31results about How to "Increase pouring temperature" patented technology

The invention relates to a plaster casting method for a large-sized complex thin-walled magnesium alloy part. The method comprises the following steps of coating the surface of an assembled form with a coating in situ, and arranging shapeless cold iron on a hot spot part, wherein a mixture for manufacturing the shapeless cold iron comprises the following components in percentage by mass: 1.25 percent of phenolic resin, 0.4 percent of toluenesulfonic acid, 1 to 1.5 percent of boric acid, 2 percent of bentonite and the balance of 70 to 140-mesh chromite sand; pouring a casting in an adjustable pressure casting device, arranging a plaster mold poured by the form at the casting position of the adjustable pressure casting device, filling a tank with dry air or a CO2 atmosphere with SF6 content of 0.1 to 1.0 percent, and performing vacuum casting and pressurized solidification, wherein the casting temperature is 710 to 750 DEG C, vacuum degree for primary mold filling is minus 0.6Mpa to minus 0.8Mpa, and the solidification pressure is 0.020 to 0.025Mpa. According to the method, oxidization can be prevented, the mold filling capability can be improved, shrinkage cavities and shrinkage porosities in the casting are reduced, and the obtained magnesium alloy casting is higher in density.

The invention discloses an iron pattern sand-lined casting process, belonging to the technical field of casting. According to the technical problem to be solved, the invention provides an iron pattern sand-lined casting process through which the casting dimension is high in precision, the surface smoothness is high and the deformation amount is small. With the adoption of the technical scheme, the pouring temperature of molten iron is 1450 to 1600 DEG C, the pouring time is less than 60 seconds, and the stress deformation of the casting is reduced by other process conditions. The axle housing casting manufactured by adopting the process disclosed by the invention is high in surface smoothness, high in dimensional accuracy and small in deformation amount.

A process for casting a gearbox body of a centrifugal compressor comprises the following steps: 1), preparing a mould box, wherein a gearbox adopts two resin sand box molds, a plurality of U-shaped ceramic pipes are arranged on the parting surface of the lower box, two ends of each U-shaped ceramic pipe are connected with a filter and a horizontal runner, a U-shaped ceramic pipe is arranged at the bottom of the lower box, and two ends of the U-shaped ceramic pipe at the bottom of the lower box are connected to the horizontal runner and a flange at the bottom of the lower box, so as to form an upper stepped inner runner, a middle stepped inner runner and a lower stepped inner runner for feeding iron liquid; 2), carrying out brushing or flow coating, that is, conducting brushing or flow coating on a cavity and a mud core; 3), carrying out mold assembling, wherein residual sand in the cavity and the mud core is cleaned up, the mud core is lowered into the cavity smoothly, a filter disc is placed into a filter, a box sealing strip and glue are placed, positioning pins are placed into positioning holes, and mold assembling is carried out smoothly; and 4), pouring: a casting head is well placed, an air exhaust core is well surrounded by sand, the pouring temperature is controlled to be 1400 to 1350 DEG C, and the pouring time is controlled to be 80 to 90 minutes. According to the invention, the problem that casts produced according to the original process have scrapped gas pores is effectively solved; the production cost is reduced; and the productivity effect is improved.

The invention discloses a process for fabricating a template pipe-containing cast part in a manner of pre-embedding a stainless steel pipeline. The process comprises the following steps: 1) fabricating a wood pattern according to a drawing, and manufacturing a water outlet pipe groove in an inner cavity of the wood pattern; 2) selecting an appropriate sand box according to the wood pattern, and fabricating a sand mold of a lower box with the water pipe groove surface being upwards; 3) selecting an appropriate special upper box after finishing the sand mold of the lower box, fixing the upper box on the lower box, and then assembling an appropriate quantity of tooling bars into a track groove in a sand box; 4) fixing the tooling bars, and then beginning to fabricate a sand mold of the upper box; 5) bending a water pipe; 6) dividing the fabricated sand mold; 7) fixing the tooling bars with a stainless steel pipe, so that the periphery of the stainless steel pipe cannot directly contact the sand mold, and reserving a gap; 8) closing the boxes, and casting; and 9) solidifying and cooling a to-be-cast part, taking out the to-be-cast part, separating the upper box, and transporting the cast part to a cleaning region. According to the process disclosed by the invention, fastening and connection between the water pipe and the sand boxes are ensured, stress deformation of the stainless steel pipe caused by heating is removed, and thus not only is the geometrical tolerance of the water pipe ensured, but also the yield is improved.

The invention relates to a heat treatment method of large heat-resistant high alloy steel castings in the technical field of steel casting heat treatment. The heat treatment method of the large heat-resistant high alloy steel castings includes the process of high-temperature diffusion annealing, gating and risering system cutting, normalizing air cooling, primary tempering and secondary tempering,and it is set that carbon arc air gouging dressing is performed on the surfaces of the castings between the primary tempering and the secondary tempering. The method solves the problem that the largeheat-resistant high alloy steel castings with a ZG12Cr9Mo1CoNiVNbNB material are prone to cracking in the heat treatment process, and makes various normal temperature and high temperature mechanicalproperties of the steel castings meet the using requirement.

The invention discloses casting infiltration coating used for a ferrous matrix composite, a preparation method, and a method for preparing a casting infiltration coat by means of the casting infiltration coating. The casting infiltration coating comprises the following components including 1.8-2.2% of rosin resin, 0.9-1.1% of phenolic resin, 0.4-0.6% of polyvinyl butyral, 1.0-1.5% of organobentonite, 4.0-6.0% of solvent naphtha, 11-13% of silicon carbide, 8-12% of ferrochromium powder and the balance absolute ethyl alcohol. The casting infiltration coating used for the ferrous matrix compositehas the advantages of good suspension property, high strength and good breathability and levelling property, and meanwhile, coating is moderate in viscosity and good in brushability. According to detecting results, the viscosity change rate based on change of the rotating speed is above 0.057, the 2h suspension property is above 99.9%, the 24h suspension property reaches above 87.6%, the shakeoutflushing amount is above 0.14, the breathability can reach above 2.0, and the levelling property reaches above 510 mm.

The invention discloses a method for preparing hard xylitol candy. The method comprises the following steps: weighing 90% of a formula amount of xylitol, heating the weighed xylitol to 100 DEG C in order to melt the xylitol, and performing heat insulation at 93-95 DEG C; adding other raw materials and auxiliary materials to the obtained sugar solution in a heat insulation state, and performing heat insulation; stirring all above materials, adding the remaining 10% of the formula amount of xylitol, and performing uniform stirring; allowing the obtained sugar solution to automatically flow intoa casting trough through a 92-96 DEG C interlayer heat insulation pipeline; and cooling, demolding and packaging the sugar solution. The method solves a problem that the hard xylitol candy cannot be continuously produced for a long term. The casting temperature is increased, so the crystallizing and demolding time is prolonged, the obtained product has fine particles, a uniform size and a beautiful appearance, the yield is large, and the energy consumption is low.

The invention discloses a thin-walled heat resistant steel exhaust gas manifold casting method, and belongs to the technical field of heat resistant steel exhaust gas manifold casting. The casting method comprises the following steps of core manufacturing, modeling, smelting, pouring and sand shakeout. Through the reasonable design of the amount of molten iron entering a pouring channel and the section ratio of each unit in a pouring system and strict control of the iron mold sand covering layer thickness, the mold cavity exhaust gas system and pouring temperature and the sand shankout box opening time, the thickness of the prepared exhaust gas manifold is 3.2-3.6mm, the wall is thin, the grain size level is 5.5, and the technical property reaches the required index. The prepared exhaust gas manifold has the thin wall and low weight, is stable in property, solves the problem that a common wet sand technology is difficult to form, effectively lowers the integral weight, and achieves light-weight design of an engine.

The invention provides a special sand box for plate type tube-containing castings. The special sand box comprises a lower box and an upper box matched with the lower box, wherein the upper box is fixed on the top of the lower box; a wooden mold is arranged in the upper box; a water tube seat is arranged in the inner cavity of the wooden model; a stainless steel tube is arranged in the water tube seat; a rail groove is formed in the upper part of the upper box; a tool rod is connected to the wooden mold and located directly above the water tube seat; the head of the fixture rod is fixed directly above the water tube seat and contacts with the water tube seat; a slider is arranged on the rail groove; the tail of the tool rod is in threaded connection with the slider; a threaded hole is formed in the slider; the slider is fixed on the rail groove of the sand box by use of a fixing screw via the threaded hole; a fixing screw with a tying wire with the diameter of 1mm penetrates through the head of the tool rod, a gap of 3-5mm is reserved between the end portion of the fixing screw and the head of the tool rod, and after the bent stainless steel tube is placed in position, the stainless steel tube is fixed by use of the tying wire on the fixing screw. The special sand box for plate type tube-containing castings is capable of achieving the purpose of replacing a red copper tube with the stainless steel tube; as the price of the stainless steel tube is about 1/3 of that of the red copper tube, the cost is saved.