SU647084A1 - Pressure-welding apparatus - Google Patents

Description

one

The device relates to a welding technique and can be used to overlap pipes and tubular products without melting the edges of the parts to be welded.

Devices are known for welding metal rollers of various parts and workpieces in vacuum, which are different variants of contact roller welding i,

Such devices are unsuitable for welding. Tubular parts of small sizes, as it is impossible to install a support roller inside the pipes to be welded, and the devices themselves have a bulky design.

The closest to the technical essence of the present invention is a pressure welding device comprising a heater 1 and compression rollers EZ.

In the known device, their rollers are made of metal, and the forces on the cylinder are mounted on a special device. Long-term operation of such a tool is impossible due to the heating elements of the device. In the case of welding of low-melting metals, heating to high temperatures is not required and the tool can work for a longer time. The device does not have control over the process parameters, which requires the use of additional mechanisms and hardware;

The purpose of the invention is to improve the quality of welding due to the constant monitoring of the temperature of the heated joint, as well as increasing the service life of the sizing rollers.

For this, one of the crimping rollers is equipped with a thermionic sensor built into it. In addition, the crimping rollers are made of refractory ceramics.

Pa figs. 1 and 2 in two projections depicts the proposed device for pressure welding; in fig. 3 is an automatic control circuit for squeezing rollers.

Claims (2)

The composite ceramic roller 1, designed for crimping 2, is mounted on axis 3, which in turn is fixedly fixed in the insert 4. Fastening is carried out with the help of the sub-tandem housing 5 on the bearing b with retaining rings-L 7 and 8. A bushing 9, a cup 10 and a cover 11 with a spring 12 to the metal ring 13 on the side surface of the roller are pressed graphite current collector 14, which transfers the current of thermal emission from the copper sensor 15 to the recording instrument. The registration circuit of the thermal emission NFgo current Р-Р should be closed on the SOURCE of the power supply with the fixing device (not shown). To remove possible spraying (during long-term operation of the device) and prevent the circuit of the thermal emission sensor from short-circuiting, a cleaning roller is installed on the bracket 17. In the rod of the plug 4 there is an index of deforming forces 18 transmitted to roller 1 from the help of spring 19. To operate the device in automatic mode, the system of knock switches 20 is driven by a pin 21. roller 22, in contrast to component & roller 1, is made monolithic from Ceramics. and has a similar force transmission using a calibrated spring. Crimp force limiter 23 turns off the roller feed when the maximum allowable load is reached. the rotation of the welded workpieces 2, the heating source, for example, an electron beam with a focal spot 24, creates a ring heating. Before work begins, rollers 1 and are retracted into the initial position, which allows changing the blanks and adjusting the Vatgift 21; set the required amount of compression on the end switch. 20; set the limit of the deforming efforts of setting limiter 23; Using a rheostat 38 (see Fig. 3), set the micro-speed during crimping. After the device has been set up, the parts to be welded are installed, the air is pumped out to a high vacuum, the welded parts are rotated. The rotation is directed to the side: Roller 1 controlling T (Erm6 emissive temperature sensor in the deformation zone). Then, sources of local heating are switched on, for example, an electric beam, followed by a crimping device. The CTBd crimping device is turned on by a toggle switch 25 (see, 4ig. 3) and button 26, after which it closes the coil circuit of the relay 27, its contacts 28, 29 and 30 including the reverse current AC motor, the winding of which is indicated by 31 (see Fig. 3). At the same time, the contacts 32 block the relay 27. Relay 27. coil is powered through normally-closed contacts 33 when the button 26 returns to its original position. Through the transmission system (not shown in the diagram) from the electric motor, fast translational progress is made rollers movement to the heated junction at which time the welded parts 2 (see FIG. 1). At the beginning of the movement of the crimping rollers, the limit switch 34 (see Fig. 3) retreats and closes the contacts preparing the power supply to the relay coil 35. As the pin 21 approaches the microswitches 20, the fast feed mechanism 36 is turned off and due to its inertia chain of microfeeds 37 (see fig. 1). In FIG. 3, this switching is indicated by an intermediate microswitch 38. The squeeze roller transfers to small feeds set by the rheostat 39 and during the deformation process (for example, if the V butt joint is insufficiently heated) can be temporarily switched off by the limiter of deforming forces 23 (see Fig. 1 ) or by a microswitch 40 (see Fig. 3). In the process of deforming the rollers 1 and 22 of the rotating billets 2, the thermionic emission sensor detects the thermal emission in the deformation zone and judging by its value on the recording device (not shown) the heating temperature of the welding zone. When the final deformation A is reached, the microswitches installed on the system The 20 pin 21 will open the circuit contacts, feed the coil of the relay 35, and open the motor power supply circuit (in Fig. 3 this switching is carried out by the microswitch 41). When relay 35 triggers, it locks its coil with contacts 42, contacts 33 opens the coil supply circuit of relay 27 and turns it off, simultaneously closing the coil circuit of relay 43, which, in turn, closes the reverse feed roller circuit with its contacts (reverse rollers). The crimping tool begins to return to its original position, which is fixed by end switch 34 (see Fig. 3). The circuit of the coil of the relay 35 is opened, its microswitch 34 switches off the relay 35 and de-energizes the electric motor. The crimping tool stops at the initial position and is driven after changing the welded parts 2 by turning on the button 26. The automatic welding cycle is repeated. Crimping Tool is easy to operate. Switching it on is done with one button. In the process of welding, all Technological parameters are maintained automatically, without participation of the operator. The welded parts are of the same type quality, which allows control of the release of my batch with checking (or testing) of one sample. Claim 1. Device for pressure welding, mainly pipes of dissimilar refractory metals, containing a heater and compression rollers, characterized in that. that, in order to improve the quality of the weld- ing by exercising constant monitoring of the temperature of the heated joint, one of the crimping rollers is equipped with a thermal emission sensor built into it. 2. The device according to claim 1, from which it is designed so that, in order to increase the service life of the sizing rollers, they are made of refractory ceramics. Sources of information taken into account in the examination; 1. USSR author's certificate 136488, cl. At 23 K 11/08, 08.26.60. 2. Glukhanov N.P., Bogdanov V.N. Welding of metals with high-frequency heating. M.-L., Mashgiz, 1962, p. 160.