50results about How to "Solve the shrinkage cavity" patented technology

The invention relates to the field of steel forging, in particular to a method for forging a superhigh-temperature soft core of a die cast steel ingot. The method comprises the steps that first, the poured steel ingot with a liquid core is subjected to superhigh-temperature die stripping; second, the poured steel ingot with the liquid core is placed in a thermos van for temperature equilibrium and then is conveyed to a forging press, the steel ingot with the liquid core is subjected to high-temperature pressure maintaining forging, solidified tail end branch crystals are fully broken, a large quantity of equiaxed crystal structures are formed, shrinkage cavities and porosity are eliminated, and dendritic segregation is lightened; and at last, general forging is conducted, and crystalline grains and structures are fully refined. The method breaks through the conventional method that the die cast steel ingot is forged after being completely solidified; a semi-solid structure with excellent liquidity on the core part of the steel ingot and the huge temperature difference between the surface and the core part are created through superhigh-temperature die stripping of the steel ingot with the liquid core; combined with a subsequent heavy pressure and pressure maintaining method, forced feeding and pressure solidification can be achieved; the problems of shrinkage cavities, porosity, segregation and the like of the center of the steel ingot are solved, and the metallurgical quality is improved; the riser weight is lowered, the heating number of forging is decreased, and the service life of a die is prolonged.

The invention discloses a die-casting process for anti-shrinkage cavity die-casting parts. The die-casting method comprises the following steps: starting the die-casting machine → installing the mold → debugging the mold → cleaning the preheated mold → spraying paint → closing the movable mold and the fixed mold → pouring →holding pressure→feeding and compaction→pressurization→separation of movable mold and fixed mold→push out the die casting→cut off the riser and gate on the die casting→saturate the die casting→surface the die casting. The die-casting process of this kind of anti-shrinkage cavity die-casting effectively solves the problems of product shrinkage and porosity, and finally obtains dense and intact parts, reducing the defective rate.

The invention discloses a large-duty loader hydraulic valve body casting mold. The large-duty loader hydraulic valve body casting mold comprises an upper shell mold body, a lower shell mold body, a sand core and a pouring and riser system. The sand core comprises a core head, a main core body and small core bodies. The main core body is composed of seven longitudinal arbors and four transverse arbors, and the longitudinal arbors and the transverse arbors are horizontally arranged in the same plane. The main core is provided with a plurality of convex blocks. Installation grooves are formed in the convex blocks. The small core bodies are fixed to the main core body through the installation grooves. The pouring and riser system comprises two exothermic and insulating risers with the diameter being 90 mm and the height being 120 mm. The large-duty loader hydraulic valve body casting mold has the advantages of being reasonable and compact in structure, high in reliability and convenient to assemble and cast, the straightness of a blank casted through a main valve hole is controlled to be smaller than 0.8 mm, assembly errors of a complex sand core are avoided, the casting defects of shrinkage cavities, shrinkage porosity, internal pores and the like of a casting piece are overcome, and the compactness of the internal structure is improved, so that leakage is avoided under a high-pressure working condition with the rated pressure being larger than or equal to 35 Mpa; and the casting qualified rate is improved greatly, and the casting cost is reduced.

The invention discloses a permeable epoxy polyester mixed powder coating, belonging to the field of powder coating technique of static coating. According to the weight percentage of the compounding, the coating consists of 25-18 percent of epoxy resin, 25-42 percent of indoor polyester resin, 0.8-5 percent of leveling agent, 1-20 percent of pigment, degasifying agent, and the rest of filling materials and other normal auxiliary agents; the preparation method is carried out by the production process of the existing powder coating. The coating is characterized in that the degassifying agent is one of polyethylene wax APP230F, 230VF, 230XF, 620F, 620VF and 620XF and occupies the weight percentage of 0.1-0.8 percent compared with the total weight. The permeable epoxy powder coating has the advantages of outstanding degassifying effect, being widely used for the powder coating disposal of devices such as castings, flat and smooth surface of the coating, good construction performance and excellent internal quality.

The invention discloses a cavity-shrinkage-prevention die-casting mold of an aluminum alloy component. The die-casting mold comprises a fixed mold body and a movable mold body, wherein the fixed mold body and the movable mold body are oppositely arranged; a cavity corresponding to the aluminum alloy component is formed at the combining position of the fixed mold body and the movable mold body; an extrusion hole communicated with the cavity is formed in the movable mold body, and an extrusion pin is arranged in the extrusion hole; and a pressing chamber connected with the cavity is arranged on the fixed mold body, and a punch for die casting is arranged in the pressing chamber. By means of the manner, according to the cavity-shrinkage-prevention die-casting mold of the aluminum alloy component, on the basis of the principle of shrinkage cavity and shrinkage porosity generation, the extrusion pin is arranged at the position, located at the position with the large product wall thickness, of the movable mold body, and in the die-casting molding process, the aluminum alloy is solidified into the semi-solid state from the liquid state; and the extrusion pin carries out extrusion towards the product wall-thickness position, the feeding and compaction effect is achieved, the problems of product cavity shrinkage and shrinkage porosity are effectively solved, and the product quality is improved.

The invention relates to a silicone adhesive composition. The silicone adhesive composition comprises, by mass, 100 parts of a low-viscosity silicone adhesive, 0.1 to 1 part of polydimethylsiloxane, 0.2 to 2 parts of a platinum catalyst, 0.05 to 0.5 part of polyether modified polydimethylsiloxane and 50 to 100 parts of an organic solvent. The invention also relates to an optical double-sided tape employing the silicone adhesive composition and used for a toughened glass protection film, and a preparation method thereof. Compared with the prior art, the optical double-sided tape provided by the invention can effectively overcome difficulty is bubble elimination during applying, enables an applied surface not to generate water ripple bubbles and snowflake bubbles and greatly improves the integral appearance and usage effect of the toughened glass protection film.

The invention discloses a metal type covered shell casting mold comprising a metal type body. At leas tone layer of resin sand shell is arranged in the metal type body; the outer surface of the resin sand shell is attached to the inner surface of the metal type body; and an inner pouring cavity anastomotic with a casting piece in shape is arranged in the resin sand shell. The metal type shell casting mold not only is applicable to the pouring of low-temperature alloy, but also can be improved to be applicable to the pouring of a high-temperature alloy material by adopting the resin sand shell, and realizes the continuous production of multiple molds, thereby improving the production efficiency, and solving the problem of not being applicable to thin castings with large areas due to the quickly fast radiating of metal.

Disclosed is a high silicon ball iron injection molding machine template casting preparing method. The method comprises the steps that raw materials comprises, by weight, 40-50% of pig iron, 20-30% of scrap steel, 20-30% of foundry returns, 1-1.4% of silicon iron and 0.004-0.005% of Sb, and are configured; melting is conducted, sampling analysis and blending composition are conducted; firstly, a rare earth magnesium nodularizer and Sb are correspondingly placed on the two sides of a bottom transverse blocking of a nodulizing bag, scrap steel sheets covers the surface of the rare earth magnesium nodularizer, and molten iron is poured into the nodulizing bag with Sb on one side, after the nodulizing reaction begins, a ladle-to-ladle inoculant is added into the nodulizing bag for inoculation, meanwhile, the molten iron is stirred, and melting of the ladle-to-ladle inoculant is promoted; and slag removal and pouring are conducted. The high silicon ball iron injection molding machine template casting preparing method has the advantages that the defects such as shrinkage and shrinkage cavity of a casting can be effectively solved, and the brittleness of the casting can be reduced, thus the scrap rate of during high silicon ball iron injection molding machine template casting manufacturing can be greatly reduced.

The invention discloses a special sand proportion for casting, comprising the following substances by weight percent: 20-30% of graphite sand, 20-30% of chromite sand, 10-20% of iron pink, 1-3% of coke powder, 0.5-2% of furan resin and the balance of silica sand. The proportion disclosed by the invention is low in cost, and good in fire-resistant and chilling effects, and can be applied to facing sand or a hot spot of nodular iron casting and steel casting; the burnt-on sand on the surface of the casting is solved; the shrinkage cavity and shrinkage porosity can be over 90%; and the surface smoothness and the yield of the casting are improved.

The invention discloses a high-frequency micro vibration negative pressure pouring technology. The high-frequency micro vibration negative pressure pouring technology comprises the steps of during pouring, pouring melt water into a sand box, then, starting a high-frequency vibration motor at negative pressure, increasing compactness in the sand box, enabling the high-frequency vibration motor, the sand box and foam to form an integral body, and regulating vibration frequency and time. The high-frequency micro vibration negative pressure pouring technology comprises the specific steps of A1, treating air in the sand box through a vacuum extraction system, and applying negative pressure to the sand box through vacuum purified flue gas; A2, starting the high-frequency vibration motor, and guaranteeing that vibration amplitude of the high-frequency vibration motor is 5000 r/min to 5500 r/min; and A3, while air in the sand box is extracted through the vacuum extraction system, starting the high-frequency vibration motor again to continuously vibrate till a casting is primarily solidified. According to the high-frequency micro vibration negative pressure pouring technology, high-frequency vibration negative pressure pouring during the pouring process is achieved, heavy section problems of a nodular iron casting or shrinkage cavity and shrinkage porosity problems of hot spot parts are solved, working efficiency is effectively improved, and unnecessary waste of resources during the pouring process is avoided.

A technology for casting the ultra-large (more than 100 tons) bearing steel roller with composite material features that a computer simulation method is used to design a metallic mould, such techniques as covering sand on iron mould and the insulating riser head are used for sequential solidifying, the different molten steels with different components are used for casting multiple times, top pouring and bottom pouring are combined, and the key parameters are controlled.

A die-casting die for motor casings comprises a moving die set (1), a fixed die set (2), a forming part, and a core pulling mechanism, and is characterized in that the forming part is mounted on the moving die set (1) and the fixed die set (2). A die guide mechanism is arranged on the moving die set (1) and the fixed die set (2). Five side cores are mounted on five side sliders respectively. Each side slider matches with a corresponding T-shaped guide slide (10) on a moving die (3) and capable of sliding in the slide. The core pulling mechanism pulls out the cores through an angle guide pin. A wedge (13) assists in locking or loosening the core pulling mechanism. Finished products made by the die-casting die are high in size precision, stable in quality, excellent in appearance quality and high in process yield. In addition, the die-casting die is low in cost and convenient to mechanically operate and automatically control.

The invention provides a casting method for preventing shrinkage porosity at a thick large wall of a casting. The casting method comprises the steps that an evaporative pattern casting technology is adopted, a vacuum negative pressure molding method is adopted in the molding procedure, before an evaporative pattern is subjected to vacuum negative pressure molding, a chiller made from a light chillmaterial is placed in a corresponding position of the evaporative pattern according to the requirement of the casting technology, and the chiller and the evaporative pattern are bonded together. According to the casting method, the problems that the chiller utilized in a conventional molding method cannot be fixed and is liable to move during the molding compaction process, feeding cannot be carried out on the thick large wall of the casting, the chiller utilized in the conventional molding method is relatively heavy, and the pattern is liable to damage and deform are solved, the casting method for preventing shrinkage porosity at the thick large wall of the casting is provided, technological methods of adopting the light chill material and assembling the chiller in advance are adopted, and porosity and shrinkage cavity problems of the thick wall during the casting process are effectively solved.

The invention discloses a vacuum self-consumption smelting process for master alloy ingot for powder metallurgy. The method comprises the following steps of 1, starting a current preheating electrodeafter arc starting, then slowly increasing the current to gradually form a molten pool, that is, after preheating for 1-5 min of less than 0.8 kA current and 22.0-22.8 V voltage, gradually increasingthe current to 1.8-2.8 kA, increasing the voltage to 23.2g-24.0 V, keeping the temperature for 2-3 min, and gradually forming a stable molten pool; 2, after the molten pool is formed in step 1, slowlysmelting the electrode with a process that maintains a current of 1.8 to 2.8 kA and a voltage of 23.2 to 24.0 V; and 3, reducing the current to 0.6-1.2 kA in 1-4 min, reducing the voltage to 22.2-22.8 V, the fusion speed is rapidly reduced, then keeping the current for 5-8 min under the condition that the current is 0.4-0.6 kA, and the voltage is 18.8-22.2V, so that the depth of the molten pool is slowly reduced. According to the process, the problem of hole shrinkage in the vacuum induction casting ingot can be improved, the component uniformity of the cast ingot is improved, the content ofimpurity elements is reduced, and the higher-quality master alloy ingot is obtained.

The invention discloses a preparation method of a nickel-chromium-aluminum-yttrium-silicon alloy target material. The preparation method comprises the following steps that nickel and chromium are mixed and placed in a crucible in a first vacuum smelting furnace together to be smelted, and nickel-chromium intermediate alloy molten liquid is obtained; aluminum and yttrium are mixed and placed in a crucible in a second vacuum smelting furnace together to be smelted, and aluminum-yttrium intermediate alloy molten liquid is obtained; the nickel-chromium intermediate alloy melt, the aluminum-yttriumintermediate alloy melt and silicon are mixed and placed in a crucible in a third vacuum smelting furnace together to be smelted, and a nickel-chromium-aluminum-yttrium-silicon alloy melt is obtained; placing the nickel-chromium-aluminum-yttrium-silicon alloy molten liquid in a graphite mold for centrifugal casting to obtain a nickel-chromium-aluminum-yttrium-silicon alloy target ingot; and sequentially annealing, deoxidizing and machining the nickel-chromium-aluminum-yttrium-silicon alloy target ingot to obtain the nickel-chromium-aluminum-yttrium-silicon alloy target. According to the preparation method of the nickel-chromium-aluminum-yttrium-silicon alloy target material, centrifugal casting is adopted, and the technical problems that in the prior art, a large number of shrinkage cavities, looseness and other defects exist in the process of preparing alloy through gravity casting can be effectively solved.

The invention discloses a gating system for a U-shaped screw pressurization diffuser casting. The gating system comprises an edge gating riser, a direct gating riser, a main runner and a pouring cup, wherein the bottoms of the edge gating riser and the direct gating riser are connected with a diffuser wax part; the top surfaces of the edge gating riser and the direct gating riser are flush to each other; the tops of the edge gating riser and the direct gating riser are respectively connected with the bottom surface of a rectangular main runner which is kept flat; and the top surface of the main runner is connected with the pouring cup. According to the gating system, the casting defects such as sinkholes, burnt-on sand and metal spikes are prevented; the product yield is increased; the production cost is reduced; the gating system is suitable for impellers of a plurality of complicated three-dimensional spiral surrounding wheels which are complicated in internal structure and shape, large in wall margin, high in demands on manufacturing accuracy, especially, liquid high-pressure conveying equipment spare parts with relatively large wall margins of closed water conservancy and chemical engineering.

The invention discloses a high-temperature alloy mould and a casting and demoulding method of the high-temperature alloy mould. The high-temperature alloy mould comprises an ultrasonic controller, wires, a base and a plurality of mould components, wherein each mould component comprises a mould, an upper mould and a lower mould; a bottom fixed seat and an ultrasonic probe are arranged in the mould, the mould is vertically fixed on the upper surface of the base, the ultrasonic probe is connected with the ultrasonic controller through the wire, and fastened on the upper surface of the base, the bottom fixed seat is further fastened on the upper surface of the base and the ultrasonic probe is wrapped inside the bottom fixed seat, and a hole of which the surface area is smaller than that of the ultrasonic probe is opened at the upper part of the ultrasonic probe, the lower mould is vertically inserted into the internal part of the bottom fixed seat through the hole, and the upper mould is arranged above the lower mould and connected with the lower mould through a clamping buckle. According to the invention, the existing process is improved by adopting an ultrasonic assisted high-temperature casting and double-node mould technology, and the high-temperature alloy mould and the casting and demoulding method of the high-temperature alloy mould are low in cost, simple in process and suitable for industrial production.

The invention discloses a mineral oil defoamer. The defoamer comprises mineral oil, a carrier composed of vegetable oil and derivatives thereof, fatty acid metal soap, alkyl silicone oil, a defoamingaid, hydrophobic silica and an emulsifier. The vegetable oil and derivatives thereof and mineral oil are introduced into a system of alkyl silicone oil and silica, the average carbon atom number of the alkyl silicone oil is controlled to make the alkyl silicone oil well intermiscible with the mineral oil, and a ratio of the mineral oil to the vegetable oil and derivatives thereof is controlled between 1:6 and 4:7 to finally effectively solve the problems of cavity shrinkage, edge shrinkage and recession of a film and enhance the defoaming and foam-inhibiting properties and stability of the defoamer.

The invention discloses a casting process for producing a precoated sand shell core rotor with steel shots as a filling material, and relates to the technical field of casting. The casting process comprises the following steps that firstly, a shell core and a built-in core are manufactured through precoated sand, the shell core is combined into a precoated sand shell, and the built-in core is placed in the precoated sand shell; secondly, the precoated sand shell is placed in a container, the container is filled with the steel shots, thus, the precoated sand shell is wrapped with the steel shots, and finally the steel shots are compacted through vibration; thirdly, a pouring cup and a riser are arranged at the top of the precoated sand shell; fourthly: molten iron of nodular cast iron is injected into the precoated sand shell smoothly through the pouring cup, and casting molding is conducted; and fifthly, after the molten iron is completely cured, the casting rotor is obtained. The functions of rapid heat absorption and heat transfer chilling of the steel shots are used for increasing the cooling speed of the molten iron, the cooling speed of the cast iron eutectic stage is changed,an as-cast microstructure of the cast iron can be changed in a large range, and thus casting structure is dense.

The invention discloses a DISA vertical green molding sand molding line air cylinder mold and a casting process thereof. The mold comprises a forward pressing plate, a reverse pressing plate, anti-collision columns and positioning pin bushes, wherein the forward pressing plate and the reverse pressing plate are both provided with pouring gate cups, the tail end of a horizontal runner is provided with a horizontal runner riser, the forward pressing plate and the reverse pressing plate are both provided with a plurality of feeding risers, the lower portions of the feeding risers are provided with vertical pouring gates, the two sides of the vertical pouring gates of the forward pressing plate and the reverse pressing plate are both provided with mold core mold cavities, the two ends of the vertical pouring gates of the forward pressing plate are provided with pouring gates, the pouring gates communicate with the mold core mold cavities of the forward pressing plate horizontally, the topsof the mold core mold cavities of the forward pressing plate are provided with air exhaust pieces, and the air exhaust pieces communicate with air exhaust passages. The casting process comprises themolding working procedure, the smelting working procedure, the nucleating working procedure, the pouring working procedure, the shakeout working procedure, mechanical property detection, primary shotblasting, external cooperation polishing, secondary shot blasting, inspecting packing and warehousing. By means of the DISA vertical green molding sand molding line air cylinder mold and the casting process thereof, the problems of casting shrinkage cavities and shrinkage porosity, weight reducing hole fleshiness and sand sticking and the like are solved, the casting finished product rate and theprocess production rate are greatly increased, and the mass production requirements are met.

The invention discloses a method for gravity casting of aluminum liquid through segmented mold filling and a casting system. The casting system is characterized in that a mode cavity is divided into several segments along the length direction of the product, an independent ingate is arranged at the tail end of each segment; and a rinserbob is arranged at the intersecting position of each ingate and a main runner. The aluminum liquid is casted from a cast gate, is accumulated at the segment of the lowest end of the main runner, then introduced in the mode cavity in order through the ingate from down to up, and fed at the aluminum liquid inlet; until the aluminum liquid is completely filled in the rinserbob at the top of the mode cavity. The casting system effectively solves the mold filling problems of large shape, complex structure, thin wall thickness, long length of the pipe product due to a single cast gate in prior art, stable mold filling of aluminum liquid can be ensured, progressive solidification can be realized, so that generation probability of hole shrinkage and air hole can be greatly reduced. According to the invention, casting quality is effectively increased, production cost is reduced, equipment structure is simple, operation is convenient, and the industrial popularization and application are easy to realize.

The invention belongs to the technical field of wetting agents and in particular relates to a method for producing a wetting agent. The method comprises the following steps: reacting methyl isobutyl ketone to obtain 2,6,8-trimethyl-6-hydroxy-4 nonanone, reacting the 2,6,8-trimethyl-6-hydroxy-4 nonanone to obtain 2,4,8-trimethyl-4-nonyl alcohol, and reacting the 2,4,8-trimethyl-4-nonyl alcohol to obtain a highly branched-chain nonyl alcohol derivative. The method has the beneficial effects that the wetting agent has extremely low static and dynamic surface tension, and fluidity and leveling property are promoted; the product is low-foaming and can be applied to a foam inhibition wetting agent in a waterborne system; the wetting agent is silicon-free, oil-free and non-toxic; the conversion rate of the process is high.

The invention relates to a cooling water tank for rapidly solidifying a high-purity aluminum-silicon alloy. The cooling water tank comprises a water tank main body with an open surface, and is characterized in that a plurality of alloy ingot blank placing grooves are arranged on the side wall of the open end of the water tank main body in parallel, a water outlet structure and a water inlet structure are respectively arranged in the water tank main body, and a water inlet of a water outlet branch pipe is lower than the lowest surface of the alloy ingot blank placing grooves. According to the cooling water tank, the structure is simple, the manufacturing cost is low, the water inlet structure and the water outlet structure with water spraying ports are arranged, and the alloy ingot blank placing grooves are arranged on the water tank main body, and matched with a drainage pipe, so that uniform cooling of alloy ingot blanks is enhanced, the rapid cooling effect is achieved, the cooling effect is improved, the pouring efficiency of the high-purity aluminum-silicon alloy is improved, meanwhile, the problem that shrinkage holes and needle holes appear during pouring of the high-purity aluminum-silicon alloy is solved, plasticity of the material is improved, the tensile strength and the elongation rate of the alloy are also improved, and the use requirement is met.

The invention discloses a hot pressing former oil cylinder and a preparation method thereof, and belongs to the technical field of hot pressing former oil cylinder preparation. A bottom pouring systemis used for pouring; cold iron is arranged on the inner hole surface of a hot pressing former oil cylinder and on the bottom surface of a flat plate; under a synergistic effect of various process parameters, such casting defects as casting working surface air holes, hole shrinkage, looseness, cracks and slag and sand inclusion in the hot pressing former oil cylinder are effectively solved, the comprehensive mechanical capacity and the yield of hot pressing former oil cylinder castings are improved, and the production cost is reduced; and meanwhile, on selection of modeling sand, scrubbing rawsand with an SiO2 content of higher than 90% and a particle size of 50-100 meshes is adopted as the modeling sand, and furan resins are used as adhesives, so that the pollution emission in the casting production process is reduced.

The invention relates to a center housing product mold. The center housing product mold comprise a front press plate and a reverse press plate, wherein two casting mold core groups are respectively arranged on the front press plate and the reverse press plate; each casting mold core group comprises two symmetric casting mold cores; the upper part of the large flat surface of each casting mold coreis provided with a riser which is communicated with the corresponding casting mold core, and the lower part of the large flat surface of each casting mold core is provided with an inner gate which iscommunicated with the corresponding casting mold core; a vertical runner I and a vertical runner III are arranged on the reverse press plate, a vertical runner II is arranged on the front press plate, and the upper edge of the vertical runner I is connected with a gate cup; when the front press plate and the reverse press plate are shaped and combined, the vertical runner I is communicated with the vertical runner II, the vertical runner II is communicated with the vertical runner III, the vertical runner III is reversely pressed with a transverse runner, and the inner gate is reversely pressed with the transverse runner; an air exhaust sheet is arranged on the front press plate, and the air exhaust sheet is arranged near the casting mold core groups on the front press plate without connection.