JPH07100190B2 - NC punch press oblong hole machining method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] A round punch having the same diameter as the width of an elliptical hole is used to form a circular hole at the positions of the center and both ends of the elliptical hole. A method of machining an elliptical hole using the NC punch press, in which a round hole with the same diameter is machined in the center and the above operation is repeated until the irregularities on the straight line are within the specified dimensions.

[Industrial application field]

 The present invention relates to a sheet metal working method.

In particular, in the processing of oblong holes that are often formed in thin sheet metal such as casings and covers by NC punch press, one side abrasion of the punch and one side of the die due to one side of the punch and breakage are reduced, On the other hand, there is a demand for a new elliptical hole processing method that reduces the return.

[Conventional technology]

A conventional punching method using an NC punch press for elliptical holes, which is often applied to sheet metal, is a round punch whose diameter is the width of the elliptical hole according to a command from the NC device, as shown in Fig. 3 (a). ， For example, while processing an oval hole with a width of 6 mm, the diameter is 6 mm
Select a round punch of No. 1 and connect it to one end of the two-dot chain line oval hole to be formed with the round punch 1 ', that is, the diameter.
A 6 mm hole is formed, and as shown in FIG. 4, the specified dimension s of the protrusion formed by the unevenness of the straight part of the oval hole, that is, the adjacent arc
To within 0.1 mm, for example, within 1.5 mm for a round hole having a diameter of 6 mm, as shown in FIG. Sheet metal material (hereinafter referred to as material) is intermittently moved in the direction of arrow A so that the round punch apparently moves in the direction B, and in the meantime, the round holes 2 ', 3', 4 '... n. ′ Is formed in succession to form an elliptical hole.

As a method other than the above, as shown in (b), round holes 11 are formed at both ends of the oval hole to be formed by a round punch having a diameter of the oval hole. A rectangular punch having the width of the elliptical hole is operated a plurality of times to form the oblong hole by overlapping and connecting the rectangular holes 12, and a long hole having a specified width (not shown) is formed. There is also a method in which an oval punch having a short length is shifted in the longitudinal direction and processed by a plurality of operations.

[Problems to be solved by the invention]

The problem with the conventional processing method shown in FIG. 3 is that
A round hole is punched out at one end of the elliptical hole so that the unevenness or step of the straight line part is within 0.1 mm, and the material is extracted in a crescent shape with the feed width by minute feed in the longitudinal direction with reference to the hole. Therefore, a processing stress is frequently applied to the semi-circular portion in the traveling direction to cause one side wear and breakage of the round punch.

Therefore, due to the wear of the punch, the punched oval hole has a large return, which requires a lot of time for the correction work, and the punch is consumed too much, resulting in a high machining cost.

In addition, a processing method using a combination of a round punch and a rectangular punch, or a processing method using an oval punch having a short length requires high precision in setting each punch, and the rectangular punch or the oval punch set is set. There is a problem that it cannot be used except for forming an elliptical hole in the same direction as the longitudinal direction.

In view of the above situation, the present invention has an object to provide an elliptical hole machining method for an NC punch press which is less likely to cause abrasion and breakage on one side of the punch, and has less machining return.

[Means for solving problems]

As shown in FIG. 1, the above problem is caused by punching out a round hole 1 at the center of an oval hole to be formed by a round punch having a diameter of the oval hole, and using the hole as a reference, The circular holes 2 and 3 are machined at the positions of both ends to form arcs at both ends in the longitudinal direction, and the circular holes 2 and 3 at both ends and the circular hole 4 of the same diameter are provided between the central circular hole 1 and 4. And 5, and then round holes 6,7,8,9 ... with the round punch at the center between the adjacent round holes, and the specified dimension s of the unevenness of the straight line portion or the step is within 0.1 mm. This can be solved by the elliptical hole machining method of the NC punch press of the present invention, which is repeatedly formed n times until it is formed.

[Action]

That is, in the present invention, round holes 1, 2, and 3 are punched out at the positions at the center and both ends of the oval hole to be formed, and the round hole 2 is formed.
Round holes 4 and 5 of the same diameter are formed in the center of 1, 1, and 3 until the unevenness of the straight part of the oval hole is within the specified dimension. By repeatedly actuating the punch and scraping off the convex parts of the opposing straight parts,
Since the resistance applied to the cutting edge of the round punch is symmetrical with respect to the center of the punch, and its size is also equal,
It is possible to prevent abrasion and breakage on one side of the mold and reduce the return of processing.

〔Example〕

The present invention will be described in detail below based on the embodiments shown in the drawings.

FIG. 1 shows an elliptical hole machining method for an NC punch press according to this embodiment, and the method will be described in more detail. First, a round punch having a diameter equal to the width of the elliptical hole to be formed is selected. The material for forming the circular hole is moved, the center line of the round punch is aligned with the center of the elliptical hole, and then the round punch is actuated to form the circular punch as shown in FIG. A circular hole 1 having a diameter equal to the width of the elliptical hole is formed at the center of the elliptical hole of the two-dot chain line, and the position of the center of both arcs of the elliptical hole and the center of the circular punch are formed with the circular hole 1 as a reference. Move the material in the direction of arrow A and B in order so that the line matches
2 and 3 are punched out to form arcs at both ends.

Then, as shown in FIG. 2B, the center on the center line of the round hole 2 at one end and the round hole 1 at the center, the round hole 1 at the center, and the round hole 3 at the other end.
The material is moved in the direction of arrow B to form round holes 4 and 5 at the center on the center line of.

Then, as shown in FIG. 6C, the round holes 6 are alternately formed in the centers of the adjacent round holes formed in advance from the both ends toward the center.
In order of 7,8,9, that is, between the round hole 2 and the round hole 4, the round hole 6 and the round hole 5
A round hole 7 between the round hole 3 and the round hole 3, a round hole 8 between the round hole 4 and the round hole 1, and the same operation as described above is repeated. Until the dimension s of the protrusion formed by the arc and the specified dimension is within the specified dimension, the material is moved alternately in the arrow A or B direction to repeatedly operate the round punch so as to form n round holes. .

From the above, the resistance applied to the cutting edge of the round punch is scraped off the convex portions of the opposing straight portions, so it balances with respect to the center of the punch, thereby preventing one-sided wear and breakage of the die and the return of machining. Can be reduced.

In the above example, the unidirectional elliptical hole processing method was described, but if the NC punch press can control the material feeding to the pitch where the irregularities of the linear portion are within the specified dimension, the material can move in the movable direction. Capable of processing oval holes in all directions. Further, it is possible to machine an elliptical hole having an arc shape.

Further, even in the case of a narrow slit cut from the end face, a round hole is formed at the end face line, at the end of the slit, and at the center position of the slit, and after that, by repeating the same operation as the above processing method, the mold can be returned without damage. Fewer slits can be formed.

In addition, the method of making the NC tape used for the above elliptical hole processing is
As shown in the block diagram of FIG. 2, the input device 12 inputs the width, length, center coordinate, and direction of the oval hole, that is, the inclination angle, to the central processing unit 11 of the computer, and the input information is used. The central processing unit 11 calculates the order and position of forming the circular holes, and the width information of the elliptical holes is used to process the processing information film 13
And inquire the tool number of the round punch corresponding to the width of the oval hole based on the selection criterion of the machining information file 13.

Then, the returned tool number is further transmitted to the cutter location file 14, the position corresponding to the punch corresponding to the tool number is set in the turret table, the position number is obtained, and the position information of the punch and the The order of forming the circular holes and the position information are edited, and the NC tape 15 for elliptical hole processing is created by a paper tape puncher (not shown).

By operating an NC punch press with this NC tape 15, it is possible to machine predetermined elliptical holes in a designated order. Alternatively, the NC tape 15 may be omitted and the machining command and the machining data may be directly applied to the NC punch press.

〔The invention's effect〕

As described above, according to the present invention, there is an advantage that it is possible to prevent one side wear of the mold and the return of the elliptical hole by an extremely simple method, and it is possible to expect a remarkable economic and reliability improving effect on an industrial scale. Is very useful for.

[Brief description of drawings]

FIG. 1 is a diagram showing an oval hole machining method of an NC punch press according to an embodiment of the present invention, FIG. 2 is a block diagram for making an NC tape of this embodiment, and FIG. FIG. 4 is a diagram showing a method for processing a circular hole, and FIG. 4 is an enlarged view showing irregularities of a linear portion of an oval hole. In the figure, 1, 2, 3, ...

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshitomo Takihara 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited (72) Inventor Yukio Yamamoto 1015, Kamedotachu, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited ( 56) References JP-A-61-292739 (JP, A)

Claims (1)

[Claims] 1. A circular hole (2, 3) is formed at the center of the elliptical hole to be formed by a round punch having the width of the elliptical hole as a diameter, and then the circular holes of the center are formed. A round hole (4,5) with the same diameter is machined in the center of the hole (1) and the round holes (1,2,3) at both ends, and then the round holes (6,7 The method for forming an elliptical hole in an NC punch press, characterized in that an elliptical hole having a specified size is formed by repeating a plurality of operations for forming a circular hole continuously.