162results about How to "Guarantee casting quality" patented technology

A novel casting method for a steam turbine valve shell casting comprises the following steps that solid model split parts of the steam turbine valve shell casting are manufactured, the maximum section of the steam turbine valve shell casting is selected as a parting surface, the corresponding upper valve shell casting solid model split part and the corresponding lower valve shell casting solid model split part are manufactured, and a middle pipe opening is located in the upper valve shell casting solid model split part; modeling is carried out, lower box modeling is carried out, a sand box and the lower valve shell casting solid model split part are arranged on a modeling platform, quick sand modeling is carried out, a pouring system is laid, and box overturning is carried out after placement is conducted for preset time; upper box modeling is carried out, the other sand box and the upper valve shell casting solid model split part are arranged on a lower box, quick sand modeling is carried out, and open risers are arranged on the side walls, close to the middle pipe opening, of the upper valve shell casting solid model split part and the end pipe opening, far away from the flange face, of the upper valve shell casting solid model split part; a sand core of an inner cavity of the steam turbine valve shell casting is manufactured; and after core setting, box combining, pouring, cooling and box beating, the steam turbine valve shell casting is finally obtained.

The invention provides an investment casting method which is completed by three working procedures of die making, shell making and formwork roasting and casting, wherein, the procedures of shell making include the following steps: firstly, doping; secondly, spreading the sand; thirdly, hardening; fourthly, air drying; and fifthly, de-waxing; the first four steps are carried out for 3 times in a cycling way and reach the making of a three-layer formwork; the last layer is only coated with materials, without sand-spreading, thus manufacturing a 3.5-layer formwork; then a tunnel kiln resistance furnace is adopted to roast the formwork so as to improve the production efficiency; the formwork is used after being cooled and a sand box is used for burying the cooled formwork into the sand box; the cooled formwork is filled with sand, compacted and then cast; sand used for compaction is recycled after being treated by a sand processing system. The formwork layer is manufactured to be thin by using the technical proposal and uses fewer materials, which can shorten working hours of procedures and reduce the production cost, and simultaneously, ensure the quality of casting pieces and save resources.

The present invention discloses method of casting end cap for mill. The present invention can ensure high casting quality by means of connecting external chill in thickness of 0.6-0.8 time the hot pitch circle diameter, applying the external chill with sand layer of 10-15 mm thickness, inwards shifting the hot pitch circle in the round corner region to avoid microscopic shrinkage to affect magnetic particle inspection, and ensuring the shrink passage with proper divergence angle for solidification in the order from far parts to the sink head.

The invention discloses a system for casting and pouring a propeller of a ship, comprising a sealing pressure tank (11), a steel ladle (10) which is arranged inside the sealing pressure tank (11) and used for containing high temperature molten steel (8), a liquid lifting tube (7) extending inside the steel ladle (10), a gas injection mechanism communicated with the sealing pressure tank (11), as well as a sand mold (2) and a mud core (3) that are arranged on the top of the sealing pressure tank (11); the sand mold (2) and the mud core (3) form a die cavity (14) and a shrink head (1), and the top of the liquid lifting tube (7) is communicated with the die cavity (14). By adopting the structure, the system for casting and pouring the propeller of the ship has stable liquid metal stamping, good formability and compact structure of cast parts as well as high mechanical property, so that the quality of the cast parts of the propeller of the ship can be ensured; the consumption of the metal liquid is reduced, and the yield of the metal liquid is increased, so that the system is applicable to the casting mold of various materials in batches.

The invention discloses a casting process for a crankshaft. The casting process comprises a molding process and a smelting and casting process. The molding process comprises the following steps of: adopting resin sand for molding, wherein the resin sand comprises 1% of resin, 0.4% of a curing agent and the balance of molding sand; performing transverse molding during the molding, and after mould arrangement and mould assembly, lifting the whole mould vertically to form a resin sand mould. The smelting and casting process comprises the following steps of: preparing casting liquid by using C, Si, Mn, P, S, Mg, Re, Cu, Sn and Fe as raw materials according to a certain percentage; fully melting the raw materials to form molten iron; placing a spheroidizing agent and an inoculant into a ladle, pouring molten iron into the ladle for spheroidizing and inoculating to form the casting liquid; and pouring the casting liquid into the resin sand mold to form a crankshaft casting after solidification. Through the casting process provided by the invention, the defective rate of crankshaft products is low, the qualification ratio reaches 99% or above, and all properties can reach the standards.

The invention relates to a sectional-type multi-stage centrifugal pump, in particular to a single-section structure of a sectional-type multi-stage pump for sewage. The single-section structure of the sectional-type multi-stage pump for the sewage is composed of impellers, impeller back vanes, impeller inlet seal rings, spatial guide vanes, guide vane flow guide pads, bearings, shaft sleeves, middle sections, spindles and flat keys. The single-section structure is characterized in that the spindles, the impellers, the shaft sleeves and the flat keys form the rotor part of the single-section structure of the sectional-type multi-stage centrifugal pump for the sewage; the middle sections, the spatial guide vanes, the guide vane flow guide pads, the impeller inlet seal rings and the bearings form the stator part of the single-section structure of the sectional-type multi-stage centrifugal pump for the sewage. The single-section structure has the axial force balancing function of the pump and the independent supporting function; moreover, the spatial guide vanes are adopted, the radial size of the single-section structure is smaller than that of a structure with radial-type guide vanes adopted by more than 5%, liquid flowing out from the impellers is collected separately through single flow channels and is independently conveyed to next-stage impeller inlets respectively and the fluid hydraulic loss is less than that of an existing structure by about three percent.

The invention provides an aluminium alloy casting mechanical performance prediction method, comprising: first casting a sample, establishing a relationship among a mechanical performance, porosity and secondary dendrite arm spacing; then constructing a mathematical model of microscopic porosity and secondary dendrite formed in a casting solidification process; and finally predicting values of the microscopic porosity and the secondary dendrite by a computer before casting, and predicting a mechanical performance of an aluminum alloy casting according to the relationship among a mechanical performance, porosity and secondary dendrite arm spacing. When the predicted mechanical performance is not up to standard, an improved casting technique enables the mechanical performance to meet design requirements, so as to achieve a purpose of nondestructive testing. The invention has the advantages that the casting technique is optimized, casting quality is ensured, once casting is achieved, and an important application value is achieved.

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 bottom gating system with an ingate in circular cross section, which belongs to the technical field of casting, the existing gating system is not applicable to gating large casts, high in rejection rate and easy to lead the casts to produce stress and porosity so as to cause the high rejection rate of the casts. The bottom gating system comprises a mold cavity and a main sprue, a runner, a sub-sprue and a sub-runner in sequential connection, and is characterized in that the sub-runner is connected to the bottom part of the mold cavity via the ingate in the circular cross section. The bottom gating system can reduce the volume of a sand box, reduce the consumption of molding sand and further greatly reduce the production cost by adopting the ingate in the circular cross section; the bottom gating system can further lead molten metal to flow into the mold cavity smoothly, effectively prevent oxidizing slag which is produced by turbulent flow of the molten metal from being entangled into the mold cavity, prevent the production of slag inclusion in the cast, and further improve the quality of the cast; as molten iron enters into the mold cavity through the ingate in the circular cross section, the bottom gating system is difficult to produce temperature difference, and can reduce the production of the porosity and ensure the quality of the cast; and the operation is convenient.

The invention relates to a temperature control method for a magnesium alloy pressure casing die. A plurality of temperature control areas are divided according to a corresponding position of a critical area during casting forming in the die and temperature of every temperature control area is controlled through a die temperature controller to provide temperature constant oil to heat when encounters cold and to cool when encounters heat. According to the temperature control method for the magnesium alloy pressure casing die, the plurality of temperature control areas are divided in the critical area of the die; the temperature of the temperature control areas are controlled through the temperature constant oil provided through the die temperature controller; when a casting deforms, cooling shrinkage of the casting is controlled through adjustment of the temperature differences of the temperature control areas, deformation of the casting is reduced, and the casting quality of the casting is guaranteed; meanwhile compared with the traditional technology which cools through water and heats through oil, a flexible control purpose is achieved due to the fact that the temperature constant oil heats the die when encounters cold and cools the die when encounters heat. The temperature control method for the magnesium alloy pressure casing die is applied to casting of magnesium alloy vehicle door pressure castings.

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 discloses a turbine casing casting method which is used for casting a turbine casing. The turbine casing casting method comprises the following steps: S1, arranging a riser: choosing the riser and putting the riser at the external edge of the turbine casing; S2, arranging a chilling block: putting the chilling block in the turbine casing and enabling the chilling block to be attached to a thick large portion of a casting; S3, arranging a thermal-insulation block: arranging the follow-up thermal-insulation block on the outer side in a feeding channel of the casting and enabling the follow-up thermal-insulation block to be attached to the feeding channel of the casting; S4, designing and pouring a runner: arranging the corresponding runner in a casting mold and then finishing pouring the turbine casing through the runner; S5, polishing and manufacturing the casting: taking the poured turbine casing from the mold and cutting and polishing the riser position of the turbine casing. All in all, the turbine casing casting method is low in cost, convenient to operate, excellent in using effect and high in using and application value.

The invention discloses a stepped type pouring device. The stepped type pouring device comprises an upper-layer casting molding cavity, a lower-layer casting molding cavity, upper sprues and lower sprues. The upper-layer casting molding cavity communicates with the lower-layer casting molding cavity. Risers are formed in the upper end of the upper-layer casting molding cavity. The risers communicate with upper-layer pouring gates. The upper-layer pouring gates communicate with the upper sprues. The lower-layer casting molding cavity communicates with bottom-layer pouring gates. The lower endsof the lower sprues communicate with the bottom-layer pouring gates. The upper sprues are connected with the lower sprues through cut-off devices. Each cut-off device comprises a T-shaped cast pipe. Each T-shaped cast pipe is composed of a transverse pipe and a vertical pipe. Each transverse pipe communicates with a corresponding vertical pipe. The two ends of each vertical pipe are connected witha corresponding upper sprue and a corresponding lower sprue respectively. A spring is arranged in each transverse pipe. Each spring is fixedly connected with a blocking block. A soluble blocking needle is arranged at the end, away from a corresponding spring, of each blocking block. A groove is formed in the inner wall of each vertical pipe, and each groove is matched with a corresponding blocking block. By means of the stepped type pouring device, the temperature of positions of the risers are the highest; sequential solidification of castings is achieved; and feeding distance of the risersis improved greatly.

The invention discloses a precoated sand shell mold casting technology and relates to a casting technology. According to the technical scheme, the precoated sand shell mold casting technology is characterized by comprising the following steps that S1, shell manufacturing is conducted; S2, boxing is conducted, wherein a shell mold is put into a box body, then the part between the outer portion of the shell mold and the inner wall of the box body is filled with steel shots, and compaction is conducted; S3, casting is conducted, molten iron liquid is poured into an inner cavity of the shell mold,cooling is conducted after casting, and a casting is formed; S4, discharging is conducted, the casting, waste sand and the steel shots in the box body are poured out together, the casting is separated out, the surface of the casting is cleaned and checked, and the casting is warehoused after being qualified; and S5, recycling is conducted, wherein the waste sand and the steel shots are separated,and the recycled steel shots are repeatedly utilized. Precoated sand comprises the following components including, by weight, 100-110 parts of crude sand, 3-5 parts of heat-resisting phenolic resin,1.2-1.5 parts of a curing agent, 0.1-0.3 part of a lubricating agent and 0.03-0.06 part of a coupling agent. After the shell mold makes contact with the high-temperature molten iron liquid, the precoated sand is not likely to be decomposed to generate a large amount of gas, the gas generation amount is low, on one hand, adverse effects are not likely to be generated on the casting, and on the other hand, damage to fitness of workers is lowered.

The invention relates to the foundry industry and discloses a sand core structure and a manufacturing method for a sand core. The sand core structure is simple and enables the core print of the sand core to be steadily and precisely positioned in a core print positioning tank, thereby guaranteeing the quality of a casting. The sand core structure and the manufacturing method for the sand core overcome the technical problems of dimensional deviation of a casting due to easy deflection of a sand core, severely impaired quality of the casting and the like when the bottom surface of the core print of the sand core is a sand strickling surface. The sand core structure comprises a core print seat; a cavity with an upward opening is arranged on the core print seat; the bottom of the cavity is provided with the core print positioning tank; the sand core is inserted into and connected with the core print positioning tank in a mating manner via the core print; an annular supporting boss horizontally extends on an internal wall surface close to the bottom of the core print positioning tank; a mating annular gap horizontally extends on the core print corresponding to the annular supporting boss; and the sand core is horizontally supported on the annular supporting boss through an upper annular surface corresponding to the annular gap.

The invention discloses a composite particle reinforced roller of a hot-rolling seamless steel pipe sizing mill or reducing mill and a preparation method thereof. Composite particles are composed of hardening particles, active wetting agents and matrix reinforcing agents. The composite particle reinforced roller of the sizing mill or reducing mill is cast after nodular cast iron matrix molten metal is reinforced; and the high-strength and high-toughness composite particle reinforced roller is obtained by conducting isothermal quenching and machining on the roller. The composite particle reinforced roller is resistant to abrasion and impact; the service life of the roller is prolonged by over two times; the production cost is lowered; the production efficiency of a steel pipe production enterprise is improved, and economic benefits of the steel pipe production enterprise are increased.

The invention discloses a rare-earth magnesium alloy preparation method. A pit-type resistance melting furnace and cooling speed-controlled pig casting equipment are adopted for melting under the protection of a CO2+SF6 mixed gas. The rare-earth magnesium alloy preparation method particularly comprises the following steps: heating the furnace up to 740-750 DEG C; adding pure magnesium preheated to 200 DEG C; injecting into the CO2+SF6 mixed gas; after the pure magnesium is completely molten, sequentially adding other alloys and an intermediate alloy; after complete melting, heating up to 760-780 DEG C; turning off the CO2+SF6 mixed gas; injecting into Ar gas; adding a refining agent for 6-10 min refining; after that, leaving to stand for 25-30 min; and when the temperature is lowered to 720-740 DEG C, casting in the cooling speed-controlled pig casting equipment to obtain the as-cast rare-earth magnesium alloy. The rare-earth magnesium alloy preparation method strictly controls oxidation in the alloy melting process, guarantees the alloy quality, reduces heat loss in the alloy melting process and ensures the alloy casting quality.

A casting method for glass mould blank belongs to the field of glass mould casting and comprises first manufacturing a wooden model base plate provided with a pair of bottle moulds, a pouring gate mould, a pouring channel mould and a filter screen according to the size of the glass mould blank; then arranging a model frame cover on the wooden model base plate, and filling pulverized coal sand in a containing cavity of the model frame; overturning the model frame filled with the pulverized coal sand and the wooden model base plate together, removing the wooden model base plate to obtain a casting mould, and arranging the filter screen into the filter screen cavity; arranging a pair of cold iron cores onto bottle mould cavities; pouring melted iron water from the pouring gate, enabling the iron water sequentially pass through the pouring channel to be filtered by the filter screen to enter the bottle mould cavities, and removing the cold iron cores, the model frame and the pulverized coal sand till the liquid level of the iron water reaches the horizontal height identical with the upper plane of the pouring gate to obtain the glass mould blank. The casting method for the glass mould blank has the advantages of improving casting efficiency of the glass mould blank, can not cause body hurt to an operator, ensures physical properties of a glass mould, has economic efficiency, and can ensure the quality of a cast.

The invention discloses a transfer device of a casting mould, and the transfer device reduces labor intensity of workers, is high in casting quality, and improves production efficiency. The transfer device comprises a working platform, wherein two guide rails which are parallel to each other are arranged on the working platform; a movable supporting base is arranged on the two guide rails; one drive device is connected with the movable supporting base, and is used for driving the movable supporting plate to translate along the two guide rails; a translation air cylinder is arranged on the movable supporting base; a piston rod of the translation air cylinder extends to one side of each of the two parallel guide rails in the horizontal direction, and is perpendicular to the two guide rails; a mounting arm parallel to the two guide rails is fixedly arranged on the piston rod of the translation air cylinder; and the two ends of the mounting arm are separately equipped with mould loading devices.

The invention provides a high-efficiency high-throughput continuous casting and rolling system and process for titanium alloy bars. The system involves a feeding mechanism, a smelting chamber, a flowdividing chamber, a flow dividing mechanism, a multi-channel crystallization mechanism, pull-down mechanisms, material receiving mechanisms, conveying belts and a rolling mechanism; the smelting chamber is provided with a water-cooled copper furnace hearth, and a raw material is heated and smelted through plasma guns to form molten metal; the metal molten is guided into the flow dividing chamber and flows to the multi-channel crystallization mechanism in a divided mode, and the multi-channel crystallization mechanism is provided with a plurality of crystallizers in one-to-one correspondence with flow dividing openings; the material receiving mechanisms are arranged below the multi-channel crystallization mechanism and are provided with material receiving pipes in one-to-one correspondencewith the crystallizers, the material receiving pipes are opened after being turned over, titanium alloy billet bars slide onto the conveying belts, and the conveying belts convey the titanium alloy billet bars into the rolling mechanism for continuous rolling forming; and the crystallizers are water-cooled copper crystallizers, the crystallizers are vertically arranged at equal intervals, and thermal barrier material coatings are arranged on the outer surfaces of the crystallizers.

The invention provides hot plasma casting roller repairing device and method, relates to the technical field of metallurgical engineering, and solves the technical problems of time and energy consumption, high cost and low efficiency. The roller repairing device comprises a melting system and a casting system for conveying and connecting materials, a plasma heating system, an auxiliary system, a walking device and a lifting device, wherein the melting system is arranged on the walking device; and the heating system is movably connected with the walking device through the lifting device, so that the heating system can lift up and down in the vertical direction relative to the melting system. According to the hot plasma casting roller repairing device and the method provided by the invention, the materials used for plasma melting roller repairing are adopted and can be quickly heated and melted into a liquid state, so that the energy and the materials are saved, and the repairing cost isreduced; the labor intensity is reduced, the automation degree is improved, and the working environment is improved; the repairing period is shortened, the enterprise burden is reduced, and the utilization ratio of equipment and fund is improved; and large-scale, batched, serial and automatic repairing can be realized.

The invention relates to a water-based cast steel coating which comprises the following raw materials in parts by weight: 50-70 parts of kyanite powder, 0.5-3 parts of attapulgite, 1-5 parts of magnesium chloride, 0.5-6 parts of barium chloride, 0.2-2 parts of resins, 0.1-3 parts of silica gel and 0.1-3 parts of an emulsifier. The water-based cast steel coating provided by the invention is applicable to brush-coating resin sands and synthesized sand moulds. Magnesium chloride and barium chloride are added into the coating for easy shelling and preventing sand burning, so that the strength of the coating is improved, the resistance of the coating to high temperature molten steel is improved, the roughness on the casting surface is effectively improved, and the quantity of waste products is greatly reduced. The water-based cast steel coating has a greater market prospect.