44results about How to "Improve solidification quality" patented technology

The invention belongs to the field of casting technologies and new materials and particularly relates to a high-strength high-tenacity cast-state QT700-10 and a production method thereof. Compared with ductile iron produced in the prior art, the high-strength high-tenacity cast-state QT700-10 has high strength and a high elongation rate, heat treatment is not needed, heavy metal, such as, Ni and Mo are not added in production, the tensile strength Rm in the cast state is larger than or equal to 700 MPa, the elongation rate A is larger than or equal to 10%, compared with the standard brand QT 450-10, the lowest tensile strength is improved by 55% under the same elongation rate; and compared with the standard brand QT 700-2, the lowest elongation rate is improved by four times under the same tensile strength. The high-strength high-tenacity cast-state QT700-10 can meet requirements of automobile ductile iron castings with high requirements for safety and comprehensive mechanical properties.

The invention relates to a kerf-valving external water-cooled type electromagnetic soft contact continuous casing crystallizer, comprising a kerf copper pipe (1), an upper-section inner water jacket (3), a lower-section inner water jacket (2), an electromagnetic induction coil (4), a shell (8), an upper flange (9) and a lower flange (10), wherein the shell (8), the upper flange (9) and the lower flange (10) constitute a crystallizer assembly structure; the upper-section inner water jacket is made of engineering plastics and is sleeved in the electromagnetic induction coil; a groove (12) is machined on the outer wall of the outer wall surface of the kerf copper pipe along each kerf (5); a high-temperature resisting insulation sheet (11) is inserted into each kerf; bonding glue (120) is coated and filled in the groove; the edge of the inserted tail end of the insulation sheet slightly protrudes out of the bottom plane of the groove; and the high-temperature resisting insulation sheets and the serf copper pipe are fixed by the binding glue. A top rib sealing bar (8) which aims at each kerf is arranged between the outer wall of the kerf copper pipe and the upper-section inner water jacket. The invention has the advantages of strong electromagnetic permeability and safe and reliable cooling water path.

The invention discloses a method for producing a composite roll by preheating consumable electrode electroslag remelting and belongs to the technical field of electroslag remelting. The method for producing the composite roll comprises an eccentric crystallizer, a bottom water tank and a metal consumable electrode. The eccentric crystallizer comprises an upper crystallizer and a lower crystallizer, the diameter of the lower crystallizer is smaller than the diameter of the upper crystallizer, the lower crystallizer is arranged under the upper crystallizer, and axes of the upper crystallizer andthe lower crystallizer are not on the same straight line; the metal consumable electrode is arranged above the upper crystallizer, the bottom water tank is arranged below the lower crystallizer, andthe metal consumable electrode and the bottom water tank are respectively connected with two poles of a power supply. The material thickness of a working surface can be adjusted flexibly with eccentric design of the electroslag remelting crystallizer; the metal consumable electrode is externally surrounded by an induction coil, so that the consumable electrode can be preheated in the remelting process, electrode melting is accelerated, mass melting of a surface layer of a roll core is avoided, and therefore the roll core and a roll body are effectively welded.

The invention discloses a method for improving solidification quality of an electroslag remelting steel ingot and relates to the technical field of electroslag remelting. The method for improving thesolidification quality of the electroslag remelting steel ingot. When a smelting device is adopted for smelting, consumable metal of a metal electrode is inserted into liquid state slag of a smeltingcrystallizer, a positive pole of a pulse power source is connected with the metal electrode, a negative pole of the pulse power source is connected with a bottom water tank, the pulse power source iselectrified and an electric circuit is formed, and the consumable metal of the metal electrode is re-smelted and re-solidified, so that the steel ingot is obtained. When the smelting device is adoptedfor smelting, the metal electrode leads pulse current of the pulse power source to the smelting process, the pulse power source is electrified and an electric circuit is formed, and the consumable metal of the metal electrode is re-smelted and re-solidified, so that the steel ingot is obtained.

The invention discloses a melting device for improving the solidification quality of an electroslag re-melting steel ingot and belongs to the technical field of electroslag re-melting. The melting device comprises a pulse power supply, a melting crystallizer, a metal electrode and a bottom water tank, wherein the bottom water tank is arranged at the bottom of the melting crystallizer, the interiorof the melting crystallizer is used for accommodating a metal molten pool and an electroslag layer; a metal electrode is inserted inside the melting crystallizer, consumable metal at the bottom of the metal electrode is inserted in the electroslag layer, a positive electrode of the pulse power supply is connected with the metal electrode, and a negative electrode of the pulse power supply is connected with the bottom water tank. The melting device disclosed by the invention has the benefits that the positive electrode of the pulse power supply is connected with the metal electrode, and the negative electrode of the pulse power supply is connected with the bottom water tank; the pulse power supply applies pulse current to the metal molten pool and generates weak disturbance to the molten metal pool, so that the uniformity of a temperature field of the molten metal pool can be promoted. Therefore, the characteristic similar to directional solidification growth is realized, and the solidification quality of the steel ingot is improved.

The invention discloses an electroslag remelting device for producing a composite roll by preheating a consumable electrode and a method of the electroslag remelting device, belonging to the technicalfield of electroslag remelting. The electroslag remelting device comprises an eccentric type crystallizer, a bottom water tank and a metal consumable electrode, wherein the eccentric type crystallizer comprises an upper crystallizer and a lower crystallizer, the diameter of the lower crystallizer is smaller than that of the upper crystallizer, the lower crystallizer is arranged at the lower partof the upper crystallizer, and the axle centers of the upper crystallizer and the lower crystallizer are not located on the same straight line; and the metal consumable electrode is arranged at the upper part of the upper crystallizer, the bottom water tank is arranged at the lower part of the lower crystallizer, and the metal consumable electrode and the bottom water tank are respectively connected with two poles of the power supply. By utilizing an eccentric design of the electroslag remelting device, the thickness of the material of a working surface can be flexibly adjusted; the metal consumable electrode is externally wound with an induction coil and can be preheated in the remelting process, so that the melting of the electrode is accelerated, the substantial melting of surface layers of a roll core is avoided, and the roll core and a roll body are effectively welded.

A system for on-line measuring the thickness of a continuous casting billet and adjusting a rolling reduction amount, is capable of giving an accurate, constant and rapid feedback on the thickness of the billet in the continuous casting process online, avoiding the deviation of the rolling reduction amount of the billet in the continuous casting production process which is triggered by the factors such as the capacity of the continuous casting equipment, the execution deviation of the rolling reduction process, the metal solidification attribute such as non-preset expansion and contraction, so as to maximize the function of the continuous casting rolling reduction and improve the solidification quality of the billet.

The invention provides a novel control method of the vibration of a double-roll thin-strip continuous casting casting-roll side sealing plate. Side sealing plate vibration self-adaptive control equipment is composed of side sealing plates, a four-bar linkage, a hydraulic cylinder, a servo valve, a displacement sensor, a proximity switch, a pressure sensor, a programmable controller (PLC), a human-machine interface (HMI) and the like. In a continuous casting process, two casting rolls and two side sealing plates located on the end surfaces of the casting rolls form a molten pool, and molten steel is poured in and condensed into strip steel to be sent out of the molten pool through the rotation of the casting rolls and cooling. Through the reciprocating movement of the side sealing plates, the molten steel on the end surfaces of the casting rolls and the condensed steel strip are beaten, the vibration force generated by the beating can improve the condensing quality of the strip steel, through adaptive control, gaps between the side sealing plates and the end surfaces of the casting rolls are guaranteed, the friction between the side sealing plates and the end surfaces of the castingrolls is reduced, and the service life of the casting rollers and the side sealing plates is prolonged.

The invention provides a smelting method of a manganese-aluminum-iron-nickel bronze alloy ingot. The smelting method comprises the following steps: firstly, cleaning the defects of burnt-on sand and flash on the surface of a copper alloy electrode; then, the copper alloy electrode is connected to an electrode chuck through a welding or mechanical connection method, and the copper alloy electrode is baked to be completely dried; then, the slag materials of the CaF2-NaF-AlF3 ternary slag system or the CaF2-NaF-BaF2 ternary slag system are independently baked, and the slag materials obtained after baking are weighed according to the proportion and mixed to be uniform; the evenly-mixed slag materials are laid to the bottom in a crystallizer, and the slag materials are electrically polarized through graphite; electroslag remelting is conducted by exchanging the copper alloy electrode, inert atmosphere protection is conducted in the whole remelting process, power is cut off after electroslag remelting is completed, and the protective atmosphere is maintained for slow cooling; and finally, the crystallizer is removed, slag crust on the surface of the electroslag ingot is removed, and the manganese-aluminum-iron-nickel bronze alloy ingot is obtained. According to the method, the defects of air holes and segregation generated during casting of the manganese-aluminum-iron-nickel bronze alloy and the defect of high control difficulty can be effectively overcome, and production of high-homogeneity and low-microporosity cast ingots is achieved.

The invention discloses a multi-sprayer foam concrete spreading device and operation method, and belongs to the field of foam concrete construction. The multi-sprayer foam concrete spreading device mainly comprises a moving frame, a mobile station, a spreading rod and the like; and is characterized in that 1, the number and inner diameters of sprayers can be selected from multiple schemes, the universality is high, the device is suitable for various types of foaming machines and delivery pumps, the flow velocity of foam concrete slurry is adjustable, and a best foam concrete spreading effect can be achieved; 2, the sprayers disperse the kinetic energy of the slurry intensively ejected from the tail end of a delivery hose, weaken the impact force, reduce the probability that multiple smallpores are communicated with one other to form big pores, and improve the compressive strength of foam concrete; 3, the mechanical automation degree is high, operators are reduced, the labor intensityis reduced, the sanitary conditions of environmental protection are improved, artificial disturbance is avoided, and the solidification quality of the foam concrete is improved. The multi-sprayer foamconcrete spreading device is combined with the corresponding operation method, so that the spreading efficiency and quality can be improved, energy is saved, emission is reduced, and the economic benefits and social benefits are significant.

The invention provides a die-casting die capable of adjusting the flow field state in a die cavity, and belongs to the technical field of die-casting dies, the die-casting die comprises a die body provided with a cavity and a pouring gate, and the pouring gate is communicated with the cavity; and the exhaust hole group is arranged on the mold body and communicated with the cavity, and the exhaust hole group can exhaust gas in the cavity to the outside. The invention further provides a die-casting process, and belongs to the technical field of die-casting processes. The method has the beneficial effects that the exhaust holes are formed in the important areas of the cavity, the air suction devices are installed at the exhaust holes, in the die-casting and mold-filling process, according to the specific requirements of the technology, rapid air exhaust is conducted on the different exhaust holes, the air flow state in the cavity is adjusted, and therefore molten metal is guided to enter the designated areas in sequence; molten metal mold filling sequences and mold filling states of different areas are regulated and controlled, the state of the die-casting mold filling process is improved, and therefore high-quality die castings compact in structure and excellent in performance are obtained.

The invention discloses an umbrella-type submersed nozzle of a crystallizer for continuous-cast round billets. The umbrella-type submersed nozzle comprises a nozzle side wall with an inner hole formed in the upper portion, a concave bottom plate with the lower portion closed, at least one side support hanging column for connecting the nozzle side wall and the concave bottom plate into a whole, and a lateral outlet arranged on the lower portion of the nozzle side wall. The lateral outlet is an annular outlet penetrating through the circumferential side wall of the whole nozzle, and the annular outlet inclines downward by an angle of alpha and is shaped like an umbrella. Molten steel can be injected in through the inner hole of the nozzle side wall and evenly flows out of the lateral outlet in the circumferential direction. Compared with the prior art, the umbrella-type submersed nozzle has the advantages that green billet shells will not be scoured or damaged, and thus the thickness of the billet shells is uniform in the circumferential direction; the flow field of the molten steel in the crystallizer is reasonable in distribution, an upper ring flow and a lower ring flow are formed in the upper flow field of the crystallizer, and thus casting powder can be molten easily; the impact depth of the molten steel is small, and thus gas and inclusions can float up easily. The superiority of the umbrella-type submersed nozzle can be better played for continuous cast of round billets with the diameter of the fracture surfaces of the cast billets larger than 400 mm.