40results about How to "No burning loss" patented technology

The invention relates to a preparation technology of a CBN (cubic boron nitride) ceramic grinding wheel for wholly grinding the end surface and the outer circle of a crank shaft flange, which comprises the following steps: mixing the following raw materials in parts: 15-20 parts of boric anhydride, 35-45 parts of lepidolite, 30-40 parts of soda feldspar and 5-10 parts of Na2CO3; firing at high temperature; carrying out ball milling on nano Al2O3 powder, nano mullite powder and the pre-molten ceramic powder according to a mass ratio of 2:2:6, and uniformly mixing to obtain a bonding agent; based on the volume percent, uniformly mixing 35% of low-temperature bonding agent, 5% of white alundum, 10% of Al2O3 hollow sphere and 50% of CBN, and prepressing into a sheet to obtain an end surface abrasive layer; based on the volume percent, uniformly mixing 35% of bonding agent, 8% of white alundum, 7% of Al2O3 hollow sphere and 50% of CBN, and prepressing into a sheet to obtain an outer circle abrasive layer; laminating the end surface abrasive layer sheet and the outer circle abrasive layer sheet, and adding the two sheets to an aqueous polyvinyl alcohol solution; and pressing into a fixed shape, and sintering in a high-temperature furnace. The bonding agent has low firing temperature, high folding strength and favorable abrasive binding property; the invention improves the abrasive wetting property of the bonding agent, improves the cutting efficiency of the abrasive, lowers the cost, enhances the abrasive coating capability and strength of the bonding agent and raises the sintering temperature of the bonding agent; and the strength of the CBN is not changed, and the surface is not subjected to burning loss.

A full-automatic in-line hydraulic bevel shearing machine for bevel shearing of hot steel billet on conticasting production line is composed of base, machine frame arranged obliquely on the base and consisting of left and right frames and upper and lower beams, guide tracks on left and right frames, shearing unit consisting of upper and lower V-shaped shearing knives and their holders, press unit consisting of cylinder and its supporter, pressing head and guide rod, and walking unit on said base.

The invention discloses a cubic boron nitride (CBN) ceramic high speed grinding wheel which comprises a steel substrate and a working abrasive layer. The working abrasive layer comprises an abrasive layer and a middle transition layer. The abrasive layer comprises the following materials: low temperature binding agent, white corundum, ceramic floating bead and CBN. The middle transition layer comprises the following materials: low temperature binding agent and 150-mesh ceramic balls. The low temperature binding agent includes the following materials by volume: 8-12 parts of nanoscale aluminum oxide, 8-12 parts of nanoscale silica and 75-85 parts of premelting ceramic powder. The premelting ceramic powder includes the following materials by volume: 25-35 parts of aluminum oxide, 27-37 parts of silica, 4.5-5.5 parts of sodium oxide, 1.5-2.5 parts of potassium oxide, 1.5-2.5 parts of magnesium oxide, 0.8 part to 1.2 parts of calcium oxide and 5-11 parts of diboron trioxide. The CBN ceramic high speed grinding wheel has the advantages that firing temperature of the ceramic binding agent is 750 DEG C, rupture strength can reach 115MPa, and the CBN strength is basically not lost under the temperature, so that cutting performance of the CBN grinding wheel is greatly improved. A preparation method and the application of the CBN ceramic high speed grinding wheel are further provided.

The invention discloses a large-size high-niobium high-temperature 706 alloy ingot and its smelting process, which are used to solve the problem of serious burning loss of Al and Ti elements in the existing smelting process and the high-niobium high-temperature 706 alloy ingot easily produced Metallurgical defects of black and white spots. The smelting process includes: vacuum induction smelting, making multiple vacuum induction ingots with the same composition, and then making the same number of electroslag electrodes, using (CaF 2 ‑CaO‑Al 2 o 3 ‑TiO 2 ) quaternary slag, exchange electroslag remelting, and then use the obtained electroslag ingot to make a consumable electrode, and then use the consumable electrode as the starting material to carry out two vacuum consumable remelting. This process can realize the preparation of large-size ingots of high-niobium high-temperature 706 alloys with an ingot weight of more than 15 tons and a diameter of more than 800mm, which can minimize the formation of black spots and white spots and reduce the burning rate of Al and Ti elements.

The invention relates to the technical field of recycled aluminum, and provides a green smelting method for recycled aluminum alloy. After aluminum secondary resources obtained after paint removal aresmelted and subjected to component adjustment, argon refining and argon degassing are adopted at a certain temperature, argon is introduced into a recycled aluminum alloy melt, inclusions and hydrogen are brought out of the melt, and a recycled aluminum alloy melt with high purity and low hydrogen content is obtained; the argon is fine and dispersed argon bubbles when introduced; the argon introduction mode is one or two of introduction from air-permeable bricks at the bottom of a smelting furnace and introduction from an air guide pipe; and the average size of the bubbles during argon introduction is 0.5-20.0 mm. According to the method, salt refining agents and nitrogen degassing agents are not used, the nitrogen burning loss is avoided, generated aluminum slag does not contain pollutants such as salt and aluminum nitride, and the obtained recycled aluminum melt is low in hydrogen and inclusions content. The quality of a recycled aluminum product is good, the method is simple and effective, and the application prospect is wide.

The invention discloses a technology for producing a CBN (Cubic Boron Nitride) high-speed ceramics grinding wheel, comprising the following steps of: mixing following raw materials in part by weight: 15 to 20 parts of boron anhydrous, 35 to 45 parts of lepidolite, 30 to 40 parts of albite and 5 to 10 parts of Na2CO3; firing at a high temperature; carrying out the ball milling and uniform mixing on nanometer AL2O3 powder, nanometer mullite powder, pre-melted ceramics powder according to the mass ratio of 2:3:5 to obtain the product of binding agent, wherein a grinding material layer comprises 35% of binding agent, 8% of white corundum, 7% of alumina hollow ball and 50% of CNB, an intermediate layer comprises 35% of binding agent and 65% of ceramics balls of 150 meshes; after equably mixing the materials, adding a polyethylene water solution; pressing into a fixed shape; and firing in a high temperature furnace after drying. The technology for preparing the CBN high speed ceramics grinding wheel has the advantages that the binding agent has low firing temperature and strong rupture strength and can bind the grinding material well and wet the grinding material better, the cutting efficiency of abrasive particles is improved, the cutting cost of abrasive particles is reduced, the packaging capacity of the binding agent to the grinding material, the intensity and the sintering temperature are increased, the CNB intensity is not changed and the surface of the CNB is not burnt.

The invention relates to a rare earth aluminium alloy material with high strength and high toughness and the preparation method thereof, belonging to the technical field of metal alloy and the preparation thereof. The invention is characterized in that the invention comprises Mg, Si, Fe, a rare earth compound additive and Al, with the weight percentages as follows: Mg: 0.50-0.60%; Si: 0.35-0.45%;Fe less than or equal to 0.35%; rare earth additive less than or equal to 0.065-0.2%; the margin being Al. The preparation method comprises charging and melting down the 6063 aluminum alloy furnace materials in accordance with the conventional methods, adjusting the furnace temperature, deairing, refining and purifying the melt and then adding Al-RE, Al-Sr and Al-Zr master alloys at the temperature between 720 DEG C and 760 DEG C and preserving heat for 30min-7h, then carrying out homogenization treatment on electromagnetic stirring components and detection, pouring and casting, finally carrying out homogenization treatment and subsequent quick cooling treatment, rapid heating before extrusion, extrusion and on-line quenching treatment as well as artificial aging treatment. The product section obtained from the invention has rapid extrusion and high mechanical property of the section and can improve the apparent mass of the section and increase the modification of oxide film density.

The invention discloses a technology for producing lead-acid storage batteries through temperature control method, belongs to the field of lead-acid storage battery production and solves the problem of the poor battery welding quality of a cast-welding technology through a time control method. The method comprises the processes of feeding of plate packs in an assembly box, electrode tab arranging, cutting and brushing of electrode tabs, dipping of flux, cast-welding, inspection and discharging after qualification. The cast-welding process is completed through a cast-welding machine and comprises the following steps: 1) heating of a lead pan; 2) preheating of a lower die; 3) scrapping of molten lead; 4) electrode tab cast-welding; 5) die removal; and 6) secondary preheating of the lower die. The technology is used for manufacturing lead-acid storage batteries.

The module has the hot gas directed to at least one flow path containing at least one monolithic ceramic absorber element (10,10',10'') packed into a flow chamber (40) for the hot gas and provided with channels (11) for passage of the hot gas having a cross-section of between 2 and 10 mm and extending in the main flow direction.