High-precision turning jig for special-shaped parts of engine

Abstract

The utility model relates to a high-precision turning jig for special-shaped parts of an engine, which comprises a mounting turntable, three clamping jaws for clamping workpieces to be machined are uniformly distributed on the turntable, three connecting columns are uniformly distributed on the first end face of the turntable, a positioning disc is fixedly arranged on the three connecting columns, and a positioning plate is fixedly arranged on the positioning disc. The distance between the first end face of the side, close to the rotary disc, of the positioning disc and the first end face of the rotary disc is larger than the distance between the first end face of the clamping jaw and the first end face of the rotary disc, the positioning disc is provided with a penetrating hole used for allowing a workpiece to be machined to penetrate through, and a limiting block for positioning the radial direction of the workpiece to be machined is fixedly arranged on the second end face of the positioning disc. A positioning supporting nail used for axially positioning a workpiece to be machined is arranged on the positioning disc, and the positioning supporting nail is supported on the first end face of the positioning disc. The limiting blocks and the positioning supporting nails can comprehensively position the workpiece, the clamping contact area of the three clamping jaws and the workpiece is large, and therefore clamping of the workpiece is more stable and reliable.

Description

Technical Field:

[0002] The utility model relates to a high-precision turning fixture for special-shaped parts of an engine. Background Art:

[0004] The engine support seat is usually circular and irregular. Since the cost of using turning for circular workpieces is the lowest, standard or heightened lathe jaws are usually purchased, three clampable positions are found, and then the jaws are modified for processing. However, due to the product structure problem, the clamping positions are relatively small, and because the surface hardness of the casting is hard and the allowance is unstable, the processing is unstable.

[0005] For example, in the Chinese patent "A fixture applied to the turning processing of special-shaped parts" with the publication number CN208826132U, which belongs to the field of machining of a special-shaped part of an armored vehicle, the fixture includes one-third fixture one, one-third fixture two, and one-third fixture three; one-third fixture one, one-third fixture two, and one-third fixture three can be respectively fixed to each jaw of the three-jaw chuck of the lathe; after the combination of one-third fixture one, one-third fixture two, and one-third fixture three, there is a polygonal groove in the middle, especially a rectangular groove, and the outer periphery is a cylinder; although this fixture solves the problem of difficult precision turning processing caused by uncertain rough turning tolerance dimensions for this type of part during precision turning processing; however, due to the relatively small clamping positions and the hard surface hardness and unstable allowance of the casting, the processing is unstable. Summary of the Invention:

[0007] In view of the above existing problems, the purpose of the utility model is to provide a high-precision turning fixture for special-shaped parts of an engine. The high-precision turning fixture for special-shaped parts of the engine has a simple structure and reasonable design, which is beneficial to increasing the stability and reliability of workpiece clamping.

[0008] The high-precision turning fixture for special-shaped parts of the engine of the utility model includes a turntable installed on the output shaft of the machine tool. Three jaws for clamping the workpiece to be processed are evenly arranged on the turntable. It is characterized in that: three connecting columns are evenly arranged on the first end face of the turntable. A positioning disk is fixed on the three connecting columns. The distance between the first end face of the positioning disk close to the turntable and the first end face of the turntable is greater than the distance between the first end face of the jaw and the first end face of the turntable. A through hole for the workpiece to be processed to pass through is arranged on the positioning disk. A limiting block for radially positioning the workpiece to be processed is fixed on the second end face of the positioning disk. A positioning support pin for axially positioning the workpiece to be processed is arranged on the positioning disk, and the positioning support pin supports on the first end face of the positioning disk.

[0009] Preferably, flange plates are fixed at both ends of the above connecting column, and the flange plates at both ends are respectively fixedly connected to the first end face of the turntable and the first end face of the positioning disk by screws.

[0010] Preferably, a recessed groove is provided on the above-mentioned jaw, a clamping block is detachably connected to the recessed groove, and wear-resistant blocks are embedded in the portion of the clamping block that contacts the workpiece to be machined.

[0011] Preferably, the above-mentioned wear-resistant block is made of tungsten steel.

[0012] Preferably, the above-mentioned positioning support pin passes through the first end face of the positioning disk and penetrates through the second end face of the positioning disk.

[0013] The usage method of the high-precision turning fixture for special-shaped parts of the engine of the present utility model is as follows. Before machining, the three jaws are relatively far apart. The workpiece to be machined is passed through the through hole, so that the first end of the workpiece is located between the three jaws, the second end of the workpiece is limited between several limit blocks, and the first end face of the workpiece is axially positioned on several positioning support pins. Then the jaws move relatively closer to clamp the workpiece.

[0014] Since the limit blocks and positioning support pins of the present application can comprehensively position the workpiece, and the clamping contact area between the three jaws and the workpiece is large, the clamping of the workpiece is more stable and reliable. Brief Description of the Drawings:

[0016] The following further illustrates the present utility model in conjunction with the drawings;

[0017] Figure 1 is a perspective view of the high-precision turning fixture for special-shaped parts of the engine of the present utility model;

[0018] Figure 2 , 3 is an exploded view of the high-precision turning fixture for special-shaped parts of the engine of the present utility model.

[0019] Figure 4 is Figure 2 a partial view of;

[0020] Figure 5 is Figure 3 a partial view of. Detailed Description of the Invention:

[0022] The following further illustrates the present utility model in conjunction with the drawings and specific embodiments.

[0023] The high-precision turning fixture for special-shaped parts of the engine of the present utility model includes a turntable 1 installed on the output shaft of the machine tool. Three jaws 2 for clamping the workpiece to be machined are evenly arranged on the turntable 1. Driven by the output shaft of the machine tool, the turntable 1 rotates synchronously, and the three jaws 2 can move relatively closer or relatively farther away to clamp or loosen the workpiece.

[0024] Three connecting columns 3 are evenly arranged on the first end face 101 of the turntable 1. A positioning disk 4 is fixedly arranged on the three connecting columns 3. Flange plates 7 are fixedly arranged at both ends of the connecting column 3. The flange plates 7 at both ends are fixedly connected to the first end face 101 of the turntable 1 and the first end face 401 of the positioning disk 4 by screws respectively.

[0025] The distance between the first end face (i.e., Figures 1-3 the lower surface of the positioning disk 4 in the middle) of the positioning disk 4 close to the turntable 1 and the first end face 101 of the turntable 1 is greater than the distance between the first end face 201 of the claw 2 and the first end face 101 of the turntable (i.e., the height of the connecting column is greater than the height of the claw), that is, the positioning disk 4 is farther away from the turntable 1, so as to avoid the positioning disk 4 interfering with the movement of the claw 2.

[0026] A perforation 402 for the workpiece K to be machined to pass through is provided on the positioning disk 4. The shape of the perforation 402 is not regular, but is opened according to the shape of the workpiece. Limit blocks 5 for positioning the radial direction of the workpiece to be machined are fixedly arranged on the second end face of the positioning disk 4. There are two to three of the limit blocks 5. Positioning support pins 6 for axially positioning the workpiece to be machined are provided on the positioning disk 4. The positioning support pins 6 support on the first end face of the positioning disk, and the workpiece is positioned radially and axially by the limit blocks 5 and the positioning support pins 6 respectively; the positioning support pins 6 pass through the first end face of the positioning disk and penetrate through the second end face of the positioning disk.

[0027] In order to facilitate meeting the shapes of different workpieces, a recessed groove is provided on the claw 2, and a clamping block 8 is detachably connected to the recessed groove. The surface shape of the clamping block 8 facing the workpiece is consistent with the outer peripheral shape of the workpiece, so as to clamp the workpiece when the claws approach each other relatively. Wear-resistant blocks 9 are embedded in the part of the clamping block 8 in contact with the workpiece to be machined. The wear-resistant blocks 9 can be made of tungsten steel.

[0028] The using method of the high-precision turning fixture for special-shaped parts of the engine of the present utility model. Before machining, the three claws are relatively far away from each other. The workpiece to be machined is passed through the perforation, so that the first end of the workpiece is located between the three claws, the second end of the workpiece is limited between several limit blocks, and the first end face of the workpiece is axially positioned on several positioning support pins, and then the claws approach each other relatively to clamp the workpiece.

[0029] Since the limit blocks and positioning support pins of the present application can comprehensively position the workpiece, the clamping contact area between the three claws and the workpiece is large, so that the clamping of the workpiece is more stable and reliable.

[0030] 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; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that it is still possible to modify the specific implementation manners of the present invention or make equivalent replacements for some technical features; without departing from the spirit of the technical solutions of the present invention, they should all be covered within the scope of the technical solutions claimed by the present invention.

Claims

1. A high-precision turning fixture for special-shaped engine parts, comprising a turntable mounted on the output shaft of a machine tool. Three chucks for clamping workpieces to be machined are evenly arranged on the turntable. It is characterized in that: Three connecting columns are evenly arranged on the first end surface of the turntable. A positioning disk is fixedly arranged on the three connecting columns. The distance between the first end surface of the positioning disk close to the turntable and the first end surface of the turntable is greater than the distance between the first end surface of the claw and the first end surface of the turntable. A perforation for the workpiece to be machined to pass through is arranged on the positioning disk. A limiting block for radially positioning the workpiece to be machined is fixedly arranged on the second end surface of the positioning disk. A positioning support pin for axially positioning the workpiece to be machined is arranged on the positioning disk, and the positioning support pin supports on the first end surface of the positioning disk.

2. The high-precision turning fixture for special-shaped engine parts according to claim 1, characterized in that: Flange plates are fixedly arranged at both ends of the connecting column, and the flange plates at both ends are fixedly connected to the first end surface of the turntable and the first end surface of the positioning disk respectively by screws.

3. The high-precision turning fixture for the special-shaped engine parts according to claim 1 or 2, characterized in that: A recessed groove is arranged on the claw, and a clamping block is detachably connected to the recessed groove. Wear-resistant blocks are embedded at the parts of the clamping block in contact with the workpiece to be machined.

4. The high-precision turning fixture for special-shaped engine parts according to claim 3, characterized in that: The wear-resistant block is made of tungsten steel.

5. The high-precision turning fixture for special-shaped engine parts according to claim 4, wherein: The positioning support pin passes through the first end surface of the positioning disk and penetrates out of the second end surface of the positioning disk.

Images