35results about How to "Increase carburizing speed" patented technology

The invention relates to a low-pressure vacuum carbonizing heat treatment method of high-temperature carburized stainless steel. The method comprises the treatment steps of low-pressure vacuum carbonizing, quenching, deep cooling and high-temperature tempering; and the steps can be repeatedly performed. The low-pressure vacuum carbonizing process uses a saturated value adjusting method for multi-section pulse carbonizing; a carbonizing agent adopts acetylene gas; the carbonizing temperature is 850-1050 DEG C; the carbonizing pressure is 100-2000 Pa; and the powerful seepage and dispersion circulating period is 20-70 times. The treatment method is safe, energy-saved and environment-friendly, can eliminate intergranular oxidation, realizes precise control of the seepage layer depth, and canguarantee excellent service performances of prepared materials above 400 DEG C.

The invention discloses a surface fatigue-resistant treatment process for a rotating bearing. The surface fatigue-resistant treatment process for the rotating bearing includes the first step of cleaning, the second step of primary pre-heating, the third step of primary salt bath nitriding, the fourth step of cleaning, the fifth step of primary carburizing treatment, the sixth step of secondary pre-heating, the seventh step of polishing, the eighth step of primary salt bath oxidizing, the ninth step of secondary carburizing treatment, the tenth step of secondary salt bath oxidizing and the eleventh step of rinsing. In the treatment process, salt bath nitriding is performed firstly, then crossed carburizing and salt bath oxidizing treatment is performed, the microhardness of the surface of a rotating bearing cladding layer is highest, the cladding layer is uniform in thickness, uniform in distribution, compact and complete, the combining capacity of the cladding layer and a base material is high, the salt corrosion resistance and the stress corrosion breakage resistance can be further improved, by using the rotating bearing treated through the process, the rotating bearing is stable in size and small in high temperature deformation, the surface hardness reaches HV2500 or above, the dry friction coefficient is reduced to 0.08-0.1, the abrasion resistance is improved by 450%, the fatigue service of the rotating bearing is 10-12 times that of conventional heat treatment, and the comprehensive performance meets the using requirement of an extremely severe environment.

The Invention relates to an atmospheric-pressure acetylene carburizing furnace, comprises a reaction chamber, an acetylene intake duct, an exhaust gas duct, a control and metering apparatus, an exhaust gas measurement apparatus, and a computer controller. The computer controller calculates a total amount of carbon in the furnace and an enrichment rate of a workpiece, and adjusts an acetylene intake volume according to the calculation result until process requirements are met. The Invention realizes carburizing with acetylene under atmospheric pressure and reduces the usage costs while improving the equipment efficiency.

The present invention is permeation promoter for organic RE chemical heat treatment and is application, and aims at solving the problem of RE chloride, which is easy to block dropper. The permeation promoter consists of RE elements 8-12 wt%, vinyl tetrachloride 5-8 wt%, cyclopentadiene RE 1-4 wt%, and ammonium isobutyrate 0-30 wt%, except isomeric acid and isomeric alcohol. The permeation promoter may be used in compounding carburizing and nitriding promoter and in the multiple-element co-permeation of RE, N, C, O, S and B. The organic RE of the present invention is easy to crack inside furnace to decompose active RE atoms for promoting permeation, contains no oxygen, and has higher solubility than RE chloride and less blocking.

The invention relates to lorry spiral bevel gear double-row rare earth continuous gas carburization heat treatment equipment, which relates to automobile spiral bevel gear heat treatment carburization equipment and solves the problems that the defects of thick and big martensite needle and low level of the residue austenite are caused by poor uniformity of a carburization layer and high temperature (higher than the quenching temperature) of a V-region part, the carbon black is easy to generate, the carburization cost is high, the surface hardness of a carburization gear is low, the adhesion and abrasion resistance performance of a gear is poor, the service life is short, and a dripping pipe is easy to block. A material disc and a heating device are arranged in a furnace body, a carburization medium flow rate disc is arranged outside the furnace body and is connected with the furnace body, an anti-coking dripping and nitrogen blockage removing device of the carburization furnace is connected with the furnace body, and a direct connection type lateral fan is arranged on the side wall of the furnace body. The lorry spiral bevel gear double-row rare earth continuous gas carburization heat treatment equipment has the advantages that the operation cost is reduced, the heat treatment production efficiency and the product quality are improved, and the rare earth carburization technology is adopted, so the quality and the yield of the products are greatly improved.

The invention discloses a carburizing method capable of inhibiting a high-chromium high-cobalt carburizing steel network carbide structure and increasing the carburizing speed, and relates to the field of material surface heat treatment. The technical problems that a network carbide structure is prone to occurring to existing high-chromium high-cobalt carburizing steel, and thus, a material is high in brittleness and poor in fatigue resistance need to be solved. The method comprises the steps that 1, a metal film is plated on the surface of high-chromium high-cobalt carburizing steel; and 2, the film plated workpiece is subjected to carburizing. Through the carburizing method, a carburizing layer structure of which the carburizing layer is free of the network carbide structure is obtained,and carbide is uniformly distributed in the carburizing layer. The technical problem that the network carbide structure is prone to occurring during high-alloy steel carburizing is solved. The carburizing method is applied to the field of aircraft bearing gears.