The molybdenum tube is well resistant to high temperature and can be used in a vacuum environment for more than 4 thousand hours at 1800 degrees. Molybdenum tube is widely used in electric vacuum industry, which can be used as a heating pipe, high-temperature environment cooling tube, high-temperature environmental protection tube, etc. Large molybdenum tubes can be used as ring targets, furnace gallbladder, small molybdenum tube instrument parts.
The types and processing of molybdenum tube: deep hole drilling pipe, sintered molybdenum sheet, welding molybdenum tube drawing. Sintered molybdenum tube, mainly used for smelting equipment, furnace tube, annular target, vacuum heating room, the maximum size can be 1200mm in diameter; welding molybdenum tube size strict requirements for equipment spare parts, adopt the vacuum welding, the use of size is not too large, a diameter of 8-500mm; drawing molybdenum tube the complexity of the production process, for the production of small molybdenum tube, diameter of 1.0-6mm.
Because of the hard and brittle properties of molybdenum, molybdenum is difficult to process metal. I have been engaged in molybdenum and tungsten processing for many years. Now I have talked about my understanding of the processing of molybdenum and tungsten.
Molybdenum and tungsten are produced by powder metallurgy or vacuum melting, and then the slab, strip, foil, tube, rod and wire for processing parts are produced by plastic processing technology. The following points should be noted for the successful processing of these materials into parts needed for industry.
First is the tool, molybdenum alloy YG8 can be selected. Molybdenum material is rigid, strong binding and difficult to deform. When turning, the sharpening knives should be sharpened, and the front and back edges of the knives should be very smooth, with a slight increase of the rake angle, then a medium speed cutting speed and a larger amount of feed are selected. Generally, the cutting fluid is not used. The thread is a focus of molybdenum processing, do well the key is patience, careful grinding knife, and the sharp angle is the key, moderate speed, small feed, concentrate, repeatedly, in place after the fine lines triangular file down speed burr, ensure smooth mouth. The molybdenum seed crystal chuck requires a high degree of concentricity. In the process of processing, more attention should be paid to the concentricity.
There are 5 basic conditions for the processing of molybdenum sheet, namely, reel, twist, bending, stamping and perforating. When bending, the bending axis should be perpendicular to the direction of the main ligation, and the small workpiece is selected as a cross - made board. The stamping of molybdenum parts requires very high accuracy. Because molybdenum is not easy to deform, it should be heated when processing, adjusting the stamping speed, making it fit with the deformation speed of molybdenum. This is based on the degree of specific deformation.
Deep hole tapping of molybdenum, due to molybdenum having high wear resistance, general tapping dozens of all nut taps will wear in the replacement, when punching hole is slightly larger than the standard, the need to control, ensure the thread height of not less than the standard 70% speed mechanism, medium speed, otherwise it will make the parts breakdown.
Due to the high hardness and friction of molybdenum, in cutting or drilling pin when the cutting surface will produce high temperature to form hard points, such as the operation will make a serious tool wear annealing, appears in a timely manner on the blade coated some oil will solve.
In the process of rolling, tungsten forging, turning, drilling, grinding will produce metal dust inhalation of the body will do great harm, so we must first protect themselves when processing rare metal hard under this condition.
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