JP2009101421A - Method and device for forming pressed article beyond its stretch rate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method which enables deep-drawing without the occurrence of necking or breaking and requires a low-cost, a short production tact time and little initial investment, and to provide a device therefor. <P>SOLUTION: At the time of forming a pressed article beyond its stretch rate, a method for forming the pressed article which enables deep-drawing without the occurrence of necking or breaking is as follows. A wide part for deep-drawing is prepared beforehand in material to be formed. The wide part is formed by a cam driver which moves responsively to an upper die and by a cam slider which is pressed by the cam driver, while the wide part is fed into the die in the state that the wide part is held down by the notch of the cam slider. A device for forming the pressed article which enables deep-drawing without the occurrence of necking or breaking comprises: a lower die having a female type which performs forming beyond its stretch rate, the upper die having a male type which is forced into the female type, a cushion pin which holds the material to be formed, a plate hold-down device, the cam driver which moves responsively to the upper die, the cam slider which has the notch formed at its inside end to grip an unformed part of the material to be formed and presses the material to be formed in the direction of the center of pressure with the cam driver. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

    The present invention relates to a molding method for performing molding exceeding the elongation rate of a press product, and a molding apparatus used for the molding method.

  In the case of forming a press product that requires elongation at the time of pressing, that is, a pressed product that requires deep drawing, for example, a member P having a partly deep shape as shown in FIG. In order to prevent the generation of wrinkles (wrinkles) at the time of molding, means for strongly suppressing the molding material from entering the mold more than necessary has been adopted, but when using this method, the member P shown in FIG. As described above, a necking N having a locally thin plate thickness may occur during molding, and this is likely to proceed to crack B.

  As a method of avoiding the necking N and the crack B, as shown in FIG. 14, the deep-drawn portion P1 is formed in several steps, for example, a first stage a, a second stage b, and a third stage c. Although the molding load is reduced, the production cost per part is naturally high and the production tact is long. Furthermore, since the number of molds increases, the initial investment increases.

For the same purpose as described above, as shown in FIG. 15, the deep-drawn portion P1 is composed of a plurality of parts having a shallow depth, for example, parts P1-1 and P1-2, and these are combined to be integrated by welding or the like. However, this also causes an increase in production cost per part as described above, and the production tact becomes longer due to the assembly of the divided parts, as well as the number of molds and assembly jigs. Increase initial investment.
JP-A-60-190327

  Therefore, the problem to be solved by the present invention is a low cost, low production tact and low initial investment molding method and molding apparatus capable of completing deep drawing and the like without necking and cracking in one press operation. Is to provide.

  In order to solve the above-mentioned problems, the molding method and the molding apparatus exceeding the elongation rate of the press product according to the present invention provide a wide part for deep drawing when forming the press product exceeding the elongation rate. In addition, a cam driver that responds to the lowering of the upper mold in a state where the splashing is suppressed by the notch of the cam slider, which will be described later, and a notch that catches an unmolded part of the material to be molded is formed at the inner end. The invention relates to a molding method characterized in that the cam driver is pressed toward the center of the press by the cam driver, and is molded while being fed into the mold from a direction different from the press direction according to the molding amount, and the elongation rate A lower mold having a female mold for performing molding, an upper mold having a male mold to be pushed into the female mold of the lower mold, a cushion pin having a pad for supporting the molding material, and a plate presser of the molding material And under the upper mold A cam driver that responds to the movement and a notch that catches an unmolded portion of the molding material at the inner end, and the cam driver presses the end of the molding material from a direction different from the pressing direction toward the center of the press. And an invention relating to a molding apparatus.

  A preferred embodiment of the present invention will be described with reference to FIGS. 1 to 8. In the molding method exceeding the elongation rate of the press product of the present invention, when the press product is molded exceeding the elongation rate, the molding material 1 has a depth. A cam driver that responds to the lowering of the upper die 5 in a state in which a wide portion 1'a is provided for the drawing and the wide portion 1'a is pushed up by a notch 13 of the cam slider 11 described later. 15 and a notch 13 that catches an unmolded portion of the material 1 to be molded at the inner end, and a cam slider 11 that is pressed toward the center of the press by the cam driver 15, a direction different from the press direction according to the molding amount. Is molded while being fed into the mold.

  Further, the molding apparatus of the present invention includes a lower mold 3 provided with a female mold 2 that performs molding exceeding the elongation rate, an upper mold 5 provided with a male mold 4 that is pushed into the female mold 2 of the lower mold 3, and a molding target. A cushion pin 7 having a pad 6 for supporting the material 1, a plate retainer 8 of the material 1 to be molded, a cam driver 15 that responds to the lowering of the upper mold 5, and an unmolded portion of the material 1 to be molded at the inner end A notch 13 for catching 1a is formed, and the cam driver 15 includes a cam slider 11 that presses the end of the molding material 1 from a direction different from the press direction toward the center of the press.

The embodiment shown in FIGS. 1 to 12 will be described in more detail.
The press product to which the present invention is applied is a member formed by bending, such as the bottom portion of the engine oil pan (oil tank) as shown in FIG. P.

  The principle of the molding method according to the present invention will be described with reference to FIGS. 1 to 5. First, the molding material 1 for the member P includes a wide portion 1 for a portion P1 requiring deep drawing as shown in FIGS. 'a' is formed.

  After the workpiece 1 having such a shape is placed on the pad 6 of the lower die 3 and the cushion pin (not shown) that moves up and down in the female die 2 of the lower die 3, the upper die 5 is lowered. Deep drawing is performed between the male mold 4 and the female mold 2. At this time, in the portion P 1 requiring deep drawing, molding exceeding the elongation rate of the molding material 1 is performed, and the necking N and crack B are performed. There is a risk of causing.

  In order to avoid this, in the molding method of the present invention, the wide part 1′a on both sides of the molding material 1, that is, the unmolded portion 1a, the cam driver 15 that responds to the lowering of the upper mold 5 and the molding at the inner end. A notch 13 for catching the unformed portion 1a of the material 1 is formed, and the unshaped portion 1a of the material 1 to be formed is cut by the cam slider 11 pressed by the cam driver 15 toward the center of the press. Necking N and crack B do not occur in the deep-drawn portion P1 by molding while feeding it into the female molds 3 and 5 and the male molds 2 and 4 in a state where the flip-up is suppressed by the notch 13. A clean and accurate press molded product P is obtained.

  The amount of pressing movement and the pressing direction of the slider 11 are determined by experiments or the like. The pressing direction 10 is perpendicular to the pressing direction 9 in the vertical section as shown in FIGS. 1 and 2, and is also pressed in the horizontal section. When the direction is perpendicular to the axis 9 ′ passing through the direction 9, or as shown in FIG. 3, the vertical section is perpendicular to the pressing direction 9, but the horizontal section is on the axis 9 ′ passing through the pressing direction 9. It is conceivable to set the pressing direction 10 ′ on an arc having a radius R and having a center.

  Further, as shown in FIG. 4, the upper surface of the lower mold 3 ′ and the lower surface of the upper mold 5 ′ are inclined into a loose funnel shape, and the angle between the unmolded portion 1a and the completed portion is slightly obtuse, and the unmolded by the slider 11 It is also possible to facilitate feeding of the minute 1a.

  5 is provided such that a plate retainer 8 having a recess 8a that allows movement of the slider 11 on the lower surface is pressed against the molding material 1 by a pressing spring S disposed between the lower surface of the upper mold 5 and the lower surface. Thus, it is possible to prevent the material 1 from being “bounced up” and to prevent wrinkles while allowing the deep drawing and unmolded parts to be fed during molding.

  Next, the molding apparatus for realizing the molding method of the present invention will be described in detail with reference to FIGS. 7 to 12. The overall apparatus of the present invention is as shown in FIG. 7 and FIG. A lower mold 3 provided; an upper mold 5 provided with a male mold 4 that is pushed into the female mold 2 of the lower mold 3; and a pad 6 that supports the material 1 to be molded in the female mold 2 of the lower mold 3. A recess 8a that allows movement of the slider 11 described later is formed on the lower surface of the cushion pin 7, and a pressing spring S installed between the lower surface of the upper mold 5 and the molding material 1 is pressed near the female mold 2. A plate presser 8 of the molding material 1 installed, a cam driver 15 that responds to the lowering of the upper mold 5, and a notch 13 that catches an unmolded portion 1 a of the molding material 1 are formed at the inner end, and the cam The end portion of the molding material 1 is moved from the direction different from the pressing direction to the center of the press by the driver 15. Consisting of pressing mechanism 12 which consists of applying the cam slider 11 Metropolitan

  In this example, the slider 11 is installed so as to slide on the lower mold 3, and the notch 13 for capturing the unmolded portion 1 a (1 ′ a) of the material 1 to be molded is disposed at the inner end thereof. A cam receiving portion 11a is formed on the upper die 5 and is in contact with the cam portion 5a formed near the outer end of the upper mold 5 so as to face the cam receiving portion 11a. A return spring (not shown) is suspended from the slider 11.

  The molding operation by the molding apparatus of the present invention as described above will be described. In FIG. 7, the upper die 5 is raised and a space is formed between the lower die 3 and the upper die 5 (at this time, the plate retainer 8 is pressed). The spring S is positioned below the state of FIG. 7, and the upper surface of the pad 6 is positioned flush with the upper surface of the lower mold 3 by the cushion pin 7). And it puts on the predetermined position on the pad 6.

  When the upper mold 5 is lowered, the plate presser 8 is pressed through the pressing spring S while contacting the upper surface of the molding material 1, and the lower surface of the male mold 4 is molded on the pad 6. The cam portion 5 a of the upper mold 5 as the pressing mechanism 12 is in contact with the cam receiving portion 11 a of the slider 11. This state is shown in FIG.

  If the upper die 5 is further pushed down from the state of FIG. 7, the male die 4 pushes down the material 1 together with the pad 6 to perform predetermined molding with the female die 2. During this time, the upper die 5 is lowered. At the same time, the cam portion 5a is in contact with the cam receiving portion 11a of the slider 11, and the left and right sliders 11 are moved toward the center of the press through the cam receiving portion 11a. (1′a) is fed between the male mold 4 and the female mold 2. Therefore, it is possible to prevent the necking N and the crack B from occurring in the material 1 and the deep drawn portion P1 of the molded member P. At this time, the unmolded portion 1a (1'a) of the material 1 to be molded is firmly caught by the notch 13, and there is no “bounce” including displacement in all directions.

  9 to 12 illustrate the pressing mechanism 12. In these figures, 1 is a molding material, 2 is a female mold, 3 is a lower mold, 4 is a male mold, 5 is an upper mold, 6 is a pad, 8 is a plate retainer, and 13 is a notch for capturing the molding material. , S indicates a pressing spring, respectively.

  First, FIG. 9 is classified into the mechanical cam system employed in the press apparatus shown in FIGS. 7 and 8, and this will be described again. The cam slider 14 (slider mounted on the lower die 3) ( The slider 11) has a cam receiving surface 14a (the cam receiving portion 11a) formed at an outer end thereof, and the cam receiving surface 14a has a cam surface 15a of the cam driver 15 provided in the upper die 5 (the cam 11). The part 5a) is configured to contact.

  Therefore, when the cam driver 15 is lowered together with the upper die 5, the cam surface 15a is in contact with the cam receiving surface 14a of the cam slider 14, and the left and right cam sliders 14 are moved toward the center of the press through the cam receiving surface 14a. Thus, the unmolded portion 1a (1′a) of the material 1 is sent between the male mold 4 and the female mold 2.

  The example shown in FIG. 10 is classified as a hydraulic system, and a slider 16 installed to slide on the lower mold 3 has a piston rod of a hydraulic cylinder 17 installed on the lower mold 3 at the outer end thereof. 17a is connected.

  Accordingly, if the hydraulic cylinder 17 is operated in conjunction with the lowering of the upper die 5 and the left and right sliders 16 are moved toward the center of the press via the piston rod 17a, the unmolded portion 1a (1'1 ') a) is sent between the male mold 4 and the female mold 2.

  The example shown in FIG. 11 is classified into a rack and pinion system, and the slider 18 installed so that the inner end side slides on the lower mold 3 is formed on the lower mold 3 on the outer end side. A rack 19 is provided at a portion facing the recess 3 a, and a pinion 20 is engaged with the rack 19.

  Accordingly, if the pinion 20 is rotated in conjunction with the lowering of the upper die 5 and the sliders 18 are respectively moved toward the center of the press via the racks 19 meshing with the pinion 20, the unmolded portion 1a of the material 1 to be molded is the same as described above. (1′a) is fed between the male mold 4 and the female mold 2.

  The example shown in FIG. 12 is classified into a screw system, and the slider 21 installed so as to slide on the lower mold 3 has a male screw of the female screw rotating device 22 installed on the lower mold 3 at the outer end thereof. The rod 23 is fixed.

  Accordingly, when the female screw rotating device 22 is operated in conjunction with the lowering of the upper die 5, the sliders 21 on both sides move toward the center of the press via the male screw rods 23 screwed to the upper die 5, and the unmolded material 1 is not formed. The minute 1a (1′a) is fed between the male mold 4 and the female mold 2.

  The amount of unmolded portion 1 (1′a) of the material 1 to be fed between the male mold 4 and the female mold 2 by the pressing mechanism shown in FIGS. 7 to 12 is the machine shown in FIGS. In the case of the conventional cam system, the cam driver 15 adjusts the shape of the cam surface 15a and the cam receiving surface 14a of the cam slider 14.

In the case of the hydraulic system shown in FIG. 10, adjustment is performed by controlling the hydraulic pressure supplied to the hydraulic cylinder 17. Further, in the case of the rack and pinion method shown in FIG. 11 and the screw method shown in FIG. 12, the number of rotations of the electric motor for rotating the pinion 20 and the electric motor of the female screw rotating device 22 (both not shown) are electrically controlled. And adjust.
In any of the above cases, adjustment and control are performed in conjunction with the molding amount of the molding material 1, that is, the lowering amount of the upper mold 5.

  In addition to the above example, the present invention can be applied to so-called U-bending molding and drawing, and can also be implemented by remodeling the current mold.

  In the molding method and the molding apparatus exceeding the elongation rate of the press product of the present invention, when the press product is molded exceeding the elongation rate, a wide part is provided in the material to be molded for deep drawing, and the wide part is provided. A cam driver that responds to the lowering of the upper mold while holding up the spring by the notch of the cam slider, and a notch that catches the unmolded part of the material to be molded are formed at the inner end. An invention relating to a molding method characterized in that a molding is performed while feeding into a mold from a direction different from the press direction according to a molding amount by a cam slider pressed in a direction, and a female die that performs molding exceeding elongation rate A lower mold provided, an upper mold provided with a male mold to be pushed into the female mold of the lower mold, a cushion pin provided with a pad for supporting the molding material, a plate presser of the molding material, and a lowering of the upper mold Cam driver that responds to A notch for catching an unmolded portion of the molding material at the inner end, and a cam slider that presses the end of the molding material from a direction different from the press direction toward the center of the press by the cam driver. Therefore, according to the invention of the present molding method, there is an effect of providing a molding method in which deep drawing and the like can be completed without occurrence of necking and cracking.

  According to the invention of the present molding apparatus, in addition to the effects of the invention of the molding method, deep drawing and the like can be completed efficiently without occurrence of necking and cracking in one press operation, low cost and short production tact time. There is an effect that a molding apparatus with little initial investment can be provided.

Schematic cross-sectional view showing an embodiment of a molding method exceeding the elongation rate of the press product of the present invention 1 is a schematic plan view of what is shown in FIG. The plane schematic diagram which shows the example from which the pressing direction of a molding material differs in the shaping | molding method exceeding the elongation rate of this invention press goods The cross-sectional schematic diagram which shows the further different example of the pressing direction of a molding material in the shaping | molding method exceeding the elongation rate of this invention press goods FIG. 1 is a schematic cross-sectional view of a plate presser installed in the example shown in FIG. The perspective view of the member which should apply the shaping | molding method and shaping | molding apparatus exceeding the elongation rate of this invention press goods This is a longitudinal cross-sectional view of a molding apparatus for carrying out a molding method that exceeds the elongation rate of the pressed product according to the present invention, and represents a state before molding. This is a longitudinal cross-sectional view of a molding apparatus for carrying out a molding method that exceeds the elongation rate of a press product according to the present invention, which represents during or after molding. Half-cut longitudinal sectional view showing an example of a pressing mechanism in the molding apparatus of the present invention Half-cut longitudinal sectional view showing a second example of the pressing mechanism in the molding apparatus of the present invention Half-cut longitudinal sectional view showing a third example of the pressing mechanism in the molding apparatus of the present invention Half-cut longitudinal sectional view showing a fourth example of the pressing mechanism in the molding apparatus of the present invention The perspective view of the same member as the member shown in FIG. 6 formed by the conventional forming method and forming apparatus The perspective view which shows schematically the manufacturing process of the member which gave one countermeasure conventionally so as not to produce the defective member shown in FIG. FIG. 14 is a perspective view schematically showing a manufacturing process of a member in which another countermeasure is taken so as not to produce the defective member shown in FIG. 13.

Explanation of symbols

P, P ′ (part of which has a remarkably deep shape) P1 Deep drawing portion N Necking B Crack 1 Molded material 1a Unmolded portion (= wide portion 1a ′) 2 Female mold 3 Lower mold 4 Male mold DESCRIPTION OF SYMBOLS 5 Upper mold | type 5a Cam part 6 Pad 7 Cushion pin 8 Plate presser S Press spring 9 Press direction 10, 10 '(different from the press direction) 11 Slider 11a Cam receiving part 12 Pressing mechanism 13 Notch 14 Cam slider 14a Cam receiving surface 15 Cam driver 15a Cam surface 16, 18, 21 Slider 17 Hydraulic cylinder 17a Piston rod 19 Rack 20 Pinion 22 Female thread rotating device 23 Male thread rod.

Claims (3)

When forming beyond its elongation rate pressed product, it may be provided a width wide portions as deep drawing into the molded material, in a state of pressing the up splashing by cutouts rear serial cam slider the該巾wide portion, Press according to the amount of molding by a cam driver that responds to the lowering of the upper die and a cam slider that has an inner end formed with a notch that catches an unmolded part of the material to be molded and is pressed toward the center of the press by the cam driver. A molding method exceeding the elongation rate of a pressed product, wherein the molding is performed while feeding into a mold from a direction different from the direction. A lower mold having a female mold that performs molding exceeding the elongation rate, an upper mold having a male mold that is pushed into the female mold of the lower mold, a cushion pin having a pad that supports the molding material, and a molding material A plate driver, a cam driver that responds to the lowering of the upper mold, and a notch that captures an unmolded portion of the molding material are formed at the inner end, and the end portion of the molding material is different from the pressing direction by the cam driver. A molding apparatus for performing molding exceeding the elongation rate of a pressed product, comprising a cam slider pressed from the direction toward the center of the press. The molding apparatus for performing molding exceeding the elongation rate of a pressed product according to claim 2, wherein the upper surface of the lower mold and the lower surface of the upper mold are inclined in a loose funnel shape.

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