and an independent avoidance groove is formed under the limiting groove;

the sphere of work piece can be separated erect in the centre gripping inslot of two ball clamping jaws, the work piece the connecting rod can be separated erect in the spacing inslot, the clamp that spacing groove and two centre gripping grooves can loosen is supported and is leaned on outside at the sphere and the connecting rod of work piece.

Further, the limiting groove is a long-strip-shaped open groove, the bottom of the limiting groove is arc-shaped, the limiting groove and the connecting rod are in clearance fit, the clearance is not more than 0.1mm, and the length m of the limiting groove is the same as the length c of the connecting rod.

Further, the spherical diameter of the clamping groove is the same as the diameter of the ball.

Furthermore, the avoiding groove is an annular groove, and the plane of the annular cambered surface of the avoiding groove is parallel to the plane of the top of the chuck;

avoidance grooves are formed in the two spherical clamping jaws and the connecting rod clamping jaw, the three avoidance grooves form an evenly-interrupted annular structure, and the annular diameter formed by the avoidance grooves is larger than the maximum length of the blade.

Further, the height h of the clamping table is the same as the height b of the erecting table, and the sum of the maximum blade length of the cutter and the diameter of the workpiece sphere is smaller than the height h.

A double-sided integrated processing method of a pump joint needs to provide a double-sided integrated processing clamp of the pump joint, and the processing method comprises the following steps:

step 1, aligning one side of a ball body of a pumping joint to the direction of two ball clamping jaws, aligning a connecting rod of the pumping joint to the direction of a connecting rod clamping jaw, horizontally placing the pumping joint on a chuck of a machine tool, and enabling the pumping joint to be at the corresponding height of an erection table and a clamping table;

step 2, controlling the connecting rod clamping jaw and the two spherical clamping jaws to slide and fold through a chuck of the machine tool, clamping the pump joint, fitting clamping grooves of the two spherical clamping jaws with the spherical surface of a sphere, and sleeving a limiting groove of one connecting rod clamping jaw to abut against the outer end of the connecting rod;

step 3, turning a turning tool aiming at the ball body of the pumping joint, flattening the spherical surface outside the ball body 4 to form an outer end surface, then replacing the turning tool with a drill bit to drill the inner hole of the ball body, and drilling the position of the inner hole of the whole ball body completely;

step 4, replacing the turning tool, enabling the tool nose to face the wall of the inner hole of the sphere, turning the wall of the inner hole of the sphere, and machining an arc-shaped inner arc of the hole;

step 5, replacing the turning tool again to enable the tool point to face the upper part of the chuck and the circumferential direction, extending the turning tool into an inner hole of the sphere, penetrating the sphere to extend into a gap between a clamping table of the two spherical clamping jaws and an erection table of the connecting rod clamping jaw, turning the spherical surface on the inner side of the sphere, and turning the end surface on the inner side of the sphere to be flat;

and 6, controlling the turning tool to withdraw from the pumping joint from the inner hole of the sphere, loosening the connecting rod clamping jaw and the two spherical clamping jaws through a chuck of the machine tool after the machine tool is stopped, and taking out the machined pumping joint.

The invention has the beneficial effects that: 1. the pump joint is clamped by the integral structure of the three-jaw chuck in parallel to the chuck surface, so that the pump joint can be horizontally placed and clamped in the connecting rod clamping jaw and the ball clamping jaw, and the pump joint clamped by the device can be machined in a turning mode, and the equipment cost is reduced;

2. the device has the advantages that through the connection rod clamping jaw and the avoidance groove in the ball clamping jaw, after the device is clamped for one time, the turning tool can go deep into the clamping jaw to perform turning processing on the other hole surface, the whole pumping joint can complete ball body opening, two end surface turning processing and processing of an inner hole arc at one time without disassembling and assembling the pumping joint, a plurality of disassembling and assembling steps are omitted, parallelism of two end surfaces and perpendicularity of a hole axis and the two end surfaces can be guaranteed, product quality is effectively guaranteed, and processing efficiency can be greatly improved;

3. the clamping mode that the central axis of the pump joint is parallel to the chuck ensures that the position relation between the connecting rod and the ball body of the device can be stable during clamping, so that the position of the hole of the pump joint is kept accurate to the connecting rod, the vertical intersection of the axis of the hole in the ball body and the axis of the connecting rod can be ensured, and the accuracy of the hole position is ensured;

4. the processing of the inner slotted hole on the lathe after drilling and the adjustment of the hole size are very convenient, and the problems of the traditional drilling and milling that the fine processing of the hole size and the size adjustment are difficult are effectively avoided.

Drawings

The invention will be further described with reference to the following examples with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a pump connector material holding structure according to the present invention;

FIG. 2 is a schematic view of the overall structure of the present invention;

FIG. 3 is a top view of the present invention holding the pump head feedstock;

FIG. 4 is an overall top view of the present invention;

FIG. 5 is a schematic view of a connecting rod clamping jaw structure of the present invention;

FIG. 6 is a schematic view of a spherical clamping jaw according to the present invention;

FIG. 7 is a schematic view of a finished pump connector of the present invention;

FIG. 8 is a schematic view of the raw material structure of the pump connector of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1-connecting rod clamping jaw, 11-erecting table, 12-limiting groove, 2-ball clamping jaw, 21-clamping table, 22-clamping groove, 23-avoiding groove, 3-clamping disc, 4-ball, 41-hole inner arc, 42-end face and 43-connecting rod.

Detailed Description

Referring to fig. 1 to 8, the present invention provides a technical solution: a double-sided integrated machining clamp of a pumping joint comprises:

the workpiece comprises a ball 4 and a connecting rod 43, wherein the ball 4 is fixed at one end of the connecting rod 43; the clamp includes: the three-jaw chuck comprises connecting rod clamping jaws 1, spherical clamping jaws 2 and a chuck 3, wherein the three-jaw chuck is formed by one connecting rod clamping jaw 1, two spherical clamping jaws 2 and one chuck 3;

connecting rod clamping jaw 1 inboard is equipped with centre gripping platform 21, the inboard of centre gripping platform 21 is equipped with sunken sphere centre gripping groove 22, centre gripping groove 22 is seted up in the top one end of centre gripping platform 21, be equipped with one under the centre gripping groove 22 and dodge groove 23

An erection table 11 is arranged on the inner side of the spherical ball clamping jaw 2, a limiting groove 12 is formed in the top of the erection table 11, and an independent avoiding groove 23 is formed right below the limiting groove 12;

the sphere 4 of the workpiece can be separately erected in the clamping grooves 22 of the two spherical clamping jaws 2, the connecting rod 43 of the workpiece can be separately erected in the limiting groove 12, the limiting groove 12 and the two clamping grooves 22 can be loosened and clamped to abut against the sphere 4 and the connecting rod 43 of the workpiece, the raw material of the pump joint can be clamped once through the device, the two end faces 42 can be processed together, the joint is not disassembled, the inner hole of the pump joint is processed together, the axis accuracy of the inner hole of the sphere 4 is ensured, the device is processed in a turning mode, the processing accuracy is high, the inner hole arc 41 of the inner hole is more smooth, the hole face accuracy is high, the hole diameter accuracy is better controlled, the end faces 42 on two sides of the inner hole of the two spheres 4 are ensured to be parallel to each other, the device flatly puts the sphere 4 and the connecting rod 43 of the pump joint on a chuck of a machine tool, thereby can the chucking pump connect, ensure the relative position precision between connecting rod 43 and the spheroid 4 trompil, so this device processing has both guaranteed the machining precision, has improved efficiency again.

The limiting groove 12 is a long-strip-shaped open groove, the bottom of the limiting groove 12 is arc-shaped, the limiting groove 12 is in clearance fit with the connecting rod 43, the clearance is not more than 0.1mm, the length m of the limiting groove 12 is the same as the length c of the connecting rod 43, so that the limiting groove 12 can stably clamp the connecting rod 43 and the clamping stability is ensured;

the spherical surface diameter of the clamping groove 22 is the same as that of the ball 4, so that the ball 4 can be stably clamped during clamping;

the avoiding groove 23 is an annular groove, and the plane of the annular cambered surface of the avoiding groove 23 is parallel to the plane of the top of the chuck 3;

avoidance grooves 23 are formed in the two spherical ball clamping jaws 2 and the connecting rod clamping jaw 1, the three avoidance grooves 23 form an even and discontinuous annular structure, the annular diameter formed by the avoidance grooves 23 is larger than the maximum length of a blade, the whole pump joint can be clamped above the chuck 3 in parallel, the clamping is stable, and meanwhile the avoidance grooves 23 can not interfere with the cutting of a turning tool, so that the device can process two end faces 42 of the sphere 4 by clamping once, the coaxiality of the two end faces 42 of an inner hole of the sphere 4 is ensured, the processing precision is higher, repeated clamping is not needed, and the processing efficiency is higher;

the height h of the clamping table 21 is the same as the height b of the erection table 11, the sum of the maximum blade length of the cutter and the diameter of a workpiece sphere is smaller than the height h, when clamping is ensured, the turning tool can also process the inner side end face 42 of the sphere 4, the turning tool extends into a gap between the clamping table 21 and the erection table 11, the rotation of the chuck 3 cannot be interfered, the height h is high enough, and the turning tool cannot be influenced by the chuck 3.

A double-sided integrated processing method of a pump joint needs to provide a double-sided integrated processing clamp of the pump joint, and the processing method comprises the following steps:

step 1, aligning one side of a ball 4 of a pumping joint to the direction of two ball clamping jaws 2, aligning a connecting rod 43 of the pumping joint to the direction of a connecting rod clamping jaw 1, horizontally placing the pumping joint on a chuck 3 of a machine tool, and enabling the pumping joint to be positioned at the corresponding height of an erection table 11 and a clamping table 21;

step 2, controlling the connecting rod clamping jaw 1 and the two spherical clamping jaws 2 to slide and fold through a chuck 3 of the machine tool, clamping the pump joint, fitting the clamping grooves 22 of the two spherical clamping jaws 2 with the spherical surface of the sphere 4, and sleeving the limiting groove 12 of one connecting rod clamping jaw 1 to abut against the outer end of the connecting rod 43;

step 3, turning the sphere 4 of the pump joint by aligning a turning tool, flattening the spherical surface outside the sphere 4 to form an outer end surface 42, drilling the inner hole of the sphere 4 by replacing the turning tool with a drill, and drilling the inner hole of the whole sphere 4 completely;

step 4, replacing the turning tool, enabling the tool nose to face the hole wall of the inner hole of the sphere 4, turning the inner hole wall of the sphere 4, and machining an arc-shaped inner hole inner arc 41;

step 5, replacing the turning tool again to enable the tool tip to face the upper part and the circumferential direction of the chuck 3, extending the turning tool into an inner hole of the sphere 4, penetrating the sphere 4 and extending into a gap between the clamping tables 21 of the two spherical clamping jaws 2 and the erecting table 11 of the connecting rod clamping jaw 1, turning the spherical surface on the inner side of the sphere 4, and turning and leveling the end surface 42 on the inner side of the sphere 4;

and 6, controlling the turning tool to withdraw the pumping joint from the inner hole of the ball body 4, loosening the connecting rod clamping jaw 1 and the two ball clamping jaws 2 through the chuck 3 of the machine tool after the machine tool is stopped, and taking out the machined pumping joint.

In one embodiment of the invention:

the embodiment of the invention provides a double-sided integrated processing clamp of a pump joint and a processing method thereof, and solves the technical problems that: processing of present pump joint is accomplished on the machining center, need carry out the centre gripping with spheroid 4 with general anchor clamps, then the cutting exposes the one side outside anchor clamps, reuse drill bit drills spheroid 4, the processing of downthehole arc 41 is carried out spheroid 4 to the less milling cutter of reuse, next take off the pump joint and change the work piece one side again and carry out the centre gripping through special fixture, expose the not processed one side of spheroid 4 outside anchor clamps, this one side of reprocess, such operation, not only complex operation, and can't guarantee the depth of parallelism of two terminal surfaces 42 of spheroid 4, also can't guarantee the positional relation of trompil in connecting rod 43 and the spheroid 4, and the straightness that hangs down of hole axis and two faces. In addition, after the hole is drilled on the milling machine, the hole size is inconvenient to finish, the turning precision is not as high, and the pump joint standard of the oil way of the automobile engine is difficult to achieve, so the operation of the machining mode is difficult, and the qualification rate is not high.

The realized technical effects are as follows: 1. the pump joint is clamped by the integral structure of the three-jaw chuck in a manner of being parallel to the surface of the chuck 3, so that the pump joint can be horizontally placed and clamped in the connecting rod clamping jaw 1 and the ball clamping jaw 2, and the pump joint clamped by the device can be machined in a turning manner, thereby effectively reducing the equipment cost;

2. this device passes through connecting rod clamping jaw 1 and ball clamping jaw 2 interior on dodge groove 23, make this device once the centre gripping after, the lathe tool can go deep into to carry out the operation of cutting flat of another terminal surface 42 of hole on the spheroid 4 in the clamping jaw, needn't dismouting pumping joint just can once only accomplish the 4 trompils of spheroid that whole pumping connects, two terminal surfaces 42 turn and level and the processing of downthehole arc 41, the depth of parallelism of two terminal surfaces has effectively been guaranteed, and the straightness that hangs down of processing hole axis and both ends face, and saved a plurality of dismouting steps, and the processing quality and efficiency are improved.

3. The device horizontally places the ball 4 and the connecting rod 43 of the pumping joint on the chuck 3 for clamping, so that the position relation between the connecting rod 43 and the ball 4 of the device can be ensured to be stable during clamping by a clamping mode that the central axis of the pumping joint is parallel to the chuck 3, the position between the tapping position of the pumping joint and the connecting rod 43 can be ensured to be accurate, the vertical intersection of the axis of the tapping in the ball 4 and the axis of the connecting rod 43 can be ensured, and the axis position of the tapping is ensured to be accurate;

4. the workpiece is processed into the inner slotted hole on the lathe after drilling, the secondary adjustment and processing of the hole size are very convenient, the processing precision of the hole can be ensured, and the problem of difficult finish machining and adjustment of the traditional milling hole size is effectively solved.

In order to solve the above problems, the technical solution in the embodiments of the present invention has the following general idea:

for better understanding of the above technical solutions, the following detailed descriptions will be provided in conjunction with the drawings and the detailed description of the embodiments.

When the universal three-jaw chuck is manufactured, a common three-jaw chuck is taken as the chuck 3, then one clamping jaw of the common chuck 3 is taken as the connecting rod clamping jaw 1, two clamping jaws are taken as the round ball clamping jaws 2, a longer erection table 11 is required to be arranged on one clamping side of each connecting rod clamping jaw 1, a higher clamping table 21 is required to be arranged on one clamping side of the same round ball clamping jaw 2, the height b of the erection table 11 is the same as the height h of the clamping table 21, and the height b and the height h are larger than the depth required by the processing of a turning tool, so that the maximum depth of the turning tool in the processing process is ensured not to be mutually interfered with the chuck 3;

the top of the clamping surface of the erection table 11 of the connecting rod clamping jaw 1 is provided with a limiting groove 12, the length m of the limiting groove 12 is the same as the length c of a connecting rod 43 of a pump joint to be processed, the error is not more than 0.05mm, the width n of the limiting groove 12 is in clearance fit with the connecting rod, the clearance is not more than 0.05mm,

then, a clamping surface of a clamping table 21 of the two spherical clamping jaws 2 is manufactured, a clamping groove 22 is formed in the top of the clamping surface of the clamping table 21, the clamping groove 22 is of a partially spherical structure, the clamping groove 22 is recessed towards the inside of the clamping table 21, the spherical diameter of the clamping groove 22 is the same as that of a sphere 4 of the pump joint, an avoiding groove 23 is formed below the clamping groove 22 of each spherical clamping jaw 2, the avoiding groove 23 is an annular arc, the diameter of the annular end face of the avoiding groove 23 is parallel to the chuck 3, the diameter of the annular face of the avoiding groove 23 is larger than the maximum cutting diameter of a turning tool, the clamping table 21 and the turning tool are ensured not to interfere with each other, and one connecting rod clamping jaw 1 and the two spherical clamping jaws 2 are clamped relatively to form the complete three-jaw chuck shown in fig. 2.

When the device is used, raw materials of the whole pumping joint are placed into the whole clamp as shown in figure 8, a ball 4 of the pumping joint is placed at a clamping groove 22 of an aligning spherical clamping jaw 2, a connecting rod 43 is placed at a limiting groove 12 of the aligning connecting rod clamping jaw 1, a chuck 3 is controlled to enable the connecting rod clamping jaw 1 and the two spherical clamping jaws 2 to begin to be folded and clamped towards the circle center, an erection table 11 and a clamping table 21 are close to each other, the clamping groove 22 is aligned with the spherical surface of the ball 4, the limiting groove 12 is aligned with the connecting rod 43 to be folded and clamped, and the clamping is shown in figure 1 after clamping, the projection of the axis of the whole pumping joint formed by the connecting rod 43 and the ball 4 on the chuck 3 is coincided with the diameter of the chuck 3, the axis of the pumping joint is parallel to the chuck and is positioned right above the chuck 3, when the device is processed, the chuck 3 is arranged vertical to a reference plane of a machine tool, and the figure is only convenient for showing angles, the outer side end face of the pump joint is machined through a lathe tool of a machine tool instead of the machining angle, the outer side end face 42 is turned, the turning precision is high, the flatness is high, then, the ball body 4 is opened, the inner arc 41 of the ball body is turned after the opening, the chuck 3 rotates during the turning, the precision of the turning tool is easier to control, and the chamfer can be directly performed through the turning tool after the drilling is finished, then the inner hole of the whole sphere 4 is turned continuously to lead the two surfaces of the sphere 4 to penetrate, the turning tool extends into a gap enclosed between the erection table 11 and the clamping table 21, the turning tool starts turning the inner side of the sphere 4 held close to the chuck 3, the inner side end face 42 of the sphere 4 is also turned, and then after the machining is finished, the lathe controls the turning tool to withdraw from the sphere 4, the machining is finished, and the connecting rod clamping jaw 1 and the spherical ball clamping jaw 2 loosen the machined pumping joint.

The inner sides of the connecting rod clamping jaw 1 and the spherical clamping jaw 2 are the sides close to the circle center of the chuck 3, namely one side of the clamping surface is the inner side, and the outer side is the side of the circumference of the circular chuck 3; the top of the connecting rod clamping jaw 1 and the top of the spherical clamping jaw 2 are the ends far away from the chuck 3, as shown in fig. 2, and the ends close to the chuck 3 are the lower parts or the bottoms.

In addition, in the description of the present invention, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "rear", etc. appear, their indicated orientations or positional relationships are based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Although specific embodiments of the invention have been described above, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the appended claims.