JPH04197533A - Press die - Google Patents

Abstract

PURPOSE:To make the stroke of pad small and to improve the strength of die by setting the cut pad which restricts the work for cut-treating both ends of the work and the restriking pad which restricts the work for restriking the work. CONSTITUTION:The punch 1 for positioning and mounting the work W is set on the press die which executes the cut treatment for cutting and removing both end parts of longitudinal direction of the work W formed U letter like sectional area, and, at the same time, the restriking working to both side surfaces of the work W to finish the shape of the work W more exactly. The cutting die 5, 5 which is fixed on the upper holder 3, and cuts and removes the both end parts of longitudinal direction of the work W co-operating with the punch 1, and the cut pad 7 which is supported elastically with the upper holder 3, and pressurizes and restricts the work W in advancing to the cut treatment are provided. The restriking die 6 which is fixed on the upper older 3 and executes restriking working to the both side surfaces of the work W, and the restriking pad which pressurizes and resticts the work W in advancing to the cut pad are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a cutting process for cutting and removing both longitudinal ends of a workpiece that has been drawn into a U-shaped cross section in a previous process, and for improving the shape of the workpiece. It relates to the structure of a press die that simultaneously performs restrike processing (dimension processing) on both sides of a workpiece for accurate finishing.

BACKGROUND OF THE INVENTION In conventional techniques, for example, side members and cross members of automobiles, the manufacturing procedure is to draw the entire workpiece into a U-shaped cross section, and then cut and remove both longitudinal ends of the workpiece in a cutting process.

More specifically, as shown in FIGS. 5 and 6, a workpiece W formed into a U-shaped cross section in the previous process is placed on a punch 31, and while the workpiece W is pressurized and restrained by the punch 31 and the pad 32. , both longitudinal ends of the workpiece W are cut off as scraps S by the shearing action based on the cooperation between the punch 31 and the cut die 33. 34 is an upper holder, and 35 is an elastic body such as urethane rubber interposed between the upper holder 34 and the pad 32.

On the other hand, during the above cant processing, a restriking process may be simultaneously performed as a dimensioning process to more accurately finish the shape of the workpiece W. In this method, as shown in FIGS. 7 and 8, a restriking die 44 is provided on the upper holder 41 in addition to a cut die 42 and a pad 43.
Both ends of the workpiece W are cut and removed using the punch 45 and the cut die 42 while the workpiece W is pressurized and restrained by the punch 45 and the pad 43, while both sides of the workpiece W are pressurized by the punch 45 and the restrike die 44. By restraining it, the dimensions of both sides are determined.

Note that, as shown in FIGS. 7 and 8, when cutting and striking processing are performed on both ends of the workpiece W at the same time, the pressing force and stroke of the pad 43 will increase, so the pressing force on the pad 43 will be increased. A slide 7 knockout device (upper knockout device) is used as the applying means, and the knockout force of this slide knockout device is transmitted to the pad 43 through the knockout bar 46, as well as the pressure plate 47 and the knockout pin 48. 49 is a press slide.

Problems to be Solved by the Invention As shown in FIGS. 7 and 8, in a composite press mold structure that performs cutting processing and strike processing at the same time, the punch 45 and cutting die 4 are
The punch 45 and the restriking die 4 were used much earlier than the cutting process of the scrap S due to the shearing action with the punch 45 and the restriking die 4.
4, the pad 43 is already in the workpiece by the time the restriking starts.
As a result, the stroke ST of the cutting blade 43 becomes significantly larger than that of the cut processing only type shown in FIGS. 5 and 6.

In the case of the press die shown in Fig. 7, the die-hide DH must be at least twice the stroke ST of the pad 43, so the stroke ST of the pad 43 is
When the stroke ST of 3 becomes large, Die Hyde DH,
There is a problem that the strength of the mold decreases as the shape becomes extremely stiff.

The present invention was made in view of the above problems.
The purpose is to provide a mold structure that can suppress die hide to the same extent as a type that only performs cut processing, even though it is a type that performs simultaneous cutting and strike processing.

Means for Solving the Problems The press mold of the present invention has a cutting process that cuts and removes both longitudinal ends of a workpiece that has been previously formed into a U-shaped cross section, and a cutting process that cuts and removes both longitudinal ends of a workpiece that has been previously formed into a U-shaped cross section. It has a press-type structure that performs restriking on a surface at the same time, and it has a punch on which the workpiece is positioned and placed, and is fixed to an upper holder, which cooperates with the punch to shear both ends of the workpiece in the longitudinal direction. with a cut die to cut and remove the
A cut pad is elastically supported by the upper holder so as to be able to move up and down, and pressurizes and restrains the workpiece together with the punch prior to cutting by the punch and cut die. The restriking die performs the restriking process on the workpiece, and is supported in a vertically movable manner by the quad pad and do, and a downward biasing force is applied by the slide knockout device, which applies the workpiece together with the punch in advance of the force, dopa, and do. It is equipped with pressure restraints and strike pads.

Operation - According to this structure, as the upper mold descends, the restriking pad presses and restrains the workpiece before the cut band, and in this state, the restriking process using the punch and strike die is started.

As the restriking process progresses, the restriking pad bottoms out against the cut pad, and together with the restriking pad, the cut pad pressurizes and restrains the workpiece. Eventually, the punch and cut die perform the cutting process. will be applied.

Embodiment FIGS. 1 and 2 are diagrams showing an embodiment of the present invention.
3 is a punch fixed to a lower holder 2, 3 is an upper holder, and 4 is a press slide. In addition to a pair of cutting dies 5 for cutting, a pair of restriking dies 6 for restriking are each fixed to the upper holder 4.

Further, a cut pad 7 is arranged in a space surrounded by a pair of cut dies 5 and a restrike die 6 so as to face the punch 1. Cut pad 7 has upper holder 3
A downward biasing force is applied by an elastic body 8 such as a urethane comb interposed between , (ST, -(, +α)).

In the receiving space 9 formed in the center of the dopant pad 7, there is a strike pad 7 that is separate and independent from the cut pad 7.
O is provided. A brainer plate 12 is integrally connected to the upper surface of the restrike pad 10 via a knockout bin 11 passing through the cut pad 7, and the upper surface of the restrike pad 10 has a receiving space 9.
The pressure plate 12 is placed on the cut pad 7 under a stroke ST3 between the position where the pressure plate 12 is seated on the inner bottom of the cut pad (the state shown in Fig. 1) and the position where the pressure plate 12 is seated on the upper surface of the cut pad 7 (the state shown in Fig. 3). It is possible to move up and down.

A seven-sock-out par 13 of a slide knockout device provided on the press slide (ram) 4 is in contact with the pressure plate 12, thereby applying a downward biasing force to the restrike pad 10.

In the press mold structure constructed in this way, when the workpiece W, which has been previously drawn into a U-shaped cross section in the previous step, is positioned on the punch 1 as shown in FIG. 3, and the upper mold is lowered, First, the restriking pad 10 contacts the workpiece W, and the punch 1 and the restriking pad 10 punch the workpiece W.
be restrained under pressure.

When the upper mold is further lowered in this state, the pair of restrike dies 6 engage with the punch 1, as shown in FIG. Glue strike processing begins on both sides.

At this stage, the restrike pad 10 only moves upward relative to the cut pad 7 against the knockout force of the knockout bar 13, and the cut pad 7 moves upward against the elastic body 8.
Due to the urging force of , it continues to descend together with the cutting die 5.

As the upper die continues to descend and the restriking process progresses,
As shown in FIG. 4, the cut pad 7 comes into contact with the workpiece W, and the restrike pad 10 is seated against the receiving space 9 of the cut pad 7, resulting in a so-called bottoming state. 7tori strike bad 10
are essentially one and the same.

When the upper mold is still lowered from the state shown in FIG. 4, the cutting die 5 and punch 1 engage for the first time as shown in FIGS. It is cut and removed as S.

Here, in the upper mold bottom dead center state in FIG. 1, the dimension ST between the force 7 and the pressure plate 12 is a dimension corresponding to the conventional stroke ST shown in FIG. Since the dimension ST includes the stroke ST of the cut pad 7, ST=STt-3T.

Therefore, the dimension ST is significantly smaller than the conventional stroke ST. As a result, conventionally, die-hyde DH
, and the stroke ST, was required to be more than twice as long as the stroke ST, but in the present embodiment, the dyno \i) DH3 becomes DH3=ST3+ST, +α, and can be reduced to about 1/2 of the conventional one.

Effects of the Invention As described above, according to the present invention, by making the cut pad for cut processing and the glue strike pad for strike processing independent from each other, the total stroke of the pad that affects die hide can be reduced compared to the conventional method. As a result, the die-hydride becomes significantly smaller and the mold strength improves.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, with the upper mold in the bottom dead center state, FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1, and FIG.
Figure 4 is a sectional view showing the strike pad in contact with the workpiece, Figure 4 is a sectional view showing the cut pad in contact with the workpiece, Figure 5 is a sectional view of a conventional press mold for cutting processing, Figure 6 is a cross-sectional view taken along the line B-B in Figure 5, Figure 7 is a cross-sectional view of a conventional press die that performs cutting and strike processing at the same time, and Figure 8 is a cross-sectional view taken along the line C-C in Figure 7. FIG. l...Punch, 3...Upper holder, 4...Press slide, 5...Cut die, 6...Restrike die, 7...Cut pad, 8...Elastic body, IO・・
- Wrist strike pad, 12-pressure plate, 13-knockout bar, W...work. Figure 3: 41! I

Claims (1)

[Claims] (1) A press that simultaneously performs a cutting process that cuts and removes both longitudinal ends of a workpiece that has been previously formed into a U-shaped cross section, and a restriking process that performs a restriking process on both sides of the workpiece to more accurately finish the shape of the workpiece. The structure of the mold includes a punch for positioning and placing the workpiece, a cutting die that is fixed to the upper holder and cuts and removes both longitudinal ends of the workpiece by the shearing action of the punch, and upper and lower ends of the upper holder. A cut pad that is movably elastically supported and pressurizes and restrains the workpiece together with the punch prior to cutting by the punch and cut die, and a cut pad that is fixed to the upper holder and works with the punch to perform restrike processing on both sides of the workpiece. A restriking die that is movably supported by the cutting pad and is applied a downward biasing force by a slide knockout device, and pressurizes and restrains the workpiece together with the punch in advance of the cutting pad. A press mold with the following features.