79results about How to "Small quenching deformation" patented technology

The invention provides a technique for quenching along the tooth space of a large tooth ring with hardened tooth surfaces on a medium-frequency basis, particularly for quenching and tempering the tooth surfaces along the tooth space on a medium-frequency induction basis. The technique comprises the following steps: 1), carrying out the tool preparation and on-site installation before quenching and tempering; 2), manufacturing medium-frequency copying inductors heating-quenching along the tooth space and taking the shape similar to the profile of the tooth space, and quenching and back-cooling the tooth surfaces in a synchronous manner; 3), quenching at intervals of 3 tooth spaces, wherein, one round of the rotation of the parts, that is, 54 teeth, constitutes a working cycle; 4) testing the hardness of a first quenching tooth surface every cycle; and 5), carrying out the tempering heat treatment in a half-tooth ring manner after the surface is quenched. The quenching level of the tooth surfaces of the large tooth ring with the hardened tooth surfaces reaches HRC40-45; the depth of effective hardening layers is larger than or equal to 4mm; the accuracy of the tooth wheel reaches the 988GE level; the tooth ring has the advantages of light and handy structure, large size and service life as long as two times of the ordinary tooth ring with the same specification; and the technique remarkably reduces the weight of the equipment, improves the reliability thereof, and improves the running efficiency thereof.

The double liquid quenching process of 9Cr2Mo straightening roller includes the first quick cooling in water to avoid high temperature decomposition of overcooling austenite to the martensite transformation temperature, and the subsequent cooling in oil for martensite transformation to raise the hardness, reduce quenching deformation and avoid cracking. Before being loaded to furnace, the straightening roller has its end surfaces and central through hole covered with plates to reduce the quench cooling of these parts and ensure hardness of HRC 35-40.

The invention relates to a heat treatment deformation control method for a large-diameter and large-modulus elliptical molded surface container semispherical shell and belongs to the technical field of container manufacturing. By means of the heat treatment deformation method, due to the fact that an integrated quenching and aging heat treatment tool is designed, the elliptical molded surface container semispherical shell and the heat treatment tool can be tightly matched, the quenching transfer time is shortened, the phenomenon that the top of the shell collapses and pits happen in the circumferential direction of the shell during quenching is avoided, quenching and time aging deformation is reduced, and therefore the heat treatment performance of the elliptical molded surface container semispherical shell can be ensured; and meanwhile, the subsequent machining precision of the shell is also ensured. In addition, a UCON water solution with the concentration ranging from 6% to 10% is adopted in the method to serve as a quenching medium, dynamic flowing of the water solution is maintained, the cooling speed and uniformity of the shell are ensured, meanwhile, quenching deformation is also controlled, and therefore the product precision is ensured.

The invention discloses a water-soluble quenching medium used in high-chromium cast iron quenching. The medium comprises the blended materials of, by weight, 12-18 parts of polyvinyl pyrrolidone, 1-3 parts of sodium polyacrylate , 6-8 parts of an anti-rust agent, 0.5 parts of a bactericide, 5 parts of a pH adjusting agent, and 65.5-75.5 parts of water. The medium is suitable for high-chromium cast iron quenching, and is safe and environment-friendly. The medium has relatively low cooling speed, such that quenched product has good wear resistance, and heat treatment requirement of high-chromium cast iron quenching can be sufficiently satisfied.

The invention relates to a composite carburizing and quenching heat treatment method of a gear, and belongs to the technical field of heat treatment. The method comprises the steps of carburization, cooling, heating, quenching and tempering. The composite carburizing and quenching heat treatment method can effectively refine grains and martensite needles, improves the gear surface hardness, further improves the wear resistance, the fatigue strength and the corrosion resistance of the gear, and improves comprehensive mechanical performance of the gear.

A bearing heat treatment technology is characterized by comprising the steps that (1) spheroidizing annealing is performed, specifically, a, the first spheroidizing annealing is performed, and b, thesecond spheroidizing annealing is performed; (2) quenching is performed, specifically, the quenching temperature is firstly increased to 650-670 DEG C at a heating rate of 10-15 DEG C/h during quenching, preheating is carried out at 650-670 DEG C for 10-15 minutes, and the quenching temperature is further increased to 835-840 DEG C at the heating rate of 8-12 DEG C/h for quenching heat preservation for 35-40 minutes; and (3) cooling treatment is performed, specifically, tapping air cooling is carried out after the temperature is decreased to be below 160 DEG C by furnace cooling. The inventiondiscloses novel bearing steel and the heat treatment technology. The machining accuracy and impact toughness of the steel can be improved, and the fatigue life of the steel can be prolonged.

The invention discloses an elongated gear shaft heat treatment deformation control process method. The method comprises the following steps that rough machining is carried out; stress-relieving and annealing treatment are carried out on a part after the rough machining; hobbing is carried out, the hobbing are carried out at the two ends of the part, and grinding allowance of the tooth surface is reserved; carburizing treatment is carried out, deformation direction and deformation quantity of the part are detected after carburization; pressurization, straightening and quenching treatments are carried out, according to the deformation direction and the deformation quantity of the part, a pressurizing position is selected, and a supporting part is correspondingly arranged; a pressurizing heavy object is placed at the upper end of the part corresponding to the pressurizing position; the part, the supporting part and the pressurizing heavy object are integrally hoisted into a quenching furnace for heat preservation, and then the quenching oil is wholly hoisted; and after quenching, low-temperature tempering and stress-relieving treatment are carried out. According to the technological process, a supporting point is arranged in the quenching process, pressurizing and quenching are carried out at the supporting point, so that deformation caused by quenching can be effectively reduced,the qualified rate is greatly improved, the rejection rate is remarkably reduced, and the problem that deformation control of the large-span herringbone-tooth long gear shaft is solved.

The invention discloses a thermal treatment device and a thermal treatment technology of an ultra-long aluminum extrusion, and belongs to the technical field of material processing. The thermal treatment device comprises a heating furnace, a quenching water well, a feeding and discharge rail, a feeding trolley, a discharge trolley, a lifting device and a material basket, wherein a furnace body isan ultra-long horizontal furnace composed of a plurality of regions of which the temperature is independently controlled; and a product is horizontally stacked in the material basket, and enters the furnace body or the quenching water well through the feeding trolley, the discharge trolley and the lifting device to be subjected to thermal treatment. According to the thermal treatment device and the thermal treatment technology, horizontal furnace horizontal heating and inclined descend soaking quenching technologies are adopted to replace traditional vertical quenching and roller hearth type quenching technologies, the quenching cooling speed is high and uniform, quenching deformation of the product is low, surface quality is good, and performance is uniform; solid-solution quenching, annealing and ageing functions can be achieved, production scheduling is flexible, length of a biggest product of thermal treatment is large, charge batch is large, production efficiency and heat utilization rate are high, and operation is safe and reliable; and besides, deep well, heat-resistant roller, spraying devices, and the like are not required, basic requirements on equipment are low, and investment is low.

The invention relates to a suspension device for gearshaft carburizing and quenching. The device comprises a hanging pillar, an upper support plate, a lower support plate, a base plate and five identical vertical columns; the hanging pillar passes through the center openings of the upper support plate and the lower support plate, and is fixed with the upper support plate, the lower support plate and the base plate through welding, and a hoisting opening is positioned at the top of the hanging pillar; the five vertical columns respectively pass through openings circumferentially and uniformly distributed on the upper support plate and the lower support plate, and are fixed with the upper support plate, the lower support plate and the base plate through welding, with the tops of the five vertical columns flush with the upper support plate, and the diameters of the five vertical columns equal to the diameter of the hanging pillar; the upper support plate is provided with five circumferentially and uniformly distributed through holes for placing the gearshaft, and is also equipped with five oil holes uniformly distributed on two circumferences of different diameters; the lower support plate and the upper support plate have the same structure; and the base plate is provided with four circumferentially and uniformly distributed oil holes. Employment of the device provided in the invention for carburizing and quenching a gearshaft can control the gearshaft deformation after carburizing and quenching, thus reducing the rejection rate of gearshafts.

The invention relates to a heat treatment method for a part of the thin steel sheet class. The method comprises the following steps: (1) exhaust; (2) lifting of carbon potential; (3) rapid carburization; (4) even cooling; (5) quenching; and (6) deoiling, low-temperature tempering to complete the process of heat treatment. The heat treatment method uses the process of low-temperature treatment, causes small deformation to a flake-type part, omits the trivial working procedures of flat clamping and tempering, accelerates the production schedule; compared with the prior art, the method reduces the production time by 40 minutes per furnace and shortens the production period by 20 percent; simultaneously, the low-temperature process reduces electricity consumption, saves energy and can not generate mass black carbon; and the obtained finished part has high surface hardness, slightly reduces the strength, and has good plasticity; and the method is suitable for treating the thin steel sheet type part which has small stress, requires wearing resistance and is easy to deform, thereby having large popularization and application potential.

The invention discloses a spherodial graphite cast iron cast gear and a machining process thereof. The spherodial graphite cast iron cast gear mainly comprises, by weight, 3.5%-3.6% of C, 2.3%-2.4% of Si, 0.4%-0.45% of Mn, less than 0.1% of Cr, 0.4%-0.45% of Cu, 0.03%-0.045% of Mg, not larger than 0.02% of S, not larger than 0.05% of P and the balance Fe. The machining process of the gear includes the following steps of firstly, molten iron smelting, secondly, spheroidizing inoculation, thirdly, casting molding, fourthly, shot blasting, fifthly, thermal treatment, sixthly, rough machining, seventhly, surface hardening and eighthly, finish machining. According to the cast gear, low-manganese scrap steel serves as a raw material, production cost can be lowered, and the gear cast through spherodial graphite cast iron has the comprehensive performances of being high in strength, high in wear resistance and high in flexibility and can meet the requirement of a transmission gear.

The invention discloses a cryogenic heat treatment technology for improving performances of a countershaft gear. According to the technology, a salt bath quenching technology and a cryogenic technology are combined, so that the defects that the countershaft gear is liable to quenching deformation and is low in surface hardness are improved, and the service life of a countershaft is prolonged. The cryogenic heat treatment technology for improving performances of the countershaft gear is characterized by comprising the specific steps of cleaning, preheating, carburization, salt bath quenching, cryogenic treatment and secondary tempering. Compared with the prior art, the technology has the advantages that in the quenching stage, salt bath quenching is combined with a novel technology of cryogenic treatment, so that the deformation degree of the countershaft gear after carburization and quenching is enabled to be small, and the surface hardness is greatly improved.

The invention relates to a laser quenching hardening method for a tooth root of an inner gear ring. The method is characterized by comprising the following specific steps of: placing the inner gear ring on a special clamp on a digital control precise rotary working table, and placing a light blocking ring at the upper end of the gear ring; allowing a single laser beam or double laser beams to enter the surface to be quenched of the bottom of the tooth space of the gear ring, and the connected tooth side at an angle of 20 to 90 degrees; and moving a light guide head up and down or moving the light guide head up and down and rotating, and forming a laser hardening belt on a treatment surface, wherein the tooth root of the gear ring is quickly scanned by the laser beam with highly concentrated energy to ensure that the surface temperature of the scanned tooth root of the gear ring is raised quickly to over a phase change point, the quenching deformation is small compared with that of the conventional thermal treatment process, and energy consumption is reduced.

The invention discloses a heat treatment process for die steel. The heat treatment process is characterized in that the die steel is a 7CrSiMnMoV material which contains, by mass, 0.65 to 0.75% of C, 0.85 to 1.15% of Si, 0.65 to 1.05% of Mn, 0.90 to 1.20% of Cr, 0.20 to 0.50% of Mo, 0.15 to 0.30% of V, no more than 0.030% of P and no more than 0.030% of S, with the balance being Fe; and the heat treatment process comprises the following steps: (1) complete annealing; (2) under annealing; (3) quenching; and (4) tempering. The heat treatment process for the die steel can improve the structure stability of the die steel and comprehensive performance like hardness, wear resistance and toughness of the die steel.

The invention discloses a novel quenching deformation control method for a machine tool slide guide. A slide guide that is made of an HT200 or HT300 cast iron material of a precision machine tool is subjected to surface high-frequency heating and quenching. The two ends of the slide guide (1) are fixed and a pressing force is applied on the middle part of a surface (5). The size of the pressing force is based on that the degree of deformation of the middle part of the guide is 1 mm. Then the slide guide is subjected to surface high-frequency induction quenching. By adjustment of process parameters, the pressing force and the stress are approximate and offset with each other so that an effect of micro-deformation or no deformation can be achieved, thus meeting technical requirements and production needs. The economic benefit of the method is significant.

The invention relates to a heat treatment quenching device, in particular to a die press quenching device for fully quenching steel ferrules. The die press quenching device comprises a base, a stand column at one side of the base and a cross beam at the upper end of the stand column, wherein an upper sliding block and a lower sliding block are respectively arranged on a guiding rail of the stand column, and piston rods of an upper die cylinder and a lower die cylinder are respectively connected with the upper sliding block and the lower sliding block. The die press quenching device is characterized in that a high-pressure pipeline is connected with the upper die cylinder and the lower die cylinder respectively, a one-way speed regulating valve and a reversing valve I, which are used for controlling the speed and the direction of the upper die cylinder, are respectively arranged on a high pressure pipeline connected with the upper die cylinder, a pressure regulating valve and a reversing valve II, which are used for controlling the pressure and the direction of the lower die cylinder, are respectively arranged on a high pressure pipeline connected with the lower die cylinder, and cooling oil for quenching is connected with an oil outlet and an oil spraying ring on the lower die. According to the device, the press quenching force and the press quenching speed can be precisely regulated, the quenching time is short, the deformation of quenched workpieces is small, the quenching quality is effectively ensured, and existing quenching and controlling technologies are greatly improved.

The invention relates to a method for controlling the surface hardness of a bearing spacer ring, and belongs to the technical field of bearing spacer ring processing. The method for controlling the surface hardness of the bearing spacer ring comprises the following steps of carrying out primary machining on the surface of the bearing spacer ring; putting the bearing spacer ring into a mesh belt furnace, and carrying out carbonitriding heat treatment, wherein the heat treatment process adopts manners of rising the temperature in stages and heating symmetrically; and carrying out secondary machining on the heat-treated bearing spacer ring. According to the method for controlling the surface hardness of the bearing spacer ring provided by the invention, by adopting the treatment process combining primary machining, carbonitriding and secondary machining, the surface hardness of the bearing spacer ring is dynamically controlled, so that the surface hardness of a finished product and the thickness of a hardening layer are promoted to be uniform and within the tolerance range of the technical requirement, the occurrence of the phenomenon that the surface hardness is too low or too high is avoided, and the generation of batch wastes caused by unqualified surface hardness of the finished product is avoided.