Clamping fixture for machining outer circle of hard alloy holding-up hammer

Abstract

A hard alloy holding-up hammer outer circle machining clamping fixture relates to the technical field of holding-up hammer machining and comprises a profiling fixture body and a telescopic fixing plate, a plurality of profiling clamping jaws are evenly distributed at the upper end of the profiling fixture body in the circumferential direction, and the profiling clamping jaws jointly form a containing cavity. A claw head inclined face matched with the holding-up hammer large inclined face in shape is arranged on the profiling clamping claw, and a telescopic fixing plate and an adjusting assembly used for adjusting the position of the telescopic fixing plate to enable the telescopic fixing plate to be tightly attached to the holding-up hammer large inclined face are further installed at the top end of the profiling clamping claw. According to the device, the telescopic fixing plate is adjusted to make up the gap, so that the telescopic fixing plate is tightly attached to the large inclined face of the holding-up hammer, the hard alloy holding-up hammer is further fixed, the production efficiency can be effectively improved, the production and machining risk and the accident rate are reduced, and the device has the advantages of being simple in structure, convenient to operate and low in cost.

Description

Technical Field

[0001] This utility model relates to the field of top hammer machining technology, specifically a clamping fixture for machining the outer diameter of a cemented carbide top hammer. Background Technology

[0002] Carbide top hammers are an indispensable key consumable in the synthesis of superhard materials. The quality of the carbide top hammer determines the quality of the synthesized superhard materials, and the processing efficiency of the carbide top hammer also affects the price of the top hammer and the production cost of superhard materials.

[0003] The carbide top hammer structure includes a top surface, four large bevels, four small bevels, an outer circle, and a bottom surface. The top surface, four large bevels, and four small bevels are collectively referred to as the nine-face structure. During machining, the outer circle of the carbide top hammer must first be ground. Due to the special structure of the carbide top hammer, a specific clamping fixture needs to be installed on the machine tool when machining its outer circle using a longitudinally mounted grinding wheel machine. Currently, this clamping fixture typically uses a top hammer large bevel profile clamping fixture. During clamping, the carbide top hammer large bevel aligns with the top hammer large bevel profile clamping fixture, and the other end is then connected to the machine tool... The tailstock presses against the bottom surface of the carbide top hammer to achieve a fixed effect. However, currently, because the carbide top hammer blank needs to be sintered at high temperature after powder molding, the high temperature sintering will cause the four large inclined surfaces of the carbide top hammer to deform to varying degrees, that is, to collapse or warp to varying degrees. This will cause the carbide top hammer and the top hammer large inclined surface contouring fixture to not fit completely during clamping, resulting in gaps and inability to clamp securely. At this time, it is usually necessary to put shims between the carbide top hammer and the top hammer large inclined surface contouring fixture to fill the gaps and prevent the fixture from loosening.

[0004] However, the current method of using paper padding is extremely cumbersome. Moreover, the paper is wetted and thrown out by the grinding fluid when the carbide top hammer rotates at high speed, causing the top hammer clamping to loosen during processing. This leads to the carbide top hammer falling off during processing. The fallen carbide top hammer will collide and grind irregularly with the grinding wheel. This not only scraps the carbide top hammer but also damages the machine tool. Especially when processing large-sized top hammers, the clamping is more likely to loosen and cause the top hammer to fall off. This clamping method of using a large inclined plane contour jig with paper padding has low production efficiency and high production and processing risks, which can easily cause processing accidents. Utility Model Content

[0005] Based on the problems existing in the prior art, the purpose of this utility model is to propose a clamping fixture for machining the outer circle of a cemented carbide top hammer.

[0006] The technical solution adopted by this utility model is: a clamping fixture for machining the outer circle of a cemented carbide top hammer, including a contouring fixture body. The upper end of the contouring fixture body is provided with a plurality of contouring jaws evenly distributed along the circumferential direction, which together form a receiving cavity. The contouring jaws are provided with jaw head inclined surfaces adapted to the shape of the large inclined surface of the top hammer. The top of the contouring jaws is also equipped with a telescopic fixing plate and an adjustment component for adjusting the position of the telescopic fixing plate so that it fits tightly against the large inclined surface of the top hammer.

[0007] The adjustment assembly includes a limiting screw for tightening the telescopic fixing plate to adjust its position and a guide post for limiting the direction of movement of the telescopic fixing plate.

[0008] The top of the contoured claw is provided with a threaded hole and a guide hole that penetrate its outer and inner surfaces.

[0009] One end of the guide post is fixedly connected to the telescopic fixing plate, and the other end is located in the guide hole on the contour claw.

[0010] The end of the limiting screw passes through the threaded hole and presses against the surface of the telescopic fixing plate.

[0011] The limiting screw is installed in the threaded hole in a countersunk manner.

[0012] The top of the contoured claw has a groove, and the telescopic fixing plate is located in the groove, with the shape of the telescopic fixing plate matching the shape of the groove.

[0013] The telescopic fixing plate is crescent-shaped, and its outer edge is flush with the outer surface of the contour claw.

[0014] The beneficial effects of this utility model are:

[0015] This invention provides a clamping fixture for machining the outer diameter of a carbide top hammer. The device has an adjustable telescopic fixing plate mounted on the top of the contoured jaws, which conforms to the shape of the large inclined surface of the top hammer. When the four large inclined surfaces of the carbide top hammer collapse or warp to varying degrees after sintering, and when the four contoured jaws cannot fully fit with the four large inclined surfaces of the carbide top hammer, resulting in gaps and insecure fixing, the telescopic fixing plate can be adjusted to fill these gaps, ensuring a tight fit between the telescopic fixing plate and the large inclined surfaces of the top hammer, thereby further securing the carbide top hammer. This device effectively improves production efficiency, reduces production risks and accident rates, and features a simple structure, convenient operation, and low cost. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the overall fixture for machining the outer diameter of a cemented carbide top hammer;

[0018] Figure 2 Schematic diagram of telescopic fixing plate and limit screw;

[0019] Figure 3 This is a schematic diagram of the main body of the contour-following fixture;

[0020] Figure 4 This is a schematic diagram before the top hammer is clamped.

[0021] Figure 5 This is a schematic diagram showing the completion of the top hammer clamping.

[0022] Reference numerals: 1. Telescopic fixing plate; 2. Contouring clamp body; 3. Clamp positioning mounting hole; 4. Limit screw; 5. Guide post; 6. Threaded hole; 7. Guide hole; 8. Top hammer; 9. Top hammer large inclined surface; 10. Top hammer small inclined surface; 11. Gap; 12. Contouring claw; 13. Crescent groove; 14. Claw head inclined surface. Detailed Implementation

[0023] The present invention will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0024] It should be noted that, unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "a," "an," or "the," and similar words used in this utility model patent application specification and claims do not express a quantity limitation, but rather indicate the presence of at least one. Terms such as "comprising" or "including" indicate that the elements or objects preceding "comprising" encompass the elements or objects listed following "comprising" or "including" and their equivalents, but do not exclude other elements or objects having the same function.

[0025] To more clearly describe the specific structure of a cemented carbide top hammer machining outer diameter clamping fixture, combined with the attached... Figure 1 —5 is described in detail below:

[0026] This embodiment takes a model with four contouring jaws 12 as an example. As shown in the figure, a cemented carbide top hammer outer circle machining clamping fixture mainly includes a contouring fixture body 2 and a telescopic fixing plate 1. The contouring fixture body 2 includes a contouring fixture base and four contouring jaws 12 connected thereto. The contouring fixture base is provided with a fixture positioning mounting hole 3. The clamping fixture is fixedly installed on the machine tool headstock by fixing bolts passing through the fixture positioning mounting hole 3.

[0027] Before machining the outer diameter of the carbide top hammer, the top hammer 8 needs to be fixed and clamped. When clamping, the top cone of the tailstock of the machine tool presses against the bottom surface of the carbide top hammer 8 so that the four large inclined surfaces 9 of the top hammer are in contact with the four corresponding contoured jaws 12 to achieve the purpose of clamping and fixing. However, since the four large inclined surfaces 9 of the top hammer blank will undergo different degrees of deformation after sintering, specifically collapse or upturn, the four contoured jaws 12 cannot be completely in contact with the four large inclined surfaces 9 of the top hammer, and there will inevitably be a certain gap 11 between them. When the machine tool is rotated, the top hammer 8 will shake in the fixture, making it impossible to perform normal machining operations. At this time, the top hammer 8 can be reliably fixed by using the telescopic fixing plate 1.

[0028] In this embodiment, the contouring claw 12 includes a threaded hole 6, a guide hole 7, a groove, and a claw head inclined surface 14. The four contouring claws 12 are evenly distributed along the circumference and together form a receiving cavity. This receiving cavity fits with the top surface of the top hammer 8, the four small inclined surfaces 10 of the top hammer, and the four large inclined surfaces 9 of the top hammer. The top of the contouring claw 12 is provided with a threaded hole 6 and two guide holes 7, which penetrate through the outer circular surface and the inner surface of the contouring claw 12. The groove is provided on the top of the contouring claw 12, and the shape of the telescopic fixing plate 1 is adapted to the shape of the groove. The contouring claw 12 is provided with a claw head inclined surface 14, and the shape of the claw head inclined surface 14 is adapted to the shape of the large inclined surface 9 of the top hammer.

[0029] In this embodiment, the telescopic fixing plate 1 is provided with two evenly distributed guide posts 5 on the side near the contour claw 12, which are used to control the moving direction of the telescopic fixing plate 1 and prevent deviation when adjusting the position of the telescopic fixing plate 1. The guide post 5 cooperates with the guide hole 7, one end of the guide post 5 slides in the guide hole 7, and the other end is fixedly installed on the plate surface of the telescopic fixing plate 1.

[0030] In this embodiment, a limiting screw 4 is provided in the threaded hole 6 and is threadedly connected thereto. The end of the limiting screw 4 passes through the threaded hole 6 and is in contact with the mounting plate surface of the guide post 5 of the telescopic fixing plate 1. When the limiting screw 4 is tightened with an Allen wrench, the limiting screw 4 will push the telescopic fixing plate 1 to move along the direction of the guide post 5. At the same time, the guide post 5 moves linearly in the guide hole 7. When the limiting screw 4 pushes the telescopic fixing plate 1 and the large inclined surface 9 of the top hammer to fit tightly together, the tightening stops, thereby locking the position of the telescopic fixing plate 1. Finally, by adjusting the position of the four telescopic fixing plates 1, the gap 11 between the contouring claw 12 and the large inclined surface 9 of the top hammer is eliminated, thereby firmly fixing the top hammer 8. The limiting screw 4 is installed in the threaded hole 6 in a countersunk manner to avoid interference with the moving grinding wheel during the processing. The entire clamping process is safe and fast, significantly improving processing efficiency.

[0031] In this embodiment, when the top hammer 8 is clamped with the four contoured jaws 12, the top cone of the machine tool tailstock will apply a continuous clamping force to it. At the same time, when machining the outer circle of the top hammer 8, a thrust will also be applied to the top hammer 8 in the radial direction. Therefore, the force points of the four large inclined surfaces 9 of the top hammer 8 and the four contoured jaws 12 are all located at the middle position of the edge of the telescopic fixing plate 1. Therefore, it is only necessary to fix the telescopic fixing plate 1 to ensure the stable clamping of the top hammer 8.

[0032] In this embodiment, the telescopic fixing plate 1 can be crescent-shaped, with its outer edge consistent with the outer surface of the contour claw 12. At this time, the groove at the top of the contour claw 12 that is adapted to it is a crescent-shaped groove 13. The outer edge of the telescopic fixing plate 1 and the outer boundary of the crescent groove 13 are flush with the outer surface of the contour claw 12. This makes the whole more coordinated and reduces contact with other parts in subsequent processing, making the processing more stable.

[0033] The clamping process of the top hammer using the above-mentioned device is as follows:

[0034] First, fix the top hammer clamping fixture on the machine tool headstock. Then, place one end of the top hammer's large inclined surface into the receiving cavity of the top hammer clamping fixture. Next, activate the top cone of the machine tool tailstock to press against the bottom surface of the top hammer. At the same time, adjust the four large inclined surfaces of the top hammer to correspond with the four contour jaws. Finally, use tools to tighten or loosen the four limit screws to adjust the position of the telescopic fixing plate to fill the gap between the four large inclined surfaces of the top hammer and the four contour jaws, thereby firmly fixing the top hammer for subsequent machining operations.

[0035] The parts not described in detail in this embodiment are existing technologies.

[0036] It should be noted that although the present invention has been described through the above embodiments, the present invention may have other various embodiments. Without departing from the spirit and scope of the present invention, those skilled in the art can obviously make various corresponding changes and modifications to the present invention, but these changes and modifications should all fall within the scope of protection of the appended claims and their equivalents.

Claims

1. A clamping fixture for machining the outer diameter of a cemented carbide top hammer, comprising a contouring fixture body (2), characterized in that: The upper end of the contour clamp body (2) is provided with several contour claws (12) evenly distributed along the circumference, which together form a receiving cavity. The contour claws (12) are provided with claw head slopes (14) that are adapted to the shape of the top hammer large slope (9). The top of the contour claws (12) is also equipped with a telescopic fixing plate (1) and an adjustment component for adjusting the position of the telescopic fixing plate (1) to make it fit tightly against the top hammer large slope (9).

2. The carbide top hammer outer diameter machining clamping fixture according to claim 1, characterized in that: The adjustment assembly includes a limiting screw (4) for pressing the telescopic fixing plate (1) to adjust its position and a guide post (5) for limiting the direction of movement of the telescopic fixing plate (1).

3. The carbide top hammer outer diameter machining clamping fixture according to claim 2, characterized in that: The top of the contoured claw (12) is provided with a threaded hole (6) and a guide hole (7) that penetrate its outer and inner surfaces.

4. The carbide top hammer outer diameter machining clamping fixture according to claim 3, characterized in that: One end of the guide post (5) is fixedly connected to the telescopic fixing plate (1), and the other end is located in the guide hole (7) on the contour claw (12).

5. The carbide top hammer outer diameter machining clamping fixture according to claim 3, characterized in that: The end of the limiting screw (4) passes through the threaded hole (6) and presses against the surface of the telescopic fixing plate (1).

6. The carbide top hammer outer diameter machining clamping fixture according to claim 5, characterized in that: The limiting screw (4) is installed in the threaded hole (6) in a countersunk manner.

7. The carbide top hammer outer diameter machining clamping fixture according to claim 3, characterized in that: The top of the contour claw (12) is provided with a groove, and the telescopic fixing plate (1) is located in the groove and the shape of the telescopic fixing plate (1) is adapted to the shape of the groove.

8. The carbide top hammer outer diameter machining clamping fixture according to claim 7, characterized in that: The telescopic fixing plate (1) is crescent-shaped, and its outer edge is flush with the outer surface of the contour claw (12).

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