521 results about "Ingot casting" patented technology

The invention belongs to the technical field of aluminum alloy materials, and particularly discloses a preparation method of a cast-rolled 8021 alloy aluminum foil, an 8021 alloy blank with the thickness of 6-8 mm is produced through cast rolling, the blank is subjected to direct homogenizing annealing under the condition of not cooling, is rolled through a cold rolling production process, and then is subjected to edge cutting, secondary intermediate annealing and foil rolling to be subjected to multi-pass rolling to obtain the finished product with the thickness. Compared with a traditional direct-cooling cast ingot hot rolling process, multiple links such as hot-rolled plate ingot casting, ingot blank sawing and face milling, uniform annealing and large-machining-amount hot roughing mill cogging rolling are omitted, energy is saved, consumption is reduced, carbon dioxide emission is reduced, the performance of a finished product is equal to or even superior to that of a hot-rolled product, and the use requirements of customers are met.

The invention provides a manganese-silicon alloy and a production method thereof, and the production method comprises the following steps: respectively crushing a manganese-containing material, silica and coke in proportion, mixing with a dephosphorizing agent, adding a binder and a proper amount of water to prepare a premix, pressing the premix into smelted pellets, and drying; the dried smelting pellets are put into a closed electric furnace to be smelted, and alloy melt is obtained; transferring the alloy melt into a steel ladle, and blowing magnesium powder for desulfurization; the desulfurized alloy melt is subjected to slagging-off, and manganese-silicon alloy molten iron is obtained; and the manganese-silicon alloy molten iron is poured into a mold for ingot casting, and a manganese-silicon alloy finished product is obtained after cooling. According to the method, the raw materials such as the manganese material, the silica, the coke and the dephosphorizing agent are crushed respectively and then mixed, briquetted and smelted, so that the dephosphorizing and desulfurizing effects can be improved, and sulfur in the alloy can be further removed by spraying magnesium powder outside the furnace for desulfurization, so that the quality of the manganese-silicon alloy is improved.

The invention relates to the technical field of antimony ingot casting, and discloses an antimony ingot casting device which comprises a rack, two annular chains are arranged in the rack, casting grooves are fixed between the two annular chains in an array mode, the inner sides of the two annular chains are meshed with a driving assembly, a casting cylinder is arranged above the left half portion of the rack, and the casting cylinder is arranged above the right half portion of the rack. Pouring heads are arranged at the front end of the pouring cylinder in an array mode, a transmission assembly is arranged between the front side of the pouring cylinder and the front side of the driving assembly, a liquid supplementing assembly is connected to the rear end of the pouring cylinder in an inserted mode, a slag scraping assembly is arranged at the top of the liquid supplementing assembly, and a reciprocating driving piece is rotationally connected to the right side of the pouring cylinder. The pouring cylinder reciprocates back and forth, and the hollow plate is driven to reciprocate back and forth under the connecting action of the lantern ring, the connecting rod and the sliding seat, so that the telescopic column slides anticlockwise along the annular groove, the scraper is attached to the top of the filter plate to slide, impurities intercepted at the top of the filter plate are scraped to the top of the deslagging hopper, and the aim of deslagging in advance is achieved.

The invention relates to the technical field of industrial waste treatment and silver nitrate preparation, in particular to a method for preparing high-purity silver nitrate from silver-containing waste. The method comprises the following steps: reducing the silver-containing waste by adopting a liquid phase reduction method, pickling to remove impurities, putting the silver-containing waste into a medium-frequency induction furnace, performing high-temperature smelting and ingot casting, performing electrolytic purification to obtain crude silver powder, and performing smelting and ingot casting on the crude silver powder to obtain a raw material national standard No.1 silver ingot for preparing silver nitrate; the method comprises the following steps: putting a national standard No.1 silver ingot and a nitric acid solution into a reaction kettle according to a certain proportion for dissolving silver, carrying out adsorption and impurity removal on a dissolved solution through ion exchange resin, carrying out adsorption and impurity removal on a primary filtrate through chelating type adsorption resin, and carrying out centrifugation, evaporative crystallization, drying and other processes on a secondary filtrate to obtain the high-purity silver nitrate. The method is easy to implement, the recovery rate of the silver-containing waste materials is high, the high-purity silver nitrate product can reach the premium-grade pure standard, and the technological process is environmentally friendly.

The present invention belongs to the technical field of aluminum alloy materials, and specifically discloses a method for preparing cast-rolled 8021 alloy aluminum foil. The method comprises the following steps: producing an 8021 alloy billet with a thickness of 6-8 mm by casting and rolling; directly homogenizing annealing the billet without cooling; rolling the billet through a cold rolling production process; and then rolling the billet through multiple passes such as trimming, secondary annealing, and foil rolling to obtain the finished product thickness. Compared with the traditional direct-chill ingot hot rolling process, the method omits multiple steps such as hot-rolled plate ingot casting, ingot sawing and milling, uniform annealing, and hot roughing mill opening and rolling with a large processing capacity, thereby saving energy and reducing carbon dioxide emissions. The finished product has performance equivalent to or even better than that of a hot-rolled product, thus meeting customer needs.

The invention relates to the technical field of lead-acid storage batteries, in particular to a preparation method of a rare earth alloy for a lead-acid storage battery, which comprises the following steps: smelting refined lead and rare earth elements in a crucible electric furnace; the heating rate of the crucible electric furnace at each collection moment is adjusted; after smelting is finished, rare earth alloy liquid is obtained, and an intermediate rare earth alloy is prepared through an ingot casting technology; the method comprises the following steps: melting refined lead in a lead melting pot, heating, sequentially adding silver and sodium, stirring, heating again, adding calcium-aluminum alloy, tin and a protective agent, smelting, adding the intermediate rare earth alloy, keeping a heating state, and stirring to obtain the positive grid rare earth alloy. The heating rate in the rare earth alloy smelting process is adjusted, the rare earth element utilization rate is increased, and rare earth alloy elements are evenly distributed.

The invention discloses a method for simultaneously optimizing the squareness and the remanence temperature coefficient of a 2: 17 type samarium-cobalt sintered magnet, and belongs to the technical field of rare earth permanent magnet material preparation. A component Sm < 1-x > RE < x > (CobalFeaCubZrc) z is designed, RE is one or more of Dy, Er, Gd, Tm and other heavy rare earth elements, and a, b, c and x meet the following relations: 0 < = x < = 0.6, 0.1 < = a < = 0.2, 0.06 < = b < = 0.12, 0.02 < = c < = 0.03, and 6.9 < = z < = 7.9. On the basis of a conventional smelting and ingot casting-isothermal annealing-powder preparation-oriented profiling-sintering-solid solution-aging process, an isothermal annealing process is added after smelting and ingot casting: the temperature is raised to 1190-1210 DEG C in a tubular furnace, isothermal annealing is performed for 5-20 hours, heavy rare earth elements are eliminated, and the influence of the stability of a 2: 17H phase on the component uniformity and magnetic performance of a magnet is improved; and substitution sites of heavy rare earth can be increased, and the residual magnetism temperature coefficient is optimized.

The invention is suitable for the technical field of alloy casting forming, and provides a cast ingot forming system and process for zinc alloy machining, the cast ingot forming system comprises a lower forming assembly, and an upper forming assembly is inserted and fixed to the top of the lower forming assembly; the upper forming assembly comprises an upper forming piece fixed to the top of the positioning piece in an inserted mode and a machining piece fixedly installed in the upper forming piece, and the lower forming piece is fixed to the interior of the positioning piece in an inserted mode; the system solves the problems that in the using process of an existing cast ingot forming system for zinc alloy machining, cast ingot forming zinc alloy needs to be subjected to cooling demolding operation, however, an extra power source needs to be added in the existing cooling demolding process, so that the cooling demolding process in the cast ingot forming process is achieved, the whole process is too tedious, and the production cost is high. And the later continuous ingot casting process is mostly affected, and the demolding efficiency and the continuous ingot casting forming efficiency in the whole process are reduced.

The invention discloses a preparation method of a TA11 alloy bar with high creep resistance. The preparation method comprises the following steps: S1, ingot casting preparation: performing VAR smelting on an alloy for three times to obtain a TA11 alloy ingot with components meeting requirements; s2, intermediate billet forging is conducted, specifically, the qualified cast ingot obtained in the S1 is subjected to two-heating-number forging at the temperature higher than the beta phase transformation point temperature, and an intermediate billet is obtained; s3, multi-heating-number circulating forging is conducted, specifically, the TA11 alloy intermediate blank obtained in the S2 is subjected to five-heating-number forging deformation within the range above and below the beta phase transformation point temperature, and an intermediate precision forging blank which is uniform in structure and high in alpha phase content is obtained; and S4, finish forging machining of a finished product bar is conducted, specifically, finish forging machining is conducted on the TA11 alloy intermediate finish forging blank obtained in the S3 at the temperature below the phase transformation point temperature, and the TA11 alloy bar with the high creep resistance is obtained. The TA11 alloy bar prepared through the method is high in alpha-phase content and stable in control, the structure is uniform and consistent, and the high-temperature creep resistance is stably controlled to be smaller than or equal to 0.15%.

The invention discloses a blast furnace molten iron full-automatic ingot casting control device and method, and relates to the technical field of molten iron ingot casting, the blast furnace molten iron full-automatic ingot casting control device comprises a base, an adjusting column is movably installed on the side face of the base, meanwhile, a supporting plate is fixedly installed at the upper end of the adjusting column, and a cleaning assembly is clamped to the lower end of the supporting plate; the inner wall of the cast ingot mold is cleaned through the cleaning assembly; according to the full-automatic ingot casting control device and method for the blast furnace molten iron, when the push rod moves, the convex column arranged at the end of the push rod is synchronously driven to move, due to the fact that the outer surface of the convex column is slidably connected with the inner wall of the threaded groove, when the convex column moves, the threaded groove is matched to drive the cleaning pipe to rotate, and therefore the inner wall of the mold groove is cleaned. And meanwhile, a brush and other parts with the cleaning function are fixedly installed at the end of the cleaning pipe, the inner wall of the mold groove is cleaned in cooperation with a scraper, and therefore follow-up machining is guaranteed.

The invention discloses a TA4-xB alloy and a preparation method thereof, the content of B in the alloy is 0.01-0.5 wt%, and the balance is Ti and other impurities. The preparation method comprises the following steps: dividing sponge titanium and TiB2 wrapped by pure titanium foil into three equal parts, smelting in three times by adopting a vacuum non-consumable arc smelting furnace to obtain three button ingots, then putting the three button ingots into the smelting furnace for secondary smelting to obtain an alloy ingot, and finally overturning and repeatedly smelting the alloy ingot obtained by cooling after secondary smelting for three times. A TA4-xB alloy cast ingot with uniform components is obtained through smelting, the cast ingot is machined through a cast ingot machine and subjected to forging-free direct rolling to form a plate, the rolling temperature is 940 DEG C, the finish rolling temperature is 880 DEG C, five passes of rolling are conducted, the rolling deformation of the first pass is 50% or above, and the accumulative deformation is 90%. According to the method, a proper amount of B element is added, a TiB phase is generated in the TA4 titanium material, grains are refined, and then the mechanical property of the TA4 titanium material is improved through multi-pass large-deformation rolling. The method is low in process cost, short in flow, good in material comprehensive performance and free of large-scale equipment transformation.

The invention discloses a short-process preparation method of a Cu-Ag-Be-Mg composite strip for a photodynode, and relates to a preparation method of a Cu-Ag-Be-Mg composite strip for a photodynode. The invention aims to solve the problems that the traditional strip preparation process is long, the energy consumption is high, the production efficiency is low, and a composite film layer prepared by sputtering, deposition and other methods is low in interface bonding force, short in service life and the like. The method comprises the following steps: 1, smelting; 2, semi-continuous casting; 3, homogenization treatment; 4, hot die forging; 5, heat treatment; 6, cold rolling; 7, surface treatment; 8, finish rolling; and 9, rolling. The method is different from a traditional large ingot casting and large rolling deformation equal-length process technology, after semi-continuous casting and homogenizing heat treatment are adopted, hot die forging is directly carried out, the thin-wall cylindrical part is obtained, finish rolling deformation is directly carried out after unfolding, the preparation process is shortened, and the production efficiency is improved. According to the preparation method, the Cu-Ag-Be-Mg composite strip for the photomultiplier can be obtained.

The utility model belongs to the technical field of aluminum alloy ingot casting devices, and particularly relates to an aluminum alloy ingot casting device which comprises casting equipment, a flowing groove penetrating through the casting equipment is formed in one side of the casting equipment, a feeding port is formed in one side of the flowing groove, and a discharging port is formed in the other side of the flowing groove. A plurality of mold boxes are placed in the flowing groove, a liquid discharging pipe is fixedly installed in the casting equipment, and a base is fixedly installed on one side of the casting equipment; the first electric push rod drives the containing box to move towards the mold box, then the second electric push rod in the cavity is started, the second electric push rod drives the sliding block, the connecting rod and the scraping plate to move downwards, and the bottom end of the scraping plate enters the mold box to conduct oxide skin scraping work.

The invention discloses an automatic control method and device for a furnace plug of an aluminum ingot casting holding furnace, the device comprises a holding furnace (11), the holding furnace (11) is connected with an annular distributor through a chute (16), and the annular distributor is connected with a casting mould (15), and the automatic control method is characterized in that after production is started, a furnace mouth of the holding furnace (11) is closed firstly, and after the temperature and the liquid level of molten aluminum in the holding furnace (11) reach the standard, the furnace mouth of the holding furnace (11) is opened; molten aluminum flows into a chute (16), passes through an annular distributor and then enters a casting mold (15); when molten aluminum flows into the annular distributor, the conveying speed of the casting mould (15) is controlled by detecting the liquid level of the molten aluminum, and accurate casting of aluminum ingots is achieved. The opening degree of the furnace plug and the conveying speed of the aluminum ingot casting mold can be adjusted, so that the flow of molten aluminum is stable, and the quality of cast aluminum ingots reaches the standard; in addition, the casting mold conveying speed can be adjusted in time according to liquid level fluctuation, and the situation that molten aluminum overflows or is cut off is avoided.

The invention relates to the field of aluminum alloy ingot casting, in particular to an aluminum alloy ingot casting device facilitating slagging-off. The existing aluminum alloy ingot casting device has the defects that the existing aluminum alloy ingot casting device depends on a worker to fish dross in aluminum alloy liquid by using a dross-off spoon or a dross-off rake, the casting efficiency is low, the dross in the aluminum alloy liquid is difficult to fully fish out, and the quality of subsequently cast aluminum alloy ingots is poorer. An aluminum alloy ingot casting device facilitating slagging-off comprises a bottom frame and the like. The bottom frame is fixedly connected with a frame body, the frame body is rotationally connected with two first transmission assemblies, and the two first transmission assemblies are symmetrically arranged. The dross on the surface of the aluminum alloy liquid in the casting basin is scraped through the dross skimming plate and the two dross scraping plates together, the aluminum alloy ingot casting efficiency is improved, meanwhile, the dross in the aluminum alloy liquid can be more sufficiently scraped, and therefore the quality of the cast aluminum alloy ingot is better.

The invention relates to a crack defect detection method, system, equipment and medium in an alloy slab ingot casting process, and the method comprises the following steps: synchronously collecting acoustic emission signals through at least two acoustic emission sensor arrays arranged along the width direction of a slab ingot; adaptive segmentation processing is carried out on the acoustic emission signals, and comprehensive characteristic parameters are extracted through wavelet packet decomposition and Hilbert transform collaborative analysis; processing the comprehensive characteristic parameters based on a pre-trained multi-modal deep forest model to obtain crack category information; and configuring a propagation path weight coefficient corresponding to the category for the identified crack feature information, and outputting crack defect characterization information by combining anisotropic correction of sound wave propagation in the slab ingot according to a time difference and a spatial geometrical relationship when an acoustic emission signal reaches each sensor array. Therefore, through a multi-dimensional perception and intelligent analysis cooperation mechanism, all-directional monitoring and accurate characterization of crack defects in the slab ingot solidification process are achieved.

The utility model belongs to the technical field of aluminum alloy ingot casting, and particularly relates to an aluminum alloy ingot rapid cooling device which comprises a base and a cooling assembly arranged on the surface of the base. In order to accelerate cooling and heat dissipation of water in the cooling water tank, the water pumping tank and the water drainage tank are arranged on the two sides of the cooling water tank, the temperature in the water body is conducted to the surface of the circulating cold water pipe for heat dissipation treatment, cooling in the water body is accelerated, it is guaranteed that the water body is at the low temperature when the aluminum alloy ingot is cooled, and the service life of the aluminum alloy ingot is prolonged. In cooperation with an atomization assembly, a water supply pipe is installed at an air opening of a cold air fan, an atomization spray head is installed on the surface of the water supply pipe, a suction pump a is started to atomize water, water mist is blown to the surface of a circulating cold water pipe under blowing of the cold air fan, and then the aluminum alloy ingot is rapidly cooled; heat dissipation of the surface of the circulating cold water pipe is accelerated, the water body can be rapidly cooled, and the cooling efficiency of the water body is further improved.

The distribution bag comprises a glass fiber net which is provided with an opening in the top and is arranged in a rectangular box shape, the outer side of the glass fiber net is wrapped and covered with glass fiber cloth, side flow holes are correspondingly formed in the two sides of the glass fiber cloth, and the side flow holes are communicated with the glass fiber cloth. A sliding groove communicated with the side flow holes is formed in the top of the glass fiber cloth, an adjusting plate is arranged in the sliding groove in a sliding mode, and two bottom flow holes which are symmetrically formed and can adjust the effective size are formed in the bottom of the glass fiber cloth. According to the distribution bag, the effective sizes of the side flow holes and the bottom flow holes can be adjusted or blocked, the speed of molten aluminum flowing to a small surface can be effectively reduced, and the problem that the flow speed of 8-series alloy melt is too high is solved, so that the possibility of aluminum leakage of the small surface and corners is reduced, casting of cast ingots is facilitated, and the distribution bag is more suitable for production of high-iron aluminum alloy slab ingots.

The ingot casting production line comprises a transferring and putting system, a material melting system, a chain type ingot casting system, a demolding system, a collecting system and a control system. The transferring and putting system is used for transferring the material ton bags, breaking the ton bags and putting the materials into the material melting system; the material melting system is used for receiving the materials, melting the materials to form molten materials and supplying the molten materials to the chain type ingot casting system; the chain type ingot casting system comprises a chain wheel and chain circulating motion mechanism and a plurality of single ingot molds, and the chain type ingot casting system is used for receiving molten materials in the corresponding single ingot molds and cooling the molten materials to form single cast ingots; the demolding system is used for demolding the single cast ingot formed by cooling in the single-ingot mold and falling the single cast ingot out of the corresponding single-ingot mold; the collecting system is used for collecting the single cast ingot falling from the single ingot mold; the control system is in communication connection with the conveying and putting system, the material melting system, the chain type ingot casting system and the demolding system and controls operation of the conveying and putting system, the material melting system, the chain type ingot casting system and the demolding system.

The invention relates to multi-workpiece production scheduling and scheduling optimization in the field of industrial production, in particular to an order delivery time workshop task scheduling method based on an improved sled dog optimization algorithm, which comprises the following steps: constructing a multi-target scheduling model of an aluminum ingot casting workshop; based on the multi-target scheduling model, improving initialization of a sled dog algorithm to obtain an initial population; performing sled dog group iteration updating according to the initial population by using a grey wolf algorithm to obtain an optimized population; carrying out discretization coding on the optimized population, and solving a scheduling scheme to obtain a scheduling scheme candidate solution; retaining an optimal scheduling scheme candidate solution as a final scheduling scheme through multi-round iteration and screening; and performing task scheduling of the aluminum ingot casting workshop based on the final scheduling scheme. According to the method, the total production cost is reduced, the idle and switching frequency of equipment is reduced, the default rate of the order delivery time can be strictly controlled, and the overall production efficiency of a workshop is remarkably improved.

The invention discloses a preparation method of a TC4 titanium alloy cast ingot. The preparation method comprises the following steps: determining a used residual waste component range according to target components of the TC4 titanium alloy cast ingot; the residual waste materials and the aluminum bars are evenly arranged in a feeding groove of the electron beam cold bed furnace; primary smelting is conducted through an electron beam cold bed furnace, and a primary cast ingot is prepared; and the primary cast ingot is smelted through a vacuum consumable electric arc furnace, and the TC4 titanium alloy cast ingot is prepared. Before material distribution, the loss amount in Al element smelting is calculated, and supplementation is carried out during material distribution, so that excessive loss of the Al element in EB smelting is made up, and the ingot casting quality is improved; the aluminum bars are uniformly distributed in the feeding groove, so that the burning loss of the aluminum element is balanced, the aluminum element in the cast ingot is uniformly distributed, and the phenomenon of macrosegregation is improved.

The invention discloses a high-strength corrosion-resistant aluminum alloy brazing plate for a power battery water-cooling plate and a preparation method of the high-strength corrosion-resistant aluminum alloy brazing plate, and aims to solve the problem that an existing water-cooling plate made of 3003 aluminum alloy is limited by strength and corrosion resistance. And the use requirements of users are difficult to meet. The high-strength corrosion-resistant aluminum alloy brazing plate is made of a composite plate, the composite plate is formed by rolling and compounding a core material layer and a brazing layer, and the core material layer is composed of Si, Fe, Cu, M, Zn, Ti and Al. The preparation process comprises the steps of fusion casting, homogenization treatment, ingot casting treatment, brazing layer preparation, material covering, preheating before rolling, hot rolling, cold rolling, finished product annealing, finishing and shearing. The high-strength corrosion-resistant aluminum alloy brazing plate is high in strength, good in ductility, not prone to cracking after being formed, high in strength after brazing and excellent in corrosion resistance. The water-cooling plate is applied to the field of power battery water-cooling plates.

The invention provides a low-sulfur manganese-silicon alloy and a production method thereof.The method comprises the steps that silica, coke and manganese ore are crushed and then mixed with lime, and smelting raw materials are obtained; a closed electric furnace is filled with smelting raw materials for smelting, and alloy melt is obtained; the alloy melt is transferred into a ladle, a desulfurizing agent is added for the desulfurization process, and manganese-silicon alloy molten iron is obtained; and the manganese-silicon alloy molten iron is poured into a mold for ingot casting, and a manganese-silicon alloy finished product is obtained after cooling. According to the method, the method capable of effectively reducing the sulfur content in the manganese-silicon alloy is provided through the steps of raw material crushing and mixing, in-furnace power transmission refining, out-of-furnace desulfurization, casting molding and the like, the low-sulfur manganese-silicon alloy is produced, and therefore control over the sulfur element content in a steelmaking product is facilitated.

The utility model relates to the technical field of pig casting machines, in particular to a disc pig casting machine system, and aims to solve the problems of more manual operation, higher potential safety hazard, high labor intensity of workers, lower production efficiency and unstable production quality in the production process of the conventional disc pig casting machine system. In order to achieve the purpose, the disc pig casting machine system comprises a disc pig casting machine body, a lifting lug inserting device, an automatic demolding device and a plurality of molds arranged on the disc pig casting machine body, and further comprises at least one casting station, a lifting lug inserting station, a cooling station and a demolding station. According to the utility model, the lifting lug is inserted into the molten metal by the lifting lug inserting device instead of manual work, and the mold can fall off from the metal ingot by the automatic demolding device instead of manual work, so that the manual work participating in the production of the metal ingot can be reduced, the potential safety hazard and the labor intensity of workers are reduced, and meanwhile, the production efficiency can be improved and the production quality can be stabilized.

The utility model discloses a full-process intelligent metal ingot casting system, which relates to the technical field of non-ferrous metallurgical equipment and comprises a linear casting machine. A scooping spoon is arranged at the hand part of the casting robot; the scum removing robot is arranged on one side of the linear casting machine, and a scum removing plate is mounted on the hand of the scum removing robot; the input end of the chain conveyor corresponds to the lower part of the output end of the linear casting machine; the input end of the chain scraper conveyor corresponds to the output end of the chain conveyor; a laser coding machine, an appearance quality detection device, a trimming robot and a stacking robot are sequentially arranged on the side of the chain conveyor in the conveying direction. The palletizing robot corresponds to the output end of the chain conveyor; a full-automatic packaging machine, an automatic weighing device and an automatic labeling device are sequentially arranged on the chain scraper conveyor in the conveying direction; and the controller controls the operation of the casting system. According to the utility model, the ingot casting precision and the product quality can be improved, and unattended operation and automation and intelligentization of the whole process in the ingot casting process are realized.

The invention discloses a preparation method of a martensitic stainless steel medium plate. The stainless steel comprises the following chemical elements in percentage: 0.21-0.28% of C; 0.15% to 0.30% of Si; 0.50% to 0.80% of Mn; less than or equal to 0.020% of P; s < = 0.005%; cr: 13.00% to 14.00%; 0.20% to 0.30% of Mo; 0.60% to 0.80% of Ni; the Cu accounts for 0.20%-0.25%, the V accounts for 0.10%-0.20%, and the Nb accounts for 0.03%-0.08%; 0.080% to 0.12% of N; and the balance of Fe and inevitable impurities. The preparation method comprises the steps that molten steel is smelted, steel ingot pouring is conducted, the steel ingot cast into an electrode blank is subjected to double-slag-system electroslag remelting under the protective atmosphere, and a slag system for the first time of electroslag remelting comprises a CaF2-Al2O3-CaO-MgO quaternary slag system with the proportion being 40%: 25%: 30%: 5%; a slag system for secondary electroslag remelting comprises a five-membered slag system of CaF2-Al2O3-CaO-MgO-SiO2 with the proportion of 40%: 30%: 23%: 5%: 2%, and the processes of forging cogging, blank hot rolling, cooling, low-temperature normalizing and spheroidizing annealing heat treatment are carried out. The martensitic stainless steel prepared through the method has the characteristics of being good in corrosion resistance, high in heat treatment hardness, uniform in structure and stable in performance.

The invention provides a preparation method of a titanium alloy plate with high structure uniformity. The preparation method comprises the following steps that S1, a plate blank is designed; s2, calculating raw materials required by the cast ingot according to plate blank parameters, mixing the raw materials, pressing the mixed raw materials into a plurality of electrode blocks, welding the electrode blocks into a whole-circle electrode, and finally smelting to prepare the titanium alloy cast ingot; s3, the titanium alloy cast ingot is forged, and a plate blank is obtained; s4, the plate blank is subjected to primary fire rolling, and a semi-finished plate is obtained; s5, the semi-finished plate is subjected to blanking and crack polishing; s6, the semi-finished plate is subjected to secondary heating rolling; and S7, the semi-finished plate is subjected to annealing, blanking and surface treatment, and a finished plate is obtained. According to the method, a multi-time reversing strategy of first-fire transverse broadening, reversing longitudinal rolling, blanking reversing, second-fire transverse broadening to the target width and reversing rolling to the target thickness is adopted, and a uniform plate structure is obtained through multi-time reversing rolling.

The invention relates to the technical field of rare earth permanent magnet materials, in particular to a preparation process of a core-shell structure enhanced neodymium iron boron magnet. Through a multi-component composite formula of high-abundance rare earth and a small amount of heavy rare earth and in combination with a magnesium interface catalytic pretreatment and grain boundary diffusion technology, a Dy-rich shell layer is formed on the surface of a main phase grain, a core-shell structure is constructed, and the coercivity and the high-temperature stability are remarkably improved. An integrated continuous production technology is adopted in the preparation process and comprises the steps of vacuum melting, continuous ingot casting, jet milling, magnetic field forming and continuous sintering, laser-electrochemical integrated machining is integrated, and high-precision cutting and surface corrosion prevention are achieved. The invention further relates to special equipment, such as a multi-zone intelligent temperature control vacuum sintering furnace and double-shaft stirring-composite magnetic field powder equipment, so that the temperature uniformity and the powder orientation degree are ensured. According to the process, heavy rare earth dependence is reduced, the coercive force reaches 24 kOe or above, the high-temperature magnetic performance attenuation is smaller than or equal to 5%, the production cost is reduced, the efficiency is improved, and the process is suitable for the fields of motors, electronics and the like.

The present application relates to a kind of rack steel layered casting composite flux and its preparation, method for using, the component and content of composite flux are as follows: high-purity iron powder: 40%~50%, high-purity rare earth powder: 20%~30%, analytical pure sodium pyrovanadate: 20%~40%.Using layered casting process of composite flux with rack steel, the macrosegregation and shrinkage cavity defects of large rack steel ingot can be significantly improved, which provides a simple, feasible and effective way to improve the composition homogenization degree of ingot, helps to improve the overall quality of rack steel ingot, also shortens the production cycle and improves the production efficiency, thereby improves the production capacity of large rack steel ingot, reduces the production energy consumption and production cost;The present application has important significance for breaking through the bottleneck of high homogenization large rack steel ingot manufacturing, laying the new technical theoretical foundation and industrialization application of large rack steel ingot casting, and improving the manufacturing technology level of key components of large equipment in China.

The silver ingot casting mold comprises a cast iron body, a first graphite plate and a second graphite plate, the cast iron body is of a groove-shaped structure with an opening in the top, the cast iron body is provided with a first inner wall and a second inner wall, the first inner wall and the second inner wall are oppositely arranged, the first inner wall is provided with a first vertical guide groove, and the second inner wall is provided with a second vertical guide groove. The first inner wall is provided with a first vertical guide groove, the second inner wall is provided with a second vertical guide groove, the first graphite plate is arranged in the first vertical guide groove in a vertically sliding mode, the second graphite plate is arranged in the second vertical guide groove in a vertically sliding mode, and a first embossment pattern is arranged on the face, facing the second graphite plate, of the first graphite plate. A second embossment pattern is arranged on the face, facing the first graphite plate, of the second graphite plate, and a cooling channel is formed in the cast iron body. The technical scheme is used for solving the problem that embossment pattern design is difficult to achieve in an existing integrated silver ingot casting mold.