JP2022149820A - Manufacturing method of differential thickness metal plate and manufacturing device of differential thickness metal plate - Google Patents

Abstract

To enable a differential thickness metal plate to be produced in large quantities in a simple facility.SOLUTION: A manufacturing device 10 of a differential thickness metal plate comprises: three or more holding units which have pairs of holding members and are arranged at three or more portions in a prescribed direction of the metal plate; and a device for movement which can move the holding units so as to increase distance between the holding units adjacent to each other in the prescribed direction at the two or more portions. The device for movement can move the plurality of holding units which hold the metal plate to stretch a region between the portions held by the holding units at two or more portions, and control separately enlargement amounts of the region between the held portions.SELECTED DRAWING: Figure 4

Description

The present invention relates to a method for manufacturing a metal plate with different thickness and an apparatus for manufacturing a metal plate with different thickness.

For example, in the manufacturing process of automobiles, various panel-like parts are formed by predetermined press working. Also, as a blank material to be supplied to this type of press working, a metal plate having portions with different thickness dimensions (so-called differential thickness metal plate) is known.

For example, the method described in Patent Document 1 is known as a method for manufacturing this metal plate having a different thickness. This method is a method for forming a vehicle body panel, wherein a flat plate is fed to one side to form a first thickness portion and a second thickness portion, and a thickness of the first thickness portion and a thickness of a third thickness portion are formed. A first rolling step of rolling to a plate thickness intermediate to the plate thickness, a second rolling step of rolling the plate to a plate thickness of the second plate thickness portion while sending the flat plate to the other, the first plate thickness portion and the second plate thickness and a third rolling step of setting the interval between the rolling rolls at the boundary of the part to the thickness of the first thickness part, and rolling the flat plate to the thickness of the first thickness part while sending the flat plate to the other under this condition. and a panel molding step of obtaining blanks having different plate thicknesses (thickness dimensions) and molding the obtained blanks to form a vehicle body panel.

JP-A-2000-351030

In the method as described in Patent Document 1, since it is necessary to strictly set the gap between the work rolls that serve as rolling rolls, it is difficult to process in a short period of time, and there is a problem that mass productivity is lowered. In the first place, it is difficult to control the accuracy of the gap between the rolling rolls, and the current situation is that the thickness dimension varies to some extent. In addition, the method described in Patent Document 1 requires not only rolling rolls but also a large number of rolls (feed rolls, guide rolls, etc.) as rolling equipment, so there is a problem that the equipment becomes large. . An increase in the size of equipment impedes the degree of freedom in selecting other peripheral equipment, and indirectly increases equipment costs.

In view of the above circumstances, the technical problem to be solved in this specification is to enable mass production of metal sheets with different thicknesses using simple equipment.

The above problems are solved by a method for manufacturing a metal plate with a different thickness according to the present invention. That is, in this manufacturing method, clamping units having a pair of clamping members and capable of clamping a metal plate as a work are arranged at three or more locations in a predetermined direction along the plane of the metal plate, and the metal plate is clamped by the clamping units. A clamping step of clamping at three or more locations in a predetermined direction, and moving a plurality of clamping units so that the distance between clamping units adjacent to each other in a predetermined direction increases at two or more locations, so that the metal plate is clamped by the clamping units. and a stretching step of stretching the region between the clamped portions at two or more locations, and in the stretching step, by individually controlling the stretching amount of the region between the clamped portions, a predetermined thickness direction distribution is obtained. It is characterized by forming a metal plate having a different thickness.

As described above, in the metal plate manufacturing method according to the present invention, clamping units having a pair of clamping members are arranged at three or more locations in a predetermined direction along the plane of the metal plate, and the three or more clamping units hold the metal plate. I tried to hold the board. Further, the plurality of clamping units are moved so that the distance between the clamping units adjacent to each other in a predetermined direction increases at two or more locations, and the regions between the portions of the metal plate clamped by the clamping units are moved to two locations. In addition to stretching as described above, the amount of stretching at this time is individually controlled. As described above, according to the manufacturing method of the present invention, by simply moving the clamping units clamping the metal plate, two predetermined regions of the metal plate are divided based on the portion clamped by each clamping unit. It can be stretched over a point. Further, the stretching amount at that time is proportional to the moving amount of the clamping unit. Therefore, by independently controlling the movement of each clamping unit, it is possible to independently set the thickness dimension of two or more regions of the metal plate to the desired thickness dimension. Controlling the movement of the clamping unit is easier than controlling the gap between the rolling rolls, and high-speed movement is relatively easy, so overall it is superior in terms of mass production. In addition, since it is basically sufficient to have the clamping units and a device (moving device) for moving these clamping units in a desired manner, the manufacturing apparatus can be constructed easily without worrying about an increase in size. As described above, according to the manufacturing method of the present invention, it is possible to mass-produce a differential thickness metal plate integrally having a plurality of portions with different thickness dimensions using simple equipment.

In addition, in the method for manufacturing a metal plate of different thickness according to the present invention, in the clamping step, by controlling the clamping force of the metal plate by the clamping unit, the thickness dimension of the clamped portion of the metal plate can be individually adjusted. good.

The present invention makes it possible to mass-produce differential thickness metal plates having a predetermined thickness dimension distribution by moving a clamping unit that clamps a metal plate along a predetermined direction to stretch the metal plate. It is necessary to hold the metal plate firmly so that the surface of the metal plate does not slip during stretching. This configuration was made with attention to this point, and by controlling the force at the time of clamping, it is possible to individually adjust not only the area between the clamped parts but also the thickness dimension of the clamped parts themselves. and Combining thinning by clamping and compressing and thinning by stretching in this way makes it possible to deal with a wider variety of thickness distributions. can be further expanded.

Moreover, the solution of the above problems is also achieved by the manufacturing apparatus of the differential thickness metal plate according to the present invention. That is, this manufacturing apparatus is a clamping unit having a pair of clamping members and capable of clamping a metal plate as a work, wherein three or more clamping units are arranged at three or more locations in a predetermined direction of the metal plate; and a moving device capable of moving the plurality of clamping units so that the distance between the clamping units adjacent to each other in a predetermined direction increases at two or more locations, wherein the moving device moves between the portions clamped by the clamping units. It is characterized by being able to move a plurality of clamping units in a state where the metal plate is clamped so as to stretch the region at two or more locations, and to be able to individually control the stretching amount of the region between the clamped parts. be done.

In the metal plate manufacturing apparatus according to the present invention, the clamping units having a pair of clamping members are arranged at three or more locations in a predetermined direction along the plane of the metal plate, and the metal plate can be clamped by the three or more clamping units. did. Further, the plurality of clamping units are moved so that the distance between the clamping units adjacent to each other in a predetermined direction increases at two or more locations, and the regions between the portions of the metal plate clamped by the clamping units are moved to two locations. The film is stretched as described above, and the stretching amount at this time can be individually controlled. As described above, according to the manufacturing apparatus according to the present invention, as in the method for manufacturing a metal plate having a different thickness according to the present invention, only by moving the clamping units holding the metal plate, the metal plate can be clamped by each clamping unit. A predetermined region of the metal plate that is partitioned on the basis of the portion can be stretched at two or more locations. Further, the stretching amount at that time is proportional to the moving amount of the clamping unit. Therefore, by independently controlling the movement of each clamping unit, it is possible to independently set the thickness dimension of two or more regions of the metal plate to the desired thickness dimension. Controlling the movement of the clamping unit, which consists of a pair of clamping members, is easier than controlling the gap between rolling rolls, and high-speed movement is relatively easy, so overall it is superior in mass production. In addition, since it is basically sufficient to have the clamping units and a device (moving device) for moving these clamping units in a desired manner, the manufacturing apparatus can be constructed easily without worrying about an increase in size. As described above, according to the manufacturing method of the present invention, it is possible to mass-produce a differential thickness metal plate integrally having a plurality of portions with different thickness dimensions using simple equipment.

As described above, according to the method for manufacturing a metal plate with different thickness and the apparatus for manufacturing a metal plate with different thickness according to the present invention, it is possible to mass-produce a metal plate with different thickness integrally having portions with different thickness dimensions with simple equipment. becomes possible.

BRIEF DESCRIPTION OF THE DRAWINGS It is a front view which shows the structure of the manufacturing apparatus of the differential-thickness metal plate which concerns on 1st embodiment of this invention. FIG. 2 is a plan view of a main part of the manufacturing apparatus shown in FIG. 1; FIG. 3 is a main part front view for explaining an example of a method of manufacturing a differential thickness metal plate using the manufacturing apparatus shown in FIGS. FIG. 3 is a front view of a main part for explaining an example of a method for manufacturing a metal plate of different thickness using the manufacturing apparatus shown in FIGS. FIG. 10 is a front view of a main part showing a state in which movement of a predetermined distance in a direction has been completed; FIG. 2 is a front view of a main part for explaining a method of manufacturing a metal plate with different thicknesses according to a second embodiment of the present invention, showing a state in which a region between portions of the metal plate sandwiched by the sandwiching units is stretched by the same amount; It is a principal part front view shown. FIG. 11 is a front view of a main part for explaining a method for manufacturing a metal plate of different thickness according to the third embodiment of the present invention, in which a part of the region between the portions of the metal plate sandwiched by the sandwiching units is first stretched; It is a principal part front view which shows a state. FIG. 10 is a front view of a main part for explaining a method for manufacturing a metal plate with a different thickness according to a fourth embodiment of the present invention; is a front view of a main part showing a state in which the is sandwiched.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the apparatus for manufacturing a metal plate with different thicknesses and the method for manufacturing a metal plate with different thicknesses according to the first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a front view of a manufacturing apparatus 10 for manufacturing metal sheets of different thickness according to this embodiment. The manufacturing apparatus 10 includes clamping units 12a to 12d having a pair of clamping members 11a to 11d, a moving device 13, and a support section . Details of each element will be described below. In the following description, the plane direction of the metal plate W as a work is defined as the X direction and the Y direction, and the thickness direction of the metal plate W is defined as the Z direction. Also, the arrangement direction of the clamping units 12a to 12d is defined as the X direction.

Each of the clamping units 12a-12d has a pair of clamping members 11a-11d. Here, each of the pair of holding members 11a to 11d is positioned on both sides of the metal plate W, and can hold a predetermined position of the metal plate W in the X direction by being close to each other. In this embodiment, as shown in FIG. 2, the metal plate W is in contact with the holding members 11a to 11d over the entire Y direction. It is held by a pair of holding members 11a to 11d.

Each of the clamping members 11a to 11d has a predetermined shape at its tip. In the present embodiment, each tip end surface has a flat shape and is in surface contact with the metal plate W as the work.

The moving device 13 can independently move the clamping units 12a to 12d configured as described above, more specifically, a plurality of pairs of clamping members 11a to 11d. Here, taking the leftmost first clamping unit 12a in FIG. controlled by Further, when the pair of holding members 11a, 11a move in the X direction, the pair of holding members 11a, 11a are controlled so as to be synchronously movable. Movements of the other clamping units 12b to 12d and pairs of clamping members 11b to 11d are also controlled by the moving device 13 in the same manner as the first clamping unit 12a. In this embodiment, the movement of the plurality of pairs of holding members 11a to 11d in the Z direction can also be controlled by the moving device 13. FIG. Of course, a drive mechanism different from the moving device 13 may be used to control the clamping members 11a to 11d so as to be movable in the Z direction.

Any known drive mechanism can be applied as the moving device 13, and for example, a drive mechanism capable of numerical control is suitable. One example is a drive mechanism such as a servomotor that can be numerically controlled electrically. In this case, a servomotor may be connected to each of the holding members 11a to 11d to enable independent drive control.

The support portion 14 supports the metal plate W at a plurality of locations in the X direction of the metal plate W, as shown in FIG. 1, for example. Although illustration is omitted, these support portions 14 are movable in the X direction by a predetermined driving device. Therefore, when the clamping units 12a to 12d, which will be described later, move in the X direction, the support part 14 can move to a position where it avoids interference with the clamping units 12a to 12d while maintaining the state of supporting the metal plate W. .

Next, an example of a metal plate manufacturing method using the differential thickness metal plate manufacturing apparatus 10 according to the present embodiment will be described mainly with reference to FIGS. 3 and 4. FIG.

(S1) Holding Step First, as shown in FIG. 3, each pair of holding members 11a to 11d of each holding unit 12a to 12d are arranged at predetermined positions X0a to X0d in the X direction. Then, the pair of holding members 11a to 11d are brought closer to each other to hold the portion of the metal plate W disposed between the pair of holding members 11a to 11d.

(S2) Stretching step Then, from the state shown in FIG. 3, each pair of clamping members 11a to 11d is moved in a predetermined direction along the X direction, so that each pair of clamping members 11a to 11d of the metal plate W is stretched. Regions Wab, Wbc, and Wcd between portions Wa to Wd sandwiched by 11d (hereinafter referred to as regions Wab, Wbc, and Wcd between portions to be sandwiched) are stretched. In this embodiment, the second clamping unit 12b (the pair of clamping members 11b, 11b) clamping the metal plate W at the position X0b in FIG. The third clamping unit 12c (a pair of clamping members 11c, 11c) adjacent to 12b in the X direction and clamping the metal plate W at position X0c is moved toward the fourth clamping unit 12d. Further, the first clamping unit 12a (the pair of clamping members 11a, 11a) adjacent to the second clamping unit 12b in the X direction and clamping the metal plate W at the position X0a is moved away from the second clamping unit 12b. At the same time, the fourth clamping unit 12d (a pair of clamping members 11d, 11d) adjacent to the third clamping unit 12c in the X direction and clamping the metal plate W at the position X0d is moved away from the third clamping unit 12c. .

Regarding the above-described movement of the clamping units 12a to 12d in the X direction, the timing and movement speed of each clamping unit 12a to 12d are basically arbitrary. When moving in the same direction, it is preferable to adjust the movement start timing and movement speed so that the region Wab between the portions Wa and Wb clamped by the clamping units 12a and 12b is not compressed. In this embodiment, for example, the first and second clamping units 12a and 12b are started to move at the same moving speed and at the same time. Also, the third and fourth clamping units 12c and 12d start moving simultaneously at the same moving speed. In this case, the first clamping unit 12a having a relatively long moving distance continues to move even after the movement of the second clamping unit 12b is completed. Similarly, the fourth clamping unit 12d, which has a relatively long movement distance, continues to move even after the movement of the third clamping unit 12c is completed.

By the above operation, the regions Wab, Wbc, and Wcd between the clamped portions are stretched according to the amount of movement of the clamping units 12a to 12d. Here, as shown in FIG. 4, when the moving amounts of the clamping units 12a to 12d in the X direction are Sa, Sb, Sc, and Sd, respectively, the stretching amounts of the clamped portion-to-portion regions Wab, Wbc, and Wcd are respectively It is expressed as Sa-Sb, Sb+Sc, and Sd-Sc. In other words, the distances Lab, Lbc, and Lcd between the clamping units 12a to 12d before being stretched (the state shown in FIG. 3) and the distance Lab' between the clamping units 12a to 12d after being stretched (the state shown in FIG. 4). , Lbc', and Lcd' are elongated by the stretching amounts Sa-Sb, Sb+Sc, and Sd-Sc, respectively. Further, since there is a correlation between the stretching amount and the thickness dimension, by setting the stretching amounts Sa-Sb, Sb+Sc, and Sd-Sc to predetermined sizes, the regions between the pinched portions Wab, Wbc, The thickness dimension tab, tbc, tcd of Wcd can be set to a predetermined size. For example, as shown in FIG. 4, in order to satisfy tab<tcd<tbc, the movement amounts Sa to Sd of the clamping units 12a to 12d are adjusted by the moving device 13 so that Sa−Sb>Sd−Sc>Sb+Sc. It may be controlled to a predetermined size. In this case, a metal plate W (difference-thickness metal plate) integrally having portions with different thicknesses t0, tab, tbc, and tcd is obtained. Of course, it should be taken into consideration that the metal plate W is elastically restored by a predetermined distance in the X direction by canceling the state in which the clamping force is applied by each pair of clamping members 11a to 11d during the stretching operation described above. , it is important to set the amount of movement in the X direction of each of the clamping units 12a to 12d. The same applies to a second embodiment, which will be described later.

As described above, in the metal plate manufacturing apparatus 10 according to the present embodiment, the clamping units 12a to 12d having the pair of clamping members 11a to 11d are arranged at three or more locations along the plane of the metal plate W in a predetermined direction (here , four positions in the X direction), and three or more clamping units 12a to 12d clamp the metal plate W. As shown in FIG. Further, the plurality of clamping units 12a to 12d are moved so that the distances Lab, Lbc, and Lcd between the clamping units 12a to 12d adjacent to each other in a predetermined direction are increased at two or more locations (here, all three locations), The regions Wab, Wbc, and Wcd between the portions Wa to Wd of the metal plate W held by the holding units 12a to 12d are stretched at two or more points, and the stretching amounts Sa-Sb, Sb+Sc, and Sd-Sc at this time are stretched. to be controlled individually. As described above, according to the manufacturing method of the present invention, only by moving the clamping units 12a to 12d that clamp the metal plate W, the parts Wa to Wd clamped by the clamping units 12a to 12d are used as a reference. The partitioned predetermined regions of the metal plate W (regions Wab, Wbc, Wcd between the clamped portions) can be stretched at two or more locations. Further, when there is no slip in the X direction between each pair of clamping members 11a to 11d and the metal plate W as in this embodiment, the amount of stretching of the metal plate W depends on the movement of each clamping unit 12a to 12d. When the amounts are Sa to Sd, they can be calculated as Sa-Sb, Sb+Sc, and Sd-Sc. Therefore, by independently controlling the movements of the clamping units 12a to 12d, it is possible to independently set the thickness dimensions tab, tbc, and tcd of two or more regions of the metal plate W to desired thickness dimensions. Become. Controlling the movement of the clamping units 12a to 12d is easier than controlling the gap between the rolling rolls, and high-speed movement is relatively easy, so overall it is advantageous in terms of mass production. In addition, since it is basically sufficient to have the clamping units 12a to 12d and a device (moving device 13) for moving these clamping units 12a to 12d in a desired manner, the manufacturing apparatus 10 can be easily constructed and increased in size. No worries. As described above, according to the manufacturing method according to the present invention, it is possible to mass-produce the differential thickness metal plate W (see FIG. 4) integrally having a plurality of portions with different thickness dimensions t0, tab, tbc, and tcd using simple equipment. becomes possible.

An embodiment (first embodiment) of the present invention has been described above. It is also possible to adopt the configuration of

For example, in the above embodiment, the four clamping units 12a to 12d are moved synchronously and at the same speed in the X direction. FIG. 5 shows a front view of a main part for explaining a method of manufacturing a differential thickness metal plate according to one example (second embodiment of the present invention). That is, in the manufacturing method according to the present embodiment, in the stretching step S2, among the three inter-pinched portion regions Wab, Wbc, and Wcd, three inter-pinch portion regions Wbc, which are stretched the smallest, are stretched. The regions Wab, Wbc, and Wcd between the clamped portions are stretched by the same amount (first stretching step S21), and thereafter, between the other two clamped portions excluding the region between the clamped portions Wbc having the smallest stretching amount. The regions Wab and Wcd are further stretched to the final stretching amount (second stretching step S22). In this case, in the first stretching step S21 (the step of stretching from the state shown in FIG. 3 to the state shown in FIG. 5), the X-direction distances Lab, Lbc, and Lcd between the clamping units 12a to 12d increase by the same amount. When the amounts of movement of the clamping units 12a to 12d in the X direction are Sa', Sb, Sc, and Sd', respectively, the stretching amounts of the regions between the clamped portions Wab, Wbc, and Wcd are Sa'-Sb and Sb+Sc, respectively. , Sd'-Sc, and Sa'-Sb=Sb+Sc=Sd'-Sc.

After that, only the regions Wab, Wbc between the clamped portions on both sides in the X direction are further stretched, and the regions Wab, Wcd between the clamped portions are stretched by the final stretching amounts Sa-Sb, Sd-Sc (see FIG. 4). (second stretching step S22). As a result, the clamped portion-to-portion regions Wab, Wbc, and Wcd are stretched to the same length as in the first embodiment.

Thus, by dividing the stretching step S2 into two steps (the first stretching step S21 and the second stretching step S22) and stretching the metal plate W, the differential thickness metal plate W having a predetermined thickness dimension distribution (Fig. 4 ) can be obtained. Although illustration is omitted, when the final stretching amounts Sa−Sb and Sd−Sc differ between one sandwiched portion region Wab and the other sandwiched portion region Wcd, a second stretching is performed. Step S22 is divided into two steps, first, the remaining two inter-pinched portion regions Wa and Wcd are stretched by the same amount in accordance with the inter-pinched portion region Wcd, which is stretched by a small amount, and then the remaining one portion is stretched. The clamped portion-to-portion region Wab may be further stretched to the final stretching amount.

FIG. 6 shows a front view of a main part for explaining a method of manufacturing a differential thickness metal plate according to still another example (third embodiment of the present invention). In the manufacturing method according to the present embodiment, among the three inter-pinched portion regions Wab, Wbc, and Wcd, only the inter-pinched portion region Wbc, which has the smallest stretching amount, is stretched to the final stretching amount (first Stretching step S21'). Further, the clamping units 12a and 12d on both sides in the X direction are moved in the X direction so that the remaining two regions between the clamped portions Wab and Wcd are neither stretched nor crushed (compressed in the X direction). Let Then, the remaining two inter-part-to-be-held regions Wab and Wcd are stretched until reaching the final stretching amount (second stretching step S22'). In this case, in the first stretching step S21′ (the step of stretching from the state shown in FIG. 3 to the state shown in FIG. 6), the X-direction distance Lbc′ between the second clamping unit 12b and the third clamping unit 12c is the same as that before stretching. While the X-direction distance Lbc is increased by the final stretching amount Sb+Sc, the X-direction distance Lab between the first clamping unit 12a and the second clamping unit 12b and the third clamping unit 12c and the fourth clamping The X-direction distance Lcd between the units 12d is the same as the X-direction distances Lab and Lcd before stretching. In other words, these X-direction distances Lab' and Lcd' are constant (do not increase or decrease) before and after the first stretching step S21'.

After that, only the regions Wab and Wcd between the clamped portions on both sides in the X direction are stretched, and the regions between the clamped portions Wab and Wcd are given final stretching amounts Sa-Sb and Sd-Sc (see FIG. 4). (second stretching step S22'). As a result, the clamped portion-to-portion regions Wab, Wbc, and Wcd are stretched to the same length as in the first embodiment.

By dividing the stretching step S2 into two steps (the first stretching step S21′ and the second stretching step S22′) and stretching the metal plate W in this way, the differential thickness metal plate W having a predetermined thickness dimension distribution (Fig. 4) can be obtained.

In addition, it is of course possible to employ other stretching modes other than the stretching mode described above. That is, as long as the distance between the clamping units 12a (12b, 12c) and 12b (12c, 12d) adjacent in the X direction increases, the manner in which the clamping units 12a to 12d move in the X direction is arbitrary.

Further, in the clamping step S1, for example, as shown in FIG. 7, portions Wa to Wd of the metal plate W clamped by the respective clamping units 12a to 12d may have predetermined thicknesses ta to td, respectively. That is, when each pair of clamping members 11a to 11d constituting each clamping unit 12a clamps a predetermined portion of the metal plate W in the X direction, the clamping force by each pair of clamping members 11a to 11d is adjusted to adjust each clamping force. The thickness dimensions ta to td of the portions Wa to Wd sandwiched by the units 12a to 12d may be individually adjusted. At this time, for example, by averaging the thickness dimensions tab, tbc, and tcd of the regions Wab, Wbc, and Wcd between the clamped portions adjacent on both sides in the X direction, the regions Wab, Wbc, and Wcd between the clamped portions are smoothed. can be connected to

In this way, in a state in which the holding units 12a to 12d hold the metal plate W so as to have a predetermined thickness, each holding unit 12a to 12d is moved in the X direction as in the above embodiment. The sandwiched portion regions Wab, Wbc, and Wcd are stretched until they reach predetermined thickness dimensions tab, tbc, and tcd. This also makes it possible to obtain the differential thickness metal sheet W having the thickness dimension distribution shown in FIG. According to the manufacturing method according to the present embodiment, the clamped portions Wa to Wd of the metal plate W and the regions Wab, Wbc, and Wcd between the clamped portions can be individually made to have predetermined thickness dimensions. It is possible to further increase the degree of freedom in forming the thick metal plate.

Note that it is of course possible to employ other clamping modes other than the clamping mode described above. That is, as long as the regions Wab, Wbc, and Wcd between the portions to be clamped of the metal plate W can be stretched in the X direction at two or more locations, the clamping modes of the clamping units 12a to 12d are arbitrary.

Further, in the above-described embodiment, the end surfaces of the holding members 11a to 11d are flat, but the shape is not limited to this. For example, a predetermined three-dimensional shape may be a shape that can be transferred to the clamped portions Wa to Wd.

Further, in the above-described embodiment, the tip end surface of each of the holding members 11a to 11d is connected to the side surface of each of the holding members 11a to 11d by a curved surface having an R-shaped cross section. can be adopted. For example, although not shown, the end surfaces of the holding members 11a to 11d may be connected to the side surfaces of the holding members 11a to 11d with tapered inclined surfaces.

Further, in the above description, four clamping units 12a to 12d (that is, four pairs of clamping members 11a to 11d) are used, and the three regions Wab, Wbc, and Wcd between the clamped portions are adjusted to a predetermined thickness dimension. Although the case of stretching has been exemplified, it is of course not limited to this. The number of clamping units is arbitrary as long as two or more regions between the clamped portions can be stretched.

Further, in the above description, the metal plate W to be the work is illustrated as having a long rectangular shape, and three or more clamping units 12a to 12d are arranged along the lengthwise direction of the metal plate W. Although the case is illustrated (see FIG. 2, etc.), it is of course not limited to this. For example, three or more clamping units may be arranged along the short side direction of a rectangular metal plate.

Further, from the above description, the present invention is suitable for steel sheets with different thicknesses used for structural materials for automobiles, but it is of course not limited to this. For example, the present invention may be applied to a differential thickness metal plate made of a material other than steel. In terms of usage, the present invention may be applied to differential thickness metal sheets for uses other than structural materials, and moreover, to differential thickness metal sheets for uses other than automobiles. .

10 manufacturing devices 11a, 11b, 11c, 11d clamping members 12a, 12b, 12c, 12d clamping unit 13 moving device 14 support part Lab, Lbc, Lcd distance in X direction (between adjacent clamping units)
Sa, Sb, Sc, Sd Movement amount in X direction (clamping unit)
t0, ta, tb, tc, td, tab, tbc, tcd Thickness dimension W Metal plates Wa, Wb, Wc, Wd Clamped portions Wab, Wbc, Wcd Areas between clamped portions X0a, X0b, X0c, X0d X-direction position (Clamping unit)

Claims (3)

A clamping unit having a pair of clamping members and capable of clamping a metal plate as a work is arranged at three or more locations in a predetermined direction along the plane of the metal plate, and the metal plate is clamped in the predetermined direction by the clamping unit. A sandwiching step of sandwiching at three or more locations;
The plurality of clamping units are moved such that the distance between the clamping units adjacent to each other in the predetermined direction increases at two or more locations, and the area between the portions of the metal plate clamped by the clamping units is increased. and a stretching step of stretching at two or more locations,
A method for producing a differential thickness metal plate, wherein in the stretching step, a differential thickness metal plate having a predetermined thickness dimension distribution is formed by individually controlling the amount of stretching of the regions between the clamped portions. 2. The manufacturing of metal sheets of different thickness according to claim 1, wherein in said clamping step, the thickness dimension of said clamped portion of said metal plate is individually adjusted by controlling clamping force of said clamping unit for clamping said metal plate. Method. a clamping unit having a pair of clamping members and capable of clamping a metal plate as a workpiece, wherein three or more clamping units are arranged at three or more locations in a predetermined direction of the metal plate;
a moving device capable of moving the plurality of clamping units so that the distance between the clamping units adjacent to each other in the predetermined direction increases at two or more locations;
The moving device is capable of moving the plurality of clamping units clamping the metal plate so as to stretch the region between the clamped portions at two or more points, and An apparatus for manufacturing a differential thickness metal plate, which is configured to be able to individually control the amount of stretching in the region between them.

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