34results about How to "Guaranteed hardness requirements" patented technology

The invention discloses a heat treatment deformation control method for spring sheet parts, which belongs to the field of heat treatment deformation control. The method is as follows: ①Quenching the parts after cold forming; ②Put the spring piece into the shape-correcting fixture, fix it with appropriate pre-tightening bolts, and temper them together at the specified temperature; ③Tighten the bolts fully after half the tempering time, Put it into the furnace again and heat until the tempering process is over. The invention has the advantages that the method of fixture shape maintenance and heat correction can effectively correct the distortion and deformation of the spring sheet after quenching, ensure the corresponding structure and hardness requirements, and achieve the purpose of heat treatment shape control.

The invention relates to a heating treatment process for scale production of gear blanks and a corresponding heating treatment production line. The invention eliminates the integral recrystallization heating of the gear blanks, and gears can stably obtain a metallographic structure with excellent cutting performance and an expected hardness value no matter using a forging waste heat isothermal annealing process or an isothermal annealing process conducted after the blank is cooled of the invention.

An environment-friendly magnesian dry material comprises sintered magnesia, fused magnesia, calcium forsterite, a binding agent, aluminum hydroxide micro powder, a high-temperature sintering agent, anexpanding agent, floating beads and bentonite in a mass ratio of (60-75): (20-30): (8-10): (15-25): (8-12): (2-4.5): (1-2): (0.5-1.5): (0.8-1.2). According to the invention, the proportion of each component of the dry material is optimized; by adopting the environment-friendly binding agent, the problem that the binding agent is decomposed into toxic and harmful substances under a high-temperature condition can be effectively solved, the dry material is more energy-saving and environment-friendly, the hardness requirement of the dry material in the using process can be ensured on the premisethat the dry material has no pungent smell in the using process and is more beneficial to the production environment, and the scouring resistance of the dry material is ensured.

The invention provides a flexible cover plate and a flexible display screen, and the flexible cover plate comprises a composite layer which comprises first flexible glass, second flexible glass, and atransparent organic filling layer; a polymer material layer formed on the composite layer; and a hardened layer which is formed on the polymer material layer and is far away from one side of the composite layer; wherein in the bending area, the first flexible glass comprises a first base part and a plurality of first protrusions regularly arranged on the first base part, and the first protrusionsare arranged on the side close to the second flexible glass; the first flexible glass and the second flexible glass are oppositely arranged to form a gap, and the gap between the first flexible glassand the second flexible glass is filled with the transparent organic filling layer. The first flexible glass and the second flexible glass guarantee the hardness requirement of the flexible cover plate, meanwhile, in the bending area, the transparent organic filling layer improves the flexibility and bending resistance of the flexible cover plate, and the risk that the flexible cover plate cracksdue to stress concentration in the bending process of the flexible display screen is avoided.

The invention discloses steel for an inner raceway of a constant velocity universal joint and a production method thereof. The steel comprises, by weight, 0.15-0.25% of C, 0.01-0.15% of Si, 0.25-0.75% of Mn, 0.80-1.30% of Cr, 0.001-0.003% of B, 0.010-0.040% of Ti, less than or equal to 0.015% of S, less than or equal to 0.025% of P, less than or equal to 0.25% of Ni, less than or equal to 0.20% of Mo, less than or equal to 0.30% of Cu, less than or equal to 0.05% of Al, less than or equal to 0.0010% of Ca, less than or equal to 0.0010% of O, less than or equal to 0.04% of As, less than or equal to 0.03% of Sn, less than or equal to 0.005% of Sb, less than or equal to 0.002% of Pb and the balance Fe and inevitable impurities. The production process comprises the steps of carrying out primary smelting, carrying out refining, carrying out vacuum degassing, carrying out continuous casting, carrying out continuous rolling, carrying out annealing and carrying out finishing. The hardness of the steel is less than or equal to 80HRB; the microscopic structure is ferrite and pearlite; the austenite grain size of the steel is greater than or equal to 6 grade; the banded structure of the steel is graded according to GB/T 13299 and does not exceed 2.0 grade. The hardenability of the tail end of the steel is evaluated according to a GB/T 225 method, and the hardenability of the J5 point is 36-44 HRC, and the hardenability of the J13 point is 24-32 HRC. The steel for the inner raceway of the constant velocity universal joint belongs to novel carburized steel for a universal joint inner raceway, and meets the hardenability, wear resistance and cold forging performance of the steel for the universal joint inner raceway.

The invention discloses an aluminizing method of a GH4049 ball. The aluminizing method comprises the steps of firstly, carrying out solid solution treatment on a GH4049 blank; then, processing the blank subjected to solid solution treatment into a semi-finished product with a spherical surface D; and finally, carrying out aging treatment on the entire semi-finished product while carrying out aluminizing on the spherical surface D of the semi-finished product at the aging temperature. According to the aluminizing method, the hardness is guaranteed to reach HB285 to HB352 while the depth of an aluminized layer is guaranteed to be 30 [mu]m to 50 [mu]m.

The invention relates to an engine case machining process. The engine case machining process comprises the following steps: (1) raw material formation: a raw material is cleaned and dried, and is formed by plastic deformation; the formed material is rolled into a cylinder according to the size by a pipe rolling machine; and parts at other portions of an engine case are machined on a lathe; (2) welding: the cylinder is cleaned, dried and fixed; the welded surfaces of the cleaned cylinder with other parts of the case are polished and cleaned; and then seamless welding is performed after drying; (3) detection: the condition whether the case formed after welding has cracks and defects is detected; and the precision of the case and the condition that whether weld seams exist are checked; and (4) finish machining: the surface of the case is polished to remove an oxidation layer; then, primer and finishing coat are sprayed; and the lettering is performed. The machining process can guarantee the precision and the quality of the engine case, and improves the production efficiency.

The invention discloses an abrasion-resistant counter sinking cutter, which comprises a cylindrical cutter handle and a cutter bar; a rectangular main blade fixing groove is formed in the middle of the lower end face of the cutter bar; a first L-shaped gap is formed on the lower end face of the cutter bar and positioned on each of two sides of the main blade fixing groove; a main blade is arranged in the main blade fixing groove; a main cutting edge gradually approaches to the axis of the cutter bar from the outer side of the main blade to the center of the main blade so as to form an inclined shape; a second L-shaped gap extending axially along the cutter bar and communicated with the main blade fixing groove is formed on each of two sides of the lower end face of the cutter bar and is close to the main cutting edge, so that a chip removal groove of the main cutting edge is formed; a secondary blade is arranged on a lateral surface of each first L-shaped gap; an end cutting edge is formed at the end of each secondary blade; a lateral cutting edge is formed on the outer lateral surface of each secondary blade; and the end cutting edges are 0.1 to 0.2 millimeter shorter than the main cutting edge in the axial direction. According to the cutter, the service lives of the cutting edges are long; the size precision of the cutter is high; the cutter bar has high strength; and the cutter is high in cutting efficiency and easy and convenient to manufacture, install and maintain.

The invention discloses a forging process capable of preventing forging cracking of 11Cr17. The forging process capable of preventing forging cracking of 11Cr17 can replace an existing forging process, the cracking probability of 11Cr17 tooth head forgings in the machining process is reduced, and the performance of the tooth head forgings is improved. The specific operation includes the following steps that firstly, raw materials are prepared, a lathe is used for conducting turning operation on an existing rod body raw material with the diameter being 30 mm, then a rod material with the diameter being 28.5 mm is obtained, after that, a sawing machine is used for conducting blanking operation on the rod material with the diameter being 28.5 mm, a section of rod body raw material with the length value being 40 mm is obtained, and finally surface treatment is conducted on the two ends of the rod body raw material. According to the forging process capable of preventing forging cracking of 11Cr17, turning pretreatment is conducted on the initial rod body raw material, cracks on the surface of the raw material are effectively removed, forging cracks caused by the cracks of the raw material are prevented in the later period. Rounding treatment is conducted on the two ends of the single rod body raw material obtained through blanking, so that the material flowability is improved, and the machining problems of overburning of sharp burrs, folding, inclusion and the like are prevented.

The invention discloses a bending axis used for shaping an underclothes back buckle which relates to a shaping die for the underclothes back buckle of a woman. The bending axis consists of a bending axis body, a pressing wheel and a mandrel; the pressing wheel is in a disc shape and arranged in a notch of the head part of the bending axis body; part of the pressing wheel reveals outside the notch; besides, the pressing wheel and the mandrel fixed on the bending axis body form a rotatable fit. The pressing wheel and the bending axis body are component of different materials; the mandrel and the bending axis body are pivoted and pressed into a whole. The bending axis is used for shaping and processing the underclothes back buckle (hook shape piece, circle shape piece); has little friction when being bended; can not damage a workpiece membrane layer and improve the quantified rate of products; besides, the bending axis is easy to be manufactured and saves the steels with excellent quality; after the service life becomes due, the pressing wheel can be replaced, thus avoiding being integrally wasted and greatly reducing the manufacturing and using cost.

The invention discloses an annealing process for comb teeth of a turbonator. Materials of the comb teeth, an annealing method, annealing process parameters and a comb tooth production procedure conducted after annealing are stipulated in the annealing process; and the annealing process is implemented according to the stipulation so that it can be guaranteed that the product quality of the comb teeth meets the requirement of a design drawing.

The invention provides a method of guaranteeing hardness of welded closed impeller after welding. The method is characterized in that aluminium alloy closed impeller, after a conventional machining and welding, is taken out of a salt bath furnace, put into a boiling water of 100 DEG C for fried salt treatment within two minutes, with a time being controlled in 30-50 minutes, and then is subjected to an artificial aging for 10-12 hours under a temperature of 160-180 DEG C, so that the hardness HB of the aluminium alloy closed impeller after welding is more than or equal to 100.

The invention discloses an independent oil supply sliding bearing with changeable pads. The independent oil supply sliding bearing comprises a bearing body and the pads which are concentric, wherein the bearing body comprises an inner contact surface provided with a plurality of grooves, each pad comprises an outer arc-shaped plate, each outer arc-shaped plate comprises an outer contact surface which is in seamless contact with the inner contact surface, a boss which is in interference fit with the groove is arranged on each outer contact surface, an inner arc-shaped plate is fixedly connected at the midline on the inner side of each outer arc-shaped plate, and the pads are symmetrical by taking the central axis of the bosses as the symmetrical axle; the number of the grooves corresponds to that of the pads; and a plurality of oil inlet rods are distributed on the bearing body and penetrate through the bearing body. According to the independent oil supply sliding bearing disclosed by the invention, only the pads which are simple in structure and low in cost need to be replaced; furthermore, the processing precision is reduced, and the using requirements can be met by only ensuring the processing precision and the hardness requirements on the contact surface between each pad and the bearing; and the oil inlet rods are simple in structure and convenient to mount, and a gap between each oil guide rod and a shaft can be adjustable.

The invention relates to a chafing dish bottom material and a making method thereof. The chafing dish bottom material comprises the following raw materials of beef tallow for the chafing dish bottom material, a thick broad-bean sauce, old ginger, garlic, Ciba hot peppers, a soybean sauce similar with fermented soya beans, red peppercorns, edible oil, yellow wine, spice, pepper fruits, edible salt, white sugar, monosodium glutamate, I+G, chafing dish mate, ethyl maltol, chive oil, oil for a spiced chicken with a chili sauce, and flavored protein cream. The making method comprises the following steps of I, putting the beef tallow for the chafing dish bottom material in a bottom material pot, and performing melting to obtain a mixture I; II, putting the Ciba hot peppers to the mixture I in the step 1 to obtain a mixture II; III, adding the thick broad-bean sauce, the old ginger, the garlic, the soybean sauce similar with fermented soya beans and the yellow wine to the mixture II in the step II to obtain a mixture III; IV, adding the edible salt and the white sugar to the mixture III in step III to obtain a mixture IV; step V, adding the red peppercorns to the mixture IV in step IV to obtain a mixture V; step VI, heating the edible oil, and sprinkling the heated oil to the mixture V in step V, and turning off the fire to obtain a mixture VI; step VII, adding the chafing dish mate to the mixture VI in step VI; VIII, adding the ethyl maltol to the mixture VII in step VII to obtain a mixture VIII; step IX, adding the chive oil, the oil for a spiced chicken with a chili sauce and the flavored protein cream to the mixture VIII in step VIII to obtain a mixture IX; and step X; adding the monosodium glutamate and the I+G to the mixture IX in step IX. The scheme not only can guarantee the color of the chafing dish bottom material, but also can guarantee the hardness of the chafing dish bottom material.