Groove blade grinding clamp

Abstract

The groove blade grinding clamp comprises a base, a positioning plate, a clamping piece and a pressing plate, the positioning plate is fixedly installed on the base and matched with the base to form a containing cavity of a groove blade, the clamping piece comprises a clamping conical face, a clamping bottom face, a pin hole and two clamping faces, and the pressing plate comprises an installation portion and a working portion. The mounting part is used for mounting the pressing plate on a machine tool clamping mechanism so that the machine tool clamping mechanism can drive the pressing plate to rotate and press the clamping piece, the working part is provided with a conical surface, a supporting plane and a pin column, the pin column is arranged on the supporting plane and is coaxial with the conical surface, the clamping piece is arranged between the side positioning surface of the groove blade and the pressing plate, and the clamping bottom surface is arranged on the supporting plane. The clamping conical surfaces are matched with the conical surfaces, the pin holes are in clearance fit with the pin columns, and when the pressing plate rotates and drives the clamping pieces to clamp the groove blade, the clamping pieces can rotate around the axes of the clamping conical surfaces so that the two clamping surfaces can abut against the front end and the rear end of the side positioning surface of the groove blade respectively. The positioning is stable and reliable, and the manufacturing difficulty is low.

Description

Technical Field

[0001] The present invention mainly relates to the field of metal cutting tool processing, and particularly relates to a groove blade grinding fixture. Background Art

[0002] The rake face of the groove blade is processed by grooving grinding, which can greatly improve the sharpness and quality of the groove blade edge. However, due to the structure of the groove blade being a thin and long shape with wide ends and narrow middle, whether in CNC grinding machines or traditional grinding machines for grooving processing, the classic fixture method of "base + positioning plate + pressing plate" is adopted. In the existing automated groove blade grooving CNC machine tools, a traditional swing-arm type clamping fixture is used. In order to avoid the tool head of the groove blade and the clamping space of the manipulator, two positioning bosses are formed on the upper part of the base, isolating three clearance spaces. When the swing-arm pressing plate uses one clamping point and acts on the middle of the two positioning bosses, the groove blade can be positioned and clamped, but the groove blade is extremely easy to be broken by the pressing plate; when the swing-arm pressing plate uses two clamping points and acts on the two positioning bosses respectively, the groove blade can be prevented from being broken by the pressing plate, but it is very difficult for the two clamping points of the swing-arm pressing plate to act on the groove blade simultaneously, and effective positioning and clamping cannot be formed. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a groove blade grinding fixture with stable and reliable positioning and low manufacturing difficulty.

[0004] To solve the above technical problem, the present invention adopts the following technical solutions:

[0005] A groove blade grinding fixture, comprising a base, a positioning plate, a clamping piece and a pressing plate. The positioning plate is fixedly installed on the base and cooperates with the base to form a receiving cavity for the groove blade. The clamping piece includes a clamping conical surface, a clamping bottom surface, a pin hole and two clamping surfaces. The pressing plate includes an installation part and a working part. The installation part is used to install the pressing plate on the machine tool clamping mechanism so that the machine tool clamping mechanism can drive the pressing plate to rotate and press the clamping piece. The working part is provided with a conical surface, a supporting plane and a pin. The pin is arranged on the supporting plane and is coaxial with the conical surface. The clamping piece is arranged between the side positioning surface of the groove blade and the pressing plate. The clamping bottom surface is placed on the supporting plane. The clamping conical surface cooperates with the conical surface. The pin hole has a clearance fit with the pin. When the pressing plate rotates and drives the clamping piece to clamp the groove blade, the clamping piece can rotate around the axis of the clamping conical surface so that the two clamping surfaces respectively abut against the front and rear ends of the side positioning surface of the groove blade.

[0006] As a further improvement of the above technical solution:

[0007] The working part includes a limiting platform and two limiting surfaces. The conical surface is arranged on the side wall of the limiting platform, and the two limiting surfaces are respectively arranged on both sides of the conical surface.

[0008] The cone angle of the conical surface is α, and the circular arc central angle is A, which should satisfy: 2° < α ≤ 425°, 60° ≤ A ≤ 90°.

[0009] A process clearance surface is arranged between the conical surface and the support plane. The height of the conical surface is L2, and the effective height between the conical surface and the support plane is L3, and L3 < L2.

[0010] The cone angle of the clamping conical surface is γ, the circular arc radius of the clamping conical surface is R2, and the circular arc radius of the conical surface is R1, which should satisfy: γ = α, R1 = R2.

[0011] The width of the clamping piece is L4, the thickness is L5, and the circular arc chord length of the conical surface is L1, which should satisfy: L4 = L1, L5 = L3.

[0012] The two limiting surfaces are symmetrically distributed and there is an included angle β between them, which should satisfy: 5° ≤ β ≤ 30°. The height of the limiting surface is L6, which should satisfy: 0.2L3 ≤ L6 ≤ 0.33L3.

[0013] The diameter of the pin hole is D, and the diameter of the pin column is d, which should satisfy: L6 * Tanα < 0.5 * (D - d) < (L3 - L4) * Tanα.

[0014] A clamping clearance surface is arranged between the two clamping surfaces.

[0015] The base is provided with a positioning plate support surface, a blade positioning boss and a clearance surface. The positioning plate is provided with a waist-shaped hole and a blade positioning surface. A standard screw passes through the waist-shaped hole to install the positioning plate on the positioning plate support surface. The blade positioning boss, the blade positioning surface and the two clamping surfaces jointly clamp the groove blade.

[0016] Compared with the prior art, the advantages of the present invention are as follows:

[0017] For the groove blade grinding fixture of the present invention, a pressing plate and a clamping piece are provided. By using the conical surface fit and the shaft hole fit, combined with the positional relationship between the conical surface and the pin hole, the clamping piece is reliably connected to the pressing plate and can rotate a certain angle in the pressing plate. When the pressing plate is tightened, the two clamping surfaces of the clamping piece can automatically act on the side surface of the groove blade, that is, the two clamping surfaces can simultaneously abut against the front and rear ends of the side positioning surface of the groove blade, so as to form a stable and reliable positioning and clamping of the groove blade. Moreover, the structures of the pressing plate and the clamping piece are simple and the processing difficulty is low. Description of the Drawings

[0018] Figure 1It is a perspective view of the first embodiment of the grooved blade grinding fixture of the present invention.

[0019] Figure 2 It is the front view of the base in the first embodiment of the grooved blade grinding fixture of the present invention.

[0020] Figure 3 It is the side view of the base in the first embodiment of the grooved blade grinding fixture of the present invention.

[0021] Figure 4 It is the front view of the positioning plate in the first embodiment of the grooved blade grinding fixture of the present invention.

[0022] Figure 5 It is the top view of the pressing plate in the first embodiment of the grooved blade grinding fixture of the present invention.

[0023] Figure 6 Figure 5 The M-M view of

[0024] Figure 7 It is the top view of the clamping piece in the first embodiment of the grooved blade grinding fixture of the present invention.

[0025] Figure 8 It is Figure 7 The N-N view of

[0026] Figure 9 It is a schematic diagram of the grooved blade.

[0027] Figure 10 It is the top view of the pressing plate in the second embodiment of the grooved blade grinding fixture of the present invention.

[0028] Figure 11 It is Figure 10 The P-P view of

[0029] Figure 12 It is the front view of the clamping piece in the second embodiment of the grooved blade grinding fixture of the present invention.

[0030] Figure 13 It is the top view of the clamping piece in the second embodiment of the grooved blade grinding fixture of the present invention.

[0031] Figure 14 It is Figure 13 The Q-Q view of

[0032] Each label in the figure represents:

[0033] 1. Base; 11. Positioning plate support surface; 12. Blade positioning boss; 13. Relief surface; 2. Positioning plate; 21. Kidney-shaped hole; 22. Blade positioning surface; 3. Clamping piece; 31. Clamping cone surface; 32. Clamping bottom surface; 33. Pin hole; 34. Clamping surface; 35. Clamping relief surface; 4. Pressure plate; 41. Installation part; 42. Working part; 421. Cone surface; 422. Support plane; 423. Pin column; 424. Limit platform; 425. Limit surface; 426. Process relief surface; 9. Groove blade. Detailed implementation mode

[0034] The following will further elaborate on the present invention in conjunction with the accompanying drawings of the specification and specific embodiments.

[0035] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "horizontal", "inner", "outer", "top", "bottom", etc. indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0036] Figures 1 to 9The first embodiment of the grooved blade grinding fixture of the present invention is shown. The grooved blade grinding fixture includes a base 1, a positioning plate 2, a clamping piece 3 and a pressing plate 4. The positioning plate 2 is fixedly installed on the base 1 and cooperates with the base 1 to form a receiving cavity for the grooved blade 9. The clamping piece 3 includes a clamping conical surface 31, a clamping bottom surface 32, a pin hole 33 and two clamping surfaces 34. The pressing plate 4 includes a mounting portion 41 and a working portion 42. The mounting portion 41 is used to mount the pressing plate 4 on the machine tool clamping mechanism so that the machine tool clamping mechanism can drive the pressing plate 4 to rotate and press the clamping piece 3. The working portion 42 is provided with a conical surface 421, a supporting plane 422 and a pin 423. The pin 423 is arranged on the supporting plane 422 and is coaxial with the conical surface 421. The clamping piece 3 is arranged between the side positioning surface of the grooved blade 9 and the pressing plate 4. The clamping bottom surface 32 is placed on the supporting plane 422. The clamping conical surface 31 cooperates with the conical surface 421, and the pin hole 33 has a clearance fit with the pin 423. When the pressing plate 4 rotates and drives the clamping piece 3 to clamp the grooved blade 9, the clamping piece 3 can rotate around the axis of the clamping conical surface 31 so that the two clamping surfaces 34 respectively abut against the front and rear ends of the side positioning surface of the grooved blade 9. By using the conical surface fit between the clamping conical surface 31 and the conical surface 421 and the shaft-hole fit between the pin hole 33 and the pin 423, combined with the positional relationship between the conical surface and the pin hole, the clamping piece 3 is reliably connected to the pressing plate 4 and can rotate a certain angle in the pressing plate 4. When the pressing plate 4 is pressed, the two clamping surfaces 34 of the clamping piece 3 can automatically act on the side surface of the grooved blade 9, that is, the two clamping surfaces 34 can simultaneously abut against the front and rear ends of the side positioning surface of the grooved blade, so as to form a stable and reliable positioning and clamping for the grooved blade 9. When the clamping piece 3 clamps the grooved blade 9, the reaction force of the grooved blade 9 received by the clamping piece 3 is balanced by the horizontal component force of the conical surface 421 of the pressing plate 4, and the conical surface 421 generates a vertically downward component force, ensuring that the clamping piece 3 is in balanced force, stable and reliable state in the pressing plate 4. Moreover, the structures of the pressing plate 4 and the clamping piece 3 are simple and the processing difficulty is low, reducing the use cost of the grooved blade grinding fixture.

[0037] In this embodiment, the working portion 42 includes a limiting platform 424 and two limiting surfaces 425. The conical surface 421 is arranged on the side wall of the limiting platform 424, and the two limiting surfaces 425 are respectively arranged on both sides of the conical surface 421. The rotation angle of the clamping piece 3 is limited by the two limiting surfaces 425 to improve the clamping stability of the clamping piece 3 on the grooved blade 9.

[0038] In this embodiment, the cone angle of the conical surface 421 is α and the circular arc central angle is A, and it should satisfy: 2° < α ≤ 425°, 60° ≤ A ≤ 90°, so as to ensure that the clamping piece 3 can be smoothly installed into the working portion 42 of the pressing plate 4 during installation, and ensure the combined arc length of the clamping conical surface 31 and the conical surface 421, improve the support stability of the pressing plate 4 on the clamping piece 3, and ensure that the clamping bottom surface 32 closely adheres to the supporting plane 422 during work, and ensure that the conical surface fit structure has sufficient strength. Specifically, in this embodiment, α = 10°, A = 85°.

[0039] In this embodiment, a process clearance surface 426 is provided between the conical surface 421 and the support plane 422, as Figure 6 shown: The height of the conical surface 421 is L2, the effective height between the conical surface 421 and the support plane 422 is L3, and L3 < L2, thus ensuring that the conical surface 421 above the support plane 422 is a complete conical surface and ensuring the bonding area between the clamping conical surface 31 and the conical surface 421, improving the clamping stability of the groove blade 9. Specifically, in this embodiment, L2 = 3.5 mm and L3 = 3 mm.

[0040] In this embodiment, the cone angle of the clamping conical surface 31 is γ, the arc radius of the clamping conical surface 31 is R2, and the arc radius of the conical surface 421 is R1. It should satisfy: γ = α and R1 = R2, thus ensuring the stability of the cooperation between the clamping conical surface 31 and the conical surface 421.

[0041] In this embodiment, the width of the clamping piece 3 is L4, the thickness is L5, and the chord length of the arc of the conical surface 421 is L1. It should satisfy: L4 = L1 and L5 = L3 to ensure a larger cooperation area between the clamping conical surface 31 and the conical surface 421. Specifically, in this embodiment, L1 = L4 = 4.2 mm and L5 = 3 mm.

[0042] In this embodiment, the two limiting surfaces 425 are symmetrically distributed and there is an included angle β between them. It should satisfy: 5° ≤ β ≤ 30°. Then the rotation angle range of the clamping piece 3 is 2β. In this embodiment, β = 10°, and the rotation angle range of the clamping piece 3 is 20°. The height of the limiting surface 425 is L6. It should satisfy: 0.2L3 ≤ L6 ≤ 0.33L3. Specifically, L6 = 0.5 mm.

[0043] In this embodiment, the diameter of the pin hole 33 is D, and the diameter of the pin 423 is d. It should satisfy: L6 * Tanα < 0.5 * (D - d) < (L3 - L6) * Tanα to ensure that when pressing the groove blade 9, the clamping conical surface 31 and the conical surface 421 are in surface contact rather than line contact. Specifically, in this embodiment, D = 2.5 mm and d = 2.3 mm.

[0044] In this embodiment, a clamping clearance surface 35 is provided between the two clamping surfaces 34. The clamping clearance surface 35 ensures the space for the manipulator to clamp the groove blade 9 and can also avoid the unevenness of the side positioning surface of the groove blade 9.

[0045] In this embodiment, the base 1 is provided with a positioning plate support surface 11, a blade positioning boss 12, and a clearance surface 13. The positioning plate 2 is provided with a waist-shaped hole 21 and a blade positioning surface 22. The standard screw passes through the waist-shaped hole 21 to install the positioning plate 2 on the positioning plate support surface 11. The blade positioning boss 12, the blade positioning surface 22, and the two clamping surfaces 34 jointly clamp the groove blade 9.

[0046] Figures 10 to 14 The second embodiment of the grooving blade grinding fixture of the present invention is shown. The difference between this embodiment and the first embodiment is that in this embodiment, the limiting surface 425 of the pressing plate 4 forms an angle θ with the supporting plane 422, and 60° ≤ θ < 90°. The clamping bottom surface of the clamping piece 3 forms an angle Φ with the clamping side surface, and Φ = θ. It is ensured that when the clamping piece 3 is at the limit position of rotation in the working part 42 of the pressing plate 4, both the clamping conical surface 31 and the clamping side surface of the clamping piece 3 are subjected to the downward limiting action of the pressing plate 4, and both the clamping surface 34 and the clamping clearance surface 35 of the clamping piece 3 are curved surfaces. The second embodiment can meet the use functions of the present invention, with only differences in manufacturing and processing, and the rest are the same, so they will not be elaborated here.

[0047] Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above, or modify it into an equivalent embodiment with equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the technical solution of the present invention shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. A groove blade grinding fixture, characterized in that: It includes a base (1), a positioning plate (2), a clamping piece (3) and a pressing plate (4). The positioning plate (2) is fixedly installed on the base (1) and cooperates with the base (1) to form a receiving cavity for a groove blade (9). The clamping piece (3) includes a clamping conical surface (31), a clamping bottom surface (32), a pin hole (33) and two clamping surfaces (34). The pressing plate (4) includes a mounting portion (41) and a working portion (42). The mounting portion (41) is used to mount the pressing plate (4) on a machine tool clamping mechanism so that the machine tool clamping mechanism can drive the pressing plate (4) to rotate and press the clamping piece (3). The working portion (42) is provided with a conical surface (421), a supporting plane (422) and a pin post (423). The pin post (423) is arranged on the supporting plane (422) and is coaxial with the conical surface (421). The clamping piece (3) is arranged between the side positioning surface of the groove blade (9) and the pressing plate (4). The clamping bottom surface (32) is placed on the supporting plane (422). The clamping conical surface (31) cooperates with the conical surface (421). The pin hole (33) and the pin post (423) are in clearance fit. When the pressing plate (4) rotates and drives the clamping piece (3) to clamp the groove blade (9), the clamping piece (3) can rotate around the axis of the clamping conical surface (31) so that the two clamping surfaces (34) respectively abut against the front and rear ends of the side positioning surface of the groove blade (9).

2. The grooved blade grinding fixture according to claim 1, wherein: The working portion (42) includes a limiting platform (424) and two limiting surfaces (425). The conical surface (421) is arranged on the side wall of the limiting platform (424). The two limiting surfaces (425) are respectively arranged on both sides of the conical surface (421).

3. The grooved blade grinding fixture according to claim 1 or 2, characterized in that: The cone angle of the conical surface (421) is α and the circular arc central angle is A, and it should satisfy: 2° < α ≤ 425°, 60° ≤ A ≤ 90°.

4. The slot blade grinding fixture according to claim 3, wherein: A process clearance surface (426) is arranged between the conical surface (421) and the supporting plane (422). The height of the conical surface (421) is L2. The effective height between the conical surface (421) and the supporting plane (422) is L3, and L3 < L2.

5. The slot blade grinding fixture according to claim 3, characterized in that: The cone angle of the clamping conical surface (31) is γ, the circular arc radius of the clamping conical surface (31) is R2, and the circular arc radius of the conical surface (421) is R1, and it should satisfy: γ = α, R1 = R2.

6. The slot blade grinding fixture according to claim 4, wherein: The width of the clamping piece (3) is L4 and the thickness is L5. The circular arc chord length of the conical surface (421) is L1, and it should satisfy: L4 = L1, L5 = L3.

7. The grooved blade grinding fixture according to claim 4, wherein: The two limiting surfaces (425) are symmetrically distributed and there is an included angle β between them, and it should satisfy: 5° ≤ β ≤ 30°. The height of the limiting surface (425) is L6, and it should satisfy: 0.2L3 ≤ L6 ≤ 0.33L3.

8. The grooved blade grinding fixture according to claim 7, characterized in that: The diameter of the pin hole (33) is D and the diameter of the pin post (423) is d, and it should satisfy: L6 * Tanα < 0.5 * (D - d) < (L3 - L4) * Tanα.

9. The slot blade grinding fixture according to claim 1 or 2, characterized in that: A clamping clearance surface (35) is arranged between the two clamping surfaces (34).

10. The grooved blade grinding fixture according to claim 1 or 2, characterized in that: The base (1) is provided with a positioning plate support surface (11), a blade positioning boss (12) and a clearance surface (13). The positioning plate (2) is provided with a waist-shaped hole (21) and a blade positioning surface (22). A standard screw passes through the waist-shaped hole (21) to mount the positioning plate (2) on the positioning plate support surface (11). The blade positioning boss (12), the blade positioning surface (22) and two clamping surfaces (34) jointly clamp the groove blade (9).

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