SU766805A1 - Machine for automatically welding curvilinear products - Google Patents

Description

The invention relates to welding, in particular to devices for welding on a copy of a curved contour, for example canisters.

A known installation for automatic arc welding of seams of complex configuration, comprising a village with a welding head fixed on it, a drum rotating relative to the station, inside which is placed a container with welded product, a drive for rotating the drum, a drive for moving the container containing a lead screw of the adjustment system 5 welding arc and the speed of movement of the product, as well as an additional drive to move the container 1.

However, the mechanisms and the electrical system in a known design work with jerks with frequent starts and stops, due to the presence of several drives, working separately, which leads to instability of the welding speed and mismatch of the welding parameters, 25 the presence of the container limits the dimensions of the welded parts, the presence of several drives complicates the kinematic scheme and control system, which reduces its reliability. 0

A device for automatic welding of closed seams with straight and rounded sections, containing a welding head, a bracket with a copier, a driving roller, interacting with the inner surface of the copier and a spring-loaded driven roller mounted on the lever and interacting with the outer surface of the copier, and mounted on the bracket is known. and a copy of a two-parallelogram pantograph with a counterweight to reduce the oscillations of the copier, in the process of its movement 2..

However, the presence of a two-parallelogram pantograph with a counterweight complicates the design and, in addition, does not allow to exclude oscillations of the copier with the product due to the large inertia.

The purpose of the invention is to simplify the design while improving the quality of welding by reducing oscillations of the copier with the product during its movement.

To achieve this goal, on the outer surface of the copier, a main additional copier track is mounted parallel to it, a straight groove is made on the straight section of the track, and one of the tracks of the groove is placed on one side of the rounded section, connecting two straight lines. On the other side, the grooves are located on the other side of this section, with an additional driven roller mounted on the lever, which interacts with the additional copier track of the copier. FIG. 1 shows the proposed device in FIG. 2 section A-A in FIG. Ij in FIG. 3-node I figure 2. The device for automatic welding contains a double-hinged bracket 2 mounted on the base with a rotary shaft 3, a pneumatic cylinder 4 for clamping the piece and a copier 5 fixed on the shaft 3. The base also has an electric motor 6 connected kinematically to the drive roller 7 interacting with the inner surface copy 5, corresponding to the contour of the product to be welded 8, as well as spring 10 spring 9 lever with two driven rollers 11 and 12 and spring spring lever 13, equipped with a welding torch 14 and following role room 15. The burner 14 is set at an angle about: the plane of the product, based on the optimum welding conditions. On the outer surface of copier 5 there are mounted main and additional copier tracks, which are equidistant to its inner contour except for grooves 16, made on the straight sections of these tracks, and on one track the grooves are located on one side of the rounded section, and on the other track grooves placed on the other side of this site. The device works as follows. The product is fixed on the bracket 2 by the pneumatic cylinder 4, while the following roller 15 must touch the contour of the product 8. Then turn on the electric motor b, rotating the drive shaft 7 and ignite the arc between the product 8 and the electrode of the welding torch 14. As a result, the copier 5 together with The product 8 moves between the lead 7 and the driven rollers 11 and 12 relative to the electrode of the welding torch 14, and at the same time the part is welded. From the moment the arc is ignited, the welding process takes place automatically. During the welding process, the double-hinged bracket 2 provides, within its longest length, the movement of the axis of the shaft 3 together with the product 8, allows welding parts of various sizes and shapes at a constant speed. The grooves located on both sides of the rounded section are designed to prevent the copier from vibrating at the transition from the straight to the rounded portion and from the rounded to straight, In the absence of grooves, the driven roller 12 falling onto the rounded portion first along the copier 5 will hang . Hanging roller 12 will cause the copier 5 to turn by the force of the spring 9 transmitted through bracket 3 and roller 11 to the copier 5. Turning the copier 5 all the way into roller 12 will cause the roller 11 to hang and increase the gap between the burner. 14 and product 8. A similar picture will take place at the transition from a rounded section to a straight line. The absence of grooves leads to oscillations of the copier during the transition from the rectilinear section to the radius and then from the radius section to the rectilinear section. In the proposed device, the rollers 11 and 12 interact with the grooves in turn. When roller 12 begins to move along a rounded section, roller 11 begins to move along a groove located on one of the copy tracks. When roller 12 passes an arc of a circle, roller 11 lowers to the bottom of the groove. Then, when the roller 12 passes the next 30 ° along the arc, the roller 11 will exit the groove, Next, the roller 12 will pass the remaining portion of the rounding-up of the contour of copier 5, and enter from the groove to another copier track. The roller 11, meanwhile, will begin and will continue to move along a rounded section. When roller 12 comes out of the groove, roller 11 will end its movement around the curve of the copier. Moving along the straight sections of their copy tracks, rollers 12 and 11 will start simultaneously. The constant contact of the driven rollers 12 and 11 s along the top of the copier, at the rounding, is achieved by the fact that the radii of both edges of each groove are equal to the rounding radius of the external contour of the copier. Thus, irrespective of the oscillation of the copier with the product, which improves the quality of welding. The presence in the proposed device of one drive, which provides rotation and movement of the part during welding, makes it possible to stabilize the parameters of the welding modes due to the constant speed of movement of the part relative to the electrode of the welding head and, thereby, to improve the quality of the parts. In addition, performing single-drive movement and rotation operations simplifies the kinematics, and hence the design of the device. Securing the rotary shaft on the double-hinged lever allows the part to be freely moved within

lever lengths that expand the range of sizes and shapes of parts to be welded .;

Claims (2)

1. Copyright certificate of the USSR № 375145, cl. 23 K 37/04, 1971. 2. USSR author's certificate No. 298452, cl. In 23 K 37/04, 1970. V Phases /