JPS6061119A - Method and device for cold forming shape material - Google Patents

Abstract

PURPOSE:To remove the deformed strain produced in the inside of a shape material at the time of forming by forming the material into a bent angle larger than a prescribed shape by the rolls located before the forming rolls of final stage and restoring it thereafter to the prescribed shape by the rolls of final stage. CONSTITUTION:When crosswise moving shafts 4, 5 are rotated, the lower parts of rolls 13, 14 are moved in the axial directions of shafts 4, 5 to change and set the mutual distance between the rolls 13, 14. Further, the rolls 13, 14 are moved and set while keeping their angles as they are, because stands 8, 9 are fixed to female-threaded blocks 6, 7. After setting the rolls 13, 14 by conforming the mutual distance between them to the base dimension of a product, the rolls 13, 14 are slantly set when holders 19, 20 are moved by rotating adjusting shafts 17, 18, because the bottom ends of rolls 13, 14 are pivotally fixed to the blocks 6, 7. In this way, both rising parts of a material 21 to be worked are bent by the same slant angle as those of rolls 13, 14.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cold-open forming method for forming a section from a strip material, and more particularly to a cold-open forming method for forming a section that eliminates deformation distortion inside the section that occurs during forming, and an apparatus therefor. .

Conventionally, lightweight sections have generally been manufactured by cold-open forming, or roll forming, strips of material, but in this case, the dimensional accuracy of the product can be improved, but internal deformation distortions during forming remain. However, if necessary, annealing and other treatments must be performed, and if post-processing such as cutting is performed in that state, the distortion of the cut end will be restored and the product will become deformed. For example, when it is applied to automatic processing equipment, it has the disadvantage that it causes problems such as being referred to by the equipment. First, an example of this phenomenon will be briefly explained using figures. Fig. 4 is a partial perspective view showing an example of a section formed by the method of the present invention, and Fig. 5 is a partial perspective view showing an example of a section formed by the conventional method. A partial perspective view of a similar section with post-processing notches for cutting holes,
Fig. 6 is a front view of a roll block at one stage of the multistage rolls that form the workpiece, and Fig. 7 is a cross section for explaining the bending shape at an intermediate stage of the bending and forming process of the workpiece. The schematic diagram and FIG. 8 are explanatory diagrams for explaining the forces acting on each part during bending and forming processing on the workpiece, and 30 in FIG. It is formed by bending. The conventional profile 30' is the sixth
As shown in the figure, a strip material 33 is passed between a lower roller 31 and an upper roller 320, each having a bent surface bent at a bending angle β on both sides with respect to a horizontal portion, and the bending angle is set at a seventh angle.
As shown in Figures (a) to 2), from 180 degrees to approximately 9 degrees
It is formed by folding roll blocks 34 set in multiple stages so as to form an angle of 0 degrees.

Although the rolls 31, 32 are shown in principle in FIG. 6, in reality, each roll 31, 32 is suitably equipped with a plurality of pressure rollers so as to press against each other.

By the way, when the strip material is sequentially bent and raised on both sides by the forming rolls 31 and 32, the part to be processed is as shown in FIG. Assuming that the end face 34A shown in the same figure (A) is to be molded in the shape of the end face 34B shown in the same figure (C) in the B part, both ends are separated by a height of a between A and B. When trying to stand up, apply external force to part B with arrows X and x.
This means that it is being shaped while being fed. In this case, external forces X, stresses Y in response to X are generated internally between A and B, so if the plate 34 is a continuous body moving in the traveling direction C, the traveling direction at point B is A bending force due to an external force acts on the front side of the holder, and a stress corresponding to the bending force acts on the rear side of the holder. Therefore, it is considered that the shape after molding is in a state where the bending force and stress are balanced at each point. Therefore, in accordance with the above-mentioned conventional method, the strip material 33 is sequentially bent using forming rolls, and, taking springback into account, the final material has a U-shaped cross section, similar to the shape material 30 shown in FIG. When a material 30' is obtained, the shape material 3
0' is cut with a cutter to cut it at the required part as shown in FIG. As a result, the rear side 30'b is warped inward, and the cut 35 is deformed. Therefore, such a profile with a deformed cut end face can be processed using an automatic drilling machine, for example.
When processing, assembling, etc. is performed using an automatic processing device such as an automatic assembly device, there is a drawback that the deformed cut 35 may get caught in the device and become an obstacle to the processing operation.

In view of the above-mentioned drawbacks, the present invention has been developed in such a way that when cold-forming a shape from a strip material, it is bent to a predetermined shape, then further bent by a predetermined amount, and then returned to the predetermined shape. To provide a cold forming method for a shaped material and an apparatus therefor, which eliminates stress etc. during bending by rolls and prevents deformation of the machined surface even after cutting or other post-processing. That is.

The method of the present invention and the apparatus directly used for carrying out the method will be described in detail below based on the drawings. FIG. FIG. In FIG. 1, 101 is an excess folding roll block, 102 is its bottom roll,
The surface of the roll 102 is entirely smooth,
Side rolls 103 and 104 are arranged at both upper end portions of the side rolls 103 and 104 so as to be inclined at acute angles in directions facing each other, and each roll 10
2. A workpiece 105 is guided through the inner surfaces of 103 and 104.

According to the method of the present invention, similarly to the conventional folding method described above, folding roll blocks 34 as shown in FIG. The processed material (105) is sequentially bent so that the angle β is approximately 90 degrees, and then the roll block 1 shown in FIG.
01, it is bent so that the bending angle becomes an acute angle.

This acute angle is preferably about 80 degrees to 75 degrees, although it depends on the material, plate thickness, processing dimensions, etc. Further, when the angle is bent from 90 degrees to the deepest acute angle, the number of steps of the roll block 101 whose angles are sequential may be set to about 1 to 4 steps depending on the conditions of the material to be processed. After that, the angle is returned again, and in this case, finally, taking springback into consideration, (β) is set to about 92 degrees, and the bending process as a shape material is completed. In the case of this return as well, the set number of stages of the roll block is determined depending on the material to be processed, but it may generally be smaller than in the case of the above-mentioned excessive bending.

Also, at least the first stage of the return roll block is
The rolls 103 and 104 shown in the figure are arranged together inside the rising parts on both sides of the workpiece, and the final stage roll block has the same configuration as the roll block 34 shown in FIG. It is preferable to use a roll block that restricts both the inner and outer surfaces of the material.

Incidentally, although it is thought that the required number of stages of the roll block during the above-mentioned bending process varies considerably depending on the distance between the upper and lower centers of the working rolls, the standard set number of stages is shown below.

When the profile 30 shown in FIG. 4 is formed using the cold-open forming apparatus according to the present invention with a roll pitch dimension of 450 mm and a roll center distance dimension of 160 mm, the length of the base of the profile 30 is b1.
If plate thickness is human and b/ is -N, then when it is less than N-20 When 1st stage N = 20 or more and less than 40 When 2nd stage N = 40 or more and less than 60 When 3rd stage N = 60 or more 3 to 4 When viewed from the relationship with the elongation rate of the step and workpiece material, the elongation rate
When it is less than 20% When the first stage is 20 inches or more and less than 30 inches When the second stage is 30 or more and less than 40 inches When the third stage is 40 inches or more It is preferable to use four stages.

Next, a specific embodiment of the roll block shown in FIG. 1 will be explained. FIG. 2 is a front view of the main part showing a part of an embodiment of the roll block of the cold-open forming apparatus according to the present invention as a cross section. FIG. 3 is a side view of the embodiment shown in FIG. 1 is a roll block, and a support box 2 assembled appropriately is
It is fixed in place by an L-shaped fixing plate 3.31. Cross moving shafts 4 and 5 are rotatably disposed in parallel on both sides of the box 2 in the longitudinal direction, with one end of each projecting outside the box 2.
It constitutes the handle attachment parts 4a and 5a, and also includes the scale drum 4b.
, 5b are arranged. On the other hand, the shafts 4 and 5 have male threads formed in each half on opposite sides. The male thread of each shaft 4.5 has a female thread block 6.
7 are screwed together, and stands 8 and 9 are fixedly attached to the block 6.7 by protruding above the box 2, and shafts 4 and 50 are mounted on opposite sides of the box 2, respectively.
10.11 is pivoted at its lower end. When the block 6.7 moves, the central axis of the shaft 10.11 is located at an intermediate position between the cross-moving shafts 4 and 5 (9), and the shafts 10.11 are attached to each block 6.7 so that they move on parallel and coincident trajectories. ing. The shaft 10.
11 is provided with rolls 13 and 14 rotatable via bearings 12 in their intermediate parts, and the upper ends of the shafts 10 and 11 are screwed into the upper ends of the stands 8 and 9. The holder 1 is attached to one end of the adjusted shaft 17.18.
9.20. 15 and 16 are +h nuts. The other ends of the shafts 17, 18 are formed with nondle mounting portions 17a, 18a, and a scale drum 17b,
18b is provided.

Thus, according to the roll block 1 described above, the cross-moving shafts 4, 5 can be rotated by attaching handles to the nondle attachment parts 4a, 5a, or alternatively, the adjustment shafts 17,
By rotating 18 in the same way, both shafts 10, 11 can change their mutual spacing and their inclination. That is,
According to the cross movement shaft 4,50 rotations, roll 13
．． The lower part of the roll 14 can be moved in the axial direction of the shafts 4 and 5 to change and set the mutual spacing between the rolls 13 and 14.
10) At this time, since the stands 8 and 9 are fixed to the female screw block 6.7, the rolls 13.14 are set to move at the same angle. After setting the mutual spacing between rolls 13 and 14 according to the bottom dimension of the product, adjust the shirt)
17. Holder 19. which rotates 18 and screws into them.
If 20 is moved, shirts 10 and 11 will tilt around that pivot point, since their lower ends are pivoted.
As a result, the rolls 13,14 are tilted. Tighten the bolts 15 and 16 at the desired setting to secure. Therefore, if the rolls 13.14 are set so that their upper sides are close to each other as shown by the dashed line in FIG.
Similarly to 4, it is bent at an inclination (-) angle.Thus, depending on the conditions of the workpiece 21 and the molding shape, the cross moving shaft 4.5 and the adjustment shirt 17 and 18 can be adjusted and set as appropriate. good. In addition, the scale drum 4b.

(1f) Alternatively, it may be a drum with only a main scale, or may be a drum with a vernier, and the scale may be a moving dimension display or an angle display. Also, the connection between the shaft 10.11 and the holder 19゜20 using a pin is as follows.
One side is connected by a long hole. Furthermore, in this case, each handle attachment part 4a, 5a of the shaft 4, 5° 17.18,
For 17a+18a, it is preferable to remove the handles except when making adjustments. Moreover, the present invention is of course applicable not only to the U-shaped cross section of the above-mentioned embodiment, but also to other shapes such as L-shape and Z-shape.

As described above, according to the method of the present invention, by simply bending the strip material to a predetermined shape or more and then returning it to the predetermined shape, there is no internal forming distortion of the workpiece material during the bending process. Even if post-processing such as cutting is performed, the distortion of the cut end will not be restored and deformed, which will cause problems during subsequent assembly and processing, especially when processing with automatic equipment. Never. Furthermore, the apparatus according to the present invention for carrying out such a method is suitable for bending (12
) Since it is sufficient to bend at least the ordinary rolls of the multistage forming rolls into a predetermined shape or more, the structure is extremely simple and suitable for mass production.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the basic configuration of an apparatus for excessively bending a workpiece by the method of the present invention, and Fig. 2 shows a part of an example of a roll block of the cold-open forming apparatus according to the present invention. 3 is a side view taken in the direction of arrow E in FIG. 2, FIG. 4 is a partial perspective view showing an example of a shaped material formed by the method of the present invention, and FIG. 5 is a conventional cross-sectional view. A partial perspective view of a shape similar to that shown in Fig. 4 formed by the same method as shown in Fig. 4 after cutting notches, and Fig. 6 is a front view of a roll block in one stage of the multi-stage rolls that form the workpiece. Figure 7 is a schematic cross-sectional view of the workpiece to explain the bending shape in the middle of the bending process, and Figure 8 is a diagram explaining the forces acting on each part during the bending process on the workpiece. It is an explanatory diagram of a sudame. (13) Roll block for i, toi..., 4,5...
・Cross movement shaft, 1o, 11... shaft, 13.14, 103, 104... roll,
17.18・・・Adjustment shaft, 21,33°3
3', 34, 105... Work material, 3o...
...shape. Applicant Muku 1) Pei (14)

Claims (1)

[Scope of Claims] (1) In a cold-open forming method in which a strip material is sequentially bent at large bending angles along the longitudinal direction through multiple forming rolls to form a predetermined shape, the final stage Cold forming of a shaped material, characterized in that it is once bent to a bending angle of more than a predetermined shape using a forming roll at a stage before the forming roll, and then returned to the predetermined shape by a forming roll at the final stage. Law. ■) In a cold-open forming apparatus that bends a strip material to a predetermined shape by sequentially bending the strip material at large bending angles along the longitudinal direction through multiple forming rolls, one of the multi-stage forming rolls is 1. A cold-opening forming device for a shaped material, comprising a forming roll that bends the material to a bending angle greater than a predetermined shape. (3) The cold-opening forming apparatus for a shaped material according to item 2, wherein the forming roll that is bent into a predetermined shape or more has an adjustable bending angle. (4) The cold-opening forming apparatus for a shaped material according to item 2, wherein the forming rolls for bending into a predetermined shape or more include a pair of forming rolls whose mutual spacing is adjustable.