SU1400829A1 - Arrangement for prewelding assembly of circular joints - Google Patents

Abstract

The invention relates to welding production, in particular to the structures of devices for assembling for welding annular joints, mainly on thin-walled vessels and shells, and can be used in instrument-making, chemical engineering and other industrial structures. The goal is to improve the quality of the assembly for welding of flanged joints. The device contains a clamping unit 1 and a clamping unit 3. Elastic centering elements 5 are mounted on the clamping unit 1, and stops 10 are mounted on the clamping unit. Protrusions 7 are made on the center of the cich elements 5, the ends of which lie in the same plane perpendicular to the axis of the device . Assembled part 14 is installed in clamping unit 1 and centering it with elastic centering elements 5, Counter part 15 is also installed in clamping unit 1 and centered relative to part 14. The pressing unit moves with a power drive towards the clamping unit 1. In this case, the stops, 10 press the flange , parts 14 and 15 to the protrusions 7. Tacking parts 14 and 15. Cp. f-ly, 5 ill. (L

Description

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The invention relates to welding production, in particular, to the design of devices for assembling for welding annular joints, mainly on thin-walled vessels in shells, and can be used in instrument making, chemical engineering and other industries.

The aim of the invention is to improve the quality of the assembly for welding of flanged joints.

Figure 1 presents the scheme of the proposed device; figure 2 - clamping and clamping blocks, cut; in FIG. 3, view A in FIG. 2; figure 4 - section bb in fig.Z; FIG. 3 is a diagram of the centering of parts.

The assembly for welding the annular joints contains a clamping unit 1 mounted on the frame 2, a clamping unit 3 and an actuator 4 of the clamping unit (FIG. 1).

On the clamping unit 1, made in the form of a shell, centering elements 5 (FIG. 2) are installed with a working centering surface 6 formed by the internal surfaces of the elements 5 and protrusions 7, made in the same plane, perpendicular to the axis of the device and the assembled product 8 .

The inner working surface of the centering elements 5 at the entrance has the shape of a cone formed by: inclined planes 9.

, On the clamping unit 3 mounted coaxially with the clamping unit with the possibility of rotation relative to the actuator 4 and having the shape of a shell, the working surface of which repeats the surface of the pressed part of the product, the stops 10 are mounted. With their ends 11 directed to the flange, they form a second, movable plane, with which the assembled parts of the product are compressed in the flanging zone.

The centering elements 5 have triangular grooves 12, which widen to the ends of the centering elements, and counter projections 13 are made on the stops, which engage with the grooves 12 in the centering elements.

The working diameter of the centering surface 6 is established by parts 14 and 15 with a minimum diameter in this batch and is regulated by

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10 15

20 25 30

five

40 - 45

50

55

masonry between the case of the clamping unit 1 and the centering elements 5.

The device works as follows.

Before assembly, the part 14 of the product is loaded into the clamping unit, usually the part of the vessel with limited access from the inside. If the flanging diameter is somewhat larger than the diameter of the working surface 6 of the spring elements, 5, then during loading there is a slight deformation of the spring elements 5 and the shell itself with the flange.

When loading the second part 15 of the product. The part 1 presses against the protrusions 7 of the centering elements 5. Under the action of the pressure block 3 on the bottom of the part 15 (Fig. 1), driven by a power drive 4, the part 15 presses tightly against the part 14.

The tack is performed by briefly igniting the arc. The tacking points are designated equidistant from the centering elements 5 and can be performed both by a manual torch and by an automatic one installed above the device and periodically inserted into the gap between the centering elements 5.

In each case, the assembly device is rotated after tacking to provide tacking in the following position. For this purpose, the clamping and clamping blocks are made to rotate around an axis.

After all tacks have been completed, the clamping unit is retracted from the clamping unit, the part is removed and fed to the next Welding operation.

The welding is carried out on a fixture allowing the product to rotate.

Thus, when placing the flanging in the clamping bak, having a obviously smaller diameter (or equal), the workpiece is deformed to the center at the centering points, and in the places free from the centering elements, swelling occurs before reaching the Kmais radius or in the interval before it (R, - To „„ J.

The second part is inserted into the clamping block by flapping forward and thus deformed with swelling in places free from centering elements, to a radius of either K and Y, the amount of heaving (R. -t,)

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is made by the difference in diameters to which the clamping block is tuned, the actual diameter of the part, as well as the number of elastic elements and their own rigidity. The greatest heaving occurs in places equidistant from the latter. After the parts are squeezed between themselves at the centering point by forces (stop reaction force) and Pp (pressure unit action force evenly distributed on all the stops), the edges are most compressed due to the presence of protrusions on the centering elements in the plane perpendicular to the axis of the assembled product.

Tacks are made at the places of the greatest heaving. After removing the assembled product from the centering unit, its blocks are straightened in the radial direction, however, their alignment is preserved along the tacks produced. The difference in the amount of deformation of the swelled areas of the assembled joint is the smaller, the more places of centering, i.e. the more evenly distributed along the perimeter of the junction of the centering elements.

The use of the proposed device for the assembly of products with flanged joints for I welding allows a 2-fold reduction in the number of defective products in the external (commercial) formation and completely exclude

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to lead a marriage of non-fusion, and weld welds.

Claims (2)

1. A device for assembling for welding annular joints, comprising a frame with a clamping unit mounted rotatably and a clamping unit mounted rotatably and axially moved, and elastic centering elements mounted on the clamping unit, characterized in that improving the quality of the assembly for welding of flanged joints, it is equipped with stops, the number of which corresponds to the number of centering elements, these elements are made in the form the circumference of the clamping unit parallel to the axis of the device and provided with protrusions located in the same plane perpendicular to the axis of the device, and the stops are also made in the form of plates arranged parallel to the axis of the device and mounted on the clamping unit against the respective centering elements with the possibility of their outer surfaces interacting surface mi-specified elements. 2. The device according to claim 1, characterized in that at the ends of the centering elements are cut-outs of a triangular shape, and on the stops there are protrusions corresponding to them in shape. Fig.Z Seats} npvxSamni / J 5-5 72 - / y / 3 F1 / gA MMt