JPS596729B2 - Method and device for cutting out long metal hollow pipe materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for cutting out a long hollow metal pipe material and an apparatus for the same, and in particular, to a method for cutting out a long hollow metal pipe material, and in particular, a method for cutting out a hollow metal pipe material in the middle of the hollow metal pipe material, which is prone to core runout due to variations in the material itself or due to its long length. It is designed to enable efficient and highly accurate cutout processing using small press pressure.

Hereinafter, the specific configuration of the present invention will be explained in detail based on the drawings.
FIG. 1 shows a finished product processed according to the present invention, where M is a long metal hollow pipe material (hereinafter simply referred to as material) having a rectangular or oval cross section.

), and a large cutout 1 having a desired opening width w and opening length L is formed in the middle thereof. In cutting out such a large cutout 1, in the present invention, as shown in FIG. First, a plurality of small notches 3 which are opened by a certain length ι with the piece 2 placed thereon are cut out all at once to form the entire key, and as is clear from FIG. After moving it by a certain stroke s in its longitudinal direction according to the method,
Using the same press die and core metal as in the first step described below, the remaining parts including a plurality of remaining convex pieces 2 facing between the small notches 3 are also cut out all at once, and this is continuously carried out. It is formed as a large cutout 1 that opens. That is,
In FIGS. 4 to 8 showing the press mold for the cutout process, A is a fixed lower mold, and on the mounting base plate 4 there is a pair of mold blocks facing each other, which are divided into two with an L-shaped cross section. 5 and 6 are fixed, thereby defining a groove 7 for setting the material M.

In this case, both mold blocks 5 and 6 are not identical to each other, and one of the mold blocks 5 has a simple cross section L that is uniform over its entire length.
The other die block 6 has a plurality of grooves 8 for receiving male blades corresponding to the small notches 3 in the material M, facing the band groove 7. There is. Each groove 8 is opened wider than the opening width w of the large notch 1 and small notch 3 in the material M, and the band groove 7
It is recessed deeper than the groove bottom, and functions as a female blade for shearing the material M in conjunction with the male blade described later. 9
10 denotes a plurality of blind holes for receiving movable pins bored between the grooves 8 in the mold block 6 so as to correspond to the remaining convex pieces 2 of the material M, and 10 denotes a band groove 7 formed by both mold blocks 5 and 6. A plurality of fixing pin implant holes are drilled at the end positions of the.

Further, B is a movable upper mold, and this is formed with a plurality of male blades 11 that fit into the grooves 8 acting as the female blades of the lower mold A, and a plurality of material release grooves 12 facing between the male blades 11. has been done.

Reference numeral 13 designates a positioning guide pin that is suspended so as to project by a certain height H from the cutting edge of each male blade 11, and its projecting tip is particularly sharpened as a conical surface 14.

Reference numeral 15 designates a plurality of punching pins that are suspended in the relief groove 12 in parallel so as to protrude from the cutting edge by approximately the same height as the guide pin 13, and correspond to the blind hole 9 of the lower die A. Have fun with this.

Note that 16 is a mounting shaft for the lower mold. Furthermore, C is a core metal inserted into the hollow interior of the material M to fix and restrain it from the inside, and as is clear from FIG. A plurality of compatible fixing pin through-holes 17 are formed, and the fixing pin 1 to be implanted therein is formed.
8, the material M is fixedly set in the band groove 7 of the lower die A.

This core metal C has a substantially key-shaped planar shape in the middle, and between the small notches 3 and the corresponding concave notches 19 of the material M, there is a movable pin that matches the blind hole 9 of the lower die A. A protrusion 21 having a receiving through hole 20 is connected. In addition, 22 is an insertion guide tapered surface formed on the other end of the core bar C, and the total length of the core bar C is as short as possible as long as it can cover the cutout length part of the material M. It's better. A method for cutting out the material M using the above-mentioned apparatus will be explained as follows.

That is, insert the core metal C into the hollow interior of the material M, set it in the band groove 7 of the lower mold A as shown in FIGS. 6 to 8, and connect the through hole 10 of the lower mold A with the core metal. A plurality of fixing pins 18 installed in the through holes 17 of C are passed through the material M to fix it. From this preparation state, as the first step, first see Figure 9 1.
The movable upper mold B is lowered relative to the fixed lower mold A as shown in FIG. 2, and the semi-finished product shown in FIG. Multiple small notches shown 3
are removed from the material M all at once. In this case, since the punching pin 15 that protrudes from the male blade 11 is suspended from the escape groove 12 of the upper mold B, this pin 15 quickly punches the material M as shown in FIG. Due to the thrusting and restraint of the core metal C, the small notch 3 is then cut out by the male blade 11 while the material M is fixed so as not to be displaced from both the inside and outside surfaces. At this time, since the guide pin 13 is also protruding and hanging down from the male blade 1, this pin 13 also precedes the male blade 11 and is attached to the material M.
Needless to say, it is inserted into the. In this way, a through hole 23 is formed in the remaining protrusion 2 facing between the small notches 3 by the punching pin 15, and the semi-finished product shown in FIG. 2 is obtained. Therefore, while the core C is attached and fixed to the lower die A, only the material M is moved in the longitudinal direction by a fixed stroke S, and the core C is again
The upper mold B is then fixed to the lower mold A using fixing pins 18, and then, as a second step, the upper mold B is lowered relative to the lower mold A in exactly the same manner.

In this case, the movement stroke S is the punching pin 15
In other words, for the semi-finished product shown in FIG. 2, it is set as the mutual distance between the center of the small notch 3 and the center of the remaining protrusion 2, If mold B is lowered again, Fig. 10 1
As shown in the figure, another guide pin 13 naturally fits into the through hole 23 opened before the remaining convex piece 2, and the material M without the core metal C is still correctly restrained and positioned. , the remaining convex piece 2 can be sheared off at once with the male blade 11. At this time, the punching pin 15 is punched blankly into the small notch 3 as shown in FIG. 10. Through these two steps, the large cutout 1 in Fig. 1 having the desired opening length L is completed, as suggested by the chain line in Fig. 1 and the schematic diagram in Fig. 3. As shown, while using the same press mold, material M
Since only the remaining convex pieces 2 are moved by a certain stroke S, not only the plurality of remaining convex pieces 2 but also the small notch 3 located at the end thereof
Also, a part of the material M itself adjacent to is cut away in the second step. As indicated by the symbol T in Fig. 3, the remaining convex piece 2 is cut out in the second step.
It is preferable to overlap by a certain length so that the cut ends do not become zero. The fact that the protruding tip of the guide pin 13 is formed into a conical surface 14 means that the punching pin 15
This helps to facilitate the subsequent correct centering of another guide pin 13 into the through hole 23 of the material M opened by the process. The automatic insertion of the pins 13 and 15 into the material M is advantageous in attracting and fixing the material M so that the position of S cannot be displaced, particularly in the width direction.

As described above, in the present invention, the material M is used in both the first and second steps.
To, punching pin 15 and guide pin 13 of movable upper mold B
Since the material M is chipped while being inserted, shearing force is applied to the material M, and together with the core metal C inserted into the hollow interior, the long material is likely to cause core runout. M can be reliably restrained and fixed, and there is an effect that cutting can be performed with high precision in that state.

Moreover, in the first step, a plurality of small notches 3 are first cut out, and then the remaining portions adjacent to the small notches 3 are cut out,
Since the large cutout 1 with the desired constant opening length L is processed and formed, a small press machine with a small tonnage is used to form the large cutout 1.
This allows for easy processing with high efficiency and uniform quality, and also saves installation space. Furthermore, the processing equipment includes a fixed side press lower die A having a male blade receiving groove 8 corresponding to a plurality of small notches 3, a corresponding male blade 11, a punching pin 15, and a guide pin 13. The upper mold B on the movable side has two types of pins, and the mutual distance between the two pins 13 and 15 is equal to the movement stroke S of the material M.
Since the small notches 3 are set as , while using the same small press mold, the remaining part adjacent to the small notch 3 can be cut out automatically, and the large notch 1 for the purpose can be completed with high precision, and the mold is also inexpensive. It can be said to be an excellent invention for practical use because it can be obtained easily and can be implemented with simple operations.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the main part of the finished product obtained by the present invention, Fig. 2 is a perspective view of the main part of the semi-finished product, and Fig. 3 schematically shows the correlation between material movement and chipping action. An explanatory diagram showing,
Figure 4 is a slope view of the press die, Figure 5 is a slope view of the core metal,
FIG. 6 is a schematic side view showing the setting state of the material on the lower mold, FIG. 7 is a cross-sectional view taken along the line X-X in FIG. 6, FIG. 8 is a cross-sectional view taken along the Y-Y line, and FIG. H is an enlarged sectional view showing the main working parts of the first step, and FIG. 10 is an enlarged sectional view showing the main working parts of the second step. 1...Major notch, 2...Remaining convex piece, 3...Small notch,
8... Concave groove (female blade), 9, 20... Movable pin receiving hole, 11... Male blade, 13, 15... Pin, 23.
...Through hole, M...Material, A...Fixed lower mold, B...
・Movable upper die, C... core bar, S... moving stroke,
L...Opening length, T...Overlap length.

Claims (1)

[Scope of Claims] 1. When cutting out the large cutout 1 with the desired opening length L from the longitudinal midway point of the material M, first cut out a plurality of small notches 3 that divide the large cutout 1 into equal intervals D. The first step is to cut out the material M all at once, and then move only the material M by a certain stroke S in the longitudinal direction, and then remove the remaining portion 2 adjacent to the small notch 3.
The chipping action of both steps is performed by inserting the core metal C into the hollow interior of the material M while the material M is received and fixed in the fixed lower die A. , the punching pin 15 and positioning guide pin 13 of the movable upper mold B, which are also inserted into the material M from the outside, automatically restrain and fix the material M while forming the concave groove that becomes the female blade of the lower mold A. 8 and a male blade 11 of an upper mold B. 2. Assuming that a large cutout 1 with the desired opening length L is to be formed in the longitudinal midway of the material M, the large cutout 1 is spaced at equal intervals D.
A fixed lower mold A having male blade receiving grooves 8 corresponding to a plurality of small notches 3 divided at intervals, and a punching pin receiving blind hole 9 opened between the small notches 3;
A plurality of male blades 11 corresponding to female blades, a positioning guide pin 13 protruding from the blade edge, and a punching pin 1 also protruding from the blade edge between them.
A movable upper mold B having a movable upper die B in which the small notches 5 are suspended in parallel; and a plurality of recesses 19 corresponding to the small notches 3; and a through hole 20 through which the punching pin 15 passes through, while aligning with the blind hole 9 between them; is provided with a material fixing core C having a material fixing core C formed thereon, and the distance between the guide pin 13 and the punching pin 15 is determined by a movement stroke S in the longitudinal direction of the material M.
By defining as , after the small notch 3 is removed and moved by the shearing force of the female and male blades, the remaining portion 2 of the material M adjacent to the small notch 3 can be removed by the same upper and lower press molds B and A. Features: A device for cutting out long hollow metal pipes.