In order to achieve the desired cable characteristics, several key parameters need to be considered during the stranding process. These parameters include the stranding pitch, stranding coefficient, and stranding direction. By carefully manipulating these variables, cable manufacturers can produce cables with specific properties tailored for different applications.
First, stranded pitch
The stranding pitch is the distance (h) covered by a single stranded wire when rotating along the stranded axis. The pitch ratio or pitch multiple is the ratio of the pitch to the diameter.
In concentric stranding, the stranded pitch, outer diameter, and unfolded length of a single wire within the pitch are linked together. This relationship can be better understood by referring to the diagram. Regular concentric stranding is a widely used technique in the wire industry, and this relationship is an important aspect of its design and manufacturing process.
The formula for calculating the pitch of twisted wire can be derived from the figure provided. To create a variation of this content, the following could be written: The calculation formula for twisted wire pitch can be determined by studying the given figure.
h=LSinα=πD´tgα
L=
Formula: h: stranded pitch length;
One pitch consists of a single line spread, and its length is referred to as "L."
D ́: outer diameter of the pitch circle, D ́=D-d;
D: Stranded wire outer diameter;
d: single line outer diameter;
The spiral rising angle and measurement of stranding pitch are two important aspects to consider in cable manufacturing. The spiral rising angle refers to the degree at which the cable spirals upwards, while the measurement of stranding pitch determines the distance between the individual strands. Proper consideration of these factors is crucial for ensuring a high-quality and durable cable that can meet the specific needs of its intended application.
There are various measuring tools that can be used to ensure accurate measurement, such as vernier calipers, steel rulers, and tape measures. These tools are essential in many fields where precision is of utmost importance, like engineering, manufacturing, and construction industries. With the use of these measuring tools, professionals can obtain accurate measurements for their projects, ensuring quality and precision in their work. Vernier calipers, steel rulers, and tape measures can measure different materials, shapes, and sizes, making them versatile tools in various applications.
There are different ways to measure certain physical attributes. The measurement method used depends on the type of material being measured and the precision required. Some measurement methods include the direct measurement method, untwisting method, and scratch method. These methods can be used to measure physical attributes such as length, size, and hardness. The direct measurement method involves measuring an object using a ruler or a measuring tape. The untwisting method is used to measure the level of twist in a material, such as a fiber or thread. The scratch method involves using a sharp object to scratch the surface of a material, and observing the resulting scratch to determine the material's hardness. These methods are important in various industries, including textiles, construction, and manufacturing.
3. Stranded pitch ratio
The practical pitch ratio, also known as the pitch ratio, is the ratio between the pitch length of a stranded wire and the outer diameter of its strand. This metric is used to determine the optimal distance between the strands to achieve the desired flexibility, strength, and conductivity of the wire.
m =
The theoretical pitch ratio, also known as the ratio of the pitch diameter of the strand to the pitch of the stranded wire, is a crucial factor when expressing the overall pitch of the stranded wire. The pitch and pitch diameter of the stranded wire are intertwined in this ratio.
m´ = =
Second, the stranding coefficient copper industry
The ratio of the length of a single wire to the length of the stranded pitch within a stranded pitch is known as the twisting coefficient. To calculate this value, one should divide the actual length of a single wire by the length of the stranded pitch.
K =
where K: twisting coefficient;
After straightening out the stranded wire, the length of each individual pitch will determine the overall length of the wire when unfolded.
h: Stranded pitch length.
The stranding rate is a measure that denotes the association between the real length of a single wire and the length of the stranded wire in the stranded wire. This rate portrays the ratio of the variance between the real length of a single wire and the length of the stranded pitch, by the length of the stranded pitch within a pitch. To calculate the stranding rate, use the following formula:
λ = ×100%
where λ: stranding rate;
L: Single line unfolded length;
h: Stranded pitch length.
The concentric stranding wire is twisted in a particular direction, while the multi-layer wire is twisted in the opposite direction. This is done to ensure that the multi-layer wire remains tight and avoids loosening. When the multi-layer wire is subjected to tensile strength, the torque generated by each layer cancels out each other. This prevents the individual wires of each layer from rotating in one direction, thus avoiding the problem of loosening. In addition, twisting the multi-layer wire in the opposite direction generates a component force of the turning torque, which prevents the wire from winding when not tightly wound.
The direction of twisting is classified into two - left and right directions. When it comes to the direction of stranding, manufacturers need to adhere to the product standard that clearly specifies the outermost twisting direction of the strand. Specifically, for the bare copper wire used in power cable, the outermost stranding standard is specified to be in the left direction. Furthermore, for adjacent layers, the twisting direction should be opposite to each other as per the standard.