93results about How to "Avoid slag inclusions" patented technology

The invention relates to a stainless steel water meter shell which is cast by using a lost foam process. The fireproof paint of the lost foam comprises 15 parts of zirconite powder, 15 parts of ferrochromium powder, 12 parts of pyrophillite powder, 10 parts of bauxite, 5 parts of magnesium powder, 5 parts of limestone powder, 4 parts of brown emery powder, 1 part of white emery powder, 2.5 parts of lithium-base bentonite, 2 parts of carboxymethyl cellulose, 1 part of palygorskite, 2 parts of sodium silicate, 2 parts of aluminum sulfate, 1.5 parts of VAE (Vinyl Acetateethylene Emulsion), 0.6 part of n-butyl alcohol, 0.2 part of n-caprylic alcohol and 25 parts of water; an energy converter intubation tube with internal and external threads is arranged inside an inclined tube of the water meter shell; and after being inserted, an energy converter is not directly contacted with a water fluid, so that the service life of the energy converter is prolonged and the stainless steel water meter shell has a wide application prospect.

The invention relates to a semisolid alloy preparation method, in particular a method for preparing a spherical primary crystal semisolid alloy through centrifuging and chilling. The method comprises the following steps of: first, melting the alloy to a certain temperature; and then pouring the melt in a centrifugal barrel; throwing the melt to the inner wall of a chilling barrel after rotating the melt through centrifugal force; carrying out mixed convection on the melt in the centrifugal barrel under the double effects of centrifugal force and chilling force; and finally, obtaining a non-dendritic semisolid alloy blank or slurry with spherical or granular primary phase under the mutual effect of numerous nucleation and dendrite breaking of the outer barrel. The method for preparing the spherical primary crystal semisolid alloy through centrifuging and chilling, provided by the invention, has the characteristics of simple equipment, high production efficiency, wide application range of alloy, fine and rounded primary phase with semi-solid structure and the like, and can be used for the preparation and molding production of the metal semisolid alloy.

The invention provides a welding method of a hastelloy tube. The welding method comprises the steps of preparing before welding, fully welding, cleaning welding seams after welding and repairing the welding seams. By adopting the welding method of the hastelloy tube, the hastelloy tube can be smoothly welded, higher welding quality is obtained, and the qualified rate of the welding seams reaches 99%.

The invention discloses casting powder for a continuous casting crystallizer. The casting powder comprises raw materials in parts by weight as follows: 3.5-15 parts of fluorite, 35-55 parts of aedelforsite, 5-15 parts of alkali, 0-2 parts of lithium carbonate, 0-10 parts of diaspore, 0-6 parts of a cement clinker, 1-5 parts of magnesia powder, 2-5 parts of pyrolusite, 0-8 parts of sodium fluoride, 0-5 parts of barium carbonate, 0-5 parts of bentonite, 1-4 parts of coke, 0-8 parts of a carburant, 1-3 parts of carbon black and 1-2 parts of a binder. According to the casting powder, the preparation cost is low; the recovery rate of the casting powder is larger than or equal to 98.5%; the color of the casting powder is uniform; the granularity is uniform; the granulation rate is high; dust is reduced; the melting point of the casting powder is low; the viscosity is low; after the casting powder is added into the crystallizer, the casting powder is melted uniformly and shows excellent spreadability, heat retaining property and adsorptive property; heat is transferred uniformly all around the crystallizer, and the lubrication is excellent; and defects such as concave pits, impurities and the like don't exist on the surface of a casting blank, the internal quality is excellent, and the qualified rate of the casting blank is equal to or larger than 99.8%.

The invention discloses a casting method for a flywheel. The casting method comprises the following steps: a, preparing an upper sand shell: manufacturing on a core shooting machine to prepare the upper sand shell; b, preparing a lower sand shell: manufacturing on another core shooting machine to prepare the lower sand shell; c, manufacturing a sprue; d, closing a die: putting the lower sand shell into a lower iron shell; covering the top of the lower sand shell with the upper sand shell; after closing the upper sand shell and the lower sand shell, forming a cavity for casting the flywheel; then covering a sprue section of the upper part of the upper sand shell with an upper iron shell; finally, tightly pressing the upper iron shell and the lower iron shell with a U-shaped clip; e, arranging the sprue; f, pouring; g, de-molding: taking out a flywheel casting blank; h, cleaning the sprue. According to the casting method for the flywheel, casting defects of sand clamping, slag clamping, air pores, loosening and the like in a traditional casting process can be effectively prevented; the casting method for the flywheel is efficient and low in cost; the effective utilization rate of molten iron is high; in a technological process, the core shooting machine is improved on the basis of outsourcing; the improved core shooting machine can be used for preventing the defect that a sand spraying nozzle is blocked by humid hardening of a sand covering film.

The invention relates to an inverted construction method for template engineering of a cast-in-place shear wall structure system, which specifically comprises the following operation steps: step one, synchronously carrying out (a) a process of setting up a support frame and mounting a beam plate template and (b) a process of welding and binding wall steel bars; step two, (c) a process of binding beam plate steel bars and (d) a process of mounting a wall template; and step three, (e) a process of integrally casting wall panel concrete. The method is suitable for the industrial and civil engineering adopting a shear wall, in particular a short-pier shear wall structure system, is also suitable for scattered-split support templates or steel frame combined templates, and is further suitable for all steel supports adopted by the beam plate template; the work efficiency is remarkably improved, and the construction period of a main body structure is shortened by about 40 percent compared with the prior construction method; the engineering quality is ensured, namely the root of the wall is ensured to be clean, the dislocation and slag inclusion are prevented, the quality of a joint of the beam plate and the wall is ensured, and the verticality of the wall is ensured; the construction safety is ensured; and the construction period is saved by about 40 percent.

The invention discloses mold powder for continuous casting of low nickel and high manganese stainless steel and a preparation method thereof. The mold powder comprises the following chemical compositions in percentage by weight: 38.0 to 42.0 percent of CaO, 32.8 to 38.0 percent of SiO2, 3.6 to 5.0 percent of MnO, 2.0 to 4.0 percent of MgO, 3.0 to 4.0 percent of Al2O3, 10 to 14 percent of fluxing agent containing NaO, F and Li2O, and 1.5 to 2 percent of Fc, wherein the ratio of the Cao to the SiO2 is 1.0-1.28. The preparation method comprises that: various raw materials are mixed and pelletized; and the pellets are melted in a liner-free furnace with water-cooling wall, subjected to water quenching, drying and crushing, added with a carbon material, namely 1.5 to 2.0 percent of Fc, and then prepared into hollow spherical mold powder in a spray prilling tower. Compared with the prior art, the mold powder has the advantages of eliminating vertical cracks on the surface of a casting blank, preventing cinder inclusion on the surface of the casting blank, avoiding oscillation marks on the casting blank, reducing surface conditioning of the casting blank, and having the surface quality of a slab equal to 304 austenitic stainless steel.

Thin layer repair welding technique for forging mould cavity overcomes the shortcomings in traditional method with much cost, great time consumption and less repair times, which uses series steps comprised integral heating welding, circle-to-mid turns and multiple layers welding of controlling layer thickness to cut repair time and cost obviously, reliable for quality, fit to repair more than ten times and prolong mould service life.

The invention provides a manufacturing method of a coupler knuckle, which comprises the following steps of blanking, heating for the first time, free forging, heating for the second time, die forging for the first time, trimming for the first time, heating for the third time, die forging for the second time, trimming for the second time, processing, heat treatment and flaw detection, wherein in the step of processing, the pattern draft of a blank making piece is processed; in the step of heat treatment, the quenching and tempering treatment is performed on the blank making piece; in the step of flaw detection, the flaw detection is performed on the surface of the blank making piece; if the qualification is obtained after the flaw detection, the product manufacturing is completed; and if the qualification is not obtained after the flaw detection, the product is moved to a waste area. According to the manufacturing method of the coupler knuckle, the coupler knuckle forging process is determined to be the free forging blank making, two-time die forging and two-time trimming production processes in accordance with the structural features of a forging coupler knuckle. After the coupler knuckle which is produced by adopting the forging process is used, casting defects such as air holes, slag inclusion, shrinkage porosity and the like of the casting coupler knuckle can be completely avoided, the internal quality of the coupler knuckle is guaranteed, and the service life of the coupler knuckle is prolonged.

The invention discloses a method for producing a lining plate of a ball mill by adopting a rolling technology. The method comprises the following steps: (1), waste steel materials are arranged in a medium-frequency furnace for smelting; (2), molten steel is subjected to sampling and testing to detect the content of each element in the molten steel, and certain quantities of trace elements are added in so as to allocate the content of each element in the molten steel; (3), modification is performed; (4), the molten steel is poured into a steel blank; (5), when the surface temperature of the steel blank is lowered to 850-950 DEG C, the steel blank is rolled into a steel rod; (6), the steel rod is cut into workblanks of which the lengths and the end part shapes are the same as those of the to-be-formed lining plate of the ball mill; (7), the workblanks are polished; and (8), thermal treatment is performed. According to the method, the lining plate of the ball mill which is produced by adopting the rolling technology is compact in inner structure, so that the lining plate of the ball mill has good mechanical strength, impact toughness and abrasive resistance; the labor intensity of workers and production cost are lowered; and the production efficiency and economic benefit are improved.

The invention relates to a lost foam coating and a preparation method thereof. The coating comprises the following components in parts by weight: 30-40 parts of bauxite clinker, 15-25 parts of magnesium oxide powder, 1-3 parts of sodium-based bentonite, 0.5-1.5 parts of CMC (Carboxyl Methyl Cellulose), 0.5-1.5 parts of polyvinyl alcohol, 0.3-0.8 part of phenol-formaldehyde resin, 0.2-0.4 part of n-caprylic alcohol and 0.5-1.5 parts of red ferric oxide powder. The lost foam coating provided by the invention has an excellent stripping effect and superior permeability, i.e., phenomena of air pores and slag inclusion can be effectively prevented, the quality of a casting is improved, subsequent treatment is simple, and a large amount of labor is saved.

The invention discloses a crystallization treatment device based on industrial wastewater discharge reduction. The crystallization treatment device based on industrial wastewater discharge reduction structurally comprises a motor, a steam adapter, process adapters, a barrel cover, a barrel body, a coil, an elutriation column, a water outlet, a standing valve, chemical inlets, a man hole, lifting lugs, a wastewater inlet, a drainage tube, a stirrer, a liquid level signal conversion module, a programmable controller, an upper computer and a driver. Under automatic control of the programmable controller, a liquid level signal from a vortex flow sensor is received, and logic judgment, computation and information processing are performed on liquid level data, so that the working efficiency of the stirrer in a crystallization chamber is controlled through the upper computer, the conditions that a too large stirring force causes slow crystallization and a too small stirring force causes slag inclusion in a crystallized material are prevented, the crystallization quality and the recycling utilization rate are improved, relatively low industrial wastewater discharge and a good environment-friendly effect are achieved, the automation level of the crystallization treatment device is improved, and the labor intensity of an on-site operator is greatly reduced.

The invention discloses a material taking device of a high temperature reaction furnace. Main furnace heating equipment is arranged on the outer edge of a furnace body, wherein a flow guide channel is arranged at the lower part of the furnace body; a pouring nozzle is arranged at the outer end of the flow guide channel; the flow guide channel is arranged in a flow guide seat connected with the furnace body; and a thermal switch system for controlling the temperature of the flow guide seat is arranged at the outer part of the flow guide seat. Reactive substances in the flow guide channel are solidified or melted through temperature control changes conducted by the thermal switch system, so that the flow guide channel is closed or connected, normal reaction operation of the reaction furnace is realized and reactants can be taken out. The reactive substances are only contacted with the external environment at a distance from the pouring nozzle to a die or a container, so that oxidation reaction of the reactive substances is controlled; as the flow is guided below a liquid level, the phenomenon of slag inclusion can be completely avoided from occurring to floating reactants, so that fresh gas cannot be wrapped into the floating reactants to form more air holes and air bubbles; and the flow guide channel can be rapidly opened and closed under the temperature control, so that the metering of pouring can be well controlled and the aim of accurate pouring is achieved.

The invention provides a welding technology of a high-purity ferrite stainless steel heat exchanger. The technology comprises two steps including overlaying welding of a tube plate and welding of thetube plate and a heat exchange tube, wherein the tube plate comprises a tube plate basic layer and a tube plate multiple layer; the tube plate basic layer is 64 mm thick and made of 16MnIII; the tubeplate multiple layer is S11972 with the thickness of 4 mm; a processing amount of 10 mm is preserved at an outer circular diameter is roughly lathed on a whole forge piece; a seal face is lathed on the tube plate multiple layer to a to-be-overlaid surface, and a baffle groove is dug to the to-be-overlaid surface; then, overlaying welding of nickel base alloy ENiCrMo-3 is conducted on the to-be-overlaid surface, and the heat exchange tube is made of an S11972 material; and during welding of the tube plate and the heat exchange tube, a welding joint is connected through strength welding and pasting expansion, welding is conducted on two layers, self-fluxing is conducted for the first time, and welding wires are added on the second layer. The welding technology provided by the invention has the beneficial effects that the feasible welding technology of the high-purity ferrite stainless steel heat exchanger is formulated, and layering welding of the tube plate, and welding of the tube plate and the heat exchange tube are successfully carried out, so that defects such as hot cracks, inter-granular corrosion and multilayer damage during welding are solved, and product quality is good after welding.

The invention provides a welding method for the molded surface of an invar alloy composite material forming mold. The method comprises the following steps: selecting binary mixed protective gas, wherein the binary mixed protective gas comprises argon gas and helium gas; determining the target gas pressure of the binary mixed protective gas; determining a welding groove angle of the molded surface of the invar alloy composite material forming mold as a target angle; determining a target welding voltage and a target welding current; and based on the target air pressure, the target welding voltage and the target welding current, welding the molded surface of the invar alloy composite material forming mold. According to the method, the welding efficiency of the molded surface of the invar composite material forming mold is improved, the manufacturing period of the molded surface is greatly shortened, and the phenomena of air leakage and slag inclusion of the molded surface are prevented.

The invention relates to an efficient welding method for one side welding both-side formation. The details of the efficient welding method are as follows: workpiece blanking is carried out; a workpiece after blanking is polished and assembled to form a workpiece to be welded; a digital pulse electric arc welder selects a pulse electric arc mode and completes root pass welding of the workpiece to be welded; then, the digital pulse electric arc welder selects a spray electric arc mode and completes hot weld layer root pass welding of the workpiece to be welded; after hot weld layer root pass welding is completed, the digital pulse electric arc welder selects the spray electric arc mode and completes filling root pass welding of the workpiece to be welded; after filling root pass welding is completed, the digital pulse electric arc welder selects the spray electric arc mode and completes capping root pass welding of the workpiece to be welded; and after welding is over, a power supply isturned off. The efficient welding method can realize one side welding both-side formation, has the advantages of high cladding efficiency and good operability, and solves the technical problems that one side welding both-side formation of traditional TKY welding joints is not high in welding quality, low in operation efficiency and incapable of realizing continuous operation.