CN107716668A - A kind of sheet material ring ripple drawing severe deformation mould and processing method repeatedly - Google Patents
A kind of sheet material ring ripple drawing severe deformation mould and processing method repeatedly Download PDFInfo
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- CN107716668A CN107716668A CN201710875169.5A CN201710875169A CN107716668A CN 107716668 A CN107716668 A CN 107716668A CN 201710875169 A CN201710875169 A CN 201710875169A CN 107716668 A CN107716668 A CN 107716668A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D13/00—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form
- B21D13/02—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form by pressing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
- B21D43/003—Positioning devices
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
Abstract
A kind of sheet material ring ripple drawing severe deformation mould and technique repeatedly, the mould includes two collar ripple moulds, that is ring ripple mould A, ring ripple mould B, two collar ripple moulds are axisymmetric cylindrical structural, and thereon, by the convex-concave of some number of turns, continuously alternately the ring ripple that can coincide is formed for lower surface, and the ring ripple radian and length of axis center are larger, wave height is smaller, outside from axis center, ring ripple radian and length from coil to coil reduce, the increase of wave height from coil to coil.Mould is dynamic model on the ring ripple, and lower mould is cover half, and mould upper end is provided with the detent mechanism of two groups of radial symmetric arrangements under ring ripple；Ring waveform of the upper and lower mould of ring ripple by matched moulds by sheet material drawing to setting；The technique is by the mould, and drawing deformation refinement sheet material crystal grain, makes crystallite dimension reach micron or submicron order repeatedly.The present invention is not limited by board dimension, can be processed large-sized sheet material, can greatly be improved the combination property of the physics, chemistry, mechanics of sheet material etc..
Description
Technical field
The present invention relates to a kind of metal material processing method and processing mold.
Background technology
Severe deformation is carried out to sheet material to be current refinement sheet material crystal grain, optimizes the prevailing technology of plate property, its typical process
There are Processed by Accumulative Roll-bonding, high pressure torsion, limitation die pressing, repeatedly wrinkle-straightening method etc..These method overwhelming majority are all by material
The limitation of size, it is difficult to large-sized product is prepared, or stronger anisotropy be present in prepared material.
University On The Mountain Of Swallows professor Luo Junting is for problem present in above-mentioned Board Forming process, it is proposed that a kind of sheet material ring ripple
Drawing severe deformation mould and technique repeatedly, and declared patent of invention (patent No. application number：2016110779707), the technique
By single collar ripple mould, Iteratively forming refinement sheet material crystal grain, crystallite dimension is set to reach micron or submicron order, while not by plate
The limitation of material size.But in place of the technique Shortcomings：Drawing repeatedly is carried out to sheet material using only single mold, sheet material is deforming
During Light deformation region all the time be present, when especially drawing number is excessive repeatedly, strain corresponding in each ring mould crest, trough
Largely accumulated at deformation, ring ripple junction can not accumulate enough strains all the time, so that sheet deformation is uneven, and draw repeatedly
It is more to prolong number, strain is uneven more notable.
The content of the invention
It is an object of the present invention to provide one kind cause the uniform sheet material ring ripple of sheet deformation repeatedly drawing severe deformation mould and add
Work method.The present invention mainly passes through two collar ripple moulds, carries out drawing repeatedly to sheet material successively, refines sheet material crystal grain, makes crystalline substance
Particle size reaches micron or submicron order.
The technical solution adopted in the present invention is：
First, mould
The mould of the present invention is two collar ripple moulds, is mainly included：Ring ripple mould A, ring ripple mould B.The ring ripple mould
A, ring ripple mould B forms by mould under ring ripple mold and ring ripple, i.e., mould A under ring ripple mold A, ring ripple, mould on ring ripple
Has mould B under B and ring ripple.Mould B is axial symmetry under mould A, ring ripple mold B and ring ripple under ring ripple mold A, ring ripple
Cylindrical structural, by the convex-concave of some number of turns, continuously alternately the ring ripple that can coincide is formed, and axle on its relative upper and lower surface
The ring ripple radian and length at center are larger, and wave height is smaller, outside from axis center, and ring ripple radian and length from coil to coil reduce, wave height by
Circle increase；The geometric center of cardiac wave overlaps with cardiac wave in ring ripple mould A in the ring ripple mould B, is all axis center.Except middle cardiac wave
Outside, ring ripple mould B crests, corresponding with trough junction with ring ripple mould A crest respectively at trough；Described ring ripple mould A, B
Comprising ring ripple on mould A, mould B is connected with the moved cross beam of hydraulic press respectively on ring ripple, described ring ripple mould A, B are included
Ring ripple under under mould A, ring ripple mould B be fixed on respectively by the sill of hydraulic press on work top, mould is dynamic model on ring ripple, ring
Mould is cover half under ripple.
Open slot, the relative ring for forming all wall openings of open slot of upper and lower mould are set in end edge outside ring ripple mould A, B ring ripple
Connected in star, sets 4 uniform detent mechanisms on the position of the annular groove, and the detent mechanism mainly includes：Connector, spiral shell
Mother, positioning screw, spring and position block.Wherein, with the connector that mould perisporium is connected under ring ripple, it puts down with mould perisporium under ring ripple
Capable part is provided with through hole, sets nut outside the positioning screw being placed on the through hole, and the inner and position block towards center
Inner bolt hole threaded connection, be cased with being placed in the spring between position block and connector outside positioning screw.Retaining spring is in
Pre strained state, after placing sheet material, position block is opened by sheet material top, and adjusting positioning screw by nut makes under sheet material and ring ripple in mould
Heart accurate alignment positions, and in drawing process, as the big footpath of sheet material reduces, position block heads on sheet material and further positioned, it is ensured that
The accurate drawing repeatedly of sheet material.Separately in ring ripple mould close to the position on periphery, position preferably corresponding with annular groove, provided with
Ring ripple mold axis is parallel and using the axis as symmetrical two groups of through holes, and it is each in one group, every group that it, which is located at the through hole of upper and lower mould,
If set guide pin bushing between mould on a guide pillar, guide pillar and ring ripple.
Ring ripple radian, length, height and the number of turns depend on the forming property of sheet material and the radius and thickness of sheet material.Close
The radian of reason design ring ripple, length, height, are designed specifically to：The ring ripple radian and length of ring ripple mould axis center are larger, wave height
Smaller, outside from axis center, ring ripple radian and length from coil to coil reduce, the increase of wave height from coil to coil.Design considerations is：Each drawing deformation
After especially deforming for the first time, the maximum strain amount that sheet material is accumulated is no more than strain of the sheet material in simple tension plastic instability
Value, and every time after deformation, each crest is maximum and close with accumulation strain at trough.The number of turns of ring ripple is complete with the ring ripple of ring ripple mould
All standing annular sheet metal or be slightly less than ring ripple sheet material, it is appropriate that to leave flange be foundation.Ring ripple mould A and ring ripple mould B pair
It should be related to：It is corresponding with ring ripple mould A crest and trough junction respectively at ring ripple mould B crests, trough, to ensure repeatedly
The uniformity of sheet material after drawing, refer to the attached drawing are calculated parameters such as L, R, H, l, r, h.When first time drawing deforms, each ripple
Peak is maximum and equal with accumulation strain at trough, and maximum strain value is controlled in the range of 0.2~0.25, each die parameters of L, R, H
It is designed as：L1=16.5, L2=27.5, L3=37.5, L4=47.5, L5=57.5, L6=65.5, R1=15.5, R2=5.3, R3
=3.8, R4=4, R5=3.1, R6=3.2, R7=2, H1=0.4, H2=2, H3=0.3, H4=2.1, H5=0.15, H6=
2.46.Second drawing die parameter l, r, h calculate according to equation below： r1=R1-4,r2=R2-0.5,r3=R3+0.5,r4=R4-
0.5,r5=R5+0.5,r6=R6-0.5,r7=R7, h1=H1+0.4,h2=H2-0.1,h3=H3+0.1,h4=H4-0.1,h5=
H5+0.1,h6=H6-0.1.(unit：mm)
2nd, processing method
The processing method of the present invention is specific as follows：
(1) circular sheet material is placed on mould A centers under ring ripple, adjusts positioning screw, calibrate circular sheet material and ring ripple
Lower mould A centers accurate alignment.
(2) hydraulic press is started, mould A starts descending according to predetermined speed on ring ripple, and circular sheet material drawing is deformed into and ring
On ripple under mould A and ring ripple after mould A fittings, pressurize certain time.
(3) mould A backhauls on ring ripple, by 180 ° of deformable circular turning plate, mould B centers under ring ripple is positioned over, make change
The crest and trough of shape circle sheet material are relative with trough junction with mould B crest under ring ripple respectively, adjust positioning screw again,
After deformable circular sheet material is accurately positioned with mould B centers under ring ripple, start hydraulic press, mould B starts according to predetermined speed on ring ripple
It is descending, by circular sheet material drawing be deformed into after mould B is bonded under mould B on ring ripple and ring ripple, pressurize certain time.
(4) mould B backhauls on ring ripple, by 180 ° of deformable circular turning plate, mould A centers under ring ripple is positioned over, make change
The crest and trough of shape circle sheet material are relative with trough junction with mould A crest under ring ripple respectively, adjust positioning screw, make change
After mould A centers are accurately positioned under shape circle sheet material and ring ripple, starting hydraulic press, mould A starts descending according to predetermined speed on ring ripple,
By circular sheet material drawing be deformed into after mould A is bonded under mould A on ring ripple and ring ripple, pressurize certain time；
(5) repeat step (3)~(4) 2~3 times, by deformable circular sheet material drawing to predetermined deformation, crystal grain refinement is to predetermined
Size；
(6) the deformable circular sheet material Jing Guo step (5) is slowly flattened with pressing die, after obtaining crystallite dimension refinement
Smooth circular sheet material.
Wherein, mould A on the ring ripple described in step (3)~(4), on ring ripple mould B start according to predetermined speed it is descending, specifically
First to make mould A on ring ripple, mould B starts fast downlink on ring ripple, at a distance of about 0.5mm, then makes mould A, ring on ring ripple to circular sheet material
It is slowly descending to be reduced to 0.05~0.10mm/min for mould B downstream rates on ripple.Pressurize certain time described in step (3)~(4)
For 1~2min of pressurize.
Present invention process using inventive die can in the range of sheet material allowable strain, by few rolling pass of trying one's best,
Big plastic deformation as far as possible, substantial amounts of strain is accumulated, and Strain Distribution can be made uniform.Present invention process can make plate at room temperature
The volume of timber tires out big plastic deformation, and the chi of each ring ripple of inventive die is rationally designed on the basis of Mechanics Calculation and analogue simulation
It is very little, can be repeatedly repeatedly after drawing so that sheet material accumulates a large amount of, uniform plastic deformation everywhere.
The present invention has the following advantages that compared with prior art：
(1) a large amount of plastic strains of difficult-to-deformation material can be achieved in drawing severe deformation technique to sheet material ring ripple at normal temperatures repeatedly,
Optimize sheet material microstructure and mechanical property；
(2) mould structure is simple, easy to operate, and mould has alignment system, and deformation process is controllable, has rigorous mechanics to transport
Calculate and analogue simulation, precision are high；
(3) in forming process, deflection is smaller, but the plastic strain accumulated is larger, and microcosmic uniform in repetitive process
Change degree is high, and plate property is uniform and stable after deformation；
(4) two sets of not contour mould alternating drawings, eliminate deformation dead band and small strain area, and drawing is strong repeatedly for sheet material ring ripple
Deformation technique mould is axially symmetric structure, can preferably improve the anisotropy of original plate and existing forming technology, make
For sheet material microstructure radially and tangentially evenly, sheet material macro-mechanical property is also more stable；
(5) do not limited by molded part size, large-sized sheet material can be processed.
(6) combination property of the physics, chemistry, mechanics of sheet material etc. is significantly improved, especially in deformation uniformity side
, there is significant improvement in face, more existing sheet material severe deformation technique.Repeatedly after drawing, sheet material is present significantly to be become single collar ripple mould
Shape area and Light deformation area, prominent deformation zone grain refining effect is preferable, and Light deformation area grain refining effect is poor, sheet material after deformation
Total grain size fluctuates between 1-10 μm, and deformation uniformity is poor.The interlaced ring ripple mould of two sets of waveforms is drawn repeatedly
Delay, sheet material radially has notable deformation, eliminates Light deformation area, sheet material total grain size ripple between 1-3 μm after deformation
Dynamic, deformation uniformity is preferable, and plate property has also obtained larger lifting.
Brief description of the drawings
Fig. 1 is ring ripple mould A main view schematic diagrams of the present invention.
Fig. 2 is the vertical view simplified schematic diagram that Fig. 1 removes mould A on division ring ripple.
Fig. 3 is Fig. 2 A-A views.
Fig. 4 is the ring wave structure schematic diagram of mould A under ring ripple.
Fig. 5 is the ring ripple enlarged drawing of mould A under Fig. 4 ring ripples.
Fig. 6 is ring ripple mould B main view schematic diagrams of the present invention.
Fig. 7 is the vertical view simplified schematic diagram that Fig. 6 removes mould B on division ring ripple.
Fig. 8 is Fig. 7 B-B views.
Fig. 9 is the ring wave structure schematic diagram of mould B under ring ripple.
Figure 10 is the ring ripple enlarged drawing of mould B under Fig. 9 ring ripples.
Figure 11 is mould A and mould B waveform relative position schematic diagrames under ring ripple under ring ripple.
Figure 12 is the schematic top plan view of mould under pressing die.
Figure 13 is Figure 12 C-C views.
Figure 14 is sheet material schematic cross-section after each passage drawing of the present invention.
In figure：1- position blocks A, 2- retaining spring A, 3- positioning screw A, 4- nut A, 5- soket head cap screw A, 6- connection
Part, mould A, 10- guide pin bushing A, 11- position block B, 12- retaining spring B on mould A, 8- guide pillar A, 9- ring ripple under 7- ring ripples, 13- positioning
Mould B on mould B, 18- guide pillar B, 19- ring ripple under screw rod B, 14- nut B, 15- soket head cap screw B, 16- connector B, 17- ring ripple,
20- guide pin bushings B, 21- pressing die guide pillar, mould under 22- pressing dies, mould on 23- pressing dies, 24- pressing die guide pin bushings；S1~
S6Each ring ripple location dimensions of-ring ripple mould A, R1~R7Each ring ripple radiuses of-ring ripple mould A, h1~h6Each ring ripple ripples of mould A under-ring ripple
The height of peak and trough to top surface；L1~L6Each ring ripple location dimensions of-ring ripple mould B, r1~r7Each ring ripples of-ring ripple mould B half
Footpath, H1~H6The height of each ring ripple crests of mould B and trough to top surface under-ring ripple；(a)-original plate of passage 1, (b)-passage 2 are drawn
Delay sheet material, sheet material after the drawing of (c)-passage 3, sheet material after the drawing of (d)-passage 4, sheet material after the 5a drawings of (e)-passage, (f)-road
Sheet material after secondary 5b drawings, sheet material after the 5a drawings of (g)-passage, sheet material after (h)-passage 6 flattens.
Embodiment
Below in conjunction with the accompanying drawings and embodiment the present invention will be further described：
In the sheet material ring ripple shown in Fig. 1, Fig. 2 and Fig. 3 repeatedly drawing severe deformation mould A simplified schematic diagram, ring ripple mould A
It is made up of mould A7 under mould A9 on ring ripple and ring ripple, it is axisymmetric cylindrical structural, and its relative upper and lower surface is by some
The ring ripple that the convex-concave of the number of turns continuously can alternately coincide is formed, and the ring ripple radian and length of axis center are larger, and wave height is smaller, from
Axis center is outside, and ring ripple radian and length from coil to coil reduce, the increase of wave height from coil to coil；Specifically as shown in Figure 4 and Figure 5, mould A tables under ring ripple
By 3 circle convex-concaves, continuously alternate ring ripple is formed in face, and mould A ring ripple matches with the ring ripple of mould A on ring ripple under ring ripple, in mechanics
Calculate and determine that each ring ripple dimensional parameters are on the basis of analogue simulation：L1=16.5mm, L2=27.5mm, L3=37.5mm, L4
=47.5mm, L5=57.5mm, L6=65.5mm, R1=15.5mm, R2=5.3mm, R3=3.8mm, R4=4mm, R5=
3.1mm,R6=3.2mm, R7=2mm, H1=0.4mm, H2=2mm, H3=0.3mm, H4=2.1mm, H5=0.15mm, H6=
2.46mm.Above-mentioned size is according to board dimension 88mm, determines that ring wave number mesh for 5 circles, ensures the ring ripple cover ring of ring ripple mould
Shape sheet material.Ring ripple size design：Using Finite Element Simulation Software, simulate repeatedly, ensure each drawing deformation especially for the first time
After deformation, the maximum strain amount that sheet material is accumulated is no more than strain value of the sheet material in simple tension plastic instability, and becomes every time
After shape, each crest is maximum and close with accumulation strain at trough.In addition, in drawing process, sheet material each several part carries out subregion, point
Each several part stress, strain are analysed, and according to suitable yield criterion, checks each area's stressing conditions of sheet material, it is ensured that sheet material is not destroying
On the premise of accumulate sufficiently large strain.
Again in Fig. 1, Fig. 2 and Fig. 3, open slot is set in the end edge outside ring ripple mould A ring ripples, the open slot of upper and lower mould is relative
Form the annular groove of all wall openings, 4 uniform detent mechanisms set on the position of the annular groove, itself and under ring ripple mould week
The connected connector A6 of wall is connected by soket head cap screw A5 with mould perisporium under ring ripple, and connector is parallel with mould perisporium under ring ripple
Part is provided with through hole, sets nut A4 outside the positioning screw A3 being placed on the through hole, and the inner and position block towards center
A1 inner bolt hole threaded connection, is cased with being placed in the spring A2 between position block and connector outside positioning screw.Separately in ring ripple
Mould A positions corresponding with annular groove, provided with parallel with ring ripple mold axis and using the axis as symmetrical two groups of through holes, its
The through hole for being located at upper and lower mould is that a guide pillar A8 is set in one group, every group, and guide pin bushing A10 is set between mould on guide pillar and ring ripple.
In the sheet material ring ripple shown in Fig. 6, Fig. 7 and Fig. 8 repeatedly drawing severe deformation mould B simplified schematic diagram, ring ripple mould B
Be made up of mould B17 under mould B19 on ring ripple and ring ripple, it is axisymmetric cylindrical structural, if its relative upper and lower surface by
The ring ripple that the convex-concave of the dry number of turns continuously can alternately coincide is formed, and the ring ripple radian and length of axis center are larger, and wave height is smaller,
Outside from axis center, ring ripple radian and length from coil to coil reduce, the increase of wave height from coil to coil；Specifically as shown in Fig. 9~10, mould B under ring ripple
By 3 circle convex-concaves, continuously alternate ring ripple is formed on surface, refer to the attached drawing 11, the ring ripple phase of the ring ripple and mould on ring ripple of mould under ring ripple
It coincide, determines that each ring ripple dimensional parameters are on the basis of Mechanics Calculation and analogue simulation：l1=12.5mm, l2=22mm, l3=
32.5mm,l4=42.5mm, l5=52.5mm, l6=61mm, r1=11.5mm, r2=4.8mm, r3=4.3mm, r4=3.5mm,
r5=3.6mm, r6=2.7mm, r7=2mm, h1=0.8mm, h2=1.9mm, h3=0.4mm, h4=2.0mm, h5=0.25mm,
h6=2.36mm.Ring ripple mould B ring wave number mesh is identical with ring ripple mould A, and each ring wave height and ring ripple mould A are essentially identical,
It is corresponding with ring ripple mould A crest and trough junction respectively at crest, trough.
Again in Fig. 6, Fig. 7 and Fig. 8, open slot is set in the end edge outside ring ripple mould B ring ripples, the open slot of upper and lower mould is relative
Form the annular groove of all wall openings, 4 uniform detent mechanisms set on the position of the annular groove, itself and under ring ripple mould week
The connected connector B16 of wall is connected by soket head cap screw B15 with mould perisporium under ring ripple, and connector is parallel with mould perisporium under ring ripple
Part be provided with through hole, set nut B14 outside the positioning screw B13 being placed on the through hole, and the inner and positioning towards center
Block B11 inner bolt hole threaded connection, is cased with being placed in the spring B 12 between position block and connector outside positioning screw.Separately
In ring ripple mould B positions corresponding with annular groove, provided with parallel with ring ripple mold axis and using the axis as symmetrical two groups
Through hole, it is that a guide pillar B18 is set in one group, every group that it, which is located at the through hole of upper and lower mould, and guide pin bushing is set between mould on guide pillar and ring ripple
B20。
The geometric center of cardiac wave overlaps with cardiac wave in ring ripple mould A in the ring ripple mould B, is all axis center.Except center
It is corresponding with trough junction with ring ripple mould A crest respectively at ring ripple mould B crests, trough outside ripple；The ring ripple mould A,
Mould A on the ring ripple that B is included, mould B is connected with the moved cross beam of hydraulic press respectively on ring ripple, ring ripple mould A, B bag
Mould B is fixed on work top by the sill of hydraulic press respectively under mould A, ring ripple under the ring ripple contained, and mould is dynamic model on ring ripple,
Mould is cover half under ring ripple.After each drawing deformation especially deforms for the first time, the maximum strain amount that sheet material is accumulated is no more than plate
Strain value of the material in simple tension plastic instability, and every time after deformation, each crest is maximum and close with accumulation strain at trough.
The number of turns of ring ripple annular sheet metal is completely covered using the ring ripple of ring ripple mould or be slightly less than ring ripple sheet material, it is appropriate leave flange as according to
According to.Ring ripple mould A and ring ripple mould B corresponding relation：At ring ripple mould B crests, trough respectively with ring ripple mould A crest with
Trough junction is corresponding, with the uniformity of sheet material after guarantee repeatedly drawing.
Embodiment
To a diameter of 88mm, the 5083Al alloy circles sheet material (original plate, hereinafter referred to as sheet material) that thickness is 0.63mm, enter
Row ring ripple drawing severe deformation, including following passage repeatedly：
Passage 1：Sheet material is placed under ring ripple shown in such as Figure 14 (a) of mould A7 centers, adjusts positioning screw A3, calibration
Sheet material and mould A7 centers accurate alignment under ring ripple.
Passage 2：Start hydraulic press, mould A9 on ring ripple is started fast downlink extremely with sheet material at a distance of about 0.5mm, then make ring
It is slowly descending to be reduced to 0.05mm/min for mould A9 downstream rates on ripple, and sheet material drawing is deformed into and mould under mould A9 on ring ripple and ring ripple
After A7 fittings, pressurize 1min.
Shown in deformation sheet material section such as Figure 14 (b) after the drawing of passage 2, the deformation sheet material outside diameter after drawing
85mm, deformed area sheet material average wall thickness are thinned to 0.621mm, and average equivalent strain is 0.25, and average grain size is by original
30 μm are changed into 18 μm.
Passage 3：Mould A9 backhauls on ring ripple, 180 ° of turning plate of deformation is positioned over mould B17 centers under ring ripple, makes change
The crest and trough of shape sheet material are relative with mould B trough and crest junction under mould B, ring ripple on ring ripple respectively, and regulation is fixed again
Position screw rod B13, after deformation sheet material is accurately positioned with mould B17 centers under ring ripple, start hydraulic press, first open mould B19 on ring ripple
Beginning fast downlink at a distance of about 0.5mm, then mould B19 downstream rates is reduced to 0.05mm/min slowly descending with sheet material,
By sheet material drawing be deformed into after mould B17 is bonded under mould B19 on ring ripple and ring ripple, pressurize 1min.
Shown in deformation sheet material section such as Figure 14 (c) after the drawing of passage 3, the deformation sheet material outside diameter after drawing
85.1mm, deformed area sheet material average wall thickness are thinned to 0.62mm, and average equivalent strain is 0.45, and average grain size is by passage 2
18 μm after deformation are changed into 10 μm.
Passage 4：Mould B19 backhauls on ring ripple, 180 ° of turning plate of deformation is positioned over mould A7 centers under ring ripple, makes change
The crest and trough of shape sheet material are relative with mould A trough and crest junction under mould A, ring ripple on ring ripple respectively, regulation positioning spiral shell
Bar A3, make after mould A7 centers are accurately positioned under deformation sheet material and ring ripple, to start hydraulic press, first make on ring ripple mould A9 start it is quick under
Row is at a distance of about 0.5mm, then mould A9 downstream rates is reduced to 0.05mm/min slowly descending with sheet material, by sheet material drawing
Be deformed into after mould A7 is bonded under mould A9 on ring ripple and ring ripple, pressurize 1min.
Shown in deformation sheet material section such as Figure 14 (d) after the drawing of passage 4, the deformation sheet material outside diameter after drawing
85.15mm, deformed area sheet material average wall thickness are thinned to 0.62mm, and average equivalent strain is 0.7, and average grain size is by passage 2
10 μm after deformation are changed into 6 μm
Passage 5a：Passage 3 is repeated, deformation sheet material is subjected to drawing, deformation sheet material section such as Figure 14 (e) institutes after drawing
Show, deform sheet material outside diameter 85.15mm, deformed area sheet material average wall thickness is thinned to 0.62mm, and average equivalent strain is 0.9,
6 μm after average grain size is deformed from passage 3 are changed into 4 μm.
Passage 5b：Passage 4 is repeated, deformation sheet material is subjected to drawing, sheet material section such as Figure 14 (f) institutes after this time deforming
Show, the deformation sheet material outside diameter 85.18mm after drawing, deformed area sheet material average wall thickness is thinned to 0.618mm, and average equivalent should
It is changed into 1.05,4 μm after average grain size is deformed from passage (5a) are changed into 2 μm.
Passage 5c：Passage 3 is repeated, deformation sheet material is subjected to drawing again, sheet material section such as Figure 14 (g) after this time deforming
Shown, the deformation sheet material outside diameter 85.18mm after drawing, deformed area sheet material average wall thickness is thinned to 0.618mm, average equivalent
Strain as 1.15,2 μm after average grain size is deformed from passage (5a) are changed into 1.2 μm.Now, sheet material drawing will be deformed extremely
Predetermined deformation, crystal grain refinement to preliminary dimension.
Passage 6：By by the pressing similar to ring ripple mould of the structure shown in passage 5c deformed plate timber-used Figure 12, Figure 13
Mould slowly flattens, and obtains the smooth sheet material after crystallite dimension refinement.The pressing die by flatten upper mould 23, flatten lower mould 22,
Flatten guide pillar 21 and flatten guide pin bushing 24 and form, but the relative face of upper and lower mould is plane.Smooth sheet material section after pressing is such as
Shown in Figure 14 (h), the smooth sheet material outside diameter 88.1mm after pressing, deformed area sheet material average wall thickness is thinned to 0.62mm, puts down
Impartial effect is changed into 1.25, and the average grain size of sheet material is changed into 1 μm from 1.2 μm after passage 4b drawings after final pressing.
Claims (4)
- A kind of 1. sheet material ring ripple drawing severe deformation mould repeatedly, it is characterised in that：Mould is that two collar ripple moulds are ring ripple mould A, ring ripple mould B, the ring ripple mould A, ring ripple mould B form by mould under ring ripple mold and ring ripple, i.e., mould on ring ripple Has A, mould B under mould A, ring ripple mold B and ring ripple under ring ripple, mould A, ring ripple mold under ring ripple mold A, ring ripple Mould B is axisymmetric cylindrical structural under B and ring ripple, and its relative upper and lower surface is continuously handed over by the convex-concave of some number of turns Formed for the ring ripple that can be coincide, and the ring ripple radian and length of axis center are larger, and wave height is smaller, outside from axis center, ring ripple Radian and length from coil to coil reduce, the increase of wave height from coil to coil；The geometric center of cardiac wave and ring ripple mould A centers in the ring ripple mould B Ripple overlaps, and is all axis center, in addition to middle cardiac wave, the crest and trough with ring ripple mould A respectively at ring ripple mould B crests, trough Junction is corresponding, mould A on the ring ripple that described ring ripple mould A, B are included, mould B moved cross beam phases with hydraulic press respectively on ring ripple Connect, mould B is fixed on work by the sill of hydraulic press respectively under mould A, ring ripple under the ring ripple that described ring ripple mould A, B are included Make on table top, mould is dynamic model on ring ripple, and mould is cover half under ring ripple.
- 2. sheet material ring ripple according to claim 1 drawing severe deformation mould repeatedly, it is characterised in that：Ring ripple mould A, B ring Open slot, the relative annular groove for forming all wall openings of open slot of upper and lower mould, in the annular groove are set in end edge outside ripple Set 4 uniform detent mechanisms on position, in the detent mechanism, and the connector that mould perisporium is connected under ring ripple, its with ring ripple The parallel part of mould perisporium is provided with through hole, sets nut outside the positioning screw being placed on the through hole, and towards center the inner with The inner bolt hole threaded connection of position block, is cased with being placed in the retaining spring between position block and connector outside positioning screw.
- 3. sheet material ring ripple according to claim 2 drawing severe deformation mould repeatedly, it is characterised in that：It is close in ring ripple mould The position on periphery, provided with parallel with ring ripple mold axis and using the axis as symmetrical two groups of through holes, it is located at the logical of upper and lower mould Kong Weiyi groups, set a guide pillar in every group, and guide pin bushing is set between mould on guide pillar and ring ripple.
- A kind of 4. sheet material ring ripple described in claim 1 drawing severe deformation processing method repeatedly, it is characterised in that：(1) circular sheet material is placed on mould A centers under ring ripple, adjusts positioning screw, calibrate circular sheet material and mould A under ring ripple Center accurate alignment；(2) start hydraulic press, mould A starts descending according to predetermined speed on ring ripple, by circular sheet material drawing be deformed into on ring ripple Under mould A and ring ripple after mould A fittings, pressurize certain time；(3) mould A backhauls on ring ripple, by 180 ° of deformable circular turning plate, mould B centers under ring ripple is positioned over, justify deformation The crest and trough of shape sheet material are relative with trough junction with mould B crest under ring ripple respectively, adjust positioning screw again, make change After mould B centers are accurately positioned under shape circle sheet material and ring ripple, starting hydraulic press, mould B starts descending according to predetermined speed on ring ripple, By circular sheet material drawing be deformed into after mould B is bonded under mould B on ring ripple and ring ripple, pressurize certain time；(4) mould B backhauls on ring ripple, by 180 ° of deformable circular turning plate, mould A centers under ring ripple is positioned over, justify deformation The crest and trough of shape sheet material are relative with trough junction with mould A crest under ring ripple respectively, adjust positioning screw, justify deformation After mould A centers are accurately positioned under shape sheet material and ring ripple, start hydraulic press, mould A starts descending according to predetermined speed on ring ripple, by circle Shape sheet material drawing be deformed into after mould A is bonded under mould A on ring ripple and ring ripple, pressurize certain time；(5) repeat step (3)~(4) 2~3 times, by deformable circular sheet material drawing to predetermined deformation, crystal grain refinement to pre- scale It is very little；(6) the deformable circular sheet material Jing Guo step (5) is slowly flattened with pressing die, obtained smooth after crystallite dimension refinement Circular sheet material；Wherein, mould A on the ring ripple described in step (3)~(4), mould B starts descending according to predetermined speed on ring ripple, be specially first Make mould A on ring ripple, mould B starts fast downlink on ring ripple at a distance of about 0.5mm, then makes mould A on ring ripple, on ring ripple to circular sheet material Mould B downstream rates are reduced to that 0.05~0.10mm/min is slowly descending, and the pressurize certain time described in step (3)~(4) is protects Press 1~2min.
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| CN110330355A (en) * | 2019-07-09 | 2019-10-15 | 西北工业大学 | A kind of mold preparing ceramic matric composite waveform spring and method |
| CN110614429A (en) * | 2019-08-23 | 2019-12-27 | 江苏大学 | Laser-induced cavitation forming device and method |
| CN110918788A (en) * | 2019-12-04 | 2020-03-27 | 徐州天骋智能科技有限公司 | Steel extrusion forming device |
| CN111633101A (en) * | 2020-06-10 | 2020-09-08 | 燕山大学 | Repeated thinning, bending and strong deformation process for plates |
| CN111633070A (en) * | 2020-06-10 | 2020-09-08 | 燕山大学 | Repeated multi-layer bending strong deformation die and use method thereof |
| CN112588855A (en) * | 2020-12-11 | 2021-04-02 | 上海交通大学 | Preparation method of metal material |
| CN113279491A (en) * | 2021-06-09 | 2021-08-20 | 中国二十冶集团有限公司 | Expansion joint connecting plate for large-span reticulated shell roof panel and construction method |
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| CN113279491A (en) * | 2021-06-09 | 2021-08-20 | 中国二十冶集团有限公司 | Expansion joint connecting plate for large-span reticulated shell roof panel and construction method |
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