65results about How to "Reduce shrinkage defects" patented technology

The invention provides cold work die steel. The cold work die steel comprises C, Si, Mn, Cr, Mo, W, V, P, S, Cu, Mg, Ti, Sr, Zr, B, Zn, Re, Sn, Pb, Be, Sc, Li, Ni, La, Al and the balance iron, wherein the sum of the mass percentages of the components is 100%. The nodular cast iron comprises multiple kinds of nonmetal, metal and transition metal elements. Because the elements are added and cooperate with one another, the oxidation resistance, the corrosion resistance, the abrasion resistance, the compression resistance and the shock resistance of a compressor cylinder block of an air conditioner are improved, and the service life of the compressor cylinder block of the air conditioner under severe working conditions is prolonged.

The present invention discloses a production process for weaving all-cotton cutting motif fabric by an air-jet loom. The production process comprises the following steps of winding process, warping process, sizing process, drawing-in process, weft preparation, and weaving process. The cutting motif fabric is usually weaved by a rapier loom and is not suitably weaved by a high-speed air-jet loom. According to production process, the cutting motif fabric is weaved by the air-jet loom, product quality and production efficiency are ensured, and enterprises gain considerable benefits. Ground warp threads are drawn in front zones of heald frames, and droppers are drawn in back zones, thereby facilitating reduction of tension force of the ground warp threads. Colored warp threads are drawn in the back zones of the heald frames, droppers are drawn in the front zones, and tension force of the colored warp threads is relatively small, thereby facilitating increase of the tension force of the colored warp threads and reduction of knees defects. When the former processes are performed for production, the winding and warping processes are performed at a low speed, air splicing is configured to the winding process so as to reduce yarn hairiness, coating is important in the sizing process, the weaving process is assisted by early opening, large tension force and late weft insertion and the like, and the problem of weft stop is solved.

The invention provides a nodular cast iron used for an air conditioner compressor cylinder. The nodular cast iron comprises, by weight percent, C, Si, Mn, P, S, Cu, Mg, Ti, Sr, Zr, Cr, B, V, Zn, Re, Sn, Pb, Be, Sc, Li, Ni, La and the balance iron, wherein the sum of the weight percent of all components is 100%; and the nodular cast iron comprises multiple nonmetal elements, metal elements and transition metal elements, the elements are added and matched, oxidization resistance, corrosion resistance, abrasion resistance and compressing and vibration resistance of the air conditioner compressor cylinder are improved, and accordingly, the service life of the air conditioner compressor cylinder under the poor working condition is prolonged.

The invention discloses a method for computing an accurate value of a carbon equivalent of cast iron and the application of the method and belongs to the technical field of cast iron alloy. According to the invention, influence of carbon, silicon and microelements on the carbon equivalent is taken into simultaneous consideration, the actual carbon equivalent of iron liquid is quickly and accurately calculated by using a mathematical modeling method, errors of theory and practice are obviously reduced, and furnace charge proportion or silicon iron addition can be timely adjusted in the production process, so the carbon equivalent approaches an eutectic point, and the casting performance and casting quality of the cast iron are improved.

The invention provides an automobile flywheel pouring system and a pouring method thereof which can reduce the reject rate of castings and have a smooth surface. The automobile flywheel pouring system of the present invention comprises a sprue cup, a sprue, a runner, a riser with a riser neck, and an ingate; it also includes a riser neck chill, and the riser neck chill is located at below the riser neck. In the pouring system and pouring method for the automobile flywheel of the present invention, the riser neck cold iron is placed at the riser neck, which can not only make full use of the limited amount of liquid iron feeding of the riser, but also make the riser neck solidify in time, and give full play to the ductile ink. The expansion and self-feeding effect of cast iron graphitization greatly reduces the internal shrinkage cavity and shrinkage porosity defects of the flywheel casting, reduces the reject rate of the flywheel from 15% to less than 5%, and greatly improves the process yield.

The invention provides a preparation mold for a piston for a high-power engine and a piston preparation method. In the prior art, the problems that the casting defects such as shrinkage porosity of the center of the top of a blank are more, more air hole defects exist on the top of a piston, and the performance difference between the skirt part of the piston and the top of the piston is relativelylarge exist. The provided preparation mold comprises a top mold, a side mold and a core mold, a pressure air channel and a dead head structure are arranged in the top mold, and a cooling water channel is formed in each of the side mold and the core mold; and the preparation mold is characterized in that a pressure adjusting device is connected to the pressure air channel in the mold, the coolingwater channel on the side mold is in a wave shape, and an emitting head of an ultrasonic generator is arranged on the core mold. The problems of shrinkage porosity, the air holes and the poor overallperformance consistency in the prior art are well solved.

The invention relates to a method for casting castings, in particular to a method for casting annular thin-wall castings by means of a feeding stack box of a gating system. The method is characterized in that firstly, a mould is designed and manufactured; secondly, a core box containing a detachable cross pouring gate, a detachable feeding pouring gate and a casting mould is manufactured; thirdly, a corresponding lower-form and shrinkproof loam core is manufactured, and the loam core and the feeding pouring gate are manufactured according to the number of the castings; fourthly, the mould is matched, and castings are obtained by pouring molten iron after the mould is matched; and fifthly, the qualified castings are obtained after grinding, cleaning and detecting are completed. According to the pouring method of the annular thin-wall castings, the mould is easy to manufacture, a plurality of parts can be manufactured through one box according to needs, the number of the castings through the box can be flexibly adjusted according to needs, the finally formed castings are good in structure and performance, the probability of the shrinking defect is obviously lowered, the cost is low, and the percent of pass of the products is high.

The invention discloses a production technology of a multi-alloy cylinder cover. The production technology comprises the following steps that preparation is conducted, specifically, a stream inoculantincluding 60-65% of Si, 1.0-1.5% of Zr, 0.5-1.5% of Re, 0-0.5% of Al, 2.0-3.0% of Ba and the balance Fe and inevitable impurities is prepared; smelting is conducted, a molten iron raw material is putinto an electric furnace, and machine starting is conducted for melting; a ladle transfer inoculant is added 5-8 min before molten iron is discharged from a trough, and primary inoculation is conducted; and pouring and steam inoculation are conducted, specifically, when the temperature of molten iron is lowered to 1400-1440 DEG C, pouring is conducted for 6 min, secondary inoculation is conductedwhen the stream inoculant is added into the molten iron fluid in the pouring process, cooling is carried out stage by stage, the white cast and shrinkage defects can be decreased through an instant inoculant, the form and distribution situation of graphite in a cylinder cover casting piece are perfected, the strength and hardness of the cylinder cover casting piece are improved, the service lifeis prolonged, and the elongation percentage is reduced.

The invention relates to a casting method of aluminum alloy castings. The casting method of aluminum alloy castings comprises the following steps of firstly, making a cope flask and a drag flask according to the shape of one casting, and carrying out coating treatment on the cope flask and the drag flask; secondly, carrying out mold assembly on the cope flask and the drag flask to form a cavity, and carrying out fastening treatment; thirdly, carrying out vacuum pumping treatment on the cavity; fourthly, filling the cavity with aluminum alloy molten metal with the injection speed ranging from 2m/s to 6m/s; fifthly, increasing the pressure of the cavity to 5 Mpa to 10 Mpa, and carrying out pressure maintaining treatment; sixthly, relieving the pressure of the cavity to the normal pressure after the casting formed in the cavity completely solidifies, separating the cope flask from the drag flask, and taking out the casting, namely, the aluminum alloy casting. The aluminum alloy castings prepared with the preparation method is good in surface quality and low in preparation cost.

The invention is mainly applied to the technical field of casting of the diesel engine bearing cover, in particular to a casting process for a bolt hole of a large-scale ductile iron main bearing cover. The casting process is characterized by comprising the steps that 1, a corundum mullite ceramic tube is selected; 2, a ceramic tube fixing core head is arranged, and resin sand is used for molding;3, the casting sand mold is coated with coatings and then is dried; 4, resin sand is filled in the middle of the dried ceramic tube; 5, the outer wall of the filled ceramic tube is coated with an alcohol-based fire-resistant coating and then is aired after being ignited; 6, the coated casting sand mold and the aired ceramic tube are dried again, and the dried ceramic tube is placed in the ceramictube fixing core head; and 7, mold assembling, pouring and cleaning are carried out. According to the casting process, the defects of using a sand core and a cast steel tube process such as penetration, deformation, blowholes, hard spots and the like are overcome; meanwhile, the operation of workers is simple, multiple pieces can be manufactured at the same time, the production efficiency is greatly improved, and the production cost of manufacturing a core box is also saved; and the ceramic tube has the advantages that the strength can be high, sand sticking and penetration can be prevented,and the defects of porosity and shrinkage can be overcome.

The invention discloses a special nickel-base metal ceramic alloy powder for connecting rod laser cladding, which comprises the following components in percentage by weight: 10-12% of titanium carbide, 0.8-1.4% of carbon, 2-4% of calcium fluoride, 2-4% of silicon nitride, 9-12% of germanium, 18-24% of chromium, 2-4% of silicon, 5-7% of iron, 5-8% of molybdenum, 0.1-0.4% of manganese and the balance of nickel. The nickel-base metal ceramic alloy powder is specially used for connecting rod laser cladding, and can form a cladding layer on the connecting rod surface by a laser cladding technique. The nickel-base metal ceramic alloy powder can reduce bubbles, cracks and shrinkage void defects on the cladding layer, and enhances the fatigue resistance, toughness and hardness of the connecting rod.

The invention discloses a special cobalt-base metal ceramic alloy powder for guillotine laser cladding, which comprises the following components in percentage by weight: 11-13% of titanium carbide, 0.1-0.4% of carbon, 4-6% of calcium fluoride, 1-3% of silicon nitride, 6-9% of iron, 5-7% of chromium, 2-4% of zirconium, 1-3% of vanadium, 2-4% of silicon, 0.8-1.2% of manganese and the balance of Co. The cobalt-base metal ceramic alloy powder is specially used for guillotine laser cladding, reduces bubbles, cracks and shrinkage void defects on the cladding layer, and enhances the hardness, strength and shock resistance of the guillotine.

The invention discloses a sand mold casting method, and belongs to the technical field of metal material casting. The sand mold casting method comprises the following steps that S1, a mold is manufactured and made of non-magnetic materials; S2, in parts by weight, 100 parts of metal sand and 2-4 parts of a water glass binder are evenly mixed to prepare molding sand; S3, the mold is placed in a sand box, then the molding sand is filled until the sand box is full, and thus a casting mold is formed; S4, a sprue and a riser are formed, and the box is closed; S5, the sand box is heated; and S6, metal liquid is injected into the casting mold, and after the metal liquid is solidified to form a casting, shakeout and shot blasting treatment are conducted. According to the sand mold casting method,the metal sand casting mold and inclined pouring are adopted, a mold cavity is high in stability, mold filling is stable, generation of slag inclusion can be reduced, casting mold exhaust is facilitated, the defect of air holes is overcome, and mechanical properties of the casting are high.

The invention discloses a casting device and method for a precoated sand stacking type product. The casting device comprises a casting frame; the casting frame comprises a sprue cup, a straight pouring gate and a plurality of parallel casting layers; the sprue cup is arranged on the top of the casting frame; the straight pouring gate communicates with the sprue cup; at least a flow dividing transverse pouring gate located on the bottommost layer is included, and the flow dividing transverse pouring gate forms a flow guiding segment; during casting, the flow guiding segment is used for guidingcasting liquid at the bottommost layer to flow to an upper casting layer; the two sides of the flow guiding segment are correspondingly connected with the straight pouring gate and the transverse pouring gate; the transverse pouring gate forms the plurality of casting layers; each casting layer is provided with a plurality of inner sprues, and each inner sprue is connected with a to-be-cast casting; and the height of the casting frame is 800-1000 mm. The casting device makes casting start from the bottommost layer, the casting efficiency is improved, meanwhile, due to the casting manner, the flowing direction of molten iron is controllable, and cold insulating defects are reduced.

The invention belongs to the field of casting and particularly relates to a coated sand shell mould and steel-coated sand solidification casting process. The casting process includes molding material preparation, molding, core making, metal smelting, pouring, solidification control and other technologies. The invention aims to make innovation on the aspects of molding and solidification control so that a casting can be superior to a casting tissue produced regularly. The casting process is characterized in that two types of materials are adopted for a molding process for compound molding, the two types of materials comprise surface sand and floor sand, and the surface sand and the floor sand are of different heat conductivity coefficients. Coated sand is selected as the surface sand, the consumption of the coated sand is reduced, and casting surface quality is improved; steel sand is adopted for the floor sand, the used sand regeneration cost is lowered, more importantly, the steel sand is served as conformal indirect cold iron, the casting modulus is lowered, and casting defects are reduced; and the two molding materials of different heat conductivity coefficients are matched, and the cooling speed is controlled to obtain the uniform casting tissue. The process is high in production flexibility, good in applicability and low in cost.

The invention relates to a production method of a new energy automobile motor aluminum shell. In the method, the following hardware devices are included: an outer shell die device, an inner shell diedevice and an end cover die device, wherein the outer shell die device and the inner shell die device are composed of a punch fixing plate, a punch, an upper die plate, a locking block, sliding blocks, a die core, core-pulling oil cylinders, a die frame, a die foots, a lower die plate, upright cylinders and the like; and the end cover die device is composed of a second upper die plate, an upper die frame, an upper die core, a lower die core, a lower die frame, a second die foot, a second lower die plate, a second sliding block, a second locking block, a second core-pulling oil cylinder, a locking block oil cylinder and the like. A motor aluminum outer shell, a motor aluminum inner shell and a motor aluminum end cover are obtained through a production process flow of raw material preparation, feeding, forging and pressure maintaining, and product forming. According to the production method, the production efficiency of the motor aluminum shell can be obviously improved, the yield reaches 95% or more, the energy consumption of casting is greatly reduced, the defects of pores and shrinkage few occur in the motor aluminum shell, the structure is compact, no crack is generated, the mechanical performance is good, and the stability is good.

The invention provides a local extrusion method used for high-pressure casting. The method comprises the steps that a local extrusion device used for high-pressure casting is used for extruding the surface of a casting. The device is composed of an extrusion core sleeve (03), an extrusion rod (04), an extrusion oil cylinder (05) and an extrusion oil cylinder piston (06) and is characterized in that the extrusion oil cylinder (05) internally comprises the extrusion oil cylinder piston (06), the extrusion oil cylinder piston (06) is connected with the extrusion rod (04), the extrusion rod (04) is located in the extrusion core sleeve (03), and the extrusion core sleeve (03) and the extrusion oil cylinder (05) are fixed; the extrusion oil cylinder piston (06) is driven to drive the extrusion rod (04) to complete extrusion. The method has the beneficial effects that the extrusion stroke of the local extrusion process can be effectively ensured, meanwhile, the shrinkage defect of the large and thick portion of products is reduced, the production rejection rate is reduced, and the enterprise economic benefits are obviously improved.

The invention discloses a high-wear-resistant oriented Fe2B compact block and a preparation method thereof. The method comprises the following steps that pure iron blocks and ferro-boron particles aretaken as raw materials, materials are prepared according to the mass ratio of Fe to B being 91.2: 8.8, the prepared mixed raw materials are put into a crucible, the crucible is put in a vacuum induction melting furnace for vacuum induction melting, after smelting is completed, metal melt is poured into a water glass sand mold cavity, and furnace cooling is conducted to a room temperature to obtain the oriented Fe2B block. The high-wear-resistant oriented Fe2B block prepared by the method has good purity and compactness, Fe2B crystal grains presents oriented arranged uniform columnar crystal form characteristics in a solidification direction, so that the high-hardness advantage of a cross section can be fully exerted, and the excellent wear-resistant performance is presented.

The invention discloses a method for overcoming a casting bolt shrinkage porosity defect and relates to the technical field of casting. The method specially comprises the steps that when a casting sand core is prepared, a hole-forming boss is arranged at the corresponding position of the center of a casting bolt and is in a shape of a circular truncated cone, the hole-forming boss is removed aftera casting is formed through pouring, and a circular truncated cone shaped blind hole is formed in the center of the casting bolt and is machined into a threaded hole. According to the method, the hole-forming boss is arranged at the corresponding position of the center of the casting bolt, a feeding dead head added at the top of the bolt and a quenching chiller added at the bottom are not needed,and the process is simple, low in cost and can overcome the casting bolt shrinkage porosity defect.