55results about How to "Reduce machining workload" patented technology

The invention relates to a forging process of a bearing ring. The process includes following steps that: 1) in first firing, a medium-frequency induction heating furnace is adopted to heat an ingot to 1200 DEG C, dead head pressing, chamfering and sprue filing are performed; 2) in second firing, re-heating, upsetting and drawing out are performed on the machined ingot; 3) in third firing, re-heating, upsetting, rotary flattening, punching and reaming are performed on the machined ingot; 4) in fourth firing, the machined ingot is re-heated, and upsetting is performed on the machined ingot in a mold ring, so that the machined ingot can be in a technique size, the mold is removed, and reaming is performed on the machined ingot, so that the machined ingot can be in a technique size, and total forging ratio is controlled to be larger than 5; 5) groove turning is performed, the machined ingot is subjected to cold rolling and reeling on a closed shaping and reaming machine, and rolling paths and chamfered angles are molded with one step, truing is performed, and two end surfaces are subjected to soft grinding; 6) the machined ingot is pre-heated to 800 DEG C to 850 DEG C, after crack detection is performed, when the temperature of the machined ingot is lower than 450 DEG C, the machined ingot is put into the furnace so as to pre-heated to 600 DEG C to 650 DEG C, and heat preservation is performed on the machined ingot, and the machined ingot is put in to the furnace of which the temperature ranges from 950 DEC C to 1000 DEC and is rapidly heated to 1140 DEC C to 1200 DEC C, and water quenching is performed, and instantly, tempering from 550 DEC C to 600 DEC C is performed on the machined ingot, and the machined ingot is cooled to 400 DEC C to 450 DEC C in the furnace, and the machined ingot is taken out from the furnace and cooled. With the forging process adopted, inherent defects of metal can be eliminated, and the service life of a bearing can be prolonged.

The invention provides a rolling piston used for a rotary refrigeration compressor and the manufacture method thereof. The material of the rolling piston is a precise steel pipe made of GCr15 bearing steal cold rolled; the manufacture method of the invention is that (1) the GCr15 bearing steal is selected to be cold rolled to the steel pipe meeting required internal diameter, external diameter and thickness of the rolling piston; (2) the steel pipe is cut according to the length of the rolling piston material; (3) the cut steel pipe is disposed by hot controllable gas; (4) all surfaces of the steel pipe are kibbled; (5) the steel pipe is disposed by heat stabilization; (6) all surfaces of the steel pipe are finely grinded. The invention has the advantages that the made rolling piston has obvious predominance on the anti-wear performance and high contact fatigue life. The work load of the cutting process can be reduced by 50%, and the utilization ratio of the steel material can reach more than 90%, thus reducing the manufacture cost. The invention saves the casting method, avoids the environmental pollution and high energy consumption, and is a good energy-saving method with environmental protection.

Provided is a rolling piston for a rotary type refrigeration compressor. The rolling piston is made of a steel tube which is formed by conducting cold-rolling on carburizing steel. Chemical components of the carburizing steel include 0.17%-0.23% of C, 0.17%-0.37% of Si, 0.80%-1.10% of Mn, 1.00%-1.30% of Cr, 0.04%-0.10% of Ti and the balance Fe. The rolling piston has the advantages that the supply of goods is ample, the price is low, the cost is reduced, and the environment is not polluted.

The invention discloses a forging technology for synchronous waste-removing and weight-reduction of a forge piece, and belongs to the technical field of forge piece processing. A weight-reduction partand an installation hole part of the forge piece can be achieved in the forging process; by installing a fractional punching mechanism in an existing precision forging die, the forge piece can be directly formed at a time in the forging process based on a thermal stress principle and a plastic deformation rule of the forge piece, and local deformation of the forge piece is prevented. Wastes are removed at a time, the machining difficulty and cumbersome operation brought by a machining process after forging are avoided, and the cost is further reduced; moreover, punching burrs on a non-machining surface can be avoided, and the whole machining workload is reduced; assisted by precise temperature control in the whole process, the shape of the flange hub forge piece can be obtained, dimensional deviations are not likely to be produced, structures in metal can be improved, the mechanical performance and the physical performance of the metal are improved, and therefore, the flange hub forgepiece higher in use performance and longer in life.

The invention relates to a lost foam casting process for a flywheel cover of a heavy truck engine. The lost foam casting process comprises the following steps of manufacturing a model of which the shape and the size are consistent with those of a casting from expanded plastics prepared by mixing expandable polystyrene and polymethyl methacrylate, coating the model with a refractory and air-permeable material, drying, hardening the model, placing the model in a sand box, filling dry sand, performing vibration ramming, pouring metal liquid, and performing vacuumizing to form negative pressure in the pouring process to realize the replacement of the foam model by the metal liquid and enable the foam model to disappear without traces. According to the process, various problems of a plurality of defects in the casting, surface roughness, high raw material consumption, severe environmental pollution and the like in a conventional sand mold casting process for the flywheel cover of the heavy truck engine are solved, and the lost foam has the advantages of high inner quality, surface brightness and cleanliness, high production efficiency, slight environmental pollution and the like.

The invention provides a precision forming method of an aluminum alloy reinforcement plate rectangular forging part, and belongs to the technical field of die forging. The precision forming method includes the steps that four bosses are machined on the four corners of the upper surface of an aluminum alloy blank, and a through hole is formed in the middle of the aluminum alloy blank to obtain a preformed blank; the preformed blank is placed into an impression of a lower die in a boss downward mode, an upper die and the lower die are used for forging, and the aluminum alloy reinforcement platerectangular forging part is obtained; the upper surfaces of the bosses are transitioned to the upper surface of the blank through an oblique plane, and the diameter of the through hole is 5-10 mm larger than that of a concave die and a constraint platform corresponding to the through hole. According to the precision forming method of the aluminum alloy reinforcement plate rectangular forging part,the through hole is formed in the middle of the blank, a reverse loading mode is used for forging, the die pressure during forming is reduced advantageously, meanwhile, the folding defect can furtherbe avoided, and the cutting working amount is decreased.

The invention relates to a dewaxing casting method for a drill bit and belongs to the technical field of casting. The casting method includes the steps of coating preparation, shell preparation, calcinations, melting casting and post-processing. The coating preparation includes the steps that materials are mixed, ultrasonic vibration is performed while mechanical stirring is performed for 8-15 hours, then plasma processing is performed for 3-5 minutes, and a basic coating is fabricated; and water is added to the basic coating to dilute the basic coating into a first-grade coating and a second-grade coating, and the viscosity of the first-grade coating is smaller than that of the second-grade coating. The shell preparation includes the steps that the coating is smeared on the preformed fusible wax mould surface, sand blasting and drying are performed, then dewaxing is performed, and a mould shell billet is fabricated. Smearing of the coating includes the steps of primary smearing and secondary smearing, in the primary smearing process, the first-grade coating is rotatably sprayed on the fusible wax mould surface, in the secondary smearing process, the fusible wax mould coated with the first-grade coating is soaked in the secondary coating and then taken out, and the steps of coating smearing, sand spraying and drying are repeatedly performed for 2-5 times. The drill bit prepared through the method is small in error, precise in size and smooth and clean in surface.

The invention relates to a brute-force hot-spinning accurate plastic forming method for hollow train shaft workblank and belongs to the technical field of plastic forming of long-shaft parts. According to the brute-force hot-spinning accurate plastic forming method, the problems that hollow train shaft moulds are difficult to manufacture and complex in manufacturing process are solved. The brute-force hot-spinning accurate plastic forming method comprises the steps of material preparing, heating, feeding, spinning and refining. By means of a brute-force hot-spinning technique, the rotating speed of work pieces, the feeding speed of a rotary wheel and the axial moving speed of a rotary wheel frame are controlled by a numerical controlling technique. Thus, high-accuracy hollow train shaft workblank can be obtained in a spinning manner, and quick accurate plastic forming of the hollow train shaft workblank can be achieved. The brute-force hot-spinning accurate plastic forming method is simple in manufacturing procedure, good in metal fiber flow direction, small in machining allowance, high in material utilizing rate, mouldless in forging, low in manufacturing cost and suitable for large batch production of various specifications of hollow train shafts.

The invention discloses a preparation method of a functionally gradient diamond / aluminum composite material packaging shell, and relates to a diamond / aluminum composite material and a near-net forming preparation method of the diamond / aluminum composite material. The preparation method of the functionally gradient diamond / aluminum composite material packaging shell comprises the specific steps that 1, diamond particles and aluminum powder are mechanically mixed according to a certain proportion and then pressed into a cold-pressed blank; 2, the cold-pressed blank is heated in a liquid-solid separation mold system to be in a liquid-solid mixed melting state; 3, the mold filling process is completed by liquid-solid mixed melting slurry under the action of pressure, and directional separation treatment is completed by part of the metal liquid phase through a liquid-solid separation channel so as to adjust the volume ratio of diamond on the top of a cavity; and 4, the remaining slurry is solidified layer by layer under the action of a bottom end cooling system, pressure maintaining is continuously conducted in the process, and finally a diamond / aluminum composite material gradient packaging shell is prepared. The chip bearing part at the bottom of a shell is high in diamond content, and has high thermal conductivity while the thermal expansion coefficient is matched with that of a chip; the diamond content at the top of a wall body is low, so that the welding compatibility with a cover plate material is ensured.

The invention discloses a laser cladding repairing method for airplane normal pin and bolt part surfaces. The method comprises the steps that spherical superhigh-strength steel metal powder is selected for faults such as mechanical and corrosive wear to the part surfaces, reasonable laser cladding technology parameters are adopted, appropriate heat treatment is adopted for removing residual stress and hydrogen atoms in the cladded parts, and therefore the performance of the airplane normal pin and bolt parts is recovered, and life extension repair is achieved. The deformation probability of the repaired normal pin and bolt parts is almost zero, and the depth of a heat affected zone is controlled within 0.5 mm; the repaired portion has no crack or melting or slag inclusion or other defects; and the using performance of normal pins and bolts is recovered. The airplane normal pin and bolt parts repaired through the method pass authentication before installation, and are installed and used successfully.

The invention relates to a method for casting a high-precision drill and belongs to the technical field of casting. The method comprises the steps of shell making, roasting, melting casting and after-treatment, wherein the shell making step comprises the following sub-steps: coating the surface of a preformed fusible wax pattern with a coating, performing sand blasting and drying, and after that, performing dewaxing to manufacture a shell blank; the coating sub-step comprises first-time coating and second-time coating; during the first-time coating, a primary coating is rotationally sprayed onto the surface of the fusible wax pattern; during the second-time coating, the fusible wax pattern coated with the primary coating is immersed into a secondary coating and then taken out; the viscosity of the primary coating is smaller than that of the secondary coating; and the coating, sand blasting and drying substeps are repeated for 2-5 times. The manufactured drill is small in error, precise in dimension and smooth in surface.

The invention relates to a magnesium alloy forged piece forming mould and method, in particular relates to an AZ80A magnesium alloy engine case isothermal forging forming mould and method, which aim at solving the problems of difficulty in forming, non-uniform structure property of magnesium alloy and low performance existing in conventional forging preparation of an AZ80A magnesium alloy forged piece. The forming mould comprises an upper mould, a lower mould, an ejection rod and multiple electric heating rings, wherein the upper end of a first cylinder is connected with a body, the lower end of the first cylinder is connected with the large-diameter end of a first circular truncated cone, coaxial first conical grooves are formed in the middles of the first circular truncated cone and the first cylinder, the diameters of the cross sections of the first conical grooves are gradually increased from top to bottom, four corners of the upper end surface of the lower mould are respectively provided with a positioning convex platform, the upper mould covers the lower mould, the four positioning convex platforms are arranged in corresponding positioning grooves, the upper mould and the lower mould are respectively provided with the electric heating rings, a second cylinder of the ejection rod is inserted into an ejection hole, and small circular truncated cones are arranged in the first conical grooves. The forming mould and method are used for preparing an AZ80A magnesium alloy engine case.

The invention relates to a die forging manufacturing method for a coal machine hydraulic support connector, and belongs to a forging method for processing a hydraulic support connector through die forging. The problems that in the method for manufacturing the coal machine hydraulic support connector, the processing difficulty is great, the labor intensity is high, the energy consumption is high, the yield is low and the production efficiency is low are mainly solved. The method comprises the four steps that 1, a die is manufactured, the biggest projection plane of the connector is taken as a parting surface, an upper die impression and a lower die impression are both a concave die, parting is conducted through a fold line, and an upper die block and a lower die block of a forging die are formed through one-time clamping in a die sleeve; 2, the die forging connector is manufactured, billet is taken as the raw material, pre-forging billet is obtained through the first fire, and finish forging is conducted for forming through the second fire; 3, excess materials are removed through machining; 4, heat treatment is conducted on the connector, pellet blasting treatment is conduced on the unprocessed surface of the processed connector, thermal refining is conducted, and the surface is coated with black finishing coat; packaging is conducted after the inspection is passed.

The invention discloses a machining method of a traveling thrust wheel of a large excavator, which is characterized by comprising the following steps: firstly, casting silico-manganese steel into a thrust wheel blank and then carrying out machine finishing on the blank to obtain the finished product of the thrust wheel. The silico-manganese steel is prepared from the following components in percentage by weight: 0.14-0.25% of carbon, 0.8-2.0% of silicon, 0.8-2.0% of manganese, 0.35-1.2% of chromium, no more than 0.025% of sulfur, no more than 0.025% of phosphorus and the balance of ferrum and unavoidable impurities. In the invention, by adopting a casting method instead of a forging method, the section shape of the cast blank is approximate to that of the finished product, the size of the casting is easily controlled, and the machining allowance is smaller and uniform; and as the materials with higher strength grade are used instead of the original thrust wheel material, the mechanical properties and the service performances are not lower than the level of the original forging material, and the machining process is unchanged and is more easily operated.

A forging method for manufacturing a large bevel arm three-way features that the finish allowance of a forged cubic block is increased. It includes such steps as choosing a forged cubic block to make its height is equal to the two times of the central line's height of main tube, machining a central hole of said cubic block to obtain the central hole of main tube, sawing to remove excessive material, ad machining oblique tube.

Provided is a rolling piston for a rotary type refrigeration compressor. The rolling piston is made of a steel tube which is formed by conducting cold-rolling on carburizing steel. Chemical components of the carburizing steel include 0.17%-0.23% of C, 0.17%-0.37% of Si, 0.80%-1.10% of Mn, 1.00%-1.30% of Cr, 0.04%-0.10% of Ti and the balance Fe. The rolling piston has the advantages that the supply of goods is ample, the price is low, the cost is reduced, and the environment is not polluted.

The invention discloses a welding method of a maritime crane barrel neck opening. The welding method comprises the following steps: welding a rolling passage plate, welding an annular plate assembly, welding an annular plate assembly and a rolling passage plate, welding a box body structure and a peripheral plate, welding a lower cone, and finally folding the box body structure and a cone. The welding method has the advantages that the maritime crane barrel neck opening is manufactured according to the welding method strictly through repeated verifications of a plurality of items, so that the allowance can be effectively reduced, the welding workload is reduced, the machining workload is reduced, the deformation of the barrel neck opening can be well controlled, the qualified rate of finished products is improved, and the welding method is beneficial to popularization.

The invention discloses a machining method of a traveling thrust wheel of a large excavator, which is characterized by comprising the following steps: firstly, casting silico-manganese steel into a thrust wheel blank and then carrying out machine finishing on the blank to obtain the finished product of the thrust wheel. The silico-manganese steel is prepared from the following components in percentage by weight: 0.14-0.25% of carbon, 0.8-2.0% of silicon, 0.8-2.0% of manganese, 0.35-1.2% of chromium, no more than 0.025% of sulfur, no more than 0.025% of phosphorus and the balance of ferrum andunavoidable impurities. In the invention, by adopting a casting method instead of a forging method, the section shape of the cast blank is approximate to that of the finished product, the size of thecasting is easily controlled, and the machining allowance is smaller and uniform; and as the materials with higher strength grade are used instead of the original thrust wheel material, the mechanical properties and the service performances are not lower than the level of the original forging material, and the machining process is unchanged and is more easily operated.

A rolling piston for a rotary refrigerating compressor and a manufacturing method thereof, wherein the rolling piston material is a precision steel pipe after cold rolling of GCr15 bearing steel, and the manufacturing method comprises the following steps: (1) selecting GCr15 bearing steel for cold rolling to conform to the rolling piston Steel pipes with required precision for inner diameter, outer diameter and thickness; (2) cutting steel pipes according to the length of the rolling piston material; (3) heat-treating the cut steel pipes with controllable gas; (4) coarsely grinding each surface of steel pipes; Chemically treated steel pipes; (6) Fine grinding all surfaces of steel pipes. The invention has the advantages that: the manufactured rolling piston has obvious advantages in wear resistance and high contact fatigue life. The cutting workload can be reduced by 50%, and the steel utilization rate can reach more than 90%, thus reducing the manufacturing cost. It also saves the casting method, avoids pollution to the environment and high energy consumption, and is a good method for energy saving and environmental protection.

The present invention relates to the field of wheel-side reducers, in particular to a wheel-side reducer. The wheel-side reducer includes a reducer housing, and a transmission assembly for transmitting power is arranged inside the reducer housing; the reducer The device casing includes an outer casing and an inner casing, and the outer casing is connected with the inner casing. The invention adopts a split design, which is beneficial to the forming of precision alloy casting molds, reduces the workload of mechanical processing, is suitable for mass production, and reduces costs; at the same time, it facilitates the installation of subsequent parts.

The invention discloses a planet carrier flange forge piece forging process which obtains a all-fiber stream line of planet carrier flange force piece metal, and therefore reduces forge piece machining allowance, improves the material utilization rate, reduces process cost of heat treatment after forging, enables inner tissue and outer tissue of a forge piece to be compact, enhances mechanical property, and reduces heat treatment process pressure. The planet carrier flange forge piece forging process is characterized in that the process includes the following steps of (1), calculating the sizes of forging materials and blanking; (2), upsetting and rounding the outer circles of the forging materials; (3), placing the forging materials in a leak plate which is similar to a planet carrier flange in shape, upsetting and planishing in a rotating mode; (4), punching blind holes in the forging materials through a lower punch; (5), upsetting and flattening the forging materials and punching holes through an upper punch; and (6), conning the forging materials obtained from the step (5) and forming the planet carrier flange.