Grinding
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The precision quality of industrial products continuously improving, and the requirements of precision of parts manufacturing is also higher than before, which has reached the demand of micrometer (㎛). However, the machining precision of turning and milling machines cannot reach micron-level accuracy, so it is necessary to use grinding gradually in microns to achieve the required accuracy.
A metal part of an automotive is being grinded by a CNC external grinder.
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Types of Grinding
Grinding is a very important process in precision manufacturing. The types of grinding can be divided into surface grinding, ID grinding, and OD grinding, which correspond to flat workpieces and round workpieces respectively. Grinding typically can be applied to workpieces made of aluminum, copper, cast iron, low carbon steel and stainless steel, etc. Cast iron and low carbon steel have good cylindrical grinding properties, while aluminum and copper have poor cylindrical grinding performance. Stainless steel can be ground with special grinding wheels for its hardness and toughness. Various materials of parts will lead to different choices of grinding wheels on types, properties and fineness.
Wear, Accuracy and Monitoring of GrindingAccuracy and monitoring are emphasized in grinding, which relies on techniques and experience. It is necessary to monitor the accuracy and progress timely during the grinding process, because the grinding wheel is easy to be worn, and the yield of the workpiece will decrease accordingly. The loss of cutting force of the grinding wheels varies greatly, so it is necessary to constantly repair the grinding wheels and make corrections to the grinding wheels to ensure that the accuracy is not affected by the continuous wear of the grinding wheels.
Grinding can make the surface of metal more polished and flat. Good surface roughness of workpiece can reduce wear and have a longer lifetime, which could be energy-saving. So accuracy and good surface roughness of grinding will be required no matter in surface grinding, ID grinding and OD grinding.
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Grinding and Control of Surface Roughness
Surface roughness in precision machining mainly depends on the super-heating rate of the cutting fluid, the stability of workpiece clamping, the way of clamping during the machining, and the rigidity of the grinding machine itself.
In addition, the environmental temperature is one of the factors affecting the grinding accuracy. Metal materials will likely deform under high temperature; thus dressing and dressing and compensation would be required during the machining. In addition, the temperature before and after grinding also affects the accuracy of the finished products. Based on decades of metalworking experience, WKPT has researched parts materials properties with customers, combining with our supply chain and vendors to control the quality of high-precision grinding.
Digital OD Micrometer for Quality Control