JPH07100194B2 - Cutting die for making bending cuts in square pipes, etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Purpose of the invention [Industrial field of application] The present invention makes a V-shaped notch in a workpiece such as a square pipe or channel steel, bends the notch, and bends the notch. In the process of manufacturing the polygonal frame body by butt welding the cut surfaces,
The present invention relates to a cutting die for making the above V-shaped cut.

[Conventional technology]

Regarding the above-mentioned processing method and cutting die, JP-A-54-
No. 122668 and Japanese Patent Laid-Open No. 51-87884.

[Problems to be solved by the invention]

However, since the known cutting die cannot remove the burr that appears at the cut end, a separate deburring step is required. In addition, a product that is a frame body formed by combining frames that have undergone bending and welding processes has a large number of mounting holes for other devices, and it is also necessary to make holes for the immersion cleaning liquid at the bent corners of the product.

It is an object of the present invention to provide a cutting die that performs the above-described deburring / drainage hole forming processing simultaneously with V-shaped cutting processing.

B, Configuration of the Invention [Means for Solving the Problems] The present invention relates to a blade body 1 whose cross section perpendicular to the blade axis Y-Y is an isosceles triangle, from the apex 3 of the isosceles surfaces 2a and 2b. An inclined bottom surface 5 that is inclined toward the bottom side 4 is formed, and its apex ridge line 6 and the intersection ridge lines 7a and 7b of the bottom surface 5 and the isosceles surface 2a and 2b.
As the blade surface, and the cut surface of the workpiece W on the isosceles surfaces 2a and 2b.
Deburring convex blades 8a and 8b appearing on Wa and Wb, and convex blade 9c for forming concave portions Wc and Wd for forming a drain hole on the cut surface
・ A cutting die for making bending cuts in square pipes, etc. characterized by having 9d.

[Action]

A process in which one side S1 of the square pipe W is left, V-shaped cuts Wa and Wb are respectively inserted in two opposite sides S2 and S3 that are perpendicular to the side S1, and the V-shaped cut surface and the side S4 forming the bottom surface are cut off. Simultaneously with the step of using the triangular cutting die, burrs that are bent from the V-shaped notch and come out on the outer surface of the butting are scraped off by the convex blades 8a and 8b.

In addition, the convex blades 9c and 9d face the abutting surface to form a concave
Wc and Wd are formed to form a water cleaning liquid drain hole b.

〔Example〕

 First, a product to which the present invention is applied will be briefly described.

As shown in Fig. 5, V is formed at a predetermined interval on the workpiece (square pipe) W.
A notch is made, and the notch is bent as shown in FIG. 6 to form a rectangular frame F shown in FIG. 8, and each butted portion is welded. The upper and lower frames are connected with a square pipe Fa to form a frame. Each part F / Fa of the frame is provided with a large number of small holes or screw holes ha for supporting the device.

In the butt welded portion of the cut faces Wa and Wb of the frame F, if there is a burr at the time of V-shaped cutting, the finish of the welding line will be poor and the product value will decrease, so deburring is conventionally performed after cutting. ing.

Also, when the finished frame is immersed and washed in the pre-process of painting and plating, the cleaning liquid that has entered through the holes ha will remain in the corners of the frame F and cause rusting. There is.

According to the present invention, the V-shaped cutting die has the above-described structure, and the fixed lower mold 11 is formed with the concave groove 12 for horizontally and immovably holding the workpiece W as shown in FIGS. 1 and 2. , A cutting die through hole 13 that penetrates vertically, and a die guide integrated with the cutting die 1.
A guide groove 15 for 14 is provided.

The cutting die 1 for the workpiece W set in the lower die 11
When the die 1 is lowered by a known press device in such a relation that the blade tip 3 of the blade bites inside the remaining side S1 of the workpiece W, for example, about 1/5 of its thickness t, Side S2
S3 is cut into the V shape shown in FIG. 5 by the blade surfaces 7a and 7b of the inclined ridge.

When the blade tip 3 of the cutting die 1 reaches the lower side S3 of the workpiece W, the convex deburring blades 8a, 8b come into contact with the outside of the cut surface of the sides S2, S3, and the cutting die 1 follows the lower die 11. By passing through the hole 14, burrs on the cut surface are scraped off.

Further, during the above steps, the convex blades 9c and 9d form the concave portions Wc and Wd on the cut surfaces Wa and Wb.

Therefore, when the workpiece W is taken out from the lower die 15 and is bent from the notch as shown in FIG. 6 and the cut surfaces Wa and Wb of the two sides S2 and S3 are butted against each other, burrs are produced at the butted part. There is no.

Further, the recesses Wc and Wd are combined with each other to form a drain hole h at the bent corner. The hole may be a square hole other than the illustrated round hole.

Although the example illustrates the case of making a rectangular frame, the present invention is also applied to V-shaped cuts for other polygonal / triangular frames, and the opening angle of the isosceles side of the triangular blade body 1 is merely used. Is different.

In addition, the notch formed in the meat part of the side S1 for facilitating the bending accurately may compress the inside of the bending during the bending, resulting in thickening and mutual interference. Therefore, depending on the shape of the blade of the apex ridge line 6, In addition to the V shape of the embodiment, (a) mountain shape shown in FIG.
(B) U-shape with small rounded corners, or JP-A-51-12
The circular hole (c) disclosed in the specification of 3760 may be used.

In addition, a blade for forming a groove gap We may be provided on the blade body at the end of the abutting portion in order to improve entry of the welding material.

Further, the present invention is also applicable to the V-shaped notch for the channel steel described in JP-A-51-123760.

C. Effect of the Invention As described above, since the burr generated at the bent butting portion and the immersion cleaning liquid drain hole are formed at the same time as the step of making the V-shaped notch for bending in the square pipe, channel steel, etc. ,
Compared with the conventional one that requires a deburring / drilling process after the V-shaped cutting process, the process is saved and the cost is reduced. Also, the finished appearance is good and the quality of the product is improved.

[Brief description of drawings]

FIG. 1 is a side view of a cutting die of the present invention, FIG. 2 is an enlarged cross-sectional plan view thereof, FIG. 3 is a front view of a lower portion thereof, and FIG. 4 is an explanatory view of a relation between each blade portion and a workpiece, FIG. 5 is an explanatory view of a V-shaped cut in a processed material, FIG. 6 is a perspective view showing the bent state, and FIGS. 7 (a), (b), and (c) are cut grooves at the top end of the cut. FIG. 8 is a partially enlarged plan view illustrating an example, and FIG. 8 is a perspective view illustrating a frame frame formed by bending a processed pipe according to the application of the present invention. 1 ... Triangular blade, 2a / 2b ... Isosceles surface, 3 ... Isosceles vertex, 4
... bottom edge, 5 ... sloping bottom surface, 6 ... apex ridge line, 7a / 7b ... intersection ridge line, Wa / Wb ... cut surface, 8a / 8b ... deburring blade, 9c / 9d ... recess forming blade.

Claims (1)

[Claims] Claim: What is claimed is: 1. A blade body having an isosceles triangle whose cross section perpendicular to the axis of the blade is formed with an inclined bottom surface that is inclined from the apex of the isosceles surface toward the bottom side. The intersection ridge line is used as the blade surface, and the isosceles surface is provided with a convex blade for deburring that appears on the cut surface of the workpiece and a convex blade for forming a recess for forming a drain hole on the cut surface. A cutting die that inserts a bending cut into a characteristic square pipe, etc.