CN110252925A - Piston head forging mold with annular compound post rod mechanism - Google Patents

Piston head forging mold with annular compound post rod mechanism Download PDF

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Publication number
CN110252925A
CN110252925A CN201910677995.8A CN201910677995A CN110252925A CN 110252925 A CN110252925 A CN 110252925A CN 201910677995 A CN201910677995 A CN 201910677995A CN 110252925 A CN110252925 A CN 110252925A
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CN
China
Prior art keywords
mandril
forging
annular
lower die
rod mechanism
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Pending
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CN201910677995.8A
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Chinese (zh)
Inventor
王飞
宋加兵
黄昌文
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ANHUI ANHUANG MACHINERY Co Ltd
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ANHUI ANHUANG MACHINERY Co Ltd
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Priority to CN201910677995.8A priority Critical patent/CN110252925A/en
Publication of CN110252925A publication Critical patent/CN110252925A/en
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21JFORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J13/00Details of machines for forging, pressing, or hammering
    • B21J13/02Dies or mountings therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21JFORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J13/00Details of machines for forging, pressing, or hammering
    • B21J13/08Accessories for handling work or tools
    • B21J13/14Ejecting devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21KMAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00Making machine elements
    • B21K1/18Making machine elements pistons or plungers

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)

Abstract

The invention discloses the piston head forging molds with annular compound post rod mechanism, including lower mold core, lower die-sleeve, lower mold core to be fixed in lower die-sleeve, and the top surface of lower mold core and the inner surface of lower die-sleeve form forming surface corresponding with piston head forging;The lower mold core bottom is equipped with post rod mechanism, and the mould inside has the cavity for accommodating post rod mechanism, and cavity is to run through structure up and down;The post rod mechanism includes main mandril, T-type mandril, multiple step mandrils, annular mandril.Beneficial effects of the present invention: by the way that unitary mould is divided into two modular structures, respectively lower mold core, lower die-sleeve along mold corner by lower die, the region of stress concentration in forging process is eliminated, die life is significantly improved;And realize that many places ejection, ejecting force are homogenized by multiple step mandrils and annular mandril, it can guarantee that forging is gently ejected, demoulded, the hot forging deformation generated by ejection can be effectively reduced, improve the quality of forging.

Description

Piston head forging mold with annular compound post rod mechanism
Technical field
The present invention relates to a kind of forging mold more particularly to a kind of piston head forgings with annular compound post rod mechanism Modeling tool.
Background technique
Forging steel piston can be divided into two major classes by structure type: single-piece piston and Split piston, Split piston is by piston head, work Plug skirt two, which partly welds, to be composed.Usual piston head forging uses " open die forging, impressing forging ", blank heating temperature at 1200 DEG C or so, Piston capillus bad machining allowance is big, corner R is big (general R >=3).Open type forging technology stock utilization is low, processing cost is high, visitor Complain big in family.
The advanced forging technology of piston head is " closed die forging ", but forging corner R often occurs and relatively fill discontented, filling effect Fruit is poor;For traditional cylinder ejector rod when ejecting forging, two sides force unbalance, forging occurs card mold phenomenon when being ejected, and leads Cause production line stop;Due to there is fit clearance between cylinder ejector rod and mold, usually left in forging ejection position's Boss or burr are unfavorable for the processing of later period blank;More distinct issues are that closed-die forging die life is low, and manufacturing cost is high, High-volume automatic forging is not adapted to.
Conventional piston head forging mold ejection scheme is roughly divided into two kinds: the first, using the entire lower mold core of piston head as A part of ejector pin of die set.When mandril works, entire lower mold core is ejected, and then lower mold core ejects forging.This structure design Simply, easy for installation, (R >=3) of less demanding for corner R, drag chamber not deep piston head forging can hold when being ejected Easy mold release has good applicability.But in forging process, since forging core stress is maximum, the forging that single mandril upper end is subject to Pressure is big, since single mandril outer diameter is smaller, is easy to cause single mandril to deform, and it is unsmooth to eventually lead to mandril ejection, until blocking Lower die can not be produced normally;
Such as the patent No. 201710174665.8, title are as follows: closed type single point press closed die forging mechanism discloses a kind of pressure Machine, more particularly, to a kind of closed type single point press closed die forging mechanism.It mainly solves pressure present in the prior art Each component of machine is all flat design, therefore its gap in die forging is larger, and die forging is more inaccurate, the part produced The more low technical problem of accuracy.The present invention includes mould bases, and mould bases is equipped with cope plate and lower template, and cope plate is fixed with Die shank, upper die shank are connected with forming punch by upper mold fixture nut, and forming punch includes formed punch ontology, formed punch ontology it is upper Portion is equipped with positioning ring, and formed punch ontology lower end is equipped with convex block, and the head and root of convex block are designed with arc surface, set on formed punch ontology There is bleed passage, lower template is equipped with lower die holder, wears in lower die holder and be connected to big mandril, big mandril top has by small mandril top Shape mould, finishing die outside are equipped with lower die-sleeve, are fixed on the lower die seat outside lower die-sleeve by lower die fixture nut.It is adopted in this application It is realized with a mandril, but there are discontinuity, easily-deformable problems.
Second, forging is directly ejected even more than thin mandril using two.The assembly of this mandril needs strict control The length of mandril, in order to guarantee that thin mandril is unlikely to head into forging when ejecting forging, is usually pushed up since forced area is too small The contact surface of bar and forging can remain the false boss of several certain altitudes, and this boss is unfavorable to the processing of subsequent finished product, Client cannot receive, it is necessary to be machined out processing, increase cost.
Such as Patent No.: 201710333432.8, the flexible demoulding side of the entitled large scale special-shaped structural forging of closed die forging Method discloses, and the stripper apparatus that this method uses includes at least 3 mandrils and pedestal, is equipped in the anvil tool of the die forging logical Hole, the lower end fixation of the mandril is on the base and the upper end passes through the large size in the through-hole and mold cavity of anvil tool The different bottom surfaces of polymorphic structure forging contact, and the quantity of the anvil tool through-hole is equal with the quantity of mandril, and the mandril is by upper The rigid section for holding flexible compliant section and lower end to have rigidity is constituted;
For the demoulding for being adapted to larger part, ejected simultaneously using multiple mandrils;Therefore strict control mandril is just needed Length etc., technique require high.
The information disclosed in the background technology section is intended only to increase the understanding to general background of the invention, without answering When being considered as recognizing or imply that the information constitutes the prior art already known to those of ordinary skill in the art in any form.
Summary of the invention
Technical problem to be solved by the present invention lies in: how to solve existing mold and is not able to satisfy the ejection of piston head forging The problem of technique afterwards requires.
The present invention is to solve above-mentioned technical problem by the following technical programs: the present invention is disclosed with annular compound mandril The piston head forging mold of mechanism, the mold include lower mold core, lower die-sleeve, and lower mold core is fixed in lower die-sleeve, lower mold core The inner surface of top surface and lower die-sleeve forms forming surface corresponding with piston head forging;The lower mold core bottom is equipped with post rod mechanism, The mould inside has the cavity for accommodating post rod mechanism, and cavity is to run through structure up and down;
The post rod mechanism including being successively main mandril, T-type mandril, multiple step mandrils, annular mandril, ring from the bottom to top It is piston head forging at the top of shape mandril, annular mandril is arranged in lower mold core, annular mandril and lower mold core clearance fit, step-shaped top Bar is fixedly connected with the bottom of annular mandril.
The present invention by the way that unitary mould is divided into two modular structures along mold corner by lower die, respectively lower mold core, Lower die-sleeve, the in this way region of stress concentration in elimination forging process, to significantly improve die life;And pass through multiple step-shaped tops Bar realizes many places ejection, homogenizes the ejecting force that step mandril generates further through annular mandril, and increase ejecting mechanism It with the contact surface of piston head forging, can guarantee that forging is gently ejected, demoulded, the hot forging generated by ejection can be effectively reduced and become Shape improves the quality of forging;Wherein T-type mandril can also make the ejecting force at T-type face realize homogenization.
Preferably, the mold further includes pedestal, lower mold backing plate, lower die-sleeve, and lower mold backing plate is fixed on the base, lower die-sleeve Be fixed in lower mold backing plate, lower mold core is fixed on lower die-sleeve, wherein pedestal, lower mold backing plate, receiving top is equipped in lower die-sleeve The cavity of linkage.
The forging lower mold core is fixed in lower die-sleeve, and lower die-sleeve and lower mold backing plate pass through the mould bases of tooling and fixing mould It compresses;
Mould inside is according to the link position situation with ejecting mechanism, chamber of the setting of adaptability for ejecting mechanism ejection Body, the cavity can be it is one big, such as accommodating main mandril, the cavity at T-type mandril, be also possible to it is multiple small, Such as accommodating the cavity of step mandril at lower mold core.
It preferably, further include lower die holder, ring shaped retainer member, lower die holder is fixed on the base surface, ring shaped retainer member setting At pedestal and lower die holder joint face, and pedestal and lower die holder are connected, lower mold backing plate is fixed on lower die holder upper surface, the main top Bar is arranged in the cavity of pedestal, and the vertical bar of the T-type mandril is arranged in the cavity of lower die holder, the cross of the T-type mandril Panel is limited in the upper surface of lower die holder.
Plant bottom case and lower die holder centralized positioning may be implemented in the ring shaped retainer member.
It preferably, further include multiple reset springs, reset spring is socketed in the outside of step mandril, and is limited in lower die Between core and the step surface of step mandril.
The effect of reset spring is to facilitate the reset of step mandril, ejection process after ejecting mechanism ejects forging In, reset spring is compressed, and after ejection, without ejecting force, spring has outside elastic force.
Preferably, the lower mold core is up-small and down-big stepped ramp type structure, and bottom is equipped with the depth for accommodating reset spring Hole.
Lower mold core can realize the clamping at step with lower die-sleeve, increase stability;Its deep hole is similarly stepped hole, resets Spring can be limited at the step surface of deep hole.
Preferably, the step mandril is down big up small structure, and top and annular mandril interference fit connect.
Preferably, the step mandril is four, and uniform setting is on the same circumference.
Preferably, the annular mandril is the cylindrical structure of annular, and the thickness of the one end contacted with forging is greater than and step The thickness of one end of mandril connection.Upper end thickness is big, and the gap between upper mold core inside is small, can reduce the boss of forging Residual, lower end thickness is smaller, can release in order to push rod.
Preferably, the mold further includes upper mold core, and upper mold core is mounted on the top of forging, and when forging, upper mold core is under Mold core constitutes forging space.Upper mold core is compressed by the mould bases of tooling and fixing mould.
Preferably, the main mandril is connect with hydraulic cylinder.It can guarantee that forging ejection is gentle in automatic forging, ejection Power, Traffic control system are convenient.
The present invention has the advantage that compared with prior art
(1) present invention is by being divided into two modular structures, respectively lower die for unitary mould along mold corner for lower die Core, lower die-sleeve, the in this way region of stress concentration in elimination forging process, to significantly improve die life;And pass through multiple Rank mandril realizes many places ejection, homogenizes the ejecting force that step mandril generates further through annular mandril, and increase ejection The contact surface of mechanism and piston head forging can guarantee that forging is gently ejected, demoulded, and can effectively reduce the hot forging generated by ejection Part deformation, improves the quality of forging;Wherein T-type mandril can also make the ejecting force at T-type face realize homogenization;
(2) effect of reset spring is to facilitate the reset of step mandril after ejecting mechanism ejects forging, ejected Cheng Zhong, reset spring is compressed, and after ejection, without ejecting force, spring has outside elastic force;
(3) the upper end thickness of annular mandril is big, and the gap between upper mold core inside is small, can reduce the boss of forging Residual, lower end thickness is smaller, can release in order to push rod;
(4) the main mandril is connect with hydraulic cylinder, can guarantee that forging ejection is gentle in automatic forging, ejecting force, Traffic control system is convenient.
Detailed description of the invention
Fig. 1 is the structural schematic diagram for the piston head forging mold that the embodiment of the present invention has annular compound post rod mechanism;
Fig. 2 is the enlarged drawing in Fig. 1 at A;
Fig. 3 is the cross-sectional view of annular mandril;
Fig. 4 is the top view of annular mandril.
Figure label: pedestal 1, lower die holder 2, ring shaped retainer member 3, lower mold backing plate 4, lower die-sleeve 5, lower mold core 6, ejecting mechanism 7, main mandril 71, T-type mandril 72, step mandril 73, reset spring 731, annular mandril 74, upper mold core 8, piston head forging 9.
Specific embodiment
It elaborates below to the embodiment of the present invention, the present embodiment carries out under the premise of the technical scheme of the present invention Implement, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to following implementation Example.
Embodiment one:
As shown in Figure 1 and Figure 2, the present embodiment have annular compound post rod mechanism piston head forging mold, the mold by Under it is supreme successively include pedestal 1, lower die holder 2, ring shaped retainer member 3, lower mold backing plate 4, lower die-sleeve 5, lower mold core 6, ejecting mechanism 7, Upper mold core 8;
Wherein, in the design of lower die, lower mold core 6 is fixed in lower die-sleeve 5, and the top surface of lower mold core 6 is interior with lower die-sleeve 5 Surface forms forming surface corresponding with piston head forging 9;By the way that unitary mould is divided into two moulds along mold corner by lower die Block structure, respectively lower mold core 6, lower die-sleeve 5, the in this way region of stress concentration in elimination forging process, to significantly improve mould Has the service life
The mould inside has the cavity for accommodating post rod mechanism 7, and cavity is to run through structure up and down;
Post rod mechanism 7 including being successively main mandril 71,72, four step mandrils 73 of T-type mandril, annular mandril from the bottom to top 74, it is piston head forging 9 at the top of annular mandril 74, annular mandril 74 is arranged in lower mold core 6, annular mandril 74 and lower mold core 6 Clearance fit, step mandril 73 are fixedly connected with the bottom of annular mandril 74, and main mandril 71 is to connect with T-type mandril 72, Step mandril 73 and T-type mandril 72 connect.Main mandril 71 is cylindrical mandril, and T-type mandril 72 is the knot that cross section is T-type Structure, vertical bar can be cylindrical bar, can be Circular plate structure at plane of structure, and the step mandril 73 is down big up small structure, Top and the annular interference fit of mandril 74 connect.
In conjunction with shown in Fig. 3, Fig. 4, the step mandril 73 is four, uniform to be arranged on the same circumference, corresponding, institute Annular mandril 74 is stated on the circumference of its thickness direction, if the annular mandril 74 is the cylindrical structure of annular there are four cavity, And the thickness of the one end contacted with forging is greater than the thickness of the one end connecting with step mandril, it may be assumed that upper end thickness is big, with upper mold core Gap between 6 inside is small, can reduce the residual of the boss of forging, and lower end thickness is smaller, can release in order to push rod.
Pedestal 1 is rotary table or square structure, the whole of the main mandril 71 of accommodated inside and the lower part of T-type mandril, bottom or is set There is the design of adaptability.
Lower die holder 2 is fixed on 1 upper surface of pedestal, and the setting of ring shaped retainer member 3 connects at pedestal 1 and 2 joint face of lower die holder Pedestal 1 and lower die holder 2 are connect, plant bottom case 1 and 2 centralized positioning of lower die holder may be implemented in the ring shaped retainer member 3.The T-type top The vertical bar of bar 72 is arranged in lower die holder 2 and the cavity of bottom 1, and the plane of structure plate of the T-type mandril is limited in lower die holder 2 Upper surface, upwards when top, T-type mandril is moved upwards, and can be detached from lower die holder 2, when restoring to initial position, the meeting again of T-type mandril 72 It is overlapped on the top surface of lower die holder 2.
Lower mold backing plate 4 is fixed on 2 upper surface of lower die holder, and the cavity diameter inside lower mold backing plate 4 is slightly larger than T-type mandril 72 At maximum gauge, lower die-sleeve 5 is fixed in lower mold backing plate 4, and lower die-sleeve 5 and lower mold backing plate 4 pass through the mould of tooling and fixing mould Frame compresses, and lower mold core 6 is fixed in lower die-sleeve 5, and the inner wall of the outer wall and lower die-sleeve 5 of lower mold core 6 is fastenedly connected, and the lower die Core 6 is up-small and down-big convex stepped ramp type structure, is up-small and down-big cavity in the middle part of lower die-sleeve 5, and lower die-sleeve 5 and lower mold core 6 are logical Setting step is crossed to be clamped;Lower mold core 6 be equipped with circumference array cavity, for accommodate step mandril 73 top or/and in Portion
Wherein, pedestal 1, lower die holder 2, ring shaped retainer member 3, lower mold backing plate 4, lower die-sleeve 5, be equipped with receiving in lower mold core 6 The cavity of post rod mechanism 7.
Mould inside is according to the link position situation with ejecting mechanism, chamber of the setting of adaptability for ejecting mechanism ejection Body, the cavity can be it is one big, such as accommodating main mandril 71, the cavity at T-type mandril 72, be also possible to multiple small , such as accommodating the cavity of step mandril 73 at lower mold core 6.
The mold further includes upper mold core 8, and upper mold core 8 is mounted on the top of forging 9, when forging, upper mold core 8 and lower mold core 6 constitute forging space, and upper mold core 8 is compressed by the mould bases of tooling and fixing mould.
The present invention realizes the ejection of multiple positions by four step mandrils 73, further through annular mandril 74 by step mandril 73 The ejecting force of generation is homogenized, and increases the contact surface of ejecting mechanism Yu piston head forging 9, can guarantee that forging gently pushes up Out, it demoulds, the hot forging deformation generated by ejection can be effectively reduced, improve the quality of forging;Wherein T-type mandril 72 can also make Homogenization is realized in ejecting force at T-type face.
Embodiment two:
As shown in Figure 1, the difference between this embodiment and the first embodiment lies in: the present embodiment further includes multiple reset springs 731, Reset spring 731 is socketed in the outside of step mandril 73, and the bottom of the lower mold core 6 is equipped with for accommodating reset spring 731 The cavity of deep hole, deep hole and upper part is similarly formed stepped hole, reset spring 731 and be limited at the deep hole of lower mold core 6 with Between the step surface of step mandril 73, the reset condition of reset spring 731 can be mild compression or conventional sense.
The effect of reset spring 731 is to facilitate the reset of step mandril 73 after ejecting mechanism ejects forging, ejection In the process, reset spring is compressed, and after ejection, without ejecting force, spring has outside elastic force.
It should be understood that
In above-described embodiment one and embodiment two, the main mandril 71 is connect with hydraulic cylinder.It can guarantee to forge in automation Make middle forging ejection gently, ejecting force, Traffic control system are convenient.
Annular mandril 74 can be equivalent to the ring block split along lower mold core 6 along corner, use directly as mandril, Therefore it is required that when forging, the upper surface of annular mandril 74 cooperates that collectively form the lower surface of piston head forging 9 corresponding with lower mold core 6 Forming surface, while annular mandril 74 is heat-treated, the intensive treatments such as nitriding, to enhance its intensity and wearability.
Mold assembling and installation process are as follows: frock making finishes, two first (this is sentenced for two) step mandrils 73 two reset springs 731 of assembly;Step mandril 73 is then passed through lower mold core 6, and it is corresponding to be pressed into annular mandril 74 (first preheating 350 DEG C) Interference fit is realized in hole, and two mandrils (after step mandril 72 is combined with annular mandril 74) length requirement after assembly is consistent;Most Lower mold core 6 and assembling parts are completed by drawing sequence afterwards, die craft equipment is then installed, adjusts upper and lower mold center and closing After height, mold and press bench are compressed.
Ejection process: hydraulic cylinder stretches out, and main mandril 71 moves upwards, and then realizes T-type mandril 72, step mandril 73, ring Shape mandril 74 moves upwards, and ejects piston head forging 9, ejection process, and reset spring 731 is compressed;Ejection terminates, and hydraulic cylinder is received Contracting, main mandril 71 return to initial position, and reset spring 731 has the gravity of outside elastic force and a mandril itself, realize a Mandril is restored to original position.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.

Claims (10)

1. the piston head forging mold with annular compound post rod mechanism, which is characterized in that the mold includes lower mold core, lower die Set, lower mold core is fixed in lower die-sleeve, the top surface of lower mold core and the inner surface of lower die-sleeve formed it is corresponding with piston head forging at Type face;The lower mold core bottom is equipped with post rod mechanism, and the mould inside has the cavity for accommodating post rod mechanism, and cavity is Run through structure up and down;
The post rod mechanism including being successively main mandril, T-type mandril, multiple step mandrils, annular mandril, circular top from the bottom to top Be piston head forging at the top of bar, annular mandril is arranged in lower mold core, annular mandril and lower mold core clearance fit, step mandril with The bottom of annular mandril is fixedly connected.
2. the piston head forging mold according to claim 1 with annular compound post rod mechanism, which is characterized in that described Mold further includes pedestal, lower mold backing plate, and lower mold backing plate is fixed on the base, and lower die-sleeve is fixed in lower mold backing plate, wherein bottom Seat, is equipped with the cavity for accommodating post rod mechanism in lower die-sleeve at lower mold backing plate.
3. the piston head forging mold according to claim 2 with annular compound post rod mechanism, which is characterized in that also wrap Lower die holder, ring shaped retainer member are included, lower die holder is fixed on the base surface, and ring shaped retainer member is arranged in pedestal and lower die holder joint face Place, and pedestal and lower die holder are connected, lower mold backing plate is fixed on lower die holder upper surface, and the cavity of pedestal is arranged in the main mandril Interior, the vertical bar of the T-type mandril is arranged in the cavity of lower die holder, and the plane of structure plate of the T-type mandril is limited in lower die holder Upper surface.
4. the piston head forging mold according to claim 1 with annular compound post rod mechanism, which is characterized in that also wrap Multiple reset springs are included, reset spring is socketed in the outside of step mandril, and is limited in the step of lower mold core Yu step mandril Between face.
5. the piston head forging mold according to claim 4 with annular compound post rod mechanism, which is characterized in that described Lower mold core is up-small and down-big stepped ramp type structure, and bottom is equipped with the deep hole for accommodating reset spring.
6. the piston head forging mold according to claim 1 with annular compound post rod mechanism, which is characterized in that described Step mandril is down big up small step structure, and top and annular mandril interference fit connect.
7. the piston head forging mold according to claim 1 with annular compound post rod mechanism, which is characterized in that described Step mandril is four, and uniform setting is on the same circumference.
8. the piston head forging mold according to claim 1 with annular compound post rod mechanism, which is characterized in that described Annular mandril is the cylindrical structure of annular, and the thickness of the one end contacted with forging is greater than the thickness of the one end connecting with step mandril Degree.
9. the piston head forging mold according to claim 1 with annular compound post rod mechanism, which is characterized in that described Mold further includes upper mold core, and upper mold core is mounted on the top of forging, and when forging, upper mold core and lower mold core constitute forging space.
10. the piston head forging mold according to claim 1 with annular compound post rod mechanism, which is characterized in that institute Main mandril is stated to connect with hydraulic cylinder.
CN201910677995.8A 2019-07-25 2019-07-25 Piston head forging mold with annular compound post rod mechanism Pending CN110252925A (en)

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CN110935835A (en) * 2019-12-24 2020-03-31 无锡透平叶片有限公司 Forging die structure for deep-cavity thin-wall forge piece
CN111745116A (en) * 2020-07-21 2020-10-09 郎溪浩良锻造有限公司 Forging forming device and method for excavator flange
CN111922275A (en) * 2020-06-12 2020-11-13 中煤北京煤矿机械有限责任公司 Die for machining middle cylinder piston head forging
CN112517657A (en) * 2020-10-16 2021-03-19 中北大学 Bidirectional differential extrusion forming method for outer longitudinal rib cylindrical part

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Publication number Priority date Publication date Assignee Title
CN110935835A (en) * 2019-12-24 2020-03-31 无锡透平叶片有限公司 Forging die structure for deep-cavity thin-wall forge piece
CN111922275A (en) * 2020-06-12 2020-11-13 中煤北京煤矿机械有限责任公司 Die for machining middle cylinder piston head forging
CN111745116A (en) * 2020-07-21 2020-10-09 郎溪浩良锻造有限公司 Forging forming device and method for excavator flange
CN112517657A (en) * 2020-10-16 2021-03-19 中北大学 Bidirectional differential extrusion forming method for outer longitudinal rib cylindrical part
CN112517657B (en) * 2020-10-16 2022-04-08 中北大学 Bidirectional differential extrusion forming method for outer longitudinal rib cylindrical part

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