CN106238486A - A kind of slender member revolving die backward extrusion carefully brilliant shaping dies and manufacturing process - Google Patents
A kind of slender member revolving die backward extrusion carefully brilliant shaping dies and manufacturing process Download PDFInfo
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- CN106238486A CN106238486A CN201610681623.9A CN201610681623A CN106238486A CN 106238486 A CN106238486 A CN 106238486A CN 201610681623 A CN201610681623 A CN 201610681623A CN 106238486 A CN106238486 A CN 106238486A
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- 238000001125 extrusion Methods 0.000 title claims abstract description 55
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 238000007493 shaping process Methods 0.000 title claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 14
- 239000013078 crystal Substances 0.000 claims abstract description 11
- 230000000694 effects Effects 0.000 claims abstract description 6
- 230000003068 static effect Effects 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 2
- 238000010008 shearing Methods 0.000 claims 1
- 229910000851 Alloy steel Inorganic materials 0.000 abstract description 7
- 229910000838 Al alloy Inorganic materials 0.000 abstract description 6
- 229910000881 Cu alloy Inorganic materials 0.000 abstract description 5
- 229910000861 Mg alloy Inorganic materials 0.000 abstract description 4
- 238000013461 design Methods 0.000 description 18
- 238000005242 forging Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 229910000967 As alloy Inorganic materials 0.000 description 1
- 241001133184 Colletotrichum agaves Species 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 1
- 229910052683 pyrite Inorganic materials 0.000 description 1
- 239000011028 pyrite Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C25/00—Profiling tools for metal extruding
- B21C25/02—Dies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
- B21C23/20—Making uncoated products by backward extrusion
- B21C23/205—Making products of generally elongated shape
Abstract
The invention discloses a kind of slender member revolving die backward extrusion carefully brilliant manufacturing process and mould, including upper die structure and lower die structure, its process is, is first placed in concave die cavity by blank, then in the active mould axially opposed motion of effect lower punch, blank generation plastic deformation is made；After punch work strip region is completely into blank inside, while the axially opposed motion of punch, along extruding center axle rotary motion, after left and right insert contacts with limit for height block, left and right insert is slided in punch the most relatively, makes blank that continuous rotary squeezing fine crystal deformation to occur.The present invention can be greatly reduced shaping load, strengthens the stability of punch, improves punch draw ratio, it is adaptable to the slender member figuration manufacture of the multiple materials such as copper alloy, aluminium alloy, magnesium alloy, steel alloy, and shortened process improves slender member manufacturing property.
Description
Technical field
The present invention relates to a kind of slender member revolving die backward extrusion carefully brilliant manufacturing process and mould.
Background technology
Along with the fast development of high-end equipment manufacture, product structure maximization, integration, high-performance, low cost become
For general character development trend, elongated blind hole component manufacture material relates to the multiple materials such as copper alloy, aluminium alloy, magnesium alloy, steel alloy,
Its draw ratio is more and more longer, beyond the ability category of conventional molding techniques, according to the experience of conventional backward extrusion, fine aluminium backward extrusion
Draw ratio≤7 of part, draw ratio≤5 of red copper backward extrusion part, draw ratio≤4 of pyrite backward extrusion part, mild steel backward extrusion part
Draw ratio≤3, if the draw ratio of backward extrusion part is excessive, exceed the flexural stress of punch, then extrusion process convex mould is easy
" drift about ", deviate extruding center axle, more seriously cause punch bending to fracture.For big L/D ratio component, adopt at present more
By punching, the technique of pulling, but the manufacturing process flow of this technique is long, and heating times is many, blank crystal grain refinement limited in one's ability.
Summary of the invention
It is an object of the invention to provide a kind of slender member revolving die backward extrusion carefully brilliant shaping dies and manufacturing process.
To achieve these goals, by the following technical solutions.
A kind of slender member revolving die backward extrusion carefully brilliant shaping dies, it is characterised in that described mould includes: upper die structure and
Lower die structure, wherein upper die structure includes upper shell, is provided with insert in upper shell, is provided with convex on the inwall of upper shell
Rising, be provided with respective slot on the outer wall of insert, upper shell inner wall lower is provided with shoulder hole, and the upper surface of insert is provided with
The bucking ladder corresponding with shoulder hole；The upper surface of upper shell is provided with two relative gear rings, and gear ring is fixed by axostylus axostyle
In top cylinder body wall, the centre of two gear rings is provided with the punch case being meshed with gear ring, the top of punch by key with
Punch case interference fit so that the rotation of punch case can drive the rotation of punch；
Lower die structure includes lower shell, and the top of lower shell has bottom plate, and the bottom of lower shell has lower bolster, under
The bottom of cylinder is provided with lower bolster, and lower bolster is provided with die, is provided with pre-answering between groove and the inwall of lower shell
Power circle, push rod is positioned at the bottom of lower shell after passing lower bolster and lower bolster；
Being provided with support bar on bottom plate, the head of support bar is provided with limit for height block, the bottom of insert be provided with
The blind hole that limit for height block is corresponding.
Insert outer surface has 4 uniform through-hole grooves, and symmetry is split into left insert and right insert, left insert and right edge
Block and punch matched in clearance, and the boss matched in clearance uniform with upper shell inner surface 4, prevent turning of left insert and right insert
Dynamic, ensure left insert and the axially-movable of right insert simultaneously.
Die inner surface has interior cone angle.
4 uniform limit for height blocks on die, limit for height block can rotate along its support bar axis, has the left edge of promotion
Block, the function of right insert axially-movable, have the function of dnockout concurrently simultaneously.
Actively mould can be that upper mold, i.e. upper mold are suppressed downwards along axis, and lower mold axial location is static；Actively mould can also be
Lower mold, i.e. lower mold are upwards suppressed along axis, and upper mold axial location is static.
A kind of manufacturing process using above-mentioned slender member revolving die backward extrusion carefully brilliant shaping dies, it is characterised in that left
Motor drives general power P of transmissionLeft(KW) ,/right motor drives general power P of transmissionRight(KW) with the ratio of rotating speed n (rad/min)
ValueWherein η is power transfer efficiency；[τ] is the maximum twist shear stress that punch material bears
(Pa)；D is convex mould diameter (m).
First blank is placed in concave die cavity, then in the active mould axially opposed motion of effect lower punch, makes blank
There is plastic deformation；After punch work strip region is completely into blank inside, while the axially opposed motion of punch, along squeezing
Pressure central shaft rotary motion, after left and right insert contacts with limit for height block, left and right insert is slided in punch the most relatively, makes blank
There is continuous rotary squeezing fine crystal deformation.
Punch, along the implementation method of extruding center axle rotary motion, is to be driven by left and/or right motor to drive a left side respectively
And/or right gear circle rotates, left and/or right gear ring is engaged by gear and drives punch case to rotate, and punch case is by uniformly dividing
The key block of cloth drives punch rotary motion, uses interference fit between key block and punch case and punch.
As the maximum distortion stress σ under blank dutycr＞ α σsTime, punch L1The allowable maximum draw ratio of section isPunch L2The allowable maximum draw ratio of section isWhen blank work
Make the maximum distortion stress σ under statecr≤ασsTime, punch L1The allowable maximum draw ratio of section isPunch
L2The allowable maximum draw ratio of section is
Wherein E is the elastic modelling quantity (Pa) of punch material, σsFor the limiting yield stress (Pa) under punch duty, d
For convex mould diameter (m), α is bending-buckling coefficient；σcrFor the maximum distortion stress (Pa) under blank duty, K1And K2For peace
Overall coefficient, punch L1The safety coefficient K of section1≤ 0.8, punch L2The safety coefficient K of section2≤ 0.6, and K1More than K2。
Punch end face has 3～4 uniform protruding list structures, the peak torque that punch bearsWherein [τ] is the maximum twist shear stress (Pa) that punch material bears, and δ is safety coefficient；
D is convex mould diameter (m)；During rotary punch backward extrusion, the protruding list structure of punch end face embeds inside blank, and makes
There is violent plastic deformation, crystal grain thinning in blank surface region.
The present invention, by design rotary punch backward extrusion technology and mould, compared with conventional backward extrusion technology, is greatly reduced
The load of punch carrying and unitstress；By designing the protruding list structure of punch end face, refine blank crystal grain；By design
Slip insert, in punch zone line axially-movable, strengthens the stability of punch, is conducive to improving punch draw ratio, it is adaptable to copper
The slender member figuration manufacture of the multiple materials such as alloy, aluminium alloy, magnesium alloy, steel alloy, shortened process, improves elongated structure
Part manufacturing property.
Figure of description
Fig. 1 is revolving die backward extrusion carefully brilliant shaping dies schematic diagram in the present invention；
Fig. 2 is punch structure schematic diagram；
Fig. 3 is punch rotary drive schematic diagram；
Fig. 4 is overall insert structure schematic diagram；
Fig. 4 A is the profile of the A-A along Fig. 4；
Fig. 4 B is the profile of B-B along Fig. 4；
Fig. 5 is upper shell structural representation；
Fig. 5 A is the profile of the A-A along Fig. 5；
Fig. 5 B is the profile of B-B along Fig. 5；
Fig. 6 is limit for height block structure schematic diagram；
Fig. 7 be punch end face be boss structure schematic diagram；
Fig. 8 be punch end face be groove structure schematic diagram；
Fig. 9 is alloy steel forging axial load and displacement relation figure；
Figure 10 is alloy steel forging revolving die backward extrusion moment of torsion and displacement relation figure；
Figure 11 is aluminum alloy forge piece axial load and time chart；
Figure 12 is aluminum alloy forge piece revolving die backward extrusion moment of torsion and time chart；
Figure 13 is copper alloy forging axial load and time chart；
Figure 14 is copper alloy forging revolving die backward extrusion moment of torsion and time chart；
In figure, 1 left motor；2 cope match-plate patterns；3 upper mounted plates；4 left gear circles；5 left axostylus axostyles；6 punch cases；
7 upper shells；8 left inserts；9 punch；10 bottom plates；11 lower shells；12 shrink rings；13 dies；
14 push rods；15 lower bolsters；16 lower bolsters；17 upper padding plates；18 left ball bearings；19 thrust bearings；20 key blocks；
21 right motors；22 right gear circles；23 right axostylus axostyles；24 right ball bearings；25 right inserts；26 packing rings；27 limits for height
Block；28 support bars；29 blanks.
Detailed description of the invention
Below in conjunction with example, the invention will be further described.
First according to geometry and the material of product, design revolving die backward extrusion total deformation, formulate corresponding forging drawing,
Calculate during revolving die backward extrusion the parameters such as axial load, axial stress, horizontal load, horizontal stress, moment of torsion, on this basis
Manufacture and design revolving die indirect-extrusion mould, and appraise and decide punch material and performance, motor type, lubricating system, dress feeding and discharging side
Formulas etc., are then arranged on revolving die indirect-extrusion mould in hydraulic press, then are placed in concave die cavity by blank, under active mould effect
The axially opposed motion of punch, makes blank generation plastic deformation；After punch work strip region is completely into blank inside, punch
While axially opposed motion, along extruding center axle rotary motion, after left and right insert contacts with limit for height block, left and right insert exists
Punch slides the most relatively, makes blank that continuous rotary squeezing fine crystal deformation to occur.
Embodiment 1
(1) product material is steel alloy, and product endoporus draw ratio is 5.1, the forging diameter of bore Φ 35mm of this design, interior
Hole depth 168mm.
(2) on the basis of product forging drawing, conventional backward extrusion (i.e. punch is the most axially movable) is devised, revolving die is counter squeezes
Press two kinds of techniques, devise punch end face be boss structure (such as Fig. 7), punch end face be two kinds of structures of groove structure (such as Fig. 8),
Compacting motion is upper mold active, lower mold actively two ways, such scheme carries out result such as Fig. 9 of simulation analysis, Ke Yifa
Existing revolving die backward extrusion is compared with conventional backward extrusion, and axial load is greatly reduced, and punch end face is that the structure of boss compares groove simultaneously
Structure is the most laborsaving, and upper mold is actively and lower mold mode actively is little to axial loading effect.It is boss according to punch end face
Structure, calculates revolving die backward extrusion maximum load 500000N, and the punch unitstress that school is calculated is 520MPa.
(3) manufacturing and designing revolving die indirect-extrusion mould, design punch end face is boss structure, punch material selection H13 steel, its
Yield stress σ under quenching+tempering process statesFor 1460MPa, elastic modulus E is 210GPa, and bending-buckling coefficient chooses α
=0.57, the ratio of the maximum twist shear stress that punch material bears and punch material limits yield stress chooses 0.6, then count
Calculation obtains punch L1The allowable maximum draw ratio of section is 6.1, punch L2The allowable maximum draw ratio of section is 4.5, punch design of material
The peak torque born is 7001794N mm, and the actual peak torque born of revolving die Back Extrusion Punches is about 2800000N
Mm (such as Figure 10), it is possible to ensure the stability of punch design.The left insert of design and right insert and punch matched in clearance, and with upper
The boss matched in clearance that cylinder inner surface 4 is uniform, prevents left insert and the rotation of right insert, ensures left insert and right edge simultaneously
The axially-movable of block.Design actively mould can be upper mold, it is also possible to is lower mold, and is arranged in hydraulic test by mould.
(4) blank heating to 1000 ± 10 DEG C, concave die cavity and punch work strip coating graphitic lubricant, mould preheating temperature
Degree is 300 DEG C, is placed in concave die cavity by blank, and die inner surface is designed with the interior cone angle of 0.1 °, and punch land length is
5mm, at upper mold actively mould effect lower punch 15mm axially movable, makes blank generation plastic deformation, and then left/right motor drives
Driving left/right gear ring to rotate respectively, left/right gear ring drives punch case to rotate by gear engagement, and punch case is by uniformly
The key block of distribution drives punch rotary motion, uses interference fit so that punch is vertically between key block and punch case and punch
While relative motion, along extruding center axle rotary motion, after left and right insert contacts with limit for height block, left and right insert is in punch
The most relatively slide, make blank that continuous rotary squeezing fine crystal deformation to occur, obtain designed forging.With conventional backward extrusion phase
Ratio, this technique significantly improves forging combination property.
Embodiment 2
(1) product material is 7A04, and product endoporus draw ratio is 8.3, designs the diameter of bore Φ 35mm of forging, interior hole depth
280mm。
(2) design same process program and carry out simulation analysis, result such as Figure 11, revolving die backward extrusion and conventional backward extrusion phase
Ratio, axial load is greatly reduced；It is the structure of boss according to punch end face, calculates revolving die backward extrusion maximum load 200000N, school
The punch unitstress calculated is 208MPa, and the actual peak torque born of punch is 1200000N mm (such as Figure 12), punch material
Material is chosen H13 steel and be ensure that the stability of punch design.
(3) by blank heating to 410 ± 5 DEG C, concave die cavity and punch work strip coating graphitic lubricant, mould preheating temperature
Degree is 300 DEG C, is placed in concave die cavity by blank, and die inner surface is designed with the interior cone angle of 0.1 °, is become by revolving die backward extrusion
Shape, the 7A04 forging crystal grain obtained is tiny, distribution uniform.
Embodiment 3
(1) product material is ormolu, and product endoporus draw ratio is 5.6, the forging diameter of bore Φ 35mm of design, interior
Hole depth 186mm.
(2) design same process program and carry out simulation analysis, result such as Figure 13, revolving die backward extrusion and conventional backward extrusion phase
Ratio, axial load is greatly reduced；It is the structure of boss according to punch end face, calculates revolving die backward extrusion maximum load 400000N, school
The punch unitstress calculated is 416MPa, and the actual peak torque born of punch is 2700000N mm (such as Figure 14), punch material
Material is chosen H13 steel and be ensure that the stability of punch design.
(3) by blank heating to 420 ± 10 DEG C, concave die cavity and punch work strip coating graphitic lubricant, mould preheats
Temperature is 300 DEG C, is placed in concave die cavity by blank, and die inner surface is designed with the interior cone angle of 0.1 °, by revolving die backward extrusion
Shape, obtain designed forging.Compared with conventional backward extrusion, the obvious crystal grain thinning of this technique.
A kind of slender member revolving die backward extrusion that the present invention proposes carefully brilliant manufacturing process and mould, one is design rotary punch
Backward extrusion technology and mould, compared with conventional backward extrusion technology, be greatly reduced load and the unitstress of punch carrying, and two is to set
The protruding list structure of meter punch end face, refines blank crystal grain；Three be design slip insert in punch zone line axially-movable,
Strengthen the stability of punch, be conducive to improving punch draw ratio, it is adaptable to copper alloy, aluminium alloy, magnesium alloy, steel alloy etc. are multiple
The slender member figuration manufacture of material, shortened process, improves slender member manufacturing property.
Claims (10)
1. a slender member revolving die backward extrusion carefully brilliant shaping dies, it is characterised in that described mould includes: upper die structure and under
Mode structure, wherein upper die structure includes upper shell, is provided with insert in upper shell, is provided with projection on the inwall of upper shell,
Being provided with respective slot on the outer wall of insert, upper shell inner wall lower is provided with shoulder hole, the upper surface of insert be provided with
The bucking ladder that shoulder hole is corresponding；The upper surface of upper shell is provided with two relative gear rings, and gear ring is fixed on by axostylus axostyle
In top cylinder body wall, the centre of two gear rings is provided with the punch case being meshed with gear ring, and key is passed through with convex in the top of punch
Die sleeve interference fit so that the rotation of punch case can drive the rotation of punch；
Lower die structure includes lower shell, and the top of lower shell has bottom plate, and the bottom of lower shell has lower bolster, lower shell
Bottom be provided with lower bolster, lower bolster is provided with die, between groove and the inwall of lower shell, is provided with shrink ring,
Push rod is positioned at the bottom of lower shell after passing lower bolster and lower bolster；
Being provided with support bar on bottom plate, the head of support bar is provided with limit for height block, and the bottom of insert is provided with and limit for height
The blind hole that block is corresponding.
2. slender member revolving die backward extrusion as claimed in claim 1 carefully brilliant shaping dies, it is characterised in that insert outer surface is opened
There are 4 uniform through-hole grooves, and symmetry is split into left insert and right insert, left insert and right insert and punch matched in clearance, and
The boss matched in clearance uniform with upper shell inner surface 4, prevents left insert and the rotation of right insert, ensure simultaneously left insert and
The axially-movable of right insert.
3. slender member revolving die backward extrusion as claimed in claim 1 carefully brilliant shaping dies, it is characterised in that die inner surface has
There is interior cone angle.
4. slender member revolving die backward extrusion as claimed in claim 1 carefully brilliant shaping dies, it is characterised in that 4 on die
Individual uniform limit for height block, limit for height block can rotate along its support bar axis, has promotion left insert, the merit of right insert axially-movable
Can, have the function of dnockout concurrently simultaneously.
5. slender member revolving die backward extrusion as claimed in claim 1 carefully brilliant shaping dies, it is characterised in that actively mould can be
Upper mold, i.e. upper mold are suppressed downwards along axis, and lower mold axial location is static；Actively mould can also be lower mold, i.e. lower mold along axis to
Upper compacting, upper mold axial location is static.
6. use a manufacturing process for the carefully brilliant shaping dies of the slender member revolving die backward extrusion described in claim 1, its feature
Being, left motor drives general power P of transmissionLeft(KW) ,/right motor drives general power P of transmissionRight(KW) with rotating speed n (rad/
Min) ratioWherein η is power transfer efficiency；[τ] is that the maximum twist that punch material bears is cut
Shearing stress (Pa)；D is convex mould diameter (m).
7. slender member revolving die backward extrusion as claimed in claim 6 carefully brilliant manufacturing process, it is characterised in that first blank is put
In concave die cavity, then in the active mould axially opposed motion of effect lower punch, make blank generation plastic deformation；When punch work
Make region completely into blank inside after, while the axially opposed motion of punch, along extruding center axle rotary motion, work as a left side
After right insert contacts with limit for height block, left and right insert is slided in punch the most relatively, makes blank occur continuous rotary squeezing the most brilliant
Deformation.
8. slender member revolving die backward extrusion as claimed in claim 6 carefully brilliant manufacturing process, it is characterised in that punch is along extruding
The implementation method of mandrel rotary motion, is to be driven by left and/or right motor to drive left and/or right gear ring to rotate respectively, left
And/or right gear circle drives punch case to rotate by gear engagement, punch case drives punch to rotate by equally distributed key block
Motion, uses interference fit between key block and punch case and punch.
9. slender member revolving die backward extrusion as claimed in claim 6 carefully brilliant manufacturing process, it is characterised in that when blank work shape
Maximum distortion stress σ under statecr＞ α σsTime, punch L1The allowable maximum draw ratio of section isConvex
Mould L2The allowable maximum draw ratio of section isAs the maximum distortion stress σ under blank dutycr
≤ασsTime, punch L1The allowable maximum draw ratio of section isPunch L2The allowable maximum draw ratio of section is
Wherein E is the elastic modelling quantity (Pa) of punch material, σsFor the limiting yield stress (Pa) under punch duty, d is punch
Diameter (m), α is bending-buckling coefficient；σcrFor the maximum distortion stress (Pa) under blank duty, K1And K2For safety system
Number, punch L1The safety coefficient K of section1≤ 0.8, punch L2The safety coefficient K of section2≤ 0.6, and K1More than K2。
10. slender member revolving die backward extrusion as claimed in claim 6 carefully brilliant manufacturing process, it is characterised in that punch end face has
3～4 uniform protruding list structures, the peak torque that punch bearsWherein [τ] is punch
The maximum twist shear stress (Pa) that material bears, δ is safety coefficient；D is convex mould diameter (m)；In rotary punch backward extrusion
Cheng Zhong, the protruding list structure of punch end face embeds inside blank, and makes blank surface region violent plastic deformation occur, carefully
Change crystal grain.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107433300A (en) * | 2017-08-01 | 2017-12-05 | 中国兵器工业第五九研究所 | A kind of open die cavity mold for extruding and forming |
| CN112453087A (en) * | 2020-09-30 | 2021-03-09 | 中北大学 | Movable rotary driving device and multi-motion-form pressing-twisting combined loading extrusion equipment |
| CN112453086A (en) * | 2020-09-30 | 2021-03-09 | 中北大学 | Multi-motion-form pressing and twisting combined loading extrusion equipment |
| CN112718901A (en) * | 2020-11-17 | 2021-04-30 | 哈工大（威海）创新创业园有限责任公司 | Preparation process and extrusion die for magnesium alloy pipe under multiple strain paths |
| CN113182474A (en) * | 2021-04-09 | 2021-07-30 | 中北大学 | Forming method of cylinder workpiece with transverse inner ribs |
| CN113369325A (en) * | 2021-06-11 | 2021-09-10 | 中国兵器工业第五九研究所 | Extrusion forming process |
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| CN107433300B (en) * | 2017-08-01 | 2019-04-02 | 中国兵器工业第五九研究所 | A kind of style of opening chamber mold for extruding and forming |
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| CN112453086A (en) * | 2020-09-30 | 2021-03-09 | 中北大学 | Multi-motion-form pressing and twisting combined loading extrusion equipment |
| CN112453086B (en) * | 2020-09-30 | 2022-09-23 | 中北大学 | Multi-motion-form pressing and twisting combined loading extrusion equipment |
| CN112453087B (en) * | 2020-09-30 | 2022-10-18 | 中北大学 | Movable rotary driving device and multi-motion-form pressing-twisting combined loading extrusion equipment |
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| CN113182474A (en) * | 2021-04-09 | 2021-07-30 | 中北大学 | Forming method of cylinder workpiece with transverse inner ribs |
| CN113182474B (en) * | 2021-04-09 | 2022-04-15 | 中北大学 | Forming method of barrel workpiece with transverse inner ribs |
| CN113369325A (en) * | 2021-06-11 | 2021-09-10 | 中国兵器工业第五九研究所 | Extrusion forming process |
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