CN100448562C - Drawing work supplement method and drawing mould - Google Patents
Drawing work supplement method and drawing mould Download PDFInfo
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- CN100448562C CN100448562C CNB2005101240376A CN200510124037A CN100448562C CN 100448562 C CN100448562 C CN 100448562C CN B2005101240376 A CNB2005101240376 A CN B2005101240376A CN 200510124037 A CN200510124037 A CN 200510124037A CN 100448562 C CN100448562 C CN 100448562C
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- low side
- boss
- muscle
- fringe region
- lower portion
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Abstract
It relates to a extension workmanship supplementary method, stretching plate material into low end and high end materials with at least one rib being extended on the circumference of the low end material. It also provides a extension mold, with convex and concave mold are of the same shape with high end and low end and at least one boss at the surrounding area of the low end. In this way, it can supplement extension for low end material, strengthening deformation rigidity of it, eliminating partial wrinkling of the parts, reducing flowing resistance, increasing material's flow into high end material of the supplement piece to reduce the stress deformation of the material to eliminate breach.
Description
Technical field
A kind of drawing work supplement method that the present invention relates in the Sheet Metal Forming Technology reaches the drawing die of method generation thus.
Background technology
Drawing (being called pull and stretch or calendering again) is to utilize drawing die the plate blank to be struck out the method for open hollow part.The product of making is of a great variety with drawing, and can reduce three major types usually: one, and the revolving body product is as enamel basin, automobile lamp housing etc.; Two, the box-like product is as tractor tool box, automotive oil tank etc.; Three, complicated shape spare is as automobile panels such as automobile doors.
Drawing used mould mainly is made up of punch, die and blank holder three parts.When drawing, the plate blank is subjected to the power effect that punch, die and blank holder produce, and punch makes plate enter die shape chamber, and plate is drawn into reservation shape.The effect of blank holder mainly is to prevent that plate is wrinkling in drawing process all around.
In drawing work, break with wrinkling be two principal modes that draw inefficacy.Breaking mainly is the fillet place, bottom (this area is referred to as " critical section ") that occurs in product, is subjected to radially due to the tension by product in the drawing process.Wrinkling then mainly is the flange edge that occurs in product, and product is subjected to due to the hoop pressure stress in the drawing process again.The influence factor of breaking is more, comprise drawing coefficient (drawn component diameter d/plate diameter D, deformation extent when expression is drawn), plate mechanical performance, die profile radius, punch ratius, coefficient of friction, pressure-pad-force or the like, wherein, protruding, die profile radius and coefficient of friction are main influence factors.Wrinkling influence factor mainly contains the relative thickness (thickness t/plate diameter D) and the drawing coefficient of plate.
It is wrinkling to adopt blank holder effectively to prevent, promptly when drawing beginning, plate is just pushed down by blank holder, in whole drawing process, is constrained between blank holder and die two planes always, and it is wrinkling to have limited plate.But the pressure of blank holder has also increased product material flowing friction resistance simultaneously, and promptly in drawing process, owing to be subjected to the effect of pressure-pad-force, the product material is not easy to flow, thereby has strengthened the danger that the product critical section is pulled open.
For the drawing work of complicated shape spare, automotive back coaming plate for example, the problem of existence is more concentrated.For example, in attached Fig. 1 and 2, provided the schematic diagram of several automotive back coaming plates.As can be seen from the figure, these products belong to complex-shaped, and are promptly complex-shaped mostly, and surface height injustice straggly.
For drawing work, the level difference of this type of product is very big, for example up to 200 millimeter, and the undulations close proximity, so material flows extremely inhomogeneous in die.So, utilize traditional drawing work, be difficult to overcome some problems that product often occurs in drawing process, break and low side material (drawing depth materials with smaller) distortion deficiency causes product rigidity shortcoming as the excessive generation of high-end material (material that drawing depth is bigger) distortion, high-end and transition portion low side makes the local Zhe that wrinkles that produces of product owing to material deformation is inhomogeneous.
In the prior art, can take specific measure at above-mentioned specific problem, for example, when the stretching strain in die of product material is not enough, should reduce exterior material flows into, generally take to strengthen pressure-plate-force or adjust to strengthen the bead height or reduce method such as die entrance and increase the resistance that exterior material flows into, reduce the purpose that material flows into to reach.Otherwise, when the product material draws distortion excessive and when having break dangerous in die, should increase the inflow of exterior material, generally take to reduce pressure-plate-force or adjustment and reduce the bead height or increase methods such as die entrance to reduce the resistance that material flows into, increase the purpose that exterior material flows into to reach.
But, be difficult to adopt said method to adjust for this class complicated shape spare of rear side coaming plate, its reason is the particularity of this product shape, for example difference in height is very big, undulations close proximity etc.And as previously mentioned, reducing the exterior material inflow and increasing exterior material inflow itself is exactly a pair of contradiction, therefore, presses for a kind of method and can solve the problem that occurs in the above-mentioned complicated shape spare drawing work simultaneously.
Summary of the invention
Therefore, an object of the present invention is to provide a kind of drawing work supplement method, can address the above problem by this method, excessive generation is broken and low side material deformation deficiency causes product rigidity shortcoming as high-end material deformation, and high-end and transition portion low side makes the local Zhe that wrinkles that produces of product owing to material deformation is inhomogeneous.
Another object of the present invention provides a kind of drawing die that is exclusively used in said method.
This drawing work supplement method comprises board-like material is drawn the product that becomes to comprise high-end material and low side material, it is characterized in that, in drawing process, draws out at least one muscle at low side material periphery.
This drawing die comprises punch, die and blank holder, and wherein the shape of punch and die is consistent and comprise high end parts and lower portion, it is characterized in that having at least one boss on the fringe region of lower portion.
Therefore, utilize above-mentioned Supplementing Method and Drawing Dies for Drawing Process, because the periphery to product low side material draws out at least one muscle in drawing process, so can draw the later stage (when promptly drawing the low side material), can draw once more the low side material, thereby can increase low side distortion of materials degree, increase its deformation rigidity; Also suppressed the inhomogeneities that the transition portion material of high-end material of product and low side material flows into simultaneously, made this region material be launched fully and stretch drawing the later stage, thereby eliminated the local wrinkle Zhe that produces of product; And, owing to use the method for muscle to the not enough zone of local stretching strain the effect that stretches once more to be arranged drawing the later stage, so the available resistance that suitably reduces the integral material inflow, reduce the purpose that this place's material stretching strain elimination is broken thereby increase the additional high-end material of product of material inflow to reach.
Description of drawings
Fig. 1 and Fig. 2 are existing product examples with complicated shape;
Fig. 3 to Fig. 6 is respectively the schematic diagram of the expression principle of the invention;
Fig. 7 to Figure 10 is respectively the example that utilizes the product that method of the present invention and mould draw out.
The specific embodiment
According to some examples principle of the present invention is described below.
As depicted in figs. 1 and 2, for complex-shaped drawn components such as automotive back coaming plates, it not only draws out-of-shape, and draws highly generally also also unequal.The height that some part is drawn is very high, for example shown in the A part (being referred to as for convenience's sake, " high-end material " herein); Drawing of some place is highly relatively low, for example shown in B part and the C part (being referred to as " low side material " herein).And as shown in Figure 2, the height between high-end material and the low side material is sometimes also also unequal, for example the height between height between A part and the B part and A part and the C part and unequal.In addition, high-end material itself highly also might be also unequal, and the gradient that perhaps high-end edge of materials has or gradient also might be unequal, for example 90 degree or 60 degree or the like.In a word, the shape more complicated of this automotive back coaming plate.
In order to prevent that high-end material from being pulled open in drawing process, need reduce the resistance that material flows into, increase material and add to high-end material part.But when reducing the resistance of material inflow, the edge of low side material and product wrinkling can occur again.And, owing to the height between high-end material and the low side material does not wait, so the material of the transition portion between high-end material and low side material is mobile inhomogeneous in drawing process, so the regional area around high-end material also can take place wrinkling.These problems adopt existing method can't overcome at all.
Therefore, the present invention proposes a kind of drawing work supplement method, promptly in drawing process, by at least one boss being set at the punch edge, so that when the low side material is drawn, can draw once more the low side material by this boss, promptly draw out muscle in the precalculated position of low side material periphery, make the drawing ratio of whole low side material be consistent substantially, thereby can address the above problem fully basically.Muscle can be a concave bar, also can be convex tendon.The cross sectional shape of muscle can be the shape of any appropriate of the prior art, for example circular, square, triangle or the like.
As shown in the figure, when described product was drawn, at first punch drew (early stage draw) to the high-end material of product, and promptly the predetermined portions that at first touches on the board-like material of the high end parts on the punch draws into high-end material part with it.In this drawing process, along with the relative motion between punch and the die, punch is drawn in the die shape chamber board-like material generation plastic deformation with the predetermined portions of board-like material.Drawing the later stage, be that lower portion on the punch begins low side material to product when drawing, because violent plastic deformation has taken place in material when drawing early stage, so the product exterior material will be difficult to be continuously introduced to that the continuation distortion to high-end material replenishes in die shape the chamber in this moment, so high-end material pulls open easily at this moment.Therefore, in this case, can suitably reduce the outside pressure-pad-force of product in advance, to solve the problem that high-end material is pulled open easily.Yet, owing to reduced pressure-pad-force, reduced the resistance that material flows into, so when the low side material was drawn, therefore low side material deformation deficiency caused the rigidity shortcoming, and wrinkling easily.
Therefore, in the present invention, by on the lower portion fringe region of punch, boss being set, by this boss low side edge of materials zone is replenished and draw drawing the later stage, thereby can make the low side material extraly to flows outside the outside radially tension of low side material production, therefore, the low side material is well extended, increased its deformation rigidity, and prevent wrinkling.
The mobile problem of non-uniform of material for low side material and high-end material transition part has equally also obtained solution by on the lower portion fringe region of punch boss being set.For example, at high end parts and lower portion (with regard to product, be high-end material and low side material) place that difference in height is big, lack and be provided with or be not provided with boss, perhaps reduce the height of boss, because the low side material when drawing on the product will flow into high-end material part in a large number, the degree of stretch of material is bigger; In the relative less place of the difference in height of high end parts and lower portion, one or more boss can be set, perhaps increase the height of boss, draw so that the low side material is replenished by this boss, increase its degree of stretch.Therefore, the low side material is replenished draw by boss suitably is set, can be so that the degree of stretch of whole low side material be consistent substantially, thus low side distortion of materials rigidity is even, and also avoided problems such as local wrinkling and high-end material pulls open simultaneously.
The set-up mode of the boss on the punch or the particular location or the degree of drawing muscle on product low side material can be determined according to the concrete shape of product, the basic principle of determining is to make the final drawing ratio of whole low side material to be consistent basically, thereby can solve each problem of the prior art.Below with reference to Fig. 3 to Fig. 6, the formation position that position or muscle are set and the degree of boss are carried out concrete illustrating according to some specific embodiments.
As shown in Figure 3, high-end materials A and low side material B height separately equate and the height between them also equates, and the gradient of high-end materials A is also even, for example are 90 degree.Therefore, the whole drawing ratio of low side material B (being the degree of stretch of material) equates.As previously mentioned, in drawing process, at the initial stage of drawing, the product material at first flow into high-end materials A part from the outside, and along with the aggravation of material plastic deformation, degree of hardening of material strengthens gradually.Drawing the later stage, material mainly on the low side material B the material near core flow to high-end materials A part, therefore drawing the later stage, the drawing ratio of low side material B core is obviously greater than the drawing ratio of marginal portion.But because low side material drawing ratio circumferentially is being uniform, therefore on low side material B fringe region, draw out a uniform circle muscle D, thereby make the low side material B from inside to outside on the whole drawing ratio reach unanimity, thereby prevent that low side material B edge from the defective of wrinkling and undercapacity taking place.
As shown in Figure 4, the high-end materials A of product, highly also unequal apart from drawing of low side material B plane, the height of promptly high-end materials A front portion is less than the height at rear portion.As mentioned above, in drawing process, corresponding high-end materials A is drawn highly higher rear portion, and the degree that the material on the low side material B flow to wherein is bigger, and promptly drawing ratio is violent; And draw highly lower front portion for the high-end materials A of correspondence, and the degree that the material on the low side material B flow to wherein is less, and promptly drawing ratio is less.Therefore,, need be on low side material B fringe region draw the relative layback in highly higher position and prolong and muscle D, can prevent problems of the prior art thus in high-end materials A for the drawing ratio of the whole low side material B of balance.
As shown in Figure 5, the high-end materials A of product, apart from the distance at low side material B edge and unequal, the promptly high-end materials A left side apart from the distance at low side material B edge less than the distance of rightmargin from low side material B edge.Therefore, as mentioned above, in drawing process, corresponding high-end materials A the right, the degree that the material on the low side material B flow to wherein is bigger, and promptly drawing ratio is violent; And for the high-end materials A of the correspondence left side, the degree that the material on the low side material B flow to wherein is less, and promptly drawing ratio is less.Therefore, for the drawing ratio of the whole low side material B of balance, need be on low side material B fringe region relative with the high-end materials A of a distance position far away layback prolongs and muscle D, can prevent problems of the prior art thus.
As shown in Figure 6, the high-end materials A of product periphery forms draws the gradient or gradient and unequal, and the gradient (for example 90 degree) of drawing on the promptly high-end materials A left side is drawn the gradient (for example 45 degree) greater than the right.Therefore, as mentioned above, in drawing process, corresponding high-end materials A the right, the degree that the material on the low side material B flow to wherein is bigger, and promptly drawing ratio is violent; And for the high-end materials A of the correspondence left side, the degree that the material on the low side material B flow to wherein is less, and promptly drawing ratio is less.Therefore,, need be on low side material B fringe region draw the relative layback in the less position of the gradient and prolong and muscle D, can prevent problems of the prior art thus with high-end materials A for the drawing ratio of the whole low side material B of balance.Need to prove that at this drawing the gradient in theory can only be at 0 degree between 90 degree, in actual drawing process, drawing the gradient generally is between 90 degree at 30 degree.
With reference to Fig. 3 to Fig. 6,, drawing work supplement method of the present invention is illustrated above with reference to some specific embodiments according to principle of the present invention.In actual process, above-mentioned situation is normally combined mutually, shown in the instantiation of Fig. 7 to Figure 10.Therefore, in actual process, by computer-assisted analysis software, can analyze the drawing ratio on the low side material, draw not enough position in correspondence then and draw out muscle, thereby make that drawing ratio reaches unanimity on the low side material monolithic, thereby can solve the aforementioned problems in the prior.In addition, according to the principle of the invention, also can all draw out a circle muscle when needed around the low side material, the degree of depth of drawing not enough position and correspondingly increase muscle in correspondence is drawn the additional of low side material to strengthen then, can realize goal of the invention of the present invention equally.For example, described muscle can be positioned on the whole periphery of low side material, and the degree of depth of muscle to draw highly the highest position at the high-end material of correspondence the darkest; Perhaps the darkest in the high-end material distance of distance position farthest; It is the darkest perhaps to draw the position of gradient minimum at the high-end material of correspondence.
Concerning the special-purpose drawing die that is applied to drawing work supplement method of the present invention, because the shape of punch and die is consistent each other with the shape of the product that draws out, so just do not remake too many explanation at this.Schematic diagram among Fig. 3 to Fig. 6 can be used to represent punch or die equally.
Indulge the above, the boss on the punch or the setting principle of the muscle on the product are, the deformation degree of balance low side material, making it on the whole, drawing ratio reaches unanimity, the place of promptly drawing deficiency on the low side material replenishes to draw by the boss that is provided with and increases its deformation degree, thereby increase its deformation rigidity, avoid the product part wrinkling.It mainly is that flow resistance by reducing material realizes that the high-end material of avoiding product is pulled open, and for example reduces the pressure-pad-force of product, perhaps increases punch, die profile radius etc.Because follow-up additional drawing work is arranged, thus needn't worry that material is wrinkling, thus can suitably reduce the inflow resistance of material.
Claims (14)
1, a kind of drawing work supplement method, this method comprise board-like material are drawn the product that becomes to comprise high-end material and low side material, it is characterized in that, when drawing the low side material, draw out at least one muscle on described low side edge of materials zone.
2, the method for claim 1, wherein said muscle are positioned on the low side edge of materials zone draws the relative side in highly higher position with high-end material.
3, the method for claim 1, wherein said muscle are positioned at the high-end material of a distance side far away on the low side edge of materials zone.
4, the method for claim 1, wherein said muscle are positioned on the low side edge of materials zone draws the relative side in the less position of the gradient with high-end material.
5, the method for claim 1, wherein said muscle circumferentially is being formed on the fringe region of low side material continuously, and the degree of depth of muscle is in that to draw the relative side in highly higher position darker with high-end material.
6, the method for claim 1, wherein said muscle circumferentially is being formed on the fringe region of low side material continuously, and the degree of depth of muscle is darker in the high-end material of a distance side far away.
7, the method for claim 1, wherein said muscle circumferentially is being formed on the fringe region of low side material continuously, and the degree of depth of muscle is in that to draw the relative side in the less position of the gradient darker with high-end material.
8, a kind of drawing die comprises punch, die and blank holder, and wherein the shape of punch and die is consistent and comprise high end parts and lower portion, it is characterized in that having at least one boss on the fringe region of lower portion.
9, drawing die as claimed in claim 8, wherein said boss are positioned at the relative side in position higher with high end parts height on the lower portion fringe region.
10, drawing die as claimed in claim 8, wherein said boss are positioned at the high end parts of a distance side far away on the lower portion fringe region.
11, drawing die as claimed in claim 8, wherein said boss are positioned at the relative side in position less with the gradient of high end parts on the lower portion fringe region.
12, drawing die as claimed in claim 8, wherein said boss circumferentially is positioned on the fringe region of lower portion continuously, and the height of boss is higher in a side relative with the higher position of the height of high end parts.
13, drawing die as claimed in claim 8, wherein said boss circumferentially is positioned on the fringe region of lower portion continuously, and the height of boss is higher in the high end parts of a distance side far away.
14, drawing die as claimed in claim 8, wherein said boss circumferentially is positioned on the fringe region of lower portion continuously, and the height of boss is higher in a side relative with the less position of the gradient of high end parts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101240376A CN100448562C (en) | 2005-11-23 | 2005-11-23 | Drawing work supplement method and drawing mould |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101240376A CN100448562C (en) | 2005-11-23 | 2005-11-23 | Drawing work supplement method and drawing mould |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1970189A CN1970189A (en) | 2007-05-30 |
| CN100448562C true CN100448562C (en) | 2009-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005101240376A Expired - Fee Related CN100448562C (en) | 2005-11-23 | 2005-11-23 | Drawing work supplement method and drawing mould |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103962435A (en) * | 2014-04-16 | 2014-08-06 | 晋西工业集团有限责任公司 | Sheet cold extruding forming method for wide-flange conical part |
| MX2019001869A (en) * | 2016-08-18 | 2019-06-13 | Jfe Steel Corp | Method for manufacturing blank, blank, method for manufacturing press-molded article, and press-molded article. |
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| CN1043893A (en) * | 1988-12-30 | 1990-07-18 | 伊索弗姆公司 | The device of pressing sheet material |
| JPH0687029A (en) * | 1992-09-08 | 1994-03-29 | Nippon Steel Corp | Forming method excellent in deep drawing performance |
| JPH06154896A (en) * | 1992-11-16 | 1994-06-03 | Nissan Motor Co Ltd | Press forming method, press die and manufacture of press die |
| JPH09192752A (en) * | 1996-01-12 | 1997-07-29 | Nissan Motor Co Ltd | Metal sheet drawing device and method thereof drawing the same |
| JPH1043820A (en) * | 1996-07-31 | 1998-02-17 | Suzuki Motor Corp | Pressing die device |
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2005
- 2005-11-23 CN CNB2005101240376A patent/CN100448562C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1043893A (en) * | 1988-12-30 | 1990-07-18 | 伊索弗姆公司 | The device of pressing sheet material |
| JPH0687029A (en) * | 1992-09-08 | 1994-03-29 | Nippon Steel Corp | Forming method excellent in deep drawing performance |
| JPH06154896A (en) * | 1992-11-16 | 1994-06-03 | Nissan Motor Co Ltd | Press forming method, press die and manufacture of press die |
| JPH09192752A (en) * | 1996-01-12 | 1997-07-29 | Nissan Motor Co Ltd | Metal sheet drawing device and method thereof drawing the same |
| JPH1043820A (en) * | 1996-07-31 | 1998-02-17 | Suzuki Motor Corp | Pressing die device |
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| 具有台阶凸缘的盒形件拉深. 李贵方.模具工业，第12期. 1987 |
| 具有台阶凸缘的盒形件拉深. 李贵方.模具工业，第12期. 1987 * |
| 翼子板成形评估及模具调试. 喻航，刘渝，赵川，常建.金属成形工艺，第19卷第5期. 2001 |
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| CN1970189A (en) | 2007-05-30 |
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Assignee: Beijing BYD Mould Co., Ltd. Assignor: Biyadi Co., Ltd. Contract fulfillment period: 2008.4.25 to 2014.6.7 Contract record no.: 2008440000064 Denomination of invention: Drawing work supplement method and drawing mould License type: Exclusive license Record date: 20080504 |
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