118results about How to "Increase casting speed" patented technology

The invention discloses an alloy ingot for an automotive hub and a production method thereof. The alloy ingot comprises the following components: 6.8-7.2% of Si, 0.28-033% of Mg, 0.10-0.15% of Ti, 0.015-0.030% of Sr, less than or equal to 0.10% of Fe, less than or equal to 0.05% of Mn, less than 0.01% of zinc, less than 0.01% of Cu, less than 0.003% of Ca, less than 0.002% of P, less than 0.02% of other single impurity content, less than 0.1% of total impurity content and the balance of aluminum. The production method of the alloy ingot for the automotive hub comprises the following steps of: adding 3303 industrial metallic silicon and electrolytic aluminum liquid for batching, heating at an appropriate temperature and melting, spreading a covering agent so as to reduce oxidation slagging, stirring so that the industrial metallic silicon rapidly melts, keeping uniform temperature, slagging off, keeping melt clean, spraying powder and refining by adopting high-purity N2 and a refined powder spraying agent, controlling the temperature of a smelting furnace to 740-750 DEG C, adding Al-Sr alloy to aluminium water, carrying out secondary degassing and slagging-off by adopting a powder spraying refinement method, filtering to remove slag, and casting the alloy ingot in line with requirements. The alloy ingot obtained by the method has the advantages of stable and uniform components, compact structure and clean surface; and the production method is the best production method for producing the A356.2 alloy ingot for the low-iron high-end automotive hub.

An oily electro-magnetism vertical type semi-continuous casting process for a magnesium alloy ingot blank and a crystallizer are disclosed. The crystallizer comprises a metal liner, a cooling system, an excitation winding, a splash ring and a cover gas ring. The metal liner is disposed at the center of crystallizer. A cavity cooling system is disposed out of the metal liner. The excitation winding is disposed at the lower part in the cooling water cavity. A splash ring is disposed at the upper edge of the crystallizer liner. A cover gas ring is disposed above the splash ring. The invented method comprises following steps: coating a thin layer of lubricant oil on the inner wall of the metal liner, starting the crystallizer cooling system; then starting the low frequency generation power source to supply low frequency alternating current to the excitation winding; inducing the magnesium alloy fluid into the shunting disk disposed in the center of the liner; opening the cover gas ring; starting the casting machine and adjusting the crystallizer liquid level to be stable after the magnesium alloy fluid fills the top of the dummy ingot head; enlarging the cooling water flow, opening and adjusting control valve for controlling the splash ring. The invented proves can improve the surface quality of the magnesium alloy ingot blank, reduce surface turning quantity thereof, and increase casting speed thereof.

The invention discloses a hot top casting process for a phi 784-mm 7xxx-series superhard aluminum alloy round bar. The aluminum alloy round bar is composed of, by mass, 0.25% of Si, 0.4% of Fe, 1.55-1.65% of Cu, 0.25% of Mn, 2.55-2.65% of Mg, 0.19-0.25% of Cr, 5.6-5.7% of Zn, 0.15% of Ti, 0.03% of Zr and the balance Al. The manufacturing process comprises the steps of a, material preparation; b, smelting; c, stirring; d, refining; e, slagging-off; f, heat preservation and standing; g, online thinning; h, online degassing; i, filtration; j, casting; k, homogenizing. Through the process, the defects, such as cracks, component segregation, bright grains, thick grains and loose pores, which often appear when a direct condensation casting technology is adopted for large-diameter superhard aluminum alloy are overcome, and by the adoption of hot top casting, the defects of surface segregation tumors, thick coarse-grain layers and the like are overcome.

The invention relates to the technical field of aluminum alloys, in particular to equipment for producing an aluminum alloy hollow casting ingot and a method of the equipment. The equipment for producing the aluminum alloy hollow casting ingot comprises a core die, a crystallizer, a bracket and a dummy ingot, wherein the core die is positioned at the center of the crystallizer and is concentric with the crystallizer; the bracket arranged on the crystallizer is used for supporting the core die; the dummy ingot is arranged at the lower part of the core die; a space between the core die and the crystallizer is a die cavity; the core die is designed into a taper with a large upper part and a small lower part; and the size of the taper is 1-30 degrees; a cooling system and a lubricating system are arranged in the core die; a coil is arranged in a water chamber of an aluminum sleeve of the crystallizer; and a shunt and a stop block are arranged on the crystallizer. According to the equipment for producing the aluminum alloy hollow casting ingot and the method for the equipment disclosed by the invention, a friction force between the casting ingot and the die core in the hollow casting process of the aluminum alloy is reduced and the core locking and breakout are avoided.

Disclosed is a magnesium alloy round billet continuous casting crystallizer. Water flowing grooves are distributed in the contact surface of a water tank water diversion body or a cooler along the periphery, and the water flowing grooves in the upper, middle and lower portions are connected with water inlet/outlet channels in respective areas respectively and enable the upper, middle and lower portions to supply different cooling media and flowing amounts according to needs, so that segmentation cooling control over the crystallizer is achieved. Medium inlet/outlet ports of the upper, middle and lower portions are communicated with corresponding water inlet/outlet flanges respectively, and the length of the crystallizer can be increased to 800 mm to the maximum extent. A cooling area of the inner wall of the crystallizer adopts independent cooling control with an upper section, a middle section and a lower section from top to bottom, and control flexibility of the crystallization and solidification intensity of molten magnesium alloy is improved. Inert gas is introduced to the lower portion of the crystallizer for protection, so that water steam is prevented from entering the inner wall of the crystallizer and causing combustion or explosion accidents of the molten magnesium alloy. The magnesium alloy round billet continuous casting crystallizer is an important breakthrough in improving the casting speed of the magnesium alloy, and fills the blank in the field of comprehensive design schemes of the magnesium alloy continuous casting crystallizer.

The invention discloses a casting method for a steel-copper composite cylinder body. The casting method comprises the steps of performing three-dimensional modeling, designing a casting technology and performing technology simulation and optimization, performing base steel heat treatment, performing machining, tool machining and welding, performing base steel surface treatment, performing pre-heating treatment before base steel production, smelting copper alloy, dipping the copper alloy, melting anhydrous borax, putting base steel into a borax solution, pouring the copper alloy into the base steel, putting the base steel into a water tank and cooling and solidifying the base steel to room temperature to obtain the steel-copper composite cylinder body. According to the casting method, the problems of the composite casting technology and the composite material composition of the steel-copper cylinder body can be solved; and the composite strength of the thermometal cylinder body can be high, the yield can be high, the cost can be low, the size of the cylinder body can not be limited, the forming process can be controlled easily, and the quality can be stable.

The present invention discloses a continuous cast columnar crystal square billet and its columnar crystal control method. It is characterized by that said square billet is continuously cast by using molten steel containing chemical components of screw-thread steel, carbon structure steel, alloy structure steel, spring steel, bearing steel, low-alloy high-strength steel, hard wire steel or cold-short steel. The columnar crystal rate in the central zone of said square billet is 90-100%, and its equiaxed crystal rate is 0-10%. Said invention utilizes forced cooling and thermal stress downwards compression of continuous casting process to raise uniformity of material components, reduce segregation value of material components and internal defect probability and raise columnar crystal rate of square billet, at the same time, said invention adopts forced cooling and high drawing speed so as to make continuous casting machine efficiency be raised by 10%-40%.

The invention discloses a vertical semi-solid state cast rolling device and method and relates to aluminum alloy cast rolling equipment and the technical field of manufacturing in order to solve the technical problems that an existing cast rolling method is low in production efficiency, a casting nozzle is prone to blockage, and serious macro segregation and micro segregation defects exist. The vertical semi-solid state cast rolling device comprises a platform, and a launder is arranged at the upper end of the platform; the lower end of the platform is provided with a casting nozzle which is communicated with the launder; the outlet position of the casting nozzle is horizontally and symmetrically provided with a left cast rolling roller and a right cast rolling roller; an outlet of the casting nozzle is higher than a center line of the left cast rolling roller and the right cast rolling roller; a flow dividing block is arranged in the casting nozzle in the width direction; and cooling water is introduced in a roller sleeve of the left cast rolling roller and a roller sleeve of the right cast rolling roller.

Disclosed is a casting method for reducing macroscopic segregation of a cast ingot. The method is characterized in that real casting time tp of the cast ingot is controlled to meet the following requirement: 1/10t<tp<t, wherein t is the time needed by the cast ingot to solidify completely in a common casting technique. The method includes the following concrete steps: step1, obtaining the time t needed by the cast ingot to solidify completely in the common casting technique through experimental determination or numerical simulation, step2, casting the cast ingot in a casting mould by using a casting ladle, and step3, controlling the real casting time tp to meet the requirement by adjusting casting speeds or adjusting the size, the position and the number of holes of the casting ladle till casting is finished. The method has the advantages that the casting speeds are low, solute convection is reduced, and local solidification speeds are improved; therefore, the method is beneficial to grain refinement and suppression on the macroscopic segregation, and suitable for casting various cast ingots, especially large-sized cast ingots.

A casting method for a steel-copper compound cylinder includes the steps of three dimensional modeling, casting technology design and technology simulation and optimization, steel base heat treatment, machining-tool machining and welding, steel base surface treatment, preheating treatment of the steel base before production, borax leaching, copper alloy smelting, pouring the copper alloy into the steel base, centrifugal treatment and cooling solidification to the room temperature, and obtaining the steel-copper compound cylinder. The casting method solves the difficult problems of compound casting technology and compound material elements of the steel-copper cylinder; and the compound strength of the bi-metal cylinder is high, the rate of finished products is high, the cost is low, the size of cylinders is not limited, the molding process is easy to control, and the quality is stable.

The invention provides a method for reducing longitudinal division of a weather-proof steel continuously cast slab. The control performed in a technological process is that casting is performed at a low molten steel superheat degree and a higher slab pulling rate, wherein the temperature of cooling water at an inlet of a crystallizer is improved in a casting process, and the taper of the crystallizer is increased; the alkalinity of covering slag is improved to be within a range of 1.40-1.50; the viscosity eta of the covering slag is reduced to be within the range of 0.70-0.80 at the temperature of 1,300 DEG C. According to the method for reducing the longitudinal division of the weather-proof steel continuously cast slab, the longitudinal division of the weather-proof steel continuously cast slab can be reduced to be below 0.82 percent from 2.75 percent, and considerable economic benefit can be achieved.

The invention discloses a high-speed semicontinuous casting device of an aluminum alloy cast ingot, and belongs to the technical field of aluminum alloy casting. The device comprises a hot top, a crystallizer inner sleeve, a crystallizer outer sleeve, a cooling water cavity and a dummy bar head. A secondary cooling water cut-off device is arranged below the crystallizer inner sleeve, and a grease metering valve is arranged at an inlet of each oil conveying pipe below the crystallizer outer sleeve. A method comprises the steps that aluminum alloy melt is cast for semicontinuous casting, and lubricating oil is conveyed; (2) the semicontinuous casting speed is controlled to range from 200 mm/min to 400 mm/min, secondary cooling water is sprayed to the surface of the cast ingot, and the conveying amount of the lubricating oil is increased along with the casting speed; (3) the surface temperature of the cast ingot is detected; (4) the secondary cooling water cut-off device is controlled according to the surface temperature of the cast ingot; and (5) operation of the step (4) is repeated till casting is completed. According to the device and the method, the casting speed is greatly increased, the surface quality of the cast ingot is improved, the cast ingot has no casting defect, and the microstructure is uniform.

The invention discloses an aluminum alloy round ingot casting for a computer hard disk drive arm. The ingot casting comprises 0.60 to 0.80% of Si, 0.10 to 0.20% of Fe, 0.90 to 1.1% of Mg, 0.10 to 0.30% of Cu, 0.10 to 0.20% of Mn, 0.10 to 0.30% of Cr, smaller than 0.03% of single impurities and the balance Al. The production method comprises the steps that pure aluminum ingot solid cold charge andelectrolytic aluminum liquid are burdened, heating and melting are carried out at the proper temperature, an electromagnetic stirrer is started to rapidly melt the cold charge, temperature uniformityand component uniformity are kept, according to the chemical components in aluminum melt, alloying treatment is carried out, slagging-off is carried out to kept melt clean, high-purity N2 and a refined powder spraying agent are adopted to carry out powder spraying refining, online filtering, slag removal and gas removal are achieved, and through casting production and uniform heating treatment, the aluminum alloy round ingot casting meeting the requirement is produced. The ingot casting is stable and uniform in component, compact in internal structure, smooth and clean in surface, excellent inmechanical performance, and high in product interior cleanness, and the method is an optimal method for producing the aluminum alloy round ingot casting for the computer hard disk drive arm.

The invention discloses a scanning method for keeping the uniform temperature of an electron beam cold bed furnace rectangular crystallizer. The scanning method includes the following steps that the size of the crystallizer is confirmed, the crystallizer is divided into five equal parts in the length direction, and equal dividing marks convenient to observe are arranged on the outer side of the crystallizer, the crystallizer is installed on a dummy ingot system to be leveled and well fixed, after normal work of a water cooling system, a dummy ingot system and a vacuum system is confirmed, an electron beam responsible for scanning the crystallizer is arranged for scanning a pattern, virtual thermal imaging is conducted on the set patterns, thermal uniformity of the scanned pattern is confirmed, and smelting can be conducted after vacuum reaches a preset value. The scanning method is simple in design, convenient to operate, good in using effect, capable of effectively overcoming the defects such as layer folding, cold isolating, scabbing, waisting and hole shrinking on the surface of a rectangular slab, and capable of effectively improving the quality of the surface of the slab, reducing the face milling amount and improving the one-time yield.

A method of making an aluminum alloy plate for bearing which is made by cladding a bonding layer comprising a pure aluminum or an aluminum alloy excluding Sn onto a bearing alloy layer comprising an aluminum alloy containing Sn. The method includes the steps of fitting a concave portion of a first roll in a convex portion of a second roll, the first roll having both axial ends with large diameter portions respectively, the second roll having both axial ends with small diameter portions respectively, and passing superposed plates formed into the bearing alloy layer and the bonding layer respectively through a roll gap defined between the concave and convex portions and closed by the large diameter portions of the first roll so that the plates are rolled down at a reduction ratio not less than 50% while both widthwise ends of each plate is restricted by the large diameter portions of the first roll respectively such that the bonding layer is cladded onto the bearing alloy layer.

In the continuous casting of round or polygonal billet and bloom formats, use is made of moulds the mould cavity of which comprises a copper tube (3) which is intensively cooled by means of water-circulation cooling. In order to increase the cooling capacity on the one hand and the dimensional stability of the mould cavity (4) on the other hand, and also extend the total service life of the copper tube (3), it is proposed to provide the copper tube (3) with a supporting shell (12) or supporting plates over the entire circumference at the tube outer lateral surface (5). For the cooling of the copper tube (3), cooling ducts (6) for guiding the cooling water are arranged on the copper tube (3) or on the supporting shell (12). The cooling ducts (6) are distributed over the entire circumference at the tube outer lateral surface (5) and extend substantially over the entire mould length.

The continuously casting process of thin magnesium alloy strip plate includes the following steps: preheating and smelting alloy blank in melting furnace with flux; preheating the side sealing system to 400-450 deg c before casting, transferring the melt at 650-680 deg c to pouring basket and maintaining for 15-30 min under the action of flux, feeding via melt distributor to equal diameter double roller vertical continuous casting machine under the action of protective gas, casting in immersion mode and casting speed of 20-100m/min for casting-rolling, and feeding the strip plate from the casting rollers to the pinch rollers under protecting gas action. The cast thin magnesium alloy strip plate has thickness of 1.0-3.5mm. The present invention produces thin magnesium alloy strip plate directly with molten magnesium alloy, and has the advantages of high product quality, homogeneous inner structure, being favorable to subsequent processing, short technological process and low cost.