JPS5951398B2 - Progressive press processing method using an extendable feed bar - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves unwinding a single turn of a coiled material and continuously feeding it into a mold so that it is pressed into the desired product shape as it passes through the mold. The present invention relates to a progressive repress processing method.

Generally, a transfer method or a progressive method is adopted for mass production in press working, but the transfer method requires a transfer device to transport the press mold and the product (material), which is expensive.
The progressive feeding method is extremely economical because the coiled material is continuously unwound and fed into the mold in order while each section is pressed as desired.

Therefore, in the case of a simple flat pressing process, the progressive method is more preferable than the transfer method.

However, when pressing a product having a bulge in the center as shown in FIGS. 1 and 3, the material undergoes shrinkage deformation during the drawing process.

This string deformation also affects the bars that connect the materials of each section. Conventionally, there was no joint that could absorb the shrinkage deformation caused by this drawing process, so it was not possible to maintain a constant distance between the materials in each section, which is essential in the progressive feeding method.

Therefore, products having uneven portions in the feeding direction as shown in FIGS. 1 and 3 cannot be pressed by the progressive feeding method, and have had to be pressed by the transfer method.

The present invention was made in view of the above circumstances, and it is made possible to stretch the joint between the materials of each section so as to absorb the shrinkage deformation during the drawing process, and press into the elongated holes on both sides of this joint. The drawing process is performed by inserting a fixed block into the upper mold of the machine.Examples of the present invention will be described in detail below with reference to the drawings.

In the case of this example, as shown in Fig. 2 and Fig. 4, there are six processing locations as a progressive die, and the process names are sequentially 1st notch 4 → 2nd notch 8 → play o → drawing D → hole punching. [F] → Division [F].

Now, in the first notch step □ of the material 1 that has been rewound from the left, a long hole 77 is punched between the notches 2 and 3 that are vertically symmetrical with respect to the center, the reference hole □ in the center, and the notch 23. Ru. This elongated hole allows insertion of a knife-shaped protuberance provided on the underside of the upper die of the press, and is 200 mm wider than the width of the protrusion.
A long hole that is ~3 times the length is appropriate. In the second notch step 8, the notches 55 at the top and bottom of the elongated hole and the notch 6 at the center are cut out. The notch 55 is punched out to leave a rim of a constant width around the elongated hole 77 to form an expandable feed bar 8.

As shown in FIG. 5, the extensible feed bar 8 has an elongated hole 77 and both ends of the elongated hole 77 in a direction perpendicular to the feeding direction of the material 1 at the joint between the mutually adjacent materials [phase] and materials @. It has a bellows-like shape with a rim of a relatively narrow constant width on the periphery, and is formed so that it is easily distorted when the material [phase] and @ are pulled outward.

In the next play step C, no processing is performed due to the strength and dimensions of the press die.

Claims (1)

[Claims] 1. Material 1 is placed at the joint between the mutually adjacent materials 10 and 11 in progressive press processing including the drawing process.
An extensible feed bar 8 is provided with elongated holes 7, 7 in a direction perpendicular to the feeding direction of the elongated holes 7, 7, and a relatively narrow rim 12 of a constant width is provided at the peripheral edges of both ends of the elongated holes 7, 7. On the other hand, in the drawing process of the press, the knife-shaped blocks 13, 13 provided downward on the upper mold are inserted into the elongated holes 7, 7, and the drawing process is performed, and the amount of shrinkage of the material that occurs at this time is calculated by A progressive press processing method using an extensible feed bar, characterized in that the drawing process in the progressive press can be performed continuously by absorbing the expansion deformation of the hole.