KR100419776B1 - Tools for manufacturing a doubly curved sheet metal and apparatus including it and method for manufacturing the sheet metal using them - Google Patents

Abstract

The present invention relates to a molding tool that is used to form a plate having a double curvature by continuously pressing the sheet using the bending deformation principle of the metal sheet, the molding tool 100 of the present invention is movable to the pedestal 105 Two pairs of supporting rolls 102 fixed to each other and horizontally supporting the plate 101, and one central roll 103 fixed to the housing 106 and vertically pressing the plate 101 to change bending. It includes. The molding tool of the present invention shortens the molding time and prevents the loss of the plate by forming a plate having a double curvature by pressing the plate continuously without restraining the plate through two pairs of supporting rolls and one center roll. There is.

Description

Forming tool for forming a sheet having a double curvature, a molding apparatus having the same and a method for forming a sheet using the sheet {{Tools for manufacturing a doubly curved sheet metal and apparatus including it and method for manufacturing the sheet metal using them}

The present invention relates to a molding tool used to form a plate having a double curvature by continuously pressing the plate using the bending deformation principle of the metal plate. The present invention also relates to a molding apparatus for molding a plate having a double curvature using the molding tool. The present invention also relates to a method of molding a plate having a double curvature by using a molding apparatus having the molding tool.

Metal plate is used in many fields such as home appliances, automobiles, ships, aircraft, etc. However, the metal plate used in this field is not only a flat plate, but also a metal plate having a double curvature.

Thus, conventionally, the following known techniques have been used to mold the metal sheet having such a double curvature.

Korean Patent Application No. 99-027227 discloses a technique for "an apparatus for forming a sheet material having a double curvature and its molding method". This apparatus constituted a molding tool with two pairs of support punches and one center punch. In addition, the method was used to form a sheet through an incremental forming process using the principle of bending deformation of the sheet. That is, in order to form the whole plate, the above technique is to press the plate with the center punch to generate bending deformation, and then press the plate again to adjust the position, and then press the plate again to generate the bending change. Had to do work. Therefore, the above technique has a problem in that a molding period for forming a sheet material is lengthened.

In addition, a technique related to a molding apparatus for forming a sheet material using a stretch-expanding principle using CNC machine tools is known in the art (Incremental Sheet Metal Stretch-Expanding with CNC Machine Tools / K. Kitazawa / Proceeding of the Fourth International Conference on Technology of Plasticity, pp. 1899-1904. However, since this technique forms a plate by the stretching principle, there is a fear that the thickness deformation occurs badly and the product is torn. In addition, this technique forms a sheet having a curvature by using a cylindrical tool in a state where the sheet is fixed by a blank holder. Therefore, this technique has a problem that material loss as much as that portion is generated because the portion fixed by the blank holder is not molded.

Accordingly, the present invention has been made to solve the problems of the prior art as described above, by using the bending deformation principle of the metal plate to provide a molding tool used to form a plate having a double curvature by pressing the plate continuously. Its purpose is to.

Another object of the present invention is to provide a molding apparatus which shortens the molding time and prevents the loss of the sheet by molding the sheet having a double curvature without restraining the sheet metal using the molding tool.

In addition, another object of the present invention is to provide a method for molding a plate having a double curvature capable of minimizing thickness deformation by using a molding apparatus having the molding tool.

Figure 1a is a perspective view showing the overall shape of a molding tool for molding a plate having a double curvature according to an embodiment of the present invention,

FIG. 1B is a perspective view showing a state immediately before molding in which a metal sheet is placed in the molding tool shown in FIG. 1A;

Figure 1c is a front view showing the internal coupling relationship of the center roll of the forming tool shown in Figure 1a,

Figure 2 is a perspective view showing the overall shape of a molding tool for molding a plate having a double curvature according to another embodiment of the present invention,

3 is a schematic view schematically showing a molding apparatus of the present invention having the molding tool shown in FIGS. 1A and 2,

4 is a process chart showing a process of molding a plate using the molding apparatus shown in FIG.

5 is a photograph of a plate having a double curvature molded by using the molding apparatus shown in FIG.

♠ Explanation of symbols on the main parts of the drawing ♠

100, 200: molding tools 101, 310: metal sheet

102, 202, 306: Support roll 103, 203, 308: Center roll

104, 204, 311: motor 105, 205, 307: roll support

106, 206, 309: housing 107, 109, 112: axis of rotation

108, 110, 111: gear 300: forming apparatus

301: fixed table 302: X-axis table

303: Y-axis table 304: Z-axis table

305: control device

Molding tool according to an embodiment of the present invention for achieving the above object, is fixed to the pedestal and is supported in two pairs of supporting rolls for supporting the plate horizontally, rotatably fixed housing and the plate It is characterized in that it comprises a central roll for pressing and bending deformation vertically.

In addition, the molding apparatus according to another embodiment of the present invention, the fixed frame, the X axis, Y axis and Z axis table respectively movable in the X-axis, Y-axis and Z-axis direction of the spatial coordinate system with respect to the fixed frame, A control device for respectively controlling movement of the tables, wherein two pairs of support rolls are fixed to the X-axis table to support the plate horizontally; The housing fixed to the fixed frame rotatably includes one center roll for vertically pressing the plate and bending deformation, a motor providing driving force to the center roll, and a plurality of transferring driving force of the motor to the center roll. The gear is characterized in that it is installed.

According to another embodiment of the present invention, a molding method includes a fixed frame, a center roll installed in a housing fixed to the fixed frame so as to be rotatable vertically and rotating through a driving force of a motor, an X axis of a spatial coordinate system, Forming a sheet having a double curvature in a sheet forming apparatus consisting of two pairs of supporting rolls installed on the movable tables movable in the Y-axis and Z-axis directions, and a control device for controlling the space movement of the movable tables. A first step of placing a plate on two pairs of supporting rolls installed on a horizontal moving table, a second step of moving the moving table a predetermined distance vertically upwards, and the center roll pressing the plate vertically downward, and the center roll A third step of forming a curvature line on the plate by rotating the space between the center roll and the plate, and moving the moving table forward, backward, left, and right; A fourth step of moving and rotating the housing; a fifth step of closely contacting the center roll and the plate and forming the other curvature lines on the plate by rotating the center roll; and the third to fifth steps. It characterized by comprising a sixth step of repeatedly bending the entire surface of the plate material by repeating.

In the following, with reference to the accompanying drawings, a preferred embodiment of a molding tool for forming a plate having a double curvature according to the present invention, a molding apparatus having the same and a method of forming a plate using them.

Figure 1a is a perspective view showing the overall shape of a molding tool for molding a plate having a double curvature according to an embodiment of the present invention, Figure 1b is a state immediately before molding the metal plate is placed on the molding tool shown in Figure 1a FIG. 1C is a front view showing the inner coupling relationship of the center roll of the molding tool shown in FIG. 1A.

As shown in FIGS. 1A to 1C, the molding tool 100 of the present invention includes two pairs of supporting rolls 102 which horizontally support the metal plate 101 and the metal plate 101 vertically. It consists of one center roll 103 which presses, and the motor 104 which provides the driving force which rotates the center roll 103. As shown in FIG. The two pairs of supporting rolls 102 are composed of four rolls in total and are fixed to the roll pedestals 105, respectively. In addition, the two pairs of support rolls 102 are fixed to the roll pedestal 105 so as to be movable forward, backward, left and right. That is, the two pairs of support rolls 102 move back, front, left, and right, thereby adjusting the size of the quadrangle formed by the two pairs of support rolls 102. Adjusting the size of the square in this way is to control the degree of bending deformation of the plate (101).

In addition, one center roll 103 is fixed to the housing 106 through the rotation shaft 107, the driven gear 108 is fixed to the rotation shaft 107. In addition, the drive gear 110 is fixed to the rotation shaft 109 of the motor 104, and the drive gear 110 and the driven gear 108 are connected to the connection gear 111 fixed to the rotation shaft 112. Therefore, the center roll 103 is rotated by the driving force of the motor 104 through the plurality of gears 110, 111, 108.

The surfaces of the supporting roll 102 and the center roll 103 have a spherical surface having the same radius a of the arc of the roll cross section and a rotation radius b of the arc of the roll cross section.

Figure 2 is a perspective view showing the overall shape of a molding tool for molding a plate having a double curvature according to another embodiment of the present invention.

As shown in FIG. 2, the other forming tool 200 of the present invention is the same as the forming tool 100 shown in FIG. 1A except that the shape of the supporting roll 202 and the center roll 203 is different. It is composed. That is, the two pairs of support rolls 202 are respectively fixed to the roll pedestal 205 and are fixed to the roll pedestal 205 so as to be movable back and forth, left and right. Moreover, one center roll 203 is fixed to the housing 206 which supports this center roll 203. In addition, the center roll 203 is rotated by the driving force of the motor 204 through a plurality of gears (not shown).

The surfaces of the supporting roll 202 and the center roll 203 have a toroidal surface or spherical surface, in which the radius a of the arc of the roll cross section and the rotation radius b of the arc of the roll cross section are not the same. .

The molding tools 100 and 200 of the present invention configured as described above are bent on the metal plate 101 by pressing the metal rolls 101 and 203 vertically on the metal plate 101 placed on the support rolls 102 and 202, respectively. Maintain contact with deformation. In the meantime, the center rolls 103 and 203 rotate about the rotation shaft 107 in the housings 106 and 206 at the correct positions through the driving force of the motors 104 and 204. Therefore, the metal plate 101 is conveyed through the support rolls 102 and 202 in the rotational direction of the center rolls 103 and 203 while causing bending deformation. Through such a process, the metal plate 101 has a double curvature.

FIG. 3 is a schematic diagram schematically showing a molding apparatus of the present invention having the molding tool shown in FIGS. 1A and 2.

As shown in FIG. 3, the molding apparatus 300 of the present invention includes a fixed frame 301. The fixed frame 301 is provided with a Z-axis table 304 that moves in the Z-axis direction. The Z-axis table 304 is provided with a Y-axis table 303 that moves in the Y-axis direction. The Y-axis table 303 is provided with an X-axis table 302 moving in the X-axis direction. The X-axis, Y-axis, and Z-axis tables 302, 303, and 304 thus configured are operated by the driving force of each motor (not shown), and these motors are controlled by the controller 305, respectively.

The X-axis table 302 is provided with a roll base 307 to which two pairs of support rolls 306 are fixed, respectively. The housing 309 to which one center roll 308 is fixed is coupled to the fixed frame 301. At this time, the housing 309 is rotatably fixed with respect to the fixed frame 301.

The two pairs of backing rolls 306 and one center roll 308 are identical to the backing rolls 102 or 202 and center rolls 103 or 203 shown in FIG. 1A or FIG. 2. In addition, two pairs of support rolls 306 and one center roll 308 are fixed to the roll pedestal 307 and the housing 309 in the form as shown in FIG. 1C or FIG. 2, respectively. However, the two pairs of support rolls 306 may not be fixed to the roll base 307 but may be directly fixed to the X-axis table 302. At this time, the two pairs of supporting rolls 306 are fixed to the X-axis table 302 in such a manner as to be movable forward, backward, left and right, as fixed to the roll pedestal 307.

Hereinafter will be described in detail the operation of the molding apparatus of the present invention configured as described above.

First, as shown in FIG. 3, the metal plate 310 to be molded is placed on the upper portion of the two pairs of supporting rolls 306, and the control device 305 measures the size of the depth at which bending deformation is performed in one operation. Enter in and start the operation. Then, the X-axis and Y-axis tables 302 and 303 move so that the center roll 308 is located at the center of the square formed by the two pairs of support rolls 306.

Then, the Z-axis table 304 is moved vertically by the control of the controller 305 to press the metal plate 310 to a depth such that the center roll 308 is bent and deformed in one operation. Then, the bending of the metal plate 310 occurs due to the force acting between the support roll 306 and the center roll 308. When the motor 311 is operated in this state, the center roll 308 is rotated at the correct position, and the metal plate 310 is transferred in the rotational direction of the center roll 308 while causing bending deformation. Therefore, one continuous curvature line is formed in the metal plate 310 through which the center roll 308 has passed.

When one curvature line is formed on the metal sheet 310 in this way, the X, Y, Z axes tables 302, 303, and 304 are moved to form another continuous curvature line on the metal sheet 310. A metal plate 310 having a double curvature having a depth is manufactured.

Although the molding apparatus of the present invention described above forms the metal plate 310 having a double curvature by operating the Z axis table 304 up and down, the Z axis table 304 is fixed and the center roll 308 is Z axis. The metal plate 310 having a double curvature may be formed by configuring to operate in the direction.

The molding apparatus of the present invention adjusts the degree of bending of the metal plate 310 by adjusting the distance between the two pairs of supporting rolls 306 or the depth pressed by the center roll 308.

Hereinafter, a method of forming a plate having a double curvature using the molding apparatus of the present invention will be described in detail.

4 is a process diagram illustrating a process of forming a plate using the molding apparatus shown in FIG. 3, and FIG. 5 is a photograph of a plate having a double curvature formed by using the molding apparatus illustrated in FIG. 3.

As shown in FIG. 4, the space | interval between two pairs of support rolls 306 provided on the X-axis table 302 is first adjusted, and the metal plate 310 is then placed on the two pairs of support rolls 306. Then, the X-axis table 302 and the Y-axis table 303 are moved so that the center roll 308 is located at the center of the square formed by the two pairs of support rolls 306, and then the Z-axis table 304 ) Is moved vertically a predetermined distance so that the center roll 308 fixed to the housing 309 presses the metal plate 310 vertically downward. In this state, the center roll 308 is rotated through the operation of the motor 311 to form one continuous curvature line on the metal plate 310 in the X-axis direction.

Then, the Z-axis table 304 is moved vertically downward to separate the center roll 308 and the metal plate 310. In this state, the housing 309 is rotated 90 degrees and the Z-axis table 304 is moved vertically to closely contact the center roll 308 and the metal plate 310. Then, the operation of the motor 311 is performed. The center roll 308 is rotated to move the metal sheet 310 at a predetermined distance d in the Y-axis direction, and then the Z roll table 304 is moved vertically downward to move the center roll 308 and the metal sheet 310. )). In this state, the housing is rotated 90 degrees and the Z-axis table 304 is moved vertically upward to bring the center roll 308 and the metal sheet 310 back into close contact. Then, the center roll 308 is rotated in the direction opposite to the previously rotated direction to form a second continuous curvature line in the X-axis direction on the metal plate 310. By repeating the above method, the curvature of the metal plate 310 with respect to the X-axis direction is formed.

Then, the housing 309 is rotated 90 ° to bend deformation of the metal plate 310 in the Y-axis direction. Curvature formation of the metal plate 310 in the Y-axis direction is also formed through the same method as described above. In this way, the housing 309 is rotated by 90 ° and the rotational direction of the center roll 308 is configured to bend to deform the entire surface of the metal plate 310.

Then, the Z-axis table 304 is moved further vertically upward than the first, so that the center roll 308 causes the metal plate 310 to bend more deeply. By repeating the above process in this state, the entire surface of the metal plate 310 is bent and deformed once again. The entire surface bending deformation of the metal plate 310 as described above is repeated until a plate having a desired double curvature is formed. Even during the process of forming the curvature lines as described above, the double curvature of the metal plate 310 may be formed while adjusting the interval of the support roll 306 as necessary. In addition, a double curvature may be formed on the metal plate 310 while rotating the rotation angle of the housing at an angle of 90 ° or less (90 ° or less or 90 ° or more).

When forming a double curvature in the metal plate 310 in the above manner, it is preferable to divide the metal plate 310 in up, down, left and right, and to sequentially apply bending deformation from the inside to the outside of each compartment.

As described above, the present invention utilizes an incremental forming process in which the center roll 308 presses the metal plate 310 stepwise to form the metal plate 310. That is, in the present invention, after forming the entire range of the metal plate 310 in a state in which the center roll 308 is fixed at the depth for pressing the metal plate 310, the pressing depth is gradually increased. Then, a metal sheet having a double curvature as shown in FIG. 5 is molded.

As described in detail above, the molding apparatus of the present invention continuously presses the plate by using the bending deformation principle of the metal plate without restraining the metal plate by using a molding tool composed of two pairs of supporting rolls and one center roll. Molding a sheet having a curvature shortens the molding time and has an effect of preventing the loss of the sheet.

In addition, the molding apparatus of the present invention has the effect of minimizing the thickness deformation compared to the process of forming on the basis of the stretching (stretching) principle of the metal sheet by molding through the bending deformation principle of the plate.

In addition, the molding apparatus of the present invention has the effect of greatly reducing the mold cost by using a simple molding tool, without making a complicated mold for each product, such as a conventional stretching (deep-drawing) molding process. .

In addition, the molding apparatus of the present invention has a wide range of application from a thin metal sheet to a thick metal sheet forming a body of a home appliance, automobile, ship, aircraft, and the like.

In addition, since the molding apparatus of the present invention is a continuous molding process using a roll, it is possible to manufacture a product having a smoother surface than a discrete molding process using a punch.

In the above description of the molding tool for forming a plate having a double curvature of the present invention, a molding apparatus having the same, and a description of a method for forming a plate using the same, together with the accompanying drawings, this is illustrative of the best embodiment of the present invention. It is described as an example, but not limiting the present invention.

In addition, it is obvious that any person skilled in the art can make various modifications and imitations without departing from the scope of the technical idea of the present invention.

Claims (13)

In the molding tool for molding a plate having a double curvature, And two pairs of supporting rolls fixed to the pedestal and supporting the plate horizontally, and one center roll installed in the rotatably fixed housing and pressing and bending the plate vertically. Molding tool characterized by the above-mentioned. The molding tool according to claim 1, further comprising a motor for providing a driving force to the center roll, and a plurality of gears for transmitting the driving force of the motor to the center roll. The molding tool according to claim 1, wherein the two pairs of support rolls are movably fixed to the pedestal. 2. The molding tool according to claim 1, wherein the surface of the center roll is a spherical surface or a toroidal surface. A fixed frame, an X-axis, a Y-axis, and a Z-axis table that can be moved in the X, Y, and Z-axis directions of a spatial coordinate system, respectively, and a control device for controlling the movement of the tables, respectively. In the molding apparatus for molding a sheet material having a curvature, Two pairs of support rolls fixed to the X-axis table to support the plate horizontally; The housing fixed to the fixed frame rotatably includes one center roll for vertically pressing the plate and bending deformation, a motor providing driving force to the center roll, and a plurality of transferring driving force of the motor to the center roll. Molding apparatus characterized in that the gear is installed. 6. The molding apparatus according to claim 5, wherein a pedestal is fixed on the X-axis table, and the two pairs of support rolls are movably fixed to the pedestal. 6. The molding apparatus according to claim 5, wherein the surface of the center roll is a spherical surface or a toroidal surface. On a fixed frame, a center roll rotatably vertically fixed to the fixed frame, the center roll rotates through the driving force of the motor, and the movable tables movable in the X, Y, and Z axes of the spatial coordinate system. In the sheet forming apparatus consisting of a pair of supporting rolls installed, and a control device for controlling the movement of the space of the moving table, A first step of placing a plate on two pairs of supporting rolls installed on the top horizontal moving table, a second step of moving the moving table a predetermined distance vertically upwards, and pressing the plate vertically downwards by the center roll; A third step of forming a curvature line on the plate by rotating a roll, a fourth step of separating the center roll and the plate from each other, moving the moving table forward, backward, left and right, and rotating the housing; A fifth step of forming the other curvature lines on the plate by closely adhering the plate materials to each other and rotating the center roll, and a sixth step of bending the entire surface of the plate by repeating the third to fifth steps. Forming method of a plate having a double curvature, characterized in that it comprises a. The method of forming a plate having a double curvature according to claim 8, wherein the first step adjusts a gap between the two pairs of supporting rolls. The method of forming a plate having a double curvature according to claim 8, wherein after the first to sixth steps are completed, the moving table is further moved vertically, and the third to sixth steps are performed. The method for forming a plate having a double curvature according to any one of claims 8 to 10, wherein the forming paths drawn by the center roll on the plate are continuous. The method of forming a plate having a double curvature according to claim 8, wherein the housing is rotated at 90 ° or less in the fourth step. 9. The method of forming a plate having a double curvature according to claim 8, wherein an interval between said two pairs of supporting rolls is adjusted in said fourth step.