JPS606284A - Rolling method of clad plate - Google Patents

Abstract

PURPOSE:To make unadhered area smaller, cladding ratio uniform and end discarding less by rolling a clad and assembled plate while decreasing rolling reduction from the central part to each peripheral part for the beginning to prevent elongation slip and subjecting the plate to succeeding rolling. CONSTITUTION:A clad and assembled plate is rolled while the central material is sandwiched with upper and lower plates and the periphery is restrained by welding. The initial rolling is accomplished while the rolling reduction is decreased from the central part toward each peripheral part. Adhesion is improved and elongation slip is prevented in this stage and in succession the plate is subjected to ordinary rolling. Since the adhesion is good, the unadhered area rate is decreased, the clad ratio over the entire part is made uniform, the end discarding by protrusion is decreased and the yield is improved. It is equally satisfactory to provide the same effect as the effect by the decrease in the above-mentioned rolling reduction by pressing a wedge plate having the thickness decreasing from the center toward the periphery to the surface of the clad and assembled plate.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for 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 in the early stage of rolling.
The cladding ratio (laminated material thickness/base material thickness) not only deviated from the target value, but also changed in the rolling direction, and the amount of end truncation was still 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/inspected area x 1oo (%)) and reduces the variation in the clad ratio when manufacturing clad plates that are difficult to bond by rolling. , it is an object of the present invention to provide a method for reducing the amount of end truncation.

(Structure and operation of the invention) The present invention is constructed as follows.

(1) A rolling process for a clad plate, characterized in that rolling of the clad assembly plate is started from the center toward the ends.

(2) A method of rolling a clad plate, which is characterized in that the assembled clad plate is rolled from the center to the ends, and then rolled in the opposite direction from the center.

(3) A method of rolling a clad plate, which comprises rolling the clad assembly plate while widening the roll interval when rolling the clad assembly plate from the center to the ends.

Differences in deformation resistance are unavoidable due to the different materials of the cladding material and base material that make up the clad plate, and the smaller the surrounding restraint, the greater the reduction rate on the side with lower deformation resistance, and the more the excess material is at the rear. The amount that is swept away increases. At this time, if the drawing board is not restrained at the rear end, the material with lower deformation resistance will stretch significantly, but if the rear end is restrained, the thickness of this material will increase toward the rear end. become.

In the present invention, adhesion is promoted by pushing the gas between the laminated plate and the base material to the outside through the shortest distance at the initial stage of rolling.
The initial light reduction increases the restraint between the plates, preferably causing local adhesion, in preparation for the subsequent heavy reduction of the crimping pool.

To explain the present invention in detail, FIGS. 1 to 3 show examples of clad assembly plates that can be used in the present invention. In FIG. Micro holes 4 are provided around the four peripheries to communicate the air gap between the base material and the laminated material to the outside air.

Figure 2 shows the case where the base material 1 is added with waste material 5 and joint material 6 to surround the laminate 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 producing two sets of cladding materials at the same time.

The micropores 4 have a structure that opens only after rolling, or are 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 the roll 9, and the roll 9 is rotated in the direction of the arrow 10 to start rolling toward the end. Rolling is carried out while gradually increasing the distance between rolls toward the ends so as not to damage the welded parts and to reduce the amount of cutoff at the ends.

In order to maintain the symmetrical shape of the clad assembly plate 8, it is rolled in the opposite direction, preferably from the center to the edges.

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, 2.
After finishing the rolling, the clad assembly plate is rotated 90 degrees and the plate is rolled again from the center to the edges for 27 degrees, but at this time there is no need to change the plate thickness in the length direction. .

In rolling the above clad assembly plates from the center to the edges, it is necessary to push out the gas between the mating plates and the base material to the outside in the shortest distance, to prevent damage to the edges, and to adjust the shape of the finished rolled plate. In addition to reducing the amount of cutoff, the aim is to locally bond the base material and the plywood to restrain the unilateral flow of both, and complete bonding is expected at this stage. isn't it. Therefore, the rolling reduction ratio that should be taken at this stage is at most 20 inches or less, and there may remain a portion at the end that is not rolled in the first two passes of tentering rolling. 3rd pass, 4.
In rolling from the center of the longitudinal direction of the cross-grain to the end (5), since the central part of the sheet width is already locally bonded, it is possible to take a rolling reduction of more than 20 inches at the end of the sheet width, and the cladding The side edges of the assembled plate will not be damaged in the rolling width direction if the welding and structure are sound. In the case of titanium and steel, it is necessary to apply a reduction rate of 25% or more twice or more to completely bond the bonding surfaces.
This value changes depending on the combination of materials.

In addition, in carrying out the present invention, instead of changing the roll spacing, the clad assembly plate and the plates with high deformation resistance are simultaneously rolled, thereby achieving the same effect as changing the rolling reduction ratio by changing the roll spacing. can be obtained.

(Example) Table 1 shows examples. Example 1 is a conventional method in which four passes are reciprocated. Example 21 Example 3 is the method of the present invention, in which the central part of the clad assembly plate is compressed by the rolls 9 by charging and rolling a cold steel billet wedge without narrowing the roll interval, and the cross section of the wedge is They are a flat plate of 5.0 x 50 (throat) and a tapered plate of 50 to 0.5 x 50 (6) (tone). FIG. 5 shows an explanatory diagram of the first scale of Example 3. By inserting the wedge 13, the same rolling effect as in FIG. 4 is provided. The front end shape defective length and the rear end shape defective length are narrower end lengths (than the central 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 laminate material coming out. Unbonded area rate by ultrasonic inspection (unbonded area/inspection area x 100%
) has been greatly improved to less than 2 inches by the present invention.

The change in the cladding ratio in the longitudinal direction is 0.16 to 0.24 in the conventional method, and changes in the range of 0.08 when the front and rear end shape defects are excluded, whereas in the method of the present invention, it changes in the range of 0.16 to 0.08. 23 and within the range of 0.05, the change in cladding ratio is small by the method of the present invention.

(Effects of the Invention) As described above, the present invention is a method that does not require an explosion bonding process and can mass-produce cladding materials with high adhesive reliability, high dimensional accuracy, and high yield by only rolling. However, dogs are extremely profitable in terms of industry.

[Brief explanation of drawings]

FIGS. 1 to 3 are explanatory views showing examples of clad assembly plates used in the present invention, and FIGS. 4 and 5 are explanatory views showing embodiments of the present invention. In the case of change, FIG. 5 shows the case of inserting a wedge. 1: Base material, 2: Laminating material, 3: Adhesive surface, 4: Micropore, 5:
Waste material, 6: Joint material, 7: Separation surface, 8: Clad assembly board, 9
: rolling roll, 10: roll rotation direction, 11: clad assembly plate advancing direction, 12: clad assembly plate center line before rolling,
13: Wedge. (9) Teinoa〉 Figure 2 Figure 3

Claims (3)

[Claims] (1) A method of rolling a clad plate, which is characterized in that rolling of the assembled clad plate is started from the center toward the ends. (2) A method of rolling a clad plate, which is characterized in that the assembled clad plate is rolled from the center to the ends, and then rolled in the opposite direction from the center. (3) A clad plate rolling method 0 characterized in that the clad plate assembled plate is rolled while widening the roll interval from the center toward the ends.