JPH03247Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Field of Use This invention relates to a press die for performing so-called shearing operations such as cutting operations such as blanking and piercing operations.

BACKGROUND TECHNOLOGY FIG. 7 shows a form of piercing hole processing as one of the shearing processes. As is well known, this is the lower mold 1
A button die 2 is attached to the upper die 3, a piercing punch 5 is attached to the upper die 3 via a punch retainer 4, and a pad 7 is elastically supported via an elastic body 6 such as a coil spring.

Then, as shown in FIG. 8, as the upper die 3 descends, the lower die 1 and pad 7 press and hold the panel work W, and further compresses the elastic body 6 while the upper die 3 descends. Then, the earring punch 5 and button die 2 will engage with each other. As a result, the piercing hole is formed by the shearing action between the cutting edge 5a of the piercing punch 5 and the cutting edge 2a of the button die 2. S
is the scrap caused by the piercing process.

In this case, a clearance C is essential between the piercing punch 5 and the button die 2, and this clearance C is usually directly linked to the occurrence of sagging and burrs on the shear surface Sh of the panel work W. is strictly controlled.

Problems to be Solved by the Invention However, the cutting edges 2a and 5a of the button die 2 and the piercing punch 5 wear out with use, so even if strict clearance control is performed as described above, the shear surface Sh remains Burr B occurs.

For this reason, especially in the case of a workpiece to be painted in a subsequent process, since the burr B has an acute edge shape, it is difficult for the paint film to adhere to the workpiece, which causes rust to occur.

On the other hand, in the case of a workpiece in which no burrs are allowed to be generated, a separate deburring process is carried out in a subsequent process, but this is not preferable as it increases the number of processing steps.

The present invention allows for the generation of burrs, which is a special feature of shearing, and provides a press die that can be used to remove burrs in addition to shearing during cutting such as blanking and piercing holes. That is.

Means for Solving the Problems In the present invention, at least near the edge of the cutting edge on the die side, a protruding hill portion is formed that presses the vicinity of the sheared surface of the workpiece in cooperation with the pad, while
A burr receiving recess is formed on the opposite side of the shearing cutting blade at the tip of the land by sandwiching the land part of the punch, and the ridge line formed by the burr receiving recess and the land part is used as the burr removing cutting blade. Features.

The shearing process referred to here includes cutting processes such as blanking, piercing hole processing, and all shearing processes included in press working.

That is, in the present invention, as shown in FIG. 1, for example, a burr receiving recess 12 and a deburring cutting edge 13 are formed above a land portion 11 of a punch 10 that moves up and down. On the other hand, a hill portion 17 that projects upward is formed at the peripheral edge of the cutting blade 16 on the die 15 side.

Action As is clear from the above configuration, when the punch 10 descends, the workpiece W is sheared by the shearing action between the shearing cutting blade 14 on the punch 10 side and the cutting blade 16 on the die 15 side, as in the conventional case. Ru. At this time, the pad 18 and the hill portion 17 work together to apply pressure near the sheared surface, so that the burr B produced by shearing protrudes toward the burr receiving recess 12 side. Therefore, as the punch 10 moves upward, the burr B is scraped off by the cooperation of the deburring cutting blade 13 and the edge portion of the pad 18.

Embodiment FIG. 2 is a diagram showing a first embodiment of the present invention, and illustrates a press die for piercing holes.
However, the same parts as in FIG. 7 are given the same reference numerals.

As shown in FIG. 2, at the peripheral edge of the cutting edge 26 of the button die 25 attached to the lower die 1, a hill portion 27 having a trapezoidal cross section and projecting upward is formed.

On the other hand, a sectional pad 28a corresponding to the hill portion 27 is attached to the pad 28 in order to press the processed part of the panel work W with high accuracy, and furthermore, the clearance between the pad 28 and the piercing punch 20 is adjusted to the width of the passage. Air passage 29a included in part,
29b is formed.

Additionally, a circumferential groove-shaped burr receiving recess 22 is formed above the shearing cutting blade 24 at the tip of the piercing punch 20, and as shown in FIG. Horizontal part 2
The ridge line formed by the land portion 21 and the deburring cutting edge 23 is formed by the ridge line portion 2a and the land portion 21. That is, a shearing cutting blade 24 and a deburring cutting blade 23 are formed above and below the land portion 21, sandwiching it therebetween.

The press die constructed in this manner operates as follows in FIGS. 3 and 4.

As the upper die 3 descends, the pad 28 including the sectional pad 28a and the lower die 1 press and hold the panel work W, and as the upper die 3 further descends, the shearing cut on the piercing punch 20 side is made. It is the same as the conventional method until the piercing hole is formed by the shearing action between the blade 24 and the cutting edge 26 on the button die 25 side.

At this time, the sexual pad 28a and the hill part 2
Due to the pressing force with 7, the shear surface of the panel work W
Press the periphery of Sh as if it were coining. As a result, the peripheral edge of the sheared surface is plastically deformed as shown in FIG. 3, and under the stress thereof, the burr B produced during the previous shearing protrudes toward the burr receiving recess 22 side. In this case, the deburring cutting blade 23
must be located below the cutting edge 26 on the button die 25 side and below the tip of the burr B.

Next, when the upper mold 3 reaches the bottom dead center, the upper mold 3 rises again together with the piercing punch 20, as shown in FIG. At this time, since the burr B generated on the sheared surface Sh protrudes toward the burr receiving recess 22 side as described above (Fig. 3), this burr B has sex with the deburring cutting blade 23 of the piercing punch 20 that is rising. It is scraped off by shearing action with the edge portion 28b of the lateral pad 28a.

Although the scraped burr B ₁ is temporarily accommodated in the burr receiving recess 22, as shown in FIG. When they match, the burr _B1 accommodated in the burr receiving recess 22 is blown away toward the air passage 29b.

FIG. 5 is a diagram showing a second embodiment of the present invention. In this embodiment, the sectional pad 28a corresponds to the hill portion 27 on the button die 25 side.
A hill portion 37 is also formed protruding from the side.

In the case of this embodiment, since printing pressure is applied from both the upper and lower directions, the amount of plastic deformation is large, and the amount of burr B that protrudes toward the burr receiving recess 22 side increases with the deformation stress. becomes even easier to obtain.

FIG. 6 shows a third embodiment of the present invention, which is applied to a cutting die for blanking in place of the previously described die for piercing holes.

As shown in FIG. 6, a hill portion 47 is formed near the cutting edge 36 of the lower blade 35 as a die;
A sectional pad 28a is provided on the pad 28 side. Further, a burr receiving recess 32 is formed in the upper blade 40 as a punch, and a land portion 31 is formed.
A shearing cutting blade 34 and a deburring cutting blade 33 are formed above and below the .

In the case of this embodiment as well, when the upper mold 1 descends, the shearing cutting blade 34 and the cutting blade 35 on the lower blade 35 side
The panel work W will be cut due to the shearing action. After that, when the upper mold 1 is raised, the deburring cutting blade 33 and the sectional pad 28 are removed.
Due to the shearing action of a with the edge portion 28b, the burr B generated on the sheared surface is scraped off. Since compressed air is blown from the air passage 29a, the burrs accommodated in the burr receiving recess 32 are removed.
B ₁ will be blown out of the mold.

Effects of the invention As described above, according to the invention, the burr generated on the sheared surface can be removed by the deburring cutting blade formed on the punch along with the shearing cutting blade immediately after shearing, so that the burr generated on the sheared surface can be removed. There is no need to perform deburring processing, and even when sheared workpieces are painted, there are no problems such as difficulty in adhering the paint film, and the cause of rust can be eliminated.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the main parts showing the outline of the present invention, Figure 2
The figure is a sectional view showing the first embodiment of the present invention, FIGS. 3 and 4 are sectional views showing the operation of FIG. 2, and FIG.
The figure is a cross-sectional view showing a second embodiment of the present invention, Figure 6 is a cross-sectional view showing a third embodiment of the present invention, and Figures 7 and 8 are cross-sectional views of a conventional press die. . 10... Punch, 11, 21, 31... Land portion, 12, 22, 32... Burr receiving recess, 13,
23, 33...Deburring cutting blade, 14, 24, 3
4... Cutting blade for shearing, 15... Die, 16,2
6, 36... Cutting blade, 17, 27, 37, 47...
Hill portion, 18, 28... Padded, 20... Earring punch as a punch, 25... Button die as a die, 35... Lower blade as a die, 40...
Upper blade as a punch, W...panel work, Sh
...Sheared surface, B, B ₁ ...Burr.

Claims (1)

[Scope of utility model registration request] After pressing the workpiece with the die and pad,
In a press die that performs shear processing on a workpiece by the shearing action between the cutting edge on the die side and the cutting edge on the punch side based on the relative movement between the die and the punch, there is a gap between the pad and the cutting edge at least near the edge of the cutting edge on the die side. By working together, a protruding hill part is formed that presses the vicinity of the sheared surface of the workpiece, while a burr receiving recess is formed on the opposite side of the shearing cutting edge at the tip of the land part by sandwiching the land part of the punch, and this burr receiving recess is formed on the opposite side of the shearing cutting edge at the tip of the land part. A shearing press type characterized by using the ridge line between the recess and the land as a cutting edge for deburring.