CN210335402U - Polishing and chamfering integrated device for processing magnet material - Google Patents
Polishing and chamfering integrated device for processing magnet material Download PDFInfo
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- CN210335402U CN210335402U CN201822102276.7U CN201822102276U CN210335402U CN 210335402 U CN210335402 U CN 210335402U CN 201822102276 U CN201822102276 U CN 201822102276U CN 210335402 U CN210335402 U CN 210335402U
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Abstract
The utility model relates to an integrative device of polishing chamfer for processing magnet material, its characterized in that: the grinding and chamfering machine is characterized by comprising a feeding mechanism, a transmission line, a grinding mechanism and a chamfering mechanism, wherein the grinding mechanism and the chamfering mechanism are sequentially arranged at the rear part of the feeding mechanism, and the transmission line is respectively arranged between the feeding mechanism and the grinding mechanism, between the grinding mechanism and the chamfering mechanism and at the rear part of the chamfering mechanism. The utility model has the advantages of scientific and reasonable design, have the advantage of avoiding repeated material loading, saving artifical, improving machining efficiency, degree of automation is high, easily realize, be a polishing chamfer integrative device for processing magnet material who has higher novelty.
Description
Technical Field
The utility model belongs to magnet material processingequipment field relates to a polishing chamfer all-in-one, especially a polishing chamfer integrative device for processing magnet material.
Background
The magnet material is a material that reacts in some way to the magnetic field. Ferromagnetic substances and ferrimagnetic substances are ferromagnetic substances, and a so-called magnetic material means a ferromagnetic material. Ferromagnetic materials are typically Fe, Co, Ni elements and their alloys, rare earth elements and their alloys, and some Mn compounds.
After the magnet material is preliminarily formed, the surface and the corners of the magnet material need to be polished and chamfered so as to meet the requirements of the roughness of the surface of the magnet material and the chamfering degree of the corners.
Chinese patent literature discloses an auxiliary processing device for a neodymium iron boron magnet, which is disclosed as CN105773339B, and is a device specially used for chamfering a magnet material; another two chinese patent documents, one discloses a dust removal type ndfeb square abrasive disc machine with publication number CN207289793U, and the other discloses a double-side edge grinding device for ndfeb with publication number CN207724028U, both of which are used for polishing magnet materials. According to the above documents, the existing equipment for polishing and chamfering the magnet material is designed in a split mode, after one procedure is processed, the next procedure needs to be sent by workers, the feeding work in each procedure is completed manually, the automation degree is low, time and labor are wasted, and the processing efficiency is seriously affected.
Through a search for a patent publication, no patent publication that is the same as the present patent application is found.
Disclosure of Invention
An object of the utility model is to overcome prior art not enough, provide a simple structure, avoid repeated material loading, save artifical, improve machining efficiency, degree of automation is high, the integrative device of polishing chamfer for processing magnet material that easily realizes.
The utility model provides a its technical problem take following technical scheme to realize:
the utility model provides an integrative device of polishing chamfer for processing magnet material which characterized in that: the grinding and chamfering machine is characterized by comprising a feeding mechanism, a transmission line, a grinding mechanism and a chamfering mechanism, wherein the grinding mechanism and the chamfering mechanism are sequentially arranged at the rear part of the feeding mechanism, and the transmission line is respectively arranged between the feeding mechanism and the grinding mechanism, between the grinding mechanism and the chamfering mechanism and at the rear part of the chamfering mechanism.
The feeding mechanism comprises a box conveying line, a box discharging conveying line, a material carrying lifting unit, a feeding unit and a box conveying unit, wherein the box discharging conveying line and the box conveying line are arranged oppositely from top to bottom, the material carrying lifting unit is arranged at one end of a box discharging of the box discharging conveying line, the feeding unit vertical to the direction of the box discharging conveying line is arranged in front of the material carrying lifting unit, and the box conveying unit opposite to the box discharging conveying line is arranged outside the material carrying lifting unit.
The material loading lifting unit is composed of a box loading platform, a lead screw and a servo motor, wherein the box loading platform is arranged at one end of the box outlet conveying line, the box loading platform is connected to the lead screw in a threaded mode, and the lead screw is driven to rotate by the servo motor so as to drive the box loading platform to lift.
The box carrying platform is composed of a lifting platform and a cylinder jacking part, the lifting platform is composed of a top plate, a bottom plate, side plates, support rods and an internal thread sleeve, the top plate and the bottom plate are arranged oppositely up and down, the side plates are arranged at the outer side ends of the sides between the top plate and the bottom plate, the support rods are arranged at the inner side ends of the top plate and the bottom plate, the internal thread sleeve which is in threaded installation with a lead screw is arranged on the side plates, and an opening is formed in the top plate; the top plate is provided with a cylinder tightening part, the cylinder tightening part consists of a cylinder and a tightening head, and the tightening head stretches out and draws back at the opening of the top plate through a cylinder rod of the cylinder.
And the feeding unit consists of a feeding cylinder and a feeding push arm, and the feeding push arm is driven by a cylinder rod of the feeding cylinder.
The box feeding unit is composed of a box feeding cylinder and a box feeding push arm, and the box feeding push arm is driven by a cylinder rod of the box feeding cylinder.
The grinding mechanism comprises a coarse grinding mechanism and a fine grinding mechanism, a conveying line is arranged between the coarse grinding mechanism and the fine grinding mechanism, the coarse grinding mechanism and the fine grinding mechanism respectively comprise two grinding units which are oppositely arranged up and down, each grinding unit comprises a mounting frame, a first roller, a second roller, a third roller, an abrasive belt, a tensioning cylinder, a motor and a belt, adjusting openings are formed in two side walls of the mounting frame, the first roller driven by the tensioning cylinder penetrates through the adjusting openings, the second roller and the third roller are respectively arranged at the front end and the rear end of one side of an opening of the mounting frame, the second roller is driven by the motor belt arranged on the mounting frame, and the abrasive belt is wound on the first roller, the second roller and the third roller.
The chamfering mechanism is composed of a first chamfering mechanism and a second chamfering mechanism, the first chamfering mechanism and the second chamfering mechanism are arranged in two directions perpendicular to each other, the first chamfering mechanism and the second chamfering mechanism are composed of chamfering units symmetrically arranged on two sides of the transmission line, each chamfering unit is composed of an upper fixing plate, a lower fixing plate, a fixing shaft, a reversing motor, a driving motor, a mounting plate and a grinding wheel, the lower fixing plate is connected to the lower end face of the upper fixing plate through the fixing shaft, the fixing shaft is driven by the reversing motor arranged on the upper fixing plate, the mounting plate is fixedly arranged on the fixing shaft, the grinding wheels are uniformly distributed on the mounting plate at intervals through transmission shafts, the rotation of the grinding wheels is realized by driving the transmission shafts through driving motor belts, and the driving motor is arranged on the lower fixing plate.
And the mounting plate is a triangular mounting plate, grinding wheels are mounted at each corner of the triangular mounting plate, and a line formed between every two grinding wheels is parallel to the edge of the triangular mounting plate.
And the slide box is composed of a quadrilateral frame, the length, the width and the height of the quadrilateral frame are matched with the lifting platform of the slide box platform, and the top of the quadrilateral frame is provided with a top interface opposite to the opening on the lifting platform.
The utility model has the advantages that:
1. this an integrative device of polishing chamfer for processing magnet material has realized polishing, chamfer processing work through a material loading, has avoided repeated material loading, has improved degree of automation, has saved the cost of labor, has improved the machining efficiency of magnetism material greatly.
2. This an integrative device of polishing chamfer for processing magnet material has realized the automatic purpose of material loading through the setting of feed mechanism, has saved the manpower, has improved material loading efficiency.
3. This an integrative device of polishing chamfer for processing magnet material through the setting of the tight portion in cylinder top on the elevating platform, has avoided the elevating platform at the in-process that goes up and down, and the magnetism material is placed unstable problem in slide glass box, guarantees going on in order of material loading work.
4. This an integrative device of polishing chamfer for processing magnet material, through the vertical form design that just adopts the emery wheel dish to carry out the polishing to magnetic material that will have now for this patent adopts the horizontal polishing form in abrasive band, has avoided because of the rigid injury to magnetic material that leads to the fact of polishing, and simultaneously, the horizontal form of polishing is also more stable than vertical form of polishing, has effectively reduced the rejection rate.
5. This an integrative device of polishing chamfer for processing magnet material through the chamfer mechanism that designs the chamfer mechanism for can commutate, has made things convenient for the switching of different specification and dimension emery wheels, improves machining efficiency.
6. The utility model has the advantages of scientific and reasonable design, have the advantage of avoiding repeated material loading, saving artifical, improving machining efficiency, degree of automation is high, easily realize, be a polishing chamfer integrative device for processing magnet material who has higher novelty.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a left side view of FIG. 1;
fig. 4 is a schematic structural view of the polishing unit of the present invention;
FIG. 5 is a perspective view of FIG. 4;
FIG. 6 is a schematic structural view of the chamfering unit of the present invention;
fig. 7 is a perspective view of fig. 6.
Description of the reference numerals
1-feeding unit, 2-feeding mechanism, 3-rough grinding mechanism, 4-fine grinding mechanism, 5-first chamfering mechanism, 6-second chamfering mechanism, 7-box-out conveying line, 8-box loading box, 9-first conveying line, 10-servo motor, 11-box-conveying pushing arm, 12-box-conveying air cylinder, 13-second conveying line, 14-third conveying line, 15-fourth conveying line, 16-fifth conveying line, 17-seventh conveying line, 18-box-conveying line, 19-magnetic material, 20-lifting table, 21-internal thread sleeve, 22-tightening head, 23-air cylinder tightening part, 24-lead screw, 25-motor, 26-adjusting port, 27-mounting rack, 28-first roller, 29-a tensioning cylinder, 30-a third roller, 31-a sanding belt, 32-a second roller, 33-a reversing motor, 34-an upper fixing plate, 35-a fixed shaft, 36-a transmission shaft, 37-a grinding wheel, 38-a mounting plate, 39-a lower fixing plate and 40-a driving motor.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings:
a polishing and chamfering integrated device for processing magnet materials is innovative in that: the grinding mechanism consists of a rough grinding mechanism 3 and a fine grinding mechanism 4, the chamfering mechanism consists of a first chamfering mechanism 5 and a second chamfering mechanism 6, a first conveying line 9 is arranged behind a discharge port of the feeding mechanism, the rough grinding mechanism is arranged behind the first conveying line, a second conveying line 13 is arranged behind the rough grinding mechanism, the fine grinding mechanism is arranged behind the second conveying line, a third conveying line 14 is arranged behind the fine grinding mechanism, the first chamfering mechanism is arranged behind the third conveying line, a fourth conveying line 15 is arranged behind the first chamfering mechanism, a fifth conveying line 16 is arranged behind the fourth conveying line, a sixth conveying line 41 which is perpendicular to the fifth conveying line is arranged on one side of the tail end of the fifth conveying line, and a feeding unit is arranged on the other side of the fifth conveying line opposite to the sixth conveying line, a second chamfering mechanism is arranged behind the sixth conveying line, and a seventh conveying line 17 leading to the collecting area is arranged behind the second chamfering mechanism.
The feeding mechanism comprises a box conveying line 18, a box discharging conveying line 7, a material loading lifting unit, a feeding unit and a box conveying unit, the box discharging conveying line and the box conveying line are arranged oppositely from top to bottom, the material loading lifting unit is arranged at one end of a box discharging of the box conveying line, the feeding unit vertical to the direction of the box discharging conveying line is arranged in front of the material loading lifting unit, and the box conveying unit opposite to the box discharging conveying line is arranged outside the material loading lifting unit.
The material loading lifting unit consists of a box loading platform, a lead screw 24 and a servo motor 10, wherein the box loading platform is arranged at one end of the box outlet conveying line, the box loading platform is in threaded connection with the lead screw, and the lead screw is driven to rotate by the servo motor so as to drive the box loading platform to lift.
The box carrying platform consists of a lifting platform 20 and a cylinder jacking part 23, the lifting platform consists of a top plate, a bottom plate, side plates, support rods and an internal thread sleeve 21, the top plate and the bottom plate are arranged oppositely up and down, the side plates are arranged at the outer side ends of the sides between the top plate and the bottom plate, the support rods are arranged at the inner side ends of the top plate and the bottom plate, the internal thread sleeve which is in threaded installation with a lead screw is arranged on the side plates, and an opening is arranged on the top plate; the top plate is provided with a cylinder tightening part which consists of a cylinder and a tightening head 22, and the tightening head extends and retracts at the opening of the top plate through a cylinder rod of the cylinder.
The feeding unit 1 is composed of a feeding cylinder and a feeding push arm, and the feeding push arm is driven by a cylinder rod of the feeding cylinder.
The box feeding unit is composed of a box feeding cylinder 12 and a box feeding push arm 11, and the box feeding push arm is driven by a cylinder rod of the box feeding cylinder.
The rough grinding mechanism and the fine grinding mechanism are composed of two grinding units which are arranged oppositely up and down, each grinding unit is composed of an installation frame 27, a first roller 28, a second roller 32, a third roller 30, an abrasive belt 31, a tensioning cylinder 29, a motor 25 and a belt, adjusting openings 26 are formed in two side walls of the installation frame, the first rollers driven by the tensioning cylinder penetrate through the adjusting openings, the second rollers and the third rollers are arranged at the front end and the rear end of one side of an opening of the installation frame respectively, two ends of each second roller are driven by a motor belt with double output shafts, and the abrasive belts are wound on the first rollers, the second rollers and the third rollers. The tension force of the abrasive belt is adjusted through the tension cylinder, so that the abrasive belt is ensured to have certain tension force. The magnetic material passes through the gap between the abrasive belts of the upper and lower grinding units, and the transmission speed of the second transmission line is set to be lower than the rotation speed of the abrasive belts in the program, so that the magnetic material and the abrasive belts slide relatively to each other, and the upper and lower surfaces of the magnetic material are polished. The structure of the fine grinding mechanism is identical to that of the coarse grinding mechanism, and the difference between the fine grinding mechanism and the coarse grinding mechanism is that the thickness of the abrasive belt is different.
The first chamfering mechanism and the second chamfering mechanism are arranged in two directions which are perpendicular to each other, the first chamfering mechanism and the second chamfering mechanism are composed of chamfering units which are symmetrically arranged on two sides of a conveying line, each chamfering unit is composed of an upper fixing plate 34, a lower fixing plate 39, a fixing shaft 35, a reversing motor 33, a driving motor 40, a mounting plate 38 and a grinding wheel 37, the lower fixing plate is connected to the lower end face of the upper fixing plate through the fixing shaft, the fixing shaft is driven by the reversing motor which is arranged on the upper fixing plate, the mounting plates are fixedly arranged on the fixing shaft, V-shaped groove grinding wheels are uniformly distributed on the mounting plate at intervals through transmission shafts 36, the rotation of each grinding wheel is realized by driving each transmission shaft through a belt of the driving motors, and the driving motors are arranged on the lower fixing plate.
The mounting plate is a triangular mounting plate, grinding wheels are mounted at each corner of the triangular mounting plate, and a line formed between every two grinding wheels is parallel to the edge of the triangular mounting plate.
The magnetic material is conveyed to the first chamfering mechanism through the third conveying line after being finely ground, the magnetic material is conveyed in a V-shaped groove due to the fact that the grinding wheel is a V-shaped groove grinding wheel, meanwhile, the magnetic material and the grinding wheel move relatively due to the fact that the conveying speed of the fourth conveying line is different from the rotating speed of the grinding wheel, and chamfering processing of the magnetic material is achieved.
The slide box 8 is composed of a quadrilateral frame, the length, the width and the height of the quadrilateral frame are matched with the lifting platform of the slide box platform, and the top of the quadrilateral frame is provided with a top interface opposite to the opening on the lifting platform.
This all-in-one equipment earlier stage needs prepare work, and magnetism material 19 needs the manual work to place corresponding magnetism material slide cassette according to the magnetism material size of difference after the film melting process promptly to pile up the mode. And the magnetic material slide boxes are conveyed to a material waiting area of the all-in-one machine equipment through a transportation workshop. The magnetic material slide cassette is stably placed on a cassette conveying line by an operator of the all-in-one machine equipment, the cassette conveying line conveys the magnetic material slide cassette to a cassette carrying table under the action of a motor, a cylinder clamping part is arranged on the cassette carrying table, the magnetic material slide cassette is fixed on the cassette carrying table through the cylinder clamping part, and the cassette carrying table moves upwards under the action of a servo motor and a lead screw. The cassette loading platform stops moving when the uppermost magnetic material in the loaded cassette is aligned with the first transmission line. Horizontally pushing the first magnetic material to the first conveying line through the feeding air cylinder, raising the box carrying platform by the height of one magnetic material under the action of the servo motor, horizontally pushing the uppermost magnetic material to the first conveying line through the feeding air cylinder again, and circulating the steps until all the magnetic materials in the box carrying platform are completely conveyed to the first conveying line; the empty material magnetic material slide boxes are pushed to a box outlet conveying line by a box feeding cylinder, the box loading platform moves downwards to continue loading the full material magnetic material slide boxes, and the process is repeated. The plate type magnetic material on the first conveying line is polished on the upper surface and the lower surface of the magnetic material through the coarse grinding mechanism and the fine grinding mechanism respectively through the conveying line, chamfering processing on 4 forward sides of the magnetic material is achieved through the first chamfering mechanism, 90-degree reversing conveying of the magnetic material is achieved through the feeding air cylinder when the fifth conveying line is operated to the terminal, and chamfering work on 4 forward sides of the other magnetic material is achieved through the second chamfering mechanism under the effect of the sixth conveying line. After polishing and chamfering are finished, the processed magnetic materials are conveyed to the collecting area under the action of the seventh conveying line, and thus, the polishing and chamfering operation of the whole magnetic material is finished.
Although the embodiments of the present invention and the accompanying drawings are disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims, and therefore, the scope of the present invention is not limited to the disclosure of the embodiments and the accompanying drawings.
Claims (9)
1. The utility model provides an integrative device of polishing chamfer for processing magnet material which characterized in that: the grinding and chamfering machine is characterized by comprising a feeding mechanism, a transmission line, a grinding mechanism and a chamfering mechanism, wherein the grinding mechanism and the chamfering mechanism are sequentially arranged at the rear part of the feeding mechanism, and the transmission line is respectively arranged between the feeding mechanism and the grinding mechanism, between the grinding mechanism and the chamfering mechanism and at the rear part of the chamfering mechanism.
2. The polishing and chamfering integrated apparatus for processing a magnet material as claimed in claim 1, wherein: the feeding mechanism comprises a box conveying line, a box discharging conveying line, a material loading lifting unit, a feeding unit and a box conveying unit, the box discharging conveying line and the box conveying line are arranged relatively from top to bottom, the material loading lifting unit is arranged at one end of a box discharging of the box conveying line, the feeding unit vertical to the direction of the box discharging conveying line is arranged in front of the material loading lifting unit, and the box conveying unit arranged relatively to the box discharging conveying line is arranged outside the material loading lifting unit.
3. The polishing and chamfering integrated apparatus for processing a magnet material as claimed in claim 2, wherein: the material loading lifting unit is composed of a box loading platform, a lead screw and a servo motor, wherein the box loading platform is arranged at one end of a box outlet of the box outlet transmission line, the box loading platform is in threaded connection with the lead screw, and the lead screw is driven to rotate by the servo motor so as to drive the box loading platform to lift.
4. A polishing and chamfering integrated apparatus for processing a magnet material as claimed in claim 3, wherein: the box carrying platform consists of a lifting platform and a cylinder jacking part, the lifting platform consists of a top plate, a bottom plate, side plates, support rods and an internal thread sleeve, the top plate and the bottom plate are arranged oppositely up and down, the side plates are arranged at the outer side ends of the sides between the top plate and the bottom plate, the support rods are arranged at the inner side ends of the top plate and the bottom plate, the internal thread sleeve which is in threaded installation with a lead screw is arranged on the side plates, and an opening is arranged on the top plate; the top plate is provided with a cylinder tightening part, the cylinder tightening part consists of a cylinder and a tightening head, and the tightening head stretches out and draws back at the opening of the top plate through a cylinder rod of the cylinder.
5. The polishing and chamfering integrated apparatus for processing a magnet material as claimed in claim 2, wherein: the feeding unit consists of a feeding cylinder and a feeding push arm, and the feeding push arm is driven by a cylinder rod of the feeding cylinder.
6. The polishing and chamfering integrated apparatus for processing a magnet material as claimed in claim 2, wherein: the box feeding unit is composed of a box feeding cylinder and a box feeding push arm, and the box feeding push arm is driven by a cylinder rod of the box feeding cylinder.
7. The polishing and chamfering integrated apparatus for processing a magnet material as claimed in claim 1, wherein: the grinding mechanism comprises a coarse grinding mechanism and a fine grinding mechanism, a conveying line is arranged between the coarse grinding mechanism and the fine grinding mechanism, the coarse grinding mechanism and the fine grinding mechanism are respectively composed of two grinding units which are oppositely arranged up and down, each grinding unit comprises an installation frame, a first roller, a second roller, a third roller, an abrasive belt, a tensioning cylinder, a motor and a belt, adjusting openings are formed in two side walls of the installation frame, the first roller driven by the tensioning cylinder penetrates through the adjusting openings, the second roller and the third roller are respectively arranged at the front end and the rear end of one side of an opening of the installation frame, the second roller is driven by the motor belt arranged on the installation frame, and the abrasive belt is wound on the first roller, the second roller and the third roller.
8. The polishing and chamfering integrated apparatus for processing a magnet material as claimed in claim 1, wherein: the chamfering mechanism is composed of a first chamfering mechanism and a second chamfering mechanism, the first chamfering mechanism and the second chamfering mechanism are arranged in two directions which are perpendicular to each other, the first chamfering mechanism and the second chamfering mechanism are composed of chamfering units symmetrically arranged on two sides of the transmission line, each chamfering unit is composed of an upper fixing plate, a lower fixing plate, a fixing shaft, a reversing motor, a driving motor, a mounting plate and a grinding wheel, the lower fixing plate is connected to the lower end face of the upper fixing plate through the fixing shaft, the fixing shaft is driven by the reversing motor arranged on the upper fixing plate, the mounting plate is fixedly arranged on the fixing shaft, the grinding wheels are uniformly distributed on the mounting plate at intervals through the transmission shafts, the rotation of each grinding wheel is realized by driving each transmission shaft through a driving motor belt, and the driving motor is arranged on the lower fixing plate.
9. The polishing and chamfering integrated apparatus for processing a magnet material as claimed in claim 8, wherein: the mounting plate is a triangular mounting plate, grinding wheels are mounted at each corner of the triangular mounting plate, and a line formed between every two grinding wheels is parallel to the edge of the triangular mounting plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822102276.7U CN210335402U (en) | 2018-12-14 | 2018-12-14 | Polishing and chamfering integrated device for processing magnet material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822102276.7U CN210335402U (en) | 2018-12-14 | 2018-12-14 | Polishing and chamfering integrated device for processing magnet material |
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| CN210335402U true CN210335402U (en) | 2020-04-17 |
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| CN201822102276.7U Active CN210335402U (en) | 2018-12-14 | 2018-12-14 | Polishing and chamfering integrated device for processing magnet material |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109623548A (en) * | 2018-12-14 | 2019-04-16 | 苏珀新材料技术衡水有限公司 | It is a kind of for processing the polishing chamfering all-in-one machine of magnet material |
| CN112123049A (en) * | 2020-10-19 | 2020-12-25 | 台州椒江门发机械科技有限公司 | Metal inner hole grinding device capable of reducing crack rate |
-
2018
- 2018-12-14 CN CN201822102276.7U patent/CN210335402U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109623548A (en) * | 2018-12-14 | 2019-04-16 | 苏珀新材料技术衡水有限公司 | It is a kind of for processing the polishing chamfering all-in-one machine of magnet material |
| CN109623548B (en) * | 2018-12-14 | 2024-04-12 | 苏珀新材料技术衡水有限公司 | Polishing and chamfering integrated machine for processing magnet materials |
| CN112123049A (en) * | 2020-10-19 | 2020-12-25 | 台州椒江门发机械科技有限公司 | Metal inner hole grinding device capable of reducing crack rate |
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