CN107520394A - The technological equipment and method of crank throw are forged on double action hydraulic press - Google Patents
The technological equipment and method of crank throw are forged on double action hydraulic press Download PDFInfo
- Publication number
- CN107520394A CN107520394A CN201710682239.5A CN201710682239A CN107520394A CN 107520394 A CN107520394 A CN 107520394A CN 201710682239 A CN201710682239 A CN 201710682239A CN 107520394 A CN107520394 A CN 107520394A
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- CN
- China
- Prior art keywords
- hydraulic press
- double action
- crank throw
- shuttering
- action hydraulic
- 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.)
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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
- B21K1/08—Making machine elements axles or shafts crankshafts
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J9/00—Forging presses
- B21J9/10—Drives for forging presses
- B21J9/12—Drives for forging presses operated by hydraulic or liquid pressure
Abstract
The present invention discloses the technological equipment and method that crank throw is forged on a kind of double action hydraulic press, and its frock includes upper shuttering, U-shaped die cavity, template die cavity, lower shuttering.Its method is on double action hydraulic press, and the drift of vertical direction is first connected with compacting mould, and compacting process is carried out to blank；Then hydraulic press readjustment arrives initial position, and compacting mould is unloaded and is changed to punch-pin, then blank is molded, and after a crank throw shaping, first starting device lifts upper shuttering and matched moulds support frame, and the air cylinder of horizontal direction starts, and is molded, and takes out forging.The present invention gives full play to double action hydraulic press low energy consumption, efficient feature, the design of frock greatly shortens matched moulds open time, production efficiency improves, and the tool structure is simple, reliable operation, handling ease, convenient disassembly, while this method not only can guarantee that the fiber flow direction of forging is not cut off, and improve the Forming Quality of crank throw, and the utilization rate of crank throw material is improved, reduce the production cost of crank throw.
Description
Technical field
The present invention relates to the technological equipment and method of a kind of crank throw shaping, and in particular to is forged on a kind of double action hydraulic press bent
The technological equipment and method turned
Background technology
The main core component of large ship internal combustion engine is bent axle, can be with one-shot forming, greatly unlike middle-size and small-size bent axle
Type crank axle for vessel is mainly produced using combined method, and the difficult point of built-up crankshaft forging is that crank throw forges.At present by double acting liquid
Press forging crank throw is a kind of relatively advanced, efficient processing method.Crank throw after machined not only has well firm
Degree and intensity, also higher dimensional accuracy, form accuracy are more at this stage to be combined using block method, ring forging method, pier forging method forging half
Crank throw in formula crankshaft used for large boat.Block method forging out crank throw surplus it is big, cost is high and has cut off the gold of crank throw
Belong to fiber, forming quality is not high；Ring forges method forging difficult forming, and forming technology is complicated, has to equipment and operating technology very high
Requirement, may have stomata in the crank throw forging after shaping, practicality is not very strong；Pier forging method needs a set of special forging
Mould and its auxiliary device, cost is high, is not suitable for small lot production.Therefore, study a kind of moulding process of new large-scale crank throw with
Frock, there is particularly important meaning to the Forming Quality and operating efficiency for improving crank throw.
The content of the invention
Problem be present for above-mentioned, it is an object of the invention to combine double action hydraulic press low energy consumption, efficient advantage, carry
For one kind forging crank throw technological equipment and method, simplify manufacturing procedure, improve forging production efficiency, save the energy, improve forging
Forming Quality.
The object of the invention is realized by following technical proposals：
The technological equipment of crank throw is forged on a kind of double action hydraulic press, including：It is fixed on upper on double action hydraulic press outer slide
Shuttering, the base being fixed on horizontally movable workbench, the air cylinder being fixed on base, by U-shaped die cavity and template
Closed mould cavity that the die cavity of die cavity two and half is formed with cavity plate and immediately below upper shuttering, is fixed in double action hydraulic press sliding
Compacting mould or punch-pin on block, are placed in the lower shuttering being connected on base by bolt with U-shaped die cavity；Set in the upper shuttering
There is the trapezoid area that inclination angle is α, the inclined-plane to be matched with the trapezoid area of upper shuttering, institute are provided with the outside of the closed mould cavity
The side connection matched moulds support frame of shuttering is stated, the matched moulds support frame bottom side is provided with vertical with table plane put down
Face, opposite side are provided with the inclined-plane that inclination angle is β, and the lower shuttering is provided with the inclined-plane to be matched with matched moulds support frame inclined-plane,
After the upper shuttering is fallen, inclined-plane is brought into close contact on the outside of the trapezoid area and closed mould cavity of upper shuttering, the matched moulds support
After frame is fallen with upper shuttering, its vertical plane is brought into close contact with template die cavity, and its inclined-plane is brought into close contact with lower shuttering inclined-plane,
The template die cavity and cavity plate are all fixed on base, and template die cavity inner surface is in close contact with cavity plate outer surface, the lower conjunction
Template is connected in the horizontal direction by air cylinder connector with air cylinder, and the U-shaped die cavity is in the horizontal direction by calming the anger
The lower shuttering of cylinder traction completes the opening and closing mould of closed mould cavity.
A kind of method that crank throw is forged on double action hydraulic press, including following process：
1) matched moulds process：The upper shuttering being connected with matched moulds support frame is fixed on double action hydraulic press outer slide, started
The pneumatic cylinder of horizontal direction, pneumatic cylinder drive lower shuttering along horizontal table and then drive U-shaped die cavity and be fixed on base
Template die cavity and cavity plate be close together matched moulds formed closed mould cavity；
2) blank process is placed：Blank is put into closed mould cavity, closed mould cavity is moved to by mobile and horizontal workbench
The underface of shuttering, start double action hydraulic press outer slide, upper shuttering and matched moulds support frame are slowly put down, in this process
In, it should be brought into close contact the trapezoid area of shuttering and the inclined-plane of closed mould cavity, and make matched moulds support frame vertical plane close adhesion plate
Pattern chamber outer surface, lower shuttering inclined-plane is close on matched moulds support frame inclined-plane, untill upper shuttering can not decline；
3) blank compacting process：Compacting mould is fixed on the inner slide of double action hydraulic press, started sliding in double action hydraulic press
Block, compacting mould is driven to complete the compacting to blank；
4) crank throw molding procedure：Double action hydraulic press inner slide readjustment is arrived into initial position, compacting mould is unloaded, changed convex
Mould, then start double action hydraulic press inner slide, drive punch-pin to complete the shaping of crank throw；
5) crank throw removal process：Double action hydraulic press inner slide readjustment is arrived into initial position, starts double action hydraulic press outer slide
Upper shuttering is slowly lifted, and mobile and horizontal workbench removes closed mould cavity, starts the pneumatic cylinder of horizontal direction afterwards,
Under the thrust of horizontal pneumatic cylinder, drive lower shuttering and U-shaped die cavity to be moved to predetermined stroke together, make crank throw completely naked
Expose, then taken out crank throw using pick-off unit.
The process unit and method of the present invention employs the forging technology and frock with die forging principle, utilizes double acting hydraulic pressure
Machine is molded the new technology of crank throw, gives full play to double action hydraulic press low energy consumption, efficient feature, double action hydraulic press can carry simultaneously
For pressure both horizontally and vertically, the offer mold clamping force and mould opening force of horizontal direction, vertical direction blank is carried out compacting and
Shaping, compared with traditional crank throw moulding process, shaped by the crank throw that principle is carried out of die forging, crank throw metal can not only be kept
Fiber flow direction be not cut off, effectively eliminate internal flaw, improve the Forming Quality of crank throw, and improve crank throw material
Utilization rate, reduce the production cost of crank throw, greatly improve production efficiency, the technological equipment is simple in construction, reliable operation,
Handling ease, pickup are convenient.
Brief description of the drawings
Fig. 1 a are forging crank throw front view；Fig. 1 b are forging crank throw side view.
Fig. 2 is the technological equipment front view of the present invention.
Fig. 3 is the side view of technological equipment shown in Fig. 2.
Fig. 4 is the top view of technological equipment shown in Fig. 2.
Fig. 5 is upper shuttering and the matched moulds support frame structure diagram of technological equipment shown in Fig. 2.
Fig. 6 is the part frock schematic diagram that technological equipment shown in Fig. 2 removes upper shuttering and matched moulds support frame.
Fig. 7 a are the compacting mould front views of technological equipment shown in Fig. 2；Fig. 7 b are compacting mould side views.
Fig. 8 a are the preceding liner plate front views of technological equipment shown in Fig. 2；Fig. 8 b are preceding liner plate side views.
Fig. 9 a are the upper shuttering front views of technological equipment shown in Fig. 2；Fig. 9 b are upper shuttering top views.
Figure 10 a are the U-shaped die cavity front views of technological equipment shown in Fig. 2；Figure 10 b are U-shaped die cavity top views.
Figure 11 is the cavity plate front view of technological equipment shown in Fig. 2；Figure 11 b are cavity plate top views.
Figure 12 is the base front view of technological equipment shown in Fig. 2；Figure 12 b are base vertical views.
In figure：1- bases；2- air cylinder fixed plates；3- air cylinders；4- cylinder connection pieces；5- matched moulds frame fixed blocks；6- matched moulds
Support frame；7- is compacted mould；8- punch-pin；The upper shutterings of 9-；Shuttering under 10-；11- die blocks；12- cavity plates；Served as a contrast before 13-
Plate；14- guide rails；15-U pattern chambers；16-T type liner plates；17- rear lining plates；The straight liner plates of 18-；19- template die cavitys.
Embodiment
Below in conjunction with the accompanying drawings and embodiment the present invention will be further described：
In the embodiment of the present invention, the forging crank throw according to Fig. 1 a, b, devise and crank throw is forged on double action hydraulic press
Technological equipment, concrete structure is as shown in Fig. 2~12.
The technological equipment of the present invention includes the upper shuttering 9 being fixed on double action hydraulic press outer slide, and it passes through matched moulds frame
Fixed block 5 is connected with matched moulds support frame 6, drives upper shuttering 9 to place it at the top of closed mould cavity by double action hydraulic press outer slide,
Provided with the trapezoid area that inclination angle is α=7 ° in upper shuttering 9, with having the inclined-plane of same tilt angle [alpha] on the outside of closed mould cavity
It is brought into close contact, this design structure, not only avoids again the upper shuttering of made component support, avoid frock excessively heavy, Er Qiebao
Shuttering is not fallen out on card, moreover it is possible to plays a part of matched moulds.Trapezoid area corner adds small cylindrical tank, reduces stress concentration so as to prolong
Long part service life (referring to Fig. 9).
Matched moulds support frame 6 uses welding structure, both reduces difficulty of processing, while also ensure working strength.Matched moulds supports
Frame bottom side is designed to the plane vertical with table plane, can be brought into close contact with template die cavity 19；Matched moulds support frame 6 is another
Inclined-plane of the side with inclination angle beta=8 ° is brought into close contact with lower inclined-plane of the shuttering 10 with same tilt angle beta, is ensured simultaneously
Matched moulds support frame 6 falls in the closed area that both template die cavity 19 and lower shuttering 10 surround, and so can ensure that offer is enough
Mold clamping force, so as to improve forging quality.
Cavity plate 11 is placed in the rectangular channel at the center of base 1, then base stepped portions place die block 11 (referring to
Figure 12), template die cavity 19 is placed on die block 11, base 1, die block 11, template die cavity 19 pass through bolt
Be fixed together, template die cavity inner surface and cavity plate outer surface are in close contact, U-shaped die cavity 15 under the drive of lower shuttering 10,
Tightly fit together with template die cavity, inner surface and the cavity plate outer surface of U-shaped die cavity are in close contact, template die cavity 19, cavity plate
12, U-shaped die cavity 15 forms closed mould cavity, step is provided with outside U-shaped die cavity and template die cavity, and θ=3 ° are provided with U-shaped die cavity
Inclined-plane (referring to Figure 10,11), because blank is during compacting and shaping, every side of die cavity can all bear very big
Bulging power, the purposes of step in preventing that bulging power makes die cavity deform in forming process, certain angle of inclination be for
In die sinking, reduce Resistance of opening mould, advantageously in completing to mold process.Forward and backward liner plate 13,17 is close to U-shaped die cavity two
Skew back face is placed, and T-shaped liner plate 16 then is close into U-shaped die cavity and placed, is fixed together by bolt and U-shaped die cavity, straight liner plate
18 close adhesion plate pattern chambers are placed, and are fixed together by bolt and template die cavity, the enclosed region that four blocks of liner plates and cavity plate surround
It is exactly the region of forging crank throw shaping.Air cylinder 3 is fixed on again part frock as shown in Figure 6 is just formed on base 1.
Part frock as shown in Figure 6 is placed on transportable horizontal table, lower close is driven using air cylinder 3
Template 10 so drive U-shaped die cavity 15 together fixed thereto move, be close to the template die cavity 19 being fixed on base
Reach matched moulds purpose together, after matched moulds process is completed, blank is slowly put into closed mould cavity, then will be as shown in Figure 6
Part frock is moved on to accordingly immediately below upper shuttering 9, startup double action hydraulic press, utilization is double acting by moving horizontally workbench
The outer slide of hydraulic press drives upper shuttering 9 and matched moulds support frame 6 slowly to put down it, the tilt angle alpha of upper shuttering it is oblique
Face is brought into close contact with closed mould cavity outboard cant angle degree α inclined-planes, and closed mould cavity is securely fastened to be ensured in forming process together
Enough mold clamping forces are provided；First compacting mould 7 is fixed on double action hydraulic press inner slide on vertical direction, starts double acting hydraulic pressure
Machine, compacting process is carried out to blank, after compacting process is completed, double action hydraulic press readjustment arrives initial position, and compacting mould 7 is unloaded
Under, punch-pin 8 is changed, repeats to be compacted process to blank progress molding procedure, after the process is completed, the inner slide of double action hydraulic press
Initial position is adjusted back, starts double action hydraulic press outer slide and upper shuttering 9 and matched moulds support frame 6 is slowly lifted to initial height
Degree, it is ensured that will not be interfered when horizontal table removes remaining frock, using horizontal table by part frock shown in Fig. 6
Remove.Start air cylinder 3, shuttering 10 and be fixed together U-shaped die cavity 15 with lower shuttering under being driven under its thrust
Molded, during die sinking, T-shaped liner plate 16 leaves certain interval with preceding liner plate 13, rear lining plate 17, and is set in U-shaped die cavity
There is the inclined-plane of θ=3 °, forward and backward liner plate is provided with inclination angle γ=θ inclined-plane, because the binding face of U-shaped die cavity, front and rear liner plate is oblique
It face, can thus greatly reduce Resistance of opening mould, guide rail 14 is added on base 1, is in order to avoid during die sinking, calming the anger
The couple that the thrust of cylinder 3 and Resistance of opening mould are formed makes lower shuttering 10 deflect, and avoids next matched moulds that lateral deviation occurs, influences to be molded
Quality, treat that air cylinder 3 drives lower shuttering 10 and U-shaped die cavity 15 to be moved to predetermined stroke together, crank throw is exposed completely
Come, then taken out crank throw using pick-off unit.So far, a complete crank throw forging molding process is completed.
Claims (8)
1. the technological equipment of crank throw is forged on a kind of double action hydraulic press, it is characterised in that including：It is fixed on sliding outside double action hydraulic press
Upper shuttering on block, the base being fixed on horizontally movable workbench, the air cylinder being fixed on base, by U-shaped mould
Chamber and the die cavity of template die cavity two and half are formed with the cavity plate and closed mould cavity immediately below upper shuttering, is fixed on double acting liquid
Compacting mould or punch-pin on press inner slide, are placed in the lower shuttering being connected on base by bolt with U-shaped die cavity；The upper conjunction
Provided with the trapezoid area that inclination angle is α in template, the closed mould cavity outside is provided with to match with the trapezoid area of upper shuttering
Inclined-plane, the upper shuttering side connection matched moulds support frame, the matched moulds support frame bottom side be provided with put down with workbench
The vertical plane in face, opposite side are provided with the inclined-plane that inclination angle is β, and the lower shuttering is provided with and matched moulds support frame inclined-plane kissing
The inclined-plane of conjunction, after the upper shuttering is fallen, inclined-plane is brought into close contact on the outside of the trapezoid area and closed mould cavity of upper shuttering, described
After matched moulds support frame is fallen with upper shuttering, its vertical plane is brought into close contact with template die cavity, its inclined-plane and lower shuttering inclined-plane
It is brought into close contact, the template die cavity and cavity plate are all fixed on base, and template die cavity inner surface is in close contact with cavity plate outer surface,
The lower shuttering is connected in the horizontal direction by air cylinder connector with air cylinder, and the U-shaped die cavity is in the horizontal direction
The opening and closing mould of lower shuttering completion closed mould cavity is drawn by air cylinder.
2. the technological equipment of crank throw is forged on double action hydraulic press according to claim 1, it is characterised in that the closure mould
Intracavitary is respectively provided with the straight liner plate for the mould cavity area for forming closing, T-shaped liner plate and forward and backward liner plate, and forward and backward liner plate, which carries, to incline
Oblique angle γ.
3. the technological equipment of crank throw is forged on double action hydraulic press according to claim 1, it is characterised in that the upper matched moulds
The trapezoid area corner of plate is provided with small cylindrical tank, and the two bottom sides of the lower shuttering are provided with step, and the female bottom surrounding is set
There is step.
4. the technological equipment of crank throw is forged on double action hydraulic press according to claim 1, it is characterised in that the U-shaped mould
The outside of chamber and template die cavity is equipped with step, and the region that U-shaped mold cavity forms die cavity is provided with tiltangleθ.
5. the technological equipment of crank throw is forged on double action hydraulic press according to claim 1, it is characterised in that the inclination angle
α=7 °, angle of inclination beta=8 °.
6. the technological equipment of crank throw is forged on double action hydraulic press according to claim 1, it is characterised in that the inclination angle
γ=3 °.
7. the technological equipment of crank throw is forged on double action hydraulic press according to claim 1, it is characterised in that the inclination angle
θ=γ.
8. the method for crank throw is forged on a kind of double action hydraulic press, it is characterised in that：Including following process：
1) matched moulds process：The upper shuttering being connected with matched moulds support frame is fixed on double action hydraulic press outer slide, started horizontal
The pneumatic cylinder in direction, pneumatic cylinder drive lower shuttering along horizontal table and then drive U-shaped die cavity and the plate being fixed on base
Pattern chamber and cavity plate be close together matched moulds formed closed mould cavity；
2) blank process is placed：Blank is put into closed mould cavity, closed mould cavity is moved to upper matched moulds by mobile and horizontal workbench
The underface of plate, start double action hydraulic press outer slide, upper shuttering and matched moulds support frame are slowly put down, in the process, should
The trapezoid area of shuttering and the inclined-plane of closed mould cavity are brought into close contact, and makes matched moulds support frame vertical plane close adhesion plate pattern chamber
Outer surface, lower shuttering inclined-plane is close on matched moulds support frame inclined-plane, untill upper shuttering can not decline；
3) blank compacting process：Compacting mould is fixed on the inner slide of double action hydraulic press, starts double action hydraulic press inner slide, band
Dynamic pressure reality mould completes the compacting to blank；
4) crank throw molding procedure：Double action hydraulic press inner slide readjustment is arrived into initial position, compacting mould is unloaded, changes punch-pin, so
Start double action hydraulic press inner slide afterwards, drive punch-pin to complete the shaping of crank throw；
5) crank throw removal process：Double action hydraulic press inner slide readjustment is arrived into initial position, starting double action hydraulic press outer slide will be upper
Shuttering slowly lifts, and mobile and horizontal workbench removes closed mould cavity, starts the pneumatic cylinder of horizontal direction afterwards, in level
Under the thrust of pneumatic cylinder, drive lower shuttering and U-shaped die cavity to be moved to predetermined stroke together, crank throw is exposed completely
Come, then taken out crank throw using pick-off unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710682239.5A CN107520394A (en) | 2017-08-10 | 2017-08-10 | The technological equipment and method of crank throw are forged on double action hydraulic press |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710682239.5A CN107520394A (en) | 2017-08-10 | 2017-08-10 | The technological equipment and method of crank throw are forged on double action hydraulic press |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107520394A true CN107520394A (en) | 2017-12-29 |
Family
ID=60680789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710682239.5A Pending CN107520394A (en) | 2017-08-10 | 2017-08-10 | The technological equipment and method of crank throw are forged on double action hydraulic press |
Country Status (1)
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| CN (1) | CN107520394A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109014010A (en) * | 2018-09-21 | 2018-12-18 | 上海电气上重铸锻有限公司 | A kind of extrusion forming device and forming method of marine low speed diesel engine crank forged piece |
| CN109530605A (en) * | 2018-11-28 | 2019-03-29 | 上海电气上重铸锻有限公司 | A kind of large size crank throw forging apparatus and forging method |
| CN110695155A (en) * | 2019-09-30 | 2020-01-17 | 上海电机学院 | Crank bend forging forming device and crank bend forging forming method |
| CN110976741A (en) * | 2019-12-13 | 2020-04-10 | 上海电机学院 | Technological equipment for forging crank on double-acting hydraulic press and machining method |
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| CN2768922Y (en) * | 2004-09-29 | 2006-04-05 | 武汉重工铸锻有限责任公司 | Equipment for producing ship large diesel engine crankshaft crank throw |
| CN202316882U (en) * | 2011-11-16 | 2012-07-11 | 天津重型装备工程研究有限公司 | Die for forging crank throw forged pieces of semi-built-up crank shaft |
| CN103128209A (en) * | 2011-11-28 | 2013-06-05 | 上海重型机器厂有限公司 | Half die forging method and half die forging device of crank throw for large ship |
| KR20130075973A (en) * | 2011-12-28 | 2013-07-08 | 현대중공업 주식회사 | Die forging for crank throw blank manufacture |
| CN104493030A (en) * | 2014-12-10 | 2015-04-08 | 鞍钢重型机械有限责任公司 | Forging method for crank forging piece |
| CN204700224U (en) * | 2015-03-19 | 2015-10-14 | 燕山大学 | The vertical split cast mounting of multinomial die forging |
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| CN2768922Y (en) * | 2004-09-29 | 2006-04-05 | 武汉重工铸锻有限责任公司 | Equipment for producing ship large diesel engine crankshaft crank throw |
| CN202316882U (en) * | 2011-11-16 | 2012-07-11 | 天津重型装备工程研究有限公司 | Die for forging crank throw forged pieces of semi-built-up crank shaft |
| CN103128209A (en) * | 2011-11-28 | 2013-06-05 | 上海重型机器厂有限公司 | Half die forging method and half die forging device of crank throw for large ship |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109014010A (en) * | 2018-09-21 | 2018-12-18 | 上海电气上重铸锻有限公司 | A kind of extrusion forming device and forming method of marine low speed diesel engine crank forged piece |
| CN109530605A (en) * | 2018-11-28 | 2019-03-29 | 上海电气上重铸锻有限公司 | A kind of large size crank throw forging apparatus and forging method |
| CN110695155A (en) * | 2019-09-30 | 2020-01-17 | 上海电机学院 | Crank bend forging forming device and crank bend forging forming method |
| CN110976741A (en) * | 2019-12-13 | 2020-04-10 | 上海电机学院 | Technological equipment for forging crank on double-acting hydraulic press and machining method |
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Application publication date: 20171229 |
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| WD01 | Invention patent application deemed withdrawn after publication |