38results about How to "Good tissue density" patented technology

The invention relates to a casting method of a main reducer housing. The casting method includes: a precoated sand core forming process, a smelting ball iron process and a casting process, the precoated sand core forming process includes core-making of precoated sand, coated sand type assembly and sand-type steel shot filling; the smelting ball iron process includes electric-furnace smelting and charging of molten iron and treatment; the casting method is characterized by including casting, unboxing, de-gating, one-step shot blasting, grinding, secondary shot blasting and detecting. With the method, exhaust smoothness is guaranteed, generation of hole defects in the casting is avoided from the sand core exhaust process, sand hole and pore defective reject rate is controlled within 1%, shrinkage or porosity defect is avoided, the casting is stable in size and high in surface smoothness, the yield is higher as compared with that with a traditional casting method of the main reducer housing, the production process is easier to control, and production competitiveness has higher advantages.

The invention belongs to the technical field of thermal-sprayed coating layers and relates to a composite functional coating layer capable of resisting abrasion and corrosion. The coating layer consists of the chemical components such as NiCrAlY alloy powder, metallurgical TiC powder and rare-earth oxide La2O3 powder, wherein the adding amount of the NiCrAlY alloy powder accounts for 49.5-80 percent of the weight of the powder of the whole coating layer; the adding amount of the metallurgical TiC powder accounts for 19.5-50 percent of the weight of the materials of the coating layer; the adding amount of the rare-earth oxide La2O3 powder accounts for 0.5-5 percent of the weight of the materials of the coating layer. Metallurgical combination is realized, so that the bonding strength of the coating layer is high, and organization is compact; therefore, compared with the common coating layer, the coating layer has the advantages that the abrasion resistance and the corrosion resistance are greatly improved. The coating layer disclosed by the invention is processed by a plasma composite spraying technology such as laser and atmosphere instead of an independent thermal spraying technology; in order to fulfill the aim of realizing coating layer metallurgical combination, due to the metallurgical combination, the coating layer combining strength can be improved, and the high compactness of the organization of the coating layer is realized; due to the high combining strength and the low porosity, the coating layer is long in service life and high in abrasion resistance and corrosion resistance.

The disclosed preparation method for self-lubricating alloy material comprises mainly: adjusting the sulfur content to improve product optimal lubrication effect, adding other alloy elements to reinforce ferrite. This product has strong wear-resist capacity to prolong its lifetime, and can also be prepared by powder metallurgy sintering with low cost.

The present invention discloses forming process of large conic roller blank, and belongs to the field of cold extrusion forming technology. The forming process includes the steps of: cutting the metal rod into the material sections in required size, external grinding to required size, extruding in an extruder at pressure of 200-800 tons, and pushing out the extruded large conic roller blank. The forming process is superior to turning process, and has high steel material utilization rate, high production efficiency, improved material structure and other advantages.

The invention relates to a highly turbocharged low pressure die casting machine, comprising a pouring layer (1), a thermal insulation layer (2), a case (3), a heating rod (4) and air inlet/exhaust holes (5), wherein the upper part of the hearth is provided with the heating rod (4), the lower part is provided with the pouring layer (1) and the thermal insulation layer (2). The highly turbocharged low pressure die casting machine is characterized in that the two sides of the upper part of the hearth are provided with the air inlet/exhaust holes (5). In the structure in the invention, the pouring layer is directly contacted and sealed with the case of a furnace in a filling way, thus high pressure gas can not enter into the thermal insulation layer and the pouring layer is protected. The air inlet/exhaust holes are arranged in heating tanks at the two sides, air is introduced/exhausted at the two sides simultaneously, the speed for introducing/exhausting the air can meet the requirement of mould filling during high pressure casting, structure compactness of a casting is good, and the strength and elongation percentage can meet product requirements.

The invention discloses a titanium microalloying high-silicon-content aluminum alloy and a preparing method thereof. The aluminum alloy comprises, by mass percent, 11.0%-14.0% of Si, 0.2%-0.7% of Mg, smaller than or equal to 0.15% of Fe, 0.015%-0.04% of Sr, 0.01%-0.03% of B, 0.05%-0.25% of Ti and the balance aluminum. The preparing method includes the steps that an aluminum-silicon intermediate alloy, a magnesium element, a silicon element and a titanium element are heated and melted, hexachloroethane is added for refining when melt is heated to 720 DEG C to 740 DEG C, Al-Sr and Al-B intermediate alloys are added for metamorphism treatment and grain refining treatment after standing is conducted, heat preservation is conducted for 30 min, vacuum standing is conducted for 30 min to 60 min, the mixture is heated to 710 DEG C to 730 DEG C and poured into a die, and a cast ingot is obtained; annealing is conducted for 3 h to 6 h under the temperature ranging from 520 DEG C to 540 DEG C; and hot extrusion or hot rolling deformation is conducted under the temperature ranging from 400 DEG C to 500 DEG C.

The invention relates to a preparation method of a high performance magnesium-based composite material component. In order to solve the problems that graphene as a reinforcing body is poor in wettability to a magnesium matrix and is easy to agglomerate to lead to a bad interface reaction easily, the preparation process is complex and is hard to control and the like, a high performance magnesium-based composite material component is prepared by the following steps of carrying out surface treatment on a magnesium alloy panel, spraying carboxylated graphene to the surface of the magnesium alloy panel after surface treatment, carrying out hot pressed sintering, crushing the magnesium alloy panel into magnesium alloy particles and carrying out semi-solid state indirect squeeze casting forming by taking carboxylated graphene as the reinforcing body of the magnesium-based composite material. The preparation method is advanced in process and detailed and accurate in data, and the prepared magnesium-based composite material component is free of shrinkage cavity and shrinkage porosity defect inside, good in tissue compactness, fine in grain, spherical and approximately spherical. The carboxylated graphene is uniformly dispersed in the matrix and good in interfacial adhesion. The tensile strength of the component reaches 335 Mpa, the ductility reaches 5.6% and the hardness reaches 102HV,and the preparation method is the advanced preparation method of the high performance magnesium-based composite material component.

The invention provides pressure casting equipment with an organ type radiating pressure casting die. The organ type radiating pressure casting die comprises a die support structure, a cooling assembly, a casting side edge core drawing mechanism formed by a sliding block compression block, a sliding block body and an inclined guide column and a gating system assembly; the die is arranged in a one-die one-cavity mode, cooling components of molding pieces achieve even cooling of a casting and a runner, even cooling of the casting in a die cavity is guaranteed, and the problems about casting looseness, cold isolation and the like are solved; an ejection mechanism component solves the problems about ejection and demolding difficulties in die cavities of the front and back dies of the casting, and automatic demolding of the casting is achieved; and a gating system is provided with an organ type air exhaust component, the problem about insufficient casting melted liquid flowing is solved, smooth flowing of casting melted liquid is achieved, the balance and the compactness of the casting texture are guaranteed, and the molding quality of the casting is guaranteed; and the die is simple instructure, reliable in mechanism motion and convenient to assemble and maintain.

The invention relates to a self-lubricating alloy material, which is characterized by comprising rare earth elements; the chemical compositions (weight percentage) are as follows: 5 to 15 percent of iron, 10 to 20 percent of chromium, 1 to 8 percent of molybdenum, 2 to 6 percent of niobium, 1 to 4 percent of cobalt, 0.03 to 0.1 percent of boron, 1 to 5 percent of tungsten, 1 to 5 percent of sulfur, 1 to 2 percent of silicon, 0.01 to 0.20 percent of cerium and the balance of nickel. The invention adds the rare earth elements and other alloy elements, strengthens ferrite, improves heat resistance of the material, has good structural compactness and self-lubricity, strong abrasion resistance and wide range of applicable temperature and leads the service life thereof to be prolonged greatly.

The invention discloses a deoxidizer which comprises the following components in percentage by weight: 46-48% of silicon, 14-16% of barium, 6-8% of calcium, 6-7.5% of rare earth metal, 6-7% of aluminum and balance of iron. The deoxidizer of the invention has good effect on sulphur removal, deoxidation and degasification and can be used for deoxidizing for stainless steel. The molten casting has good tissue compactness and can not leak water easily, and the mechanical strength and the corrosion resistance are greatly improved.

The invention discloses a negative pressure die-casting method for a heat-resistant steel exhaust manifold. The negative pressure die-casting method solves the problems that the yield of castings is low and the process yield is low in an existing gravity casting process method. The method comprises the following step of putting a sand mold into a casting box, then exhausting air in the casting box to form a negative pressure environment, and finally pressing molten steel into a casting mold, thereby obtaining a heat-resistant steel exhaust manifold casting. According to the negative-pressure die-casting method for the heat-resistant steel exhaust manifold, the casting yield and the process yield are effectively increased. The invention further discloses a negative pressure die-casting device of the heat-resistant steel exhaust manifold. According to the negative pressure die-casting device for the heat-resistant steel exhaust manifold, the casting yield and the process yield are improved, meanwhile, the production cost is effectively reduced, waste gas is easily treated in a centralized mode, and the purpose of environment-friendly production is achieved.

The invention discloses double-layer flashy fabric with 20D black nylon yarns. The double-layer flashy fabric comprises a fabric body. The fabric body is formed by weaving warps and wefts on the basisof a basic tabby double-layer texture structure, and infinitely-changed stripe channel gaps are adopted. The wefts include first wefts and second wefts. The fabric body comprises a first fabric layerand a second fabric layer. The first fabric layer comprises the warps and the first wefts, and the second fabric layer comprises the warps and the second wefts. The warps refer to 20D/24F nylon FDY-BL, the first wefts are 20D/24F black nylon yarns FDY-BL processing yarns, and the second wefts are 20D/24F nylon FDY-BL. The double-layer flashy fabric has the advantages that strength and tissue compactness are high; the fabric with down-proof texture is as thin as cicada's wings, and has high wrinkle resistance due to film ironing treatment, and accordingly, the hand feel is fine; the fabric isapplicable to top-grade shell fabric for spring, autumn and winter clothing, such as cotton-padded jackets and down jackets, and has a wide application range.

The invention discloses a magnetic conductive counter weight ring, a production method thereof and a magnetic control wheel. Materials of the magnetic conductive counter weight ring comprise, by weight, 30 to 80 meshes of iron powder, 3 to 8 % weight of the iron powder of manganese sulfide, 3 to 8 % weight of the iron powder sodium silicate and 6 to 12 % weight of the iron powder graphite powder. The production method of the magnetic conductive counter weight ring comprises the following steps of (1), mixing the materials to be uniform; (2) pressing the materials into an iron powder ring through an oil press and adjusting the pressure within a range from 3000 to 6000 MPa according to the sectional area of the iron ring; (3) arranging the iron powder rings into an electric furnace and enabling the temperature of the electric furnace to be from 400 to 800 degrees for 5 to 15 minutes firstly and then enabling the temperature to from 1000 to 1200 degrees for 5 to 15 minutes; (4) performing compression molding through a 300 to 600 ton oil press. The production method of the magnetic conductive counter weight ring has the advantages of utilizing waste materials, reducing energy consumption and accordingly reducing costs.

The invention relates to a cold forging-based manufacturing method for boss used for a vehicle engine fuel track and a manufacture device. The manufacture method includes a cutting step of cutting a round-shaped steel rod for forming a cylindrical first mold body; a first forging step of pressing the outer periphery of the cylindrical mold body for forming a second mold body having a front flat face and a rear flat face and an upper and lower convex curve parts; a softening heat treatment step of performing annealing heat treatment on the second mold body to soften the second mold body; a film covering step of performing film covering on the second mold body by utilizing a film covering treating agent; a second forging step of utilizing a forging mold composed of an upper punch head and a lower mold part for pressing and forging the second mold body into a third mold body having a round trough part provided by the fuel track body; an ending step of performing abrasive blasting on the third mold body and performing surface treatment. The method can eliminate all defects caused by casting and minimize cutting procedures. The mold body is good in tissue compactness, high in strength, good in dimension precision and good in quality.