41results about How to "No machining required" patented technology

The invention provides a method for preparing a high-density special-shaped pure tungsten product through low-temperature sintering, and belongs to the technical field of powder injection molding. The method comprises the technological processes that an air flow mill is adopted for carrying out dispersing and staging treatment on commercially available high-purity tungsten powder, the treated powder and a bonding agent are evenly mixed for mixing, and even feed is obtained; the feed is subjected to injection molding to form a blank in a certain shape; and the formed blank is subjected to solvent degreasing and hot degreasing and then is sintered, and the tungsten product is obtained. Powder is subjected to dispersing and staging treatment through the air flow mill under the protective atmosphere, the powder is driven by gas to collide with each other and can be treated on a large scale, and no impurity is introduced; the particle size distribution of the treated powder becomes narrow, and the shape of particles becomes regular and is similar to a spherical shape; and loose-fitting tap density is increased, the loading amount of the injection-molded powder is correspondingly improved to 55%-70%, and the density of the pure tungsten product manufactured after sintering of the hydrogen atmosphere of 1,900 DEG C is higher than 96%.

Provides small vehicle drives with reduced axial dimensions without increasing the number of parallel shafts. The first electric motor (M1) and the power distributing mechanism (differential part) (16) are arranged on the first axis (CL1) which is the rotation center of the input rotating member (14) in order from the input rotating member (14), automatically The transmission (transmission unit) (20) is arranged on a second axis (CL2) parallel to the first axis (CL1). The transmission member (18), which is a rotating member located on the first axis (CL1) at the end opposite to the input rotating member (14), and arranged on the second axis at the end opposite to the input rotating member (14) Between the first intermediate shaft (rotating member) (40) on (CL2), a driving connection device (23) is provided to be able to transmit power. In this way, the power transmission path becomes a C-shape or a U-shape with reduced axial dimension, which can reduce the size and simplify the structure without increasing parallel shafts.

The invention discloses a precision casting method for a graphite mould-ceramic core titanium alloy. The precision casting method disclosed by the invention comprises the following steps: preparing a ceramic mould core and a graphite mould shell, then, degassing the graphite mould shell and the ceramic mould core, assembling the ceramic mould core and the graphite mould shell to form a casting mould according to a casting mould shell figure, smelting, and casting. The precision casting method disclosed by the invention has the advantages that aiming at a complex three-dimensional variable-curved surface titanium alloy precise casting, a titanium alloy casting is cast by utilizing the precision casting method disclosed by the invention; therefore, the dimensional accuracy, the internal quality and the surface quality of the casting are improved; the rejection rate of the casting is greatly reduced; the casting cost of the casting is reduced; and the production period of the casting is shortened.

The invention discloses a casting method of a pump body. The casting method of the pump body comprises the steps that resin-bonded sand is taken as a raw material; the resin-bonded sand is adopted formanufacturing a sand mould, and a resin-bonded sand mould is manufactured after mould matching and mould assembling; then pouring liquid is prepared, wherein the pouring liquid comprises the following chemical components of 3.0-3.2% of C, 1.8-2.0% of Si, 0.4-0.5% of Mn, 0.08% of P, 0.01% of S, 0.03-0.04% of Mg, 0.01-0.02% of Re, 0.6-0.8% of Cu or 0.04-0.05% of Sn, and the balance Fe; the raw materials in the previous step are heated to a smelting temperature in an electric furnace, an alloy is fully molten into molten iron, and thus the pouring liquid is formed; the pouring liquid is poured into the resin-bonded sand mould, and a casting is formed after the pouring liquid is solidified; and after the casting is cooled wholly, the casting is subjected to sand removal and then heat treatment. With the adoption of the technical scheme, the production efficiency is improved, the production cost is lowered, and the casting quality is effectively ensured.

The invention discloses a vacuum-air pressure casting method of a three-dimensional network ceramic-metal friction composite material. The method comprises the process steps of pretreatment of a three-dimensional network ceramic skeleton, mold treatment and casting of metal. The three-dimensional network ceramic skeleton adopts SiC, B4C, Si3N4, Al2O3, ZrO2 or a mullite ceramic material; and the metal adopts aluminum or an aluminum alloy or a copper alloy or a titanium alloy or a steel and iron material. The pretreatment of the three-dimensional network ceramic skeleton can adopt the surface preoxidation treatment, the inorganic matter modification, the electroplating coating or the powder metallurgy method to diffuse and sinter a layer of high-melting point metal. The casting of the metal is performed in a vacuum-air pressure casting furnace. The method can prepare network ceramic-metal composite materials with different ceramic contents and different three-dimensional network apertures, can realize the compounding of low-melting point metal and three-dimensional network ceramic, and can prepare the three-dimensional network ceramic-metal friction composite material with a continuous bonding interface for the copper alloy or the steel and iron material with a higher melting point.

The invention relates to a method for manufacturing an iron-based alloy part and belongs to the technical field of iron-based alloy forming. According to the method for manufacturing the iron-based alloy part, a powder injection forming technology is adopted; firstly, metal and polymer binder powder are mixed into even injection forming feed with viscoplasticity; then, injection is conducted on an injection machine so that an injection blank can be formed; afterwards, the iron-based alloy part is manufactured through the steps of degreasing, sintering and the like. The finished iron-based alloy part product which is good in performance and high in size precision is obtained after heat treatment is conducted on the sintered product. The method for manufacturing the iron-based alloy part has the advantages that the product is formed with a net dimension, subsequent machining is not needed, the production cost is low, and iron-based alloy part products which are complex in shape and good in comprehensive performance can be produced in a batched mode; and the method is suitable for industrial production.

A circuit board with hollow space portion and method for manufacturing the same, uses two substrates to constitute a hollow space portion therein. The invention includes: a first circuit pattern 17 formed by the conductive foil 20a on the surface of an upper substrate 11, a bonding layer 13 formed on the back of the upper substrate 11, a second circuit pattern 19 formed by the conductive foil 21a on the surface of an lower substrate 12, a hollow space portion 14 formed by removing the conductive foil 21b on the back of the lower substrate 12, and an insulation layer 34 provided surrounding the hollow space portion 14, wherein the bonding layer 13 on the back of the upper substrate 11 is bonded with the insulation layer 34 on the back of the lower substrate 12, a hollow space portion 14 is surrounded by the upper substrate 11, the lower substrate 12 and the insulation layer 34 between the two substrates.

The invention discloses a preparation method of air-cooling lower bainite/martensite complex-phase wear resistant cast steel. Mn is adopted as a main alloy element; small numbers of such alloy elements as Cr, B and rare earth elements (La, Ce, Nb and Pr) are added; and the balance is Fe. The alloy elements are smelted by a conventional steelmaking process, are cast and molded, are austenitized and air-cooled or forced-air-cooled, are heated and insulated, and are tempered with low temperature. The structure of the produced wear resistant cast steel after the air cooling consists of lower bainite/martensite and a small number of granular bainite. The hardness of the cast steel is higher than 50 (HRC); and the no-gap impact energy AK is higher than 50 J. The wear resistant cast steel has the advantages of low alloy element content, excellent toughness fit and wear resistance, simple process and low cost; the preparation method can be used for manufacturing various low-alloy wear resistant cast steel parts; and in particular, the preparation method has unique advantages for the wear resistant cast steel parts with complex shape structures, large sizes and easy rupture properties in quenching.

The invention belongs to the technical field of powder metallurgy and relates to a manufacturing method of niobium alloy parts, in particular to a manufacturing method of small-sized and thin-wall Nb-W-Mo-Zr alloy parts. The manufacturing method uses micro spherical Nb-W-Mo-Zr alloy powder which is treated through mechanical alloying and plasma spheroidizing as raw materials, and uses a method of injection molding to prepare a small-sized and thin-wall Nb-W-Mo-Zr alloy part, wherein the alloy part is characterized in that length is smaller than or equal to 30mm, width is smaller than or equal to 5mm, the thickness of thin wall is smaller than or equal to 1mm, dimensional tolerance is smaller than or equal to 0.09%, and a step structure and an arc structure are included in the alloy part. The method of manufacturing small-sized and thin-wall Nb-W-Mo-Zr alloy parts overcomes the defects of a traditional niobium alloy part manufacturing method, for example, stock utilization is low, pollution is serious, complicated shaped parts cannot be manufactured, and production efficiency is low. The method is suitable for manufacturing small-sized and complicated Nb-W-Mo-Zr alloy parts.

The invention provides an ATR series chassis made of carbon fiber epoxy resin matrix composite material. The composite material ATR series case is prepared by laying up carbon fiber epoxy resin based composite material prepreg, heating, pressurizing and curing. The present invention uses the carbon fiber reinforced material of the new composite material and the resin-based composite material to prepare the ATR series chassis products, which are manufactured by one-time membrane pressing. The product has high processing precision and good consistency, no need for subsequent mechanical processing, high raw material utilization rate, no waste, and is suitable for mass production. Carbon fiber epoxy resin matrix composite material has high strength, flame retardancy and corrosion resistance. The product does not require surface protection treatment, and is suitable for harsh environments such as acid, alkali, and salt spray. Due to the low specific gravity of carbon fiber epoxy resin-based composite materials (aluminum alloy 1.4-1.6g/cm ³ ), the unit weight of the product parts is lighter.

The invention discloses a centrifugal casting process of a high-performance engine alloy cylinder sleeve; the radiating condition in the condensation of a casting melt is improved through optimizing the mold design; tin is added in a traditional cylinder jacket material for alloying; and meanwhile, the total inoculation quantity is reduced, and ladles are properly added for inoculating, so that graphite is more refined, the pearlite stability is improved, and the wear resistance of the cylinder jacket material is improved.

The invention aims to provide a high-strength powder metallurgy brass-based coupler. The high-strength powder metallurgy brass-based coupler comprises the following components by mass percent: 28-32% of Zn element powder, 0.5-0.7% of rare earth element powder and the balance of copper powder and inevitable impurities. The technical problem that the dimensional consistency is difficult to guarantee because many variables exist during traditional machining is solved.

The invention discloses a casting production process for a belt wheel casting; the casting production process disclosed by the invention comprises the steps of manufacturing a mould, manufacturing a sand mould, setting a core, pouring and carrying out subsequent operation in sequence; the casting production process disclosed by the invention is characterized in that the step of manufacturing the sand mould comprises filling the mould by moulding sand, compacting the moulding sand to complete a mould, and simultaneously, setting an air inflation hole in the completed mould; a step of smelting is set between the step of setting the core and the step of pouring; the step of smelting comprises selecting materials according to the casting at first, adding alloy elements into molten iron, inoculating after discharging molten iron, and then, pouring; and the step of pouring comprises injecting molten iron into a cavity and pouring to obtain the belt wheel casting. By means of the casting production process disclosed by the invention, the problems of being more in process and high in workload in processing of the belt wheel casting in the prior art are solved; the production efficiency is increased; the quality defect due to the fact that the belt wheel is processed unqualifiedly is avoided; the utilization rate of raw materials is high; the production cost is reduced; the cast belt wheel is precise in size and unnecessary to machine; and thus, the quality of the casting is effectively ensured.

The invention provides a production process of a 90-degree soft copper bar free of NC machining. The production process comprises the following steps that a, discharging is conducted, copper foils arestacked in order, and thus a first semi-finished product is obtained; 2, one end of the first semi-finished product is aligned and then subjected to diffusion welding, and a second semi-finished product is obtained; 3, the middle of the second semi-finished product is bent by 90 degrees, and a third semi-finished product is obtained; 4, the other end of the third semi-finished product is alignedand then subjected to diffusion welding, and a fourth semi-finished product is obtained; 5, one end of the fourth semi-finished product is punched into a round connector with a square hole, the otherend of the fourth semi-finished product is punched into a round connector with a round hole, and a fifth semi-finished product is obtained; and 6, the middle of the semi-finished product is sleeved with a heat shrink tube to obtain a finished product. Compared with a traditional process that edging clamping and NC machining after diffusion welding are needed in the 90-degree bending process, copper foil stacks can be discharged through a punching die in an equal-length mode, two-step diffusion welding and two-step punching are conducted, operation is easy, efficiency is high, the yield is increased, copper foil loss is small, and cost is relatively reduced.

The invention discloses a powder metallurgy component. The powder metallurgy component comprises, by weight, 100 parts of steel powder, 4-5 parts of copper powder, 1-2 parts of iron sulfide, 1-2 partsof rare earth powder, 1-2 parts of nickel powder, 3-5 parts of calcium fluoride, 0.1-0.3 part of micronized wax, 1.2-1.5 parts of molybdenum powder, 2-4 parts of a forming agent and 0.5-0.9 part of alubricating agent. According to the powder metallurgy component, alloy iron-based powder obtained by fully mixing the steel powder, the copper powder, the iron sulfide, the rare earth powder, the nickel powder, the calcium fluoride, the micronized wax, the molybdenum powder, the forming agent and the lubricating agent is subjected to pressing, sintering, machining, heat treatment and surface vibration grinding treatment, and then a finished product is obtained. Due to the fact that a powder metallurgy machining technology is adopted, the integrated degree is high, large-scale repeated production is facilitated, the surface smoothness is good, cutting machining is not needed, and the advantages of material saving, time saving and the like are achieved.