CN107214582B - Grinding gear disc and optical grinding and polishing machine - Google Patents
Grinding gear disc and optical grinding and polishing machine Download PDFInfo
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- CN107214582B CN107214582B CN201710538386.5A CN201710538386A CN107214582B CN 107214582 B CN107214582 B CN 107214582B CN 201710538386 A CN201710538386 A CN 201710538386A CN 107214582 B CN107214582 B CN 107214582B
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- grinding
- base
- disc
- tray
- planetary gear
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
- B24B13/005—Blocking means, chucks or the like; Alignment devices
- B24B13/0055—Positioning of lenses; Marking of lenses
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
The invention provides a grinding gear disc which comprises a base, a tray, a planetary gear train and a grinding disc, wherein the tray and the planetary gear train are coaxially arranged between the base and the grinding disc; the planetary gear train comprises an inner sun gear, an outer sun gear and a plurality of planet gears; the inner sun wheel, the outer sun wheel and the plurality of planet wheels are detachably connected with the base; the tray is positioned in the center of the planetary gear train and used for supporting and driving the grinding disc above the planetary gear train, and the distance between the tray and the base is adjustable. According to the grinding gear disc, the inner sun wheel, the outer sun wheel and the planet wheels are detachably mounted with the base, and the distance of the tray relative to the base is adjustable, so that the plane distance between the planet wheels and the base can be flexibly set in the whole grinding gear disc, the polishing operation of the same set of equipment on workpieces with different thicknesses is realized, the equipment cost is greatly saved, the time for replacing the equipment is shortened, and the production efficiency and the economic benefit are improved. On the basis, the invention also provides an optical grinding and polishing machine.
Description
Technical Field
The invention relates to the technical field of optical polishing equipment, in particular to a grinding gear disc and an optical grinding and polishing machine.
Background
Compared with the conventional grinding and polishing, the optical polishing has higher requirements on precision and roughness, and the roughness after polishing reaches the level of the wavelength of visible light.
In the prior art, an optical polishing machine, particularly a double-sided polishing machine, polishes a workpiece by using a planetary wheel. The base is fixed, a planetary gear train is arranged between the grinding disc on the upper side and the base on the lower side, an inner sun gear in the planetary gear train is fixedly arranged on the base, an outer sun gear is fixedly arranged on the base and driven to rotate by a motor, and the two gears cannot be flexibly replaced. In addition, the diameter and thickness of the plurality of planetary gears between the inner and outer sun gears cannot be adjusted, and particularly, the range in which the thickness thereof can be changed is limited by the size of the inner and outer sun gears.
Disclosure of Invention
The invention aims to provide a grinding gear disc and an optical grinding and polishing machine, and aims to solve the problems that the optical grinding and polishing equipment in the prior art is not flexible to use and cannot be applied to polishing and polishing of workpieces with different thicknesses.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a grinding gear disc which comprises a base, a tray, a planetary gear train and a grinding disc, wherein the tray and the planetary gear train are coaxially arranged between the base and the grinding disc; the planetary gear train comprises an inner sun gear, an outer sun gear and a plurality of planet gears; the inner sun wheel, the outer sun wheel and the planet wheels are detachably connected with the base; the tray is positioned in the center of the planetary gear train and used for bearing and driving the grinding disc above the planetary gear train, and the distance of the tray relative to the base is adjustable.
Further, the inner sun gear is a driving wheel, and the outer sun gear is fixedly installed on the base through screws. The technical effect of the technical scheme is as follows: the inner sun wheel is positioned in the center and is arranged as a driving wheel, the operation is stable, and meanwhile, the torque transmission is more direct through the connection of the tray and the grinding disc on the upper side. In addition, the torque of the driving motor is transmitted from the lower part of the inner sun gear, so the inner sun gear can be fixedly installed with the rotating disc of the driving motor through bolts. And because the outer sun wheel is detachably connected with the base, and the installation position of the outer sun wheel directly influences the grinding precision with the position relation of the inner sun wheel and the plurality of planet wheels. Therefore, compared with connection modes such as clamping and buckling, the grinding operation of the outer sun wheel pair fixedly installed by the screws has higher precision guarantee.
Further, when the planetary gear train is horizontally placed, a plurality of threaded holes with vertical axes are formed in the base, and through holes are formed in the positions, corresponding to the threaded holes, of the outer sun gear. The technical effect of the technical scheme is as follows: the threaded hole vertically arranged on the base and the through hole vertically arranged corresponding to the outer sun gear are fixed by screws, so that the position of the outer sun gear is fixed in the vertical direction, and the outer sun gear is prevented from moving in the horizontal direction.
Further, when the planetary gear train is placed horizontally, a plurality of threaded holes with horizontal axes are formed in the side wall of the base, and through holes are formed in the positions, corresponding to the threaded holes, of the outer sun gear. The technical effect of the technical scheme is as follows: the outer sun gear is buckled on the boss of the base at the bottom, and then the outer sun gear is fixed with the base through the threaded hole, the through hole and the screw which are horizontally arranged, so that the fixing effect of the outer sun gear in the rotating direction is more effective.
Further, the outer sun wheel is clamped with the base; a clamping groove with an upward opening is formed in the base, and clamping teeth are arranged on the outer sun wheel corresponding to the clamping groove. The technical effect of the technical scheme is as follows: the outer sun gear is installed through the clamping teeth and the clamping grooves, the dismounting is rapid, and the replacement efficiency is high.
Furthermore, the upper surface of the tray is provided with a plurality of blind holes, and the lower part of the grinding disc is provided with clamping jaws in a corresponding position. The technical effect of the technical scheme is as follows: the blind hole is matched with the clamping jaw and used for transmitting the torque of the driving motor and driving the grinding disc on the upper side to rotate. And assists in balancing the levelness of the upper side grinding disc.
Further, the jaws are arranged to be adjustable with respect to the elongated length of the grating disc. The technical effect of the technical scheme is as follows: because the length of jack catch can be adjusted, do benefit to interior sun gear, outer sun gear and a plurality of planet wheel of quick replacement downside. Meanwhile, the maintenance and overhaul of the cooling system and the pressure control system are facilitated.
Further, the inner sun gear, the outer sun gear and the plurality of planet gears are all helical gears. The technical effect of the technical scheme is as follows: compared with a conventional straight gear, the helical gear has the advantages of good meshing performance, large contact ratio, compact structure, stable transmission and greater advantages in grinding and polishing.
Further, the number of the planet wheels is 3-6. The technical effect of the technical scheme is as follows: the quantity of planet wheel is according to the difference of work piece quantity, and the difference of inside and outside sun gear diameter can set up to a plurality ofly, according to the actual work experience, adopts the design of 4 or 5 planet wheels most reasonable on transmission efficiency and grinding efficiency.
The invention also provides an optical grinding and polishing machine, and the polishing component of the optical grinding and polishing machine is provided with the grinding gear disc.
The invention has the beneficial effects that:
1. the interior sun gear, outer sun gear and a plurality of planet wheel of grinding the toothed disc all can dismantle with the base and be connected, so, can grind the size of the required pressure of work piece according to the diameter size and the thickness size of work piece in the grinding and polishing, select interior sun gear, outer sun gear and a plurality of planet wheel that thickness is different to satisfy actual need.
2. Because of the reasons, the polishing operation that the same set of equipment adapts to workpieces with different thicknesses is realized by selecting different inner sun gears, outer sun gears and a plurality of planet gears through the whole set of grinding gear plate, so that the equipment cost is greatly saved, and the time for replacing the equipment is shortened.
3. The optical grinding polisher is provided with a grinding gear disc which can be used for replacing different planet wheels, an inner sun wheel and an outer sun wheel, so that the production efficiency of the optical grinding equipment is obviously improved, and the equipment cost of optical grinding is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic structural diagram of a grinding gear plate according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a grinding gear plate according to a second embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a grinding gear plate (with the grinding plate removed) provided by a third embodiment of the invention;
fig. 4 is a partial enlarged view at I in fig. 1.
Reference numerals:
1-a base; 2-a tray; 3-grinding disc;
4-an inner sun gear; 5-outer sun gear; 6-planet wheel;
7-a screw; 8-a through hole; 9-a card slot;
10-latch; 11-blind holes; 12-claws.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The first embodiment is as follows:
this embodiment provides a grinding gear dish, wherein: fig. 1 is a schematic structural diagram of a grinding gear plate according to an embodiment of the present invention.
As shown in fig. 1, the grinding disk of the present embodiment includes a base 1, a tray 2, a planetary gear train, and a grinding disc 3. Specifically, the tray 2 and the planetary gear train are coaxially installed between the base 1 and the grinding disc 3; wherein the planetary gear train comprises an inner sun gear 4, an outer sun gear 5 and a plurality of planet gears 6; the inner sun wheel 4, the outer sun wheel 5 and the plurality of planet wheels 6 are detachably connected with the base 1;
a tray 2 is positioned at the center of the planetary gear train and is used for bearing and driving a grinding disc 3 above the planetary gear train, and the distance of the tray 2 relative to the base 1 can be adjusted.
The inner sun gear 4 is a driving wheel, and the outer sun gear 5 is fixedly arranged on the base 1 through a screw 7.
When the planetary gear train is horizontally arranged, a plurality of threaded holes with vertical axes are arranged on the base 1, and through holes 8 are arranged at positions of the outer sun gear 5 corresponding to the threaded holes. The outer sun wheel 5 is fixedly arranged on the base 1 through a screw 7, a threaded hole and a through hole 8.
In this embodiment: the inner sun gear 4 is arranged in the center and is set as a driving wheel, the operation is stable, and meanwhile, the torque transmission is more direct because the tray 2 is connected with the grinding disc 3 on the upper side. In addition, the torque of the driving motor is transmitted from the lower part of the inner sun gear 4, so the inner sun gear 4 can be fixedly installed with the rotating disc of the driving motor through bolts. And, because outer sun gear 5 and base 1 detachable connection, and its mounted position and inner sun gear 4, the positional relationship of a plurality of planet wheels 6 directly influence the precision of grinding. Therefore, compared with connection modes such as clamping and buckling, the outer sun gear 5 fixedly installed by the screw 7 has more guarantee on precision for grinding operation. It should be noted that the distance between the tray 2 and the base 1 can be adjusted, that is, the distance between the grinding disc 3 on the upper side and the base 1 below can also be adjusted, so that the planet wheels 6 with different thicknesses can be replaced conveniently, and the grinding operation of workpieces with different thicknesses can be satisfied.
In particular, the base 1 is vertically provided with a threaded hole, the outer sun gear 5 corresponds to the vertically provided through hole 8, and the screw 7 is used for fixing, so that the position of the outer sun gear 5 is fixed in the vertical direction, and the movement of the outer sun gear 5 is prevented in the horizontal direction.
In the prior art, an optical polishing machine, particularly a double-sided polishing machine, polishes a workpiece by using a planet wheel 6. Wherein, base 1 is fixed, sets up planet wheel 6 between the base 1 of the mill 3 of upside and downside and is restrainted, and interior sun gear 4 in planet wheel 6 is fixed to be set up in base 1, and outer sun gear 5 fixed mounting is in base 1 and by the motor drive rotation, and two gears can't be changed in a flexible way. In addition, the diameter and thickness of the plurality of planetary gears 6 between the inner and outer sun gears 5 cannot be adjusted, and particularly, the range in which the thickness thereof can be changed is limited by the size of the inner and outer sun gears 5.
The grinding gear disc can better solve the problems. Firstly, the inner sun wheel 4, the outer sun wheel 5 and the plurality of planet wheels 6 of the grinding gear disc are detachably connected with the base 1, so that the inner sun wheel 4, the outer sun wheel 5 and the plurality of planet wheels 6 with different thicknesses can be selected according to the diameter and the thickness of a workpiece and the pressure required by the grinding workpiece in grinding and polishing so as to meet the actual requirements. Secondly, because above-mentioned reason, the polishing operation of different thickness work pieces of same equipment adaptation is realized to different interior sun gear 4, outer sun gear 5 and a plurality of planet wheel 6 of whole set of grinding toothed disc accessible selection, so, practiced thrift equipment cost greatly, reduced the time of change equipment.
Example two:
fig. 2 is a schematic structural diagram of a grinding gear plate according to a second embodiment of the present invention. As shown in fig. 2, the grinding disk of the present embodiment includes a base 1, a tray 2, a planetary gear train, and a grinding disk 3. Specifically, the tray 2 and the planetary gear train are coaxially installed between the base 1 and the grinding disc 3; wherein the planetary gear train comprises an inner sun gear 4, an outer sun gear 5 and a plurality of planet gears 6; the inner sun wheel 4, the outer sun wheel 5 and the plurality of planet wheels 6 are detachably connected with the base 1;
a tray 2 is positioned at the center of the planetary gear train and is used for bearing and driving a grinding disc 3 above the planetary gear train, and the distance of the tray 2 relative to the base 1 can be adjusted.
The inner sun gear 4 is a driving wheel, and the outer sun gear 5 is fixedly arranged on the base 1 through a screw 7.
When the planetary gear train is horizontally placed, a plurality of threaded holes with horizontally arranged axes are arranged on the side wall of the base 1, and through holes 8 are arranged at the positions of the outer sun gear 5 corresponding to the threaded holes. The outer sun wheel 5 is fixedly arranged on the base 1 through a screw 7, a threaded hole and a through hole 8.
In this embodiment: the outer sun gear 5 is buckled on a boss of the base 1 at the bottom, and the outer sun gear 5 is fixed with the base 1 through a threaded hole, a through hole 8 and a screw 7 which are horizontally arranged, so that the fixing effect of the outer sun gear 5 in the rotating direction is more effective.
Example three:
fig. 3 is a schematic structural diagram of a grinding gear disc (after the grinding disc 3 is removed) provided by a third embodiment of the invention. As shown in fig. 3, the grinding disk of the present embodiment includes a base 1, a tray 2, a planetary gear train, and a grinding disk 3. Specifically, the tray 2 and the planetary gear train are coaxially installed between the base 1 and the grinding disc 3; wherein the planetary gear train comprises an inner sun gear 4, an outer sun gear 5 and a plurality of planet gears 6; the inner sun wheel 4, the outer sun wheel 5 and the plurality of planet wheels 6 are detachably connected with the base 1;
a tray 2 is positioned at the center of the planetary gear train and is used for bearing and driving a grinding disc 3 above the planetary gear train, and the distance of the tray 2 relative to the base 1 can be adjusted.
In this embodiment: the outer sun gear 5 is installed through the clamping teeth 10 and the clamping grooves 9, the dismounting is rapid, and the replacement efficiency is high.
In any of the above embodiments, the upper surface of the tray 2 is provided with a plurality of blind holes 11, and the lower part of the grinding disc 3 is provided with claws 12 at corresponding positions. In this embodiment, the blind hole 11 is matched with the claw 12 to transmit the torque of the driving motor, drive the rotation of the upper grinding disc 3 and assist in balancing the levelness of the upper grinding disc 3.
Further, the elongated length of the jaws 12 relative to the grinding disc 3 is arranged to be adjustable. In this embodiment, the length of the jaws 12 can be adjusted, so that the inner sun wheel 4, the outer sun wheel 5 and the plurality of planet wheels 6 on the lower side can be replaced quickly. Meanwhile, the maintenance and overhaul of the cooling system and the pressure control system are facilitated.
Fig. 4 is a partial enlarged view at I in fig. 1. As shown in fig. 4, in any of the above embodiments, the inner sun gear 4, the outer sun gear 5, and the plurality of planet gears 6 are all helical gears. Compared with a conventional straight gear, the helical gear has the advantages of good meshing performance, large contact ratio, compact structure, stable transmission and greater advantages in grinding and polishing.
In any of the above embodiments, the number of the planet wheels 6 is 3-6. The number of planet wheels 6 can be set to be a plurality of according to the difference of work piece quantity, the difference of inside and outside sun gear 5 diameter, according to the actual work experience, adopts 4 or 5 design of planet wheels 6 most reasonable on transmission efficiency and grinding efficiency.
The invention also provides an optical grinding and polishing machine, and the grinding and polishing component of the optical grinding and polishing machine is provided with the grinding gear disc.
In conclusion, the optical grinding and polishing machine is provided with the grinding gear discs which can be detached and replaced with the different planet wheels 6, the inner sun wheel 4 and the outer sun wheel 5, and is suitable for the rapid polishing of workpieces with different thicknesses, so that the production efficiency of the optical grinding equipment is obviously improved, and the equipment cost of optical grinding is reduced.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. A grinding wheel disc comprising a base, a tray, a planetary gear train and a grinding disc, the tray and the planetary gear train being coaxially mounted between the base and the grinding disc;
the planetary gear train comprises an inner sun gear, an outer sun gear and a plurality of planet gears; the inner sun wheel, the outer sun wheel and the planet wheels are detachably connected with the base;
the tray is positioned at the center of the planetary gear train and used for bearing and driving the grinding disc above the planetary gear train, and the distance of the tray relative to the base is adjustable;
when the planetary gear train is horizontally placed, a plurality of threaded holes with horizontally arranged axes are formed in the side wall of the base, and through holes are formed in the positions, corresponding to the threaded holes, of the outer sun gear;
the inner sun wheel, the outer sun wheel and the planet wheels are all helical gears;
the upper surface of the tray is provided with a plurality of blind holes, and the lower part of the grinding disc is provided with clamping jaws corresponding to the positions;
the jaws are arranged to be adjustable in relation to the elongated length of the grating disc.
2. The grinding wheel disc of claim 1, wherein the inner sun is a drive wheel and the outer sun is fixedly mounted to the base by screws.
3. A grinding wheel disc according to claim 1, characterised in that the number of planet wheels is 3-6.
4. An optical lapping and polishing machine comprising the lapping gear plate according to any one of claims 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710538386.5A CN107214582B (en) | 2017-07-04 | 2017-07-04 | Grinding gear disc and optical grinding and polishing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710538386.5A CN107214582B (en) | 2017-07-04 | 2017-07-04 | Grinding gear disc and optical grinding and polishing machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107214582A CN107214582A (en) | 2017-09-29 |
| CN107214582B true CN107214582B (en) | 2020-03-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710538386.5A Active CN107214582B (en) | 2017-07-04 | 2017-07-04 | Grinding gear disc and optical grinding and polishing machine |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107498453A (en) * | 2017-10-25 | 2017-12-22 | 德清凯晶光电科技有限公司 | A kind of twin grinder for cylinder chip |
| CN110315425B (en) * | 2019-07-10 | 2020-08-28 | 衢州学院 | Grinding equipment for free abrasive of sapphire wafer |
| CN117207069B (en) * | 2023-11-08 | 2024-01-23 | 苏州博宏源机械制造有限公司 | Wafer polishing disc surface correction device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09239657A (en) * | 1996-03-04 | 1997-09-16 | Speedfam Co Ltd | Polishing device |
| CN1772437A (en) * | 2004-11-12 | 2006-05-17 | 卢建伟 | Grinding process |
| CN203438062U (en) * | 2013-08-16 | 2014-02-19 | 深圳市普盛旺科技有限公司 | Plane grinding machine for mobile phone glass |
| CN206084735U (en) * | 2016-08-31 | 2017-04-12 | 昆山捷若尔精密机械有限公司 | Glass plane fixes a position grinding jig |
| CN206253995U (en) * | 2016-11-14 | 2017-06-16 | 蓝思科技（长沙）有限公司 | A kind of grinding machine sun gear expansion fixture |
| CN207027159U (en) * | 2017-07-04 | 2018-02-23 | 希尔维斯特·本杰明 | A kind of tooth lapping wheel disc and optical grinding polishing machine |
-
2017
- 2017-07-04 CN CN201710538386.5A patent/CN107214582B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09239657A (en) * | 1996-03-04 | 1997-09-16 | Speedfam Co Ltd | Polishing device |
| CN1772437A (en) * | 2004-11-12 | 2006-05-17 | 卢建伟 | Grinding process |
| CN203438062U (en) * | 2013-08-16 | 2014-02-19 | 深圳市普盛旺科技有限公司 | Plane grinding machine for mobile phone glass |
| CN206084735U (en) * | 2016-08-31 | 2017-04-12 | 昆山捷若尔精密机械有限公司 | Glass plane fixes a position grinding jig |
| CN206253995U (en) * | 2016-11-14 | 2017-06-16 | 蓝思科技（长沙）有限公司 | A kind of grinding machine sun gear expansion fixture |
| CN207027159U (en) * | 2017-07-04 | 2018-02-23 | 希尔维斯特·本杰明 | A kind of tooth lapping wheel disc and optical grinding polishing machine |
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| CN107214582A (en) | 2017-09-29 |
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