JPH0120073Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for detecting the receiving state of the end face of a work piece and the end face of a stopper in a friction welding machine.

Conventionally, when pressing a turbine shaft against an unstable work piece formed in an umbrella shape such as a turbine wheel, the hexagonal part formed at the end of the turbine wheel is The outer periphery of the turbine wheel was fixed by the collector pad of the master collector by fitting it into the rotation prevention piece and by bringing the end face of the hexagonal part into close contact with the end face of the stopper. However, with such work piece fixing means, confirmation of the state of close contact between the end face of the hexagonal part of the work piece and the end face of the stopper relies on the operator's senses, and the hexagonal part of the work piece is not exposed to cast burrs or the like. If the work piece is fixed without noticing this, the end face of the hexagonal part of the work piece and the end face of the stopper will not come into close contact, causing damage to the pressure welding machine or causing the upset pressure to be completely applied to the work piece. No load is applied, which causes poor press contact, and the inability to obtain a perpendicularity between the work piece and the shaft-like member, which causes poor accuracy. In addition, if the operator mistakenly fixes the workpiece without aligning the hexagonal part of the workpiece with the hexagonal part of the detent piece, the workpiece will not be able to be grasped completely because it will shift relative to the grasping position of the collet pad. This has caused various problems, such as causing abnormal pressure contact and damage to the detent piece due to the upset pressure.

The purpose of the present invention is to solve the above-mentioned problems by providing an air outlet on the workpiece contact surface of the stopper that constitutes a part of the thrust receiver. It is an object of the present invention to provide a work piece grasping abnormality detection device in a friction welding machine, which detects the abnormality using a pressure switch. The present invention will be explained in detail below based on the illustrated embodiments.

In the figure, 1 is the main body of the fixed chuck;
At the front end of the main body 1, a suitable number of contact members 3 for gripping the outer circumference of the work piece 2 are fixed to a master collet 4 with bolts. The end of the work piece 2 has a hexagonal anti-rotation protrusion 2a, and the anti-rotation protrusion 2a is supported by a thrust receiver 5 provided inside the fixed chuck body 1.

The thrust receiver 5 includes a rod member 6 having an appropriate number of air passages 7 fixed to the frame (not shown) of the main body 1, and is fixed to an end surface of the rod member 6, with one end connected to the air passage 7. a stopper 8 having an air passage 9 communicating with the work piece 2 and having an air outlet 8a at a position where the other end abuts the end surface of the detent projection 2a of the work piece 2;
A detent piece 10 is fixed to the end face of the stopper 8 and has a hexagonal fitting hole 11 into which the hexagonal detent protrusion 2a of the work piece 2 can fit, the rod member 6, and the stopper. 8. Keys 12 and 13 for preventing rotation of the rotation prevention piece 10
and a bolt 1 for fixing the keys 12 and 13.
4, 15, and a rotation stopper piece 1 on the rod member 6.
0. It is composed of a bolt 16 for fastening the stopper 8.

A pressurized air supply circuit 24 as shown in FIG. 4 is connected to the air passage 7. The pressurized air supply circuit 24 is configured such that pressurized air introduced from a pressure air supply source such as a compressor is passed through a filter 17 with a steam/water separator, a pressure reducing valve 18, a throttle valve with a check valve 19, and a pressure switch 20 to a solenoid valve 21. The circuit is configured so that it can be switched between a circuit that is supplied to the air passage 7 and a circuit that is open to the atmosphere. 22 is a pressure gauge and 23 is a pressure detection device.

The present invention has the above-mentioned structure, and its operation will be explained next. When the work piece 2 is inserted into the inner diameter part of the workpiece 3 and the outside diameter part of the workpiece 2 is lightly held by the workpiece 3, Hexagonal anti-rotation protrusion 2a of the work piece 2
into the hexagonal fitting hole 11. At this point, the solenoid valve 21 is not energized, and the pressurized air is released to the atmosphere by the solenoid valve 21. After the rotating side work piece is lightly grasped by the rotating side chuck (not shown), the grasping pressure is lowered and the slide table is advanced to bring the work piece 2 and the rotating side work piece into contact. At this time, if there is a gap between the work piece 2 and the stopper 8 or between the rotating side work piece and the stopper, the forward pressure of the slide table will cause both the work piece 2 and the rotating side work piece to come into close contact with their respective stoppers. do. After this,
At the same time that the set gripping pressure is supplied to each chuck on the rotating side and the stationary side, the solenoid valve 21 is energized by a control device (not shown), and pressurized air is supplied to the air passage 7 extending through the rod member 6. The air is sent from the air passage 9 of the stopper 8 to the air outlet 8.
Head to a.

Therefore, when the end surface of the rotation prevention protrusion 2a of the work piece 2 is in close contact with the stopper 8, the outlet of the pressurized air is blocked, so the air pressure increases and the pressure switch 20 is turned on, causing the pressure When the meter operates and reaches the set pressure, the solenoid valve 21 is de-energized and the pressurized air is released to the atmosphere. Then, the slide table temporarily retreats, the spindle is rotated, and normal friction welding work can be performed.

If there is a cast burr on the end surface of the detent projection 2a of the work piece 2, and if the detent projection 2a is
If they are not fitted, a gap is created between the end face of the detent projection 2a and the stopper 8, and the pressurized air escapes into the atmosphere through this gap, so that the air pressure does not increase. Therefore, the pressure switch 20 does not operate, and an abnormality occurrence alarm device (not shown) operates to stop the machine.

As described above, according to the present invention, at the position where the end face of the workpiece comes into contact with the thrust receiver that receives the workpiece,
By providing an appropriate number of air outlets and connecting a pressure air supply circuit equipped with a pressure detection device to the air supply side of the air outlet, the air of the stopper that forms part of the thrust receiver is When the end face of the work piece is in complete contact with the air outlet, the work piece has already fitted into the anti-rotation piece, the axes of both work pieces to be pressed are aligned, and normal pressure welding is possible. Since it is possible to mechanically check the grasping state of workpieces with unstable shapes for the friction welding machine, it is effective for maintaining the machine and improving processing accuracy and productivity.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention; Fig. 1 is a sectional view of the main part, Fig. 2 is a front view, Fig. 3 is a cross-sectional view of Fig. 1, and Fig. 4 is a pressure air supply circuit diagram. be. 2... Processed piece, 2a... Anti-rotation protrusion, 3...
This material, 4... Master collect, 5... Thrust receiver,
6... Rod member, 7, 9... Air passage, 8... Stopper, 8a... Air outlet, 10... Stopper piece, 11... Fitting hole, 17... Filter with steam/water separator, 18... Pressure reducing valve, 19... Throttle valve with check valve, 20... Pressure switch, 21... Solenoid valve, 22... Pressure gauge, 23... Pressure detection device, 24... Pressure air supply circuit.

Claims (1)

[Scope of utility model registration request] In the friction welding machine, an appropriate number of air outlets are provided at a position where the end face of the work piece comes into contact with the thrust receiver that receives the work piece, and a pressure detection device is installed on the air supply side of the air outlet. A work piece grasping abnormality detection device in a friction welding machine, characterized in that a pressurized air supply circuit provided with the above is connected.