30results about How to "Dense grain structure" patented technology

The invention relates to a Fe-based austenite alloy oil sleeve, which comprises the following components in percentage by mass: less than or equal to 0.03 percent of C, less than or equal to 0.03 percent of P, less than or equal to 0.03 percent of S, 0.01 to 1.0 percent of Si, 0.01 to 3.0 percent of Mn, 25 to 40 percent of Ni, 20 to 35 percent of Cr, 1 to 5 percent of Mo, 0.1 to 1.5 percent of Cu, 0.01 to 0.5 percent of Al, less than or equal to 0.01 percent of O, and the balance of Fe and inevitable impurities. The 90 to 140 ksi steel-grade Fe-based alloy oil sleeve meeting different well depth requirements of high-acidity oil fields and gas fields is manufactured by thermal extrusion, 1,050-1,180 DEG C of solution treatment and cold rolling of the smelted and forged blanks.

The invention discloses a high-strength and high-toughness heat-treatment-free aluminum alloy material and a preparation method, and belongs to the technical field of aluminum alloy casting. The high-strength and high-toughness heat-treatment-free aluminum alloy material comprises the following components in percentage by mass: 8.0-10.5% of Si, less than or equal to 0.15% of Fe, 0.05-0.3% of Mg, 0.05-0.3% of Zn, 0.3-0.6% of Mn, less than or equal to 0.1% of Cu, 0.05-0.15% of Ti, less than or equal to 0.005% of Ca, 0.005-0.030% of Sr, 0.1-0.3% of Zr, 0.01-0.1% of Mo, 0.01-0.3% of V, less than or equal to 0.02% of Cr, less than or equal to 0.002% of Na, less than or equal to 0.002% of P, less than or equal to 0.01% of Cd, less than or equal to 0.001% of Li, less than or equal to 0.0025% of B, less than or equal to 0.05% of Ga, and the balance Al and inevitable impurities. The alloy does not need to be subjected to heat treatment, and has excellent casting performance and mold filling capacity and good tensile strength, yield strength and toughness.

The invention discloses a production process for a high-precision roller bearing ring, which belongs to the technical field of mechanical manufacture. The production process comprises the following steps of: turning a blank into an annular shape by adopting a machine tool; carrying out a cold rolling expansion process and basically processing and forming the ring; carrying out heat treatment and cryogenic treatment; controlling the quenching hardness (Hardness Rockwell) of the heat treatment to be 60-63 and controlling the cryogenic temperature to be -60DEG C to -90DEG C; carrying out preliminary grinding and fine grinding processes on workpieces subjected to cold rolling expansion process; carrying out grinding processing on a plane, the outside diameter, an inner hole and a channel of the ring to reach the size precision of parts; and finally, carrying out an ultra-fine grinding procedure, i.e. carrying out ultra-fine grinding on the channel of the ring, reducing the roughness and improving the roundness of the channel, wherein the roughness of the channel is smaller than 0.015Ra. According to the production process disclosed by the invention, the flow is simple, the production period is shortened and the production efficiency is improved; and after cold rolling and deforming, a grain structure of a metal material is more compact, a metal streamline is unchanged and no cut-off is generated, thus the fatigue resisting strength of the material is improved.

The invention discloses pulse electrochemical deposition and tissue adjustment processes for a nickel plating copper belt. The process comprises the following steps of: performing pulse plating on a nickel coating; performing subsequent cold machining deformation and vacuum heat treatment processes, and the like. By the pulse electrochemical deposition process, the thickness of the nickel coating deposited on the copper belt and the uniformity of a microscopic structure can be effectively ensured; and by the subsequent cold machining deformation and vacuum heat treatment processes, the comprehensive mechanical property, particularly the bending resistance and the physical property of the nickel plating copper belt can be improved, so that high-quality nickel plating copper belts required in industries such as electronics, batteries, electrovacuum, electric light sources and the like can be possibly processed. The pulse nickel plating and tissue adjustment process is low in required equipment investment, has a simple method, is convenient to operate and is suitable for industrial production.

The invention discloses an integrated type light-weight gear shaft. The gear shaft includes a central shaft part and a gear disc part, wherein the central shaft part is composed of a first shaft section, a second shaft section, a third shaft section, a fourth shaft section and a fifth shaft section, the first shaft section, the second shaft section, the third shaft section, the fourth shaft section and the fifth shaft section are sequentially connected from the left to the right and are coaxially arranged, the central shaft part is of a hollow structure, the inner and the outer diameters fromthe first shaft section to the fourth shaft section are sequentially increased, the inner and outer diameters of the fifth shaft section are less than the inner and outer diameters of the fourth shaftsection, a spherical shaft end is arranged at the end, away from the fourth shaft section, of the fifth shaft section, and a central through hole is formed in the spherical shaft end. According to the integrated type light-weight gear shaft, light-weight technology is adopted, and the invention provides the integrated light-weight gear shaft and a manufacturing technique thereof, manufacturing and machining are convenient, the use ratio of materials is high, energy consumption is low, the finished product has certain stream lines, metal density is high, and the combination properties of the product are excellent.

The invention discloses a cold heading forming process for a seamless chain roller and a punch pin head for cold heading forming bottom punching. The cold heading forming process for the seamless chain roller comprises the steps of feeding, cutting, flat heading, blank heading, inversion, head punching, inversion, secondary punching and bottom punching; the depth of the head punching after the blank heading and the inversion is controlled in a range of 2 to 5 millimeters; and the reserved bottom thickness of the secondary punching after the inversion is controlled in a range of 0.5 to 2 millimeters. The punch pin head for the cold heading forming bottom punching comprises a front head of a cylindrical surface, and the rear part of the front head (10) of the cylindrical surface of the punch pin head is a raised spherical surface (20). By combining the cold heading forming process and the punch pin head, one-time precise cold extrusion forming of workpieces can be finished, staggered metallographic structures in the metal and defective metallic plastic formed metal streamlines are repaired, and the mechanical property of a product is further improved.

The invention relates to an antifreezing hydraulic pump body which comprises a casing and an anti-icing coating arranged on an outer layer of the casing. The casing comprises, by mass percentage, 3.26-3.56% of C, 2.13-2.56% of Si, 0.8-1.5% of Mo, 1.12-1.32% of Cu, 0.56-0.75% of Re, 0.5-1.0% of Ni, 2.15-2.40% of Cr, 0.36-0.45% of Ti, 0.5-0.8% of Mn, 0.5-0.9% of Ni, 0.02-0.05% of Sb, 0.33-0.35% of Sn , 0.43-0.55% of Mg, 0.23-0.26% of V, 0.1-0.3% of rare earth element, less than 0.08% of S, less than 0.04% of P, and the balance Fe. The casing is high in strength, very small expansion and shrinkage can occur under a large temperature difference, the service life of the antifreezing hydraulic pump body is prolonged, and the cost is reduced; titanium element is added, corrosion resistance and strength can be improved, vanadium element is added, crystal grains can be refined during forging, strength, toughness, corrosion resistance, abrasion resistance and impact load resistance of the antifreezing hydraulic pump body can be improved, copper element is added, the crystal grains can be refined, overheating sensitivity and temper brittleness of the antifreezing hydraulic pump body are reduced, and the strength is improved.

The invention discloses a cold forging extrusion concave die. An upper die positioning sleeve is arranged in a fixed guiding ring and moves vertically along the inner wall of the fixed guiding ring under the action of the external force. A nitrogen spring is arranged between the upper die positioning sleeve and a movable upper concave die. The movable upper concave die and a lower concave die aretwo coaxially-engaged axial through hole round sleeves. The movable upper concave die is connected with the fixed guiding ring. The fixed guiding ring is fixed on an upper die frame. The upper die frame is connected with a die frame guiding sleeve. The die frame guiding sleeve is arranged on a guiding column in a sleeving mode and can move vertically along the guiding column under the action of the external force. A bearing block is located at the bottom of the lower concave die. A material ejecting rod perpendicularly penetrates through the bearing block and enters a die cavity of the lower concave die. By means of the cold forging extrusion concave die, a sun wheel is formed, the cutting machining difficulty of a sun wheel of small size is reduced, the production efficiency is high, thematerial utilization rate is high, the processing cost is low, and the tooth surface strength of a first-level transmission gear is improved.

The center shaft for the electric bicycle comprises a center shaft body, the center shaft body is provided with a frame mounting portion, fluted disc fixing portions, prism-shaped structures and frustum structures are arranged on the two sides of the frame mounting portion, each side face of each frustum structure is a slope-shaped face, a slope angle theta is formed between each slope-shaped face and the center axis of the center shaft body, and the fluted disc fixing portions, the prism-shaped structures and the frustum structures are arranged on the center shaft body. The invention further provides a machining process of the center shaft for the electric bicycle, cutting loss is avoided in the machining process, the material utilization rate is increased, light weight of products is achieved, raw materials are saved, the production cost is reduced, the original phosphorus saponification treatment procedure of the surface polluting the environment is omitted, the machining period is shortened, and the machining efficiency is improved. And the production efficiency is improved, and energy conservation and environmental protection are achieved.

The invention discloses a new energy automobile bearing pedestal which comprises a shell. An inner cavity of the shell is sequentially provided with a first cylindrical cavity, a second cylindrical cavity and an upper sealing cover upwards from the end face of the shell, and the inner diameter of the first cylindrical cavity is larger than the inner diameter of the second cylindrical cavity; the part, between the shell end face and the shell upper sealing cover, of the shell outer wall is sequentially provided with a first outer round wall, a second outer round wall and a connecting block arranged on the second outer round wall, and the outer diameter of the first outer round wall is larger than the outer diameter of the second outer round wall; and the shell is of an overall structure andis formed by forging of an aluminum alloy. Metal streamline of the new energy automobile bearing pedestal cannot be cut off, the grain structure is compact, the mechanical property is high, the turning machining amount is greatly reduced due to forging molding, deformation is avoided in the machining process, the product accuracy is high, the material using rate is high, the production period isshort, efficiency is high, and the automobile part mating requirement can be met.

The invention discloses an automobile automatic gearbox gear sleeve and a manufacturing technology thereof. The automobile automatic gearbox gear sleeve comprises a hollow cylindrical body, and the outer wall of the hollow cylindrical body is provided with a large cylindrical section, a medium cylindrical section and a small cylindrical section which are sequentially decreased progressively in outer diameter. The wall of the small cylindrical section is provided with a gear profile. The hollow cylindrical body is formed by forging of a whole structure, a warm-and-cold combined forging method is adopted, an outer gear is formed through cold forging extruding, the production period is short, the material utilizing rate is high, the machining cost is low, the metal flow line is not cut off, the grain structure is compact, the gear surface strength is improved, the mechanical property is high, and the matching requirement of parts of new energy automobiles can be met.