CN201044945Y - End milling cutter bit grinder - Google Patents

End milling cutter bit grinder Download PDF

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Publication number
CN201044945Y
CN201044945Y CNU200720146568XU CN200720146568U CN201044945Y CN 201044945 Y CN201044945 Y CN 201044945Y CN U200720146568X U CNU200720146568X U CN U200720146568XU CN 200720146568 U CN200720146568 U CN 200720146568U CN 201044945 Y CN201044945 Y CN 201044945Y
Authority
CN
China
Prior art keywords
mill
cutter
ing
emery wheel
drill
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.)
Expired - Fee Related
Application number
CNU200720146568XU
Other languages
Chinese (zh)
Inventor
徐永欣
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MINGYANG MECHINE STOCK CO Ltd
Original Assignee
MINGYANG MECHINE STOCK CO Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by MINGYANG MECHINE STOCK CO Ltd filed Critical MINGYANG MECHINE STOCK CO Ltd
Priority to CNU200720146568XU priority Critical patent/CN201044945Y/en
Application granted granted Critical
Publication of CN201044945Y publication Critical patent/CN201044945Y/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

Disclosed is a grinder for a face-mill and a drill head. A machine bench is provided with a drill-head abrasive wheel, a face-mill abrasive wheel, a drill-head position regulating seat, a drill-head fixed seat, a drill-head position adjusting handle, a face-mill abrasive wheel and face-mill high-low position sliding blocks. A scale ring and a locating pin are disposed at the front end, a fore-and-aft feeding handle wheel connected to a feeding comer-turning shaft is disposed on an end surface of the machine bench, and two positioning balls and a corner-turning positioning block are further mounted on the end surface of the machine bench. The corner-turning positioning block is in linkage with a positioning spring. The other end surface of the machine bench is equipped with a left feeding handle wheel and a right feeding handle wheel which are connected to a rotating bearing and a driving board on which a ball bearing is disposed. When the left feeding handle wheel and the right feeding handle wheel are operated, the ball bearing mounted on the driving board presses projections of an abrasive wheel revolving bed which is connected with the corner-turning positioning block to eccentrically feed left and right. Further, owing to that an abrasive motor is disposed on the abrasive wheel revolving bed, the angle of drill-head abrasive wheel or the face-mill abrasive wheel can be conveniently adjusted. In the time of grinding the face-mill or the drill head, the grinding angle and position can be regulated.

Description

A kind of end mill(ing) cutter, drill grinder
Technical field
The utility model relates to a kind of machinery tools, refers to the grinder of rapid abrasive drill of a kind of energy and end mill(ing) cutter especially.
Background technology
General purpose tool machinery use drill bit or milling cutter are very usual, no matter various drilling machine or electronic hand-held tool all often use drill bit to carry out drilling and cut processing, and drill bit is often after using a period of time, because of using abrasion to make the drill bit passivation, cause drill bit drilling running bad, need to such an extent that grind this drill bit again.And milling machine is to utilize the milling cutter of rotation to carry out the processing of a plane or contoured surface, in more detail, milling cutter is to carry out circular cutting movement, and the machined article that is fixed on the board then carries out three displacement, and in the stage of rough milling is to utilize to rough mill milling cutter, is to utilize the finish-milling milling cutter in the finish-milling stage.In any case milling cutter must close generation loss to a certain degree, and how recover the acutance of drill bit and milling cutter after using length, general many normal direct drill bit and milling cutters with abrasion wheel grinding passivation.Yet the master craftsman who is skilled in technique must rely on rich experience and a twist of the wrist when utilizing grinder abrasive drill and milling cutter; But for abrasive drill and milling cutter lack of skill person, not only must expend many times and just may finish drill bit and milling cutter are ground sharp work again, and one but may cause the damage of drill bit and milling bit not for a short time.
If instrument drill bit and milling cutter mechanically uses a period of time and passivation, except with hand-held with drill bit or milling cutter on grinding wheel, again blade and each nose angle are ground sharp keen, though the machine of existing on the market at present automatic grinding drill bit and milling cutter, can a large amount of fast automatic grinding drill bit or milling cutter.For example: utilize the general-purpose grinding machine, no doubt can reduce the eliminating the amount of changing of milling cutter during the reconditioning milling cutter and help the reduction of cost, yet, manually rising now salary day, this way can not be fallen for cost veritably.Because utilize the general-purpose grinding machine to come the reconditioning milling cutter to need to a certain degree grinding technique, just can control the angle of depth of cut and reconditioning well, so the corresponding cost that produces of the time of reconditioning milling cutter and manpower institute spends, and may not be certain to be lower than and newly purchases a new milling cutter; Yet this machine institute palpus cost is very high, mode of operation is complicated, and required accessory is various, and for the user who does not generally need a large amount of abrasive drills and milling cutter, the grinding that purchase general-purpose grinding machine carries out cutter does not meet economic benefit really.So the design people supervises in this, the utility model is created in research and development, can utilize pattern simple to operate of the present utility model easily and then grind drill bit and milling cutter sharp rapidly in order to the user.
The utility model content
The purpose of this utility model provides a kind of end mill(ing) cutter, drill grinder, can grind the drill bit and the end mill(ing) cutter of all size easy, rapidly.
For this reason, solution of the present utility model is: a kind of end mill(ing) cutter, drill grinder, establish a slotted eye in board face appropriate position, the emery wheel revolving bed that a lower edge has projection is set in the slotted eye, a set bolt and drill bit emery wheel and end mill(ing) cutter emery wheel are set on the emery wheel revolving bed; Another appropriate position is provided with and sets firmly a pneumatic cylinder feed shaft on an end mill(ing) cutter high and low position slide block, the end mill(ing) cutter high and low position slide block and the syllogic lifting is fixedly turned round and handle on the board face, pneumatic cylinder feed shaft end is provided with the end mill(ing) cutter chuck of bare terminal end milling cutter, and its front end is provided with limb; On another relative board face of end mill(ing) cutter high and low position slide block, being provided with one has bit location to adjust handle to adjust seat with clamping and the bit location of adjusting bit location; Appropriate position, board face upper surface be provided with make the emery wheel revolving bed do before and after displacement front and back feeding handwheel, make the emery wheel revolving bed make the left and right sides feeding handwheel and the front and back feeding handwheel of left and right displacement; Board inside also is provided with emery wheel revolving bed projection and is connected with feeding corner axle, feeding corner axle spring, place kick, retainer spring, drive plate, swivel bearing, corner locating piece.
Described board table top appropriate position is provided with emery wheel revolving bed projection that an emery wheel revolving bed extends and feeding corner axle and corner locating piece and retainer spring and is set firmly the slotted eye that is connected.
The feeding corner axle that the end of described front and back feeding handwheel connection board inside is provided with feeding corner axle spring makes the front and back displacement in the slotted eye scope of whole emery wheel revolving bed to drive the emery wheel revolving bed projection that connects on it.
Described left and right sides feeding handwheel forces a drive plate when making the swivel bearing forward impelling.
Described drive plate end is pivoted a ball bearing with compacting corner locating piece, and being connected with the retainer spring that is installed in the board bottom on the corner locating piece, left and right sides feeding handwheel is subjected to the draw of spring strength and then makes whole emery wheel revolving bed left and right displacement in the slotted eye scope when making swivel bearing force drive plate forward.
The pneumatic cylinder feed shaft that end mill high and low position slide block which is provided with the end mill(ing) cutter front and back displacement on the terminal end mill(ing) cutter chuck of control is established in described board face top,
Described pneumatic cylinder feed shaft front end is provided with limb and alignment pin.
Described end mill(ing) cutter high and low position slide block is provided with that lifting is fixedly turned round and the lifting fixed bar, and the pneumatic cylinder feed shaft switching position up and down on it is set.
Described bit location adjustment seat is provided with the drill bit holder and bit location is adjusted handle, and the drill bit holder can be dismantled.
Described feeding corner axle spring is pivoted with two place kick that make corner locating piece deviation angle.
Adopt such scheme, because board of the present utility model top is provided with the emery wheel revolving bed, be mounted with drill bit emery wheel and end mill(ing) cutter emery wheel on it, and bit location is set on board adjusts seat, drill bit holder and bit location and adjust handle, when abrasive drill, the angle of drill bit and drill bit emery wheel contact-making surface is adjusted in displacement up and down easily, grinds various drill bit; Other board is provided with end mill(ing) cutter emery wheel, feed slide block and 3 segmentation liftings and fixedly turns round and handle, sets firmly a pneumatic cylinder feed shaft on it, and front end is provided with limb, to grind the end mill(ing) cutter of different sword numbers; Establish a spiral-guide adjusting device on the board in addition, with the helical angle and the spiral back rake angle of abrasive tip milling cutter; The board end is provided with a front and back feeding handwheel, the feeding corner axle of junctor table top below, and this feeding corner axle connects a place kick, so before and after the operation during feeding handwheel, the displacement before and after whole emery wheel revolving bed carries out with respect to board, adjustment abrasion site; Run through again on the emery wheel revolving bed projection of slotted eye on the board face in conjunction with a corner locating piece, operation left and right sides feeding handwheel makes the ball bearing on the drive plate do straight-line displacement in the end of corner locating piece, and because of the corner locating piece spring that is positioned is held, so be driven again simultaneously ball bearing on the plate prop up only need adjust the corner locating piece then can adjust easily and control before and after feed precision, eccentric feeding about the emery wheel revolving bed carries out with respect to board simultaneously, when abrasive tip milling cutter or drill bit, adjust and grind the angle position, so the easy part configuration of the utility model utilization just can be rapidly, the accurate end mill(ing) cutter of realizing, the grinding of drill bit.
Description of drawings
Fig. 1 is a stereogram of the present utility model;
Fig. 2 is a upward view of the present utility model;
Fig. 3 is a left side of the present utility model cross section view;
Fig. 4 is the schematic diagram that bit location of the present utility model is adjusted seat and drill bit holder;
The schematic diagram that cooperates the spiral-guide adjusting device when Fig. 5 is the utility model abrasive tip milling cutter.
The main element symbol description
10 boards, 22 power switches, 30 pneumatic cylinder feed shafts
40 liftings of 32 limbs, 36 end mill(ing) cutter chucks are fixedly turned round
42 lifting fixed bars, 44 spiral-guides are adjusted screw
46 end mill(ing) cutter high and low position slide blocks, 48 spiral-guide adjusting devices
50 front and back feeding handwheels, 51 rewind down handles
60 alignment pins, 62 bit location are adjusted seat
66 drill bit holders, 68 bit location are adjusted handle
70 drill bits 72 are made lamp 80 emery wheel revolving beds
82 emery wheel revolving bed set bolts, 84 drill bit emery wheels
86 end mill(ing) cutter emery wheels, 88 left and right sides feeding handwheels, 89 end mill(ing) cutters
90 retainer springs, 91 place kick, 92 feeding corner axles
93 slotted eyes, 94 drive plates, 96 feeding corner axle springs
97 swivel bearings, 98 ball bearings, 99 corner locating pieces
The specific embodiment
A kind of end mill(ing) cutter and drill grinder, utilize the emery wheel revolving bed that projection is arranged under being provided with on the board to be mounted with drill bit emery wheel and end mill(ing) cutter emery wheel on it, and bit location is set on board adjusts seat, on it and collocation drill bit holder and bit location adjust handle, can be when abrasive drill, the angle of abrasive drill and drill bit emery wheel contact-making surface is desired in displacement adjustment up and down easily, and then grind various spiral bit smoothly, solid center bit, the cement drill bit, subland drill, centre drill, left-handed drill bit, shovel brill etc., especially drill bit holder of the present utility model can grip the drill bit of Any shape, do not need to buy a lot of big and small anchor clamps and change because desiring the abrasive drill size, the collet chuck that more needn't spend a lot of times to go to seek suitable dimension comes clamping drilling bit.Other board is provided with end mill(ing) cutter emery wheel and feed slide block and 3 segmentation liftings and fixedly turns round and handle, set firmly a pneumatic cylinder feed shaft on it, this pneumatic cylinder feed shaft end is provided with the end mill(ing) cutter chuck in order to the bare terminal end milling cutter, and front end is provided with limb in order to the end mill(ing) cutter that grinds different sword numbers; On the board and establish the spiral-guide engagement positions of withering, helical angle and spiral back rake angle in order to the abrasive tip milling cutter, and the board end is provided with a front and back feeding handwheel, the feeding corner axle at its concealed space place, junctor table top below, this feeding corner axle, connect a place kick, its afterbody also is provided with feeding corner axle spring, so must make the displacement of whole emery wheel revolving bed before and after carrying out with respect to board before and after the operation during feeding handwheel.And because of on the emery wheel revolving bed projection that runs through slotted eye on the board face and in conjunction with a corner locating piece, and be installed in the retainer spring of board bottom because of corner locating piece connection one, so operation left and right sides feeding handwheel is because of being connected with the drive plate that swivel bearing and afterbody have ball bearing, so can make the ball bearing on the drive plate do straight-line displacement in the end of corner locating piece, and because of the corner locating piece spring that is positioned is held, so be driven again simultaneously ball bearing on the plate prop up only need adjust the corner locating piece then before and after feed precision can be adjusted easily and control, being pivoted of emery wheel revolving bed can make the emery wheel angle adjust easily simultaneously, eccentric feeding about whole emery wheel revolving bed is easily carried out with respect to board, adjust during in order to abrasive tip milling cutter or drill bit and grind the angle position, so the easy part configuration of the utility model utilization and can reach need not existing slide rail locate mode commonly used, each desire in the time of but precisely reaching the abrasive tip milling cutter is ground the location of angle.
Below in conjunction with accompanying drawing the utility model is elaborated:
A kind of end mill(ing) cutter, drill grinder, power switch 20 and portable lamp 72 are set on board 10, establish emery wheel revolving bed 80 emery wheel revolving bed set bolts 82 emery wheel revolving beds 80 on it and be provided with drill bit emery wheel 84, end mill(ing) cutter emery wheel 86, use emery wheel revolving bed set bolt 82 to be adjusted the angle of inclination of two emery wheels, and bit location is set on board 10 adjusts seat 62, on it and collocation drill bit holder 66 and bit location adjust handle 68, when abrasive drill 70, displacement up and down easily, adjust and desire abrasive drill 70 and drill bit emery wheel 84 contact-making surface angles, and then grind various spiral bit smoothly, solid center bit, the cement drill bit, subland drill, centre drill, left-handed drill bit, shovel brill etc., especially drill bit holder 66 of the present utility model can grip the drill bit 70 of Any shape, do not need to buy a lot of big and small anchor clamps and change because desiring abrasive drill 70 sizes, the collet chuck that more needn't spend a lot of times to go to seek suitable dimension comes clamping drilling bit 70, they are two years old, 10 are provided with end mill(ing) cutter emery wheel 86 and end mill(ing) cutter high and low position slide block 46 on it and 3 segmentation liftings are set fixedly turn round 40 and lifting fixed bar 42 on the board, set firmly a pneumatic cylinder feed shaft 30 its ends on it and be provided with end mill(ing) cutter chuck 36 in order to bare terminal end milling cutter 89, front end is provided with limb 32 and alignment pin 60 in order to user's abrasive tip milling cutter flat edge, establishes spiral angle and the back rake angle of a spiral-guide adjusting device 48 in order to abrasive tip milling cutter 89 on the board simultaneously.And board 10 ends are provided with a front and back feeding handwheel 50, its connect concealed space inside, 10 belows of board feeding corner axle 92 its connect another place kick 91 again after connecting a place kick 91 and connecting the emery wheel revolving bed projection 81 that runs through the slotted eye 93 on 10 of the boards, its afterbody also is provided with feeding corner axle spring 96, so make the displacement of whole emery wheel revolving bed 80 before and after carrying out with respect to board 10 when giving handwheel 50 before and after the operation time.And because of on the emery wheel revolving bed projection 81 of the slotted eye 93 that runs through 10 of boards and screwed togather corner locating piece 99, and be installed in the retainer spring 90 of board 10 bottoms because of 99 connections one of corner locating piece, but die when operating left and right sides feeding handwheel 88 because of 94 displacements of swivel bearing 97 drive plates, so can make the ball bearing 98 compacting corner locating pieces 99 on the drive plate 94 the end so that corner locating piece 99 offset rotation and allow whole emery wheel revolving bed 80 carry out with respect to board 10 about eccentric feeding, and because of be positioned spring 90 of corner locating piece 99 is held, the ball bearing 98 that is driven again on the plate 94 simultaneously props up, so only need adjust 99 front and back of corner locating piece feed precision can be adjusted and control easily, because of can making the emery wheel angle, being pivoted of emery wheel revolving bed be adjusted easily simultaneously, in order to the user when abrasive tip milling cutter 89 or the drill bit 70, adjust and grind the angle position, so easy part configuration of the utility model utilization and can reach need not existing slide rail locate mode commonly used, each desire in the time of but precisely reaching abrasive tip milling cutter 89 is ground the location of angle, prove to be the good assistant of abrasive tip milling cutter 89 and drill bit in fact, and meet the standard of applying for existing novel patent.

Claims (10)

1. an end mill(ing) cutter, drill grinder, it is characterized in that: a slotted eye is established in board face appropriate position, and the emery wheel revolving bed that a lower edge has projection is set in the slotted eye, and a set bolt and drill bit emery wheel and end mill(ing) cutter emery wheel are set on the emery wheel revolving bed; Another appropriate position is provided with and sets firmly a pneumatic cylinder feed shaft on an end mill(ing) cutter high and low position slide block, the end mill(ing) cutter high and low position slide block and the syllogic lifting is fixedly turned round and handle on the board face, pneumatic cylinder feed shaft end is provided with the end mill(ing) cutter chuck of bare terminal end milling cutter, and its front end is provided with limb; On another relative board face of end mill(ing) cutter high and low position slide block, being provided with one has bit location to adjust handle to adjust seat with clamping and the bit location of adjusting bit location; Appropriate position, board face upper surface be provided with make the emery wheel revolving bed do before and after displacement front and back feeding handwheel, make the emery wheel revolving bed make the left and right sides feeding handwheel and the front and back feeding handwheel of left and right displacement; Board inside also is provided with emery wheel revolving bed projection and is connected with feeding corner axle, feeding corner axle spring, place kick, retainer spring, drive plate, swivel bearing, corner locating piece.
2. a kind of end mill(ing) cutter as claimed in claim 1, drill grinder is characterized in that: described board table top appropriate position is provided with emery wheel revolving bed projection that an emery wheel revolving bed extends and feeding corner axle and corner locating piece and retainer spring and is set firmly the slotted eye that is connected.
3. a kind of end mill(ing) cutter as claimed in claim 1, drill grinder is characterized in that: the feeding corner axle that the end of front and back feeding handwheel connection board inside is provided with feeding corner axle spring makes the front and back displacement in the slotted eye scope of whole emery wheel revolving bed to drive the emery wheel revolving bed projection that connects on it.
4. a kind of end mill(ing) cutter as claimed in claim 1, drill grinder is characterized in that: left and right sides feeding handwheel forces a drive plate when making the swivel bearing forward impelling.
5. a kind of end mill(ing) cutter as claimed in claim 4, drill grinder, it is characterized in that: described drive plate end is pivoted a ball bearing with compacting corner locating piece, and being connected with the retainer spring that is installed in the board bottom on the corner locating piece, left and right sides feeding handwheel is subjected to the draw of spring strength and then makes whole emery wheel revolving bed left and right displacement in the slotted eye scope when making swivel bearing force drive plate forward.
6. a kind of end mill(ing) cutter as claimed in claim 1, drill grinder is characterized in that: the pneumatic cylinder feed shaft that end mill high and low position slide block which is provided with the end mill(ing) cutter front and back displacement on the terminal end mill(ing) cutter chuck of control is established in described board face top.
7. a kind of end mill(ing) cutter as claimed in claim 6, drill grinder is characterized in that: described pneumatic cylinder feed shaft front end is provided with limb and alignment pin.
8. a kind of end mill(ing) cutter as claimed in claim 6, drill grinder is characterized in that: described end mill(ing) cutter high and low position slide block is provided with that lifting is fixedly turned round and the lifting fixed bar, and the pneumatic cylinder feed shaft switching position up and down on it is set.
9. a kind of end mill(ing) cutter as claimed in claim 1, drill grinder is characterized in that: described bit location adjustment seat is provided with the drill bit holder and bit location is adjusted handle, and the drill bit holder can be dismantled.
10. a kind of end mill(ing) cutter as claimed in claim 1, drill grinder is characterized in that: described feeding corner axle spring is pivoted with two place kick that make corner locating piece deviation angle.
CNU200720146568XU 2007-05-10 2007-05-10 End milling cutter bit grinder Expired - Fee Related CN201044945Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNU200720146568XU CN201044945Y (en) 2007-05-10 2007-05-10 End milling cutter bit grinder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNU200720146568XU CN201044945Y (en) 2007-05-10 2007-05-10 End milling cutter bit grinder

Publications (1)

Publication Number Publication Date
CN201044945Y true CN201044945Y (en) 2008-04-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
CNU200720146568XU Expired - Fee Related CN201044945Y (en) 2007-05-10 2007-05-10 End milling cutter bit grinder

Country Status (1)

Country Link
CN (1) CN201044945Y (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102554715A (en) * 2010-12-20 2012-07-11 上海电机学院 Six-axis numerical-control bit edge grinder
CN102794678A (en) * 2012-08-29 2012-11-28 池州市旭豪机械有限公司 Knife grinding device for trimmer of leather bore
CN103029225A (en) * 2011-10-06 2013-04-10 株式会社迪思科 Cutting device
CN103072051A (en) * 2011-10-26 2013-05-01 厚图科技有限公司 Improved drill grinding system
CN104308677A (en) * 2014-11-13 2015-01-28 台州美日机床有限公司 Numerical control drill grinder
CN105517761A (en) * 2013-07-08 2016-04-20 Jpw工业有限公司 Tool rest with angle indicator for use with bench grinder
CN105690189A (en) * 2016-03-14 2016-06-22 广西科技大学鹿山学院 Six-degree of freedom multifunctional milling cutter sharpener
CN105904289A (en) * 2016-05-17 2016-08-31 芜湖洪金机床有限公司 Periphery grinding machine for numerical control blade
CN106363471A (en) * 2016-10-18 2017-02-01 广州汇专工具有限公司 Equipment and method for machining tools
CN109176194A (en) * 2018-09-03 2019-01-11 湖南南方通用航空发动机有限公司 A kind of device on the gap joint surface for reconditioning piston ring

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102554715A (en) * 2010-12-20 2012-07-11 上海电机学院 Six-axis numerical-control bit edge grinder
CN103029225A (en) * 2011-10-06 2013-04-10 株式会社迪思科 Cutting device
CN103029225B (en) * 2011-10-06 2016-04-20 株式会社迪思科 Topping machanism
CN103072051A (en) * 2011-10-26 2013-05-01 厚图科技有限公司 Improved drill grinding system
CN102794678A (en) * 2012-08-29 2012-11-28 池州市旭豪机械有限公司 Knife grinding device for trimmer of leather bore
CN105517761B (en) * 2013-07-08 2018-06-05 Jpw工业有限公司 For the tool rack with angle display being used together with bench grinding machine
CN105517761A (en) * 2013-07-08 2016-04-20 Jpw工业有限公司 Tool rest with angle indicator for use with bench grinder
CN104308677A (en) * 2014-11-13 2015-01-28 台州美日机床有限公司 Numerical control drill grinder
CN105690189A (en) * 2016-03-14 2016-06-22 广西科技大学鹿山学院 Six-degree of freedom multifunctional milling cutter sharpener
CN105904289A (en) * 2016-05-17 2016-08-31 芜湖洪金机床有限公司 Periphery grinding machine for numerical control blade
CN106363471A (en) * 2016-10-18 2017-02-01 广州汇专工具有限公司 Equipment and method for machining tools
CN109176194A (en) * 2018-09-03 2019-01-11 湖南南方通用航空发动机有限公司 A kind of device on the gap joint surface for reconditioning piston ring

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Granted publication date: 20080409

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