JP2004042122A - Method and apparatus for molding to exceed elongation ratio of press mold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method having short production tact at a low cost and few initial investment capable of necking and deep drawing without cracking by one press, and to provide the molding apparatus. <P>SOLUTION: The molding apparatus is composed of a lower mold having a female die 2 for molding which exceeds the allowable elongation ratio, a upper mold having a male die 4 inserting in the female die, a cushion pin having a supporting pad 6 of a material 1 to be formed, a press plate 8 of a material to be formed, a slider 11 for pressing the edge part of the material to be formed from the different direction to the press center direction according to descent of the upper mold, and the pressing structure. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a molding method for performing molding that exceeds the elongation of a pressed product, that is, a deep drawing, and a molding apparatus used for the molding method.
[0002]
[Prior art]
At the time of pressing, when forming a molded product exceeding the elongation percentage, that is, a pressed product that requires deep drawing, for example, as shown in FIG. In order to prevent the generation of wrinkles (wrinkles) at the time of molding, a means for forcibly suppressing the material to be molded from entering the mold more than necessary was employed. However, according to this method, the member P shown in FIG. The necking N where the sheet thickness is locally reduced during the molding as in the case of 'may occur, and this is likely to progress to the crack B.
[0003]
As a method of avoiding the necking N and the crack B, as shown in FIG. 14, the deep drawing portion P1 is formed by dividing into, for example, a first stage a, a second stage b, and a third stage c in several times. Although reduction of the molding load per time is also performed, it is natural that the manufacturing cost per part is high and the production tact becomes long. Further, the number of molds also increases, which increases initial investment.
[0004]
For the same purpose as described above, the deep drawn portion P1 is formed by a plurality of parts having a small depth, for example, parts P1-1 and P1-2, as shown in FIG. However, this also leads to an increase in the manufacturing cost per part, as described above, and also increases the production tact time for assembling the divided parts, as well as the number of molds and the jig for assembling. Also increase initial investment.
[0005]
[Problems to be solved by the invention]
Accordingly, the problem to be solved by the present invention is to provide a low-cost, short-production tact and low-initial-cost molding method and molding apparatus capable of completing deep drawing or the like without necking or cracking in a single press operation. Is to provide.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides a molding method and a molding apparatus which exceed the elongation of a pressed product. The invention relating to a molding method characterized in that the molded part is molded while being fed into the mold from a direction different from the pressing direction according to the molding amount, and a lower mold having a female mold for performing molding exceeding the elongation. 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 material to be molded, a plate holder for the material to be molded, and pressing the end of the material to be molded in the pressing direction. The invention relates to a molding apparatus comprising a slider which presses in the direction of the center of the press in response to the lowering of the upper die from a different direction, and a pressing mechanism for the slider.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
A preferred embodiment of the present invention will be described with reference to FIGS. 1 to 8. The molding method of the present invention, which exceeds the elongation of the pressed product, involves forming In the process, the unformed part 1a of the material to be molded 1 is formed while being fed into the dies 3, 5 from a direction different from the pressing direction according to the amount of molding.
[0008]
Further, the molding apparatus of the present invention comprises: a lower mold 3 having a female mold 2 for molding exceeding the elongation; an upper mold 5 having a male mold 4 for pushing the female mold 2 of the lower mold 3; The cushion pin 7 having the pad 6 for supporting the material 1, the plate holder 8 of the material 1, and the end of the unformed part 1 a of the material 1 are moved from the direction 10 different from the pressing direction 9 into the upper mold 5. The slider 11 includes a slider 11 that presses in the direction of the center of the press in response to the downward movement, and a pressing mechanism 12 for the slider 11.
[0009]
The embodiment shown in FIGS. 1 to 12 will be described in more detail.
The pressed product to which the present invention is applied is a member P having a portion P1 which requires deep drawing in which a part of the depth is significantly greater than that of the other as shown in FIG. 6, for example.
[0010]
The principle of the molding method of the present invention will be described with reference to FIGS. 1 to 5. First, the forming material 1 for the member P has a wide portion 1 for a portion P1 requiring deep drawing as shown in FIGS. 'a is formed.
[0011]
After the molding material 1 having such a shape is placed on the pad 6 of the lower mold 3 and the cushion pin (not shown) which moves up and down in the female mold 2 of the lower mold 3, the upper mold 5 is lowered. Deep drawing is performed between the male die 4 and the female die 2. At this time, in the portion P1 requiring deep drawing, the molding is performed beyond the elongation of the material 1 to be formed, and the necking N and the crack B Risk of developing
[0012]
In order to avoid this, in the molding method of the present invention, the wide portion 1'a on both sides of the molding material 1, that is, the unmolded portion 1a, is caused to respond to the lowering of the upper die 5 by the slider 11 of the pressing mechanism described later. It is pressed toward the center of the press, and is molded while being fed into the female and male dies 2 and 4 of the dies 3 and 5. As a result, a clean and accurate press-formed product P having no necking N or crack B even in the deep drawn portion P1 can be obtained.
[0013]
The amount of pressing movement, the pressing direction and the like of the slider 11 are determined by experiments and the like, but the pressing direction 10 is perpendicular to the pressing direction 9 in the vertical section as shown in FIGS. In the case of a direction 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 of radius R having a center.
[0014]
Further, as shown in FIG. 4, the upper surface of the lower die 3 'and the lower surface of the upper die 5' are inclined in a gentle funnel shape, and the angle between the unmolded portion 1a and the completed portion is made a slight obtuse angle, so that the It is also conceivable to easily feed the minute 1a.
[0015]
In FIG. 5, the plate holder 8 having a concave portion 8a formed on the lower surface thereof to allow the movement of the slider 11 is installed so as to be pressed against the molding material 1 by a pressing spring S installed between the upper die 5 and the lower surface. Thus, it is possible to prevent "bounce" of the material 1 to be formed and to prevent wrinkles while allowing the deep drawing and feeding of the unformed material at the time of molding.
[0016]
Next, a 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 FIGS. A lower mold 3 provided, an upper mold 5 having a male mold 4 to be pressed into the female mold 2 of the lower mold 3, and a pad 6 for supporting the molding material 1 in the female mold 2 of the lower mold 3. A concave portion 8a is formed on the lower surface of the cushion pin 7 to allow the movement of the slider 11, which will be described later, and a pressing spring S provided between the lower surface of the upper die 5 presses the molding material 1 near the female die 2. A slider which presses the plate holder 8 of the placed molding material 1 and the end of the unmolded portion 1a of the molding material 1 toward the center of the press in response to the lowering of the upper die 5 from a direction 10 different from the pressing direction 9. 11 and a pressing mechanism 12 for the slider 11.
[0017]
The slider 11 is installed so as to slide on the lower mold 3 in this example, and a notch 13 for capturing the unformed portion 1a (1'a) of the workpiece 1 is provided at the inner end thereof, and a cam is provided at the outer end thereof. Each receiving portion 11a is formed, and is in contact with a cam portion 5a formed near the outer end of the upper die 5 so as to face the cam receiving portion 11a. A return spring (not shown) is suspended from the slider 11.
[0018]
Referring to the molding operation by the molding apparatus of the present invention as described above, the upper die 5 is raised in FIG. 7 and a space is formed between the lower die 3 and the upper die 5 (at this time, the plate retainer 8 is pressed. 7 is positioned below the state shown in FIG. 7 by the spring S, 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 put on a predetermined position on the pad 6.
[0019]
When the upper die 5 is lowered, the plate holder 8 contacts the upper surface of the workpiece 1 and presses the upper surface of the workpiece 1 via the pressing spring S. The cam portion 5a of the upper die 5 as the pressing mechanism 12 comes into contact with the material 1 and contacts the cam receiving portion 11a of the slider 11. FIG. 7 shows this state.
[0020]
When the upper mold 5 is further pushed down from the state shown in FIG. 7, the male mold 4 pushes down the molding material 1 together with the pad 6 to perform a predetermined molding with the female mold 2. The right and left sliders 11 are moved toward the center of the press via the cam receiving portions 11a while the cam portions 5a are in contact with the cam receiving portions 11a of the sliders 11, whereby the unformed portion 1 ( 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 being generated in the deep drawing portion P1 of the material 1 and the formed member P. At this time, the unformed portion 1a (1'a) of the material 1 is firmly caught by the notch 13 and does not shift.
[0021]
9 to 12 illustrate the pressing mechanism 12. In these figures, 1 is a material to be molded, 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 holder, and 13 is a notch for capturing the material to be molded. , S indicate pressure springs, respectively.
[0022]
First, FIG. 9 is classified into a mechanical cam system adopted in the press apparatus shown in FIGS. 7 and 8. To explain this again, a cam slider 14 ( The slider 11) has a cam receiving surface 14a (the cam receiving portion 11a) formed at an outer end thereof. The cam receiving surface 14a has a cam surface 15a (the cam receiving portion) of a cam driver 15 provided on the upper die 5. The parts 5a) are configured to touch.
[0023]
Therefore, when the cam driver 15 moves down together with the upper die 5, the cam surface 15a of the cam slider 15 moves to the center of the press via the cam receiving surface 14a while the cam surface 15a contacts the cam receiving surface 14a of the cam slider 14. As a result, the unformed portion 1a (1′a) of the material 1 is sent between the male mold 4 and the female mold 2.
[0023]
The example shown in FIG. 10 is classified into a hydraulic system, in which 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 an outer end thereof. 17a is connected.
[0024]
Therefore, when the hydraulic cylinder 17 is operated in conjunction with the lowering of the upper die 5 and the left and right sliders 16 are respectively moved toward the press center via the piston rod 17a, the unformed portion 1a (1 ') of the material 1 is formed. a) will be sent between the male mold 4 and the female mold 2.
[0025]
The example shown in FIG. 11 is classified into a rack-and-pinion system. In the slider 18 installed such that the inner end slides on the lower mold 3, the slider 18 is formed on the lower mold 3 on the outer end. A rack 19 is provided in a portion facing the inside of the concave portion 3a, and a pinion 20 is meshed with the rack 19.
[0026]
Therefore, if the pinion 20 is rotated in conjunction with the lowering of the upper die 5 and the sliders 18 are respectively moved in the direction of the press center via the rack 19 meshing with the pinion 20, the unformed part 1a of the material 1 is formed as described above. (1′a) is sent between the male mold 4 and the female mold 2.
[0027]
The example shown in FIG. 12 is classified into a screw type, and a slider 21 mounted to slide on the lower mold 3 has a male screw of a female screw rotating device 22 mounted on the lower mold 3 at an outer end thereof. The rod 23 is fixed.
[0028]
Therefore, 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 rod 23 which is screwed to the female screw rotating device 22, and the unformed material 1 is formed. The minute 1a (1′a) is sent between the male mold 4 and the female mold 2.
[0029]
The amount by which the unformed part 1 (1′a) of the molding material 1 is sent between the male mold 4 and the female mold 2 by the pressing mechanism shown in FIGS. In the case of the dynamic cam system, the adjustment is made by the shapes of the cam surface 15a of the cam driver 15 and the cam receiving surface 14a of the cam slider 14.
[0030]
In the case of the hydraulic system shown in FIG. 10, the adjustment is performed by controlling the hydraulic pressure supplied to the hydraulic cylinder 17. In the case of the rack and pinion system shown in FIG. 11 and the screw system shown in FIG. 12, the rotation speed of an 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 target material 1, that is, the descending amount of the upper mold 5, and the like.
[0031]
In addition, the present invention can be applied to so-called U-bending and drawing in addition to the above examples, and can also be carried out by modifying a current die.
[0032]
【The invention's effect】
The molding method and the molding apparatus that exceed the elongation of the pressed article of the present invention, when molding the pressed article beyond its elongation, in the molding process of the molding material, the unmolded portion of the molding material is reduced to the molding amount. An invention relating to a molding method characterized in that molding is performed while being fed into a mold from a direction different from the pressing direction, a lower mold having a female mold for performing molding exceeding the elongation, and a female mold of the lower mold Upper die with a male die that pushes into the mold, Cushion pins with pads that support the material to be molded, Plate holder for the material to be molded, and Lowering of the upper die from the end different from the pressing direction with the end of the material to be molded In accordance with the invention of the forming method, deep drawing and the like are caused by necking and cracking. Can be completed without the occurrence of There is an effect that provides a form method.
[0033]
According to the invention of the molding apparatus, in addition to the effects of the invention of the molding method, deep drawing and the like can be efficiently completed without necking and cracking in one press operation, low production cost and short production tact time. There is an effect that a molding device with a small initial investment can be provided.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing an embodiment of a molding method exceeding the elongation of the pressed product of the present invention. FIG. 2 is a schematic plan view of the pressing product of the present invention. FIG. FIG. 4 is a schematic plan view showing a different example of the pressing direction of the material to be formed in the forming method exceeding the above. FIG. 4 shows another example of the pressing direction of the material to be formed in the forming method exceeding the elongation of the pressed product of the present invention. FIG. 5 is a schematic cross-sectional view of the example shown in FIG. 1 in which a plate retainer is installed. FIG. 7 is a longitudinal sectional view of a molding apparatus for performing a molding method that exceeds the elongation percentage of the pressed product of the present invention, showing the state before molding. FIG. 8 is a molding method exceeding the elongation percentage of the pressed product of the present invention. In a longitudinal sectional view of a molding apparatus for performing, during or after molding FIG. 9 is a half cut longitudinal sectional view showing an example of a pressing mechanism in the molding device of the present invention. FIG. 10 is a half cut longitudinal sectional view showing a second example of a pressing mechanism in the molding device of the present invention. FIG. 12 is a half-section longitudinal sectional view showing a third example of the pressing mechanism in FIG. 12. FIG. 12 is a half-section longitudinal sectional view showing a fourth example of the pressing mechanism in the molding apparatus of the present invention. FIG. 13 is molded by a conventional molding method and molding apparatus. FIG. 14 is a perspective view of the same member as the member shown in FIG. 6; FIG. 14 is a perspective view schematically showing a manufacturing process of a member that has been subjected to one conventional measure so as not to generate the defective member shown in FIG.
FIG. 14 is a perspective view schematically showing a manufacturing process of a member in which another conventional measure is taken so as not to generate the defective member shown in FIG. 13.
[Explanation of symbols]
P, P '(a part of which has a remarkably deep shape) member P1 deep drawing portion N necking B crack 1 material 1a unformed portion (= wide portion 1a') 2 female mold 3 lower mold 4 male mold Reference Signs List 5 Upper die 5a Cam portion 6 Pad 7 Cushion pin 8 Plate holder S Press spring 9 Press direction 10, 10 '(different from the press direction) 11 Slider 11a Cam receiving portion 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 screw rotation device 23 Male screw rod.

Claims (7)

When molding a pressed product beyond its elongation, in the molding process of the material to be molded, the unformed part of the material to be molded is sent into the mold from a direction different from the pressing direction according to the amount of molding. A molding method that exceeds the elongation of a pressed product. A lower mold having a female mold for molding exceeding the elongation, an upper mold having a male mold for pushing into the female mold of the lower mold, a cushion pin having a pad for supporting a material to be molded, and a material to be molded A press product comprising: a plate presser, a slider that presses the end of the material to be formed toward the center of the press in response to the lowering of the upper die from a direction different from the pressing direction, and a pressing mechanism for the slider. Molding equipment for molding that exceeds the elongation percentage. A cam slider having the pressing mechanism slidably disposed on the lower mold and having a cam receiving surface formed on an outer end thereof; and a cam driver having a cam surface 15a provided on the upper mold and in contact with the cam receiving surface. The molding apparatus for performing molding that exceeds the elongation of a pressed product according to claim 2, characterized by comprising: 3. The press according to claim 2, wherein the pressing mechanism is configured by connecting a piston rod of a hydraulic cylinder installed on the lower mold to an outer end of a slider installed to slide on the lower mold. Molding equipment for molding that exceeds the elongation of the product. The pressing mechanism is provided with a rack at a portion of the slider, the inner end of which is slidably disposed on the lower mold, at the outer end of the slider facing the recess formed in the lower mold, and a pinion is provided on the rack. 3. The molding apparatus according to claim 2, wherein the molding exceeds the elongation rate of the pressed product. The elongation percentage of a pressed product according to claim 2, wherein the pressing mechanism fixes an external thread rod of a female screw rotating device installed on the lower mold to an outer end of a slider slidably installed on the lower mold. Molding equipment for performing molding that exceeds 7. The cam slider according to claim 2, wherein a notch is formed at an inner end of the cam slider to catch an unformed portion of the workpiece. A molding apparatus for performing molding that exceeds the elongation percentage of the pressed product according to any one of the preceding claims.

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