CN106238486B - A kind of slender member revolving die backward extrusion fine grain shaping dies and manufacturing process - Google Patents
A kind of slender member revolving die backward extrusion fine grain shaping dies and manufacturing process Download PDFInfo
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- CN106238486B CN106238486B CN201610681623.9A CN201610681623A CN106238486B CN 106238486 B CN106238486 B CN 106238486B CN 201610681623 A CN201610681623 A CN 201610681623A CN 106238486 B CN106238486 B CN 106238486B
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- 238000001125 extrusion Methods 0.000 title claims abstract description 54
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 238000007493 shaping process Methods 0.000 title claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000013078 crystal Substances 0.000 claims abstract description 12
- 230000003068 static effect Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 2
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 238000012546 transfer Methods 0.000 claims description 2
- 239000007787 solid Substances 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 16
- 238000005242 forging Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 8
- 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
- 238000004364 calculation 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
- 229910001369 Brass 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
- 239000010951 brass Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000002708 enhancing effect Effects 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
- 238000012545 processing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
- Extrusion Of Metal (AREA)
Abstract
The invention discloses a kind of slender member revolving die backward extrusion fine grain manufacturing process and molds, including upper die structure and lower die structure, process is that blank is placed in concave die cavity first, then the axially opposed movement of lower punch is acted in active mould, blank is made to be plastically deformed；After punch-pin works region completely into blank inside, while punch-pin axially opposed movement, along extruding center axis rotary motion, after left and right insert and limit for height block contact, the opposite sliding simultaneously in punch-pin of left and right insert, makes blank that continuous rotation occur and squeezes fine crystal deformation.Shaping load can be greatly reduced in the present invention, enhance the stability of punch-pin, improve punch-pin draw ratio, be suitable for the slender member figuration manufacture of the multiple materials such as copper alloy, aluminium alloy, magnesium alloy, steel alloy, shorten technological process, improve slender member manufacturing property.
Description
Technical field
The present invention relates to a kind of slender member revolving die backward extrusion fine grain manufacturing process and molds.
Background technology
With the fast development of high-end equipment manufacture, product structure enlargement, integration, high-performance, low cost have become
For general character development trend, elongated blind hole component manufacture is related to the multiple materials such as copper alloy, aluminium alloy, magnesium alloy, steel alloy with material,
Its draw ratio is increasingly longer, has exceeded the ability scope 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 brass backward extrusion part, mild steel backward extrusion part
Draw ratio≤3, if the draw ratio of backward extrusion part is excessive, be more than punch-pin flexural stress, then extrusion process convex mould be easy
" drift " deviates extruding center axis, and punch-pin bending is more seriously caused to fracture.It is at present to adopt for big L/D ratio component more
With the technique of punching, pulling, but the manufacturing process flow of the technique is long, and heating times are more, and the ability of blank crystal grain refinement is limited.
Invention content
The object of the present invention is to provide a kind of slender member revolving die backward extrusion fine grain shaping dies and manufacturing process.
To achieve the goals above, using following technical scheme.
A kind of slender member revolving die backward extrusion fine grain shaping dies, which is characterized in that the mold includes：Upper die structure and
Lower die structure, wherein upper die structure include upper shell, and insert is provided in upper shell, are provided on the inner wall of upper shell convex
It rises, respective slot is provided on the outer wall of insert, upper shell inner wall lower is provided with stepped hole, and the upper surface of insert is provided with
Bucking ladder corresponding with stepped hole；There are two opposite gear ring, gear ring is fixed by shaft for the upper surface setting of upper shell
In upper shell wall, the centre of two gear rings is provided with the punch case being meshed with gear ring, the top of punch-pin by key with
Punch case is interference fitted so that the rotation of punch case can drive the rotation of punch-pin；
Lower die structure includes lower shell, and there is bottom plate, the lower part of lower shell to have lower template on the top of lower shell, under
The bottom of cylinder is provided with lower bolster, and cavity plate is provided on lower bolster, and pre- answer is provided between groove and the inner wall of lower shell
Power circle, mandril are located at the bottom of lower shell after lower bolster and lower template；
Be provided with supporting rod on bottom plate, the head of supporting rod is provided with limit for height block, the bottom of insert be provided with
The corresponding blind hole of limit for height block.
Insert outer surface is provided with 4 uniformly distributed through-hole grooves, and is symmetrically split into left insert and right insert, left insert and right edge
Block and punch-pin clearance fit, and with 4 uniformly distributed boss clearance fits of upper shell inner surface, prevent turning for left insert and right insert
It is dynamic, while ensureing the axial movement of left insert and right insert.
Cavity plate inner surface has interior cone angle.
4 uniformly distributed limit for height blocks on cavity plate, limit for height block can support rod axis rotation along it, have and push left edge
The function that block, right insert are axially moved, while having both the function of dnockout.
Active mould can be upper mold, i.e. upper mold is suppressed downwards along axis, and lower die axial position is static；Active mould may be
Lower die, i.e. lower die are suppressed upwards along axis, and upper mold axial position is static.
A kind of manufacturing process using above-mentioned slender member revolving die backward extrusion fine grain shaping dies, which is characterized in that left
The general power P that motor driving is transmittedIt is left(KW) ,/right motor drives the general power P of transmissionIt is right(KW) and the ratio of rotating speed n (rad/min)
ValueWherein η is power transfer efficiency；[τ]The maximum twist shear stress born for punch-pin material
(Pa)；D is convex mould diameter (m).
Blank is placed in concave die cavity first, then the axially opposed movement of lower punch is acted in active mould, makes blank
It is plastically deformed；After punch-pin works region completely into blank inside, while punch-pin axially opposed movement, along squeezing
Center axis rotation movement is pressed, after left and right insert and the contact of limit for height block, insert opposite sliding simultaneously in punch-pin in left and right makes blank
Continuous rotation occurs and squeezes fine crystal deformation.
Punch-pin is to drive a left side respectively by the driving of left and/or right motor along the implementation method of extruding center axis rotary motion
And/or the rotation of right gear circle, left and/or right gear ring is engaged by gear drives punch case to rotate, and punch case is by uniformly dividing
The key block of cloth drives punch-pin rotary motion, using interference fit between key block and punch case and punch-pin.
As the maximum distortion stress σ under blank working conditioncr> α σsWhen, punch-pin L1The maximum draw ratio allowable of section isPunch-pin L2The maximum draw ratio allowable of section isWhen blank work
Make the maximum distortion stress σ under statecr≤ασsWhen, punch-pin L1The maximum draw ratio allowable of section isPunch-pin
L2The maximum draw ratio allowable of section is
Wherein E is the elasticity modulus (Pa) of punch-pin material, σsFor the limiting yield stress (Pa) under punch-pin working condition, d
For convex mould diameter (m), α is bending-buckling coefficient；σcrFor the maximum distortion stress (Pa) under blank working condition, K1And K2For peace
Overall coefficient, punch-pin L1The safety coefficient K of section1≤ 0.8, punch-pin L2The safety coefficient K of section2≤ 0.6, and K1More than K2。
Punch-pin end face has 3~4 uniformly distributed raised strip structures, the peak torque that punch-pin is bornQi Zhong [τ]For the maximum twist shear stress (Pa) that punch-pin material is born, δ is safety coefficient；
D is convex mould diameter (m)；During rotary punch backward extrusion, inside the raised strip structure insertion blank of punch-pin end face, and make
Violent plastic deformation, crystal grain thinning occur for blank surface region.
The present invention is greatly reduced by designing rotary punch backward extrusion technology and mold compared with conventional backward extrusion technology
The load and unitstress of punch-pin carrying；By designing the raised strip structure of punch-pin end face, blank crystal grain is refined；Pass through design
It slides insert to be axially moved in punch-pin intermediate region, enhances the stability of punch-pin, be conducive to improve punch-pin draw ratio, be suitable for copper
The slender member figuration manufacture of the multiple materials such as alloy, aluminium alloy, magnesium alloy, steel alloy shortens technological process, improves elongated structure
Part manufacturing property.
Figure of description
Fig. 1 is revolving die backward extrusion fine grain shaping dies schematic diagram in the present invention；
Fig. 2 is punch structure schematic diagram；
Fig. 3 is punch-pin rotary drive schematic diagram；
Fig. 4 is whole insert structure schematic diagram；
Fig. 4 A are the sectional view of the A-A in Fig. 4；
Fig. 4 B are the sectional view of the B-B along Fig. 4；
Fig. 5 is upper shell structural schematic diagram；
Fig. 5 A are the sectional view of the A-A in Fig. 5；
Fig. 5 B are the sectional view of the B-B along Fig. 5；
Fig. 6 is limit for height block structure schematic diagram；
Fig. 7 is that punch-pin end face is boss structure schematic diagram；
Fig. 8 is that punch-pin end face is 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 torque 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 torque and time chart；
Figure 13 is copper alloy forging axial load and time chart；
Figure 14 is copper alloy forging revolving die backward extrusion torque and time chart；
In figure, 1-left motor；2-cope plates；3-upper mounted plates；4-left gear circles；5-left axle bars；6-punch cases；
7-upper shells；8-left inserts；9-punch-pin；10-bottom plates；11-lower shells；12-shrink rings；13-cavity plates；
14-mandrils；15-lower bolsters；16-lower templates；17-upper padding plates；18-left ball bearings；19-thrust bearings；20-key blocks；
21-right motors；22-right gear circles；23-right axle bars；24-right ball bearings；25-right inserts；26-washers；27-limits for height
Block；28-supporting rods；29-blanks.
Specific implementation mode
Below in conjunction with example, the invention will be further described.
First according to the geometry of product and material, revolving die backward extrusion total deformation is designed, corresponding forging drawing is formulated,
The parameters such as axial load, axial stress, horizontal load, horizontal stress, torque during calculating revolving die backward extrusion, on this basis
Manufacture and design revolving die indirect-extrusion mould, and appraises and decides punch-pin material and performance, motor type, lubricating system, dress feeding and discharging side
Then revolving die indirect-extrusion mould is mounted in hydraulic press, then blank is placed in concave die cavity by formula etc., under the effect of active mould
The axially opposed movement of punch-pin, makes blank be plastically deformed；After punch-pin works region completely into blank inside, punch-pin
While axially opposed movement, along extruding center axis rotary motion, after left and right insert and the contact of limit for height block, left and right insert exists
Opposite sliding simultaneously in punch-pin, makes blank that continuous rotation occur and squeezes fine crystal deformation.
Embodiment 1
(1) product material is steel alloy, and product endoporus draw ratio is 5.1, forging diameter of bore Φ 35mm of the design, interior
Hole depth 168mm.
(2) on the basis of product forging drawing, devise that conventional backward extrusion (i.e. punch-pin only axially movable), revolving die is counter squeezes
Two kinds of techniques are pressed, devise that punch-pin end face is boss structure (such as Fig. 7), punch-pin end face is two kinds of structures of groove structure (such as Fig. 8),
Compacting movement is upper mold active, lower die active two ways, and result such as Fig. 9, Ke Yifa of simulation analysis are carried out to said program
Compared with conventional backward extrusion, axial load is greatly reduced for existing revolving die backward extrusion, while the structure that punch-pin end face is boss compares groove
Structure is more laborsaving, and upper mold actively influences less axial load with the mode of lower die active.It is boss according to punch-pin end face
Structure, calculates revolving die backward extrusion maximum load 500000N, and the punch-pin unitstress that school is calculated is 520MPa.
(3) manufacturing and designing revolving die indirect-extrusion mould, design punch-pin end face is boss structure, punch-pin material selection H13 steel,
Yield stress σ under quenching+tempering processing statesFor 1460MPa, elastic modulus E 210GPa, bending-buckling coefficient chooses α
=0.57, the maximum twist shear stress that punch-pin material is born and the ratio of punch-pin material limits yield stress choose 0.6, then count
Calculation obtains punch-pin L1The maximum draw ratio allowable of section is 6.1, punch-pin L2The maximum draw ratio allowable of section is 4.5, punch-pin design of material
The peak torque born is 7001794Nmm, and the practical peak torque born of revolving die Back Extrusion Punches is about 2800000N
Mm (such as Figure 10), can ensure the stability of punch design.The left insert and right insert and punch-pin clearance fit of design, and with it is upper
The uniformly distributed boss clearance fit of cylinder inner surface 4, prevents the rotation of left insert and right insert, while ensureing left insert and right edge
The axial movement of block.It can be upper mold to design active mould, can also be lower die, and mold is mounted in hydraulic test.
(4) for blank heating to 1000 ± 10 DEG C, concave die cavity and punch-pin work band coating graphitic lubricant, mold preheating are warm
Degree is 300 DEG C, blank is placed in concave die cavity, cavity plate inner surface is designed with 0.1 ° of interior cone angle, and punch-pin land length is
5mm acts on lower punch 15mm axially movable in upper mold active mould, so that blank is plastically deformed, then left/right motor drives
The rotation of left/right gear ring is driven respectively, and left/right gear ring is engaged by gear drives punch case to rotate, and punch case passes through uniform
The key block of distribution drives punch-pin rotary motion, using interference fit between key block and punch case and punch-pin so that punch-pin is in an axial direction
While relative motion, along extruding center axis rotary motion, after left and right insert and the contact of limit for height block, left and right insert is in punch-pin
Opposite sliding simultaneously makes blank that continuous rotation occur and squeezes fine crystal deformation, obtains designed forging.With conventional backward extrusion phase
Than the technique significantly improves forging comprehensive performance.
Embodiment 2
(1) product material is 7A04, and product endoporus draw ratio is 8.3, designs diameter of bore Φ 35mm of forging, interior hole depth
280mm。
(2) it designs same process program and carries out simulation analysis, as a result such as Figure 11, revolving die backward extrusion and conventional backward extrusion phase
Than axial load is greatly reduced；According to the structure that punch-pin end face is boss, revolving die backward extrusion maximum load 200000N, school are calculated
The punch-pin unitstress of calculation is 208MPa, and the practical peak torque born of punch-pin is 1200000Nmm (such as Figure 12), punch-pin material
Material, which chooses H13 steel, can ensure the stability of punch design.
(3) by blank heating to 410 ± 5 DEG C, concave die cavity and punch-pin work band coating graphitic lubricant, mold preheating are warm
Degree be 300 DEG C, blank is placed in concave die cavity, cavity plate inner surface is designed with 0.1 ° of interior cone angle, by revolving die backward extrusion at
Shape, obtained 7A04 forging crystal grain is tiny, distribution uniform.
Embodiment 3
(1) product material is ormolu, and product endoporus draw ratio is 5.6, forging diameter of bore Φ 35mm of design, interior
Hole depth 186mm.
(2) it designs same process program and carries out simulation analysis, as a result such as Figure 13, revolving die backward extrusion and conventional backward extrusion phase
Than axial load is greatly reduced；According to the structure that punch-pin end face is boss, revolving die backward extrusion maximum load 400000N, school are calculated
The punch-pin unitstress of calculation is 416MPa, and the practical peak torque born of punch-pin is 2700000Nmm (such as Figure 14), punch-pin material
Material, which chooses H13 steel, can ensure the stability of punch design.
(3) by blank heating to 420 ± 10 DEG C, concave die cavity and punch-pin work band coating graphitic lubricant, mold preheat
Temperature is 300 DEG C, blank is placed in concave die cavity, cavity plate inner surface is designed with 0.1 ° of interior cone angle, passes through revolving die backward extrusion
Forming obtains designed forging.Compared with conventional backward extrusion, the apparent crystal grain thinning of the technique.
A kind of slender member revolving die backward extrusion fine grain manufacturing process and mold proposed by the present invention, first, design rotary punch
Compared with conventional backward extrusion technology the load and unitstress of punch-pin carrying is greatly reduced, second is that setting in backward extrusion technology and mold
The raised strip structure of punch-pin end face is counted, blank crystal grain is refined；Third, design sliding insert is axially moved in punch-pin intermediate region,
The stability for enhancing punch-pin is conducive to improve punch-pin draw ratio, it is a variety of to be suitable for copper alloy, aluminium alloy, magnesium alloy, steel alloy etc.
The slender member figuration manufacture of material shortens technological process, improves slender member manufacturing property.
Claims (9)
1. a kind of slender member revolving die backward extrusion fine grain shaping dies, which is characterized in that the mold includes：Upper die structure is under
Mode structure, wherein upper die structure include upper shell, and insert is provided in upper shell, and protrusion is provided on the inner wall of upper shell,
Corresponding through-hole groove is provided on the outer wall of insert, upper shell inner wall lower is provided with stepped hole, the upper surface setting of insert
There is bucking ladder corresponding with stepped hole；There are two opposite gear ring, gear ring is solid by shaft for the upper surface setting of upper shell
It is scheduled in upper shell wall, the centre of two gear rings is provided with the punch case being meshed with gear ring, and the top of punch-pin passes through key
Block is interference fitted with punch case so that the rotation of punch case can drive the rotation of punch-pin；
Lower die structure includes lower shell, and there is bottom plate, the lower part of lower shell to have lower template, lower shell on the top of lower shell
Bottom be provided with lower bolster, be provided with cavity plate on lower bolster, shrink ring be provided between cavity plate and the inner wall of lower shell,
Mandril is located at the bottom of lower shell after lower bolster and lower template；
Supporting rod is provided on bottom plate, the head of supporting rod is provided with limit for height block, and the bottom of insert is provided with and limit for height
The corresponding blind hole of block.
2. slender member revolving die backward extrusion fine grain shaping dies as described in claim 1, which is characterized in that open insert outer surface
There are 4 uniformly distributed through-hole grooves, and is symmetrically split into left insert and right insert, left insert and right insert and punch-pin clearance fit, and
With 4 uniformly distributed raised clearance fits of upper shell inner surface, prevent the rotation of left insert and right insert, at the same ensure left insert and
The axial movement of right insert.
3. slender member revolving die backward extrusion fine grain shaping dies as described in claim 1, which is characterized in that cavity plate inner surface has
There is interior cone angle.
4. slender member revolving die backward extrusion fine grain shaping dies as described in claim 1, which is characterized in that on bottom plate
4 uniformly distributed limit for height blocks, limit for height block can support rod axis rotation along it, have and left insert, right insert is pushed to be axially moved
Function, while having both the function of dnockout.
5. slender member revolving die backward extrusion fine grain shaping dies as described in claim 1, which is characterized in that active mould can be
Upper mold, i.e. upper mold are suppressed downwards along axis, and lower die axial position is static；Active mould may be lower die, i.e., lower die along axis to
Upper compacting, upper mold axial position are static.
6. a kind of manufacturing process using slender member revolving die backward extrusion fine grain shaping dies described in claim 1, feature
It is, the general power P that left motor driving is transmittedIt is left, the general power P of right motor driving transmissionIt is rightWith the ratio of rotating speed nWherein η is power transfer efficiency；δ is safety coefficient；[τ]The maximum torsion born for punch-pin material
Turn shear stress, unit Pa；D is convex mould diameter, unit m, PIt is left, unit KW；PIt is right, unit KW；N, unit rad/
Min, left motor, right motor gear position engaged respectively with the gear position of left gear circle, right gear circle；
Insert outer surface is provided with 4 uniformly distributed through-hole grooves, and is symmetrically split into left insert and right insert, left insert and right insert with
Punch-pin clearance fit, and with 4 uniformly distributed raised clearance fits of upper shell inner surface, prevent the rotation of left insert and right insert,
Blank, is placed in concave die cavity by the axial movement for ensureing left insert and right insert simultaneously first, then under the effect of active mould
The axially opposed movement of punch-pin, makes blank be plastically deformed；After punch-pin works region completely into blank inside, punch-pin
While axially opposed movement, along extruding center axis rotary motion, after left and right insert and the contact of limit for height block, left and right insert exists
Opposite sliding simultaneously in punch-pin, makes blank that continuous rotation occur and squeezes fine crystal deformation.
7. using the manufacturing process of slender member revolving die backward extrusion fine grain shaping dies as claimed in claim 6, feature exists
It is that left and/or right is driven by the driving of left and/or right motor respectively in punch-pin along the implementation method of extruding center axis rotary motion
Gear ring rotates, and left and/or right gear ring is engaged by gear drives punch case to rotate, and punch case passes through equally distributed key block
Punch-pin rotary motion is driven, using interference fit between key block and punch case and punch-pin.
8. using the manufacturing process of slender member revolving die backward extrusion fine grain shaping dies as claimed in claim 6, feature exists
In as the maximum distortion stress σ under blank working conditioncr> α σsWhen, punch-pin L1The maximum draw ratio allowable of section isPunch-pin L2The maximum draw ratio allowable of section isWhen blank work
Make the maximum distortion stress σ under statecr≤ασsWhen, punch-pin L1The maximum draw ratio allowable of section isPunch-pin
L2The maximum draw ratio allowable of section is
Wherein E is the elasticity modulus of punch-pin material, unit Pa, σsFor the limiting yield stress under punch-pin working condition, unit is
Pa, d are convex mould diameter, and unit m, α are bending-buckling coefficient；σcrFor the maximum distortion stress under blank working condition, unit
For Pa, k1And k2For safety coefficient, punch-pin L1The safety coefficient k of section1≤ 0.8, punch-pin L2The safety coefficient k of section2≤ 0.6, and
k1More than k2, L1Section refers to distance of the insert lower face apart from convex die rod subordinate end face, L2Section refers to insert upper surface apart from punch-pin boss
The distance of lower face.
9. using the manufacturing process of slender member revolving die backward extrusion fine grain shaping dies as claimed in claim 6, feature exists
There is 3~4 uniformly distributed raised strip structures, the peak torque that punch-pin is born in punch-pin end faceUnit is
Nm, Qi Zhong [τ]For the maximum twist shear stress that punch-pin material is born, unit Pa, δ are safety coefficient；D is that punch-pin is straight
Diameter, unit m；During rotary punch backward extrusion, inside the raised strip structure insertion blank of punch-pin end face, and make blank
Violent plastic deformation, crystal grain thinning occur for surface region.
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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 |
| 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 |
| CN112453086B (en) * | 2020-09-30 | 2022-09-23 | 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 |
| CN113182474B (en) * | 2021-04-09 | 2022-04-15 | 中北大学 | Forming method of barrel workpiece with transverse inner ribs |
| CN113369325B (en) * | 2021-06-11 | 2022-08-09 | 中国兵器工业第五九研究所 | Extrusion forming process |
| CN115464114B (en) * | 2022-08-19 | 2024-08-20 | 昆明理工大学 | Thixotropic rotary extrusion method and device for shaft sleeve part |
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| GB258083A (en) * | 1925-09-10 | 1926-09-16 | Serck Radiators Ltd | Improvements relating to the extrusion of metals to form tubes |
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| CN104624694B (en) * | 2014-12-02 | 2016-09-07 | 中北大学 | A kind of interior horizontal bar pressing method of cylindrical member |
| CN105268756B (en) * | 2015-09-22 | 2017-05-03 | 北京机电研究所 | Die for pre-forming inner holes of deep-hole shaft parts, method for forming inner holes and forming process of deep-hole shaft parts |
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- 2016-08-17 CN CN201610681623.9A patent/CN106238486B/en active Active
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