CN108787843A - A method of promoting alloy plate material drawing forming limit - Google Patents
A method of promoting alloy plate material drawing forming limit Download PDFInfo
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- CN108787843A CN108787843A CN201810569880.2A CN201810569880A CN108787843A CN 108787843 A CN108787843 A CN 108787843A CN 201810569880 A CN201810569880 A CN 201810569880A CN 108787843 A CN108787843 A CN 108787843A
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- rubber layer
- alloy plate
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Classifications
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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
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/201—Work-pieces; preparation of the work-pieces, e.g. lubricating, coating
-
- 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
- B21D37/18—Lubricating, e.g. lubricating tool and workpiece simultaneously
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
- B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
- B29C65/481—Non-reactive adhesives, e.g. physically hardening adhesives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/45—Joining of substantially the whole surface of the articles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The present invention relates to a kind of methods promoting alloy plate material drawing forming limit.Described method includes following steps：S1：In alloy plate material placement surface adhesive rubber layer upward；The rubber layer is nitrile rubber, fluorubber, neoprene or natural rubber, and the thickness of the rubber layer is not less than 0.8mm；S2：Lubricant is coated on alloy plate material, carries out drawing up to Al-alloy Cup-shaped.The method provided by the invention for promoting alloy plate material drawing forming limit increases the frictional force between alloy plate material and punch-pin using the mating reaction of specific rubber layer and lubricant, reduce the tensile stress at Al-alloy Cup-shaped fillet position, reduce its strain, to reduce the reduction and earing rate of material at drawing punch-pin, it greatly reduces risk of rupture and promotes forming quality, the drawing and forming performance under single working procedure states to improve aluminum alloy plate materials.
Description
A method of alloy plate material drawing forming limit is promoted, is included the following steps：
S1：In the surface adhesive rubber layer that alloy plate material is placed upward；The rubber layer be nitrile rubber, fluorubber,
The thickness of neoprene or natural rubber, the rubber layer is not less than 0.8mm；
S2：Lubricant is coated on alloy plate material, carries out drawing up to Al-alloy Cup-shaped.
Conventional deep-drawing technique is the blank holder center being positioned over alloy plate material in drawing and forming mold, then
Lubricating oil is coated in the upper and lower surface of alloy plate material, carries out drawing.
The method provided by the invention for promoting alloy plate material drawing forming limit utilizes specific rubber layer and lubricant
Mating reaction increase the frictional force between alloy plate material and punch-pin, the drawing for reducing Al-alloy Cup-shaped fillet position answers
Power reduces its strain, to reduce the reduction and earing rate of material at drawing punch-pin, greatly reduces risk of rupture and carries
Rise forming quality, the drawing and forming performance under single working procedure states to improve aluminum alloy plate materials.
It should be understood that the maximum gauge of rubber layer should be not more than the thickness of clearance between punch and die.
Wherein, the increasing of rubber, which rubs performance, and corresponding thickness indication is the key that influences drawing forming limit and promotes effect
Factor, the excellent increasing frictional behaviour performances of the rubber such as nitrile rubber, fluorubber, neoprene or natural rubber can provide suitable
Frictional force, and the performances such as its high-low temperature resistant, ageing-resistant, easy bonding can expand the usage scenario of the technique significantly, carry significantly
Rise Deep Drawing Limit performance.And rubber thickness is too thin, be easy to cause plastic force in drawing process it is excessive so that rubber rupture lose increasing
It rubs effect；And limited by clearance between punch and die, if rubber thickness is more than clearance between punch and die, blocked up to be easy to cause cup shell flowing tired
Difficulty causes drawing so that drawing and forming effect reduces instead, by choosing appropriate rubber types and according to drawing and forming
Mold chooses appropriate rubber types and thickness, and drawing forming limit can be promoted 21% by maximum.
It should be understood that lubricant is coated between cavity plate and plate and between plate and blank holder, wherein plate
The drawing position contacted with punch-pin is without lubrication.
Preferably, the rubber layer is nitrile rubber.
Preferably, the thickness of the rubber layer is 0.8~2mm.
It is further preferable that the thickness of the rubber layer is 1mm.
To obtain Al-alloy Cup-shaped, the alloy plate material is circle, and the rubber layer is rubber layer washer, the rubber
The internal diameter of glue-line washer is less than the diameter of punch-pin；The outer diameter of the rubber layer washer is more than the diameter of punch-pin；The rubber layer
Center is overlapped with the center of the punch-pin.
Preferably, the internal diameter of the rubber layer washer is：
DInternal diameter=DConvex mould diameter(0.5~4) rPunch ratius；
The outer diameter of the rubber layer washer is：
DOuter diameter=DConvex mould diameter+ (0.5~4) rPunch ratius。
It is further preferable that the internal diameter of the rubber layer washer is：
DInternal diameter=DConvex mould diameter-2rPunch ratius；
The outer diameter of the rubber layer washer is：
DOuter diameter=DConvex mould diameter+2rPunch ratius。
The internal diameter of rubber layer is that convex mould diameter subtracts twice of punch ratius, and outer diameter is that convex mould diameter adds twice of punch-pin
When radius of corner, it can not only realize that better Deep Drawing Limit promoted effect, but also rubber layer cost can be saved.
Preferably, the rubber layer is bonded in by bonding agent on the alloy plate material.
It in order to provide better bonding force, and convenient for subsequent stripping and avoids remaining, it is preferable that the bonding agent is glue
Water, instant drying adhesive, AB glue or epoxide-resin glue.
Preferably, the bonding agent is 502 glue.
Preferably, further include compaction step after the rubber layer is bonded in by bonding agent on the alloy plate material.
It is further preferable that the compaction step is：Weight using quality more than 5kg compresses abutting edge.
Preferably, the lubricating oil is polytetrafluoroethylene (PTFE) lubricant, lubricating oil, lubricating grease, molybdenum disulfide or graphite lubrication
Agent.
It is further preferable that the lubricating oil is polytetrafluoroethylene (PTFE) lubricant；The polytetrafluoroethylene (PTFE) lubricant moistens for film
Lubrication prescription, advantage are not bonded with product, and lubricant is easily removed from finished product.
Polytetrafluoroethylene (PTFE) lubricant, avoidable lubricating oil is selected to be flowed between rubber layer and alloy plate material.
Preferably, the thickness of the film is 0.5mm, friction coefficient 0.04.
Preferably, the condition of drawing described in S2 is：Punch-pin deep drawing speed is the forming speed of 50~400mm/min, is drawn
Deep unit blank holder force is 2.5~3.5Mpa.
It is further preferable that the punch-pin deep drawing speed is 200mm/min.
A kind of aluminium alloy blank material is also claimed in the present invention, and the aluminium alloy blank material is prepared by the above method
It arrives.
Compared with prior art, the present invention has the advantages that：
Method provided by the invention increases friction using the mating reaction of specific rubber layer and lubricant, reduces aluminium
The tensile stress of alloy plate corner, reduces its strain, to reduce the reduction and earing rate of material at drawing punch-pin, significantly
It reduces risk of rupture and promotes forming quality, the drawing and forming performance under single working procedure states to improve aluminum alloy plate materials.
Description of the drawings
Fig. 1 is the drawing schematic diagram that embodiment 1 provides；
Fig. 2 is the cupping tool schematic diagram that embodiment 1 provides.
Specific implementation mode
With reference to embodiment, the present invention is further explained.These embodiments are merely to illustrate the present invention rather than limitation
The scope of the present invention.Test method without specific conditions in lower example embodiment usually according to this field normal condition or is pressed
The condition suggested according to manufacturer；Used raw material, reagent etc., unless otherwise specified, being can be from the business such as conventional market
The raw materials and reagents that approach obtains.The variation for any unsubstantiality that those skilled in the art is done on the basis of the present invention
And it replaces and belongs to scope of the present invention.
Embodiment 1
A kind of process promoting alloy plate material drawing forming limit, includes the following steps (such as Fig. 1 and Fig. 2)：
According to drawing cavity plate and blank holder size in alloy plate material forming limit, by forcing press punching or
Wire cutting machine tool processes round drawing plank.
6061 aluminium alloys are grouped as by the group of following mass fraction：Magnesium 1.0%, silicon 0.6%, iron 0.7%, copper 0.2%, chromium
0.25%, titanium 0.15%, remaining is aluminium.Subsequent embodiment and comparative example carry out Deep Drawing Limit promotion and survey with the aluminium alloy
Examination.
Thickness is bonded and is waited for by bonding agent (502 glue) for 1mm annulus rubber washer (nitrile rubber) circle of drawing
Shape plate center surface, with abutting edge is tightly compressed with weight (quality is more than 5kg) immediately after bonding, the continuous weight time is more than
2min.Wherein, the thickness of the aluminium alloy plate is 1.2mm；The rubber layer is rubber layer washer, the convex mould diameter (Dp) be
The internal diameter of 50mm, punch ratius 6mm, the rubber layer washer are 38mm, outer diameter 62mm, this embodiment rubber width
For 12mm.
By lubricant thin film polytetrafluoroethylene (PTFE) be made with plate circular membrane of the same size, and will be wherein in one sheet of film
It is emptied out at the heart and drawing convex mould diameter center circle of the same size.
The polytetrafluoroethylene film of non-digging is positioned over cavity plate and contacts side with plate, the film emptied is placed in plate
With blank holder side.
It is 200mm/min in punch-pin deep drawing speed, cupuliform is carried out under the molding condition that the unit blank holder force of drawing is 3MPa
Part drawing and forming.
Deep Drawing Limit is tested by standard GB/T/T 15825.3-2008, specific as follows：By increasing plate step by step
The diameter of material obtains under the lubricating condition, and energy drawing is at the maximum specimen finish of cup body, the calculating of the maximum specimen finish
Formula is shown below.
Symbol description：
D0"-when the rupture number of certain level-one sample is less than 3, and after diameter increases level-one, the number of specimen broke is equal to
Or it is more than 4, specimen finish is recorded as D at this time0″
X-works as Do=D0" when, the Specimen Number ruptured in one group of sample, X<3
Y-works as Do=(D0″)i+1When, the Specimen Number ruptured in one group of sample, 4<Y<6
ΔD0The size of-adjacent two-stage specimen finish is differential
Z-works as Do=(D0″)i+1Uncracked Specimen Number, Z≤2
D0- specimen finish
Test result is as follows table 1.
1 Deep Drawing Limit test result of table
It is computed, (D0) max=115mm, wherein DpFor convex mould diameter (50mm).
It can be obtained according to the calculation formula of limited drawing ratio (LDR)：
LDR=(D0)max/Dp=2.3.
Embodiment 2
A kind of process promoting alloy plate material drawing forming limit, includes the following steps：
According to drawing cavity plate and blank holder size in alloy plate material forming limit, by forcing press punching or
Wire cutting machine tool processes round drawing plank.
Thickness is bonded in for 0.8mm annulus rubber washer (neoprene) by bonding agent (epoxide-resin glue) and waits for drawing
Circular plate center surface, with abutting edge is tightly compressed with weight (being more than 5KG) immediately after bonding, the continuous weight time is more than
The thickness of 2min, the aluminium alloy plate are 2mm.The rubber layer is rubber layer washer, and the thickness of the aluminium alloy plate is
1.2mm；Convex mould diameter (the Dp) it is 50mm, the internal diameter of punch ratius 6mm, the rubber layer washer are 38mm, outside
Diameter is 62mm, this embodiment rubber width is 12mm.Lubricant thin film polytetrafluoroethylene (PTFE) is made and plate circle of the same size
Shape film, and will wherein empty out and drawing convex mould diameter center circle of the same size at one sheet of film center.
It should be understood that the internal diameter of rubber layer washer is 26~47mm, outer diameter is 53~74mm, can also obtain this implementation
The identical effect of example, details are not described herein.
The polytetrafluoroethylene film of non-digging is positioned over cavity plate and contacts side with plate, the film emptied is placed in plate
With blank holder side.
It is 200mm/min in punch-pin deep drawing speed, cup is carried out under the molding condition that the unit blank holder force of drawing is 2.5MPa
Shape part drawing and forming.
Test result is as follows table 2.
2 Deep Drawing Limit test result of table
It is computed, (D0) max=112.5mm, wherein DpFor convex mould diameter (50mm).
It can be obtained according to the calculation formula of limited drawing ratio：
LDR=(D0)max/Dp=2.25.
Embodiment 3
A kind of process promoting alloy plate material drawing forming limit, includes the following steps：
According to drawing cavity plate and blank holder size in alloy plate material forming limit, by forcing press punching or
Wire cutting machine tool processes round drawing plank.
Thickness is bonded and is waited for by bonding agent (AB glue) for 2mm annulus rubber washer (natural rubber) circular slab of drawing
Expect center surface, with using weight (being more than 5KG) tightly to compress abutting edge immediately after bonding, continues the heavy time more than 2min, institute
The thickness for stating aluminium alloy plate is 1.2mm.The rubber layer is rubber layer washer, and the thickness of the aluminium alloy plate is 1.2mm；It is described
Rubber layer is rubber layer washer, the convex mould diameter (Dp) be 50mm, punch ratius 6mm, the rubber layer washer
Internal diameter is 38mm, outer diameter 62mm, this embodiment rubber width is 12mm.
By lubricant thin film polytetrafluoroethylene (PTFE) be made with plate circular membrane of the same size, and will be wherein in one sheet of film
It is emptied out at the heart and drawing convex mould diameter center circle of the same size.
The polytetrafluoroethylene film of non-digging is positioned over cavity plate and contacts side with plate, the film emptied is placed in plate
With blank holder side.
It is 200mm/min in punch-pin deep drawing speed, cupuliform is carried out under the molding condition that the unit blank holder force of drawing is 3MPa
Part drawing and forming.
Test result is as follows table 3.
3 Deep Drawing Limit test result of table
It is computed, (D0) max=115mm.
It can be obtained according to the calculation formula of limited drawing ratio：
LDR=(D0)max/Dp=2.3.
Embodiment 4
A kind of process promoting alloy plate material drawing forming limit, includes the following steps：
According to drawing cavity plate and blank holder size in alloy plate material forming limit, by forcing press punching or
Wire cutting machine tool processes round drawing plank.
Thickness is bonded and is waited for by bonding agent for 1mm annulus rubber washer (nitrile rubber) the circular plate center of drawing
Surface, with abutting edge is tightly compressed with weight (quality is more than 5kg) immediately after bonding, continuing the weight time is more than 2min, described
The thickness of aluminium alloy plate is 1.2mm.The rubber layer is rubber layer washer, and the thickness of the aluminium alloy plate is 1.2mm；The rubber
Glue-line is rubber layer washer, the convex mould diameter (Dp) be 50mm, punch ratius 6mm, the rubber layer washer it is interior
Diameter is 38mm, outer diameter 62mm, this embodiment rubber width is 12mm.
By the uniform punch-pin of graphite solid lubricant between plate and blank holder, plate and cavity plate contact surface, and still protect
Card punch-pin is not lubricated with plate contact site.
It is 200mm/min in punch-pin deep drawing speed, cupuliform is carried out under the molding condition that the unit blank holder force of drawing is 3MPa
Part drawing and forming.
Test result is as follows table 4.
4 Deep Drawing Limit test result of table
It is computed, (D0) max=98.75mm, wherein DpFor convex mould diameter (50mm).
It can be obtained according to the calculation formula of limited drawing ratio：
LDR=(D0)max/Dp=1.975.
Comparative example 1
The method that this comparative example provides is except adhesive rubber washer and lubricating condition are not changed to oil lubrication by polytetrafluoroethylene (PTFE)
In addition, remaining operation and condition are consistent with embodiment 1, as blank assay.
Test result is as follows table 5.
5 Deep Drawing Limit test result of table
(DOil) max=95mm
It can be obtained according to the calculation formula of limited drawing ratio：
LDR=(DOil)max/Dp=1.9.
By experimental result it is found that polytetrafluoroethylene (PTFE) adds rubber forced feed lubrication technique and non-adhesive rubber work under Oil Lubrication Condition
The limited drawing ratio of plate can be improved about 21% by skill compared with.
Comparative example 2
This comparative example provide method except rubber washer select polyurethane washer in addition to, remaining operation and condition with implementation
Example 1 is consistent.
Test result is as follows table 6.
6 Deep Drawing Limit test result of table
(DOil) max=96.25mm
It can be obtained according to the calculation formula of limited drawing ratio：
LDR=(DOil)max/Dp=1.925.
From the above it is found that the effect of the promotion Sheet Metal Forming Limit of polyurethane pad can not show a candle to nitrile rubber, fluorine rubber
Glue, neoprene or natural rubber.
Comparative example 3
This comparative example provide method except rubber washer select 0.5mm nitrile rubbers in addition to, remaining operation and condition with
Embodiment 1 is consistent.
Test result is as follows table 7.
7 Deep Drawing Limit test result of table
(DOil) max=94.75mm, wherein DpFor convex mould diameter (50mm).
It can be obtained according to the calculation formula of limited drawing ratio：
LDR=(DOil)max/Dp=1.895.
Table 8 is the promotion situation of the limit stretching ratio of each embodiment and comparative example.
The promotion situation of 8 limit stretching ratio of table
| Test result | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| D0MAX | 115 | 112.5 | 115 | 98.75 | 95 | 96.25 | 94.75 |
| LDR | 2.3 | 2.25 | 2.3 | 1.975 | 1.9 | 1.925 | 1.895 |
| Limit enhancing rate | 21% | 18.4% | 21% | 3.9% | Reference | 1.3% | - 0.2% |
From rubber layer thickness known to table 8 and the comparison of example 1,2,3 in 0.8~2mm thickness to promoting sheet forming pole
Limit effect is preferable, and the thickness of rubber layer upgrades great influence effect to Sheet Metal Forming Limit, from rubber layer known to comparative example 3
If relatively thin be easy to rupture in forming process, the effect of limitation punch-nose angle material flowing is lost, fails to play promotion plate
The effect of forming limit；And if the thicker resistance for flowing through cavity plate it will cause cup shell increases so that fracture tendency increases, and
It is with obvious effects in the promotion of the thickness internal shaping limit of 0.8~2mm ranges.
From embodiment 4 it is found that compared with embodiment 1 and comparative example 1, it is known that different types of lubricant is shaped to being promoted
The effect of the limit is different, and the lubricant effect of graphite is more than oil lubrication less than polytetrafluoroethylene (PTFE).
Differ from different types of rubber known to comparative example 2 to the effect for promoting Sheet Metal Forming Limit, polyurethane pad
The effect for promoting Sheet Metal Forming Limit is not so good as nitrile rubber, fluorubber, neoprene or natural rubber.
Claims (10)
1. a kind of method promoting alloy plate material drawing forming limit, which is characterized in that include the following steps：
S1：In the surface adhesive rubber layer that alloy plate material is placed upward；The rubber layer is nitrile rubber, fluorubber, neoprene
The thickness of rubber or natural rubber, the rubber layer is not less than 0.8mm；
S2：Lubricant is coated on alloy plate material, carries out drawing up to Al-alloy Cup-shaped.
2. method according to claim 1, which is characterized in that the rubber layer is nitrile rubber.
3. method according to claim 1, which is characterized in that the thickness of the rubber layer is 0.8 ~ 2mm.
4. method according to claim 1, which is characterized in that the alloy plate material is circle, and the rubber layer is rubber
Layer washer, the internal diameter of the rubber layer washer are less than the diameter of punch-pin；The outer diameter of the rubber layer washer is more than the diameter of punch-pin,
The center of the rubber layer is overlapped with the center of the punch-pin.
5. method according to claim 1, which is characterized in that the rubber layer is bonded in the aluminium alloy plate by bonding agent
On material.
6. method according to claim 5, which is characterized in that the bonding agent is glue, instant drying adhesive, AB glue or epoxy resin
Glue.
7. method according to claim 5, which is characterized in that the rubber layer is bonded in the aluminium alloy plate by bonding agent
Further include compaction step after on material.
8. method according to claim 1, which is characterized in that the lubricating oil is polytetrafluoroethylene (PTFE) lubricant, lubricating oil, profit
Consistent lubricant, molybdenum disulfide or graphitic lubricant.
9. method according to claim 1, which is characterized in that the condition of drawing described in S2 is：Punch-pin deep drawing speed be 50 ~
The unit blank holder force of 400mm/min, drawing are 2.5 ~ 3.5Mpa.
10. a kind of aluminium alloy blank material, which is characterized in that the aluminium alloy blank material is any described by claim 1 ~ 9
Method is prepared.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810569880.2A CN108787843B (en) | 2018-06-05 | 2018-06-05 | Method for improving deep drawing forming limit of aluminum alloy plate and aluminum alloy blank |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810569880.2A CN108787843B (en) | 2018-06-05 | 2018-06-05 | Method for improving deep drawing forming limit of aluminum alloy plate and aluminum alloy blank |
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| CN108787843B CN108787843B (en) | 2020-08-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110538923A (en) * | 2019-09-25 | 2019-12-06 | 中材科技(成都)有限公司 | Method for deep drawing aluminum inner container of pressure container |
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| JP2004197132A (en) * | 2002-12-17 | 2004-07-15 | Toyo Kohan Co Ltd | Resin-coated magnesium alloy sheet and method for producing formed body formed from resin-coated magnesium alloy sheet, and portable instrument boxed body |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110538923A (en) * | 2019-09-25 | 2019-12-06 | 中材科技(成都)有限公司 | Method for deep drawing aluminum inner container of pressure container |
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| Publication number | Publication date |
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| CN108787843B (en) | 2020-08-14 |
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