JPS605383B2 - Floating die molding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for forming with a floating die.

For example, in the case of skirting a long, large-diameter head at the adjacent end, the die 2 shown in Figs. In the case of pressure forming using a so-called fixed die, and in the case of a member 6 in which the die and punch are integrated as shown in FIGS. 3 and 4, there is a gap between the lower die 7 and the material 8. A so-called slide-type movable die that is press-formed is known.

Incidentally, numerals 5 and 9 are the workpieces after molding, that is, the long head of a large lily. However, in the former case, the forming force applied by the punch is difficult to be transmitted to the deep part (part B) due to the frictional force between the die and the workpiece, and the phenomenon that part A is well filled but part B is difficult to fill can be avoided. I can't. This phenomenon becomes more pronounced as the length of the forming head becomes longer, or in hot forging where the frictional resistance is greater than in cold forging. In the latter case, contrary to the former case, the sufficiency of part B is good but the sufficiency of part A is poor. The reason is the same as in the former case. The present invention has been made in view of the above-mentioned drawbacks of the prior art, and specifically aims to provide an apparatus for forming well-balanced molding according to the flow of material by freely supporting the die. The structure of the present invention will be explained below according to the embodiment shown in FIGS. 5 and 6.

In the drawing, 1 river punch, 11 floating die, 12
is a die guide, 13 is a die push-up spring, 14 is a lower die,
15 is a raw material, and 16 is a workpiece after molding, that is, a long large tidying section. In the examples shown in Figures 1 and 2, the die is fixed against the flow of the material, and in the examples shown in Figures 3 and 4, the slide is pushed in at a speed higher than the flow of the material. However, in the method of the present invention, the die I1 is freely supported by the spring 13 and is moved according to the flow of the material 15, so the above-mentioned disadvantage can be avoided. Improved and well-balanced molding becomes possible. For example, punch 10 side (A section)
Assuming a situation where the material is well satisfied and the material on the lower mold 14 side (part B) is poor, the good material 15
This means that the adhesion between die 11 and die 11 is high, so die 1
1 corresponds to the material flow in section A, that is, the movement of the punch 10. This is the same condition as shown in FIGS. 3 and 4, where the punch and die move in unison. Under this condition, as is clear from the above explanation, the sufficiency on the B side is improved. This shows that molding progresses in a direction that improves the initially assumed unbalanced state. On the other hand, the lower mold 14 side (part B) is well filled, and the punch 10 side (part A) is well filled.
When assuming an unbalanced state in which the sufficiency of part) is poor, the behavior of the die 11 will still follow the material flow of the part B, which is well sufficed. Since there is almost no axial flow of the material in the B section, the conditions in this case are similar to those shown in FIGS. 1 and 2, where the die 11 is fixed to the lower die 14, and under this condition, The filling is improved, and the molding progresses in a direction that improves the unbalanced state. In this way, the molding always proceeds in the direction of correcting the unbalance, so that it is possible to obtain a good product without causing unbalanced filling defects as shown in the conventional example. As explained above, the present invention includes a lower mold that is fixedly inserted and held in the axial direction with the head of the material protruding by the length necessary for hemming, and a die guide fixed on the lower mold. a floating die that is guided so as to be raised and lowered within the die, whose upper end is pushed up to a position above the upper end of the material by a push-up spring, and has a through hole in the center that is larger than the diameter of the material and has a diameter for upsetting the material; It is capable of approaching and separating from the lower die, and has a diameter that is approximately the same as the diameter of the through hole of the die, and the head of the material held by the lower die is moved into the through hole of the die until the diameter of the through hole of the die is reached within the die. The floating die is moved toward the lower mold side against the push-up spring by the frictional force due to the compression and expansion diameter of the material, and the punch is compressed and expanded in the direction of the wafer. By preventing insufficient filling of the material, it is possible to perform upsetting forming of the head of the material in the die.Furthermore, the friction loss between the die and the material can be reduced, reducing the forming force and saving energy. can provide highly efficient molding equipment.

[Brief explanation of drawings]

FIGS. 1 and 2 and 3 and 4 are drawings showing conventional examples, respectively, and FIGS. 5 and 6 are drawings showing an apparatus according to the present invention. 10...Punch, 11...Floating die, 12...Dice guide, 13...Dice push-up spring, 14...Lower die, 15... ...Material, 16...Work after molding. Figure 1 Figure 2 Figure 8 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] 1. A lower die that is fixedly inserted and held in the axial direction with the head of the material protruding by the length necessary for upsetting, and a die guide fixed on the lower die that allows the material to move up and down. A floating die whose upper end is pushed up to a position above the upper end of the material by a push-up spring, and which has a through hole in the center that is larger than the diameter of the material and has a diameter for upsetting the material, and is capable of approaching and separating from the lower die. The diameter is approximately the same as the diameter of the through hole of the die,
a punch that enters the through hole of the die and compresses and expands the head of the material held by the lower die in the axial direction to the diameter of the through hole of the die to perform upsetting; A floating die molding device, characterized in that insufficient filling of the material in the die is prevented by moving the material closer to the lower mold side against an upward spring by the frictional force caused by the compressed and expanded diameter of the material.