JPS608146B2 - Clamp device in friction welding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a friction compression machine, and more particularly to a clamp device for gripping a stationary side workpiece.

After friction pressure is applied, a pair of workpieces placed opposite each other are brought into contact under thrust while rotating relative to each other, and the frictional heat generated at that time is used to provide support, as shown in Figure 1. The stationary side work piece 3, which is placed opposite the rotating side work piece 2 gripped by the rotary chuck 1, is held in the clamp 4 with its tail end abutting in the axial direction by a thrust receiver (not shown).
, 5, the outer periphery is gripped by the fixed side work piece 3.
If the head (near the joint) is formed with a different diameter compared to other parts, this may be due to misalignment, or due to some other reason, the front clamp 4 may be attached to the joint of the work piece. If they are located relatively far apart, vibrations will occur in the stationary side work piece 3 during the friction heat generation process due to the deflection between them, resulting in a decrease in pressure acid strength and dimensional accuracy, resulting in friction welding. This has disadvantages in that the reliability of the machine itself is reduced, and the work environment is deteriorated due to the generation of noise and vibration of the machine base. In view of the above-mentioned drawbacks, the present invention has been developed to provide a structure that is fixed at a position as close as possible to the joining part of the workpiece, and even if there is misalignment between that part of the workpiece and the main body part, the workpiece remains firmly in the same position as possible. The purpose of this design was to provide a clamp device that can be gripped by a person.

The present invention will be explained in detail below based on the illustrated embodiments. In the friction saddle machine shown in FIG. 1 whose outline has already been explained, the work piece 2
, 3, a clamping device 6 according to the present invention for gripping the stationary side work piece 3 is disposed as close as possible to the joint of the fixed side workpiece 3, and the clamping device 6 is constructed as follows. ing.

Reference numeral 7 designates a pair of clamp tables that can move forward and backward toward the fixed workpiece 3 while being guided by a rail 8 that is fixed in conjunction with each other. It is connected to a pressure cylinder 12 via pivotable levers 10,10 and links 11,11.

A gripping claw 13 is attached to the clamp table 7 by a pin 14, and is capable of contacting the workpiece 3 and is rotatable (swingable) in a direction perpendicular to the center of the workpiece 3. The gripping claw 1
A pair of inclined surfaces 15 are provided on the side green portion of No. 3 with the pin 14 in between.
, 15 are formed. A cylinder 16 installed vertically in the clamp base 7 and cylinders 17 and 18 perpendicular to the cylinder 16 are bored in the clamp base 7, and a pair of pistons I9 and 20 are inserted into the cylinder 16 by iron. Pressing pieces 21 and 22 are inserted into the cylinders 17 and 18, respectively. The pistons 19 and 20 are respectively provided with protruding pieces 23 and 24, and the pistons 19 and
The two rivers are biased in the direction of approaching each other. It should be noted that the pistons 19 and 20 are constructed so that a space is formed between these end faces even when they approach each other at their maximum, and
The space is in communication with a source of pressure fluid through a through hole 26. Each of the pistons 19 and 20 has an inclined surface 2 at its tip.
7, 28 are formed, and these inclined surfaces 27, 28 are formed on the inclined surfaces 29, 30 formed at the tail portions of the pressing pieces 21, 22.
The inclined surfaces 31 and 32 formed on the heads of the pressing pieces 21 and 22 are in contact with the inclined surfaces 15 of the gripping claws 13.
, 15 is possible. A spring 33 is stretched between the gripping claw 13 and the clamp base 7, and the biasing force of the spring 33 prevents the gripping claw 13 from tilting downward excessively in the free state.

Note that the pistons 19, 20 and the pressing pieces 21, 22
etc. are collectively referred to as fixing means. To explain the operation of the apparatus of the present invention having the above-mentioned structure, the rotating side workpiece 2 is gripped by the rotary chuck 11 in the same manner as in the conventional method, and the stationary side workpiece 3 is placed at a set position, and then its main body is Clamp the part 4
.

At this time, the gripping claws 13, 13 can swing around the pin 14'14, so even if D of the gripping portion of the workpiece 3 deviates from that of the main body, the workpiece
can be grasped. If pressure fluid is continuously supplied into the cylinder 16 through the through hole 26, the piston 19,
20 move in the direction of separation from each other, and the pressing pieces 21 and 22 move to the left in FIG. Then, the gripping claws 13 are pressed and fixed. At this time, regardless of the rotation angle of the gripping claw 13, the piston 19,
20, the gripping claws 13
It is possible to always press and fix with an even pressing force in the opposing rotation directions. In this state, the gripping of the stationary side work piece 3 is completed, and friction pressure is subsequently applied by a known method, but since the stationary side work piece 3 is firmly gripped near the joint, there is no harmful vibration. It is possible to perform good friction pressure rolling without causing any friction. Note that a pair of gripping claws 13,1
Regarding both of 3, the self-pressing pieces 21, 21, 22, 2
Ideally, one of the pressing parts 21' and 22 should be firmly pressed and fixed while the other is in a free state, as shown in FIG. a piston 35 in each tail of ';
It is also possible to carry out the present invention by forming 36 and configuring it to be operated directly by pressure fluid supplied behind it. As described above, according to the present invention, it is possible to firmly grip the stationary side workpiece at a position as close as possible to the joint part and in a state that follows the joint part even if this part is misaligned with the main body part. Because of this, there is no vibration in the workpiece during friction pressing, and therefore the friction heat generation process is carried out well, improving the pressing quality and having no adverse effect on the working environment. It has an effect.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a front view for explaining the outline of a friction rolling machine, Fig. 2 is a front view showing the clamping device of the present invention, and Fig. 3 is the main part. 4 is a sectional view taken along the line W-W in FIG. 3; and FIG. 5 is a sectional view showing another embodiment corresponding to FIG. 4. 2.0 Rotating side work piece, 3... Fixed side work piece, 6... Clamp device, 7... Clamp stand, 12... Pressure cylinder, 13... Gripping claw, 15... Inclined surface, 21 ,22,
21', 22'... Pressing pieces. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. A workpiece held by a rotating clamp and forcibly rotated is brought into frictional contact with a relatively long workpiece held by a stationary clamp under thrust, and pressure welding is performed using the frictional heat generated at that time. In the above-mentioned work piece, the workpiece is disposed as close as possible to the joining portion of both workpieces, is movable forward and backward in the direction of clamping the fixed side workpiece, and is swingable in a direction perpendicular to the axis of the workpiece. A clamping device for a friction welding machine, comprising a pair of gripping claws and a fixing means for regulating the swinging of the gripping claws.