RU146510U1 - INSTALLATION FOR WELDING OF THE ADDITIVE MATERIAL TO THE SURFACE OF THE WORKED PART OF TWO ROLLER ELECTRODES - Google Patents

Abstract

1. Installation for welding filler material to the surface of the workpiece with two roller electrodes, comprising a mechanism for securing the workpiece, equipped with a drive for rotating the workpiece, a welding head with two roller electrodes for welding the filler material, while both roller electrodes of the welding head are mounted above the surface of the workpiece in the same plane with an offset relative to each other, are located on both sides relative to the longitudinal plane the bones of the installation and are offset relative to the longitudinal plane of the installation by the same distance, a device for pressing roller electrodes to the surface of the workpiece, a welding transformer connected by current leads to roller electrodes, characterized in that the welding head is equipped with two carriages, each of which has its own roller electrode, and a device for adjusting the distance between the roller electrodes. 2. Installation for welding according to claim 1, characterized in that the device for regulating the distance between the roller electrodes is made in the form of a kinematic screw-nut pair, the screw being fixed at the end of the vertical output element, and the nuts are placed in the carriages. 3. Installation for welding according to claim 1, characterized in that the roller electrodes are offset relative to each other with the possibility of placing between them an odd number of weld points from the condition of placing the weld points formed by one roller electrode in the spaces between the weld points formed by another roller electrode.

Description

Technical field

The claimed utility model relates to the technique of electrical contact welding of filler material and can be used in the restoration and hardening of products.

State of the art

Welding materials and welding filler materials using roller electrodes is one of the most common welding methods. The basis of this technology is the implementation of a continuous weld by forming a chain of successive overlapping weld points.

This technology is widely used when welding filler material to the surface of the workpiece to form a layer of material with specified properties, for example, a protective layer, a layer with increased wear resistance, etc. This technology is also used to restore parts.

A known installation for electrical contact welding of filler material, comprising a device for attaching a machined cylindrical part and a welding head mounted on a workpiece with one roller electrode for welding filler material, a device for pressing a roller electrode to a welded wire to press the wire to the surface of the workpiece, welding transformer, to the secondary winding of which a roller electrode and a device for attaching the workpiece are connected details (see RF patent for utility model No. 47275, B23K 11/06 of 08/27/2005). The known installation implements a method of electric contact welding of filler material to the surface of a cylindrical product, in accordance with which the deposited material (wire) is pressed with a roller electrode to the surface of the deposited part, the roller is moved over the surface of the deposited part and at the same time the deposited part is rotated, for example by the same roller electrode, and formed roller (welding seam). In a known technical solution, when welding filler material, the welding current passes through the entire part, and since the distance between the points of supply of the welding current changes all the time, the welding mode of the filler material changes all the time, which affects the quality of welding. In addition, since the welding current flows along the part, this leads to additional unproductive energy consumption and heating of the workpiece.

More advanced is the technology of electric contact welding / surfacing of the welded material using two roller electrodes.

Known installations for electrical welding / surfacing of the weldable material on the surface of the workpiece are cylindrical, containing a base, a device for attaching the workpiece and two welding heads located on opposite sides (diametrically opposite) relative to the workpiece.

Each of the heads is equipped with its own roller electrode and its own drive for pressing the roller electrode to the surface of the workpiece. Welding heads are placed on a common holder located on the side relative to the workpiece (for example, RF patent for the invention No. 2343053, B23K 11/06 from 01/10/2008). The known installation implements a method of electrical contact welding to the surface of a cylindrical product, in accordance with which the welded material is pressed by roller electrodes to the surface of the workpiece, the workpiece is rotated and, at the same time, the roller electrodes are rotated and thereby the roller is moved over the surface of the workpiece. A welding current is applied to the roller electrodes and a traditional welding seam is formed. In this invention, the distance between the welding points is equal to the diameter of the workpiece and does not change when moving the roller electrodes on the surface of the part, which ensures constant welding conditions. With the small dimensions of the part, this technical solution is quite effective from the point of view of unproductive energy consumption. However, with large diameters of the workpiece, unproductive energy costs increase especially when processing large parts, due to the increase in the path of passage of the welding electric current.

These shortcomings lead to a decrease in the efficiency of using this method for electrical contact welding of filler material for parts with a diameter of more than 100 mm.

Thus, there is a need to improve installations for welding filler material to the surface of the workpiece to reduce unproductive energy costs.

Utility Model Essence

The objective of this utility model is to develop an installation for welding filler material to the surface of the workpiece with two roller electrodes, using which it is possible to significantly reduce unproductive energy costs.

To solve this problem, an installation is proposed for welding filler material to the surface of the workpiece with two roller electrodes, comprising a mechanism for fixing the workpiece, equipped with a drive for rotating the workpiece, a welding head with two roller electrodes for welding the filler material, and both roller electrodes of the welding head mounted above the surface of the workpiece in the same plane with an offset relative to each other, a device for When rolling the electrode electrodes to the surface of the workpiece, a welding transformer connected by current leads to the roller electrodes and a unit for setting welding modes to control the installation, configured to determine the length of the annular weld depending on the diameter of the workpiece and the thickness of the material being welded, and to determine the parameters of the welding mode - the duration of the welding pulse, the duration of the pause, and the size of the weld point, so that even lengths of the ring weld fit t he 2k weld points, and to determine the displacement of the roller electrodes relative to each other by an odd number of weld points to spot welds formed one roller electrode, placed in the gaps between the weld points formed by another roller electrode.

Moreover, in the installation, the roller electrodes of the welding head are located on both sides relative to the longitudinal plane of the installation and are offset from the longitudinal plane of the installation by the same distance.

Moreover, in the installation, the welding head is equipped with two carriages, each of which has its own roller electrode, and a device for regulating the distance between the roller electrodes.

The device for controlling the distance between the roller electrodes is made in the form of a kinematic screw-nut pair, the screw being fixed at the end of the vertical output element and the nuts are placed in the carriages

The technical result from the use of the proposed utility model is that when welding filler material, for example, foil or tape, the roller electrodes are located in one plane at a minimum distance between them, determined by the dielectric properties of the medium in which the process of formation of the welding pulse forming the welding point on the deposited surface during the welding process, which makes it possible to make the distance between the contact points of the roller electrodes with the surface of the the workpiece is smaller than the diameter of the workpiece, and thereby reduce unproductive energy costs. The effectiveness of the proposed method increases with increasing diameter of the workpiece. In addition, installation maintenance is simplified, since the welding head and both rollers are located above the workpiece, which simplifies access to the welding head.

Brief Description of Drawings

The proposed utility model is illustrated by drawings. It should be understood that the accompanying drawings are material illustrating the present utility model, and in no way limit the scope of protection of the utility model. In the accompanying drawings, the same elements are denoted by the same positions. It should be understood that in the following figures a utility model is shown schematically without observing the scale in the image of individual elements.

In FIG. 1 schematically shows the installation for welding filler material to the surface of the workpiece in accordance with the proposed utility model.

In FIG. 2 schematically shows a welding head for welding filler material.

In FIG. 3-5 shows a diagram of the formation of a weld, using the proposed installation :, in FIG. 3 shows a layout of roller electrodes relative to the surface of the workpiece; in FIG. 4 shows a scan of portion L in FIG. 3 .; in FIG. 5 shows a diagram of the formation of weld points.

Utility Model Implementation

The following description is provided for a better understanding of the utility model and does not limit the scope of protection of the proposed utility model.

Figures 1 and 2 show the installation for welding filler material and the head used in it with two roller electrodes.

The installation comprises a base 1, a mechanism for fixing the workpiece 2, including two devices 3 and 4 for fixing the workpiece between them. The device 4 for fixing the workpiece is equipped with a drive 5 for rotating the workpiece. The installation comprises a welding head 6 with two roller electrodes 7 and 8 for welding filler material, a device 9 for pressing the roller electrodes to the surface of the workpiece. The installation includes a welding transformer 10, to the output terminals 11 of which are connected using flexible current leads 12, the roller electrodes 7 and 8. The installation contains a block 13 for setting welding modes to control the installation. Both roller electrodes 7 and 8 of the welding head are mounted above the surface of the workpiece. The mode setting unit 13 is configured to determine the length of the annular weld, depending on the diameter of the workpiece and the thickness of the welded material, and to determine the parameters of the welding mode — the duration of the welding pulse, the duration of the pause, and the size of the weld point, so that it fits on the length of the annular weld an even number of 2k welded points, and to determine the offset of the roller electrodes relative to each other by an odd number of welded points, so that the welded points are formed one roller electrode, placed in the gaps between the weld points formed by another roller electrode.

The welding head 6 for welding the filler material to the surface of the workpiece with two roller electrodes contains a device 14 for moving and pressing the roller electrodes, for example a pneumatic actuator, with a vertically moving output element - rod 15, on the free end of which is attached a holder 16 of the mentioned roller electrodes 7 and 8, in this case, the roller electrodes 7 and 8 are installed in the same plane from two sides relative to the rod 15 and there is a gap “a” between them, isolating the roller electrodes 7 and 8 from each other a. The roller electrodes are insulated relative to the holder 16 by spacers 17 and are connected via current leads 10 to the positive and negative terminals 11 of the output winding of the welding transformer 10, respectively.

The roller electrodes of the welding head are offset from the output element, while it is preferable that the roller electrodes are offset by the same distance.

The holder 16 is equipped with two carriages 18, each of which has its own roller electrode, and a device for regulating the distance between the roller electrodes. The device for regulating the distance between the roller electrodes is made in the form of a kinematic screw-nut pair, with the screw 19 attached to the end of the vertical output element, and the nuts 20 placed in the carriages or made directly in the carriages.

In FIG. 3 and 4 show a layout of the roller electrodes relative to the surface of the workpiece and a scan of the circuit.

The workpiece 2 with a diameter D has a cylindrical shape. A layer 21 of a filler material of thickness δ is adjacent to the outer surface of the workpiece 2. In FIG. 1 shows two roller electrodes 7 and 8 of diameter d, pressing the filler material layer 21 to the surface of the workpiece 2. The contact points A and B of the roller electrodes 7 and 8 with the surface of the filler material layer are offset relative to each other by a distance l (measured in the tangential direction along the outer surface of the layer of filler material).

Preferably, said offset l should be minimal. In practice, this offset depends on how close you can set the roller electrodes 7 and 8 relative to each other so as not to get a breakdown of the gap “a” between the electrodes 7 and 8.

In this example, when welding filler material, the workpiece is rotated in the direction shown by the arrow.

Next, with reference to FIG. 5, a procedure for forming a weld will be considered. The explanatory diagrams are used as an example and not to scale. For simplicity, the diagram shows that adjacent weld points do not overlap each other, but in real conditions, the weld points partially overlap each other.

As shown in FIG. 5, the future weld 22 in plan is a chain of weld points 23 (white squares). The total length L of the annular weld 22 is determined from the equation

L = π (D + 2δ)

In the initial position, the roller electrode 7 is at point A, and the roller electrode 8 is at point B. During the welding process, the roller electrodes 7 and 8 are moved along the weld in the direction shown by the arrow. The roller electrode 8 forms a chain of weld points 24 (cross), and the roller electrode 7 forms a chain of weld points 25 (vertical hatching). In accordance with the present invention, each electrode forms its own sequential chain of welded points. Moreover, in such a sequential chain, each subsequent weld point is offset relative to the previous point by a distance equal to the size of the weld point. The presence in the chain of gaps between the weld points makes it possible to place the weld points of one sequential chain in the gaps between the weld points of another sequential chain of weld points. Such a configuration of two successive chains of weld points is ensured if in the weld 5 one roller electrode forms odd weld points (1, 3, 5 and further), and the other roller electrode forms even weld points (2, 4, 6 and further).

Preferably, when setting the dimensions of the weld points, an even number of 2k weld points are placed on the total length L of the weld.

As shown in FIG. 3, between the points A and B of the contact of the roller electrodes, nine weld points are placed. The roller electrode 8 forms its first weld point 24, starting movement along the weld seam 22 from point B. This point will be the first (odd) point of the weld seam 22. The roller electrode 7 forms its first weld point 25, starting the motion along the weld from point A As shown in FIG. 3, this point will be the tenth (even) point of the weld 5. When further moving along the weld, the weld roller 8 will form the odd weld points of the weld 22, and the weld roller 7 will form the even weld points of the weld 22. In this case, the weld points 24 formed by the roller electrode 8 will be placed in the gaps between the weld points 25 formed by the roller electrode 7, thereby obtaining a continuous weld 22.

The proposed installation works as follows.

After fixing the workpiece 1 with a diameter D and a filler material δ fixed on its outer surface with a thickness of δ, the main parameters are introduced into the mode setting unit 18: the diameter D, the thickness of the foil δ, the speed of rotation of the workpiece — ω, the current strength and operating voltage, the roller preload force electrodes 7 and 8, the width of the weld, the dimensions of the treated zone and other parameters necessary to control the installation. The mode setting unit 13 determines the length of the annular seam, and determines the current strength from the known reference dependences, the duration T _{imp- of the} pulse of the welding pulse and T _pauses is the pause time necessary to form a weld point, the dimensions of which provide an even number of 2k weld points along the length L weld. Next, the mode setting unit 13 determines the displacement l of the roller electrodes so that an odd number of weld points are placed at this distance. If there is a need, the roller electrodes 7 and 8 are displaced relative to each other by the calculated displacement value l. After adjusting the parameters, the roller electrodes are pressed to the surface of the foil and the first ring weld is welded. If necessary, adjacent weld points overlap each other.

If it is required to continue welding of the filler material, the roller electrodes 7 and 8 are displaced along the workpiece to the width of the weld and the next ring weld is welded.

Typically, when welding, the foil or tape of filler material is pre-fixed on the surface of the workpiece at discrete points, but it is possible to fix the foil of filler material after fixing the workpiece to the installation, for example, using the same roller electrodes.

As the filler material can be used foil, tape, wire or any sheet materials.

Industrial applicability

The proposed utility model provides a reduction in unproductive energy costs and can be used in any industries where roller contact welding with the formation of a continuous weld is used.

Claims (3)

1. Installation for welding filler material to the surface of the workpiece with two roller electrodes, comprising a mechanism for securing the workpiece, equipped with a drive for rotating the workpiece, a welding head with two roller electrodes for welding the filler material, while both roller electrodes of the welding head are mounted above the surface of the workpiece in the same plane with an offset relative to each other, are located on both sides relative to the longitudinal plane the bones of the installation and are offset relative to the longitudinal plane of the installation by the same distance, a device for pressing roller electrodes to the surface of the workpiece, a welding transformer connected by current leads to roller electrodes, characterized in that the welding head is equipped with two carriages, each of which has its own roller electrode, and a device for adjusting the distance between the roller electrodes. 2. Installation for welding according to claim 1, characterized in that the device for regulating the distance between the roller electrodes is made in the form of a kinematic screw-nut pair, the screw being fixed at the end of the vertical output element, and the nuts are placed in the carriages. 3. Installation for welding according to p. 1, characterized in that the roller electrodes are offset relative to each other with the possibility of placing between them an odd number of weld points from the conditions for placing weld points formed by one roller electrode in the spaces between the weld points formed by another roller electrode .

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