CN103659308A - Processing clamp for differential spider - Google Patents

Processing clamp for differential spider Download PDF

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Publication number
CN103659308A
CN103659308A CN201210327602.9A CN201210327602A CN103659308A CN 103659308 A CN103659308 A CN 103659308A CN 201210327602 A CN201210327602 A CN 201210327602A CN 103659308 A CN103659308 A CN 103659308A
Authority
CN
China
Prior art keywords
differential spider
core axle
locating piece
locating
hole
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
Application number
CN201210327602.9A
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Chinese (zh)
Other versions
CN103659308B (en
Inventor
袁国庆
陈兴军
高永峰
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.)
Wanxiang Qianchao Co Ltd
Wanxiang Group Corp
Original Assignee
Wanxiang Qianchao Co Ltd
Wanxiang Group Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wanxiang Qianchao Co Ltd, Wanxiang Group Corp filed Critical Wanxiang Qianchao Co Ltd
Priority to CN201210327602.9A priority Critical patent/CN103659308B/en
Publication of CN103659308A publication Critical patent/CN103659308A/en
Application granted granted Critical
Publication of CN103659308B publication Critical patent/CN103659308B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23QDETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q3/00Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
    • B23Q3/02Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
    • B23Q3/06Work-clamping means
    • B23Q3/062Work-clamping means adapted for holding workpieces having a special form or being made from a special material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23QDETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q3/00Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
    • B23Q3/02Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
    • B23Q3/06Work-clamping means
    • B23Q3/08Work-clamping means other than mechanically-actuated
    • B23Q3/082Work-clamping means other than mechanically-actuated hydraulically actuated

Abstract

The invention discloses a processing clamp for a differential spider. The processing clamp comprises a base. The base is provided with a locating block, a center shaft fixedly connected with the base is arranged at the lower end of the locating block, a core shaft hole is formed in the center of the upper end of the locating block, the lower end of a locating core shaft is matched in the core shaft hole in a sliding mode, a spring seat hole is formed in the center of the lower end of the locating core shaft, and a compression spring is matched in the center of the lower end of the locating core shaft. The other end of the compression spring abuts against the bottom of the core shaft hole. A sunken groove is formed in the outer side surface of the lower end of the locating core shaft. A limiting bolt is fixed to the outer side surface of the locating block, and the head of the limiting bolt is matched with the sunken groove. The upper end of the locating core shaft is of a cylindrical structure. A sunken hole is formed in the portion, close to the peripheral area, of the outer end surface of the locating block, a clamping pin is matched in the sunken hole, and the circumferential clamping pin is locked through a fastening screw arranged on the side wall of the locating block. A pressing device for the differential spider is correspondingly arranged above the locating block. According to the processing clamp, the processing space of the differential spider is not limited, four journals can be processed through clamping at a time, so that the work efficiency is improved, the number of times of standard change is reduced, and the locating accuracy is improved.

Description

Differential spider clamp for machining
Technical field
The invention belongs to clamp technology field, be specifically related to a kind of for processing the fixture of differential spider.
Background technology
The machining accuracy of differential spider is directly connected to transmission accuracy and the service life of star coupling, the Design and manufacture level of its machining accuracy and fixture is closely related, prior art need be passed through three process mostly, first adopt V-type locating piece with the outer neck of four axle journal blanks location end face milling drill centers, with top centre bore and end face, the spike pulling anti-skidding finish turning axle journal on numerically controlled lathe of withstanding, this needs manual auxiliary conversion four direction again; Because position degree and perpendicularity deviation are all larger when end face milling and drill centers, need to increase correcting process to be calibrated to the requirement of drawing regulation.
For example Chinese Patent Application No. is 201110067933.9, name is called the application for a patent for invention of " Universal joint pin machining fixture ", a kind of Universal joint pin machining fixture is disclosed, it comprises support body, hold-down devices, center positioning device, upper rotary table plate, axle journal fixture, integrated locating device and stationary platen, hold-down devices is connected to support body top, stationary platen is connected to support body bottom, center positioning device is vertically connected on the central authorities of stationary platen, upper rotary table plate is enclosed within on center positioning device, with the embedding of stationary platen phase, axle journal fixture is arranged on rotary table plate.This Universal joint pin machining fixture vertically arranges a center positioning device on stationary platen, and rotary table plate is set on center positioning device, upper rotary table plate and the embedding of stationary platen phase, and then axle journal fixture is set on upper rotary table plate; Its axle journal fixture application V font cushion block, therefore after clamping, just can only process axle journal end face, and the neck external diameter of finish turning axle journal simultaneously, four axle journals need increase No. four clampings and just can complete the processing of end face and axle journal, not only there is the low deficiency of the loaded down with trivial details work efficiency of operation, also exist because convert positioning datum and repeat clamping and make the uneven defect that produces error of clamping force.
Summary of the invention
The technical issues that need to address of the present invention are, the Universal joint pin machining fixture that overcomes prior art cannot adapt to the defect of differential spider blank axle journal neck external diameter processing, and the finish turning that a kind of clamped one time can complete four axle journals simultaneously, the differential spider clamping device of splitting the processing of end face, drill centers, chamfering, circular arc are provided.
The object of the invention is to be achieved by following technical proposals: a kind of differential spider clamp for machining, comprise base, on base, be provided with locating piece, the lower end of locating piece is provided with the central shaft being fixedly connected with base, the centre, upper end of locating piece is provided with core axle hole, the lower end of positioning core axle fits in core axle hole slidably, the centre of positioning core axle lower end is provided with spring base hole, in spring base hole, is furnished with Compress Spring, the other end of Compress Spring withstands on core axle hole bottom, the lateral surface of positioning core axle lower end is provided with deep gouge, locating piece lateral surface is fixed with stop screw, the head of stop screw coordinates with deep gouge, the upper end of positioning core axle is the cylindrical structural with differential spider centre bore adaptation, the upper surface of locating piece is provided with counterbore near periphery position, is furnished with the circumferential holding pin of differential spider in counterbore, and circumferentially holding pin locks by being located at the trip bolt of locating piece sidewall, the corresponding hold down gag that is provided with differential spider in locating piece top.
Locating piece lower end central shaft is firmly connected with lathe by base, positioning core axle and locating piece interference fits also can relatively move up and down, by Compress Spring, positioning core axle is made progress all the time, the traveled distance of controlling positioning core axle by being fixed on stop screw on locating piece is connected into one by the two simultaneously effectively; Trip bolt is fixed on holding pin on locating piece; The centre bore of differential spider is enclosed within to the upper end of positioning core axle, the periphery position lower surface of centre bore is pressed on the end face of holding pin, then hold down gag is pressed in to upper surface the locking at centre bore periphery position, can carries out finish turning to cross axle axle journal with that, split end face, the processing of drill centers, chamfering and circular arc.
as preferably, described central shaft is step structure, and its hypomere is cylinder, and epimere is cydariform cylinder, and the cylinder that cydariform cylinder is clipped dual-side by symmetry forms.
As preferably, the cylindrical structural periphery of positioning core axle upper end is provided with importing cone angle.
As preferably, hold down gag comprises the portal frame being fixedly connected with base, and the crossbeam of portal frame is every sky across above positioning core axle, and the middle part of crossbeam is provided with top-pressure mechanism, connection top, the lower end pressure head of top-pressure mechanism, and top pressure head is corresponding with positioning core axle.
As preferably, top-pressure mechanism consists of the oil cylinder that is connected to the crossbeam middle part of portal frame, and the piston rod of oil cylinder is connected with top pressure head.
As preferably, in the control loop of oil cylinder, be provided with hydraulic control one-way valve locking loop, described hydraulic control one-way valve locking loop comprises the three position four-way electromagnetic valve of being located in loop, the hydraulic control one-way valve being connected in series with the oil inlet pipe of oil cylinder, and import and control port that wherein the meta connected mode of three position four-way electromagnetic valve is hydraulic control one-way valve are communicated with fuel tank.
As preferably, top-pressure mechanism comprises the nut that is connected to portal frame crossbeam middle part, is furnished with screw rod in nut, and screw head is connected with top pressure head.
As preferably, hold down gag is provided with top pressure pad piece, and the top of top pressure pad piece is disc-shaped structure, and the bottom of top pressure pad piece is cylindric centering shaft part, the centre bore adaptation of centering shaft part and differential spider, and top pressure pad piece liner is below the pressure head of top.
As preferably, described counterbore bottom is provided with the bottom outlet connecting with locating piece bottom, and bottom diameter is less than counter bore hole diameters; Position corresponding with this bottom outlet on base is provided with the through hole that diameter is greater than this bottom diameter.
The invention has the beneficial effects as follows:
1, for differential spider centre bore periphery, clamp, can not cause the axle journal processing space of differential spider to be restricted;
2, clamped one time just can complete whole manufacturing procedures of four axle journals;
3, simplify technique, improve work efficiency;
4, significantly reduce transformation of criterion number of times, improve positioning precision.
Accompanying drawing explanation
Fig. 1 is the structural representation of an embodiment of the present invention;
Fig. 2 is the locating piece schematic diagram of a kind of embodiment;
Fig. 3 is the E-E generalized section of Fig. 2;
Fig. 4 is the structural representation that oil cylinder and top pressure head are set on portal frame;
Fig. 5 is hydraulic control one-way valve locking oil cylinder principle schematic.
In figure, base 1; Locating piece 2; Central shaft 21; Cylinder 211; Cydariform cylinder 212; Screw 213; Core axle hole 22; Counterbore 23; Trip bolt 24; Positioning core axle 3; Spring base hole 31; Deep gouge 32; Compress Spring 4; Stop screw 5; Holding pin 6; Hold down gag 7; Portal frame 71; Crossbeam 711; Oil cylinder 712; Top pressure head 713; Three position four-way electromagnetic valve 714; Hydraulic control one-way valve 715; Fuel tank 716; Top pressure pad piece 8; Centering shaft part 81; Differential spider 9.
The specific embodiment
Below in conjunction with accompanying drawing and specific embodiments, the invention will be further described.
Embodiment 1: as Fig. 1, shown in Fig. 2, a kind of differential spider clamp for machining, comprise base 1, on base, be provided with locating piece 2, the lower end of locating piece 2 is provided with the central shaft 21 being fixedly connected with base 1, the centre, upper end of locating piece 2 is provided with core axle hole 22, the lower end of positioning core axle 3 fits in core axle hole 22 slidably, the centre of positioning core axle 3 lower ends is provided with spring base hole 31, in spring base hole 31, is furnished with Compress Spring 4, the other end of Compress Spring 4 withstands on the bottom of core axle hole 22, the lateral surface of positioning core axle 3 lower ends is provided with deep gouge 32, deep gouge 32 is annular groove, locating piece 2 lateral surfaces are fixed with stop screw 5, the head of stop screw 5 coordinates with deep gouge 32, the upper end of positioning core axle 3 is the cylindrical structural with differential spider 9 centre bore adaptations, the upper surface of locating piece 2 is provided with counterbore 23 near periphery position, is furnished with the circumferential holding pin 6 of differential spider 9 in counterbore 23, and holding pin 6 is by being located at trip bolt 24 lockings of locating piece 2 sidewalls, locating piece 2 top correspondences are provided with the hold down gag 7 of differential spider.
Locating piece 2 lower end central shafts are firmly connected with lathe by base 1, positioning core axle 3 also can relatively move up and down with locating piece 2 interference fits, by Compress Spring 4, positioning core axle 3 is made progress all the time, the traveled distance of controlling positioning core axle 3 by being fixed on stop screw 5 on locating piece 2 is connected into one by the two simultaneously effectively.Trip bolt 24 is fixed on holding pin 6 on locating piece 2; The centre bore of differential spider 9 is enclosed within to the upper end of positioning core axle 3, the periphery position lower surface of centre bore is pressed on the end face of holding pin 6, then hold down gag 7 is pressed in to upper surface the locking at centre bore periphery position, can carries out finish turning to differential spider axle journal with that, split end face, the processing of drill centers, chamfering and circular arc.
central shaft 21 is step structure, its hypomere is cylinder 211, epimere is cydariform cylinder 212, the cylinder that cydariform cylinder 212 is clipped dual-side by symmetry forms, cydariform cylinder 212 can prevent that locating piece 2 from rotating, and cylinder 211 bottoms once had centre bore man-hour adding, and when processing will complete, again centre bore were changed into screw 213, by this screw 213, locating piece 2 use screws can be hung tight on base 1, as shown in Figure 2 and Figure 3.
The cylindrical structural periphery of positioning core axle 3 upper ends is provided with importing cone angle, is enclosed within smoothly the upper end of positioning core axle to be convenient to the centre bore of differential spider.
Hold down gag 7 comprises the portal frame 71 being fixedly connected with base 1, the crossbeam 711 of portal frame 71 every sky across above positioning core axle 3, the middle part of crossbeam 711 is provided with top-pressure mechanism, top-pressure mechanism consists of the oil cylinder 712 that is connected to crossbeam 711 middle parts of portal frame 71, the piston rod of oil cylinder 712 is connected with top pressure head 713, and top pressure head 713 is corresponding with positioning core axle 3, in the control loop of oil cylinder 712, be provided with hydraulic control one-way valve locking loop, hydraulic control one-way valve locking loop comprises the three position four-way electromagnetic valve 714 of being located in loop, the hydraulic control one-way valve 715 being connected in series with the oil inlet pipe of oil cylinder 712, wherein the meta connected mode of three position four-way electromagnetic valve 714 is that import and the control port of hydraulic control one-way valve 715 is communicated with fuel tank 716, when three position four-way electromagnetic valve 714 is during in meta, hydraulic control one-way valve 715 is closed rapidly, oil cylinder 712 epicoeles are by hydraulic control one-way valve 715 lockings, piston can not move upward, piston rod by top pressure head 713 down dieback to clamp differential spider 9, as Fig. 4, shown in Fig. 5.
When three position four-way electromagnetic valve 714 is controlled, in left when position, hydraulic control one-way valve 715 is open-minded, oil cylinder 712 epicoele oil-feeds, and cavity of resorption oil return simultaneously, piston promotes top pressure head 713 downwards and down clamps differential spider 9; When three position four-way electromagnetic valve 714 is in right when position, hydraulic control one-way valve 715 is subject to hydraulic control and open-minded, oil cylinder 712 cavity of resorption oil-feeds, and epicoele is through hydraulic control one-way valve 715 oil returns simultaneously, and piston upwards draws top pressure head 713 and up moves and unclamp differential spider 9.
Hold down gag is provided with top pressure pad piece 8, and the top of top pressure pad piece 8 is disc-shaped structure, and the bottom of top pressure pad piece 8 is cylindric centering shaft part 81, and centering shaft part 81 is adaptive with the centre bore of differential spider 9, and top pressure pad piece 8 liners are below top pressure head 713; The centre bore height that the length of deep gouge 32 is less than or equal to differential spider 9 deducts the centering shaft part 81 height sums of stop screw 5 head diameters and top pressure pad piece 8.
Counterbore 23 bottoms are provided with the bottom outlet connecting with locating piece 2 bottoms, and bottom diameter is less than counterbore 23 diameters, sets push rod in bottom outlet; Bottom outlet can be also screw and join screw, push rod or screw are used for rising holding pin 6, if holding pin 6 apical side height superelevation can be revolved low screw and be pressed holding pin 6 and adjusted, if holding pin 6 apical side heights are on the low side can be revolved high screw holding pin 6 is adjusted, then by trip bolt 24 lockings.
Embodiment 2: top-pressure mechanism comprises the nut that is connected to portal frame crossbeam middle part, are furnished with screw rod in nut, and screw head is connected with top pressure head, and nut and screw flight are trapezoidal or zigzag, and all the other structures are with embodiment 1.
The present invention can be as fixture application in various cross axle processing, there are whole manufacturing procedures that clamped one time just can complete four axle journals, simplify technique, improve work efficiency, reduce transformation of criterion number of times, improve the advantage of positioning precision, if those skilled in the art does simple modification or replacement to foregoing invention content, such change can not be thought to depart from the scope of the present invention, all like this to the apparent modification of those skilled in the art by within being included in the scope of claim of the present invention.

Claims (9)

1. a differential spider clamp for machining, comprise base, it is characterized in that, on base, be provided with locating piece, the lower end of locating piece is provided with the central shaft being fixedly connected with base, the centre, upper end of locating piece is provided with core axle hole, the lower end of positioning core axle fits in core axle hole slidably, the centre of positioning core axle lower end is provided with spring base hole, in spring base hole, is furnished with Compress Spring, the other end of Compress Spring withstands on core axle hole bottom, the lateral surface of positioning core axle lower end is provided with deep gouge, locating piece lateral surface is fixed with stop screw, the head of stop screw coordinates with deep gouge, the upper end of positioning core axle is the cylindrical structural with differential spider centre bore adaptation, the upper surface of locating piece is provided with counterbore near periphery position, is furnished with the circumferential holding pin of differential spider in counterbore, and circumferentially holding pin locks by being located at the trip bolt of locating piece sidewall, the corresponding hold down gag that is provided with differential spider in locating piece top.
2. differential spider clamp for machining according to claim 1, is characterized in that, described central shaft is step structure, and its hypomere is cylinder, and epimere is cydariform cylinder, and the cylinder that cydariform cylinder is clipped dual-side by symmetry forms.
3. differential spider clamp for machining according to claim 2, is characterized in that, the cylindrical structural periphery of positioning core axle upper end is provided with importing cone angle.
4. differential spider clamp for machining according to claim 3, it is characterized in that, hold down gag comprises the portal frame being fixedly connected with base, the crossbeam of portal frame every sky across above positioning core axle, the middle part of crossbeam is provided with top-pressure mechanism, connection top, the lower end pressure head of top-pressure mechanism, top pressure head is corresponding with positioning core axle.
5. differential spider clamp for machining according to claim 4, is characterized in that, top-pressure mechanism consists of the oil cylinder that is connected to the crossbeam middle part of portal frame, and the piston rod of oil cylinder is connected with top pressure head.
6. differential spider clamp for machining according to claim 5, it is characterized in that, in the control loop of oil cylinder, be provided with hydraulic control one-way valve locking loop, described hydraulic control one-way valve locking loop comprises the three position four-way electromagnetic valve of being located in loop, the hydraulic control one-way valve being connected in series with the oil inlet pipe of oil cylinder, and import and control port that wherein the meta connected mode of three position four-way electromagnetic valve is hydraulic control one-way valve are communicated with fuel tank.
7. differential spider clamp for machining according to claim 4, is characterized in that, top-pressure mechanism comprises the nut that is connected to portal frame crossbeam middle part, is furnished with screw rod in nut, and screw head is connected with top pressure head.
8. according to the differential spider clamp for machining described in claim 5 or 6 or 7, it is characterized in that, hold down gag is provided with top pressure pad piece, the top of top pressure pad piece is disc-shaped structure, the bottom of top pressure pad piece is cylindric centering shaft part, the centre bore of centering shaft part and differential spider is adaptive, and top pressure pad piece liner is below the pressure head of top.
9. differential spider clamp for machining according to claim 8, is characterized in that, described counterbore bottom is provided with the bottom outlet connecting with locating piece bottom, and bottom diameter is less than counter bore hole diameters; Position corresponding with this bottom outlet on base is provided with the through hole that diameter is greater than this bottom diameter.
CN201210327602.9A 2012-09-07 2012-09-07 Differential spider clamp for machining Active CN103659308B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201210327602.9A CN103659308B (en) 2012-09-07 2012-09-07 Differential spider clamp for machining

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201210327602.9A CN103659308B (en) 2012-09-07 2012-09-07 Differential spider clamp for machining

Publications (2)

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CN103659308A true CN103659308A (en) 2014-03-26
CN103659308B CN103659308B (en) 2016-04-13

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104972137A (en) * 2015-04-16 2015-10-14 江西省分宜驱动桥有限公司 Technology and device for improving machining precision of drive axle differential
CN109759857A (en) * 2017-11-09 2019-05-17 王海艳 Integral steering section forging technology with knuckle arm
CN109759861A (en) * 2017-11-09 2019-05-17 王海艳 A kind of flange forging technique

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001071224A (en) * 1999-09-03 2001-03-21 Okuma Corp Cross rail clamp device
US20080096746A1 (en) * 2006-10-19 2008-04-24 Shin Nippon Koki Co., Ltd. Machine tool
CN101537507A (en) * 2009-03-25 2009-09-23 杭州正强万向节有限公司 Cardan type universal joint automatic drilling device
CN201350562Y (en) * 2008-12-18 2009-11-25 北京南口轨道交通机械有限责任公司 Adjustable fixture for workpieces needing to be processed with cylindrical cross punched holes
CN102189425A (en) * 2011-03-22 2011-09-21 南车戚墅堰机车有限公司 Universal joint pin machining fixture
CN202367482U (en) * 2011-12-29 2012-08-08 重庆机床(集团)有限责任公司 Fastening device used for machining parts like universal joint pin
CN202763510U (en) * 2012-09-07 2013-03-06 万向钱潮股份有限公司 Differential spider machining fixture

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001071224A (en) * 1999-09-03 2001-03-21 Okuma Corp Cross rail clamp device
US20080096746A1 (en) * 2006-10-19 2008-04-24 Shin Nippon Koki Co., Ltd. Machine tool
CN201350562Y (en) * 2008-12-18 2009-11-25 北京南口轨道交通机械有限责任公司 Adjustable fixture for workpieces needing to be processed with cylindrical cross punched holes
CN101537507A (en) * 2009-03-25 2009-09-23 杭州正强万向节有限公司 Cardan type universal joint automatic drilling device
CN102189425A (en) * 2011-03-22 2011-09-21 南车戚墅堰机车有限公司 Universal joint pin machining fixture
CN202367482U (en) * 2011-12-29 2012-08-08 重庆机床(集团)有限责任公司 Fastening device used for machining parts like universal joint pin
CN202763510U (en) * 2012-09-07 2013-03-06 万向钱潮股份有限公司 Differential spider machining fixture

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104972137A (en) * 2015-04-16 2015-10-14 江西省分宜驱动桥有限公司 Technology and device for improving machining precision of drive axle differential
CN109759857A (en) * 2017-11-09 2019-05-17 王海艳 Integral steering section forging technology with knuckle arm
CN109759861A (en) * 2017-11-09 2019-05-17 王海艳 A kind of flange forging technique

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