JPH06254630A - Punching punch - Google Patents

Abstract

PURPOSE:To cut down a circular-arculate fragment in a pipe and also to hold down a square fragment in the pipe by forming a cutting-off edge by the line of intersection of the circular-arculate cutting-off surface and a square hold-down surface. CONSTITUTION:A cutting edge part 3 is formed into a U-shape with a circular- arculate part 4 which is slightly smaller than the inside diameter of the pipe P, side faces 5 on its right and left sides and a bottom surface 6 and an edge part 7 is formed at the tip. A slope is formed from the side of the circular- arculate part 4 toward the bottom part 6 in this edge part 7 and the circular- arculate cutting-off surface 8 and the hold-down surface 9 are formed by cutting the slope into retracting-angle shape. The cutting-off edge 10 is constituted of the hold-down surface 9 and the cutting-off surface 8. When the cutting edge part 3 is struck into the pipe P, the cut piece 15 is struck down in the pipe P and the fragment 14 is held down into a chevron in the pipe P with the hold-down surface 9 and the bottom surface 6. A wire is simply inserted into the pipe P through the formed inserting hole without being damaged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punch for punching a pipe having a relatively small diameter.

[0002]

2. Description of the Related Art Conventionally, for example, when a wiring insertion hole is formed in a pipe having a relatively small diameter which is used as a core material of a light control switch lever attached to a steering column of a vehicle and through which the wiring is inserted and arranged. The pipe was held horizontally and a punch was punched from a vertical position at a predetermined position to penetrate the insertion hole.When punching from this vertical direction, the punching material falls into the pipe and is taken out. It takes a lot of time and labor, and there is a problem that a burr is generated at the edge of the punching hole on the inner diameter side of the pipe to cause wiring and contact to cause a short circuit. The punch 21 shown has been developed so that the insertion hole H is provided therethrough.

This punch 21 is a pipe P held horizontally.
On the other hand, the punch 21 is driven by a press machine from an angle of about 45 degrees of a vertical plane including the axis of the pipe P toward the punching position, and the punch 21 has a substantially U-shaped cross section. As shown in the figure, the shape of the cutting edge is formed obliquely at an angle of about 45 degrees from the arc portion side. This inclined surface 22
The arcuate portion is formed on the cutting blade 23, and cutting blades 24 are formed on the left and right sides of the cutting blade 23. The inclined surface 22 has a predetermined width at the center thereof.
2, a pressing surface 25 is formed in a protruding shape at a predetermined angle, and a pressing surface 25 and a bent surface 26 that is inclined from a predetermined position at the tip of the arc portion toward the inclined base are formed to form a substantially triangular shape. A pressing convex portion 27 is formed so as to project inward. Further, a rake face 28 is attached to the left and right cutting blades 24.

When the punch 21 thus formed is attached to a press and driven into the pipe P from an angle of 45 degrees, it is first cut into an arc shape by the cutting blade 23, and the cutting blade 23 is further cut. The cutting blade 24 is cut by the continuous cutting blade 24 to be cut and raised in a substantially U-shape shown in the drawing.
The pressing surface 25 and the bending surface 26 are pressed into the inside of the housing in a substantially V shape, and an arcuate edge Ha and an insertion hole H having a long edge Hb parallel to both ends of the arcuate edge Ha are provided. .

[0005]

However, the electrification of vehicles has recently progressed, and therefore the number of wires inserted in the pipe P tends to increase, and the inner diameter of the pipe P is substantially increased. Can be inserted in a harness form, but the cut-and-raised piece 29 is pushed into the inner diameter portion in a substantially doglegged shape at the portion penetrating the insertion hole H, and the tip portion 30 of the cut-and-raised piece 29 is inserted. The inner diameter area is reduced, which makes insertion difficult, and even if insertion is possible, the tip portion 30
There is a problem that the wiring and the wiring may come into contact with each other to cause a short circuit.

The present invention has been made to solve the above-mentioned conventional problems, and it is possible to cut off the bent tip portion of the cut-and-raised piece formed when the insertion hole is penetrated in the conventional pipe. It is intended to provide a punch for punching.

[0007]

In order to solve the above technical problems, the present invention is a punch for punching a substantially U-shaped hole in a pipe, which is formed in a substantially U-shaped cross section by an arc portion, a side surface and a bottom surface. Further, the tip of the cutting edge portion is cut from the arc portion toward the bottom surface at a predetermined angle, and is cut from the joining portion of the arc portion and the side surface of the inclined surface toward the arc portion at a predetermined angle with respect to the inclined surface. To form a circular arc-shaped parting surface, a rectangular pressing surface, and a parting blade formed by the intersecting line of the two surfaces, and punching the punch into the pipe at a predetermined angle The punching punch has a structure in which the rectangular piece is cut off into the pipe, and the rectangular piece is pressed into the pipe to make a substantially U-shaped hole.

[0008]

With the above construction, by providing the cut-off surface in front of the cut-off blade, it is possible to cut off the front of the section for opening the insertion hole to obtain a wide inner diameter area.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. The punch 1 of this embodiment has a long edge H parallel to the conventional arc edge Ha and both ends of the arc edge Ha.
The punch 1 is intended for the insertion hole H having the position b, and the punch 1 is provided to the pipe P which is held horizontally and is directed toward the hole opening position.
It is driven by a pressing machine from an angle of about 45 degrees of a vertical plane including the axis line of.

This punch 1 comprises an implanting portion 2 attached to the press side and a cutting edge portion 3, which has a cross section similar to the conventional one, and is an arc having a diameter slightly smaller than the inner diameter of the pipe P. The portion 4 and the side surfaces 5 and the bottom surface 6 having a predetermined height on the left and right sides of the arc portion 4 are formed in a substantially U-shaped cross section, and a cutting edge portion 7 is formed on the tip end side.

The cutting edge portion 7 has a bottom portion 6 from the side of the arc portion 4.
The inclined surface C is formed by cutting the inclined surface C at a predetermined angle X, for example, 45 to 50 degrees. An arc-shaped cut-off surface 8 is formed by cutting at a receding angle at an angle Y, for example, 80 to 90 degrees, and the inclined surface C forms a pressing surface 9. The cutting edge formed by the pressing surface 9 and the cut-off surface 8 constitutes a cut-off blade 10, and the arc-shaped edge Ha of the insertion hole H is formed at the arc-shaped edge formed by the cut-off surface 8 and the arc portion 4. A circular arc cutting blade 11 for cutting the is formed.

Further, the left and right side surfaces 5 of the pressing surface 8 are inclined from the pressing surface 9 toward the left and right side surfaces 5 by a predetermined angle, for example, 13 to 13.
A relief surface 12 having a width of about 1 mm or less is formed in a receding angle at 18 degrees, and an insertion hole H is formed at an edge portion formed between the relief surface 12 and the side surface 5.
Long edge cutting blades 13 for cutting the long edge Hb are formed on the left and right sides of the.

Now, in FIG. 4, the punch 1 of this example is a pipe P.
The state set for is shown. That is,
The punch 1 attached to a press machine (not shown) is driven from the direction of about 45 ° to the pipe P by making the cutting edge 10 of the pipe P advance and the pressing surface 9 face each other. Is provided. Next, as shown in FIG. 5, the punch 1 is driven into the pipe P by a pressing machine, and first, the cut a shown in FIG. 6 is made in the pipe P by the cutting blade 10, and from both ends of the cut a. Similarly, the arc-shaped cutting blade 11 and the long-edge cutting blade 13 can be used to
The cuts b and c shown in are inserted.

Further, as shown in FIG. 7, when the arcuate cutting blade 11 has completely entered the pipe P, the cut pieces 15 by the cuts a and the cuts b are dropped into the pipe P. On the other hand, the section 14 formed by the cut a and the cut c is attached to the pipe P by the pressing surface 9 and the bottom surface 6.
It is pressed into the shape of a dogleg inside. At this time, the left and right relief surfaces 12 of the pressing surface 9 allow the punch 1 to penetrate deep into the pipe P without damaging the inside of the pipe P, and can effectively press the section 14. In this way, the punching of the substantially U-shaped cord insertion hole H is completed.

Then, the punch 1 is pulled out from the pipe P to remove the section 15. Since this section 14 is small,
It can be easily taken out from the cord insertion hole H or the opening of the pipe P.

As described above, the cutting edge portion 7 of the punch 1 punches the arc-shaped edge Ha of the target insertion hole H into a punch shape by the cut-off blade 10 and the arc-cutting blade 11, and the cut-off blade 10 and the cut-off blade 10 are long. Since the section 14 is cut and raised by the edge cutting blade 13, the insertion hole H has a larger inner diameter area than the conventional one, and the depth of the insertion hole H is larger than that of the conventional one, as shown in FIG. There is no sharp arcuate section.

[0017]

As described above, according to the present invention, the pressing surface and the cut-off surface can hold down a part of the section generated when forming the insertion hole and cut off a part of the section. Since the inner diameter area of the insertion hole can be made large, it can be easily inserted into the pipe without damaging the wiring.

[Simple Invention of the Drawing]

FIG. 1 is a perspective view of a cutting edge portion of a punch.

FIG. 2 is a side view of a cutting edge portion.

FIG. 3 is a view of a pressing surface side and a bottom surface side of a cutting edge portion.

FIG. 4 is a state diagram in which a punch is set on a pipe.

FIG. 5 is a sectional state view in which a punch is driven into a pipe by a press machine.

FIG. 6 is a top view of an insertion hole opened in a pipe.

FIG. 7 is a sectional view showing a state in which the punching of the insertion hole is completed.

FIG. 8 is a sectional state view of inserting a wiring into an insertion hole.

FIG. 9 is a perspective view of an inclined surface of a conventional punch.

FIG. 10 is a top view of an insertion hole formed by a conventional punch.

FIG. 11 is a sectional state view of inserting a wiring into an insertion hole formed by a conventional punch.

[Explanation of symbols]

 1 Punch 3 Cutting edge part 4 Arc part 5 Side surface 6 Bottom surface 8 Cut-off surface 9 Pressing surface 10 Cut-off blade 14 Segment 15 Segment C slope surface P Pipe X Angle between arc part and slope surface Y Slope surface and cut surface Angle between

[Procedure amendment]

[Submission date] September 16, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction content]

[0017]

As described above, according to the present invention, the pressing surface and the cut-off surface can hold down a part of the section generated when forming the insertion hole and cut off a part of the section. Since the inner diameter area of the insertion hole can be made large, it can be easily inserted into the pipe without damaging the wiring.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a perspective view of a cutting edge portion of a punch.

FIG. 2 is a side view of a cutting edge portion.

FIG. 3 is a view of a pressing surface side and a bottom surface side of a cutting edge portion.

FIG. 4 is a state diagram in which a punch is set on a pipe.

FIG. 5 is a sectional state view in which a punch is driven into a pipe by a press machine.

FIG. 6 is a top view of an insertion hole opened in a pipe.

FIG. 7 is a sectional view showing a state in which the punching of the insertion hole is completed.

FIG. 8 is a sectional state view of inserting a wiring into an insertion hole.

FIG. 9 is a perspective view of an inclined surface of a conventional punch.

FIG. 10 is a top view of an insertion hole formed by a conventional punch.

FIG. 11 is a sectional state view of inserting a wiring into an insertion hole formed by a conventional punch.

[Explanation of symbols] 1 Punch 3 Cutting edge part 4 Arc part 5 Side surface 6 Bottom surface 8 Parting surface 9 Holding surface 10 Parting blade 14 Section 15 Section C Inclined surface P Pipe X Angle between arcuate part and inclined surface Y Inclination Angle between the surface and the parting surface

Claims (1)

[Claims] 1. A punch for punching a substantially U-shaped hole in a pipe, wherein a tip of the cutting edge portion formed in a substantially U-shaped cross section by an arc portion, a side surface and a bottom surface is directed from the arc portion to the bottom surface. And a square-shaped pressing surface by cutting from the joining portion of the arc portion and the side surface of the inclined surface cut at a predetermined angle toward the arc portion at a predetermined angle with respect to the inclined surface. Surface and a cutting edge formed by the intersecting line of both surfaces, the punch is driven into the pipe at a predetermined angle to cut an arc-shaped segment into the pipe and a rectangular segment to the pipe. A punch for punching in a U-shape by pressing it inside.