Efficient forming and grinding device

By designing a high-efficiency molding and grinding device including a fixed load bearing plate, a clamping rotary rod, a workpiece clamping plate, a limit adjustment rod and a workpiece limit plate, the problems of unstable workpiece clamping and excessive reduction of the grinding disc in the prior art are solved, and a more efficient and precise grinding effect is achieved.

CN222891012UActive Publication Date: 2025-05-23QUZHOU JIACHENG METAL PRODUCTS CO LTD
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Patent Information

Application Number
CN202421740845.X
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-07-23
Publication Date
2025-05-23
Estimated Expiration
2034-07-23

AI Technical Summary

Technical Problem

The existing high-efficiency molding and grinding devices have the problem that the clamping structure cannot stably clamp the workpiece, and the grinding disc lacks limiting measures, resulting in uneven grinding.

Method used

An efficient forming and grinding device including a fixed load bearing plate, a clamping rotary rod, a workpiece clamping plate, a limit adjustment rod and a workpiece limit plate is designed. Through the combination of these components, the workpiece is stable clamping and the limit of the lowering distance of the grinding disc is achieved.

Benefits of technology

It effectively solves the problems of unstable workpiece clamping and excessive grinding of grinding discs, and improves the accuracy and consistency of grinding.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides an efficient forming and polishing device, which relates to the technical field of polishing and comprises a device body. The device body is provided with a fixed bearing plate in the left-right direction, a strip-shaped hole vertically penetrating in the left-right direction is formed in the front of the middle of the fixed bearing plate, a rectangular hole vertically penetrating in the front-back direction is formed in the middle of the rear portion of the fixed bearing plate, and threaded holes vertically penetrating are formed in the left side and the right side of the middle of the rear end of the fixed bearing plate. A bearing plate with a front-back penetrating threaded hole is arranged on the bottom end face of the rear end of a rectangular hole of a fixed bearing plate, and vertical plates in the front-back direction are arranged at the left end and the right end of the bottom end face of the fixed bearing plate correspondingly, so that a workpiece limiting plate is conveniently installed on the fixed bearing plate through a limiting adjusting rod, and the rear end face of a workpiece is conveniently limited through the workpiece limiting plate; the problems that a clamping structure of the device cannot enable a to-be-polished workpiece to be located under a polishing disc all the time, and it is inconvenient to add adjusting measures on the device to enable the to-be-polished workpiece to be located under the polishing disc all the time are solved.
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Description

Technical Field

[0001] The utility model belongs to the technical field of grinding, and in particular relates to a high-efficiency forming grinding device. Background Art

[0002] Grinding is a type of surface modification technology. It generally refers to a processing method that uses rough objects to change the physical properties of the material surface through friction. The main purpose is to obtain a specific surface roughness. Forming grinding means that the finished workpiece needs to be processed into a specific shape by grinding. It is a precision grinding method that uses a grinding wheel of a specific shape to process the workpiece into the required shape and size.

[0003] Based on the above, the inventors found that the existing high-efficiency molding and grinding devices have the following shortcomings:

[0004] 1. The clamping structure of the device cannot keep the workpiece to be polished directly under the polishing disc all the time, and it is not convenient to add adjustment measures to the device to keep the workpiece to be polished directly under the polishing disc all the time;

[0005] 2. If there is no limiting measure for the final descending distance of the grinding disc, it is easy to over-grind and it is not convenient to add limiting measures on the device to limit the final descending distance of the grinding disc. Utility Model Content

[0006] In order to solve the above-mentioned technical problems, the utility model provides a high-efficiency forming and grinding device to solve the problems that the clamping structure of the existing device cannot make the workpiece to be grinded always be directly below the grinding disk, and it is not convenient to add adjustment measures on the device to make the workpiece to be grinded always be directly below the grinding disk; the final descending distance of the grinding disk of the device does not have any limiting measures, which makes it easy to descend and grind excessively, and it is not convenient to add limiting measures on the device to limit the final descending distance of the grinding disk of the device.

[0007] The purpose and effect of the high-efficiency forming and grinding device of the utility model are achieved by the following specific technical means:

[0008] A high-efficiency forming and grinding device comprises a device body; the device body is provided with a fixed supporting plate in the left and right directions, a strip hole penetrating from top to bottom in the left and right directions is opened in the middle front of the fixed supporting plate, a rectangular hole penetrating from top to bottom in the front and back directions is opened in the middle of the rear of the fixed supporting plate, threaded holes penetrating from top to bottom are opened on the left and right sides of the middle of the rear end of the fixed supporting plate, a supporting plate with threaded holes penetrating from top to bottom is provided on the bottom end face of the rear end of the rectangular hole of the fixed supporting plate, vertical plates in the front and back directions are provided on the left and right ends of the bottom end face of the fixed supporting plate, a bearing hole penetrating from top to bottom is opened in the middle front of the vertical plate of the fixed supporting plate, a fixed plate with holes penetrating from top to bottom at both ends is provided on the bottom of the inner end face of the vertical plate of the fixed supporting plate, a clamping rotating rod in the left and right directions is installed between the bearing holes of the fixed supporting plate through bearings, and the outer circumferences on the left and right sides of the clamping rotating rod A thread with opposite rotation directions is provided, and fixed columns are provided on the left and right end faces of the clamping rotating rod, and a regular hexagonal prism is provided on the outer end face of the fixed column of the clamping rotating rod, and workpiece clamping plates in the front and rear directions are installed through threads on the outer circumferences of the left and right sides of the clamping rotating rod, and a clamping plate in the front and rear directions is provided on the upper part of the workpiece clamping plate, and an insertion plate with left and right threaded holes is provided in the middle of the bottom end face of the clamping plate of the workpiece clamping plate, and a limit adjustment rod in the front and rear directions is installed through threads inside the bearing plate of the fixed bearing plate, and threads are provided on the outer circumference of the limit adjustment rod, and a regular hexagonal prism is provided on the rear end face of the limit adjustment rod, and a fixed column is provided on the front end face of the limit adjustment rod, and the workpiece limit plates in the left and right directions are installed on the fixed column of the limit adjustment rod through bearings, and the workpiece limit plate is a T-shaped plate structure as a whole, and a bearing circular groove is provided at the bottom of the rear end face of the workpiece limit plate.

[0009] Furthermore, a shaped grinding disc is inserted into the regular hexagonal groove of the grinding motor and fixed by bolts, a regular hexagonal prism is arranged in the center of the top end face of the shaped grinding disc in the up and down directions, and a threaded hole is opened in the middle of the regular hexagonal prism of the shaped grinding disc to penetrate front and back.

[0010] Furthermore, a grinding motor in the up and down directions is installed by bolts in the front middle of the top end surface of the lifting and moving plate, a fixed ring plate with upper and lower through holes is arranged on the outer circumference of the bottom of the grinding motor, a regular hexagonal groove is provided on the end surface of the shaft extending from the bottom of the grinding motor, and a through hole in the front and rear directions is provided on the front wall of the regular hexagonal groove of the grinding motor.

[0011] Furthermore, a descent limit rod in the up-and-down direction is installed inside the lifting screw hole of the lifting movable plate, a thread is provided on the outer circumference of the descent limit rod, and a regular hexagonal prism is provided on the top end face of the descent limit rod.

[0012] Furthermore, a lifting and moving plate in the front and rear directions is installed with threads on the outer circumference of the lifting and adjusting rod, an insertion plate with threaded holes passing through the upper and lower parts is arranged in the middle of the rear end surface of the lifting and moving plate, a lifting screw hole passing through the upper and lower parts is opened in the middle of the front end of the lifting and moving plate, a through hole passing through the upper and lower parts is opened in the front middle of the lifting and moving plate, and six fixing screw holes passing through the upper and lower parts are opened in a circular array outside the through hole of the lifting and moving plate.

[0013] Furthermore, a lifting adjustment rod is installed in the up and down directions between the horizontal plate and the fixed plate of the lifting load plate through a bearing, a thread is provided on the outer circumference of the lifting adjustment rod, fixed columns are provided on the upper and lower end surfaces of the lifting adjustment rod, and a regular hexagonal prism is provided on the upper end of the lifting adjustment rod.

[0014] Furthermore, a lifting bearing plate is installed in the upper and lower directions by bolts in the middle of the rear end of the top end face of the fixed bearing plate, a strip hole is opened in the middle of the lifting bearing plate and runs through the upper and lower directions from front to back, a horizontal plate with upper and lower through holes is arranged in the middle at the top of the rear end face of the lifting bearing plate, a fixed plate with upper and lower through holes is arranged in the middle at the bottom of the rear end face of the lifting bearing plate, and fixing holes running through the upper and lower directions are opened at both the left and right ends of the fixed plate of the lifting bearing plate.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] It is convenient to install the workpiece limit plate on the fixed supporting plate through the limit adjustment rod, and it is convenient to limit the rear end face of the workpiece through the workpiece limit plate, which solves the problem that the clamping structure of the device cannot always make the workpiece to be polished directly under the polishing disk, and it is not convenient to add adjustment measures on the device to make the workpiece to be polished always directly under the polishing disk.

[0017] The descending limit rod is conveniently installed on the lifting and moving plate through threads for lifting and lowering adjustment, and the final descending distance of the lifting and moving plate is conveniently limited by the descending limit rod, which solves the problem that there is no limiting measure for the final descending distance of the grinding disc of the device, and it is easy to descend and grind excessively, and it is inconvenient to add limiting measures on the device to limit the final descending distance of the grinding disc of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a main structural schematic diagram of the utility model.

[0019] Figure 2 It is a rear view structural schematic diagram of the utility model.

[0020] Figure 3 It is a schematic diagram of the structure of the utility model when viewed from above.

[0021] Figure 4 It is a cross-sectional structural schematic diagram of the utility model.

[0022] Figure 5 It is a schematic diagram of the disassembled structure of the utility model.

[0023] Figure 6 It is a top view schematic diagram of the fixed bearing plate of the utility model.

[0024] In the figure: 1. Device body; 2. Fixed bearing plate; 3. Clamping rotating rod; 4. Workpiece clamping plate; 5. Limit adjustment rod; 6. Workpiece limit plate; 7. Lifting bearing plate; 8. Lifting adjustment rod; 9. Lifting movable plate; 10. Lowering limit rod; 11. Grinding motor; 12. Forming grinding disc. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings and examples.

[0026] Embodiment 1:

[0027] As attached Figure 1 To Attachment Figure 6 As shown:

[0028] The utility model provides an efficient forming and grinding device, including a device body 1; the device body 1 is provided with a fixed bearing plate 2 in the left and right directions, which is convenient for carrying various components; a strip hole that runs through the left and right directions up and down is opened in the middle front of the fixed bearing plate 2, which is convenient for the workpiece clamping plate 4 to be inserted into the moving guide; a rectangular hole that runs through the front and back directions up and down is opened in the middle of the rear of the fixed bearing plate 2, which is convenient for the workpiece limiting plate 6 to be inserted into the moving guide; threaded holes that run through up and down are opened on both sides of the middle of the rear end of the fixed bearing plate 2, which is convenient for the lifting bearing plate 7 to be installed by bolts; a bearing plate with threaded holes that run through the front and back is provided on the bottom end surface of the rear end of the rectangular hole of the fixed bearing plate 2, which is convenient for limiting The position adjustment rod 5 is installed through threads, and vertical plates in the front and rear directions are provided at both ends of the bottom end surface of the fixed bearing plate 2, which is convenient for forming a placement cavity at the bottom. Bearing holes that penetrate left and right are opened in the middle front of the vertical plate of the fixed bearing plate 2, which is convenient for the clamping and rotating rod 3 to be installed through the bearing. A fixing plate with upper and lower through holes at both ends is provided at the bottom of the inner end surface of the vertical plate of the fixed bearing plate 2, which is convenient for fixing by bolts. A clamping and rotating rod 3 in the left and right directions is installed between the bearing holes of the fixed bearing plate 2 through bearings, which is convenient for the clamping and rotating rod 3 to rotate. The outer circumferences on the left and right sides of the clamping and rotating rod 3 are provided with threads with opposite rotation directions, which is convenient for the workpiece clamping plate 4 to move synchronously inward and outward through thread engagement, and the clamping The left and right end faces of the rotating rod 3 are both provided with fixed columns, which are convenient for installation through bearings. The outer end faces of the fixed columns that clamp the rotating rod 3 are provided with regular hexagonal prisms, which are convenient for rotation through tools. The outer circumferences on both sides of the clamping rotating rod 3 are both threadedly installed with workpiece clamping plates 4 in the front and rear directions, which are convenient for the workpiece clamping plates 4 to move synchronously inward and outward through threaded engagement. The upper part of the workpiece clamping plate 4 is provided with a clamping plate in the front and rear directions, which is convenient for clamping the workpiece. An insertion plate with left and right threaded holes is provided in the middle of the bottom end face of the clamping plate of the workpiece clamping plate 4, which is convenient for the clamping rotating rod 3 to be installed through threads. The inner part of the bearing plate of the fixed bearing plate 2 is threadedly installed with a limit adjustment rod in the front and rear directions 5. It is convenient for the limit adjustment rod 5 to move forward and backward through threaded engagement. The outer circumference of the limit adjustment rod 5 is provided with threads, which is convenient for installation through threads. The rear end face of the limit adjustment rod 5 is provided with a regular hexagonal prism, which is convenient for rotation through tools. The front end face of the limit adjustment rod 5 is provided with a fixed column, which is convenient for the workpiece limit plate 6 to be installed through a bearing. The fixed column of the limit adjustment rod 5 is provided with a workpiece limit plate 6 in the left and right directions through a bearing, which is convenient for driving the workpiece limit plate 6 to move forward and backward synchronously. The workpiece limit plate 6 is a T-shaped plate structure as a whole, which is convenient for inserting into the rectangular hole of the fixed bearing plate 2. A bearing circular groove is provided at the bottom of the rear end face of the workpiece limit plate 6, which is convenient for the limit adjustment rod 5 to be installed through a bearing.

[0029] Among them, a lifting bearing plate 7 in the upper and lower directions is installed in the middle of the rear end of the top end face of the fixed bearing plate 2 through bolts, which is convenient for carrying various components. A strip hole that runs through the upper and lower directions is opened in the middle of the lifting bearing plate 7, which is convenient for the lifting and moving plate 9 to insert the guide. A horizontal plate with upper and lower through holes in the middle is arranged on the top of the rear end face of the lifting bearing plate 7, which is convenient for the upper end of the lifting and adjusting rod 8 to be installed through the bearing. A fixed plate with upper and lower through holes in the middle is arranged on the bottom of the rear end face of the lifting bearing plate 7, which is convenient for the lower end of the lifting and adjusting rod 8 to be installed through the bearing. The left and right ends of the fixed plate of the lifting bearing plate 7 are provided with fixing holes that run through the upper and lower directions, which is convenient for being installed on the fixed bearing plate 2 through bolts. The upper and lower parts are installed between the horizontal plate and the fixed plate of the lifting bearing plate 7 through bearings. The lifting and adjusting rod 8 is arranged in the direction of the lifting and adjusting rod 8, which is convenient for the lifting and adjusting rod 8 to rotate. The outer circumference of the lifting and adjusting rod 8 is provided with a thread, which is convenient for the lifting and moving plate 9 to be installed by thread. The upper and lower end surfaces of the lifting and adjusting rod 8 are provided with fixed columns, which are convenient for installation through bearings. A regular hexagonal prism is provided on the upper end of the lifting and adjusting rod 8, which is convenient for rotation through tools. The outer circumference of the lifting and adjusting rod 8 is threadedly installed with a lifting and moving plate 9 in the front and rear directions, which is convenient for the lifting and moving plate 9 to be lifted and lowered through threaded engagement. An insertion plate with threaded holes running through the upper and lower ends is provided in the middle of the rear end surface of the lifting and moving plate 9, which is convenient for the lifting and adjusting rod 8 to be installed by thread. A lifting screw hole running through the upper and lower ends is provided in the middle of the front end of the lifting and moving plate 9, which is convenient for the lowering limit rod 10 to be installed by thread. A through hole is opened in the square that runs through the top and bottom, which is convenient for the extended shaft at the bottom of the grinding motor 11 to pass through. Six fixing screw holes that run through the top and bottom are opened in a circular array outside the through hole of the lifting and moving plate 9, which is convenient for the grinding motor 11 to be installed by bolts. A descending limit rod 10 in the up and down direction is installed inside the lifting and screw holes of the lifting and moving plate 9, which is convenient for the descending limit rod 10 to be lifted and lowered through threaded engagement. A thread is opened on the outer circumference of the descending limit rod 10, which is convenient for threaded installation. A regular hexagonal prism is set on the top end face of the descending limit rod 10, which is convenient for rotation by tools. A grinding motor 11 in the up and down direction is installed by bolts in the middle front of the top end face of the lifting and moving plate 9, which is convenient for driving the forming grinding disc 12 to rotate. The outer circumference of the bottom of the grinding motor 11 A fixing ring plate with upper and lower through holes is arranged around it for convenient fixing by bolts, a regular hexagonal groove is provided on the end face of the shaft extending from the bottom of the grinding motor 11, for convenient insertion of the regular hexagonal prism of the formed grinding disc 12 for synchronous rotation, a through hole in the front and rear directions is provided on the front wall of the regular hexagonal groove of the grinding motor 11 for convenient passage of the fixing bolts of the formed grinding disc 12, a formed grinding disc 12 is inserted into and fixed by bolts inside the regular hexagonal groove of the grinding motor 11 for convenient forming and grinding of the workpiece, a regular hexagonal prism in the upper and lower directions is provided in the center of the top end face of the formed grinding disc 12 for convenient insertion into the regular hexagonal groove of the grinding motor 11 for synchronous rotation, a threaded hole running through front and rear is provided in the middle of the regular hexagonal prism of the formed grinding disc 12 for convenient bolt installation.

[0030] The specific usage and function of this embodiment are as follows:

[0031] In the utility model, Figure 1 The workpiece to be polished is clamped between the workpiece clamping plates 4 as shown. Figure 2 The front end face of the workpiece stop plate 6 shown in the figure contacts the rear end face of the workpiece to be polished, thereby ensuring that the workpiece to be polished is always located directly below the formed polishing disc 12. When the workpiece clamping plate 4 moves outward to release the clamping, the clamping rotating rod 3 is rotated by the tool to engage with the workpiece clamping plate 4 threadedly, so that the workpiece clamping plate 4 moves outward synchronously through the threaded engagement to release the clamping of the workpiece to be polished. The reverse operation is a clamping operation. When the workpiece stop plate 6 is adjusted forward or backward, the limit adjustment rod 5 is rotated by the tool to engage with the fixed bearing plate 2 threadedly, so that the limit adjustment rod 5 is engaged forward through the threaded engagement. Or move backward, the workpiece limit plate 6 can be driven to move forward or backward synchronously by the limit adjustment rod 5. When the forming grinding disc 12 descends, the lifting adjustment rod 8 is rotated by the tool to engage with the lifting movable plate 9 threadedly, so that the lifting movable plate 9 descends through the threaded engagement, and the lifting movable plate 9 drives the descending limit rod 10 and the forming grinding disc 12 to descend synchronously. After the bottom end face of the descending limit rod 10 contacts the top end face of the fixed supporting plate 2, the forming grinding disc 12 cannot continue to descend to grind the workpiece to be polished, thereby preventing the forming grinding disc 12 from descending excessively.

[0032] Embodiment 2:

[0033] The difference from the first embodiment is that the regular hexagonal prism of the clamping rotating rod 3 can also be set as a regular heptagonal prism, so that the clamping rotating rod 3 can only be rotated by a special tool that cooperates with the regular heptagonal prism, preventing non-staff from rotating and adjusting the clamping rotating rod 3.

[0034] Embodiment three:

[0035] The difference from the first embodiment is that the regular hexagonal prism of the limit adjustment rod 5 can also be set as a regular heptagonal prism, so that the limit adjustment rod 5 can only be rotated by a special tool that cooperates with the regular heptagonal prism, preventing non-staff from rotating and adjusting the limit adjustment rod 5.

Claims

1. An efficient forming and polishing device, characterized in that: The device body (1) comprises a fixed bearing plate (2), wherein the fixed bearing plate (2) is provided with a strip hole extending vertically and horizontally in the middle front thereof, a rectangular hole extending vertically and horizontally in the middle rear thereof, a threaded hole extending vertically and horizontally in the middle rear thereof, a bearing plate with a threaded hole extending vertically and horizontally in the middle rear thereof, a bearing plate with a threaded hole extending vertically and horizontally in the middle rear thereof, a bearing plate with a threaded hole extending vertically and horizontally in the middle rear thereof, a bearing plate with a bearing hole extending vertically and horizontally in the middle rear thereof, a bearing plate with a bearing hole extending vertically and horizontally in the middle rear thereof, a bearing plate with a bearing hole extending vertically and horizontally in the middle rear thereof, a fixed plate with a fixed ... The left and right end faces of the clamping rotating rod (3) are both provided with fixing columns, and the outer end faces of the fixing columns of the clamping rotating rod (3) are provided with regular hexagonal prisms. The outer circumferences of the left and right sides of the clamping rotating rod (3) are both provided with workpiece clamping plates (4) through threads. The upper part of the workpiece clamping plate (4) is provided with clamping plates in the front and rear directions. The middle of the bottom end face of the clamping plate of the workpiece clamping plate (4) is provided with an insertion plate with left and right threaded holes. A limit adjustment rod (5) is installed inside the bearing plate of the fixed bearing plate (2) through threads. The outer circumference of the limit adjustment rod (5) is provided with threads. The rear end face of the limit adjustment rod (5) is provided with regular hexagonal prisms. The front end face of the limit adjustment rod (5) is provided with fixing columns. A workpiece limit plate (6) is installed on the fixing column of the limit adjustment rod (5) through a bearing. The workpiece limit plate (6) is a T-shaped plate structure as a whole. The bottom of the rear end face of the workpiece limit plate (6) is provided with a bearing circular groove.

2. A high-efficiency forming and polishing device as claimed in claim 1, characterized in that: A lifting bearing plate (7) is installed in the middle of the rear end of the top end surface of the fixed bearing plate (2) by bolts, and a strip hole is opened in the middle of the lifting bearing plate (7) running through the front and back in the vertical direction. A horizontal plate with a vertical through hole is arranged in the middle of the top of the rear end surface of the lifting bearing plate (7), and a fixed plate with a vertical through hole is arranged in the middle of the bottom of the rear end surface of the lifting bearing plate (7). The left and right ends of the fixed plate of the lifting bearing plate (7) are both provided with fixing holes running through the upper and lower directions.

3. A high-efficiency forming and polishing device as claimed in claim 2, characterized in that: A lifting adjustment rod (8) is installed between the horizontal plate and the fixed plate of the lifting bearing plate (7) via a bearing, a thread is provided on the outer circumference of the lifting adjustment rod (8), fixing columns are provided on the upper and lower end surfaces of the lifting adjustment rod (8), and a regular hexagonal prism is provided on the upper end of the lifting adjustment rod (8).

4. A high-efficiency forming and polishing device as claimed in claim 3, characterized in that: The outer circumference of the lifting adjustment rod (8) is threadedly mounted with a lifting plate (9); an insertion plate with a threaded hole passing through the lifting plate (9) is arranged in the middle of the rear end surface; a lifting screw hole passing through the lifting plate (9) is arranged in the middle of the front end; a through hole passing through the lifting plate (9) is arranged in the front of the lifting plate (9); and six fixing screw holes passing through the lifting plate (9) are arranged in an annular array around the through hole.

5. A high-efficiency forming and polishing device as claimed in claim 4, characterized in that: A descent limit rod (10) is installed inside the lifting screw hole of the lifting movable plate (9), a thread is provided on the outer circumference of the descent limit rod (10), and a regular hexagonal prism is provided on the top end surface of the descent limit rod (10).

6. A high-efficiency forming and polishing device as claimed in claim 5, characterized in that: A grinding motor (11) is installed at the front middle of the top end surface of the lifting and moving plate (9) by bolts, a fixed ring plate with upper and lower through holes is arranged on the outer circumference of the bottom of the grinding motor (11), a regular hexagonal groove is arranged on the end surface of the shaft extending from the bottom of the grinding motor (11), and a through hole in the front and rear directions is arranged on the front wall of the regular hexagonal groove of the grinding motor (11).

7. A high-efficiency forming and polishing device as claimed in claim 6, characterized in that: A shaped grinding disc (12) is inserted into the regular hexagonal groove of the grinding motor (11) and fixed by bolts, a regular hexagonal prism in the top end face of the shaped grinding disc (12) is arranged in the center of the top end face, and a threaded hole is opened in the middle of the regular hexagonal prism of the shaped grinding disc (12) to penetrate forward and backward.