JPH0818078B2 - Conical bending method and device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conical bending method and apparatus for bending a flat plate into a conical shape using three parallel rolls.

[0002]

2. Description of the Related Art In a conventional conical bending method using three rolls, an upper roll is provided above the middle of two lower rolls so as to be inclined with respect to the axial direction of the lower rolls, and a flat plate is placed between the upper and lower rolls. The flat plate is bent into a conical shape by rotating the rolls into the conical shape. Apart from this, FIG.
As shown in FIG. 2, there is known a conical bending method / apparatus in which a processed plate material 20 is placed on a concave portion of a receiving jig 21 and is pressed by a pressing jig 22 to form a conical shape.

[0003]

In the conventional conical bending method / apparatus using three rolls having an inclined upper roll, it is difficult to calculate the radius of the circle, and the work depends on the experience and feeling of a skilled person. . In addition, misalignment is likely to occur in bent products,
Butt joining becomes difficult. Further, there is a problem in that a bending roll capable of bending a large diameter and a large thickness becomes extremely expensive and the processing cost becomes high. or,
In the conical bending method by pressing, the Makin wire 23 as shown in FIG.
It is necessary to fill in (line showing the pressurizing position).
In addition, it takes time to select the receiving jig 21 and the pressing jig 22 depending on the bending size, and only the bending process of 270 degrees can be performed, which is a work based on the experience and feeling of a skilled worker as described above. The problem to be solved by the present invention is to solve the conventional problems, and to perform conical bending easily and accurately without the need for skill.
Moreover, it is an object of the present invention to provide a conical bending method and device that can be processed at low cost.

[0004]

Means for Solving the Problems The gist of the present invention which has solved the above problems is as follows: 1) A lower roll between lower rolls of three parallel rolls consisting of two lower rolls and one upper roll which are parallel to each other. An auxiliary rotating pin is provided in a direction orthogonal to the axial direction of the fan-shaped flat plate, which is cut into the expanded shape of the conical bending product to be processed, is inserted between the upper and lower rolls so that the inner peripheral edge of the fan-shaped flat plate is in contact with the auxiliary rotating pin. Then rotate the three parallel rollers and simultaneously assist
Also rotate the rotating pin to move the inner peripheral edge of the flat plate to the auxiliary rotating pin.
The outer peripheral edge of the auxiliary rotating pin is brought into contact with the outer periphery and the inner peripheral edge of the flat plate
Restricted to send at peripheral speed, and auxiliary pin
The rotation speed of the
Depending on the processing time of the outer peripheral edge of the plate and the peripheral speed of the auxiliary rotary pin
The processing time of the inner peripheral edge of the flat plate sent will be almost the same.
The conical bending method is characterized in that the flat plate is bent into a conical shape by setting so that 2) between the lower rolls of three parallel rolls consisting of two lower rolls and one upper roll that are parallel to each other. Is equipped with an auxiliary rotation pin in the direction orthogonal to the axial direction of the lower roll, and the auxiliary rotation pin is
The rotation speed of the roller is sent at the roller feed speed of the upper and lower rollers.
The processing time of the outer edge of the flat plate and the flat plate sent by the auxiliary pin
The conical bending apparatus is provided with a drive means with a rotation speed adjuster for the auxiliary rotation pin that is set so that the processing time of the inner peripheral edge is substantially the same .

[0005]

In the present invention, the flat plate before bending is preliminarily cut into a fan shape in the expanded state of the conical bent product. This fan-shaped flat plate is inserted between the upper and lower parallel rolls, and the tip of the inner peripheral edge of the flat plate (the portion that becomes the upper edge of the conical product) is brought into contact with the auxiliary rotation pin. In this state, while rotating the three parallel rolls, the auxiliary rotation pin is rotated at a slow feed speed. As a result, the outer peripheral edge of the flat plate having a long peripheral length is fed at the feed speed of the parallel roll driving roll (peripheral speed of the outer periphery of the roll), and the inner peripheral edge of the flat plate having a short peripheral length is fed slowly by the auxiliary rotary pin. Force to send at speed. By feeding in this way, the outer circumference and the inner circumference of the flat plates having different lengths are bent within the same time. As a result, the flat plate is processed into a conical shape.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a partially cutaway front view showing a bending apparatus for a conical bending method according to the present invention, FIG. 2 is a partially cutaway plan view of the bending apparatus, and FIG. 3 is a sectional view taken along line AA of FIG. 5 is an enlarged front view showing the rotating mechanism of the auxiliary rotating pin, FIG. 5 is an enlarged plan view showing the rotating mechanism, FIG. 6 is an enlarged vertical sectional view showing the rotating mechanism, and FIG. 7 is a bending apparatus of the present invention. FIG. 8 is an explanatory view showing a state at the time of starting bending of the embodiment of the working method using the method, FIG. 8 is an explanatory view showing an arrangement state of the auxiliary rotary pin, and FIG. 9 is an explanatory view showing an action of the auxiliary rotary pin of the present embodiment. FIG. 10 is a front view showing a conical bent product, and FIG. 11 is a plan view showing the shape of a flat plate to be processed.

In the figure, 1 and 2 are lower rolls, 3 is an upper roll,
4 is an auxiliary rotation pin, 5 is a fan-shaped flat plate to be processed, 6, 7
Is a roll bearing unit, 8 is a roll driving unit, 9 is a base, 10 is a guide projecting from the side surface of the auxiliary rotation pin, 11 is a casing having a recess for accommodating the guide and the auxiliary rotation pin 4 so as to be vertically movable, 12 Is a casing bearing, 13 is a spur gear provided around the casing 11, 14 is a worm gear meshed with the spur gear, 15 is a motor for rotating the worm gear,
Reference numeral 16 is a spring that biases the auxiliary rotation pin 4 upward so as to contact the lower surface of the upper roll 3, and 17 is a rotation speed adjuster that can set the motor 15 to a rotation speed of a required rotation speed n described below.

This embodiment is an example in which a frusto-conical bent product having a large lower side diameter R1 and a smaller upper side diameter R2 shown in FIG. 10 is processed. First, the frusto-conical bent product is cut into a developed shape. The fan-shaped flat plate 5 shown in FIG. 11 is prepared. Next, with the upper roll 3 raised, the flat plate 5 is moved to the position shown in FIG.
As shown in FIG. At this time, the tip of the inner peripheral edge of the flat plate 5 (upper side edge of the cone of diameter R2) is brought into contact with the auxiliary rotary pin 4. After that, the upper roll 3 is lowered, and while pressing the flat plate 5, it is rotated in the feeding direction of the flat plate 5 in FIG. At the same time, the auxiliary rotary pin 4 is rotated at a rotational speed at which the outer peripheral edge and the inner peripheral edge of the flat plate 5 can be processed in the same time. The rotation of the auxiliary rotation pin 4 is performed by operating the motor 15, rotating the worm gear 14, rotating the spur gear 13, and rotating the casing 11 to which the spur gear 13 is fixed. As a result, the auxiliary rotation pin 4 attached to the casing 11 so as to be vertically movable is rotated. On the other hand, the outer peripheral edge of the flat plate 5 is fed at the feed speed of the upper roll 3, and the inner peripheral edge is fed at the slow speed of the auxiliary rotary pin 4,
The outer peripheral edge and the inner peripheral edge having different lengths are processed in the same time. As a result, the flat plate 5 is bent into a conical shape.

The conditions for the rotational speed n of the auxiliary rotary pin 4 in this embodiment are as follows. Auxiliary rotating pin 4, outer diameters R1 and R2 of the upper and lower sides of the conical product, lengths LR1 and LR2 of the outer and inner peripheral edges of the flat plate, cone angles θ1, cone lengths L1 and L2, and rolls of the upper roll 3. The relational expression among the diameter Br, the diameter Pr of the auxiliary rotation pin, and the rotation speed N (number of rotations per minute) of the upper roll 3 is as follows. Feeding speed of outer peripheral edge by roll V0 = Br × 3.14 × N Outer peripheral side machining time T0 = LR1 / V0 Inner peripheral side machining time Ti = LR2 / Vi Rotation speed of auxiliary rotary pin n n = Vi / 3.14 × P
r Outer peripheral side machining time T0 = Inner peripheral side machining time Ti If the auxiliary rotary pin 4 is rotated at the rotation speed n calculated by this formula, the outer peripheral edge and the inner peripheral edge of the flat plate 5 can be processed at the same time and bent into a conical shape. The detailed movement of the auxiliary rotation pin 4 will be described with reference to FIG.

Point a is a state in which the material is set and immediately before the roll is rotated, and point b is a state in which the material is being fed. L1 =
l2, and a difference of δH occurs at the position of b, theoretically the auxiliary rotation pin 4 and the inner peripheral contact point do not move, but the pressing force generated by the outer peripheral feed causes the frictional force between the auxiliary rotation pin 4 and the material. It moves slightly when it exceeds the limit. The inner circumference moves shockingly while repeating the above movement. With respect to the above movement, abrasion on the inner peripheral side and friction on the inner peripheral side due to friction of the auxiliary rotary pin 4, and seizure depending on the material may be considered. Inner peripheral side and auxiliary rotation pin 4
By eliminating the friction, the movement is prevented from moving impulsively and the material and the auxiliary rotating pin 4 are not damaged. The rotation of the auxiliary rotation pin 4 needs to be the same as the outer peripheral processing time, and if the auxiliary rotation pin 4 freely rotates, it cannot be bent into a conical shape.

[0011]

As described above, according to the present invention, the conical bending can be easily performed by providing the auxiliary rotating pin and by adding the auxiliary rotating pin at a low required rotation speed with a simple additional structure and operation. Conical bending can be performed regardless of the experience and feeling of the expert. Further, the bending process can be performed with good reproducibility and accuracy, and the processing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a bending apparatus for a conical bending method according to the present invention.

FIG. 2 is a partially cutaway plan view of the bending apparatus.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is an enlarged front view showing a rotation mechanism of an auxiliary rotation pin.

FIG. 5 is an enlarged plan view showing the rotating mechanism.

FIG. 6 is an enlarged vertical sectional view showing the rotation mechanism.

FIG. 7 is an explanatory view showing a state at the time of starting bending of an example of a processing method using the bending apparatus of the present invention.

FIG. 8 is an explanatory diagram showing an arrangement state of auxiliary rotation pins.

FIG. 9 is an explanatory diagram showing the operation of the auxiliary rotation pin of the present embodiment.

FIG. 10 is a front view showing a conical bent product.

FIG. 11 is a plan view showing the shape of a flat plate to be processed.

FIG. 12 is an explanatory diagram showing a conical bending process by a conventional press process.

FIG. 13 is an explanatory diagram showing a Markin line of a pressed plate material.

[Explanation of symbols]

 1 Lower Roll 2 Lower Roll 3 Upper Roll 4 Auxiliary Rotating Pin 5 Flat Plate 6 Roll Bearing 7 Roll Bearing 8 Roll Drive 9 Base 10 Guide 11 Casing 12 Casing Bearing 13 Spur Gear 14 Worm Gear 15 Motor 16 Spring 17 Rotational Speed Regulator

Claims (2)

[Claims] 1. An auxiliary rotating pin is provided between the lower rolls of three parallel rolls consisting of two lower rolls and one upper roll which are parallel to each other in the direction orthogonal to the axial direction of the lower rolls for processing. Insert the fan-shaped flat plate cut into the developed shape of the conical bent product between the upper and lower rolls so that the inner peripheral edge of the flat plate is in contact with the auxiliary rotation pin, and then rotate the three parallel rollers ,
At the same time, the auxiliary rotation pin is also rotated to rotate the inner peripheral edge of the flat plate for auxiliary rotation.
Place the inner peripheral edge of the flat plate in contact with the outer circumference of the rolling pin
Restricted to send at the outer peripheral speed of the
The rotation speed of the rotary pin is sent at the roller feed speed of the upper and lower rollers.
Processing time of outer edge of flat plate and outer circumference of auxiliary rotary pin
The processing time of the inner peripheral edge of the flat plate sent at the peripheral speed is almost the same
The conical bending method is characterized in that the flat plate is bent into a conical shape by setting so that Wherein an auxiliary rotation pin in a direction perpendicular to the axial direction of the lower roll between three parallel rolls lower roll comprising a parallel two lower roll and roll over the single one another, the auxiliary
The rotation speed of the auxiliary rotation pin is the roller feed speed of the upper and lower rollers.
The processing time of the outer peripheral edge of the flat plate and the auxiliary pin
Set so that the processing time at the inner edge of the flat plate is almost the same.
A conical bending device, characterized in that it is provided with a drive means with a rotation speed adjuster for the auxiliary rotation pin to be fixed .