122 results about "Gas quenching" patented technology

The invention discloses a thermal shock failure prediction and laser repair device for a thermal barrier coating and an application method. The device comprises a multi-physics field coupling simulation analysis module, a thermal shock experiment loading module, an online damage monitoring and failure diagnosis module, a robot laser repair execution module and a central control and data processing core unit. A thermal-mechanical-chemical coupling model is established to predict a coating failure behavior, a high-frequency induction heating and gas quenching system is adopted to simulate an extreme thermal shock environment, a multi-band thermal infrared imager, an ultrasonic probe and a digital image related system are integrated to monitor damage evolution in real time, and in-situ repair of a damaged area is realized based on a six-degree-of-freedom industrial robot. According to the method, the whole-process closed-loop control from failure prediction to repair regeneration is realized, the problems of single function and lack of multi-field coupling analysis and real-time repair capability in the prior art are solved, and the service reliability evaluation precision and the remanufacturing efficiency of the thermal barrier coating are remarkably improved.

The utility model relates to a return-air-free gas quenching device and a perovskite thin film production line, and the device comprises a frame body mechanism which comprises a first supporting body and a support movably connected to the first supporting body along a first direction; the driving mechanism comprises a second supporting body arranged on the support and a rotating part movably connected to the second supporting body in the second direction, and the plane where the first direction is located is perpendicular to the plane where the second direction is located; the air knife mechanism comprises an air knife rest connected to the output end of the rotating part, an air knife body arranged on the air knife rest, an air baffle movably arranged on the air knife rest in the second direction and an adjusting assembly arranged on the air knife rest and used for adjusting the air baffle to move in the second direction. Through the arrangement, the problems of non-uniform crystallization, cracks, bubbles and the like caused by return air in a flexible roll-to-roll perovskite solar cell functional layer coating process are solved, and uniform crystallization and a high-quality coating layer are realized.

The invention discloses a niobium-zirconium alloy and nickel-based alloy vacuum brazing process and a part, and belongs to the technical field of vacuum brazing. According to the process, a vacuum brazing furnace is adopted for brazing, and BNi-2 brazing filler metal is used; the process comprises the following steps that S1, a welding assembly structure formed by a niobium-zirconium alloy part and a nickel-based alloy part is assembled, and BNi-2 brazing filler metal is arranged at the matching position of the welding assembly structure; s2, staged heating is carried out on the welding assembly structure under the preset vacuum degree of the vacuum brazing furnace, and the staged heating comprises a foreign matter removing heating stage, a brazing filler metal solid diffusion heating stage and a brazing filler metal melting wetting heating stage which are sequentially carried out; and S3, staged cooling is conducted on the welded assembly structure after welding is completed, the staged cooling comprises a furnace cooling stage and a gas quenching cooling stage which are conducted in sequence, according to the scheme, defect control over the niobium-zirconium alloy and nickel-based alloy welding joint can be effectively achieved, and the strength and sealing performance of the welding joint are guaranteed.

The invention discloses a heat treatment process of a gear, which relates to the technical field of automobile gear heat treatment, and comprises the following steps: S1, blanking, S2, forging, S3, normalizing: preheating the gear in a preheating furnace by adopting a heating mode of combining infrared radiation and hot air circulation, S4, rough machining, S5, carburizing and quenching: carburizing and quenching, s6, induction heat quenching: performing induction heat quenching on an induction coil; S7, nitriding treatment; S8, low-temperature tempering; S9, finish machining; normalizing is combined with infrared radiation, hot air circulation preheating and induction heating, the effects of reducing energy consumption and machining cost and improving production efficiency are achieved, the forging force is reduced through isothermal forging, the energy consumption of equipment is greatly reduced, pulse type vacuum carburizing, high-pressure gas quenching and induction heat quenching are adopted to introduce a self-adaptive induction heating technology, and the energy consumption of equipment is greatly reduced. And a plasma nitriding technology and a composite nitriding technology are adopted, so that the surface hardness, wear resistance and fatigue strength are improved.

The embodiment of the invention relates to a machining method of small-deformation gear steel and a gear piece, and belongs to the technical field of gear steel. The machining method comprises the following steps: S1, carrying out microalloying treatment on the gear steel by adopting Ti and / or Nb; s2, the gear steel subjected to microalloying treatment is rolled, and a gear steel bar is obtained; s3, the gear steel bar is sequentially subjected to blank forging, heat treatment after forging and machining, and a to-be-carburized gear is obtained; s4, the gear to be carburized is subjected to carburizing treatment and diffusion treatment, and a gear piece is obtained; s5, the gear part is subjected to gas quenching treatment, and the gear part is cooled to the room temperature in stages; and S6, the gear piece subjected to gas quenching treatment is subjected to tempering treatment. According to the invention, through the microalloying treatment of the gear steel and the staged gas quenching treatment of the gear piece, the quenching deformation of the gear piece is controlled, and the deformation after quenching is greatly reduced, so that the gear piece with good dimensional precision control is obtained.

The utility model discloses a vacuum sealing device for a vacuum high-pressure gas quenching furnace. The vacuum sealing device comprises a sealing flange seat, a flange cover, a furnace shell flange, a dynamic sealing assembly and a static sealing assembly, the furnace shell flange is arranged on the vacuum high-pressure gas quenching furnace body, and the flange cover is arranged on the furnace shell flange; a flange base extending section is formed at the bottom of the sealing flange base and penetrates through the flange cover, the sealing flange base is located above the flange cover, and the flange cover is in static sealing connection with the flange base extending section and the furnace shell flange through a static sealing assembly. The cylinder piston rod assembly is arranged on the sealing flange seat, penetrates through the sealing flange seat, the flange seat extension section, the flange cover and the furnace shell flange and then is inserted into the vacuum high-pressure gas quenching furnace body; the hot zone cabin cover is connected with the cylinder piston rod assembly; the air cylinder piston rod assembly is in dynamic sealing connection with the flange base extension section through the dynamic sealing assembly. The utility model relates to the technical field of vacuum furnaces, and can solve the problem of poor dynamic sealing effect of an O-shaped sealing ring between a cylinder piston rod and a furnace body in the prior art.

Disclosed in the present invention is a clean heat treatment control method for achieving high hardness and minimal deformation of a cold-work die, comprising: double-stage isothermal high-pressure gas quenching: introducing a high-pressure gas quenching gas into a vacuum furnace and stopping introduction of the high-pressure gas quenching gas once the surface temperature of a cold-work die has been cooled to a metastable austenite zone; enabling the temperature of a core portion of the cold-work die to be reduced to 50ºC above the metastable austenite zone by means of gas circulation, and then continuing to introduce the high-pressure gas quenching gas until the surface temperature of the cold-work die is reduced to a martensite point or below; then continuing to heat the cold-work die to a lower bainite zone, maintaining the temperature to enable the core portion to undergo lower bainite transformation, and then cooling the cold-work die to room temperature; and then carrying out high-temperature tempering two or three times. According to the present invention, two-stage vacuum high-pressure gas quenching isothermal treatment, i.e., vacuum high-pressure gas quenching and isothermal quenching in the metastable austenite zone and the lower bainite zone, is performed, and thermal stress and structural stress are controlled by means of the two-stage isothermal treatment so as to control the deformation of the die, thereby achieving accurate control of the structure and stress, controlling the deformation of the die to be within 0.05%.

The utility model relates to the technical field of waste heat recovery, and discloses a vacuum gas quenching furnace waste heat recovery structure which comprises a base, a vacuum furnace is fixedly installed on the outer surface of the upper end of the base, a sealing cover is movably connected to the outer surface of the upper end of the vacuum furnace, and a vacuum pump is fixedly installed on the outer surface of the upper end of the sealing cover. The device comprises a base and a vacuum furnace, an air inflation tank is fixedly installed on the outer surface of one side of the base and connected with the vacuum furnace through a pipeline, the vacuum furnace comprises an outer shell and an inner shell, and a heat exchange pipeline is fixedly installed in a gap between the outer shell and the inner shell. According to the vacuum gas quenching furnace, the arranged heat exchange pipelines are of a spiral annular structure and are evenly distributed on the outer wall of the inner shell, waste heat of the vacuum gas quenching furnace can be recycled to the maximum extent, the contact area with a medium needing to be heated is increased through the spiral pipe on the inner side of the exchange box, and waste heat stored in the heat storage tank can be sufficiently transferred to the medium needing to be heated; therefore, the utilization efficiency of energy is effectively improved.

The invention relates to 20MnCrS5 carburizing steel and a method for manufacturing carburizing steel parts. The 20MnCrS5 carburizing steel comprises 0.17%-0.20% of C, less than or equal to 0.25% of Si, 1.10%-1.40% of Mn, 1.00%-1.30% of Cr, 0.02%-0.05% of Al, 0.02%-0.04% of S, 0.1%-0.4% of Ni, 0.015%-0.03% of Nb, less than or equal to 0.08% of Mo, 0.1%-0.25% of Cu, less than or equal to 0.015% of P, less than or equal to 0.008% of N and the balance Fe and inevitable impurities. The method comprises the following steps: forging a part by using 20MnCrS5 carburizing steel; the forged part is subjected to pre-oxidation; the pre-oxidized part is subjected to vacuum carburizing treatment, and the carburizing temperature ranges from 950 DEG C to 1000 DEG C; and the carburized part is subjected to high-pressure gas quenching. The Nb element is added on the basis of traditional 20MnCrS5 steel, meanwhile, the content of Ni and the content of Cu are increased, the high-temperature carburizing technology and the follow-up cooling technology are improved, and therefore the problem that carburizing steel parts are prone to thermal deformation in the high-temperature carburizing technology is solved.

The invention discloses a treatment system and method for high-temperature waste gas of a gas-based shaft furnace. The treatment system comprises a gas-based shaft furnace reactor, a top gas heat exchanger, a process gas preheater and a process gas quench tower, a high-temperature waste gas outlet of the gas-based shaft furnace reactor is sequentially communicated with a top gas heat exchanger, a process gas preheater and a process gas quench tower; the process gas quench tower comprises a tower body, a vortex gas inlet device is arranged at the inner lower part of the tower body, a structural filling layer is arranged at the inner middle part of the tower body, and a high-pressure water spray cooling device is arranged at the inner upper part of the tower body. According to the process gas quench tower, the vortex gas inlet device and the vortex technology are adopted as an effective pretreatment mode, and by optimizing the gas inlet flowing state of waste gas, the temperature of the waste gas can be effectively reduced and the heat energy loss can be reduced under the condition that the gas flow speed is ensured; and due to the application of the structural filling layer, the heat transfer efficiency between the waste gas and the cooling medium is improved by increasing the heat exchange surface area, and the cooling effect is further improved.

To provide a quenching apparatus and a quenching method with which gas quenching employing hydrogen gas can be efficiently performed.MEANS FOR SOLVING THE PROBLEM: The present invention discloses a quenching apparatus having: a quenching chamber for air blast cooling a material using hydrogen gas; a heat exchanger for cooling the hydrogen gas; a first pipe for supplying the heat exchanger with hydrogen gas discharged from the quenching chamber; and a second pipe for supplying the quenching chamber with hydrogen gas cooled by means of the heat exchanger.SELECTED DRAWING: Figure 1

The invention belongs to the technical field of vacuum heat treatment, and discloses an efficient gas quenching chamber applying an adjustable left-right reversing plate structure, which comprises a shell, an adjustable flow guide device and a fan system, the gas quenching furnace shell is cylindrical, the upper part is provided with left and right lifting lug structures for lifting operation, the lower part is provided with a supporting structure for supporting the furnace body, the two sides of the shell are respectively provided with a motor, and the motors are connected with the impeller through rotating shafts extending into the furnace body and are used for controlling the rotating speed to drive the impeller to rotate and providing power for circulating flow of quenching gas in the furnace. The adjustable left-right reversing plate structure is adopted, flexible adjustment can be conducted according to the actual cooling requirement, the workpiece shape, the workpiece size and the like, the flowing direction and path of quenching gas are dynamically adjusted, and the stability and uniformity of the quenching gas under different working conditions are guaranteed.

The utility model relates to the technical field of polycrystalline silicon processing, in particular to a polycrystalline silicon cold hydrogenation reaction gas quenching system which comprises a quenching tower, a quenching tank, a condenser and a slurry concentration tank, the top of the quench tower is provided with a first return pipeline communicated with the condenser, and the bottom of the quench tower is provided with a second return pipeline communicated with the quench tank; the quenching tank is communicated with the slurry concentration tank, the quenching tank is provided with an air inlet, and the air inlet is communicated with the cold hydrogenation reactor. According to the polycrystalline silicon cold hydrogenation reaction gas quenching device, the two towers are arranged for cooling, and the return pipelines are arranged in the quenching tower, the quenching tank and the condenser, so that the technical problems that the quenching tower is easy to block and the circulating pump is easy to damage to cause accidental shutdown in the existing polycrystalline silicon cold hydrogenation reaction gas quenching device are solved.

The invention discloses a high-capacity long-life BCC type high-entropy hydrogen storage alloy and a preparation method thereof, the chemical composition general formula of the high-entropy hydrogen storage alloy is TixNbyCrzMor, in the formula, x, y, z and r are atomic ratios, and x is more than or equal to 0.30 and less than or equal to 0.35, y is more than or equal to 0.05 and less than or equal to 0.10, z is more than or equal to 0.35 and less than or equal to 0.35, and r is more than or equal to 0.10 and less than or equal to 0.15; the high-entropy hydrogen storage alloy is mainly obtained through burdening, smelting, high-temperature solid solution and gas quenching treatment in sequence, the preparation method is simple, the process is easy to control, the prepared material is stable in structure, uniform in alloy component and uniform in grain size and has excellent hydrogen absorption / desorption capacity, hydrogen absorption / desorption power and cycle life, the maximum hydrogen absorption capacity reaches up to 3.6 wt.%, and the high-entropy hydrogen storage alloy can be used for hydrogen storage. The maximum reversible hydrogen desorption capacity reaches 2.51 wt.%, and the capacity retention ratio after 100 cycles of hydrogen absorption and desorption is greater than 90%.

The utility model discloses a safe sealing device for a high-pressure gas quenching vacuum furnace, relates to the technical field of safe sealing devices for high-pressure gas quenching vacuum furnaces, and solves the problems that if the weight of a sealing cover is too heavy, the sealing cover is difficult to effectively move upwards only by virtue of single matching among a spring, a cross rod, an extrusion block and a bolt, and if only one group of matching structure is arranged, the sealing cover is difficult to move upwards. In order to solve the problems that in the moving process of a sealing cover, the gravity center is unstable, and the like, a supporting frame is included, a lifting mechanism comprises an outer frame and screw rods, lifting blocks are connected to the outer sides of the screw rods in a screwed mode correspondingly, and the outer side surfaces of the sealing cover are fixedly installed at one ends of the lifting blocks correspondingly. The lifting blocks with the outer sides in threaded connection with the lifting blocks can be driven to do lifting motion, when the lifting blocks move upwards, the sealing cover installed at one end is driven to move upwards synchronously, by means of cooperative work of the multiple sets of lifting blocks, the sealing cover can be lifted upwards stably and smoothly, and the lifting process is stable and reliable.

The present application discloses a vacuum high-pressure gas quenching furnace with diverse flow channels and a processing method thereof, relating to the field of heat treatment technology, comprising a gas quenching furnace body, a support frame provided at the bottom of the gas quenching furnace body, a fixed structure provided on the inner wall of the gas quenching furnace body, a gas quenching chamber provided on the fixed structure, a fixed frame for placing workpieces provided on the inner wall of the gas quenching chamber, a heating structure provided on the inner wall of the gas quenching chamber, a cooling structure connected to the inner wall of the gas quenching furnace body provided at one end of the gas quenching chamber body, a convection mechanism connected to the gas quenching furnace body provided on the side of the cooling structure away from the gas quenching chamber body, and a guide mechanism corresponding to the side wall of the gas quenching chamber body provided on the side of the gas quenching chamber body. The workpiece is quenched by heating through the heating structure, and the heat flow in the gas quenching chamber is transported to the cooling structure for cooling through the guide mechanism and the convection mechanism, thereby accelerating the airflow rate, ensuring sufficient contact between the workpiece and the airflow, and improving the heat treatment efficiency of the workpiece.

The utility model relates to the technical field of gas quenching furnaces, in particular to a heating assembly of a single-chamber gas quenching furnace, which comprises a workbench, the upper end of the workbench is fixedly connected with two groups of symmetrical base frames, the upper ends of the two groups of base frames are jointly and rotatably connected with a heating barrel through rollers, and the outer side of the heating barrel is in a symmetrical conical design. A rotating mechanism is mounted at one end of the heating barrel, a furnace door is arranged at the other end of the heating barrel, an exhaust pipe is fixedly connected to the outer side of the heating barrel, a gas quenching furnace body is rotatably connected to the inner side of the heating barrel, and a clamping mechanism is mounted on the inner side of the gas quenching furnace body. The first rotating shaft rotates and drives the brush to scrape and brush the inner wall of the gas quenching furnace body at the same time, manual independent cleaning is not needed, time and labor are saved, through mutual cooperation of the first sliding block and the second sliding block, the first sliding block can drive the grabbing clamp to move, the metal piece is clamped and fixed, and follow-up heating is facilitated.

The utility model discloses a furnace door of a vacuum gas quenching furnace, which comprises a furnace door body and locking teeth arranged on the periphery of the furnace door body. The furnace door body comprises a first-layer steel plate and a second-layer steel plate, the first-layer steel plate and the second-layer steel plate are welded, a heat insulation layer is arranged between the first-layer steel plate and the second-layer steel plate, and the heat insulation layer uses circulating cooling water for heat insulation; wherein the first-layer steel plate faces the inside of the vacuum gas quenching furnace, the second-layer steel plate faces the outside of the furnace, a water inlet hole is formed in the upper end of the second-layer steel plate, a water outlet hole is formed in the lower end of the second-layer steel plate, and the water inlet hole and the water outlet hole are connected with a device for circulating cooling water. The vacuum gas quenching furnace door provided by the utility model adopts a double-layer structural design, so that the deformation of the furnace door in a working state is reduced, and gas leakage is reduced; the heat insulation layer is arranged to improve the heat stability of the furnace door; and the locking teeth and the locking ring are matched, so that the furnace door can be tightly pressed on the furnace body during use, and the sealing performance is improved.

The present application belongs to the technical field of wind speed test tooling, and particularly relates to a wind speed test tooling for the inside of a gas quenching furnace. The present application comprises a gas quenching furnace main body, the inside of which is provided with a test tooling fixing seat, the inside of which is provided with a fixing rotating part, and the test tooling fixing seat is provided with a telescopic speed measurement assembly which can rotate. The telescopic speed measurement assembly can simultaneously measure the speed of multiple measuring points, and the measured wind speed is transmitted to a positioning control part and then to external receiving equipment. The fixing rotating part controls the angle of the telescopic speed measurement assembly, and the positioning control part controls the length of the telescopic speed measurement assembly. The point position of the measuring point to be tested is determined remotely, the detection range is large, the degree of automation is high, the built-in independent power supply exports the wind speed data in a closed environment, effectively reduces the speed measurement time, reduces the influence of time factors on the speed measurement result, and improves the speed measurement accuracy.

The present disclosure relates to a gas cooling cell, the cell comprising a chamber, one or more openings within the chamber for accessing a processing space within the chamber, one or more doors for closing the openings, and a system (4) within the chamber comprising one or more movable walls (42), wherein the wall is movable between a first position in which it forms a barrier between the opening and the processing space and a second position in which it allows access from the opening to the processing space.

The invention provides a para-aramid fiber processing method based on a microwave-infrared synergistic field effect, and relates to the technical field of high-performance fiber manufacturing. The treatment method comprises the following steps: carrying out heat treatment on undried para-aramid fibers to obtain para-aramid fibers subjected to heat treatment; wherein the heat treatment comprises microwave treatment, infrared treatment and gas quenching shock cooling treatment which are sequentially carried out. According to the processing method of the para-aramid fiber, a'microwave unwrapping-infrared orientation-shock cooling locking 'three-section energy field cooperation mechanism is adopted, gradient energy field time sequence action is performed on the undried fiber, and a'dynamic self-alignment effect' of a molecular chain is triggered, so that the elastic modulus and the orientation degree are remarkably improved.

The utility model relates to the technical field of gas quenching furnaces, in particular to a ventilation assembly of a single-chamber gas quenching furnace, which comprises a workbench, the upper end of the workbench is fixedly connected with two groups of symmetrical first fixing blocks, the upper ends of the two groups of first fixing blocks are jointly and fixedly connected with a furnace body, and the lower end of the furnace body is fixedly connected with a collecting hopper. The lower end of the collecting hopper is fixedly connected with a blow-off pipe, one end of the furnace body is provided with a rotating mechanism, the rotating mechanism comprises a second rotating shaft, the outer side of the second rotating shaft is provided with a swinging mechanism, the front end of the workbench is fixedly connected with a fixing plate, and the upper end of the fixing plate is provided with a lubricating mechanism. And through mutual cooperation of a fourth rotating shaft and a worm, a fixing sleeve drives a mounting shell to rotate, movement of a third rotating shaft is achieved, all-directional ventilation of blades to the interior of the furnace body is facilitated, and the ventilation effect is improved.

The gas quenching system comprises a gas quenching furnace, a plurality of gas inlet holes are formed in the gas quenching furnace wall of the gas quenching furnace, a multi-dimensional partition regulation and control mechanism is arranged on the gas quenching furnace wall of the gas quenching furnace, and a plurality of gas inlet holes are formed in the gas quenching furnace wall of the gas quenching furnace. The multi-dimensional partition regulation and control mechanism can be used for performing partition regulation on the air inflow of the corresponding air inlet holes in the air quenching furnace to realize partition cooling; a plurality of adjustable rotary nozzles are arranged on the furnace wall of the gas quenching furnace and correspond to the gas inlet holes, and the adjustable rotary nozzles can rotate to realize directional cooling; the automatic control system is used for controlling the multi-dimensional partition regulation and control mechanism to carry out partition flow regulation and is used for controlling the adjustable rotary nozzle to dynamically adjust the spraying direction of the nozzle; the multi-dimensional regulation and control zoning mechanism and the adjustable rotary nozzle are integrated, zoning air volume regulation and control and precise air direction regulation and control can be achieved, precise regulation of the air volume is achieved, and the situation that the local temperature is too high is eliminated.

The present invention relates to a method for recovering unreacted iodine using an unreacted iodine recovery device comprising: a gas quenching device comprising a hollow cooling body into which a reaction gas mixture containing iodine (I2) discharged from a trifluoroiodmethane (CF3I) manufacturing process by the reaction of trifluoromethane (CF3H) and iodine (I2) is supplied to one side of the upper portion, and a first injection unit into which cooling water is sprayed from the upper portion of the cooling body; and a filtration device comprising a hollow filtration body having a filter with a plurality of through holes formed in the lower portion of the gas quenching device, and a second injection unit into which cleaning water is sprayed from the upper portion. A cooling step in which a high-temperature reaction gas mixture is supplied to the above-mentioned cooling body and cooling water is sprayed from the first injection part to cool the reaction gas mixture and gaseous iodine (I2) is precipitated, and The above aqueous solution and solid iodine (I2) flow into a filtration device and undergo a filtration step in which the aqueous solution and iodine (I2) are separated by a filter, and The present invention relates to a method for recovering unreacted iodine, characterized in that the iodine (I2) filtered by the above filter is cleaned by spraying cleaning water from a second spraying unit.

The application relates to an alloy skin forming die and method, and belongs to the technical field of metal plastic working, and solves the problems of low profile precision, poor integrity and high cost of an alloy skin in the prior art. The alloy skin forming die comprises an upper die and a lower die, and further comprises a gas quenching die. The alloy skin forming die provided by the application can be used for aluminum alloy local large deformation skin forming, an aluminum alloy local large deformation skin is prepared through a friction stir processing / fluid forming method, the manufactured aluminum alloy local large deformation skin has high precision and good integrity, and the aluminum alloy local deformation capacity can be improved. The alloy skin forming die provided by the application can also be used for aluminum lithium alloy skin forming, an aluminum lithium alloy skin is prepared through a superplasticity / gas quenching forming method, and finally, the aluminum lithium alloy skin not only has high profile precision, but also has high tensile strength performance, the process flow is simple, the processing cost is low, and the aluminum lithium alloy skin has good integrity and consistency.

The present invention relates to a quenching device, and an object of the present invention is to provide a quenching device and a quenching method capable of effectively performing gas quenching using hydrogen gas. Disclosed is a quenching device provided with: a quenching chamber in which a material is blast-cooled using hydrogen gas; a heat exchanger for cooling the hydrogen gas; a first pipe for supplying the hydrogen gas discharged from the quenching chamber to the heat exchanger; and a second pipe for supplying the hydrogen gas cooled by the heat exchanger to the quenching chamber.

The utility model discloses a high-pressure gas quenching vacuum furnace for heat treatment of metal pieces. The high-pressure gas quenching vacuum furnace comprises a support frame; the bottom of the machining mechanism is fixedly connected with the top of the supporting frame, the machining mechanism comprises a high-pressure gas quenching vacuum furnace body, a fixing opening, a limiting ring and a cover plate, the right side of the top of the high-pressure gas quenching vacuum furnace body is fixedly connected with the fixing opening, and the top of the fixing opening is slidably connected with the limiting ring. The small air cylinder, the limiting plate, the cover plate, the nut, the screw, the fixing plate, the cooling plate, the L-shaped plate, the cooling fan and the connecting plate are used in cooperation, the small air cylinder is started to drive the limiting plate to move upwards, the limiting plate moves upwards to drive the cover plate to move upwards, the screw is detached through the nut, and the fixing plate is moved upwards to drive the fixing plate to be away from the cooling plate. And the fixing plate moves upwards to drive the L-shaped plate, the cooling fan and the connecting plate to move, so that the safety of the high-pressure gas quenching vacuum furnace is improved.

This invention provides a high surface hardness gear steel for new energy vehicles, its production method, and heat treatment process. The composition is: C 0.25-0.30%, Si 0.25-0.45%, Mn 1.15-1.35%, P ≤0.015%, S ≤0.015%, Cr 1.11-1.27%, Mo 0.7-1.00%, Al 0.025-0.035%, Ti 0.03-0.05%, Ni 1.4-1.6%, Cu ≤0.2%, [N] 30-50ppm, TO ≤15ppm, [H] ≤1.5ppm, with the remainder being Fe and unavoidable impurity elements. After isothermal normalizing pretreatment + carburizing gas quenching + low-temperature tempering, the carburized layer grain size is ≥10.0 grade, and the surface hardness is ≥800HV. 10 ≥3.0×10 7 L 50 ≥6.5×10 7 This meets the requirements of new energy vehicles for high contact fatigue performance.

A method of implementing a heat treatment process for enhancing strength of a part is provided. The method includes applying, by a controller, a gas quenching process to enable a controlled operation for cooling the part wherein the part comprises a steel material wherein the controlled operation for cooling the part is a subsequent action in the heat treatment process applied after the steel material of the part has been heated to a critical temperature. Also, controlling, by the controller, the cooling of the steel material of the part in the gas quenching process by affecting of changes in a cooling rate over one or more increments of time for the cooling of the part that results in at least an increase in value of an Ultimate Tensile Strength (UTS) of the steel material in correspondence with a decrease in the cooling rate by the controller.

The present specification relates to a gas cooling unit, comprising: a chamber; at least one opening in the chamber, leading to a processing space inside the chamber; at least one door, which is used to close the opening; and a system (4) located inside the chamber, which includes at least one wall (42), which is movable between a first position and a second position, in which the wall forms a barrier between the opening and the processing space, and in which the wall enables a passage from the opening to the processing space to be unobstructed.