SU1230775A1 - Multielectrode machine for resistance spot welding of box-like structures - Google Patents

Description

The invention relates to welding engineering, in particular to multipoint resistance welding machines.

The purpose of the invention is to provide welding of products (for example, car doors) in hard-to-reach places and improving the quality of welded joints by preventing deformation of the product.

Figure 1 shows the machine, the general Led; figure 2 - diagram of the feed mechanism of the product; on fig.Z - section aa in figure 2; 4 shows the welding clip a general view; on FIG. 3 - view B in FIG. 4 in FIG. 6 - a section V-B in FIG. 4.

The machine contains a base 1, in the upper part of which a beam 2 is fixed, carrying transformers 3, welding pneumatic cylinders 4 and vertical electrodes 5.

In the middle part of the base, P-shaped are mounted: e guides 6, in which carriage 7 is installed, driven by a pneumatic cylinder 8. In the lower right part of the base 1 there is a welding unit consisting of frame 9 with transformers 3 installed on it, and welding staples 10.

The product feed mechanism also consists of U-shaped guides x 6 of the carriage 7, the pneumatic cylinder 8. The carriage 7 is installed in the U-shaped guides 6 on the edge of the wheels 11 connected in pairs by three axes 12. The middle axis 12, unlike the extreme ones, is not rigidly fixed relative to the carriage 7 and can move in the grooves of the two posts 13 of the carriage 7, depending on the position of the carriage in the machine. The pneumatic cylinder 8 is hinged to the guides 6 with its shank. The pneumatic cylinder 8 is rigidly connected to the middle axis 12 of the carriage 7. The guides 6 on the side facing the center of the machine are open to exit the front wheels 11 of the carriage from them and lowering the carriage onto it the bed supports, which is necessary for transmitting the force of clamping the product to be welded to the pneumatic cylinders of the 4 base supports.

The welding bracket 10. is a body fixed with U-shaped strips 14 on a guide 15 inclined at an angle of 0-30-45 to the vertical. Two pneumatic cylinders 16 with electrode holders 17 and a fixed electrode 18 are rigidly fixed on the bracket 10. Movable the electrodes 19 are inserted into the electric holders 17. The guides 15 are bolted to the posts of the frame 9. The bracket body can move along the guide 15 by the size of the gap 5 and rotate relative to it within two gaps B between the limiting bars 20. Under the action iem own weight bracket mouth-g, navlivaets always in the lower position so that the gaps always obespechiyayuts: - between flanged article svari5 Vai and the fixed electrode 18 and S- between the guide 15 and the U-shaped strip 14. A gap of. it is necessary for unhindered covenant Dani to flange the welded product LIA into the space between the movable 19 and the stationary, 18 electrodes.

The device works as follows. five ,

Before starting work in the carriage 7,

being in the initial position, lay the welded product. After turning on the machine, the carriage 7 from the initial position moves to the weld zone. In the initial position of the carriage 7, all its wheels 11 are located in the same plane, determined by the guides 6, which limit the movement of the wheels 11 both downwards and upwards. In this case, the middle axis 12 is located in the lower part of the grooves of the uprights 13 and can move relative to the can. Therefore, the pneumatic cylinder rod 8, the middle axle 12, pushes the carriage 7 towards the end of the guides 6, which are U-shaped profiles. When the front wheels 11 of the carriage 7 exit from the guides 6, the latter begins to descend about the middle axis 12. The lowering path of the carriage 7 is determined by rolling the front wheels 11 of the ends of the guides 6 and the subsequent vertical movement of the front wheels 11

 along the ends of the guides 6. In this case, the middle axle 12, which continues to move forward, causes the carriage 7 to gently fall on the supports of the base 1. The character of this movement of the carriage 7 is determined by the configuration of the grooves in the racks 13. The front wheels 11 of the carriage 7 6 weight of carriage 7, ascending skati0

five

backward sloping part of the grooves of the shoes 13 relative to the middle axis 12

When the carriage 7 is lowered along the above described path onto the supports of the base 1, the front edge of the product to be welded, bent at an angle of 90 to the horizontal plane of the product, comes in (lowered) into the space between the movable 19 and fixed 18 electrodes of the welding brackets. Vertical electrodes 5, which produce welding on the horizontal plane, lower the product. After clamping the product, remove the electrodes of the welding brackets. The rods of the pneumatic cylinders 16, together with the movable electrodes 19, exit the cylinders 16 and abut against the screening of the product to be welded. Since the product being welded is clamped at this time, the rods cannot move further, and the cylinders move in the opposite direction together with the bracket body, which slides along direction 15 at an angle oi 30-45 ° to the vertical, while the stationary electrodes 18 rise and pressed against the product. The movable electrodes 19 slide along the edge of the product. Possible non-perpendicularity of flanging of the product of the axis of the bracket does not result in deformation of the product, as the bracket self-aligns the flanging of the product due to the lateral clearance between the guide rails 20 and the housing. Thus, the bracket is self-. The flanging of the product being welded is carried out in two directions: moving along the guide and turning into pag due to the gaps B, which can be adjusted.

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After this, welding takes place, and all the mechanisms of the magines come to their initial position. After the electrodes are depressed, the welding brackets are lowered under their own weight, sliding along the guides 15. The carriage 7 returns to its original position under the action of pneumatic cylinders 8. When the carriage 7 returns to its original position, the pneumatic cylinder rod 8 t does not have an average axis 12 back. Consequently, moving along the inclined plane of the groove of the uprights 13, lifts the carriage 7 (the wheels of the middle axle from the guides 6 do not go out), into the guides 6 the front wheels 11 additionally lift the carriage 7 and thus bring the lower part of the grooves racks 13 under the middle axis 12. The axis is again fixed relative to the carriage and the latter returns to its original position.

The proposed device makes it possible to combine the functions of driving the welding force and drives of moving the welding brackets to the welding zone while simultaneously aligning the welding brackets around the product, eliminating the need for two drives for each bracket to carry out two movements of the carriage (moving from the initial position to the welding zone and lowering on the base supports ) using one drive, i.e. exclude one carriage drive; increase machine productivity by eliminating the time required for the operation of the drives to move the welding brackets and the drive for lowering the carriage that are not in this design.

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Editor L.Povkhan

Phie W

Compiled by L. Komarova

Tehred O.Gortvay Proofreader A.Ferents

Order 2481/16 Circulation 1001 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

Claims (2)

1. MULTI-ELECTRODE MACHINE FOR CONTACT SPOT WELDING OF BOXED STRUCTURES. comprising transformers mounted on the base and welding brackets connected to them, including movable electrodes connected to a welding pressure actuator, and fixed electrodes, characterized in that, in order to enable welding in difficult to reach places of complex configuration and improve the quality of welded joints by preventing deformation of the product, it is equipped with guides rigidly fixed to the base and inclined at an angle of 30-45 ° with U-shaped slats and placed on both sides of them adjustable restrictive bars parallel to them, and welding brackets are fixed with U-shaped bars with the possibility of movement along the guides and rotation in the plane of the guides between the limit bars. 2. The machine according to claim 1, characterized in that, in order to increase productivity, it is equipped with a mechanism for feeding the product, made in the form of mounted on the basis of U-shaped guides, and installed with the possibility of moving along them and connected with the drive triaxial carriages with two uprights on each side with curly grooves, two extreme axes fixed to the carriage, and the middle axis is placed in the curly groove and connected to the carriage drive rod. SU. „, 1230775’ 1230775 1