Square workpiece fastening clamp for three-jaw chuck

Abstract

The square workpiece fastening clamp for the three-jaw chuck comprises a cylinder body, a workpiece square groove is formed in the center of the cylinder body, round hole grooves are formed in the positions, at the four corners of the workpiece square groove, of the cylinder body, and a redundant gap is formed in the position, in the middle of one side of the workpiece square groove, of the cylinder body. The cylindrical body is provided with the workpiece square groove, the circular hole grooves and the redundant gaps are matched with the four corners of the workpiece square groove, a square workpiece can be placed in the workpiece square groove, then the cylindrical body is directly clamped through the three-jaw hydraulic chuck, and the inner groove face of the workpiece square groove can extrude and fix the square workpiece body through deformation of the circular hole grooves. And a special fixture is not needed, so that the processing cost is reduced, and the practicability of the device is enhanced.

Description

Technical Field

[0001] This utility model relates to the field of fastening fixture technology, and in particular to a square workpiece fastening fixture for a three-jaw chuck. Background Technology

[0002] In the field of bushing processing, since the bushing insertion hole of some equipment is a square hole, it is necessary to process a special-shaped bushing workpiece with a square outer side and a round hole in the center. This special-shaped bushing workpiece needs to be processed by lathe to process the inner wall of the bushing. Therefore, before processing, the special-shaped bushing workpiece needs to be centered and fastened.

[0003] Although there are special chucks for such irregularly shaped workpieces in the existing technology, most of the lathes used in existing bushing processing plants use three-jaw chucks because the majority of workpieces are round. Purchasing special fixtures specifically for a small number of irregularly shaped bushing workpieces would be too costly. Furthermore, before production, it would be necessary to stop production and modify the existing equipment. Since the production batches are small, the chucks would need to be changed back to the original three-jaw chucks after production is completed. This further increases the processing cost of irregularly shaped workpieces, so there is room for further improvement. Utility Model Content

[0004] The purpose of this utility model is to at least solve one of the technical problems existing in the prior art, and to provide a square workpiece fastening fixture for a three-jaw chuck, thereby solving the above-mentioned problem.

[0005] To achieve the above objectives, a square workpiece fastening fixture for a three-jaw chuck is provided, comprising a cylindrical body, a workpiece square groove at the center of the cylindrical body, round hole grooves at the four corners of the workpiece square groove, and a redundant gap at the middle of one side of the workpiece square groove.

[0006] Two fixing screw holes are symmetrically opened on the lower two sides of the cylindrical body. Two fixing screws are threadedly connected to the bottom of the cylindrical body through the two fixing screw holes. Limiting plates are provided on both sides of the bottom of the cylindrical body, and screw limiting holes are opened at the positions of the two limiting plates corresponding to the fixing screws.

[0007] According to the aforementioned square workpiece fastening fixture for a three-jaw chuck, the positions of the two fixing screw holes correspond to the positions of the middle of both ends of the square groove of the workpiece.

[0008] According to the square workpiece fastening fixture for a three-jaw chuck, both of the limiting plates are fixedly connected to the bottom sides of the cylindrical body through screw limiting holes and fixing screws respectively.

[0009] According to the aforementioned square workpiece fastening fixture for a three-jaw chuck, both of the limiting plates are provided with flanges that extend into the square groove of the workpiece at their ends near the workpiece groove.

[0010] According to the square workpiece fastening fixture for a three-jaw chuck, both of the fixing screws are existing hex socket head cap screws.

[0011] The above solution has at least one of the following beneficial effects:

[0012] 1. The cylindrical body of this utility model is provided with a workpiece square groove. With the round hole grooves at the four corners of the workpiece square groove and the redundant gap, a square workpiece can be placed in the workpiece square groove. Then, the cylindrical body can be directly clamped by a three-jaw hydraulic chuck. The deformation of the round hole groove can make the inner groove of the workpiece square groove face the square workpiece body to form a compression fixation. There is no need to set up special fixtures, which reduces processing costs and enhances the practicality of the device.

[0013] 2. By setting round hole slots at the four corners of the workpiece square groove, this utility model not only reduces the extrusion force required for deformation of the workpiece square groove, but also prevents plastic deformation caused by stress concentration extrusion at the four corners of the workpiece square groove, thereby improving the service life of the fixture and enhancing the practicality of the device.

[0014] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0016] Figure 1 This is a top-view three-dimensional structural diagram of a square workpiece fastening fixture for a three-jaw chuck according to the present invention;

[0017] Figure 2 This is a bottom-view three-dimensional structural diagram of a square workpiece fastening fixture for a three-jaw chuck according to the present invention.

[0018] Figure 3 This is an exploded view of a square workpiece fastening fixture for a three-jaw chuck according to the present invention.

[0019] Legend:

[0020] 1. Cylindrical body; 2. Workpiece square groove; 3. Redundant clearance; 4. Round hole groove; 5. Fixing screw hole; 6. Fixing screw; 7. Limiting plate; 8. Screw limiting hole. Detailed Implementation

[0021] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the description of the textual part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0022] Reference Figure 1-3 This utility model provides a square workpiece fastening fixture for a three-jaw chuck, including a cylindrical body 1. A square workpiece groove 2 is provided at the center of the cylindrical body 1. Circular holes 4 are provided at the four corners of the square workpiece groove 2. The circular holes 4 at the four corners of the square workpiece groove 2 not only reduce the extrusion force required for deformation of the square workpiece groove 2, but also prevent plastic deformation caused by stress concentration at the four corners of the square workpiece groove 2, thus improving the service life of the fixture. A redundant gap 3 is provided in the middle of one side of the square workpiece groove 2 of the cylindrical body 1 to accommodate the deformation allowance. In use, the square workpiece can be placed in the square workpiece groove 2 first, and then the cylindrical body 1 can be clamped directly by the three-jaw hydraulic chuck. The deformation of the cylindrical body 1 at the four circular holes 4 can cause the inner groove of the square workpiece groove 2 to form an extrusion fixation on the square workpiece body, eliminating the need for a special fixture and reducing processing costs.

[0023] Two fixing screw holes 5 are symmetrically opened on both sides of the bottom of the cylindrical body 1. The positions of the two fixing screw holes 5 correspond to the middle positions of the two ends of the workpiece square groove 2. Two fixing screws 6 are threadedly connected to the bottom of the cylindrical body 1 through the two fixing screw holes 5. Both fixing screws 6 are existing internal hex screws. Limiting plates 7 are provided on both sides of the bottom of the cylindrical body 1. Screw limiting holes 8 are opened at the positions of the two limiting plates 7 corresponding to the fixing screws 6. The two limiting plates 7 are fixedly connected to the bottom sides of the cylindrical body 1 through the screw limiting holes 8 and the fixing screws 6 respectively. The end of the two limiting plates 7 near the workpiece square groove 2 is provided with a flange that protrudes into the range of the workpiece square groove 2 to limit the square workpiece and ensure the stability of the workpiece's processing position.

[0024] Working principle: In use, the cylindrical body 1 is provided with a workpiece square groove 2, which, together with the round hole grooves 4 at the four corners of the workpiece square groove 2 and the redundant gap 3, allows the square workpiece to be placed in the workpiece square groove 2 first. Then, the cylindrical body 1 is directly clamped by a three-jaw hydraulic chuck. The deformation of the cylindrical body 1 at the four round hole grooves 4 causes the inner groove of the workpiece square groove 2 to press and fix the square workpiece body. No special fixture is required, which reduces the processing cost. In addition, the round hole grooves 4 at the four corners of the workpiece square groove 2 not only reduce the pressing force required for the deformation of the workpiece square groove 2, but also prevent plastic deformation caused by stress concentration at the four corners of the workpiece square groove 2, thus improving the service life of the fixture.

[0025] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A square workpiece fastening fixture for a three-jaw chuck, comprising a cylindrical body (1), characterized in that: The cylindrical body (1) has a workpiece square groove (2) at its center, and the cylindrical body (1) has round hole grooves (4) at each of the four corners of the workpiece square groove (2). The cylindrical body (1) has a redundant gap (3) in the middle of one side of the workpiece square groove (2). Two fixing screw holes (5) are symmetrically opened on the lower sides of the cylindrical body (1). Two fixing screws (6) are threadedly connected to the bottom of the cylindrical body (1) through the two fixing screw holes (5). Limiting plates (7) are provided on both sides of the bottom of the cylindrical body (1). Screw limiting holes (8) are opened at the positions corresponding to the fixing screws (6) of the two limiting plates (7).

2. A square workpiece fastening fixture for a three-jaw chuck according to claim 1, characterized in that, The positions of the two fixing screw holes (5) correspond to the positions of the middle of both ends of the workpiece square groove (2).

3. A square workpiece fastening fixture for a three-jaw chuck according to claim 1, characterized in that, Both of the limiting plates (7) are fixedly connected to the bottom sides of the cylindrical body (1) through screw limiting holes (8) and fixing screws (6).

4. A square workpiece fastening fixture for a three-jaw chuck according to claim 1, characterized in that, Both of the limiting plates (7) are provided with flanges that extend into the workpiece square groove (2) at the end near the workpiece square groove (2).

5. A square workpiece fastening fixture for a three-jaw chuck according to claim 1, characterized in that, Both of the aforementioned fixing screws (6) are existing internal hex screws.

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