The so-called hard grinding material, that is, in the grinding process, the material grinding poor processing of materials. Difficult grinding materials and difficult cutting materials, there are many common features, there are different characteristics. Difficult to wear materials, some are better cutting, such as non-ferrous metals in the copper, aluminum and its alloys. General hardened steel, cutting is difficult, grinding is relatively easy. Difficult grinding materials can be distinguished by the following methods:
(1) according to the metal elements contained in the material to distinguish. (Mn), aluminum (1), tungsten (W), molybdenum (Mo), manganese (Mn), titanium (Ti), aluminum (A1), cobalt (Co), vanadium (V) Improve the strength of the material, toughness, plasticity and heat resistance, reducing the thermal conductivity of the material, grinding is more difficult.
(2) by grinding ratio to distinguish. In most cases, according to the grinding ratio of G (grinding the volume of the material
Grinding wheel wear volume ratio) to distinguish between good and poor grinding performance. Grinding than large, easy grinding material,
On the contrary it is difficult Grinding less than the material, in the grinding process, grinding wheel wear fast, grinding force, grinding temperature is high, easy to produce vibration, low production efficiency.
(3) according to the physical and mechanical properties of the material to distinguish. The toughness of the workpiece material, high plasticity, hardness and thermal conductivity is low, the abrasive is easy to adhere to the surface of the grinding wheel, plug the grinding wheel pores, so that grinding wheel grinding capacity, resulting in increased grinding force, grinding temperature increased. Such as grinding high temperature alloy, titanium alloy, stainless steel, high vanadium high speed steel, pure iron, pure copper, aluminum and so on.
(4) by surface quality to distinguish. Some of the workpiece material in the grinding, easy to produce burns and cracks and rough surface
Roughness, it is difficult to meet the surface quality requirements. Such materials are also difficult to grind.
