The blanking technology of the titanium alloy forging

                         Forging of titanium alloy forging (rolling) rods Titaniumcn, the alpha layer of the surface with a layer of hard brittle, die forging, need to get rid of this layer, so as to avoid forging billet caused by surface cracking.For less than 50 mm diameter rod, need to remove the surface layer of 3 mm thick, diameter greater than 50 mm, need to get rid of 5 mm.For extrusion bar, less than 50 mm diameter, can be car to 2 mm, greater than 50 mm in diameter, generally to 3 mm.After cutting, there are still defects, such as individual site, partial grinding can be eliminated, the grinding depth should not be greater than 0.5 mm.

Definite size titanium alloy forging blank available anode cutting machine, sawing machine, lathe, punching and shearing machine, grinding wheel cutting machine or cutting on the forging hammer or hydraulic press.The highest efficiency in the punching and shearing machine.
(1) the thickness of the disk saw cutting disc saw blade between 2 ~ 8 mm, suitable for cutting bar diameter is larger.Disk saw the linear velocity of about 30000 ~ 35000 mm/min, the feed amount of hours to get a clean face.To prevent metal bond tools, metal burns, can use suspension to reduce friction, cooling cutting tools.
(2) the cutting of titanium alloy anode, mechanical cutting, incision width of no more than 3 mm, with a concentration of 1.28 ~ 1.32 g/cm3 water as working fluid.Although anodic cutting cut cost less, but less rate is low.
(3) before the hammer or hydraulic press for cutting cutting, bar should be preheated to deformation began cutting temperature (or chop).Pure titanium in punching and shearing machine cold shearing.
(4) lathes cutting of titanium alloy car cutting, cutting speed should be within 25000 ~ 30000 mm/min, feed quantity is 0.2 ~ 0.3 mm/week.
Scalping remove the alpha layer, car to specification: the cutting rate of 15000 ~ 20000 mm/min.No alpha layer when turning the standard related to surface roughness: when the roughness Ra = 0.63 ~ 2.5, feed quantity is 0.08 ~ 0.1 mm/week;Ra = 1.25 ~ 5, the feed quantity is 0.1 ~ 0.2 mm/week;When Ra = 2.5 ~ 10, feed quantity is 0.3 ~ 0.4 mm/week., turning processing must be used when the lubricating coolant supply 1 ~ 1.5 MPa pressure.
(5) grinding wheel cutting of titanium alloy rod diameter less than 60 mm, appropriate is used grinding wheel cutting.When the diameter of the grinding wheel cutting more than 20 mm, should use the cooling fluid.Grinding wheel cutting efficiency is higher, but the life of the grinding wheel piece is shorter.
Blank after cutting, end of the acute Angle should be round.Otherwise end forging or heading on horizontal forging machine, may cause folding.The blank diameter of less than 50 mm, acute Angle round radius R is 1.5 ~ 2.0 mm;The blank diameter of more than 50 mm, acute Angle round radius R is 3 ~ 4 mm.

The special properties of nickel and titanium alloy

1, the characteristics of shape memory (shape memory) shape memory is when the mother of a certain shape by Af temperature cooled to Mf temperature above the following after the formation of martensite, the martensite temperature deformation under Mf, and through heat below Af temperature, along with the inverse transformation, material will automatically restore its shape in the parent phase.Actually shape memory effect is one of the nickel titanium alloy by thermal induced phase transformation process. titaniumcn
2, super elasticity (superelastic) of hyperelastic refers to the sample production under external force is greater than the elastic limit stress strain variable, the phenomena of strain can be automatically restored when unload.Namely in the parent phase state, as a result of the action of applied stress, cause stress induced martensite phase transformation, thus alloy showed different from ordinary material mechanics behavior, its elastic limit is far greater than ordinary materials, and no longer comply with hooke's law.Compared with shape memory properties, hyperelastic without heat.To sum up, super elasticity refers to the internal stress within a certain deformation range increase along with the increase of strain, super elasticity can be divided into two categories, linear superelasticity and nonlinear hyperelastic.The stress-strain curve of stress and strain of the nearly linear relationship.Nonlinear hyperelastic refers to the Af above a certain temperature range, respectively, in the process of loading and unloading stress induced martensitic transformation and its inverse transformation results, so the nonlinear hyperelastic also called phase change pseudo elastic.Phase change of the nickel titanium alloy pseudo elastic can reach about 8%.Nickel titanium alloy of hyperelastic can change with the change of the heat treatment conditions, when the arch wire is heated to 400 & ordm;C above hyperelastic began to decline.
3, in the mouth temperature sensitivity: stainless steel wire and treatments of the CoCr alloy wire tooth orthopaedic basic is not affected by the influence of the temperature of the mouth.Treatments of the superelastic Nitinol wire tooth orthopaedic force along with the change of oral temperature changes.When the deformation must be.And correcting force increases as the temperature increases.On the one hand, it can accelerate the movement of the teeth, this is because the change of temperature in the oral cavity can cause capillary stimulation caused by rectification device stagnation of blood flow, blood flow to the sluggish rate so as to make the repair cells in the process of moving teeth get adequate nutrition, to maintain its vitality and normal function.Orthodontic doctors can't accurate control, on the other hand, or force measurement of oral environment correction.
4, corrosion resistance, studies have shown that the corrosion resistant properties of nickel and titanium wire and stainless steel wire
5, poison resistance: niti shape memory alloy special chemical composition, that is, this is a nickel titanium alloy atom, containing about 50% of the nickel, nickel and known have carcinogenic effect and promote cancer.General cases, the surface layer of titanium oxide ACTS as a barrier, the Ni Ti alloy has good biocompatibility.Surface layer TiXOy and TixNiOy can inhibit the release of the Ni.
6, treatments of the soft power: the teeth of commercial application of wire including austenitic stainless steel wire, cobalt - chrome - nickel alloy wire, nickel chromium alloy wire, alloy silk, gold wire and Australia to decide the titanium alloy wire.About the orthodontic correction of wire in the tensile test and three point bending test conditions of load - displacement curve.Nickel titanium alloy curve of unloading platform the lowest and most flat, it can provide most persistent treatments of the soft power.
7, good damping characteristics: caused by chewing and night molars for arch wire vibration, the greater the damage of tooth root and periodontal tissue.Through different attenuation experiment results, the study found the arch wire stainless steel wire vibration amplitude is larger than hyperelastic nickel titanium silk, super elastic nickel-titanium arch wire the initial vibration amplitude is only half of stainless steel wire, good vibration and shock absorption characteristics of the arch wire is important for the health of the teeth, and traditional arch wire such as stainless steel wire, tend to increase the root absorption.

titanium alloy and nickel alloy

Titanium alloy titaniumcn has good heat resistance strength, toughness and fracture toughness at low temperature, so the more used as aircraft engine components and rocket and missile components.In addition, because the titanium alloy also has good compatibility with the human body, so the titanium alloy can also be artificial bone.
The corrosion resistance of zirconium nitrate titanium and zirconium hydroxide titanium is a kind of application to the atomic energy industry and used as a corrosion resistant chemical materials under high temperature and high pressure, but its live wave after sodium in aqueous solution.According to the experiment, titanium into the bottom 20 ~ 50 annual average won't corrode.
Under normal temperature, nickel in wet surface and the oxide film formed in the air, not only can prevent continue to be oxidation, corrosion and alkali resistant, salt solution.Massive nickel does not burn, thin nickel wire flammable, special tiny porous nickel particles in the air will be spontaneous combustion.When heated, nickel with oxygen, sulfur, chlorine and bromine intense reaction occurs.
Nickel chromium alloy is mainly used to manufacture stainless steel and other corrosion resistant alloys, such as nickel steel, nickel chromium steel and various non-ferrous metal alloy, nickel composition higher copper and nickel alloy, easy corrosion.Hydrogenation catalyst and also used in ceramic products, glass, electronic circuit, special chemical vessels with green and nickel compound preparation and so on.
Elements of auxiliary materials:
Nickel content in the earth's crust, is greater than the common metals such as lead, tin, but much less obvious than iron, and nickel and iron melting point, thus doomed it found later than iron.
Nickel basic knowledge is introduced
In nature, the main nickel mine is the red nickel (nickel arsenide) and fai arsenic nickel (sulfur nickel arsenide).Cuba is one of the world's most famous contain nickel countries, also have a large amount of nickel in the Dominican republic.
Nickel is mainly used in electroplating industry, nickel plated item is beautiful, clean, and not easy to rust.Very fine nickel powder, in the chemical industry used as catalyst.
Titanium alloy has a "memory" of ability, and memory is very strong, after a long time, repeated millions of times are accurate.It is "memory" of the ability to remember its original shape, so people call it "shape memory alloy.This alloy has a characteristic transition temperature, above the transition temperature, it is a kind of organizational structure, and under the transition temperature, it is another kind of organizational structure.The structure, performance is different.For example, a nickel titanium memory alloy, when it is above the transition temperature, is very hard, strength, and under this temperature, it is very soft, easy to manufacture.What shape memory so that when we need it, just make it a kind of shape, this is it "permanent memory" shape, below the transition temperature, because it is very soft, we can in a considerable degree of arbitrary deformation.When need it to restore to its original shape, as long as it is heated to just above the transition temperature.
Nickel are magnetic, can be magnet attracted.And made of aluminum, cobalt and nickel alloy, magnetic is stronger.This alloy by electromagnet attraction, not only they will be sucked in the past, and below it hanging sixty times heavier than its thing, also won't fall down.In this way, it can be used to manufacture magnetic crane.
Nickel salts are mostly green.Nickel hydroxide is dark brown, nickel oxide is a film.Nickel oxide is used to manufacture iron nickel alkaline battery.

titanium and titanium alloy welding

Titanium and titanium alloy titanium cn with a small specific gravity, high strength and good high and low temperature performance, it in wet chlorine gas, oxygen acid salt,
Stone of urea, nitric acid, acid, phenol and other most acid, alkali, salt medium has excellent crack resistance and corrosion resistance
Can, make it become the prospects for a broader range of new structure material, more and more widely used in petroleum chemical industry, military industry,
Aerospace, pharmaceutical and other fields.


But, as a result of titanium in high temperature, strong chemical lively sex, high melting point, small amount of hot melt and poor thermal conductivity
Characteristics, so its weldability and ordinary carbon steel, low alloy steel, stainless steel, aluminum, copper and so on different significantly
Points.


In order to open up channels for production, adapt to the needs of my company's chemical production, we conducted industrial pure titanium welding process
Test and welding joint quality control of project study.
Pure titanium welding technology main points:
Welding environment ventilated, dry, dust-free and steel structure prefabrication site isolation.Wind speed is small
At 2 m/SEC, with indoor (or relative) homework as well.The humidity is less than 90%.Chemical composition and mechanical performance of welding wire with the parent metal, high plasticity, the purity should be higher than the parent metal.The argon gas purity is greater than or equal to
Moisture 99.99%, less than or equal to 50 ml/m. should have high frequency arc welding machine, current attenuation and gas delay protective device.
After welding inspection
Weld surface inspection, colour and lustre is whether inspection of industrial pure titanium oxide, check the protective effect and important
Ring.Each layer of each bead should be checked to find unqualified bead heavy weld shall be removed.
The underlying weld shall be to penetrate for inspection.
Butt joint X-ray flaw detection should be 100%
Titanium pipe welding technology is in the atmosphere using manual tungsten inert gas protection welding welding method.Before welding of titanium pipe groove and less than 25 mm on both sides of the internal and external surface after removal of oil pollution, application of austenitic stainless steel wire brush, reamer and other mechanical methods to remove the oxide film, burr and surface defects.Cleaning tools should be dedicated, and kept clean;After mechanical cleaning the surface of the groove and the fill welding wire, welding should use sulfur-free acetone or ethanol degreasing treatment.During the welding process, the use of special protective measures, make the titanium pipe welding area partial or all of the parts may be over 400 ℃ temperature in argon gas protection, achieve the goal of titanium pipe welding.
Under construction and prepare materials acceptance to line inspection, processing and groove to groove peripheral processing, welding group on to welding, weld appearance inspection to P T, RT flaw detection, hydrostatic test to drainage, drying, prefabricated pipe section pipe mouth closed transportation and assembly on site.

titanium alloy for aerospace industry

Titanium alloy titanium cn is widely used in the aerospace industry and other industrial sectors. With the rapid development of science and technology progress and our national economy, as the "great rise of the third generation of metal titanium industry will".

The characteristics and application of titanium alloys for Aerospace

As the rise of aerospace materials, titanium alloy has the following advantages:

(1) high strength ratio. Titanium alloy with very high strength, the tensile strength is 686~1176MPa, and the density is only about 60% of steel, so the intensity ratio is very high.

(2) excellent high temperature performance. Titanium alloy can still keep good mechanical properties at high temperature, its heat resistance is much higher than that of aluminum alloy, and a wide operating temperature range.

(3) the corrosion resistance. At 550 ℃ in air, the titanium surface will form a thin and compact titanium oxide film, its corrosion resistance is better than that of most stainless steel.

In the aviation industry, titanium alloy is mainly used in the manufacture of jet engine compressor disk, disk, blades, casing, as well as large main landing gear support beam, the rear section and the steering beam structure. Because the titanium alloy has high specific strength and high temperature characteristics, used in the manufacture of aircraft engine and airframe can effectively improve the engine thrust weight ratio and the mechanism efficiency, help to alleviate thermal phenomena in many aerospace applications, titanium and its alloys are replacing the traditional aluminum alloy. Now, titanium materials aerospace industry consumption accounts for about 42% of total global production, and from now to 2010, is expected to titanium materials demand will continue to grow at a rate of two digit. A new generation of aircraft need to fully utilize the performance of titanium alloy provided, whether commercial or military aircraft market, are pushing demand on titanium alloy. The Boeing 787, the Airbus A380, the F-22 Raptor fighter, the F-35 Joint Strike Fighter (also known as the lightning II) and other new models have used a lot of titanium alloy material. Current situation of machining titanium alloys for Aerospace

In order to meet the growing of the titanium alloy processing aviation manufacturing industry demand, manufacturers need to increase production capacity, so we need to better understand the effectiveness of titanium alloy processing strategy. Machining of titanium alloy workpiece typical is from forging began, until the 80% material is removed to obtain the final shape of workpiece.

With the rapid growth of aviation parts market, manufacturers have to feel powerless, processing requirements and for titanium alloy machining efficiency is low and increased, leading to the titanium alloy processing ability is obviously in a state of tension. Some aviation manufacturing leader even publicly questioned the processing task machining capability of existing can complete all the new titanium alloy workpiece. Because these parts are made of new type alloy, so we need to change the way of processing and cutting tool materials.