JPH02235539A - Rolling method for step difference plate - Google Patents

Abstract

PURPOSE:To prevent the snake motion at the time of rolling continuously a step difference plate by using a planetary rolling roll and a curved surface fixed base, and to obtain the step difference plate having high dimension accuracy by rotating the fixed base in the horizontal direction centering around its tip in accordance with the snake motion quantity of the step difference plate. CONSTITUTION:A metallic plate 1 supplied from an uncoiling reel 13 is fed into a clearance between a work roll 11b of a planetary rolling roll 11 and a curved surface fixed base 12 by a feed roll 14, and becomes a step difference plate 3 by rolling. Subsequently, after drawing out the step difference plate 3 by a pull roll 15, it is coiled to a coiling reel 16. At the time of an actual operation, a shift is generated due to a camber and uneven plate thickness of a stock metallic plate 1, therefore, by rotating the curved surface fixed base 12 by a necessary angle in accordance with its quantity, the shift of the step difference plate 3 can be controlled freely. Accordingly, even if the camber and the uneven plate thickness exist in the stock metallic plate 1, the step difference plate 3 having high dimension accuracy can be manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for rolling a stepped plate having steps in the width direction, and more particularly to a rolling method for preventing the meandering of the stepped plate. (Prior art) Electronic components such as lead frames, connectors, and relays for power transistors, or cladding materials are made of metal step plates having steps in the width direction as shown in Fig. 1 (a) and (b). 3 is used. Methods for manufacturing the stepped plate include cutting with a milling machine and forming by partial rolling. However, the manufacturing method using a milling machine is inefficient and reduces the yield, and the partial rolling method has little expansion in the width direction, resulting in large elongation only in the longitudinal direction, resulting in poor shape. Therefore, as shown in FIG. 2(a) (bl), a flat die 2 with an acute-angled tip is pressed against the front surface of the metal plate I, and a roll 4 is brought into contact with the back surface of the die 2 to reciprocate as shown in the figure. A method has been proposed in which the metal plate 1 is moved forward intermittently in the direction of the outlined arrow to produce concave or convex stepped plates.According to this manufacturing method, most of the deformation is caused by expansion in the width direction. However, this method requires only one roll to press the metal plate, and there is a limit to the feed rate because the roll moves back and forth in the longitudinal direction of the metal plate. In order to solve this problem, a metal stepped plate rolling method using planetary rolling rolls and a curved fixed platen was proposed (Japanese Patent Laid-Open No. 60-6234). .This stepped plate rolling method uses a planetary rolling roll 11 consisting of a backup roll lla as shown in Fig. 3 and a number of work rolls llb arranged around it, and a planetary rolling roll 11 as shown in Figs. An apparatus equipped with a curved surface fixing plate 12 having protrusions formed on the curved surface as shown in FIG. Then, the metal plate 1 is inserted into the gap formed between the curved fixed platen 12 and the work roll llb and rolled continuously.In this method, a large number of work rolls are rotated at high speed in one direction for rolling. It has the advantage of significantly improving productivity.By the way, in stepped plates used for electronic material parts,
Generally, high dimensional accuracy is required; for example, the center deviation is usually 0.21 or less for normal products, and in even more severe cases, the center deviation is 0.21 or less. It must be suppressed to less than one lm. The above-mentioned center deviation occurs due to the meandering of the stepped plate during rolling. In order to prevent this meandering, a device called a displacement guide or a steering guide, for example, is placed on the entrance side of the rolling mill to control the position of the snaking. However, these controls alone cannot completely stop meandering. For example, if the raw metal plate has camber or uneven thickness, meandering will occur and it will not be possible to obtain a highly accurate product. Therefore, for products that require extremely strict dimensional accuracy, a wide metal plate is rolled using a wide metal plate that allows for center deviation in advance, and then slit after rolling to produce a stepped plate with the specified accuracy. This poses a problem in that not only the yield decreases, but also a great deal of time and labor is wasted. (Problems to be Solved by the Invention) An object of the present invention is to prevent meandering when continuously rolling a stepped plate using a planetary rolling roll and a curved fixed platen, thereby producing a stepped plate with good dimensional accuracy. The purpose is to provide a rolling method that enables production.

(Means for Solving the Problem) As a result of various studies on preventing the meandering of the step plate that occurs when rolling the metal step plate, the inventor of the present invention has determined that the curved fixed platen can be moved horizontally according to the amount of meandering of the step plate. They found that meandering could be reliably prevented by rotating it by the necessary angle, and this invention was completed. That is, the gist of the present invention is ``a method for rolling a stepped plate having steps in the width direction while running the metal plate using a planetary rolling roll and a curved fixed platen, wherein the fixing plate is adjusted according to the meandering amount of the stepped plate. Method J for rolling a stepped plate includes rotating the plate horizontally around its tip to control the meandering of the stepped plate. (Function) The method for rolling a stepped plate of the present invention will be explained below with reference to the drawings. First, the rolling process of the present invention will be explained using FIG. 3 shown earlier.As shown in FIG. It is fed into the gap between the roll llb and the curved fixed platen l2, and is rolled to become the stepped plate 3.The stepped plate 3 is then pulled out by the pull-out roll l5 and then wound onto the take-up reel 16. When rolled by the planetary rolling roll 11 and the curved fixed platen 12, is subjected to a force F shown by a white arrow in FIG. , is the following combined force generated from the force P received from the protrusion 12a of the curved fixed platen 12 and its frictional force μP, and the force Psinα received from the work roll llb and its frictional force μPsinα. Note that α is the horizontal surface of the protrusion 12a of the fixed platen. It is the angle with respect to .F = P (cosα−μ(s
in α + cos α) 1 In a state where ideal rolling is performed without meandering of the stepped plate 3, that is, in a state shown in FIG. 6, the exact same force F in the left and right width direction of the metal plate 1 is applied.
There is one rib. Now, when the metal plate 1 is fed by Δl as shown in FIG. 7 from the ideal rolling state shown in FIG. Considering the case where the metal temporary 1 is the protrusion 12 of the curved fixed plate
The resultant force F received from a and work roll llb is asymmetrical as shown by the solid arrow due to the difference in contact area in the left and right width directions. As a result, the metal plate 1 receives the moment M shown by the white arrow, and as shown in FIG. 8, a center deviation δ occurs at the step ui3. Conversely, when the curved fixed plate 12 is rotated clockwise, the step plate shifts to the side opposite to that shown in FIG. 8 (to the left as viewed in the drawing). Therefore, as shown in FIG. 9, by rotating the stationary plate 12 in the left and right horizontal directions around its tip T, the displacement of the step plate can be freely controlled. Furthermore, the center of rotation does not have to be strictly limited to the tip T; the same effect can be achieved even if it is shifted further inward. In the above explanation, in order to make it easier to understand the principle of the method of the present invention, the curved fixed plate was rotated to cause a shift in the stepped plate, but in actual operation, the shift would occur due to the camber or unevenness of the temporary thickness of the metal plate. The misalignment can be easily eliminated by rotating the curved fixed plate by the required angle according to the amount. Next, an example of a means for rotating the curved fixed plate will be explained using Figs. 10(a) and (b). FIG. 10(a) is a side view of the curved fixed platen 12 installed in the stepped plate rolling machine, and FIG. 10@) is a view taken along the line B-B in FIG. 1(a). As shown in Fig. 10), the curved fixed platen 12 is supported by three hydraulic cylinders 18 installed through the housing 17 of the rolling machine and a screw 20 connected to a motor 19, and is supported by a screw 20 connected to the housing l7. It is rotatably fitted into a support pin 21 fixed to. When rotating the curved fixed platen 12 in the horizontal direction, the motor 19
When the screw 20 is moved back and forth by driving the fixed plate 12, the fixed plate 12 rotates using the support pin 21 as a fulcrum. At this time, the curved fixed platen 12 is more firmly supported by the hydraulic cylinder, so there is no wobbling or vibration. In addition, in the figure, 22 is a backup block, 23
is a bank up block lifting device. Also, in this example, a screw was used to rotate the stationary plate, but the invention is not limited to this, and a mechanism using gears such as a rotary positioning table may also be used. Also, the rotation angle θ of the fixed plate
(See Figure 9) -5 degrees to +5 degrees is sufficient;
In actual operation, it is used in the range of -2 degrees to +2 degrees. (Example) Hereinafter, the method of rolling a stepped plate of the present invention will be explained with reference to an example. A step pre-rolling machine (device shown in Fig. 3) having the specifications shown in Table 1 and equipped with a curved fixed platen shown in Fig. 4 is used to achieve a rolling height of 30.
A copper alloy coil with a thickness of 3 mm, a thickness of 1.83 mm, and a length of 200 m was rolled to produce a temporary concave step shown in Fig. 11. Then, we investigated the center deviation. The test results are shown in Table 2. As is clear from the table, in the case of the conventional method that only performs meandering prevention control using the existing steering guide,
The center deviation of the stepped plate was 0.14s+m. In the case of the method of the present invention, the center deviation is 0.10+u+, which is better than when conventional steering guide control is performed. When the conventional meandering prevention system 11l and the method of the present invention are used together, the center deviation of the stepped plate is 0.03.
1, which is an improvement of less than one-fourth compared to the conventional method. (Hereinafter, blank spaces) Table 1 Table 2 (Effects of the invention) As explained above, according to the step plate rolling method of the present invention,
By simply rotating the curved fixed plate slightly, it is possible to control center deviation with accuracy equal to or greater than meandering control using a conventional steering device. Furthermore, by combining the method of the present invention with conventional meandering control, it is possible to manufacture a stepped plate with good dimensional edge even if the raw metal plate has camber or uneven thickness.

[Brief explanation of the drawing]

Figures 1 (a) and (b) are diagrams showing the cross sections of concave and convex stepped plates, Figures 2 (a) and (b) are diagrams showing the manufacturing process of the stepped plate using a flat die, and Figure 3. Fig. 4 is a diagram showing a step plate manufacturing process using a rolling machine equipped with a planetary rolling roll and a curved fixed platen, Fig. 4 is a diagram showing an example of a curved fixed platen, and Fig. 5 explains the principle of the method of the present invention. Figure 6 shows a state in which the stepped plate is being rolled without centering, and Figure 7 shows the uneven force generated by the rotation of the curved fixed plate and the rotational moment applied to the stepped plate. Figure 8 is a diagram showing that the center shift occurs in the step plate when the curved fixed plate rotates, and Figure 9 shows that the center shift occurs when the curved fixed plate is rotated horizontally. 10(a) and 10(b) are views showing an example of a means for rotating the curved fixed plate, and FIG. 11 is a concave step plate manufactured in an embodiment of the present invention. This is the cross-sectional view of . 1 is a metal plate, 2 is a flat die, 3 is a stepped plate, 4 is a roll, l1 is a planetary rolling roll, lla is a backup roll, llb is a work roll, 12 is a curved fixed plate, 12a is a protrusion, 13 is an unwinding reel , 14 is the feed roll,
15 is a pull-out roll, 16 is a rewind reel, 17 is a housing, 18 is a hydraulic cylinder 19 is a motor, 20
is a screw screw, 21 is a support pin, 22 is a backup block, and 23 is a backup block lifting device. Figure/Figure

Claims (1)

[Claims] A method of rolling a stepped plate having steps in the width direction while running the metal plate using a planetary rolling roll and a curved fixed plate, the fixed plate being rolled horizontally with the tip of the plate in accordance with the meandering amount of the stepped plate. A method for rolling a stepped plate, comprising controlling the meandering of the stepped plate by rotating the stepped plate in a direction.