SU1618502A1 - Arrangement for applying powder coating on articles - Google Patents

Description

(21) 4653749/02

(22) 02.22.89

(46) 07.01.91. Bul № 1

(71) The Chelba Institute of Mechanization and Electrification of Agriculture. households

(72) Yu.S.Tarasov and E.A. Khlebnikov (53) 621.762.073 (088.8) (56) USSR Copyright Certificate U-1084116, cl. B 22 F 7/04, 1983.

USSR author's certificate number 109533, cl. B 22 F 7/04, 1957.

(54) DEVICE FOR APPLYING POWDER COATINGS ON THE PRODUCT, (57) The invention relates to powder metallurgy and can be used as a device for coating. The purpose of the invention is to improve the quality of the applied coating and reduce the wear of the roller tool. The roller tool 4, mounted in the rod 3, is applied to the surface of the part 6 and is compressed with a force of 100-120 N / mm. At the same time, the axis of application of the biasing pressure does not coincide with the axis of the roller-tool by the value O, 1D (where D is the diameter of the roller-tool). Powder is switched on to the tool contact area with the part and at the same time heating is effected by applying current through the current leads 5. The process of heating, rolling and sintering a layer of powder to the part along a helix occurs. 2 ill., 1 tab.

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Detail

FIG. one

The invention relates to powder metallurgy, in particular to a device. you for powder metal coatings, for example, when replacing worn surfaces of parts.

The purpose of the invention is to improve the quality of the applied coating and reduce the wear of the roller tool.

FIG. Figures 1 and 2 show the proposed device for applying metal powder coatings on the cylindrical surface of the necks of the rotor shaft of a turbo compensator.

The device can be mounted on the basis of a 1K62 type screw-cutting lathe and consists of body 1, made in the form of a hollow cylinder with an outer 50 mm and internal 41 mm diameters, the body length 112 mm chosen taking into account that the body. mounted in the tool holder for the protrusion. Insulating strips 2 are located between the surface of the body protrusion and the tool holder. In case 1, a hollow rod, 3 with a diameter of 40 mm and an inner diameter of 30 mm, is inserted with a 1 mm gap. One end of the rod is made in the form of a fork, the length of the cheeks of the fork is 110 mm, the distance between the cheeks of the fork is 20. mm. On the cheeks forks made of two holes each. One pair of holes is made coaxially under the axis of the roller tool 4 with a diameter of 25 mm. The axis of this hole is located 2013 mm below the stem axis. The other pair of holes is designed for fastening the current leads 5, the Roller-tool 6 is made of copper or its alloys, freely rotating on the axis 4. The outer diameter of the roller is 200 mm selected with regard to the configuration of the restored part. The roller bore hole on the axis f is 25 mm, the width of the tool roller is 2 3 mm. Inside the hollow rod of the cylinder there is a gland element in the form of a spring 7, which rests at one end against the end of the housing 1, and the other at the bottom of the rod 3 from the side where the plug is located. To prevent the stem 3 from falling out of the housing 1, a 1 8 d 10 mm stud is installed. The current leads are fastened to the end of the stem plug with bolts 9.

The device is installed, in the tool holder (not shown) so

so that the axis of the roller tool 4 is at the height of the centers of the machine, i.e. at the axis of the part. Current supply lines 5 are attached to the part and. tool 4 bolts and nuts. The tool roller 4 is driven by the longitudinal movement of the caliper into the surface area to be expanded. The carriage tool 4 is fed laterally by feeding the slide of the caliper to the workpiece and is pressed with a force of 100-120 N / mm of the roller width. The powder feed into the tool-to-work part area is included. Powder is applied to the surface of the part, simultaneously turning the spindle of the machine and turning on the current. The process of heating the rolling and sintering a layer of powder to a part along a helix occurs.

The magnitude of the current is monitored by an ammeter connected to the primary mowing of a step-down transformer or through a current transformer directly. in the secondary winding.

The metal powder is fed in front of the roller tool one turn ahead of its movement and held on the surface of the part by a magnetic field.

During operation, the roller tool 4 is driven by the frictional forces that occur when the workpiece is exposed to a load, and is set to rotate by an angle equal to the angle (lifting the helix of the turns of the applied layer, i.e., operates according to the principle of the vane wheel. the end of the layer application process, the longitudinal feed is first turned off, then the current, and the roller retracted the parts.

The displacement of the roller axis in the vertical plane relative to the axis of the rod, through which the pressing force is transmitted, contributes to the self-alignment of the roller tool to the part at an angle equal to the elevation angle of the helix of the applied coil layer. This helps to improve the quality of the applied layer, since in this case the lateral displacement, the tool roller and its skew are excluded.

The table shows the dependence of the quality of the applied layer and the wear of the roller-tool on the magnitude of the displacement of the roller axis relative to the axis of the rod when the roller diameter is 200 mm.

516

With the use of the self-setting effect, there is no slippage and jump-like movement of the roller, the tool along the expandable surface of the part, there is no rupture of the layer between the turns. In addition, as a result, the wear of the tool roller is reduced. The process of sintering the layer is more stable, there are no external dynamic loads on the tool.

Claims (1)

Apparatus of the Invention A powder coating device for articles containing Known About Gaps between turns. After two turns of 1.5-2 mm. offered 1 5-15 2 3 17-23 24-30 Passes through 6-7 turns of 1.5-1 mm Overlap stability, no gaps. At first, 0.5d parts remain unbaked, and an unbaked surface remains at the end of the process. The overlap between the coils is good 8502 a body, a rod connected to it, a roller tool located in the rod, a current supply, a pressing tool, characterized in that, in order to improve the quality of the applied coating and reduce the wear of the tool roller, the roller tool and the rod are arranged in mutually perpendicular planes x and the axis of the roller tool is located below the axis of the rod by an amount not less than 0.1 of the diameter of the roller. Failures, burrs, heaps of edges Edge smudge, working surface risks Work surface without defects Work surface without defects Detail