JPH0442065Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a fully automatic welding device having a preheating function.

(Prior Art) When welding high carbon steel containing 0.2% or more carbon, preheating is generally performed prior to welding in order to prevent cracking caused by thermal strain during welding.

The above preheating is performed exclusively in a preheating device provided separately from the welding device, and after the preheating is completed, the preheated article (also referred to as a workpiece) is placed in a predetermined position of the welding device and welding is performed. I was worried.

(Problem that the invention aims to solve) For this reason, when attempting to weld a workpiece made of a material that requires preheating, such as the above-mentioned high carbon steel, the welding process involves two steps: preheating and welding at separate locations. Therefore, in order to achieve uniform quality, accurate time management is required from the completion of preheating to the time to start welding, or more precisely from the completion of preheating to the time to complete welding. That is, the workpiece is taken out from the preheating device,
It is required that the time it takes to place and attach the welding device in a predetermined position is exactly a certain amount of time.

However, the time required to transfer a preheated workpiece between two geographically distant locations, unload it from the preheating device, attach it to the welding device, operate the start switch of the welding device, etc. cannot be accurately fixed. It's difficult to keep it that way.

Furthermore, even if the required time described above could be strictly controlled, the atmospheric temperature when transporting the preheated workpiece changes depending on the season and time of day, so if there is a long transport distance, welding It becomes difficult to maintain the preheating temperature strictly constant.

For this reason, when particularly high quality is required for the workpiece, a considerable amount of effort is required for such indirect work such as time management or temperature management.

Furthermore, as mentioned above, the operator must always remain attached to the device in order to transfer the preheating device to the welding device.

This invention was developed in light of these current circumstances, and is a fully automatic welding system that includes preheating and allows for easy and high quality welding of workpieces made of materials that require preheating, such as high carbon steel. The purpose is to provide equipment.

(Means for solving the problem) The fully automatic welding device with a preheating function according to the present invention has the following features:
Preheating means and automatic welding means for preheating and welding a target work; a moving table for mounting and fixing the target work and moving it relative to the preheating means and automatic welding means during the preheating and welding; A fully automatic welding device with a preheating function, which is equipped with a control device for controlling the operation of the welding torch portion of the automatic welding means (including a holder and the like that may be replaced depending on the type of welding), and a preheating means. The preheating torch portions are arranged such that their standby positions are separated from each other, and the control device controls the preheating torch portion to move from the standby position to a predetermined position close to the workpiece on the movable table during preheating prior to welding. While moving to the preheating position, the moving table moves relative to the preheating torch section to preheat the part of the workpiece to be welded. When the preheating is completed, the preheating torch section retreats to the standby position and the welding torch section is moved from a standby position to a predetermined welding position close to the workpiece on the movable table, and the movable table is moved relative to the welding torch portion to weld the preheated portion to be welded. During welding, the preheating torch and the welding torch are automatically positioned at predetermined positions with a time difference relative to the movement trajectory drawn by the relative movement of the part of the workpiece to be welded. The invention is characterized in that it is configured to be controlled so as to perform the following operations.

(Function) Therefore, the fully automatic welding device with a preheating function according to the present invention configured as described above can perform preheating and subsequent welding by placing the workpiece at a predetermined position on the movable table. Since it operates automatically according to predetermined procedures and processing contents (work contents), products of uniform quality can always be obtained. In addition, since preheating and welding are performed continuously while the workpiece is placed on a single moving table, the operator is freed from the troublesome work of carrying out, transporting, and attaching the workpiece under strict time management. be done.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a partial front view showing the configuration of the main parts of a fully automatic welding device with a preheating function according to the present embodiment, FIG. 2 is a partial enlarged front view showing the detailed configuration of the preheating torch portion of the device, and FIG. The figure is a flowchart showing a series of control operations stored in a control device within the device.

In FIG. 1, 1 is a welding torch part of an automatic welding device, 2 is a preheating torch part of a preheating device, 3 is a type of rotary table that is a moving table, 4 is a workpiece,
5 is a clamp center that lowers and fixes the workpiece 4 on the rotary table 3 from above, and A is a control device.

The welding torch portion 1 is attached to the tip of a rod 8a of an actuator 8 disposed at one end of the horizontal member 6 via an arm member 10, and on the other hand,
The preheating torch portion 2 is attached to a rod 9a of an actuator 9 disposed at the other end of the horizontal member 6.
is attached to the distal end of the arm member 11 via an arm member 11. The horizontal member 6 is the vertical member 7 of the machine base.
It is fixedly attached to the Further, the rods 8a and 9a of the actuators 8 and 9 are configured to expand and contract with respect to the cylinders 8b and 9b (see solid line arrows). The arm member 10 is configured to be freely rotatable with respect to the rod 8a and to be freely adjustable in the axial direction of the rod 8a and the arm member 10 (see the dashed arrow).
Further, the arm member 11 includes two members 11a, 1
1b, the member 11a can freely rotate with respect to the rod 9a and adjust the axial direction of the rod 9a,
The member 11b is configured to be freely rotatable and axially adjustable with respect to the member 11a (see the dashed arrow).
Further, the welding torch 1 is configured such that its attachment angle and attachment position can be adjusted with respect to the arm member 10 (see the broken line arrow), and as a result, the angle and positional relationship of the welding torch with respect to the workpiece can be freely adjusted. Incidentally, since the preheating torch 2 is also configured to have a degree of freedom with respect to the member 11a of the member 11b, the angle and positional relationship of the preheating torch with respect to the workpiece can also be freely determined.

The rotary table 3 has a jig 3a formed thereon for attaching a workpiece, and is configured to be rotated by a motor or the like (not shown) built in the base 12.

The clamp center 5 above the rotary table 3 is
It can be raised and lowered by an actuator (not shown) (see solid line).

The preheating torch section 2 also includes a burner section 2a at the tip, as shown in FIG.
is connected. Further, a pilot device 2c for ignition is disposed near the bottom of the burner portion 2a,
A high-pressure cord 2e and a pilot gas pipe 2f are connected to the pilot device 2c, and an ignition confirmation sensor 2d for checking the ignition of the burner section is disposed near the top of the burner section 2a. A solenoid valve (not shown) for supplying and shutting off gas is installed in the middle of the supply pipe 2b and the pilot gas pipe 2f.

Although the details are not shown, the control device A is composed of a storage unit, an arithmetic unit, etc., and the storage unit has a series of control processes controlled according to a flowchart as shown in FIG. is stored, and the arithmetic unit operates to compare various data input from sensors etc. with data stored in the storage unit and make a decision.

The connection relationship of this control device A (see Figure 1) is as follows:
Although not shown, it is electrically connected to the control devices (electromagnetic switches, solenoid valves, motors, etc.) and sensors that control the welding device, preheating device, motor, each actuator, etc. described above, and controls each device of this device. Control as follows.

That is, the workpiece 4 is set at a predetermined position on the rotary table 3 and a start switch (not shown) is turned on. When turned on, the clamp center 5 descends and fixes the workpiece 4 to the rotary table 3. Subsequently, the rotary table 3 rotates at a predetermined preheating speed, the rod 9a of the actuator 9 extends, and the preheating torch 2 approaches a predetermined welding location on the workpiece 4 side. Next, the pilot device 2c operates and the pilot ignites, and the solenoid valve (not shown) of the supply pipe 2b
opens, and the burner portion 2a ignites. Then, when the ignition of the burner portion 2a is confirmed by the ignition confirmation sensor 2d, the process moves to the next step. Further, if ignition is not confirmed, the gas supply pipe 2b and the pilot gas pipe 2f are shut off, and the subsequent cycle is interrupted. Once the ignition is confirmed, the preheating time time count starts.
The area to be welded is preheated for a predetermined period of time (or to a predetermined preheating temperature). When a predetermined preheating time is completed, the solenoid valves of the supply pipe 2b and the pilot gas pipe 2f are closed to cut off the gas and extinguish the fire in the burner portion. Subsequently, the rod 9a of the actuator 9 contracts and the preheating torch portion 2 retreats. When the rotary table 3 rotates to a predetermined welding start point and stops, the actuator 8
The rod 8a extends and the welding torch portion 1 advances toward the workpiece 4. When you move forward to the specified position,
Welding of the preheated predetermined locations to be welded is started, and at the same time, the rotary table 3 starts rotating at the welding speed. Then, when welding at the specified location is completed,
At the end of the welding cycle, the rod 8a of the actuator 8 contracts and the welding torch 1 retreats. Then, the clamp center 5 moves up and the entire cycle ends. At this point, the operator only has to remove the workpiece 4 from the rotary table 3.

Therefore, by simply setting the workpiece at a predetermined position on the rotary table and turning on the start switch, the operator can always perform welding in the same preheated state as described above.

Further, the shape of the jig and the arrangement of the preheating torch and welding torch may be changed as appropriate depending on the shape of the workpiece or the preheating/welding location. Also, preheating and
Depending on the welding location or the shape of the workpiece, a movable table capable of complex rotary motion including reciprocating motion may be used instead of the rotary table.

Furthermore, focusing on the fact that preheating and welding are performed with a time lag, we installed a welding torch part and a preheating torch part at both ends of a single horizontal member, and moved this horizontal member in the axial direction with the workpiece in the center. It may also be configured such that preheating and welding are performed in conjunction (in conjunction) by reciprocating.

In FIG. 1 used to explain the above embodiment, the solid line arrows indicate operations that are automatically performed based on the control of the control device, and the broken line arrows indicate operations that are performed automatically by the operator according to the shape of the workpiece, etc. This shows the degree of freedom of the connecting part that can be adjusted by.

(Effects of the invention) The fully automatic welding device with preheating function according to the invention has the following features:
As mentioned above, just by setting the workpiece on the table, preheating and welding will be performed continuously and strictly uniformly in terms of time and motion, automatically setting time differences based on the control of the control device. This allows for high quality welding. In addition, the operator can simply attach and detach the workpiece and press the start switch, thereby freeing the operator from the troublesome work required in the past. As a result, one person can handle multiple devices,
Work efficiency is dramatically improved.

In addition, since this device occupies only a relatively small fixed area, if you surround the device with a partition wall,
It becomes possible to maintain a constant temperature atmosphere at all times, and therefore it is also possible to obtain higher quality welding.

[Brief explanation of drawings]

FIG. 1 is a partial front view showing the configuration of the main parts of a fully automatic welding device with a preheating function according to the present embodiment, FIG. 2 is a partial enlarged front view showing the detailed configuration of the preheating torch portion of the device, and FIG. The figure is a flowchart showing a series of control operations stored in a control device within the device. 1...Welding torch part, 2...Preheating torch part,
3... Rotating table (moving table), 4... Workpiece, 5... Clamp center, A... Control device.

Claims (1)

[Claims for Utility Model Registration] Preheating means and automatic welding means for preheating and welding a target workpiece, and a method for mounting and fixing the target workpiece relative to the preheating means and automatic welding means during the preheating and welding. A fully automatic welding device with a preheating function, which is equipped with a movable table that moves the table and a control device that controls these operations, wherein the welding torch portion of the automatic welding means and the preheating torch portion of the preheating means are moved to their standby position. The controller is configured to move the preheating torch portion from the standby position to a predetermined preheating position close to the workpiece on the movable table and move the movable table during preheating prior to welding. The preheating torch moves to preheat the part of the workpiece to be welded, and when the preheating is completed, the preheating torch moves back to the standby position and the welding torch moves from the standby position to the position on the moving table. The preheating torch and welding torch are moved to a predetermined welding position close to the workpiece, and the moving table is moved relative to the welding torch portion to weld the preheated portion to be welded. , is configured to automatically control a series of operations to continuously position the part of the workpiece to be welded at a predetermined position with a time difference with respect to a movement trajectory drawn by relative movement. Fully automatic welding equipment with preheating function.