JPH03258423A - Method for plastically forming plural parts - Google Patents

Abstract

PURPOSE:To simplify transportation between stage and positioning by performing successive forming through band-shaped connected sections to obtain plural parts in the plastic forming of composite stages including drawing and trimming stages. CONSTITUTION:In the plastic forming of plural parts including drawing and trimming stages and other plastic working stages of a work W, scrap section 4 is left on the peripheral section in the drawing stage, plural trimmed sections 5 which are connected with each other through the band-shaped connected sections 6 are formed in the trimming stage and as these connected sections 6 are cut away, plastic working is performed to obtain plural parts. In this way, when the sections to form plural parts are kept under a mutually connected state from the drawing stage to the following plastic working stage through the trimming stage, the transportation between each stage and the positioning can be simplified.

Description

Detailed Description of the Invention A1 Objective of the Invention (1) Industrial Application Field The present invention relates to a drawing process of a workpiece, a trimming process following the drawing process, and other plastic working processes following the trimming process. The present invention relates to a method of plastic forming a plurality of parts in which a plurality of parts having the same shape are obtained by sequentially passing through the following steps.

(2) Conventional technology Conventionally, a workpiece made of a single thin steel plate is transported so that it passes through multiple plastic working processes at mutually spaced positions in sequence. A method in which two or three materials are plastic-processed simultaneously using a single mold to obtain a plurality of parts at the same time is already known, for example, from Japanese Patent Application Laid-open No. 74818/1983.

(3) Problems to be Solved by the Invention In the conventional method described above, a plurality of mutually separated materials are simultaneously conveyed to the next plastic working step. That is, the plurality of materials obtained in the drawing process are simultaneously conveyed to the next trimming process, and after the plurality of raw materials are trimmed in the trimming process, they are further simultaneously conveyed to the next plastic working process.

However, in the case where a plurality of materials separated from each other are conveyed simultaneously as described above, simultaneous conveyance of the plurality of materials is not easy, and furthermore, positioning in the next plastic working step becomes difficult. In particular, for parts such as the rear outer of a passenger vehicle, where the material is placed in an inclined position to perform plastic processing such as bending, if the material is separated from each other, it may be difficult to position it in the mold. The material tends to shift to one side, and the mold structure may become complicated to prevent this shift.

The present invention has been made in view of the above circumstances, and at least in the drawing process to the trimming process and the plastic working process immediately thereafter, continuous materials are conveyed to facilitate conveyance, and each material is positioned. The object of the present invention is to provide a method for plastic forming multiple parts that is easy to perform.

B1 Structure of the Invention (1) Means for Solving the Problems According to the method of the present invention, in the drawing process, a plurality of drawn parts connected to each other are simultaneously formed while having a shape with scrap parts left at the peripheral edge. In the drawing and trimming process, the scrap portions of each of the trimmed parts are left behind to form a plurality of trimmed parts connected to each other via a plurality of belt-like joints. and bring the plurality of trimmed parts connected via the band-like connection part to another plastic working process following the trimming process, and perform plastic working while cutting the band-like connection part to form multiple parts. I tried to get it.

(2) Effect According to the above method, a plurality of drawn parts are connected between the drawing process and the trimming process, and a plurality of drawn parts are connected between the drawing process and at least another plastic working process immediately after the trimming process. The trimming molding portions are connected via a band-like connecting portion.

(3) Example Hereinafter, an example in which the present invention is applied to rear outer molding of a passenger vehicle will be described with reference to the drawings.

Figures 1 to 4 sequentially show the steps for molding a pair of rear outerwear, where (a) is a plan view and (b) is a plan view.
is a sectional view thereof.

When molding a pair of rear outer
, A workpiece W as shown in (b) is prepared. This work W is formed by blank forming a single thin steel plate, and has a shape necessary to secure the material W+ necessary for the next drawing process.

The workpiece W is drawn by upper and lower molds (not shown) in the drawing process, and as a result, as shown in FIG. 2(a), (
A material W2 as shown in b) is obtained. This material W2 has a pair of drawn parts 1.1 symmetrical about the center line C-C.
are connected via a flat connecting portion 2, and a through hole 3 is formed in the connecting portion 2. The raw material W2 is formed into a shape having a scrap part 4 around the pair of drawn parts 1.1. That is, in the drawing process, the material W+ is drawn so as to simultaneously form a pair of drawn parts 1, 1 that are connected to each other while leaving a scrap part 4 on the periphery.
, will be obtained.

In the next trimming process, as shown in FIGS. 3(a) and 3(b), a pair of trimming forming parts 5, 5 are connected to each other via a plurality of, for example, a pair of band-like connecting parts 6.6. In order to obtain a raw material W having
The scrap portion 4 is removed leaving behind. Each trimming molded portion 5.5 is formed in a shape having a processed portion 7.7 in a bending step which is the next plastic working step.

In the bending process, the material W is
The bending process is performed, and as shown in FIG.
．． A pair of materials W separated from each other while each having 8
4. W is obtained.

In FIG. 5, the mold apparatus for the bending process includes a fixed base 10 and a pair of fixed molds 11.11 fixed on the base 10 on which each trimming molding part 5.5 is placed. , a lifting table 12 that can be raised and lowered above the base 10, and the fixed mold 11.
．． A pair of movable molds 13.13 are fixed to the lifting platform 12 to bend the processed portions 7 of the trimming forming sections 5, 5 respectively in cooperation with the trimming forming sections 5.11, and each trimming forming section 5.5.
A pair of suppressing pads 14.14 are supported on the lifting table 12 so as to be resiliently biased downward to be compressed between the fixed mold 11 and allow relative vertical movement within a limited range.
Equipped with.

Moreover, in this mold apparatus, fixed blades 15 are provided at the upper edges of the double-sided molds 11, 11 corresponding to the band-like connecting parts 6.6, and the lifting platform 12 is provided with fixed blades 15 that cooperate with the fixed blades 15. A movable blade 16 is provided for working to cut off the band-like connection 6.6.

That is, in the bending step using the above-mentioned mold device, 1. By bending a material W having a pair of trimming forming portions 5.5 that are connected to each other via a pair of band-like connecting portions 6.6. , a pair of materials W4, W4, each having a flange portion 8 but separated from each other, are obtained.

According to this series of forming processes from the drawing process to the trimming process to the bending process, plastic working is performed with the parts corresponding to a pair of parts interconnected until the bending process. Therefore, at least during that time, transportation to the next process becomes easy. In addition, in the drawing process, if the pair of drawing parts 1, 1 are tilted downward on opposite sides as shown in Fig. 2, etc., then in the next trimming process and bending process, the mold When placed on the fixed mold in the device, the two drawn parts 1.1 or the two trimmed parts 5.5 are prevented from shifting on the fixed mold 11.11 shown in FIG. 5 as much as possible. It is possible to avoid complicating the mold configuration in order to prevent misalignment, and positioning can be facilitated while maintaining a simple mold configuration.

Moreover, the mold device design from the drawing process to the trimming process to the bending process can basically utilize the mold shape at the time of drawing, making the overall mold design easy.

By the way, in the above-mentioned embodiment, the band-shaped connecting portion 6.6 was removed in the bending process, but if it does not interfere with plastic forming, the band-shaped connecting portion 6.6 can be removed in the piercing process, restriking process, etc. following the bending process. 6 and 6 may be removed.

Also, instead of forming the band-shaped connections R6, 6 on a part of the scrap part 4 as shown in FIG. The flange portion 8 may be formed by bending the processed portion after cutting off the band-like connecting portion 6 in a bending step.

Further, in the above embodiment, a case was described in which a pair of parts were plastically formed, but it goes without saying that the present invention can be applied to plastically forming three or more parts.

C1 Effects of the Invention As described above, according to the method of the present invention, in the drawing process,
A plurality of drawn parts connected to each other are drawn simultaneously while having a shape with a scrap part left on the periphery, and in the trimming process, a plurality of drawn parts connected to each other via a plurality of band-like connecting parts are drawn. In order to form a trimming molded part, the scrap part of each of the proof molding parts is removed while leaving the band-like connecting part, and the plurality of trimming molded parts connected through the band-like connecting part are removed following the trimming process. Since we made it possible to obtain multiple parts by applying plastic working while removing the band-like joints, at least from the drawing process to the trimming process to the subsequent plastic working process, multiple parts can be obtained. The parts for molding the parts are interconnected, so that transportation between each process and positioning in each process are facilitated.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG.
), (b) to 4 (a), et al.) sequentially show the materials obtained in the plastic forming process, and Fig. 1 (a) is a plan view of the workpiece prepared during forming, and Fig. 1 et al.) is shown in Figure 1 (
Figure 2(a) is a plan view of the material obtained by drawing, Figure 2(a) is a cross-sectional view along the line nb-nb of Figure 2(a), Figure (a) is a plan view of the material obtained by trimming, Figure 3 (b) is a sectional view taken along line m b - m b of Figure 3 (a), and Figure 4 (a) is the material obtained by bend forming. The plan view of the material (Fig. 4) is a sectional view taken along the line rVb-IVb of Fig. 4(a), and Fig. 5 is a longitudinal sectional view of the mold device used in the bending process. 1... Drawing forming part, 4... Scrap part, 5...
Trimming molding part, 6... Band-shaped connecting part, W... Workpiece

Claims (1)

[Claims] Plasticity of multiple parts in which multiple parts of the same shape are obtained by sequentially passing through a drawing process of a workpiece (W), a trimming process following the drawing process, and another plastic working process following the trimming process. In the forming method, in the drawing process, a plurality of drawn parts (1) that are connected to each other are drawn simultaneously while leaving a scrap part (4) on the periphery, and in the trimming process, a plurality of strip-shaped parts are drawn. Connecting part (
6), the scrap portion (4) of each drawing portion (5) is removed, leaving the band-like connecting portion (6) to form a plurality of trimmed portions (5) interconnected via The plurality of trimmed parts (5) that are cut out and connected via the band-like connection part (6) are brought to another plastic working process following the trimming process, and the band-like connection part (6) is removed while being plasticized. A method for plastic forming multiple parts, characterized in that multiple parts are obtained by processing.