45results about How to "Refine matrix tissue" patented technology

The present invention discloses compound high speed steel roll and its making process. The compound high speed steel roll consists of roll body and roll core compounded through central casting. The roll body is made of high speed steel comprising chemically C 1.8-2.8 (in wt%, same as below), Mo 4.0-8.0, V 3.0-7.0, Nb 1.5-4.0, Cr 6.0-12.0, RE 0.1-0.25, Ti 0.15-0.40, N 0.08-0.20, K 0.06-0.18, Si<2.0, Mn<2.0, S<0.05 and P<0.05, except Fe and inevitable impurity. The roll core is made of high strength nodular cast iron comprising chemically C 3.2-3.6 (in wt%, same as below), Si 1.8-2.4, Mn 0.4-0.8, Ni 0.3-1.2, Cr 0.3-0.8, Mo 0.2-0.5, Mg 0.03-0.08, RE 0.05-0.14, P<0.08 and S<0.03, except Fe and inevitable impurity. The compound high speed steel roll has high wear resistance, simple making process and high production efficiency.

The invention discloses a method for adjusting and regulating a long-periodic structure phase of magnesium alloy. The method comprises the steps of: firstly preparing Mg-Ni (or Zn)-Y alloy containing LPSO, and then adjusting and regulating form and distribution of a long-periodic structure by applying ultrasonic vibration and pressure in sequence in an alloy solidification process. The alloy preparing and processing comprises the following steps: melting the alloy under protection of mixed gas of N2 and SF6, after temperature reaches 720-730 DEG C, placing a melt in a container in a holding furnace, cooling to a temperature more than a liquidus temperature of the alloy by more than 10-50 DEG C, then performing ultrasonic vibration processing on the melt, lasting for 1-5min, after the vibration is finished, pouring into a preheated die of 200-300 DEG C for extruding to solidify under pressure, wherein an extruding pressure is 50-500 MPa, and pressure holding time is 1-3min. The LPSO phase in the alloy prepared by such method is obviously refined and uniformly distributed, and performances of the alloy are greatly improved.

The invention discloses an abrasion-resistant lining plate for a cone crusher and relates to the technical field of crusher lining plates. Alloy elements in the lining plate include 2.30-2.80% of C, 22.0-24.0% of Cr, 1.32-1.85% of Si, 0.15-0.23% of Mn, 0.17-0.32% of B, 0.25-0.40% of V, 0.15-0.28% of N, 0.15-0.26% of W, 0.54-0.82% of Cu, 0.02-0.06% of Ce, 0.15-0.22% of Al, 0.07-0.12% of Co, 0.22-0.35% of Ti and the balance Fe and unavoidable impurities. The ratio of the optimized elements is more reasonable and all the elements achieve the synergistic effect, so that the lining plate is high in hardness, good in tenacity and resistant to impact and abrasion; the service life of the lining plate is two to three times longer than that of a common steel abrasion-resistant material; the lining plate meets the work demands of medium and large cone crushers; besides, the raw material sources are rich, precious metal such as Mo and Ni are not contained, and the production cost is low.

The invention discloses a high-precision full-automatic casting machine. The high-precision full-automatic casting machine comprises a casting ladle system, a casting ladle transverse moving and longitudinal moving system, a servo tilt-rotating mechanism, a detection unit and a control unit. The casting ladle system comprises a casting ladle made of thermal insulation materials and a casting ladle moving device. The casting ladle transverse moving and longitudinal moving system comprises a track system and a casting vehicle. The detection unit comprises a load sensor. The load sensor is used for detecting the weight of molten metal in the casting ladle of the casting machine and generating a signal representing the detected weight. The control unit is provided with a first arithmetic unit, a second arithmetic unit and a driving indication unit. The casting machine can effectively shorten the casting time and improve the casting stability.

The invention relates to a casting process for a crankshaft. The casting process comprises the following steps: step S01: producing a sand mould according to the design dimension requirements of the crankshaft, horizontally arranging the axis line of the sand mould, forming a direct gate and an inner gate in the sand mould, connecting the direct gate with the inner gate through a transversal channel, roasting the sand mould for 20 minutes at a high temperature of 750-900 DEG C, and then cooling to 400 DEG C; step S02: smelting a steel material in a circuit, after a temperature rises to 1400-1500 DEG C, adding a refining agent and refining for 20min to obtain molten steel in which a carbon content is 0.1-0.14%, a silicon content is 0.15-0.19%, a nickel content is 0.36-0.45% and a manganese content is 0.46-0.55%; step S03: pouring the molten steel in the step S02 into the direct gate and the inner gate of the sand mould in the step S01, controlling a pouring temperature to be 1560-1660 DEG C and controlling a pouring time to be 40s, and after the pouring is finished, insulating for 30min; and step S04: cooling to normal temperature, talking out the formed crankshaft, cleaning the surface of the crankshaft, and then polishing to obtain the crankshaft.

The invention relates to a smelting method of high-toughness and high-strength casting-state ductile cast iron. The smelting method comprises the steps of 1, material selection, in which pig iron, scrap steel and a melting-back material are selected as raw materials; 2, material preparation, in which 20-40% of pig iron, 30-40% of scrap steel and 20-50% of melting-back material are selected according to percent by mass; 3, smelting, in which the raw materials prepared in the step 2 are added into a medium-frequency smelting furnace, the temperature is raised, the raw materials are molten, a carburant is added to the bottom of the furnace during smelting, and the raw materials are molten to a required furnace outlet temperature; 4, nodulization and casting, in which a nodulization pack and acasting pack are pre-heated to 600-800 DEG C before nodulization, a nodulizing agent, an inoculation agent and a coverage agent are sequentially placed in the nodulization pack placement pit, and inoculation for three times is performed; and 5, box outlet. The smelting method is simple to operate; and by adding the scrap steel and the melting-back material in a large proportion, the production cost is low, and the mechanical property is improved by a reasonable proportion.

The invention discloses a high-precision magnesium alloy sheet which is prepared from the following raw materials: 0.2% of yttrium, 0.06% of titanium, 0.05% of cerium, 0.05% of lanthanum, 0.02% of samarium, 0.5% of zinc, 2% of manganese and the balance of magnesium. The invention also discloses a preparation method of the magnesium alloy sheet. The magnesium alloy sheet disclosed by the invention has the advantages of favorable corrosion resistance and greatly higher physicochemical parameters (fracture strength, elongation percentage and the like), has high market application value, and can be used in the fields of automobile transmission cases, motor casings and the like.

The invention discloses an automobile engine cylinder cover and a manufacturing method thereof. The automobile engine cylinder cover is a product prepared by the following raw materials and the manufacturing method, and comprises the raw material composition by weight: 90% of gray iron cuttings, 10% of casting roughing sand, 5% of a furan resin, and 1.0% of a curing agent. The method has the beneficial effects of effectively preventing generation of defects of casting shrinkage cavities, shrinkage porosity, deformation and cracks.

The invention belongs to the field of steel and iron and particularly relates to a steel plate with the thickness of smaller than 60mm and the yield strength of 690MPa. The steel plate contains the following chemical components in percentage by weight: 0.10-0.20% of C, 0.15-0.50% of Si, 1.00-1.60% of Mn, 0.10-0.60% of Cr, 0.015-0.050% of Als, 0.008-0.025% of Ti, 0.10-0.30% of Mo, 0.0008-0.0030% of B, less than or equal to 0.025% of P, less than or equal to 0.008% of S, less than or equal to 40ppm of N, less than or equal to 20ppm of O, less than or equal to 2ppm of H and the balance of Fe and unavoidable impurities. The steel plate provided by the invention has favorable mechanical properties, plasticity and toughness, has the yield strength of larger than or equal to 690MPa, and can be applied to manufacture of large engineering machines or steel structures such as hydraulic supports for coal mines, heavy engineering machines, ocean platforms and the like.

The invention belongs to the technical field of metal materials and metallurgy, and discloses an Al-Mn pipe alloy of a household air conditioner heat exchanger and a preparation method of the Al-Mn pipe alloy. The Al-Mn pipe alloy comprises, by weight: Mn: 0.5-1.0%, Mg: 0.1-0.5%, Zn: 0.1-0.4%, Fe: 0.1-0.4%, Si: 0.05-0.4%, Cu: 0.01-0.15%, Ti: 0.02-0.3%, Cr: 0.05-0.4%, Zr: 0.02-0.3%, and the balanceAl and impurities. The preparation method comprises the steps of melting an aluminum ingot into an aluminum melt; adding a magnesium ingot and an intermediate alloy into the aluminum melt; stirring to form an alloy melt; casting the alloy melt into a casting; and extruding, drawing and annealing the casting to obtain the Al-Mn pipe alloy of the household air conditioner heat exchanger. Accordingto the Al-Mn pipe alloy of the household air conditioner heat exchanger and the preparation method of the Al-Mn pipe alloy, the corrosion resistance, strength and toughness of the alloy is improved, and the product quality of the household air conditioner heat exchanger is favorably improved.

The invention provides a high-chromium alloy cast ball and a casting method thereof. The high-chromium alloy cast ball comprises the following components in percentage by weight:1.6-2.5% of C, 15-19%of Cr, 0.7-1.1% of Cu, 0.2-0.7% of Mn, 0.4-0.8% of Mo, 0.02-0.05% of V, 0.1-0.4% of Y, 0.7-1.2% of B, 0.004-0.009% of Nb, 0.002-0.007% of Ta, less than 0.02% of P, less than 0.01% of S and the balanceof Fe. The casting method comprises the following steps: (1) raw material smelting: adding the raw materials calculated in proportion into a high-frequency induction furnace for high-temperature smelting, adding a deslagging agent for deslagging after furnace charge is completely molten, adding 0.05% of aluminum for deoxidation, discharging, and adding an inoculant along with flow in the discharging process; 2, pouring moulding: setting the pouring temperature from 1420 DEG C to 1440 DEG C, setting the pouring time from 5 min to 9 min, and obtaining the high-chromium alloy cast ball primary finished product; 3, enabling the high-chromium alloy cast ball primary finished product to be subjected to heat treatment to obtain the high-chromium alloy cast ball finished product. The high-chromium alloy cast ball has excellent abrasion resistance and impact resistance, high hardness and long service life.

The invention provides a cast production method of a heavy truck front axle, and belongs to machinery. Copper-nickel alloying isothermal quenching ductile iron is adopted in the method, has higher strength and toughness when compared with conventional copper-molybdenum alloying isothermal quenching ductile iron, and can prolong the service life of the front axle. The blank of the front axle is cast through an iron-mould coated sand technology method; and a tundish pouring method is employed during spheroidizing and enables the spheroidising more stable. Machining is employed before isothermal quenching in the method, and the front axle is prevented from deformation. The isothermal quenching treatment is carried out on a salt furnace production line containing a protective atmosphere, and a matrix structure of austenite+acicular ferrite is generated, so that the toughness of the front axle is greatly improved. The cast production method is advantaged in that material revolution of replacing forging with casting and replacing steel with iron is realized; heavy forging equipment and die investment are saved; a production cycle is shortened; and the cast production method has obvious economic benefits and social benefits.

The invention discloses a production method of a steel wear-resisting plate BTW for a coal mine. The production method comprises the procedures of steel ingot cogging, blank heating, high-pressure water dephosphorization, rolling, cooling and straightening. Through heating curve control and rolling schedule design optimization, rapid cooling control is achieved after rolling, and the steel wear-resisting plate BTW for the coal mine is obtained and is widely applied to the coal mine field, wherein the surface quality of the steel wear-resisting plate BTW for the coal mine is good, and strengthand wear resistance of the steel wear-resisting plate BTW for the coal mine meet user requirements. The thickness specification of the obtained steel wear-resisting plate BTW for the coal mine rangesfrom 15 mm to 50 mm; and after use performance is agreed by users, tensile strength is larger than or equal to 700 MPa, yield strength ranges from 400 MPa to 480 MPa, and ballistic work is larger thanor equal to 80 J. The plate shape of the wear-resisting plate BTW is level, flatness is smaller than or equal to 5 mm/1 m, surface quality meets class B of GB/T14977 requirements, and zero-coping delivery of the steel plate is achieved.

The invention provides inoculated cast iron and a preparation method thereof and belongs to the field of metal materials. The inoculated cast iron comprises, by weight, C 3.3-3.5%, Si 1.3-1.5%, Mn 1.3-16%, P 0.03-0.05%, S 0.06-0.07%, Cr 21-23%, Nd 0.25-0.29%, Sn 0.25-0.29%, Ti 0.25-0.29%, Se 0.25-0.29% and the balance Fe. The preparation method comprises the steps of weighing raw materials, preparing molten alloy, adding Nd-Sn-Se-Ti-Zn into the molten alloy, casting a mixture into casting ingots, and performing heating, heat preservation, air quenching and tempering to obtain the inoculated cast iron. The inoculated cast iron has good comprehensive performance, the material cost is low, and the preparation method is simple.

The invention discloses a casting die and a casting process of a die-casting machine rubber injection head plate. The casting die comprises a die body, wherein the die body comprises an upper die and a lower die; at least two cavities which correspond to the rubber injection head plate are formed between the upper die and the lower die; a gate sprue is formed in the upper die, and is communicated with two sides of the cavities through cross gates; two ends of each cross gate are respectively communicated with the bottoms of two sides of the cavities through the ingates; and exhaust holes are also formed in the upper ends of the cavities. The ingates are communicated with the side surfaces of the cavities, and the walls corresponding to the ingates are not thick, so that cooling balance is formed, and the simultaneous solidification effect is reached. Through utilization of an instantaneous flow inoculation process, the matrix structure is refined; the compactness is improved; and the shrinkage rate is reduced. Due to the adoption of the improved process, the defect of shrinkage of shrinkage cavities is basically removed; the oil leakage rate after installation is only 1%-1.5%; the yield is greatly improved; and obvious economic benefits are obtained.