﻿ Harness processing-stranding process

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# Harness processing-stranding process

First, the stranding machine needs to calculate the process parameters of the stranding wire, so as to accurately solve the distortion of the stranding wire itself . Directly, the overhead strands are composed of hard single wires. They do not want to produce large single wire twists, so they can be used When twisted, the single line is bent and deformed, the base circle is twisted, the helix angle is displaced, and the bending deformation is displaced. Second, the twisting machine stranding pitch ratio calculation formula

The pitch ratio of the twisted wire of the twisting machine refers to the ratio of the length of the twisted wire to the diameter of the twisted wire, that is, the pitch is a multiple of the diameter, and the pitch ratio using the length D of the twisted wire is the ratio, which is called the actual pitch as follows Formula: m = h / D = h / where: h—is the pitch length (mm) pitch ratio, expressed in m. The pitch ratio, which is the ratio of the pitch circle diameter, is called the theoretical pitch ratio.

The relationship between the practical pitch and the theoretical pitch is:

m = / D = mD /

First, the smaller the pitch ratio (or alpha angle), the better the flexibility.

Third, the entanglement coefficient

Within a pitch length of a twisted wire, the ratio of the actual length of a single wire (l) to the length of the twisted wire pitch (h) is called the twisting factor (k), and it is a value greater than 1 expressed as: k = l / The h factor: h = lsinα, the interpolation value is substituted into the above formula, that is k = 1 / sinα, which shows that the entanglement coefficient is inversely proportional to the square of the pitch ratio.

Application of stranding factor and pitch ratio of stranding machine

1. Calculation of single wire length in twisted wire

Set the length of the twisted wire L, and the length of each single wire is L (km)

In formula-is the average entanglement coefficient.

The total length of all single wires in the stranded wire is

= Z L (km) where Z- is the total number of strands in a twisted pair;

2, resistance is inversely proportional to the size of the cross-section of the wire, and proportional to the length of the wire.

3, the number of single wires in a twisted layer

The number of single wires in a twisted layer of a stranded wire is also related to the number of single wires in the center layer.

When the center layer is one, the number of single wires in the first layer is 6n

When the center layer is 2-5, the number of single wires in the first layer is: + 6n

4. Fill factor of stranded wire η

Twisted wires made of round single wires have gaps between the single wires, so the actual cross-sectional area of the twisted wires is smaller than that of the round wires of the same diameter. The ratio of the actual area of the twisted wires to the area of the round wires of the same diameter is called the fill factor. (η) Expressed as a percentage

The calculation formula is as follows: η =%

As can be seen from the above formula, the fill factor of a stranded wire is related to the number of layers. The more the number of layers, the smaller the fill factor, and the limit of the fill factor is 3/4, which is 75%.

Calculation of Beamline Outer Diameter

Structure and outer diameter of multi-stranded core

The outer diameter ratio of the twisted wire of the stranding machine (that is, the ratio of the outer diameter of the stranded wire to the outer diameter of the strand or strand) is the product of the outer diameter ratio of the strand and the outer diameter ratio of the stranded wire to the outer diameter of the strand.

The above is the theoretical basis for the calculation and determination of process parameters when the stranding machine is stranded. In actual stranding, Jetosh quickly calculates the process parameters according to the above formulas and methods to ensure the perfection of the stranded wire.

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