2898results about How to "Improve fatigue strength" patented technology

A wear resistant drill bit of the matrix bodied type has a bit body comprising a tungsten carbide material bound with a binder material, wherein the tungsten carbide material includes at least some tungsten carbide particles of generally spherical shape. The tungsten carbide material includes particles having a relatively hard central core and a softer skin. The skin includes a large proportion of a high temperature phase of tungsten carbide.

The invention discloses a pressure-control type electric pressure cooker. A sealed body is formed by sequentially connecting a pot cover, a seal ring, an inner pot and an outer pot; a plurality of belleville springs, which are provided with opening grooves, are arranged between a heating plate and the outer pot; upper supporting rings are formed by horizontally flanging the small-diameter ends of the belleville springs towards inner sides, and lower supporting rings are formed by the big-diameter ends of the belleville springs; an elastic deformation area is formed by a conical wall parts between each of the upper supporting rings and each of the lower supporting rings; the elastic deformation areas penetrate through the upper supporting rings in a radial direction and extend to conical body parts, and the opening grooves that contour lines projected on a horizontal plane are in a cross form are formed; the opening grooves are of gradually expanded structures with upsides smaller than downsides from openings to bottoms; the lower supporting rings are supported on the bottom of the outer pot; the upper supporting rings are propped against supporting legs of the heating plate; and the supporting legs and the belleville springs are integrally positioned with and connected to the outer pot by virtue of fixed screws. The amount of elastic deformation of the electric pressure cooker is effectively improved by virtue of the belleville springs, and the change in induction pressure of a pressure detection device is more conveniently to be detected, so that the precision and the safety stability of pressure control are improved.

The invention provides a high-strength hot rolling automotive frame steel plate which comprises the following chemical components according to the weight percent: 0.05 to 0.10 of C, less than or equal to 0.10 of Si, 1.1 to 1.85 of Mn, less than or equal to 0.025 of P, less than or equal to 0.0030 of S, 0.015 to 0.060 of Al, less than or equal to 0.0060 of N, 0.015 to 0.050 of Nb, 0.015 to 0.150 of Ti, less than or equal to 0.0050 of Ca and the balance of Fe and inevitable impurities. The invention also provides a manufacturing method of a steel plate, comprising rolling control and cold control processes. By adopting the chemical components and reasonable production process, the yield strength of the hot rolling automotive frame steel plate can reach the grade of 550-700Mpa; and the hot rolling automotive frame steel plate has excellent cold forming performance and higher fatigue strength and is suitable for manufacturing longitudinal beams and cross beams of an automotive frame and other members.

The invention discloses a three-dimensional printing forming material with toughness and high adhesive property. The three-dimensional printing forming material comprises a powder material and an adhesive material and is characterized in that the powder material comprises the following components in parts by weight: 40-85 parts of polyamide resin, 5-40 parts of pigments, 5-30 parts of filler, 1-6 parts of pigment and filler dispersing and wetting aid, 0.1-1.5 parts of flatting agent and 0.1-0.5 part of degassing agent; the adhesive material comprises the following components in parts by weight: 60-95 parts of epoxy resin, 5-40 parts of filler, 1-10 parts of toughening agent, 0.1-1.5 parts of flatting agent, 1-4 parts of pigment and filler dispersing and wetting aid, 0.1-0.5 part of degassing agent and 0.1-0.5 parts of powder flowing aid; and when the three-dimensional printing forming material is used, 1 part by weight of powder material and 0.01-0.5 part by weight of adhesive material are cooperatively used. A solid component printed by using the material disclosed by the invention has the advantages of higher adhesion strength and firmness, good flexibility and scratching resistance.

The invention relates to a manufacturing method of a high-strength automobile aluminum-alloy rim material, which relates to a manufacturing method of automobile fitting materials. The manufacturing method comprises the following steps of: preparing materials; smelting; adding a refiner; adjusting components; refining; casting; quenching; carrying out aging treatment; and packaging to prepare the high-strength automobile aluminum-alloy rim material which comprises 0.4-0.8 percent of Si, 0.8-1.2 percent of Mg, 0.16-0.22 percent of Ti, 0.2-0.3 percent of Zn, 0.6-0.8 percent of Fe, 0.15-0.4 percent of Cu, 0.08-0.32 percent of Cr, 0.1-0.2 percent of Mn, 0.02-0.06 percent of RE rare earth, 0.02-0.06 percent of Zr, 0.02-0.06 percent of Sr and the balance of Al. The invention has reasonable process parameter and simple manufacturing method, and the manufactured aluminum-alloy rim material has the advantages of high strength, good mechanical performance and the like and is suitable for being popularized and used in small, medium and large automobiles.

A method of so-called "ultrasonic" peening is described for peening large sized annular surfaces on thin parts. The method uses a microbead mist vibrated in a chamber with an opening so that the surface that is to be peened makes at least five movements past the opening of the peening chamber during peening so as to reduce deformation of the part.

A pencil-type glow plug for a self-igniting internal combustion engine is described. The pencil-type glow plug includes a plug body in which a combustion chamber pressure sensor is integrated, and a bar-shaped heating element that protrudes out from the plug body at one end, into the combustion chamber of the internal combustion engine. A force-measuring element of the combustion chamber pressure sensor is accommodated behind the heating element, which moves axially under the influence of force. The force-measuring element is sealed against combustion chamber gases by a steel diaphragm made of a stainless precipitation-hardened maraging steel.

The invention aims to provide a rolling bearing that secures a sufficient bearing life economically even when used under such conditions that water from the outside or water formed by moisture condensation may seep into the lubricant or the bearing is affected by the vibrations, and particularly a rolling bearing suited to the electric parts and accessaries of au automobile engine, such as an alternator. To accomplish the object, the hydrogen ion exponent pH of the grease sealed into the inside of the bearing is adjusted in a range of from 7 to 13. For the same purpose, the hydrogen ion exponent pH of the grease is adjusted in a range of from 5 to 13 where a prescribed amount of an organic metal salt or ADTC is added to the grease, where a prescribed amount of an inorganic compound having an average particle size of 2 squarem or smaller is added to the grease, or where a diurea compound containing an aromatic amine or a mixture of the diurea compound is added to the grease as a thickener.

A solid particle erosion resistant surface treated coat is provided by which a solid, particle erosion resistance is largely enhanced and a rotating member is given with an oxidation resistance without deteriorating a fatigue strength. Also, a rotating machine, such as a steam turbine, axial compressor or the like, applied with this coat is provided. The solid particle erosion resistant surface treated coat comprises a nitrided hard layer formed on a surface of base material and a PVD (physical vapor deposition) hard layer of at least one layer formed on the nitrided hard layer by a PVD method. The nitrided hard layer has a thickness of at least 30 μm. The PVD hard layer has a total thickness of at least 10 μm. Deformation of the base material by collisions by solid particles is prevented and crack of the coat comprising the nitrided hard layer formed on the base material and the PVD hard layer formed on the nitrided hard layer is prevented. Thereby, the solid particle erosion resistance is secured, life of the solid particle erosion resistant surface treated coat can be elongated and the oxidation resistance and fatigue strength are enhanced.

Provided is a steel for a mechanical structure, which comprises, by mass%, 0.40% to less than 0.75% of C, 0.01% to 3.0% of Si, 0.1% to 1.8% of Mn, 0.001% to 0.1% of S, greater than 0.1% to 1.0% of Al, 0.001% to 0.02% of N, no more than 0.05% of P, and residual Fe and inevitable impurities as the balance, and which satisfies 139.38<=214[C]+30.6[Si]+42.8[Mn]-14.7[Al]<=177 and 0.72<=[C]+1 / 7[Si]+1 / 5[Mn]<1.539.

Provided is a carburized component having excellent fatigue strength in the "low-to-mid-cycle regime." Said carburized component comprises a steel having a chemical composition as follows: the base steel contains 0.15-0.25% carbon, 0.03-0.50% silicon, more than 0.60% and up to 1.5% manganese, no more than 0.015% phosphorus, 0.006-0.030% sulfur, 0.05-2.0% chromium, no more than 0.10% aluminum, no more than 0.03% nitrogen, and no more than 0.0020% oxygen; the steel also contains specific amounts of molybdenum, copper, nickel, boron, titanium, niobium, and / or vanadium as necessary; and the remainder comprises iron and impurities. The surface hardened layer of the carburized component fulfills the following conditions: (a) the mean carbon concentration up to a depth of 0.2 mm from the outermost surface is between 0.35% and 0.60%; (b) the surface roughness Rz is at most 15 [mu]m; and (c) the compressive residual stress at the outermost surface of the component is no more than -800 MPa, thecompressive residual stress 100 [mu]m from the outermost surface of the component is no more than -800 MPa, and Ir is at least 80,000, where Ir is the integral of sr(y) dy from 0 to 100, y being the depth in [mu]m from the outermost surface of the component up to a depth of 100 [mu]m and sr(y) being the residual stress at a depth y.

A cemented quenching heat treatment method of automobile engine gears comprises a step of carrying out cemented quenching treatment on the forged, pre-heated, machined and hobbed gears. Cemented quenching treatment comprises the following steps that (a) the gears are arranged in a tooling set with a middle round rod in a stacked manner, a cover plate is configured above the gears, and a gear string is formed; (b) multiple gear strings are fed into an Aichelin5 / 3 type multi-purpose furnace to be carburized and quenched, wherein the carburizing and quenching step specifically comprises the stages that firstly, the gear strings are heated to 800 DEG C, then, heat preservation is carried out on the gear strings for 0.2 hour, the carbon potential is 0.3 percent; then, the gear strings are heated to 900 DEG C to be carburized, the strong carburization potential is 1.1 percent, the strong carburization time is 130 minutes; the gear strings are subjected to diffusion, the diffusion carbon potential is 0.7 percent, and the diffusion time is 90 minutes; the gear strings are cooled along with the furnace temperature, and are cooled to 810 DEG C, heat preservation is carried out on the gear strings for 0.2 hour, the carbon potential is 0.7 percent; the gear strings are fed into a front chamber to be quenched, the quenching oil temperature is 50 DEG C, the quenching time is 20 minutes, rapid stirring reaches 1200r / min and the time is five minutes, slow stirring reaches 1100r / min and the time is 15 minutes; and the quenched gear strings are taken out of the furnace; (c) the quenched gear strings taken out of the furnace are cleaned, and low-temperature tempering is further carried out.

The invention relates to the technical field of metal hot processing, in particular to the technical field of production device and production technology for non-quenched and tempered steel forge piece automatic forging. The device comprises a forging system, a feeding system and a discharging system, wherein the feeding system is arranged at the front end of the forging system, the discharging system is arranged at the rear end of the forging system, the forging system comprises an electric heating furnace connected with rear part of the feeding system, a forging pressing machine is connected with the rear part of the electric heating furnace, an edge trimmer is connected with the rear part of the discharging system, and the discharging system is connected with the rear part of the edge trimmer. According to the device provided by the invention, defects in the prior art is overcame, the full automatic line technology that the forge piece is heated once and is controlled by one worker is realized, is energy-saving and cost-reducing, labor saving, the outer surface and the inner quality of the forge piece is improved, and the service life is prolonged; as the mechanical property of each part of the forage is close to one anther, the forge piece quality and safety performance are improved, and the non quenched and tempered steel forging piece is high in tensile strength, fatigue strength and machinability.

There is provided a high-pressure fuel pipe for diesel engines, which is excellent in inner-pressure fatigue resistant property, vibrational fatigue resistant property, cavitation-resistant property, seat surface crack resistant property, and bending shape stability, and capable of thinning and lightening. A high-pressure fuel pipe for diesel engines, composed of a low alloy transformation inducing plastic type strength steel containing residual austenite of 5 to 40 wt %, and wherein an inner surface of a flow passage has a crack depth of 20 μm or less, and plastic working is applied to an inner surface of a flow passage.