JPH0576948A - Manufacture of corrugated plate - Google Patents

Abstract

PURPOSE:To manufacture a wide corrugated plate at a low cost by working while gradually shifting the part to be corrugated from the end part in the width direction of a long plate to the center part and suppressing the reduction of width at the time of corrugation, in the case of forming a corrugation on a long plate. CONSTITUTION:In forming corrugation in the width direction of a long plate or a band material, a corrugation work is performed by gradually shifting the long plate or band material from the end part in the width direction to the center part. Thus, the restraint against tension in width direction (width shrinkage stress) generated inside the plate during the corrugation work is effectively enhanced. Between a forming tool 6 and the raw material 7, not only the friction R but also the restraint R', by which the pull-in of the corrugated shape on the side of the stepped part formed in the preceding stage is suppressed, is applied as a restraint against the width shrinkage stress at the time of corrugation work near the center of the width. If the corrugation on the end part is sufficiently formed in the preceding stage by this restraint R', the stress may be increased as much as the deformation resisting value of the plate, and the maximum effect as the restraint is expected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a corrugated shape in the width direction of a long plate or strip.

[0002]

2. Description of the Related Art A method for forming a corrugated shape in the width direction of a long plate or strip is disclosed in, for example, Japanese Patent Laid-Open No. 52-19155.
As disclosed in Japanese Unexamined Patent Publication (Kokai), a pair of forming rolls 1 having multiple grooves 2 in the circumferential direction of the roll 1 as shown in FIG.
a, 1b, a method of simultaneously engaging the entire width of the long plate member 3 or the band member, as disclosed in Japanese Patent Laid-Open No. 63-5828, as shown in FIG. A method of engaging with a group of forming rolls 4 arranged to perform wave processing, and a pair of corrugating forming dies 5a, 5b having a large number of taper grooves in the longitudinal direction as shown in FIG.
There are ways to pull out through the space.

However, when attention is paid to the width of the corrugated plate material, in the molding method of FIG. 7, there is no constraint on the width shrinkage because the corrugation is performed from the central portion in the width direction, and in the molding method shown in FIG. Since the total arc length is almost the same as the width of the plate material before processing, the width of the corrugated plate material is significantly reduced compared to the width of the plate material before processing. Also in the molding method of FIG. 5,
Since the hole-shaped roll and the plate material are in contact with each other almost at the same time in the plate width direction, the restraining force against the width shrinkage is increased as compared with the forming method of FIG. 7, but at the same time, as shown in FIG. Since the width shrinkage force also increases, the width of the corrugated plate material decreases with respect to the plate material width before processing. Therefore, in order to obtain a wide corrugated plate material in these conventional techniques, it is necessary to use a considerably wide plate material as a raw material, which causes a problem of high cost.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above problems in the prior art and provides a method for inexpensively manufacturing a wide corrugated plate material by suppressing a reduction in width during corrugation processing. The purpose is to

[0005]

In order to achieve the above-mentioned object, the gist of the present invention is to form a corrugated shape in the width direction of a long plate or strip with a long plate or strip having a long wave forming portion. It is a method of manufacturing a corrugated plate material, which is characterized in that the material is gradually shifted from the widthwise end portion to the central portion and processed.

The present invention will be described in detail below. When performing corrugation processing in the width direction of a plate material, the corrugated plate material with the same width as the material (flat material before corrugation) has a longer arc length in the cross section than the material width, so the wave forming is performed. Tension in the width direction is generated inside the inner plate material, which is the main reason for reducing the width of the corrugated plate material after forming.

By the way, in the actual processing state, the width shrinkage due to the tension in the width direction is suppressed by the frictional force between the forming tool and the plate material, the restraint of the plate material other than the corrugated portion in the cross section by the plate material, the restraint by the front and rear plate materials and the like. Therefore, it is considered that the arc length of the corrugated plate material after forming is longer than the material width. That is, if the restraining force against these width shrinkages (hereinafter simply referred to as restraining force) can be increased, it is possible to suppress the width reduction at the time of corrugation processing and manufacture a wider corrugated sheet material from the same sheet width material. It will be possible.

To increase the frictional force between the forming tool and the plate material among the above-mentioned restraining forces, a method such as increasing the surface roughness of the forming tool can be considered, but there is a limit even if the frictional force increases, and the corrugated plate material It also affects (roughens) the surface properties. Also,
Even for restraint by the front and rear plate materials, it is difficult to change the material cross-sectional shape before and after the processing area (entrance side: flat plate, exit side: corrugated plate) in a wide range, and it is necessary to add the shape positively. Processing equipment is required.

Therefore, the inventors have paid attention to the restraint by the plate material in the portion other than the wave forming portion in the remaining cross section, and gradually shift the wave forming process from the end portion in the width direction to the center portion when forming the wave shape in the width direction. It was found that the binding force against width shrinkage can be effectively increased by applying it. That is, as shown in FIGS. 1B and 1C, not only the frictional force R between the forming tool 6 and the material 7 but also the restraining force R that suppresses the pull-in of the corrugated shape on the step side formed in the previous stage. ′ Acts as a restraining force against width shrinkage when performing wave processing from the width center. The frictional force R is proportional to the forming force P and is small at the initial stage of forming, whereas this restraining force R'is about the deformation resistance value of the plate material if the corrugation on the end side is sufficiently formed in the previous stage. It is possible to increase to the maximum, and the maximum effect as a binding force can be expected.

When the corrugated shape is formed in the width direction, the wave forming process is performed by gradually shifting from the end portion in the width direction to the central portion, and a multistage using die 6 or roll having a hole shape as shown in FIG. FIG. 3 shows the casting method, the multi-stage rolling method, the casting method using the die 6 having the continuously changing hole shape as shown in FIG. 2, and the case where the wave heights of the products may be different in the width direction. Rolling using a roll 8 having a hole shape in which the wave height increases toward the end in the width direction as shown can be considered. When the number of waves in the width direction is large, the entire width may be divided into three or more blocks, and wave shaping may be performed by gradually shifting from the end block in the width direction to the center in block units.

[0011]

EXAMPLE A sine wave having a wave height of 15 mm and a wave pitch of 33 mm (wave number 30) was formed on a strip material having a plate thickness of 2 mm and a plate width of 1000 mm by rolling using a hole roll. As a result, the width of the corrugated plate after processing was reduced to 820 mm and the width was reduced by about 20% when the entire width was corrugated at the same time. The width of the corrugated plate is 950 mm when the corrugated plate is divided into 5 blocks in the width direction, and the corrugated plate is processed by rolling in three passes with the part to be machined gradually shifted from the end block in the width direction to the center part. 5%
It turned out to be drastically reduced to.

[0012]

According to the present invention, it is possible to manufacture a wide corrugated plate material at low cost by suppressing the width reduction during corrugation processing.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing the configuration and principle of the present invention.

FIG. 2 is a diagram showing an example of a die shape used in a casting method which is one of the embodiments of the present invention.

FIG. 3 is a diagram showing an example of a hole shape of a roll used in the rolling method which is one of the embodiments of the present invention.

FIG. 4 is a schematic diagram showing a roll pass schedule of a roll used in an example of the present invention.

FIG. 5 is a schematic diagram showing a configuration of a conventional method.

FIG. 6 is a schematic diagram showing the principle of width shrinkage in the conventional method shown in FIG.

FIG. 7 is a schematic diagram showing a configuration of a conventional method.

FIG. 8 is a schematic diagram showing another configuration of the conventional method.

[Explanation of symbols]

 1 roll 2 groove 3 plate material (strip material) 4 forming roll 5 corrugated forming die 6 forming tool 7 material 8 roll

Claims (1)

[Claims] 1. When forming a corrugated shape in the width direction of a long plate or strip, the corrugated portion is gradually shifted from the end in the width direction to the center of the long plate or strip. Method for manufacturing corrugated plate material.