JPS595459Y2 - press punching device - Google Patents

Description

[Detailed Description of the Invention] The present invention mainly relates to an apparatus for punching a workpiece made of a relatively thick metal plate using a punch.

Conventionally, in this type of press working, for example, as shown in the first diagram, first punched holes are formed in a workpiece made of a metal plate at appropriate intervals, and then first punched holes are formed in this at appropriate intervals as shown in the second diagram. A method is known in which the second perforation hole C is formed in the second perforation, but such a method has the following disadvantages, especially in the case of the second perforation hole C.

That is, this machining state is as shown in the cross section in FIG. 3, for example, where the workpiece a is held between the lower die d and the upper die e, and the middle part is punched with the punch h, leaving both side parts g9g relatively narrow. A punched hole C is formed, but in this case each side part g tends to escape outward and twist inward as shown by the arrow, which tends to cause product defects due to deformation.

To be more specific, this tendency is remarkable when the workpiece a is relatively thick and each side g is relatively narrow. For example, the wall thickness is t and the width of the side g is W. When W/l is 1
This is significant in the neighborhood, so it is necessary to make this a two-neighborhood,
According to this, it is a win with an increase in man-hours, etc.

The purpose of the present invention is to obtain a device free of such inconveniences, and a workpiece 1 made of a metal plate is held between a lower die 2 and an upper die 3, and both sides 4° 4 are relatively narrow. In a press punching device in which a middle punching hole 6 is formed with a punch 5 while leaving the same width, the both side parts 4, 4 are placed on either side of the opposing surfaces of the lower die 2 and the upper die 3 on the outside of the body. A pair of left and right step portions 7, 7 are formed to support the workpiece 1 from the upper die 2 and the lower die 3 by making the depth of the step portions 7, 7 shallower than the thickness of the workpiece 1. It is characterized in that a gap is formed between the opposing surfaces of the upper mold 2 and the lower mold 3 when the upper mold 2 and the lower mold 3 are held together.

FIG. 4 shows an example of this.
Although the step portions 7 are formed in one pair on the left and right, the present invention is not limited to this, and it is also possible to arrange the step portions 7 in a pair on the left and right on the lower surface of the upper mold 3, for example, as shown in FIG.

To explain its operation, during the punching process, the side parts 4, 4 tend to escape to the outside of the body and twist inward as described above, but at this time, the step parts 7, 7 on the outside of the body tend to twist. It is held from the outside of the torso, so there is no deformation as described above.

2, when the present invention is used, both sides 4, 4 of the workpiece 1 are used.
In a press punching device in which an intermediate punching hole 6 is formed by a punch 5 while leaving a relatively narrow width, narrow side portions 4 are formed on either side of the opposing surfaces of the upper die 2 and the lower die 3. ，
A pair of left and right stepped portions 7, 7 are formed to support 4 from the outside of the body, and the depth thereof is made shallower than the thickness of the work 1, with the work 1 being held between the upper mold 2 and the lower mold 3. Since a gap is formed between the opposing surfaces of the upper mold 2 and the lower mold 3, the width of both sides 4, 4 is narrow because the upper and lower surfaces of the upper and lower molds are only firmly held by the upper mold and the lower mold. Also, its outer surface also has stepped portions 7, 7.
Since it is held more firmly, it is possible to prevent the both sides 4, 4 from being twisted when forming the punched hole 6 in the middle, thereby allowing accurate punching.

[Brief explanation of the drawing]

Figures 1 and 2 are plan views of a workpiece explaining a conventional example;
FIG. 3 is a cross-sectional view of the main parts of the device in an operating state, FIG. 4 is a cross-sectional view of an example of the device according to the present invention in an operating state, and FIG. 5 is a cross-sectional view of a modification thereof. 1...Work, 2...Lower die, 3...
...Top mold, 4,4...Both sides, 5...
・Punch, 6...Punching hole, 7,7...
Danbe.

Claims (1)

[Scope of utility model registration request] A workpiece 1 made of a metal plate is held between a lower mold 2 and an upper mold 3, and a punch 5 is inserted into the workpiece 1, leaving both sides 4, 4 relatively narrow.
In a press punching device for forming an intermediate punching hole 6, a pair of left and right sides are provided that support the both sides 4, 4 from the outside of the body on either one of the opposing surfaces of the lower mold 2 and the upper mold 3. Step portions 7, 7 are formed, and the depth of the step portions 7, 7 is made shallower than the thickness of the work 1, and the work 1 is held between the upper die 2 and the lower die 3. A press punching device characterized in that a gap is formed on opposing surfaces of an upper die 2 and a lower die 3.