32results about How to "Increase pouring temperature" patented technology

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 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 template type pipe casting-containing stainless steel water pipe fixing structure. The structure comprises a sand mold upper box, wherein a rail is arranged at the upper end of the sand mold upper box; slide blocks are arranged in the rail at intervals; a through hole is formed in the middle of each slide block; a connecting rod is connected into each through hole; one end of each connecting rod is connected in the through hole in the corresponding slide block through screw threads and extends into the upper part of the corresponding through hole; the lower end of each connecting rod is positioned at the bottom of the sand mold upper box; a screw hole is formed in the lower end of each connecting rod; a fixing screw with the diameter of 1mm binding wire penetrates through each screw hole; a clearance with the diameter of 3 to 5mm is formed between the end part of each fixing screw and the bottom end of the corresponding connecting rod; the fixing screw is used for connecting a stainless steel water pipe; a binding wire on each fixing screw is used for fixing the stainless steel water pipe; the fixed stainless steel water pipe is in a suspension state; the surrounding of the stainless steel water pipe is not in direction contact with the sand mold upper box and a clearance is reserved, otherwise, the cast steel pipe is exposed on the surface of a casting.

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.

The invention discloses a full-mold casting method of resin sand without a dead head. The full-mold casting method comprises the steps of manufacturing a pattern and a casting system, molding, smelting casting, forming and cleaning, wherein working allowance is preset on the upper surface of the manufactured pattern, and no dead head is arranged in the molding step; the casting system comprises a plurality of sprues with funnel-shaped pouring cups at the top ends, the volume of the pouring cup is more than that of the sprue, the bottom of the sprue is communicated with a cross gate, the lower end surface of the cross gate is leveled with the bottom surface of the pattern or is slightly higher than the bottom surface of the pattern, the length of the cross gate is 95% of the length of the pattern, and a plurality of ingates communicated with the pattern are arranged on the cross gate at intervals; and molten metal is poured by the plurality of pouring cups simultaneously during casting, and the speed of filling the molten liquid into each pouring cup can ensure the molten liquid in the pouring cup to close the sprues. According to the full-mold casting method, no dead head is arranged, no flue gas and no pollution are caused during production, the production steps are simplified and the cost is reduced.

The invention discloses a bearing block casting process. The bearing block casting process. The bearing block casting process includes: heating to melt smelting furnace charge in an electric furnace,and discharging when the temperature reaches 145 DEG C, wherein the smelting furnace charge comprises, by weight percentage, 30-45% of pig iron, 35-55% of waste steel, 5-20% of foundry returns and 1%of carburant; during molten iron discharge, washing antimony into a casting ladle along with flow, and injecting into balling ladle; after the molten iron is injected into the balling ladle from a ladle mouth, refining the molten iron in the first pit of the balling ladle, and subjecting the molten iron to balling inoculation in the second pit and the third pit of the balling ladle after the molten iron overflows the dam of the balling ladle, wherein the balling agent is Elkem5813, the balling agent is covered with an Elkem inoculant, the inoculant is covered with a covering agent, and the balling temperature is 1440-1460 DEG C; when the temperature of the molten iron reaches 1350-1370 DEG C, using a high-temperature slow pouring process coordinated with a fash pouring method to pour a wind power cast in a resin sand mould. The bearing block casting process has the advantages that pouring temperature is increased, pouring speed is lowered, slagging is benefited, and cast surface performance is increased.

The invention discloses a manufacturing method of a breaking hammerhead and the breaking hammerhead. The manufacturing method of the breaking hammerhead comprises the following steps that a, hydroxy iron powder, titanium carbide powder and graphite powder are mixed, compression molding is conducted after absolute ethyl alcohol is added to serve as a molding agent, and a long strip-shaped panel blank is made, wherein the mass of the titanium carbide powder accounts for 20%-40% of the total mass of the raw materials; b, the obtained long strip-shaped panel blank is sintered in a vacuum furnace, so that a titanium carbide steel-bonded hard alloy panel is obtained; c, molten carbon steel obtained after smelting is poured into the hammerhead by using green sand for hammerhead molding, and the titanium carbide steel-bonded hard alloy panel obtained in the prior step is inlaid in the end of the hammerhead in a cast mode; d, falling sand and a casting head are removed; and e, the hammerhead is quenched in a muffle furnace and then taken out, and water quenching is conducted on the hammerhead. The internal tenacity of the hammerhead is good, and the external hardness of the hammerhead is high; and the hammerhead is not prone to brittle fracture in use, base metal and the panel are bonded precisely, the bonding strength is improved, the surface hardness of the hammerhead is improved, and accordingly the abrasion resistance of the hammerhead is improved.

Provided is a forging method for ultra-high temperature soft core of a steel ingot, comprising firstly subjecting a cast steel ingot with a liquid core to ultra-high temperature demoulding; then placing same in a temperature-holding car to a uniform temperature and conveying to a forging press, subjecting the steel ingot with the liquid core to high-temperature and pressure-maintaining forging to fully crush dendrites at the solidification end, which forms a large amount of equiaxial crystal structures, eliminates the shrinkage porosity and looseness, and alleviates the dendritic crystal segregation; finally, performing a conventional forging to fully refine the crystalline grains and structures. The above-mentioned method breaks through conventional methods for forging mould cast steel ingots only after full solidification. The ultra-high temperature demoulding of a steel ingot with a liquid core, creates semi-solid state structure with excellent fluidity in the core of the steel ingot and a large temperature difference between the surface and the core, and after combination with a subsequent heavy pressurization and pressure-maintaining method, a forced feeding and pressure solidification can be achieved, which not only solves problems of shrinkage porosities, looseness, segregation etc., in the centre of the steel ingot to improve the metallurgical quality, but also reduces the riser weight and the heating number for forging, and prolongs the mould service life.