JPS5935719B2 - Portable friction welding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a friction welding machine, and more particularly to a portable friction welding machine that can be easily moved to a necessary location to perform friction welding.

Friction welding, in which a pair of workpieces are brought into contact under axial thrust and rotated relative to each other, and the frictional heat generated at that time is used to join them, increases the joining strength and reduces the cycle time and cost for joining. Although it is advantageous compared to various other joining methods in that it is low in pressure, it usually requires a hydraulic unit to apply axial thrust to the workpiece, which itself and in relation to it causes damage to the entire machine. As the size of the friction welding machine increases, it has become impossible to join workpieces to structures, such as the surface of steel frames or the hull of a ship, due to the structure of conventional friction welding machines.

The present invention has been made for the purpose of providing a device that makes the friction welding machine itself portable and can eliminate the drawbacks that conventional friction welding machines inevitably have as described above.

The present invention will be described in detail below with reference to illustrated embodiments. In the figure, reference numeral 1 denotes a base which has a hollow portion 2 in the center and can be appropriately fixed to a member to be pressed by an appropriate means.

When the press-welded member is made of iron-based material, it is preferable that the base 1 incorporates an electromagnet. Guide members 3 (four in this embodiment) are installed at a suitable number of locations on the upper surface of the base 1, and these guide members 3 are connected and fixed to each other by a connecting member 4 at their tips. A spindle stand 5 is slidably fitted into the guide member 3 while being guided by the guide member 3, and the spindle stand 5 is connected to the base 1 by a spring 6 interposed between the spindle stand 5 and the base 1. It is biased in the direction away from the . A spindle 7 is rotatably supported by a bearing 8 on the spindle stand 5, and a collet chuck or the like is provided at the tip end of the spindle 7 on the base 1 side for gripping and holding a press member (workpiece) W. A chuck 9 is attached. In this embodiment, a prime mover 10 called a so-called bill-tone motor is disposed between the spindle 7 and the spindle stand 5, and the spindle 7 is directly driven to rotate by the driving force of the prime mover 10. However, it is also possible to provide a separate prime mover such as an ordinary electric motor and drive it with the spindle 7 by belt transmission or the like. Further, a cam receiving member 11 is attached to an end surface of the spindle stand 5 on the side opposite to the base 1 side. The cam receiving member 11 has a convex portion formed in its center that comes into contact with a cam, which will be described later. A feeding device 12 is disposed between the end of the spindle stand 5 on the side of the cam receiving member 11 and the connecting member 4, and is guided by the guide member 3 to move independently and can be fixed at an appropriate position. The feeding device 12
has a substrate 13 having a through hole 14 approximately in the center thereof, and is rotatably fitted into the substrate 13 while being restrained from moving in the axial direction;
A support member 1 is screwed into a threaded portion 15 carved in the guide member 3 and has a sprocket 16 formed at one end thereof.
7, and a sprocket 19 moored to a chain 18 stretched across all the sprockets 16,
The cam device 21 includes a fast-forward drive device 20 fixed to the substrate 13 and a cam device (feed drive device) 21 disposed in the through hole 14 and fixed to the substrate 13. It consists of a motor 22 with a built-in speed reducer fixed to a substrate 13 and a cam 23 detachably attached to the shaft of the motor 22. The side of the cam 23 opposite to the motor 22 is connected to the substrate 13 by a bearing 24. It is rotatably supported. The cam 23 is prepared in advance in various shapes depending on the pressure welding conditions, but in the one shown in FIG. 6, the cam 23 is assumed to rotate clockwise as shown in the drawing to proceed with the pressure welding process, and point A is the starting point. The radius gradually increases and the period up to point B corresponds to the primary pressurizing process, and from point B to C
The period up to this point corresponds to the transition to the secondary pressurization process, and the radius increases slightly from point C to D, and corresponds to the process of maintaining the secondary pressurization depending on the adjustment. From point D onward, there is a smooth continuous shape between point D and starting point A. To explain the operation of the device of the present invention having the above-mentioned configuration, first, the base 1 is brought into contact with the surface of a structure (not shown) which is a press-welded member made of iron-based material. The built-in electromagnet is excited to firmly attach and fix the entire friction welding machine to a structure.

Next, the feeding device 12 stops in a state close to the connecting member 4, and the cam 23 contacts the cam receiving member 11 at point A (since the spindle base 5 is biased by the spring 6, the cam 23 (The outer peripheral surface of 23 is in constant contact with the cam receiving member 11.) After the work piece W, which is a pressing member, is gripped by the chuck 9, the feeder 12 is moved by the operation of the fast-forward drive device 20. When the spindle head 5 moves forward toward the base 1, the spindle stand 5 and the work piece W move forward toward the base 1 as well against the biasing force of the spring 6. When the tip of the workpiece W comes into contact with the pressurized member due to the forward movement,
The operation of the limit switch that detects the position of the spindle base 5 and the increase in the load on the fast-forward drive device 20 are stopped to stop the operation of the fast-forward drive device 20 and stop the feed device 12 at the position. , prime mover 10
is activated (it may be activated in advance prior to the contact between the press-welded member and the work piece W), the spindle 7 is rotated, and frictional heat generation is started between the work piece W and the press-welded member. , and the cam 23 begins to rotate due to the operation of the motor 22, and the outer peripheral surface of the cam 23 whose radius gradually increases presses the spindle base 5 in a direction away from the feeding device 12. At this time, since the feeding device 12 is in a state of engagement with the threaded portion 15 of the guide member 3 via the support member 17, the feeding device 12 does not move at all due to the external force in the axial direction of the guiding member 3. Since it is in a fixed state, the rotation of the cam 23 moves the spindle stand 5 in the direction of the base 1, and an axial thrust is applied to the work piece W and the member to be pressed. So-called primary pressure is applied between point A and point B on the outer circumferential surface of the cam 23 in contact with the cam receiving member 11, and a frictional heat generation process is performed, and between point B and point C, the cam 23 is heated. The radius rapidly increases and this corresponds to so-called secondary pressurization, where the upset process is performed. The spindle 7 is suddenly stopped at the same time as the time when the secondary pressurization is applied, or at a time just a minute before or after the application of the secondary pressure (see FIG. 7). The sudden stop of the spindle 7 is achieved by temporarily driving the motor 10 in reverse or by using a brake device (not shown). Continuing to maintain the secondary pressurization, the rotation of the cam 23 is stopped at point D (friction welding is completed at this point). Then, after loosening the chuck 9 and releasing the gripping force on the work piece W, the fast-forward drive device 20 rotates in the opposite direction to that described above, and the feed device 12 moves toward the side where it approaches the connecting member 4, Along with this, the spindle stand 5 also moves in a direction away from the base 1 due to the biasing force of the spring 6, and the cam 23 continues to rotate in the same direction as described above, so that point A touches the cam receiving member 11. It stops in the abutting state and becomes ready for the next pressure welding operation. Thereafter, by de-energizing the electromagnet built into the base 1, the friction welding machine can be moved to the next required location. In addition, in the initial stage of the friction welding process, when the press-welded member and the work piece W come into contact with each other, the rapid feed drive device 20 is stopped;
Starting the rotation of the spindle T and the cam 23
It is also possible to start the rotation etc. by manual operation by the operator.

Furthermore, if a fixing chuck is attached to the base 1, it is of course possible to perform friction welding as in the conventional case. As described above, according to the present invention, it is possible to perform friction welding on existing structures, which was not possible in the past, and it is also possible to create a simple structure using only electricity as a power source, without requiring hydraulics or pneumatics. This has the remarkable effect that it is possible to obtain a friction welding machine of

[BRIEF DESCRIPTION OF THE DRAWINGS] The figures show one embodiment of the present invention, in which FIG. 1 is a front view, FIG. 2 is a plan view, and FIG. 3 is a cross-sectional view in FIG.
4 is a cross-sectional view taken along the line V-V in FIG. 1, FIG. 5 is a cross-sectional view taken along the line V-V in FIG. 2, FIG. 6 is a front view of the cam, and FIG. 7 is a graph showing the press-welding process. 1... Base, 3... Guide member, 5
...Spindle stand, 6...Spring, 7.
...Spindle, 9...Chick, 10
..... Prime mover, 12 ..... Feeding device, 16
... Sprocket, 1T... Support member, 20... Rapid feed drive device, 21...
Cam device, 22...Motor with built-in reducer, 23.
·····cam.

Claims (1)

[Claims] 1. A spindle stand that is slidably fitted into a guide member planted on a base that can be fixed to a press-contact member as appropriate and is biased in a direction away from the base, and a spindle stand that can be driven to rotate. a spindle that is attached to the base side and has a chuck that is capable of gripping the pressure contact member at its tip end on the base side; and a spindle that is disposed on the opposite side of the base side of the spindle stand and that is guided by the guide member and moves independently to an appropriate position. The cam device may include a fixable feeding device, and a cam device that is attached to the feeding device and comes into contact with the end of the spindle base on that side so that the mutual distance between the spindle and the spindle can be changed by a preset degree of change. Portable friction welding machine.