Molded article manufacturing method
A manufacturing method and technology of molded products, which are applied in the field of molded product manufacturing, can solve problems such as difficult-to-bend pipes, different-diameter pipes, and special-shaped cross-section pipes, and achieve high yields and the effects of suppressing poor molding
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no. 2 Embodiment approach
[0094] The second embodiment is a preferred embodiment of the method for producing a molded article of the present invention. The second embodiment includes: a first bending step of press-forming a metal plate to obtain a bent intermediate product bent with a curvature α in the longitudinal direction; a U step of press-forming the bent intermediate product into a substantially U-shaped cross section to obtain a A first curved U-section intermediate product having a bottom portion of the above-mentioned curvature α; a second bending step of bending in the same direction as the direction in which the bottom portion of the first curved U-section intermediate product is bent in the longitudinal direction by press forming , obtaining the second curved U-section intermediate product with a bottom with a curvature β curved in the length direction; A tubular molded product with a bottom of curvature β.
[0095] That is, the second embodiment is characterized in that a second bending ...
Embodiment 1
[0159] make Figure 16 A curved circular tube 1d having a curvature α as shown in (a). Respectively, the curvature α of the longitudinal direction of the inner peripheral side surface of the curved portion 10a of the curved pipe 1d is 0.000465 (1 / mm) (the radius of curvature is 215mm), the bending angle of the curved portion 10a is 40°, and the curved pipe The outer diameter is 65mm, and the length of the straight portion 10b is 150mm. The bending angle of the bending portion refers to a line obtained by extending the axis of one straight portion of the tubular molded product ( Figure 16 The dotted line in (a)) and the line obtained by extending the axis of the other linear part ( Figure 16 Among the angles formed by the dotted line in (a), the angle is the smaller one.
[0160] As the metal plate, the following hot-rolled steel plate is used: having Figure 8 In the shape shown, the width of the bending center is larger than the width of both ends, TS: 390 MPa, plate th...
Embodiment 2
[0167] The same bent circular tube as in Example 1 was produced.
[0168] As the metal plate, the following hot-rolled steel plate is used: having Figure 8 In the shape shown, the width of the bending center is larger than the width of both ends, TS: 390 MPa, plate thickness 2.6 mm.
[0169] use Figure 4 The molds shown in (a) and (b) are carried out in sequence Figure 4~7 The first bending process, the U process, the second bending process, and the O process are shown.
[0170] Molding can be performed without causing cracks and wrinkles in the bent portion. In addition, in the O process, the abutting portion is in a good state and can be joined by laser arc hybrid welding.
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Abstract
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