JPS63299822A - Composite die for drawing and piercing - Google Patents

Abstract

PURPOSE:To simultaneously execute deep drawing and piercing by one die by providing a 2nd drawing die on the base of a lower die, a 1st drawing die at the center and fixing a piercing die to the base at the center of the 1st drawing die. CONSTITUTION:When a work P is mounted on the upper face of a lower die 9 and an upper die 1 is descended, the pressure of pressing the work P is generated on a 2nd drawing punch 6 and 1st drawing die 11. Simultaneously therewith the pressure of the work P pressing is generated by a pressing plate 8 and the 2nd drawing die 13. When the upper die 1 is further descended, the curving part of the work P is formed by the projecting part of the 1st drawing punch 2 and the recessed part of the 1st drawing die 11. With further descent of the upper die 1, the inclined part of the work P is formed by the 2nd drawing punch 6, 1st drawing die 11 and 2nd drawing die 13 and the piercing of the work P is performed by the piercing punch 12 fixed to the lower die 9 base.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention performs deep drawing, drilling, etc., which require a large number of processes, in a small number of processing steps in the press working of sheet metal. This relates to a composite mold that can be used for processing automobile brake booster bodies, etc.

(Prior art) When performing deep drawing and drilling in sheet metal press working, as shown in Figure 6, (a) first drawing, (b)
The second drawing and (c) hole forming are processed by a pressing process.

(Problems to be solved by the invention) However, the conventional press working requires multiple steps for deep drawing and hole drilling, and also requires one mold for each step. Since the number of molds is required for each process, the number of molds inevitably increases, leading to problems such as an increase in mold costs and an increase in the number of press machines.

The present invention is a composite mold technology that can perform deep drawing and drilling with one mold, without requiring multiple molds when performing deep drawing and drilling of sheet metal rather than press working. This is a major issue.

[Structure of the invention]

(Means for solving the problems) The following measures were taken to solve the above technical problems. That is, in the mold shown in FIG. 1 which consists of an upper die and a lower die for processing a sheet metal, a first aperture with a convex tip is formed on the outer frame 1a of the upper die 1. The drawing punch 2 is fixed, and a knock pin 4 for scrap removal is attached to the center of the first drawing punch via a spring 3 for punching and scrap removal.
A second drawing punch 6 is provided via the first drawing punch plate holding spring 5, and a plate presser 8 engaged with the second drawing punch plate holding spring 7 is provided, and the plate presser 8 is attached to the outer frame 1a. A second drawing die 13 is fixed on the lower mold base 9a of the lower mold 9, a spring 10 for holding down the first drawing plate is provided, and a first drawing die 11 with a concave upper surface is provided in the center. , the first drawing die 11 has a hole in the center, and a punch 12 is fixed to the lower die base 9a.

(Operation) The technical means operates as follows. In other words, place the disc material on the upper surface of the lower mold fi5! Place the upper mold down and the second
The pressure of the workpiece holder is generated in the drawing punch and the first drawing die, and the pressure of the workpiece holder is also generated by the presser plate and the second drawing die, and when the upper mold is further lowered, the convex part of the first drawing punch and the first A curved part of the workpiece is formed by the concave part of the drawing die, and when the upper die is further lowered, the second drawing punch and the first
A slanted part of the workpiece is formed by a drawing die and a second drawing die, and a hole is made in the center of the workpiece by a hole punch fixed to the lower die base.

When the upper die rises, the workpiece also separates from the surface of the second drawing die due to the rise of the first drawing die, completing drawing and drilling of the workpiece.

(Example) This will be explained below using examples.

FIG. 1 shows a mold consisting of an upper mold 1 and a lower mold 9, and P is a workpiece made of a thin steel plate.

Reference numeral 2 denotes a first drawing punch fixed to the upper mold l, into which a spring 3 for punching and removing scraps and a knock pin 4 for removing scraps are inserted, and 5 a first drawing punch plate holder. The spring engages the second drawing punch 6, and the 7
is a spring for holding down the second drawing punch plate, and 8 is a holding plate.

A lower die 9 has a lower die base 9a, a first drawing die 11 is provided in the center, and a first drawing plate pressing spring 10 is provided. Reference numeral 12 denotes a mold in which a hole provided in the first drawing die is fixed to the center of the lower die base 9a by a punch and has a recessed part in the upper part, and a second drawing die 13 is fixed to the lower die base 9a. It is a structure.

Next, the functions of each part of the mold will be explained: (1) The first drawing punch 2 has the function of a punch for the first drawing and the hole has the function of a die, (2) The second drawing punch 6 has the function of a die. (3) The first drawing die 11 has the functions of a punch for the second drawing and a plate presser for the first drawing.
(4) The second drawing die 13 has the function of a second drawing die and a second drawing plate.

Next, the functions of the mold described above are as follows: (1)
In the preparation process, a workpiece P is placed between the upper mold 1 and the lower mold 9. In this case, the press is at top dead center (Figure 1).

(2) In the holding process, the upper die 1 is lowered, pressure is generated between the second drawing punch 6 and the first drawing die 11 as shown in A, and pressure is generated between the holding plate 8 and the second drawing die 13 at B. As shown, plate holding pressure is generated (Fig. 2).

(3) In the first drawing process, the upper mold 1 further descends.

The plate holder between the second drawing punch 6 and the first drawing die 11 is strongly pressed by the spring force, and the first drawing punch 2 is lowered and the first drawing die 11 is pressed down.
Perform aperture lowering C. In this case, the first drawing die 11 does not move because the spring 10 is strong (FIG. 3).

(4) In the second drawing process, the upper mold 1 further descends.

The plate press between the second drawing punch 6 and the second drawing die 13 is made strong by the spring force, and the second drawing punch 6 is connected to the upper mold outer frame 1.
The second aperture D is formed by pressurizing the outer frame of the upper mold while being in close contact with the mold.

Simultaneously with the completion of the second drawing forming, a hole is made in the center portion E using the punch 12 (FIG. 4).

(5) In the rising process, the upper mold 1 rises to the top dead center.

The center hole scrap 14 is taken out of the mold by the knockout pin 12 and the molding is completed.

Furthermore, the descending workpiece P can also be easily taken out by the second drawing die 11 (FIG. 5).

〔Effect of the invention〕

The present invention has the following effects. In other words, the above-mentioned composite mold has three pressing functions in one mold, and three processes can be lowered simultaneously in one shot, and by reducing the number of molds, it is possible to reduce mold costs, man-hours, and processing time. Furthermore, the space can be reduced by reducing the number of presses.

[Brief explanation of drawings]

Figures 1 to 5 are cross-sectional views for explaining each process in this embodiment. Figure 1 is the preparation process, Figure 2 is the pressing process, and Figure 3 is the first stage.
The drawing process, FIG. 4 shows the second drawing process, and FIG. 5 shows the raising process, and FIGS. 6A to 6C are explanatory diagrams of the conventional construction method. l... Upper die, 2... First drawing punch. 4... Dowel pin, 6... Second squeeze punch. 8... Pressing plate, 9... Lower mold. 11...First drawing die. 12... Anaaki punches. 13...Second drawing die.

Claims (1)

[Claims] In a composite mold consisting of an upper die and a lower die for drawing and drilling, a first drawing punch with a convex tip is fixed at the center of the outer frame of the upper die,
A dowel pin and a punching scrap spring are inserted into the central through hole, and a second drawing punch is slidably inserted outside the first drawing punch.
A drawing punch is provided, a spring for pressing the flat plate is arranged, and the second
A presser plate is slidably inserted into the outside of the drawing punch and the inner surface of the outer frame, a flat plate presser spring is arranged, a second drawing die is fixed to the lower base of the lower die, and a first die with a concave upper surface is installed in the center. A composite mold for drawing and punching, in which a drawing die is slidably inserted, a hole punch is provided in the center, the lower end is fixed to a lower mold base, and a plate holding spring is arranged on the first drawing die.