JPS6350093B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to press molding, and particularly to a press molding apparatus suitable for obtaining a molded product having a free-form surface shape.

As shown by 1 in Figure 1, in order to obtain a molded product that is complicatedly bent in three dimensions, the degree of reduction is relatively large, and there is a relatively noticeable difference in height at the periphery of the molding, there are conventional methods. It used to be that press working was done in several stages, but this required a large amount of man-hours and several press machines not only for molding the product but also for manufacturing the mold. In addition, in the conventional press working, even if the required shape area of the molded product is within the range indicated by area A as shown in Fig. 2, the posture and shape of the material during wrinkle pressing cannot be adjusted. In order to stabilize the material, it was customary to perform deep drawing in a shape that includes area B in the diagram, but in this case, the amount of material shedding during drawing was large, resulting in severe wear on the wrinkle holding surface. In addition, it is difficult to maintain and control the correct wrinkle pressing surface accuracy during the production process, the noise associated with the slipping is high, and the material yield is poor due to the need for extra material as shown in area B. It had drawbacks.

In the present invention, a flow pressing surface parallel to the pressing direction is provided on the wrinkle press placed outside the forming surface of the punch or outside the forming surface of the punch, and a sliding pressure surface is provided on the die to form a predetermined gap with the flow pressing surface. Arrange the parts,
The purpose of this invention is to eliminate the above-mentioned drawbacks by sandwiching the edges of the material in the gap. The present invention will be explained in detail below based on the illustrated embodiments.

In FIGS. 3 to 5 illustrating the double drawing press mold, 11 is a material to be press-formed, and 2
is a die having a molding surface 21. 3 is a punch having a molding surface 31 corresponding to the molding surface 21, and a wrinkle presser 4 is disposed to surround the punch 3. A leading presser 42 is attached to the wrinkle presser 4 and is urged downward by a spring 41. An appropriate number of sliding pressure members 5 are disposed at appropriate locations on the outer peripheral side of the lower portion of the molding surface 21 of the die 2. The sliding pressure member 5 has a base 51 directly fixed to the die 2, and is connected to the base 51 by a pin 52, and presses the molding surface 21 within an allowable range.
Sliding pressure piece 53 attached to be movable toward the side
It is composed of. The sliding pressure piece 53 is urged toward the retracting side with respect to the molding surface 21 by the spring 54, and the impact caused by engagement with a rolling wheel 62, which will be described later, is applied to the outer lower end 55 of the sliding pressure piece 53. is accepted by contacting the base 51. Further, a sliding surface 56 parallel to the pressing direction is formed on the forming surface 21 side of the sliding pressure piece 53, and a sliding surface 57 parallel to the sliding surface 56 is formed on the opposite side to the sliding surface 56. , the surface position can be adjusted by shims 58. The wrinkle presser 4 disposed outside the molding surface 31 has the sliding pressure surface 5.
A flow pressing surface 44 that is parallel to the sliding pressure surface 6 and capable of pinching the material 11 is formed in a gap formed between the sliding pressure surface 56 and the material 11 on the side opposite to the flow pressing surface 44. A pressure adjusting member 6 that can press the sliding surface 57 during pressure is provided. The pressure regulating member 6 includes a rolling ring 62 which is biased toward the molding surface 21 by an elastic member 61 such as rubber or a coil spring and can come into contact with the sliding surface 57.

When the punch 3 and the crease presser 4 are in the raised position, when the material 11 is inserted into the set position on the die 2 and the crease presser 4 is lowered, the preceding presser 42
first clamps the material 11, and then the rolling wheels 62 engage with the sliding surface 57 to regulate the position of the sliding pressure member 5 (see FIG. 3). When the wrinkle presser 4 continues to descend, the lower surface of the portion where the flow pressing surface 44 is formed comes into contact with the material 11 and pushes the portion downward. As the pressing down progresses, from the stage where the flow pressing surface 44 of the wrinkle presser 4 begins to oppose the sliding pressing surface 56 of the sliding pressure member 5, the pressing down of the material 11 at that portion is continued with the material 11 being pinched between these surfaces. Continued. At this time, the material 11 and the sliding pressure member 5 are pressed against the flow pressing surface 44 of the wrinkle presser 4.
The clamping force is set as appropriate by the biasing force of the elastic member 61 and the shim 58 that is adjusted in advance. As mentioned above, the raw material 11 is pressed into the molding surface 21 with the material 11 being pressed between the sliding pressure surface 56 and the flow pressing surface 44, and the material 11 is pushed into the molding surface 21 in this pinched portion. The pushing is performed in a relatively restrained state, and in the part where the sliding pressure member 5 is not provided, the material 11 is pushed in a relatively free state, although it is influenced by the restrained part. The entire material 11 is in a state where gentle wrinkles are generated three-dimensionally, and an amount of material close to the amount of material of the molded product is pushed into the upper surface side of the die 2, and an ideal wrinkle presser gripping state is obtained. It will be done. At this time, it is necessary to appropriately set the number and position of the sliding pressure members 5, the direction of the sliding pressure surface 56, and the clamping force on a trial basis in order to correspond to the shape of the molded product. When the wrinkle presser 4 continues to descend, the material 11 is held between the die 2 and the wrinkle presser 4 at the peripheral edge of the molding surface 21, and then stops. Next, the punch 3 descends and its forming surface 31 presses the material 11 against the forming surface 21 of the die 2 to perform press forming, and then the punch 3 and wrinkle presser 4 move to the raised and retracted positions to complete the desired press forming. Goods can be obtained.

Note that in the case where the gap between the flow pressure surface 44 and the sliding pressure surface 56 may be made constant, the pressure regulating member 6 may omit the elastic member 61 and contact the sliding surface 57 rigidly. Further, in place of the above-mentioned sliding pressure member 5, the pressure regulating member 6 can be omitted if the sliding pressure member 7 itself is rigidly fixed to the die 2 as shown in FIG. . Further, as shown in FIGS. 1 and 4, a spring-up prevention member 8 is provided on the wrinkle presser 4, and a spring-up prevention member 81 is provided on the upper end of the sliding pressure member 71 as shown in FIG. Then, when the material starts to be squeezed between the sliding pressure surface and the flow pressure surface, the upper edge of the material comes into contact with the spring-up prevention members 8, 81 and is bent, which causes extra resistance. As a result, the pushing of the material is more effectively restrained at this portion, making it possible to feed the material in a suitable manner. Then, as shown in FIG. 6, the sliding surface 571 is a cam surface with appropriately set unevenness along the advancing direction of the wrinkle presser 4, or the sliding surface 571 is made into a cam surface with appropriately set unevenness as shown in FIG.
Similarly, when 62 is an appropriately set uneven surface along the advancing direction of the wrinkle presser 4, the pressing force of the material can be changed appropriately as the wrinkle presser 4 advances, so that the pushing amount of the material can be changed. can be changed over time, thereby making it possible to obtain an optimal material supply form that immediately corresponds to the shape of the molded product.
In addition, in the embodiment shown in FIG. 7, it is preferable to interpose an elastic member 611 such as rubber.

I have explained the double drawing press type above,
In the single drawing press die illustrated in FIG.
41 is formed, and a corresponding sliding pressure surface 564 is also formed directly on the die 2. In the example shown in FIG. 9 in which this is provided with a cushion 9, a sliding pressure surface 563 is formed on the cushion 9 which forms the lower die together with the die 2. Further, in the example shown in FIG. 10, the flow pressing surface 442 is formed on the punch 3 which becomes the lower mold, and the sliding pressing surface 565 is formed on the die 2 which becomes the upper mold, but the present invention can be achieved with either of these embodiments. It is possible to implement it. In addition, if the material is stably supported by the two symmetrical surfaces of the lower die as shown in FIGS. 8 and 9 above, the preceding presser that clamps the material in advance may be omitted. is also possible.

As described above, in the present invention, a flow pressing surface parallel to the pressing direction is provided on the wrinkle presser disposed outside the forming surface of the punch or outside the forming surface of the punch, and a predetermined gap is provided between the flow pressing surface and the die. Since the structure is such that a sliding pressure member is disposed and the edge of the material is held in the gap, the amount of wasted waste due to deep drawing, which is required to suppress wrinkles, is extremely small. The yield rate of the material is greatly improved and it approaches stretch molding, so there is no flow of material at the wrinkle holding part, and there is less wear on the wrinkle holding surface, making it easy to manage the appropriate wrinkle holding surface accuracy of the wrinkle holding surface. It also has the effect of preventing the generation of noise caused by the flow, and what is more noteworthy is that press forming of a free cross-sectional shape can be performed in one press process, thereby reducing the process time. It has various remarkable effects, such as making it easier to shorten the process, shortening the setup time, and simplifying the entire equipment.

[Brief explanation of the drawing]

Fig. 1 is a perspective view mainly showing the shape of a press-formed product according to the present invention, Fig. 2 is a vertical cross-sectional view schematically showing a conventional press die, and Figs. 3 to 5 show each stage of the first embodiment. Longitudinal sectional views shown in Figures 6 and 7, respectively.
The figures are partially enlarged views showing other embodiments.
Figures 1 to 10 are longitudinal cross-sectional views showing still other embodiments.
-C indicate each stage. 1... Molded product, 2... Die, 21... Molding surface,
3...Punch, 31...Forming surface, 4...Wrinkle presser, 42...Advance presser, 44...Flow pressing surface, 5...
...Sliding pressure member, 56...Sliding pressure surface, 57...Sliding surface,
6... Pressure regulating member, 8, 81... Splash prevention member.

Claims (1)

[Claims] 1. By inserting the material into a set position on the die when the punch and the crimp foot, which operates independently of the punch, are in the raised position, and then lowering the crimp foot, the crimp foot first A leading presser, which is equipped to be movable relative to that, presses the edge side of the material, which is the high part, against the contact area with the die, and while increasing the pinching force, a wrinkle presser is used to press the edge side, which becomes the low part of the material. At the same time as pressing down with the part side facing downward, a flow pressing surface parallel to the pressing direction formed on the wrinkle presser, and a sliding surface of a pressing member disposed on the die to face the flow pressing surface. On both sides of the material, bending and pressing are performed while pressing the edges of the material while changing the pressing force between the two surfaces as appropriate as the wrinkle presser progresses, and when the bottom surface of the wrinkle presser comes into contact with the die forming surface. Then, stop the descending of the wrinkle presser and hold the edge of the material between the flow pressing surface, the sliding pressure surface, the lower surface of the wrinkle press and the die forming surface, then lower the punch and use the forming surface to press the material into the die. A press forming method characterized by press forming the material by pressing it against the forming surface. 2. In a press mold equipped with a punch, a die, and a wrinkle presser that operates independently of the punch, a flow pressing surface parallel to the pressing direction and a wrinkle presser located on the outside of the molding surface of the punch, and a press die that is opposite to the wrinkle presser. A movable leading presser is provided, and the die is provided with a sliding member that forms a predetermined gap with the fluid pressing surface so as to be movable forward and backward with respect to the fluid pressing surface, and a back portion of the sliding member is slidable. A press molding apparatus characterized in that the wrinkle presser is equipped with a pressure regulating member that engages with the surface and presses it in the forward direction. 3. The device according to claim 2, wherein the pressure regulating member includes a rolling wheel that engages with the sliding surface via an elastic member. 4. The device according to claim 2, wherein the sliding pressure surface of the sliding pressure member has an appropriately set uneven shape along the pressing direction. 5. The apparatus according to claim 2, wherein the sliding surface of the sliding pressure member is formed as a cam surface having appropriately set irregularities along the pressing direction.