CN107520756A - Double fulcrum single armed deep camber hydraulic pressure dressers - Google Patents
Double fulcrum single armed deep camber hydraulic pressure dressers Download PDFInfo
- Publication number
- CN107520756A CN107520756A CN201610699532.8A CN201610699532A CN107520756A CN 107520756 A CN107520756 A CN 107520756A CN 201610699532 A CN201610699532 A CN 201610699532A CN 107520756 A CN107520756 A CN 107520756A
- Authority
- CN
- China
- Prior art keywords
- axle
- endoporus
- swing arm
- fixed
- screw
- 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.)
- Granted
Links
- 229910003460 diamond Inorganic materials 0.000 claims abstract description 18
- 239000010432 diamond Substances 0.000 claims abstract description 18
- 210000004907 gland Anatomy 0.000 claims description 29
- 238000007789 sealing Methods 0.000 claims description 9
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 3
- QGMRQYFBGABWDR-UHFFFAOYSA-M Pentobarbital sodium Chemical compound [Na+].CCCC(C)C1(CC)C(=O)NC(=O)[N-]C1=O QGMRQYFBGABWDR-UHFFFAOYSA-M 0.000 claims 1
- 229910001651 emery Inorganic materials 0.000 abstract description 19
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 230000003746 surface roughness Effects 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 16
- 238000005516 engineering process Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
Classifications
-
- 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
- B24B53/00—Devices or means for dressing or conditioning abrasive surfaces
- B24B53/12—Dressing tools; Holders therefor
- B24B53/14—Dressing tools equipped with rotary rollers or cutters; Holders therefor
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
A kind of double fulcrum single armed deep camber hydraulic pressure dressers, the automatic dressing for emery wheel.Axle one and axle two are respectively provided with the upper and lower endoporus of swing arm and fixed arm, swing arm links together with axle one and axle two, at upper and lower the two of fixed arm matched bearings one and matched bearings two are respectively provided with endoporus, rotary oil cylinder drives swing arm to install the endoporus of matched bearings one and matched bearings two as the swing of fulcrum reciprocating rotary, and crushing is circular shape by the nib of the diamond pen on swing arm.The present invention is not limited by lathe space, fixed arm and Buddha's warrior attendant penholder are easy to adjust, the quick finishing and grinding for realizing cylindrical grinder deep camber emery wheel, grinding carriage F.F. can realize form grinding, grinding carriage, which retreats, can be achieved crushing, and the emery wheel the curvature center before and after repairing is constant, and the conversion speed of finishing and grinding is very fast, operating efficiency can be effectively improved, the surface roughness of the wheel grinding workpiece after finishing can reach standard requirement.
Description
Technical field
The present invention relates to machinery manufacturing technology field, is specifically that one kind is used for cylindrical grinder or universal grinding machine external, is ground
The deep camber circular arc hydraulic pressure dresser of shaping workpiece.
Background technology
The trimmer of existing cylindrical grinder is broadly divided into mechanical, mechanical hydraulic-pressure type and digital control type by structure, by installation side
Formula is divided into machine tool guideway formula and emery wheel posture.Mechanical and mechanical hydraulic-pressure type mainly includes the dresser of some small arc-shapeds,
Because being limited by lathe space, the arc radius of trimmer is smaller, to the workpiece that Machining Arc radius of curvature is larger, then without
Method is installed and used.And the finishing radius of digital control type trimmer is not limited by lathe, but due to the interpolation of digital control system, cause to repair
The surface roughness of wheel grinding workpiece after whole does not reach standard requirement.
The content of the invention
For overcome the deficiencies in the prior art, goal of the invention of the invention is to provide a kind of double fulcrum single armed deep camber hydraulic pressure
Dresser, to realize the purpose crushing as deep camber circular arc.
For achieving the above object, the present invention includes grinding machine, rotary oil cylinder and control section；Swing arm and fixed arm
Axle one and axle two are respectively provided with upper and lower endoporus, swing arm links together with axle one and axle two, fixed arm upper and lower two at
It is respectively provided with matched bearings one and matched bearings two in endoporus, rotary oil cylinder drives swing arm to install matched bearings one and in pairs
The endoporus of bearing two is that fulcrum reciprocating rotary is swung, and crushing is circular shape by the nib of the diamond pen on swing arm.
The bottom surface of the fixed arm is arranged on by flat key one in the top planes of T-shaped supporting plate, and adjustment plate passes through spiral shell
Nail one is arranged on the side of T-shaped supporting plate, and adjustment axle one is axially fixed in the endoporus of adjustment plate by pressing plate, before adjusting axle one
Portion is threadably mounted in the screwed hole of fixed arm；Rotation adjustment axle one, can be such that fixed arm is moved to right in the guiding bottom left of flat key one
It is dynamic；
Matched bearings one, bearing gland one and bearing gland two are installed by the outer of matched bearings one in the top endoporus of fixed arm
Axial restraint is enclosed, the top of bearing gland two is provided with end cap one；Matched bearings two, bearing pressure are housed in the bottom endoporus of fixed arm
The outer ring axial restraint of matched bearings two, the bottom of bearing gland four are provided with end cap two by lid three and bearing gland four；Swing arm
Axle one and axle two are installed with the upper and lower endoporus of fixed arm, are fixed on into respectively by locking nut one and locking nut two
To in the endoporus of bearing one and matched bearings two, axle one and axle two are connected as one by screw two and screw three with swing arm respectively
Body；The top of axle one and the output shaft of rotary oil cylinder are connected as one by flat key two and shaft coupling, and rotary oil cylinder passes through double end
Stud, nut, screw four connect together with oil cylinder installing plate, fixed arm；
Sealing one and sealing two are installed between axle one and bearing gland one, bearing gland two, installed between axle two and bearing gland three
There is sealing three.
Buddha's warrior attendant penholder is installed in the endoporus of the swing arm middle part, diamond pen is fixed on Buddha's warrior attendant by holding screw
In the anterior endoporus of penholder；Keyway is milled with the face of cylinder of Buddha's warrior attendant penholder, can be on a swing arm under the guiding of screw five or so
Slide, screw five can fix relative position of the Buddha's warrior attendant penholder in swing arm, be equipped with Buddha's warrior attendant penholder for fine adjustment diamond penholder
Adjustment ring and screw six, diamond pen to axle one and the line of centres value of axle two is set to meet the requirement of crushing curvature.
The lathe bed side of the grinding machine is provided with base by screw seven and pin, and T-shaped supporting plate is housed above base,
Linked together between base and T-shaped supporting plate by flat key three and screw eight, flat key three is fixed in the keyway of base, T-shaped
Fixed block is housed, the left surface of base is fixed with adjustment riser, adjusted equipped with adjustment riser and cover plate, cover plate above supporting plate
The centre of riser and cover plate is equipped with adjustment axle two, and the front threads of adjustment axle two are in the screwed hole of fixed block；Rotation adjustment
Axle two can make T-shaped supporting plate be horizontally slipped under the guiding of flat key three on base.
Compared with prior art, the finishing of emery wheel make use of the feed mechanism and liquid of grinding machine in itself to the present invention to greatest extent
Pressure system, swing arm is installed in the endoporus of fixed arm base, matched bearings, paired axle are installed between fixed arm and swing arm
Holding and be glanded with mode connects for screw together, rotary oil cylinder drives swing arm reciprocating rotary in the brearing bore of fixed arm to swing,
On swing arm the nib of diamond pen can by crushing for deep camber circular shape is convex, cup-type grinding wheel.The present invention is not empty by lathe
Between limit, fixed arm and Buddha's warrior attendant penholder are easy to adjust, fast realize the finishing and grinding of cylindrical grinder deep camber emery wheel, emery wheel
Frame F.F. can realize form grinding, and grinding carriage, which retreats, can be achieved crushing, and the emery wheel the curvature center before and after repairing is constant,
The conversion speed of finishing and grinding is very fast, can effectively improve operating efficiency, the rough surface of the wheel grinding workpiece after finishing
Degree can reach standard requirement.
Brief description of the drawings
Fig. 1 is the structure diagram of the present invention.
Fig. 2 is Fig. 1 A-A sectional views.
Fig. 3 is Fig. 2 I enlarged drawings.
Fig. 4 is Fig. 2 II enlarged drawings.
Embodiment
As shown in Figure 1, Figure 2, Figure 3, Figure 4, the bottom surface of fixed arm 17 of the present invention is arranged on T-shaped support by flat key 1
In the top planes of plate 9, adjustment plate 49 is arranged on the side of T-shaped supporting plate 9 by screw 1, and adjustment axle 1 is by pressing plate 44
It is axially fixed in by screw 9 47 in the endoporus of adjustment plate 49, the front threads of adjustment axle 1 are arranged on the spiral shell of fixed arm 17
In pit；Rotation adjustment axle 1, can be such that fixed arm 17 is moved left and right under the guiding of flat key 1.The top of fixed arm 17
Matched bearings 1, bearing gland 1 and bearing gland 2 35 are installed the outer ring of matched bearings 1 is axially solid in endoporus
It is fixed, axially and radially gap can be eliminated, the top of bearing gland 2 35 is provided with end cap 1, bearing gland 1 and bearing gland
2 35 are attached at one piece by screw 10, screw 11 and screw 12 and fixed arm 17 respectively；Under fixed arm 17
Matched bearings 2 54, bearing gland 3 53 and bearing gland 4 56 are housed the outer ring of matched bearings 2 54 is axially solid in portion's endoporus
It is fixed, axially and radially gap can be eliminated, the bottom of bearing gland 4 56 is provided with end cap 2 57, and end cap 2 57 passes through screw 13
It is fixed on bearing gland 4 56；Axle 1 and axle 2 40 are installed, respectively in the upper and lower endoporus of swing arm 16 and fixed arm 17
It is fixed on by locking nut 1 and locking nut 2 55 in the endoporus of matched bearings 1 and matched bearings 2 54, axle 1
Connected as one respectively by screw 2 39 and screw 3 59 with swing arm 16 with axle 2 40；The top of axle 1 and rotary oil cylinder
20 output shaft is connected as one by flat key 2 30 and shaft coupling 32, and rotary oil cylinder 20 passes through studs 18, nut 19, spiral shell
Follow closely 4 31 to connect together with oil cylinder installing plate 29, fixed arm 17, the control section of rotary oil cylinder 20 also includes corresponding electromagnetism
Switch valve and corresponding oil connection etc., the hydraulic system of rotary oil cylinder 20 borrow the hydraulic system of grinding machine, are not required to configure in addition.
Sealing 1 and sealing 2 28, axle 2 40 and bearing gland are installed between axle 1 and bearing gland 1, bearing gland 2 35
Sealing 3 58 is installed between 3 53.
Buddha's warrior attendant penholder 10 is installed, diamond pen 14 is fixed on by holding screw 15 in the endoporus of the middle part of swing arm 16
In the anterior endoporus of Buddha's warrior attendant penholder 10；Keyway is milled with the face of cylinder of Buddha's warrior attendant penholder 10, can be in the screwing 5 13 of swing arm 16
Guiding under horizontally slip, screw 5 13 can fix relative position of the Buddha's warrior attendant penholder 10 in swing arm 16, be filled on Buddha's warrior attendant penholder 10
There are the adjustment ring 11 and screw 6 12 for fine adjustment diamond penholder 10, ensure diamond pen 14 to axle 1 and the line of centres of axle 2 40
H values meet the requirement of crushing curvature.
Base 2 is arranged on the lathe bed side of grinding machine by screw 71 and pin 51, and T-shaped supporting plate is housed above base 2
9, linked together between base 2 and T-shaped supporting plate 9 by flat key 3 23 and screw 88, flat key 3 23 passes through screw 14
It is fixed in the keyway of base 2, fixed block 21 is housed above T-shaped supporting plate 9, the left surface of base 2 is equipped with adjustment riser
6 and cover plate 4, the centre for adjusting riser 6 and cover plate 4 is solid by screw 15 and adjustment riser 6 equipped with adjustment axle 25, cover plate 4
Fixed, the front threads of adjustment axle 25 are in the screwed hole of fixed block 21；Rotation adjustment axle 25 can make T-shaped supporting plate 9 flat
Horizontally slipped under the guiding of key 3 23 on base 2, after T-shaped supporting plate 9 is slided in adjustment, screw 16 can be used to fix.
The rotary oil cylinder 20 of the present invention drives swing arm 16 to install the endoporus of matched bearings 1 and matched bearings 2 54
Swung for fulcrum reciprocating rotary, crushing is circular shape by the nib of the diamond pen 14 on swing arm 16, can repair emery wheel
The whole convex emery wheel for deep camber, also can be by the cup-type grinding wheel that crushing is deep camber, and the nib of diamond pen 14 is in fixed arm 17
The relative position of mandrel, determine that the emery wheel of finishing out is convex or recessed.
The sequence of movement of the present invention：
1st, the radius of curvature H values of finishing emery wheel are adjusted, after the actual curvature radius measurement with the wheel grinding workpiece after finishing
H values are finely tuned again；
2nd, after the size for considering workpiece, the grinding carriage of grinding machine is backed to suitable position, rotation adjustment axle 46, adjusted
The pivot of trimmer swing arm 16 (being the emery wheel center of curvature) tightens screw 17 with respect to the position of emery wheel；
3rd, rotation adjustment axle 25, adjusting the center of trimmer fixed arm 17, (grinding carriage is given up the throne after with respect to the position at emery wheel center
Configuration state) so that the nib of diamond pen 14 can be trimmed to the outermost of emery wheel, and also to be reserved more than the finishing of emery wheel
Amount；Tighten screw 88；
4th, after being adjusted in place more than, the electromagnetic valve switch of rotary oil cylinder 20, the logical hydraulic oil in the inside of rotary oil cylinder 20, rotation oil are opened
The output shaft of cylinder 20 drives shaft coupling 32, axle 1 and swing arm 16, in the support of matched bearings 2 54 and matched bearings 1
Under, reciprocally swinging rotation, swing arm 16 drives Buddha's warrior attendant penholder 10 and the rotation of the anterior reciprocally swinging of diamond pen 14, using grinding machine certainly
The feed mechanism of body grinding carriage, the reciprocally swinging of swing arm 16 rotate once, and grinding carriage backs up a little further distance, so repeatedly just sand
Wheel is trimmed to deep camber；
5th, the emery wheel being trimmed to after deep camber, with the quick F.F. of grinding carriage, the feeding machine of grinding machine itself grinding carriage is utilized
Workpiece is ground to corresponding deep camber by structure, emery wheel, measures the deep camber of workpiece, factually the measured value on border, fine setting H values to satisfaction
The drawing requirement of workpiece.
Claims (4)
- A kind of 1. double fulcrum single armed deep camber hydraulic pressure dressers, it is characterised in that：The dresser includes grinding machine, rotation Oil cylinder（20）And control section；Swing arm（16）And fixed arm（17）Upper and lower endoporus in be respectively provided with axle one（38）With axle two （40）, swing arm（16）With axle one（38）With axle two（40）Link together, fixed arm（17）Upper and lower two in endoporus respectively Equipped with matched bearings one（36）With matched bearings two（54）, rotary oil cylinder（20）Drive swing arm（16）To install matched bearings one （36）With matched bearings two（54）Endoporus be fulcrum reciprocating rotary swing, swing arm（16）On diamond pen（14）Nib will Crushing is circular shape.
- 2. double fulcrum single armed deep camber hydraulic pressure dressers according to claim 1, it is characterised in that：The fixed arm （17）Bottom surface pass through flat key one（45）Installed in T-shaped supporting plate（9）Top planes on, adjustment plate（49）Pass through screw one （48）Installed in T-shaped supporting plate（9）Side, adjust axle one（46）By pressing plate（44）It is axially fixed in adjustment plate（49）Endoporus In, adjust axle one（46）Front threads be arranged on fixed arm（17）Screwed hole in；Rotation adjustment axle one（46）, can make solid Fixed arm（17）In flat key one（45）Guiding under move left and right；Fixed arm（17）Top endoporus in matched bearings one is installed（36）, bearing gland one（24）With bearing gland two（35） By matched bearings one（36）Outer ring axial restraint, bearing gland two（35）Top be provided with end cap one（33）；Fixed arm（17） Bottom endoporus in matched bearings two is housed（54）, bearing gland three（53）With bearing gland four（56）By matched bearings two（54） Outer ring axial restraint, bearing gland four（56）Bottom be provided with end cap two（57）；Swing arm（16）And fixed arm（17）It is upper, Axle one is installed in lower endoporus（38）With axle two（40）, pass through locking nut one respectively（27）With locking nut two（55）It is fixed on Matched bearings one（36）With matched bearings two（54）Endoporus in, axle one（38）With axle two（40）Pass through screw two respectively（39）With Screw three（59）With swing arm（16）Connect as one；Axle one（38）Top and rotary oil cylinder（20）Output shaft pass through flat key Two（30）And shaft coupling（32）Connect as one, rotary oil cylinder（20）Pass through studs（18）, nut（19）, screw four （31）With oil cylinder installing plate（29）, fixed arm（17）Connect together；Axle one（38）With bearing gland one（24）, bearing gland two（35）Between sealing one is installed（37）With sealing two（28）, axle Two（40）With bearing gland three（53）Between sealing three is installed（58）.
- 3. double fulcrum single armed deep camber hydraulic pressure dressers according to claim 1, it is characterised in that：The swing arm （16）Buddha's warrior attendant penholder is installed in the endoporus of middle part（10）, diamond pen（14）Pass through holding screw（15）It is fixed on diamond pen Bar（10）Anterior endoporus in；Buddha's warrior attendant penholder（10）The face of cylinder on be milled with keyway, can be in swing arm（16）Screwing five （13）Guiding under horizontally slip, screw five（13）Buddha's warrior attendant penholder can be fixed（10）In swing arm（16）Relative position, Buddha's warrior attendant Penholder（10）Upper be equipped with is used for fine adjustment diamond penholder（10）Adjustment ring（11）With screw six（12）, make diamond pen（14）To axle one （38）With axle two（40）Line of centres value meets the requirement of crushing curvature.
- 4. double fulcrum single armed deep camber hydraulic pressure dressers according to claim 1, it is characterised in that：The grinding machineLathe bed side passes through screw seven（1）And pin（51）Base is installed（2）, base（2）Above T-shaped supporting plate is housed （9）, base（2）With T-shaped supporting plate（9）Between pass through flat key three（23）With screw eight（8）Link together, flat key three（23）Gu It is scheduled on base（2）Keyway in, T-shaped supporting plate（9）Above fixed block is housed（21）, base（2）Left surface equipped with adjustment Riser（6）And cover plate（4）, cover plate（4）With adjusting riser（6）It is fixed, adjust riser（6）And cover plate（4）Centre equipped with adjustment Axle two（5）, adjust axle two（5）Front threads be mounted in fixed block（21）Screwed hole in；Rotation adjustment axle two（5）It can make T-shaped Supporting plate（9）In flat key three（23）Guiding under in base（2）On horizontally slip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610699532.8A CN107520756B (en) | 2016-08-22 | 2016-08-22 | Double-fulcrum single-arm large-curvature hydraulic grinding wheel trimmer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610699532.8A CN107520756B (en) | 2016-08-22 | 2016-08-22 | Double-fulcrum single-arm large-curvature hydraulic grinding wheel trimmer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107520756A true CN107520756A (en) | 2017-12-29 |
| CN107520756B CN107520756B (en) | 2024-08-20 |
Family
ID=60748464
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610699532.8A Active CN107520756B (en) | 2016-08-22 | 2016-08-22 | Double-fulcrum single-arm large-curvature hydraulic grinding wheel trimmer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107520756B (en) |
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|---|---|---|---|---|
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| GB1269828A (en) * | 1969-06-27 | 1972-04-06 | Henry Folhe Swenson | Wheel dressers |
| DE3501933A1 (en) * | 1984-02-04 | 1985-08-08 | Hauni-Werke Körber & Co KG, 2050 Hamburg | Grinding machine |
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| CN105817999A (en) * | 2016-05-16 | 2016-08-03 | 无锡勇克精密机床制造有限公司 | Arc trimmer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3370385A (en) * | 1965-05-24 | 1968-02-27 | Nat Broach & Mach | Wheel dresser |
| GB1269828A (en) * | 1969-06-27 | 1972-04-06 | Henry Folhe Swenson | Wheel dressers |
| DE3501933A1 (en) * | 1984-02-04 | 1985-08-08 | Hauni-Werke Körber & Co KG, 2050 Hamburg | Grinding machine |
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| JPH09117861A (en) * | 1995-10-24 | 1997-05-06 | Denso Corp | Tool rest device with dresser for grinder |
| JP2002103223A (en) * | 2000-09-29 | 2002-04-09 | Japan Automat Mach Co Ltd | Device for dressing periphery of rotary grinding wheel |
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| JP2012236253A (en) * | 2011-05-12 | 2012-12-06 | Okamoto Machine Tool Works Ltd | Oscillation type grinding wheel-dressing device |
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| CN102672614A (en) * | 2012-05-24 | 2012-09-19 | 无锡市吉尔多轴承机械有限公司 | Diamond-pen rotary finishing positioning structure for complex grinding |
| CN102765056A (en) * | 2012-07-25 | 2012-11-07 | 无锡机床股份有限公司 | Dresser for CBN (cubic boron nitride) grinding wheel with bearing inner ring groove |
| CN103522189A (en) * | 2012-10-23 | 2014-01-22 | 洛阳嘉维轴承制造有限公司 | Method for finishing peach-shaped groove circular arcs of large-scale bearing |
| CN203109748U (en) * | 2013-01-15 | 2013-08-07 | 新乡亿威数控设备有限公司 | Grinding wheel outer diameter large-arc grinding roller base plane machine tool |
| CN103962914A (en) * | 2014-04-21 | 2014-08-06 | 浙江石轴数控设备有限公司 | Spherical roller bearing inner ring raceway grinder device and method thereof |
| CN204450217U (en) * | 2015-01-22 | 2015-07-08 | 宁波明润机械制造有限公司 | A kind of high-precision bearing internal groove grinding machine trimmer |
| CN204711820U (en) * | 2015-05-28 | 2015-10-21 | 无锡市东升自动化设备有限公司 | A kind of grinding machine grinding wheel arc dresser |
| CN105817999A (en) * | 2016-05-16 | 2016-08-03 | 无锡勇克精密机床制造有限公司 | Arc trimmer |
| CN205968655U (en) * | 2016-08-22 | 2017-02-22 | 襄阳博亚精工装备股份有限公司 | Big camber hydraulic pressure grinding wheel dresser of two fulcrum single armeds |
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| CN107520756B (en) | 2024-08-20 |
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