Gray cast iron casting mainly refers to a flake graphite cast iron, the more thin than cast steel can be obtained and complex casting, cooling speed sensitivity is very big, and gray cast iron after heat treatment process, mainly in the following three ways.1, the stress relievingCastings in the casting cooling process, due to the different cooling rate of each part, easy to produce stress, may result in warping and casting cracks, in order to ensure the dimensional stability, prevent deformation, for some complex shape of castings, such as bed, cylinder block, cylinder head, etc., need to eliminate internal stress annealing.Its specification is commonly: heating temperature of 500 ~ 550 ℃, the heating speed of 60 ~ 120 ℃ / h, furnace cooling after heat preservation time to 150 ~ 220 ℃ from air cooling.2, eliminating casting chilling annealingGrey cast iron surface and some thin section, in the process of condensing cooling speed faster, easier to produce white tissue, increase the har

Magnetic separator according to the strength of magnetic field can be divided into:(1) the weak magnetic field magnetic separator, magnetic pole surface magnetic field intensity H0 = 72 a 136000 / m, magnetic field force HgradH = (2. 5 ~ 5. 0) 2 / m 3 x 1011 Ann;(2) of the magnetic field magnetic separator, magnetic pole surface magnetic field intensity H.= 160 ~ 480000 a/m;(3) strong magnetic field magnetic separator, magnetic pole surface magnetic field intensity H.= 480 ~ 1.6 million l m, magnetic field force HgradH = (1.5 ~ 6.0) x 1013 2 / m 3.Strong magnetic magnetic separator is mainly used to remove miscellaneous stone, improve quality, achieve sales.Weak magnetic equipment lean manganese ore, lean hematite, limonite, non-ferrous metal ore or slag separation, purification, concentrated in the ore and miscellaneous stone separation, thus improve the metal grade of concentrate.Influence of strong magnetic magnetic separator magnetic effect factors are the following:1. Mine magneti

In recent years, with the continuous development of domestic economy, our country has become the industrial powerhouse, stainless steel flanged ball valves in the field of industrial demand is growing, in addition, the influence of the stainless steel flanged ball valves in the field of civil has also been gradually expanding.Today, small make up take you to understand the characteristics of stainless steel flanged ball valves.What is a stainless steel flanged ball valves?What are the characteristics?Stainless steel flanged ball valves is learned the different structure of ball valve and V valves and track ball valve and advantages to develop new products.Stainless steel flange ball valve adopts double eccentric sealing structure, wear small, small torque, good sealing performance, long service life.Stainless steel flange ball valve seat and half sphere with special hardening process, especially to adapt to the harsh working conditions is resistant to wear and tear, scouring resistance

9 Ni steel is w (Ni) is 8.5% ~ 9.5% of low carbon martensite is a cryogenic steel size, is a kind of excellent material used in the manufacture of LNG storage tank.9 ni steel welding, appropriate USES string cable energy, multilayer multipass welding, without preheating before welding, but need to control interlayer temperature below 100 ℃.Specific process is:1, the welding methodsAt present, the 9 ni steel can be adopted method of welding is mainly: electrode arc welding (SMAW), submerged arc welding (SAW).2, welding material,In order to obtain the superior performance of welded joint, to guarantee the weld has adapted to 9 Ni steel low-temperature toughness, the welding must use appropriate welding material in the production, according to the mass fraction of the Ni can be divided into: 1) more than 60% of Ni base type (Ni - Cr, Mo alloy);2) 40% Fe - Ni base type (Fe - Ni - Cr alloy).These two types of welding materials is the most suitable choice of 9 ni steel welding.3, welding cur

Precision forging forming technology, also known as the shape or near net shaping technology refers to the parts after forming, need only a small amount of processing or not processing, can be used as the forming technology of mechanical components.In production practice, people used to place the precision forging forming technology is divided into: cold precision forging forming, hot forging forming, warm precision forging forming, the compound forming, block forging, the isothermal forging, forging, etc.1, the cold precision forging formingWill not be heated directly for forging metal materials, mainly including cold heading and cold extrusion piled.Cold precision forging forming technology is suitable for many varieties and small batch production, mainly used in the manufacture of automobile, motorcycle parts and some parts of tooth profile.2, hot forging formingMainly refers to the above the recrystallization temperature of precision forging forming technology.Hot forging forming p

Casting is a metal humans master earlier hot working process, about 6000 years of history.China between 1700 ~ 1700 b.c. Has entered the heyday of bronze casting, craft has reached a quite high level.Defines how to foundry industry?Casting is a liquid metal casting to match the shape of parts with the casting cavity, after waiting for the cooling and solidification, for parts or method of blank.Was originally cast material for more solid but heated to liquid metal (example: copper, iron, aluminum, tin, lead, etc.), the materials of mold can be sand, metal and ceramics.According to different requirements, the use of the methods will also be different.Definition and classification is introduced in foundry industry are as follows.The casting industry definitionCasting industry market survey analysis, casting is a metal melting into meet certain requirements of the liquid is poured into the mold, after cooling solidification, men get a predetermined shape, size and performance of the casti

Hematite magnetic separator reducer has two types of similar structure, the transmission way looks compact structure, the structure is novel, the use of the reducer is advanced, but in fact use effect and economy are not ideal.1, hematite magnetic separator (or cycloidal reducer must be 45 ° ~ 50 ° inclined to decorate, the upper bearing for lack of lubrication, easy fever, accelerated wear and tear, vibration, so often burn out bearing, tend to cause downtime; lower input shaft due to poor dynamic sealing effect, install the seal, seal can fail after a period of running, leakage phenomenon, a large amount of waste lubricating oil, the scene of the pollution of the environment. Job requirements often add lubricating oil at the same time, increased maintenance workload and labor intensity.2, hematite magnetic separator technology difficulty, general small and medium-sized cement plant maintenance workers is very difficult, even able to cope with maintenance, often due to the maintenance

What is the distinguishing feature of full welded ball valve structure?This paper will detail for you full welded ball valve structure characteristics.The structure of full welded ball valve:1. The valve is made of carbon steel seamless steel tube pressing forming integral welded ball valve.2. AISI303 stainless steel stem, AISI304 stainless steel body, after finishing grinding production, good sealing performance and corrosion resistance.3. The seal using carbon reinforced PTFE inclined plane elastic seal negative pressure on the sphere, make the seal reach zero leakage and long service life, etc.4. This valve connection mode: welding, thread, flange and so on for the user to choose from.Transmission way: by using the handle, turbine, such as pneumatic, electric transmission structure, flexible light switch.5. The valve structure is compact, light weight, easy to heat preservation, ease of installation.6. One-piece welded ball valve absorb foreign advanced technology, combined with dom

Stud welding is the stud 2-25 mm in diameter or columnar metal efficient, low cost, full face fusion welding on the surface of the metal, a special welding method.The application of this technology could replace some traditional processing methods, such as: drilling, tapping, manual welding, welding processing, etc.Down capacitive energy-storage stud welding machine manufacturers to talk about advantages and classification of stud welding:Stud welding advantages:First: the weld fusion whole section, improved the security of the welding positionSecond: welding in instantaneous, improves welding efficiencyThird: can adapt to a variety of metal materialsFourth: small heat affected zone, parent metal welding deformation is smallFifth: welding damage is very small, the back of a parent metal without or only a small welding damageSixth: keep the leakproofness of hollow partsSeven: the single side weldingEighth: easy to operate.Stud welding classification:According to the principle of the cha

Investment casting the biggest advantage is due to the investment casting with high dimensional accuracy and surface finish, so can reduce machining work, only in parts a little higher requirements on the parts machining allowance, and even some castings only grinding, polishing allowance, don't need to machining can be used.Below is the processing technology of stainless steel precision casting industry characteristics analysis.Stainless steel precision casting industry processing process characteristics analysisOn the mechanical properties of the stainless steel precision casting is higher than cast iron, but its worse than cast iron casting performance, belong to the said revestment precision casting and precision casting.Its high melting point, easy oxidation of liquid steel, poor liquidity, contraction of molten steel, stainless steel precision casting is not only applicable to various types, all kinds of alloy casting.The processing technology of the stainless steel precision cas