Magnesium alloy

Magnesium alloy products based on magnesium alloy by adding other elements as the base alloy. Its characteristics are: density (1.8g/cm3 magnesium alloy or so), high strength, elastic modulus, good consumption shock, to withstand a large impact load capacity than aluminum, organic and alkali resistance and good corrosion. Major alloying elements of aluminum, zinc, manganese, cerium, zirconium or thorium and a small cadmium. Is currently the most widely used magnesium alloy, followed by magnesium and magnesium alloy zinc manganese zirconium alloys. Mainly used in aviation, aerospace, transportation, chemical, rocket and other industrial sectors. Utility is the lightest metal in the metal, magnesium aluminum proportion is about 2 / 3 iron 1 / 4. It is the lightest practical metal in the metal, high strength, high rigidity.
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characteristics of magnesium alloy magnesium alloy used in aerospace applications in the application of digital SLR cameras set of patented technology of magnesium alloy corrosion of magnesium alloy processing method of chemical conversion coating anodized metal laser for other surface treatment of magnesium alloy production measures of fire prevention and fighting of the cutting process of magnesium alloy fire hazard during metal cutting temperature factor affect the cutting process of magnesium alloy cutting debris fire prevention Fire fighting
magnesium alloy
the processing characteristics of magnesium alloys and corrosion and mechanical properties of the process has many features: light weight, rigid, and has some corrosion resistance and dimensional stability, impact resistance, abrasion resistance, attenuation performance and ease of recycling; also have high thermal and electrical conductivity, non-magnetic, shielding characteristics of good and non-toxic. Applications: wide range of magnesium alloys for use in portable devices and the automotive industry to achieve the purpose of lightweight magnesium alloy castings
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. Although the proportion of magnesium alloy weight than plastic, but the strength per unit weight and elastic rate higher than plastic, so the strength of parts in the same circumstances, the magnesium alloy parts can do better than the thin and light plastic. In addition, the specific strength of magnesium alloys is also higher than the aluminum and iron, therefore, does not reduce the intensity components, aluminum or iron components reduce the weight. Magnesium alloy relative strength (strength and mass ratio) the highest. Specific stiffness (stiffness and mass ratio) close to the aluminum and steel, much higher than the engineering plastics. In the elastic range, magnesium alloy under impact load, the absorbed energy than half of large aluminum alloy, so the magnesium alloy has better seismic noise reduction performance. Melting point of magnesium alloys with low melting point than aluminum, die casting performance. Tensile strength of magnesium alloys and aluminum alloy castings rather, generally up to 250MPA, up to 600 Mpa. Yield strength, elongation and aluminum is also little difference. Magnesium is also a good corrosion resistance, electromagnetic shielding, radiation protection performance can be achieved 100%
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recycling. Higher stability of magnesium alloy die casting parts casting line processing size and high precision, high-precision machining can be carried out. Die-casting magnesium alloy has good formability, die casting, the minimum wall thickness up to 0.5mm. Adapt to various types of die casting manufacturing cars. Magnesium alloys used in aerospace applications of magnesium alloys are aircraft, spacecraft and missiles used in the manufacturing industry the lightest metal structure material. Lighter weight than aluminum, magnesium, accounting for 1.8, low intensity, only 200 to 300 MPa (20 to 30 kg / mm 2), mainly for the manufacture of low-load-bearing parts.
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magnesium alloys in wet air oxidation and corrosion easily, so parts before use, the surface need to chemically treated or painted. Germany's first production aircraft to use in magnesium aluminum alloy. Magnesium alloys have high vibration capability,onitsuka tiger mexico mid runner hi top boots green, when the impact load can be absorbed by the larger energy, as well as good heat-absorbing properties, which is to create an ideal material for aircraft wheels. Magnesium alloy in gasoline, kerosene and lubricating oil is very stable, suitable for manufacturing engine gear casing, pump and tubing, because of the rotating and reciprocating inertia force generated was used to make small rocker, flaps, doors and control surfaces and other moving parts. Civilian aircraft and military aircraft, especially bombers extensive use of magnesium alloy products. For example, B-52 bomber's body parts on the use of magnesium alloy sheet 635 kg, 90 kg of extrusion, casting more than 200 kg. Magnesium is also used in some missiles and satellite components, such as the Chinese Rich in rare earth resources in China, was developed 70 years plus yttrium magnesium alloy, magnesium alloy castings to improve
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room temperature strength to 300 ° C under the long-term use, has been in the aerospace industry application. At present, the magnesium alloy parts in automotive applications can be grouped into two categories. (1) housing category. Such as the clutch housing, valve cover, instrument panel, gear box, crankcase, engine front cover, cylinder head, air conditioners shell. (2) Bracket. If the steering wheel, steering brackets, brake brackets, seat frame, mirror frame, distribution frame and so on. According to the study, vehicle fuel used in 60% of consumption in the vehicle weight, vehicle weight for each to reduce 10% of its fuel efficiency can be increased more than 5%; vehicle weight decreasing by 100 kg, per hundred kilometers can reduce the 0.7 L or so, each 1 L of fuel saving can reduce the CO2 emissions of 2.5 g, annual emissions by 30% or more. Therefore, to reduce vehicle weight and energy impact on the environment is very large, lightweight car into an inevitable trend. Mobile phone, notebook computer, LCD screen size increases every year, in the framework of their branches and back support the use of a magnesium alloy shell. Although less than the thermal conductivity of magnesium alloy, however, tens of times higher than the plastic, therefore, magnesium alloy is used in electrical products, it can be effectively distributed to the outside of the heat inside. Internally generated heat in the computer and projector and other parts of the shell and the use of magnesium alloy heat. TV on the use of magnesium alloy shell can be done without cooling holes. Electromagnetic shielding: the electromagnetic shielding properties of magnesium alloy than in the plastic film on the plating shielding effect, therefore, the use of magnesium alloys can eliminate electromagnetic wave shielding film plating process. In reading the hard drive devices near the source of vibration on the use of magnesium alloy parts. If the fan blades on the use of magnesium alloy, can reduce the vibration of sound to reach the low show. In addition, in order to be in the car after the crash impact and improve the absorption of light weight, the steering wheel and seats on the use of magnesium alloys. AZ91D alloy application name features high strength and corrosion resistance, electrical products, such as shell elongation and impact resistance AM60B largest car on the steering wheel and seats, etc. AM50A elongation and impact forces on the steering wheel and a large car seat good creep resistance and other AS41B car gear box on the machining performance such as: magnesium alloy than other metal cutting resistance, mechanical processing, processing speed can be faster. Table: metal cutting resistance (cutting resistance of magnesium alloys is 1) cutting resistance of metal were aluminum magnesium alloy 1.0 3.5 1.8 Brass 2.3 iron and good resistance to depression: comparison with other metal alloy resistance to deformation force, depression caused by the collision is less than other metals. The absorption of vibration and shock: the magnesium alloy on the absorption of vibration energy performance, the use of components in the drive and transmission can be reduced vibration. In addition, the impact energy absorption performance, better than aluminum magnesium alloy, the elongation by the attacks, can absorb impact energy without causing fracture. Regeneration: magnesium alloy and plastic different, it can simply use of renewable and does not reduce its mechanical properties and the plastic is difficult to reduce its mechanical properties without use of renewable. Compared with other metal alloy, low melting point, specific heat is small, melting in the renewable energy is consumed when manufacturing new materials energy consumption of 4%. Table: Comparison of the physical properties of various materials, materials were density (g/cm3) Melting Point (℃) thermal conductivity (W / Mk) Tensile strength (MPa) yield point (MPa) Elongation (%) Young's modulus than the strength (GPa) magnesium alloy (Thixoforming) AZ91 1.82 596 72 280 160 8 154 45 AM60 1.79 615 62 270 140 15 151 45 aluminum alloy (die casting) 380 2.70 595 100,315,160,311,771 786 1520 Carbon Steel Steel 425,174,002,266,200 plastic ABS 1.03 90 (Tg) 0.2 35 * 40 34 2.1 PC 1.23 160 (Tg) 0.2 104 * 3 85 6.7 types of magnesium alloys in the application of digital SLR cameras on the low density of magnesium alloy, is stronger than high, with some corrosion resistance, commonly used to SLR camera's frame. General and high-end professional digital SLR cameras have adopted a framework of magnesium alloy, so durable, feel good. Such as the Canon 1D series, 5D Series, 7D, and 10D-50D, Nikon's D3 Series, D700, Dx00 series and the latest D7000, Pentax K-7 and K-5 are all magnesium alloy body. Magnesium alloy body with a digital SLR camera is not only a symbol of quasi-professional-level professional, also has a high price. Divided by molding method and casting magnesium alloy magnesium alloy types. 1, an alloy of magnesium alloy name is the name of the main alloying elements and their percentage of the name. 2, the main composition of the alloy (ASTM specifications) alloy names Mg Al Zn Mn Si Cu Ni Fe AZ91D bal. 8.5-9.5 0.45-0.90 0.17-0.4 <= 0.05 <= 0.025 <= 0.001 <= 0.004 AM60B bal . 5.6-6.4 <= 0.20 0.26-0.5 <= 0.05 <= 0.008 <= 0.001 <= 0.004 AM50A bal. 4.5-5.3 <= 0.20 0.28-0.5 <= 0.01 <= 0.008 < = 0.001 <= 0.004 AS41B bal. 3.7-4.8 <= 0.10 0.35-0.60 0.6-1.4 <= 0.015 <= 0.001 <= 0.0035 set a patented technology of magnesium alloy, rare earth ferrosilicon magnesium smelting electric arc furnace step Alloys method 2, aluminum, magnesium alloy solid solution or homogenization heat treatment method 3, the surface treatment of magnesium alloys 4, magnesium alloy die-specific processing group 5, magnesium alloy in the application of sprinkler equipment 6, the magnesium alloy in the system alloy doors and windows and make the application of sections 7, heat-resistant flame-retardant magnesium alloy and its melting and casting process 8, forming a new forging technology of magnesium alloy 9, magnesium alloy magnesium alloy melting method
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10, aluminum magnesium alloy containing treatment solution into the high corrosion resistance surface treatment of magnesium alloy products and its manufacturing method 11, the high corrosion resistance surface treatment of magnesium alloy products and its manufacturing method of 12, aluminum magnesium alloy cable tray sections 13 , aluminum-magnesium alloy cable tray 14, a color film coating of magnesium alloy products 15, Al-Mg alloy cable tray sections 16, aluminum-magnesium alloy notebook computer shell of carbon fiber make up jus cogens 17, high-strength magnesium alloy and its preparation method 18 special levels of magnesium alloy continuous casting machine 19, a magnesium alloy production process 20, a magnesium alloy melting flame retardant protection methods 21, 22 magnesium alloy surface treatment, surface treatment of magnesium alloy 23, the surface treatment of magnesium alloys Methods and magnesium alloy component 24, magnesium and magnesium alloy environmentally friendly anodizing electrolyte and its application 25, a material used to prepare the method of magnesium alloy ingots, 26, a magnesium alloy Preparation and grain products, 27 alloy 28 die casting method of thin-walled, containing mg2si strengthening phase refinement of magnesium alloy casting process 29, automotive and multi resistant magnesium alloy casting process 30,onitsuka tiger by asics for sale online, an ultrafine grain size of 31 magnesium alloy method , low-cost heat-resistant magnesium alloy 32, the solidification process of magnesium alloy surface alloying process 33, 34 magnesium alloy die casting, low cracking tendency of the solid solution strengthening of 35 high-strength magnesium alloy casting, low cracking tendency of high-strength magnesium alloys 36 , magnesium alloy and its manufacturing method
molded magnesium alloy products
37, with a wet blasting machine method of treatment, 38 magnesium alloy, magnesium alloy refining agents and production methods 39, molded magnesium alloy coating structure and the coating method and structure of the coating as the outer parts of the application of 40, 41 magnesium alloy scrap special milling machine, an electromagnetic pump filling system of low pressure casting of magnesium alloy 42, alloy scrap special CNC milling machine 43, a large cross- 44 bridge sections from the aluminum-magnesium alloy, aluminum-magnesium alloy anti-corrosion coating 45, downstream high purity magnesium and magnesium alloy melting crucible 46, the pressure flow of high purity magnesium and magnesium alloy melting crucible 47, through the calcium - magnesium alloy removed from the molten lead bismuth Methods 48, amide-based antifreeze concentrate, and for the protection of magnesium and magnesium alloys containing these coolant concentrate composition 49, magnesium and / or magnesium alloy parts manufacturing methods 50, furnace structure of magnesium alloy die-casting machine 51, does not help recovery furnace melting scrap magnesium alloy structure and recovery system 52, for the chemical conversion reagent magnesium alloy, surface treatment and magnesium alloy matrix 53, 54 creep resistance of magnesium alloys and magnesium alloy and its manufacturing method radiator 55, the steering wheel airbag magnesium alloy frame 56, a nd-sr ​​containing magnesium alloy and its preparation method 57, a compound used in flame-retardant magnesium alloy Modification Process 58, the surface of magnesium alloy multiple composite oxide film of oxidation treatment of 59, lost foam casting of magnesium alloy fire-retardant coating and its preparation method 60, zinc and aluminum magnesium alloy wire 61 of copper, magnesium alloy ceramic composite membrane and the Generation of 62 recovered waste Magnesium Alloy 63 technology and equipment, metal forming technology of magnesium alloy solid-state method 64, the furnace heating solid state diffusion surface of magnesium alloy or magnesium alloy products, method 65, a new type of rare-earth magnesium alloy corrosion resistant zinc-based anode material 66, the magnesium alloy helmet or helmet and its preparation method 67, with high corrosion resistance of magnesium alloy and magnesium alloy components 68, a tilting type melting furnace casting magnesium alloy unit 69, the high scalability of the manufacturing method of magnesium alloy 70, Magnesium Alloys Chromium Preparation and conversion coating solution used for film 71, 72, tough fire retardant magnesium alloy, with magnesium and magnesium alloy granulation method 73, a 74 Preparation of magnesium alloy, magnesium alloy wheels and the method of pressure casting apparatus 75, A cast magnesium alloy wheels and the melting and molding method 76, a magnesium alloy with a grain refiner and its preparation method 77, the metal mold casting magnesium alloy coatings and preparation methods 78, magnesium alloy iron flux and production methods 79 , magnesium alloy melting furnace 80, the regeneration process of Magnesium Alloy Wastes 81, ultrasonic anodic oxidation of magnesium alloy 82, copper wire manufacturing method of magnesium alloy 83, high-magnesium alloy cored wire line core agents and the production process 84, Excellent fluidity of magnesium alloy and the material 85, hot-rolled magnesium alloy plate manufacturing method and the method of 86 hot-rolled magnesium alloy, magnesium alloy sheet metal processing methods and special equipment for 87, electroless nickel plating on magnesium alloy method 88, magnesium Alloy special preparation ceramic foam filter 89, the surface of magnesium alloy Preparation of uniform polyaniline thin film 90, a large melting of magnesium and magnesium alloy products 91 ways to prevent shrinkage cracks, magnesium alloys and production methods than 92 silicon flux, magnesium alloy profiles rough, and its continuous casting and continuous casting device 93, a magnesium and magnesium alloy ingot casting methods 94 for the motorcycle engine cover on the left of magnesium alloy 95, in addition to the coating method, preparation method of recycling magnesium alloys and regeneration method of coating 96, for the motorcycle engine cover on the left 97 magnesium alloy for motorcycle engine on the right crankcase cover 98 magnesium alloy, magnesium alloy sheet hot stamping device 99, a magnesium and magnesium alloy ingots the pouring device 100, horizontal cold chamber magnesium die casting machine present, six magnesium alloy base construction has begun to take shape, the formation of the Chongqing - magnesium alloy automobile and motorcycle manufacturing, Qingdao - Information and communications product development, Shanghai - automotive industry, Shenzhen - magnesium alloy die-casting equipment, Liaoning - magnesium oxide and magnesium mineral development, Ningxia - Salt Lake magnesium resource development layout. Method of magnesium alloy corrosion chemical conversion treatment of magnesium alloy by the chemical conversion coating solution can be divided into: chromate system, organic system, phosphate, KMnO4, Department of Department of rare earth elements such as lines and tin salts. The traditional chromate film to Cr for the skeleton of the structure is compact, the structure of water containing Cr is very good self-healing, corrosion resistance is strong. However, the toxicity of Cr has a large, high cost of wastewater treatment, development of chromium-free conversion treatment is imperative. Magnesium alloy processing solution available in the KMnO4 amorphous organization of chemical conversion coating, corrosion resistance and chromate film quite. Alkaline stannate chemical conversion treatment of magnesium alloys can be used as pre-nickel plating, to replace the traditional with Cr, F, or CN, and other harmful ions process. Chemical conversion film coated porous structure in the activation of pre-show very good absorption, and can change the binding force of nickel-plated and corrosion resistance. Department dealing with the organic conversion film obtained simultaneously with corrosion protection and optical, electronics and other comprehensive performance, the chemical conversion treatment in the new development plays an important role. Chemical conversion film thin, soft, protective capacity is weak, it is generally used for decorative or protective layer of the middle layer. Anodic oxidation of chemical conversion can be obtained better than the wear resistance, corrosion-resistant base coat paint, and both good adhesion, electrical insulation and thermal shock properties, is commonly used in surface treatment of magnesium alloy technology one. Traditional anodizing electrolyte magnesium alloys generally contain chromium, fluorine, phosphorus and other elements, not only pollute the environment, but also damage human health. In recent years, environment-friendly technology research and development acquired resistance to corrosion and other properties of oxide film than the classic technique Dow17 and HAE large degree. Excellent corrosion resistance from the anodic oxidation of Al, Si and other elements evenly distributed on its surface, so that the formation of the oxide film has good density and integrity. There is generally believed that the pores in the oxide film of magnesium alloy corrosion resistance is a major factor. Found the solution by adding the appropriate amount of anodic oxidation of silicon - aluminum sol composition, to some extent to improve the oxidation layer thickness, density and reduce porosity. Sol composition and film speed will periodically fast and slow growth, but the film did not influence the phase structure of X-ray diffraction. However, the anodic film brittle, porous and difficult to obtain in a complex piece uniform oxide film. Metal coating of magnesium and magnesium alloy is the hardest metal plating for the following reasons: (1) the formation of magnesium alloy magnesium easy, not easy to be cleaned, seriously affect the coating adhesion; (2) the electrochemical activity of magnesium is too high, all the acid bath can cause rapid corrosion of magnesium matrix, or with other metal ions in the replacement reaction is very strong, after replacement with very loose coating; (3) The second phase (such as rare earth phase, γ equal) has a different electrochemical characteristics, may lead to uneven deposition; (4) coating is much higher than the standard potential of magnesium alloy substrate, any one hole will increase the corrosion current, causing serious electrochemical corrosion of the electrode potential of magnesium is very negative, Shi plating of hydrogen evolution caused by the pinhole is hard to avoid; (5) the density of magnesium alloy castings are not very high, the surface impurities, may become a source of coating porosity. Thus, the general method by chemical conversion coating of zinc or manganese, the first dip, then copper, then the other plating or chemical plating treatment in order to increase the coating adhesion. Magnesium alloy plating layer Zn, Ni, Cu-Ni-Cr, Zn-Ni and other coating, chemical coating is mainly Ni-P, Ni-WP and other coatings. Sometimes a single layer of electroless nickel plating is not good enough to protect the magnesium alloy. A study by alkaline electroless Ni plating layer and the combination of Zn-Ni coating, the coating thickness of about 35μm after passivation can withstand 800-1000h, after the neutral salt spray corrosion. It was also used as the underlying electroless nickel plating,vibram five fingers running shoes, nickel plating and then the DC can get ceramic coating of nickel, the average crystalline grain size of 40nm, due to the penetration of grain coatings greatly reduce the porosity of the structure is more dense. Electroplating or chemical plating is also access to excellent corrosion resistance, electrical and electromagnetic properties and decorative surface treatments. Disadvantage is that pre-treatment of Cr, F, and bath on the serious environmental pollution; the majority of the coating contains heavy metals, increasing the difficulty and cost recovery. The characteristics of the magnesium matrix, on the binding force also needs improvement. Laser treatment laser treatment are laser surface heat treatment and laser surface alloying of two. Laser surface heat treatment, also known as laser annealing, rapid solidification effect is a surface treatment. The laser surface alloying is based on the new technology of laser surface heat treatment. Laser surface alloying can get different hardness of the alloy layer, with a metallurgical bonding interface. Laser radiation source role in high-purity magnesium alloy cladding can also be obtained on single and multi-alloy layer. Use of broadband laser in magnesium alloy prepared by Cu-Zr-Al alloy cladding coating, due to the formation of a variety of coating enhanced the role of intermetallic compounds, the alloy coating has high hardness, elastic modulus, wear resistance and corrosion resistance. And because the existence of rare earth elements Nd, after laser surface melting followed by rapid laser multi-layer coating, grain size was refined to improve the density and cladding integrity. Laser treatment can deal with complex surface geometry, but in the laser processing of magnesium alloys prone to oxidation, evaporation and generation of vaporization, porosity, and thermal stress problems, design the correct treatment process is essential. Other surface treatment technology ion implantation at high vacuum, in the ten to hundreds of KV voltage electrostatic field, the accelerated high-energy ions (Al, Cr, Cu, etc.) to high-speed impact to deal with the internal surface of the implanted samples approach. Ions are injected into and stay in and solid solutions in the sample position of the space or gap to form a non-equilibrium surface layer. Studies suggest that the improvement of corrosion resistance is due to the densification of the natural oxide, radiation and the formation of ion implantation of magnesium nitride results. The performance of modified layer obtained by ion implantation and the amount and the thickness of modified layer, whereas the MgO substrate surface modified layer to improve corrosion resistance have certain role. Vapor deposition or evaporation deposition coatings, physical vapor deposition (PVD) and chemical vapor deposition (CVD) are two. It is the use of magnesium alloys can Fe, Mo, Ni and other impurities in a significant reduction, while taking advantage of a variety of coating defects in the substrate cover to avoid the formation of local corrosion cell, so as to achieve the purpose of improving the corrosion resistance. And other surface treatment of magnesium alloy technology, organic coatings and color protection technology with species diversity, adaptability, low cost and simple technology advantages. Widely used are organic solvent-based paints. Powder-based coating for organic solvent-free, and with less pollution and better corrosion resistance of uniform thickness and other characteristics, in recent years in the automotive, computer parts magnesium alloy shell and other applications more popular. Magnesium alloy die castings because insufficient clamping force, poor mold, mold strong enough, the melt temperature is too high and so there will be glitches surface phenomenon, a phenomenon called product burr, often companies will have to face the post-processing processing operations. At present, the nature of products is based on the use of hand-polished, and Zhao Ling frozen hydrogen explosion blasting machine to solve the magnesium alloy production measures of fire prevention and fighting of the cutting process of magnesium alloy 1.1 fire hazard properties of magnesium shavings and lively, very high temperatures easy to burn. Cutting process of magnesium alloy, magnesium scrap most of the incision is not the oxidation of magnesium and magnesium alloys. Since magnesium is a flammable when wet, fire points and low minimum ignition energy, combined with a small chip thin, large surface area, so high temperature burns easily in the air. 1.2 high-speed cutting will produce high temperature,onitsuka tiger mexico 66 women, ignition of magnesium shavings. Mechanical processing, in order to give full play to cutting tools, improve production efficiency and quality of the workpiece, normally require a higher cutting speed. The high-speed cutting metal chips tend to make the temperature up to 700 ° C ~ 1 000 ° C, when the lack of effective supply of coolant, the temperature will be sufficient to ignite the magnesium shavings on fire. 1.3 The high temperature combustion of magnesium shavings, fire spread quickly, fighting difficult. Magnesium in the event of fire, the combustion temperature of up to 3 000 ° C, heat of combustion of up to 25 121 kJ / kg. When the powdered form of magnesium shavings were mixed with air in a fire can explode. In addition, magnesium can occur at high temperature chemical reaction with water emit hydrogen gas, so the magnesium fire, water, foam, carbon tetrachloride and other extinguishing agents are limited, dry powder, Halon fire extinguishing agent effect is not obvious, the difficulty of fighting large. Metal cutting process factors that influence the cutting temperature metal cutting process, cutting 99% of deformation and the power consumed by friction into heat energy, can be used (1) says: Q total = Q1 + Q2 + Q3 (1) where : Q total - the total heat generated by the cutting process, also known as cutting heat; Q1 - changes in deformation heat power consumption; Q2 - the rake face and chip surface friction heat consumption; Q3 - flank and consumed by the chip surface friction heat. Cutting heat mainly through the chip, tool, workpiece, cutting fluid (such as cooling fluid, lubricating fluid) and the ambient air conduction out, when without cutting fluid, then most of the outgoing heat from the chip. Cutting technology of magnesium alloy fire prevention control the cutting speed 3.1. Cutting heat generation and increase the cutting speed was the same proportion, thus greatly cutting speed on cutting temperature. In practice, we found that the different cutting speed the cutting heat generated by the surface oxide film will chip color change. Therefore, under different cutting speeds through the cutting of magnesium alloy oxide film color, can be estimated from the safety of lathe spindle speed. 3.2 The correct choice of cutting fluid. Unless the mechanical structure itself is limited, the magnesium alloy cutting should always be an adequate supply of cutting fluid and chip when the lower temperature. Taking into account the chemical properties of magnesium, the choice of cutting fluid should be avoided combustible, with a strong oxidizing and high liquid water content, thereby preventing the cooling liquid when the temperature or the reaction exothermic combustion of magnesium shavings on fire. 3.3 strengthen the flammable, combustible items supervision. Cold cutting process using precision machine tools used in lubricants and hydraulic oil, rail oil, spindle oil, mostly flammable liquid, and generally have a larger storage capacity, such as general machine tools hydraulic oil of about 20 kg ~ 70 kg. Daily work should be strengthened so the repair and maintenance of equipment to keep machines in good condition to prevent oil spills. Left behind after the clean machine oil cloth, oil and cotton, etc., should be promptly cleared and isolated with the magnesium shavings. 4.1 magnesium shavings is prohibited to use fire fighting water, foam, carbon tetrachloride, carbon dioxide fire extinguishing agent to fight the blaze. 4.2 has been burning magnesium shavings should be used in D-class fire extinguisher. Such as 7150, D type dry powder, dry sand, taking into account the domestic market, 7150, D type dry powder fire extinguishers are not common, and dry sand on the machine (in particular, precision machine tools) damage to the large, can make the best choice according to the actual 75% 80% coverage flux powder plus 20% to 25% sulfur powder powder made by mixing the filling flux in the portable fire extinguisher put out the fire, the effect is obvious. 4.3 fire fighting magnesium shavings, should be made with the fire extinguisher nozzle to maintain a certain distance between the magnesium shavings to minimize the fire extinguishers in the injection process the impact of debris on the role of magnesium to prevent the spread of the formation of explosive mixtures of magnesium shavings. Atlas Atlas entry for more extended reading: 1
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