JPS60145223A - Method and device for roll bending - Google Patents

Abstract

PURPOSE:To prevent a cylindrical material from deforming into a convex-barrel shape in working a small-diameter cylindrical body by preventing also the deformation of an upper roll and working the material by separating it into each semicircular part in working a sheet material into a cylindrical shape by press-holding it between rotating upper and lower rolls. CONSTITUTION:A sheet material B is bent by press-holding it between an upper roll 1 and a lower roll 2 of urethane roll whose central part is supported by auxiliary rolls 4, 4. Here, the material B is worked while pressing downward the central part of roll 1 by the lower surface of a supporting plate 14, which is provided to the lower ends of supporting rods 13 extending downward from a supporting beam 11 which is installed above the roll 1 and is connected to a machine body. After working first a semicircular part of product by rotating the roll 1 in one direction, the working is once stopped and a contacting force between the rolls 1, 2 is reduced or released to move the unworked end of sheet material B to the position between both rolls 1, 2 as shown by the figure. Next, the roll 1 is reversely rotated after press-holding the material B between both rolls 1, 2 to work the other semicircular part. Thus, the material B is worked without being disturbed by the sheet 14 because the working is separately performed in such a manner.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to roll bending of steel sheets, in particular to small diameter roll bending.

After roll bending, the bending process rotates at a fixed position.
This is done by sandwiching a plate material between two rolls and a rotatable lower roll that contacts the upper roll.

This lower roll is brought into contact with or close to the upper roll by an elevating device, and the processing curvature can be adjusted depending on the degree of contact with or proximity to the upper roll.

Conventionally, for the lower roll (2), a pair of small diameter steel rolls (2+1, (2+1) as shown in Fig. 5 are used, or
Alternatively, as shown in FIG. 6, a Fretan roll provided with a Frethane outer layer (2) is used. When machining small diameters, that is, machining with large curvature, these lower rolls
The upper roll is pressed vigorously through the upper roll, but this pressure causes the lower roll to bulge downward at the center as shown in Figure 7, and the processed chicken product also bulges at the center (large diameter) becomes barrel-shaped.

In order to prevent such inconvenience, the center of the lower roll is supported from below by a separate support means (Utility Model No. 5).
No. 8-185322 has already been proposed. (See FIG. 8) According to this, the above-mentioned deformation of the lower roll (2) can be prevented, and the above-mentioned defects in processing the small diameter cylinder can be prevented.

However, even with this conventional method, when manufacturing a cylinder with a smaller diameter (with a diameter of about 5 times or less than the diameter of the two rolls), a barrel-shaped product with a center door is used.

Although deformation of the lower roll (2) during processing can be prevented, the upper roll (1) is deformed so as to be bent upward at the center due to excessive pressure.

The object of the present invention is to prevent the two rolls from being deformed in order to prevent bending defects during processing of the small-diameter cylindrical body.

The first technical means of the invention for solving the above problem is to advance the bending process while pressing the upper roll downward at its center, and to rotate the upper roll in one direction to form the product. Processing one semicircular part and temporarily interrupting the bending process, then weakening or releasing the pressure contact between the upper roll and the lower roll and moving the unprocessed end of the plate material to be located between the two rolls, Thereafter, the upper roll and the lower roll are pressed together with a predetermined strength, and the upper roll is reversed to process the other semicircular portion.

The above technical means of the first invention operates as follows.

Because the upper roll is pressed downward at its center,
The upper roll is not deformed in the central portion even by the pressing force between the two rolls during bending. Further, since the semicircular portion of the product shape is processed separately, the support means for pressing the upper roll downward does not interfere with the processing.

This first shot F! Since AFi has the above configuration, it has a unique first-order effect.

(1) Since deformation of the upper door can be prevented, the finished curvature of the product can be further increased. That is, even if a cylindrical body with an extremely small diameter is manufactured, a bending defect will not occur in the central portion.

(2) Deformation of the upper roll can also be prevented by increasing the diameter of the upper roll to increase its rigidity, but in this case, due to constraints due to the curvature of the outer peripheral surface of the upper roll, it is difficult to Although the small diameter cannot be made very small, according to the first invention, the diameter of the upper roll does not become large, and the diameter of the workable product can be further reduced.

Next, the technical means of the second invention includes a support bar disposed above the upper roll and connected to the fuselage, a support bar extending downward from the support bar, and a support bar extending downward from the support bar, and a support bar extending downward from the support bar. A supporting plate is provided and the lower surface of the upper roll is slidably in contact with the curved surface of the upper roll.

The above technical means of the second invention operates as follows.

According to this technical means, if the pressure contact force of the lower roll is adjusted to be stronger or weaker at the same timing as in the first invention mentioned above, and at the same time the upper roll is rotated forward and reverse at the same timing, it is possible to produce a cylindrical product. During this bending process, the upper roll is pressed downward by the machine body via the support plate, support rod, and support crosspiece, so deformation of the upper roll from bending upward at the center part is prevented, and the first The same effect as the second invention can be achieved.

Since this second emitter 8A has the above configuration, it has the following unique effects.

” Since only the supporting plate is in direct contact with the roll 2,
The radial dimension of the contact portion with the upper roll is small, and when bending a small diameter, the processed tip of the plate comes into contact with this contact portion, which may cause problems.

Therefore, it is possible to eliminate the inconvenience of not being able to reduce the tensioning radius due to the means for pressing the upper roll being an obstacle.

Hereinafter, embodiments of the second invention will be described in detail, and the first invention will also be specifically explained.

The roll bending machine U of Jin's embodiment uses a Fretan roll for the lower roll (2), and the lower end of the upper roll (1) partially bites into the Frethane layer, and the case shown in Fig. 6 is used. The bending process proceeds in the same manner. In addition, in order to prevent the lower rail from bending during this bending process, a pair of auxiliary rolls +4+ and +41 are moved up and down integrally with the lower roll support device.
is provided.

This auxiliary role! 4+ and +41 are supported by support devices similar to those provided at both ends of the lower roll (2), and these support devices are supported by a crank 6 provided on the drive shaft (5).
1), a link (6) connected to this, and a pair of sliders +31', which are connected to this link and run vertically by the machine body (A), and an auxiliary roll, etc. is pivotally supported on this slider. has been done. (See Figure 1.2) Therefore, depending on the rotation of the drive shaft (5), the lower roll (2) and the auxiliary roll +41, ! 41 are raised and lowered integrally.

The pressing and releasing of the upper roll (1) is controlled by the rotation of this drive shaft (5). The timing and opening degree of this pressure contact/release can be set in advance by an auxiliary pulse motor (8)K that rotationally drives the drive shaft (5).

Crank (511 (r) Rotate the lower roll (2
) is brought into pressure contact with the upper roll (1), and when the machining of one internal part is completed, the lower roll (2) is pulled down by a predetermined amount to weaken the degree of pressure contact of the lower roll (2), that is, the intermediate feed state (third Furthermore, the lower roll (2) is made to be in a completely open state when the processing of the other internal part is completed.

1. To adjust the curvature of the bending process, use the lower roll (2).
For this purpose, in this embodiment, the three links +61, +61, +6)'e are expanded and contracted in synchronization. As this expansion and contraction mechanism,
Each link (6) is composed of a main link (621) and a sub-link (61) that is screwed into the main link, and a form gear device (7) consisting of a combination of this form and a form wheel L is installed between these two links. These form gear devices M+71' are interposed and provided on each link.
[71.

The form (7) is configured to rotate around one axis ff11.

Next, a pair of arms Q2, +12 are made to protrude above the fuselage prisoner from both ends of the support bar (+11).
A pair of support rods (13), 03) are installed between the upper ends, and are suspended downward from the middle of the support rod f13.
1, +131, the support plate 041 is attached to the lower end of the upper roll (1
).

In the cross section of this support plate 04), its lower surface is the upper roll (1).
It has a curved surface that circumscribes the outer periphery of the cross section, and the upper surface is formed into a substantially circular arc shape and has a thinner wall at both ends of the cross section.

On the other hand, the 10-rule (1) is driven to rotate by the main pulse motor (9), and its rotation angle is controlled by a control device, and each process proceeds according to the procedure shown in Figure 3 according to the product diameter. do.

This control device is constructed as shown in Fig. 4, and the output from the diameter setting device [+01] for setting the bending diameter is
The forward rotation angle setting device Cl0I that sets the forward rotation angle of the main pulse dryer (9), the reverse rotation angle setting device 2# (support) that sets the reverse rotation angle, and the flang of the lower roll (2). input into a computing device @spit equipped with a flanging device (40) for setting timing and flanging degree;
The output from this arithmetic unit is input to the main pulse motor (9+) and the sub-pulse motor (8).

Therefore, if the bending diameter is arbitrarily set in advance, the timing of the pressure contact, release, and intermediate feed state of the lower roll (2) and the degree of crank rotation at that time are set to predetermined values by the performance equipment mark. Output is auxiliary pulse motor (8)
is input to the sub-pulse motor according to these setting values.
rotates at a predetermined angle and at a predetermined timing.

In addition, this 01 work corresponds to the main pulse motor (9), and the forward rotation amount during machining of the internal part, the forward rotation amount during the above-mentioned intermediate feed, and the timing of these forward rotations corresponds to the above-mentioned flang timing. The forward rotation angle setting device ■ is set by the forward rotation angle setting device ■ and inputted to the main pulse motor (9) K, and the reverse rotation amount and timing for the primary half-circle machining are set by the reverse rotation angle setting device ■ and the main pulse is input in the same way. It is input to the motor (9).

Therefore, in the case of this embodiment, the series of steps shown in FIG. In this case, the flanged state is never released, and the relationship between the plate material (B) and each roll changes frequently while remaining initially set.

Therefore, there is no misalignment between one internal part processed in the previous process and the other internal part processed in the subsequent process, and there is no inconvenience such as twisting in the finished product.

In this example, processing and intermediate feeding of each internal part were performed according to the output of the computing device group according to the preset machining diameter, but the plate material (B
) or the center position of the plate material (B) is provided, and the output of this detection device is used to pressure the main pulse motor (9) and the sub-pulse motor (8) to be fully controlled. good.

[Brief explanation of drawings]

Figure 1 is a detailed explanatory diagram of the second invention, Figure 2 is
3 is an explanatory diagram of the processing process according to this embodiment, FIG. 4 is a block diagram of the control device of this embodiment, FIGS. 5 and 6 are explanatory diagrams of roll bending, and FIG. Fig. 8 is an explanatory diagram showing the state of each roll during processing of a small diameter cylinder, and is an explanatory diagram of a conventional example. 3)...Slider (4)...
・Auxiliary roll 111...Support crosspiece 02+...
...Arm Q3...Support rod (14)...
・Support plate (B)・・・・・・Plate agent Yoshihiro Sakaue, patent attorney

Claims (2)

[Claims] (1) In a roll bending method in which a cylindrical product is formed by pressing a plate material between an upper roll and a lower roll rotating at 0, the bending process is performed while pressing the upper roll downward at its center. The upper roll is rotated in one direction to process one inner part of the product, the bending process is temporarily interrupted, and then the pressure contact between the upper roll and the lower roll is weakened or released so that the unprocessed end of the plate material is A roll bending method in which the rolls are moved to be positioned between the rolls, then the upper roll and the lower roll are pressed with a predetermined force, and the rolls are reversed to process the other internal part. (2) A roll bending device that processes a cylindrical product by compressing a plate material with an upper roll and a lower roller that rotates at 0 rotations has 7 layers.
A support bar on which a 1-force f1 straddle is provided, a support bar that extends downward from this support bar, and a support bar that is provided at the lower end of this support bar and whose lower surface is the curved surface of the upper roll. and a support plate slidably in contact with the roll bending device.