Titanium Wire From Medical Devices To Aviation

The main uses of titanium wire include: welding wire, production of springs, rivets, etc. Widely used in aviation, marine, petrochemical, pharmaceutical and other fields.

1. Welding wire. Currently, more than 80% of titanium and titanium alloy wires are used as welding wires. For example, welding of various titanium equipment, welded pipes, repair welding of aviation jet engine turbine disks and blades, welding of casings, etc.

2. Due to its excellent corrosion resistance, titanium is widely used in chemical, pharmaceutical, papermaking and other industries. For example, Tianjin Chemical Plant uses 3.2mm pure titanium wire to prepare a filter.

3. Titanium and titanium alloy wires are used to manufacture fasteners, load-bearing components, springs, etc. due to their good comprehensive properties. For example, Xi'an High Pressure Valve Factory uses TC4 wire to make valve compression springs.

4. In the medical and health industry, titanium and titanium alloy wires are used to manufacture medical devices, implant crown fixation, skull fixation, etc.

5. Some titanium alloys are used to make satellite antennas and shoulder pads for clothes because of their shape memory function.

6. In the electroplating and water treatment industries, titanium and titanium alloy wires are used to make various electrodes.

Titanium wire and titanium alloy wire drawing is a metal plastic processing process in which the wire rod or wire blank is pulled out from the die hole of the wire drawing die under the action of the drawing force to produce small-section titanium and titanium alloy wire. Wires with different cross-sectional shapes and sizes of various metals and alloys can be produced by drawing. The drawn wire has precise dimensions and smooth surface, and the drawing equipment and mold used are simple and easy to manufacture. When drawing ultra-fine metal wires with a wire diameter less than 0.05mm, it is difficult to pierce the mold. In order to improve the stability of the drawing process, reduce the number of breakage and mold piercing, and improve the drawing production efficiency, the safety factor K value can be greater than 2.0.

Drawing above the recrystallization temperature is hot drawing, and drawing above room temperature and below the recrystallization temperature is warm drawing. Cold drawing is the most commonly used drawing method in metal wire and wire production. During hot drawing, the metal wire must be heated before entering the die hole. It is mainly used for drawing metal wires of high melting point metals such as tungsten and molybdenum. During warm drawing, the metal wire also needs to be heated to a specified range of temperature by a heater before entering the die hole for drawing. It is mainly used for drawing zinc wire and difficult-to-deform alloy wires such as high-speed steel wire and bearing steel wire.

According to the number of dies that the wire passes through at the same time during the drawing process, drawing that passes through only one die is single-pass drawing, and drawing that passes through several (2 to 25) dies in sequence is multi-pass continuous drawing. The wire speed of single-pass drawing is low, and the productivity and labor productivity are low. It is often used for drawing large wire diameter, low plasticity and special-shaped wires. Multi-pass drawing has high wire speed, high degree of mechanization and automation, and high productivity and labor productivity. It is the main method of metal wire and wire production. It is divided into non-sliding continuous drawing and sliding continuous drawing.

According to the state of the lubricant used during drawing, wet drawing uses liquid lubricants, and dry drawing uses solid lubricants.

According to the cross-sectional shape of drawn metal wires, there are round wire drawing and special-shaped wire drawing.

According to the pulling force acting on the wire being drawn, there are positive pulling force and reverse pulling force.

There are also special drawings, such as roller die drawing, etc.!

Process characteristics: The stress state of metal wire drawing is a three-dimensional principal stress state of two-dimensional compressive stress and one tensile stress. Compared with the principal stress state of compressive stress in three directions, the drawn metal wire is easier to achieve plasticity. deformed state.

The deformation state of drawing is a three-dimensional main deformation state of two directions of compression deformation and one direction of tensile deformation. This state is unfavorable to the plasticity of metal materials and is more likely to produce and expose surface defects. The deformation amount of each pass in the metal wire drawing process is limited by its safety factor. The smaller the deformation amount, the more drawing passes. Therefore, multi-pass continuous high-speed drawing is often used in the production of metal wires.

Common problems and solutions in metal wire drawing

In metal processing, external force is used to force carbon steel, stainless steel, aluminum, copper and other metals through the mold, and their cross-section is compressed into the required shape and size. This is our common wire drawing process. The drawing process is divided into dry drawing and wet drawing according to the equipment and lubricants used. This article briefly introduces common problems and solutions in wet drawing.

First of all, the choice of wet drawing process is generally for metal drawing with small diameter, surface finish, or subsequent processing technology that has special requirements. The main categories of wet pulling lubricants include pure oil, synthetic oil, emulsion, paste, etc. The selection of wet drawing lubricant is mainly based on many factors such as raw material material, mold, surface quality and downstream applications. For example, for commonly used stainless steel drawing, pure oil with higher viscosity and special extreme pressure additives is generally selected. For carbon steel, emulsion is generally selected. For non-ferrous metals, pure oil, synthetic oil, or emulsion can be selected according to the final application requirements. If you have special requirements, you can also choose ointment.

Generally speaking, in actual operation, various problems will occur regardless of dry or wet drawing process. Let's take a look at the common problems during wet drawing and their corresponding solutions.

1. Discoloration of wires

Surface discoloration of wires (such as copper) is mainly oxidative discoloration, which occurs due to improper temperature and humidity conditions. It may be that the concentration of the emulsion is too low or the temperature is abnormal; too much oil is attached to the wire; the water quality is substandard; foreign oil is mixed in, etc.

Once you find out the cause of its discoloration, you can take corresponding solutions based on the actual situation. For example, if the concentration of the emulsion is too low, raise it to the normal standard; if the temperature is abnormal, adjust it to the normal 35°C~45°C; check whether there is drawing oil overflowing at the outlet; remove foreign oil mixed in the emulsion, etc.

2. Mold wear is large

One of the causes of large mold loss is improper operation of the machine, and the other is incorrect selection of lubricant. If the machine is not running properly, the operator needs to practice continuously and check its working condition before each operation.

In addition, lubricant plays a key role in assisting and promoting the wire drawing process, and its selection is crucial. At present, wire drawing products from CONDAT are highly praised by many companies. On the one hand, it has a complete product series, which basically covers all wire drawing applications; on the other hand, VICAFIL? representative lubricant has the advantages of fast drawing speed, good chemical compatibility, and not easy to break, and can extend the use of the mold. life. Not only that, CONDAT can also customize lubrication solutions, being at the forefront of the wire drawing industry.

3. Broken lines, scratches and burrs

Broken wires, scratches and burrs greatly affect the aesthetics and quality of the product. The causes of these problems may be contamination of metal shavings caused by direct contact between the metal and the mold due to insufficient lubrication, clogging of the mold holes, or aging of the lubricant. Metal shavings can be removed through filtering equipment, blockages can be removed, and lubrication can be replaced. Agent measures to solve respectively.

4. Emulsion stratification/excessive surface precipitates

Microbial infringement, low pH, high water hardness and inorganic salts, and high emulsion temperature may cause emulsion stratification or excessive precipitates on the surface of the wire. Solutions must also be targeted.

If it is a microbial infringement, you can add bactericide and supplement sodium hydroxide solution or triethylamine alcohol; if the pH is too low, you need to supplement sodium hydroxide solution or triethylamine alcohol; when the hardness of the water used for preparing the solution and the inorganic salt When the temperature is too high, the water used for preparation needs to be replaced; when the temperature of the emulsion is too high, it needs to be cooled appropriately before use.
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