SU806315A1 - Method of removing burrs after contact working of mainly with the aid of air-arc cutting - Google Patents

Description

one

The invention relates to welding, and more specifically to the air-arc cutting of metal and can be used when removing burrs from stacks of rods (strips) welded by resistance welding.

The known method is implemented using an air-arc cutter consisting of a holder, a non-consumable electrode, between the end of which and the workpiece is excited an electric arc, and the nozzles, which supply the molten metal 1 to the arc zone.

However, in the case of using such a cutter to remove burrs nq after butt welding of rods (strips), the electrode must be conveyed in three directions — along its axis, along the butt perimeter and parallel to the longitudinal axis of the rod. The complex trajectory of movement and the intense combustion of the electrode make it difficult to automate the deburring process. In cases where the burring is unacceptable for technological reasons, for example, when bending the rings of rods, which are expanded by resistance welding into a continuous whip, it is removed by a manual air-arc cutter with the technological line stopped during this operation.

There is also known a method implemented using a device in which rotating disk electrodes are placed in a plane perpendicular to the surface of the workpiece, displaced one relative to another along

0 the longitudinal axis of the workpiece, and the ends of the electrodes are processed according to the shape of the workpiece 2.

However, in this method, the electrode has a complex trajectory of movement. 5. A large power source of the arc power supply is required and the electrode is not sufficiently stable.

The purpose of the invention is to reduce the power of the arc power source and increase the resistance of the electrode.

The goal is achieved by placing the electrodes at an acute angle to the longitudinal axis of the workpiece.

five

Figure 1 presents the installation, General view; figure 2 - section aa in figure 1; on fig.Z - section BB in figure 1; figure 4 - section bb

30 figure 1; Fig. 3 is a schematic diagram implementing the proposed method; Fig. 6, section A-A in Fig. 5.

The method is carried out as follows.

Two or more non-melting flat electrodes 1 are taken, the working ends of which are processed along the line of intersection of their installation planes with the surface of the rod (strip) 2, from which the burr 3 must be removed, and cover the entire perimeter of the rod section (Figures 2 and 3). Between the working edges of the electrodes and the surface of the rod there is an eaor into which through the nozzles 4 (figures 1 and 4). parallel to the surface of the rod, compressed air is supplied. The electrodes are displaced one distance relative to each other along the axis of the rod so that they come into contact with the flash sequentially and are placed in planes perpendicular to the surface of the rod being processed at an acute angle to its longitudinal axis. Electrodes and nozzles for supplying compressed air are fixed on a copying device 5 (FIG. 1), centered along the longitudinal axis of the rod being machined.

In the deburring process, the electrode 1 and the rod 2, from which it is necessary to remove the burr 3, are connected to the zolus of the welding current source. In the gap between the electrode and the rod podgiot compressed air and the rod (or electrode) reported translational motion in the direction of the longitudinal axis of the rod. When the side surface of the electrode 1 touches the gas 3, the electrical circuit closes and automatically energizes the arc (Fig.6). The burr is dispersed by the heat of the arc and is continuously removed by a stream of compressed air. This process continues until all the burr is removed from the joint area covered by the electrode, after which the electrical circuit is automatically opened. The process automatically repeats as the grata passes under the second electrode.

and in the case of processing rods with a large cross section under the third, fourth, etc. electrodes.

Work in the automatic mode ensures the removal of burr without stopping the technological line for welding rods, eliminates manual labor in this operation, which creates a corresponding economic effect.

Under the action of an electric arc, the electrodes are worn out and their thickness is chosen so as to ensure continuous operation during one or several work shifts without changeover.

The location of the electrodes at an acute angle to the longitudinal axis of the treated rod increases their service life, as the active spot of the arc on the electrode moves continuously as the flash melts and the heating of the electrode decreases. The choice of the angle of the electrodes also regulates the amount of current consumed and the rate of deburring.

Claims (2)

1. Khrenov K.K., Welding, brazing and cutting of metals. Meoigiz, 1970, p. 392. 2. USSR author's certificate No. 359113, cl. In 23 K 11/22, 18.01.71 (prototype). Eworking aowKtHua rod G Tj jKamtfu S1katy8o) 9uh Direct movement rods Bite arc