JPS5928412B2 - Tools for bending workpieces such as pipes and shapes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tool used in a bending machine for bending workpieces such as pipes and profiles.

Conventionally, various forms of tools have been known as tools used in bending machines to bend workpieces such as pipes and sections, but generally these tools are fixedly arranged and can be bent as desired. a first mold member having a shape of , and a second mold member having a desired shape that is reciprocatably installed on an installation stand (Japanese Patent Publication No. 31-5065 and Utility Model Publication No. 46-237).
(See No. 29).

The tool for bending a workpiece as described above has the following problems.

First, in the conventional tool for bending a workpiece as described above, the first mold member and the second mold member can only bend the workpiece into one type of shape.

To bend into other shapes, the mold members must be replaced. For this purpose, it is necessary to remove the first mold part and the second mold part from the installation part. This replacement work takes a relatively long time. Second, for example, when a relatively long workpiece is bent using a conventional workpiece bending tool as described above, the following problem occurs.

First, when bending a long mold member all at once, the force is dispersed and the force acting on each part becomes weak, making it impossible to properly bend a hard workpiece. On the other hand, when trying to sequentially bend each part using a large number of mold members, positioning them becomes troublesome. The present invention has been made in view of the above situation.

The main object of the present invention is to provide a tool for bending workpieces such as pipes and shapes, which allows easy and convenient processing of a variety of workpieces.

According to the invention, the above-mentioned and other objects are achieved in a tool for bending workpieces such as pipes, profiles, etc., which are arranged spaced apart from each other and pivotable about an axis perpendicular to the bending plane. a pair of pressure countering members; a bending member disposed so as to be able to reciprocate between an extended position and a retracted position; and a bending member having one surface formed with a desired curvature; a connecting member for connecting the workpiece on the side thereof, and a die member for positioning the workpiece between the surface of the side and the pair of pressure countering members, the protruding position of the bending member during movement, the bending member forces the mold member toward the pair of pressure countering members such that the one surface of the mold member and the pair of pressure countering members bend onto the workpiece. By providing a tool, characterized in that when a force is applied and the bending member is in a retracted position, the mold member is able to move in the space between the bending member and the pair of pressure countering members. achieved.

Next, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

First, a bending machine capable of incorporating a tool for bending a workpiece according to the present invention will be described with reference to FIGS. 1 to 4. FIG.

This bending machine is equipped with a ram 1 whose stroke is fast and continuous.

This ram 1 is composed of an elastic rubber block 2. This ram acts on the pressure plate 3 and therefore, via the inclined surface 3' of this pressure plate 3, on a pair of clamping plates 4 and 5, which are arranged one above the other under the soil, in a manner synchronized with the working cycle of the machine. Granted forward movement. Upper clamp plate 4 is pressure plate 3
It has an inclined surface 4' extending in the same direction as the inclined surface 3' of. These plates 3, 4, and 5 are all disposed within a holder 6 and are installed to be movable vertically or horizontally. A cavity 7 is formed between the upper clamping plate 4 and the lower clamping plate 5, which accommodates the cross-section of the workpiece to be bent, in the illustrated case a box-shaped cross-section 8.

In the bending machine illustrated in FIGS. 1 to 3, the upper cavity 7 is bounded by a downwardly extending wall portion 9 of the soil clamping plate 4 and an upwardly extending wall portion 10 of the lower clamping plate 5. stipulated. The holding body 6 is provided with outwardly projecting holding plates 11 on both sides thereof, on which a pressure countering member 12 is rotatably mounted. In the bending machine shown in FIG.
The end walls of the clamp plates 4 and 5 that define the above are respectively formed by an end wall part 16 screwed to the lower surface of the upper clamp plate 4 and a wall member 16 screwed to the upper surface of the lower clamp plate 5. There is.

Next, the operating mode of the above-mentioned bending machine will be briefly explained.

The ram 1 performs a short stroke reciprocating motion to apply thrust to the pressure plate 3. In a first step, the box-shaped section 8 is clamped between the clamping plates 4 and 5 by lowering the pressure plate 3. Then, in the second step, the clamp plates 4 and 5 are moved in the bending direction A, and the box-shaped section 8, which is clamped between both clamp plates and pressed against the wall part 9 (buckling surface), is transported by both clamp plates. It will be bent by the resistance force exerted by the pressure countering member 12. In this mode of operation, a gap 13 is provided in the plane between the lower surface of the upper clamping plate and the upper surface of the lower clamping plate, providing a range of movement. The two clamp plates are connected by a pin and are equipped with an elastic rubber pad 14 and the like.

When the pressurizing stroke is completed, the two clamp plates instantly return to their initial positions by spring action. In order to obtain the same bending radius, it is possible to limit the movement in the bending direction A by means of a set screw 15. The bending machine shown in FIG. 4 has the advantage that by inserting a suitable end wall 16 it is easy to make it possible to use the tool for various cross-sectional shapes. .

The tool for bending a workpiece according to the present invention is obtained by slightly modifying the design of the bending machine as described above, if necessary.
Make use of it.

The tool for bending workpieces of the present invention is suitable for bending various cross-sectional shapes shown in FIGS. 5-8.

FIG. 5 shows the tube 20, and FIG. 6 shows the box-shaped cross-section member 2.
1, FIG. 7 shows a silk pad-like cross-sectional member 22, and FIG. 8 shows a cross-sectional member 23 having a plurality of belly plates. Each pressure counter member 30, 31, 32, 3
3 is designed to fit these cross-sectional shapes. A tool for bending a workpiece according to a preferred embodiment of the invention will now be described with reference to FIGS. 9, 9a, 10 and 10a.

In the embodiment shown in FIGS. 9 and 9a,
A curved bucking surface 113 is secured to the workpiece 108 by a catch 116.

Workpiece 108 along with section 114 is moved through the tool in stages. In the embodiment shown in FIGS. 10 and 10a, bends with different radii of curvature are applied to a single workpiece 108.

To provide this bending without requiring repositioning of the ram, portion 114' with bucking surface 113' is
The thickness changes as shown. The tube or section can be moved forward through the mechanism, either manually or mechanically, typically in approximately synchronization with the working cycle of the machine each time the ram performs an idle stroke. If it is bent, it is given a backward movement to perform the bending process. With this tool, it is also possible to withdraw the workpiece from the tool in a stepwise manner, especially if the workpiece is to consist of straight sections.
It is possible to bend a tube or other hollow cross-section member with or without a filler core therein. As described above, in the tool for bending a workpiece according to the present invention, a desired curvature is formed on one side of the mold member, e.g., the section 114, and the workpiece is attached to the connecting member, e.g., the stopper 116, on one side. They are then connected.

Therefore, as mentioned above, during the bending process, the workpiece moves with the mold member. Movement of the bending member, for example, the clamp plate 104 to the protruding position (clamp plate 1 in FIGS. 9 and 10)
04), the bending member forces the mold member toward the pair of pressure counter members 112, and one surface of the mold member and the pair of pressure counter members 112 exert a bending force on the workpiece 108. Add. When the bending member is in the retracted position (i.e., when the clamp plate 104 is in the lower position in FIG. 9)
, the mold member can move in the space between the bending member and the pair of pressure countering members 112. This allows the workpiece to be bent by sequentially applying a bending force along one surface of the mold member. In addition, the mold member is a member that applies pressure, that is,
It is not connected to the bending member and pressure countering member 112.
Therefore, the mold member can be easily replaced, and various mold members can be used for processing with a set of pressure applying members. Furthermore, a workpiece 108 is connected to the mold member by a connecting member. For this reason, while the mold part moves air between the bending part and the pressure countering part, the mold part and the workpiece remain
The relative positional relationship with 08 does not shift, and accurate bending can be performed. The pressure counter member is then arranged so as to be pivotable about an axis perpendicular to the bending plane.
This allows the pressure countering member to abut the workpiece at a suitable angular position depending on the degree of bending of the workpiece.

[Brief explanation of the drawing]

FIG. 1 is a side view of a bending machine in which a tool according to the invention can be incorporated. 2 is a plan view of the bending machine of FIG. 1; FIG. 3 is a front view of the bending machine of FIG. 1; FIG. FIG. 4 is a vertical sectional view of a modification of the bending machine. 5-8 are vertical cross-sectional views of various shapes of workpieces, etc., for which the tool according to the invention can be utilized. Figures 5a to 8a show the fifth
9 shows a pressure countering member associated with the workpiece of FIGS. 9 and 10 show an embodiment of the tool of the invention. Figures 9a and 10a are partial cross-sectional views of the tool shown in Figures 9 and 10; 1...
・Ram, 3...Pressure plate, 4...Upper clamp plate, 5...Lower clamp plate, 6...
Holding body, 7...Cavity, 8...Workpiece,
11... Holding plate, 12... Pressure counter member.

Claims (1)

[Claims] 1. In tools for bending workpieces such as pipes and shapes,
a pair of pressure countering members 112 spaced apart from each other and pivotably arranged about an axis perpendicular to the bending plane;
, a bending member 104 arranged so as to be able to reciprocate between an extended position and a retracted position, and one surface 1
13, 113' are formed with a desired curvature, and have a connecting member connecting the workpiece 108 on the side of the one surface 113, 113', and the workpiece 108 is connected to the one surface 1.
13, 113' and a mold member 114, 114' positioned between the pair of pressure countering members 112, the bending member 104 being moved to the protruding position, Forcing the members 114, 114' towards the pair of pressure countering members 112, the mold members 114, 114'
when the one surface 113, 113' of the mold member 114 and the pair of pressure opposing members 112 apply a bending force to the workpiece 108 and the bending member 104 is in the retracted position.
114' is the bending member 104 and the pair of pressure opposing members 1;
A tool characterized by being able to move in a space between 12.