RU2147324C1 - Gear for microarc oxidation of body wells of gear-type pump - Google Patents

Abstract

FIELD: deposition of oxide coats on aluminum alloys during repair of bodies of gear- type pumps. SUBSTANCE: gear for microarc oxidation of body wells of gear-type pump has electrode, bath-electrolyzer, power supply source, tank for collection of electrolyte, system of electrolyte pumping through. Case of bath-electrolyzer is connected to first terminal of power supply source and electrode manufactured in the form of two hollow cylinders linked by strap and installed in wells of body of gear- type pump is linked to its second terminal. Clearance between external surface of electrode and surface of body wells lies in interval of 5.0-12.0 mm. EFFECT: increased quality of deposited coat thanks to optimization of structural elements of gear. 2 dwg

Description

 The invention relates to a device for producing oxide coatings on aluminum alloys in the repair of gear pump housings.

 In the repair industry, local deposition of alloys with a fixed electrode is known. The hole in the body part is sealed from below, the electrolyte is poured into it, the anode is installed and connected to a current source. The hole itself serves as a bath. This method is often used to restore bearings under bearings in housing parts [1].

 This device does not provide intensive mixing of the electrolyte and replenishment with new enriched portions of the desired concentration, which affects the quality of the resulting coatings.

 A device for coating on the surface of continuously moving long products by electrodeposition from a polymer solution, containing a dousing head as an electrode and a solution circulation system, the dousing head is made in the form of a tank, the configuration of the side surface of which corresponds to the configuration of the side surface of the workpiece moving along the longitudinal axis containers, and its inlet and outlet have gaskets made of an elastic dielectric [2].

 However, the device does not allow to restore the wells of gear pump housings.

 A device is known for restoring wells of pump housings by electroplating with an alloy of zinc — iron or zinc — nickel. The device has two electrodes of a special design. Each electrode consists of a cylinder with a spiral sector. In the spiral sector there are grooves used to supply fresh electrolyte to the tampon [3].

 However, the resulting coatings do not provide high wear resistance of the restored surface.

 Closest to the proposed device in technical essence and the achieved result is a device for microarc oxidation of valve metals and their alloys, containing a power source, an electrolyte bath, the casing of which is connected to the first terminal of the power source through a shunt of electrical resistance, and a current lead for the part connected to the second terminal of the power source, it is equipped with a second bath for electrolyte, a second shunt of electrical resistance and a second capacitor, two electronic keys, two synchronization units, a pulse shaper and a current lead for the second oxidizable part, the bath body through the second shunt connected to the body of the second bath, the second terminal of the shunt connected to one terminal of the first electronic key, the second terminal of which is connected to the first capacitor lining, and the current lead of the second the oxidizable part through a series-connected second electronic switch and a second capacitor is connected to the second capacitor plate, which is connected to the first terminal of the power source, when We eat the first synchronization block connected in parallel to the shunt, the control output of the synchronization block is connected to the controlled input of the first electronic key, the second synchronization block is connected in parallel to the additional shunt, and its control output is connected to the control input of the second electronic key, while both synchronization blocks are connected to the driver pulses connected to the terminals of the power source [4].

 However, this device does not allow to restore the wells of gear pump housings.

 The objective of the invention is to improve the quality of the resulting coating by optimizing the structural elements of the device.

 This goal is achieved by the fact that in the device for microarc oxidation of wells of the gear pump housing, containing an electrode, an electrolysis bath, a power source, an electrolyte collection tank, an electrolyte pumping system, the electrolyzer bath body is connected to the first terminal of the power source, and the electrode connected to its second terminal, according to the invention, the electrode is made in the form of two hollow cylinders connected by a jumper and installed in the wells of the gear pump housing, which are simultaneously a bath electrolyzer, in addition, the gap between the outer surface of the electrode and the surface of the wells of the housing is in the range of 5 - 12 mm

 The proposed device provides high quality coatings.

 If the gap between the outer surface of the electrode and the surface of the pump housing is less than 5 mm, a short circuit may occur, which is unacceptable.

 With a gap of more than 12 mm between the outer surface of the electrode and the surface of the pump casing, the process productivity is significantly reduced and energy consumption increases, which is undesirable.

The invention is illustrated by drawings where:
In FIG. 1 shows the proposed device, a General view.

 In FIG. 2 is a section A-A in FIG.

 A device for microarc oxidation of wells of a gear pump housing comprises a gear pump housing 1, a support plate 2 made of textolite, in which cylindrical electrodes 3 are installed, made with a jumper. The device also contains a tank for collecting electrolyte 4 and a booster system 5. The electrodes 3 are installed in the fluoroplastic thrust bearings 6. The gear pump housing 1 and the electrodes 3 are connected to an alternating current source.

 A device for microarc oxidation of wells of a gear pump housing works as follows.

The booster pump is turned on, after which an electrolyte of the following composition is fed through the piping system from the tank 4 to the cavity of the gear pump housing 1, g / l: KOH - 0.9 ... 1.2; Na ₂ SiO ₃ - 8 ... 15. When the electrolyte begins to overflow through the upper edges of the pump housing 1, the power source is turned on. Microarc discharges are formed between the electrodes and the surface of the wells. The duration of the process is 120 minutes, after which a durable wear-resistant coating with a thickness of 100 μm is formed on the surface of the wells of the pump casing.

 The use of the proposed device for microarc oxidation is advisable not only when restoring worn gear pump housings, but also when hardening new ones.

Sources of information
1. Machine repair / Ed. Telnova N.F. - M .: Agropromizdat, 1992 .-- 560 p., P. 183 ... 185, fig. 2.35).

 2. A.S. 3223468, C 25 D 13/06, publ. in B.I. N 1, 1972.

 3. Novikov A. N. Repair of parts from aluminum and its alloys. Tutorial. - Orel: Oryol State Agricultural Academy, 1997, - 57 p., P. 25.

 4. A.S. 1504292, C 25 D 11/02, publ. in B.I. N 32, 1989 - prototype.

Claims (1)

 A device for microarc oxidation of wells of a gear pump housing, comprising an electrode, an electrolysis bath, a power source, an electrolyte collecting tank, an electrolyte pumping system, the electrolyzer bath housing being connected to a first terminal of a power source, and an electrode connected to its second terminal, characterized the fact that the electrode is made in the form of two hollow cylinders connected by a jumper and installed in the wells of the gear pump housing, which at the same time are a bath-electrolyzer, in addition, the gap between aruzhnoy electrode surface and the surface of the body of wells is in the range 5 - 12 mm.

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