CN112411221A - Method for manufacturing filling type compacted strand steel wire rope - Google Patents

Abstract

A method of making a filled compacted strand steel cord comprising: the lay length multiple of the outer strand of the steel wire rope is controlled to be 7.6-7.8, the stress of the outer strand is controlled to be + 45-90 degrees, namely the rotation direction is the same as the lay direction of the strand; the diameter ratio of the outer strand outer layer filaments to the first layer filaments is 0.94-0.95; the strength level of the filling wire is reduced by 2-3 levels to reduce the rebound stress and promote more stable forming. The invention achieves the purposes of solving the problem that the filling yarns are not exposed in the production process and improving the quality of the filling type compacted strand steel wire rope by comprehensive measures of reducing the lay length multiple of the strand, reducing the strength level of the filling yarns, increasing the diameter of the outer layer yarns and the like.

Description

Method for manufacturing filling type compacted strand steel wire rope

Technical Field

The invention relates to the technical field of metal products, in particular to a production method of a filling type compacted strand steel wire rope.

Background

The problem of the exposed filling wire is very easy to occur in the production process of the K25Fi and K29Fi compacted strands, and particularly in the process of rope combination, the filling wire is extruded out through a pre-former and cannot return to the original position, so that the quality of the steel wire rope is influenced.

The steel wire rope has higher requirements on process wire matching, strand stress control, process equipment and the like. When stranding, if the strand stress is not controlled in place, the problem of exposed filling wires occurs during stranding, and the product is seriously scrapped.

Disclosure of Invention

The invention aims to solve the technical problems that in the process of combining a filling type compacted strand steel wire rope, filling wires are extruded out through a pre-former, cannot return to the original position and the quality of the steel wire rope is influenced.

In order to solve the technical problems, the invention adopts the following technical scheme:

a method of making a filled compacted strand steel cord comprising:

the lay length multiple of the outer strand of the steel wire rope is controlled to be 7.6-7.8, the stress of the outer strand is controlled to be + 45-90 degrees, namely the rotation direction is the same as the lay direction of the strand;

the diameter ratio of the outer strand outer layer filaments to the first layer filaments is 0.94-0.95;

the strength level of the filling wire is reduced by 2-3 levels to reduce the rebound stress and promote more stable forming.

The beneficial effect of adopting above-mentioned technical scheme is:

the invention achieves the purposes of solving the problem that the filling yarns are not exposed in the production process and improving the quality of the filling type compacted strand steel wire rope by comprehensive measures of reducing the lay length multiple of the strand, reducing the strength level of the filling yarns, increasing the diameter of the outer layer yarns and the like.

Drawings

FIG. 1 is a schematic structural diagram of a "6 XK25 Fi-phi 28 mm" steel wire rope according to an embodiment of the invention.

In the figure: 1-central filament, 2-first layer filament, 3-filling filament and 4-outer strand outer layer filament.

Detailed Description

A method for manufacturing a filled compacted strand steel cord comprises,

the lay length multiple of the outer strand of the steel wire rope is controlled to be 7.6-7.8, the stress of the outer strand is controlled to be + 45-90 degrees, namely the rotation direction is the same as the lay direction of the strand;

the diameter ratio of the outer strand outer layer filaments 4 to the first layer filaments 2 is 0.94-0.95;

the strength level of the filling wire 3 is reduced by 2-3 levels to reduce the rebound stress and promote more stable forming.

Example one

As shown in fig. 1, the present embodiment further details the production process of the "6 XK25Fi- Φ 28 mm" compacted strand steel cord:

the lay length multiple of the outer strand is controlled within the range of 7.6-7.8.

The outer strand silk matching process comprises the following steps from inside to outside: the diameter of the central wire 1 is 2.20 mm, and the strength grade is 1770K; the diameter of the first layer of wires 2 is 2.03 mm, and the strength level is 1770K; the diameter of the filling wire 3 is 0.86 mm, and the strength grade is 1570K; the outer strand sheath 3 has a diameter of 1.92 mm and a strength grade of 1770K.

The deformer is 150mm after strand twisting, the strand stress is controlled between +45 degrees and +90 degrees (the rotation direction is the same as the strand twisting direction) by dividing into a horizontal group and a vertical group.

The rope is closed by a disc-type pre-deformer, the diameter of a working roller of the pre-deformer is 35mm, and the natural closed angle is 23 degrees.

The pre-former parameters were: the roll end spacing was 85% T (T is the actual lay length of the rope) and the reduction was 1.3D (D is the nominal wire rope diameter).

The strand breaking deformation rate is 86-89%, and the steel wire rope is not loosened when being twisted, so that the process requirements are met.

The strength grades of the steel wire ropes are generally 1570, 1670, 1770, 1870 and 1960 MPa.

The filler wire 3 is a raw material steel wire used before the combination of the filled compact strand steel wire rope, is a steel wire for rope manufacturing formed by drawing a wire rod (wire rod), and is formed by selecting the wire rod (wire rod) with specific steel grade/carbon content, formulating a drawing route and cold drawing on a wire drawing machine. The "reducing the strength level of the filler wire 3 by 2 to 3 levels" means that, compared with the filled compacted strand steel wire rope, for example: if the filled compacted strand steel wire rope is in the strength level of 1870MPa, the filling wire is in the strength level of 1570-1770 MPa.

Claims (1)

1. A method for manufacturing a filling type compacted strand steel wire rope is characterized by comprising the following steps: the manufacturing method comprises the steps of preparing a substrate,

the lay length multiple of the outer strand of the steel wire rope is controlled to be 7.6-7.8, the stress of the outer strand is controlled to be + 45-90 degrees, namely the rotation direction is the same as the lay direction of the strand;

the diameter ratio of the outer strand outer layer wire (4) to the first layer wire (2) is 0.94-0.95;

the strength level of the filling wire (3) is reduced by 2-3 levels to reduce the rebound stress and promote more stable forming.

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