Roughness Testor

A roughness tester, also known as a surface roughness measuring instrument, is a device used to measure the surface roughness of an object. Here's a detailed explanation:

Working Principle

Most roughness testers operate based on the stylus - based measurement principle. The stylus of the instrument comes into contact with the surface being measured. As the stylus moves along the surface, due to the microscopic irregularities of the surface, the stylus experiences vertical displacements. These displacements are converted into electrical signals by a sensor. After being processed and analyzed by the electronic circuit, the values of surface roughness parameters, such as the arithmetic mean deviation of the profile (Ra), the ten - point height of irregularities (Rz), and the maximum height of the profile (Ry), are displayed in numerical or graphical form.

Structural Composition

Typically, a roughness tester consists of a main unit, a sensor, a drive unit, and a measurement platform. The main unit serves as the control and data - processing center of the instrument, responsible for displaying measurement results and setting measurement parameters. The sensor is the key component for measurement, and its accuracy and performance directly affect the accuracy of the measurement results. The drive unit is used to move the sensor along the measured surface, ensuring uniform and stable measurement. The measurement platform is used to hold the workpiece to be measured, ensuring its position remains fixed during the measurement process.

Application Fields

Roughness testers are widely used in many industries, including mechanical processing, automobile manufacturing, aerospace, and the electronics industry. For example, in mechanical processing, they can be used to detect the surface roughness of machined parts to ensure that the quality and performance of the parts meet the requirements. In automobile manufacturing, they are used to measure the surface roughness of critical components such as engine blocks and crankshafts, which affects the engine's sealing, wear resistance, and power output. In the electronics industry, they are used to measure the surface roughness of semiconductor chips and printed circuit boards, which has a significant impact on the performance and reliability of electronic components.