Grinding wheel selection and dressing technology for double disc grinding machine

In the machining process of double disc grinding machine, the selection of grinding wheel and dressing technology are the core factors affecting the quality and efficiency of machining. The material, grain size and hardness of the grinding wheel are the key elements for selection. For example, corundum-type grinding wheels are particularly suitable for grinding steel parts due to their good toughness, while carbide-type grinding wheels have become the first choice for processing hard and brittle materials such as cemented carbide and ceramics by virtue of their high hardness. In terms of grain size, coarse-grained grinding wheels, although high grinding efficiency, but the surface roughness after processing is relatively poor; on the contrary, fine-grained grinding wheels, although the grinding efficiency is slightly lower, but can obtain a smoother surface, suitable for fine grinding process. As for the hardness, the choice of grinding wheel needs to be based on the hardness of the workpiece material to decide: processing of hard materials, should choose a softer wheel, so that the wheel can achieve self-sharpening in the grinding process; and processing of soft materials, you can choose to harden the wheel to ensure the stability and efficiency of grinding.

The dressing technology of the grinding wheel is also vital. The selection of dressing tools and the use of dressing methods directly affect the cutting performance and machining accuracy of the grinding wheel. Because of its high hardness and wear resistance, diamond dresser has become a common tool for dressing grinding wheels on double disc grinding machines, which can effectively restore the geometry and cutting ability of the grinding wheel. There are various dressing methods, including linear dressing, fixed dressing and interpolation dressing. Linear dressing is suitable for grinding wheel wear is relatively uniform, through the diamond dresser along the surface of the grinding wheel straight line movement for dressing; fixed dressing is mainly used for grinding wheel local wear repair, dressing tool is fixed in a specific position, the grinding wheel rotates through the dressing tool for dressing; and interpolated dressing is more delicate, the dressing tool according to the preset trajectory of the movement, can be a high-precision dressing for the grinding wheel, especially for high precision processing scenarios. This is especially suitable for high precision machining scenarios.

In addition, the optimisation of dressing parameters is also a key part of improving machining quality. Reasonable settings of dressing speed and feed can effectively avoid the problem of uneven surface of the grinding wheel, thus ensuring the surface quality of the processed workpiece. Modern double disc grinding machines are usually equipped with advanced grinding wheel dressing devices, these devices can achieve automated grinding wheel dressing, not only improves the dressing efficiency, but also significantly improves the dressing accuracy.

In short, through the scientific and reasonable selection of grinding wheels and optimisation of dressing technology, double disc grinding machines can ensure the processing efficiency and significantly improve the quality of the workpiece, to meet the demand for high-precision machining in different industrial fields.