RU2506322C1 - Method of making ring valve split rings - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to machine building, particularly, to production of split rings of hydraulic system ring valves. Ring billet is shaped to cylinder for fitting in valve seat at preset fit. Note here that billet from rolled thin-wall plate of spring steel is used and shaped to cylinder by clamping to mandrel cylindrical recess and quenching in oil. The billet medium-temperature tempering is performed at its setting.

EFFECT: simplified process, lower labor input, longer life.

3 dwg

Description

The invention relates to mechanical engineering and can be used for the manufacture of annular valves for various hydraulic systems (in particular, fuel systems of internal combustion engines), and consisting of a socket (2) with inlet (1) and outlet (6) liquid channels and a locking element in the form of a split ring (3) fixed in the socket with a pin (5) (figa); and working as follows - when pumping (suction, if used as a suction) fluid through the inlet channel (1), the ring (3) under the influence of the flow pressure (vacuum in the valve chamber (4)) rises by the amount (h) (Fig.1b ), forming a sickle-shaped gap, and passes liquid to the outlet channel (6). After the termination of injection (suction), the ring, under the action of its elasticity and fluid pressure in the intra-valve cavity, sits in the socket and closes the channel (1).

As a prototype of a method of manufacturing a split ring annular valve, the method described in the literature [1] was adopted and includes the following operations: rough turning of the outer surface, drilling and rough boring of the inner surface, cutting along the generatrix, pressing and soldering the cut ends to each other, turning outer and inner surfaces to the required size, determined by the diameter of the valve seat and ring thickness, the wiring of the cut ends, heat treatment and subsequent grinding of the seal sculpting surfaces.

The disadvantages of this prototype are:

- large losses of material on the chips and high complexity and energy consumption of manufacturing;

- the complexity, and in some cases the impossibility of making thin-walled (less than 0.3 mm thick) rings;

- the need to use sophisticated equipment - metal-cutting machines and related tools;

- the high cost and lack of durability of the ring.

The objective of the invention is to simplify manufacturing techniques and reduce material costs for the manufacture of rings, as well as increase the durability of its work.

The task is realized in that a thin-walled plate rolled from spring steel is used as a billet, to which a cylindrical shape is imparted by pressing a special mandrel with a clamp on the cylindrical saddle (Fig. 2) and fixation in a given shape by heat treatment, followed by grinding on the socket.

The method is as follows. The initial blank is a plate with a width smaller than the width of the valve seat by about 0.5 ... 0.6 mm, rolled from 65G steel or other spring steel. Its length is determined taking into account the diameter (D) of the socket and the necessary clearance (S) between the edges of the cut ring installed in the socket.

The plate is pressed onto the cylindrical saddle of the special mandrel with a clamp, which ensures the necessary cylindricality of the sealing surface.

The saddle of the mandrel is made in the form of a recess with an inner diameter (D _c ) and an outer one (D _o ), larger than the inner diameter by about the thickness t of the plate, and a width equal to the width of the plate with a small allowance for the installation (about 0.05 mm). The number of mandrel seats is determined by the number of rings produced at the same time.

The mandrel with the plate pressed to the saddle with a clamp is placed in a furnace heated to a temperature of 830 ... 850 ° C, and after holding for 10-15 minutes it is quenched in oil. Then carry out medium temperature vacation.

As a result of this, the plate retains its cylindrical shape.

In order to ensure the necessary tightness of the ring to the socket, their sealing surfaces are mutually rubbed with abrasive paste (for example, GOI) to the 8th grade of cleanliness.

The proposed method makes it technologically simple to produce rings of any diameter (D), width (b), and especially thickness (t) (Fig. 3), moreover, at low energy and material costs. According to calculations with this method, the cost of the ring is 1.7 times less than with the prototype (262.64 rubles. Instead of 443.29 rubles.).

It is also important that this method retains the fibrousity of the material formed during rolling of the plate, i.e. technological heredity, contributing to an increase in the durability of the ring.

As experiments have shown, a valve with a ring made according to the described technology is not inferior in hydraulic density to the fungal valve of diesel fuel systems that has proven itself over many years of operation.

Information sources

1. Bashirov P.M., Galiullin P.P. Regulation of fuel supply in tractor diesels. - Ufa: BGAU, 2008 .-- 184 p.

Claims (1)

A method of manufacturing split sealing rings of annular valves, including giving the preform a cylindrical shape for fit into the valve seat with a predetermined density, characterized in that the preform is used from a rolled thin-walled plate of spring steel, which is cylindrical by pressing with a clamp on the cylindrical recess of the mandrel and quenching in oil , and then carry out medium temperature vacation during its fixation.

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