38results about How to "Reduce heat treatment energy consumption" patented technology

The invention discloses an automobile transmission gear heat treatment method. The method includes the steps of carburization, carbonitriding, quenching, cleaning, low temperature tempering and air cooling. The carburization technique is combined with the carbonitriding technique, abrasion resistance, fatigue strength and corrosive resistance are improved by a layer of highly hard nitride layer obtained on the carburized layer on the surface of a gear, and comprehensive performance of a product is good; meanwhile, the problems of massive carbide appearing under the high carbon potential state and network carbide appearing in the cooling process are avoided, and early-age cracking of the surface of the gear is avoided; moreover, by the method, the technological process is simplified, heating and cooling links and discharge links are reduced, carburization deformation and quenching deformation are reduced, generation of black structures is reduced as well, and anti-fatigue performance is guaranteed; finally, by the method, production cycle is shortened greatly, energy consumption is lowered, and production efficiency is improved highly.

A heat treatment-dehydration-making fertilizer method of urban sewage and sludge is provided, which pertains to the treatment filed of solid waste. Sodium hydroxide is added into dewatered sludge and stirred, hypoxic steam with temperature and pressure more than 250 DEG C and 4MPa is input, the temperature is raised to 120-140 DEG C for 40-100 min; the temperature is reduced to less than 100 DEG C, dehydrated liquid and dehydrated sludge cake with amount decreased are obtained after dehydration; the dehydrated liquid is treated by sand filtration and microfiltration, then whole filtration is carried out and the concentrated solution with humic acid more than 3wt percent is obtained; the humic acid liquid fertilizer is obtained after the concentrated solution is added with additive. The invention can greatly reduce the expenses of sludge heat treatment; water content of the obtained dehydrated sludge cake is less than 60 percent and the total solid reduces by 35 percent; the heavy mental content of the obtained humic acid liquid fertilizer is low, the pH value keeps in the range of weak alkaline and the pathogen is inactivated; the method is safe and efficient, complies with Fertilizer Application Guideline of National Ministry of Agriculture and can be widely applied to harmless, quantitative reduction and resource utilization treatment of urban sewage and sludge.

The invention relates to a novel composite surface-enhanced spiral bevel gear production process system based on a current anti-fatigue manufacturing method system and integrating induction quenching and gas nitriding. The invention aims to provide a composite surface-enhanced cyclo-palloid spiral bevel gear manufacturing method with heated precision of 4 to 6 levels and achieving the purpose that the theory contact zone meshed strength is meshed with carburizing and quenching strength. The invention aims to further provide a new spiral bevel gear production technology which can not only embody the current anti-fatigue high-end gear manufacturing method purpose, but also agree with the complete software and hardware match of a roadmap of heat treatment technology development in China.

The invention discloses a technological method for carrying out solid solution and ageing treatment on a 6061 aluminum alloy, and belongs to the technical field of metal material thermal treatment. The technological method specifically comprises the following steps: (1) homogenizing treatment: carrying out homogenizing treatment and carrying out air-cooling to the room temperature while providing current to a 6061 aluminum alloy cast ingot; (2) thermal extrusion; (3) solid solution treatment: carrying out solid solution treatment and carrying out water-cooling at the room temperature while providing current to square billet; and (4) ageing treatment: carrying out the ageing treatment while providing current to the square billet. According to the technological method, the current intensity, the heating temperature and the heat preservation time of the homogenizing treatment, the solid solution treatment and the ageing treatment are reasonably controlled, so that a workpiece with excellent mechanical properties is finally obtained on the premise of remarkably reducing energy consumption of the thermal treatment, and therefore, the technological method is an aluminum alloy continuous solid solution and ageing treatment technological method which is suitable for quickly heating and reducing energy consumption, and is applied to industrial production.

A disclosed composite carburization quenching technology for a gear comprises the following steps: 1) performing strong carburization; 2) performing diffusion; 3) cooing to 560-580 DEG C, staying at the constant temperature for 1-2 h and cooling; 4) quenching and heating, wherein the first-stage quenching temperature is 865-870 DEG C and the second-stage quenching temperature is 835-845 DEG C; and 5) tempering with a temperature of 260-265 DEG C. The provided composite carburization quenching technology for the gear is reduced in heat processing energy consumption and helps to improve the performances of heavy-duty gears.

The invention discloses a differential-temperature heat treating method for a roller, and relates to the technical field of heat treating. The differential-temperature heat treating method includes the steps of a technological preparation stage, a preheating stage, a differential-temperature preheating stage, a high-speed temperature rising stage and a high-temperature heat preservation stage. According to the differential-temperature heat treating method, the preheating temperature is low and is 480 DEG C to 500 DEG C, the constant temperature before high-speed temperature rising is 800 DEG C to 850 DEG C, a stage-type temperature rising mode is adopted for the high-speed temperature rising stage, three temperature rising nodes exist, heat preservation is carried out for two minutes every time one temperature node is achieved, high-temperature heat preservation is divided two stages, and the heat preservation time and the temperature of the two stages are different. The roller prepared with the heat treating method has high hardness evenness and the good core microstructure, energy consumption of heat treatment can be reduced, and the production cost of an enterprise can be reduced.

The invention discloses an induction heat treatment method for a camshaft end piece. An induction heating apparatus with a magnetic field concentrating device is adopted to inductively quench and temper the notch and the outer circle of the camshaft end piece. The method includes the following steps: sleeving the induction coil of the induction heating device outside the notch and the outer circleof the camshaft end piece, performing heating under a certain direct-current voltage and a direct current, cooling the end piece by a quenching medium, keeping the temperature at a certain value to carry out tempering, and performing air cooling. The induction heat treatment method for the camshaft end piece improves the overall rigidity of the camshaft, reduces friction, makes the camshaft end piece withstand a high valve impact load, reduces the heat treatment energy consumption by 30%, makes the surface hardness and the hardened layer depth meet technical requirements of the product, and achieves the purposes of energy saving, emission reduction and consumption reduction.