RU2626327C2 - Method of manufacturing roofs of close construction - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: method of making ropes of a closed structure is as follows. The steel core 1 is made in one technological operation with a linear contact of the wires both over the layers and in the layer itself. All layers of the core are made with the same pitch of the web, in one direction with simultaneous deformation with a reduction ratio of the cross-sectional area of the core 8÷12%. On top of the steel core are coils of shaped wires 2 and 3 of different profile and section. Subsequent extraction of the rope with a fixed load, by applying a load in the range (0.35÷0.55) P, where P - aggregate breaking force of a rope, endurance of loading and the subsequent unloading. The cycle is repeated one to five times. Such a drawing mode allows to stabilise the elastoplastic properties, to remove the residual structural elongation.

EFFECT: improving the quality of the rope of a closed structure, increasing the service life, increasing the efficiency when commissioning.

1 dwg

Description

The invention relates to the field of manufacturing technology of ropes of closed construction and is intended to provide optimal performance and, as a result, increase the service life of ropes of closed construction.

A known method of manufacturing non-expanding ropes of closed construction, copyright certificate No. 356327, IPC D07B 3/00, published October 23, 1972. Bull. No. 32, which consists in the fact that previously deformed profile wires are wound onto the core, forming the outer layer, and then the rope is crimped. In order to ensure complete neutralization of the elastic recoil of the profile wires, reduce the additional efforts of drawing the rope and maintain its structural density, after crimping, the rope is subjected to additional alternating bending.

The proposed method for the manufacture of ropes of closed construction, consisting in the fact that preformed wires are wound onto the core with subsequent crimping of the rope in crimping dies and straightening on a straightening device with a small number of rollers, does not help to neutralize internal stresses generated during the twisting of the rope and stabilize the structural density the rope.

A known method of manufacturing ropes of closed construction, copyright certificate No. 642397, IPC D07B 3/00, published 01/15/79. Bull. No. 2. According to the proposed method, improving the quality of the rope is achieved by stabilizing its elastoplastic properties.

The disadvantage of this method is as follows.

The proposed method of drawing the rope by means of fixed loads for 1-2 minutes, followed by the discharge of each load in the mode (0.125-0.25-0.4-0.5) R, where R is the aggregate breaking force, does not contribute to the elimination of internal stresses arising in the process of twisting, residual structural elongation, stabilization of the elastoplastic properties that arise in the manufacture of a rope of closed construction.

A known method of manufacturing a spiral rope with a closed outer layer, copyright certificate No. 261211, IPC D07B 5/10, published September 30, 83. Bull. No. 36, by layer-by-layer winding of wires on the core of the rope, the profile of which upon subsequent compression forms a lock.

The disadvantages of this method are:

- the lack of reliable lock of the layer of wires from eight-shaped or close to this profile wires after plastic compression of the layer, due to the small size of the sections of engagement, touching each other adjacent surfaces of the wires;

- the core of the rope with a point contact of the wires obtained by layering the winding of the wire with subsequent deep plastic crimping has a rather low resource, due to the deep compression of the rope with the point of contact of the wires, as a result of the contact points between the wires and deep plastic crimping, deformations, internal wear and tear increase additional bending stress;

- the structural density of the rope is not ensured due to the stabilization of its elastoplastic properties.

The objective of the invention is the stabilization of elastoplastic properties and the removal of residual structural elongation, improving the quality of the rope, which is achieved by drawing a rope of a closed structure with a plastic core or core made without plastic compression.

The essence of the claimed invention is as follows.

A method of manufacturing ropes of closed construction, in which a steel core is made in one technological operation with a linear touch of the wires both in layers and in the layer itself. All core layers are made with the same twist step, in one direction with simultaneous deformation with a compression ratio of the core cross-sectional area of 8 ÷ 12% or a core made without plastic compression.

On top of the steel core, there are coils of shaped wire of various profiles and cross-sections.

Stabilization of elastoplastic properties, removal of residual structural elongation is achieved by drawing the rope. The rope is drawn by applying a fixed load in the range (0.35 ÷ 0.55) P, where P is the aggregate breaking force of the rope, load holding and subsequent unloading. The cycle repeats up to five times. The number of drawing cycles is determined by the magnitude of the modulus of normal elasticity, which is determined after each drawing cycle with the mandatory subsequent determination of the residual elongation.

This drawing mode allows you to get a rope of a closed structure with stabilized elastoplastic properties, in which the removal of residual structural elongation

The invention is illustrated in FIG. one.

The proposed method of manufacturing ropes of closed construction is as follows. The steel core 1 is made in one technological operation with a linear touch of the wires both in layers and in the layer itself. All core layers are made with the same twist step, in one direction with simultaneous deformation with a compression ratio of the core cross-sectional area of 8 ÷ 12% or without core compression.

On top of the steel core are located midi from shaped wire 2 and 3 of various profiles and cross-sections. Subsequent drawing of the rope with a fixed load, holding time and unloading, the cycle is repeated up to five times, it allows to stabilize the elastoplastic properties, to remove the residual structural elongation.

Thus, the use of the proposed method of manufacturing ropes of closed construction in comparison with known methods can improve the quality of the rope, increase its service life by stabilizing elastoplastic properties and removing residual structural elongation with a higher modulus of normal elasticity, which increases by at least 10%, due to the hood of the rope closed construction.

Claims (1)

A method of manufacturing ropes of closed construction, characterized in that it contains a plastically compressed steel core with a linear touch of wires or contains a steel core without crimping, on the steel core there are made twigs of shaped wire of various sections, stabilization of elastoplastic properties, removal of residual structural elongation is achieved by drawing the rope in the following cycle, application of a fixed load in the range (0.35 ÷ 0.55) of the breaking strength of the rope, load holding and unloading, cycle up to five times.

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