Medical titanium rod There are many other degreasing methods on the surface. For example, when the workpiece is too large, local surface treatment (such as coating, etc.) or there is no degreasing equipment, a simple brush can also be used for degreasing. When wiping and degreasing, use a brush or rag to dip lime slurry, magnesium oxide, cement, soap solution, tile ash, plant ash, sodium carbonate and metal cleaner Wipe the surfactant and detergent back and forth to remove the oil. Sometimes the oil can be completely removed after wiping once and then wiping again with degreasing fluid.

The drum degreasing for titanium rod processing is to place small parts with simple shape, such as standard parts, together with wood chips, soap pods and weak alkaline solution, seal them, and roll them at a speed of 60~100r/mhi for degreasing. Ultrasonic cleaning is to use the so-called ultrasonic wave (exceeding the frequency perceived by the human ear) with high frequency sound waves above 16kHz for cleaning and degreasing. When the ultrasonic wave is emitted into the liquid, the pressure will be reduced at a certain moment, and then the compression force will be generated at the next moment, and so on. When decompression occurs, there will be a vacuum space in the solution, and the solution vapor (water vapor, degreasing agent vapor) and dissolved gas in the solution will flow into the solution and form bubbles. At the moment after the bubble is generated, due to the compression force, the bubble is crushed, and the shock wave is generated due to the flying. This shock wave can cause the oil stain on the surface of the workpiece to separate from the workpiece.

When bubbles are destroyed, they can produce thousands of degrees of high temperature and hundreds of thousands of kilopascals of pressure. Ultrasonic cleaning is to use the destruction of shock wave on oil film and the intense stirring effect of cavity phenomenon. The sound pressure generated by the reflection of ultrasonic wave is also the reason for stirring the solution.

The ultrasonic generator is composed of an oscillator and a vibrator. There are two types of vibrators: throw in type and external attached type. When the cast in type is adopted, the vibrator shall be placed at a very effective position in the groove. A higher frequency is used when the workpiece is small, and a lower frequency is used when the workpiece is large, generally about 30kHz.

Ultrasonic can be used for solvent degreasing, electrolytic degreasing, chemical degreasing and pickling, which can greatly improve its efficiency. Its disadvantage is that it spreads in a straight line, and it is difficult to reach the shielded part. Therefore, the workpiece should rotate or turn over in the groove. When the basket is used for oil removal, the mesh is small, which has a large shielding effect on Zhao acoustic wave, and the strength attenuation is severe; The mesh is large, and parts are easy to be missed. At this time, the bottom irradiation mode should be adopted, that is, 0.1~0.4cm thin plate without holes should be used as the bottom plate, so that the ultrasonic wave can penetrate the bottom plate and reach the Q temperature on the workpiece. When the temperature is too high, too many bubbles will be generated, which will hinder the transmission of ultrasonic wave. For pure water, the best washing capacity is achieved at 501. For degreasing fluids with different compositions, the best temperature should be found through tests.

The suspended particles in the solution vibrate under the action of ultrasonic wave, which will produce agglutination. On the one hand, it is conducive to degreasing, but on the other hand, it is easy to make pollutants attach to the workpiece surface again. Therefore, it is recommended to use continuous filtration equipment with oil absorption materials for solution filtration. High degreasing concentration will affect the transmission of ultrasonic wave and reduce its effect. Therefore, it is necessary to determine the best concentration and ratio through tests.

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