CN103357798A - Cold rolling measuring and controlling device for workblank of bearing ring - Google Patents
Cold rolling measuring and controlling device for workblank of bearing ring Download PDFInfo
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- CN103357798A CN103357798A CN2013102721749A CN201310272174A CN103357798A CN 103357798 A CN103357798 A CN 103357798A CN 2013102721749 A CN2013102721749 A CN 2013102721749A CN 201310272174 A CN201310272174 A CN 201310272174A CN 103357798 A CN103357798 A CN 103357798A
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- cold rolling
- sliding seat
- fixedly connected
- ferrule blanks
- bearing ferrule
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Abstract
The invention relates to the field of bearing ring manufacturing and measuring devices and aims at providing a cold rolling measuring and controlling device for a workblank of a bearing ring. The cold rolling measuring and controlling device for the workblank of the bearing ring comprises a fixed seat, a sliding seat connected with the fixed seat through a transverse sliding rail, a measuring head fixedly connected with the sliding seat, a collision mechanism driving the measuring head to collide against the outer periphery of the workblank of the bearing ring, and a measuring and controlling device. When the cold rolling measuring and controlling device for the workblank of the bearing ring is used, the collision mechanism pushes the measuring head to collide against the outer periphery of the workblank of the bearing ring, the outer periphery of the workblank of the bearing ring enables the measuring and controlling device to act through the measuring head and the collision mechanism along with the expansion of the outer diameter of the workblank of the bearing ring during the cold rolling, and when the outer diameter of the workblank of the bearing ring reaches the specified value, the measuring and controlling device transmits a signal to a controller and then the controller controls a bearing ring cold rolling device to stop and get out of the cold rolling state. The cold rolling measuring and controlling device for the workblank of the bearing ring is relatively high in measuring efficiency and measuring precision.
Description
Technical field
The present invention relates to bearing ring and make measurement mechanism field, the cold rolling measure and control device of especially a kind of bearing ferrule blanks.
Background technology
General bearing ferrule blanks is made by casting or forging; The disclosure of the Invention of Chinese patent notification number CN 1243207A a kind of production method of collar blank of rolling bearing; Be particularly related to the application of centrifugal casting technique in the collar blank of rolling bearing manufacture process.It is electric furnace steel making, and centrifugal casting and bearing forging technology combine, thereby reaches the production cost that reduces collar blank of rolling bearing and put forward high-quality purpose.The dimensional accuracy of the bearing ferrule blanks that casting or forging are made is lower and allowance is larger; Making bearing ferrule blanks with the cold rolling device of bearing ring can improve the dimensional accuracy of bearing ferrule blanks and reduce allowance; The structure of the cold rolling device of bearing ring can obtain from the utility model of the disclosed a kind of short cylindrical roller bearing outer ring cold-rolling machine device of Chinese patent announcement CN202291177U to understand; Owing to adopt during the bearing ferrule blanks cold rolling at present the survey tool such as gage that bearing ferrule blanks is measured, exist and measure efficient and the lower deficiency of certainty of measurement; Therefore, design a kind of efficient and higher cold rolling measure and control device of bearing ferrule blanks of certainty of measurement measured, become problem demanding prompt solution.
Summary of the invention
The objective of the invention is to adopt when overcoming present bearing ferrule blanks cold rolling the survey tool such as gage that bearing ferrule blanks is measured, exist and measure efficient and the lower deficiency of certainty of measurement, a kind of efficient and higher cold rolling measure and control device of bearing ferrule blanks of certainty of measurement measured is provided.
Concrete technical scheme of the present invention is:
The cold rolling measure and control device of a kind of bearing ferrule blanks, sliding seat, the gage outfit that is fixedly connected with sliding seat that comprises holder, is connected by horizontal slide rail with holder, conflict mechanism and the controller that orders about the outer gusset of gage outfit conflict bearing ferrule blanks.When the cold rolling measure and control device of this bearing ferrule blanks uses, the outer gusset of conflict mechanism urges gage outfit conflict bearing ferrule blanks; During cold rolling, expansion along with the bearing ferrule blanks external diameter, the outer gusset of bearing ferrule blanks makes the controller action by gage outfit and conflict mechanism, when the external diameter of bearing ferrule blanks reaches setting, controller sends signal to controller, and the cold rolling device of controller Control Shaft bearing ring stops and withdrawing from cold rolling state.The cold rolling measure and control device measurement efficient of this bearing ferrule blanks and certainty of measurement are higher.
As preferably, described conflict mechanism comprises the connecting rod hinged with sliding seat, axis and laterally slide rail oil cylinder parallel and that be fixedly connected with holder, universal joint or floating junction; The cylinder bar of oil cylinder is connected with connecting rod by universal joint or floating junction.Conflict mechanism has oil cylinder convenient puck position of adjusting can adapt to cold rolling different-diameter bearing ferrule blanks the time, makes the outer gusset of pinch roller conflict bearing ferrule blanks.
As preferably, described conflict mechanism comprises that the two ends of the first stage clip, the fixed block that is fixedly connected with sliding seat, the backstop that is fixedly connected with holder, the first stage clip push down respectively fixed block and backstop.It is simple and practical that conflict mechanism has the first stage clip.
As preferably, the fixed block that described conflict mechanism comprises extension spring, be fixedly connected with sliding seat, the positive stop that is fixedly connected with holder, the two ends of extension spring are connected with fixed block with positive stop respectively.It is simple and practical that conflict mechanism has extension spring.
As preferably, first displacement transducer or the grating scale of described controller for being fixedly connected with holder; The axis of the first measuring staff of the first displacement transducer is parallel with horizontal slide rail and be fixedly connected with sliding seat with an end of sliding seat grating gauge head relative or grating scale.Controller is that the first displacement transducer or grating scale precision are higher.
As preferably, described gage outfit comprises the pinch roller that the other end of fixed bar that an end is fixedly connected with sliding seat, at least one and fixed bar articulates; During cold rolling, the outer gusset of the front side conflict bearing ferrule blanks of the outer gusset of pinch roller.Gage outfit is simple in structure.
As preferably, described gage outfit comprises fixed bar that an end and sliding seat be fixedly connected with, axis and laterally slide rail second displacement sensor parallel and that be fixedly connected with fixed bar, two pinch rollers, slide block, cover plate and the second stage clips; Fixed bar is provided with chute parallel with horizontal slide rail and that connect with the rear side of fixed bar; Slide block and the second stage clip are positioned at chute successively, and cover plate is pushed down the second stage clip and is fixedly connected with the rear side of fixed bar; The front end of the second measuring staff of second displacement sensor passes the rear end of cover plate and stage clip and slide block and conflicts; Pinch roller and fixed bar articulate; Another pinch roller and slide block articulate; During cold rolling, the outer gusset of the front side conflict bearing ferrule blanks of the outer gusset of two pinch rollers.When pinch roller was two, two pinch rollers and short cylindrical roll milling wheel were tangent with the outer gusset of bearing ferrule blanks respectively, and the second displacement sensor that has by gage outfit cooperates with the first displacement transducer, makes the observing and controlling precision higher.
As preferably, described two pinch rollers are distributed in the both sides by the plane of the axis of the axis of the short cylindrical roll milling wheel of the cold rolling device of bearing ring and short cylindrical core roller.Cold the tossing about in bed of bearing ferrule blanks moved steadily.
Compared with prior art, the invention has the beneficial effects as follows: one. the cold rolling measure and control device measurement efficient of this bearing ferrule blanks and certainty of measurement are higher.Two. conflict mechanism has oil cylinder convenient puck position of adjusting can adapt to cold rolling different-diameter bearing ferrule blanks the time, makes the outer gusset of pinch roller conflict bearing ferrule blanks.Three. conflict mechanism have the first stage clip or extension spring simple and practical.Four. controller is that the first displacement transducer or grating scale precision are higher.Five. gage outfit is simple in structure.Six. when pinch roller was two, two pinch rollers and short cylindrical roll milling wheel were tangent with the outer gusset of bearing ferrule blanks respectively, and the second displacement sensor that has by gage outfit cooperates with the first displacement transducer, makes the observing and controlling precision higher.Seven. two pinch rollers are distributed in the both sides by the plane of the axis of the axis of the short cylindrical roll milling wheel of the cold rolling device of bearing ring and short cylindrical core roller, make bearing ferrule blanks cold toss about in bed steadily moving.Eight. the axis of the axis of the first measuring staff of the first displacement transducer and the second measuring staff of second displacement sensor is parallel with horizontal slide rail respectively, is convenient to the controller analytical calculation.
Description of drawings
Fig. 1 is embodiments of the invention 1 structural representations;
Fig. 2 is embodiments of the invention 2 structural representations;
Fig. 3 is the second structural representation of conflict mechanism among Fig. 1 and Fig. 2;
Fig. 4 is the third structural representation of conflict mechanism among Fig. 1 and Fig. 2.
Among the figure: horizontal slide rail-1, holder-2, sliding seat-3, connecting rod-4, oil cylinder-5, cylinder bar-51, universal joint-6, the first displacement transducer-7, the first measuring staff-71, fixed bar-8, chute-81, second displacement sensor-9, the second measuring staff-91, the first stage clip-10, fixed block-11, backstop-12, slide block-13, cover plate-14, the second stage clip-15, pinch roller-16, bearing ferrule blanks-17, short cylindrical roll milling wheel-18, short cylindrical core roller-19, positive stop-20, extension spring-21.
The specific embodiment
The present invention is described further below in conjunction with shown in the accompanying drawing.
Described conflict mechanism comprises with sliding seat 3 by the hinged connecting rod 4 of hinge, axis and horizontal slide rail 1 oil cylinder 5, universal joint 6 or floating junction parallel and that be connected with holder 2 screws; In the present embodiment, the cylinder bar 51 of oil cylinder 5 is connected with connecting rod 4 by universal joint 6.
Described controller is the first displacement transducer 7 or the grating scale that is connected with holder 2 screws; In the present embodiment, it is the first displacement transducer 7; The axis of the first measuring staff 71 of the first displacement transducer 7 is with laterally slide rail 1 is parallel and relative with an end of sliding seat 3.
Described gage outfit comprises that the other end of fixed bar 8 that an end is connected with sliding seat 3 screws, two and fixed bar 8 is by the pinch roller 16 of rotating shaft and bearing hinge joint; During cold rolling, the outer gusset of the front side conflict bearing ferrule blanks 17 of the outer gusset of pinch roller 16.
Described pinch roller 16 has two of both sides on plane of the axis of the axis that is symmetrically distributed in the short cylindrical roll milling wheel 18 by the cold rolling device of bearing ring and short cylindrical core roller 19.
The second structure of described conflict mechanism is as shown in Figure 3: described conflict mechanism comprises that the two ends of the first stage clip 10, the fixed block 11 that is connected with sliding seat 3 screws, the backstop 12 that is connected with holder 2 screws, the first stage clip 10 push down respectively fixed block 11 and backstop 12.
The third structure of described conflict mechanism is as shown in Figure 4: are connected with fixed block with positive stop 20 respectively and are connected in the two ends that described conflict mechanism comprises extension spring 21, the fixed block 11 that is connected with sliding seat 3 screws, the positive stop 20 that is connected with holder 2 screws, extension spring 21.
When the cold rolling measure and control device of this bearing ferrule blanks used, outer gusset or the first stage clip 10 that the cylinder bar 51 of oil cylinder 5 passes through universal joint 6, connecting rod 4, sliding seat 3 and fixed bar 8 promotion pinch rollers 16 conflict bearing ferrule blanks 17 promoted the outer gusset of pinch rollers 16 conflict bearing ferrule blanks 17 or extension spring 21 spurs pinch rollers 16 conflict bearing ferrule blanks 17 by sliding seat 3 and fixed bar 8 outer gusset by sliding seat 3 and fixed bar 8; During cold rolling, expansion along with bearing ferrule blanks 17 external diameters, the outer gusset of bearing ferrule blanks 17 is by pinch roller 16, fixed bar 8, sliding seat 3, connecting rod 4 and universal joint 6, the cylinder bar 51 that promotes oil cylinder 5 overcomes the servo-actuated retraction of resistance of oil cylinder 5 back pressures and sliding seat 3 is retreated or the resistance that overcomes the first stage clip 10 or extension spring 21 retreats sliding seat 3, the first measuring staff 71 of the first displacement transducer 7 under sliding seat 3 effect along axial-movement, when the external diameter of bearing ferrule blanks 17 reaches setting, the first displacement transducer 7 sends signal to controller, and the cold rolling device of controller Control Shaft bearing ring stops and withdrawing from cold rolling state.
Described conflict mechanism comprises with sliding seat 3 by the hinged connecting rod 4 of hinge, axis and horizontal slide rail 1 oil cylinder 5, universal joint 6 or floating junction parallel and that be connected with holder 2 screws; In the present embodiment, the cylinder bar 51 of oil cylinder 5 is connected with connecting rod 4 by universal joint 6.
Described controller is the first displacement transducer 7 or the grating scale that is connected with holder 2 screws; In the present embodiment, it is the first displacement transducer 7; The axis of the first measuring staff 71 of the first displacement transducer 7 is with laterally slide rail 1 is parallel and relative with an end of sliding seat 3.
Described gage outfit comprises fixed bar 8, the axis and horizontal slide rail 1 second displacement sensor 9 parallel and that be connected with fixed bar 8 screws, two pinch rollers 16, slide block 13, cover plate 14 and the second stage clips 15 that an end and sliding seat 3 screws connect; Fixed bar 8 has chute 81 parallel with horizontal slide rail 1 and that connect with the rear side of fixed bar 8; Described chute 81 is the dovetail chute, slide block 13 and chute 81 matched in clearance; Slide block 13 and the second stage clip 15 are positioned at chute 81 successively, and cover plate 14 is pushed down the second stage clip 15 and is connected with the rear side screw of fixed bar 8; The front end of the second measuring staff 91 of second displacement sensor 9 passes the rear end of cover plate 14 and stage clip and slide block 13 and conflicts; A pinch roller 16 is by rotating shaft and bearing and fixed bar 8 pivot joints; Another pinch roller 16 is by rotating shaft and bearing and slide block 13 pivot joints; During cold rolling, the outer gusset of the front side conflict bearing ferrule blanks 17 of the outer gusset of two pinch rollers 16.
Described two pinch rollers 16 are distributed in the both sides by the plane of the axis of the axis of the short cylindrical roll milling wheel 18 of the cold rolling device of bearing ring and short cylindrical core roller 19.
The second structure of described conflict mechanism is as shown in Figure 3: described conflict mechanism comprises that the two ends of the first stage clip 10, the fixed block 11 that is connected with sliding seat 3 screws, the backstop 12 that is connected with holder 2 screws, the first stage clip 10 push down respectively fixed block 11 and backstop 12.
The third structure of described conflict mechanism is as shown in Figure 4: are connected with fixed block with positive stop 20 respectively and are connected in the two ends that described conflict mechanism comprises extension spring 21, the fixed block 11 that is connected with sliding seat 3 screws, the positive stop 20 that is connected with holder 2 screws, extension spring 21.
When the cold rolling measure and control device of this bearing ferrule blanks used, outer gusset or the first stage clip 10 that the cylinder bar 51 of oil cylinder 5 passes through universal joint 6, connecting rod 4, sliding seat 3 and fixed bar 8 promotion pinch rollers 16 conflict bearing ferrule blanks 17 promoted the outer gusset of pinch rollers 16 conflict bearing ferrule blanks 17 or extension spring 21 spurs pinch rollers 16 conflict bearing ferrule blanks 17 by sliding seat 3 and fixed bar 8 outer gusset by sliding seat 3 and fixed bar 8; During cold rolling, expansion along with bearing ferrule blanks 17 external diameters, the outer gusset of bearing ferrule blanks 17 is by pinch roller 16, fixed bar 8, sliding seat 3, connecting rod 4 and universal joint 6, the cylinder bar 51 that promotes oil cylinder 5 overcomes the servo-actuated retraction of resistance of oil cylinder 5 back pressures and sliding seat 3 is retreated or the resistance that overcomes the first stage clip 10 or extension spring 21 retreats sliding seat 3, the first measuring staff 71 of the first displacement transducer 7 under sliding seat 3 effect along axial-movement, the second measuring staff 91 of second displacement sensor 9 under slide block 13 effect along axial-movement, when the external diameter of bearing ferrule blanks 17 reaches setting, the first displacement transducer 7 and second displacement sensor 9 send signal to controller, and the cold rolling device of controller Control Shaft bearing ring stops and withdrawing from cold rolling state.
The invention has the beneficial effects as follows: the cold rolling measure and control device measurement efficient of this bearing ferrule blanks and certainty of measurement are higher.Conflict mechanism has oil cylinder convenient puck position of adjusting can adapt to cold rolling different-diameter bearing ferrule blanks the time, makes the outer gusset of pinch roller conflict bearing ferrule blanks.Conflict mechanism have the first stage clip or extension spring simple and practical.Controller is that the first displacement transducer precision is higher.Gage outfit is simple in structure.When pinch roller was two, two pinch rollers and short cylindrical roll milling wheel were tangent with the outer gusset of bearing ferrule blanks respectively, and the second displacement sensor that has by gage outfit cooperates with the first displacement transducer, makes the observing and controlling precision higher.Two pinch rollers are distributed in the both sides by the plane of the axis of the axis of the short cylindrical roll milling wheel of the cold rolling device of bearing ring and short cylindrical core roller, make bearing ferrule blanks cold toss about in bed steadily moving.The axis of the axis of the first measuring staff of the first displacement transducer and the second measuring staff of second displacement sensor is parallel with horizontal slide rail respectively, is convenient to the controller analytical calculation.
It is apparent to one skilled in the art that the present invention can change into various ways, and such change is not thought and departed from the scope of the present invention.The apparent modification of the technical staff to described field that all are such will be included within the scope of this claim.
Claims (8)
1. cold rolling measure and control device of bearing ferrule blanks, it is characterized in that sliding seat, the gage outfit that is fixedly connected with sliding seat that comprises holder, is connected by horizontal slide rail with holder, conflict mechanism and the controller that orders about the outer gusset of gage outfit conflict bearing ferrule blanks.
2. the cold rolling measure and control device of bearing ferrule blanks according to claim 1 is characterized in that: described conflict mechanism comprises the connecting rod hinged with sliding seat, axis and laterally slide rail oil cylinder parallel and that be fixedly connected with holder, universal joint or floating junction; The cylinder bar of oil cylinder is connected with connecting rod by universal joint or floating junction.
3. the cold rolling measure and control device of bearing ferrule blanks according to claim 1 is characterized in that: described conflict mechanism comprises that the two ends of the first stage clip, the fixed block that is fixedly connected with sliding seat, the backstop that is fixedly connected with holder, the first stage clip push down respectively fixed block and backstop.
4. the cold rolling measure and control device of bearing ferrule blanks according to claim 1 is characterized in that: the fixed block that described conflict mechanism comprises extension spring, be fixedly connected with sliding seat, the positive stop that is fixedly connected with holder, the two ends of extension spring are connected with fixed block with positive stop respectively.
5. it is characterized in that according to claim 1 and 2 or the cold rolling measure and control device of 3 or 4 described bearing ferrule blanks: first displacement transducer or the grating scale of described controller for being fixedly connected with holder; The axis of the first measuring staff of the first displacement transducer is parallel with horizontal slide rail and be fixedly connected with sliding seat with an end of sliding seat grating gauge head relative or grating scale.
6. it is characterized in that according to claim 1 and 2 or the cold rolling measure and control device of 3 or 4 described bearing ferrule blanks: described gage outfit comprises the pinch roller that the other end of fixed bar that an end is fixedly connected with sliding seat, at least one and fixed bar articulates; During cold rolling, the outer gusset of the front side conflict bearing ferrule blanks of the outer gusset of pinch roller.
7. it is characterized in that according to claim 1 and 2 or the cold rolling measure and control device of 3 or 4 described bearing ferrule blanks: described gage outfit comprises fixed bar that an end and sliding seat be fixedly connected with, axis and laterally slide rail second displacement sensor parallel and that be fixedly connected with fixed bar, two pinch rollers, slide block, cover plate and the second stage clips; Fixed bar is provided with chute parallel with horizontal slide rail and that connect with the rear side of fixed bar; Slide block and the second stage clip are positioned at chute successively, and cover plate is pushed down the second stage clip and is fixedly connected with the rear side of fixed bar; The front end of the second measuring staff of second displacement sensor passes the rear end of cover plate and stage clip and slide block and conflicts; Pinch roller and fixed bar articulate; Another pinch roller and slide block articulate; During cold rolling, the outer gusset of the front side conflict bearing ferrule blanks of the outer gusset of two pinch rollers.
8. the cold rolling measure and control device of bearing ferrule blanks according to claim 7, it is characterized in that: described two pinch rollers are distributed in the both sides by the plane of the axis of the axis of the short cylindrical roll milling wheel of the cold rolling device of bearing ring and short cylindrical core roller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310272174.9A CN103357798B (en) | 2013-06-28 | 2013-06-28 | Cold rolling measuring and controlling device for workblank of bearing ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310272174.9A CN103357798B (en) | 2013-06-28 | 2013-06-28 | Cold rolling measuring and controlling device for workblank of bearing ring |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103357798A true CN103357798A (en) | 2013-10-23 |
| CN103357798B CN103357798B (en) | 2015-04-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310272174.9A Expired - Fee Related CN103357798B (en) | 2013-06-28 | 2013-06-28 | Cold rolling measuring and controlling device for workblank of bearing ring |
Country Status (1)
| Country | Link |
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| CN (1) | CN103357798B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104174661A (en) * | 2014-08-08 | 2014-12-03 | 中国重型机械研究院股份公司 | On-line measuring mechanical device and measuring method for outer diameter of rolled ring piece |
| CN105478638A (en) * | 2015-11-26 | 2016-04-13 | 芜湖天金机械有限公司 | Cold-rolling molding method for ball pin holder of constant velocity universal joint |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4405373A1 (en) * | 1994-02-19 | 1995-08-24 | Bad Dueben Profilwalzmaschinen | Cold rolling machine for e.g. ball and roller bearing rings |
| CN1853821A (en) * | 2005-04-18 | 2006-11-01 | 煤炭科学研究总院上海分院 | Roundness-roller controller of cold-rolling mill |
| CN2933648Y (en) * | 2006-07-18 | 2007-08-15 | 武汉理工大学 | Precision cold rolling mill ring machine |
| CN202606757U (en) * | 2012-05-24 | 2012-12-19 | 苏州中浦冷辗科技有限公司 | Cold rolling machine tool |
| CN203390132U (en) * | 2013-06-28 | 2014-01-15 | 宁波雄狮机械制造有限公司 | Cold rolling measurement and control device for bearing ring blank |
-
2013
- 2013-06-28 CN CN201310272174.9A patent/CN103357798B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4405373A1 (en) * | 1994-02-19 | 1995-08-24 | Bad Dueben Profilwalzmaschinen | Cold rolling machine for e.g. ball and roller bearing rings |
| CN1853821A (en) * | 2005-04-18 | 2006-11-01 | 煤炭科学研究总院上海分院 | Roundness-roller controller of cold-rolling mill |
| CN2933648Y (en) * | 2006-07-18 | 2007-08-15 | 武汉理工大学 | Precision cold rolling mill ring machine |
| CN202606757U (en) * | 2012-05-24 | 2012-12-19 | 苏州中浦冷辗科技有限公司 | Cold rolling machine tool |
| CN203390132U (en) * | 2013-06-28 | 2014-01-15 | 宁波雄狮机械制造有限公司 | Cold rolling measurement and control device for bearing ring blank |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104174661A (en) * | 2014-08-08 | 2014-12-03 | 中国重型机械研究院股份公司 | On-line measuring mechanical device and measuring method for outer diameter of rolled ring piece |
| CN104174661B (en) * | 2014-08-08 | 2016-02-03 | 中国重型机械研究院股份公司 | A kind of rolling ring external diameter on-line measurement mechanical device and measuring method |
| CN105478638A (en) * | 2015-11-26 | 2016-04-13 | 芜湖天金机械有限公司 | Cold-rolling molding method for ball pin holder of constant velocity universal joint |
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| CN103357798B (en) | 2015-04-08 |
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