JPS6029572B2 - Straight-stretch irregular-shaped piece forming method and its equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of bending and forming a metal strip using a rotating piece to efficiently manufacture a tube or a profiled member having a complicated shape regardless of the presence or absence of bends and curvature in the longitudinal direction, and the method thereof. It is related to the device.

In the conventional cold rotary piece forming method, as a fate of this processing method, multidirectional strain occurs in the metal strip, especially in the twill portion, and the formed product has wrinkles 1 and waves as shown in Fig. 1a and b. 4
Such defects were likely to occur, and when multidirectional strain occurred in the center portion in the width direction, bulges, dents 3, etc. were likely to occur.

These problems were particularly noticeable when forming soft materials (European steel materials, aluminum materials, etc.) with a large ratio of thickness to product height, or thin sheets. When molding a product that is straight in the longitudinal direction of the product, the edges that are unique to cold piece molding become elongated, and the formed strip tends to warp with a concave center side in the width direction. Therefore, it is relatively easy to create a warp or refraction in the direction in which the center part in the width direction is concave, but it is necessary to create a warp or bend in another direction, for example, in which the green part is concave and the center part is convex. Manufacturing the product is extremely difficult due to its characteristics. Furthermore, even when manufactured, defects such as bulges and wrinkles as shown in FIGS. 1a and 1b cannot be avoided. The present invention is an invention of a method and apparatus for solving these defects and manufacturing products efficiently and at low cost.

Therefore, before forming or during the traveling forming process, compressive force is applied to the portion of the metal strip excluding both green portions from the front and back to cause elongation deformation in the longitudinal direction, thereby reducing distortion of the green portion of the metal strip. This is a forming method that enables the forming of thin plates or soft materials by equalization, and a forming apparatus that is provided with a compression deformation piece device having a rolling action as a compression force applying means. This makes it possible to manufacture products with free bending, bending, and warping in the longitudinal direction, which was previously difficult, as well as increasing the degree of freedom in designing the shape of the piece hole mold part and arranging the pieces. . Figures 2 to 4 illustrate the magnitude of strain that should be applied to deform the metal strip in the longitudinal direction in order to perform the forming according to the present invention. That is, Fig. 2 c, d, e, f
Figures g, h, i, and i in Figure 3 show the amount of strain required to form a product that is symmetrical with respect to the center line in the width direction of the metal strip, and Figure 4, k, 1, and m. , n indicates the magnitude of distortion necessary for molding a product that is asymmetrical with respect to the center line. FIG. 5 is an example of a compression deforming piece device for deforming a metal strip before forming or during a traveling forming process. 5 and 6 are compression deformation pieces, which are rotationally driven via drive shafts 9 and 10 by drive devices 7 and 8 driven by a prime mover (not shown), and apply a rolling action to a portion of the material to be formed 14 excluding both twill portions. give.

11 and 12 are reduction stands, and drive shafts 9, io
Adjust the interval.

The upper and lower compression deformation pieces 5 and 6 are attached according to the compression deformation piece hole mold whose deformability is set in advance, and the amount of deformation is adjusted to effect a predetermined deformation. FIG. 6 is a front view of an embodiment of the irregular-shaped piece forming apparatus according to the present invention, and 15 and 16 are compressed irregular-shaped pieces for deforming the metal strip. As mentioned above, conventionally, when forming cylindrical or irregularly shaped products using thin metal strips and soft materials, it is impossible to use rotating pieces to form products, so press bending, deep drawing, etc. are used to form products. As a result, efficiency, productivity, material yield, etc. were poor, and large costs were required for equipment costs, mold costs, etc., but the present invention solves these drawbacks.

That is, by controlling the unnecessary magnitude of distortion that occurs during molding and its distribution, and causing an appropriate strain state in the metal strip, it is possible to improve the shape accuracy of the molded product. In addition, the range of material selection for the metal strip is widened, and a product that is durable enough for the intended purpose can be obtained using inexpensive materials. Furthermore, it eliminates unnecessary residual strain, prevents permanent deformation after molding, and improves the physical and mechanical properties of materials and products.

[Brief explanation of the drawing]

Figures 1a and b are cutaway perspective views of the tube and the irregularly shaped product, Figures 2c to d, Figures 3g to i, and Figures 4k to n, respectively, show the amount of strain in the deformed strip. FIG. 5 is a front view of a compressed deformed piece molding machine, and FIG. 6 is a front view of a cold direct stretching rotary piece forming apparatus. 5, 6: Compressed irregularly shaped bed 14: Metal band plate, 15, 16: Compressed irregularly shaped piece device. Figure 2, figure 3, figure 4, figure 4, figure 5

Claims (1)

[Scope of Claims] 1 A metal strip is continuously passed between irregularly shaped pieces whose cross section perpendicular to a rotating axis is circular, and is cold bent and formed into a cylindrical or irregularly shaped piece. In the cold piece forming method for producing metal strips, compressive force is applied from the front and back to the parts of the metal strip excluding both edges in the width direction before forming or during the running forming process to cause elongation deformation in the longitudinal direction. A method for forming odd-shaped pieces of thin sheets or soft metal strips that makes it possible to manufacture cylindrical or irregularly shaped products by equalizing the distortion at the edge of the plate. 2. A cold piece that manufactures cylindrical or irregularly shaped materials by continuously running and cold bending a metal strip between irregularly shaped pieces whose cross section perpendicular to the rotating shaft is circular. In a forming device, one or more compression deformation piece devices are installed that apply a rolling action to the parts of the metal strip excluding both edges from the front and back of the strip and stretch and deform the strip in the longitudinal direction. An apparatus for forming odd-shaped pieces of metal strips made of thin plates or soft materials, characterized by: