CN106623742B - A kind of efficient automobile hollow out front axle forging method - Google Patents
A kind of efficient automobile hollow out front axle forging method Download PDFInfo
- Publication number
- CN106623742B CN106623742B CN201610431733.XA CN201610431733A CN106623742B CN 106623742 B CN106623742 B CN 106623742B CN 201610431733 A CN201610431733 A CN 201610431733A CN 106623742 B CN106623742 B CN 106623742B
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- upsetting
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- 238000005242 forging Methods 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 24
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 55
- 239000010959 steel Substances 0.000 claims abstract description 55
- 238000012937 correction Methods 0.000 claims abstract description 35
- 238000009966 trimming Methods 0.000 claims abstract description 24
- 238000004080 punching Methods 0.000 claims abstract description 22
- 238000005452 bending Methods 0.000 claims abstract description 10
- 150000001875 compounds Chemical class 0.000 claims abstract description 8
- 238000010080 roll forging Methods 0.000 claims abstract description 5
- 241000219112 Cucumis Species 0.000 claims description 22
- 235000015510 Cucumis melo subsp melo Nutrition 0.000 claims description 22
- FJJCIZWZNKZHII-UHFFFAOYSA-N [4,6-bis(cyanoamino)-1,3,5-triazin-2-yl]cyanamide Chemical compound N#CNC1=NC(NC#N)=NC(NC#N)=N1 FJJCIZWZNKZHII-UHFFFAOYSA-N 0.000 claims description 22
- 208000010727 head pressing Diseases 0.000 claims description 15
- 238000003825 pressing Methods 0.000 claims description 12
- 238000013461 design Methods 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 239000007787 solid Substances 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 2
- 238000003754 machining Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 3
- 210000001161 mammalian embryo Anatomy 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 208000020442 loss of weight Diseases 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/06—Making machine elements axles or shafts
- B21K1/12—Making machine elements axles or shafts of specially-shaped cross-section
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/02—Dies or mountings therefor
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The title of the present invention is a kind of efficient hollow out automobile front shaft forging method.Belong to automobile front axle manufacturing technology field.It is characterized by comprising following processing steps：(1) use forging roll that will heat round steel roller forging sheet stamping；(2) use 500T forcing presses roll forging base is bent in bending die be made before axis blank；(3) preceding axis blank is carried out in pre- finish-forging die cavity to be forged into front axle finish-forging base using electric screw press；(4) the flat correction of upsetting is carried out after using 2000T hydraulic presses that the overlap on preceding forging shaft periphery is carried out hot trimming in the flat correcting combined die of trimming upsetting；(5) 500T forcing presses is used to be punched out correction in punching correction compound die tool.Independent process, the flat correction combination process of trimming upsetting, punching correction combination process are mainly formed by press-bending to improve front axle solid forging speed, improve front axle fatigue life, reduce equipment and mold input, save the cost of charp tool, personnel waste, stock utilization is high, is suitble to produce automobile front axle in enormous quantities.
Description
Technical field
The invention belongs to automobile front shaft forging technology fields.More particularly to a kind of efficient forging of automobile hollow out front axle
Process is made, correction, punching correction etc. are put down by heating, roller forging sheet stamping, press-bending, hot trimming upsetting in hollow out front axle forging process
Combination process improves forging production efficiency, reduces steel plate position amount of machining, mitigates front axle weight, improves front axle service life.
Background technology
Front axle is the important safety part of automobile chassis system, and the production of front axle mostly uses the production technology or roller of hot forging
Die forging combination process.By taking roller die forges combination process as an example, front axle forging technology flow：Round steel heating → roller forging sheet stamping → press-bending,
Blocking, finish-forging → hot trimming → thermal recalibration.Preceding forging shaft basic forming after bending pre- finish-forging, in traditional front axle forging technology
For the ease of the molding of steel plate parallactic angle, inside and outside draft angle is devised convenient for draft, outer draft angle is generally 3 degree, interior draft angle one
As be 7 degree.Front axle both ends after trimming can be with the punching press and modification of core model in trimming, melon head center, steel plate position this moment
Not point-blank, i.e. front axle center line skew.Last procedure is thermal recalibration because the cavity of hot straightening mold be by
According to the appropriate Enlargement Design in preceding forging shaft part, so hot straightening mold ensure that the center line of front axle.General front axle is producing
When, there is the machining allowance of 6-8mm at the outer draft in steel plate position front, have 6-10mm allowance at interior draft, causes personnel, sets
The waste of standby, cutter, material.The front axle allowance of the technique productions is big, blank is laid particular stress on, forging disalignment amount is big, with
The preceding forging shaft lightweight energy-saving material-saving development trend that country advocates is not inconsistent.
Invention content
The purpose of the present invention provides a kind of forging method of efficient automobile hollow out front axle aiming at above-mentioned shortcoming
Instead of traditional front axle forging technology, the machining allowance of 8mm and 10mm at the inside and outside draft in steel plate position is reduced, reaches and exempts to process shape
State, mitigate front axle weight, improve front axle total quality, improve front axle production efficiency, avoid personnel, equipment, cutter, material wave
Take, the method for being suitble to high-volume efficiently to produce automobile front axle.
Technical solution of the invention is：A kind of efficient automobile hollow out front axle forging method, it is characterised in that including
Following processing step：
(1) use forging roll that will heat round steel roller forging sheet stamping；
(2) use 500T forcing presses roll forging base is bent in bending die be made before axis blank；
(3) preceding axis blank is carried out in pre- finish-forging die cavity to be forged into front axle finish-forging base using electric screw press；
(4) use 2000T hydraulic presses to carry out the overlap on preceding forging shaft periphery in the flat correcting combined die of trimming upsetting fervent
The flat correction of upsetting is carried out behind side；
(5) 500T forcing presses is used to be punched out correction in punching correction compound die tool.
Punch described in technical solution of the invention is 1-5, is determined according to the hollow out number of automobile front axle.
The angle of inclination of melon head pressing plate described in technical solution of the invention and automobile front axle melon head tilt angle
Unanimously.
Bearing piece is mounted on a left side by attaching nut and positioning key under steel plate position described in technical solution of the invention
Replaceable on right straightening die, left straightening die is connect with push oil cylinder.
The present invention the（2）Press-bending in step is independent process, and equipment uses 500T forcing presses, reduces equipment investment,
Solid forging production efficiency is improved, is improved to 34/hour by 28/hour.
The present invention the（4）Front axle trimming upsetting in step, which is put down, to be corrected using a set of flat correcting combined die of trimming upsetting,
Equipment is 2000T forcing presses, and the flat correcting combined die of trimming upsetting includes the first upper die holder, the first lower die holder, core model in trimming, is cut
Bearing piece, taper pin device, left correction under the side edge of a knife, material-pulling device, two steel plate position pressing plates, two melon head pressing plates, four steel plate positions
Mould, mobile guide block, guide rail, splicing holder, pushes other auxiliary accessories such as oil cylinder at right straightening die；Wherein, core model is fixed in trimming
On the first upper die holder, the trimming edge of a knife is fixed on by support plate on the first lower die holder, and there are certain altitudes below the edge of a knife
Blanking space facilitates material-pulling device that the front axle fallen is pushed on splicing holder, and material-pulling device can be not fixed on mold, steel
Plate position pressing plate and melon head pressing plate are fixed on the first upper die holder, and bearing piece is separately fixed at left and right by shape of product under four steel plate positions
On straightening die；Taper pin device is fixed on the first upper die holder；Right straightening die is fixed on lower die holder, and left straightening die is fixed on movement
On guide block, mobile guide block is connect with oil cylinder is pushed, and guide rail is fixed on the first lower die holder, and mobile guide block coordinates with guide rail；It pushes
Oil cylinder pushing moves guide block, drives left straightening die movement to form closed state with right straightening die by guide rail and constitutes correction station,
First upper die holder pushes, and drives under steel plate position pressing plate, melon head pressing plate, taper pin device and left and right straightening die, steel plate position bearing piece and preceding
Axis constitutes the flat correction station of upsetting, and taper pin device contacts more and more closer with left straightening die during pushing, makes during upsetting is flat
The close obvolvent of left and right straightening die；Bearing piece and two steel plate position clamp surface shapes and the inside and outside draft in steel plate position under four steel plate positions
Upsetting flat design size in angle is consistent；Melon head pressing plate angle is consistent with front axle melon brilliance degree.Automobile front axle steel plate position top and bottom after upsetting is flat
For plane, exempt to machine.Upsetting is flat using upsetting mode is embraced, and left and right straightening die cavity is consistent with automobile front axle shape.
The present invention the（5）Front axle punching correction in step is had using a set of punching correction compound die, and hollow out front axle is made
Forging.Equipment is 500T forcing presses；Punching correction compound die tool includes the second upper mold, the second lower die, punch, punch die holder, bullet
Spring；Wherein, punch is fixed on the punch die holder of 500T forcing presses；Spring is located at the second upper mold and punching loaded on spring guide pillar
Between head mould seat, the second upper mold, the second lower die and spring constitute punching correction station.
The present invention has advanced and creativeness, shows：
1. front axle is designed using hollow out loss of weight, mitigate automobile front axle weight.
2. press-bending operation configures Special purpose pressing machine, solid forging beat is promoted, 34/hour are promoted to by 28/hour.
3. carrying out hot trimming, the gentle centreline correction of steel plate position upsetting to front axle using 2000T hydraulic presses, reduces equipment and throw
Enter（20%）, save die cost（40%）, mitigate forge weight（8%）, save the cost of charp tool（40%）, reduce cost of labor
（20%）.
4. punching correction compound die has, reduces mold and equipment investment, mitigates forge weight.
Description of the drawings
Fig. 1 is hollow out（2 holes）Front axle schematic diagram.
Fig. 2 is hollow out（3 holes）Front axle schematic diagram.
Fig. 3 is hollow out（5 holes）Front axle schematic diagram.
Fig. 4 is traditional front axle steel plate position schematic diagram.
Fig. 5,6 are the flat correcting combined die schematic cross-section of trimming upsetting.
Fig. 7 is that punching correction compound die has schematic cross-section.
Fig. 8 is front axle steel plate position schematic cross-section after upsetting is flat.
Illustrate number parts title：1. splicing holder, 2. push oil cylinders, 3. left straightening dies, 4. right straightening dies, 5. steel plates
Position lower bearing piece, 6. taper pins, 7. steel plate position pressing plates, 8. melon head pressing plates, 9. material-pulling devices, 10. upper molds, 11. lower dies, 12. punch moulds
Seat, 13. punches, 14. springs, 15. spring guide pillars.
Specific implementation mode
Specific implementation mode is described in detail below in conjunction with the accompanying drawings.
Fig. 1 to Fig. 3 is respectively the front axle schematic diagram in 2 hole of hollow out, 3 holes and 5 holes.The form of front axle hollow out can be " O " type
Hole can also be rectangular opening, can also be irregular hole etc..The shape of these hollow outs and position depend primarily on front axle by
Depending on power situation, this method is suitable for the hollow out front axle of form of ownership.
The forging method of the efficient hollow out automobile front axle of the present invention comprises the following steps that.
(1) by round steel after intermediate-frequency heating furnace is heated to 1100-1250 DEG C, round steel roll forging embryo will be heated with forging roll.
(2) the straight embryo of roll forging is bent to axis blank before being made using 500T forcing presses in bending die.
Use 16000T electric screw press in pre- finish-forging die cavity by preceding axis blank carry out forging be made before
Axis finish-forging embryo.
(4) use 2000T hydraulic presses to carry out the overlap on preceding forging shaft periphery in the flat correcting combined die of trimming upsetting fervent
The flat correction of upsetting is carried out behind side；The flat correcting combined die of trimming upsetting includes the first upper die holder, the first lower die holder, two steel plate position pressing plates
7, bearing piece 5 under two melon head pressing plates, 8, four steel plate positions, taper pin device 6, left straightening die 3, right straightening die 4, mobile guide block, lead
Rail, pushes oil cylinder 2 at splicing holder 1, as shown in Figure 5, Figure 6；Wherein, steel plate position pressing plate 7 and melon head pressing plate 8, taper pin device 6 are solid
It is scheduled on the first upper die holder, splicing holder 1 is mounted on the first lower die holder, is located among left straightening die 3 and right straightening die 4, steel
Bearing piece 5 is separately fixed on left straightening die 3 and right straightening die 4 under plate position；Right straightening die 4 is fixed on the first lower die holder, left school
Holotype 3 is connected on mobile guide block, and mobile guide block is connect with oil cylinder 2 is pushed, and guide rail is fixed on the first lower die holder, mobile guide block
Coordinate with guide rail；It pushes oil cylinder 2 to push mobile guide block, drives the movement of left straightening die 3 to be formed with right straightening die 4 by guide rail and be closed
State constitutes correction station, and the first upper die holder pushes, and steel plate position pressing plate 7, melon head pressing plate 8, taper pin device 6 and left and right is driven to correct
Bearing piece 5 and front axle constitute the flat correction station of upsetting under mould, steel plate position, and taper pin device 6 contacts more next with left straightening die 3 during pushing
It is closer, make the obvolvent always during upsetting is flat of left straightening die 3 and right straightening die 4；Bearing piece 5 and two steel plates under four steel plate positions
Position 7 surface shape of pressing plate is consistent with the inside and outside flat design size of draft angle upsetting in steel plate position；8 angle of melon head pressing plate and the front axle melon brilliance
Degree is consistent, prevents the upsetting of steel plate position from usually lifting on front axle stress melon head.Forging is finally transferred to lower road sequence by manipulator.
Draft angle can intuitively find out the difference of the flat front and back processing capacity of upsetting by Fig. 4 and Fig. 8 inside and outside at front axle steel plate position.
Traditional front axle steel plate position is as shown in Figure 4.The ruler that part at the front of steel plate position more than " size 17 " requires machining for
Very little, machining needs two knives to complete milling flat, and " size 17 " is with down toward " size at the back side of steel plate position（62）" it is similar to triangle
Region be to need mach part, one knife of unilateral needs is completed, and totally four knives are completed.
Front axle steel plate position section is as shown in Figure 8 after pier of the present invention is flat.Opposite prior art can reduce the inside and outside draft in steel plate position
Locate the machining allowance of 8mm and 10mm.
(5) punching correction is carried out on punching correction mould using 500T forcing presses, forging shaft before hollow out is made；Punching correction
Composite die includes the second upper mold 10, the second lower die 11, punch die holder 12, punch 13, spring 14, spring guide pillar 15, such as Fig. 7 institutes
Show；Wherein, punch 13 is fixed on the punch die holder 12 of 500T forcing presses；Spring 14 is located at second loaded on spring guide pillar 15
Between upper mold 10 and punch die holder 12, the second upper mold 10, the second lower die 11 and spring 14 constitute punching correction station.When punching
By front axle obvolvent in cavity, punch die holder 12 drives punch 13 to continue to push and is punched out for two upper molds 10 and the second lower die 11,
Wherein punch 13 passes through the second upper mold 10, the second upper mold 10 to coordinate by spring 14 and spring guide pillar 15 with punch die holder 12, stay
There is certain volume under pressure, when punching back punching head 12 uplink of die holder separates punch 13 and front axle by spring 14.
The invention has the characteristics that：（1）All hollow out front axle models are adapted to, automobile front axle weight is mitigated；（2）It improves whole
Body Forging Equipment Speed；（3）Forging's block dimension precision improves；（4）The forging for completing complicated front axle is put into a small amount of equipment and mold；
（5）The upsetting of steel plate position is flat to reduce forging machine dosage, saves the cost of charp tool.
Claims (4)
1. a kind of efficient automobile hollow out front axle forging method, it is characterised in that comprise the following steps that：
(1) use forging roll that will heat round steel roller forging sheet stamping；
(2) use 500T forcing presses roll forging base is bent in bending die be made before axis blank；
(3) preceding axis blank is carried out in pre- finish-forging die cavity to be forged into front axle finish-forging base using electric screw press；
(4) after using 2000T hydraulic presses that the overlap on preceding forging shaft periphery is carried out hot trimming in the flat correcting combined die of trimming upsetting
Carry out the flat correction of upsetting；The flat correcting combined die of trimming upsetting includes core model, edge-trimming cutter in the first upper die holder, the first lower die holder, trimming
Bearing piece, taper pin device, left straightening die, the right side under mouth, material-pulling device, two steel plate position pressing plates, two melon head pressing plates, four steel plate positions
Straightening die, mobile guide block, guide rail, splicing holder and promotion oil cylinder；Wherein, core model is fixed on the first upper die holder in trimming, is cut
The side edge of a knife is fixed on by support plate on the first lower die holder, and there are blanking spaces below the edge of a knife, and material-pulling device is before falling
Axis pushes to splicing holder, and splicing holder is mounted on the first lower die holder, is located among left straightening die and right straightening die, steel plate position
Pressing plate and melon head pressing plate are fixed on the first upper die holder, and bearing piece is separately fixed at left and right correction by shape of product under four steel plate positions
On mould；Taper pin device is fixed on the first upper die holder；Right straightening die is fixed on lower die holder, and left straightening die is fixed on mobile guide block
On, mobile guide block is connect with oil cylinder is pushed, and guide rail is fixed on the first lower die holder, and mobile guide block coordinates with guide rail；Push oil cylinder
Movement guide block is pushed, drives left straightening die movement to be constituted with right straightening die formation closed state by guide rail and corrects station, first
Upper die holder pushes, bearing piece and front axle structure under drive steel plate position pressing plate, melon head pressing plate, taper pin device and left and right straightening die, steel plate position
At the flat correction station of upsetting, taper pin device contacts more and more closer with left straightening die during pushing, makes left straightening die and right correction
Mould obvolvent always during upsetting is flat；Bearing piece and two steel plate position clamp surface shapes and steel plate position are inside and outside under four steel plate positions
The flat design size of draft angle upsetting is consistent；Melon head pressing plate angle is consistent with front axle melon brilliance degree；After upsetting is flat on automobile front axle steel plate position
It is below plane, exempts to machine；Upsetting is flat using upsetting mode is embraced, and left and right straightening die cavity is consistent with automobile front axle shape；
(5) 500T forcing presses is used to be punched out correction in punching correction compound die tool；Punching correction compound die tool includes second
Upper mold, the second lower die, punch, punch die holder, spring；Wherein, punch is fixed on the punch die holder of 500T forcing presses；Spring fills
In on spring guide pillar, between the second upper mold and punch die holder, the second upper mold, the second lower die and spring constitute punching correction work
Position；Second upper mold and the second lower die are by front axle obvolvent in cavity, and punch die holder drives punch to continue to push and is punched out, punch
Across the second upper mold, the second upper mold is coordinated with punch die holder by spring and spring guide pillar, and there are certain volumes under pressure.
2. a kind of efficient automobile hollow out front axle forging method according to claim 1, it is characterised in that：The punch
It is 1-5.
3. a kind of efficient automobile hollow out front axle forging method according to claim 1 or 2, it is characterised in that：Described
The angle of inclination of melon head pressing plate is consistent with automobile front axle melon head tilt angle.
4. a kind of efficient automobile hollow out front axle forging method according to claim 1 or 2, it is characterised in that：Described
Bearing piece is mounted on by attaching nut and positioning key on the straightening die of left and right under steel plate position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610431733.XA CN106623742B (en) | 2016-06-17 | 2016-06-17 | A kind of efficient automobile hollow out front axle forging method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610431733.XA CN106623742B (en) | 2016-06-17 | 2016-06-17 | A kind of efficient automobile hollow out front axle forging method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106623742A CN106623742A (en) | 2017-05-10 |
| CN106623742B true CN106623742B (en) | 2018-11-06 |
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| CN201610431733.XA Active CN106623742B (en) | 2016-06-17 | 2016-06-17 | A kind of efficient automobile hollow out front axle forging method |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107282840A (en) * | 2017-06-21 | 2017-10-24 | 桂林福达重工锻造有限公司 | It is a kind of to realize the mould of preceding forging shaft trimming and two-way finishing shape |
| CN111590004B (en) * | 2020-05-26 | 2022-01-11 | 江苏龙城精锻集团有限公司 | Manufacturing process for manufacturing integral stainless steel oil rail forging |
| CN111687604A (en) * | 2020-06-19 | 2020-09-22 | 山西中晋工业机械有限公司 | Manufacturing process of front axle |
| CN115213330B (en) * | 2022-06-23 | 2024-12-06 | 中国第一汽车股份有限公司 | A small flash forging process for commercial vehicle front axle |
| CN115921737B (en) * | 2022-12-08 | 2025-07-08 | 庆铃汽车（集团）有限公司 | Forging forming process for near-net forming front shaft forging by using full flow line |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55144347A (en) * | 1979-04-26 | 1980-11-11 | Daido Steel Co Ltd | Flattening method of seat part of front axle center and its device |
| GB2094195B (en) * | 1981-02-24 | 1984-08-22 | Scottish Stamping & Engineerin | Forging heavy articles |
| CN201529706U (en) * | 2009-11-24 | 2010-07-21 | 中国重汽集团济南动力有限公司 | Heavy truck bending beam plastic mold |
| CN201613328U (en) * | 2010-03-19 | 2010-10-27 | 重庆杰信模具有限公司 | Finishing mould for automotive front axle |
| CN201823863U (en) * | 2010-09-29 | 2011-05-11 | 曾奇夫 | Valve body die for four-hole valves |
| CN102189181B (en) * | 2011-04-07 | 2012-10-24 | 湖南中沃汽车零部件制造有限公司 | Bidirectional thermal correction mould for front axle of heavy-duty car |
| CN203221173U (en) * | 2013-03-11 | 2013-10-02 | 江苏省泰盛石化管件有限公司 | Linkage separating and combining type thermoplastic precision forging mould |
| CN103331333B (en) * | 2013-07-16 | 2015-10-28 | 山东恒泰车桥有限公司 | A kind of front axle means for correcting and front axle correction process |
| CN104801573A (en) * | 2014-01-27 | 2015-07-29 | 中国重汽集团济南动力有限公司 | Front axle combined bidirectional correction method and device |
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2016
- 2016-06-17 CN CN201610431733.XA patent/CN106623742B/en active Active
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| CN106623742A (en) | 2017-05-10 |
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