JPH0442062Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a welding diameter in a device that welds opposing end surfaces of two workpieces while rotating the workpieces, for example, a welding type crankshaft. Used in manufacturing fields, etc.

(Prior Art) In an apparatus for welding opposing end surfaces of two workpieces while rotating the workpieces, it is necessary to detect the diameter of the guide welding part.
There is a technique disclosed in Publication No. 84272.

In other words, this prior art has two
Welding is performed by supplying a filler rod 2 while rotating two workpieces 1. At this time, a sensor 5 is attached to the tip of an arm 4 whose diameter sensor is pivotally supported via a pin 3. , the sensor 5 is biased by a spring 6 so that it always comes into contact with the welding site.

(Problem to be solved by the invention) By the way, in the above-mentioned conventional technology, since the sensor 5 at the tip of the arm 4 is in continuous contact with the weld bead surface, when the welding diameter is small, the arm 4 The molten slag flowing to the side adheres to the sensor 5 and is not dropped and accumulates between the sensor 5 and the filler rod 2, causing defects in the slag winding.

For this reason, welding methods such as increasing the rotational speed (welding speed) of the workpiece 1, shifting the position of the welding rod 2 toward the arm side, or changing the material of the flux to prevent molten slag from flowing into the arm 4 side. It may be possible to change the conditions, but this change is not a fundamental solution.

Therefore, the present invention provides a weld diameter sensor in which the sensor contacts the weld bead for a short period of time only once per rotation + α of the workpiece so that the molten slag easily falls in order to prevent slag winding defects. The purpose is to

(Means for solving the problem) The technical means taken by the present invention to achieve the above-mentioned object are characterized by two workpieces 10 and 11.
This is a diameter sensor for welding in a device that welds the opposing end surfaces of the workpieces 10 and 11 while rotating the workpieces 10 and 11, and the elongated arm 23, which has a sensor 36 that contacts the weld bead, is vertically swung toward the fixed side. a bullet 37 which is movably mounted and urges the sensor 36 in a direction to contact the weld bead;
A pressing cylinder 39 is provided that presses the arm 23 in a direction in which the sensor 36 moves away from the weld bead against the bullet 37, and the sensor 36 presses the arm 23 when the two workpieces 10 and 11 rotate once. The point is that the weld bead is contacted only immediately after it has been welded.

(Function) In order to detect the predetermined position where the sensor 36 of the arm 23 contacts the weld bead, two workpieces 1
A pulse generator 17B is attached to the rotation shaft 17 of the rotation support device 13, 14 which rotates by chucking the pulses 0, 11.
The number of pulses transmitted in proportion to the rotation angle of the workpieces 10 and 11 is counted by the calculation section of the control panel.

That is, the number of pulses emitted per one rotation of the pulse transmitter 17B is constant (a known number), and by counting the number of pulses, it is possible to know how much the workpieces 10 and 11 have rotated.
The position where 6 contacts is determined.

The arm 23 is vertically swingable about a pin 35 on the fixed side, thereby allowing the sensor 36 to approach and separate from the weld bead.

Therefore, when the pressing cylinder 39 is extended against the bullet 37, the sensor 36 moves away from the weld bead, and when the pressing force of the pressing cylinder 39 is released, the bullet 37 causes the sensor 36 to move away from the weld bead. be contacted.

Therefore, in detecting the weld diameter, the sensor 36
When it comes into contact with the weld bead, a lever force acts on the arm 23, and this acting force is transmitted to the differential transformer 41 as a displacement amount via the link mechanism 40. If this displacement amount is converted into electricity, the displacement amount and electricity are Since the ratio of the amounts is constant, the change in the weld diameter can be understood.

All functions related to the diameter of the welding head etc. will operate in accordance with this amount of change.

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

Referring to FIG. 5, two workpieces 10, 1
1. Support devices 13, 14 for rotating the crank components on one common center line 12 in this example
One of the supporting devices 13 is provided with a rotating shaft 17 having a supporting tool 17A that is rotationally driven around a horizontal horizontal axis by a manipulator 16 that is rotated by the starting force of a motor 15. An encoder 17B for pulse generation is directly connected to. The other 14 has a supporting member 18 located on the axis of the supporting member 17 and opposing the supporting member 17, so that it can be freely moved and fixed.

The two workpieces 10 and 11 are rotatably supported by the supports 17 and 18 of the support devices 13 and 14 with their opposing end surfaces 19 abutted against each other, and can be temporarily placed on the steady rest device 20. and the opposing end surfaces 19 are welded.

Referring to FIG. 4, the entire structure of the welding device is schematically shown, and 21 is a welding head, and a torch 2 is shown.
2 and an elongated arm 23 for detecting weld beads, and extends toward the opposing end surface 19.

A welding wire 24 can be supplied to the head 26 of the torch 22 via a feed roller 25.

Reference numeral 27 denotes a flux hopper which supplies flux to the welding site via a hose 28 and which collects flux via a flux recovery nozzle 29.

30 is an assembly type preheating burner, 31 is a slag peeling chipper, and 32 is a reinforcement cutting tool, which can be attached or detached.

Referring to FIGS. 1 to 3, welding head 2
1 includes a torch drive motor 33 and an encoder 34
The elongated arm 23 is attached at its midpoint in the longitudinal direction via a pin 35 so as to be movable up and down, and the tip of the arm 23 is equipped with a sensor 36 for detecting a weld bead. The welding bead portion of the workpieces 10 and 11 can be freely moved toward and away from the welding bead portion of the workpieces 10 and 11, which are rotated in the directions shown by the arrows in FIGS. 1 and 4.

That is, the elongated arm 23 has a pair of bullets 37 suspended between the rear end thereof and the fixed side, and urges the sensor 36 in the direction of contacting the weld bead, and the contact position is It can be freely adjusted by an adjustable stopper 38 which is a screw structure.

Furthermore, a pressing cylinder 39 is shown in the form of a hydraulic piston.
is provided inside the welding head 21 at the rear end side of the elongated arm 23, and by extending the pressing cylinder 39, the arm 2 is moved around the pin 35 as a fulcrum.
3 is pressed against the bullet 37 in a direction away from the weld bead.

In conjunction with this pressing, the amount of displacement can be transmitted to the differential transformer 41 via the link mechanism 40.

The link mechanism 40 has one end of a bell crank 43 pivoted through a pin 42 with play in a long hole 44, and the other end of the bell crank 43 is attached to a vertically movable frame 45 shown in FIG. A differential transformer 4 is interlockingly connected and provided correspondingly to the upper part of the frame body 45.
1 as a displacement amount, and if this displacement amount is electrically converted, a change in the welding diameter is detected because the ratio between the displacement amount and the electrical amount is constant, and the diameter of the welding head 21 etc. is determined according to this displacement amount. It controls all functions.

(Effect of the invention) According to the invention, the two workpieces 10 and 11 are
The diameter is measured once every +α rotation, and this detected amount is sent to the welding head 21 via the control panel.
This command is given to the motor 33 and encoder 34 of the welding head to raise and lower the welding head 21 etc. according to changes in the welding diameter. This is of great practical benefit in that it not only allows measurement, but also greatly improves the durability of the sensor 36.

[Brief explanation of drawings]

Fig. 1 is a front view showing the main parts of the present invention, Fig. 2 is a view taken along the line A-A in Fig. 1, Fig. 3 is a view taken along the line B-B in Fig. 1, and Fig. 4 is a welding device. FIG. 5 is a side view of a rotary support device for a workpiece, and FIG. 6 is a front view of a conventional example. 10, 11... Workpiece, 23... Elongated arm, 36... Sensor, 37... Bullet machine, 39... Pressing cylinder.

Claims (1)

[Claims for Utility Model Registration] A diameter sensor for welding in a device for welding opposing end surfaces of two workpieces 10 and 11 while rotating the workpieces 10 and 11, the sensor 36 being in contact with the weld bead. The longitudinal midway point of the elongated arm 23 is attached to the fixed side so as to be able to swing up and down, and includes a bullet 37 that urges the sensor 36 in the direction of contacting the welding bead, and a bullet that resists the bullet 37. The sensor 36 is provided with a pressing cylinder 39 (G) that presses the arm 23 in a direction away from the weld bead, and the sensor 36 is
A diameter sensor for welding, characterized in that it comes into contact with a weld bead only immediately after two workpieces 10 and 11 are rotated once.