Heat treatment course of development and application

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(1) Clean the heat treatment
Heat treatment production waste water, waste gas, waste salt, dust, noise and electromagnetic radiation and so impact on the environment caused by pollut ion. Solve the heat treatment of environmental pollution problems, the implementation of clean heat treatment (or the green heat treatment) is one of the developed countries the direction of heat treatment technology development. To reduce SO2, CO, CO2, dust and cinder emissions, has basically put an end to the use of coal as a fuel, heavy oil use fewer, mostly switch to light oil, natural gas is still the best fuel.ball bearing suppliers
The The burning furnace waste heat utilization has reached a high degree of, the burner structure optimization and empty - fuel ratio strictly controlled to ensure that under the premise of reasonable burning, reduce to a minimum the NOX and CO; gas carburizing, carbonitriding alternative salt treatment and vacuum heat treatment technology to reduce waste containing salts and CN-toxic water pollution; using water-soluble synthetic quenching oil instead of part of the quenching oil, using biodegradable vegetable oil instead of part of mineral oil to reduce oil pollution.
(2) precision heat treatment
Precision heat treatment has two meanings: the one hand, according to the requirements of the use of the parts, materials, structure size, physical metallurgy knowledge and state-of-the-art computer simulation and testing technology, to optimize the process parameters to achieve the desired performance or maximize material Another aspect of the potential; fully guarantee the stability of the optimization process to achieve product quality and degree of dispersion is small (or zero), and the heat distortion zero.
(3) energy-saving heat treatment
Scientific production and energy management is the most efficient use of energy has the potential factors, the establishment of a specialized heat treatment plant to ensure full capacity, give full play to the equipment capacity is the choice of the scientific management. Select energy structure in the heat treatment of primary energy; make full use of the waste heat, waste heat; using low-energy, short cycle process instead of a long cycle, energy consumption process.spindle bearings
(4) less non-oxidation heat treatment
Heated to precisely control the carbon potential protective atmosphere heating alternative oxidizing atmosphere, controlled atmosphere heated nitrogen potential, to improve the performance of the parts after heat treatment, heat treatment defects such as decarbonization, cracks, greatly reducing the heat after finishing stay reduced , improve the efficiency of material utilization and machining. Vacuum plus hot gas quenching, vacuum or low pressure carburizing, nitriding, carbon permeation and boronizing can significantly improve the quality and reduce distortion, and increased life expectancy.
Heat treatment technology application effect
(1) to expand the range of applications of GCr15 steel
Generally M quenching GCr15 steel ferrule effective wall thickness of 12mm or less, but the BL quenching nitrate cooling ability, the use of a stirring, string action, add water, and other measures, can be expanded to about 28mm ferrule effective wall thickness.
(2) hardness and stability, good uniformity
BL transformation is a slow process, generally GCr15 steel required 4h GCr18Mo steel need 5h, ferrule in saltpetre in a long time, such as temperature, the surface of the heart tissue shift almost the same time, so the hardness stability, uniformity, general GCr15 steel BL hardness after quenching at 59 to 61HRC, uniformity ≤ 1HRC, and not as quenching ferrule thickness slightly larger low hardness, soft spots, and poor uniformity problems.
(3) reduce quenching, grinding cracks
In the production of railway, rolling mill bearings, rings large size, heavy weight, M tissue fragility oil quenching, high hardness after quenching often take strong cooling measures result quenching microcrack; BL quenching due BL organization is much better than the M tissue toughness, while the surface up to -400 ~-500MPa compressive stress, greatly reduces the tendency of quenching cracks; compressive stress in the grinding surface offset some of the grinding stress, so that the overall stress level decreased greatly reduces the grinding cracks.
(4) increase the bearing life
Withstand large impact loads railway, rolling mill bearings, etc., by the M after quenching the main failure mode: sets of cracks within the assembly, the use of the process by the the impact outer ring ribs off the block, the inner ring fragmentation, austempering bearings Due to the impact toughness, surface stress, regardless assembly sets of cracks, or the process of using coat ribs off the block, within sets of fragmentation tendency greatly reduced, and reduce edge stress concentration roller. Therefore, M quenched after austempering than the average life expectancy and improve the reliability.roller ball bearings