JPH023675B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a method of manufacturing a clad plate by rolling. The present invention can be applied not only to metal clad plates but also to non-metal clad plates. (Prior art) When manufacturing a clad plate that is difficult to bond by rolling, the metal on the side with smaller deformation resistance is swept away toward the rear end in the rolling direction at the initial stage of rolling, causing the clad ratio to decrease. (Laminated material thickness/
The base material thickness) not only deviated from the target value, but also changed in the rolling direction, and the amount of edge truncation was large. When manufacturing a clad plate that is difficult to bond by rolling, it is necessary to increase the rolling reduction ratio, but in this case, the above-mentioned problems tend to increase. (Object of the invention) The present invention reduces the unbonded area ratio (unbonded area/inspection area x 100 (%)) when manufacturing clad plates that are difficult to bond by rolling, and reduces the variation in cladding ratio. The purpose of the present invention is to provide a method for reducing the amount of end truncation. (Structure and operation of the invention) The present invention is structured as follows. (1) A method of rolling a clad plate, which is characterized in that when the assembled clad plate is reduced in thickness and crimped with rolling rolls without using an adhesive medium, rolling is started from the center toward the ends. (2) When reducing the thickness of the clad assembly plate and crimping it using rolling rolls without using an adhesive medium, the method is characterized in that the plate is rolled from the center to the edges and then rolled in the opposite direction from the center. Rolling method for clad plate. (3) When carrying out tentering rolling in which the clad assembled plate is thinned and crimped by rolling rolls without using an adhesive medium, rolling is performed while increasing the distance between the roll pairs from the center to the ends. Rolling method for clad plate. Differences in deformation resistance due to the different materials of the cladding material and base material that make up the clad plate cannot be avoided.
The smaller the surrounding restraint, the larger the reduction ratio on the side with lower deformation resistance, and the more excess metal is swept away backwards. At this time, if both plates are not restrained at the rear end, the material with lower deformation resistance will stretch more, but if the rear end is restrained, the thickness of this material will increase toward the rear end. It turns out. In the present invention, in the early stage of rolling, the gas between the mating plates and the base material is pushed out to the outside through the shortest distance to promote adhesion, and the initial light rolling increases the restraint between the two plates, preferably localized. to prepare for large reduction rolling for the next crimping. To explain the present invention in detail, FIGS.
The figure shows an example of a clad assembly plate that can be used in the present invention, and in FIG. 1, the base material 1 and the mating material 2 are
They are assembled together by welding, and micro holes 4 are provided around the four circumferences of the base material to communicate with the outside air and the gap between the base material and the bonded material. Figure 2 shows the case where the base material 1 is added with waste material 5 and joint material 6 to surround the cladding material, and Figure 3 shows the case where the base material 1 and the joint material 6 surround the two laminate materials. It is suitable for manufacturing two sets of cladding materials at the same time. The micropores 4 may be constructed such that they open only after rolling, or may be filled with such a material to prevent the atmosphere in the furnace from entering during heating. In the present invention, as shown in FIG. 4, the central part of the clad assembly plate 8 is compressed by a roll 9, and the roll 9 is
It rotates in the direction of 0 and starts rolling toward the end, but in order to avoid damaging the welded part at the end and to reduce the amount of end truncation, it gradually rolls toward the end. Rolling is performed while increasing the distance between rolls. Further, in order to maintain the symmetrical shape of the clad assembly plate 8, rolling is performed in the opposite direction, preferably from the center toward the ends. It is desirable that the first two passes described above are tenter rolling in a direction perpendicular to the subsequent rolling direction. In this case, after completing 2 passes, remove the clad assembly board.
The plate is rotated 90 degrees and rolled again in two passes from the center to the ends, but at this time it is not necessary to change the plate thickness in the longitudinal direction. For rolling from the center to the ends of the above clad assembly plates, it is necessary to push the gas between the laminated plates and the base material to the outside in the shortest distance, and to prevent damage to the ends.
In addition to adjusting the shape of the finished rolled plate and reducing the amount of cutoff, the aim is to locally bond the base material and the laminated plate to restrain the unilateral flow of both. Complete adhesion is not expected. Therefore, the reduction rate that should be taken at this stage is the maximum
If it is less than 20%, there may be a portion left at the end that is not rolled down in the first two passes of tentering rolling. In the third and fourth passes of rolling from the center to the ends in the longitudinal direction, the central part of the plate width is already locally bonded, so a rolling reduction of more than 20% is taken at the ends of the plate width. The side edges of the clad assembly plate will not be damaged in the rolling width direction if the welding and structure are sound. In order to completely bond the adhesive surfaces, in the case of titanium and steel, it is necessary to apply a reduction rate of 25% or more twice or more, but this value changes depending on the combination of materials. In carrying out the present invention, instead of changing the distance between the roll pairs, a plate having a higher deformation resistance than the clad assembly plate is rolled at the same time, thereby obtaining the same effect as changing the rolling reduction ratio by changing the distance between the roll pairs. be able to. (Example) Table 1 shows examples. Example 1 is the conventional method and 4
This is a case where the passes are rolled back and forth. Examples 2 and 3 are the methods of the present invention, in which the central part of the clad assembly plate is compressed by the roll 9, but the distance between the rolls is not narrowed, and a cold steel billet wedge is charged and rolled. are respectively 5.0×50 (mm) flat plate and 5.0~0.5×50
(mm) taper plate. FIG. 5 shows an explanatory diagram of the first pass of Example 3. By inserting the wedge 13, the same rolling effect as in FIG. 4 is provided.
The front end shape defect length and the rear end shape defect length are end lengths narrower than the center plate width, and the method of the present invention is improved over the conventional method. In particular, the length of the defective shape at the rear end of the conventional method is as long as 34 mm because the rear end of the clad assembly plate was torn during the first pass, and the length was increased by the fact that the cladding material protruded. Unbonded area rate by ultrasonic inspection (unbonded area/inspection area x
100%) has been greatly improved to 2% or less by the present invention. The change in the cladding ratio in the longitudinal direction is 0.16 to 0.24 for the conventional method, excluding the defective shape at the front and rear ends.
While it varies in the range of 0.08, the method of the present invention
It is within the range of 0.18 to 0.23 and 0.05, and the change in cladding ratio is reduced by the method of the present invention.

[Table] (Effects of the invention) As stated above, the present invention does not require an explosion bonding process, and only by rolling can produce a large amount of clad material with high reliability of adhesion, high dimensional accuracy, and high yield. It is a method that can be produced, and the industrial benefits are extremely large.

[Brief explanation of drawings]

1 to 3 are explanatory views showing examples of the clad assembly plate used in the present invention, and FIGS. 4 and 5 are explanatory views showing embodiments of the present invention. FIG. 5 shows the case where a wedge is inserted. 1: Base material, 2: Laminating material, 3: Adhesive surface, 4: Microhole, 5: Waste material, 6: Joint material, 7: Separation surface, 8: Clad assembly plate, 9: Rolling roll, 10: Roll rotation Direction, 11: Traveling direction of the clad assembly plate, 12: Center line of the clad assembly plate before rolling, 13: Wedge.

Claims (1)

[Scope of Claims] 1. Rolling of a clad plate, characterized in that when the clad assembly plate is reduced in thickness and crimped by rolling rolls without using an adhesive medium, rolling is started from the center toward the ends. Law. 2. When reducing the thickness of the clad assembly board and crimping it using rolling rolls without using an adhesive medium, the method is characterized in that the plate is rolled from the center to the ends, and then rolled in the opposite direction from the center. Rolling method for clad plate. 3. When carrying out tentering rolling in which the clad assembly plate is thinned and crimped by rolling rolls without using an adhesive medium, rolling is performed while increasing the distance between the roll pairs from the center to the ends. Rolling method for clad plate.