JPH06190452A - Double roll forming machine for material with large spring back - Google Patents

Abstract

PURPOSE:To enable a material having a large spring back to be bent into a circular-arc shape. CONSTITUTION:In a double roll forming machine 10, a roll 24 to be pressed is formed to an extremely small diameter, a supporting pressing member 26 of a rigid body bigger than the roll 24 and arranged in parallel with the roll 24 is provided with an inserting part 261 in the longitudinal direction, and the roll 24 to be pressed is inserted into it to be supported freely rotatably at several points in the longitudinal direction. Also, the rotary shaft 264 at one end of the supporting pressing member is supported freely rotatably and stoppably by a supporting mechanism 28; in addition, a pressing part 265 is provided on the side face in the longitudinal direction of the supporting pressing member; and the part 265 abuts on the inner circumferential surface of the material and presses the material to be worked at a desired position on the exit side where the material to be worked is released from the pressed state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the rotation of a large-diameter pressure roll equipped with an elastic body to rotate a pressed roll made of a small-diameter rigid body which comes into contact with the large-diameter pressure roll. In a roll forming machine (hereinafter, referred to as "two roll forming machine") that bends and forms a processed material into an arc shape in a direction in which one roll is wound, a metal cylinder using a processed material having a large springback. The present invention relates to manufacturing and providing molded articles.

[0002]

2. Description of the Related Art Conventionally, in a two-roll forming machine, there has been no technique for forming a metal working material having a large springback into a cylindrical shape. That is, depending on the conventional two-roll forming machine, it is not possible to process a metal cylindrical molded product having a diameter of 250φ using a metal processed material having a large springback, for example, a stainless processed material having a thickness of 0.2 mm. It was

The reason is that in order to obtain a metal cylindrical molded product having a diameter of 250φ by using a stainless material having a thickness of 0.2 mm, springback of the material is taken into consideration.
Using a 70φ pressed roll and 220 kg / c
Although it is necessary to apply a load of m, on the other hand, when a pressing force is applied between both rolls, there is a relation that the maximum deflection expressed by the following formula occurs, This is because, if an attempt is made to obtain a metal cylindrical molded product having a diameter of 1300 mm and a diameter of 250φ, the pressed roll will have a maximum deflection of 48 mm, and eventually it will be impossible to process. Ymax ⁼ 5WL 4/384 EI Ymax maximum deflection W etc. distributed load L roll length E modulus I elastic secondary moment

According to the above formula, in order to support a load of 220 kg / cm, a pressed roll of 170φ must be used. However, this pressed roll has a too large radius of curvature, and therefore has a diameter of 250φ. It is not possible to obtain a metal cylindrical molded product. Due to such a relationship, in the conventional two-roll forming machine, in view of the load-bearing capacity of the material of the pressed roll, as in the above example, the stainless steel having a large springback and a thickness of 0.2 mm is used. It has been considered that it is impossible to manufacture a metal cylindrical molded product having a diameter extremely smaller than the length, such as a length of 1300 mm and a diameter of 250φ, by using the processed material. Note that, for example, even a processed material of stainless steel having a large thickness, for example, a processed material of stainless steel having a thickness of 1 mm does not have a large springback.
It is possible to process, and it is also possible to process a thin processed material having a small springback, for example, an iron plate having a thickness of 0.2 mm.

[0005]

[Problems to be Solved by the Invention]

1 As described above, when it is attempted to form a metal working material having a large springback into a cylindrical shape by using the conventional two-roll forming machine, when a pressed roll having an appropriate diameter is used,
Since the roll bends, it becomes impossible to process it. On the other hand, the roll that can withstand the load cannot obtain a molded product having a small diameter because the diameter is too large. Therefore, in order to form a metal working material having a large springback into a cylindrical shape by using a two-roll forming machine, it is necessary to develop and provide a pressed roll which has a very small diameter but can withstand a large load. Become.

2. Incidentally, in the conventional two-roll molding machine, in order to obtain a molded product having a desired diameter, the material, hardness, shape (width, thickness) and the like of the processed material are slightly different. , A large number of pressed rolls with different diameters are required,
Preparing a large number of pressed rolls with different diameters in advance not only requires a great deal of expense, but it also takes many years to produce pressed rolls with slightly different diameters. It requires experience and advanced technology, and in addition, depending on the material, hardness, shape (width, thickness) etc. of the processed material when working, It takes a lot of work and time to decide the size, select the pressed roll, and if necessary, to manufacture this with many years of experience and advanced technology,
Solving this problem has been regarded as the biggest problem in the conventional two-roll molding machine.

With respect to this problem, the applicant of the present invention forms a work material into an arc shape in a direction in which one roll is wound by passing between two rolls which are pressed and rotated in a two roll forming machine, Then, on the outlet side where the processed material is released from the pressed state, a pressing member capable of adjusting the pressing position with respect to the processed material is provided between the processed material and the roll, whereby the passing processed material in the opposite direction. Invented a method of further forming by pressing and bending and solved the problem (Japanese Patent Publication No. 4-26927, Japanese Patent Application No. 6-26927).
0-148440).

The above method can be applied even when a work material having a large springback is bent into an arc shape.
It is necessary to develop and provide a device that can easily perform forming of a processed material without preparing many pressed rolls. The present invention intends to solve the above problems 1 and 2 all at once.

[0009]

SUMMARY OF THE INVENTION In order to solve the above problems 1 and 2 all at once, the present invention is a two-roll molding machine, in which a pressed roll has an extremely small diameter and is arranged in parallel with the pressed roll. The thicker supporting and pressing member is provided with a fitting portion in the longitudinal direction, and the pressed roll is fitted into the supporting and pressing member, and is rotatably supported at several points in the longitudinal direction. , Supported by a supporting mechanism so as to be rotatable and stopable, and provided with a pressing portion on the side surface in the longitudinal direction of the supporting pressing member, and at the desired position on the outlet side where the processed material is released from the pressed state, the inner peripheral surface of the processed material It is characterized by abutting against and pressing this. That is, in the two-roll forming machine of the present invention, 1 the pressed roll has an extremely small diameter, and the pressed roll has a fitting portion in the longitudinal direction on a thicker supporting and pressing member arranged in parallel with the roll. It is provided, and the pressed roll is fitted therein, and is rotatably supported at several points in the longitudinal direction. At the same time, 2 One end of the supporting and pressing member is rotatably stopped by a support mechanism and The pressing portion provided on the side surface of the member is configured to come into contact with and press the inner peripheral surface of the processed material at a desired position on the outlet side where the processed material is released from the pressed state.

[0010]

[Work]

1 By adopting the configuration of 1 above, even if a large load is applied to the pressed roll, the pressed roll is flexibly supported by the support pressing member at several points in the longitudinal direction, so that the pressed roll bends. And smooth rotation is possible. 2 By adopting the above-mentioned configuration 2, the processed material is passed between both rolls that rotate by pressing, thereby forming the processed material into an arc shape in a direction in which one roll is wound,
Then, on the outlet side where the processed material is released from the pressed state, the processed material that passes by the pressing portion of the support pressing member that can arbitrarily adjust the pressing position for the processed material provided between the processed material and the roll. Is further pushed and bent in the opposite direction to be further expanded, thereby further forming. This is exactly what the patented invention described above is implemented.

[0011]

EXAMPLES The constitution and operation of the present invention will be described below with reference to examples. As shown in FIGS. 1 and 2, the pressed roll 24 having an extremely small diameter is fitted into a fitting portion 261 provided in the longitudinal direction of a supporting and pressing member 26 of a thicker rigid body arranged in parallel with the roll. It is rotatably supported by bearings 262 provided at several points in the longitudinal direction of the fitting portion 261. As a result, the pressed roll 2
4 even if a large load is applied to the pressed roll 24
Is supported at several points in the longitudinal direction of the support pressing member 26, so that it can be smoothly rotated without bending. Further, as shown in FIG. 2, the support pressing member 26 is supported by the support mechanism 28 by the rotation shaft 264 provided on the end side thereof, and the support pressing member is pressed separately from the rotation of the pressed roll. The pressing portion 265 of the support pressing member is processed at a desired position on the outlet side, which is adjusted so as to be rotated in the circumferential direction of the roll and stopped at an arbitrary position, and the processing material is released from the pressed state. The inner peripheral surface of the material is brought into contact with and can be pressed.

With this structure, the work material is formed into an arc shape in the direction in which one roll is wound by passing between the two rolls which are pressed and rotated, and then the work material is released from the pressed state. At the desired position on the outlet side, the pressing portion 265 of the support pressing member is brought into contact with the inner peripheral surface of the processed material to press it, and the processed material passing therethrough is pushed and bent in the opposite direction to be further shaped and processed. Is to add. The supporting and pressing member has a cylindrical shape in the above embodiment, but may have a polygonal shape. Further, the shape of the fitting portion of the supporting and pressing member is U-shaped in the above embodiment, but it may be concave.

[0013]

As described above, first of all, the effect of the present invention is that the conventional two-roll forming machine manufactures and provides a metal cylindrical molded product using a processed material having a large springback. However, according to the present invention, it is possible to manufacture and provide a metal cylinder molded product using a processed material having a large springback. Secondly, in the conventional two-roll molding machine, in order to obtain cylindrical molded products having different diameters, it is necessary to prepare a large number of pressed rolls. By carrying out the method of the invention, even when using a processed material having a large springback, by rotating the supporting pressing member and changing the position of the pressed portion in contact with the processed material, a pressed roll is prepared. Then, it is possible to obtain cylindrical molded articles having different diameters without exchanging them. These effects are completely epoch-making since they cannot be obtained by the conventional two-roll forming machine.

[Brief description of drawings]

FIG. 1 is a side view of a pressed roll 24 and a supporting pressing member 26 according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a pressed roll 24 and a support pressing member 26 according to an embodiment of the present invention.

FIG. 3 is a side view of a pressing roll 22, a pressed roll 24, and a support pressing member 26 according to an embodiment of the present invention, showing a state in which a pressed material is pressed by a pressing portion 265 of the support pressing member 26.

FIG. 4 is a perspective view of the two-roll molding machine 10 according to the embodiment of the present invention.

[Explanation of Codes] 10 Two Roll Forming Machine 12 Frames 14, 16 Stand 22 Pressing Roll 24 Pressed Roll 26 Support Pressing Member 261 Fitting Part 262 Bearing 264 Rotating Shaft of Support Pressing Member 265 Pressing Part of Support Pressing Member 28 Support Mechanism 56 Drop end member

Claims (1)

[Claims] 1. When a large-diameter pressure roll is rotated, a small-diameter pressed roll that comes into contact with the large-diameter pressure roll is rotated, and the processed material is pressed by the peripheral surfaces of both rolls, so that one of the processed materials is wound. In a roll forming machine that bends and forms a circular arc in a direction, the pressed roll has an extremely small diameter, and the supporting pressing member of a thicker rigid body is provided in parallel with the pressed roll,
A fitting portion is provided in the longitudinal direction, the pressed roll is fitted into the fitting portion, and is rotatably supported at several points in the longitudinal direction, and one end of the supporting and pressing member is rotatably supported by a supporting mechanism. Further, a pressing portion is provided on the side surface in the longitudinal direction of the support pressing member, so that the supporting member presses against the inner peripheral surface of the processed material at a desired position on the outlet side where the processed material is released from the pressed state. A two-roll forming machine that bends a material with a large springback into an arc shape.