This paper introduces the common classification of the melting&holding furnace, and some auxiliary facilities closely matched with the melting&holding furnace. By introducing some new combustion technology in the melting&holding furnace, the development direction of the melting&holding furnace is introduced. This paper describes the related technology of the furnace systematically, and points out that the furnace development direction of the furnace is reducing burning loss, saving energy, safety and environmental protection and intelligence.

This paper expounds the harm and potential value of aluminum ash, introduces the comprehensive utilization technology of aluminum ash resources, and analyzes the application prospect and existing problems of aluminum ash.

This paper reviews the development history of Chinese aluminum industry, classifies and summarizes the waste aluminum alloy, analyzes the social quantity of domestic waste aluminum alloy resources from multiple angles, and predicts the increment of waste aluminum alloy (recycled aluminum) resources in the next ten years (2026-2035). The problems existing in the development of domestic waste aluminum alloy recycling industry and how to achieve benign development in the future are put forward.

In this paper, titanium aluminum composite plate made by warm rolling process is selected, and then annealed at different times. Optical microscope, scanning electron microscope and tensile property test are used to study the influence of annealing time on the tensile property of titanium aluminum composite plate. The results show that the grain boundary of the conded layer of the processed titanium-aluminum composite plate is relatively straight and complete, and no obvious diffusion phenomenon is observed. The pure titanium layer presents a mixed structure of equiaxed crsytal and twin crystal, while the pure aluminum layer has a completely broken grain and elongated ribbon structure. Compared with the processed state, it is found that the plasticity of the composite plate is significantly improved after annealing, but the strength is somewhat reduced. The tensile fracture of the composite plate is mainly composed of dimple, which has obvious ductile fracture characteristics. According to the analysis, this is caused by the removal of residual stress caused by annealing during the plastic processing of the composite plate.

In order to further investigate the melt flow and solidification heat transfer law in the molten pool during casting and rolling, reveal the generation mechanism of cracks and other defects of cast-rolled 6061 aluminum alloy, and provide reliable theoretical guidance for improving the cast-rolled 6061 sheet, a coupling model of casting roll-cooling water-molten pool was established by using three-dimensional modeling software SolidWorks. The heat transfer and cooling between molten pool, cooling water and casting roll are described, and the heat transfer equations and boundary conditions required for simulating each physical site are determined. The periodic distribution of temperature field and flow field in molten pool is reflected in the form of cloud diagram and flow diagram. The influence principle of casting billet quality is discussed, and the accuracy of calculation is proved by experiments. The results show that the surface eddy current makes the height of Kiss point different in the direction of the width of the molten pool, the exit temperature of the edge is 239.6 ℃, and the exit temperature of the central part is 301 ℃. The center and edge Kiss points are low, and these parts are prone to cracks. The maximum speed of the flow line at the rod sleeve is 16.94 m/s, and due to the difference in the inflow Angle of the cooling water, under the rotation of the casting roll, the flow rate of the cooling water changes alternately in the direction of the circumference of the casting roll according to 1/4 cycle, and the cooling temperature difference between the two adjacent cycles is about 30 ℃.

In this paper, the effects of heat treatment on the superelasticity and specific energy absorption of TiNi51/Ta composite filament are studied by differential scanning calorimetry and tensile testing. The results show that the superelastic upper and lower platform stress difference of TiNi51/Ta SMA composite wire is obviously greater than that of TiNi51 alloy wire is obviously better. With the increase of heat treatment temperature, the superelastic stress on the upper and lower platform of composite wire gradually decreased, and the lower platform stress decreased more significantly. The specific energy absorption of the composite wire increased, and the specific energy absorption of the composite wire during online heat treatment at 500 ℃/12 s is 3.18 J/g. The superelasticity and specific energy absorption of the composite wire are the same as that of online heat treatment when the temperature remained constant for 15 min, but the heat treatment time is prolonged and the specific energy absorption is slightly reduced. The specific energy absorption of 500 ℃/15 min heat treatment is 3.04 J/g.

In this paper, the influence factors of dynamic mechanical behavior of AZ31 magnesium alloy under high speed impact loading are studied. The yield strength and peak stress of AZ31 magnesium alloy decreased with increasing temperature. The mechanical behavior of AZ31 magnesium alloy under high speed impact compression showed anisotropy, and the fracture of AZ31 magnesium alloy showed mixed tough-brittle characteristics. The combination of numerical simulation and experiment based on Johnson-Cook.

Taking 6005A-T6 aluminum alloy as the research object, the laser welding technology of lap joint is studied in this paper. The research contents include increasing the laser power with constant wire feed speed, laser power unchanged and improve wire feed speed. The results show that the surface of the 2 mm 6005A-T6 aluminum alloy lap joint is well formed after laser welding, but the welding blots appear on the back when the laser power reaches 5 000w. When the wire feeding speed is unchanged and the laser power is increased, the weld metal is easier to spread, the fusion performance is increased, and the weld surface texture becomes deep and clear. At the same time, with the increase of laser power, mechanical properties and mechanical properties increase. When the laser power is unchanged and the wire feeding speed is increased, the surface forming quality decreases, the joint penetration depth and mechanical properties increase first and then decrease. The mechanical properties of the fracture specimens at the fusion line of the upper plate are higher than those at the fusion line of the lower plate. The results of microstructure testing show that the laser welding seam of the lap joint has obvious columnar crystal structure near the fusion line, and the center of the weld is equiaxed grain.

According to the structural characteristics of titanium alloy brush box and technical difficulties in the casting process, this paper explores a high strength and low stress titanium alloy brush box casting process on the basis of analyzing the causes of defects in titanium alloy brush box casting.

In this paper, NH4HF2 is used as pickling agent and H2TiF6/H2ZrF6 as passivation agent, the pickling/ TiZr passivation treatment process of 5182 aluminum alloy surface is analyzed through orthogonal test and the content of Ti and Zr elements on the substrate surface. The results show that the optimum parameters of pickling passivation process are as follows: pickling F-concentration is 400ppm, passivation solution pH is 4.1, treatment time is 4.2 s, conductivity is 2 300 μs/cm; the contents of Ti and Zr are 5.48 mg/m2 and 4.79 mg/m2, respectively.

This paper puts forward personal opinions on the development process, equipment configuration, main functions, production application results and scheme comparison of 2800 mm six-roll aluminum strip cold rolling mill, which provides reference for the equipment selection and the subsequent improvement of domestic equipment.

This paper introduces in detail a typical tower phenomenon in cold rolling aluminum strip. After systematic analysis and exclusion of related factors, the root cause of tower shape phenomenon is finally found. After taking measures to the root causes of the main problems, the tower shape problem is finally solved and the normal production state of the equipment is guaranteed.

With EMG controller SPC16 technology upgrade, the communication between the correction system and Siemens S7-400 PLC is realized, which changes the traditional single correction mode, and realizes the correction adjustment of different speed segments in production by sending different gain values, and achieves good results. The digital production management is realized by using data acquisition software.

Aiming at the problems such as low transportation efficiency, difficult material tracking, chaotic production scheduling and unstable operation of logistics equipment, the paper puts forward optimization and improvement measures, which can provide reference for the design and application of related equipment in the same industry.

In the process of secondary aluminum ash wet extraction and recovery of aluminum resources, the active aluminum compound reacts with water to produce hydrogen, methane, ammonia and other combustible mixed gases. The ammonia in the mixed gas is absorbed by frozen water to reduce the corrosion effect of the ammonia in the combustible gas on the burner. Part of the liquid is extracted from the ammonia gas absorber kettle, and then recycled back to the absorber to absorb the mixed gas after cooling. The influence of different circulation amount on the deammonification effect of the mixed gas is analyzed. The results show that when the mass fraction of ammonia in raw gas is 53.09% and the flow rate of circulation liquid is 6kg/m3 of raw gas, the mass concentration of ammonia in combustible gas can be reduced to 4.38 mg/L, which meets the requirements of the inlet gas of burilers. The mass fraction of recovered ammonia water is 20.46%, which meets the HG/T 5353-2018 industrial ammonia water standard. The use of chilled water to recover ammonia from the combustible gas in the wet extraction process of secondary aluminum ash can reduce the harm of harmful components in the combustible gas to the burner, and recover the ammonia gas to produce industrial ammonia water, which can produce certain economic benefits.

In order to solve the problem of environmental pollution caused by a large amount of flue gas in cold rolling process, the physical models of annular suction hood and slit hood for oil mist trapping in aluminum rolling process are established. The numerical calculation model of the flow field of two kinds of exhaust hoods is established by means of computational fluid dynamics method, and the characteristic wind speed near the mouth of the two kinds of exhaust hoods and the trapping effect of pollutants are compared. The results show that the trap performance of annular suction hood is better than that of slit hood.