JPS58112614A - Press die - Google Patents

Abstract

PURPOSE:To obtain a press die made it possible to reduce working man-hours and the time reguired for arrangement, by forming a die by connecting a bending part and a cutting part to a die cooperating with a punch, and performing a piercing and a burring by one stage of the punch. CONSTITUTION:The tip corners 11a of a punch 11 are radiused; and a bending part 13 for forming a flange, having a clearance approximately equal to the thickness of a flat plate work 9 between it and the punch 11, and a cutting part 14 of which clearance is smaller than the thickness of the work 9, are provided to a button die 12. When the work 9 is put on a lower die 1 and an upper die is made to descend, a pad 5 presses the work 9 against the die 1 by a spring force of a spring 6, and then, the punch 11 descends toward a hole of the button die 12, and stretches the work 9 to form a flange 15 by the bending part 13 of the die 12, and descends further to punch a hole by the cutting part 14.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a press mold used for piercing and drilling.

Conventionally, a hole is pre-drilled in a flat plate workpiece, and a punch with a diameter larger than the inner diameter of the hole is pushed into the hole to form a 7-lunge on the inner periphery of the hole. As shown in the figure, a button die 2 constituting one side of the press machine is attached to the lower mold l, a punch 8 constituting the other part of the press die is attached to the upper die 4 facing the button die 2, and a pad 6 is attached to the upper die 4. A press attached to upper #14 via spring 6 is used.

The press die of the press machine shown in 81m is used exclusively for piercing, and the punch δ has an outer diameter approximately equal to the inner diameter of the die hole of the methane die 2, and a cutting edge 8 is provided at the outer end of the tip. ing.

The press die of the press machine shown in Fig. 2 is used exclusively for burring after the piercing process by the press machine shown in Fig. 1.
The punch 8' has a diameter larger than the inner diameter of the hole 10 (see Figure 1) drilled in the flat plate work 9 by piercing, and has an R1 or tapered tip 8'a; The inner diameter of the die hole 7' of the cooperating button die 21 is evacuated so that a clearance approximately equal to the flat plate warp 19 (D & Jl) is created between it and the outer peripheral surface of the punch 8'.

However, with such conventional press molds,
Separate press molds are used for the via forming process and the burring process, and molding is performed in two processes, resulting in a large number of processing steps, high mold manufacturing costs, and a long setup time during production. there were.

The present invention has been made by forming layers at the same point in the prior art, and includes a die that presses a workpiece in cooperation with a press-type punch so that piercing and burring can be performed in the first step. Another object of the present invention is to solve the above-mentioned problems by forming a bending section whose clearance with the punch is approximately equal to the thickness of the workpiece, and a cutting section whose clearance is smaller than the thickness of the workpiece.

Hereinafter, the present invention will be explained based on the drawings.

FIG. 8 is a diagram showing an embodiment of the present invention.

First, #l configuration - To explain, the l which cooperates with the punch 11
7-lunge bending process in which the clearance between the tan die 12 and the punch 11 is approximately the thickness of the flat plate work 9! /6
18, and the cut r# part 1 which is smaller than the plate thickness of the flat plate work 9
4, and the tip 11a of the punch 11 is rounded or chamfered.

With this configuration, during press working, a flat plate workpiece 9 such as a drawbar half just before the lower mold l can be attached to the lower mold l.
When the upper die is filled, the pad 5 first presses the work 9 against the lower die 1, and as the upper die 4 further descends, the spring 6 is bent and the punch 11 is inserted into the button die hole. The workpiece 9 is lowered while stretching the workpiece 9, and after the workpiece 9 is formed with seven flange 16 along the bending part 18 of the button die 2, the workpiece 9 is moved 11s between the cutting part 14 of the button die 2 and the outer periphery of the punch 11. A hole is made by. Next, the upper model number rises, the punch 11 comes out of the button die hole, and the spring 6, which had been bent during this time, is returned to its original position.
As the upper die further rises, the pad b is pressed against the workpiece 9 and press processing is performed.

4 to 6 show other embodiments of the invention.

In this example, the button die 12 attached to the lower die 1 is provided with a bending process 1118 and a cutting portion 14 in the button die hole #1III, similar to the above-described example.

On the other hand, the punch 11 has a small-diameter tip cutting edge 17 for making a pilot hole, a sloping portion 18 for pushing and enlarging the hole drilled by the tip cutting edge 17, and this slanted portion. A scrap cutting blade 19 formed by a section provided between the bunch body and the bunch body is provided.

When performing piercing and purring using the press die of the #I2 example, place the flat plate work 9 on the die L as shown in FIG. ) is lowered, and after the pad 5 presses the flat plate work 9 onto the die L, the upper die further descends, and the tip cutting edge 17 of the Lee punch 11 makes a pilot hole in the flat plate work 9.
After expanding this pilot hole with punch #-g18, a seven flange 15 is formed at one edge of the hole by the bunch body portion and the bent portion 13 of the button die 12, as shown in FIG. 7 lunge 1 by the cutting part 14 and the outside of the punch 11 Ill lj [i 'E w, -
Completely cut off the toe hole waste 2θ from the light leakage in step 6.

As explained above, according to the unexploded uA, the bending part and the cutting edge part are bent on the inner I# wall of the button die hole.
By selecting III, the effect that piercing and burle processing can be performed with I1 can be obtained.

In addition, whereas conventional press molds with 2,111 barbs are required, only one press mold is required, reducing the number of man-hours for assembling the press mold and other setups. The workpiece is #formed during the burring process.
This method has the advantage of eliminating the workpiece positioning required in the burring process when the burring process is performed.

[Brief explanation of drawings]

Figure #11 is a cross-sectional view of the press machine equipped with a conventional piercing device. Figure 2 is a vertical cross-sectional view similar to Figure 1 of a press machine equipped with a conventional burring press 1, and Figure #18 is a vertical cross-sectional view similar to Figure 1 of a press machine equipped with a press die according to the present invention. , FIG. 4 is a schematic partial vertical view of a press mold showing another embodiment of the present invention. , FIG. 6 is an explanatory diagram of the molding process using the Bonapress die shown in FIG. 4. l...upper mold, 4...upper mold, 6.
...Pad, 6...Spring, 9...
・Flat plate work, 11... Punch, 12...
Button die, 18...7 bending part for forming a flange, 14...cut #
Part, lla...punch tip, 15...7
Lunge, 17...Tip cutting edge part, 18...#
Oblique part, 19... Scrap cutting blade. Patent Applicant L:L production automatic 4 taste ceremony participation company Figure 5 Figure 6

Claims (1)

[Scope of Claims] L Bending process 1: in which the workpiece is not pressed in cooperation with the punch and the clearance with the punch is approximately equal to the thickness of the workpiece, and cutting is made smaller than the thickness of the workpiece. A press mold characterized by forming a part. 2- Claim 1, wherein the punch has a cutting step between the piercing part and the punch body.
The press mold described in section.