Fixture for shot peening strengthening process of Almen test piece

Abstract

The invention provides an Almen test piece shot peening strengthening process clamp which comprises a base disc, a pin rod, a positioning plate and a supporting device, the supporting device comprises a bottom plate and a top plate, the top plate is fixedly connected with the base disc, the bottom plate is fixedly connected with a workbench of a machine tool, a first center hole is formed in the surface of the base disc, and second center holes are formed in the surfaces of the bottom plate and the top plate. The workbench of the machine tool is further provided with a datum hole, the first center hole, the second center hole and the datum hole are connected together in series through the pin rod, the surface of the base disc is further provided with a guide groove, the guide groove is communicated with the first center hole, the length direction of the guide groove is consistent with the radial direction of the first center hole, and one end of the positioning plate is fixedly connected to a groove opening of the guide groove. And the other end of the positioning plate is used for supporting the Almen test piece. According to the technical scheme, a plurality of Almen test pieces can be clamped on the surface of the base disc at a time, the clamping and positioning precision of the Almen test pieces on the clamp is improved, and shot blasting treatment results of the Almen test pieces in the same batch are kept highly consistent.

Description

Technical Field

[0001] The invention belongs to the technical field of jigs, and particularly relates to a jig for the shot peening strengthening process of Almen strips. Background Art

[0002] Almen strips play an important role in the quality control of shot peening technology. After one side of such a strip is impacted by shot, plastic deformation occurs on the surface layer, forming a spherical bend. When measuring this bend, the arc height from the reference surface to the highest point of the spherical surface is the characteristic index of the Almen strip. Almen strips are designed as standard specimens, often made of SAE1070 spring material. When performing shot peening on Almen strips, the relative angle between the Almen strip and the nozzle, and the relative angle between the shot peened surface of the part and the nozzle should be the same or similar, which requires using a high-precision jig to clamp and fix the Almen strip.

[0003] For example, the patent document with the publication number "CN204413871U" discloses an adjustable Almen strip fixing jig, including a dial with completely symmetrical sides on both sides, a cavity for connection and support, an Almen strip fixing block, and a pointer. The dial is connected to the cavity by a button head screw. A circular guiding groove is provided on the surface of the dial. The Almen strip fixing block is embedded in the circular guiding groove and can make a circular motion relative to the dial. A reference mark for aligning with the dial is provided on the Almen strip fixing block. The pivot point of the pointer is connected to the dial by an internal hexagonal screw, and the indicating point of the pointer fixes the Almen strip fixing block in the circular guiding groove by an internal hexagonal screw. With this patented technical solution, different shot peening strengthening results with different arc heights can be obtained by adjusting the clamping direction of the Almen strip. However, when performing shot peening on multiple Almen strips, the shot peening strengthening results of each time need to be as identical or close as possible. In addition, the shot peening intensity and shot peening angle need to be kept as consistent as possible. Therefore, a high-precision jig is required to clamp and fix the Almen strip. Summary of the Invention

[0004] To solve the above technical problems, the invention provides a jig for the shot peening strengthening process of Almen strips.

[0005] The invention is achieved through the following technical solutions.

[0006] The present invention provides a peening strengthening process fixture for Almen strips, which includes a base plate, a pin rod, a positioning plate and a supporting device. The supporting device includes a bottom plate and a top plate. The top plate is fixedly connected to the base plate, and the bottom plate is fixedly connected to the workbench of the machine tool. A first central hole is provided on the surface of the base plate, and second central holes are provided on the surfaces of both the bottom plate and the top plate. The workbench of the machine tool is also provided with a reference hole. The pin rod connects the first central hole, the second central holes and the reference hole in series. A guide groove is further provided on the surface of the base plate. The guide groove communicates with the first central hole, and the length direction of the guide groove is consistent with the radial direction of the first central hole. One end of the positioning plate is fixedly connected to the notch of the guide groove, and the other end of the positioning plate is used to support the Almen strip. Multiple main scale lines are further provided on the surface of the base plate, and the multiple main scale lines are arranged at equal intervals along the length direction of the guide groove. Multiple secondary scale lines are provided on the surface of the positioning plate, and the multiple secondary scale lines are arranged at equal intervals along the height direction of the positioning plate.

[0007] The machine tool is a vertical lathe.

[0008] The distance between any two adjacent main scale lines is 1 mm.

[0009] The distance between any two adjacent secondary scale lines is 1 mm.

[0010] The supporting device further includes multiple supporting columns, which are fixedly connected between the bottom plate and the top plate, and the multiple supporting columns are arranged at equal intervals around the periphery of the second central hole.

[0011] Both the bottom plate and the top plate are disc-shaped.

[0012] The peening strengthening process fixture for Almen strips further includes a locking screw and a locking nut. The guide groove is integrally in an inverted T shape. The locking nut is accommodated in the guide groove. The locking screw is connected to the locking nut through a thread pair, and the locking screw respectively penetrates through the positioning plate and the top plate.

[0013] The peening strengthening process fixture for Almen strips further includes an adjusting bolt. One end of the adjusting bolt is screwed to the top plate, the other end of the adjusting bolt serves as a top head, and the top head abuts against the surface of the positioning plate. The adjusting bolt also penetrates through the guide groove.

[0014] The number of the guide grooves is more than 4.

[0015] The positioning plate is integrally L-shaped.

[0016] The beneficial effects of the present invention are as follows: By adopting the technical solution of the present invention, on the one hand, the user can read the values of the main scale line and the secondary scale line to clamp and fix the Almen test piece on the surface of the base plate as consistently as possible. In addition, multiple Almen test pieces can be clamped on the surface of the base plate at one time, and the base plate, the bottom plate, the top plate and the workbench of the machine tool are connected in series by a pin rod, so that multiple Almen test pieces can be better accurately centered and distributed symmetrically with the central axis of the workbench of the machine tool as the center of symmetry, improving the clamping and positioning accuracy of the Almen test piece on the fixture. When the Almen test piece is subjected to shot peening treatment one by one through a spray gun, as long as the relevant technical parameters of the shot peening equipment remain constant, the shot peening intensity and the shot peening angle remain unchanged, so that the shot peening treatment results of the Almen test pieces in the same batch are highly consistent, improving the service performance of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the front view of the present invention;

[0018] Figure 2 is the top view of the base plate of the present invention;

[0019] Figure 3 is the top view of the top plate of the present invention;

[0020] Figure 4 is the front view of the positioning plate of the present invention;

[0021] Figure 5 is the present invention Figure 1 the partial enlarged view at position I in;

[0022] Figure 6 is the present invention Figure 1 the partial enlarged view at position II in.

[0023] In the figure: 1 - base plate, 2 - pin rod, 3 - positioning plate, 4 - supporting device, 5 - bottom plate, 6 - top plate, 7 - machine tool, 8 - first central hole, 9 - second central hole, 10 - guide groove, 11 - Almen test piece, 12 - main scale line, 13 - secondary scale line, 14 - supporting column, 15 - locking screw, 16 - locking nut, 17 - adjusting bolt, 18 - top head. DETAILED DESCRIPTION OF THE INVENTION

[0024] The technical solution of the present invention will be further described below, but the scope of protection is not limited thereto.

[0025] As Figures 1 to 6As shown in the figure, the present invention provides a shot peening strengthening process fixture for Almen strips, which is used for shot peening treatment of Almen strips. It includes a base plate 1, a pin rod 2, a positioning plate 3 and a supporting device 4. The supporting device 4 includes a bottom plate 5 and a top plate 6. The top plate 6 is fixedly connected to the base plate 1, and the bottom plate 5 is fixedly connected to the workbench of the machine tool 7. The surface of the base plate 1 is provided with a first central hole 8, and the surfaces of both the bottom plate 5 and the top plate 6 are provided with a second central hole 9. The workbench of the machine tool 7 is also provided with a reference hole. The pin rod 2 connects the first central hole 8, the second central hole 9 and the reference hole in series. The surface of the base plate 1 is also provided with a guide groove 10, which is communicated with the first central hole 8, and the length direction of the guide groove 10 is consistent with the radial direction of the first central hole 8. One end of the positioning plate 3 is fixedly connected to the notch of the guide groove 10, and the other end of the positioning plate 3 is used to support the Almen strip 11. The surface of the base plate 1 is also provided with a plurality of main scale lines 12, and the plurality of main scale lines 12 are arranged at equal intervals along the length direction of the guide groove 10. The surface of the positioning plate 3 is also provided with a plurality of secondary scale lines 13, and the plurality of secondary scale lines 13 are arranged at equal intervals along the height direction of the positioning plate 3.

[0026] Adopting the technical solution of the present invention, on the one hand, users can make the Almen strips be clamped and fixed on the surface of the base plate as consistently as possible by reading the values of the main scale lines and the secondary scale lines. In addition, multiple Almen strips can be clamped on the surface of the base plate at one time, and the base plate, the bottom plate, the top plate and the workbench of the machine tool are connected in series by the pin rod, so that multiple Almen strips can be better accurately centered and distributed with the central axis of the workbench of the machine tool as the center of symmetry, improving the clamping and positioning accuracy of the Almen strips on the fixture. When the Almen strips and the fixture rotate gradually with the workbench of the machine tool and the Almen strips are shot peened one by one by the spray gun, as long as the relevant technical parameters of the shot peening equipment remain constant, when shot peening the Almen strips of the same batch clamped on the surface of the base plate one by one, as long as the shot peening intensity and the shot peening angle are kept unchanged, the shot peening treatment results of the Almen strips of the same batch will be highly consistent, improving the service performance of the workpiece.

[0027] Specifically, the machine tool 7 is a vertical lathe. After the Almen strips are clamped, the machine tool can be started to make the Almen strips and the fixture rotate slowly with the workbench of the machine tool for at least 5 circles to adjust the centering accuracy of the Almen strips relative to the workbench of the machine tool. Adopting the technical solution of the present invention, the workbench of the vertical machine tool is connected to the main shaft, making use of the good centering characteristics of the workbench of the vertical machine tool, so that the Almen strips of the same batch can be clamped more precisely on the surface of the base plate of the fixture, thus improving the clamping and positioning accuracy of the Almen strips, making the shot peening treatment results of the Almen strips of the same batch highly consistent, and improving the service performance of the workpiece.

[0028] In addition, the distance between any two adjacent main scale lines 12 is 1 mm. The distance between any two adjacent sub-scale lines 13 is 1 mm. By adopting the technical solution of the present invention, the user can make the Almen test piece be clamped and fixed on the surface of the base plate as consistently as possible by reading the values of the main scale line and the sub-scale line.

[0029] In addition, the supporting device 4 further includes a plurality of supporting columns 14, the supporting columns 14 are fixedly connected between the bottom plate 5 and the top plate 6, and the plurality of supporting columns 14 are arranged at equal intervals around the periphery of the second central hole 9. Preferably, both the bottom plate 5 and the top plate 6 are in the shape of a disc.

[0030] Specifically, the Almen test piece shot peening strengthening process fixture further includes a locking screw 15 and a locking nut 16. The guide groove 10 is integrally in an inverted T shape. The locking nut 16 is accommodated in the guide groove 10. The locking screw 15 is connected to the locking nut 16 through a thread pair, and the locking screw 15 respectively penetrates through the positioning plate 3 and the top plate 6. The Almen test piece shot peening strengthening process fixture further includes an adjusting bolt 17. One end of the adjusting bolt 17 is screwed to the top plate 6, the other end of the adjusting bolt 17 serves as a top head 18, the top head 18 abuts against the surface of the positioning plate 3, and the adjusting bolt 17 also penetrates through the guide groove 10. Preferably, the number of the guide grooves 10 is more than 4, and the positioning plate 3 is integrally in an L shape. By adopting the technical solution of the present invention, the angle of the Almen test piece relative to the surface of the base plate can also be adjusted by screwing the adjusting bolt 7, so as to obtain the treatment results of the Almen test piece at different shot peening angles.

Claims

1. An Almen test piece shot peening process fixture, characterized in that: The invention comprises a base plate (1), a pin rod (2), a positioning plate (3) and a supporting device (4), wherein the supporting device (4) comprises a bottom plate (5) and a top plate (6), wherein the top plate (6) is fixedly connected to the base plate (1), and the bottom plate (5) is fixedly connected to a working table of a machine tool (7). A first center hole (8) is provided on the surface of the base plate (1), and a second center hole (9) is provided on the surface of the bottom plate (5) and the top plate (6). The working table of the machine tool (7) is also provided with a reference hole. The pin rod (2) connects the first center hole (8), the second center hole (9) and the reference hole in series. A guide groove (10) is also provided on the surface of the base plate (1). The guide groove (10) is connected to the first center hole (8), and the length direction of the guide groove (10) is consistent with the radial direction of the first center hole (8). One end of the positioning plate (3) is fixedly connected to the notch of the guide groove (10), and the other end of the positioning plate (3) is used to support the Almen test piece (11). The surface of the base plate (1) is also provided with a plurality of main scale lines (12), and the plurality of main scale lines (12) are arranged at equal intervals along the length direction of the guide groove (10). The surface of the positioning plate (3) is also provided with a plurality of secondary scale lines (13), and the plurality of secondary scale lines (13) are arranged at equal intervals along the height direction of the positioning plate (3).

2. The Almen test piece shot peening fixture according to claim 1, characterized in that: The machine tool (7) is a vertical lathe.

3. The Almen test piece shot peening fixture according to claim 1, characterized in that: The distance between any two adjacent main scale lines (12) is 1 mm.

4. The Almen test piece shot peening fixture according to claim 1, characterized in that: The distance between any two adjacent secondary scale lines (13) is 1 mm.

5. The Almen test piece shot peening fixture according to claim 1, characterized in that: The supporting device (4) further comprises a plurality of supporting columns (14), the supporting columns (14) being fixedly connected between the bottom plate (5) and the top plate (6), and the plurality of supporting columns (14) being arranged at equal intervals around the second center hole (9).

6. The Almen test piece shot peening fixture according to claim 5, characterized in that: The bottom plate (5) and the top plate (6) are both in the shape of a disc.

7. The Almen test piece shot peening fixture according to claim 1, characterized in that: The Almen test piece shot peening process fixture also includes a locking screw (15) and a locking nut (16); the guide groove (10) is in an inverted T-shape as a whole; the locking nut (16) is accommodated in the guide groove (10); the locking screw (15) and the locking nut (16) are connected together through a threaded pair; and the locking screw (15) passes through the positioning plate (3) and the top plate (6) respectively.

8. The Almen test piece shot peening fixture according to claim 7, characterized in that: The Almen test piece shot peening process fixture also includes an adjusting bolt (17), one end of which is screwed to the top plate (6), and the other end of which serves as a top head (18), which abuts against the surface of the positioning plate (3), and the adjusting bolt (17) also passes through the guide groove (10).

9. The Almen test piece shot peening fixture according to claim 1, 7 or 8, characterized in that: The number of the guide grooves (10) is more than 4.

10. The Almen test piece shot peening fixture according to claim 1, 7 or 8, characterized in that: The positioning plate (3) is L-shaped as a whole.

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