JPH02229684A - Manufacture of stainless steel-aluminum clad material - Google Patents

Abstract

PURPOSE:To contrive rolling and pressure welding with high plate thickness accuracy by detecting the plate thickness of a clad material subjected to integral rolling and pressure welding at the delivery of the upper and the lower work rolls and controlling a peripheral velocity ratio of the upper and the lower work rolls so that a detection value becomes set target plate thickness. CONSTITUTION:An arithmetic unit 14 calculates a different velocity ratio eta=V1/V2 from peripheral velocities V1, V2 of the upper and the lower work rolls 1, 2, based on detection speeds by rotation speed detectors 13A, 13B, and also, calculates the deviation quantity DELTAh to target plate thickness of delivery side plate thickness, based on detected plate thickness by a plate thickness detector 12, and calculates the variance quantity DELTAeta of the different velocity ratio from these values. A controller 15 controls driving motors 3A, 3B by a signal of the variance quantity of the different velocity ratio calculated by the arithmetic unit 14. In such a way, rolling and pressure welding can be executed with high plate thickness accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for producing a stainless steel-aluminum clad material by rolling and pressure welding stainless steel and aluminum. BACKGROUND ART Stainless steel strips used for automotive trim members and similar members are used in a relatively soft annealed state. That is, since the stainless steel strip as described above is in a soft annealed state, it can be easily formed into an appropriate trim form and used. By the way, when stainless steel is used alone for trim members, etc., electrochemical corrosion may occur between the stainless steel and the steel plate of the car body, depending on the usage environment, resulting in corrosion of the steel plate of the car body. Therefore, a method has been proposed in the past that uses a cladding material in which a stainless steel strip is lined with an aluminum strip as a trim member, etc., to preferentially corrode the aluminum and prevent corrosion of the steel plates of the vehicle body. As described in Japanese Patent Application Laid-Open No. 50-3071, the conventional manufacturing method for stainless steel-aluminum clad material is to make the circumferential speeds of the upper and lower rolls different, and to place stainless steel on the high-speed roll side that rotates at a high circumferential speed. A method has been proposed in which a steel strip is placed and an aluminum strip is placed on the side of a low-speed roll that rotates at a low circumferential speed. Problems to be Solved by the Invention However, the method for manufacturing a cladding material disclosed in JP-A-50-3071 suffers from the growth of thermal crowns on work rolls, occurrence of roll wear, and roll roughness as rolling progresses. This has the disadvantage that the friction coefficient between the rolls and the material and the distance between the rolls change due to the reduction, and the thickness of the clad material that has been rolled and welded differs greatly from the target thickness. One possible way to reduce this plate thickness deviation is to reduce the gap between the high-speed roll and the low-speed roll, but relatively large rolls are used for rolling the clad material, and large rolls are used for pressure welding. Since pressure is required, the roll flattening becomes large, and since the rolling pressure increases due to the roll flattening, there is a risk of exceeding the load limit of the rolling mill. The purpose of the present invention is to solve these problems and provide a method for manufacturing a stainless steel-aluminum clad material with high plate thickness accuracy. <Means for Solving the Problems> The present invention, when manufacturing a cladding material by rolling and welding a stainless steel strip and an aluminum strip using upper and lower work rolls, makes the circumferential speeds of the upper and lower work rolls unequal to achieve a high circumferential speed. In a method for manufacturing a stainless steel-aluminum clad material in which a stainless steel strip is arranged on a side work roll and an aluminum strip is arranged on a low circumferential speed side work roll, the cladding is rolled and welded together on the exit side of the upper and lower work rolls. The thickness of the material is detected and the circumferential speed ratio of the upper and lower work rolls is controlled so that the detected value becomes a preset target thickness. Effect〉 If the high speed roll circumferential speed is vI and the low speed roll circumferential speed is ν2, and the different speed ratio is defined as η= v +' / v x,
The rolling load P of stainless steel strip aluminum, IIF is as follows, where a1b is a constant determined by the material, rolling reduction, etc.
P-a-exp (b (1 77) l
−−−−−It is determined by (1). In addition, the plate thickness h of the clad material is determined by Ph − − +s.M, where M is the mill constant and S0 is the roll gap when no load is applied. −・・・
・−・・− (2) Calculated by M. Here, the plate thickness of the cladding material is Δh with respect to the target plate thickness h1.
The amount of change Δη of the different speed ratio when a deviation occurs is (1),
Transforming equation (3) obtained from equation (2), .・・・・・・−
-11 (4). Therefore, according to the present invention, by adjusting the different speed ratio of the drive roll according to the equation (3) based on the detection of the deviation amount Δh from the target value of the exit side Fi thickness, the above deviation is eliminated and the cladding material reaches the target value. It becomes possible to perform rolling pressure welding to the plate thickness.

Embodiment> FIG. 1 is a side view schematically showing an example of rolling equipment to which the present invention is applied. In FIG. 1, 1 is an upper work roll and 2 is a lower work roll. In this example, the peripheral speed of the upper work roll 1 is higher than that of the lower work roll 2. 3A
3B is the drive motor for the upper work roll, and 3B is the drive motor for the lower work roll. 4 is a stainless steel/copper strip that is rewound from the unwinding reel 5 and rolled and welded on the upper work roll 1 side at a high circumferential speed. 6 is aluminum 4iF which is rewound from the unwinding reel 7 and rolled and welded on the lower work roll 2 side at a low circumferential speed. 8A is a drive motor for the rewind reel 5, and 8B is a drive motor for the rewind reel 7. Reference numeral 9 denotes a stainless steel-aluminum clad material that is rolled and welded by upper and lower work rolls 1 and 2, and is wound onto a take-up reel 10. 11 is a drive moke for the take-up reel lO.

12 is a vi.1 installed on the exit side of the upper and lower work rolls. J! X
Detector 13A is a rotation speed detector 1 for the drive motor 3A.
3B is the rotation speed detector of the drive motor 3B. 14 is the different speed ratio η-V+/V! from the circumferential speeds V,,v2 of the upper and lower work rolls calculated based on the detected speeds of the rotational speed detectors 13A and 13B. Also, based on the plate thickness detected by the plate thickness detector l2, calculate the deviation amount Δh of the outlet side plate thickness from the target plate thickness, and from these values, change the different speed ratio from the above equation (4). This is a calculation device that calculates the quantity Δη. l
Reference numeral 5 denotes a control device 1n that controls the drive motors 3A and 3B based on a signal representing the amount of change in the different speed ratio calculated by the calculation device 14. The example shown in FIG. 1 is a facility configured to roll and weld the stainless steel strip 4 to the upper work roll 1 without wrapping it around the lower work roll 2 while wrapping the aluminum strip 6 around the lower work roll 2. The equipment to which this is applied is not limited to this, for example, it can also be applied to equipment configured to wrap the stainless steel strip 4 around the upper work roll 1. Next, a concrete example of the present invention will be explained.
A stainless steel strip 4 of 31llI11 temporary width 7 (lm) and an aluminum strip 6 of plate thickness III11 temporary width 70 lm,
Both the method of the present invention and the conventional method have a total reduction rate of 40% and a different speed ratio of the peripheral speed of the low peripheral speed roll to the peripheral speed of the high peripheral speed roll of 0.
It was rolled at 5. On the other hand, the conventional method involves rolling and welding without controlling the plate thickness. FIG. 2 is a graph showing a comparison between the results of the present invention described above and the results of the conventional method. Figure 2 is a graph showing the relationship between rolling distance and thickness deviation of cladding material.
The figure shows that in the conventional method, the plate thickness deviation increases as the rolling distance increases, but in contrast, in the method of the present invention, the plate thickness deviation does not increase even if the rolling distance increases.
<Effects of the Invention> As explained above, according to the method of the present invention, stainless steel and aluminum clad materials can be rolled and welded with high plate thickness accuracy, and extremely excellent effects are achieved.

[Brief explanation of the drawing]

Fig. 1 is a side view schematically showing an example of equipment to which the method of the present invention is applied, and Fig. 2 is a graph showing a comparison of the concrete implementation results of the present invention with the results obtained by the conventional method. be. 1... Upper work roll, 2... Lower work roll, 3A, 3B... Drive motor, 4... Stainless steel strip, 5, 7... Rewinding reel, 6... Aluminum band, 8A, 8B... Drive motor, 9... Clad material, 10... Take-up reel,
11... Drive motor, l2... Fi thickness detector, 13A, 13B... Rotation speed change detector, 14...
Arithmetic device, 15...control device. Figure 2

Claims (1)

[Claims] When manufacturing a cladding material by rolling and welding a stainless steel strip and an aluminum strip using upper and lower work rolls, the circumferential speeds of the upper and lower work rolls are made to be different, the stainless steel strip is placed on the high circumferential speed work roll, and the low circumferential speed is In a method for manufacturing a stainless steel-aluminum clad material in which an aluminum strip is arranged on a speed side work roll, the plate thickness of the clad material that is rolled and welded together on the exit side of the upper and lower work rolls is detected, and this detected value is set in advance. A method for manufacturing a stainless steel-aluminum clad material, characterized in that the peripheral speed ratio of the upper and lower work rolls is controlled so as to achieve a target plate thickness.