CN101704203B - Cutter grinding machine - Google Patents

Cutter grinding machine Download PDF

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Publication number
CN101704203B
CN101704203B CN2009102504859A CN200910250485A CN101704203B CN 101704203 B CN101704203 B CN 101704203B CN 2009102504859 A CN2009102504859 A CN 2009102504859A CN 200910250485 A CN200910250485 A CN 200910250485A CN 101704203 B CN101704203 B CN 101704203B
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CN
China
Prior art keywords
oil cylinder
tooth
supporting
cutter
lifting
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
CN2009102504859A
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Chinese (zh)
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CN101704203A (en
Inventor
胡金定
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.)
Xiamen Kinzo Mechanical & Electrical Co., Ltd.
Original Assignee
XIAMEN JINDIAN HIGH-TECH GRADUATE SCHOOL 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.)
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Application filed by XIAMEN JINDIAN HIGH-TECH GRADUATE SCHOOL Co Ltd filed Critical XIAMEN JINDIAN HIGH-TECH GRADUATE SCHOOL Co Ltd
Priority to CN2009102504859A priority Critical patent/CN101704203B/en
Publication of CN101704203A publication Critical patent/CN101704203A/en
Application granted granted Critical
Publication of CN101704203B publication Critical patent/CN101704203B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The invention relates to a cutter grinding machine, in particular to a grinding device. The invention provides the cutter grinding machine which has the advantages of strong practicability, more functions, simple structure and convenient maintenance. A manual coarse adjustment lifting device is provided with a hand wheel, a screw shaft, a supporting seat and a supporting guide block. An XY axel manual coarse adjustment mechanism is provided with an upper dovetail slide block, a middle dovetail slide block, a lower dovetail slide block, a coarse adjustment hand wheel, an adjustment screw mandrel, an adjustment screw mandrel supporting rack and a breakwater. A pressure tooth mechanism is provided with a saw bit substrate supporting cylinder, a supporting rotation shaft, a pressure tooth oil cylinder curved supporting rack, a pressure tooth oil cylinder supporting arm and a pressure tooth oil cylinder. A tooth pulling mechanism is provided with a saw bit slide table, a tooth pulling oil cylinder, a tooth pulling trunnion, a tooth pulling arm, a saw bit supporting disk and a pulling fork. An XZ axel feeding mechanism is provided with a Z axel feeding oil cylinder, an upper slide plate, a middle slide plate, a lower slide plate, an X axel feeding oil cylinder, a curved plate, an X axel feeding fine adjustment hand wheel and an adjustment nut. An automatic rocker rotation angle mechanism is provided with a rocker adjustment oil cylinder, a smooth tooth oil cylinder adjustment hand wheel, a rotation shaft bracket, an oscillating mandrel and a cutter bracket. A grinding mechanism is provided with an electromotor, a ribbed protecting cap and a grinding wheel grinding head.

Description

A kind of cutter finishing machine
Technical field
The present invention relates to a kind of milling apparatus, especially relate to a kind of cutter finishing machine.
Background technology
Tool lapping equipment is a kind of application conventional process tools very widely, mainly is made up of bistrique, motor and transmission mechanism etc.
Each plane that the last crux manufacturing procedure of precision cutting tool is the sharpening cutter is in the hope of geometry, dimensional accuracy and the surface quality that obtains to require.Must make emery wheel and Work piece high-speed finish a series of motions exactly for this reason, and as the material of precision cutting tool to the hardness alloy development, be the KCR06 carbide alloy, hardness reaches HCR93.8, and stretch bending strength is not less than 2300MPa, and is more and more higher to the grinding requirement of many formulas cutter all angles, become increasingly complex, variation is many, and process of lapping quite bothered in the past, mostly carries out hand-ground, efficient is low, speed is slow, and the workman is not easy to operate, has seriously restricted the development of cutter.
Chinese patent CN2191743 provides a kind of improved min-cutter lapping device, is applicable to that the micromachine cutter for same carries out online repairing, work such as sharpening again.This device is made up of metal bistrique, drive motors, electric machine support, motor base etc., and main feature is to be stained with sand paper on the metal bistrique outer wall, can replace varigrained sand paper easily; Have and do not have axle bistrique inclining rotary mechanism, the electric machine support convex surface of this device forms with the motor groove and cooperates cylindrical cambered surface, realizes self-stabilization, need not mechanical support.This device has that equipment is simple, volume is little, can be convenient for changing varigrained sand paper, realizes the grinding of refinement step by step to cutter, and mirror grinding.
Chinese patent CN2827625 discloses a kind of adjustable and carries cutter finishing machine, this grinder comprises a casing, be provided with one in the casing and drive the stable self-powered source that rotates of an emery wheel, and be provided with in body and cooperate the positioner of a tool with clamping one cutter to be ground, first grinds seat and second grinds seat, the described first grinding seat and second grinds each cooperation of seat and is provided with an adjusting device, this adjusting device has a guide rail and a slide, wherein, guide rail is fixed on the described grinder, and guide rail is relative with slide to be provided with sliding embedding structure, first and second grinds seat respectively has single shaft or the above displacement of twin shaft to adjust operation, so that the grinding of cutting edge and chip area has more the elasticity of grinding allowance, reach and carry out precise finiss and adjustable purpose.
Summary of the invention
The object of the present invention is to provide that a kind of practicality is strong, function cutter finishing machine more, simple to operate, easy to maintenance.
The present invention is provided with frame, manual coarse adjustment lifting device, X Z axle manual coarse adjustment mechanism, presses gear mechanism, pulls out gear mechanism, XZ axle feed mechanism, yaw anglec of rotation mechanism and grinding mechanism automatically.
Manual coarse adjustment lifting device is provided with lift adjustment handwheel, lifting screw, lifting supporting base and lifting supporting guide pad.The lift adjustment handwheel is located at the frame rear, the lift adjustment handwheel is connected with lifting screw, the lift adjustment handwheel is connected by lifting screw and lifting supporting base and lifting supporting guide pad, drives lifting by lifting screw and lifting supporting base during turn lift adjustment handwheel and supports guide pad and move up and down and reach the adjustable height requirement.
XZ axle manual coarse adjustment mechanism is provided with dovetail slide block, middle dovetail slide block, following dovetail slide block, coarse adjustment handwheel, regulates screw mandrel, regulates screw mandrel bearing support and water fender.Last dovetail slide block, middle dovetail slide block, following dovetail slide block are installed on the lifting supporting guide pad, and lifting supporting guide pad is in transmission connection with regulating screw mandrel bearing support, adjusting screw mandrel and adjusting handle, and water fender is installed on the dovetail slide block.
Press gear mechanism to be provided with saw blade base support tube, supporting shaft, the curved bearing support of pressure tooth oil cylinder, pressure tooth oil cylinder supporting arm and pressure tooth oil cylinder.Saw blade base support tube is located at the water fender top, supporting shaft is located at saw blade base support tube top, is pressed the curved bearing support of tooth oil cylinder to be fixed on the supporting shaft, press tooth oil cylinder supporting arm to be installed in and press on the curved bearing support of tooth oil cylinder, press the tooth oil cylinder to be located at and press in the tooth oil cylinder supporting arm.Pressing compressing of gear mechanism is by pressing the tooth oil cylinder to realize.
Pulling out gear mechanism is provided with the saw blade slide unit, pulls out the tooth oil cylinder, pulls out tooth and prop up hinge, pull out tooth arm, saw blade supporting disk and fork, the saw blade slide unit is located on the supporting shaft of pressing gear mechanism, pull out the tooth oil cylinder, pull out that tooth props up hinge and the saw blade supporting disk all is located on the saw blade slide unit, pull out the tooth arm and be located at and pull out tooth and prop up on the hinge.
XZ axle feed mechanism is provided with Z axle feed cylinder, upper slide, middle lower skateboard, X-axis feed cylinder, curved plates, X-axis feeding trimming hand wheel and adjusting nut.X Z axle feed mechanism is installed in the frame upper right side, upper slide and middle lower skateboard are located on the frame, Z axle feed cylinder is fixed on the frame and is connected with upper slide by the cylinder axle and promotes to realize left and right sides feeding, curved plates and middle lower skateboard edge joint, X-axis feeding trimming hand wheel is connected on the curved plates, and the X-axis feed cylinder is fixed on the frame and drives X-axis feeding trimming hand wheel by the slip axis of cone realizes the front and back feeding.
Automatically yaw anglec of rotation mechanism is provided with yaw and regulates oil cylinder, flat tooth oil cylinder adjusting handle, rotary shaft rack, swing mandrel and cutter electric machine support.Yaw is regulated oil cylinder and is located at the rotary shaft rack right side, and flat tooth oil cylinder adjusting handle is located at yaw and regulates in the oil cylinder, and rotary shaft rack is located on the upper slide, and the swing mandrel is inserted in rotary shaft rack to be fixed, and the cutter electric machine support is located at the rotary shaft rack top and is connected with the swing mandrel.
Grinding mechanism is provided with grinding head motor, polywedge bet guard shield and emery wheel bistrique.Grinding head motor is located at cutter electric machine support top, and the emery wheel bistrique is located at the left side of cutter electric machine support, and the polywedge bet guard shield is located at cutter electric machine support rear.
Press gear mechanism preferably to be provided with rotation scale indicating dial, rotation scale indicating dial is inserted in and is fixedly arranged on the saw blade carrying cylinder.
The saw blade supporting disk is preferably the disc slide unit.
Preferably be provided with damping iron pad in the frame bottom corner, the vibrations that bring to board when grinding to reduce are to the influence of saw blade machining accuracy.Preferably be provided with 4 suspension ring holes around above frame, be convenient to carrying.Be provided with main electric cabinet in the frame left side, above the frame right side, be provided with man machine operation interface, so that control board better, personnel operation easy to use.
Preferably be provided with dustproof tightening cover at the frame rear, on dustproof tightening cover, preferably be provided with the lifting locking nut.
In lifting screw, preferably be provided with rotation scale indicating dial.
Compare with existing tool lapping equipment, the present invention has following outstanding advantage and technique effect:
1) milling cutter generally divides three process promptly to grind two side faces earlier, grinds the front again, grinds the back at last, and the three process grinder has nothing in common with each other.And polish process of the present invention both can have been ground the front, can grind the back again, accomplished a tractor serves several purposes.
2) existing grinder is adjusted trouble, during as five tooth dissimilar tooth form repeated arrangement when grinding the back dissimilar tooth form; often jump tooth successively with after a kind of profile of tooth; shut down to adjust second kind of profile of tooth behind the lathe again, till five kinds of profiles of tooth had all been ground, production efficiency was lower.The present invention then can reach 14 kinds by the profile of tooth that tooth is set earlier by disposable automatic grinding, has multi-functional and the higher characteristics of automaticity.
3) contrast of the technical performance of the present invention and like product both domestic and external is referring to table 1.
Table 1
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention.
Fig. 2 is the side-looking structural representation of the embodiment of the invention.
The specific embodiment
Following examples will the present invention is further illustrated in conjunction with the accompanying drawings.
Referring to Fig. 1 and 2, the embodiment of the invention 1 is provided with frame 1, manual coarse adjustment lifting device, X Z axle manual coarse adjustment mechanism, presses gear mechanism, pulls out gear mechanism, X Z axle feed mechanism, yaw anglec of rotation mechanism and grinding mechanism automatically.
Manual coarse adjustment lifting device is provided with lift adjustment handwheel 40, lifting screw axle 42, lifting supporting base 5 and lifting supporting guide pad 6.Lift adjustment handwheel 40 is located at frame 1 rear, lift adjustment handwheel 40 is connected with lifting screw 42, lift adjustment handwheel 40 is connected with lifting supporting guide pad 6 with lifting supporting base 5 by lifting screw 42, supports guide pads 6 by lifting screw 42 and the 5 drive liftings of lifting supporting base during turn lift adjustment handwheel 40 and moves up and down and reach the adjustable height requirement.
XZ axle manual coarse adjustment mechanism is provided with dovetail slide block 36, middle dovetail slide block 37, following dovetail slide block 38, coarse adjustment handwheel 44, regulates screw mandrel 45, regulates screw mandrel bearing support 46 and water fender 8.Last dovetail slide block 36, middle dovetail slide block 37, following dovetail slide block 38 are installed on the lifting supporting guide pad 6, lifting is supported guide pad 6 and is regulated the adjusting all around that screw mandrel bearing support 46, adjusting screw mandrel 45 and adjusting handle 44 are in transmission connection and realize X Z axle, water fender 8 is installed on the dovetail slide block 36, blocks cooling water and flows in X Z axle manual coarse adjustment mechanism and the manual coarse adjustment lifting device to play.
Press gear mechanism to be provided with saw blade base support tube 9, rotation scale indicating dial 11, supporting shaft 12, to press the curved bearing support 16 of tooth oil cylinder, press tooth oil cylinder supporting arm 18 and press tooth oil cylinder 20.Saw blade base support tube 9 is located at water fender 8 tops, rotation scale indicating dial 11 is fixedly arranged on and is inserted in saw blade carrying cylinder 9, supporting shaft 12 is located at saw blade base support tube 9 tops, is pressed the curved bearing support 16 of tooth oil cylinder to be fixed on the supporting shaft 12, press tooth oil cylinder supporting arm 18 to be installed in and press on the curved bearing support 16 of tooth oil cylinder, press tooth oil cylinder 20 to be located at and press in the tooth oil cylinder supporting arm 18.Pressing compressing of gear mechanism is by pressing tooth oil cylinder 20 to realize.
Pulling out gear mechanism is provided with saw blade slide unit 10, pulls out tooth oil cylinder 7, pulls out tooth and prop up hinge 13, pull out tooth arm 14, saw blade supporting disk 15 and fork 17, saw blade slide unit 10 is located on the supporting shaft 12 of pressing gear mechanism, pull out tooth oil cylinder 7, pull out tooth prop up the hinge 13 and saw blade supporting disk 15 all be located on the saw blade slide unit 10, pull out tooth arm 14 be located at pull out tooth prop up the hinge 13 on, saw blade supporting disk 15 is by the slip on saw blade slide unit 10 and change the saw blade that center is applicable to different-diameter and aperture, and saw blade supporting disk 15 is preferably the disc slide unit.
X Z axle feed mechanism is provided with Z axle feed cylinder 29, upper slide 30, middle lower skateboard 31, X-axis feed cylinder 32, curved plates 33, X-axis feeding trimming hand wheel 34 and adjusting nut 35.X Z axle feed mechanism is installed in frame 1 upper right side, upper slide 30 and middle lower skateboard 31 are located on the frame 1, Z axle feed cylinder 29 is fixed on the frame 1 and is connected with upper slide 30 by the cylinder axle and promotes to realize left and right sides feeding, curved plates 33 and middle lower skateboard 31 edge joints, X-axis feeding trimming hand wheel 34 is connected on the curved plates 33, and X-axis feed cylinder 32 is fixed on the frame 1 and drives X-axis feeding trimming hand wheel 34 by the slip axis of cone realizes the front and back feeding.
Automatically yaw anglec of rotation mechanism is provided with yaw and regulates oil cylinder 24, flat tooth oil cylinder adjusting handle 27, rotary shaft rack 28, swing mandrel 26 and cutter electric machine support 21.Yaw is regulated oil cylinder 24 and is located at rotary shaft rack 28 right hand hay cutters, flat tooth oil cylinder adjusting handle 27 is located at yaw and regulates in the oil cylinder 24, rotary shaft rack 28 is located on the upper slide 30, and it is fixing that swing mandrel 26 is inserted in rotary shaft rack 28, and cutter electric machine support 21 is located at rotary shaft rack 28 tops and is connected with swing mandrel 26.
Grinding mechanism is provided with grinding head motor 23, polywedge bet guard shield 22 and emery wheel bistrique 19.Grinding head motor 23 is located at cutter electric machine support 21 tops, and emery wheel bistrique 19 is located at the left side of cutter electric machine support 21, and polywedge bet guard shield 22 is located at cutter electric machine support 21 rears.
Be provided with damping iron pad 2 for 4 jiaos in frame 1 bottom, the vibrations that bring to board when grinding to reduce are to the influence of saw blade machining accuracy.Be provided with 4 suspension ring holes 4 around above frame 1, be convenient to carrying.Be provided with main electric cabinet 3 in frame 1 left side, top, frame 1 right side is provided with man machine operation interface 25, so that control board better, personnel operation easy to use.
Be provided with dustproof tightening cover 43 at frame 1 rear, on dustproof tightening cover 43, be provided with lifting locking nut 39.
In lifting screw 42, be provided with rotation scale indicating dial 41.

Claims (8)

1. cutter finishing machine is characterized in that being provided with frame, manual coarse adjustment lifting device, XZ axle manual coarse adjustment mechanism, presses gear mechanism, pulls out gear mechanism, XZ axle feed mechanism, yaw anglec of rotation mechanism and grinding mechanism automatically;
Manual coarse adjustment lifting device is provided with lift adjustment handwheel, lifting screw, lifting supporting base and lifting supporting guide pad; The lift adjustment handwheel is located at the frame rear, and the lift adjustment handwheel is connected with lifting screw, and the lift adjustment handwheel is connected with lifting supporting guide pad with the lifting supporting base by lifting screw;
XZ axle manual coarse adjustment mechanism is provided with dovetail slide block, middle dovetail slide block, following dovetail slide block, coarse adjustment handwheel, regulates screw mandrel, regulates screw mandrel bearing support and water fender; Last dovetail slide block, middle dovetail slide block, following dovetail slide block are installed on the lifting supporting guide pad, and lifting supporting guide pad is in transmission connection with regulating screw mandrel bearing support, adjusting screw mandrel and adjusting handle, and water fender is installed on the dovetail slide block;
Press gear mechanism to be provided with saw blade base support tube, supporting shaft, the curved bearing support of pressure tooth oil cylinder, pressure tooth oil cylinder supporting arm and pressure tooth oil cylinder; Saw blade base support tube is located at the water fender top, supporting shaft is located at saw blade base support tube top, press the curved bearing support of tooth oil cylinder to be fixed on the supporting shaft, press tooth oil cylinder supporting arm to be installed in and press on the curved bearing support of tooth oil cylinder, press the tooth oil cylinder to be located at and press in the tooth oil cylinder supporting arm;
Pulling out gear mechanism is provided with the saw blade slide unit, pulls out the tooth oil cylinder, pulls out tooth and prop up hinge, pull out tooth arm, saw blade supporting disk and fork, the saw blade slide unit is located on the supporting shaft of pressing gear mechanism, pull out the tooth oil cylinder, pull out that tooth props up hinge and the saw blade supporting disk all is located on the saw blade slide unit, pull out the tooth arm and be located at and pull out tooth and prop up on the hinge;
XZ axle feed mechanism is provided with Z axle feed cylinder, upper slide, middle lower skateboard, X-axis feed cylinder, curved plates, X-axis feeding trimming hand wheel and adjusting nut; XZ axle feed mechanism is installed in the frame upper right side, upper slide and middle lower skateboard are located on the frame, Z axle feed cylinder is fixed on the frame and by the cylinder axle and is connected with upper slide, the cylinder axle promotes upper slide and realizes upper slide left and right sides feeding, curved plates is connected with middle downslide edges of boards, X-axis feeding trimming hand wheel is connected on the curved plates, and the X-axis feed cylinder is fixed on the frame and drives X-axis feeding trimming hand wheel by the slip axis of cone realizes the front and back feeding;
Automatically yaw anglec of rotation mechanism is provided with yaw and regulates oil cylinder, flat tooth oil cylinder adjusting handle, rotary shaft rack, swing mandrel and cutter electric machine support; Yaw is regulated oil cylinder and is located at the rotary shaft rack right side, and flat tooth oil cylinder adjusting handle is located at yaw and regulates in the oil cylinder, and rotary shaft rack is located on the upper slide, and the swing mandrel is inserted in rotary shaft rack to be fixed, and the cutter electric machine support is located at the rotary shaft rack top and is connected with the swing mandrel;
Grinding mechanism is provided with grinding head motor, polywedge bet guard shield and emery wheel bistrique, and grinding head motor is located at cutter electric machine support top, and the emery wheel bistrique is located at the left side of cutter electric machine support, and the polywedge bet guard shield is located at cutter electric machine support rear.
2. a kind of cutter finishing machine as claimed in claim 1 is characterized in that pressing gear mechanism to be provided with rotation scale indicating dial, and rotation scale indicating dial is inserted in and is fixedly arranged on the saw blade carrying cylinder.
3. a kind of cutter finishing machine as claimed in claim 1 is characterized in that the saw blade supporting disk is the disc slide unit.
4. a kind of cutter finishing machine as claimed in claim 1 is characterized in that being provided with damping iron pad in the frame bottom corner.
5. a kind of cutter finishing machine as claimed in claim 1 is characterized in that being provided with 4 suspension ring holes all around above frame.
6. a kind of cutter finishing machine as claimed in claim 1 is characterized in that being provided with main electric cabinet in the frame left side, is provided with man machine operation interface above the frame right side.
7. a kind of cutter finishing machine as claimed in claim 1 is characterized in that being provided with dustproof tightening cover at the frame rear, is provided with the lifting locking nut on dustproof tightening cover.
8. a kind of cutter finishing machine as claimed in claim 1 is characterized in that being provided with rotation scale indicating dial in lifting screw.
CN2009102504859A 2009-12-10 2009-12-10 Cutter grinding machine Expired - Fee Related CN101704203B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2009102504859A CN101704203B (en) 2009-12-10 2009-12-10 Cutter grinding machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2009102504859A CN101704203B (en) 2009-12-10 2009-12-10 Cutter grinding machine

Publications (2)

Publication Number Publication Date
CN101704203A CN101704203A (en) 2010-05-12
CN101704203B true CN101704203B (en) 2011-07-20

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Application Number Title Priority Date Filing Date
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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104384608A (en) * 2014-10-15 2015-03-04 张家港市南丰程泰机械工具厂 Saw blade grinding machine
CN106903560B (en) * 2017-02-27 2018-10-30 南通大学 Micro- pendulum grinding and polishing device of Machining Arc blade diamond tool nose circular arc
CN110919481B (en) * 2019-12-17 2020-11-17 安徽鼎恒实业集团有限公司 High-precision grinding equipment suitable for remanufacturing of automobile engine crankshaft

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3953616A (en) * 1969-03-06 1976-04-27 Pfizer Inc. Organic acid derivatives
DE4121155A1 (en) * 1991-06-26 1993-01-14 Georg Rawus Low-cost machine for semi-automatic sharpening of circular saw blades - has hand actuated linkage providing infeed movement of grinding wheel and phased tooth to tooth indexing
CN201205622Y (en) * 2008-04-30 2009-03-11 锋和机械工业股份有限公司 Grinding and locating structure for circular saw blade

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3953616A (en) * 1969-03-06 1976-04-27 Pfizer Inc. Organic acid derivatives
DE4121155A1 (en) * 1991-06-26 1993-01-14 Georg Rawus Low-cost machine for semi-automatic sharpening of circular saw blades - has hand actuated linkage providing infeed movement of grinding wheel and phased tooth to tooth indexing
CN201205622Y (en) * 2008-04-30 2009-03-11 锋和机械工业股份有限公司 Grinding and locating structure for circular saw blade

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Owner name: XIAMEN KINZO MECHANICAL + ELECTRICAL CO., LTD.

Free format text: FORMER OWNER: XIAMEN JINDIAN HIGH-TECH. GRADUATE SCHOOL CO., LTD.

Effective date: 20140529

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Address after: 361022 No. 6 West Dong Road, Jimei District, Fujian, Xiamen

Patentee after: Xiamen Kinzo Mechanical & Electrical Co., Ltd.

Address before: Jimei District of Xiamen City, Fujian province 361022 Dong Ren jinzang Road No. 6 Building Science and Technology Industrial Park

Patentee before: Xiamen Jindian High-Tech. Graduate School Co., Ltd.

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Granted publication date: 20110720

Termination date: 20151210