JP3010168B2 - Arm mechanism for high frequency vendor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an arm mechanism for a high frequency bender used in a high frequency bender for bending a metal material having various cross-sectional shapes by induction heating with a high frequency heating coil.

[0002]

2. Description of the Related Art Generally, as a conventional high frequency vendor,
For example, a "tube bending method" disclosed in JP-A-61-17329 and a "heating-type bending apparatus" disclosed in JP-B-51-14047 are known as conventional examples. In the above-described known example, a feed screw is provided in an arm having a rotation center at a position different from the bending center of the pipe, and a slide table that slides in the axial direction of the arm by the feed screw is provided. A rotation support base having a clamp portion is provided on the slide base, and a brake device for applying a brake force to the arm is provided.The brake force, the bending moment, and the bending force reduce the pressing force by three forces. That is, it is controlled to be constant. Further, in the above-mentioned known example, a workpiece holding device having a heating coil and a bending roll, a rotatable arm having the workpiece holding device movably mounted in the axial direction, and an arc-shaped arm And a driving device that rotates along the rail, and processes the workpiece into an arbitrary shape by moving the workpiece holding device.

[0003]

In the above-mentioned known example, the length of the arm cannot be adjusted because the rotation axis of the arm is at a fixed position. Is provided. With such a configuration, the distance between the heater and the rotating shaft is always constant. For example, if the distance is 4 m at the maximum, the radius of curvature due to the rotation of the arm is always 4 m. When a bend having a radius of curvature of 1 m is required, a radius of curvature of 1 m cannot be produced by rotation of the arm itself. Therefore, in order to obtain a radius of curvature of 1 m, it is necessary to rotate the rotary support and to move the slide so that the radius of curvature becomes 1 m while restricting the rotation angle of the arm, which is extremely troublesome. Operation and work are required.

Also, in the above-mentioned known example, similarly to the above-described known example, the length of the arm cannot be adjusted because the rotation axis of the arm is fixed, and a heating coil and a bending roll are used instead. And a workpiece holding device having the following configuration. The workpiece is in a clamped state in which it is not sent out, and the end to be processed is protruded by a predetermined length, and the workpiece holding device moves while bending the fixed workpiece. In this case, the arm is rotated along an arc-shaped rail. However, even in such a configuration, the length of the arm is limited, and since the rotation axis is fixed, the length of the workpiece and the curvature of the bending process are limited. There is no problem when processing, but when processing a long workpiece or bending into an elliptical or spiral shape with a changing curvature, the changed part (connection part) of the bending is processed beautifully There is a problem that it cannot be performed.

Therefore, in the prior art, an arm mechanism for a high-frequency bender which eliminates troublesome operations and operations, and which can finish finely even in an elliptical or spiral bending process with a changing curvature is developed. There is a problem in particular.

[0006]

SUMMARY OF THE INVENTION As a specific means for solving the above-mentioned problems, the present invention has a workpiece feeding mechanism and a heating coil provided adjacent to the feeding mechanism. A high-frequency bender arm mechanism used for a high-frequency bender that bends while feeding and heating while heating with a high frequency of a heating coil, comprising: a rotation shaft position setting means in the bender arm; and a bender arm on the rotation shaft. An arm holder for attachment, and a bender arm attached to the arm holder so that the effective length can be freely adjusted, wherein the position setting means is provided in a direction orthogonal to a feeding direction of the workpiece and to match the position passing through the center of the heating coil disposed, the arm holder, between the axis of the vendor arm from the axis of the rotating shaft in a predetermined horizontal A grip portion for gripping the workpiece at the tip of the bender arm, wherein the grip portion is configured to be rotatable by a predetermined angle with respect to the axis of the bender arm. An object of the present invention is to provide an arm mechanism for a high frequency bender.

Further, in the present invention, the position setting means is a screw screw and rails provided on both sides thereof, the distance between the heating coil and the rotating shaft can be set arbitrarily, and the tip of the bender arm The grip portion provided in the above-mentioned section includes an additional requirement that it is a manual, hydraulic, or power type chuck mechanism.

According to the arm mechanism for a high-frequency bender according to the present invention, the rotation axis of the bender arm can be set at an arbitrary interval between the bender arm and the heating coil, so that any change in curvature can be appropriately dealt with. Accordingly, the length of the arm can be arbitrarily changed to an appropriate length, whereby the connecting portion where the curvature changes can be neatly formed with a simple configuration.

[0009]

An embodiment of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, a high frequency bender arm mechanism 1 of the present invention generally includes a bender arm 2, a rotating shaft 3 for rotatably supporting the bender arm 2, and a rotating shaft 3 at an arbitrary set position. It has a position setting means 4 for fixing, and a gripper 5 which grips a workpiece to be processed, which is disposed at the tip of the bender arm 2.

As shown in FIG. 1, the rotating shaft 3 is perpendicular to the feeding direction of the workpiece and the center of the heating coil 17.
And adjacent to the heating coil 17
It is arranged so as to be movable in the direction of the arrow AB by the position setting means 4 arranged in the state in which it is set. That is, the position setting means 4
Is composed of a screw screw 14 and two rails 28, 28 provided on both sides thereof.
4 is connected to a drive motor 16 via a speed reducer 15. The rotating shaft 3 is engaged with the screw 14 via the base member 11. By operating the drive motor 16, the base member 11 slides on the rails 28 by the rotation of the screw 14. The rotating shaft 3 can be moved to an arbitrary position and maintained in a fixed state, whereby the distance or interval between the rotating shaft 3 and the heating coil 17 can be freely adjusted.

An arm holder 18 is provided integrally with the rotating shaft 3. As is clear from the drawing, the arm holder 18 has a box shape as a whole, and the bender arm 2 is attached in a penetrating state.
In contrast, the effective length of the bender arm 2, that is, the turning length, can be freely adjusted, and after the adjustment is made, the arm is fixed with a plurality of bolts 30. Arm holder 1 in this case
8 is provided at a predetermined distance from the axis of the rotating shaft 3, and the axis of the bender arm 2 fixed to the arm holder 18 is horizontally shifted from the axis of the rotating shaft 3. At predetermined intervals. This predetermined interval is such that the vender arm 2 is positioned parallel to the position setting means 4 and the distance at which the position interval not affected by the heating coil 17 can be maintained when the workpiece is gripped by the gripping portion 5 at the tip thereof. The interval.

The gripper 5 includes a fixed table 19 fixed to the tip of the bender arm 2, and a rotating table 2 rotatably supported by the fixed table 19 with pins 20.
And 1. The fixed table 19 has a horizontal upper surface, and is formed so that the rotary table 21 can rotate freely.

The rotary table 21 has a locking projection 22 formed on the pin 20 side and a locking projection 23 formed on the opposite side at a predetermined interval. A chuck mechanism 24 is provided inside the locking projection 23.
The chuck mechanism 24 clamps the workpiece between the locking projection 22 and a manual jack, for example. The manual chuck mechanism may be, for example, a so-called dalma jack or the like combining gears. The chuck mechanism 24 may use a hydraulic jack of a type in which hydraulic pressure is introduced by a manual pump. When a hydraulic jack is used, the workpiece can be held with a stronger force. Further, the chuck mechanism 24 may be a power type chuck mechanism including a drive motor, a speed reduction mechanism, a screw, and the like. In the case of the power type, a stronger gripping force can be obtained in a short time.

The heating coil 17 is connected to a high frequency power supply via a transformer 25,
A high frequency of ９００900 KW can be arbitrarily supplied. When the metal to be processed is inserted into the magnetic field of the heating coil 17 connected to the high frequency power supply, induction heating is performed by electromagnetic induction. This induction heating actively utilizes the heat loss of magnetic hysteresis,
In addition, it uses the skin effect and proximity effect of the medium frequency skillfully.

The high frequency bender is a mechanism for feeding a workpiece 29 such as an H steel material, that is, transport rollers 26,
The conveyor 27 includes a conveyor 27, and the workpiece 27 can be sequentially sent out to the processing position, that is, the position of the heating coil 17 arranged in an adjacent state. This feeding speed can be arbitrarily set depending on the workpiece.

Next, the operation of the high-frequency bender arm mechanism configured as described above will be described. First, as shown in FIG. 4, when bending is performed with a curvature having a radius of, for example, 1 m using the arm mechanism for a high frequency bender, the screw 14 of the position setting means 4 is driven to move the rotating shaft 3. Then, the distance from the core of the heating coil 17 is set to 1 m, and the bender arm 2 is set and fixed so as to be parallel to the screw 14 of the position setting means 4. By setting in this manner, the vendor arm 2
Is also substantially 1 m. Then, the chuck mechanism 24 of the gripper 5 is operated to hold the tip of the workpiece 29 protruding through the heating coil 17. In this state, high frequency is supplied from the transformer 25 to the heating coil 17 for heating, and the conveyor 27 is driven to sequentially send out the workpiece 29 forward. At this time, the curvature radius I = 1
m, the rotation angle θ of the vendor arm 2 is 2π ×
θ ÷ 360 = 1 and θ = 57.32 · °.

Further, when the workpiece 29 is bent at the radius of curvature I = 2 m, the chuck mechanism 24 of the gripper 5 is loosened and the arm holder 18 is also loosened. The position is moved to a position 2 m from the core of the heating coil 17. In addition, the bender arm 2 is returned to the original position, that is, a position parallel to the screw 14, and at that position, the gripper 5 is rotated in accordance with the curvature of the workpiece 29 as shown in FIG. Is held at an angle α with respect to the axis of the bender arm 2. Conventionally, when changing the radius of curvature, only the radius is changed without changing the angle of the grip portion. But,
In this case, the portion where the curvature was changed could not be processed properly.
Therefore, in the present invention, the turntable 21 is tilted in accordance with the curvature of the already bent portion to smoothly bend the portion where the curvature changes. In this way, the position of the rotating shaft 3 supporting the bender arm 2 is
7 to 2 m, the gripping portion 5 of the bender arm 2 is tilted and gripped according to the curvature of the workpiece 29, and then the heating coil 17 is brought into a heating state, and the conveyor 2 serving as a feeding mechanism is set.
7, the workpiece 29 is sent out.

At this time, as shown in FIG.
= 2 m, the rotation angle θ of the vendor arm 2 is 4
π × θ ÷ 360 = 2, θ = 180 / π = 57.32 · °
Becomes FIG. 6 shows, in order, a radius of curvature l = 3 m and a radius of curvature l
It is explanatory drawing at the time of bending each to 4m. When the bending is performed as described above, since the axis of the bender arm 2 and the axis of the rotating shaft 3 are displaced from each other by a predetermined distance in the horizontal direction, it is necessary to smoothly bend the portion where the radius of curvature is changed. Can be done.

In the case of bending into an S-shape, a member which has already been bent is placed on the conveyor 27 in the opposite direction, and then gripped by the grip portion 5 and bent. Also in this case, since the turntable 21 rotates, a clean S-shaped bending process can be performed.

Further, the shaft center of the rotary shaft 3 and the arm 2
Are displaced by a predetermined distance in the horizontal direction, so that the bending portion of the processing member 29 can be smoothly bent without a sharp start portion. That is, since the two centers are provided at positions separated from each other, the initial feeding is slightly straight, but the bending work in the vicinity of the gripping margin of the workpiece can be smoothly performed.

In the above embodiment, the case where the rotary shaft 3 is moved by the screw 14 of the position setting means 4 has been described, but the rotary shaft 3 is moved by a roll chain winding mechanism or a wire rope. May be.
The present invention is not limited to the above embodiments, and various design changes can be made based on the technical idea of the present invention.

[0022]

As described above in detail, the arm mechanism for a high-frequency bender according to the present invention has a feed-out mechanism for a workpiece and a heating coil provided adjacent to the feed-out mechanism. A high-frequency bender arm mechanism used for a high-frequency bender that bends a part of the material while feeding it while being heated by a high frequency of a heating coil, comprising: a rotary shaft position setting means in the bender arm; An arm holder for attaching an arm, and a vender arm attached to the arm holder so that the effective length can be freely adjusted, the position setting means includes:
The arm holder is disposed in a direction perpendicular to the feeding direction of the workpiece and coincident with a position passing through the center of the heating coil. The gripper is configured to be shifted by a predetermined distance, and a grip for gripping the workpiece is provided at the tip of the bender arm, and the gripper is configured to be able to rotate by a predetermined angle with respect to the axis of the bender arm. The axis of rotation of the vendor arm can be easily, simply and accurately moved in accordance with the radius of curvature of the bending process, and can be adapted to bending with any radius of curvature without requiring complicated operations. In addition, it is possible to smoothly change the curvature even when the bending process is performed by sequentially changing the radius of curvature. Therefore, there is an excellent effect that smooth elliptical processing and spiral processing can be easily formed.

The bender arm is attached to an arm holder provided on the rotating shaft so that the effective length thereof can be freely adjusted, and the axis of the bender arm and the axis of the rotating shaft are adjusted. Are shifted by a predetermined distance in the horizontal direction, so that the starting portion of the circular arc can be smoothed regardless of the bending process of any curvature radius. Furthermore, since a chuck mechanism is provided at a grip portion disposed at the tip of the bender arm, a gripping operation of a workpiece can be performed quickly and stably, and an excellent effect that workability is facilitated. To play.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a high-frequency bender arm mechanism of the present invention.

FIG. 2 is a side view showing a distal end portion of a bender arm in the high-frequency bender arm mechanism of the present invention.

FIG. 3 is a plan view showing a gripping state of a workpiece after bending at a tip end of the bender arm.

FIG. 4 is an explanatory diagram of a case where bending is performed with a curvature having a radius of curvature of 1 m using the arm mechanism for a high-frequency vendor.

FIG. 5 is an explanatory diagram in the case of performing bending with a radius of curvature of 2 m following to bending with a radius of curvature of 1 m using the high-frequency bender arm mechanism.

FIG. 6 is an explanatory view showing a case where elliptical bending is performed using the arm mechanism for a high-frequency vendor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High-frequency bender arm mechanism 2 Vendor arm 3 Rotating shaft 4 Position setting means 5 Gripping part 11 Base member 14 Screw screw 15 Reducer 16 Drive motor 17 Heating coil 18 Arm holder 19 Fixed table 20 Pin 21 Rotary table 22, 23 Stop projection 24 Chuck mechanism 25 Transformer 26 Transport roller 27 Conveyor 28 Rail 29 Workpiece 30 Bolt

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B21D 7/024 B21D 7/16

Claims (3)

(57) [Claims] 1. A high-frequency bender having a workpiece feeding mechanism and a heating coil provided adjacent to the feeding mechanism, and bending a part of the workpiece while feeding it while heating it with the high frequency of the heating coil. The arm mechanism for a high-frequency bender used in (1), a means for setting the position of the rotating shaft in the bender arm, an arm holder for attaching the bender arm to the rotating shaft, and the arm holder having an effective length freely. The position setting means is provided in a direction orthogonal to the feeding direction of the workpiece and the center of the heating coil.
The arm holder is arranged so that the axis of the bender arm is shifted from the axis of the rotating shaft by a predetermined distance in the horizontal direction, and the end of the arm of the bender is processed. An arm mechanism for a high frequency bender, characterized in that a grip portion for gripping the material is provided, and the grip portion is configured to be able to rotate by a predetermined angle with respect to the axis of the bender arm. 2. The arm mechanism for a high frequency bender according to claim 1, wherein the position setting means is a screw screw and rails provided on both sides thereof, and the distance between the heating coil and the rotating shaft can be arbitrarily set. 3. The arm mechanism for a high-frequency bender according to claim 1, wherein the grip portion provided at a tip of the vendor arm is a manual, hydraulic, or power type chuck mechanism.