JPH03110019A - Bending device - Google Patents

Abstract

PURPOSE:To obtain a uniform angle all over the length in bending a long material by making the shoulder width between lower die smaller at the intermediate position than at both ends. CONSTITUTION:When a T-bolt 10 at the intermediate position is rotated clockwise, a disk part 10a at the top end part pushes a wedge shaped part 9A in the Y direction, therefore, a wedge shaped part 9B is moved in the Z direction and a wedge shaped part 9C, too, is moved in the Z direction with this movement. The tapered surfaces 13 of the wedge shaped part 9C can be adjusted by these movements to reduce the shoulder width (d) between lower dies 6-1, 6-2. When the shoulder width (d) at the intermediate position is reduced by this adjustment, a bend angle is sharpened by lowering the upper die. When such adjustment is carried out by each T-bolt 10, the bend angle in bending a long material can be adjusted all over the length and can take a fixed value.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a bending device for plate materials.

(Prior Art) Conventionally, when bending a plate using a bending machine, a machine specifically designed for long pieces called a press machine has been used if the plate is long.

However, there was a problem in that the ram and bed were bent by the bending force, resulting in uneven bending angles over the entire length.

For this reason, in recent years, devices have been proposed to correct the deflection of the ram and bed. The former was Japanese Patent Publication No. 50-36511, and the @ one was Japanese Patent Publication No. 58-184019. In the former, a mold tool mounting board is installed on the slide part (ram), and small hydraulic jacks placed at regular intervals inside the slide part are used to deflect and compensate for the number of mold tools. There is. On the other hand, in the latter method, a substrate is provided on the bed, a lower mold holder is arranged on this substrate, and the deflection of the lower mold holder is corrected by the rust. be.

(Problem to be Solved by the Invention) However, in the above-mentioned apparatus, since a correction amount of deflection is applied to the upper die or the lower die before the bending process starts, the plate material as the workpiece must be held at one point. First, since the plate material is placed in an unstable state, the bending position is not stable, and depending on the plate material, there is a drawback that constant correction is required.

The present invention has been made in view of the above circumstances, and its purpose is to obtain a uniform bending angle over the entire length and a stable bending position when bending a long plate material. It is an object of the present invention to provide a bending device that can perform bending operations with high accuracy with simple operations depending on the width of the plate material.

(Means for Solving the Problem) In order to achieve the above object, the bending device of the present invention divides a lower mold into two in the longitudinal direction to form a groove shape having shoulder width, and the lower mold has a plurality of grooves in the longitudinal direction. The mold is divided into two parts, each of which is provided with a device for adjusting the shoulder width of the groove, and the shoulder width at the middle position of the lower mold is made smaller than the shoulder width at both end positions.

(Function) According to the bending device of the present invention, by making the shoulder width at the intermediate position smaller than the shoulder width at both end positions, the bending angle at the intermediate position becomes more acute than the bending angle at both end positions. Even if deflection occurs, it can be sufficiently corrected, and uneven bending angles over the entire length can be corrected. In the initial state of bending, the plate material is held at two points between the upper die and the lower die. Since the lower mold is held in a horizontal state and the lower mold is held in a horizontal state, the plate material placed on the lower mold is stable and the bending position can be reliably secured.

(Embodiment) An embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 3. Figure 1 is a diagram of the principle of the bending device, (a
) is an explanatory diagram showing the deflection that occurs in the bending machine, (c) is an explanatory diagram showing the bending angle of the plate material, (C) is a diagram of the principle of bending, and Figure 2 is a diagram showing the bending process with the bending machine installed. (a) is a front view, (b) is a side view, and Figure 3 is a bending machine, (a) is a top view, (b) is a front view, (C) is a cross-sectional view, (( (1) is a partial view of the main part.

The bending machine A shown in FIG. A main body portion is formed by a cut head (not shown).

A lower mold 6 having a groove in the longitudinal direction is mounted on the bed 5 of the main body. - Cylinders 1 supported by the frame B are provided in the upper part of the strength-grain body, and a ram 2 is attached to each cylinder 1 via a rod so as to be movable up and down. An upper mold 4 is provided on the lower end surface, and the upper mold 4 is brought into close contact with the lower mold 6 by the downward movement of the ram 2.

When the plate material 3 is placed on the lower die 6 of such a bending machine A and the ram 2 is lowered to press the upper die 4 against the plate material 3, the intermediate position of the ram 2 is bent upward and the intermediate position of the bed 5 is bent downward. Due to the bending, the bending angle at the intermediate position becomes obtuse as shown in FIG. 1(b), and warping occurs due to the moment of bending stress.

This is because the upper mold 4 comes into incomplete contact with the lower mold 6. In order to bring this incomplete contact into complete contact over the entire length of the plate material 3, the shoulder width of the lower mold 6 is adjusted to an intermediate position according to the amount of deflection. The aim is to obtain a uniform bending angle by narrowing the angle. This can be seen from the fact that the slope of the straight line showing the relationship between the bending angle and the ram stroke is greater when the shoulder width d is smaller, as shown in Figure 1 (C). It is shown that by making the value smaller, the intermediate position where the deflection is large is bent more than the both end positions of the plate material.

The present invention is based on this principle, and the outline thereof is shown in FIG. 2. The bending machine A shown in FIG. 2 is similar to the one shown in FIG. A processing device 7 is attached, and a lower die 6 is attached on this bending device 7.

This bending device 7 is shown in Fig. 3 (a), (b), and (C).
) and (d), a trough-shaped lower mold holder 8 is formed to place the lower mold 6 and has a generally concave cross section, and both end surfaces in the longitudinal direction are open openings. The shoulder width adjusting device 9 is housed in the lower mold holder 8 and divided into a plurality of equal parts in the longitudinal direction of the holder. The shoulder width adjustment device 9 includes wedge-shaped parts 9A, 9B,
It is composed of three parts made of 9C. The wedge-shaped component 9A has a width equally divided into the plurality of parts, and is a nearly cubic component that has a groove 11 on the front side for rotatably holding a T-shaped bolt 10, which will be described later, and an upper surface facing backward. Sloping slope! 2, which is slidably disposed on the inner bottom surface of the lower die holder 8. On the other hand, T-type Pol [40
is a bolt having a disk portion 10a at the tip, a tab 1013 on the front side, and a male thread IQc in the middle. Therefore,
By turning this T-shaped bolt 1a, the wedge-shaped part 9A, which is secured to the disk part 10a, slides on the inner bottom surface of the lower mold holder . Move in the direction of selling, like doing so.

A wedge-shaped component 9B is placed on the inclined surface 12 of the upper surface of this wedge-shaped component 9A.

This wedge-shaped component 9B is a rectangular plate-shaped block that slides into the front and rear walls of the lower die holder 8 and has the same width as the wedge-shaped component 9A, and is in sliding contact with the inclined surface 12 of the wedge-shaped component 9. A tapered surface having the same slope as the inclined surface 12 is formed on the contacting surface, and the corresponding upper surface side is formed to be perpendicular to the front and rear surfaces of the lower mold holder 8. .

The wedge-shaped component 9C is a component that stands upright at the front and rear ends of the wedge-shaped component 9B, and has tapered surfaces 13 that taper upwardly on the inner sides that correspond to each other. The surface 13 is formed with a gently curved surface in the width direction. This gently curved surface is shaped to engage and slide on a gently curved surface 6a provided on the back side of the lower die 6, which will be described later.The width direction of this wedge-shaped part 9C is the same as the width to the wedge-shaped part 9). :,
When adjacent parts of this wedge-shaped part 9C are arranged side by side, they are arranged so as to form a large gently arcuate surface (M2S shown by a dotted line) as shown in Figure (a).

In the shoulder width adjusting device 9 having the above configuration, by rotating the knob 10b of the T-shaped bolt 10 provided on each component, the wedge-shaped component 9A is moved in the X-Y direction in FIG. 3(C).
Then, the wedge-shaped part 9B is moved in the vertical direction perpendicular to the X-Y direction, that is, in the X-Z direction. . A lower die 6 is placed on the upper surface of the bending device 7 having such a configuration.

This lower mold 6 is formed into a disconnected circuit shape under the parts consisting of the lower molds 6-1 and 6-2, and the back side of the L-shape has the above-mentioned (gently curved surface of the wedge-shaped part 9C). It has a concave gently curved tapered surface 14 that slides on a tapered surface 13 having a .

This r! The Δ side surface of the A gently curved tapered surface fork 4 has a rising portion 15 formed by a surface parallel to this, and when mounted on the lower mold holder 8, the two surfaces 16 are parallel to the X-Y direction. The rear edge of the upper surface 1G is parallel to the gently curved surface 6a of the rising portion 15. Also the third
As shown in the figure (f), dovetail grooves 17 are formed at both longitudinal ends of the surface of the lower die G that comes into contact with the lower die holder 8, and the grooves 17 are formed to slide into the protrusion of the lower die boulder 8. The bottom mold 6 is @
(C) is configured such that only movement in the X-Y direction is possible.

Such lower mold parts 6-1 and 6-2 are vertically bent portions 15.
5 facing each other so as to correspond to each other, and are assembled via springs 18 that repel each other, and the concave curved tapered surface 14 on the back side of the rising portion 15 is brought into contact with the large wrinkled circular arc surface M13 formed by the wedge-shaped part 9C. The lower mold is mounted on the lower mold holder 8, and when viewed from the top, it is represented as a lower mold having a gently curved surface with a small intermediate position formed at the center in the longitudinal direction (see FIG. 3a).

In this specification, the width III formed by this groove is referred to as the shoulder width d.

The adjustment of this shoulder 4!1ild will be explained below. This shoulder width d is the width of the plurality of T provided on the @ side of the lower mold holder 8.
This is done by rotating the shaped bolt 10. That is, when the T-shaped bolt 10 at the intermediate position is turned clockwise, the disc portion 10a at the tip pushes the wedge-shaped part 9c in the Y direction, so the wedge-shaped part 9B moves in the Z direction, and along with this movement, the wedge-shaped part 9B moves in the Z direction. As the wedge-shaped part 9c also moves in two directions, the tapered surface 13 of the wedge-shaped part 9c forms the lower molds 6-1 and 6-2.
shoulder 41id can be adjusted to be smaller. This adjustment reduces the R radius d at the intermediate position, so that the bending angle when the upper die 4 is lowered becomes sharper. Hereinafter, by making such an adjustment using each T-shaped bolt 10, the bending angle for machining the bend tJ' of a long object can be adjusted over the entire length and can be kept at a constant value. Become. In addition, since the upper surfaces of the lower mold 6-mata and 6-2 can be mounted horizontally, stable mounting is possible, and since the shoulder width is grooved, the bending position can be determined accurately. I can do it.

(Effects of the Invention) As explained in detail above, the bending device of the present invention makes the middle position of the shoulder width of the lower mold smaller than the both end positions, so that a uniform angle can be achieved over the entire length when bending a long plate material. In addition, when starting the bending process, the plate material can be held at two or more points between the upper die and the lower die, and the lower die can be supported in the horizontal direction, so the plate material can be placed in a stable state. The bending position can be obtained.

In addition, the lower mold is formed into a groove shape and is divided into a plurality of parts in the longitudinal direction, each of which is provided with a shoulder width adjustment device, and the bending process can be performed by making desired adjustments according to the width of the plate material.
It has the advantage of being able to perform processing with high bending angle accuracy.

[Brief explanation of drawings]

Figure 1 (a) to (C) to Figure 3 (a), (b)
1 is an embodiment of the present invention, FIG. 1 is a principle diagram of a bending machine, FIG. 1(a) is a front view showing the bending machine, and (
C) is an explanatory diagram showing the bending angle of the plate material, (C) is a diagram of the bending principle, Figures 2 (a) and (b) are the bending machine equipped with the bending device, (a) is the front view, (b) is a side view;
3(a) to 3(c) show a bending machine, in which (a) is a top view, (a) is a front view, (C) is a sectional view, and (d) is a side view of the main part. 6...Lower die 6-1...Lower die 1 6-2...Lower die 2 7...Bending device 9...Shoulder width adjustment device 4r71 Roof surface & Figure 2 Figure 3 ( CI) Figure 3 (b) 0 (c)

Claims (1)

[Claims] In a device that bends a plate material using a lower mold and an upper mold, the lower mold is divided into two parts in the longitudinal direction to form a groove shape with shoulder width, and the lower mold is divided into a plurality of pieces in the longitudinal direction, and the divided parts are A bending device characterized in that a device for adjusting the shoulder width of each groove portion is provided, and the shoulder width at the middle position of the lower mold is made smaller than the shoulder width at both end positions.