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676 results about "Cold treatment" patented technology

Treatments for Common cold: Treatment of the common cold starts with prevention. Preventive measures include covering the mouth and nose with an elbow or a tissue when coughing or sneezing and washing hands frequently with soap and water for at least 15 seconds. Antibacterial cleaners can also be effectively used to clean hands and surfaces.

Production method for dedicated steel ball for bearing of high-speed high-precision numerical control machine tool

The invention discloses a production method for a dedicated steel ball for a bearing of a high-speed high-precision numerical control machine tool. The method comprises the following steps of steel ball cold heading, namely machining blank by sleeve cutting, shaping, cold heading multi-station and high-speed cold heading ways; rough machining by adopting a macrocyclic light bulb technology; performing controllable atmosphere quenching, cold treatment and tapering treatment by adopting a continuous drum furnace, automatically controlling carbon potential; surface strengthening by adopting a frequency conversion speed adjusting multi-beating-plate structure; hard grinding by adopting a ceramic sand wheel to perform macrocyclic process to machine; after primary grinding, adopting double-roller sorting; after fine grinding, performing photoelectric eddy current test; performing ultra-fine grinding machining after aging treatment; and performing photoelectric detection after ultra-fine grinding. The diameter variation of the steel ball which is machined and produced by the method provided by the invention is less than 0.07 micron, the roundness is less than 0.05 micron, the spherical error is less than 0.05 micron, the surface roughness Ra is less than 0.07 micron, the variation of the diameter of the ball lot is less than 0.09 micron, and the bearing dmn value of the steel ball after being sleeved is more than 2.5*10<6> mm*r / min.
Owner:SHANDONG DONGE STEEL BALL GRP

Technology treatment method of machining deformation of long and thin hole shaft type thin-wall part

InactiveCN103331651AImprove rigidityReduce unstable retained austeniteFurnace typesHeat treatment furnacesCold treatmentTempering
The invention provides a technology treatment method of machining deformation of a long and thin hole shaft type thin-wall part, and aims at providing a technology treatment method of the machining deformation, which is simple in flow, and high in machining precision and yield. The method adopts the following technical scheme that the method comprises the steps that the long and thin hole shaft type thin-wall part after mechanical rough machining and carburizing treatment is subjected to quenching heat treatment, subzero treatment and low temperature tempering treatment. During the quenching heat treatment, the quenching cooling time is 8-11S/mm; when a surface temperature of the part falls to 30-50 DEG C, the part is lifted up from oil; the surface temperature of the part rebounds in air after some time; and when the part is cooled to 30-50 DEG C again, residual oil is rinsed cleanly by hot water greater than or equal to 60 DEG C. During the subzero treatment, the part is transferred to a -70 DEG C to -80 DEG C refrigerator box to be refrigerated for 2-2.5h within 1h after quenching, and then subjected to air cooling for 60-90min till the part reaches a room temperature. During the low temperature tempering treatment, the part is subjected to heat preservation for 3-4h at 160-180 DEG C and the air cooling. The method solves the problem of the machining deformation of the long and thin hole shaft type thin-wall part due to heat treatment stress, grinding stress and the like, and the yield reaches 100%.
Owner:SICHUAN LINGFENG AVIATION HYDRAULIC MACHINERY

Manufacturing process of ultra-long blade complex curved surface integral impeller made of aluminum alloy material

InactiveCN105904169AManufacturing process improvements and enhancementsComplete shapeOther manufacturing equipments/toolsNumerical controlCold treatment
The invention relates to a manufacturing process of an ultra-long blade complex curved surface integral impeller made of an aluminum alloy material. The manufacturing process includes the specific steps of preparing materials, conducting rough machining on the profile of an impeller workblank, conducting heat treatment, conducting artificial aging, conducting semifinishing on the profile of the impeller, conducting ice-cold treatment, drilling a positioning hole, conducting five-axis linkage rough machining, conducting natural aging, conducting five-axis linkage finish machining, conducting clamp treatment, conducting numerical control turning, conducting linear cutting, conducting clamp treatment and conducting dynamic balancing. By the adoption of the process technology method, the ultra-long blade complex curved surface integral impeller made of the aluminum alloy material is manufactured, the blade shape of the ultra-long blade complex curved surface integral impeller made of the aluminum alloy material is complete, deformation is small, the blade lines of the blade faces of blades are smooth, mass reduction in dynamic balancing is small, and the yield is high; and process improvement in the integral impeller part of the structure is achieved, product quality is guaranteed effectively, the design requirement is met effectively, the stability of production quality is improved, and the reliability of products is guaranteed.
Owner:SHANGHAI INST OF TECH

Heat treatment method of bearing

ActiveCN102758073AExtended service lifeControl of retained austenite contentFurnace typesHeat treatment furnacesAusteniteQuenching
The invention relates to a heat treatment method of a bearing. The heat treatment method comprises the following six steps of: heating, insulating, quenching, cleaning, cold treatment and tempering. The heat treatment method is characterized in that before the heating step, a fining treatment step of carbide is arranged; the fining treatment step comprises two steps of forging and spheroids annealing; the temperature of initial forging in the forging steps is 1050-1150 DEG C; the insulating time is 70-90 minutes; the temperature of the final forging and forming is 800-900 DEG C; then the stirring and cooling are carried out in boiling water till the temperature is 300-600 DEG C; the bearing is taken out of water and air-cooled till room temperature; and the spheroids annealing step comprises specific steps of: heating to 790-810 DEG C, insulating for 150-210 minutes under the temperature, air cooling to 680-710 DEG C, insulating for 4-6 hours, cooling till 650 DEG C along with a furnace, taking out of the furnace and carrying out air cooling. The cold-treatment step is carried out in 2 hours after the cleaning steps is finished after quenching, liquid nitrogen is adopted as cooling medium, cooling is carried out till the temperature is minus 70-minus 80 DEG C, insulation is carried out for 1.5-2 hours under the temperature, and returning the temperature naturally till the room temperature. The heat treatment method has the advantage that the service life of the bearing is prolonged by fining carbide particles, improving the hardness and controlling the content of the retained austenite in the metallographic structure.
Owner:汇洲智能技术集团股份有限公司 +1
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