RU2546936C2 - Method of processing mating surfaces of shutoff device and device for its implementation - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention refers to machine building and can be used in manufacturing of shutoff devices, for example, for oil and gas main lines. Method of processing the mating surfaces of a shutoff device made as a gate set between cheeks involves processing of the gate in operating position by low-voltage AC pulses in the air environment with the reciprocating motion of the gate in respect to the cheeks and the vibration of the cheeks in respect to the gate, maximal amplitudes of the ac pulses are matched with the encounter period of the said mating surfaces and processing is carried out until steady current value is achieved. The device for processing the mating surfaces of the said shutoff device comprises a drive to move the gate between the cheeks which are spring-loaded by resilient elements, and electromagnets made so that they can be rigidly fixed on the shutoff device body on the outer side of the cheeks and are connected to a pulse synchronizer connected to a low-voltage AC source.

EFFECT: invention provides for leaktight joint at the elimination of irregularities on the surface of mating parts of a shutoff device made as a gate set between cheeks at its manufacturing and at its restoration without being demounted from a product.

2 cl, 1 dwg, 1 ex

Description

The invention relates to the field of engineering and can be used in the manufacture of locking devices, for example, for oil and gas pipelines.

The known method [1] of non-abrasive stripping of parts with the rough side of the chip during the turning process. The disadvantage of this method is the low accuracy of processing of mating surfaces, the appearance of burrs on the edges of the contact areas, the possibility of finishing processing of mating parts only on the equipment after disassembling the nodes.

The known method [2], p. 222, non-abrasive polishing with dielectric lapping and a metal cathode-tool, allowing to obtain high purity of each of the mating elements.

The disadvantage of this method is the low accuracy of the mating surfaces and the need to disassemble the nodes for processing the mating parts.

A known method and device [3], p. 416, for grinding the mating surfaces using an abrasive.

The disadvantages of the method and device include the mating of mating surfaces, which causes a malfunction of the mating parts, the appearance of burrs on the edges, the possibility of grinding the mating parts only after disassembling the assembly, which violates the accuracy of the mating and increases the complexity of the grinding operation.

As a prototype we accept [3].

The proposed method and device guarantee the absence on the mating surfaces of abrasive particles, burrs, allow the processing of mating surfaces and their restoration without reassembling the nodes, which increases the accuracy of mating.

The method of processing the mating surfaces of the locking device in the form of a gate located between the cheeks includes processing the gate in the working position with low-voltage AC pulses in the air with reciprocating movement of the gate relative to the cheeks and vibration of the cheeks relative to the gate, while the largest amplitudes of the alternating current pulses are combined with the approach period the said mating surfaces and the processing are carried out until a stable current value is reached. A device for processing the mating surfaces of the locking device in the form of a gate located between the cheeks, which contains a drive for moving the gate between the cheeks, which are spring loaded with elastic elements, and electromagnets that can be fixedly mounted on the housing of the locking device from the outside of the cheeks and connected to a pulse synchronizer, connected to a low voltage AC source.

In FIG. 1 shows a diagram of a device and the interaction of its elements in the description of the method.

The gate 1 is located between the cheeks 2 and 3, which have a hole 4 in common with the gate 1 for passing a liquid or gas medium. The gate 1 has the ability to move between the cheeks 2 and 3 from the drive 5. To ensure tightness between the gate 1 and the cheeks 2; 3 by removing irregularities from the surface of the mating parts, the cheeks 2 and 3 are spring-loaded with elastic elements 6 and 7. In the housing 8 of the locking device from the outside of the cheeks 2; 3, electromagnets 9 and 10 are fixed with a gap, connected to a synchronizer 11, to which current is supplied from a low-voltage source of alternating current 12.

The method is as follows: without bulkhead locking device drive 5 move the gate 1 in the cheeks 2; 3 to the extreme position (in Fig. 1, the position is "open"). From a low-voltage direct current source 12, current is supplied to the synchronizer 11, from where it is supplied to the electromagnets 9; 10 installed in the housing 8 with the possibility of fixed mounting on the housing 8 of the locking device from the outside of the cheeks 2 and 3, with a phase displacement of the current so that when the cheeks vibrate, the direction of movement of the cheeks 2; 3 was in one direction relative to the gate 1. At the same time, the drive 5 moves the gate 1 between the cheeks 2 and 3 to the extreme operating positions (“open”, “closed”) with the maximum speed permissible during operation of the locking device. The elastic elements 6 and 7 act on the cheeks 2 and 3 with the aim of pressing them to the gate 1. The current from the synchronizer 11 enters the cheeks 2; 3 and the gate 1 so that the current pulse on one of the cheeks 2; 3 and the gate 1 was combined with the movement of this cheek under the action of the magnet to the gate 1, when, when this cheek approaches the gate 1, current pulses occur, which are combined with the period of approach of the mating surfaces of the gate 1, cheeks 2 and 3, causing local removal of material from the mating surfaces . When the cheeks 2 and 3 come into contact with the gate 1 during vibration, a current passes through them, the value of which depends on the contact area between the cheek and gate 1. The largest amplitudes of the current pulses are combined with the convergence of the mating surfaces of the gate 1 and the cheeks 2 and 3. After removal of irregularities on gate 1 and cheeks 2; 3, the current at the contacts of the gate 1 and the cheek 2 becomes the same with the current through the gate 1 and the cheek 3 and has a stable value. After that, the magnets are removed, control the resistance to the movement of the gate 1 in the cheeks 2; 3, the tightness of the mating surfaces of the gate 1 and cheeks 2; 3. The method allows to ensure the tightness of the connection during the manufacturing and restoration of the locking device without removing it from the product.

An example implementation of the method. The gate and cheeks made of steel 12X13 with a circular hole with a diameter of 150 mm must be treated on each mating surface with an area of 80,000 mm ² with an error of not more than 0.005 mm. The thickness of the gate is 52 mm, the speed of movement of the gate between the cheeks is up to 50 mm / s. The magnets are installed in the housing on the clamps, after which they are connected to an AC source with a frequency of 5 Hz and a voltage of 8 V. The current flowing to the cheek pressed to the gate is 80 A. Turn on the movement of the gate along the cheeks. After 40 seconds of processing, the current increased to 87 A and stabilized. The removal of metal from the gate amounted to 0.29 mm, from each cheek - 0.15 mm. Inspection of the gate and cheeks did not reveal abrasive particles and burrs in the mating zone, and tests for resistance to movement of the gate in the cheeks and tightness at a pressure of 40 MPa showed that the locking device meets operational requirements.

Information sources

1. RF patent 2243064.

2. Advanced engineering technologies. / Ed. A.V. Kirichika. M .: Publishing house "Spectrum". Volume 1. 2012 - 334 p.

3. Handbook of electrochemical and electrophysical processing methods. / Ed. V.L. Hairy. L .: Engineering, Leningrad branch, 1988 - 719 p.

Claims (2)

1. The method of processing the mating surfaces of the locking device, made in the form of a gate located between the cheeks, comprising processing the gate in the working position with low-voltage AC pulses in the air with reciprocating movement of the gate relative to the cheeks and vibration of the cheeks relative to the gate, with the largest amplitude of the alternating pulses the current is combined with the approximation period of said mating surfaces and the processing is carried out until a stable current value is reached. 2. A device for processing the mating surfaces of the locking device, made in the form of a gate located between the cheeks, containing a drive for moving the gate between the cheeks, which are spring loaded with elastic elements, and electromagnets made with the possibility of fixed fastening on the housing of the locking device from the outside of the cheeks and connected to pulse synchronizer connected to a low voltage AC source.

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