JPH0780550A - High precision press for u-shape bending long size material - Google Patents

Abstract

PURPOSE:To obtain a high precision press for U-shape bending a long size material by which precise flatness, parallelism and perpendicularity are obtained by providing a punch having projecting parts on both lower end parts and by which a thin metal sheet mounted on right and left lines of dies is punched. CONSTITUTION:Before punching, dies 22 by which right and left lines of dies are constituted are adjusted in height, for instance, lower toward the center, and also adjusted in horizontal compressing amount. Punching is carried out by mounting a thin metal sheet on the upper ends of both lines of dies 22 and punching the metal sheet by a punch 26 downward. As a result, a U-shape cross-sectional long size product having a bottom part 20b and leg parts 20a orthogonally bent from the bottom part 20b on both sides is obtained. Since projecting parts 26a for grooving are formed on the punch 20, springback in the bent inside is decreased and bending variance is decreased in the outside as the dies are adjusted and arranged. As a result, highly precise bending is performed owing to the synergistic effect of the above causes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-precision press device for long U-bending, and in particular, presses a thin plate having a U-shaped cross section (having a length 100 times or more the plate thickness). A device for processing.

[0002]

2. Description of the Related Art FIGS. 5 and 6 are front views showing a conventional press device for performing a long U-bending process. In the apparatus shown in FIG. 5, left and right dies 12 having a rectangular cross section, and a pad which is disposed between these dies 12 and which receives the bottom of a U-shaped elongated object which is a workpiece when punching. 14 and
A punch 16 for punching is used. In the apparatus shown in FIG. 6, the die 12 and the pad 14 are the same as those shown in FIG. 6, and as the punch, a punch 18 having grooved projections 18a formed on both sides of the bottom is used. To be done.

Punching is performed by placing a thin plate on the upper ends of the dies 12 on both sides and punching with a punch 14 from above, and as a result, the bottom portion 10b and the leg portions on both sides bent at right angles from the bottom portion 10b. A long product 10 having a U-shaped cross section in which 10a is formed is obtained.

FIG. 7 is a diagram for explaining the flatness, parallelism, and squareness of a U-shaped long object processed by these conventional apparatuses, and FIG. 7A is a plan view of the long object. FIG. 7 and FIG.
7b is a side view of the long object, and FIG. 7c is a line C- of FIG. 7a.
7C is a sectional view taken along line C-D of FIG. 7A and FIG. Here, the flatness refers to the flatness of the bottom portion 10b of the long object 10 as shown in FIG. 7b, and the parallelism is the parallelism of the two legs 10a of the long object 10 as shown in FIG. 7a. The right angle refers to the right angle of the leg portion 10a with respect to the bottom portion 10b of the elongated object 10 as shown in FIG. 7c or 7d.

[0005]

When a U-shaped long object is processed by the conventional punching device, as shown in FIG. 7b, the bottom portion 10b of the long object 10 has a recessed central portion, as shown in FIG. 7a. As shown, the central portions of the leg portions 10a on both sides of the long object 10 become narrower, and as shown in FIGS. 7c and 7d, the leg portions 10a of the long object 10 are longer than the bottom portion 10b. Is 90 degrees or less in the central part of the above and 90 degrees or more in the end portions.

The flatness and parallelism of a long object obtained by the conventional punching device shown in FIG. 5 is about 0.2 mm.
/ 100 mm, and the squareness is about ± 1 °. Also,
The flatness and parallelism of the long product obtained by the conventional punching device shown in FIG. 6 are 0.1 mm / 100 mm, and the squareness is about ± 30 ′. The punching device shown in FIG. 6 has improved accuracy in flatness, parallelism, and squareness as compared with the punching device shown in FIG. 5, but it is considerably difficult to process and adjust the dimensions, and the bending height changes. However, there was a fear that the specifications would not be met.

For this reason, when more precise flatness, parallelism, and perpendicularity are required for a long product, the conventional punching process cannot be used. I was getting things.

Accordingly, an object of the present invention is to provide a high precision press machine for long U-bending which can obtain precise flatness, parallelism and squareness.

[0009]

SUMMARY OF THE INVENTION To achieve the above object, the present invention has a substantially L-shaped cross section with a protrusion on the inner lower portion, and is adjacent so that the height can be adjusted. A row of left and right dies composed of a plurality of dies arranged, and a pad arranged between the rows of the left and right dies to receive the bottom of a U-shaped elongated object which is a workpiece during punching, A high precision press device for long U-bending is employed, which has punches having protrusions on both lower sides, which punches thin plates placed on the rows of the left and right dies.

[0010]

EXAMPLES Next, examples of the present invention will be described. Figure 1
It is a front view which shows the high precision press apparatus of the long U bending process of Example 1 of this invention, and FIG. 2 is a front view which shows the high precision press apparatus of the long U bending process of Example 2 of this invention. Yes, FIG. 3 is a perspective view of the die used in Example 1, and FIG.
7 is a perspective view of a die used in Example 2. FIG.

(Embodiment 1) In the press apparatus of Embodiment 1 shown in FIG. 1, the cross section is substantially L-shaped (see FIG. 3), that is, it has a protrusion 22b inside and a protrusion 2
A plurality of (in this example, five) adjacently arranged rows of left and right dies 22 having curved portions 22a for connecting a smooth curved line between the upper portion of 2b and the body side, and these A pad 24, which is arranged between the rows of the left and right dies 22 and receives the bottom of a long object having a U-shaped cross section, which is a workpiece during punching, and a punch 26 for punching are used. Groove protrusions 26 a are formed on both sides of the bottom of the punch 26.

Prior to punching, the individual dies 22 forming the left and right die rows are adjusted in height, for example, arranged so as to be gradually lowered toward the center, and the planar compression amount is adjusted. Punching is performed by placing a thin plate on the upper ends of the rows of dies 22 on both sides and punching with a punch 26 from above, resulting in bottom 20b and bottom 20b.
A long object 20 having a U-shaped cross section, in which the leg portions 20a on both sides bent at right angles are formed, is obtained. Since the protrusion 26a for grooving is formed in the punch 26, the spring back is reduced on the inner side of the bending, and the die is adjusted and arranged on the outer side, so that the bending clatter is reduced. As a result, these synergistic effects enable highly accurate bending.

(Embodiment 2) In the press apparatus of Embodiment 2 shown in FIG. 2, the cross section is substantially L-shaped (see FIG. 4), that is, it has the protrusion 32b inside and the protrusion 3
A plurality of (in this embodiment, 5 b in this example, different from the first embodiment) a substantially right angle is formed between the upper part of 2 b and the body side.
Rows of the left and right dies 32 arranged adjacent to each other, and a bottom portion of the long object having a U-shaped cross section, which is a workpiece to be processed during punching by being arranged between the rows of the left and right dies 32. A pad 24 for receiving and a punch 26 for punching are used. Groove protrusions 26 a are formed on both sides of the bottom of the punch 26.

Similar to the first embodiment, before punching, the heights of the individual dies 32 forming the left and right die rows are adjusted, and for example, the dies 32 are arranged so as to be gradually lowered toward the center, and are flat. The amount of compression is adjusted. For punching, the thin plate is placed on the upper ends of the rows of the dies 32 on both sides, and the punch 2 is pressed from above.
Made by punching at 6, resulting in bottom 2
0b and the leg 20a on both sides bent at a right angle from the bottom 20b are formed to obtain a long object 20 having a U-shaped cross section. Since the protrusion 26a for grooving is formed in the punch 26, the spring back is reduced on the inner side of the bending, and the die is adjusted and arranged on the outer side, so that the bending clatter is reduced. As a result, these synergistic effects enable highly accurate bending.

In each of the construction methods of Example 1 and Example 2, the flatness and parallelism of the obtained long product were about 0.02 mm / 100 mm, and the squareness was about ± 1.
It was 0 '.

[0016]

As described above, according to the present invention,
When pressing a long object having a U-shaped cross section, it is possible to obtain a pressing device capable of achieving more precise flatness, parallelism and squareness.

[Brief description of drawings]

FIG. 1 is a front view showing a high precision press device for long U-bending according to a first embodiment of the present invention.

FIG. 2 is a front view showing a high precision press device for long U-bending according to a second embodiment of the present invention.

FIG. 3 is a perspective view of a die used in the first embodiment.

FIG. 4 is a perspective view of a die used in Example 2.

FIG. 5 is a front view showing a conventional press device for performing a long U-bending process.

FIG. 6 is a front view showing a conventional press device for performing a long U-bending process.

FIG. 7 is a diagram for explaining the flatness, parallelism, and squareness of a U-shaped long object processed by these conventional apparatuses.

[Explanation of symbols]

 20 U-shaped long object 22 Die 24 Pat 26 Punch 32 Die

Claims (3)

[Claims] 1. A row of left and right dies, each of which has a substantially L-shaped cross-section and has a plurality of dies arranged adjacent to each other so as to be adjustable in height so as to have a protrusion at a lower portion of the inside, A pad that is arranged between the rows of dies and receives the bottom of a long object having a U-shaped cross section, which is a workpiece when punching, and punches a thin plate placed on the rows of the left and right dies. Long U characterized by having punches with protrusions on both sides
High precision press machine for bending. 2. The high precision press apparatus for long U-bending according to claim 1, wherein the die has a curved portion for connecting a smooth curved line between an upper portion of the protrusion and a main body side. A high-precision press machine that features long U-bending. 3. The high precision press device for long U-bending according to claim 1, wherein the die is formed at a right angle between the upper portion of the protrusion and the body side. High precision press machine for bending.