Compared with steel, although the strength, plasticity and toughness of cast iron is poor, can not be forged and stamping, its welding performance is also poor, but it has excellent castability, vibration damping and machining advantages, and its production equipment and process is simple, low cost, generally manufacturing some strength, toughness requirements are not too high, with good vibration damping, wear resistance of parts, In particular, the shape is more complex, or relatively large mechanical parts, the absolute amount of automotive manufacturing is surprisingly large.
It is used to manufacture a variety of components, including engine blocks, cylinder heads, differential housing, axles, flywheels, brake drums and brake discs. Widely used in machinery manufacturing, petroleum, chemical industry, metallurgy, mining, transportation, national defense industry and other sectors.
I, mass processing of cast iron leads to frequent tool breakage
how to do?
In the production and processing, the common types of cast iron are generally gray cast iron (HT200, HT250), ductile cast iron, wear-resistant cast iron, high-chromium cast iron, etc., the general characteristics are wear-resistant, high hardness, anti-wear, in the processing of ordinary cast iron materials, we usually choose alloy cutting tools, small batch processing, can meet the needs, but in mass processing, Due to the continuous operation of the tool, in the process of processing due to friction will produce a very high temperature, under high temperature and high pressure, the iron element in the chip and the adhesive phase of the tool and the tool surface, the formation of infinite replacement solid solution, resulting in diffusion wear, while the chip softening adhesion on the tool surface, the tool wear surface formed a uniform adhesive layer resulting in adhesive wear.
Once the cutting tool edge wear or collapse, resulting in a sharp increase in cutting force, so that the workpiece has been processed surface quality significantly decreased, easy to appear edge fracture or collapse, easy to collapse; Therefore, how to choose the right tool to improve processing efficiency is crucial, here, I recommend the use of CBN tools.
II, The characteristics of CBN cutting tools
(1) It has high hardness and wear resistance
The microhardness of CBN wheels single crystal is HV8000 ~ 9000, which is the second highest hardness substance known at present, and the hardness of CBN composite sheet is generally HV3000 ~ 5000.
(2) It has high thermal stability and high temperature hardness
The heat resistance of CBN can reach 1400 ~ 1500℃, and the hardness at 800℃ is the normal temperature hardness of Al2O3/TiC ceramics.
(3) It has high chemical stability
CBN has a high oxidation resistance, no oxidation phenomenon at 1000 ° C, and no chemical reaction with iron materials at 1200 ~ 1300 ° C.
(4) It has good thermal conductivity and low friction coefficient
III, CBN tool processing of cast iron
Cubic boron nitride (CBN) is widely used in cutting high-hardness iron, steel and other ferrous materials for its superior cutting performance. In recent years, through the continuous introduction of advanced equipment, with their own research, the domestic superhard tool industry has flourished, CBN tools have also reached large-scale production, in the continuous improvement of technology at the same time, the price has also dropped significantly, has become a major trend in the field of machining, not only improve labor productivity, improve product quality, but also reduce production costs. Add power to the rapid development of metal cutting technology.
CBN tool – High volume turning of cast iron has obvious advantages