CN111633577A - Brush polishing disc and manufacturing method thereof - Google Patents
Brush polishing disc and manufacturing method thereof Download PDFInfo
- Publication number
- CN111633577A CN111633577A CN202010425673.7A CN202010425673A CN111633577A CN 111633577 A CN111633577 A CN 111633577A CN 202010425673 A CN202010425673 A CN 202010425673A CN 111633577 A CN111633577 A CN 111633577A
- Authority
- CN
- China
- Prior art keywords
- polishing
- base plate
- disc
- fixing
- beads
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
- B24D7/06—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor with inserted abrasive blocks, e.g. segmental
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
- B24D18/0018—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for by electrolytic deposition
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
- B24D18/0054—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for by impressing abrasive powder in a matrix
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
- B24D18/0072—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for using adhesives for bonding abrasive particles or grinding elements to a support, e.g. by gluing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
- B24D7/06—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor with inserted abrasive blocks, e.g. segmental
- B24D7/066—Grinding blocks; their mountings or supports
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
- B24D7/16—Bushings; Mountings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
- B24D7/18—Wheels of special form
Abstract
The invention relates to the technical field of brush head production, and discloses a brush hair polished disc and a manufacturing method thereof. Wherein the polishing disk comprises a base disk; the polishing device comprises a base plate, a polishing device and a polishing device, wherein a single or a plurality of polishing areas are arranged on the base plate, the polishing areas are arranged around the central shaft of the base plate and are positioned on the upper surface of the base plate, a plurality of fixing grooves are arranged in the polishing areas, and the fixing grooves are sequentially arranged at intervals along the direction from the center of the upper surface of the base plate to the outside; a plurality of polishing beads are fixedly arranged in the fixing groove, and an adhesive used for fixing the polishing beads in the fixing groove is arranged in the fixing groove; and a waste material groove is arranged between two adjacent polishing areas and is used for collecting waste materials generated by polishing. The application provides a CD is thrown to brush hair, at the in-process to the surface polishing of brush hair, can get rid of the burr on brush hair surface, improves its rounding off rate to the product quality of brush hair has been improved greatly.
Description
Technical Field
The invention relates to the technical field of brush head production, in particular to a brush hair polished disc and a manufacturing method thereof.
Background
The brush heads of manual and electric toothbrushes include bristles for cleaning the oral cavity. In some toothbrushes, the bristles are organized into tufts that are fixed within the head. In the process of manufacturing the brush head, the surface of the brush hair needs to be polished to improve the rounding rate of the brush hair, the higher the rounding rate of the brush hair is, the better the cleaning effect of the brush head on the oral cavity is, and meanwhile, the brush head is not easy to cause harm to the oral cavity and is favorable for protecting the gum. The smoothness of the surface of bristles is difficult to guarantee by the existing bristle grinding tool, and burrs easily occur, so that special polishing equipment is needed to polish the ground bristles, the burrs are removed, and the rounding rate of the bristles is improved.
Disclosure of Invention
The invention aims to provide a bristle polished disk and a manufacturing method thereof, and aims to solve the problem that the surface of bristles is not smooth enough after polishing in the toothbrush production process in the prior art.
The invention is realized in such a way that a brush-and-polish optical disc comprises a base disc; the polishing device comprises a base plate, a polishing device and a polishing device, wherein the base plate is provided with one or more polishing areas, the polishing areas are arranged around the central axis of the base plate and are positioned on the upper surface of the base plate, a plurality of fixing grooves are arranged in the polishing areas, and the fixing grooves are sequentially arranged at intervals along the direction from the center of the upper surface of the base plate to the outside; a plurality of polishing beads are fixedly arranged in the fixing groove, and an adhesive used for fixing the polishing beads in the fixing groove is arranged in the fixing groove; and a waste material groove is arranged between two adjacent polishing areas and is used for collecting waste materials generated by polishing.
Further, the polishing zones are arranged in a fan or other geometric shape.
Furthermore, a plurality of waste material holes for discharging waste materials are formed in the waste material groove.
Further, the fixed slots are arc-shaped, the circle center of the arc is located on the central shaft of the base plate, and the plurality of fixed slots are sequentially and uniformly arranged at intervals along the direction from the center of the upper surface of the base plate to the outside.
Further, the base plate is conical or disc-shaped.
Further, the bottom of the base plate is provided with a fixed seat, and the fixed seat is used for fixing the polishing disc to a position to be installed.
Further, the diameter of the polishing bead is not less than the width of the opening section of the fixing groove.
Further, the distance between two adjacent polishing beads in the same fixing groove is equal.
Compared with the prior art, the invention mainly has the following beneficial effects:
above-mentioned a brush hair polishing dish that provides, at the in-process of polishing the brush hair surface, need be fixed to appointed position with the polishing dish, can fix the top of this polishing dish with the one end of brush hair after that, treat polishing position and polishing district butt with the brush hair surface simultaneously, can adopt power component drive this polishing dish at last rotatory, make polishing pearl in the polishing district constantly bump with treating polishing position on brush hair surface, thereby realized the polishing treatment to brush hair surface, be favorable to getting rid of the burr on brush hair surface, improve its rounding rate, thereby the product quality of brush hair has been improved greatly.
The invention is realized in such a way that a method for manufacturing a brushed and polished optical disc comprises the following steps:
manufacturing the base plate by adopting a numerical control machining method;
molding a plurality of the polishing beads;
and respectively embedding a plurality of polishing beads into the fixing grooves on the base plate, and bonding and fixing the polishing beads in the fixing grooves by using an adhesive.
Further, after a plurality of polishing beads are molded, a layer of carborundum is coated on the surfaces of the polishing beads in a surface spraying or electroplating mode.
According to the manufacturing method of the brushed polishing disc, the polishing beads are bonded and fixed in the fixing groove by the adhesive, so that the polishing beads are combined with the base disc more tightly, the polishing beads are not easy to fall off in the rotating process of the polishing disc, and meanwhile, the manufacturing method is simple and low in production cost.
Drawings
FIG. 1 is a schematic structural diagram of a brushed and polished optical disc according to an embodiment of the present invention;
FIG. 2 is an exploded view of a bristle-polished disk according to an embodiment of the present invention;
FIG. 3 is a front view of a brushed optical disc according to an embodiment of the present invention;
FIG. 4 is a flow chart illustrating a method for manufacturing a brushed optical disc according to an embodiment of the present invention;
FIG. 5 is a flow chart illustrating a method for manufacturing a brushed optical disc according to another embodiment of the present invention.
Reference numerals: 1-base plate, 2-polishing bead, 3-fixing seat, 11-fixing groove, 12-waste groove and 121-waste hole.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
The following describes the implementation of the present invention in detail with reference to specific embodiments.
Fig. 1 is a schematic structural view of a brushed optical disc according to an embodiment of the present invention, and fig. 2 is an exploded schematic structural view of a brushed optical disc according to an embodiment of the present invention, which will be described in detail with reference to fig. 1 and 2.
A brush-polished compact disc comprises a base disc 1; the polishing device comprises a base plate 1, a polishing device and a polishing device, wherein a single or a plurality of polishing areas are arranged on the base plate 1, the polishing areas are arranged around the central axis of the base plate 1 and are positioned on the upper surface of the base plate 1, a plurality of fixing grooves 11 are arranged in the polishing areas, and the plurality of fixing grooves 11 are sequentially arranged at intervals along the direction from the center of the upper surface of the base plate 1 to the outside; a plurality of polishing beads 2 are fixedly arranged in the fixing groove 11, and an adhesive for fixing the polishing beads 2 in the fixing groove 11 is arranged in the fixing groove 11; a waste trough 12 is arranged between two adjacent polishing areas, and the waste trough 12 is used for collecting waste generated by polishing.
Above-mentioned a brush hair polishing dish that provides, at the in-process of polishing the brush hair surface, need be fixed to appointed position with the polishing dish, can be fixed the top of polishing dish with the one end of brush hair after that, treat polishing position and polishing district butt with the brush hair surface simultaneously, can adopt power component drive this polishing dish at last rotatory, make polishing pearl 2 in the polishing district constantly bump with treating polishing position on brush hair surface, thereby realized the polishing treatment to brush hair surface, be favorable to getting rid of the burr on brush hair surface, improve its rounding rate, thereby the product quality of brush hair has been improved greatly.
As an embodiment of the invention, the polishing zones are arranged in a fan or other geometric shape; when putting the brush hair in the upper surface of base plate 1 and rotate the polishing, be fan-shaped polishing district and can carry out abundant polishing to the brush hair surface to get rid of the burr on brush hair surface, make the surface of brush hair more smooth. Of course, the polishing zones may be arranged in various shapes on the upper surface of the base plate 1, and the invention is not limited thereto.
In one embodiment of the present invention, the waste chute 12 is provided with a plurality of waste holes 121 through which waste is discharged. To facilitate the discharge of the waste generated during the bristle polishing process, a plurality of waste holes 121 may be formed in the bottom of the waste tank 12. Preferably, the waste hole 121 may communicate with a dust suction pipe of an external dust collector, so as to suck the waste in the waste tank 12, and the waste in the waste tank 12 can enter the waste hole 121 along the waste tank 12 and be discharged from the dust suction pipe.
As an embodiment of the present invention, the fixing grooves 11 have a circular arc shape, the center of the circular arc is located on the central axis of the base plate 1, and the plurality of fixing grooves 11 are arranged at regular intervals in order in the direction from the center of the upper surface of the base plate 1 toward the outside. The polishing beads 2 are positioned in the fixing grooves 11 which are uniformly arranged at intervals, so that the polishing beads 2 are more uniformly distributed on the surface of the base plate 1, and the polishing performance of the polishing disc is improved.
As an embodiment of the invention, the base plate 1 is conical or disc-shaped. Referring to fig. 3, the base plate 1 of the polishing disc is conical, when the polishing disc is used for polishing the surface of the bristles, one ends of the bristles can be fixed above the polishing disc, meanwhile, the positions to be polished on the surfaces of the bristles are abutted to the polishing area, and the other ends of the bristles are obliquely arranged at a certain angle with the upper surface of the polishing disc, so that the contact area between the surface of the base plate 1 and the surfaces of the bristles in the polishing process can be increased, and the polishing efficiency of the bristles is improved.
As an embodiment of the present invention, the bottom of the base plate 1 is provided with a fixing seat 3, and the fixing seat 3 is used for fixing a polishing disc to a place to be installed. Optionally, the fixed seat 3 is provided with a threaded hole for being in threaded connection with a place to be installed, where the place to be installed may be on a frame of the bristle grinder, a frame of other equipment, or other positions capable of being fixedly matched with the fixed seat 3, which is not limited by the present invention.
As an embodiment of the present invention, the polishing bead 2 may be made of a metal material; during polishing, the spherical metal is contacted with the bristles, so that the bristles can be polished more smoothly, and the rounding rate of the bristles is improved. Alternatively, the spherical metal may be a metal material such as iron or copper. Of course, the polishing beads 2 may also be made of non-metal material, and a layer of diamond grains is coated on the surface of the polishing beads by surface spraying or electroplating. Preferably, the polishing beads 2 are spherical.
As an embodiment of the present invention, the diameter of the polishing bead 2 is not smaller than the opening sectional width of the fixing groove 11. Thus, only one row of polishing beads 2 can be fixed in each fixing groove 11, so that the polishing beads 2 can be more tightly fixed in the fixing grooves 11, and the polishing beads 2 are prevented from falling off.
Preferably, the distance between two adjacent polishing beads 2 located in the same fixing groove 11 is equal. This enables the polishing beads 2 to be more uniformly fixed in the fixing grooves 11, thereby improving the efficiency of bristle polishing and the polishing effect.
Preferably, a plurality of polishing beads 2 are also fixedly arranged in the waste tank 12, so that the density of the polishing beads 2 on the surface of the base plate 1 can be further improved, and the bristle polishing efficiency can be improved.
The embodiment of the present invention further provides a method for manufacturing a brushed optical disc, which is used for manufacturing any one of the above-mentioned brushed optical discs, fig. 4 shows a flow chart of the method for manufacturing a brushed optical disc according to the embodiment of the present invention, and the embodiment of the present invention will be described in detail with reference to fig. 4.
A method of manufacturing a brushed optical disc, the method comprising: step S100, step S200, and step S300.
Step S100: the base plate 1 is manufactured by a numerical control machining method.
Specifically, a desired base plate 1 (e.g., a conical or disk-shaped base plate 1) is machined on a numerical control machine tool according to the shape of the desired base plate 1.
Step S200: a plurality of polishing beads 2 are molded.
Specifically, a plurality of spherical beads may be molded by extrusion molding using a mold, and then the surface of the beads may be polished by a grinding wheel of a polishing machine to form the polishing beads 2. Alternatively, the spherical beads may be made of a metal material such as iron or copper.
Step S300: a plurality of polishing beads 2 are respectively inserted into the fixing grooves 11 on the base plate 1 and are adhesively fixed in the fixing grooves 11 using an adhesive.
Specifically, the polishing beads 2 may be embedded into the fixing grooves 11, and then the adhesive may be poured into the positions where the polishing beads 2 abut against the fixing grooves 11, so that the polishing beads and the fixing grooves are fixed; it is also possible to pour the adhesive into the fixing groove 11 and then embed the polishing bead 2 therein so that the two can be tightly combined. Alternatively, the adhesive may be a superglue containing ethyl alpha-cyanoacrylate.
Of course, the polishing beads 2 may be adhered and fixed in the fixing grooves 11 by chemical adhesion or physical mosaic.
Compared with the prior art, the method for manufacturing the brushing polishing disc has the advantages that the polishing beads 2 are bonded and fixed in the fixing grooves 11 by the adhesive, so that the polishing beads 2 are combined with the base disc 1 more tightly, the polishing beads are not easy to fall off in the rotation process of the polishing disc, and meanwhile, the manufacturing method is simple and low in production cost.
Referring to fig. 5, fig. 5 is a schematic flow chart illustrating a method for manufacturing a brushed polished optical disc according to another embodiment of the present invention. Based on the above embodiment, the method for manufacturing a brushed optical disc according to another embodiment of the present invention further includes the following steps after step S200:
step S201: after a plurality of polishing beads 2 are molded, a layer of carborundum is coated on the surfaces of the polishing beads 2 by adopting a surface spraying or electroplating mode.
Specifically, the diamond grains have high hardness and are wrapped on the surface of the spherical bead body, so that the diamond grains have higher hardness, and the polishing bead 2 has a better polishing effect. Of course, the diamond grains can be coated on the surface of the polishing beads 2 in various other ways, which is not limited by the invention.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A brush-polishing compact disc is characterized by comprising a base disc; the polishing device comprises a base plate, a polishing device and a polishing device, wherein the base plate is provided with one or more polishing areas, the polishing areas are arranged around the central axis of the base plate and are positioned on the upper surface of the base plate, a plurality of fixing grooves are arranged in the polishing areas, and the fixing grooves are sequentially arranged at intervals along the direction from the center of the upper surface of the base plate to the outside; a plurality of polishing beads are fixedly arranged in the fixing groove, and an adhesive used for fixing the polishing beads in the fixing groove is arranged in the fixing groove; and a waste material groove is arranged between two adjacent polishing areas and is used for collecting waste materials generated by polishing.
2. The bristle-polished disc of claim 1, wherein the polishing zones are arranged in a fan or other geometric shape.
3. The bristle-polished disc of claim 1, wherein the scrap receptacle is provided with a plurality of scrap holes for discharging scrap.
4. The bristle-polished disc of claim 1, wherein the fixing grooves have a circular arc shape having a center on a central axis of the base plate, and a plurality of the fixing grooves are sequentially and uniformly spaced in an outward direction from a center of an upper surface of the base plate.
5. The bristle-polished disc of claim 1, wherein the base disc is conical or disc-shaped.
6. The bristle-polished disc of claim 1, wherein the base plate is provided at its bottom with a fixing seat for fixing the polishing disc to a place to be installed.
7. The bristle-polished disc of any one of claims 1 to 6, wherein the diameter of the polishing bead is not less than the width of the opening section of the fixing groove.
8. The bristle-polished disc of claim 7, wherein the distance between two adjacent polishing beads in the same fixing groove is equal.
9. A method of manufacturing a bristle-polished disc as claimed in any one of claims 1 to 8, the method comprising:
manufacturing the base plate by adopting a numerical control machining method;
molding a plurality of the polishing beads;
and respectively embedding a plurality of polishing beads into the fixing grooves on the base plate, and bonding and fixing the polishing beads in the fixing grooves by using an adhesive.
10. The method of manufacturing a bristle-polished disk as claimed in claim 9, wherein after molding a plurality of the polishing beads, a layer of diamond grains is coated on the surfaces of the polishing beads by surface spraying or plating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010425673.7A CN111633577A (en) | 2020-05-19 | 2020-05-19 | Brush polishing disc and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010425673.7A CN111633577A (en) | 2020-05-19 | 2020-05-19 | Brush polishing disc and manufacturing method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111633577A true CN111633577A (en) | 2020-09-08 |
Family
ID=72324638
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010425673.7A Pending CN111633577A (en) | 2020-05-19 | 2020-05-19 | Brush polishing disc and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111633577A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113001422A (en) * | 2021-03-08 | 2021-06-22 | 天津职业技术师范大学(中国职业培训指导教师进修中心) | Pellet-stacked metal glass powder binding agent sintered internal-cooling grinding wheel and preparation method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000033548A (en) * | 1998-05-11 | 2000-02-02 | Nippon Seiko Kk | Washing brush |
| CN101184415A (en) * | 2005-06-29 | 2008-05-21 | 狮王株式会社 | Method and device for manufacturing brush and brush |
| CN201357361Y (en) * | 2009-03-06 | 2009-12-09 | 陈振保 | Bristle flying and grinding machine of long and short bristle toothbrush |
| CN101890678A (en) * | 2009-05-19 | 2010-11-24 | 好来化工(中山)有限公司 | Grinding wheel and polishing device with same |
| CN203676412U (en) * | 2014-01-11 | 2014-07-02 | 扬州宸泓刷业设备有限公司 | Three-dimensional bristle grinding device |
| CN207682206U (en) * | 2017-12-07 | 2018-08-03 | 东莞市桓昌塑胶五金制品有限公司 | A kind of novel toothbrush sanding ventilation grinding wheel |
| CN108741613A (en) * | 2018-05-25 | 2018-11-06 | 湖北智丰数控机械有限公司 | Round end twists hairbrush sanding mechanism |
-
2020
- 2020-05-19 CN CN202010425673.7A patent/CN111633577A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000033548A (en) * | 1998-05-11 | 2000-02-02 | Nippon Seiko Kk | Washing brush |
| CN101184415A (en) * | 2005-06-29 | 2008-05-21 | 狮王株式会社 | Method and device for manufacturing brush and brush |
| CN201357361Y (en) * | 2009-03-06 | 2009-12-09 | 陈振保 | Bristle flying and grinding machine of long and short bristle toothbrush |
| CN101890678A (en) * | 2009-05-19 | 2010-11-24 | 好来化工(中山)有限公司 | Grinding wheel and polishing device with same |
| CN203676412U (en) * | 2014-01-11 | 2014-07-02 | 扬州宸泓刷业设备有限公司 | Three-dimensional bristle grinding device |
| CN207682206U (en) * | 2017-12-07 | 2018-08-03 | 东莞市桓昌塑胶五金制品有限公司 | A kind of novel toothbrush sanding ventilation grinding wheel |
| CN108741613A (en) * | 2018-05-25 | 2018-11-06 | 湖北智丰数控机械有限公司 | Round end twists hairbrush sanding mechanism |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113001422A (en) * | 2021-03-08 | 2021-06-22 | 天津职业技术师范大学(中国职业培训指导教师进修中心) | Pellet-stacked metal glass powder binding agent sintered internal-cooling grinding wheel and preparation method thereof |
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Application publication date: 20200908 |