How to measure the surface roughness of the workpiece?
Surface roughness is a kind of microscopic geometric shape error. Commonly used instruments mainly include image measuring instrument, light section microscope, interference microscope and electric profiler. Suzhou Ligao Inspection is a manufacturer of imaging instruments and microscopes. We mainly introduce how to measure the surface roughness of workpieces with these two instruments. Mainly divided into the following methods:
1. Impression method: use paraffin, low melting point alloy or other impression materials, imprint on the surface of the tested part, and place it under a microscope to indirectly measure the tested part. The roughness of the surface. This method is suitable for heavy parts and internal surfaces.
2. Comparison method: use the imager to directly compare the measured surface with the surface roughness model, which is mostly used in workshops to evaluate workpieces with larger surface roughness values.
3. Interferometry: It is a two-dimensional measuring instrument that uses the principle of light wave interference to measure with an interference microscope.
4. Light section method: The measuring instrument uses the light section principle to measure with a double-tube microscope. Commonly used to measure Rz of 0.5~60μm.
5. Needle-tracing method: It means that the second element uses a stylus to directly lightly scratch the surface to be measured to measure the surface roughness.
Hydraulic universal testing machines have very high accuracy requirements.
The hydraulic system is the power drive mechanism of the tensile testing machine.
The specific application of the electronic universal testing machine in the automobile manufacturing process: The electronic universal testing machine needs to be used for automobile parts.
Wave soldering refers to the molten solder (lead-tin alloy), sprayed by electric pump or electromagnetic pump into the solder wave required by the design, can also be formed by injecting nitrogen into the solder pool, so that it is pre-loaded The printed board of the component realizes the soft soldering of the mechanical and electrical connection between the solder end or the pin of the component and the pad of the printed board through the solder wave.
The frequency converter is a power control equipment that uses frequency conversion technology and microelectronics technology to control AC motors by changing the frequency of the motor's working power supply.
Electronic universal testing machine is a necessary equipment to control the quality of products.
The calibration operation of the electronic universal testing machine is still relatively unfamiliar to friends who use it for the first time.
Selective wave soldering defects and their prevention.
Testing machine, broadly speaking, is an instrument that verifies the quality or performance of a product or material according to the design requirements before it is put into use.
The tensile force is not an accurate value after being measured by the testing machine, and subsequent calculations are required to get the desired value.
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