CN110355312A - Interior hexagonal cold-forging forming mold and technique in a kind of cup shell - Google Patents
Interior hexagonal cold-forging forming mold and technique in a kind of cup shell Download PDFInfo
- Publication number
- CN110355312A CN110355312A CN201910629965.XA CN201910629965A CN110355312A CN 110355312 A CN110355312 A CN 110355312A CN 201910629965 A CN201910629965 A CN 201910629965A CN 110355312 A CN110355312 A CN 110355312A
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- punch
- blank
- cavity
- hexagon
- forming
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000010273 cold forging Methods 0.000 title claims description 29
- 238000001125 extrusion Methods 0.000 claims abstract description 11
- 230000000712 assembly Effects 0.000 claims abstract description 10
- 238000000429 assembly Methods 0.000 claims abstract description 10
- 238000003825 pressing Methods 0.000 claims description 9
- 230000004308 accommodation Effects 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims description 6
- 239000011574 phosphorus Substances 0.000 claims description 6
- 238000007127 saponification reaction Methods 0.000 claims description 6
- 230000002035 prolonged effect Effects 0.000 claims description 4
- 238000007493 shaping process Methods 0.000 claims description 4
- 238000000137 annealing Methods 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000005422 blasting Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 238000002203 pretreatment Methods 0.000 claims description 3
- 230000003746 surface roughness Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 238000007781 pre-processing Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 238000005242 forging Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 230000037237 body shape Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/08—Accessories for handling work or tools
- B21J13/14—Ejecting devices
-
- 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
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
- B21J5/025—Closed die forging
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The present invention provides a kind of molds of hexagonal interior in cup shell forming, including upper die component and lower mold assemblies, top mold holder component includes that top mold holder and the upper punch being installed in top mold holder and annular punch, upper punch are threaded through in annular punch, and the end sections of upper punch, which protrude from, changes shape formed punch；Lower mold holder component includes lower mold holder, the cavity plate and inter-hexagon punch that are installed on lower mold holder, cavity plate is located at the top of inter-hexagon punch, cavity plate is equipped with the die cavity matched with upper punch, upper punch and cavity plate mutual cooperation extrusion billet form the side wall and cavity of workpiece, and upper punch and inter-hexagon punch match the interior hexagonal that extrusion billet forms workpiece.The present invention also provides a kind of techniques using above-mentioned mold.The present invention shape in hexagonal when need to reach the region of certain degree of hardness and be enclosed in that type is intracavitary, using the extruding force of formed punch to the region imposed deformation, make up to the hardness of needs.
Description
Technical field
The invention belongs to cold-forging technique and mold, be more particularly in a kind of cup shell interior hexagonal cold-forging forming technique and its
Mold.
Background technique
Shape cannot be sufficient, with the indeformable association area of interior hexagonal in forming process for hexagonal forging in existing cup shell
Hardness is beaten less than requiring, and workpiece cannot be heat-treated adjustment hardness.
Summary of the invention
Interior hexagonal configuration abundance, associated region hardness on forging can be made to reach requirement the object of the present invention is to provide a kind of
Interior hexagonal cold-forging forming technique and its mold in cup shell.
According to an aspect of the invention, there is provided the mold that interior hexagonal shapes in a kind of cup shell, including upper die component
And lower mold assemblies,
The top mold holder component includes top mold holder and the upper punch that is installed in the top mold holder and annular punch, it is described on
Formed punch is threaded through in the annular punch, and the end sections of the upper punch, which protrude from, described changes shape formed punch；
The lower mold holder component includes lower mold holder, the cavity plate and inter-hexagon punch that are installed on the lower mold holder, described recessed
Mould is located at the top of the inter-hexagon punch, and the cavity plate is equipped with the die cavity matched with the upper punch, the upper punch and
The cavity plate mutual cooperation extrusion billet forms the side wall and cavity of workpiece, and the upper punch and the inter-hexagon punch match
The interior hexagonal of extrusion billet formation workpiece.
In some embodiments, the upper die component further include:
Upper Die-sleeve, the vertical direction that its side wall is prolonged in end are outward extended with fixed ring, and the fixed ring is solid by screw
It is scheduled in the top mold holder；
Formed punch set is set in outside the annular punch with the fixation annular punch, and the formed punch set is pre- by simultaneously cap
Tightly on the Upper Die-sleeve.
In some embodiments, the lower mold assemblies further include:
Lower die-sleeve is bolted to connection on the lower mold holder；
Guide sleeve is set on the cavity plate with the fixation cavity plate, and the guide sleeve and the cavity plate pass through seam allowance
Connection, the guide sleeve are arranged with pressing plate outside, and the pressing plate is connect by bolt with the lower die-sleeve；
Inter-hexagon punch fixing seat is mounted on the lower mold holder, is set on the inter-hexagon punch to fix
State inter-hexagon punch.
In some embodiments, the lower mold assemblies further include bottom knockout bar, stripping attachment fixing seat, fill block, the upper material returned
Device and lower stripping attachment,
The upper stripping attachment is mounted in the inter-hexagon punch fixing seat, and the upper stripping attachment is located at the interior hexagonal stamping
Between head fixing seat and the bottom of the blank, the end of the upper stripping attachment and the bottom of workpiece offset；
The through-hole that the bottom knockout bar passes through the lower mold holder is connect with the fill block, the fill block and the lower stripping attachment
Connection, the stripping attachment fixing seat are mounted in lower die-sleeve, in the lower stripping attachment installation stripping attachment fixing seat, the lower material returned
The end of device and the bottom of workpiece offset.
According to another aspect of the present invention, interior hexagonal cold-forging forming technique in a kind of cup shell is provided, use is above-mentioned
Interior hexagonal cold-forging forming mold is by blank cold-forging forming in cup shell, as the upper die component is gradually moved to the lower mold assemblies
It is dynamic:
The upper punch and the cavity plate cooperate, and extrusion billet forms the cavity and side wall of workpiece；
Under the action of the formed punch and the inter-hexagon punch, by the bottom on blank squeeze into the upper punch hexagonal at
Shape is intracavitary, and as forming carries out, hexagonal forming cavity is full of blank in the upper punch, forms the hexagon socket head cap screw of workpiece；
When workpiece and upper stripping attachment touch, the upper punch, the cavity plate and the inter-hexagon punch form first
Hemi-closure space, the annular punch, cavity plate and upper punch form the second hemi-closure space, are equipped between two hemi-closure spaces
Blank accommodation space, under the action of two hemi-closure spaces, extruding force can allow hexagonal forming cavity in the upper punch to squeeze foot, more
Remaining material is squeezed along the semiclosed mouth of two hemi-closure spaces to blank accommodation space, until squeezing terminates.
In some embodiments, further include shaping preceding pretreatment before forming technology, before the forming pretreatment include:
High annealing removes blank internal stress, controls the Oxygen potential of blank, improve deformed hardness；
The shape of needs is made in blank by base, controls the weight and surface roughness of blank；
Ball blast, to blank surface Shot Blasting in order to the attachment of phosphorus, saponification layer；
Pre-treatment, blank surface covers phosphorus, saponification layer is convenient for cold-forging forming.
In some embodiments, the bottom of the blank before hexagon socket head cap screw forming is equipped with to its cavity
The boss of inner recess flows the loss to be formed to non-close region when making up the forming of interior hexagonal.
In some embodiments, the small boss of blank upper bottom portion is squeezed into the upper punch in hexagonal forming cavity, with
Forming carry out, hexagonal forming cavity is full of blank in the upper punch, forms the hexagon socket head cap screw of workpiece.
It has the advantage that: the present invention shape in hexagonal when need to reach region intracavitary, the benefit that is enclosed in type of certain degree of hardness
With the extruding force of formed punch to the region imposed deformation, the hardness of needs is made up to；
The present invention by interior hexagonal shape before blank special shape is made, the shape can make up interior hexagonal forming when to
Flow the loss to be formed in non-close region；
Interior hexagonal of the oral area of workpiece made of the present invention with chamfering is to forge, full appearance；Cup shell ground warp
Extruding, inside and outside smooth is crossed, R is angular to meet the requirements；At the angle R, interior hexagonal, baseplane pass through forging extruding, hardness meets the requirements.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of interior hexagonal cold-forging forming mold in a kind of cup shell of an embodiment of the present invention；
Fig. 2 is that the first hemi-closure space, the second hemi-closure space and the blank of the mold and blank formation in Fig. 1 accommodate sky
Between structural schematic diagram；
Fig. 3 is the knot of workpiece obtained by interior hexagonal cold-forging forming technique in a kind of cup shell of an embodiment of the present invention
Structure schematic diagram；
Fig. 4 is the knot of blank used in interior hexagonal cold-forging forming technique in a kind of cup shell of an embodiment of the present invention
Structure schematic diagram.
Specific embodiment
Following further describes the present invention with reference to the drawings.
Fig. 1 and Fig. 2 schematically shows interior hexagonal cold-forging forming mold in the cup shell of one embodiment of the present invention.
As depicted in figs. 1 and 2, interior hexagonal cold-forging forming mold in the cup shell, including upper die component and lower mold assemblies.
Top mold holder component includes top mold holder and the upper punch being installed in top mold holder 6 and annular punch 5.Annular punch set
4 set outside upper punch 6, and the end of upper punch 6 protrudes from annular punch 5, form workpiece with extrusion billet.Top mold holder component further includes
Upper Die-sleeve 2,2 pressure block 1 of Upper Die-sleeve, formed punch cover 4 and simultaneously cap 3.The vertical direction that its side wall is prolonged in the end of Upper Die-sleeve 2 extends outwardly
There is fixed ring, fixed ring is fixed by screws in top mold holder.The fixation of 2 pressure block 1 of Upper Die-sleeve is threaded through in Upper Die-sleeve 2, thereon
Surface and the bottom of top mold holder fit.Annular punch 5 is mounted in formed punch set 4.The top of formed punch set 4 and 2 pressure of Upper Die-sleeve
The bottom of block 1 offsets.And cap 3, it is ring body shape, the vertical direction that its side wall is prolonged in bottom extends internally and has snap ring；Formed punch set 4 is logical
It crosses and cap 3 pre-tightens on Upper Die-sleeve 2.
Lower mold holder component includes that lower mold holder, the cavity plate being installed on lower mold holder 7 and 10 cavity plate 7 of inter-hexagon punch are located at interior six
The top of angle formed punch 10.Cavity plate 7 is equipped with the die cavity matched with upper punch 6,7 mutual cooperation extrusion billet of upper punch 6 and cavity plate
The side wall and cavity of workpiece are formed, upper punch 6 and inter-hexagon punch 10 match the interior hexagonal that extrusion billet forms workpiece.Lower die
Component further includes guide sleeve, pressing plate 8, inter-hexagon punch fixing seat 11, lower die-sleeve 12,12 pressure block of lower die-sleeve, locating ring 16, fills out
Block 17, upper stripping attachment 9, lower stripping attachment 14, stripping attachment fixing seat 13 and bottom knockout bar 18.Guide sleeve is set in outside cavity plate 7, guiding
Set and cavity plate 7 are through the joint of the seam allowance.The lateral wall of guide sleeve is equipped with step, and pressing plate 8 is ring body shape, is arranged with pressing plate at step
8.Pressing plate 8 is connect by hexagon socket head cap screw with lower die-sleeve 12.The both ends of lower die-sleeve 12 be equipped with prolong the vertical direction of its side wall to
The connection ring of the connection ring of outer extension, 12 one end of lower die-sleeve is connect by bolt with pressing plate 8, the connection of the other end of lower die-sleeve 12
Ring is connect by bolt with lower mold holder.Inter-hexagon punch 10 is mounted in inter-hexagon punch fixing seat 11, with fixed interior hexagonal stamping
First 10.The end of inter-hexagon punch 10 protrudes from inter-hexagon punch fixing seat 11, to match to form interior hexagonal with upper punch 6.
Inter-hexagon punch fixing seat 11 is mounted in lower die-sleeve 12.Lower mold holder is equipped with through-hole.Bottom knockout bar 18 passes through the through-hole of lower mold holder
It is connect with fill block 17.Fill block 17 is mounted in 12 pressure block of lower die-sleeve.It is fixed to be equipped between 12 pressure block of lower die-sleeve and lower die-sleeve 12
Position circle 16.Fill block 17 is connect with lower stripping attachment 14.Upper stripping attachment 9 is mounted in inter-hexagon punch fixing seat 11.Upper stripping attachment 9
Between inter-hexagon punch fixing seat 11 and the bottom of blank, for resisting the bottom of workpiece.Lower stripping attachment 14 is mounted on the material returned
In device fixing seat 13.The end of lower stripping attachment 14 and the bottom of workpiece offset, for ejecting the workpiece of forming.Stripping attachment fixing seat
13 upper surface and the lower end surface of inter-hexagon punch fixing seat 11 fit.It is equipped with down between stripping attachment fixing seat 13 and lower mold holder
12 pressure block of die sleeve.One end of 12 pressure block of lower die-sleeve offsets with stripping attachment fixing seat 13, the other end of 12 pressure block of lower die-sleeve
It offsets with lower mold holder.
Interior hexagonal cold-forging forming technique in a kind of cup shell, using hexagonal cold-forging forming mold interior in above-mentioned cup shell by base
Expect cold-forging forming, as membrane module is mobile gradually downward for upper die component: upper punch 6 and cavity plate 7 cooperate, and extrusion billet is formed
The cavity and side wall of workpiece；Under the action of formed punch and inter-hexagon punch 10, by the bottom on blank squeeze into upper punch 6 hexagonal at
Shape is intracavitary, and as forming carries out, hexagonal forming cavity is full of blank in upper punch 6, forms the interior hexagonal of workpiece；When workpiece and above move back
When glassware 9 touches, upper punch 6, cavity plate 7 and inter-hexagon punch 10 form the first hemi-closure space 201, annular punch 5, cavity plate
7 and upper punch 6 form the second hemi-closure space 202, blank accommodation space 203 is equipped between two hemi-closure spaces, blank
The small―gap suture being equipped between side wall and the inner wall of cavity plate 7 is blank accommodation space 203.Under the action of two hemi-closure spaces,
Extruding force can allow in upper punch 6 hexagonal forming cavity to squeeze foot, and extra material is along the semiclosed mouth of two hemi-closure spaces to blank
Accommodation space squeezes, until squeezing terminates, it is as shown in Figure 3 to squeeze resulting workpiece.As shown in figure 4, six in workpiece bottom
The bottom of blank before the forming of angle is equipped with the boss 19 being recessed to its inside cavity, to non-close when making up the forming of interior hexagonal
Flow the loss to be formed in region.The small boss 19 of blank upper bottom portion is squeezed into upper punch 6 in hexagonal forming cavity, with shape into
It goes, hexagonal forming cavity is full of blank in upper punch 6, forms the interior hexagonal of workpiece.The side wall of the workpiece of forming and the connection of bottom
Place is rounded corner R, after forging the angle R, at interior hexagonal, the hardness of baseplane meet the requirements, hardness >=80HRB.
It further include shaping preceding pretreatment before forming technology, pretreatment includes: high annealing before shaping, and removes and answers in blank
Power controls the Oxygen potential of blank, improves deformed hardness；The shape of needs is made in blank by base, controls the weight of blank
And surface roughness；Ball blast, to blank surface Shot Blasting in order to the attachment of phosphorus, saponification layer；Pre-treatment, blank surface covering
Phosphorus, saponification layer are convenient for cold-forging forming.
Above-described is only some embodiments of the present invention, for those of ordinary skill in the art, is not being taken off
Under the premise of from the invention design, various modifications and improvements can be made, and these are all within the scope of protection of the present invention.
Claims (8)
1. interior hexagonal cold-forging forming mold in a kind of cup shell, which is characterized in that including upper die component and lower mold assemblies,
The top mold holder component includes top mold holder and the upper punch being installed in the top mold holder and annular punch, the upper punch
It is threaded through in the annular punch, the end sections of the upper punch, which protrude from, described changes shape formed punch；
The lower mold holder component includes lower mold holder, the cavity plate and inter-hexagon punch that are installed on the lower mold holder, the cavity plate position
In the top of the inter-hexagon punch, the cavity plate is equipped with the die cavity that matches with the upper punch, the upper punch and described
Cavity plate mutual cooperation extrusion billet forms the side wall and cavity of workpiece, and the upper punch and the inter-hexagon punch match extruding
The interior hexagonal of blank formation workpiece.
2. interior hexagonal cold-forging forming mold in cup shell according to claim 1, which is characterized in that the upper die component is also
Include:
Upper Die-sleeve, the vertical direction that its side wall is prolonged in end are outward extended with fixed ring, and the fixed ring is fixed by screws in
In the top mold holder；
Formed punch set is set in outside the annular punch with the fixation annular punch, and the formed punch set is pre-tightened by simultaneously cap to exist
On the Upper Die-sleeve.
3. interior hexagonal cold-forging forming mold in cup shell according to claim 1, which is characterized in that the lower mold assemblies are also
Include:
Lower die-sleeve is bolted to connection on the lower mold holder；
Guide sleeve is set on the cavity plate with the fixation cavity plate, the guide sleeve and the cavity plate through the joint of the seam allowance,
Pressing plate is arranged with outside the guide sleeve, the pressing plate is connect by bolt with the lower die-sleeve；
Inter-hexagon punch fixing seat is mounted on the lower mold holder, is set on the inter-hexagon punch described interior with fixation
Hexagonal punch pin.
4. interior hexagonal cold-forging forming mold in cup shell according to claim 1, which is characterized in that the lower mold assemblies are also
Including bottom knockout bar, stripping attachment fixing seat, fill block, upper stripping attachment and lower stripping attachment,
The upper stripping attachment is mounted in the inter-hexagon punch fixing seat, and it is solid that the upper stripping attachment is located at the inter-hexagon punch
Between reservation and the bottom of the blank, the end of the upper stripping attachment and the bottom of workpiece offset；
The through-hole that the bottom knockout bar passes through the lower mold holder is connect with the fill block, and the fill block and the lower stripping attachment connect
It connecing, the stripping attachment fixing seat is mounted in lower die-sleeve, in the lower stripping attachment installation stripping attachment fixing seat, the lower stripping attachment
End and the bottom of workpiece offset.
5. interior hexagonal cold-forging forming technique in a kind of cup shell, which is characterized in that use cup described in any one of claims 1-6
Physically interior hexagonal cold-forging forming mold is by blank cold-forging forming, as the upper die component is gradually moved to the lower mold assemblies
It is dynamic:
The upper punch and the cavity plate cooperate, and extrusion billet forms the cavity and side wall of workpiece；
Under the action of the formed punch and the inter-hexagon punch, hexagonal forming cavity in the upper punch is squeezed into the bottom on blank
Interior, as forming carries out, hexagonal forming cavity is full of blank in the upper punch, forms the hexagon socket head cap screw of workpiece；
When workpiece and upper stripping attachment touch, the upper punch, the cavity plate and the inter-hexagon punch form the first half envelopes
Space is closed, the annular punch, cavity plate and upper punch form the second hemi-closure space, be equipped with blank between two hemi-closure spaces
Accommodation space, under the action of two hemi-closure spaces, extruding force can allow hexagonal forming cavity in the upper punch to squeeze foot, extra
Material is squeezed along the semiclosed mouth of two hemi-closure spaces to blank accommodation space, until squeezing terminates.
6. interior hexagonal cold-forging forming technique in cup shell according to claim 5, which is characterized in that before forming technology also
Including pre-processing before shaping, pretreatment includes: before the forming
High annealing removes blank internal stress, controls the Oxygen potential of blank, improve deformed hardness；
The shape of needs is made in blank by base, controls the weight and surface roughness of blank；
Ball blast, to blank surface Shot Blasting in order to the attachment of phosphorus, saponification layer；
Pre-treatment, blank surface covers phosphorus, saponification layer is convenient for cold-forging forming.
7. interior hexagonal cold-forging forming technique in cup shell according to claim 6, which is characterized in that in the interior hexagonal spiral shell
The bottom of the blank before bolt forming is equipped with the boss being recessed to its inside cavity, to make up interior hexagonal forming Shi Xiangfei envelope
Closed region flows the loss to be formed.
8. interior hexagonal cold-forging forming technique in cup shell according to claim 7, which is characterized in that by blank upper bottom portion
Small boss is squeezed into the upper punch in hexagonal forming cavity, and as forming carries out, hexagonal forming cavity is full of base in the upper punch
Material, forms the hexagon socket head cap screw of workpiece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910629965.XA CN110355312B (en) | 2019-07-12 | 2019-07-12 | Cold forging forming process for inner hexagon on cup-shaped body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910629965.XA CN110355312B (en) | 2019-07-12 | 2019-07-12 | Cold forging forming process for inner hexagon on cup-shaped body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110355312A true CN110355312A (en) | 2019-10-22 |
| CN110355312B CN110355312B (en) | 2024-05-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910629965.XA Active CN110355312B (en) | 2019-07-12 | 2019-07-12 | Cold forging forming process for inner hexagon on cup-shaped body |
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| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111299489A (en) * | 2020-03-13 | 2020-06-19 | 张巧 | Semi-closed forging die for forge pieces |
| CN116475258A (en) * | 2023-06-15 | 2023-07-25 | 陕西长羽航空装备股份有限公司 | Large titanium alloy deep cylinder back extrusion forging equipment and method for aviation aircraft |
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| CN1864915A (en) * | 2006-06-13 | 2006-11-22 | 中北大学 | A labor-saving automobile hub forming method and device |
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| Publication number | Publication date |
|---|---|
| CN110355312B (en) | 2024-05-31 |
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