CN101018626B - Pressing forming device and pressing forming method for metal plate - Google Patents

Abstract

A press forming device and method in which press formation limit can be enhanced as compared with conventional warm pressings without causing any breakage. Especially, when a metal plate is drawn into a shape having two, three or more crests, the press formation limit can be enhanced as compared with conventional warm pressings without causing any breakage. Specifically, the metal plate press forming device (200) having a punch (3), a die (2) and a blank holder (4) comprises a means (101) for heating at least one of the contact part (Pd) of the die (2) and the metal plate (1) and the contact part (Pb) of the blank holder (4) and the metal plate (1), means (101, 51) for heating at least one of the contact part (Ph) of the top (35) of the punch (3) and the metal plate (1) and the back side (Phb) of the contact part of the top (35) of the punch (3) and the metal plate (1), and preferably a means for cooling at least one of the contact part (Pcp) of the corner R portion of the punch and the metal plate (1) and the contact part (Pcd) of the corner R portion of the die and the metal plate (1).

Description

The press molding equipment of metallic plate and press-processing method

Technical field

Press molding equipment and press-processing method when the present invention relates to use the parts of metallic plate drawing automobile, furniture, household electrical appliances etc.

Background technology

In the past, during as the drawing metallic plate, raising can not produce fracture and carry out the method for the limit of drawing, is known in the press-processing method of the metallic plate that utilizes warm forging of Japanese kokai publication sho 50-137861 communique and Japanese kokai publication hei 11-309518 communique record.Relevant this method describes with reference to Fig. 6.The 1st, metallic plate, the 2nd, punch die, the 3rd, drift, the 4th, blank holder (blank holder) (being also referred to as anchor clamps or clip).Be provided with electric heater 11,12 in the inside of punch die 2 and blank holder 4, formed the structure that adds hot die 2 and blank holder 4.On the other hand, be provided with the water channel (coolant pat) of circulation cooling water (coolant) 13 in the inside of drift 3, form the structure that drift 3 is cooled.

The principle of relevant this method describes with reference to Fig. 7.When being cylindric with flat metallic plate deep hole pinching, the distortion of the metallic plate 1 in the deep hole pinching significantly produces at edge part 201.Edge part 201 is become side wall portion 203 by deep hole pinching, and produces sex change hardly at side wall portion 203, just transmits the tension force that is used to introduce follow-up edge part.

Can judge that according to these principles the possible condition of deep hole pinching is, in Fig. 7, the fracture strength of side wall portion 203 parts of metallic plate 1 is greater than the deep-draw resistance of edge part 201.But the dark parts of the deep-draw degree of depth need to strengthen the area of edge part 201 more, and therefore, the deep-draw resistance increases.On the other hand, the break limit stress of side wall portion 203 does not change, so the dark parts of the deep-draw degree of depth are difficult to be shaped.

At this moment, usually metal has and heats then deliquescing (low hot strength than), cools off the character of then hardening (high tensile than).Therefore, reduce deformation drag (hot strength TS) at the edge part 201 that heats Fig. 7, and cool off and finished the side wall portion 203 that is shaped and improved fracture strength (hot strength TS), then can increase substantially the limit that can not produce fracture and carry out drawing.

But, as the press-processing method of the metallic plate that utilizes warm forging of Japanese kokai publication sho 50-137861 communique and Japanese kokai publication hei 11-309518 communique record, be not under any circumstance can both fully improve not produce fracture and the limit of drawing.For example, especially deep hole pinching or stretch forming are have that Fig. 8 A represents bimodal or three peaks that Fig. 8 B represents or the situation of its above shape.

Summary of the invention

The present invention In view of the foregoing, purpose is to provide a kind of press-processing method of metallic plate, compare with the press-processing method of in the past the metallic plate that utilizes warm forging, can further improve the limit that can not produce fracture and carry out drawing, it is when having the shape of bimodal, three peaks or its above multimodal that deep hole pinching especially is provided, compare with warm forging in the past, can further improve the press molding equipment and the press-processing method of the metallic plate of the limit that can not produce the fracture and carry out drawing.

That is, the present invention is as follows.

(1) a kind of press molding equipment of metallic plate, has drift, punch die, blank holder, it is characterized in that, has device to described metallic plate additional temp difference, make the temperature T d of contact portion Pd of described punch die and described metallic plate, the temperature T b of the contact portion Pb of described blank holder and described metallic plate, the temperature T hb of the rear side Phb of the contact portion of the temperature T h of the top of described drift and the contact portion Ph of described metallic plate or the top of described drift and described metallic plate is higher than the temperature T cd of the contact portion Pcd of the angle R portion of the temperature T cp of contact portion Pcp of the angle R portion of drift and described metallic plate and punch die and described metallic plate.

(2) according to the press molding equipment of (1) described metallic plate, have: the heater that heats at least one part among the contact portion Pb of the contact portion Pd of described punch die and described metallic plate and described blank holder and described metallic plate; And the heater that heats at least one part among the rear side Phb of contact portion of the top of the contact portion Ph of the top of described drift and described metallic plate and described drift and described metallic plate.

(3), has the cooling device of the contact portion Pcp of the angle R portion of the described drift of cooling and described metallic plate according to the press molding equipment of (1) or (2) described metallic plate.

(4), has the cooling device of the contact portion Pcd of the angle R portion of the described punch die of cooling and described metallic plate according to the press molding equipment of (1) or (2) described metallic plate.

(5), has the cooling device of the contact portion Pcd of the angle R portion of the contact portion Pcp of the angle R portion of the described drift of cooling and described metallic plate and described punch die and described metallic plate according to the press molding equipment of (1) or (2) described metallic plate.

(6) a kind of press molding equipment of metallic plate, have drift, punch die, blank holder, it is characterized in that having: the heater that heats at least one part among the contact portion Pb of the contact portion Pd of described punch die and described metallic plate and described blank holder and described metallic plate; And the heater that heats the contact portion Ph of the top of described drift and described metallic plate.

(7) a kind of press molding equipment of metallic plate, have drift, punch die, blank holder, it is characterized in that having: the heater that heats at least one part among the contact portion Pb of the contact portion Pd of described punch die and described metallic plate and described blank holder and described metallic plate; And the heater of rear side Phb that heats the contact portion of the top of described drift and described metallic plate.

(8) a kind of press molding equipment of metallic plate, have drift, punch die, blank holder, it is characterized in that having: the heater that heats at least one part among the contact portion Pb of the contact portion Pd of described punch die and described metallic plate and described blank holder and described metallic plate; Heat the heater of the contact portion Ph of the top of described drift and described metallic plate; And the heater of rear side Phb that heats the contact portion of the top of described drift and described metallic plate.

(9) according to the press molding equipment of each described metallic plate in (6) to (8), it is characterized in that having the cooling device of the contact portion Pcp of the angle R portion of the described drift of cooling and described metallic plate.

(10) according to the press molding equipment of each described metallic plate in (6) to (8), it is characterized in that having the cooling device of the contact portion Pcd of the angle R portion of the described punch die of cooling and described metallic plate.

(11) press molding equipment of each described metallic plate in the basis (6) to (8), it is characterized in that having the cooling device of the contact portion Pcd of the angle R portion of the contact portion Pcp of cooling angle R portion of described drift and described metallic plate and described punch die and described metallic plate.

(12) a kind of press-processing method of metallic plate, has drift in use, punch die, when the metallic plate press molding equipment of blank holder carries out the drawing of metallic plate, carry out drawing in the time of to described metallic plate additional temp difference, make the temperature T d of contact portion Pd of described punch die and described metallic plate, the temperature T b of the contact portion Pb of described blank holder and described metallic plate, the temperature T hb of the rear side Phb of the contact portion of the temperature T h of the top of described drift and the contact portion Ph of described metallic plate or the top of described drift and described metallic plate is higher than the temperature T cd of the contact portion Pcd of the angle R portion of the temperature T cp of contact portion Pcp of the angle R portion of drift and described metallic plate and punch die and described metallic plate.

(13) press-processing method of basis (12) described metallic plate, at least one part in the contact portion Pb of the contact portion Pd that heats described punch die and described metallic plate and described blank holder and described metallic plate, and when heating at least one part among the rear side Phb of contact portion of the top of the contact portion Ph of the top of described drift and described metallic plate and described drift and described metallic plate, carry out drawing.

(14) according to the press-processing method of (12) or (13) described metallic plate, in the contact portion Pcp of angle R portion of cooling off described drift and described metallic plate, carry out drawing.

(15) according to the press-processing method of (12) or (13) described metallic plate, in the contact portion Pcd of angle R portion of cooling off described punch die and described metallic plate, carry out drawing.

(16), in the contact portion Pcd of the angle R portion of the contact portion Pcp of the angle R portion of the described drift of cooling and described metallic plate and described punch die and described metallic plate, carry out drawing according to the press-processing method of (12) or (13) described metallic plate.

(17) a kind of press-processing method of metallic plate, when the metallic plate press molding equipment that has drift, punch die, a blank holder in use carries out the drawing of metallic plate, at least one part in the contact portion Pb of the contact portion Pd that heats described punch die and described metallic plate or described blank holder and described metallic plate, and the contact portion Ph of the top of described drift and described metallic plate the time, carry out drawing.

(18) a kind of press-processing method of metallic plate, when the metallic plate press molding equipment that has drift, punch die, a blank holder in use carries out the drawing of metallic plate, at least one part in the contact portion Pb of the contact portion Pd that heats described punch die and described metallic plate or described blank holder and described metallic plate, and the rear side Phb of the contact portion of the top of described drift and described metallic plate the time, carry out drawing.

(19) a kind of press-processing method of metallic plate, when the metallic plate press molding equipment that has drift, punch die, a blank holder in use carries out the drawing of metallic plate, at least one part in the contact portion Pb of the contact portion Pd that heats described punch die and described metallic plate or described blank holder and described metallic plate, and at least one part among the rear side Phb of the contact portion of the top of the contact portion Ph of the top of described drift and described metallic plate and described drift and described metallic plate the time, carry out drawing.

(20) according to the press-processing method of each described metallic plate in (17) to (19), it is characterized in that, in the contact portion Pcp of angle R portion of cooling off described drift and described metallic plate, carry out drawing.

(21) according to the press-processing method of each described metallic plate in (17) to (19), it is characterized in that, in the contact portion Pcd of angle R portion of cooling off described punch die and described metallic plate, carry out drawing.

(22) press-processing method of each described metallic plate in the basis (17) to (19), it is characterized in that, in the contact portion Pcd of the angle R portion of the contact portion Pcp of cooling angle R portion of described drift and described metallic plate and described punch die and described metallic plate, carry out drawing.

(23) a kind of press-processing method of metallic plate, when the metallic plate press molding equipment that has drift, punch die, a blank holder in use carries out the drawing of metallic plate, in advance described metallic plate is heated, and at least one part in the contact portion Pcd of the angle R portion of the contact portion Pcp of cooling angle R portion of described drift and described metallic plate and described punch die and described metallic plate, carry out drawing.

(24) a kind of press-processing method of metallic plate, when the metallic plate press molding equipment that has drift, punch die, a blank holder in use carries out the drawing of metallic plate, in advance described metallic plate is heated, and in the contact portion Pcp of angle R portion of cooling off described drift and described metallic plate, carry out drawing.

(25) a kind of press-processing method of metallic plate, when the metallic plate press molding equipment that has drift, punch die, a blank holder in use carries out the drawing of metallic plate, in advance described metallic plate is heated, and in the contact portion Pcd of angle R portion of cooling off described punch die and described metallic plate, carry out drawing.

(26) a kind of press-processing method of metallic plate, when the metallic plate press molding equipment that has drift, punch die, a blank holder in use carries out the drawing of metallic plate, in advance described metallic plate is heated, and in the contact portion Pcd of the angle R portion of the contact portion Pcp of cooling angle R portion of described drift and described metallic plate and described punch die and described metallic plate, carry out drawing.

(27) a kind of press-processing method of metallic plate, has drift in use, punch die, when the metallic plate press molding equipment of blank holder carries out the drawing of metallic plate, at least one part in the contact portion Pb of the contact portion Pd that heats described punch die and described metallic plate or described blank holder and described metallic plate, heat at least one part among the rear side Phb of contact portion of the top of the contact portion Ph of the top of described drift and described metallic plate or described drift and described metallic plate, and make the contact portion Pcd of the angle R portion of the contact portion Pcp of the angle R portion of described drift and described metallic plate and described punch die and described metallic plate the temperature remains within the normal range or cooling the time, carry out drawing, meanwhile, confirm that the crackle that adds man-hour produces the position, if crackle appears at top and the contact portion Ph of described metallic plate and the part that its rear side Phb is clamped of described drift, then reduce at least one among the heating-up temperature Thb of rear side Phb of contact portion of the top of the heating-up temperature Th of contact portion Ph of the top of described drift and described metallic plate or described drift and described metallic plate, and/or the chilling temperature Tcp of the contact portion Pcp of the angle R portion of the described drift that raises and described metallic plate, if crackle appears at the angle R portion of described drift and the contact portion Pcp of described metallic plate, among the heating-up temperature Thb of rear side Phb of contact portion of the top of the heating-up temperature Th of contact portion Ph of the top of described drift and described metallic plate or described drift and described metallic plate at least one then raises, and/or reduce the chilling temperature Tcp of the contact portion Pcp of the angle R portion of described drift and described metallic plate, repeat drawing once more, find out the temperature difference that makes manufacturing limit the highest thus.

(28) a kind of press-processing method of metallic plate, has drift in use, punch die, when the metallic plate press molding equipment of blank holder carries out the drawing of metallic plate, at least one part in the contact portion Pb of the contact portion Pd that heats described punch die and described metallic plate or described blank holder and described metallic plate, heat at least one part among the rear side Phb of contact portion of the top of the contact portion Ph of the top of described drift and described metallic plate or described drift and described metallic plate, and make the contact portion Pcd of the angle R portion of the contact portion Pcp of the angle R portion of described drift and described metallic plate and described punch die and described metallic plate the temperature remains within the normal range or cooling the time, carry out drawing, meanwhile, confirm that the crackle that adds man-hour produces the position, if crackle appears at the angle R portion of described punch die and the contact portion Pcd of described metallic plate, then reduce the chilling temperature Tcd of the contact portion Pcd of the angle R portion of punch die and described metallic plate, and/or among the heating-up temperature Tb of the contact portion Pb of the heating-up temperature Td of the contact portion Pd of raise described punch die and described metallic plate or described blank holder and described metallic plate at least one, if crackle appears at the part that contact portion Pb clamped of contact portion Pd or the described blank holder and the described metallic plate of described punch die and described metallic plate, then reduce at least one among the heating-up temperature Tb of contact portion Pb of the heating-up temperature Td of contact portion Pd of described punch die and described metallic plate or described blank holder and described metallic plate, and/or the chilling temperature Tcd of the contact portion Pcd of the angle R portion of the described punch die that raises and described metallic plate, repeat drawing once more, find out the temperature difference that makes manufacturing limit the highest thus.

(29) press-processing method of basis (12) described metallic plate, after the drawing, confirm that the crackle that adds man-hour produces the position, if crackle appears at top and the contact portion Ph of described metallic plate and the part that its rear side Phb is clamped of described drift, then reduce at least one among the heating-up temperature Thb of rear side Phb of contact portion of the top of the heating-up temperature Th of contact portion Ph of the top of described drift and described metallic plate or described drift and described metallic plate, and/or the chilling temperature Tcp of the contact portion Pcp of the angle R portion of the described drift that raises and described metallic plate, repeat drawing once more, find out the temperature difference that makes manufacturing limit the highest thus.

(30) press-processing method of basis (12) described metallic plate, after the drawing, confirm that the crackle that adds man-hour produces the position, if crackle appears at the angle R portion of described drift and the contact portion Pcp of described metallic plate, among the heating-up temperature Thb of rear side Phb of contact portion of the top of the heating-up temperature Th of contact portion Ph of the top of described drift and described metallic plate or described drift and described metallic plate at least one then raises, and/or reduce the chilling temperature Tcp of the contact portion Pcp of the angle R portion of described drift and described metallic plate, repeat drawing once more, find out the temperature difference that makes manufacturing limit the highest thus.

(31) press-processing method of basis (12) described metallic plate, after the drawing, confirm that the crackle that adds man-hour produces the position, if crackle appears at the angle R portion of described punch die and the contact portion Pcd of described metallic plate, then reduce the chilling temperature Tcd of the contact portion Pcd of described punch die and described metallic plate, and/or among the heating-up temperature Tb of the contact portion Pb of the heating-up temperature Td of the contact portion Pd of raise described punch die and described metallic plate or described blank holder and described metallic plate at least one, repeat drawing once more, find out the temperature difference that makes manufacturing limit the highest thus.

(32) press-processing method of basis (12) described metallic plate, after the drawing, confirm that the crackle that adds man-hour produces the position, if crackle appears at the part that contact portion Pb clamped of contact portion Pd or the described blank holder and the described metallic plate of described punch die and described metallic plate, then reduce at least one among the heating-up temperature Tb of contact portion Pb of the heating-up temperature Td of contact portion Pd of described punch die and described metallic plate or described blank holder and described metallic plate, and/or the chilling temperature Tcd of the contact portion Pcd of the angle R portion of the described punch die that raises and described metallic plate, repeat drawing once more, find out the temperature difference that makes manufacturing limit the highest thus.

According to the present invention, compare with warm forging in the past, can further improve not produce and rupture and the limit of drawing.Particularly, a kind of press molding equipment and press-processing method of metallic plate can be provided, when deep hole pinching has the shape of bimodal or three peaks shown in Fig. 8 A and Fig. 8 B or the multimodal more than it, compare with warm forging in the past, can further improve not produce and rupture and the limit of drawing.

Description of drawings

Fig. 1 is the figure that is used to illustrate one embodiment of the present invention.

Fig. 2 is the figure (A-A of Fig. 1 is to view) that is used to illustrate one embodiment of the present invention.

Fig. 3 is the figure (B-B of Fig. 1 is to view) that is used to illustrate one embodiment of the present invention.

Fig. 4 A is the figure that is used to illustrate one embodiment of the present invention

Fig. 4 B is the enlarged drawing of Fig. 4 A.

Fig. 5 A is the figure that is used to illustrate embodiments of the invention 1～4.

Fig. 5 B is the figure that is used to illustrate embodiments of the invention 1～4.

Fig. 5 C is the figure that is used to illustrate embodiments of the invention 5.

Fig. 5 D is the figure that is used to illustrate embodiments of the invention 5.

Fig. 6 is the figure that is used to illustrate prior art.

Fig. 7 is the figure that is used to illustrate prior art.

Fig. 8 A is used to illustrate the figure that needs particularly suitable shape of the present invention.

Fig. 8 B is used to illustrate the figure that needs particularly suitable shape of the present invention.

Fig. 9 is the enlarged drawing that is used to illustrate Fig. 4 A of heating location of the present invention and cool position.

Label declaration

1: metallic plate, 2: punch die, 3: drift, 4: blank holder, 11,12: electric heater, 13: cooling fluid, 21: die body, 22: the punch die heating plate, 23: punch die angle R portion coldplate, 24,33: cooling fluid path, 25: heat-barrier material, 26: the angle R portion of punch die, 29: upper plate, 31: punch body, 32: the drift coldplate, 34: the gap, 39: lower plate, 41: the blank holder main body, 42: the blank holder heating plate, 43: cushion pins, 44: pilot pin, 51: heating cushion, 52: pillar, 53: spring, 101: electric heater, 201: edge part, 202～204: side wall portion (outside), 205: side wall portion (inboard), 206: edge part (between peak and the peak), Pd: the contact portion of punch die and metallic plate, Td: the heating-up temperature of the contact portion of punch die and metallic plate, Pb: the contact portion of blank holder and metallic plate, Tb: the heating-up temperature of the contact portion of blank holder and metallic plate, 207, Pcp: the angle R portion of drift and the contact portion of metallic plate, Tcp: the heating-up temperature of the angle R portion of drift and the contact portion of metallic plate, 208, Pcd: the angle R portion of punch die and the contact portion of metallic plate, Tcd: the heating-up temperature of the angle R portion of punch die and the contact portion of metallic plate, 210, Ph: the top of drift and the contact portion of metallic plate, Th: the heating-up temperature of the top of drift and the contact portion of metallic plate, 210, Phb: the rear side of the top of drift and the contact portion of metallic plate, Thb: the heating-up temperature of the contact portion of the rear side of the top of drift and the contact portion of metallic plate.

The specific embodiment

According to the inventor's research, clear and definite following content.According to the press-processing method of in the past the metallic plate that utilizes warm forging, that is, heating edge part 201 shown in Fig. 8 A, the method for cooling side wall portion 202～204 can not produce fracture and the limit of drawing has certain effect for improving.

But, even add thermal spike and peak-to-peak edge part 206, cooling side wall portion 202 etc., formability also can descend on the contrary.Its reason is, peak and peak-to-peak edge part 206 are not deep hole pinchings, but is extended and is shaped.That is to say, between peak and peak, constitute the side wall portion 203 at two peaks and 205 position and consume metallic plate, but from around do not have the inflow of metallic plate.Therefore, peak and peak-to-peak metallic plate are extended.If metallic plate is heated under such situation, then extends and further to strengthen.Common metal as iron and steel, deliquescing during heating (low hot strengthization), but ductility does not improve.Therefore, fracture easily.

Thereby at deep hole pinching is when having the shape at bimodal or three peaks shown in Fig. 8 A and Fig. 8 B, the manufacturing process of the metallic plate that utilizes warm forging in the past, and its effect is also insufficient.This situation in the multimodal more than three also is identical.That is, because peak and peak-to-peak edge part 206 only with the ductility distortion of this part, become so-called stretch process (stretch forming) not from the inflow of metallic plate on every side, therefore, and warm forging in the past, its effect is also insufficient.

Below, utilize Fig. 1 to Fig. 5, an embodiment of the invention are described.At this, Fig. 2 is the A-A diagram of Fig. 1, and Fig. 3 is the B-B diagram of Fig. 1.

The 1st, metallic plate.Clamp this metallic plate, have punch die 2 at upside, it is made of die body 21, punch die heating plate 22, punch die angle R portion coldplate 23 and upper plate 29.Upper plate 29 is fixed on the not shown lift of press molding equipment 200 by not shown part.

On the other hand, have drift 3 in the bottom of metallic plate 1, it is made of punch body 31, drift coldplate 32, lower plate 39 etc.Lower plate 39 is fixed on the base portion of press molding equipment 200 by not shown part.

Equally, have blank holder 4 in the bottom of metallic plate 1, it is made of blank holder main body 41 and blank holder heating plate 42, and blank holder main body 41 from supported underneath with certain power by not shown pressure apparatus by a plurality of cushion pins 43.The 44th, pilot pin.

The effect of the press molding equipment 200 of metallic plate of the present invention then is described.When drawing, shown in Fig. 4 A, utilize the decline of the not shown lift of press molding equipment 200, punch die 2 descends, because be prescribed during drift 3, so metallic plate 1 is out of shape as shown in the figure.At this moment, blank holder 4 can from below supported and descend with certain power, so metallic plate 1 is sandwiched between punch die 2 and the blank holder 4, be so-called die surface (die face), thereby suppressed the generation of fold.

At this moment, shown in Fig. 4 B and Fig. 9 amplification, form on the metallic plate 1 respectively with the angle R portion 36 of drift, the top of drift (below, will be except the part the angle R portion of drift, so be called for short) 35, the part (being called Pcp, Ph, Pcd) of angle R portion 26 contacts of punch die is (in Fig. 8, be labeled as 207,210,208 respectively, below use same tag) and side wall portion 203 (perhaps 202,204,205), edge part (Pd or be also referred to as Pb) (below, will except with part that the angle R portion of punch die contacts part, so be called for short) 201.

At this, in the press molding equipment 200 of the metallic plate of present embodiment, as shown in Figure 1, on punch die heating plate 22, imbed the electric heater 101 that is provided with as heater.And then, on blank holder heating plate 42, also imbed the electric heater 101 that is provided with as heater.Utilize the part (edge part 201) (Pd or be also referred to as Pb) of the metallic plate 1 of these heating in the so-called die surface portion between punch die 2 and the blank holder 4.In addition, on the press molding equipment 200 of the metallic plate of present embodiment, have as the heating cushion 51 (this also is a kind of of heating plate) of imbedding the heater that electric heater 101 is set, as Fig. 4 B and shown in Figure 9, can heat the top 35 of drift and the rear side part Phb of the rear side part of the contact portion of metallic plate 1.Wherein, heating cushion 51 is adjusted to the width of part (Pcp) (207) of the metallic plate 1 of the angle R portion 36 that does not add the thermo-contact drift.

In addition because heating cushion 51 is as long as contact with metallic plate 1, so utilize aforementioned pillar shown in Figure 1 52 can freedom to install up or down with respect to punch die 2, and become utilize spring 53 power by the structure that is pressed on the metallic plate 1.

Like this, in the press molding equipment 200 of the metallic plate of present embodiment, the heater of rear side part Phb with contact portion of the top of contact portion Pb, drift 3 of the contact portion Pd that adds hot die 2 and metallic plate 1, blank holder 4 and metallic plate 1 and metallic plate 1, the top 35 of edge part (201) that can metal heating plate 1 (Pd or be also referred to as Pb) and drift is with the rear side 210 (Phb) of the contact portion of metallic plate 1 time, drawing metallic plate 1.

In the press molding equipment 200 of the metallic plate of present embodiment, though have the heater of top 35 and the rear side part Phb of the contact portion of metallic plate 1 of contact portion Pb, the drift of the contact portion Pd that adds hot die 2 and metallic plate 1, blank holder 4 and metallic plate 1, but any omits in the above two (Pd or Pb), can improve can not produce fracture and the limit of drawing.

In addition, in the press molding equipment 200 of the metallic plate of present embodiment,, be provided with the heating cushion 51 different with drift 3 in relative with drift 3, punch die 2 one sides, but also can be on drift 3 built-in heater.Perhaps, in relative with drift 3, punch die 2 one sides, when being provided with the heating cushion different 51 with drift 3 on drift 3 built-in heater.

In the present invention of (6), press molding equipment with metallic plate of drift, punch die, blank holder, have: heat at least one part among the contact portion Pb of the contact portion Pd of described punch die and described metallic plate and described blank holder and described metallic plate, and the heater of the contact portion Ph of the top of described drift and described metallic plate.In the present invention of (7), press molding equipment with metallic plate of drift, punch die, blank holder, have: heat at least one part among the contact portion Pb of the contact portion Pd of described punch die and described metallic plate and described blank holder and described metallic plate, and the heater of the rear side Phb of the contact portion of the top of described drift and described metallic plate.In the present invention of (8), press molding equipment with metallic plate of drift, punch die, blank holder, have: heat at least one part among the contact portion Pb of the contact portion Pd of described punch die and described metallic plate and described blank holder and described metallic plate, the top of described drift and the contact portion Ph of described metallic plate, and the heater of the rear side Phb of the contact portion of the top of described drift and described metallic plate.

Then, in the present embodiment, as Fig. 1 and Fig. 4 B and shown in Figure 9, on drift 3, has drift coldplate 32, and then, on drift coldplate 32, have cooling fluid path 33, utilize not shown EGR to make liquid circulation, can cool off the angle R portion 36 of drift and the turnover part Pcp of metallic plate thus.That is,, also can have the cooling device of the contact portion Pcp of cooling angle R portion of drift and metallic plate as the present invention of (3), (9).At this, and then, when the contact portion Ph of top 35 of heating drift and metallic plate, can on the top 35 of drift, gap 34 be set, suppress to cool off on the contrary the part of the metallic plate 1 that need heat thus.

Perhaps,, on the punch die coldplate 23 of present embodiment, be provided with cooling fluid path 24, make liquid circulation, can cool off the angle R portion 26 of punch die and the contact portion Pcd of metallic plate thus by not shown EGR as Fig. 1 and Fig. 4 B and shown in Figure 9.That is,, can have the angle R portion 26 of cooling punch die and the cooling device of the contact portion Pcd of metallic plate as the present invention of (4), (10).At this, in the present embodiment,, be purpose with the part Pd that heats the metallic plate 1 that contacts with punch die 2 as Fig. 1 and Fig. 4 B and shown in Figure 9, be provided with punch die heating plate 22, so also be provided with heat-barrier material 25 betwixt.Thus, become the edge part 201 of metal heating plate 1, the structure of the part Pcd (208 shown in Fig. 8 A) of the metallic plate 1 that cooling simultaneously contacts with the angle R portion 26 of punch die.

The present invention as (5), (11), also can satisfy the present invention of (3), (9) and the present invention of (4), (10), promptly, as present embodiment, as Fig. 1, Fig. 4 B and shown in Figure 9, the angle R portion 36 that can have a cooling drift and the angle R portion 26 of the cooling device of the contact portion Pcp of metallic plate and cooling punch die and the cooling device of the contact portion Pcd of metallic plate can further improve thus and prevent the effect that ruptures.

As mentioned above, in the present invention, basically make contact portion (Ph) the 210 relative high temperature that are at the edge part 201 (being also referred to as Pd or Pb) of metallic plate 1 and metallic plate 1 and drift top 35, in addition, make the relative low temperature that is in of part Pcd (208) with the part Pcp (207 shown in Fig. 8 A) of the metallic plate 1 of angle R portion 36 contact of drift and the metallic plate 1 that contacts with the angle R portion 26 of punch die.

Thereby, if before drawing metallic plate 1, heat in advance, then as the present invention of (23), (24), (25), (26), can omit heater, at the contact portion Pcd of the angle R portion 26 of the contact portion Pcp of the angle of drift R portion 36 and metallic plate or punch die and metallic plate or cooling device only is set on both.

In addition, the inventor is by more deep discovering, has in the temperature of above-mentioned heating and cooling or temperature difference that to make forming limit be maximum optimum value, and this is according to the material behavior of the difference of shaping form or metallic plate and difference.

Below, the imposing a condition of heating-up temperature T (Td, Tb, Th, Thb), chilling temperature T (Tcp, Tcd) when drawing of the present invention is described and these temperature difference.

(1) heating-up temperature T (Td, Tb, Th, Thb), chilling temperature T (Tcp, Tcd) and these temperature difference

In the present invention, basically make contact portion (Ph) the 210 relative high temperature that are at the edge part 201 (Pd or be also referred to as Pb) of metallic plate 1 and metallic plate 1 and the top 35 of drift, in addition, the relative low temperature that is in of part Pcd (208) of the metallic plate 1 that makes the part Pcp (207) of the metallic plate 1 that contacts with the angle R portion 36 of drift and contact with the angle R portion 26 of punch die, it is poor to make metallic plate produce hot strength TS thus, thereby can reach purpose of the present invention.The heating-up temperature of Li Yonging, chilling temperature and these temperature difference in the present invention, according to the material behavior of shaping form and metallic plate and different, but as standard roughly, heating-up temperature T during drawing for the first time preferably is made as the temperature above normal temperature so that the hot strength TS under this heating-up temperature T be under the normal temperature hot strength TS 50%～70%.In addition, chilling temperature T during drawing for the first time preferably is made as normal temperature or the following temperature of normal temperature, so that the hot strength TS under this chilling temperature T is identical with hot strength TS under the normal temperature, perhaps become the above hot strength TS of hot strength TS under the normal temperature.That is, preferably under 30%～50% the condition of the hot strength TS of the metallic plate of high-temperature portion and low-temp. portion (comprising normal temperature) difference, carry out drawing for the hot strength TS under the normal temperature.For the second time later drawing when observing the state of crackle, is adjusted into optimum value with heating-up temperature T and chilling temperature T again according to the present invention described later (16) and gets final product.

If heating-up temperature T surpasses 200 ℃, rolling when making as raw-material metallic plate employed lubricant can not give full play to lubricating function, so be made as below 200 ℃.In addition, if chilling temperature less than-20 ℃, then metallic plate can become fragile, so be made as more than-20 ℃.

For heating-up temperature T of the present invention, chilling temperature T and these temperature difference, by drawing these optimum value, in above-mentioned drawing with the outstanding shape more than bimodal, can further improve its manufacturing limit.(27)～(32) the method that the invention provides the optimum value that effectively obtains these.

Promptly, has drift in use, punch die, when the metallic plate press molding equipment of blank holder carries out the drawing of metallic plate, heat on one side at least one part among the contact portion Pb of the contact portion Pd of described punch die and described metallic plate or described blank holder and described metallic plate, heat at least one part of rear side Phb of the contact portion of the top of the contact portion Ph of the top of described drift and described metallic plate or described drift and described metallic plate, and make the contact portion Pcd of the angle R portion of the contact portion Pcp of the angle R portion of described drift and described metallic plate and described punch die and described metallic plate the temperature remains within the normal range or cooling and carry out drawing, confirm to add crackle generation position in man-hour simultaneously, if crackle appears at top and the contact portion Ph of described metallic plate and the part that its rear side Phb is clamped of described drift, then reduce at least one among the heating-up temperature Thb of rear side Phb of contact portion of the top of the heating-up temperature Th of contact portion Ph of the top of described drift and described metallic plate or described drift and described metallic plate, and/or the chilling temperature Tcp of the contact portion Pcp of the angle R portion of the described drift that raises and described metallic plate, repeat drawing once more, find out the forming and machining method of the metallic plate that makes the highest temperature difference of manufacturing limit thus.

In addition, the forming and machining method of metallic plate of the present invention, if crackle appears at the angle R portion of described drift and the contact portion Pcp of described metallic plate, among the heating-up temperature Thb of rear side Phb of contact portion of the top of the heating-up temperature Th of contact portion Ph of the top of described drift and described metallic plate or described drift and described metallic plate at least one then raises, and/or reduce the chilling temperature Tcp of the contact portion Pcp of the angle R portion of described drift and described metallic plate, repeat drawing once more, find out the temperature difference that makes manufacturing limit the highest thus.

In addition, the forming and machining method of metallic plate of the present invention, if crackle appears at the angle R portion of described punch die and the contact portion Pcd of described metallic plate, then reduce the chilling temperature Tcd of the contact portion Pcd of the angle R portion of described punch die and described metallic plate, and/or among the heating-up temperature Tb of the contact portion Pb of the heating-up temperature Td of the contact portion Pd of raise described punch die and described metallic plate or described blank holder and described metallic plate at least one, repeat drawing once more, find out the temperature difference that makes manufacturing limit the highest thus.

In addition, the forming and machining method of metallic plate of the present invention, if crackle appears at the part that contact portion Pb clamped of contact portion Pd or the described blank holder and the described metallic plate of described punch die and described metallic plate, then reduce at least one among the heating-up temperature Tb of contact portion pb of the heating-up temperature Td of contact portion Pd of described punch die and described metallic plate or described blank holder and described metallic plate, and/or the chilling temperature Tcd of the contact portion Pcd of the angle R portion of the described punch die that raises and described metallic plate, repeat drawing once more, find out the temperature difference that makes manufacturing limit the highest thus.

Heater means of the present invention, requirement can be carried out temperature controlled accurately heating means with 1 ℃ of unit.For example; heater as the rear side of the heater of blank holder, punch die, drift and the metallic plate that contacts with drift; can be on blank holder, punch die or drift etc. built-in electric heater, the pipe arrangement of perhaps built-in cyclic steam, warm water or high temperature oil.In addition, can say directly that steam or hot blast blow to metallic plate, perhaps utilize the induction heater metal heating plate.From carrying out temperature controlled accurately viewpoint, can built-inly in these be used to measure the thermocouple of the surface temperature of blank holder, punch die or drift etc.But, heater means of the present invention, unqualified in these, so long as make the hot strength TS of metallic plate become 50%～70% the method for hot strength TS under the normal temperature, can adopt heating means arbitrarily by heating.

Cooling way of the present invention, requirement can accurately be carried out temperature controlled cooling means with 1 ℃ of unit.For example, the cooling device of the angle R portion of drift and the angle R portion of punch die, the preferred built-in circulation cooling pipe arrangement of non freezing solution.From accurately carrying out temperature controlled angle, the thermocouple of the surface temperature of the angle R portion of preferred built-in mensuration drift and the angle R portion of punch die.But cooling device of the present invention is not limited thereto.So long as make the hot strength TS of metallic plate by cooling is method more than the hot strength TS under the normal temperature, then can adopt any means.Wherein, as the cooling non freezing solution, preferred glycols.

In addition, the metallic plate that the present invention can be suitable for is ferrous metal plates such as ferritic stainless steel with excellent formability, martensitic stainless steel, high tension steel, is hot rolled steel plate or cold-rolled steel sheet (state of hot rolling, perhaps cold rolling state), or these annealed material.In addition, also go for the non-ferrous metal plate that titanium etc. is difficult to punching press.In addition, also go for these coated steel sheet or clad steel.

Especially, can be suitable for the chemical composition of ferritic stainless steel with excellent formability of the present invention, preferably contain C:0.0001～0.1wt%, Si:1.0wt% is following, Mn:2.0wt% following, P:0.1wt% is following, Cr:10～50wt%, below the N:0.10wt%, surplus is Fe and unavoidable impurities.In addition, also can contain be selected from that Al:0.3wt% is following, Ni:1.0wt% following, Mo:3.0wt% is following, Ti:1.0wt% is following, Nb:1.0wt% is following, Zr:1.0wt% is following, Cu:1.0wt% is following, W:0.30wt% is following, a kind of or two or more in following of Co:0.001～0.5wt%, B:0.01wt%.

In addition, can be suitable for the chemical composition of martensitic stainless steel of the present invention, preferably contain C:0.001～1.0wt%, Si:1.0wt% is following, Mn:2.0wt% is following, P:0.1wt% is following, Cr:10～19wt%, N:0.001～0.1wt%, and surplus is Fe and unavoidable impurities.In addition, also can contain be selected from that Al:1.5wt% is following, Ti:1.0wt% following, Nb:1.0wt% is following, W:0.3wt% is following, Zr:1.0wt% is following, Ni:3.0wt% is following, Mo:3.0wt% is following, Cu:1.0wt% is following, a kind of or two or more in following of Co:0.001～0.5wt%, B:0.01wt%.

In addition, can be suitable for the chemical composition of high tension steel of the present invention, preferably contain C:0.01～0.3wt%, Si:1.5wt% is following, Mn:4.0wt% is following, P:1.2wt% is following, S:0.04wt% is following, Al:0.1wt% is following, surplus is Fe and unavoidable impurities.In addition, also can contain be selected from that Ti:0.5wt% is following, a kind of or two or more in following of Nb:0.5wt%.

Embodiment 1

Situation with the shaping double-peak shape shown in Fig. 5 A is an object, experimentizes, verifies.When being such shape with metallic plate 1 drawing, the K portion of Fig. 5 A is stretched easily usually, and distortion is concentrated thereupon, cracks.As metallic plate 1, having used a kind of stainless steel is that ferritic stainless steel with excellent formability, SUS430 (JIS G 4305) (contain C:0.03wt%, Si:0.7wt%, Mn:1.0wt%, P:0.04wt%, Cr:17wt%, below the N:0.10wt%, surplus is Fe and unavoidable impurities) the 0.6mm thickness material.Press molding equipment has used and Fig. 1, Fig. 4 A, Fig. 4 B and the identical device of Fig. 9.

At first, do not carry out any heating or cooling and carry out drawing, do not produce fracture this moment and the limit (limit forming height) of the size shown in the h in can Fig. 5 B of drawing is depicted as 20mm (conventional example 1) as table 1 (1) with usual way.

Then, shown in table 1 (2), warm forging edge part 201,206, that existing Japanese kokai publication sho 50-137861 communique or Japanese kokai publication hei 11-309518 communique are put down in writing of carrying out metal heating plate 1 is shaped.That is, in Fig. 1,, utilize the electric heater that is built in these, be heated to be 150 ℃ punch die heating plate 22 and blank holder heating plate 42, thus drawing metallic plate 1.The limit forming height of this moment rises to 21mm, but the amplitude of improving is very little, only can confirm that by adding hot die 2 and blank holder 4, such double-peak shape can not be brought into play effect of sufficient (conventional example 2) for being shaped.

And then, shown in table 1 (3), the edge part 201,206 of metal heating plate 1 not, utilize the built-in heating cushion of electric heater 51, the rear side Phb of the top 35 of drift and the contact portion of metallic plate 1 is heated to be 150 ℃, drawing metallic plate 1, the limit forming height of this moment is 22.5mm.This also only is raising a little, we can say still not obtain effect of sufficient (comparative example).

Therefore, shown in table 1 (4), utilize built-in electric heater, the edge part 201,206 of metallic plate 1 and the top 35 of drift are heated to be 150 ℃, drawing metallic plate 1, the limit forming height of this moment is increased to 27mm (example 1 of the present invention).

Then, improvement example as example 1 of the present invention, shown in table 1 (5), utilize built-in electric heater, the edge part 201,206 of metallic plate 1 and the top 35 of drift are heated to be 150 ℃, make simultaneously in the cooling fluid path 33 of drift coldplate 32 of Fig. 1, Fig. 4 to make the angle R portion 36 of drift be cooled to-20 ℃ with non freezing solution ethylene glycol (ball is apt to the petrochemistry manufacturing) by cooling, drawing metallic plate 1, limit forming height at this moment increases substantially to 31mm (example 2 of the present invention).At this moment, fracture is in K portion shown in Figure 5, but moves to the L portion near the part Pcd of the metallic plate 1 that contacts with the angle R portion of punch die.

In addition, improvement example as example 1 of the present invention, shown in table 2 (6), utilize built-in electric heater, the edge part 201,206 of metallic plate 1 and the top 35 of drift are heated to be 150 ℃, make simultaneously in the cooling fluid path 24 of punch die coldplate 23 of Fig. 1, Fig. 4 to make the angle R portion 26 of punch die be cooled to-20 ℃ with non freezing solution ethylene glycol (ball is apt to the petrochemistry manufacturing) by cooling, drawing metallic plate 1, limit forming height at this moment is 28mm (example 3 of the present invention).

And then, further improvement example as example 1 of the present invention, shown in table 2 (7), utilize built-in electric heater, the edge part 201,206 of metallic plate 1 and the top 35 of drift are heated to be 150 ℃, making simultaneously in the cooling fluid path 24 of punch die coldplate 23 of Fig. 1, Fig. 4 makes the angle R portion 36 of drift and the angle R portion 26 of punch die be cooled to-20 ℃ by cooling with non freezing solution ethylene glycol (ball is apt to the petrochemistry manufacturing), drawing metallic plate 1, the limit forming height of this moment further rises to 33mm (example 4 of the present invention).At this moment, the crackle generating unit is in K portion shown in Fig. 5 A or L portion, and moves to the M portion of jag part.

Then, in the electric furnace of nitrogen atmosphere, metallic plate 1 is heated to be 200 ℃ in advance, do not use heater, only use cooling device, make in the cooling fluid path 33 of drift coldplate 32 to make the angle R portion 36 of drift be cooled to-20 ℃ with non freezing solution ethylene glycol (ball is apt to the petrochemistry manufacturing) by cooling, drawing metallic plate 1, at this moment, shown in table 2 (8), limit forming height is 30mm (example 5 of the present invention).

Then, in the electric furnace of nitrogen atmosphere, metallic plate 1 is heated to be 200 ℃ in advance, do not use heater, only use cooling device, make simultaneously in the cooling fluid path 24 of punch die coldplate 23 to make the angle R portion 26 of punch die be cooled to-20 ℃ with non freezing solution ethylene glycol (ball is apt to the petrochemistry manufacturing) by cooling, drawing metallic plate 1, at this moment, shown in table 2 (9), limit forming height is 28mm (example 6 of the present invention).

Then, in the electric furnace of nitrogen atmosphere, metallic plate 1 is heated to be 200 ℃ in advance, do not use heater, only use cooling device, make simultaneously in the cooling fluid path 33,24 of each coldplate 32,23 to make the angle R portion 36 of drift and the angle R portion 26 of punch die be cooled to-20 ℃ with non freezing solution ethylene glycol (ball is apt to the petrochemistry manufacturing) by cooling, drawing metallic plate 1, at this moment, shown in table 2 (10), limit forming height is 32mm (example 7 of the present invention).

Embodiment 2

Then, in example 4 of the present invention, the result that the heating-up temperature at top 35 of the drift of built-in electric heater is changed is as shown in table 3.The heating-up temperature at the top 35 of drift is 100 ℃ in the table 3 (1), and table 3 (2) is 110 ℃, and table 3 (3) is 120 ℃, and table 3 (4) is 130 ℃, and table 3 (5) is 140 ℃.At this moment, utilize electric heater heating to make the heating-up temperature of the edge part 201,206 of metallic plate 1 keep certain 150 ℃, make in the cooling fluid path 33,24 of each coldplate 32,23 certain-20 ℃ of angle R portion 26 maintenances that make the angle R portion 36 of drift and punch die by cooling with non freezing solution ethylene glycol (ball is apt to the petrochemistry manufacturing).Limit forming height is as shown in table 3, and the heating-up temperature at the top 35 of drift reaches the highest when being 120 ℃, is 39mm.In addition, the crackle generating unit is the K position in Fig. 5 A under the situation of table 3 (1) and (2), under the situation of table 3 (4) and (5) in the M position.Under the situation of the table 3 that limit forming height is the highest (3), it is the centre position of K and M that crackle produces the position.

As mentioned above, consider for the angle of maximum temperature from making limit forming height, crackle is under the situation (table 3 (4), (5)) that contact portion M, Ph with the top of drift produce, the temperature at the top of drift is too high and herein the strength of materials can be not enough, crackle is under the situation that contact portion K, Pcp with the angle R portion of drift produce, the head temperature of drift does not reach sufficient high temperature, with the relative undercapacity that becomes of the strength of materials of the contact portion Pcp of the angle R portion of drift, thereby crack.

At this, the present invention according to (27), confirm that the crackle that adds man-hour produces the position, if appearing at the contact portion Ph at the top of drift, crackle reduces the heating-up temperature Th at the top of drift, if appearing at the contact portion Pcp of the angle R portion of drift, crackle improves the heating-up temperature Th at the top of drift, and by repeating these, explore crack position and the contact portion Ph at the top of drift and and the contact portion Pcp of the angle R portion of drift between the condition of moving, can find out and make manufacturing limit is maximum temperature conditions.

Embodiment 3

(27), the method for the present invention of (28), be applicable to the situation of example of the present invention 1 of the angle R portion of the angle R portion of not cooling off drift and punch die too.Be suitable for the method for the present invention of (27) and explored the optimum value of heating-up temperature at top of the drift of built-in electric heater, at this moment, this optimum value is 130 ℃, and limit forming height is 32mm.

Embodiment 4

Shown in example 4 of the present invention, the edge part 201,206 of metal heating plate 1 and the top 35 of drift, cool off simultaneously in the processing method of angle R portion of drift, an embodiment of the invention as (27), the heating-up temperature that replaces the top of adjustment drift, adjust the chilling temperature of the angle R portion of drift, also can obtain and above-mentioned same effect.At this moment, the temperature of the angle R portion of drift was low excessively when crackle produced in the contact portion with the top of drift, needed to improve chilling temperature, and crackle is the opposite chilling temperature that needs the angle R portion of reduction drift when producing with the contact portion of the angle R portion of drift.

In the condition of example 4 of the present invention, utilizing built-in electric heater to make the heating-up temperature at the top 35 of the edge part 201,206 of metallic plate 1 and drift is 150 ℃, by as the described method of an embodiment of the invention of above-mentioned (27), make in the cooling fluid path 33 of drift coldplate 32 optimum value of chilling temperature of having explored the angle R portion 36 of drift by cooling with non freezing solution ethylene glycol (ball is apt to the petrochemistry manufacturing), at this moment, this optimum value is-10 ℃, and limit forming height is 36mm.

Perhaps, if use this principle, shown in the present as (28), confirm that the crackle that adds man-hour produces the position, if crackle appears at the contact portion Pcd with the angle R portion of punch die, then improve material heating temperature T d or Tb between punch die and the blank holder, and/or the chilling temperature Tcd of the contact portion Pcd of the angle R portion of reduction punch die and metallic plate, in addition, if crackle appears at the part of the metallic plate between punch die and the blank holder, then reduce the heating-up temperature of the metallic plate between punch die and the blank holder, and/or the chilling temperature of the angle R portion of rising punch die, and by repeating these, explore crack position and the contact portion of the angle R portion of punch die and punch die and blank holder between the condition of migration between the part, can find out and make manufacturing limit is maximum temperature conditions.

Embodiment 5

Situation with the unimodal shape of shaping shown in Fig. 5 C is an object, experimentizes.Under the unimodal situation, be configured as simple deep-draw processing, verified that the present invention compares with conventional example whether to show superiority.Press molding equipment has used and Fig. 1, Fig. 4 A, Fig. 4 B and Fig. 9 device much at one.But, do not use heating cushion 51, built-in electric heater at the drift top.

At first, do not carry out any heating or cooling and carry out drawing, do not produce fracture this moment and the limit (limit forming height) of the size shown in the h in can Fig. 5 D of drawing is depicted as 95mm (conventional example 1) as table 4 (1) with usual way.

Then, shown in table 4 (2), warm forging edge part 201, that existing Japanese kokai publication sho 50-137861 communique or Japanese kokai publication hei 11-309518 communique are put down in writing of carrying out metal heating plate 1 is shaped.That is,, utilize the electric heater that is built in these to be heated to be 150 ℃ with punch die 2 and blank holder 4, thus drawing metallic plate 1.The limit forming height of this moment rises to 21mm (conventional example 2).

And then shown in table 4 (3), the edge part 201 of metal heating plate 1 does not utilize built-in electric heater that the top 35 of drift is heated to be 150 ℃, drawing metallic plate 1, and the limit forming height of this moment is 100mm (comparative example).

Shown in table 4 (4), utilize built-in electric heater, the edge part 201 of metallic plate 1 and the top 35 of drift are heated to be 150 ℃, drawing metallic plate 1, the limit forming height of this moment is increased to 155mm (example 1 of the present invention).

Then, improvement example as example 1 of the present invention, shown in table 4 (5), utilize built-in electric heater, the edge part 201 of metallic plate 1 and the top 35 of drift are heated to be 150 ℃, make simultaneously in the cooling fluid path 33 of coldplate 32 to make the angle R portion 36 of drift be cooled to-20 ℃ with non freezing solution ethylene glycol (ball is apt to the petrochemistry manufacturing) by cooling, drawing metallic plate 1, limit forming height at this moment increases substantially to 180mm (example 2 of the present invention).

In addition, improvement example as example 1 of the present invention, shown in table 5 (6), utilize built-in electric heater, the edge part 201 of metallic plate 1 and the top 35 of drift are heated to be 150 ℃, make simultaneously in the cooling fluid path 24 of punch die coldplate 23 to make the angle R portion 26 of punch die be cooled to-20 ℃ with non freezing solution ethylene glycol (ball is apt to the petrochemistry manufacturing) by cooling, drawing metallic plate 1, limit forming height at this moment is 165mm (example 3 of the present invention).

And then, further improvement example as example 1 of the present invention, shown in table 5 (7), utilize built-in electric heater, the edge part 201 of metallic plate 1 and the top 35 of drift are heated to be 150 ℃, making simultaneously in the cooling fluid path 33,24 of each coldplate 32,23 makes the angle R portion 36 of drift and the angle R portion 26 of punch die be cooled to-20 ℃ by cooling with non freezing solution ethylene glycol (ball is apt to the petrochemistry manufacturing), drawing metallic plate 1, the limit forming height of this moment further rises to 185mm (example 4 of the present invention).

Then, in the electric furnace of nitrogen atmosphere, metallic plate 1 is heated to be 200 ℃ in advance, do not use heater, only use cooling device, make in the cooling fluid path 33 of drift coldplate 32 to make the angle R portion 36 of drift be cooled to-20 ℃ with non freezing solution ethylene glycol (ball is apt to the petrochemistry manufacturing) by cooling, drawing metallic plate 1, at this moment, shown in table 5 (8), limit forming height is 165mm (example 5 of the present invention).

Then, in the electric furnace of nitrogen atmosphere, metallic plate 1 is heated to be 200 ℃ in advance, do not use heater, only use cooling device, make simultaneously in the cooling fluid path 24 of punch die coldplate 23 to make the angle R portion 26 of punch die be cooled to-20 ℃ with non freezing solution ethylene glycol (ball is apt to the petrochemistry manufacturing) by cooling, drawing metallic plate 1, at this moment, shown in table 5 (9), limit forming height is 165mm (example 6 of the present invention).

Then, in the electric furnace of nitrogen atmosphere, metallic plate 1 is heated to be 200 ℃ in advance, do not use heater, only use cooling device, make simultaneously in the cooling fluid path 33,24 of each coldplate 32,23 to make the angle R portion 36 of drift and the angle R portion 26 of punch die be cooled to-20 ℃ with non freezing solution ethylene glycol (ball is apt to the petrochemistry manufacturing) by cooling, drawing metallic plate 1, at this moment, shown in table 5 (10), limit forming height is 168mm (example 7 of the present invention).

The present invention also can demonstrate better superiority compared with the past under unimodal situation.

As mentioned above, according to the present invention, can improve limit forming height.For its principle, with in the past warm forging comparison and carry out following explanation.

Warm forging in the past, as shown in Figure 6, deep-draw is processed as object.In deep-draw processing, be used to form the inflow of the metallic plate of sidewall, almost all from edge part, the necessity that metallic plate itself extends is very little.In order to improve forming limit, the deformation drag of edge part is the smaller the better, and the deformation drag that can resist the side wall portion of the tension force that is used to introduce edge part is the bigger the better.Therefore, in warm forging in the past, the heating edge part, cooling side wall portion can reach the raising of forming limit by cooling drift integral body.

But, when the double-peak shape shown in shaping Fig. 5 A,, exist hardly from the inflow of the metallic plate at edge especially in peak and peak-to-peak part, in order to supply with the metallic plate that is used to form side wall portion, can only extend metallic plate wherein.This has decisive different with deep-draw processing.In fact, the metallic plate of which part can extend, and according to circumstances has very large deviation, the top of drift and edge part because not with the friction of punch die, so can not move, can not extend yet.Therefore, metallic plate, all non-friction portions of angle R portion from the angle R portion of drift to punch die extend, wherein, extend easily with the contact portion Pcp (the K portion among Fig. 5 A) of in the border of the friction part of punch die and non-friction part and angle R portion drift with the contact portion Pcd (the L portion among Fig. 5 A) of the angle R portion of punch die, so be easy to generate fracture herein.

In order to improve forming limit, need make the distortion of following extension not concentrate on a place as far as possible, but be dispersed in the wide region.Therefore, as shown in the present, make the part (Pcp, Pcd) of the metallic plate that the angle R portion of the angle R portion of the drift of concentrating easily with the distortion of following extension or punch die contacts, improve deformation drag (hot strength TS) on every side with respect to cooling off relatively, for the top of drift and edge part such because repressed part (Ph, Phb, Pb, Pd) is extended in friction, at least reduce deformation drag (hot strength TS) with respect to improving temperature relatively on every side, suppress thus to follow the distortion of extension to concentrate on a place, then can improve forming limit.

For example, in the example of Fig. 5 A, concentrate the distortion of following extension in the Partial K portion of the metallic plate that contacts with the angle R portion of drift.For with its buffering, only by heating edge part as above-mentioned table 1 (2), when perhaps heating the top of drift as table 1 (3), be subjected to strong constraint from each the opposing party's the top or the edge part of drift, its result, it is insufficient to suppress to follow the distortion of extension to focus on the effect at a place, so be necessary as the example heating edge part of table 1 (4) and top two sides of drift, suppress to follow the distortion of extension to concentrate on a place, it is disperseed to two sides.In addition, not only heat two sides,, can obtain better effect if the part that will not heat is actively cooled off.

On the other hand, shown in table 1 (5), the intensity of the part Pcp of the metallic plate that contacts with this part improves in the angle R portion of cooling drift, then can improve forming limit, but then, the position that produces fracture can move to the contact portion Pcd (the L portion among Fig. 5 A) with the angle R portion of punch die, the edge part heated metal board can flow into side wall portion from the angle R portion of punch die, originally with respect to around the part Pcd of the metallic plate that contacts with side wall portion of the angle R portion from punch die of the low-temperature high-strength high temperature low-intensity that becomes relatively, descend for the endurance that stretches, produce fracture.Therefore,, then such problem can be avoided, shown in table 2 (7), forming limit can be further improved if also actively cool off the angle R portion of punch die.

In addition, shown in table 1 (8), (9), (10), the heating of metallic plate does not utilize electric heater of imbedding punch die and blank holder or drift etc., but metal heating plate in advance, when drawing, only carry out the cooling of necessary part, also can obtain effect much at one.

In addition, as mentioned above, have in heating-up temperature T, chilling temperature T or these temperature difference that to make forming limit be maximum optimum value, it is according to the material behavior of the difference of the shape that is shaped or metallic plate and difference, shown in embodiment 2～4, optimum value by effectively finding out these is also set, and in above-mentioned shaping with the outstanding shape more than bimodal, can further improve its manufacturing limit.

As mentioned above, in the above description, for convenience, be illustrated, but for the shape of further complexity, perhaps under the situation of the above shape in three peaks, also can improve forming limit naturally for the situation of drawing double-peak shape.Under such situation, in other words the angle R portion of drift or the angle R portion of punch die, are " following the concentrated part of distortion of extension ".Make the part of the metallic plate that the distortion of following extension concentrates, with respect to being in low temperature (cooling) on every side relatively and making its hardening (high tensileization), perhaps with the part beyond it, with respect to being in high temperature (heating) on every side relatively and making its deliquescing (low hot strengthization), can reach action effect of the present invention thus.

Embodiment 6

In embodiment 1, the kind of metallic plate replaces SUS430, (contain C:0.153wt%, below the Si:1.5wt%, below the Mn:2.0wt%, below the P:1.0wt%, below the S:0.01wt%, below the Al:0.1wt%, surplus is Fe and unavoidable impurities to use high tension steel.TS=830Mpa, YS=440Mpa) the 0.6mm thickness material outside, the same with embodiment 1 and operate.

At first, do not carry out any heating or cooling and carry out drawing, do not produce fracture this moment and the limit (limit forming height) of the size shown in the h in can Fig. 5 B of drawing is 15mm (conventional example 1) with usual way.

Then, warm forging edge part 201,206, that existing Japanese kokai publication sho 50-137861 communique or Japanese kokai publication hei 11-309518 communique are put down in writing of carrying out metal heating plate 1 is shaped.That is, in Fig. 1,, utilize the electric heater that is built in these to be heated to be 150 ℃ with punch die heating plate 22 and blank holder heating plate 42, thus drawing metallic plate 1.Though the limit forming height of this moment rises to 17mm, the amplitude of improvement is very little, only can confirm by adding hot die 2 and blank holder 4, can not get effect of sufficient (conventional example 2) for the shaping of such double-peak shape.

And then, the edge part 201,206 of metal heating plate 1 not, the heating cushion 51 that utilizes built-in electric heater is heated to be 150 ℃ with the rear side of the contact portion of the top 35 of drift and metallic plate 1, drawing metallic plate 1, its result, limit forming height is 17.5mm.This also only is raising a little, we can say still to can not get effect of sufficient (comparative example).

Therefore, shown in table 1 (4), utilize built-in electric heater, the edge part 201,206 of metallic plate 1 and the top 35 of drift are heated to be 150 ℃, drawing metallic plate 1, the limit forming height of this moment is increased to 22mm (example 1 of the present invention).

Can know that from above result in high tension steel, building mortion of the present invention and manufacturing process also can obtain effect.

Embodiment 7

In embodiment 1, the kind of metallic plate replaces SUS430, use martensitic stainless steel (SUS420J1, JIS G 4305) (to contain C:0.2wt%, Si:0.8wt%, Mn:0.8wt%, P:0.04wt% are following, S:0.03wt% is following, Ni:0.5wt%, Cr:13wt%, surplus is Fe and unavoidable impurities) the 0.6mm thickness material outside, the same with embodiment 1 and operate.

At first, do not carry out any heating or cooling and carry out drawing, do not produce fracture this moment and the limit (limit forming height) of the size shown in the h in can Fig. 5 B of drawing is 16mm (conventional example 1) with usual way.

Then, warm forging edge part 201,206, that existing Japanese kokai publication sho 50-137861 communique or Japanese kokai publication hei 11-309518 communique are put down in writing of carrying out metal heating plate 1 is shaped.That is, in Fig. 1,, utilize the electric heater that is built in these to be heated to be 150 ℃ with punch die heating plate 22 and blank holder heating plate 42, thus drawing metallic plate 1.Though the limit forming height of this moment rises to 17.5mm, the amplitude of improvement is very little, only can confirm by adding hot die 2 and blank holder 4, can not get effect of sufficient (conventional example 2) for the shaping of such double-peak shape.

And then, the edge part 201,206 of metal heating plate 1 not, the heating cushion 51 that utilizes built-in electric heater is heated to be 150 ℃ with the rear side of the contact portion of the top 35 of drift and metallic plate 1, drawing metallic plate 1, its result, limit forming height is 17.5mm.This also only is raising a little, we can say still to can not get effect of sufficient (comparative example).

Therefore, shown in table 1 (4), utilize built-in electric heater, the edge part 201,206 of metallic plate 1 and the top 35 of drift are heated to be 150 ℃, drawing metallic plate 1, the limit forming height of this moment is increased to 23mm (example 1 of the present invention).

Can know that from above result in martensitic stainless steel, building mortion of the present invention and manufacturing process also can obtain effect.

As mentioned above, can be suitable for metallic plate of the present invention is ferrous metal plates such as ferritic stainless steel with excellent formability, martensitic stainless steel, high tension steel, is hot rolled steel plate or cold-rolled steel sheet (state of hot rolling, perhaps cold rolling state), or these annealed material.In addition, also go for the non-ferrous metal plate that titanium etc. is difficult to punching press.In addition, also go for these coated steel sheet or clad steel.

Utilize possibility on the industry

According to the present invention, can improve the forming limit when stamping, stamping extremely effective for the parts of the difficulty that is shaped can extensively utilize when the parts of stamping automobile, furniture, household electrical appliances etc., has very big value industrial.

Table 1

Table 2

Table 3

Table 4

Table 5

Claims (16)

1. the press molding equipment of a metallic plate, has drift, punch die, blank holder, has device to described metallic plate additional temp difference, make the temperature T d of contact portion (Pd) of described punch die and described metallic plate, the temperature T b of the contact portion of described blank holder and described metallic plate (Pb), the temperature T hb of the rear side (Phb) of the contact portion of the temperature T h of the top of described drift and the contact portion of described metallic plate (Ph) or the top of described drift and described metallic plate, the temperature T cd that is higher than the contact portion (Pcd) of the angle R portion of the temperature T cp of contact portion (Pcp) of the angle R portion of drift and described metallic plate and punch die and described metallic plate, it is characterized in that having the cooling device of the contact portion (Pcd) of cooling angle R portion of described punch die and described metallic plate.

2. the press molding equipment of metallic plate according to claim 1, the cooling device that also has the contact portion (Pcp) of the angle R portion of the described drift of cooling and described metallic plate.

3. the press molding equipment of a metallic plate, have drift, punch die, blank holder, it is characterized in that having: the heater that heats at least one part in the contact portion (Pb) of the contact portion (Pd) of described punch die and described metallic plate and described blank holder and described metallic plate; Heat the heater of at least one part in the rear side (Phb) of contact portion of the top of the top of described drift and contact portion of described metallic plate (Ph) and described drift and described metallic plate; And the cooling device that cools off the contact portion (Pcd) of the angle R portion of described punch die and described metallic plate.

4. the press molding equipment of metallic plate according to claim 3 is characterized in that, also has the cooling device of the contact portion (Pcp) of cooling angle R portion of described drift and described metallic plate.

5. the press-processing method of a metallic plate, has drift in use, punch die, when the metallic plate press molding equipment of blank holder carries out the drawing of metallic plate, carry out drawing in the time of to described metallic plate additional temp difference, make the temperature T d of contact portion (Pd) of described punch die and described metallic plate, the temperature T b of the contact portion of described blank holder and described metallic plate (Pb), the temperature T hb of the rear side (Phb) of the contact portion of the temperature T h of the top of described drift and the contact portion of described metallic plate (Ph) or the top of described drift and described metallic plate, the temperature T cd that is higher than the contact portion (Pcd) of the angle R portion of the temperature T cp of contact portion (Pcp) of the angle R portion of drift and described metallic plate and punch die and described metallic plate, it is characterized in that, in the contact portion (Pcd) of angle R portion of cooling off described punch die and described metallic plate, carry out drawing.

6. the press-processing method of metallic plate according to claim 5 carries out drawing in the contact portion (Pcp) of angle R portion of cooling off described drift and described metallic plate.

7. the press-processing method of a metallic plate, has drift in use, punch die, when the metallic plate press molding equipment of blank holder carries out the drawing of metallic plate, at least one part in the contact portion (Pb) of the contact portion (Pd) that heats described punch die and described metallic plate or described blank holder and described metallic plate, and the contact portion of the top of described drift and described metallic plate (Ph) time, carry out drawing, it is characterized in that, it is characterized in that, in the contact portion (Pcd) of angle R portion of cooling off described punch die and described metallic plate, carry out drawing.

8. the press-processing method of metallic plate according to claim 7 is characterized in that, carries out drawing in the contact portion (Pcp) of angle R portion of cooling off described drift and described metallic plate.

9. the press-processing method of a metallic plate, when the metallic plate press molding equipment that has drift, punch die, a blank holder in use carries out the drawing of metallic plate, in advance described metallic plate is heated, and in the contact portion (Pcd) of angle R portion of cooling off described punch die and described metallic plate, carry out drawing.

10. the press-processing method of metallic plate according to claim 9 in the contact portion (Pcp) of angle R portion of cooling off described drift and described metallic plate, carries out drawing.

11. the press-processing method of a metallic plate, has drift in use, punch die, when the metallic plate press molding equipment of blank holder carries out the drawing of metallic plate, at least one part in the contact portion (Pb) of the contact portion (Pd) that heats described punch die and described metallic plate or described blank holder and described metallic plate, heat at least one part in the rear side (Phb) of contact portion of the top of the top of described drift and contact portion of described metallic plate (Ph) or described drift and described metallic plate, and make the contact portion (Pcd) of the angle R portion of the contact portion (Pcp) of the angle R portion of described drift and described metallic plate and described punch die and described metallic plate the temperature remains within the normal range or cooling the time, carry out drawing, meanwhile, confirm that the crackle that adds man-hour produces the position, if crackle appears at the part that the top of described drift and the contact portion of described metallic plate (Ph) and its rear side (Phb) are clamped, then reduce at least one among the heating-up temperature Thb of rear side (Phb) of contact portion of the top of the heating-up temperature Th of the top of described drift and the contact portion of described metallic plate (Ph) or described drift and described metallic plate, and/or the chilling temperature Tcp of the contact portion (Pcp) of the angle R portion of the described drift that raises and described metallic plate, if crackle appears at the angle R portion of described drift and the contact portion (Pcp) of described metallic plate, in the heating-up temperature (Thb) of the rear side (Phb) of the contact portion of the heating-up temperature Th of the top of described drift and the contact portion of described metallic plate (Ph) of then raising or the top of described drift and described metallic plate at least one, and/or reduce the chilling temperature (Tcp) of the contact portion (Pcp) of the angle R portion of described drift and described metallic plate, repeat drawing once more, find out the temperature difference that makes manufacturing limit the highest thus.

12. the press-processing method of a metallic plate, has drift in use, punch die, when the metallic plate press molding equipment of blank holder carries out the drawing of metallic plate, at least one part in the contact portion (Pb) of the contact portion (Pd) that heats described punch die and described metallic plate or described blank holder and described metallic plate, heat at least one part in the rear side (Phb) of contact portion of the top of the top of described drift and contact portion of described metallic plate (Ph) or described drift and described metallic plate, and make the contact portion (Pcd) of the angle R portion of the contact portion (Pcp) of the angle R portion of described drift and described metallic plate and described punch die and described metallic plate the temperature remains within the normal range or cooling the time, carry out drawing, meanwhile, confirm that the crackle that adds man-hour produces the position, if crackle appears at the angle R portion of described punch die and the contact portion (Pcd) of described metallic plate, then reduce the chilling temperature Tcd of the contact portion (Pcd) of the angle R portion of punch die and described metallic plate, and/or among the heating-up temperature Tb of the contact portion (Pb) of the heating-up temperature Td of the contact portion (Pd) of raise described punch die and described metallic plate or described blank holder and described metallic plate at least one, if crackle appears at the part that the contact portion (Pb) of the contact portion (Pd) of described punch die and described metallic plate or described blank holder and described metallic plate is clamped, then reduce at least one among the heating-up temperature Tb of contact portion (Pb) of the heating-up temperature Td of contact portion (Pd) of described punch die and described metallic plate or described blank holder and described metallic plate, and/or the chilling temperature Tcd of the contact portion (Pcd) of the angle R portion of the described punch die that raises and described metallic plate, repeat drawing once more, find out the temperature difference that makes manufacturing limit the highest thus.

13. the press-processing method of a metallic plate, has drift in use, punch die, when the metallic plate press molding equipment of blank holder carries out the drawing of metallic plate, carry out drawing in the time of to described metallic plate additional temp difference, make the temperature T d of contact portion (Pd) of described punch die and described metallic plate, the temperature T b of the contact portion of described blank holder and described metallic plate (Pb), the temperature T hb of the rear side (Phb) of the contact portion of the temperature T h of the top of described drift and the contact portion of described metallic plate (Ph) or the top of described drift and described metallic plate, the temperature T cd that is higher than the contact portion (Pcd) of the angle R portion of the temperature T cp of contact portion (Pcp) of the angle R portion of drift and described metallic plate and punch die and described metallic plate, after the drawing, confirm that the crackle that adds man-hour produces the position, if crackle appears at the part that the top of described drift and the contact portion of described metallic plate (Ph) and its rear side (Phb) are clamped, then reduce at least one among the heating-up temperature Thb of rear side (Phb) of contact portion of the top of the heating-up temperature Th of the top of described drift and the contact portion of described metallic plate (Ph) or described drift and described metallic plate, and/or the chilling temperature Tcp of the contact portion (Pcp) of the angle R portion of the described drift that raises and described metallic plate, repeat drawing once more, find out the temperature difference that makes manufacturing limit the highest thus.

14. the press-processing method of a metallic plate, has drift in use, punch die, when the metallic plate press molding equipment of blank holder carries out the drawing of metallic plate, carry out drawing in the time of to described metallic plate additional temp difference, make the temperature T d of contact portion (Pd) of described punch die and described metallic plate, the temperature T b of the contact portion of described blank holder and described metallic plate (Pb), the temperature T hb of the rear side (Phb) of the contact portion of the temperature T h of the top of described drift and the contact portion of described metallic plate (Ph) or the top of described drift and described metallic plate, the temperature T cd that is higher than the contact portion (Pcd) of the angle R portion of the temperature T cp of contact portion (Pcp) of the angle R portion of drift and described metallic plate and punch die and described metallic plate, after the drawing, confirm that the crackle that adds man-hour produces the position, if crackle appears at the angle R portion of described drift and the contact portion (Pcp) of described metallic plate, among the heating-up temperature Thb of the rear side (Phb) of the contact portion of the heating-up temperature Th of the top of described drift and the contact portion of described metallic plate (Ph) of then raising or the top of described drift and described metallic plate at least one, and/or reduce the chilling temperature Tcp of the contact portion (Pcp) of the angle R portion of described drift and described metallic plate, repeat drawing once more, find out the temperature difference that makes manufacturing limit the highest thus.

15. the press-processing method of a metallic plate, has drift in use, punch die, when the metallic plate press molding equipment of blank holder carries out the drawing of metallic plate, carry out drawing in the time of to described metallic plate additional temp difference, make the temperature T d of contact portion (Pd) of described punch die and described metallic plate, the temperature T b of the contact portion of described blank holder and described metallic plate (Pb), the temperature T hb of the rear side (Phb) of the contact portion of the temperature T h of the top of described drift and the contact portion of described metallic plate (Ph) or the top of described drift and described metallic plate, the temperature T cd that is higher than the contact portion (Pcd) of the angle R portion of the temperature T cp of contact portion (Pcp) of the angle R portion of drift and described metallic plate and punch die and described metallic plate, after the drawing, confirm that the crackle that adds man-hour produces the position, if crackle appears at the angle R portion of described punch die and the contact portion (Pcd) of described metallic plate, then reduce the chilling temperature Tcd of the contact portion (Pcd) of described punch die and described metallic plate, and/or among the heating-up temperature Tb of the contact portion (Pb) of the heating-up temperature Td of the contact portion (Pd) of raise described punch die and described metallic plate or described blank holder and described metallic plate at least one, repeat drawing once more, find out the temperature difference that makes manufacturing limit the highest thus.

16. the press-processing method of a metallic plate, has drift in use, punch die, when the metallic plate press molding equipment of blank holder carries out the drawing of metallic plate, carry out drawing in the time of to described metallic plate additional temp difference, make the temperature T d of contact portion (Pd) of described punch die and described metallic plate, the temperature T b of the contact portion of described blank holder and described metallic plate (Pb), the temperature T hb of the rear side (Phb) of the contact portion of the temperature T h of the top of described drift and the contact portion of described metallic plate (Ph) or the top of described drift and described metallic plate, the temperature T cd that is higher than the contact portion (Pcd) of the angle R portion of the temperature T cp of contact portion (Pcp) of the angle R portion of drift and described metallic plate and punch die and described metallic plate, after the drawing, confirm that the crackle that adds man-hour produces the position, if crackle appears at the part that the contact portion (Pb) of the contact portion (Pd) of described punch die and described metallic plate or described blank holder and described metallic plate is clamped, then reduce at least one among the heating-up temperature Tb of contact portion (Pb) of the heating-up temperature Td of contact portion (Pd) of described punch die and described metallic plate or described blank holder and described metallic plate, and/or the chilling temperature Tcd of the contact portion (Pcd) of the angle R portion of the described punch die that raises and described metallic plate, repeat drawing once more, find out the temperature difference that makes manufacturing limit the highest thus.

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