JPS594987A - Charger for friction welding machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a loading device for a friction welding machine.

Friction welding machines press a rotating or pivoting workpiece against a stationary workpiece and join the two workpieces by friction welding. Workpieces of various shapes and dimensions are selectively joined in this manner, while the workpieces are mechanically chucked to ensure precise alignment of each workpiece with respect to each other to achieve the desired weld. It is required that they be properly oriented within. A typical loading device includes two jaws that close along a centerline to grip the symmetrical machined surface of the workpiece, thereby directing the workpiece against the chuck of the friction welding machine. Some workpieces, however, do not have symmetrical machined surfaces that can be gripped.

And in such cases, the closing motion of the loading device along the centerline will not accurately align the work pieces.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a loading device for a friction welding machine that properly presents a workpiece to the chuck of a friction loading device even though the loading device grips an unmachined surface of the workpiece. It is to be.

Other objects and advantages of the invention will become apparent from the following portion of the specification and the accompanying drawings, which describe, in accordance with the requirements of the patent laws, the presently preferred embodiment employing the principles of the invention.

In FIG. 1, the loading device, indicated generally by the reference numeral 10, includes a grip assembly 12 mounted on one end of a displaceable arm 13. As shown in FIG.

Arm 13 is effective to selectively displace grip assembly 12 from preload 14 and the chuck of a friction welding device (not shown). The preloading section 14 has a positioning pin 1
5. Accurately position the work piece W. The hole 17 and the end 18 of the workpiece W are precisely positioned by the preload 14, but the outer surface 19Il' of the workpiece
If there is no alignment, there will be a misalignment with respect to the center line of the work piece.

The grip assembly 12 is comprised of an upper frame member 20 and a lower frame member 23, both of which support a jaw module 21 consisting of a stack of opposing jaws. Jaws 22, normally biased in a closed position, are forced into an open position by hydraulic seals 24. Second hydraulic cylinder 26
are provided for locking the jaws 22 in a desired position, which will be explained in more detail below.

As can be seen from FIG. 2, when both jaws 22 sandwich an irregular work piece W located in the preloading section 14, each class 22 does not close symmetrically with respect to the center line CL but is misaligned. Independently engages workpiece surface 19. Both jaws are
It is then locked in this gripping position while the loading arm 13 changes the gripping assembly 12 to move the work piece into the machine chuck (
(not shown). After the chuck receives the work piece, the loading assembly 22 is unlocked and opened, and the grip assembly 12 is returned to the preload position. Accordingly, the workpiece W is applied to the machine chuck by the gripper assembly 12 such that the orientation of the hole 17 and end 18 of the workpiece W is determined by the preloader 14.

Next, please refer to FIG. Jaw module 21 includes a pair of pivoting sleeves 30 on which jaw 2 is mounted.
2 are stacked so that they can rotate. Both jaws 22 are located between the upper and lower pressure plates 31.320.
32 are all retained on the pivoting sleeve 30 by a retaining ring 33 (only the upper ring is shown). A compression spring 34 is mounted on an extensible rod 35 and biases the opposing jaws 22 toward their closed position. Three such springs 34 and extensible rods 35 are provided, one for each of the upper, middle, and lower opposing jaws 22. A central sleeve 36 is located between the pressure plates 31,32 and serves to limit mutual inward movement of the opposing jaws.

A pair of bolts 40 passing through the pivot sleeve 30 secure the jaw module 21 to the upper and lower frame members 20 and 23 such that the spring-biased ends of the jaws 22 are positioned between the opposing pair of actuator blocks 42. It is located in The first cylinder 24 engages the actuator block 42 together with the jaws 22, causing the jaws 22 to pivot as defined by the engagement of the actuator block 42 with adjacent portions 41 and 43 of frame members 20 and 23, respectively. the jaws 22 to the fully open position.

When the first cylinder 24 returns the actuator block 42 to release the jaws 22, the spring 34 forces the jaws into a fully closed position and is inserted into the central sleeve 36 (FIG. 3) or, as the case may be, between the jaws. Grip the broken work piece W independently (Fig. 2).

A centrally mounted puller 44 extends through the jaw module 21 and has a head 45 and a washer 46 at one end to press against the upper pressure plate 31 and is connected to the second hydraulic series 1
The end 47 that engages the piston 48 of the cylinder 26 is threaded. The second cylinder 26 is suspended from the lower frame member 23 by a port 49. When the cylinder 26 is biased thereby to retract the pull pin from the upper pressure plate 31, the cylinder housing 50 rises from the lower pressure plate 32. In this way, both positive force plates 31
．． The jaws 22 mounted between the two jaws 22 are immovable and are held stationary and restrained in position by urging the second cylinder 26 to press the pressure plates 31 and 32 together.

Although the present invention has been described above, additions and modifications may be made by those skilled in the art. .

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a loading device for a friction welding machine according to the technique of the present invention; FIG. 2 is a plan view of the loading device gripping an irregular work piece; and FIG. FIG. 2 is an exploded perspective view of the illustrated friction welding loading device. [Explanation of symbols of main parts] Stack...21 Means for opening both jaws...42 Means for moving both jaws to the chuck...13 Preliminary loading section...14 Means for closing...34 Means...26.44 Pull-out pin...44 Hydraulic cylinder...26

Claims (1)

[Claims] 1. A workpiece single-grip machine comprising two opposed workpiece single-grip jaws that move between open and closed positions, and means for opening the two opposed jaws;
and a preloading section for initially supporting a workpiece and determining the orientation of a given workpiece, in a loading device for a friction welding machine, comprising means for moving said jaws to a chuck of the friction welding machine. A load for a friction welding machine, characterized in that it comprises means for closing both jaws on one side, and means for locking both jaws in a closed position allowing the work piece to maintain the orientation determined by said preloading means. Device. 2. The loading device for a friction welding machine according to claim 1, wherein the means for closing both jaws includes a plurality of independent springs, one for each class. Loading device. 3. The loading device for a friction welding machine according to claim 1, wherein the means for locking the jaws in the closed position includes a pull-out pin biased by a hydraulic cylinder. Loading device for friction welding machines.