75results about How to "Improve ingot quality" patented technology

The invention provides equipment and a method for casting a plurality of aluminum alloy ingots with small diameters by using vertical direct chilling casting (DC) and relates to the equipment and the method for casting the aluminum alloy ingots, which aim to solve the problems of low consistency of metal temperatures, low water cooling uniformity and high possibility of ingot suspension or tension fracture and flow running in each crystallizer in the process of casting the aluminum alloy ingots with the small diameters by the conventional technology for casting the plurality of aluminum alloy ingots with the small diameters by using the vertical DC. The method comprises the following steps of: communicating all branch outlets on runners with a plurality of upper end inlets of hot top caps correspondingly one by one; communicating the lower end outlet of each hot top cap with a crystallizer inlet of the crystallizer, wherein the distances between a flow storage slot and the runners of all crystallizers are same; heating a heat preserving sleeve to the temperature of between 100 and 150 DEG C; opening the outlet of a smelting furnace, feeding molten aluminum alloy into all the crystallizers through the runners, and performing water cooling; stopping for 5 to 10 seconds after the liquid level of the molten aluminum alloy in the runners reaches a preset position; and moving an ingot guiding device downwards. The surface of each ingot is smooth, does not have cracks and has small segregation tumors, and each ingot does not have air pores, is not loose and has small grains.

The invention discloses a manufacturing device of an ultra-large type special thick plate rectangular ingotblank. The manufacturing device of the ingotblank comprises a water-cooling metal mould chassis on which a water-cooling metal mould is arranged; the top of the water-cooling metal mould is provided with a heat insulation and heat preservation dead head; the interior of the water-cooling metal mould is a taperless rectangular hollow cavity which is through up and down; and the hollow cavity of the water-cooling metal mould is internally through and is provided with a width delivery device. By adopting a taperless water-cooling metal mould structure based on a traditional roller manufacturing technology, the invention can eliminate the taper of a casting, lower the higher requirement for the opening degree of a rolling mill, reduce the impact of the taper to the rolling of the rolling mill at the initial stage and ensure that the produced ingotblank more approaches to a finished plate in shape. The manufacturing device is provided with the width delivery device by combining the characteristics of the ultra-large type rectangular ingotblank, thereby ensuring that the filling of liquid steel and the formed temperature field are more uniform, avoiding the occurrence of cracks and trapped gas conditions, being beneficial to the upward flotation of impurities, and improving the quality of the ingotblank. The width delivery device has simple structure and convenient use.

The invention discloses a small-size LED copper strip production process, and belongs to the technical field of the copper strip production process. The production process includes the following stepsof (1) smelting and ingot casting, (2) hot rolling, (3) milling, (4) rough rolling, (5) first annealing, (6) one-step cleaning, (7) intermediate rolling, (8) secondary annealing, (9) secondary cleaning, (10) intermediate finish rolling, (11) third annealing, (12) third cleaning, (13) finish rolling, (14) unwinding, (15) fourth annealing, (16) fourth cleaning, (17) refine rolling, (18) fifth cleaning, (19) flattening and (20) cutting and delivery. According to the technical scheme, the quality of small-size LED copper strips can be improved, the workshop cost is reduced, and the production profits are increased.

The invention provides a rare earth magnesium alloy. The rare earth magnesium alloy is characterized by comprising the following components by mass percent: 0.5 to 4.0% of Zn, 0.1 to 2% of Gd, 0.3 to 0.9% of Zr, and the balance of Mg. The preparation method of the rare earth magnesium alloy sheet comprises the following steps of: treating a rare earth magnesium alloy ingot casting by uniform annealing; cooling with water; milling the surface; preheating a milled blank; rolling for four to eight times; melting down and heating once every two to three times after rolling; continuously rolling, wherein the total rolling reduction is 70 to 95%; annealing the sheet subjected to hot rolling; performing cold rolling for a moderate-thickness sheet subjected to hot rolling for two to four times; and then annealing the sheet subjected to cold rolling to obtain the rare earth magnesium alloy sheet. The invention also provides a preparation method of the rare earth magnesium alloy and the sheet thereof. The rare earth magnesium alloy sheet is high in plasticity and high in heat stability. Compared with hot rolling, cold rolling has the advantage that the magnesium alloy can be prevented from being oxidized into a film during heating; in addition, the prepared sheet is accurate in dimension and uniform in thickness; a thin belt which cannot be produced by hot rolling can be obtained; and mass production and application can be realized.

The invention provides an ingot mold dead head thermal insulation device. The ingot mold dead head thermal insulation device aims to restrain heat transmission of the lateral wall of a dead head to reduce lateral heat dissipation of the ingot mold dead head, achieve sequential solidification and improve the steel ingot yield and the ingot casting quality. The thermal insulation device comprises a heavy thermal insulation material layer, hollow air chambers, partition plates, a light thermal insulation material layer and reinforcing ribs. The ingot mold dead head thermal insulation device can obviously reduce the capacity of heat transmission and obviously improve the thermal insulation performance of the thermal insulation dead head. Compared with solid thermal insulation materials, the ingot mold dead head thermal insulation device can reduce the capacity of heat transmission of the lateral wall by more than 50% and achieve the purposes of improving liquid supplement effect of the dead head, reducing the ratio of the volume of the dead head and the volume of the ingot mold and improving ingot mold casting quality.

The invention discloses a double strong copper strip production technology for an automobile connector, and belongs to the technical field of a copper strip production technology. The double strong copper strip production technology comprises the following steps of (1), smelting and ingot casting; (2), hot rolling; (3), milling; (4), rough rolling; (5), once annealing; (6), once cleaning; (7), medium rolling; (8),twice annealing and cleaning; (9), finish rolling; (10), three times annealing and cleaning; (11), finish rolling; (12), four times cleaning; (13), leveling; and (14), examining and delivering; and specified thickness of strip coil after rough rolling is 2.5 mm. According to the technical scheme, brass products can meet the double requirements of tensile strength and elongation index of automobile connector industry.

The invention provides a wire feeding speed regulation and control system comprising a speed monitoring device, a PLC controller, a PC machine, a frequency converter and an alarm device, wherein the speed monitoring device is used for detecting wire feeding speed in real time, the PLC controller is used for determining whether difference between actual conveying speed obtained via the speed monitoring device and object wire feeding speed is in a permissible error range, the PLC controller then sends frequency control signals to the frequency converter, the frequency converter controls a driving motor to adjust speed, and the PLC controller sends alarms signals to the alarm device. The PC machine is connected with the PLC controller so as to record speed and technological parameters. The invention also provides a wire feeding speed regulation and control circuit which is connected with each electric appliance element, and therefore an alarming function, a monitoring function and a wire feeding speed control function of the above system can be fulfilled. The wire feeding speed regulation and control circuit and system disclosed in the invention provides the alarming function, the monitoring function and the wire feeding speed control function; rates of faults occurring during wire feeding processes can be finally lowered, and ingot casting quality can be improved.

The invention discloses a preparation method for reducing zirconium compound segregation of a zirconium-containing magnesium alloy cast ingot ZK61M, and relates to a preparation method for the zirconium-containing magnesium alloy cast ingot. In order to solve the problem that a great deal of Zr compound segregation is generated in a casting process of a current zirconium-containing magnesium alloy cast ZK61M, the preparation method comprises the following steps: I, weighing materials; II, adding materials and smelting by utilizing an stirring-up device; III, carrying out argon-gas refining; IV, stirring and refining; V, spraying powder and refining; and VI, casting. The preparation method can be used for obtaining the zirconium-containing magnesium alloy cast ZK61M with low compound segregation; diameter of the prepared zirconium-containing magnesium alloy cast ZK61M is 92mm-485mm, appearance is complete, obvious defects are avoided, content of melt impurities is low, and Zr compound segregation of the magnesium alloy cast ingot can be effectively reduced. The preparation method is suitable for preparing the zirconium-containing magnesium alloy cast ingot ZK61M.

Provided is an ingot growing apparatus. The ingot growing apparatus for growing an ingot from a silicon melt received in a crucible by using a seed includes a chamber providing a space in which a series of processes for growing the ingot is performed, the crucible disposed within the chamber, a heating unit disposed outside the crucible, a seed chuck fixing the seed, an elevation unit connected to the seed chuck; and an upper heat shielding body disposed above the crucible, the upper heat shielding body having a hole through which the grown ingot passes, wherein the hole is adjustable in size.

A method for preparing a seed crystal including a protective film includes preparing i) a first layer composition of a first binder resin and a first solvent and ii) a second layer composition of a second binder resin, a filler, and a second solvent, applying the first layer composition to the rear surface of a seed crystal to form a first coating layer on the rear surface of the seed crystal and drying the first coating layer to form a first layer on the rear surface of the seed crystal, and applying the second layer composition onto the first layer to form a second coating layer on the first layer, followed by heat treating to form a second layer on the first layer wherein the first layer and the second layer are sequentially disposed on the rear surface of the seed crystal, and wherein the first layer has a thickness corresponding to 30% or less of the distance from the bottom surface of the first layer to the top surface of the second layer.

The invention discloses an aluminum alloy melt purifying device. The aluminum alloy melt purifying device comprises a holding furnace and an SNIF online degassing device. The SNIF online degassing device comprises a first rotor and a second rotor which is arranged in parallel to the first rotor; the rotating speed of the first rotor is 450-600rpm, the argon flow on the first rotor is 4.5-6.0m<3>/h, the rotating speed of the second rotor is 300-450rpm, the argon flow on the second rotor is 2.8-3.2m<3>/h. According to the aluminum alloy melt purifying device disclosed by the invention, a single-rotating rotor type metal refining device of TS degassing equipment is replaced by double rotor equipment of the SNIF online degassing device, so that the contact area and the contact time of air bubbles and melts are increased to improve the degassing and purifying effect when the melts pass through the SNIF online degassing device, and furthermore, the quality of ingots is improved.

The invention discloses a short-flow preparation method of an aluminum-containing titanium alloy. Common titanium sponge or titanium-based sponge alloy (which is prepared by metallurgy of titanium, aluminum, tin, molybdenum and the like, alloying of titanium, aluminum, tin, zirconium, molybdenum and the like and merging in one technological process) is used as a raw material, and a low-cost and high-quality titanium alloy cast ingot is obtained through one-time smelting and casting by adopting an electron beam or plasma or induction or vacuum self-consuming electric arc smelting technology. The raw material cost is low, a multi-component alloy element preparation process required by a traditional process is omitted, a repeated remelting casting (casting for 2-4 times) process of a titanium alloy ingot is omitted, the process is simplified, the flow is shortened, the casting cost is reduced, and the casting efficiency is improved. As the high-temperature and high-vacuum casting times are reduced by about 70%, the oxidation and volatilization loss of aluminum, tin, manganese and the like is greatly reduced, alloy components are easier to control, and the quality of the cast ingot is greatly improved.

The invention relates to a high-specific-modulus aluminum alloy. The alloy is prepared from, by mass, 2%-4% of Li, 1%-7% of Mn, 0.05%-0.3% of Zr, 0.0%-0.3% of Ti, 0.0%-0.3% of Sc and the balance of Al. Li and Mn are necessary elements for improving the modulus of the aluminum alloy, and Zr, Ti and Sc are grain control elements. The preparation method comprises the following steps of weighing the components according to a designed aluminum alloy component proportion, smelting in a vacuum smelting furnace, casting, molding, and carrying out thermal deformation to form a bar or a plate. The aluminum alloy with high modulus and high specific modulus is prepared by adopting a smelting casting and deformation heat treatment method and controlling the contents of alloy elements (Li and Mn) with increased modulus and the grain control elements Zr, Ti and Sc. An aluminum-manganese-lithium alloy with modulus higher than that of the existing aluminum alloy is prepared, the preparation process is simple, and the alloy can be used as a light structural material with high specific stiffness.

The invention discloses a semi-continuous casting process of a VW64M high-strength heat-resistant magnesium alloy big ingot blank. An alloy contains, by weight, 5.0-7.0% of Gd, 2.5-4.0% of Y, 0.1-0.3% of Ag, 0.15-1.0% of Zn, 0.25-0.65% of Zr, 0.002-0.050% of Ca and the balance Mg. The process mainly includes the following steps that a magnesium ingot is molten at the temperature ranging from 670 DEG C to 720 DEG C; a Mg-Ca intermediate alloy and a fluxing agent are added; alloy elements are added at the temperature of 750 DEG C to 800 DEG C; refining and slagging-off are performed; gas feeding and stirring are performed; the temperature is adjusted to reach 680 DEG C to 700 DEG C and maintained for still standing for 1.5-3.5 hours; and low-temperature low-speed electromagnetic casting is performed. By coordinating the process parameters of all the steps, the magnesium alloy ingot blank being free of cracks, smooth in surface, small in grain size, uniform in structure and free of solute segregation and having the diameter phi of 300-630 mm and the length of at least 1000 mm is obtained.

The invention provides a casting mold for a high-temperature alloy cast ingot with the large height-diameter ratio and application. The casting mold comprises a hollow casting mold unit, an opening is formed in the upper end of the casting mold unit, the casting mold unit is sleeved with a riser unit, the riser unit is sequentially provided with a casting head layer and a heat preservation layer from inside to outside, and the casting mold unit is sequentially provided with a first section, a second section and a third section from top to bottom; and the inner walls of the first section, the second section and the third section are flush in the vertical direction, and the outer wall of the second section retracts inwards relative to the first section and the third section in the horizontal direction. The invention further provides application of the casting mold for the high-temperature alloy ingot with the large height-diameter ratio. According to the casting mold for the high-temperature alloy cast ingot with the large height-diameter ratio and the application, the shrinkage porosity in the center of a casting can be remarkably reduced, the cast ingot quality and the product yield are improved, large-scale production is easy, and no adverse effect is generated on the production efficiency.

The invention relates to a method for improving a metallurgical-method polycrystalline silicon growth interface. The method comprises the steps: (1) loading polycrystalline-silicon silicon materials to a high-purity quartz crucible, placing the high-purity quartz crucible into a directional solidification furnace, and carrying out vacuumizing until the internal degree of vacuum of the furnace is lower than 10Pa; (2) heating the temperature of the furnace to 1,450 DEG C to 1,550 DEG C so as to melt the silicon materials; (3) carrying out external-field treatment on the silicon materials for 10 to 30 minutes at the magnetic intensity of 0.15T to 0.5T, then, cooling the furnace body at the rate of 5 DEG C/min to 10 DEG C/min, downwards shifting a moving part of the furnace body at the rate of 5mm/h to 10mm/h, enabling silicon melt to be divorced from a heater and start to grow crystals, and closing a magnetic field when the temperature is 1,100 DEG C to 1,200 DEG C; and (4) after crystal growth, enabling the moving part of the furnace body to rise to an initial position in a furnace chamber at the rate of 2mm/s to 4mm/s, then, heating the temperature to 1,250 DEG C to 1,350 DEG C, carrying out heat preservation for 2 to 5 hours, and then, carrying out cooling at the cooling rate lower than 4 DEG C/min. According to the method, the form of a solid-liquid interface in a silicon material growth process is regulated and controlled by adopting an external static magnetic field, so that a smooth solid-liquid interface is obtained, ideal columnar crystal grain tissue is obtained, and the quality of silicon ingots is improved; and the process is more environmentally friendly, is compatible with the existing technologies of enterprises and is applicable to large-scale production.

The invention belongs to the field of metal materials, and relates to a refining method for an aluminum-silicon cast aluminum alloy. An aluminum alloy ingot raw material comprises the following elements in percentage by mass: 10.5-11.5% of Si, 0.3-0.5% of Mn, 0.2-0.3% of Mg, 0.3-0.6% of Fe, less than or equal to 3.5% of Cu, less than or equal to 0.9% of Zn, less than or equal to 0.3% of Sn, 0.2-0.5% of Ni and the balance of Al. Dried alum is sent into molten aluminum together with an inert gas by a spray gun, wherein the alum addition rate is 1-10%kg/t in Al, the inert gas is injected into themolten aluminum through a graphite rotor, and the bubble diameter of the prepared molten aluminum is less than 1mm. An aluminum alloy ingot obtained by refining the molten aluminum by the refining method for casting an aluminum alloy material, provided by the invention, has a hydrogen content of less than 0.25cc in 100g of Al and an impurity content of less than 200ppm in 100g of Al.

The invention discloses a shunting hopper used for casting a fused mass of aluminum. The invention is characterized in that the material of insural 140 is adopted. The hopper has good resistance for long time baking at high temperature, can effectively remove crystallization water, is hard to generate cracks and is hard to drop slag, realizes the automatic control on the flow-supply flux of an aluminum liquid in a crystallizer and the liquid level in the crystallizer by self buoyancy; the flow-supply is steady during the casting process, thus being capable of reducing the slag inclusion of a cast ingot and improving the quality of the cast ingot.

The invention provides a refining agent. The refining agent is prepared from the following components: 2.5 to 3.5 weight percent of Ti, 0.8 to 1.3 weight percent of B and the balance of Al. The invention provides a refining method of a 2124 alloy casting ingot; the refining agent provided by the technical scheme is added in a process of preparing the 2124 alloy casting ingot. The refining agent with specific components is used for refining the 2124 alloy casting ingot; a 2124 alloy can be refined relatively well under the condition that the dosage of the added refining agent is relatively small; the aggregation of TiB2 particles is reduced by the refined 2124 alloy.

The invention relates to a directional solidify steel ingot side wall dual-layer hollow heat insulator. Wherein, said device has two layers of thermal insulated materials at the inner side of casting section filled with steel liquid; there is thermal insulated gas layer between said two layers; the inner layer contacts the steel liquid; the steel liquid and thermal insulated gas layer have thermal insulated heater above; the water cold basis is at the bottom. Compared with present technique, the invention has high thermal insulation effect, to reduce the thermal conduction of side wall, to support the growth of post crystal and improve the quality of casting ingot.

The invention belongs to the field of polysilicon casting, and especially relates to a polysilicon ingot furnace and a rapid ingot casting technology thereof. Lateral part air vents are evenly arranged in the annular direction in the lower part of a heat-insulation sleeve of the polysilicon ingot furnace. The rapid ingot casting technology, which adopts the polysilicon ingot furnace, comprises following steps: during the crystal growth process, the outlet is stayed open, argon is introduced into the furnace body from the inlet in the top part and lower openings of the lateral part air vents; in the phase of annealing, the outlet is stayed open, argon is introduced from the inlet in the top part, and upper openings and middle openings of the lateral part air vents, in the temperature maintaining stage, all lateral part air vents are shut; in the cooling stage, the outlet, the inlet in the top part, and all lateral part air vents are opened, and when the temperature of the finance arrives at 350 to 400 DEG C, silicon ingots are taken out. The polysilicon ingot furnace and the rapid ingot casting technology thereof has the advantages that cooling positions can be selected and cooling speed can be effectively controlled through the lateral part air vents, thus dislocation is reduced, and the production period is reduced by 15% through adopting the furnace and method thereof.