CN108637151B - A kind of lightweight special-shaped shell body partial plastic forming method - Google Patents
A kind of lightweight special-shaped shell body partial plastic forming method Download PDFInfo
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- CN108637151B CN108637151B CN201810233355.3A CN201810233355A CN108637151B CN 108637151 B CN108637151 B CN 108637151B CN 201810233355 A CN201810233355 A CN 201810233355A CN 108637151 B CN108637151 B CN 108637151B
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- punch
- pin
- shell body
- shaped shell
- lantern ring
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
-
- 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
Abstract
The invention discloses a kind of lightweight special-shaped shell body partial plastic forming methods, it comprises the following steps: (1) preparing before forming: the lightweight special-shaped shell body partial plastic forming mold after preheating insulation being mounted on press machine, then preheated lightweight special-shaped shell body part is placed into cavity plate；(2) forming process: being that lightweight special-shaped shell body partial plastic forming mold is in place the stage first, punch-pin end is first contacted with blank, and as continuing traveling downwardly for upper die component protrudes into mandrel in shell, boss is flared blank in the middle part of punch-pin；The upsetting formation stage；Punch-pin rises, and puts on the lantern ring with hierarchic structure, and punch-pin generates relative motion, and after punch-pin is contacted with blank, punch-pin retainer plate is contacted with lantern ring at this time, and moves down lantern ring, carries out jumping-up to shell end metal；(3) after the completion of upsetting formation: punch-pin being driven to rise and be detached from lightweight special-shaped shell body.The present invention solve in special-shaped shell body monolithic molding part easily occur unstability, generation collapse angle, folding, the defects of.
Description
Technical field
The present invention relates to metal material plastic working technique and forming technique fields, in particular to are used for light-alloy abnormity structure
The gathering stock of part oral area shapes, and in particular to a kind of lightweight special-shaped shell body partial plastic forming method.
Background technique
Al alloys andMg alloys intensity is high, corrosion-resistant, light-weight, processability is good, is suitable for suppressing, welding, forge etc. a variety of add
Work, therefore it is widely used in field of aerospace and industrial production.Special-shaped shell body part is because of its light weight, high voltage bearing feature
There are a large amount of uses in the fields such as weaponry, space flight and power engineering, petrochemical industry and energy source and power.These design of part are multiple
Miscellaneous, shape is special, therefore requires its processing technology stringent.
The production method of special-shaped shell body component mainly has welding or casting etc. after machining, separately manufacturing at present.However
Although simple mechanical is processed, surface accuracy is higher, and production efficiency is low, and wastage of material is serious；The finished product tissue by the way of casting
It is coarse, the defects of being also easy to produce stomata, sand holes, crackle, influence part performance；Welding procedure is also easy to produce crackle, is mingled with, and influences part
Fatigue behaviour.Therefore the monolithic molding mode of conventional extruded is used, the defect that can be generated to avoid process above, but due to different
Shape housing part is complex, multiple working procedure need to be taken to complete, the blank empennage of preform bottom four first and it is counter squeeze, then lead to
Cross gathering stock Shaped shell mouth rim, final part forming.However in the forming of shell mouth flange, it be easy to cause mistake
Surely, the problems such as generating angle of collapsing, folding, burr, not full filling, is unable to satisfy the requirement of part size and performance.
Summary of the invention
The object of the present invention is to provide a kind of solution, in special-shaped shell body monolithic molding, unstability easily occurs for part, and generation is collapsed
The defects of angle, folding, burr, discontented filling, the dimensional accuracy of workpiece is improved, satisfactory mechanical property, forming can be obtained well
The lightweight special-shaped shell body partial plastic forming method of forging.
In order to solve the problems existing in background technology, the present invention adopts the following technical scheme:
A kind of lightweight special-shaped shell body partial plastic forming method, it is comprised the following steps:
(1) prepare before forming: by lightweight special-shaped shell body heat parts to forming temperature；Preheat lightweight special-shaped shell body part at
Shape mold, it includes the upper mold component connecting with the superstructure of press machine, and is connect down with press machine substructure
Die assembly；The upper mold component includes cope plate, the upper die plate, compression for the upper table connection connecting with press machine
Workbench on spring, punch-pin retainer plate and punch-pin, the cope plate fastening bolt and press machine assembles, the upper mold
Plate, upper die plate and punch-pin retainer plate are assembled together by soket head cap screw, and the punch-pin and punch-pin retainer plate pass through spiral shell
Cap is assembled together, and the compressed spring is fixed between punch-pin and upper die plate；The lower die assembly includes and pressure
Sectional female die, shrink ring, jacking block, lower mold backing plate, lower template, mandril and the lantern ring of the lower table connection of power machine, it is described
Lower template fastening bolt and press machine lower table assemble, and the lower template, lower mold backing plate and shrink ring pass through interior six
Angle screw is secured together, and sectional female die is coaxially arranged in the shrink ring, the bottom of the sectional female die is under
Jacking block is provided between die-cushion plate, the mandril is vertically co-axially located at the middle part of lower mold backing plate and lower template, and its top surface
It is touched with the bottom surface of jacking block, the lantern ring is co-axially located between punch-pin retainer plate and sectional female die, and lantern ring is coaxially socketed
In punch-pin outer wall；
Lightweight special-shaped shell body partial plastic forming mold after preheating insulation is mounted on press machine；Will with lightweight abnormity
Housing part contact punch-pin, sectional female die, lantern ring surface uniformly apply oil base graphitic lubricant, then will be preheated
Lightweight special-shaped shell body part is placed into cavity plate；
(2) forming process: being that lightweight special-shaped shell body partial plastic forming mold is in place the stage first；Press machine drives upper mold
Cope plate, upper die plate and the punch structure of tool component move downward, and punch-pin end is first contacted with blank, at this time with upper mold group
Continuing traveling downwardly for part protrudes into mandrel in shell, and after mold reaches designated position, boss is flared blank in the middle part of punch-pin；
The upsetting formation stage；At this moment, punch-pin rises, and puts on the lantern ring with hierarchic structure, will since lantern ring is heavier
Collar design is 3, places, stacks respectively, and with continuing traveling downwardly for upper die component, punch-pin generates relative motion, punch-pin
After contacting with blank, compressed spring starts to compress, and the downward power that upper die plate generates compressed spring can be with blank to punch-pin
The upward power generated is cancelled out each other, and radial fixation is carried out to shell, prevents metal radially inward from being flowed；It is convex at this time
Mould retainer plate is contacted with lantern ring, and moves down lantern ring, jumping-up is carried out to shell end metal, in the work of concave-convex mold and lantern ring
Under, end metal is gradually deformed, and until metal fills up concave-convex mold and set czermak space, flange, which just shapes, to be terminated；
(3) after the completion of upsetting formation: stopping press machine upper table and move downward, press machine upper table is transported back up
It is dynamic, drive punch-pin to rise and be detached from lightweight special-shaped shell body, mandril moves upwards, and jacking block, sectional female die and part are in mandril
It is ejected under effect.
As a further improvement of the present invention；The compressed spring is cylindroid helical-coil compression spring.
As a further improvement of the present invention；The sectional female die is to divide valve sectional die.
As a further improvement of the present invention；The gradient boss for being 70 ° is arranged in the punch-pin middle section.
As a further improvement of the present invention；A ladder-like bulge-structure is extended downwardly out in the middle part of the lantern ring bottom surface.
After adopting the above technical scheme, the invention has the following advantages:
The present invention is to generate collapse angle, folding, hair to solve the part in special-shaped shell body monolithic molding and unstability easily occurs
Thorn, a kind of partial plastic forming technique filling the defects of discontented and proposing, improve the dimensional accuracy of workpiece, can obtain mechanical performance
Well, good forging is shaped.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the status diagram in embodiment provided by the present invention before branch shells part extrusion molding；
Fig. 2 is the status diagram in embodiment provided by the present invention after branch shells part extrusion molding；
Fig. 3 is branch shells part oral area gathering stock shaping dies installation diagram in embodiment provided by the present invention；
Fig. 4 is thimble structure schematic diagram in embodiment provided by the present invention；
Fig. 5 is working state schematic representation before punch-pin falls after being put into blank in embodiment provided by the present invention；
Fig. 6 is embodiment convex mould provided by the present invention decline, working state schematic representation when blank end is flared；
Fig. 7 is working state schematic representation when set being located on punch-pin preparation jumping-up in embodiment provided by the present invention；
Fig. 8 is embodiment convex mould provided by the present invention pushing, the final upsetting formation working condition signal of component ends
Figure；
Appended drawing reference:
1- cope plate；2- soket head cap screw one；3- upper die plate；4- compressed spring；5- punch-pin retainer plate；6- nut；7-
Punch-pin；8- sectional female die；9- shrink ring；10- jacking block；11- lower mold backing plate；12- soket head cap screw two；13- lower template；14-
Mandril；15- lantern ring.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing and specific implementation
Mode, the present invention will be described in further detail.It should be appreciated that the specific embodiments described herein are only to explain this
Invention, is not intended to limit the present invention.
Fig. 1-Fig. 8 is please referred to, present embodiment uses a kind of following technical scheme: lightweight special-shaped shell body partial plastic forming
Mold, it includes the upper mold component connecting with the superstructure of press machine, and the lower die connecting with press machine substructure
Has component；
The upper mold component includes the cope plate 1 for the upper table connection connecting with press machine, upper die plate 3, pressure
Contracting spring 4, punch-pin retainer plate 5 and punch-pin 7, the cope plate 1 is assembled with fastening bolt and the workbench on press machine, described
Cope plate 1, upper die plate 3 and punch-pin retainer plate 5 be assembled together by soket head cap screw 1, the punch-pin 7 and punch-pin
Retainer plate 5 is assembled together by nut 6, and the gradient boss for being 70 °, the pressure is arranged in 7 middle section of punch-pin
Contracting spring 4 is fixed between punch-pin 7 and upper die plate 3, and the compressed spring 4 is cylindroid helical-coil compression spring；
The lower die assembly includes the sectional female die 8 connecting with the lower table of press machine, shrink ring 9, jacking block
10, lower mold backing plate 11, lower template 13, mandril 14 and lantern ring 15 work under the lower template 13 fastening bolt and press machine
Platform assembly, the lower template 13, lower mold backing plate 11 and shrink ring 9 are secured together by soket head cap screw 2 12, described
Shrink ring 9 in be coaxially arranged with sectional female die 8, the sectional female die is to divide valve sectional die, and described divides valve recessed
Jacking block 10 is provided between the bottom and lower mold backing plate 11 of mould 8, the mandril 14 is vertically co-axially located at 11 He of lower mold backing plate
The middle part of lower template 13, and its top surface and the bottom surface of jacking block 10 touch, the lantern ring 15 is co-axially located at 5 He of punch-pin retainer plate
Between sectional female die 8, and lantern ring 15 is coaxially socketed in 7 outer wall of punch-pin, extends downwardly out single order in the middle part of 15 bottom surface of lantern ring
Scalariform bulge-structure.
Present embodiment additionally provides a kind of lightweight special-shaped shell body partial plastic forming method, it is comprised the following steps:
(1) prepare before forming: by twig shells heat parts to forming temperature；By the mold after preheating insulation by above
The assembly relation is mounted on press machine；Will punch-pin 7, sectional female die 8, lantern ring with twig shells feature contacts
15 surface uniformly applies oil base graphitic lubricant, and preheated twig shells part is then placed into sectional female die 8
It is interior, as shown in Figure 5；
(2) forming process: being that mold is in place the stage first.Press machine drives the cope plate 1 of upper mold component, upper mold
The downward movements such as backing plate 3 and punch-pin 7.7 end of punch-pin is first contacted with blank, at this time as continuing traveling downwardly for upper die component makes
Mandrel protrudes into shell, and after mold reaches designated position, 7 middle part boss of punch-pin is contacted with blank and is flared to blank, such as
Shown in Fig. 6.
Next enter the upsetting formation stage.At this moment, punch-pin 7 rises, and puts on stair-stepping lantern ring 15, such as Fig. 7 institute
Show.With continuing traveling downwardly for upper die component, punch-pin 7 generates relative motion, and after punch-pin is contacted with blank, compressed spring 4 starts to press
Contracting, the upward power that upper die plate 3 can generate the downward power that compressed spring 4 generates with blank to punch-pin 7 is cancelled out each other, right
Shell carries out radial fixation, prevents metal radially inward from being flowed.Punch-pin retainer plate 5 is contacted with lantern ring 15 at this time, and
Lantern ring 15 is moved down, jumping-up is carried out to shell end metal, under the action of concave-convex mold and lantern ring, end metal gradually becomes
Shape, until metal fills up concave-convex mold and set czermak space, flange, which just shapes, to be terminated, as shown in Figure 8.
(3) after the completion of upsetting formation: stopping moving downward for press machine upper table, press machine upper table is back up
Movement drives punch-pin 7 to rise and be detached from twig shells.Mandril 14 moves upwards, and jacking block 10, sectional female die 8 and part exist
It is ejected under the action of mandril 14.
The principle of present embodiment are as follows:
For the metal plastic flow of blank end upsetting formation, scholars have done a large amount of Physical Experiment and deep
Theory analysis research has summed up corresponding upsetting rule, wherein rule first is that: participate in the pipe initial length l of deformed part0
The ratio between with wall thickness t, i.e. upset ratio λ=l0When/t≤3.0, pipe can in primary deformation jumping-up to any shape and size,
And inside, outer wall do not generate folding, recess or other defects；As λ=l0When/t >=3.0, poly- material should be carried out repeatedly, wall thickness
Rule change is:
tn=(1.5~1.3) tn-1
In formula: tn-1Pipe wall thickness when-the (n-1)th poly- material；
tnN-th gathers pipe wall thickness when material:
T=(D0-d0)/2
According to calculating, which is 1.27, less than 3.0, therefore can be by once deforming carry out upsetting
Slightly.
Firstly, in jumping-up, metal is flowed to inner radial in order to prevent, and generation phenomena such as cause unstability, need to set
A kind of punch-pin and cavity plate are counted, cooperation props up shell completely, shell other parts when jumping-up is made not deform.Due to this twig class
The bottom of Shell Forging Parts is there are four tail structure, in order to reduce the stress in forming process in matrix cavity, Optimize the forming scheme environment,
And for the ease of being placed and taken out workpiece, cavity plate, which uses, in the present invention divides valve composable mold, in punch-pin lower shape and shell
Portion is fully mated.When upper module moves downward, punch-pin is progressed into shell, until contacting completely with shell, with cavity plate
Combination, which reaches, is completely fixed shell.To prevent the Radial Flow of metal, reach good forming effect.
Secondly as the flowing of the interior outside metal of shell wall is very uneven, flange folding will occur in this case
It is folded and collapse angle the phenomenon that, be unable to reach forming requirements.In order to solve this problem, improve the mobility of metal, it is necessary in upsetting
A degree of flaring processing is carried out to blank end before thick.Facts proved that carrying out jumping-up after flaring again can reach relatively
Good effect.
The selection of flaring amount is the key that forming, without being flared or when flaring amount is small, although the shell in jumping-up
There is the fixed limitation of punch-pin core in inside, but the phenomenon that be equally easy to happen unstability in jumping-up, leads to the generation folded and angle of collapsing
Appearance.When flaring amount is big, the degree of turning up when jumping-up is big, and jumping-up decreased effectiveness can make the thickness low LCL of flange, under
Edge exterior angle is collapsed, and angle is serious, and excess metal squeezes into clearance between punch and die and forms longitudinal thick burr.Outer end in flange in order to prevent simultaneously
Metal cooling velocity is fast and its resistance of deformation is caused to increase, and is formed and is folded in its deformation process, should carried out to it before jumping-up
Chamfering appropriate, convenient for forming.So in the present invention, the middle section of punch-pin increases the boss that gradient is 70 °, when convex
While mould moves down, flaring processing can be carried out in shell end, expand shell internal-and external diameter, convenient in following jumping-up mistake
Metal radially flows in journey, makes end formed full, clear-cut, significantly reduces forming defects.
Simultaneously as opposite sliding, punch-pin top punch-pin retainer plate form a cavity, cause core punch-pin when pushing by
Cannot be guaranteed when the power moved upwards given to blank it is fixed a position, can not effectively inside supporing shell,
Upper part of the housing flange is caused to can not be successfully forming, so installing spring arrangement additional in empty cavity position, spring generates top inner support
Downward power can cancel out each other with blank to the upward power that top inner support generates, ensure the position of inner support to the greatest extent
Set motionless, guarantee upper part of the housing flange forming accuracy.
Finally, carrying out gathering stock after preparation.At this moment, press ram drives punch-pin to rise, on punch-pin
It puts on stair-stepping lantern ring, then as moving down for punch-pin, punch-pin lower part is contacted with enclosure interior, carries out diameter to it
To fixation, prevent metal radially inward from being flowed.Module continues to move down, and spring-compressed touches shell end
Lantern ring constantly move down, to shell end metal carry out jumping-up, under the action of concave-convex mold and lantern ring, end metal gradually becomes
Shape, until metal fills up concave-convex mold and set czermak space, flange forming terminates.
Workpiece ejects cavity plate when taking out together, separates sectional female die and takes out workpiece.Ejecting force is larger in order to prevent simultaneously
4 empennages of defective work piece need to add a cushion block under cavity plate, cushion block, cavity plate and workpiece are ejected simultaneously.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included within the present invention.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (5)
1. a kind of lightweight special-shaped shell body partial plastic forming method, which is characterized in that it is comprised the following steps:
(1) prepare before forming: by lightweight special-shaped shell body heat parts to forming temperature；Preheat lightweight special-shaped shell body partial plastic forming mould
Tool, it includes the upper mold component connecting with the superstructure of press machine, and the lower mold connecting with press machine substructure
Component；The upper mold component includes the cope plate, upper die plate, compression bullet for the upper table connection connecting with press machine
Workbench on spring, punch-pin retainer plate and punch-pin, the cope plate fastening bolt and press machine assembles, the upper mold
Plate, upper die plate and punch-pin retainer plate are assembled together by soket head cap screw, and the punch-pin and punch-pin retainer plate pass through spiral shell
Cap is assembled together, and boss is provided in the middle part of the punch-pin, and the punch-pin lower part is mandrel, and the compressed spring is fixed
Between punch-pin and upper die plate；The lower die assembly includes the sectional female die connecting with the lower table of press machine, pre-
Circle stress, jacking block, lower mold backing plate, lower template, mandril and lantern ring, the lower template fastening bolt and press machine lower table
Assembly, the lower template, lower mold backing plate and shrink ring are secured together by soket head cap screw, in the shrink ring
It is coaxially arranged with sectional female die, jacking block is provided between the bottom and lower mold backing plate of the sectional female die, the mandril hangs down
It is directly co-axially located at the middle part of lower mold backing plate and lower template, and its top surface and the bottom surface of jacking block touch, the lantern ring is coaxially set
It sets between punch-pin retainer plate and sectional female die, and lantern ring is coaxially socketed in punch-pin outer wall；
Lightweight special-shaped shell body partial plastic forming mold after preheating insulation is mounted on press machine；Will be with lightweight special-shaped shell body
The punch-pin of feature contacts, sectional female die, lantern ring surface uniformly apply oil base graphitic lubricant, then by preheated lightweight
Special-shaped shell body part is placed into cavity plate；
(2) forming process: being that lightweight special-shaped shell body partial plastic forming mold is in place the stage first；Press machine drives upper mold group
Cope plate, upper die plate and the punch structure of part move downward, and punch-pin end is first contacted with blank, at this time with upper mold component
Continue traveling downwardly and protrude into mandrel in shell, after mold reaches designated position, boss is flared blank in the middle part of punch-pin；
The upsetting formation stage；At this moment, punch-pin rises, and the lantern ring with hierarchic structure is put on, since lantern ring is heavier, by lantern ring
Be designed as 3, place respectively, stack, with continuing traveling downwardly for upper mold component, punch-pin generates relative motion, punch-pin with
After blank contact, compressed spring starts to compress, and upper die plate can produce the downward power that compressed spring generates with blank to punch-pin
Raw upward power is cancelled out each other, and radial fixation is carried out to shell, prevents metal radially inward from being flowed；Punch-pin at this time
Retainer plate is contacted with lantern ring, and moves down lantern ring, jumping-up is carried out to shell end metal, in the effect of concave-convex mold and lantern ring
Under, end metal gradually deforms, and until metal fills up concave-convex mold and set czermak space, flange, which just shapes, to be terminated；
(3) after the completion of upsetting formation: stop press machine upper table and moves downward, press machine upper table moves back up,
Punch-pin is driven to rise and be detached from lightweight special-shaped shell body, mandril moves upwards, the effect of jacking block, sectional female die and part in mandril
Under be ejected.
2. a kind of lightweight special-shaped shell body partial plastic forming method according to claim 1, which is characterized in that the compression bullet
Spring is cylindroid helical-coil compression spring.
3. a kind of lightweight special-shaped shell body partial plastic forming method according to claim 1, which is characterized in that described divides valve recessed
Mould is to divide valve sectional die.
4. a kind of lightweight special-shaped shell body partial plastic forming method according to claim 1, which is characterized in that in the punch-pin
Between the gradient boss for being 70 ° is partially set.
5. a kind of lightweight special-shaped shell body partial plastic forming method according to claim 1, which is characterized in that the lantern ring bottom
Middle face extends downwardly out a ladder-like bulge-structure.
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| CN201810233355.3A CN108637151B (en) | 2018-03-17 | 2018-03-17 | A kind of lightweight special-shaped shell body partial plastic forming method |
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| CN113102532B (en) * | 2021-04-14 | 2022-03-25 | 中北大学 | Labor-saving forming method suitable for large-size thin-wall conical shell |
| CN113319202B (en) * | 2021-08-03 | 2021-10-08 | 宁波市沃瑞斯机械科技有限公司 | Special-shaped piece phase change composite forming heating device |
| CN114178459B (en) * | 2021-12-07 | 2024-04-02 | 贵州航宇科技发展股份有限公司 | Forming method and die for stainless steel large taper ring with flange |
| CN114273592B (en) * | 2021-12-23 | 2023-06-09 | 湘潭大学 | Partial thickening forming method and mold for unequal-thickness side wall of cylindrical part |
| CN114833286A (en) * | 2022-04-27 | 2022-08-02 | 太原理工大学 | Flaring-upsetting composite forming device and method for end flange of thin-walled pipe |
| CN114769436A (en) * | 2022-05-11 | 2022-07-22 | 烟台大学 | Pipe stamping die |
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| JPH02160138A (en) * | 1988-12-12 | 1990-06-20 | Musashi Seimitsu Ind Co Ltd | Forged forming method for housing for ball joint |
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| JPH02160138A (en) * | 1988-12-12 | 1990-06-20 | Musashi Seimitsu Ind Co Ltd | Forged forming method for housing for ball joint |
| CN102699091A (en) * | 2012-05-21 | 2012-10-03 | 中北大学 | Non-flash die for extruding aluminum alloy shell parts |
| CN107552584A (en) * | 2017-09-14 | 2018-01-09 | 中北大学 | A kind of extrusion forming method of " the big mouth of tripe is small " formula branch class light-alloy component |
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