Titanium alloy deep hole thread processing technology

It is difficult to process deep hole threads of special material parts. For example, deep hole tapping on titanium alloy parts is very challenging. The scrapping of parts is very uneconomical due to the scraping effect caused by the break of the tap. Therefore, in order to avoid scratches, the correct tools and tapping techniques must be used.

Machining deep hole threads mean long-term contact between the tool and the workpiece. At the same time, more cutting heat and cutting force will be generated during the machining process. Therefore, when tapping small deep holes of special materials (such as titanium parts), tool damage and thread inconsistencies are likely to occur.

In order to solve this problem, two methods can be used: (1) increase the hole diameter before tapping; (2) use a tap specially designed for deep hole tapping.

The proper bottom hole is very important for thread processing. The larger threaded bottom hole can effectively reduce the cutting heat and cutting force during the tapping process. But it also reduces the thread contact rate.

The diameter increment of the threaded bottom hole mainly depends on the required thread contact rate and the number of thread heads per inch. Based on the above two values, the correct diameter of the threaded bottom hole can be calculated using the empirical formula.

Due to the difficulty of machining titanium parts, the cutting parameters and tool geometry must be fully utilized

Because titanium alloys have greater elasticity and deformation rate, a relatively small cutting speed is required. When machining small holes in titanium alloy parts, the recommended cutting speed is 10-14 inches per minute. We do not recommend using a lower speed because it will cause the workpiece to become hard during cold working. In addition, pay attention to the cutting heat caused by tool breakage.
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Use of titanium elbow

In the construction of various waterways and water pipes, we will use titanium alloy pipe elbows. What matters should we pay attention to when using titanium alloy elbows?

Titanium alloy pipe elbows have produced serious results and values ​​in equipment use, and have outstanding operating operations in certain environments and media.

According to the requirements of the workpiece and the surface condition, the titanium standard parts are received by alkali washing, water-soluble detergent, chlorine solvent sandblasting, shot blasting and other methods.

The titanium pipe elbow should be equipped with stable sealing performance to prevent the appearance of leakage and affect the normal operation of the pipe.

When the titanium alloy pipe elbow is equipped, the titanium alloy pipe elbow can be directly equipped on the pipeline according to the connecting steps, according to the application direction. Under normal circumstances, it can be equipped in the pipeline at any position, but it needs easy-to-operate inspection. The medium flow direction of the titanium alloy pipe elbow should be under the vertical valve and flow upward. The titanium alloy pipe elbow can only be equipped horizontally.
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The production process and welding quality of the titanium plate determine the quality of the titanium plate

A significant feature of the titanium plate is its strong corrosion resistance. This is because it has a particularly strong affinity for oxygen and can form a dense oxide film on its surface, which can protect titanium from corrosion by the medium. , Neutral saltwater solution has good stability in the oxidizing medium and has better corrosion resistance than existing stainless steel and other commonly used non-ferrous metals.

The quality of the titanium plate is largely determined by the smelting process of the titanium plate manufacturer, including the chemical composition of the titanium, the cleanliness of the titanium water (gas, harmful elements, inclusions) and the quality of the casting billet (component segregation, decarburization and Its surface condition), these aspects are the key control points of smelting operations.

In addition, industrial titanium plates also require sufficient hardenability to ensure uniform microstructure and mechanical properties across the spring section. The main cause of fatigue cracks in the oxide inclusions in titanium and the damage of type D inclusions to fatigue life is greater than that of type B inclusions. Therefore, foreign titanium factories and automobile factories have put forward higher requirements for the oxide inclusions in industrial titanium plates. For example, the Swedish SKF standard requires that the oxygen content in titanium is lower than 15-10-6, and the type D inclusions are lower than the type B inclusions. Things. In particular, Al2O3 and TiN inclusions are extremely harmful to the fatigue life of titanium springs. In order to produce high-quality industrial titanium plates, special smelting methods such as electric furnace-electro slag remelting or vacuum arc remelting are usually used in the past.

Because the titanium plate and titanium rod have special physical and chemical properties, their welding process is very different from other metals. Titanium welding is a TiG welding process that effectively protects the welding area by inert argon gas. Before using argon gas, check the factory certificate on the bottle body to verify the purity index of the argon gas, and then check whether the bottle valve leaks Or failure phenomenon.

When welding titanium plates and rods, you must ensure:

The metal in the welding zone is not polluted by the active gas NOH and harmful impurity elements CFeMn above 250℃. The purity shall not be less than 99.98%, and the water content shall be less than 50Mg/m32. Argon: industrially superior pure argon.

Can not form coarse grain structure. The welding process must be in accordance with the predetermined construction sequence, and can not produce large welding residual stress and residual deformation. so. Strictly follow the process of quality management standards and implement the whole process of quality control. All factors of human, machine, material and method are in a good controlled state, so as to ensure the welding quality of titanium pipe within a reasonable period of time.
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Pure titanium and titanium alloys are made into many daily necessities

Titanium alloy is the only metal that has the least damage to the human body, precisely because it has the least damage to the human body, and is then used as a raw material for implants such as human joints and bones. Japan invented a high-tech toothbrush in 2005. It has a built-in metal titanium tube that absorbs light and produces negative ions. There is no need to add toothpaste to the brush head and remove stubborn cigarettes and coffee to allow users to keep their teeth for a long time. White, fresh breath. This environmentally friendly toothbrush is named as clinically tested and proved that its cleaning effect is better than ordinary toothbrushes and electric toothbrushes. The key lies in the titanium rod that connects the toothbrush shaft and the brush head. It can convert light into negative ion energy. When the toothbrush is in contact with the tooth, the negative ions attract positive ions, and the tartar and stains collapse at the molecular level. You don’t need to rinse your mouth after use. It can be replaced. The extra-fine brush head ensures deep penetration into each tooth. This experiment proved that using this high-tech can effectively remove bacteria and stains in the oral cavity, reduce gum bleeding and allergies, and reduce the chance of gingivitis. The excellent biocompatibility of titanium is completely non-toxic, harmless, and non-allergic to the human body. After its appearance is treated by anodizing, the oxide film formed is antibacterial, not only light, high strength, corrosion resistance, and easy to high-temperature disinfection. , And then titanium alloys are made into many titanium daily necessities.

The surface of pure titanium products has a dense oxide film, which can be well adapted to various environments at room temperature. Therefore, the pure titanium kettle has strong corrosion resistance without spraying. Facing the outdoor environment with weak acid or alkali, the pure titanium kettle can deal with it freely. Whether it is river water or rain, mountains, rocks or vegetation, the pure titanium kettle can directly contact with it without being corroded. Since the whole body of the kettle is not painted, the kettle presents the unique gray color of pure titanium products, and it can also be heated directly on the fire source into a colorful color. The bright color of the titanium kettle The surface of metallic titanium is covered with a very thin naturally occurring oxide film (titanium and oxide TiO2). This layer of film can also become titanium rust, because a transparent film with high refractive index is formed on its surface, and the film acts as a prism. After the light is refracted and absorbed by light of different wavelengths, the color can be seen, and if this If the thickness of the layer oxide film is manually adjusted to 8~10cm, it can show thousands of similar colors depending on the wavelength. Because this film is a transparent film with high refractive index, it can show colorful colors.
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What industry uses raw materials such as titanium plates and titanium rods?

Passive titanium and titanium-based alloys are new structural materials, mainly used in the aerospace industry and marine industry.

The main uses of titanium plates: electronics, chemicals, watches, glasses, jewelry, sporting goods, mechanical equipment, electroplating equipment, environmental protection equipment, golf and precision processing industries.

The main uses of titanium wire: military industry, medical, sporting goods, glasses, earrings, headwear, electroplating hangers, welding wire and other industries.

The main uses of titanium tubes: environmental protection equipment, cooling tubes, titanium heating tubes, electroplating equipment, rings and various precision electrical appliances.

The main purpose of titanium rods: mainly used in mechanical equipment, electroplating equipment, medical, various precision parts and other industries.
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Industrial pure titanium is graded according to the content of impurity elements

Titanium has many obvious superior characteristics: low density (4.5kg/m3), high melting point (1660°C), strong corrosion-resistance, high specific strength, good plasticity, and high mechanical properties can also be produced by alloying and heat treatment. The various alloys are ideal structural materials for aerospace engineering. Α-phase titanium-containing a certain amount of oxygen, nitrogen, carbon, silicon, iron and other element impurities. It has excellent stamping process performance, good welding performance, insensitive to heat treatment and structure type, and has a certain strength under satisfactory plastic conditions.

Industrial pure titanium is graded according to the content of impurity elements. Its strength mainly depends on the content of interstitial elements oxygen and nitrogen. It has high corrosion resistance in seawater but is poor in inorganic acids. It is generally used to manufacture various sheet parts or forgings that work at a temperature of -253 to 350°C and does not bear much force. It can also manufacture rivet wires and pipes. Application examples: In addition to the use of industrial pure titanium to make parts, titanium alloys are widely used in the industry. It has been widely used in aviation, aerospace, chemical, shipbuilding and other industrial sectors, manufacturing gas turbine components, making biomaterials such as prostheses.
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Titanium alloy is more suitable for spacecraft manufacturing than steel

Aerospace vehicles work under extreme conditions such as ultra-high temperature, ultra-low temperature, high vacuum, high stress, and strong corrosion. In addition to relying on excellent structural design, they also rely on the excellent characteristics and functions of the materials. Titanium alloy combines the characteristics required by aerospace products and is known as "cosmic metal" and "space metal". Titanium alloy has become an ideal manufacturing material for aircraft and engines due to its high strength, good mechanical properties and good corrosion resistance, but its poor machinability has restricted its application for a long time. With the development of processing technology, in recent years, titanium alloys have been widely used in the manufacture of parts such as the compressor section of aircraft engines, engine hoods, exhaust devices and the manufacture of structural frame parts such as aircraft girder frames.

Compared with general alloy steel, titanium alloy has the following advantages: higher specific strength: the density of titanium alloy is only 4.5g/cm3, which is much smaller than iron, and its strength is similar to that of ordinary carbon steel. Good mechanical properties: Titanium alloy has a melting point of 1660°C, which is higher than iron, and has higher thermal strength. It can work below 550°C and usually shows better toughness at low temperatures. Good corrosion resistance: A dense oxide film is easy to form on the surface of titanium alloy below 550℃, so it is not easy to be further oxidized. It has high corrosion resistance to the atmosphere, seawater, steam, and some acids, alkalis, and salt media.

High-temperature titanium alloys: The research and development of supersonic cruise bombs, hypersonic cruise bombs, reusable vehicles, and suborbital reusable transatmospheric vehicles require titanium alloys to be used at high temperatures of 600°C and above, which requires Titanium alloys must have excellent high-temperature resistance. The first high-temperature titanium alloy in the world is Ti6Al4V developed by the United States, which can be used at 300～350℃. Ti6Al4V alloy has both α + β two-phase characteristics and is widely used in the aerospace field. In order to maximize the effect of Al solid solution heat strengthening, Sn, Zr, Mo and Si are also added to the titanium alloy, and alloys such as IMI679 and Ti6242 with a use temperature of 450 ℃ have been developed successively, and IMI685, Ti6242S and other alloys using IMI834, Ti1100, BT36 and other alloys at a temperature of 550-600°C.

Low-temperature titanium alloys: With the rapid development of space technology, the application of titanium alloys in low-temperature and extremely low-temperature environments has increased, and the development of low-temperature titanium alloys is extremely important. Research has found that reducing the content of interstitial elements such as H, O, N and Al can improve the low-temperature performance of titanium alloys, so that they can be used for a long time under a 20K temperature environment.
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