Common problems and solutions in the cleaning process of powder metallurgy products

Common problems and solutions in the cleaning process of powder metallurgy products

The common problems and solutions in the cleaning process of powder metallurgy products are the content to be shared with you today. Let's take a look.

1. Rust prevention:

Due to the porous structure of powder metallurgy, the first problem is the rust prevention after cleaning. As for the cleaning medium, kerosene or white oil is generally used at this stage, and the latter has better antirust performance than the former. However, due to the large tension, there are certain requirements for ultrasonic power and density, and ordinary ultrasonic transducers cannot match the cleaning requirements of parts with oily media. The water-soluble cleaning medium has good cleaning brightness, but the dehydration and rust prevention process must be added, otherwise the parts will easily rust from the inside out in the future, affecting the quality of the finished products. In addition, vacuum hydrocarbon ultrasonic cleaning equipment has appeared on the market at present, which can avoid corrosion. However, since hydrocarbon solvents are mostly imported from abroad and volatile, the cost needs to be calculated comprehensively.

2. Uneven cleaning effect of parts:

As far as the equipment structure is concerned, the mechanical arm type and crawler type ultrasonic cleaning equipment are widely used on the market. Both can adopt PLC programmed preset cleaning process, but there are problems such as unreasonable design of cleaning tooling, too wide ultrasonic radiation surface, etc., which lead to uneven cleaning effect of parts at different levels, and require manual secondary treatment. Since there are a large number of fine particles left on the surface of powder metallurgy products after pressing and sintering, the ideal cleaning method is to increase the throwing process or keep the parts slightly rolling during the acoustic radiation process, so as to effectively shake off the particles that have been cleaned and peeled off;

The spiral drum type fully automatic ultrasonic cleaning machine has unique effect for cleaning small and medium-sized powder metallurgy gear parts, parts and other products. As the parts keep rolling and rotating slowly in the cleaning process, ultrasonic can effectively radiate to each plane, which solves the problem of uneven cleaning. At the same time, particles continue to roll and fall during this process, which completely solves the defects of traditional cleaning methods. As for the collision of parts, due to the adjustable rotation speed of the drum, the parts are always at the bottom of the drum and pushed out through the helix. Except for the polished parts with special requirements, the general structural parts and gear parts will not be damaged, especially for the quenched powder metallurgy parts.

3. Pay attention to the maintenance and cleaning of the equipment:

During cleaning, special attention should be paid to the maintenance and cleaning of the equipment. Many ultrasonic equipment have obvious cleaning effects at first. After a period of use, the acoustic radiation is greatly attenuated due to the accumulation of particles, which affects the stability of parts cleaning. The equipment shall be equipped with a self-cleaning system to keep the medium pure through filtration circulation and powder separation device, thus reducing the ultrasonic working pressure and ensuring the stability of cleaning.

To sum up, the problems and solutions encountered in the cleaning process of powder metallurgy products have been told to you. I hope this article will help you. If you need more information, please pay attention to the official website of zhongwei Precision.