Calculation of Stranding Process Parameters of Stranding Machine
2021-04-01
Calculation of stranding process parameters of stranding machine:
1、 The stranding machine needs to calculate the stranding process parameters when stranding, so as to accurately solve the torsion deformation of the single strand itself. Generally speaking, the overhead stranded wire is composed of hard single wire, and it is not expected to produce large single wire torsion. Therefore, the untwisting method can be used to reduce or eliminate the torsion deformation of the single wire itself.
The bending deformation of the single wire is inevitable when the stranding machine is twisting the strands. The larger the base circle is, the larger the helix angle is, the greater the bending deformation is.
2、 Calculation formula of strand pitch ratio of stranding machine
The pitch ratio of the stranded wire of the stranding machine refers to the ratio of the pitch length of the stranded wire to the diameter of the stranded wire, that is, the pitch is a multiple of the diameter, and the pitch ratio is the ratio of the outer diameter of the stranded wire D, which is called the actual pitch ratio, expressed in m. The pitch ratio with pitch diameter as the ratio is called the theoretical pitch ratio. The following formula: m=h/D=h/Where: h - is the pitch length (mm)
The relationship between practical pitch and theoretical pitch is:
m= /D =mD/
In general, the pitch ratio (or α The smaller the angle, the better the softness.
3、 Stranding coefficient
Within a pitch length of the stranded wire, the ratio of the actual length of the single wire (l) to the pitch length of the stranded wire (h) is called the stranding factor (k), which is a value greater than 1 expressed as: k=l/h because: h=lsin α， Substitute this value into the above formula, that is, k=1/sin α， This shows that the twist factor is inversely proportional to the square of the pitch ratio.
4、 Application of stranding coefficient and pitch ratio of stranding machine
1. Calculation of single wire length in stranded wire
Set the length of stranded wire L, and the length of all single wires=L (km)
Where - is the average stranding coefficient.
The total length of all single wires in the strand is=Z L (km)
Where Z - is the total number of strands in one strand;
2. The resistance is inversely proportional to the size of the wire section and directly proportional to the length of the wire.
3. Number of single wires in one layer of stranded wire
The number of single wires in a twisted layer is also related to the number of single wires in the center layer.
When the central layer is 1, the number of single wires in the layer is=6n
When the central layer is 2-5, the number of single lines in the layer is:=+6n
4. Filling factor of stranded wire η
For stranded wire twisted by round single wire, there is a gap between each single wire, so the actual sectional area of stranded wire is smaller than the circular area of stranded wire with the same diameter. The ratio of the actual area of stranded wire to the circular area of stranded wire with the same diameter is called the filling factor（ η） Expressed as a percentage
The calculation formula is as follows: η= %
1、 The stranding machine needs to calculate the stranding process parameters when stranding, so as to accurately solve the torsion deformation of the single strand itself. Generally speaking, the overhead stranded wire is composed of hard single wire, and it is not expected to produce large single wire torsion. Therefore, the untwisting method can be used to reduce or eliminate the torsion deformation of the single wire itself.
The bending deformation of the single wire is inevitable when the stranding machine is twisting the strands. The larger the base circle is, the larger the helix angle is, the greater the bending deformation is.
2、 Calculation formula of strand pitch ratio of stranding machine
The pitch ratio of the stranded wire of the stranding machine refers to the ratio of the pitch length of the stranded wire to the diameter of the stranded wire, that is, the pitch is a multiple of the diameter, and the pitch ratio is the ratio of the outer diameter of the stranded wire D, which is called the actual pitch ratio, expressed in m. The pitch ratio with pitch diameter as the ratio is called the theoretical pitch ratio. The following formula: m=h/D=h/Where: h - is the pitch length (mm)
The relationship between practical pitch and theoretical pitch is:
m= /D =mD/
In general, the pitch ratio (or α The smaller the angle, the better the softness.
3、 Stranding coefficient
Within a pitch length of the stranded wire, the ratio of the actual length of the single wire (l) to the pitch length of the stranded wire (h) is called the stranding factor (k), which is a value greater than 1 expressed as: k=l/h because: h=lsin α， Substitute this value into the above formula, that is, k=1/sin α， This shows that the twist factor is inversely proportional to the square of the pitch ratio.
4、 Application of stranding coefficient and pitch ratio of stranding machine
1. Calculation of single wire length in stranded wire
Set the length of stranded wire L, and the length of all single wires=L (km)
Where - is the average stranding coefficient.
The total length of all single wires in the strand is=Z L (km)
Where Z - is the total number of strands in one strand;
2. The resistance is inversely proportional to the size of the wire section and directly proportional to the length of the wire.
3. Number of single wires in one layer of stranded wire
The number of single wires in a twisted layer is also related to the number of single wires in the center layer.
When the central layer is 1, the number of single wires in the layer is=6n
When the central layer is 2-5, the number of single lines in the layer is:=+6n
4. Filling factor of stranded wire η
For stranded wire twisted by round single wire, there is a gap between each single wire, so the actual sectional area of stranded wire is smaller than the circular area of stranded wire with the same diameter. The ratio of the actual area of stranded wire to the circular area of stranded wire with the same diameter is called the filling factor（ η） Expressed as a percentage
The calculation formula is as follows: η= %
