CN205393695U - A accurate grinding bistrique for perforation in pin wheel housing - Google Patents
A accurate grinding bistrique for perforation in pin wheel housing Download PDFInfo
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- CN205393695U CN205393695U CN201620144454.0U CN201620144454U CN205393695U CN 205393695 U CN205393695 U CN 205393695U CN 201620144454 U CN201620144454 U CN 201620144454U CN 205393695 U CN205393695 U CN 205393695U
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Abstract
The utility model discloses an accurate grinding bistrique for perforation in pin wheel housing, the bistrique includes the mount pad, a first support, and a second support, the gasket, location installation lid, the connecting axle, an angular contact ball bearing, the first rotor, first spacer ring, the second grinding wheel gasket, the shaping emery wheel, the first grinding wheel gasket, the second spacer ring, synchronous pulley, the second rotor, the third spacer ring, the 2nd angular contact ball bearing, the locking spacer ring, lock nut, second support and hold -in range, it is reliable relatively and simple, and lower cost, can satisfy the requirement of the internal perforation high accuracy of precision type reduction gear, can while fitting of grinding and two and half teeth, greatly put forward high pressure heater work efficiency rate, the bistrique has splendid sealed effect, and the service life is greatly extended, be convenient for change the shaping emery wheel, its application range has been widened greatly, and the big -button confirmation function structure is simple to use, and has a good application prospect.
Description
Technical field
This utility model relates to mechanical grinding technical field, is specifically related to a kind of for the accurate grinding bistrique of perforation in pin wheel housing.
Background technology
At present, the pin wheel housing of uniform interior perforation is mainly used in accurate decelerator, and the internal tooth number of perforations of pin wheel housing is more, and, for accurate decelerator, the phase angle relation between position degree and each interior perforation of internal perforation central distribution circle has degree of precision requirement.In order to ensure above-mentioned required precision, existing processing method mainly has: adopt accurate decelerator pin wheel housing grinding special purpose grinder to be processed, and it is all higher to equipment configuration and required precision, but, working (machining) efficiency and yield are relatively low, cause integrated cost higher.And, existing special purpose grinder bistrique has the following disadvantages, and (1) volume is bigger, it is difficult to the internal tooth of grinding small diameter；(2) bistrique is shaped as single profile of tooth, and grinding efficiency is relatively low；(3) sealing effectiveness is poor, and in grinding process, cutting fluid easily enters in bearing, affects grinding accuracy；(4) structure is complicated, and dismounting is not easily.
Utility model content
This utility model is solved the technical problem that it is overcome existing accurate decelerator pin wheel housing grinding special purpose grinder, and working (machining) efficiency and yield are relatively low, and integrated cost is higher and the problem of bistrique Shortcomings.Of the present utility model for the accurate grinding bistrique of perforation in pin wheel housing, relatively reliable and simple, less costly, it is possible to meet the high-precision requirement of internal perforation of accurate decelerator, energy is one whole tooth of grinding and two and half teeth simultaneously, being greatly enhanced working (machining) efficiency, bistrique has splendid sealing effectiveness, is greatly improved service life, it is conveniently replaceable forming grinding wheel, significantly widen its use scope, easy to use, have a good application prospect.
In order to achieve the above object, this utility model be the technical scheme is that
A kind of for the accurate grinding bistrique of perforation in pin wheel housing, it is characterized in that: include mounting seat, the first support, pad, location and installation lid, connect axle, the first angular contact ball bearing, the first rotor, the first spacer ring, the first emery wheel pad, forming grinding wheel, the second emery wheel pad, the second spacer ring, synchronous pulley, the second rotor, the 3rd spacer ring, the second angular contact ball bearing, locking spacer ring, locking nut, the second support and Timing Belt
Described second support, the first support are the left and right lower section being symmetricly set on mounting seat, and described first support, the second frame bottom connect by the first bolt is fixing,
Described connection axle crosses the bearing mounting hole of the bearing mounting hole of the first support, the second support, the front end of described connection axle is fixed on the second support by locking nut, described connection shaft rear end is fixed on the first support by location and installation lid, described pad is arranged between connection shaft rear end and location and installation lid
nullDescribed connection axle is socketed with locking spacer ring from front to back successively、Second angular contact ball bearing、3rd spacer ring、Second rotor、Synchronous pulley、Second spacer ring、Second emery wheel pad、Forming grinding wheel、First emery wheel pad、First spacer ring、The first rotor、First angular contact ball bearing，Described locking spacer ring、Second angular contact ball bearing、3rd spacer ring、Second rotor is arranged between outer wall and the inwall of the second bracket bearing installing hole connecting axle，Described synchronous pulley、Second spacer ring、Second emery wheel pad、Forming grinding wheel、First emery wheel pad、First spacer ring is arranged on the first support、Between second support，Described the first rotor、First angular contact ball bearing is arranged between outer wall and the inwall of the first bracket bearing installing hole connecting axle，Described Timing Belt is set on synchronous pulley，Described synchronous pulley is connected with the synchronous pulley installed on motor on grinding machine by Timing Belt，Carry out transmission，Described synchronous pulley rotates and drives forming grinding wheel to rotate，Realize grinding.
It is aforesaid a kind of for the accurate grinding bistrique of perforation in pin wheel housing, it is characterised in that: being additionally provided with the first positioning step pin between described first support, the second frame bottom, described first positioning step pins position is in the top of the first bolt.
It is aforesaid a kind of for the accurate grinding bistrique of perforation in pin wheel housing, it is characterised in that: the top of described first support is connected with mounting seat by the second positioning step pin.
It is aforesaid a kind of for the accurate grinding bistrique of perforation in pin wheel housing, it is characterised in that: the top of described second support is connected by the second bolt and mounting seat are fixing.
Aforesaid a kind of for the accurate grinding bistrique of perforation in pin wheel housing, it is characterized in that: the outer wall of described locking spacer ring is also socketed with one layer of oil seal washer, described oil seal washer is fixed between the outer wall of the inwall of the second bracket bearing installing hole, locking spacer ring by hole jump ring.
Aforesaid a kind of for the accurate grinding bistrique of perforation in pin wheel housing, it is characterized in that: described the first rotor, bitrochanteric outer wall cross section are first step shape, described first support, the inwall of the second bracket bearing installing hole are second step shape with the cross section of the first rotor, the second rotor contact place, described first step shape, second step mating shapes engage, described first support, the second support are additionally provided with screw thread injecting hole, described screw thread injecting hole engages place with first step shape, second step shape and is connected, and forms air seal structure.
Aforesaid a kind of for the accurate grinding bistrique of perforation in pin wheel housing, it is characterized in that: described forming grinding wheel includes complete toothed region and is positioned at half toothed region that complete toothed region lateral symmetry is arranged, and is connected by easement curve portion between described half toothed region with complete toothed region.
Based on above-mentioned for the method for grinding of the accurate grinding bistrique of perforation in pin wheel housing, it is characterised in that: comprise the following steps,
Step (1), is installed to mounting seat on grinding machine；
Step (2), is connected synchronous pulley with the synchronous pulley installed on motor on grinding machine by Timing Belt, it is achieved transmission；
Step (3), by corresponding for interior perforation to be processed with on pin wheel housing for forming grinding wheel, it is achieved one complete profile of tooth of grinding and two and half profiles of tooth simultaneously,
Step (4), completes a complete profile of tooth and two and half profile grinding of gear, turns to next internal tooth hole grinding on pin wheel housing, until completing all interior perforation grindings on pin wheel housing.
The method for grinding of the accurate grinding bistrique being previously described in pin wheel housing perforation, it is characterised in that: the belt wheel number of teeth of step (2) synchronous pulley is less than the belt wheel number of teeth of synchronous pulley on motor, in order to make forming grinding wheel obtain big grinding speed.
The method for grinding of the accurate grinding bistrique being previously described in pin wheel housing perforation, it is characterised in that: step (4) is turning to next internal tooth hole grinding on pin wheel housing, it is necessary to when being replaced with abrasive wheel, comprise the following steps,
(1) the first bolt, the second bolt, locking nut are unclamped；
(2) take off successively and be socketed in the locking spacer ring connected on axle, the second angular contact ball bearing, the 3rd spacer ring, the second rotor, synchronous pulley, the second spacer ring, the second emery wheel pad, forming grinding wheel；
(3) it is replaced with abrasive wheel, and forming grinding wheel, the second emery wheel pad, the second spacer ring, synchronous pulley, the second rotor, the 3rd spacer ring, the second angular contact ball bearing, locking spacer ring are overlapped successively and receive on connection axle；
(4) positioned by the first positioning step pin, the second positioning step pin, tighten the first bolt, the second bolt, locking nut, complete the replacing of forming grinding wheel.
The beneficial effects of the utility model are: of the present utility model for the accurate grinding bistrique of perforation in pin wheel housing, bistrique and method for grinding are relatively reliable and simple, less costly, it is possible to meet the high-precision requirement of internal perforation of accurate decelerator, and have the advantage that
(1) shape after forming grinding wheel correction of the flank shape includes: the profile of tooth completed, two easement curves, two and half profiles of tooth, and energy is one whole tooth of grinding and two and half teeth simultaneously, are greatly enhanced working (machining) efficiency；
(2) steps type seal is constituted between support and rotor, in grinding process, by injecting gas to the screwed hole of support, it is achieved air seal, it is prevented that cuttings liquid and impurity enter in bearing；Being provided with oil seal washer between connection axle and support and realize oil sealing, owing to adopting hermetic seal and oil sealing to seal simultaneously, this bistrique has splendid sealing effectiveness, is greatly improved service life；
(3) connecting shaft size little, install compact, this bistrique can realize grinding in less space, during grinding dissimilar tooth form, as long as being replaced with abrasive wheel, has significantly widened its use scope；
(4) by tightening or unclamp locking nut, bolt, get final product Fast Installation and dismounting bistrique, and be provided with detent mechanism, it is simple to be replaced with abrasive wheel, easy to use, have a good application prospect.
Accompanying drawing explanation
Fig. 1 is of the present utility model for the structural representation of the accurate grinding bistrique of perforation in pin wheel housing.
Fig. 2 is the structural representation of air seal structure of the present utility model.
Fig. 3 is the structural representation of forming grinding wheel of the present utility model.
In accompanying drawing, the implication of labelling is as follows:
1: mounting seat；2: the first supports；3: pad；4: location and installation lid；5: connect axle；6: the first angular contact ball bearings；7: the first rotor；8: the first spacer rings；9: the first emery wheel pads；10: forming grinding wheel；1001: complete toothed region；1002: half toothed region；1003: easement curve portion；11: the first positioning step pins；12: the first bolts；13: the second emery wheel pads；14: the second spacer rings；15: synchronous pulley；16: the second rotors；17: the three spacer rings；18: the second angular contact ball bearings；19: locking spacer ring；20: locking nut；21: oil seal washer；22: hole jump ring；23: the second supports；24: Timing Belt；25: the second bolts 25；26: the second positioning step pins；27: screw thread injecting hole.
Detailed description of the invention
Below in conjunction with Figure of description, this utility model is further described.
As shown in Figure 1, of the present utility model for the accurate grinding bistrique of perforation in pin wheel housing, including mounting seat the 1, first support 2, pad 3, location and installation lid 4, connect axle the 5, first angular contact ball bearing 6, the first rotor the 7, first spacer ring the 8, first emery wheel pad 9, forming grinding wheel the 10, second emery wheel pad the 13, second spacer ring 14, synchronous pulley the 15, second rotor the 16, the 3rd spacer ring the 17, second angular contact ball bearing 18, locking spacer ring 19, locking nut the 20, second support 23 and Timing Belt 24
Described second support the 23, first support 2, in the left and right lower section being symmetricly set on mounting seat 1, connects by the first bolt 12 is fixing bottom described first support the 2, second support 23,
Described connection axle 5 crosses the bearing mounting hole of the bearing mounting hole of the first support 2, the second support 23, the front end of described connection axle 5 is fixed on the second support 23 by locking nut 20, described connection axle 5 rear end is fixed on the first support 2 by location and installation lid 4, described pad 3 is arranged between connection axle 5 rear end and location and installation lid 4
nullDescribed connection axle 5 is socketed with locking spacer ring 19 from front to back successively、Second angular contact ball bearing 18、3rd spacer ring 17、Second rotor 16、Synchronous pulley 15、Second spacer ring 14、Second emery wheel pad 13、Forming grinding wheel 10、First emery wheel pad 9、First spacer ring 8、The first rotor 7、First angular contact ball bearing 6，Described locking spacer ring 19、Second angular contact ball bearing 18、3rd spacer ring 17、Second rotor 16 is arranged between outer wall and the inwall of the second support 23 bearing mounting hole connecting axle 5，Described synchronous pulley 15、Second spacer ring 14、Second emery wheel pad 13、Forming grinding wheel 10、First emery wheel pad 9、First spacer ring 8 is arranged on the first support 2、Between second support 23，Described the first rotor 7、First angular contact ball bearing 6 is arranged between outer wall and the inwall of the first support 2 bearing mounting hole connecting axle 5，Described Timing Belt 24 is set on synchronous pulley 15，Described synchronous pulley 15 is connected with the synchronous pulley installed on motor on grinding machine by Timing Belt 24，Carry out transmission，Described synchronous pulley 15 rotates and drives forming grinding wheel 10 to rotate，Realize grinding.
It is additionally provided with the first positioning step pin 11 between bottom described first support the 2, second support 23, described first positioning step pin 11 is positioned at the top of the first bolt 12, the top of described first support 2 is connected with mounting seat 1 by the second positioning step pin 26, and the top of described second support 23 is connected by the second bolt 25 is fixing with mounting seat 1.
The outer wall of described locking spacer ring 19 is also socketed with one layer of oil seal washer 21, and described oil seal washer 21 is fixed between the outer wall of the inwall of the second support 23 bearing mounting hole, locking spacer ring 19 by hole jump ring 22.
The outer wall cross section of described the first rotor the 7, second rotor 16 is first step shape, the described inwall of first support the 2, second support 23 bearing mounting hole and the cross section of the first rotor the 7, second rotor 16 contact position are second step shape, described first step shape, second step mating shapes engage, as shown in Figure 2, described first support the 2, second support 23 is additionally provided with screw thread injecting hole 27, described screw thread injecting hole 27 engages place with first step shape, second step shape and is connected, and forms air seal structure.
Accurate grinding bistrique of the present utility model, owing to adopting hermetic seal and oil sealing to seal simultaneously, this bistrique has splendid sealing effectiveness, is greatly improved service life.
As shown in Figure 3, described forming grinding wheel 10 includes complete toothed region 1001 and is positioned at half toothed region 1002 that complete toothed region 1001 lateral symmetry is arranged, it is connected by easement curve portion 1003 between described half toothed region 1002 with complete toothed region 1001, one profile of tooth completed, two easement curves, two and half profiles of tooth, energy is one whole tooth of grinding and two and half teeth simultaneously, are greatly enhanced working (machining) efficiency.
Comprise the following steps for the method for grinding of the accurate grinding bistrique of perforation in pin wheel housing based on above-mentioned,
Step (1), is installed to mounting seat 1 on grinding machine；
Step (2), synchronous pulley 15 is connected with the synchronous pulley installed on motor on grinding machine by Timing Belt 24, realize transmission, here the belt wheel number of teeth of synchronous pulley 15 is less than the belt wheel number of teeth of synchronous pulley on motor, to make forming grinding wheel 10 obtain big grinding speed, improve grinding efficiency further；
Step (3), by corresponding for interior perforation to be processed with on pin wheel housing for forming grinding wheel 10, it is achieved one complete profile of tooth of grinding and two and half profiles of tooth simultaneously,
Step (4), completes a complete profile of tooth and two and half profile grinding of gear, turns to next internal tooth hole grinding on pin wheel housing, until completing all interior perforation grindings on pin wheel housing, turning to next internal tooth hole grinding on pin wheel housing here, it is necessary to when being replaced with abrasive wheel 10, comprise the following steps
(1) first bolt the 12, second bolt 25, locking nut 20 are unclamped；
(2) take off successively and be socketed in locking spacer ring the 19, second angular contact ball bearing the 18, the 3rd spacer ring the 17, second rotor 16 connected on axle 5, synchronous pulley the 15, second spacer ring the 14, second emery wheel pad 13, forming grinding wheel 10；
(3) it is replaced with abrasive wheel 10, and forming grinding wheel the 10, second emery wheel pad the 13, second spacer ring 14, synchronous pulley the 15, second rotor the 16, the 3rd spacer ring the 17, second angular contact ball bearing 18, locking spacer ring 19 are overlapped successively and receive on connection axle 5；
(4) positioned by first positioning step pin the 11, second positioning step pin 26, tighten first bolt the 12, second bolt 25, locking nut 20, complete the replacing of forming grinding wheel 10.
Of the present utility model for the accurate grinding bistrique of perforation in pin wheel housing, it is possible to for grinding diameter more than 80mm, less than the scope of 100mm, have been used for a kind of part containing internal tooth arrangement of grinding.Owing to this part internal tooth pitch circle diameter is less, internal tooth profile accuracy requires height, conventional bistrique is difficult to accurately grinding, by using bistrique of the present utility model, achieve the highly-efficient processing of part, after testing, the profile of tooth that grinding goes out, no matter all reach requirement in dimensional accuracy, geometric accuracy, surface roughness.
In sum, of the present utility model relatively reliable and simple for the accurate grinding bistrique of perforation, bistrique and method for grinding in pin wheel housing, less costly, it is possible to meet the high-precision requirement of internal perforation of accurate decelerator, and have the advantage that
(1) shape after forming grinding wheel correction of the flank shape includes: the profile of tooth completed, two easement curves, two and half profiles of tooth, and energy is one whole tooth of grinding and two and half teeth simultaneously, are greatly enhanced working (machining) efficiency；
(2) steps type seal is constituted between support and rotor, in grinding process, by injecting gas to the screwed hole of support, it is achieved air seal, it is prevented that cuttings liquid and impurity enter in bearing；Being provided with oil seal washer between connection axle and support and realize oil sealing, owing to adopting hermetic seal and oil sealing to seal simultaneously, this bistrique has splendid sealing effectiveness, is greatly improved service life；
(3) connecting shaft size little, install compact, this bistrique can realize grinding in less space, during grinding dissimilar tooth form, as long as being replaced with abrasive wheel, has significantly widened its use scope；
(4) by tightening or unclamp locking nut, bolt, get final product Fast Installation and dismounting bistrique, and be provided with detent mechanism, it is simple to be replaced with abrasive wheel, easy to use, have a good application prospect.
Of the present utility model ultimate principle, principal character and advantage have more than been shown and described.Skilled person will appreciate that of the industry; this utility model is not restricted to the described embodiments; described in above-described embodiment and description is that principle of the present utility model is described; under the premise without departing from this utility model spirit and scope; this utility model also has various changes and modifications, and these changes and improvements both fall within the scope of claimed this utility model.This utility model claims scope and is defined by appending claims and equivalent thereof.
Claims (7)
1. one kind for the accurate grinding bistrique of perforation in pin wheel housing, it is characterized in that: include mounting seat (1), first support (2), pad (3), location and installation lid (4), connect axle (5), first angular contact ball bearing (6), the first rotor (7), first spacer ring (8), first emery wheel pad (9), forming grinding wheel (10), second emery wheel pad (13), second spacer ring (14), synchronous pulley (15), second rotor (16), 3rd spacer ring (17), second angular contact ball bearing (18), locking spacer ring (19), locking nut (20), second support (23) and Timing Belt (24),
Described second support (23), the first support (2) are in the left and right lower section being symmetricly set on mounting seat (1), and described first support (2), the second support (23) bottom connect by the first bolt (12) is fixing,
Described connection axle (5) crosses the bearing mounting hole of the bearing mounting hole of the first support (2), the second support (23), the front end of described connection axle (5) is fixed on the second support (23) by locking nut (20), described connection axle (5) rear end is fixed on the first support (2) by location and installation lid (4), described pad (3) is arranged between connection axle (5) rear end and location and installation lid (4)
nullDescribed connection axle (5) is socketed with locking spacer ring (19) from front to back successively、Second angular contact ball bearing (18)、3rd spacer ring (17)、Second rotor (16)、Synchronous pulley (15)、Second spacer ring (14)、Second emery wheel pad (13)、Forming grinding wheel (10)、First emery wheel pad (9)、First spacer ring (8)、The first rotor (7)、First angular contact ball bearing (6)，Described locking spacer ring (19)、Second angular contact ball bearing (18)、3rd spacer ring (17)、Second rotor (16) is arranged between outer wall and the inwall of the second support (23) bearing mounting hole connecting axle (5)，Described synchronous pulley (15)、Second spacer ring (14)、Second emery wheel pad (13)、Forming grinding wheel (10)、First emery wheel pad (9)、First spacer ring (8) is arranged on the first support (2)、Between second support (23)，Described the first rotor (7)、First angular contact ball bearing (6) is arranged between outer wall and the inwall of the first support (2) bearing mounting hole connecting axle (5)，Described Timing Belt (24) is set on synchronous pulley (15)，Described synchronous pulley (15) is connected with the synchronous pulley installed on motor on grinding machine by Timing Belt (24)，Carry out transmission，Described synchronous pulley (15) rotates and drives forming grinding wheel (10) to rotate，Realize grinding.
2. according to claim 1 a kind of for the accurate grinding bistrique of perforation in pin wheel housing, it is characterized in that: described first support (2), the second support (23) are additionally provided with the first positioning step pin (11) between bottom, and described first positioning step pin (11) is positioned at the top of the first bolt (12).
3. according to claim 1 a kind of for the accurate grinding bistrique of perforation in pin wheel housing, it is characterised in that: the top of described first support (2) is connected with mounting seat (1) by the second positioning step pin (26).
4. according to claim 1 a kind of for the accurate grinding bistrique of perforation in pin wheel housing, it is characterised in that: the top of described second support (23) is connected by the second bolt (25) and mounting seat (1) are fixing.
5. according to claim 1 a kind of for the accurate grinding bistrique of perforation in pin wheel housing, it is characterized in that: the outer wall of described locking spacer ring (19) is also socketed with one layer of oil seal washer (21), described oil seal washer (21) is fixed between the outer wall of the inwall of the second support (23) bearing mounting hole, locking spacer ring (19) by hole jump ring (22).
6. according to claim 1 a kind of for the accurate grinding bistrique of perforation in pin wheel housing, it is characterized in that: described the first rotor (7), the outer wall cross section of the second rotor (16) is first step shape, described first support (2), the inwall of the second support (23) bearing mounting hole and the first rotor (7), the cross section of the second rotor (16) contact position is second step shape, described first step shape, second step mating shapes engages, described first support (2), second support (23) is additionally provided with screw thread injecting hole (27), described screw thread injecting hole (27) and first step shape, second step shape engaging place is connected, form air seal structure.
7. according to claim 1 a kind of for the accurate grinding bistrique of perforation in pin wheel housing, it is characterized in that: described forming grinding wheel (10) includes complete toothed region (1001) and is positioned at half toothed region (1002) that complete toothed region (1001) lateral symmetry is arranged, and is connected by easement curve portion (1003) between described half toothed region (1002) and complete toothed region (1001).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620144454.0U CN205393695U (en) | 2016-02-26 | 2016-02-26 | A accurate grinding bistrique for perforation in pin wheel housing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620144454.0U CN205393695U (en) | 2016-02-26 | 2016-02-26 | A accurate grinding bistrique for perforation in pin wheel housing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205393695U true CN205393695U (en) | 2016-07-27 |
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ID=56423865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620144454.0U Withdrawn - After Issue CN205393695U (en) | 2016-02-26 | 2016-02-26 | A accurate grinding bistrique for perforation in pin wheel housing |
Country Status (1)
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| CN (1) | CN205393695U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105562841A (en) * | 2016-02-26 | 2016-05-11 | 南京康尼机电股份有限公司 | Precise grinding head for inner tooth hole of pin wheel housing and grinding method |
-
2016
- 2016-02-26 CN CN201620144454.0U patent/CN205393695U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105562841A (en) * | 2016-02-26 | 2016-05-11 | 南京康尼机电股份有限公司 | Precise grinding head for inner tooth hole of pin wheel housing and grinding method |
| CN105562841B (en) * | 2016-02-26 | 2017-09-29 | 南京康尼机电股份有限公司 | A kind of accurate grinding bistrique and method for grinding for perforation in pin wheel housing |
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Granted publication date: 20160727 Effective date of abandoning: 20170929 |