JPH087942Y2 - Cylindrical forming roll device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-roll cylindrical forming roll device, and more particularly to a cylindrical forming roll device having an improved finish of a joint portion of a formed cylinder.

[0002]

2. Description of the Related Art A plastic plate material such as a metal plate (hereinafter,
As a device for bending a "workpiece" into a cylindrical shape, an elastic roll and a hard roll, which rotate in opposition to each other, are provided in pressure contact with each other, and the work is inserted between both rolls to bend into a cylindrical shape. A forming roll device for forming a roll is known as a so-called two-roll device (for example, Japanese Patent Publication No.
No. -13974, Japanese Utility Model Publication No. 43-11238, etc.).

[0003]

However, the above-mentioned prior art device has the following problems.

First, in the above-mentioned apparatus, the diameter of the cylinder to be molded is determined by the outer diameter of the hard roll, but in actual work there may be slight variations in plate thickness and hardness among individuals. In this case, there is a possibility that the outer diameter is smaller than the desired diameter, and the front end of the work overlaps with the rear end of the work.

In the above case, in order to prevent this, there has been known a device in which a support bar for expanding a molded work to a desired diameter is arranged above a hard roll to forcibly prevent overlapping of the seams of the work. But (for example, 5
7-44629 gazette), in this case, a spatial allowance for arranging the support bar on the hard roll is required, and when molding a small-diameter cylinder, this allowance is not available and it cannot be performed.

Secondly, in the above apparatus, since the hard roll inevitably has a small diameter in the case of molding a cylinder having a small diameter, the hard roll is bent due to the pressure contact force with the elastic roll. Distortion occurs near the rear end of the work,
Due to the distortion, the vicinity of the rear end may not be bent and may remain as a straight portion.

[0007]

SUMMARY OF THE INVENTION The present invention is intended to provide a cylindrical forming roll device which solves the problems of the prior art as described above.
At the time when the rear end 1b of the work 1 passes between the elastic roll 3 and the hard roll 2, it is reversed without releasing the pressure contact between both rolls, and the front end 1a and the rear end 1b of the plate-shaped material are again placed between both rolls. It is characterized by allowing it to pass.

[0008]

Therefore, according to the present invention, even if the front end 1a and the rear end 1b of the work 1 are formed to overlap each other in the forward rotation stage as shown in FIGS. 1 to 3, they are shown in FIGS. 4 to 7. As described above, when the front and rear ends pass between the elastic roll 3 and the hard roll 2 in the reverse rotation stage, an action of eliminating the overlap therebetween is produced. The details of this operation will be described below.

First, when the reverse rotation of both rolls is started, the rear end 1b of the work overlaps with the front end 1a, and a step is formed on the outer circumference of the cylinder (state of FIG. 3). Therefore, when the reverse rotation is continued as it is, the end surface of the rear end 1b of the work projecting as a step from the outer periphery of the cylinder comes into contact with the surface of the elastic roll 3 (state in FIG. 4). Then, when the reverse rotation is further advanced, the front end 1a of the work is sent in the reverse rotation direction, but the rear end 1b is stopped in the direction of enlarging the outer diameter of the cylinder due to the reverse rotation (state of FIG. 5), and the step is eliminated. The passage between the two rolls is permitted only at the time, that is, when the overlap with the front end 1a disappears (state of FIG. 6). After that, since the front end 1a and the rear end 1b of the work pass between both rolls by reversing with the overlapping being eliminated, the cylinder is remolded in that state,
As a result, an accurate cylinder without overlapping seams can be obtained (state of FIG. 7).

Next, according to the present invention, even if the deformation of the hard roll causes distortion near the rear end of the work temporarily formed in the forward rotation stage and remains as a linear portion, the linear portion has a desired curvature in the reverse rotation stage. It causes the action of being bent again.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 8 is a partially cutaway side view of the cylindrical forming roll device of the present invention, and FIGS. 1 to 7 are enlarged views of the main part showing a series of operation steps of the same.

The hard roll 2 is made of metal, and the elastic roll 3 is used.
Are made of urethane, respectively, and the elastic roll 3 is axially fixed to the base P so as to be positioned below, the hard roll 2 bites into the surface of the elastic roll 3, and an arc-shaped recess formed on the outer periphery of the elastic roll 3 by the biting. Between the elastic rolls 3 so that the work 1 to be inserted and passed through can be bent and molded into a cylindrical shape (the reduction mechanism is not shown), and both rolls can be rotated so as to face each other. It is connected to a power mechanism (not shown).

In the forming roll device, when the rear end 1b of the work 1 passes between the elastic roll 3 and the hard roll 2, both rolls are reversed and the front end 1a and the rear end 1b of the work are again interposed between the rolls. A control mechanism is provided to control the power mechanism so as to pass through (the control mechanism is not specifically shown).

In this embodiment, as a control means, the time until the trailing edge 1b passes between the two rolls after the work 1 is inserted between the two rolls is set to the normal operation time of the two rolls. It employs a timer in which the time required for the front end 1a and the rear end 1b to move backward and finish passing between both rolls is set to the reverse operation time of both rolls.

In this case, it goes without saying that the operation may be controlled by other control means, for example, a sensor that detects the passage of the front ends 1a and 1b of the work 1.

[0016]

According to the present invention configured as described above, even if the seams of the molded cylinders overlap due to slight variations in the plate thickness and hardness of the workpieces, this overlap eliminates this overlap. Therefore, an accurate cylinder can always be obtained, and the linear portion that occurs at the rear end of the work due to the bending of the hard roll can also be eliminated by reversing, so an accurate cylinder can always be obtained, especially when molding a small diameter cylinder. Produce an effect.

On the other hand, even if a hard roll having an outer diameter slightly smaller than the set value is used in forming a desired cylinder, the diameter of the formed cylinder will naturally be small in the normal case. For example, the overlapping of works at the seam is forcibly eliminated, and the diameter of the cylinder is corrected according to the total length of the work. Therefore, if the diameter is within a certain range, one kind of hard roll can be used to form cylinders with different diameters. There is also an effect that it can be covered.

[Brief description of drawings]

FIG. 1 is a side view of an essential part showing an operating condition of a cylindrical molding device of the present invention.

FIG. 2 is a side view of an essential part showing an operating condition of the cylindrical molding apparatus of the present invention.

FIG. 3 is a side view of an essential part showing an operating condition of the cylindrical molding apparatus of the present invention.

FIG. 4 is a side view of a main part showing an operating condition of the cylindrical molding apparatus of the present invention.

FIG. 5 is a side view of an essential part showing an operating condition of the cylindrical molding apparatus of the present invention.

FIG. 6 is a side view of a main part showing an operating condition of the cylindrical molding apparatus of the present invention.

FIG. 7 is a side view of an essential part showing an operating condition of the cylindrical molding apparatus of the present invention.

FIG. 8 is a partially cutaway side view of the cylindrical molding device of the present invention.

[Explanation of symbols]

 1 Work (plate-shaped material) 1a Front end of work 1b Rear end of work 2 Hard roll 3 Elastic roll

Claims (1)

[Scope of utility model registration request] 1. A pressed to rotate in elastic roll and a hard roll and opposite the at molding roll device for bending molded into a cylindrical shape by inserting passes the plate material between the rolls, plate material Between the elastic roll and the hard roll.
Time until the trailing end of the roll passes between both rolls
Is set to the normal operation time of both rolls and
Until the front and rear edges of the plate-shaped material finish passing between both rolls,
A timer that sets the time at the reverse rotation time of both rolls
The cylindrical forming roll device is characterized in that the operation is controlled by .