An integrated fixture for top hammer and cylindrical grinding
The integrated fixture for the top hammer outer cylindrical grinding machine, with its mechanical clamping structure, enables automatic centering and precise adjustment of the top hammer workpiece. This solves the problems of long glue curing time and difficult centering in traditional clamping methods, thereby improving production efficiency and yield.
Patent Information
- Application Number
- CN202521597873.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-30
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-07-30
AI Technical Summary
Traditional top hammer workpiece clamping methods suffer from problems such as long glue curing time, difficulty in removing the pressure head, difficulty in centering, and uneven machining allowance, resulting in a high product scrap rate.
The front and rear chucks are fixed by detachable connectors, combined with a mechanical clamping structure, to achieve automatic centering and precise adjustment of the workpiece, eliminating the need for adhesive bonding.
It improves clamping efficiency and product qualification rate, reduces accuracy errors, and lowers production costs.
Smart Images
Figure CN224674478U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of top hammer machining technology, specifically to an integrated fixture for top hammer external cylindrical grinding. Background Technology
[0002] The top hammer is a key component in the machining of high-hardness products such as synthetic diamonds. In typical manufacturing processes, the rough blank of the top hammer is formed by powder sintering, followed by grinding to improve its geometric accuracy and surface finish. During the grinding of the outer cylindrical surface of the top hammer, a fixture is required to hold both ends of the workpiece. Traditionally, two pressure heads are glued to both ends of the top hammer, but this method has several problems: the glue has a long curing time, requiring a large number of pressure heads per batch to compensate for insufficient bonding time; due to the glue bonding, the pressure heads are difficult to remove after machining; furthermore, centering the pressure heads is difficult, and if the bonding position is off-center, it will lead to uneven machining allowance, increasing the product scrap rate. Utility Model Content
[0003] The purpose of this utility model is to provide an integrated fixture for top hammer external cylindrical grinding.
[0004] To achieve the above objectives, the present invention adopts the following technical solution: an integrated fixture for a top hammer external cylindrical grinding, comprising a front chuck, a rear chuck, a first connecting member, and a second connecting member. The front chuck and the rear chuck are arranged opposite to each other, and the first connecting member and the second connecting member are detachably fixedly connected. The front chuck is rotatably connected to the first connecting member, and the rear chuck is rotatably connected to the second connecting member. The rotating shafts of the front chuck and the rear chuck are coaxially arranged. A front center hole is provided at the center of the end of the front chuck facing away from the rear chuck, and a rear center hole is provided at the center of the end of the rear chuck facing away from the front chuck.
[0005] The fixture is rotatably mounted between the two centers of an external grinding machine through two center holes. The workpiece is clamped between the front chuck and the rear chuck. The first and second connecting parts ensure that the rotation axes of the front chuck and the rear chuck remain coaxial, improving assembly efficiency.
[0006] Preferably, the front chuck includes a first section, a second section, and a third section with progressively increasing diameters along its axial direction. The first section is connected to the first connector via a bearing to achieve low-resistance rotation. The third section has a plurality of circumferentially spaced clamping blocks at one end facing the rear chuck. The inner inclined surface of the clamping block fits against the inclined surface of the top hammer workpiece, thereby achieving self-centering clamping.
[0007] Preferably, the rear chuck includes a first rear chuck section, a second rear chuck section, and a third rear chuck section along its axial direction; the first rear chuck section faces the front chuck; the second rear chuck section has a gradually decreasing diameter, with its largest diameter end connected to and equal to the diameter of the first rear chuck section, and its smallest diameter end connected to and larger than the diameter of the third rear chuck section; the second rear chuck section forms a bearing clearance space to prevent the outer ring of the bearing from contacting the rear chuck and causing frictional loss; the third rear chuck section is connected to the second connecting member via a bearing to achieve low-resistance rotation.
[0008] Preferably, the first section of the rear chuck has a circular groove at the center of the end face of the front chuck, and a rubber pad is provided in the circular groove. The rubber pad has a central hole to enhance the fit. The rubber pad fits against the bottom surface of the top hammer workpiece, which can enhance the friction between the clamp and the bottom surface of the top hammer workpiece and enhance the clamping stability.
[0009] Preferably, both the first connector and the second connector are L-shaped; the end of the first connector used to connect with the front chuck and the end of the second connector used to connect with the rear chuck are provided with annular bearing mounting structures. The end of the first connector without bearing and the end of the second connector without bearing are connected to each other. The first connector and the second connector form an adjustable rigid frame to fix the front chuck and the rear chuck together, ensuring coaxiality and avoiding the workpiece mounting area of the top hammer.
[0010] Preferably, the side of the first connector without the bearing installed has a longitudinal groove, and multiple waist-shaped holes are spaced apart in the longitudinal groove to achieve fine adjustment of the chuck spacing; the side of the second connector without the bearing installed has a longitudinal strip-shaped protrusion, which matches the longitudinal groove. The longitudinal strip-shaped protrusion and the longitudinal groove can keep the front chuck and the rear chuck on the same axis, while supporting the adjustment of the spacing between the chucks; multiple threaded holes are spaced apart on the longitudinal strip-shaped protrusion; the waist-shaped holes and the threaded holes are connected by fasteners to achieve a detachable fixed connection.
[0011] Preferably, the number of threaded holes on the side of the second connector is greater than the number of waist-shaped holes on the side of the first connector, and the length of the waist-shaped holes is not less than the sum of the spacing of the threaded holes on the side of the first connector and twice the diameter of the threaded holes, to ensure that the bolt position can be continuously adjusted.
[0012] Preferably, the end face of the second connector that connects to the first connector is provided with a threaded hole; the middle part of the first connector is provided with a through hole; the through hole and the threaded hole on the end face of the second connector are connected by a fastener; the threaded hole on the end face is perpendicular to the threaded hole on the side, so as to achieve fixation in different directions and enhance the reliability of the connection.
[0013] Preferably, the end of the front chuck facing away from the rear chuck is also fitted with a dial ring for transmitting torque force, which facilitates the transmission of unidirectional torque force.
[0014] This fixture replaces traditional adhesive bonding with a mechanical clamping structure. The shape of the front chuck and the connecting piece between the two chucks ensure automatic alignment of the workpiece with the top hammer, avoiding accuracy errors caused by manual alignment deviations. The connection between the first and second connecting pieces uses a combination of multi-threaded holes and oblong holes to achieve precise and continuous adjustment of the clamping distance. Bidirectional fixing provides a more stable and reliable rigid connection. The overall solution significantly improves clamping efficiency and product qualification rate. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of an integrated fixture for an external cylindrical grinding wheel with a top hammer according to the present invention; Figure 2 This is a cross-sectional view of an integrated fixture for an external cylindrical grinding wheel with a top hammer according to the present invention; Figure 3 This is a schematic diagram of the front chuck of this utility model.
[0016] 1-Top hammer workpiece, 2-Front chuck, 201-First section of front chuck, 202-Second section of front chuck, 203-Third section of front chuck, 204-Front center hole, 3-Rear chuck, 301-First section of rear chuck, 302-Second section of rear chuck, 303-Third section of rear chuck, 304-Rear center hole, 4-First connecting piece, 5-Second connecting piece, 6-First bearing, 7-Second bearing, 8-Dial ring, 9-Rubber pad. Detailed Implementation
[0017] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.
[0018] like Figures 1-2 As shown, an integrated fixture for a top hammer external cylindrical grinder includes a front chuck 2, a rear chuck 3, a first connecting member 4, a second connecting member 5, a first bearing 6, a second bearing 7, a dial ring 8, and a rubber pad 9. The front chuck 2 and the rear chuck 3 are arranged opposite to each other, and the top hammer workpiece 1 is disposed between the front chuck 2 and the rear chuck 3, with the front chuck 2 and the rear chuck 3 respectively clamping the top and bottom ends of the top hammer workpiece 1.
[0019] The top hammer workpiece 1 comprises a small truncated square, a large truncated square, and a frustum of a cone. The top of the top hammer workpiece 1 is a small truncated square with a square top surface. The sides of the small truncated square are four single-layered inclined surfaces with a small inclination angle. The bottom of the small truncated square is connected to a large truncated square, and the sides of the large truncated square are four double-layered inclined surfaces with a larger inclination angle. The lower part of the large truncated square is connected to a frustum of a cone. The outer diameter of the frustum of a cone gradually decreases from the end connected to the large truncated square to the other end, forming a taper of 1°-2°. The top end of the top hammer workpiece 1 refers to the end with the inclined surface, and the bottom end of the top hammer workpiece 1 refers to the end without the inclined surface.
[0020] like Figure 2 and Figure 3 As shown, the front chuck 2 is integrally formed and divided into three sections along the axial direction. The first section 201 of the front chuck has a smaller diameter and is located at the end of the front chuck 2, used to install the first bearing 6. The second section 202 of the front chuck has a slightly larger diameter than the first section 201, but smaller than the outer ring diameter of the first bearing 6. It serves as a transition section to ensure that the outer ring of the first bearing 6 maintains a gap with the front chuck 2, reducing friction loss. The third section 203 of the front chuck has the largest diameter and has four clamping blocks spaced apart at one end facing the rear chuck 3. The four clamping blocks are centrally symmetrical about the axis of the front chuck 2 and are at 90-degree angles to each other. The inner side of the clamping blocks is an inclined surface that fits against the double-layered inclined surface of the top hammer workpiece 1. A receiving cavity is formed between the four clamping blocks to accommodate the top of the top hammer workpiece 1. A front center hole 204 is provided at the center of the end of the first section 201 of the front chuck.
[0021] The rear chuck 3 is integrally molded and divided into three sections along the axial direction. The first section 301 is a cylinder, the second section 302 is a frustum, and the third section 303 is a cylinder with a smaller diameter than the first section 301. The three sections of the rear chuck 3 are connected sequentially. The larger diameter side of the second section 302 connects to the first section 301, and the smaller diameter side connects to the third section 303. The smaller diameter side of the second section 302 has a diameter slightly larger than the third section 303, but smaller than the outer ring diameter of the second bearing 7. A shallow circular groove is machined in the center of the end face of the first section 301 facing the front chuck 2. A rubber pad 9 is attached to this groove. The rubber pad 9 is a circular sheet of rubber with a central hole. The third section 303 is used to mount the second bearing 7, and a rear center hole 304 is located at the center of its end. The front center hole 204 and the rear center hole 304 are coaxial.
[0022] Both the first connector 4 and the second connector 5 are L-shaped structures. One end of the first connector 4 has an annular bearing mounting structure, which fits over the first bearing 6. The front chuck 2 is rotatably mounted on one end of the first connector 4 via the first bearing 6. The other end of the first connector 4 has a longitudinal groove on its side, within which multiple oblong holes are spaced apart. Similarly, one end of the second connector 5 has an annular bearing mounting structure, which fits over the second bearing 7. The rear chuck 3 is rotatably mounted on one end of the second connector 5 via the second bearing 7. The other end of the second connector 5 has a longitudinal strip-shaped protrusion on its side, the shape of which matches the longitudinal groove of the first connector 4. Multiple threaded holes are spaced apart on the longitudinal strip-shaped protrusion; the number of threaded holes is greater than the number of oblong holes. In this embodiment, the number of threaded holes is twice the number of oblong holes. The length of the oblong holes is greater than the sum of the spacing between adjacent threaded holes and twice the diameter of the threaded holes. Bolts are screwed into the threaded holes of the second connector 5 through the oblong holes of the first connector 4, achieving a stable connection between the first connector 4 and the second connector 5. The end face of the second connector 5 that is connected to the first connector 4 is also provided with a threaded hole. The middle part of the first connector 4 is provided with a through hole at the position corresponding to the threaded hole on the end face. The bolt is screwed into the threaded hole on the end face of the first connector 4 through the through hole, so as to realize the connection between the first connector 4 and the second connector 5 in another direction.
[0023] The shift ring 8 is an open annular structure with protruding ear structures at both ends of the opening. The ear structures have opposing holes. By screwing in bolts and nuts, the shift ring 8 is fixedly sleeved on the end of the first section 201 of the front chuck. One of the two ear structures is more protruding than the other, and can be used as the input end for torque force.
[0024] In use, the top hammer workpiece 1 is first placed between the front chuck 2 and the rear chuck 3. The fixture is connected to the top hammer workpiece 1 and installed in the clamping position of the external grinding machine. The two centers of the external grinding machine are engaged with the two center holes of the fixture. The longitudinal strip protrusion of the second connecting piece 5 is kept in the longitudinal groove of the first connecting piece 4. The first connecting piece 4 and the second connecting piece 5 are moved towards each other by external force until the front chuck 2 is pressed against the top surface of the top hammer workpiece 1 and the rear chuck 3 is pressed against the bottom surface of the top hammer workpiece 1. The first connecting piece 4 and the second connecting piece 5 are fixed with multiple bolts. After installation, the torque is input through the dial ring 8 to make the fixture and the top hammer workpiece 1 it holds rotate. The grinding wheel of the grinding machine grinds the outer circular surface of the top hammer workpiece 1.
[0025] This integrated fixture for external cylindrical grinding with top hammer adopts a purely mechanical clamping structure, eliminating the need for glue bonding. The integrated design ensures automatic centering during clamping, solving the problem of difficulty in centering the pressure head and top hammer in traditional methods, and significantly improving production efficiency and yield.
[0026] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.
Claims
1. A jig for an integrated external cylindrical grinding machine with a top hammer, characterized in that, It includes a front chuck, a rear chuck, a first connector, and a second connector. The front chuck and the rear chuck are arranged opposite to each other. The first connector and the second connector are detachably fixedly connected. The front chuck is rotatably connected to the first connector, and the rear chuck is rotatably connected to the second connector. The rotation axes of the front chuck and the rear chuck are coaxially arranged. The center of the end of the front chuck facing away from the rear chuck is provided with a front center hole, and the center of the end of the rear chuck facing away from the front chuck is provided with a rear center hole.
2. The integrated fixture for external cylindrical grinding with a top hammer according to claim 1, characterized in that, The front chuck includes a first section, a second section, and a third section with progressively increasing diameters along its axial direction. The first section is connected to the first connector via a bearing. The third section has a plurality of circumferentially spaced clamping blocks at one end facing the rear chuck. The inner inclined surface of the clamping block is in contact with the inclined surface of the top hammer workpiece.
3. The integrated fixture for external cylindrical grinding with a top hammer according to claim 1, characterized in that, The rear chuck includes a first rear chuck section, a second rear chuck section, and a third rear chuck section along its axial direction; the first rear chuck section faces the front chuck; the second rear chuck section has a gradually decreasing diameter, with its largest diameter end connected to and equal to the diameter of the first rear chuck section, and its smallest diameter end connected to and larger than the diameter of the third rear chuck section; the third rear chuck section is connected to the second connecting member via a bearing.
4. The integrated fixture for external cylindrical grinding with a top hammer according to claim 3, characterized in that, The first section of the rear chuck has a circular groove at the center of the end face of the front chuck, and a rubber pad is placed in the circular groove. The rubber pad has an opening in the center.
5. The integrated fixture for external cylindrical grinding with a top hammer according to claim 1, characterized in that, Both the first connector and the second connector are L-shaped; the end of the first connector that is connected to the front chuck and the end of the second connector that is connected to the rear chuck are provided with an annular bearing mounting structure, and the end of the first connector without a bearing and the end of the second connector without a bearing are connected to each other.
6. The integrated fixture for external cylindrical grinding with a top hammer according to claim 5, characterized in that, The side of the first connector without the bearing installed has a longitudinal groove, and a plurality of waist-shaped holes are spaced apart in the longitudinal groove; the side of the second connector without the bearing installed has a longitudinal strip-shaped protrusion, which matches the longitudinal groove, and a plurality of threaded holes are spaced apart on the longitudinal strip-shaped protrusion; the waist-shaped holes and the threaded holes are connected by fasteners.
7. The integrated fixture for external cylindrical grinding with a top hammer according to claim 6, characterized in that, The number of threaded holes on the side of the second connector is greater than the number of waist-shaped holes on the side of the first connector, and the length of the waist-shaped holes is not less than the sum of the spacing of the threaded holes on the side of the first connector and twice the diameter of the threaded holes.
8. The integrated fixture for external cylindrical grinding with a top hammer according to claim 5, characterized in that, The end face of the second connector that connects to the first connector is provided with a threaded hole; the middle part of the first connector is provided with a through hole; the through hole and the threaded hole on the end face of the second connector are connected by a fastener.
9. The integrated fixture for external cylindrical grinding with a top hammer according to claim 1, characterized in that, The front chuck is further fitted with a dial ring at its end facing away from the rear chuck for transmitting torque.