SU1754387A1 - Apparatus for resistance seam welding - Google Patents

Abstract

Usage: restoration of friction disks with slots on the side surfaces. The essence of the invention: on the turntable, there are two toothed sectors diametrically opposed to each other. The turntable has a cam I / O mechanism in the engagement of sectors. For running in the weld, the device is provided with a rolling roller. 2 Il.

Description

The invention relates to repair production, in particular, to the restoration of electric contact roller welding of friction disks with slots on the side surfaces.

Electrocontact roller welding units are known for creating permanent joints of thin-walled parts.

However, their design does not allow high-quality and efficient welding of the type of friction disks with slots on the side surfaces.

It is also known device electrocontact roller welding, including the frame, turntable, host and pressure work rolls.

The known device does not provide the ability to weld the friction disks with the splines on the side surfaces with their fixation along the spline part and simultaneous rolling in of the welding row. Because of this, this device does not allow to achieve high quality restoration, since the parts reconstructed on it do not create a stable spline geometry, they have a high level of residual stresses leading to increased distortion. In addition, this device is characterized by low productivity of the welding process due to the lack of mechanisms for combining the operations of fixing the discs with their welding and processing of the welding row.

The purpose of the invention is to improve the quality when restoring the friction disks with slots on the side surfaces.

The goal is achieved by the fact that the rotary table is equipped with a pair of fixing disks of the toothed sectors diametrically opposed to each other, with a cam I / O mechanism for engaging the sectors, and the device is additionally equipped with rollers for running the welding row.

Figure 1 is a diagram of a device for welding disks; figure 2 - scheme of fixation of the disks during welding.

The electrocontact roller welding device (Fig. 1) contains a rotary table 1 provided with a pair of fixing disks of the toothed sectors 3 that are diametrically opposed to each other and turn together with the table during the welding process. Sectors have a tooth profile corresponding to the full profile

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unworn slotted discs (FIG. 2). Due to this sector performance, the profile of the splines of the repaired discs corresponds to the profile of new discs, since the wear of the teeth extends only to 2/3 of the teeth height and the remaining unworn part of the teeth serves as the mounting base for the gear sectors 3. Fixing is required only in the initial period of welding, therefore turning the table has a cam mechanism 4 for inputting the sectors with the discs before welding and forcing them out of the engagement during the welding process after turning the table through 60 °, which allows reducing the electric power costs by about era tio welding. The turntable also includes rollers 2 running in the seam with a force equal to 1/3 of the compressive strength of welding rollers 5 m 6.

It is the specified amount of running force that reduces the residual welding voltages to the optimum level and does not prevent the welded discs 7 from turning on the turntable 1. The rotation is performed by having sufficient frictional force between the welding rollers 5 and 6 and the disks 7. The movement mechanism 8 serves for setting the rotary table 1 relative to the welding rollers 5 and 6 upon receipt of a two-row welding seam.

A batch of 300 steel driven clutch discs of K-700 tractors was restored on the electro-contact roller welding device. The disks had wear of the friction surfaces, the spline part, and box-shaped defects. The wear values exceeded the allowable for the creation of repair dimensions and the discs were subject to rejection. In the recovery process, the discs were pre-polished on both sides to remove signs of wear to the size of 1.7 mm. Then they were installed in pairs on the turntable of the device so that the worn sides of the splines of one disk were opposite to the unworn sides of the other, and fixed by means of two toothed sectors mounted diametrically opposite to each other. In this case, the toothed sectors, whose profile corresponded to the profile of the unworn slots, were introduced into engagement with both disks by means of a cam mechanism, which

provided the recovered disks with the required geometry of the slotted part. The device was mounted on the installation of resistance welding MSh3201. Then the disks were boiled with a point seam with a chess

location of weld points. For this, after the completion of welding of one row, the installation was turned off and the rotary table was driven by the mechanism for moving to the second position, and boiled by the second row of points. The gear sectors were in engagement with the discs when the first row was welded during the rotation period of 60 °, after bringing the cam mechanism out of engagement, thereby reducing the cost of electricity. Simultaneously with welding, each weld was rolled in a series of rollers to relieve internal stresses.

Welded discs were polished to a nominal size, washed, dried and demagnetized. Chemical-thermal treatment according to the known technology was carried out to ensure the required level of physical and mechanical properties.

The proposed device allows

perform high quality .- and productive restoration of the "V, KOB friction with slots on the side surfaces. The device is distinguished by reliability, ease of operation and high stability.

Claims (1)

quality recovered on it drives. The invention of the Electrocontact roller welding device, containing a frame, a turntable, a leading and a pinch workers rollers, characterized in that, in order to improve the quality when restoring friction disks with slots on the side surfaces, the turntable is provided with a pair of fixing disks of the toothed sectors, diametrically opposed to each other, a cam-driven I / O mechanism in the engagement of sectors, as well as additional rollers for running in the welding row. Fig 1 fmsato /} Disney