JPS5927248B2 - Rotating odd-shaped piece forming method and its device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method and method for efficiently and inexpensively manufacturing pipes, irregularly shaped materials, etc. of complex shapes, even when there are bends and curvatures in the longitudinal direction, by bending and forming metal strips with rotating pieces. This is related to the device.

In the conventional cold rotary piece forming method, it is the fate of this processing method that due to multidirectional strain occurring at the edge of the metal strip, the product has wrinkles 1, bulges 2, dents 3 and Defects such as waves 4 are likely to occur, and it has been impossible to form thin plates, especially those made of soft materials (mild steel, aluminum, etc.) with a large ratio between the plate thickness and the height of the product.

In addition, in the case of building materials with end faces as shown in Fig. 3, bicycle seats, cushioning materials for vehicles, etc., which have bends or curves in the longitudinal direction, the edges, which are unique to cold piece molding, become elongated, resulting in Approximately the center of the strip formed as shown in Figure 4 will be the mouth side. Fig. 5a shows that even if an attempt is made to manufacture a product with this cross-sectional shape that is straight in the longitudinal direction, the approximately central part of the strip will be on the mouth side, as shown in a. Also, Figure b shows a bend in one place on the mouth side in the longitudinal direction, and Figure c shows a bend in two places, so it is easy to add warps and bends to the mouth side. 5d, e and f are all cross-sectional shapes. This molding method can be used to create a product that adds refraction, bending, and warping in the opposite direction of FIG. 5, for example, as shown in FIG. Due to its characteristics, it was almost impossible. In order to solve these drawbacks, the present invention heats the approximately central part of the metal strip to raise the temperature and deform it in the longitudinal direction before forming and during the traveling forming process.
The purpose is to make cold piece forming of thin plates and soft materials possible by equalizing the distortion of the edge of the strip.

Figures 6a to 1 show examples of the method of the present invention, and j to 1 are the cross-sectional shapes thereof.

By heating the approximately center portions 5, 6, and T of the metal strip of g-i to equalize the strain on the edges 8 and 9 of the strip, it is possible to bend the strip in the opposite direction to the normal mouth side. , g is bending, and ri and i are bending plus refraction at one and two places. This makes it possible to manufacture products that are freely bent, bent, and warped in the longitudinal direction, which has been difficult in the past, and also allows combinations of the shape design of the piece hole mold section, the arrangement of pieces, local rolling, etc. On the other hand, by controlling the magnitude and distribution of unnecessary distortion during molding and creating an appropriate distortion state in the product, the shape and precision of the product will be improved, and the range of strip selection will be expanded. Cold piece molding is also possible with inexpensive materials that can withstand many uses. Furthermore, by applying heat, unnecessary residual strain can be removed, contributing to the prevention of permanent deformation after molding, and it is also possible to improve the physical and mechanical properties of the material and product. Conventionally, in order to manufacture products that meet these requirements, rotary piece molding is not possible, so they are manufactured using press bending, deep drawing, etc., resulting in poor efficiency, productivity, material yield, etc., and as a result, equipment Although molds and the like were expensive, the present invention has made it possible to produce them efficiently and at low cost.

FIG. 7 shows an embodiment of the cold rotary piece forming apparatus according to the present invention, in which numeral 10 indicates a forming portion and numeral 11 indicates a cutting uniform portion. The molded portion 10 is shown exaggerated because it is bent and warped. 12, 13 and 14 are molding rotary piece devices;
Heating devices 15 and 16 are arranged between these, and generate a predetermined strain approximately in the longitudinal center of the metal strip 17.

In this case, a heating device and a cooling device may be installed in combination to adjust distortion. FIG. 8 shows an example in which the heating method is electric heating methods 18 and 19 to improve the heating efficiency, the environment, and the heating efficiency. Since local heating efficiency is improved, adjustment becomes easier and productivity can be increased. Figure 9 M
, n are examples of heating with a torch. 20 is the board edge;
Due to the forming process of the metal strip, the edge 20 of the metal strip rises as it progresses in the direction of travel.

In this example, the temperature is increased only at the bottom surface 21 of the strip at approximately the center of the strip. If this temperature increase is not performed, permanent elongation deformation will occur in the strip edge 20 as it rises, and this tends to cause blisters, wrinkles, cracks, etc., but at the center of the strip where elongation deformation is less likely to occur. Since the temperature near the plate edge 20 is raised to equalize the elongation deformation of the plate edge 20, it is possible to prevent blisters, wrinkles, cracks, etc. after molding. It is also possible to add bending or warping in the longitudinal direction by increasing the amount of elongation at the center. 10th
The figure similarly shows an embodiment of the cold rotary piece molding apparatus of the present invention, 22, 23, 24, 25, 26 (not shown), 27,
28 and 29 are rotating piece stands, respectively. Rotating piece stands 22 and 23, rotating piece stands 24 and 25
, and further between the rotating piece stands 27 and 28 the torch 3
0, 31, and 32 to apply deformation equal to the amount of deformation of the edge of the metal strip 17 to approximately the center of the metal strip 17, the edge is successively bent as the metal strip 17 advances. It performs molding. Reference numeral 33 denotes a cooling device, and the cooling device 33 is provided to ensure the molding of the molded product.

FIG. 11 shows an embodiment of the temperature control part, where 34 is a support for the temperature control device, 35 is a torch, and 36 is a cooling device, in which a coolant 38 is passed through a rectangular tube 37. If it is difficult to control the temperature by heating alone, use a cooling device to control the temperature. As described above, the present invention makes it possible to form cylindrical or irregularly shaped products of thin plates or soft metal strips using a cold rotating piece, which was conventionally done by pressing or deep drawing. It is possible to efficiently produce products with accurate shapes with high precision, and has great industrial effects such as reducing product costs.

[Brief explanation of the drawing]

Figures 1 and 2 are perspective views of the molded product, Figure 3 is an end view of the irregularly shaped product, Figure 4 is a perspective view of the product, Figures 5A, b and c are side views of the product, and Figure D , e and f are the end views thereof,
Figures 6G, h and i are side views of the product according to the invention, Figures J, k and 1 are end views thereof, Figure 7 is a front view of the device of the invention, and Figure 8 is another example of the device of the invention. FIGS. 9M and 9N are explanatory diagrams of the embodiment, FIG. 9 is an explanatory diagram of forming by heating deformation, FIG. 10 is an explanatory diagram of another embodiment using the apparatus of the present invention, and FIG. 11 is an explanatory diagram of the temperature adjustment device.

Claims (1)

[Claims] 1. Pipes and irregularly shaped members are formed by continuously cold bending a metal strip between vertically opposing rotating cylinders or irregularly shaped pieces whose cross section perpendicular to the axis is a circle. In the cold piece forming method for manufacturing, before and during the forming process, the approximate center of the metal strip is heated to increase the temperature to give plastic deformation in the longitudinal direction, thereby reducing distortion at the edges of the metal strip. A rotary profile piece forming method for thin plates and soft metal strips that enables the production of pipes and profiled materials by equalizing them. 2. In a cold piece forming device that manufactures cylindrical and irregularly shaped products from thin sheets and soft metal strips, one or more heating units are installed between rotating piece stands to heat approximately the center of the metal strip. 1. A rotary irregular-shaped piece forming device, characterized in that it is provided with a device.