Lathe fixture for non-rotary body part

Abstract

The utility model relates to a lathe fixture, in particular to a lathe fixture for a non-rotary part. The lathe fixture aims to solve the problems that in the prior art, before grinding machining of non-rotary parts, due to the fact that blank appearance errors of the non-rotary parts are large, the positioning accuracy of the parts cannot be guaranteed, and the clamping stability of the lathe fixture is affected by rotational inertia generated in the machining process. The fixture is composed of a fixture body, an alignment assembly, a positioning assembly, a supporting assembly and a balancing weight. Before machining, the non-rotating body part is placed on the positioning device, the positioning assembly is used for carrying out primary positioning on the non-rotating body part, the alignment assembly is used for carrying out secondary positioning on the non-rotating body part, and therefore accurate positioning of the non-rotating body part is achieved. In the machining process, the balancing weight arranged on the clamp body can balance rotational inertia, and clamping stability is ensured.

Description

Technical Field

[0001] The utility model relates to a lathe clamp, in particular to a lathe clamp for non-rotating parts. Background Art

[0002] Lathe fixtures are widely used in the machining industry and are usually composed of alignment components, clamping devices, connecting components, and fixture bases. The alignment components are used to determine the precise position of the part in the fixture. Figure 1 (The dotted line represents the non-rotating part.) Lathe fixtures typically use the non-rotating part's blank shape and bearing hole as a reference for alignment and positioning prior to machining, ensuring the part is accurately positioned at the center of rotation of the vertical lathe. However, when the blank shape of a non-rotating part differs significantly from the finished product, existing positioning methods cannot guarantee accurate positioning. Furthermore, during machining, the fixture's moment of inertia can easily affect its grip stability on the non-rotating part, causing the part to loosen or shift during machining, impacting machining efficiency and quality.

[0003] Chinese patent CN109807666A discloses a lathe fixture for non-rotating parts. By tightening a nut on a pressure plate, the clamp is used to fix the non-rotating part to the fixture base, and the fixture base is connected to the lathe chuck to achieve lathe processing of non-rotating parts. While reducing the weight of the fixture, it avoids the phenomenon of vibration during processing due to weight imbalance, thereby ensuring processing accuracy. Chinese patent CN116214746A discloses a fixture and method for processing the outer contour of non-rotating conical thin-walled parts. The fixture clamps and positions the non-rotating part through an external support unit, an internal support unit, and a tailstock unit. By moving the tailstock and external support, the spherical end face of the part is processed, and the non-rotating conical thin-walled part can be firmly and reliably clamped. However, the above two fixtures improve the clamping stability of the fixture by balancing the center of gravity and adding clamping components, respectively. However, neither solves the problem that the positioning accuracy of the part cannot be guaranteed before processing, and the moment of inertia generated during processing affects the clamping stability of the fixture. Utility Model Content

[0004] The main purpose of the utility model is to solve the problems in the prior art that the positioning accuracy of non-rotating parts cannot be guaranteed due to the large error in the blank shape before grinding, and the rotational inertia generated during the processing affects the clamping stability of the lathe fixture, and to provide a lathe fixture for non-rotating parts.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A lathe fixture for non-rotating parts includes a fixture body, a support assembly for supporting the non-rotating parts, and a positioning assembly for fixing the non-rotating parts. The special features of the fixture are:

[0007] Also included is an alignment component, which includes an alignment seat and an alignment rod;

[0008] A through hole is provided in the center of the clamp body, the small end of the alignment seat is embedded in the through hole, and the large end thereof is fixed to the upper surface of the clamp body by screws;

[0009] A mounting hole is provided at the center of the alignment seat, and the lower part of the alignment rod is installed in the mounting hole on the alignment seat, and the outer diameter of the alignment rod is adapted to the aperture of the mounting hole of the alignment seat, so that the alignment rod can rotate in the mounting hole of the alignment seat; a positioning cone is provided at the middle part of the alignment rod, the large end diameter of the positioning cone is larger than the center hole diameter of the non-rotating part, and the small end diameter is smaller than the center hole diameter of the non-rotating part, thereby ensuring that the side wall of the positioning cone abuts against the edge of the bearing hole of the non-rotating part when the alignment is completed, thereby ensuring the alignment effect;

[0010] Also included are a plurality of counterweights for balancing the center of gravity of the clamp body.

[0011] Furthermore, there are seven counterweight blocks, all of which are located on the side of the end face of the clamp body away from the conical positioning assembly. Five of the counterweight blocks are arranged on the end face of the clamp body near the outer side, and the other two counterweight blocks are arranged on the end face of the clamp body near the inner side, which are used to balance the center of gravity of the clamp body and reduce the influence of the rotational inertia generated during the processing on the clamping of the fixture.

[0012] Furthermore, the positioning assembly for fixing the non-rotating part includes a conical positioning assembly, a diamond positioning assembly and a limit assembly, and the conical positioning assembly and the diamond positioning assembly are both fixedly mounted on the clamp body at positions corresponding to the two positioning holes of the non-rotating part to be positioned; the limit assembly is fixed on the clamp body at a position abutting the side wall of the non-rotating part.

[0013] Furthermore, the conical positioning assembly consists of a support, a spring installed in the support groove, a conical positioning pin arranged above the spring, and a limit screw arranged on the support and used to position the conical positioning pin; the diamond positioning assembly consists of a support, a spring installed in the support groove, a diamond positioning pin arranged above the spring, and a limit screw arranged on the support and used to position the diamond positioning pin; the lower part of the support of the conical positioning assembly and the diamond positioning assembly are both provided with a positioning pin, which cooperates with the pin hole provided on the clamp body and is fixed to the clamp body by the screw on its support.

[0014] Furthermore, the limiting assembly consists of a support and a limiting column fixedly mounted on the support, which is fixedly mounted on the clamp body by screws on its support and is used to limit the side wall of the protruding part of the non-rotating part to be positioned.

[0015] Furthermore, the support assembly for supporting the non-rotating part includes a support column for supporting four bosses on the edge of the non-rotating part, a pressure plate assembly arranged at a corresponding position on the outside of each support column, and a plurality of spring positioning assemblies for supporting the lower surface of the non-rotating part. Each of the support column, pressure plate assembly and spring positioning assembly is fixedly mounted on the clamp body.

[0016] Furthermore, each of the spring positioning assemblies is composed of a support, a spring installed in a groove of the support, a positioning column arranged above the spring, and a fastening screw arranged on the support and used to position the positioning column, which is used to further support the non-rotating parts and prevent the non-rotating parts from moving up and down during the alignment process.

[0017] Furthermore, the pressure plate assembly consists of a support and a pressure plate fixedly mounted on the support, one end of the pressure plate is located above the support column, and is used to press the four bosses on the edge of the non-rotating part to be positioned onto the support column in correspondence with the support column.

[0018] Furthermore, the clamp body is evenly provided with four lifting ears along the circumferential direction for lifting the lathe clamp onto the lathe.

[0019] Furthermore, a plurality of lathe connection positioning keys are provided on the bottom of the clamp body for fixedly connecting the clamp body to the lathe.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. The utility model provides a lathe fixture for non-rotating parts, which uses a positioning component to perform a primary positioning on the non-rotating part, uses a aligning rod to perform a secondary positioning, and presses the four bosses on the edge of the non-rotating part to achieve precise positioning of the non-rotating part.

[0022] 2. The utility model provides a lathe fixture for non-rotating parts. During the secondary positioning process, the parts can be aligned by simply rotating the alignment rod. The operation is simple and the alignment speed is fast.

[0023] 3. The utility model provides a lathe clamp for non-rotating parts, in which a plurality of counterweight blocks are arranged on the clamp body, thereby reducing the influence of the moment of inertia on the clamping stability of the non-rotating parts during processing, thereby improving processing efficiency and quality.

[0024] 4. The lathe fixture for non-rotating parts provided by the utility model has a simple structure, low manufacturing cost, convenient installation and operation, and good workability and promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a top view of a lathe fixture for non-rotating parts according to the present invention;

[0026] Figure 2 for Figure 1 AA section view;

[0027] Figure 3 for Figure 1 BB cross-sectional view.

[0028] Description of reference numerals:

[0029] 1-Clamping base; 2-Cone positioning assembly; 3-Support column; 4-Pressing plate assembly; 5-Counterweight block; 6-Diamond positioning assembly; 7-Limiting assembly; 8-Alignment seat; 9-Alignment rod; 10-Spring positioning assembly; 11-Lifting ear; 12-Lathe connection positioning key. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0031] A lathe fixture for non-rotating parts, comprising a fixture body 1, wherein the fixture body 1 is a perfect circle, and an edge thereof is provided with eight grooves distributed along the circumference and extending along the radial direction, for clamping the lathe fixture to corresponding positions on the lathe;

[0032] The clamp body 1 is also provided with four lifting ears 11 evenly arranged along the circumference, for lifting the lathe clamp onto the lathe;

[0033] A through hole is provided in the center of the clamp body 1, and the alignment seat 8 is fixedly mounted on the through hole of the clamp body 1 by means of bolts. A mounting hole concentric with the through hole on the clamp body 1 is also provided in the center of the alignment seat 8. The lower part of the alignment rod 9 is mounted in the mounting hole of the alignment seat 8, and the outer diameter of the alignment rod 9 is adapted to the aperture of the mounting hole of the alignment seat 8, so that the alignment rod 9 can rotate in the mounting hole of the alignment seat 8; a positioning cone is provided in the middle part of the alignment rod 9, the large end diameter of the positioning cone is larger than the center hole diameter of the non-rotating part, and the small end diameter is smaller than the center hole diameter of the non-rotating part, thereby ensuring that the side wall of the positioning cone abuts against the edge of the bearing hole of the non-rotating part when the alignment is completed, thereby ensuring the alignment effect;

[0034] The clamp body 1 is also provided with seven counterweights 5, which are all located on the side of the end surface of the clamp body 1 away from the conical positioning assembly 2, wherein five counterweights 5 are arranged on the end surface of the clamp body 1 near the outer side, and the other two counterweights 5 are arranged on the end surface of the clamp body 1 near the inner side to balance the center of gravity of the clamp body 1 and reduce the influence of the moment of inertia generated during the processing on the clamping of the fixture;

[0035] The positions of the clamp body 1 corresponding to the two mounting holes of the non-rotating parts are respectively provided with a conical positioning component 2 and a diamond positioning component 6; the conical positioning component 2 is composed of a support, a spring installed in the support groove, a conical positioning pin arranged above the spring, and a fastening screw arranged on the support and used for positioning the conical positioning pin, and the diamond positioning component 6 is composed of a support, a spring installed in the support groove, a diamond positioning pin arranged above the spring, and a fastening screw arranged on the support and used for positioning the diamond positioning pin; the lower part of the support of the conical positioning component 2 and the diamond positioning component 6 is provided with a positioning pin, which cooperates with the pin hole provided on the clamp body 1 and is fixedly installed on the clamp body 1;

[0036] The positions of the clamp body 1 corresponding to the bosses on the edge of the non-rotating part are respectively fixed with a support column 3 by bolts. A pressure plate assembly 4 is correspondingly provided on the outer side of each support column 3 on the clamp body 1. Each pressure plate assembly 4 consists of a support and a pressure plate fixedly installed on the support. One end of the pressure plate is located above the support column 3 and is fixedly installed on the clamp body 1 by bolts, and is used to press the four bosses on the edge of the non-rotating part to be positioned onto the support column 3 corresponding to the support column 3;

[0037] A limiting assembly 7 is also fixedly installed on the clamp body 1 at a position where the side wall of the protruding portion of the non-rotating part to be positioned abuts against the side wall by means of bolts. The limiting assembly 7 is composed of a support and a limiting column fixedly installed on the support, and is used to initially limit the side wall of the protruding portion of the non-rotating part to be positioned;

[0038] Nine spring positioning assemblies 10 are also dispersedly provided on the clamp body 1. Each spring positioning assembly 10 is composed of a support, a spring installed in a groove of the support, a positioning column arranged above the spring, and a fastening screw. Each spring positioning assembly 10 is fixed to the clamp body 1 by a bolt on the support, and is used to further support the non-rotating parts to prevent the non-rotating parts from moving up and down during the alignment process.

[0039] Two lathe connection positioning keys 12 are also provided on the base of the clamp body 1 for fixing the lathe clamp on the lathe during processing.

[0040] During use, first loosen the pressure plates on all pressure plate assemblies 4, hang the non-rotating part to be positioned on the lathe fixture, and the four positioning bosses set on the edge of the non-rotating part to be positioned are placed on the four support columns 3, and the two mounting holes on the non-rotating part to be positioned pass through the conical positioning pin on the conical positioning assembly 2 and the diamond positioning pin on the diamond positioning assembly 6 respectively, and the lower surface of the non-rotating part to be positioned abuts against the positioning column on the spring positioning assembly 10, and the side wall of the non-rotating part to be positioned abuts against the limit block on the limit assembly 7. At this time, the bearing hole in the center of the non-rotating part to be positioned is roughly aligned with the pin hole on the alignment seat 8, and one positioning is completed; then, the lower part of the alignment rod 9 passes through the bearing hole in the center of the non-rotating part to be positioned and is inserted into the pin hole opened on the alignment seat 8. At this time, the positioning cone on the alignment rod 9 is located at the center axis of the non-rotating part to be positioned. Above the bearing hole, and not concentric with the center bearing hole of the non-rotating part to be positioned, rotate the alignment rod 9 and squeeze the positioning cone into the bearing hole in the center of the non-rotating part to be positioned, until the side wall of the positioning cone on the alignment rod 9 abuts the edge of the center bearing hole of the non-rotating part to be positioned; secondly, tighten the clamping nuts on the four pressure plate assemblies 4 so that the pressure plates on the four pressure plate assemblies 4 press the parts downward. At the same time, tighten the fastening screws on the nine spring positioning assemblies 10 dispersedly arranged on the clamp body 1 so that each positioning column presses upward against the lower surface of the non-rotating part to be positioned; finally, remove the alignment rod 9 to complete the secondary positioning, and hoist the lathe clamp and the non-rotating part positioned thereon to the lathe through the four lifting ears 11 provided on the clamp body 1, and fix it on the lathe through the two lathe connection positioning keys 12 provided at the bottom of the clamp body 1, and subsequent processing can be carried out. During the machining process, the seven counterweights 5 arranged on the clamp body 1 can balance the rotational inertia generated when the lathe drives the lathe clamp to rotate, thereby ensuring the clamping stability of the pressure plate on the pressure plate assembly 4.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. For ordinary professional and technical personnel in this field, the specific technical solutions recorded in the above embodiments can be modified, or some of the technical features therein can be replaced by equivalents. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions protected by the present invention.

Claims

1. A lathe fixture for non-rotating parts, comprising a fixture body (1), a support assembly for supporting the non-rotating parts, and a positioning assembly for fixing the non-rotating parts, characterized in that: It also includes an alignment component, which includes an alignment seat (8) and an alignment rod (9); A through hole is provided at the center of the clamp body (1), the small end of the alignment seat (8) is embedded in the through hole, and the large end thereof is fixed to the upper surface of the clamp body (1) by screws; A mounting hole is provided at the center of the alignment seat (8), the lower portion of the alignment rod (9) is mounted in the mounting hole on the alignment seat (8), and the outer diameter of the alignment rod (9) is adapted to the aperture of the mounting hole of the alignment seat (8), so that the alignment rod (9) can rotate in the mounting hole of the alignment seat (8); a positioning cone is provided at the middle portion of the alignment rod (9), the large end diameter of the positioning cone being larger than the center hole diameter of the non-rotating part, and the small end diameter being smaller than the center hole diameter of the non-rotating part; It also includes a plurality of counterweight blocks (5) for balancing the center of gravity of the clamp body (1).

2. The lathe fixture for non-rotating parts according to claim 1, characterized in that: There are seven counterweight blocks (5), and all seven counterweight blocks (5) are located on a side of the end surface of the clamp body (1) away from the conical positioning assembly (2), wherein five counterweight blocks (5) are arranged on the end surface of the clamp body (1) near the outer side, and the other two counterweight blocks (5) are arranged on the end surface of the clamp body (1) near the inner side.

3. The lathe fixture for non-rotating parts according to claim 1, characterized in that: The positioning assembly for fixing the non-rotating part comprises a conical positioning assembly (2), a diamond positioning assembly (6) and a limiting assembly (7); the conical positioning assembly (2) and the diamond positioning assembly (6) are both fixedly mounted on the clamp body (1) at positions corresponding to two positioning holes of the non-rotating part to be positioned; and the limiting assembly (7) is fixed on the clamp body (1) at a position abutting against the side wall of the non-rotating part.

4. The lathe fixture for non-rotating parts according to claim 3, characterized in that: The conical positioning assembly (2) is composed of a support, a spring installed in a groove of the support, a conical positioning pin arranged above the spring, and a limit screw arranged on the support for positioning the conical positioning pin; the diamond positioning assembly (6) is composed of a support, a spring installed in a groove of the support, a diamond positioning pin arranged above the spring, and a limit screw arranged on the support for positioning the diamond positioning pin; the lower part of the support of the conical positioning assembly (2) and the diamond positioning assembly (6) is provided with a positioning pin, which cooperates with the pin hole provided on the clamp body (1) and is fixedly installed on the clamp body (1) by the screw on its support.

5. The lathe fixture for non-rotating parts according to claim 3, characterized in that: The limiting assembly (7) consists of a support and a limiting column fixedly mounted on the support, and is fixedly mounted on the clamp body (1) via screws on the support.

6. The lathe fixture for non-rotating parts according to claim 1, characterized in that: The support assembly for supporting the non-rotating part comprises a support column (3) for supporting four bosses on the edge of the non-rotating part, a pressure plate assembly (4) arranged at a corresponding position outside each support column (3), and a plurality of spring positioning assemblies (10) for supporting the lower surface of the non-rotating part. Each support column (3), pressure plate assembly (4) and spring positioning assembly (10) are fixedly mounted on the clamp body (1).

7. The lathe fixture for non-rotating parts according to claim 6, characterized in that: Each of the spring positioning components (10) is composed of a support, a spring installed in a groove of the support, a positioning column arranged above the spring, and a fastening screw arranged on the support and used for positioning the positioning column.

8. The lathe fixture for non-rotating parts according to claim 6, characterized in that: The pressure plate assembly (4) consists of a support and a pressure plate fixedly mounted on the support, one end of the pressure plate being located above the support column (3) and used to press four bosses on the edge of the non-rotating part to be positioned onto the support column (3) in correspondence with the support column (3).

9. The lathe fixture for non-rotating parts according to claim 1, characterized in that: The clamp body (1) is also provided with four lifting ears (11) evenly arranged along the circumferential direction.

10. The lathe fixture for non-rotating parts according to claim 1, characterized in that: The bottom of the clamp body (1) is also provided with a plurality of lathe connection positioning keys (12) for fixedly connecting the clamp body (1) to the lathe.

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