阅读说明：本技术 一种机床及其自定心中心架 (Machine tool and self-centering center frame thereof ) 是由 赵恒宇 赵守彪 王铁彪 周建光 于 2019-12-11 设计创作，主要内容包括：本发明提出了一种自定心中心架,包括用于与机床固定连接的安装座、设于安装座的三爪卡盘,所述三爪卡盘的第一分离爪设有上夹紧臂、第二分离爪设有中夹紧臂、第三分离爪设有下夹紧臂,所述三爪卡盘的第一分离爪、第二分离爪、第三分离爪间隔120°分布且运动速度相同,用以解决降低自定心中心架体积、提高可靠性的技术问题。(The invention provides a self-centering center frame which comprises a mounting seat and a three-jaw chuck, wherein the mounting seat is used for being fixedly connected with a machine tool, the three-jaw chuck is arranged on the mounting seat, a first separating jaw of the three-jaw chuck is provided with an upper clamping arm, a second separating jaw of the three-jaw chuck is provided with a middle clamping arm, a third separating jaw of the three-jaw chuck is provided with a lower clamping arm, and the first separating jaw, the second separating jaw and the third separating jaw of the three-jaw chuck are distributed at intervals of 120 degrees and have the same moving speed, so that the technical problems of reducing the volume of the self-centering center frame and improving the reliability.)

1. The utility model provides a from centering centre frame, is including being used for with lathe fixed connection's mount pad, the three-jaw chuck of locating the mount pad, its characterized in that, the first separation claw of three-jaw chuck is equipped with and presss from both sides tight arm, second separation claw and is equipped with well clamp arm, third separation claw and is equipped with down and presss from both sides tight arm, the first separation claw, second separation claw, third separation claw interval 120 of three-jaw chuck distribute and the velocity of motion is the same.

2. The self-centering steady rest according to claim 1, wherein said mounting seat is provided with front and rear guide plates engaged with each other, and engaged with each other to form respective guide grooves for guiding the movement of the upper, middle and lower clamp arms, respectively.

3. The self-centering steady rest according to claim 2, characterized in that the upper clamping arm and the lower clamping arm are provided with a fine adjustment eccentric sleeve, the fine adjustment eccentric sleeve comprises a rotating shaft bolt respectively penetrating the upper clamping arm and the lower clamping arm, the rotating shaft bolt is provided with a rotating platform, the central axis of the rotating platform deviates from the central axis of the bolt, the rotating platform sleeve is provided with a supporting wheel for supporting the surface of the part to be processed, the rotating shaft bolt is provided with a conical opening, the conical opening is provided with an opening seam, the rotating shaft bolt is provided with a conical sleeve in a matching manner, and a pushing bolt for pushing the conical sleeve to move towards the inner side of the conical opening is connected with the rotating shaft bolt through the conical sleeve in a threaded manner.

4. The self-centering steady rest as claimed in claim 3, wherein the upper clamping arm comprises a base arm fixed to the first separating claw, and a front arm hinged to the base arm, and the base arm and the front arm are provided with a pluggable pin so as to be relatively fixed.

5. The self-centering steady rest according to claim 4, wherein the upper clamping arm, the middle clamping arm and the lower clamping arm are provided with cross-shaped keys, the first separating claw, the second separating claw and the third separating claw are provided with key slots which are matched with the corresponding cross-shaped keys, and the cross-shaped keys are in interference fit with the key slots.

6. The self-centering steady rest of claim 5, wherein said support wheels are provided on the outside with a guard for avoiding swarf from being caught between the workpiece and the support wheels.

7. The self-centering steady rest of claim 6, wherein said front guide plate is provided with a locking bolt to lock the position of the front guide plate with at least one of the upper clamp arm, the middle clamp arm, and the lower clamp arm.

8. The self-centering steady rest of claim 7, wherein at least one of said upper clamp arm, said middle clamp arm, and said lower clamp arm is provided with a coolant spray device for cooling said support wheel and said workpiece surface.

9. The self-centering steady rest of claim 8, wherein said support wheels are bearings.

10. A machine tool comprising a self-centering steady rest as claimed in any one of claims 1 to 9.

Technical Field

The invention relates to a machine tool and a self-centering center frame thereof.

Background

When the excircle of the shaft part is machined, the shaft part is easy to axially jump, so that machining errors are generated, and the influence of the jumping on machining is reduced by the center frame.

At present, only a few domestic high-end machine tools of enterprises are provided with a self-centering center frame, and the self-centering center frame is mostly a hydraulic self-centering center frame imported from abroad, so that the self-centering center frame is large in size, low in reliability and low in cost performance. Therefore, a self-centering center frame with compact mechanism and higher reliability is urgently needed in the market.

Disclosure of Invention

The invention provides a self-centering center frame, which aims to solve the technical problems of reducing the volume of the self-centering center frame and improving the reliability.

The technical scheme of the invention is realized as follows: the utility model provides a from centering centre frame, is including being used for with lathe fixed connection's mount pad, the three-jaw chuck of locating the mount pad, the first separation claw of three-jaw chuck is equipped with and presss from both sides tight arm, second separation claw and is equipped with well clamp arm, third separation claw and is equipped with down and press from both sides tight arm, the first separation claw, second separation claw, third separation claw interval 120 of three-jaw chuck distribute and the velocity of motion is the same.

Furthermore, the mounting seat is provided with a front guide plate and a rear guide plate which are mutually buckled, and the front guide plate and the rear guide plate are buckled to form corresponding guide grooves which respectively enable the upper clamping arm, the middle clamping arm and the lower clamping arm to move in a guiding mode.

Further, go up the clamp arm, press from both sides the clamp arm down and be equipped with the eccentric cover of micro-adjustment, the eccentric cover of micro-adjustment is including wearing to locate the pivot bolt of last clamp arm, lower clamp arm respectively, the pivot bolt is equipped with rotary platform, rotary platform's the central axis of the skew bolt of the central axis, the rotary platform cover is equipped with and is used for supporting the supporting wheel of waiting to process the part surface, the pivot bolt is equipped with the toper opening, the toper opening is equipped with the opening seam, be equipped with the toper cover with the cooperation of toper opening, it has the top of being used for pushing up the toper cover to the inboard top bolt of motion of toper opening to pass toper cover and pivot bolt threaded connection.

Furthermore, go up the clamp arm including the root arm that is fixed in first separation claw, with root arm articulated forearm, but root arm and forearm are worn to be equipped with plug round pin axle so that both relatively fixed.

Further, go up clamping arm, well clamping arm, lower clamping arm and be equipped with the cross key, first separation claw, second separation claw, third separation claw are equipped with the keyway with corresponding cross key complex, cross key and keyway interference fit.

Furthermore, a protective sheet for preventing the cutting scraps from being drawn between the workpiece and the supporting wheel is arranged on the outer side of the supporting wheel.

Further, the front guide plate is provided with a locking bolt to lock the position of the front guide plate and at least one of the upper clamping arm, the middle clamping arm and the lower clamping arm.

Furthermore, at least one of the upper clamping arm, the middle clamping arm and the lower clamping arm is provided with a cooling liquid spraying device for cooling the supporting wheel and the surface of the workpiece.

Further, the supporting wheel is a bearing.

The invention also provides a machine tool, which comprises the self-centering center frame.

By adopting the technical scheme, the invention has the beneficial effects that: the self-centering center frame adopts the upper clamping arm, the middle clamping arm and the lower clamping arm which follow three jaws of the three-jaw chuck, and the circle centers determined by the upper clamping arm, the middle clamping arm and the lower clamping arm are not changed (three-point circle, the circle center is not changed, the diameter is changed) because the first separating jaw, the second separating jaw and the third separating jaw of the three-jaw chuck are distributed at an interval of 120 degrees, so that the self-centering of the center frame when clamping shaft parts is realized; the self-centering center frame is skillfully designed by utilizing the structure of the three-jaw chuck, and the whole volume is smaller; the three-jaw chuck is a mature prior art, so the design is carried out on the basis of the three-jaw chuck, and the reliability of the self-centering center frame is enhanced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural view of a self-centering steady rest according to the present invention;

FIG. 2 is a schematic view of another angle of the self-centering steady rest according to the present invention;

FIG. 3 is a schematic view of the front and rear guide plates of the present invention in a separated configuration;

FIG. 4 is a cross-sectional view of a micro-adjustment eccentric bushing of the present invention;

FIG. 5 is a schematic view of a spindle bolt according to the present invention;

FIG. 6 is a schematic view of the clamping action of the self-centering steady rest of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

An embodiment 1 of a self-centering center frame is shown in fig. 1-4 and comprises a mounting base 1 fixedly connected with a machine tool and a three-jaw chuck 2 arranged on the mounting base, wherein a first separating jaw of the three-jaw chuck is provided with an upper clamping arm 4, a second separating jaw is provided with a middle clamping arm 6, a third separating jaw is provided with a lower clamping arm 8, and the first separating jaw, the second separating jaw and the third separating jaw of the three-jaw chuck are distributed at an interval of 120 degrees and have the same moving speed.

An embodiment 2 of a self-centering center frame is shown in fig. 1-4 and comprises a mounting base 1 and a three-jaw chuck 2, wherein the mounting base 1 is used for being fixedly connected with a machine tool, the three-jaw chuck 2 is arranged on the mounting base, a first separating jaw of the three-jaw chuck is provided with an upper clamping arm 4, a second separating jaw of the three-jaw chuck is provided with a middle clamping arm 6, a third separating jaw of the three-jaw chuck is provided with a lower clamping arm 8, the first separating jaw, the second separating jaw and the third separating jaw of the three-jaw chuck are distributed at intervals of 120 degrees and have the same movement speed, the mounting base is provided with a front guide plate 9 and a rear guide plate 10 which are mutually buckled, and the front guide plate and the rear guide plate are buckled to form corresponding guide grooves 11 which respectively enable the upper.

A self-centering center frame embodiment 3 is shown in figures 1-4 and comprises a mounting base 1 fixedly connected with a machine tool and a three-jaw chuck 2 arranged on the mounting base, wherein a first separating jaw of the three-jaw chuck is provided with an upper clamping arm 4, a second separating jaw is provided with a middle clamping arm 6, a third separating jaw is provided with a lower clamping arm 8, the first separating jaw, the second separating jaw and the third separating jaw of the three-jaw chuck are distributed at intervals of 120 degrees and have the same movement speed, the mounting base is provided with a front guide plate 9 and a rear guide plate 10 which are mutually buckled, the front guide plate and the rear guide plate are buckled to form corresponding guide grooves 11 respectively leading the upper clamping arm, the middle clamping arm and the lower clamping arm to move, the upper clamping arm and the lower clamping arm are provided with micro-adjustment eccentric sleeves, each micro-adjustment eccentric sleeve comprises a rotating shaft bolt 12 respectively penetrating through the upper clamping arm and the lower clamping arm, each rotating shaft bolt is provided with a rotating platform 13, and the central axis of each rotating platform deviates from the central axis of the bolt so as to rotate when the The position of the central axis of the platform, the rotating platform is sleeved with a supporting wheel 14 used for supporting the surface of a part to be processed, the rotating shaft bolt is provided with a conical opening 15, the conical opening is provided with an opening seam 16, a conical sleeve 17 is matched with the conical opening, and a pushing bolt 18 used for pushing the conical sleeve to move towards the inner side of the conical opening is connected with the rotating shaft bolt in a threaded mode through the conical sleeve.

An embodiment 4 of the self-centering steady rest is different from the embodiments 1-3 in that, as shown in fig. 1-4, the upper clamping arm includes a root arm 19 fixed on the first separating claw, and a front arm 20 hinged with the root arm, and the root arm and the front arm are provided with a pluggable pin 21 so as to be relatively fixed.

An embodiment 5 of the self-centering center frame is shown in figures 1-4, and is different from the embodiments 1-4 in that the upper clamping arm, the middle clamping arm and the lower clamping arm are provided with cross-shaped keys, the first separating claw, the second separating claw and the third separating claw are provided with key grooves matched with the corresponding cross-shaped keys, the key grooves are matched with the cross-shaped keys to fix the upper clamping arm and the first separating claw relatively, the fixing modes of the middle clamping arm and the lower clamping arm are the same, and the cross-shaped keys are in interference fit with the key grooves.

A self-centering center frame embodiment 6 is different from the embodiments 1 to 5 in that a protective sheet 22 for preventing chips from being caught between a workpiece and a support wheel is arranged outside the support wheel, a locking bolt 23 is arranged on a front guide plate for locking the position of the front guide plate and at least one of an upper clamping arm, a middle clamping arm and a lower clamping arm, at least one of the upper clamping arm, the middle clamping arm and the lower clamping arm is provided with a cooling liquid spraying device for cooling the support wheel and the surface of the workpiece, and the support wheel is a bearing, as shown in FIGS. 1 to 4.

A machine tool embodiment 1 comprising a self-centering steady rest as described in any one of the above.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.