JPS6011574B2 - press equipment - Google Patents

Description

[Detailed Description of the Invention] In drawing processing using a single action press, the drawing depth can be made as shallow as possible by providing a fixed die face and a movable die face on the upper die, and therefore the amount of material used can be reduced. This invention relates to a press device that is intended to save money and improve workability and quality at the same time.

Conventionally, panels with a relatively small drawing depth are usually cushion-drawn using a single-action press, but when the product shape has an inverse part, there is a problem in holding the product down.

As a conventional press device, there is one shown in FIG. 1, for example. Its main parts are composed of an upper die 1, a lower die 2, a blank holder 3, etc., and the blank holder 3 is elastically supported by cushion pins 4. The part indicated by the symbol X in the figure is the inverse part of the product. In such conventional equipment, in order to prevent the occurrence of wrinkles, etc. on the product, the position a of the die face surface when the material is pressed is set to the lowest end position of the inverse part, that is, the lowest end position q of the upper mold. A structure that is lower than the point, that is, a, the height from the point to the top of the upper mold 1 is A, similarly, b, the height from the point to the top of the upper mold 1 is B, then A, > It is necessary to maintain the relationship B. Otherwise, blank holder 3, which is initially in the highest position.
The material sent to the upper surface of a (shown by the chain line) is placed on the die face surface l.
Before pressing with a, the 0 point will touch the material,
Since the structure was such that misalignment and wrinkles in the material were unavoidable, there was a problem in that the drawing depth had to be made larger than necessary even though it was not necessary for the product due to the relationship A,>&. . The present invention has been made in view of these conventional problems, and aims to solve the above problems by providing a fixed die face and a movable die face on the upper die.

The present invention will be explained below based on the drawings. FIG. 2 is a diagram showing an embodiment of the present invention.

First, to explain the configuration, 5 is an upper mold, 6 is a lower mold, 7 is a blank holder provided on the lower mold, 8 is a cushion pin for elastically supporting the blank holder, and 5a is attached to the upper mold 5. 9 is a movable die face provided on the upper die 5; 10 is an elastic body such as urethane or a spring that biases the movable die face 9 toward the blank holder of the lower die; 1 is the movable die face 9;
The stopper pin 11a is a sliding groove of the stopper pin, and 12 is a material. Then, when the upper die 5 is raised to the illustrated position, the relationship A2>B2, C2minB2 is established. The operation of the device having the above configuration will be explained.

After first placing the material 12 on the top surface of the blank holder 7,
When the upper die 5 is lowered, the movable die face 9 including a dot at the tip presses the material 12. Next, the lowermost point of the upper mold comes into contact with the material, and when the upper mold further descends, the fixed die face 5a coincides with the movable die face 9. Preliminary shaping of the material is performed after the material is pressed until the die faces 5a and 9 coincide. When the upper mold further descends, the cushion pins 7 descend to perform the drawing process. Generally, in drawing process, the die face a,,a
The two points reach the material earlier than the two points q and b and are pressed by the material with the die face including points a, aa, thereby preventing the occurrence of wrinkles, etc. Therefore, the above-mentioned lengths B and B2 The drawing depth will be determined by the size of.

According to this invention, by making point aa movable, the relationship of A2>& is maintained at the starting point of the material presser, so that when point b2 hits the material, the material is already being pressed, and at the time of completion of the drawing process, As a result of the die face moving up relative to the upper mold, the relationship C2≦flea can be established, and therefore, the required drawing depth can be made smaller, so that material can be saved.

Further, it is possible to omit or simplify post-processes such as trimming and flange-up, which are required when drawing deeper than necessary.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of the main part showing a conventional press device, Fig. 2 is a cross-sectional view of the main part showing an embodiment of the present invention in the pre-processing state, and Fig. 3 is a cross-sectional view of the main part in the completed state of processing. be. 6...Upper mold, 5a...Fixed die face,
6...Lower die, 7...Plank holder, 9.
...Movable die face. Figure J Figure 2 Figure 3

Claims (1)

[Claims] 1. A press device having an upper mold, a lower mold, and an elastically supported blank holder, characterized in that the upper mold is provided with a fixed die face and a movable die face biased toward the blank holder. Device.