JP2002018527A - Method and apparatus for bending - Google Patents

Abstract

PROBLEM TO BE SOLVED: To constantly support a material to be bent with a face and to prevent a stress from concentrating to one place so as to obtain optimum deformation. SOLUTION: In a bending method, by which a material 6 to be bent is placed, laid over a pair of support members 5, 5 arranged apart on a receiving table 4, the material 6 to be bent is subjected to cold bending by pressing an upper face of the material 6 to be bent with a pressing piece 3, respective support members 5, 5 consist of a fixing block 13 to fix on the receiving table 4 and a moving block 4 loaded on the fixing block 13, a support face 20 for material to be bent in face contact with a lower face of the material 6 to be bent is arranged on an upper face of the moving block 14, further, both blocks 13, 14 are joined as freely sliding each other with fitting a concave sliding contact face and a convex sliding contact face of circular arc shape each other, the moving block 14 is constituted so that an angle of the support face 20 for material to be bent is changed in following an angle of a lower face of the material 6 to be bent in pressing by the pressing piece 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bending method and a device for bending a material to be bent, such as a rectangular tube or a square bar.

[0002]

2. Description of the Related Art Conventionally, for example, when processing a rectangular tubular metal member having a curved end portion used for a pillar of a soundproof wall or the like, the material to be bent is vertically moved as shown in FIG. A so-called roller bending in which a load is passed between the rollers 1, 1... So-called roller bending, or a material to be bent is placed over a pair of support members installed at an interval, and bent between the two support members. A processing method of pressing the upper surface of a processing material with a pressing element and the like are widely known.

[0003]

However, in the prior art as described above, when the material to be bent and the supporting portion (roller 1) come into contact with each other with a line when pressurized by a press machine, stress concentrates on that portion. For example, when a work material having a large bending stress such as a rectangular tube material is worked by cold working, for example, as shown in FIG. 8, a portion in contact with the support portion of the work to be bent is deformed so as to be crushed. There was a problem. For this reason, when processing a material to be bent having a large bending stress, hot working or warm working is performed by heating the material to be bent at a high frequency or the like. The processing cost is high due to the labor and time spent and the heating device itself being expensive, and there is also a problem that the danger is greater than in cold working, and the processed product is easily oxidized. Was.

The present invention has been made in view of the above circumstances of the prior art, and has as its object to provide a bending method and apparatus capable of performing suitable bending at low cost at low cost.

[0005]

SUMMARY OF THE INVENTION The features of the present invention for solving the conventional problems as described above and achieving the intended purpose are as follows.
The material to be bent is placed over a pair of support members provided at an interval on a receiving stand, and the upper surface of the material to be bent is pressed between the two support members by a pressing element to press the material to be bent. In the bending method of cold bending a bending material, each of the support members is constituted by a fixed block for fixing on the pedestal, and a movable block loaded on the fixed block, and an upper surface of the movable block. A work support surface that comes into contact with the lower surface of the work material, and the two blocks are slidably joined to each other by an arcuate concave sliding contact surface and a convex sliding contact surface that fit together. In this case, the angle of the workpiece support surface changes according to the angle of the lower surface of the workpiece to be bent when the movable block is pressed by the pressing element.

In addition, a spacer is interposed between the pressing element and the pressing element, and the pressing element is moved so that the end of the pressing element is floating with respect to the pressing element. It is preferable that the angle of the presser changes in accordance with the angle of the upper surface of the material to be bent when pressed by the presser, and the material to be bent is fed to the tip side according to the process. Preferably, the portion to be processed slides.

Another feature of the present invention is that it comprises a pair of support members provided on a receiving stand at an interval, and a pressing element supported by a pressing slider above the supporting members. In the bending apparatus in which the material to be bent is placed over both support members and the upper surface of the material to be bent is pressed with a pressing element, the support members are fixed on the receiving table. And a movable block loaded on the fixed block, the upper surface of the movable block is provided with a workpiece support surface that comes into contact with the lower surface of the workpiece to be bent, and The blocks are slidably joined to each other by an arcuate concave sliding contact surface and a convex sliding contact surface fitted to each other, and the movable block adjusts the angle of the lower surface of the material to be bent when pressed by the pressing element. Follow the corner of the workpiece support surface There is that but was to change.

[0008] A spacer is interposed between the pressing element and the pressing element, and the pressing element is moved so that the end of the pressing element is floating with respect to the pressing element. Installed in
It is preferable that the angle of the presser changes so as to follow the angle of the upper surface of the material to be bent when pressed by the presser.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a bending method and an apparatus according to the present invention will be described with reference to FIGS.

In the drawing, reference numeral 2 denotes a press machine, 3 denotes a presser, 4 denotes a pedestal, 5 denotes a support member, and 6 denotes a square tube-shaped material to be bent.

The press machine 2 includes a base 8 forming a base of the press machine 2 and a pressing slider 9 facing the base 8.
, And pressurizing cylinders 10 that support the pressurizing slider 9 so as to be vertically movable.

The pressing element 3 is formed in a substantially rectangular parallelepiped block shape, and on the lower surface, a pressing surface 11 for pressing the upper surface of the material 6 to be bent is formed in an arc shape. 6 is slightly smaller than the processing target radius. Further, plate-like regulating plates are provided upright on both sides in the circumferential direction of the pressing surface 11 to form holding grooves 11b, and regulate the movement of the material to be bent in a direction other than the longitudinal direction at the time of pressing. At the upper end of the presser 3, a flat mounting plate 3a is formed integrally with the presser.

As shown in FIG. 5, a holding member for holding a central portion of the mounting plate 3a with a plate-like spacer 12 long in the front-rear direction interposed between the pressing member 3 and the pressing slider 9. Is screwed to the pressure slider 9 and the pressure slider 9
The presser 3 is attached to the lower surface of the pressurizing slider 9 with both ends of the presser 3 floating.

The cradle 4 is formed in a block shape, and is fixed on the base 8 such that the longitudinal direction thereof coincides with the longitudinal direction of the presser 3. A pair of supports 5 and 5 are provided on the upper surface of the cradle 4 at intervals so as to support the material to be bent at a position corresponding to the pressing element 3.
The interval between them is determined in consideration of the processing target radius of the material to be bent 6 and the like.

As shown in FIG. 3, the support member 5 includes a fixed block 13 for fixing the support member 5 to the receiving table 4, and a movable block 14 mounted on the fixed block 13.

The fixed block 13 is formed in a block shape from a steel material. A concave sliding contact surface 15 concaved in an arc shape is formed on the upper surface of the fixed block 13, and flange portions 16, 16 are projected from a lower end portion in a horizontal direction. The regulating rod 18 provided with
6 is installed vertically. Also, fixed block 1
Reference numeral 3 is fixed to the receiving base 4 by welding or bolting.

The movable block 14 is formed of a steel material into a block shape. On the lower surface of the movable block 14, an arc-shaped convex sliding contact surface 1 fitted with a concave sliding contact surface 15 is provided.
9. On the upper surface, a planar workpiece support surface 20, and a plate-like positioning plate 14a that is provided upright on one or both of the side portions of the workpiece support surface 20 are formed. In addition, the movable block 1
Slightly below the front and rear surfaces of 4, there are provided slide restricting portions 22, 22 having elongated holes 21 in the sliding direction at positions corresponding to the restricting rods.

The concave sliding contact surface 1 of the fixed block 13
By joining the convex sliding contact surface 19 of the movable block 14 to the upper surface 5, the movable block 14 can be slid in the circumferential direction with each other.
By screwing a nut 23 or the like onto the nut, movement in directions other than the circumferential direction is restricted, and the slidable range is also restricted in the circumferential direction. Note that the fixed block 13 is horizontally
The fixed block 13 may be fixed to the cradle 4 with one end of the fixed block 13 raised as shown in FIG. 14 can follow a wide range.

Next, the bending method according to the present invention will be described.

First, a rectangular tube-shaped material to be bent 6 is placed over a pair of supporting members 5 and 5 which are provided on the receiving table 4 at a distance from each other, and thereafter, the both supporting members 5 and 5 are placed. The pressurizing element 3 presses the upper surface of the material 6 to be bent between them.

At this time, as shown in FIG.
The movable block 14 follows the bending angle of the lower surface of the workpiece 6 so that the workpiece support surface 20 on the upper surface is in contact with the lower surface of the workpiece 6 on the fixed block 13 along the circumferential direction. Slide.

When the pressing is advanced and the pressing element 3 is pushed in and a load is applied to the edge portions 11a of the pressing element, the pressing element is supported by the spacer 12 and the upper surface of the material to be bent is formed. Following the above deformation, the angle of the pressing element 11 changes and the material to be bent is pressed on the entire pressing surface, so that stress is always applied to the entire pressing surface.

When the pressurization is released, the material 6 to be bent is restored to some extent, so that the movable block 14 slides while the work supporting surface 20 is in contact with the lower surface of the material 6 to be bent, following the restoring behavior. Move.

Then, pressure is applied again, and this operation is repeated until a desired radius of curvature is obtained.

Next, depending on the processing shape, the material to be bent 6
Is sent out in the direction of the tip, and the above-described bending process is performed while changing the portion to be processed.

In the above-described embodiment, the case of processing a metal square tube material has been described. However, a plate-shaped material, an H-shaped steel, or the like can also be processed. Processing can be performed by forming the material support surface 20 and the pressing surface 11 of the pressing element 3 in contact with each other at a surface that fits with the outer shape of the cylinder.

In the above embodiment, the fixed block 1
3, the concave sliding contact surface is formed on the upper surface of the fixed block 13, and the concave sliding contact surface is formed on the lower surface of the movable block 14. Is also good.

Further, smoother behavior can be expected by interposing lubricating oil at the joint between the concave sliding contact surface 15 and the convex sliding contact surface 19.

[0029]

According to the present invention, the material to be bent is placed over a pair of support members provided at an interval on the receiving table, and the upper surface of the material to be bent is pressed between the two support members with a pressing element. In the bending method of cold-bending the material to be bent by pressing, each of the support members is constituted by a fixed block fixed on the pedestal, and a movable block loaded on the fixed block, The upper surface of the movable block is provided with a workpiece support surface that comes into contact with the lower surface of the workpiece, and the two blocks are mutually connected by an arcuate concave sliding contact surface and a convex sliding contact surface that fit together. By slidably joined, the movable block, the angle of the workpiece support surface changes so as to follow the angle of the workpiece lower surface when pressed by the pressing element,
The material to be bent can always be supported on the surface, preventing stress from being concentrated at one place, obtaining suitable deformation, and being able to be processed by cold working, without the need for heat treatment etc. It can be processed at low cost.

Further, a spacer is interposed between the pressing element and the pressing element, and the pressing element is moved so that the end of the pressing element is floating with respect to the pressing element. The angle of the presser changes according to the angle of the upper surface of the material to be bent when pressed by the presser, so that the load applied to both ends of the presser when pressed is increased. The pressing element can also always press the surface of the material to be bent with a surface, thereby preventing concentration of stress and obtaining suitable deformation.

Further, by feeding the material to be bent toward the front end side in accordance with the process and sliding the portion to be processed, there is no need to reload the material to be bent in each process, thereby enabling efficient processing. It is possible to cope with a case where the processing target radius is large.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a bending apparatus according to the present invention.

FIG. 2 is a vertical cross-sectional view showing the same pressurized state.

FIG. 3 is a front view showing a support member in FIG. 1;

FIG. 4A is a front view showing the pressing element in FIG. 1, and FIG.
Is a side view, and (C) is a bottom view.

5 (A) is a front view showing an attached state of the pressing element in FIG. 1, FIG. 5 (B) is a side view thereof, and FIG. 5 (C) is a bottom view thereof.

FIG. 6A is a plan view showing a fixed block in FIG. 3;
(B) is the same front view, (C) is the same side view.

FIG. 7A is a plan view showing a movable block in FIG. 3;
(B) is the same front view, (C) is the same side view.

FIG. 8 is a schematic diagram showing a conventional example.

9A is a cross-sectional view showing a member before processing, and FIG. 9B is a cross-sectional view showing a deformed state of a member processed by a conventional processing method.

[Explanation of symbols]

 Reference Signs List 2 Press machine 3 Presser 3a Mounting plate 4 Receiving stand 5 Support member 6 Bending material 8 Base 9 Pressing slider 10 Pressing cylinder 11 Pressing surface 11a Edge 12 Spacer 13 Fixed block 14 Movable block 15 Recessed sliding contact Surface 16 Flange 17 Screw thread 18 Restriction rod 19 Convex type sliding contact surface 20 Workpiece support surface 21 Slot 22 Flange 23 Nut

Continued on the front page (72) Inventor Daijiro Tomita 173 Uehongo, Matsudo-shi, Chiba F-term in Tomita Manufacturing Co., Ltd. (reference) 4E063 AA04 AA08 BA03 GA01 MA02

Claims (5)

[Claims] 1. A material to be bent is placed over a pair of support members provided at intervals on a receiving stand, and the upper surface of the material to be bent is pressed by a pressing element between the two support members. In the bending method in which the material to be bent is cold-bent by pressing, each of the support members is constituted by a fixed block fixed on the receiving table, and a movable block loaded on the fixed block, An upper surface of the movable block is provided with a workpiece support surface that is in surface contact with the lower surface of the workpiece, and
The two blocks are slidably joined to each other by an arcuate concave sliding contact surface and a convex sliding contact surface fitted to each other, and the angle of the lower surface of the material to be bent when the movable block is pressed by the pressing element. The bending method characterized in that the angle of the support surface of the workpiece is changed according to the following. 2. A pressurizing slider, wherein a spacer is interposed between the presser and the pressurizing slider so that an end of the presser is floating with respect to the pressurizing slider. Installed on the child,
2. The bending method according to claim 1, wherein the angle of the presser changes according to the angle of the upper surface of the material to be bent when the presser presses. 3. The bending method according to claim 1, wherein the material to be bent is fed to the front end side in accordance with the step, and the portion to be processed slides. 4. A pair of support members provided on a receiving stand at a distance from each other, and a presser supported by a pressurizing slider above the support members, bridging the support members. A bending block for placing the material to be bent and pressing the upper surface of the material to be bent with a pressing element, wherein each of the supporting members is fixed on the receiving table; and A movable block loaded on a fixed block, comprising a workpiece support surface on an upper surface of the movable block, which is in contact with a lower surface of the workpiece to be bent, and
The two blocks are slidably joined to each other by an arcuate concave sliding contact surface and a convex sliding contact surface that are fitted to each other, and the movable block has a lower surface of a material to be bent when pressed by the pressing element. A bending apparatus characterized in that the angle of the workpiece support surface changes according to the angle. 5. A pressurizing slide with a spacer interposed between the presser and the pressurizing slider so that an end of the presser is floating with respect to the pressurizing slider. Installed on the child,
The bending apparatus according to claim 4, wherein the angle of the presser changes according to the angle of the upper surface of the material to be bent when the presser presses.