CN101104184A - Drawing die based on variable blank holderforce control - Google Patents

Drawing die based on variable blank holderforce control Download PDF

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Publication number
CN101104184A
CN101104184A CNA2007100705040A CN200710070504A CN101104184A CN 101104184 A CN101104184 A CN 101104184A CN A2007100705040 A CNA2007100705040 A CN A2007100705040A CN 200710070504 A CN200710070504 A CN 200710070504A CN 101104184 A CN101104184 A CN 101104184A
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China
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pressure variable
variable edge
edge force
die
spring
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CNA2007100705040A
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CN100443211C (en
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施于庆
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Zhejiang Lover Health Science and Technology Development Co Ltd
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Zhejiang Lover Health Science and Technology Development Co Ltd
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Publication of CN100443211C publication Critical patent/CN100443211C/en
Expired - Fee Related legal-status Critical Current
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Abstract

The invention discloses a drawing die based on a variable blank holding force control. The lower end of the upper template is provided with male dies, the male dies are arranged in the holes of a middle plate and a press loop, the upper template is opened with more than three through holes, the through holes are all provided with returned material screws, returned material screws exposed from the lower end surface of the upper template are orderly arranged in the holes of an upper spring, the middle plate and a lower spring, the end parts of the returned material screws are connected with the screw thread of the press loop; an ejecting spring and a n-shaped female die are arranged in the middle of the upper end surface of the lower template, the central part of the female die is provided with a cushion block of the female die, the ejecting spring props the end surface of the cushion block of the female die, the upper end surface of the female die is opened with more than three holes, variable blank holder force bars are arranged in the holes, one ends of the variable blank holder force bars in the female die are arranged in the holes of a motion spring, the variable blank holder force cams are respectively prop the end points of the bigger ends of the variable blank holder force bars, the extended arms of the variable blank holder force cams are connected with the cushion block of the female die by a dynamic pin. Variable blank holding force control can be achieved by adding a plurality of die parts, and a drawing piece is arranged on a universal pressing machine to draw simple and changeable and complex shapes.

Description

Cupping tool based on pressure variable edge force control
Technical field
The present invention relates to the equipment that metal blank is shaped, especially relate to a kind of cupping tool based on pressure variable edge force control.
Background technology
Wrinkling is the main failure forms that thin plate draws with breaking, pressure-pad-force (blank-holder force, BHF) size (or pressure-pad-force control curve) and load mode be influence wrinkling with one of key factor of breaking, traditional pressure-pad-force control mode generally is that permanent loading of employing or increase loading mode are main, promptly descend and the constant or linear increase of pressure-pad-force maintenance with punch travel, and pressure variable edge force (Variable bkankholderforce, VBHF) control is in sheet material draw forming process, apply time dependent pressure-pad-force in stamping parts flange (as cylindrical part) the different moment of contraction, or at stamping parts flange (as box part) on diverse location, apply different time dependent pressure-pad-forces, by regulating the frictional resistance that each point positive pressure size changes blank and mould contact surface, increase the tension in the sheet material, thereby reduce the circumferential compressive force of blank, reach the control metal flow, avoid or effectively suppress wrinkling and break in the sheet material forming, improve the ability of the forming limit of the stability of the dimensional accuracy of stamping parts and punching course and sheet material.It is optimum adopting which kind of pressure-pad-force control curve in sheet metal deep drawing, is the research focus of domestic and international pressure variable edge force control always.From domestic and international result of study, pressure-pad-force control curve mainly concentrates on following several types: the theoretical control of (1) pressure-pad-force curve must follow hard on the variation of the curve that breaks and fall after rising; Minimum pressure-pad-force curve when (2) the punch tensile force reaches maximum, promptly the pressure-pad-force curve is to fall the back earlier to rise type; (3) cumulative pressure-pad-force; (4) permanent pressure-pad-force; (5) V-type pressure-pad-force; (6) pressure-pad-force decrescence (as being respectively among Fig. 1 shown in a, b, c, d, e, the f).
Result of study according to pressure-pad-force control curve, the pressure variable edge force forcing press of having developed, to the control metal flow, avoid or effectively suppress wrinkling and break in the sheet material forming, improve the stability of the dimensional accuracy of stamping parts and punching course and sheet material forming limit effect preferably arranged.But its defective following several aspect:
The pressure variable edge force forcing press can only carry out pressure variable edge force control to specific drawing part, as Box-Shaped Drawing, and 10 control points, control point (as shown in Figure 2), the position of the flanging oil cylinder at 10 control points of control box part has pre-determined,
If the drawing part of this other shapes of forcing press pull and stretch (as the car door in the automobile panel, preceding enclose etc.), the so this pressure variable edge force forcing press that is used for the pull and stretch box part just can not use.The flanging oil cylinder that is to say the pressure variable edge force forcing press can not be arranged arbitrarily with the change of shape of drawing part.At present can only be according to the drawing part of a certain type, develop be applicable to this kind drawing part pull and stretch the pressure variable edge force forcing press.
Transforming existing common single action, two moving pressure-pad-force machine, to make it to become pressure variable edge force forcing press result similar with development pressure variable edge force forcing press situation.
And the pressure variable edge force mould from having developed, effect is also unsatisfactory, only be suitable for small-sized drawing part such as cylindrical part, and have the little tonnage pressure-pad-force machine that material spilling hole is arranged on the lower table, can't resolve on different flanges position the layout different pressure variable edge force mechanism of large complicated drawing part as automobile panel.No matter as above various reasons is that pressure variable edge force forcing press or pressure variable edge force mould can't be promoted in actual production and come.
Summary of the invention
The object of the present invention is to provide a kind of cupping tool based on pressure variable edge force control, solution applies time dependent pressure-pad-force in the stamping parts different moment of contraction, or at stamping parts on diverse location, apply different time dependent pressure-pad-forces, can realize dissimilar pressure-pad-force control curve controlled drawing processes.
The present invention solves the technical scheme that its technical problem adopts, and comprises mould assembly and lower mould assembly, wherein:
1) goes up mould assembly: comprise intermediate plate, upper spring, material returned screw, lower spring, holding pad, punch, guide pin bushing and cope match-plate pattern.The punch of leaving pore is equipped with at center, cope match-plate pattern lower surface, punch is sleeved in middle plate hole and the holding pad hole from top to bottom successively, and form with middle plate hole and holding pad hole and to be slidingly matched, have the through hole more than three on the cope match-plate pattern of punch outside, material returned screw all is housed in each through hole, expose on the material returned screw of cope match-plate pattern lower surface and be sleeved on upper spring successively, in intermediate plate and the lower spring hole, material returned screw end is threaded with holding pad, have the through hole more than three on the holding pad outside the material returned screw, guide pin bushing is equipped with in the cope match-plate pattern lower end of intermediate plate and holding pad outside;
2) lower mould assembly: comprise die, pressure variable edge force bar, motion spring, bearing pin, pressure variable edge force cam, die cushion block, head part spring, spacing collar, untie-sell, alignment pin, lower bolster and guide pillar.In the spacing collar at center, lower bolster upper surface the head part spring is housed, on the lower bolster upper surface of spacing collar outside " ∏ " shape die is housed, the die cushion block is equipped with at center, " ∏ " shape die upper surface, the small end of die cushion block forms with " ∏ " shape die and is slidingly matched, the head part spring withstands on the die cushion block large end face, die cushion block center line and punch central lines, " ∏ " shape die upper surface of die cushion block outside has the through hole more than three, the pressure variable edge force bar is housed respectively in each through hole, the small end of pressure variable edge force bar stretches out the outer end of " ∏ " shape die can be corresponding one by one with the hole on the holding pad, form respectively and be slidingly matched, the small end of pressure variable edge force bar in " ∏ " shape die is sleeved in the motion spring eye, pressure variable edge force cam more than three withstands on the end points of the big end of pressure variable edge force bar separately respectively, the pressure variable edge force cam rotates around bearing pin, the cantilever arm of pressure variable edge force cam is connected with untie-sell with the big end of die cushion block, guide pillar with the guide pin bushing corresponding number of cope match-plate pattern is housed on the outer lower bolster of " ∏ " shape die, during work, guide pillar can insert to form in separately the dowel hole and be slidingly matched, simultaneously, the alignment pin on " ∏ " shape die inserts in the holding pad locating hole and locatees.
Described pressure variable edge force cam, when the drawing part of pull and stretch rule flange shape, i.e. the drawing part of the flange shape of representing with a parameter, the pattern curve of pressure variable edge force cam is identical and with Mould's Pressure Center symmetric arrangement or mould geometric center symmetric arrangement.
Described pressure variable edge force cam, when the drawing part of the irregular flange shape of pull and stretch, the i.e. drawing part of the flange shape that can not represent with a parameter, the pattern curve of pressure variable edge force cam has nothing in common with each other, and different flange shaped positions place arranges the pressure variable edge force cam of difformity curve.
The beneficial effect that the present invention has is: increase several mould parts such as intermediate plate, pressure variable edge force bar and pressure variable edge force cam by design, reach and realize pressure variable edge force control in the drawing process, improve the ability of the forming limit of the stability of the dimensional accuracy of stamping parts and punching course and sheet material.The present invention needn't be provided with special forcing press, cost is low, applicability is wide, but simple drawing part of pull and stretch such as cylindrical part, also but the drawing part such as the automobile panel of any variation of pull and stretch and complicated shape can apply time dependent pressure-pad-force in stamping parts flange (as cylindrical part) the different moment of contraction, also can be at stamping parts flange (as box part) on diverse location, apply different time dependent pressure-pad-forces, can realize dissimilar pressure-pad-force control curve controlled drawing processes.
Description of drawings
Several main types of Fig. 1 pressure-pad-force control curve.
Fig. 2 box part control point.
Lower mould assembly vertical view during state when Fig. 3 does not work.
State diagram when Fig. 4 does not work based on the cupping tool of pressure variable edge force control.
Original state figure when Fig. 5 works based on the cupping tool of pressure variable edge force control.
Fig. 6 is based on the cupping tool compacting back working state figure of pressure variable edge force control.
Among the figure: 1, intermediate plate, 2, upper spring, 3, material returned screw, 4, lower spring, 5, holding pad, 6, punch, 7, " ∏ " shape die, 8, the pressure variable edge force bar, 9, motion spring, 10, bearing pin, 11, the pressure variable edge force cam, 12, the die cushion block, 13, head part spring, 14, spacing collar, 15, untie-sell, 16, plate, 17, alignment pin, 18, lower bolster, 19, guide pillar, 20, guide pin bushing, 21, cope match-plate pattern.
The specific embodiment
As shown in Figure 3, Figure 4, the present invention includes mould assembly and lower mould assembly, wherein:
1) goes up mould assembly: comprise intermediate plate 1, upper spring 2, material returned screw 3, lower spring 4, holding pad 5, punch 6, guide pin bushing 20 and cope match-plate pattern 21.The punch 6 of leaving pore is equipped with at center, cope match-plate pattern 21 lower surface, punch 6 is sleeved in intermediate plate 1 hole and holding pad 5 holes from top to bottom successively, and form with intermediate plate 1 hole and holding pad 5 holes and to be slidingly matched, have the through hole more than three on the cope match-plate pattern 21 of punch 6 outsides, material returned screw 3 all is housed in each through hole, expose on the material returned screw 3 of cope match-plate pattern 21 lower surfaces and be sleeved on upper spring 2 successively, in intermediate plate 1 and lower spring 4 holes, material returned screw 3 ends are threaded with holding pad 5, have the through hole more than three on the holding pad 5 outside the material returned screw 3, guide pin bushing 20 is equipped with in cope match-plate pattern 21 lower ends of intermediate plate 1 and holding pad 5 outsides;
2) lower mould assembly: comprise die 7, pressure variable edge force bar 8, motion spring 9, bearing pin 10, pressure variable edge force cam 11, die cushion block 12, head part spring 13, spacing collar 14, untie-sell 15, alignment pin 17, lower bolster 18 and guide pillar 19.In the spacing collar 14 at center, lower bolster 18 upper surface head part spring 13 is housed, " ∏ " shape die 7 is housed on lower bolster 18 upper surfaces of spacing collar 14 outsides, die cushion block 12 is equipped with at center, " ∏ " shape die 7 upper surface, the small end of die cushion block 12 forms with " ∏ " shape die 7 and is slidingly matched, head part spring 13 withstands on die cushion block 12 large end faces, die cushion block 12 center lines and punch 6 central lines, " ∏ " shape die 7 upper surfaces of die cushion block 12 outsides have the through hole more than three, pressure variable edge force bar 8 is housed respectively in each through hole, the small end of pressure variable edge force bar 8 stretches out " ∏ " shape die 7 outer ends can be corresponding one by one with the hole on the holding pad 5, form respectively and be slidingly matched, the small end of pressure variable edge force bar 8 in " ∏ " shape die 7 is sleeved in motion spring 9 holes, pressure variable edge force cam 11 more than three withstands on the end points of pressure variable edge force bar 8 big ends separately respectively, pressure variable edge force cam 11 rotates around bearing pin 10, the cantilever arm of pressure variable edge force cam 11 is connected with untie-sell 15 with the big end of die cushion block 12, guide pillar 19 with guide pin bushing 20 corresponding number of cope match-plate pattern 21 is housed on the outer lower bolster 18 of " ∏ " shape die 7, during work, guide pillar 19 can insert to form in separately the dowel hole and be slidingly matched, simultaneously, the alignment pin on " ∏ " shape die 7 17 inserts in holding pad 5 locating holes and locatees.
Described pressure variable edge force cam 11, when the drawing part of pull and stretch rule flange shape, the i.e. drawing part of the flange shape of representing with a geometric parameter, the pattern curve of pressure variable edge force cam 11 is identical and with Mould's Pressure Center symmetric arrangement or mould geometric center symmetric arrangement.During as the pull and stretch cylindrical part, its flange shape is that an available diameter parameters is represented, on the initial flange of cylindrical part, with the identical pressure variable edge force cam 11 of 4 pattern curves of Mould's Pressure Center (mould geometric center) symmetric arrangement.Or on the initial flange circumference of cylindrical part, uniform 120 ° 3 pressure variable edge force cams 11 that pattern curve is identical are set with Mould's Pressure Center (how much on mould) center.
Described pressure variable edge force cam 11, when the drawing part of the irregular flange shape of pull and stretch, the i.e. drawing part of the flange shape that can not represent with a geometric parameter, the pattern curve of pressure variable edge force cam 11 has nothing in common with each other, the pressure variable edge force cam 11 that different flange shaped positions place arranges the difformity curve is during as the pull and stretch box part, box part is made up of fillet (arc) and straight flange, the box part blank shape launches and can not represent with a geometric parameter, but the blank flange shape is to be connected with the straight flange smooth transition by circular arc basically, will arrange the pressure variable edge force cam of difformity curve respectively at circular arc and straight flange place.
Operation principle of the present invention is as follows:
When last mould assembly was also not descending, punch 6 lower planes and holding pad 5 lower planes had certain difference.This moment, upper spring 2 reached first pretension state respectively with lower spring 4, as shown in Figure 3.Last mould assembly continues to come downwards to plane contact on holding pad 5 lower planes and the plate 16 that is placed on " ∏ " shape die 7, holding pad 5 keeps under the motionless situation subsequently, when punch 6 comes downwards to plane on the contact plate 16, upper spring 2 increases with lower spring 4 decrements, and pressure increase subsequently also passes to the initial pressure-pad-force that plate 16 is exactly a pressure variable edge force control curve.And plane and intermediate plate 1 just collide on this moment pressure variable edge force bar 8, as shown in Figure 5.Pull and stretch begins, and the power of punch 6 pressing plate material passes on the die cushion block 12, and die cushion block 12 is down motion just, on die cushion block 12 large end faces untie-sell 15 is arranged, and untie-sell 15 is inserted in the chute of cantilever arm of pressure variable edge force cam 11.Untie-sell 15 was toward the cantilever arm of drop-down pressure variable edge force cam 11 when die cushion block 12 down moved, thereby can make pressure variable edge force cam 11 around bearing pin 10 rotations, pressure variable edge force cam 11 is by the end points of top pressure variable edge force bar 8 big ends, pressure variable edge force bar 8 passes just top intermediate plate 1 up of holding pad 5 holes, the height of lower spring 4 is increased or reduce, thereby the pressure of blank holder pressing plate material 16 is reduced or increase.Reached and adopted pressure variable edge force control in the drawing process.Change pressure variable edge force cam face curve, can finish any pressure-pad-force curve controlled drawing process, as shown in Figure 6.
The concise and to the point specification of cam:
(1) obtain the needed flanging force-time curve of drawing part according to theory calculating or finite element modelling, wherein the time is obtained by the operating rate and the drawing part pull and stretch height of forcing press;
(2) select suitable spring, flanging force-time curve conversion calculations is gone out the spring force-time curve,, be converted into spring and be compressed back height-time graph according to the spring force-time curve;
(3) according to designed structure, obtain beginning the angle that the pressure variable edge force cam turns over when pull and stretch finishes from pull and stretch, the time that pressure-pad-force changes is to equate with the time that the pressure variable edge force cam turns over;
(4) be compressed back height-time graph according to spring, will divide some equal portions the time, the corresponding rear spring height that is compressed is all arranged on each short time unit;
(5) on the circumference of the basic circle of pressure variable edge force cam, the rotation direction of pressing the pressure variable edge force cam is divided some equal portions, and the umber that waits that waits umber and pull and stretch time to divide equates.Method for designing according to cam, according to the locus of mould and the correlation of each part, during design, assurance pressure variable edge force cam revolution is crossed a minute angle, the compressive force that compression height produced of lower spring just equals the pressure-pad-force of required correspondence this moment, so, can obtain continually varying pressure variable edge force cam face curve.
To solve following problem in concrete the enforcement:
1, obtains the needed flanging force-time curve of drawing part according to theory calculating or finite element modelling, select spring, determine initial pressure, go out the spring force-time curve according to flanging force-time curve Conversion Calculation, according to the spring force-time curve, be converted into spring height-time graph, in this time, calculate the angle that the pressure variable edge force cam turns over, get the corner equal portions identical with the time, obtain the curve of pressure variable edge force cam face variation and design pressure variable edge force bar long and chute and pressure variable edge force pole length, determine the untie-sell position.
2, when the pull and stretch cylindrical part, under the pull and stretch situation when only arranging three pressure variable edge force bars, the pressure variable edge force bar can be used as the drawing part locating element simultaneously.
3, simple drawing part of pull and stretch such as cylindrical part are as described above.
4, pull and stretch changes arbitrarily and the drawing part such as the automobile panel of complicated shape, on stamping parts flange diverse location, is the center with the pressure variable edge force bar, uniform compressing member, perhaps the pinnacle below the pressure variable edge force bar is the center, and up knock-pin adopts 4 shape, uniform again compressing member.So mechanisms such as pressure variable edge force cam, pressure variable edge force bar are installed respectively, just can apply different time dependent pressure-pad-forces, can realize dissimilar pressure-pad-force control curve controlled drawing processes in the different flange position of drawing part,
The above-mentioned specific embodiment is used for the present invention that explains, rather than limits the invention, and in the protection domain of spirit of the present invention and claim, any modification and change to the present invention makes all fall into protection scope of the present invention.

Claims (3)

1. based on the cupping tool of pressure variable edge force control, it is characterized in that comprising mould assembly and lower mould assembly, wherein:
1) goes up mould assembly: comprise intermediate plate (1), upper spring (2), material returned screw (3), lower spring (4), holding pad (5), punch (6), guide pin bushing (20) and cope match-plate pattern (21); The punch (6) of leaving pore is equipped with at cope match-plate pattern (21) center, lower surface, punch (6) is sleeved in intermediate plate (1) hole and holding pad (5) hole from top to bottom successively, and form with intermediate plate (1) hole and holding pad (5) hole and to be slidingly matched, have the through hole more than three on the cope match-plate pattern (21) of punch (6) outside, material returned screw (3) all is housed in each through hole, expose on the material returned screw (3) of cope match-plate pattern (21) lower surface and be sleeved on upper spring (2) successively, in intermediate plate (1) and lower spring (4) hole, material returned screw (3) end is threaded with holding pad (5), have the through hole more than three on the holding pad (5) outside the material returned screw (3), guide pin bushing (20) is equipped with in cope match-plate pattern (21) lower end of intermediate plate (1) and holding pad (5) outside;
2) lower mould assembly: comprise die (7), pressure variable edge force bar (8), motion spring (9), bearing pin (10), pressure variable edge force cam (11), die cushion block (12), head part spring (13), spacing collar (14), untie-sell (15), alignment pin (17), lower bolster (18) and guide pillar (19); In the spacing collar (14) at lower bolster (18) center, upper surface head part spring (13) is housed, on lower bolster (18) upper surface of spacing collar (14) outside " ∏ " shape die (7) is housed, die cushion block (12) is equipped with at " ∏ " shape die (7) center, upper surface, the small end of die cushion block (12) forms with " H " shape die (7) and is slidingly matched, head part spring (13) withstands on die cushion block (12) large end face, die cushion block (12) center line and punch (6) central lines, " ∏ " shape die (7) upper surface of die cushion block (12) outside has the through hole more than three, pressure variable edge force bar (8) is housed respectively in each through hole, the small end of pressure variable edge force bar (8) stretches out the outer end of " ∏ " shape die (7) can be corresponding one by one with the hole on the holding pad (5), form respectively and be slidingly matched, the small end of pressure variable edge force bar (8) in " ∏ " shape die (7) is sleeved in motion spring (9) hole, pressure variable edge force cam (11) more than three withstands on the end points of the big end of pressure variable edge force bar (8) separately respectively, pressure variable edge force cam (11) rotates around bearing pin (10), the cantilever arm of pressure variable edge force cam (11) is connected with untie-sell (15) with the big end of die cushion block (12), " ∏ " shape die (7)) guide pillar (19) with guide pin bushing (20) corresponding number of cope match-plate pattern (21) is housed on the Wai lower bolster (18), during work, guide pillar (19) can insert to form in separately the dowel hole and be slidingly matched, simultaneously, the alignment pin (17) on " ∏ " shape die (7) inserts in holding pad (5) locating hole and locatees.
2. the cupping tool based on pressure variable edge force control according to claim 1, it is characterized in that: described pressure variable edge force cam (11), when the drawing part of pull and stretch rule flange shape, the i.e. drawing part of the flange shape of representing with a parameter, the pattern curve of pressure variable edge force cam (11) is identical and with Mould's Pressure Center symmetric arrangement or mould geometric center symmetric arrangement.
3. the cupping tool based on pressure variable edge force control according to claim 1, it is characterized in that: described pressure variable edge force cam (11), during the drawing part of the irregular flange shape of pull and stretch, the i.e. drawing part of the flange shape that can not represent with a parameter, the pattern curve of pressure variable edge force cam (11) has nothing in common with each other, and different flange shaped positions place arranges the pressure variable edge force cam (11) of difformity curve.
CNB2007100705040A 2007-08-16 2007-08-16 Drawing die based on variable blank holderforce control Expired - Fee Related CN100443211C (en)

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CN102366796A (en) * 2011-10-28 2012-03-07 奇瑞汽车股份有限公司 Limit returning and guiding integral structure
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CN103025449A (en) * 2010-07-21 2013-04-03 马自达汽车株式会社 Method for forming steel plate by hot press
US9321092B2 (en) 2010-07-21 2016-04-26 Mazda Motor Corporation Method for forming steel sheet by hot pressing
CN102485371A (en) * 2010-12-03 2012-06-06 北汽福田汽车股份有限公司 Stamping mould for forming work piece with local inner concave part
CN102485371B (en) * 2010-12-03 2014-09-17 北汽福田汽车股份有限公司 Stamping mould for forming work piece with local inner concave part
CN102366796A (en) * 2011-10-28 2012-03-07 奇瑞汽车股份有限公司 Limit returning and guiding integral structure
CN102527820A (en) * 2012-01-19 2012-07-04 宁波久腾车灯电器有限公司 Aluminum alloy die casting piece trimming die with smooth cut
CN103372593A (en) * 2012-04-25 2013-10-30 常州市威普电子科技有限公司 Stamping die
CN103372593B (en) * 2012-04-25 2016-02-17 常州市威普电子科技有限公司 Diel
CN103480715A (en) * 2013-09-06 2014-01-01 珠海元盛电子科技股份有限公司 Pre-pressed pipe position forming die
CN103480715B (en) * 2013-09-06 2015-07-22 珠海元盛电子科技股份有限公司 Pre-pressed pipe position forming die
CN103464596A (en) * 2013-09-13 2013-12-25 天津大田包装容器有限公司 Device for directly stretching finger-gland mouthpiece seat on tank cover
CN103722086B (en) * 2013-12-20 2016-06-22 江苏大学 The micro-cupping tool of multiple dimensioned precision that ultra thin plate shapes can be detected in real time
CN103722086A (en) * 2013-12-20 2014-04-16 江苏大学 Multi-scale precision micro deep drawing die allowing real-time forming detection of ultrathin plates
CN104289592A (en) * 2014-09-29 2015-01-21 佛山市康思达液压机械有限公司 Aluminum alloy drawing and extruding compound technology
CN105081175A (en) * 2015-07-16 2015-11-25 重庆大江杰信锻造有限公司 Novel guide column and guide sleeve structure of crankshaft forging die
CN105251874A (en) * 2015-10-20 2016-01-20 中国电子科技集团公司第四十八研究所 Deep-drawing die for preparing titanium alloy deep-small-opening cup-shaped barrel
CN106623622A (en) * 2017-02-20 2017-05-10 国泰消防科技股份有限公司 Forming die for fire-fighting box alarming button bracket
CN108687236A (en) * 2018-05-03 2018-10-23 河源市英广硬质合金有限公司 A kind of hard alloy cross-shaped glass drill grinding tool being exclusively used in marble tile drilling

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