Titanium alloys are used more and more in bicycles

With the excellent properties of titanium, the role of titanium and titanium products has become more extensive.

Our most common titanium products are titanium plates, titanium rods, titanium standard parts, titanium dioxide and even titanium wires. With the continuous research and development of titanium, the application fields of titanium are more and more extensive, and there are more and more titanium, titanium alloys and various titanium products. Let's take a look at the classification and use of titanium wire.

Titanium wire can generally be divided into pure titanium wire and titanium alloy titanium wire according to whether the raw material is pure titanium or titanium alloy; it can also be divided into titanium alloy, near alloy, (+) alloy, near alloy, and alloy according to the composition. It can also be classified according to the different properties of the titanium wire, and can also be classified according to others. However, the classification basis of other titanium wires is less and can be adjusted according to different parameters of various industries.

The basic characteristics of titanium, such as corrosion resistance, high hardness, non-magnetic, high temperature and low-temperature resistance, etc. This leads to a wide range of applications for titanium products.

At present, the application fields of titanium are still concentrated in aviation, aerospace, chemical, medical, automotive, construction, sports, industry, leisure and so on. So far, titanium is still in short supply, and there is still great potential for development.
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So far, the extrusion process of the titanium rod has to use a lubricant.

With the increasing amount of titanium alloy materials on various power systems, the surface protection of titanium alloy parts during processing becomes particularly important.

Titanium alloy has a good specific strength, high heat resistance, excellent corrosion resistance and low density. It has been widely used in aviation, aerospace, ship and chemical industries. Especially in the power system, a large number of titanium alloy materials are used, which has far-reaching significance for reducing the weight of the system and increasing the thrust-to-weight ratio.

What are the protection requirements for titanium alloys during machining? The following titanium alloy machining parts manufacturers introduce a few points:

(1) When cutting titanium alloy parts, machine tools and tools with good rigidity, and special tooling with low vibration and strong rigidity should be used. The special tooling for titanium alloy parts is not allowed to have active metal coatings such as zinc plating and cadmium plating to prevent the organization of titanium alloy parts from being exchanged with the tooling due to electrochemical corrosion and to prevent the cadmium brittleness of the titanium alloy. Choose suitable tooling to minimize the processing stress of titanium alloy parts and avoid deformation.

(2) When processing titanium alloy, use a lower cutting speed, sharp tool, and take a big knife. However, the tool is not allowed to stop during the machining process. At the same time, choose the specified halogen-free coolant to prevent the surface of the titanium alloy from being overheated and sticking to the knife, which may lead to the problem of metal tearing and deterioration of the surface of the part.

The sticking of the knife is mainly caused by the chemical affinity of the titanium alloy and the tool material. The use of a chloride-free coolant can not only prevent overheating, but also have a certain lubricating effect, reduce the phenomenon of tearing, and extend the use of the tool. life.

(3) Titanium alloys are prone to cold work hardening. Therefore, the depth of the cut should exceed the thickness of the cold work-hardened layer produced during the previous cutting. The tool should have both anti-wear ability and high thermal hardness. The machining depth should be ensured by controlling the rigidity of the lathe, the cutting tool and the clamping degree of the parts.

(4) When milling titanium alloy parts, it is recommended to use high-speed steel multi-edge milling cutters embedded with cemented carbide. Disc milling cutters should adopt down-milling technology. When reverse milling, the stability of the milling cutter is reduced by half, so The finish of the machined surface will have severely deteriorated.
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What are the precautions for titanium pipe welding

In terms of high-quality welds, titanium pipes must meet the following conditions:

1. Welders with qualification for welding titanium pipes.

2. High purity gas protection.

3. High-purity titanium alloy welding wire.

4. Double-sided protection is required for the requirements of the filming site to prevent root oxidation.
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Difficulties in machining thin-walled titanium alloy workpieces

 In the machinery manufacturing industry, titanium alloy materials have characteristics that other metal materials cannot have: high specific strength, high thermal strength, and good corrosion resistance; the alloy density is only 58% of steel, so the thinner made of titanium alloy materials The wall shell structure will become a common workpiece for defense products. Due to the thin wall of the workpiece, it is easy to deform during processing. The radial clamping force causes elastic deformation of the workpiece. The rapid tool wear makes the processing size unstable, and it is difficult to ensure the processing quality. The workpiece rejection rate and processing cost remain high. Technicians and processing operators.

The traditional titanium alloy thin-wall workpiece processing does not pay attention to the selection of tool materials and cutting elements, which makes the processing tools wear fast and increase the deformation; only a single turning process is used instead of a gradual cycle of stress relief technology

There are many factors that affect processing deformation, mainly reflecting the following aspects.

(1) The deformation of the workpiece caused by the thin cutting heat

The thermal conductivity of titanium alloy materials is lower than that of stainless steel and high-temperature alloys. The difference in heat dissipation conditions is 1/4 and 1/16 of that of iron and aluminum, which makes the temperature of the cutting zone rise rapidly, and it is not easy to dissipate near the cutting edge, resulting in processing The stress concentration near the tool tip causes the tool to wear and chip, and cause the workpiece to deform.

(2) The rigidity of the workpiece is poor. During the cutting process, the machine tool vibration and cutting elements are not suitable to produce deformation. The thin-walled workpiece has poor rigidity and is caused by machine tool vibration and other factors. , Cause deformation.

(3) Radial clamping force deforms during workpiece cutting

When the titanium alloy thin-walled workpiece is processed and clamped, under the action of the radial clamping force, it is easy to cause elastic deformation, which affects the dimensional accuracy and shape tolerance requirements of the workpiece.

(4) Deformation caused by stress release during workpiece cutting

During the processing of thin-walled titanium alloy workpieces, each time the metal is cut, the stress will be released, causing the workpiece to deform.
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How to extend the service life of titanium plates

The service life of the titanium plate is very important. With the extension of use time, the gasket of the titanium plate must be replaced. The replacement time of the imported equipment gasket is 2 years, and the replacement time is about 5 years. If it is used for too long, cracks will occur.

With the gradual development of my country's food, medicine, chemical, refrigeration and other industries, the application fields of titanium plates are also very extensive. Facing the huge market prospects, my country's titanium plate manufacturers continue to break through new technologies to create a series of advantages such as energy-saving heat exchange, high heat exchange efficiency, high-pressure resistance, and easy cleaning. Of course, the service life will be longer than before.

So how to improve the service life of the titanium plate? Technicians say that the life of the titanium plate is related to many factors. Next, we will enter the topic to discuss the life of the titanium plate and the factors related to it.

1. When using titanium plates, pay attention to pressure fluctuations and control the temperature to ensure the stability of the pressure. Overpressure operation is not allowed, which will affect the life of the titanium plate.

2. When the device is turned on, the device starts to run. If the pressures of the two media are different, open the low-pressure side valve first, and then open the high-pressure side valve. Prevent excessive pressure difference and prevent plate deformation and leakage.

3. The cleaning of the titanium plate is very important, because the long-term operation of the equipment will cause scaling, corrosion, and coking of the medium, and scaling will occur inside and outside the water pipe, which requires thorough cleaning. Common cleaning methods include water washing, steam blowing, mechanical cleaning and chemical cleaning.

4. When using the titanium plate, it must be operated strictly in accordance with the specifications, because there will be a pressure range and working temperature on the nameplate of the heat exchange unit. If the pressure or temperature is too high, it will cause the gasket to leak. Therefore, it is strictly forbidden to produce severe shocks during operation.

5. When the equipment is stopped, first slowly cut off the high-pressure side, and then slowly cut off the low-pressure fluid. why? Because it can reduce the pressure difference of the titanium plate, protect the titanium plate, and extend the life of the titanium plate.
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How is titanium alloy processed?

Since the discovery of titanium in 1790, mankind has carried out a century of painstaking exploration in order to obtain the special properties of titanium. In 1910, titanium was first manufactured by humans, but the application of titanium alloy processing was difficult and long. It was not until 1951, 40 years later, that industrial production was finally realized.

The development and application of titanium alloys in my country began in the 1960s.

Titanium alloy has the characteristics of high specific strength, corrosion resistance, high-temperature resistance and fatigue resistance. Titanium alloy of the same size only accounts for 60% of steel, but its strength is higher than that of alloy steel. Titanium alloys are widely used in medical fields because of their good properties, such as artificial joints, bone fixation devices, dentures, etc.

Titanium alloys are widely used in aircraft structural parts and heat-resistant parts. It is one of the main structural materials for modern aircraft and engines, and is called "space metal".

But titanium alloy is like a strong horse. It must be tamed to reach the goal of thousands of miles a day. So how can we "tame" titanium alloy?

Titanium alloy has poor thermal conductivity, high hardness and easy rebound. The difference in thermal conductivity is reflected in the heat generated by friction during processing. If it is other metals, it will quickly spread to the whole, such as the pot we usually use.

However, due to the poor thermal conductivity of titanium alloys, heat will continue to accumulate, making the titanium alloy sticky, making the tool brittle, severely worn and even damaged, just like cutting chewing gum with a knife.

Titanium alloys have high hardness, and aluminum alloy materials for airplanes are easy to process: one meter of titanium alloy materials can process 25 meters of aluminum alloy materials, which is economical, but the strength of aluminum alloys is difficult to meet the requirements. Therefore, although the processing of titanium alloys is more difficult , But it is still necessary. In addition, titanium alloy springback seriously affects the machining accuracy of parts, especially thin-walled complex parts.

Powerful milling, shallow cutting high-speed milling, etc. make titanium alloy parts processing faster and more stable. In order to tame these horses, we developed the superplastic forming method of titanium alloy sheet processing, the compressed air stirring of chemical milling treatment and the rapid welding method of small current.

Titanium alloy can be used in aviation equipment manufacturing. I believe that with the continuous research and exploration of the majority of scientific and technological workers in the aviation industry, our understanding of titanium alloys will gradually deepen. For the domestication of titanium alloys, we will have more means to make greater contributions to my country's aviation industry!
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