The surface roughness of the traction roll has a significant effect on the quality of the brace.
If the surface roughness of the traction roll is large:
1. Increased friction: It may lead to excessive tension in the traction process, which is easy to cause tensile deformation or even fracture.
2. Surface damage: It will leave scratches or indentations on the surface of the brace, affecting the surface finish and appearance quality of the brace.
Conversely, if the surface roughness of the traction roll is small:
1. Insufficient friction: It may lead to insufficient traction force, and the pull can not advance smoothly and evenly, which is prone to problems such as jitter and offset, so that the dimensional accuracy of the pull is reduced.
2. Slip phenomenon: can not effectively pull the brace, affecting production efficiency and product quality stability.
For example, in the production of high-precision plastic brace, small changes in the surface roughness of the traction roll may cause the diameter deviation of the brace to exceed the allowable range, thus affecting the performance of the product.
The following methods are usually used to measure and evaluate the surface roughness of traction rollers:
1. Touch stitch
Using a stylus profiler, the stylus moves across the surface of the traction roll, and the surface profile data is obtained by measuring the vertical displacement of the stylus, and then the parameters of the surface roughness, such as Ra (arithmetic mean roughness) and Rz (maximum height of the profile), are calculated.
2. Optical method
For example, laser interferometers or optical profilometers use the principle of light interference or reflection to measure the surface profile and thus evaluate the surface roughness.
3. Comparison sample method
The surface of the traction roll is compared directly with the standard sample with known roughness grade, and the rough roughness range is estimated by visual and tactile methods.
When evaluating the surface roughness of the traction roll, the following aspects need to be considered comprehensively:
1. Select an appropriate measurement position
Multiple measurements are made at different parts of the traction roll to obtain comprehensive and accurate roughness data.
2. Selection of measurement parameters
According to the specific application requirements and industry standards, the appropriate roughness parameters are selected for evaluation, such as Ra, which is often used to describe the general surface roughness.
3. Repeatability and accuracy
Make multiple measurements to ensure good repeatability and accuracy of the measurement results.
