38results about How to "Low casting temperature" patented technology

The invention discloses a method for manufacturing a valve retainer, which comprises the following steps: arranging a sprue on a mould; and carrying out smelting, casting, demoulding, heat treatment and ground finishing on metal, wherein the mould is a directly molded mould for the valve retainer. Compared with the prior manufacturing method, the method for manufacturing the valve retainer saves four steps of sliping a head, boring an inner hole, digging up an excircle and cutting off. Therefore, the method simplifies the production steps, saves a large amount of labors, reduces the equipment input and energy consumption, shortens the production cycle and reduces the production cost.

The invention discloses a molten steel cleaning agent which is used for removing suspended non-metallic inclusions in molten steel in a molten state and gas dissolved in a metal solution, improving the quality of the molten steel and reducing the slag hole and pore rate of a casting product. The molten steel cleaning agent comprises 70%-80% of cement and 30%-20% of fluorite powder. By adding the molten steel cleaning agent into a furnace, the quality of molten steel can be improved, the slag hole and pore rate of casting products is reduced, and the percent of pass of the casting finished products is greatly increased. Different from the situation that similar products are limited to slagging in a ladle outside a furnace, extra temperature drop is caused by standing of molten steel, and heat is lost, the in-furnace slagging characteristic of the molten steel cleaning agent can reduce furnace wall slag adhesion, lower the furnace wall thickness, improve the induction heating efficiencyand reduce the energy consumption, the use amount of the molten steel cleaning agent is smaller than that of similar products on the market, the capacity of removing gas and inclusions in molten steelis better, the economic benefit is higher, and the molten steel cleaning agent is suitable for wide application and popularization.

A rotary drum and vibratory conveyor system including a single walled rotary drum positioned above a vibratory conveyor assembly. The rotary drum may be segmented with each segment having end flanges that are connected to an adjoining segment with bolts. A section or sections of the rotary drum have perforations covered by a dust hood that allow sand and media to fall from the drum through a funnel structure onto the conveyor assembly. The vibratory conveyor assembly includes upper and lower conveyors, where the upper conveyor collects the media falling from the drum and passes the sand to the lower conveyor. The media may be redirected back to the drum inlet to be reused.

The invention discloses a manufacturing method of a Roots blower impeller or rotor. The manufacturing method is to preheat the template, cavity and core of the mold to 180-200°C, apply a release agent after heating, then fix the cavity on the lower template, load the core, and cover it. Formwork, fix the pouring sleeve, pour the alloy smelted according to the general method into the mold, the casting temperature is 450°C, after hardening, open the mold and take out the finished product, the casting is quenched at 180°C and placed at room temperature for 48 hours; the mold after mold opening Apply release agent, close the mold for secondary casting, and the mold does not need to be reheated. The alloy of the invention has low smelting temperature, simple casting process, is convenient for recycling and back casting, and better realizes resource reuse.

The invention discloses die-cast zinc alloy with high flowability and a preparation method thereof. The alloy comprises the components by weight percent: 4.51-6.0% of Al, 0.01-0.08% of Mg, 0.5-0.7% of Cu, 0.01-0.02% of Li, 0-0.1% of Ti, 0-0.02% of B, less than 0.02% of inevitable impurity elements such as Pb, Cd, Fe, Sn in total, and the balance of Zn. The preparation method comprises the steps of: firstly, putting an Al ingot into a smelting furnace, heating to 680-720 DEG C; adding a covering agent after a part of molten aluminum appears; cooling to 650-680 DEG C after the Al ingot is completely melted; adding a Zn ingot, Al-Mg, Al-Cu and Zn-Li middle alloy, refining and drossing; adding B and Ti elements, agitating, drossing and cooling to 420-560 DEG C; and stewing, drossing and casting. Compared with common die-cast zinc alloy, the flowability of the die-cast zinc alloy provided by the invention can be improved by over 70%; the grain size of the die-cast zinc alloy is effectively refined; the comprehensive mechanic performance of the alloy is improved.

The invention relates to a high-carbon and high-chromium 9Cr18 martensite stainless steel shaft forging preparation technology. During smelting, the weight percentage of carbon in stainless steel is controlled to be 0.90-0.92%, and the weight percentages of other ingredients are as follows: 17.0-17.5% of Cr, 0.50-0.55% of Si and 0.40-0.45% of Mn; the casting temperature is controlled to be 1450-1480 DEG C; 10.5 ton of electroslag ingots are adopted for forging, the electroslag ingots are hot-charged and heated up, the heating temperature is 1140-1180 DEG C, the initial forging temperature is 1000-1120 DEG C, the finish forging temperature is higher than or equal to 950 DEG C, and the returning heating-up time cannot exceed 2 hours; after forging, normalizing and isothermal annealing are conducted, the normalizing temperature is 850-950 DEG C, and air cooling is conducted to obtain the temeprature of 650-750 DEG C for isothermal annealing. The high-carbon and high-chromium 9Cr18 martensite stainless steel shaft forging preparation technology provided by the invention controls the chemical compositions, the forging heating, the initial forging temperature, the finish forging temperature, the deformation mode, the deflection and the after-forging heat treatment temperature of steel to enable twin-crystal carbides in the steel to be moved or improved.

The invention provides a process method for preparing a low residual thermal stress amorphous alloy, comprising: step S1, select a reference alloy, and use a non-metallic element that forms a low-melting point alloy with a metal element to partially replace the non-metallic element that forms a high-melting point alloy with a metal element. Form a series of alloys with different components by means of metal elements, and measure their viscosity at different casting temperatures to establish the relationship between viscosity-casting temperature-composition; step S2, measure different cooling conditions for the series of alloy melts at different casting temperatures Set up the relationship of cooling condition-solidification temperature-casting temperature-composition; step S3, at first, according to the relationship obtained in step S1, select the alloy composition of low viscosity and set the casting temperature according to the viscosity standard; then, according to the selection The alloy composition, the set casting temperature and the relationship obtained in step S2, select the cooling conditions corresponding to the increase of the supercooled solidification temperature; finally, an amorphous alloy is obtained.

The invention relates to a method for controlling a large-scale nodular iron cast coagulation tissue. The method comprises the following steps of: placing a cooling body manufactured by graphite, gray cast iron and copper on a bracket; controlling nodular iron liquid flow and temperature reduction by adjusting an inclined angle to the horizontal direction and the overflow length and controlling the number of iron liquid crystal nucleuses after treatment, wherein the surface of the cooling body is a semicircular concave surface with the curvature radius of 200 to 500 mm and is coated with fireproof coating, the cooling body is hollow and cooling water can be introduced into the cooling body; allowing the nodular iron liquid subjected to nodulizing inoculation to flow through the cooling body and then enter a casting cavity; and properly reducing the casting temperature of the nodular iron liquid and generating a large number of crystal nucleuses through chilling action of the cooling body so as to refine the large-scale nodular iron cast coagulation tissue and prevent graphite distortion.

The invention relates to the field of iron and steel metallurgy, in particular to a method for controlling segregation at the center of a slab. The method specifically includes the following steps: (1) formulating an alloy steel wire of the same type as the target pouring steel; Calculate the enthalpy value of the molten steel in the tundish; (3) calculate the heat consumed to achieve thermal balance according to the target temperature of the molten steel in the tundish; (4) feed the alloy steel wire described in (1) into the molten steel to supplement the heat. The invention effectively reduces the casting temperature of molten steel in the continuous casting process, thereby improving the problem of central segregation and improving the homogeneity of the cast slab.

The invention discloses a method for manufacturing a valve retainer, which comprises the following steps: arranging a sprue on a mould; and carrying out smelting, casting, demoulding, heat treatment and ground finishing on metal, wherein the mould is a directly molded mould for the valve retainer. Compared with the prior manufacturing method, the method for manufacturing the valve retainer saves four steps of sliping a head, boring an inner hole, digging up an excircle and cutting off. Therefore, the method simplifies the production steps, saves a large amount of labors, reduces the equipmentinput and energy consumption, shortens the production cycle and reduces the production cost.

The invention provides a large-scale complex magnesium alloy component near liquidus pressure difference casting method, belonging to the field of magnesium alloy casting, based on the principle of controlled diffusion solidification, by mixing two kinds of alloy mother liquids with different components and different temperatures to obtain a near liquid phase Magnesium alloy casting liquid with linear temperature and high fluidity, based on the anti-gravity casting method, uses pressure to drive magnesium alloy casting liquid to fill the sand mold from bottom to top, and cools and solidifies at a pressure higher than the environment to complete the casting. The present invention also provides a casting device applied to the above casting method, including a first lower tank and a second lower tank for holding two kinds of mother liquors, a middle tank for mixing mother liquors, an upper tank for filling mold tank, a deflector is provided between the lower tank and the middle tank, the lower tank and the middle tank are connected through a riser pipe, and the middle tank and the upper tank are connected through a riser pipe. The invention can effectively reduce the casting temperature of the magnesium alloy, and avoid burning caused by high temperature during resin sand mold differential pressure casting.

The invention belongs to the technical field of metal functional material preparation, and particularly relates to a process method for regulating and controlling casting temperature of an amorphous alloy melt. The method comprises the following steps that S1, association relationships between different cooling parameters and the lowest casting temperature of the amorphous alloy melt are established; S2, according to the association relationships in the step S1, the lowest casting temperature and the related cooling parameters are selected; and S3, under the conditions of the set lowest casting temperature and the selected cooling parameters, the amorphous alloy melt is rapidly solidified into an amorphous alloy thin strip. According to the provided process method for regulating and controlling the casting temperature of the amorphous alloy melt, the method is suitable for preparing an amorphous alloy material from an alloy melt through a rapid cooling method and is particularly suitable for preparing an iron-based amorphous alloy; and particularly, the method can reduce the casting temperature of the amorphous alloy melt by improving the cooling capacity of a cooling roller underthe condition that components of the iron-based alloy melt greatly fluctuate, and then the performance of the amorphous alloy is improved.

The invention relates to a production process of a high-temperature structural ceramic / metal composite pipe for an aluminum alloy die-casting machine. The composite pipe includes a ceramic inner lining, a metal jacket and an end cap; the production process of the composite pipe includes ceramic lining processing, a metal jacket and an end cap Processing, ceramic lining, metal jacket and end cap assembly and adaptation; ceramic lining processing technology includes raw material preparation, grinding and pulping, workpiece molding, green body drying, high temperature firing, inner and outer circle processing; metal jacket and end cap processing technology Including cutting and blanking of metal pipes and end caps, rough machining of inner and outer circles of metal pipes and end caps, heat treatment, finishing machining of inner and outer circles of metal pipes and end caps; assembly and adaptation process of ceramic linings and metal jackets, end caps including measurement inspection, combination Assembly, thermal adaptation test. Through the composite of metal tube and ceramic tube, the corrosion resistance and wear resistance of the material tube are greatly improved, and the service life is long; the thermal conductivity of the composite material tube is low, and the energy consumption is reduced; the strength and toughness are good, and the manufacturing cost is low. The production cycle is short.