36results about How to "Reduce casting stress" patented technology

The invention provides a pouring method of a hollow turbine guide vane. The pouring method comprises the following steps: (1) manufacturing a wax mold combination; (2) carrying out shell making on the wax mold combination to obtain a hollow turbine guide vane shell; (3) covering one layer of ceramic heat-preservation cotton on a shell vane body part; covering two layers of ceramic cotton on the whole shell; and putting the treated shell into a roasting furnace and carrying out casting, wherein in a casting process, the temperature of casting the shell is 1065-1085 DEG C and the pouring temperature is 1460-1480 DEG C. According to the pouring method of the hollow turbine guide vane, a pouring system of the hollow turbine guide vane is not changed and the shell temperature and the pouring temperature are adjusted so that the casting temperature field is changed; the two layers of ceramic cotton on the whole body and one layer of the ceramic heat-preservation cotton on the vane body part are matched so that after the temperature of the whole shell is improved, the temperature field is uniform, the casting stress is eliminated and the casting temperature is reduced; and furthermore, the temperature field on a casting vane body and an edge plate keeps uniform, the shell is effectively insulated and the casting stress is eliminated.

The invention discloses a casting method of a hundred-ton ductile cast iron template casting for a two-plate injection molding machine. The casting method comprises the steps of mold making, casting system making, sand mold making and molding by casting, thus obtaining the casting, wherein the reverse side of a mold installing surface is designed at the lower part of a casting position; an inner runner hole is formed on the reverse side of the mold installing surface; in the casting process, liquid iron enters lower horizontal runners via sprues, then enters type A filters via the lower horizontal runners and is subjected to inoculation and filtration purification treatment inside the type A filters; then the liquid iron which enters type B filters via upper horizontal runners and is subjected to purification and filtration again enters a casting mold cavity via the inner runner hole; the final strength of a sand mold is 1.3-1.4MPa, and the final strength of a sand core is 0.9-1.0MPa; the casting temperature is 1290-1310 DEG C, and the casting time is 85-100 seconds. The casting method has the advantages that the casting defects such as graphite degeneration, shrinkage cavity, shrinkage porosity, sand inclusion and the like are not easy to occur, thus improving mechanical properties.

The invention relates to a semi-continuous casting method for an in-situ particle reinforced aluminum-based composite and belongs to the technical field of composite forming. The method includes the following steps that an in-situ ceramic particle reinforced aluminum-based composite is taken, melted and subjected to heat preservation to obtain composite melt; the composite melt is injected into a crystallizer, and meanwhile ultrasonic treatment is carried out; when the melt is solidified at the position of a graphite annulus, a dummy bar head descends, and meanwhile cooling water is started to cool a cast rod; when the dummy bar head descends to the position of a scraper blade, the scraper blade starts to make contact with the surface of the cast rod, and the cooling water is scraped away from the surface of the cast rod; along with descending of the dummy bar head, the cast rod slowly enters a heating furnace to be annealed; and the cast rod is hoisted after casting is completed, and an aluminum-based composite semi-continuous cast rod is obtained. The method is simple in device, easy and convenient to operate and suitable for large-scale industrial production of the aluminum-based composite, and has good practical application value, and large-size in-situ particle reinforced aluminum-based composite cast ingots with fine crystal particles and evenly-distributed particles can be prepared.

The invention provides a method for manufacturing a large-size heat-treatment aluminum alloy slab ingot capable of being strengthened, and relates to a method for manufacturing the aluminum alloy slab ingot. The method for manufacturing the large-size heat-treatment aluminum alloy slab ingot capable of being strengthened mainly solves the problems that as for an aluminum alloy slab ingot prepared in the prior art, the casting yield is low, and wide and thick slabs with excellent properties cannot be rolled out. The method comprises the first step of material weighing, the second step of smelting, the third step of casting melt preparation and the forth step of molding, and the large-size heat-treatment aluminum alloy slab ingot capable of being strengthened is obtained. By means of the method, according to the prepared large-size heat-treatment aluminum alloy slab ingot capable of being strengthened, the yield strength ranges from 98 N/mm<2> to 120 N/mm<2>, the tensile strength ranges from 182 N/mm<2> to 201 N/mm<2>, and the elongation percentage in a casting state ranges from 9.56% to 14.7%. By means of the method, the large-size heat-treatment aluminum alloy slab ingot capable of being strengthened can be obtained.

The invention relates to a hollow billet and a manufacturing method thereof, and especially relates to a large-size and high-strength super hard hollow billet and a manufacturing method thereof. The purpose of the invention is to solve the problems of low yield, large production workload and difficult process control of casting of aluminum alloy hollow ingots prepared in the prior art. The large-size and high-strength super hard hollow billet comprises Si, Fe, Cu, Mn, Mg, Cr, Zn, Ti, B and Al. The manufacturing method comprises the following steps: 1, weighing; 2, smelting; 3, refining and casting of melt; and 4, molding. The method is mainly used for manufacturing the large-size and high-strength super hard hollow billet.

The invention discloses an aluminum alloy wheel hub gravity casting mould, which comprises a bottom die and a side die. A shunting cone is mounted in the middle of the bottom die, an upper die cooperating with the bottom die is mounted in the side die, and the upper die, the side die and the bottom die together form a cavity. The device is characterized in that: the side die is externally provided with several high-frequency vibration devices, the vibration heads of which are over against the side die. The mould provided by the invention can reduce or eliminate ventilation micropores in aluminum alloy wheel hubs, simultaneously strengthens the deslagging ability of liquid aluminum and improves the texture density and mechanical properties of casts, so that the produced aluminum alloy wheel hubs have improved quality. The aluminum alloy wheel hub gravity casting mould is mainly used as the casting mould for production of aluminum alloy wheel hubs.

The invention belongs to the technical field of magnesium-lithium alloys, and particularly relates to a high-ductility soluble magnesium-lithium alloy and a preparation method and application thereof. Aiming at the problems of low ductility, incomplete dissolution and the like of a packing tool in fracturing transformation construction of an oil and gas field, the high-ductility soluble magnesium-lithium alloy is obtained through alloy component design and by adopting the processes of vacuum casting, low-temperature severe plastic deformation, heat treatment and the like, and the alloy is prepared from the following components in percentage by mass: 9.0-12.0% of Li, 0-2.5% of Al, 0.1-1.0% of Zn, 0.1-1.0% of Ni, 0.2-1.0% of Cu, less than or equal to 1.0% of RE, and the balance of Mg. The tensile strength of the prepared magnesium-lithium alloy is not lower than 120 MPa, the yield strength is not lower than 90 MPa, the ductility is not lower than 45%, and the magnesium-lithium alloy can be used for machining and preparing high-plasticity soluble downhole tools used in the oil and gas field fracturing process, such as all-metal full-bore soluble bridge plugs, sealing rings or sealing rings.

The invention provides a three-body type composite casting wear-resistant lining plate which comprises a back layer, a transition layer and a surface layer which are arranged in sequence, the back layer is made of medium and low carbon steel, a filter layer is made of ferritic nodular cast iron, and the surface layer is made of high-chromium molybdenum wear-resistant white cast iron. According to the wear-resistant lining plate, the transition layer is additionally arranged between the surface layer high-chromium-molybdenum wear-resistant white cast iron and the back layer medium-low carbon steel, so that the wear-resistant lining plate not only has wear resistance, but also can endure a violent impact working condition, the adhesion between the layers is better, and the casting technological process is simplified; the invention further provides a manufacturing method of the three-body type composite casting wear-resistant lining plate, the ideal three-body type composite casting wear-resistant lining plate can be obtained, the shrinking percentage is in smooth transition, combination is tight and natural, casting stress is greatly reduced, and casting defects are remarkably reduced; and then the three-body type composite casting wear-resistant lining plate blank is subjected to quenching and tempering treatment, so that the three-body type composite casting wear-resistant lining plate has better mechanical properties.

The invention discloses a machine base of a lightweight and high-rigidity gantry machining center. The rib is an inverted W shape, the triangular-shaped tips on both sides of the upper end of the reinforcing rib pass through the top base plate, and the top of the triangular-shaped tip of the reinforcing rib is provided with a top slide rail, and the three ends of the lower end of the reinforcing rib It is connected and fixed with the base plate on the lower side. In the present invention, the double guide rails of the base are supported by inverted W-shaped reinforcing ribs, so that the weight of the moving part workbench and the workpiece processed on the guide rails is dispersed through the reinforcing ribs, and the supporting area and range are reduced from small to small. To the maximum, the inside of the base is like multiple triangular supports, which minimizes the casting stress of the casting. At the same time, through annealing and other artificial aging methods, the residual stress of the casting is eliminated, and the stability of the machine tool is greatly improved; at the same time, the material cost is saved. At the same time increase the rigidity.

The invention provides a method for improving the metallurgical quality of a large-specification 2000 series aluminum alloy ingot, and is suitable for a large-specification flat ingot with the size of 520mm (thickness) x 1620mm (width) and a large-specification round ingot with a diameter of 1000mm. The method comprises the following steps of: jointly applying ultrasonic waves and electromagnetic waves to molten aluminum (such as molten aluminum in a front groove) during casting; and selecting ultrasonic frequency, coupling parameters of electromagnetic waves, casting temperature, casting speed and water flow according to alloy components. According to the method, the casting stress of the large-specification cast ingot can be effectively reduced, cracks are reduced, the composition segregation degree of the cast ingot is reduced, microporosity is reduced, the cast ingot is prevented from cracking, and the casting forming rate is increased.

The invention belongs to the technical field of cast iron casting, and discloses a method for forming a main lubricating oil passage of a nodular cast iron diesel engine body and application. A bottom-pouring open-type gating system with a filter device is adopted to purify molten iron, a feeding head is arranged at the thermal center part of the main lubricating oil passage, and cold iron is usedin cooperation to balance the temperature field of nodular cast iron; and the stokehold chemical composition, reasonable charging, multi-stage inoculation, duration control, good nodularization, thorough slagging-off and fast pouring parameters are determined according to the principles of high carbon equivalent and high carbon and low silicon, and internal compaction of the thick and large thermal center part is performed to eliminate shrinkage and slag inclusion inside the main lubricating oil passage of the engine body. The method is beneficial to realizing the basic balance of the temperature field of the nodular cast iron. The method guarantees the high quality of the molten iron, realizes the internal compaction of the thick and large thermal center part, eliminates the quality risks of shrinkage and slag inclusion defects inside the main lubricating oil passage of the engine body, and overcomes the shrinkage casting defect of the main lubricating oil passage of the complicatednodular cast iron diesel engine body.

The invention relates to the technical field of high-temperature alloy investment precision casting, in particular to a method for forming an inner cavity of a high-temperature alloy hollow guide vane. When the mold core mold is designed, the whole inner cavity mold core is divided into an exhaust edge and an air inlet edge, an inner cavity mold block on one side of the exhaust edge is made into a ceramic mold core mold, and a mold block on one side of the air inlet edge is made into a water-soluble mold core mold. When the inner cavity mold core is prepared, the ceramic mold core and the water-soluble mold core are pressed respectively, and after the two pressed mold cores are combined into a complete mold core, a blade wax mold is pressed; according to the principle that a water-soluble mold core is dissolved in water, the water-soluble mold core is removed, the remaining ceramic mold core is pressed into a wax mold, the side close to an air inlet edge serves as a fixed end, an exhaust edge serves as a free end, shell preparation is conducted, and the high-temperature alloy guide blade is prepared through the method that the ceramic mold core is fixed through an inner cavity shell. The casting stress generated by the shrinkage difference of the ceramic core and the molten metal can be reduced, and the crack and recrystallization tendency of the blade can be reduced.

The invention belongs to the technical field of the suspension system of the commercial vehicle, and particularly relates to an auxiliary spring bracket comprising a bracket installation part and a plate spring contact part. The plate spring contact part extends by being perpendicular to the side end face of the bracket installation part; the side end face of the bracket installation part is in the shape of a trapezoid; the bracket installation part and a frame are detachably connected; the plate spring contact part comprises an auxiliary plate spring connection part and a fender steel bar connection part, the cross section of the auxiliary plate spring connection part in the shape of an arc; the fender steel bar connection part is connected with the sunken side of the auxiliary plate spring connection part; the side wall, away from the auxiliary plate spring connection part, of the fender steel bar connection part is provided with a groove; the side walls of the groove are respectively provided with a first fin and a second fin; the first fin and the second fin are provided with through holes correspondingly; and the fender steel bar connection part is connected with a steel bar, so that the auxiliary plate spring connection part is connected with an auxiliary plate spring when the fender steel bar connection part is connected with the steel bar. According to the invention, the functions of the auxiliary spring bracket and a fender support are integrated as a whole, the structure is simple, and the weight is low.