CN103213044B - High-precision sheet end face/side face grinding machine - Google Patents
High-precision sheet end face/side face grinding machine Download PDFInfo
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- CN103213044B CN103213044B CN201310154491.0A CN201310154491A CN103213044B CN 103213044 B CN103213044 B CN 103213044B CN 201310154491 A CN201310154491 A CN 201310154491A CN 103213044 B CN103213044 B CN 103213044B
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Abstract
The invention relates to a high-precision sheet end face/side face grinding machine. The high-precision sheet end face/side face grinding machine can finish grinding machining to the end face/the side face of a workpiece. The high-precision sheet end face/side face grinding machine is characterized in that a grinding head (137) is applied to conducting reciprocating motion along an X-axis direction, the workpiece to be grinded is fixedly placed vertical to the X-axis direction, and the face to be machined is parallel to the motion direction of the grinding head (137); and the grinding head (137) can further conduct the feed motion along a Y-axis direction, and the grinding head (137) can further conduct the forward/reverse rotational motion by itself; and therefore the grinding (137) conducts the reciprocating motion along the X-axis direction, and can further conduct the feed motion along the Y-axis direction and the rotational motion by itself at the same time. The high-precision sheet end face/side face grinding machine can grind a sheet after making contact with the sheet, and therefore automatic grinding machining is achieved. The high-precision sheet end face/side face grinding machine has the advantages of being high in machining accuracy, and capable of meeting the technical requirements of which straightness is 1500:0.002 millimeters and perpendicularity is 1500:0.015 millimeters.
Description
Technical field
The present invention relates to a kind of high-precision grinder, refer to a kind of high accuracy thin plate end faces/side faces grinding machine especially.
Background technology
Due to industrial requirement, need to carry out grinding to the end faces/side faces of thin plate, reach certain technical requirement to make the perpendicularity of the smoothness of the end faces/side faces of thin plate and linearity and adjacent both ends face/side.At present, manual carrying out all is adopted to the processing of the sidewall of the thin plate of larger area, the particularly thin plate of 0.1 ~ 40 millimeter, because its area is large, thickness is little, move and fixing time be easily out of shape and even fracture, grinding attachment adds end faces/side faces and crimping easily occurs or occurs the situations such as crackle man-hour, and a bit damage must not be caused to thin plate in existing a lot of customer requirement process, comprise the injuries such as scuffing, impression, such requirement proposes very large challenge to current manual production.Because human eye is limited to minute sized resolution, so the low precision of handwork, the parameter such as linearity, perpendicularity of processing the end faces/side faces of the thin plate obtained is often larger, can not meet the demand of user; And handwork efficiency is very low, production cost is high, and the market competitiveness is low; The potential safety hazard existed is also comparatively large, and the life of employee is more difficult to get guarantee safely.
Summary of the invention
The invention provides a kind of high accuracy thin plate end faces/side faces grinding machine, easily there is crimping to overcome adding end faces/side faces of existing in prior art or occur the situations such as crackle man-hour, precision is poor, the linearity of product and the problem such as perpendicularity can not reach requirement, production efficiency is low, production cost is high and potential safety hazard is large.
The present invention adopts following technical scheme:
With reference to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, high accuracy thin plate end faces/side faces grinding machine, it comprises lathe bed 1 and is assemblied in thin plate clamping working table 11, thin plate hold-down mechanism 12, bistrique motion workbench 13 and the operating mechanism 14 on this lathe bed 1.Protective cover 10 is arranged with outside this lathe bed 1.This thin plate clamping working table 11 comprises upper surface and is in the clamping working table 151 of same level and adds bench 152, and above-mentioned thin plate hold-down mechanism 12 is located at directly over this clamping working table 151; This thin plate hold-down mechanism 12 is for splint fixation, and this thin plate is placed on this thin plate clamping working table 11, and the end faces/side faces to be processed of this thin plate is parallel to X-direction; In addition, thin plate clamping working table 11 end face is fixed with positioning key 153, this positioning key 153 is arranged along above-mentioned Y direction, and above-mentioned hold-down mechanism corresponding position is provided with the locating slot 154 coordinated with this positioning key 153, and an end faces/side faces of this thin plate is close to this positioning key 153.This operating mechanism 14 is for handling grinding machine work, and this operating mechanism 14 is equipped can make 360 degree of lever arms 141 rotated along the horizontal plane, and this operating mechanism 14 is assemblied in the top of this lever arm 141 rotationally.This bistrique motion workbench 13 can along X-direction reciprocating be assemblied on this lathe bed 1, this bistrique motion workbench 13 is equiped with the bistrique 137 can making forward or reverse rotation, this bistrique 137 can do feed motion along the Y direction perpendicular to this X-direction.In addition, above-mentioned thin plate hold-down mechanism 12 is removably fixed with upper clip 121, above-mentioned thin plate clamping working table 11 is removably fixed with lower clamping piece 111, the end faces/side faces ground to be processed of this upper clip 121 and this lower clamping piece 111 grabbing thin plates is arranged, and the present invention preferably this upper clip 121 and lower clamping piece 111 is cork.
Above-mentioned thin plate hold-down mechanism 12 comprises pressure strip 122 and is assemblied in supporting device 123, fastening mechanism 124 and the switching mechanism 125 on above-mentioned thin plate clamping working table 11; This supporting device 123 moves up and down for driving this pressure strip 122, and this fastening mechanism 124 is for withholding this pressure strip 122, and this switching mechanism 125 does upper and lower upset for driving this pressure strip 122; Above-mentioned supporting device 123 comprises supporting driving device 155 and is vertically arranged at the first power output rod 156 of this supporting driving device 155, and the side of above-mentioned pressure strip 122 is along being assemblied on the top of this first power output rod 156 rotatably about an axis; Above-mentioned fastening mechanism 124 comprises fastening drive unit 157 and compresses button 158, this fastening drive unit 157 comprises the second power output rod 159 vertically arranged, this compression button 158 is installed on the end of this second power output rod 159 rotationally, this fastening drive unit 157 and above-mentioned supporting driving device 155 are arranged with working asynchronously, this fastening mechanism 124 also comprises buting iron 160, this buting iron 160 is provided with the skewed slot 161 can putting above-mentioned compression button 158, this compression button 158 is in U-shaped, and the end, one end compressing button 158 connects above-mentioned second power output rod 159; Above-mentioned switching mechanism 125 comprises overturning drive device 162 and is vertically arranged at the 3rd power output rod 163 of this overturning drive device 162,3rd power output rod 163 is provided with the tooth bar 164 vertically arranged, above-mentioned pressure strip 122 corresponding position is fixedly equiped with and this tooth bar 164 meshed gears 165.
Above-mentioned bistrique motion workbench 13 comprises base 131, slide plate 132, first drive unit 133 and grinding head body 134; This slide plate 132 can be assemblied on this base 131 transverse shifting, and this first drive unit 133 moves along Y direction for driving this slide plate 132, and this grinding head body 134 is fixedly assemblied on this slide plate 132, and above-mentioned bistrique 137 is assemblied in this grinding head body 134.Above-mentioned lathe bed 1 is fixed with the second drive unit 139 driving above-mentioned base 131 to slide along X-direction.
From the above-mentioned description to structure of the present invention, compared to the prior art, tool of the present invention has the following advantages: the layout setting of grinding machine of the present invention can the end faces/side faces of processing sheet well, processing precision is high, reach linearity 1500:0.002mm, the requirement of perpendicularity 1500:0.015mm; And the setting of this upper clip 121, lower clamping piece 111, make the end faces/side faces of grinding machine to large-area thin plate (particularly ultra thin plate) carry out processing and crimping can not occur or occur the situations such as crackle, undamaged grinding can be realized; The position being arranged so that workpiece of positioning key 153 is placed exists benchmark, ensure that the perpendicularity requirement of product; In addition, this grinding machine can realize Automatic-clamping/unclamp workpiece, and automaticity is high, and production efficiency obtains effective raising, and production cost have also been obtained reduction, and this grinding machine significantly reduces potential safety hazard, improves the safety assurance of operating personnel.
Accompanying drawing explanation
Fig. 1 is the main TV structure schematic diagram of grinding machine.
Fig. 2 is the left TV structure schematic diagram after protective cover removed by grinding machine.
Fig. 3 is the plan structure schematic diagram of grinding machine.
Fig. 4 is the enlarged drawing of the local X in Fig. 3.
Fig. 5 is the main TV structure schematic diagram of pressure strip and the clamping working table opened.
Fig. 6 is the main TV structure schematic diagram of closed pressure strip and clamping working table.
Detailed description of the invention
With reference to the accompanying drawings the specific embodiment of the present invention is described.
With reference to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, high accuracy thin plate end faces/side faces grinding machine, it comprises lathe bed 1 and is assemblied in thin plate clamping working table 11, thin plate hold-down mechanism 12, bistrique motion workbench 13 and the operating mechanism 14 on this lathe bed 1.Protective cover 10 is arranged with, to protect the safety coefficient of grinding machine and raising grinding machine outside this lathe bed 1.This thin plate clamping working table 11 comprises upper surface and is in the clamping working table 151 of same level and adds bench 152, and above-mentioned thin plate hold-down mechanism 12 is located at directly over this clamping working table 151; This thin plate hold-down mechanism 12 is for splint fixation, and this thin plate is placed on this thin plate clamping working table 11, and the end faces/side faces to be processed of this thin plate is parallel to X-direction; In addition, thin plate clamping working table 11 end face is fixed with positioning key 153, this positioning key 153 is arranged along above-mentioned Y direction, above-mentioned hold-down mechanism corresponding position is provided with the locating slot 154 coordinated with this positioning key 153, an end faces/side faces of this thin plate is close to this positioning key 153, workpiece to be processed is with this positioning key 153 for benchmark carries out placing and fixing, and the position being arranged so that workpiece of positioning key 153 is placed exists benchmark, ensure that the perpendicularity requirement of product.This operating mechanism 14 is for handling grinding machine work, and this operating mechanism 14 is equipped can make 360 degree of lever arms 141 rotated along the horizontal plane, and this operating mechanism 14 is assemblied in the top of this lever arm 141 rotationally.This bistrique motion workbench 13 can along X-direction reciprocating be assemblied on this lathe bed 1, this bistrique motion workbench 13 is equiped with the bistrique 137 can making forward or reverse rotation, this bistrique 137 can do feed motion along the Y direction perpendicular to this X-direction.In addition, above-mentioned thin plate hold-down mechanism 12 is removably fixed with upper clip 121, above-mentioned thin plate clamping working table 11 is removably fixed with lower clamping piece 111, the end faces/side faces ground to be processed of this upper clip 121 and this lower clamping piece 111 grabbing thin plates is arranged, and the present invention preferably this upper clip 121 and lower clamping piece 111 is cork.The layout setting of grinding machine of the present invention can the end faces/side faces of processing sheet well, processing precision is high, reach linearity 1500:0.002mm, (linearity is made up of shape (desirable contained shape), size (tolerance value), direction, position four elements in the requirement of perpendicularity 1500:0.015mm, for limiting the rectilinear form deviation in a plane, restricted quarter straight line form variations in one direction, the form variations of restricted quarter straight line in either direction; Perpendicularity evaluates the plumbness between straight line, between plane or between straight line and plane, one of them straight line or plane are metewands, and straight line can be straight line portion or the straight-line trajectory of sample, plane can be the planar section of sample or the plane of movement locus formation.); And the setting of this upper clip 121 and lower clamping piece 111, make the end faces/side faces of grinding machine to large-area thin plate (particularly ultra thin plate) carry out processing and crimping can not occur or occur the situations such as crackle, undamaged grinding can be realized; In addition, this grinding machine can realize Automatic-clamping/unclamp workpiece, and automaticity is high, and production efficiency obtains effective raising, and production cost have also been obtained reduction, and this grinding machine significantly reduces potential safety hazard, improves the safety assurance of operating personnel.
Above-mentioned thin plate hold-down mechanism 12 comprises pressure strip 122 and is assemblied in supporting device 123, fastening mechanism 124 and the switching mechanism 125 on above-mentioned thin plate clamping working table 11; This supporting device 123 moves up and down for driving this pressure strip 122, and this fastening mechanism 124 is for withholding this pressure strip 122, and this switching mechanism 125 does upper and lower upset for driving this pressure strip 122; Above-mentioned supporting device 123 comprises supporting driving device 155 and is vertically arranged at the first power output rod 156 of this supporting driving device 155, and the side of above-mentioned pressure strip 122 is along being assemblied on the top of this first power output rod 156 rotatably about an axis; Above-mentioned fastening mechanism 124 comprises fastening drive unit 157 and compresses button 158, this fastening drive unit 157 comprises the second power output rod 159 vertically arranged, this compression button 158 is installed on the end of this second power output rod 159 rotationally, this fastening drive unit 157 and above-mentioned supporting driving device 155 are arranged with working asynchronously, this fastening mechanism 124 also comprises buting iron 160, this buting iron 160 is provided with the skewed slot 161 can putting above-mentioned compression button 158, this compression button 158 is in U-shaped, and the end, one end compressing button 158 connects above-mentioned second power output rod 159; Above-mentioned switching mechanism 125 comprises overturning drive device 162 and is vertically arranged at the 3rd power output rod 163 of this overturning drive device 162,3rd power output rod 163 is provided with the tooth bar 164 vertically arranged, above-mentioned pressure strip 122 corresponding position is fixedly equiped with and this tooth bar 164 meshed gears 165.
Above-mentioned bistrique motion workbench comprises base 131, slide plate 132, first drive unit 133 and grinding head body 134; This slide plate 132 can be assemblied on this base 131 transverse shifting, and this first drive unit 133 does feed motion for driving this slide plate 132 along Y direction, and this grinding head body 134 is fixedly assemblied on this slide plate 132, and above-mentioned bistrique 137 is assemblied in this grinding head body 134.Above-mentioned lathe bed 11 is provided with the some chutes 135 be arranged in parallel along X-direction, and this base 131 activity is assemblied on this chute 135.Above-mentioned grinding head body 134 also comprises the rotary core shaft 136 of arranging along Y direction and the grinding wheel drive mitor 138 driving this rotary core shaft 136 forwards/reverse to rotate, above-mentioned bistrique 137 is emery wheel grinding-head 137, this emery wheel grinding-head 137 is fixedly assemblied on the end of this rotary core shaft 136, when grinding work is carried out, axis and this thin plate of this rotary core shaft 136 are in same level; Above-mentioned lathe bed 1 is fixed with the second drive unit 139 driving above-mentioned base 131 to slide along X-direction.
Finally, the working method of this grinding machine is as described below:
A. sheet workpiece is installed: lain in by sheet workpiece on the work-piece face of clamping working table 151, and on the sidewall leaning positioning key 153 of workpiece, for benchmark, workpiece is placed with positioning key 153.Manipulate above-mentioned operating mechanism 14, starting overturning drive device 162 makes the 3rd power output rod 163 move upward, under the promotion of tooth bar 164, said gear 165 does corresponding rotation, namely pressure strip 122 rotates until on horizontal plane around axle, now, two sides of pressure strip 122 are along being held by the first power output rod 156 and the second power output rod 159 respectively, and the work-piece face of pressure strip 122 bottom surface and clamping working table 151 is arranged in parallel; Next, till first power output rod 156, second power output rod 159 and the 3rd power output rod 163 synchronously move downward when the bottom surface of pressure strip 122 is pressed on workpiece with suitable pressure, in this process, second power output rod 159 drives compression button 158 to move downward, and is in the compression button 158 outwards routed up and inwardly overturns under the spacing promotion of skewed slot 161 and progressively fasten the edge, side of pressure strip 122; The bottom surface be synchronized with the movement to pressure strip 122 of the first power output rod 156, second power output rod 159 and the 3rd power output rod 163 stops with during the pressure pressing component upper surface of setting, and the clamping so far then completing workpiece is fixed.
B. grinding: manipulate above-mentioned operating mechanism 14, the second drive unit 139 is made to drive above-mentioned base 131 to move to initial station, first drive unit 133 drives slide plate 132 to move, emery wheel grinding-head 137 is made to be positioned on the optimal process position of Y direction, fixed glides 132 position in the Y-axis direction, second drive unit 139 drives above-mentioned base 131 by initial station along above-mentioned chute 135 displacement to stopping station, namely the processing of an end faces/side faces of sheet workpiece is completed, in this engineering, emery wheel grinding-head 137 grinding simultaneously upper clip 121, thin plate end faces/side faces and lower clamping piece 111, make the grinding face of three in the same plane.
C. removal sheet workpiece: the first power output rod 156, second power output rod 159 and the 3rd power output rod 163 synchronously move upward till compression button 158 is after Action of Gravity Field falls into skewed slot 161, then the second power output rod 159 moves downward, tooth bar 164 driven gear 165 rotates and makes pressure strip 122 upwards dig to certain gradient, and workpiece now can take out by clamping working table 151.
During next end faces/side faces of processing sheet workpiece, manufactured end faces/side faces can be aimed at positioning key 153, can ensure that the perpendicularity of two end faces/side faces reaches corresponding requirement like this.
Above are only the specific embodiment of the present invention, but design concept of the present invention is not limited thereto, all changes utilizing this design the present invention to be carried out to unsubstantiality, all should belong to the behavior of invading scope.
Claims (10)
1. high accuracy thin plate end faces/side faces grinding machine, is characterized in that: comprise lathe bed (1) and be assemblied in thin plate clamping working table (11), thin plate hold-down mechanism (12), bistrique motion workbench (13) and the operating mechanism (14) on this lathe bed (1); This thin plate hold-down mechanism (12) is parallel to the thin plate be placed on this thin plate clamping working table (11) of X-direction for fixing end faces/side faces to be processed, this operating mechanism (14) is for handling grinding machine work, this bistrique motion workbench (13) can along X-direction reciprocating be assemblied on this lathe bed (1), this bistrique motion workbench (13) is equiped with the bistrique (137) can making forward or reverse rotation, this bistrique (137) can do feed motion along the Y direction perpendicular to this X-direction;
Described thin plate hold-down mechanism (12) comprises pressure strip (122) and is assemblied in supporting device (123), fastening mechanism (124) and the switching mechanism (125) on described thin plate clamping working table (11); This supporting device (123) moves up and down for driving this pressure strip (122), and this fastening mechanism (124) is for withholding this pressure strip (122), and this switching mechanism (125) does upper and lower upset for driving this pressure strip (122);
Described supporting device (123) comprises supporting driving device (155) and is vertically arranged at first power output rod (156) of this supporting driving device (155), and the side of described pressure strip (122) is along being assemblied on the top of this first power output rod (156) rotatably about an axis;
Described fastening mechanism (124) comprises fastening drive unit (157) and compresses button (158), this fastening drive unit (157) comprises the second power output rod (159) vertically arranged, this compression button (158) is installed on the end of this second power output rod (159) rotationally, and this fastening drive unit (157) and described supporting driving device (155) synchronous working ground are arranged;
Described switching mechanism (125) comprises overturning drive device (162) and is vertically arranged at the 3rd power output rod (163) of this overturning drive device (162), 3rd power output rod (163) is provided with the tooth bar (164) vertically arranged, described pressure strip (122) corresponding position is fixedly equiped with and this tooth bar (164) meshed gears (165).
2. high accuracy thin plate end faces/side faces grinding machine as claimed in claim 1, it is characterized in that: described thin plate clamping working table (11) end face is fixed with positioning key (153), this positioning key (153) is arranged along described Y direction, and described hold-down mechanism corresponding position is provided with the locating slot (154) coordinated with this positioning key (153).
3. high accuracy thin plate end faces/side faces grinding machine as claimed in claim 1, it is characterized in that: described fastening mechanism (124) also comprises buting iron (160), this buting iron (160) is provided with can put the described skewed slot (161) compressing button (158), this compression button (158) is in U-shaped, and the end, one end compressing button (158) connects described second power output rod (159).
4. high accuracy thin plate end faces/side faces grinding machine as claimed in claim 1, is characterized in that: described bistrique motion workbench (13) comprises base (131), slide plate (132), the first drive unit (133) and grinding head body (134); This slide plate (132) can be assemblied on this base (131) transverse shifting, this first drive unit (133) moves along Y direction for driving this slide plate (132), this grinding head body (134) is fixedly assemblied on this slide plate (132), and described bistrique (137) is assemblied in this grinding head body (134).
5. high accuracy thin plate end faces/side faces grinding machine as claimed in claim 4, is characterized in that: described lathe bed (1) is fixed with the second drive unit (139) driving described base (131) to slide along X-direction.
6. high accuracy thin plate end faces/side faces grinding machine as claimed in claim 1, it is characterized in that: described operating mechanism (14) is equipped can make 360 degree of lever arms (141) rotated along the horizontal plane, and this operating mechanism (14) is assemblied in the top of this lever arm (141) rotationally.
7. high accuracy thin plate end faces/side faces grinding machine as claimed in claim 1, it is characterized in that: described thin plate hold-down mechanism (12) is removably fixed with upper clip (121), described thin plate clamping working table (11) is removably fixed with lower clamping piece (111), and the end faces/side faces ground to be processed of this upper clip (121) and this lower clamping piece (111) grabbing thin plates is arranged.
8. high accuracy thin plate end faces/side faces grinding machine as claimed in claim 7, is characterized in that: described upper clip (121) and lower clamping piece (111) are respectively cork upper clip (121) and cork lower clamping piece (111).
9. high accuracy thin plate end faces/side faces grinding machine as claimed in claim 1, it is characterized in that: described thin plate clamping working table (11) comprises upper surface and is in the clamping working table (151) of same level and adds bench (152), and described thin plate hold-down mechanism (12) is located at directly over this clamping working table (151).
10. high accuracy thin plate end faces/side faces grinding machine as claimed in claim 1, is characterized in that: be arranged with protective cover (10) outside described lathe bed (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310154491.0A CN103213044B (en) | 2013-04-28 | 2013-04-28 | High-precision sheet end face/side face grinding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310154491.0A CN103213044B (en) | 2013-04-28 | 2013-04-28 | High-precision sheet end face/side face grinding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103213044A CN103213044A (en) | 2013-07-24 |
| CN103213044B true CN103213044B (en) | 2015-03-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310154491.0A Expired - Fee Related CN103213044B (en) | 2013-04-28 | 2013-04-28 | High-precision sheet end face/side face grinding machine |
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| Country | Link |
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| CN (1) | CN103213044B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2649260Y (en) * | 2003-10-09 | 2004-10-20 | 李三通 | Stone side automatic grinding-polishing machine |
| CN2908033Y (en) * | 2006-03-27 | 2007-06-06 | 刘景国 | Artificial board edge grinding machine |
| CN201132285Y (en) * | 2007-11-06 | 2008-10-15 | 刘小辉 | Grinding head assembly for edge-grinding machine |
| DE102011018205B3 (en) * | 2011-04-13 | 2012-10-04 | Armin Hofmann | Clamping device for clamping workpieces, has clamping element connected with housing by connecting links, where clamping element is coupled with piston by other connecting links |
| CN203185143U (en) * | 2013-04-28 | 2013-09-11 | 南安市伟峰机械制造有限公司 | High-precision thin plate end face / side face grinding machine |
-
2013
- 2013-04-28 CN CN201310154491.0A patent/CN103213044B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2649260Y (en) * | 2003-10-09 | 2004-10-20 | 李三通 | Stone side automatic grinding-polishing machine |
| CN2908033Y (en) * | 2006-03-27 | 2007-06-06 | 刘景国 | Artificial board edge grinding machine |
| CN201132285Y (en) * | 2007-11-06 | 2008-10-15 | 刘小辉 | Grinding head assembly for edge-grinding machine |
| DE102011018205B3 (en) * | 2011-04-13 | 2012-10-04 | Armin Hofmann | Clamping device for clamping workpieces, has clamping element connected with housing by connecting links, where clamping element is coupled with piston by other connecting links |
| CN203185143U (en) * | 2013-04-28 | 2013-09-11 | 南安市伟峰机械制造有限公司 | High-precision thin plate end face / side face grinding machine |
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| CN103213044A (en) | 2013-07-24 |
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Granted publication date: 20150311 Termination date: 20160428 |