High quality manufacturing: surface roughness unit parameters
author: Universe plastic
2024-06-25
What is surface roughness
Surface roughness (Surface Roughness) is an important parameter describing the surface smoothness of a part and is usually used to evaluate the processing quality of the overall manufacturing of the product.
Surface roughness has an important impact on the performance, fatigue strength, friction and wear of parts. Therefore, surface roughness is a key quality control indicator in mold manufacturing and injection molding.
Parameters that define surface roughness
Ra: represents the average value of the absolute value of the part surface profile peak deviation from the center line, and is the most commonly used roughness parameter.
Rz: represents the sum of the average heights of the five largest contour peaks and the five smallest contour valleys.
Rt: represents the sum of the heights of the maximum contour peak and the maximum contour valley.
Rmax: represents the distance between the highest peak and the lowest valley within the measurement length.
How to measure surface roughness
Stylus method: The stylus is used to move on the mold surface to record height changes. It is widely used in industrial measurement.
Optical method: Use optical instruments such as microscopes and laser interferometers to measure the roughness of the mold surface.
Electronic method: Use electronic equipment such as scanning electron microscope or atomic force microscope to obtain mold surface morphology information.
Effect of surface roughness
Reduced mechanical properties: The surface roughness of the mold will affect the friction performance, wear resistance and lubrication effect of the mold. The higher the roughness Ra, the service life of the parts will be reduced.
Fatigue strength: Surface contour peaks or contour valleys will become the concentration points of friction, reducing the fatigue strength of parts. Better surface quality can improve the overall fatigue resistance of the part.
Sealing performance: The surface roughness of sealing parts has a great influence on the sealing effect. Surfaces with small roughness can improve sealing performance.
Methods to reduce surface roughness
Selection of processing methods: Precisely controlled CNC processing methods (such as turning, milling, grinding, polishing, etc.) can effectively reduce surface roughness.
Processing parameter optimization: Adjust processing parameters such as cutting speed, feed, tool material and geometry.
Post-processing process: Improve surface quality through surface treatment processes (such as electroplating, sandblasting, grinding, polishing, etc.).
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PMMA new materials and recycled materials are very common in injection molding manufacturing, but there is a certain gap in performance between them. Which one is suitable for your injection molding project? You can read this article to make it easier to choose.
Should PMMA injection molding choose new materials or recycled materials?
There are differences between new PA materials and recycled PA materials in terms of performance, quality, environmental impact and market demand. It is necessary to analyze the application requirements of the project before selecting the appropriate material.
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Should HDPE injection molding choose new materials or recycled materials?
AS new materials have higher performance and stability and are suitable for applications with higher performance requirements, while recycled AS materials are suitable for applications with lower performance requirements due to their environmental protection and cost advantages.
Should AS injection molding choose new materials or recycled materials?
New materials and recycled materials each have their own advantages and disadvantages. The choice of which material to use mainly depends on the product's performance requirements, cost considerations and environmental factors.
How to choose new materials and recycled materials for injection molding PS
For application scenarios with high performance requirements, new materials are still the first choice; while in applications that do not require high performance and pay attention to cost and environmental protection, recycled materials have significant advantages.
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