How to choose cleanliness equipment and cleanliness agents for auto parts

In the process of metal processing, the cleaning process of parts cannot be ignored. How to choose excellent cleanliness equipment and cleanliness agents? This is an important question that companies must consider.

The market demand of the automobile industry is huge. With the development of technology and the improvement of environmental protection requirements, in the production process of auto parts, the parts cleaning process also puts forward higher requirements for cleanliness equipment and cleanliness agents.

1.Common cleanliness equipment

Commonly used cleanliness equipment includes: immersion cleaning, spray cleaning, high-pressure spray cleaning and ultrasonic cleaning equipment. Immersion cleaning generally cleans parts with multiple chambers, which requires a strong cleaning ability of the cleaning agent. The defoaming performance of the cleaning agent is not high, but the cleaning agent is required to have a certain ability to emulsify miscellaneous oil, so as to ensure zero After the part is cleaned and removed from the cleaning agent, its surface will not be re-contaminated by the cleaned-up trash oil. The disadvantage of the cleaning agent with strong emulsifying miscellaneous oil ability is that the cleaning ability of the cleaning agent gradually decreases, resulting in a shorter service life of the cleaning agent.

Spray cleaning is also widely used. The cleaning of automotive transmission parts mostly adopts a through-type spray cleaning machine, which is generally divided into three processes: cleaning-rinsing-drying, which vary according to process requirements, cleaning-cleaning-rinsing-drying or cleaning-rinsing-rinsing-drying Dry. The spray cleaning machine is equipped with an oil skimmer, and the use of a cleaning agent with a strong ability to resist miscellaneous oil can improve the service life of the cleaning agent. The transmission parts to be cleaned are generally made of forged steel, and the dirt on the surface of the parts is mostly low-viscosity cutting fluid. When selecting a cleaning agent, the cleaning ability and the defoaming ability of the cleaning agent should be considered. As the temperature rises, its decontamination ability also increases, but after a certain temperature, the decontamination ability decreases instead. When recommending a cleaning agent, an optimum temperature range should be considered. On the other hand, since the concentration of rinsing cleaning agent is generally low, ranging from 0.5% to 1.5%, the cleaning agent is required to have better antirust ability.

High-pressure spray cleaners are mostly used to remove dirt on the surface of parts and burrs on the metal surface. Positioning and fixed-point spraying methods are often used for parts. The cleaning agent is required to have a good ability to resist foam under high pressure.

In ultrasonic cleaning, due to the cavitation effect of ultrasonic waves, its cleaning effect is far superior to other traditional cleaning methods, and the cleaning effect that can be achieved is very good. Ultrasonic cleaning is mainly used for precision parts or parts with complex geometric shapes, such as plungers of fuel injection pumps and injectors, precision transmission parts, high-precision bearings, paint pre-treatment in the automotive industry, pre-plating treatment in the electroplating industry, vacuum The pre-plating treatment of ion plating, etc., are increasingly inseparable from ultrasonic cleaning machines.

2 General requirements for metal parts cleaning

The general requirements for metal cleaning of auto parts are as follows: the cleaning speed is fast, and the dirt on the metal surface can be completely removed within the cleaning time set by the cleaning machine process; it is non-corrosive to the cleaning machine and the parts to be cleaned; the cleaning agent is low in cost, Environmental protection, mild smell; during the cleaning process, no insoluble matter remains on the surface of the cleaning object, no new dirt is generated, no new covering layer harmful to the subsequent process is formed, and the product quality is not affected.

When an engineer recommends a cleaning agent to meet the process requirements, a trade-off must be made among many factors such as cleaning equipment and cleaning methods, cleaning parts materials, types of dirt on the surface of parts, the next process, water quality, and workshop environment.

3 Choice of cleanliness agent

Under some specific process conditions, when recommending cleaning agents, the impact of subsequent processes must be considered. For example, in a certain transmission shaft and gear production process: gear grinding-spray cleaning (intermediate cleaning)-shot blasting-spray cleaning (final cleaning) ), the cleaning process in the middle of spraying should consider the next shot peening process. After the cleaning agent cleans the parts and dries them, there should be no sticky cleaning agent residue or covering film on the surface of the parts, otherwise it will affect the shot peening process and cause quality defects.

We all know that the cleaning agent is mainly used to remove cutting fluid, grinding dust and metal particles on the surface of the workpiece, and provide short-term anti-rust effect. The anti-rust ability of general cleaning agents is not enough to ensure anti-rust between processes under high humidity and high temperature workshop conditions, especially in summer workshops with high humidity and high temperature.

With the advancement of technology and the introduction of environmental protection requirements, new, efficient, professional and environmentally friendly cleaning agents must be the trend of future development. In the metal processing industry, according to the characteristics of metal materials, the cleaning agent is no longer purely for decontamination. For example, the cleaning agent is required to effectively decontaminate and at the same time play a role in preventing rust on the metal film and enhancing the corrosion resistance of the product. ability, etc., which puts forward higher requirements for the additives added in the cleaning agent.

A well-known compressor manufacturer had the problem of parts rusting soon after cleaning during its processing. It replaced the cleaning agent product with ultra-low foam and high anti-rust ability. After trial according to the supplier's management and maintenance plan , to meet the anti-rust requirements between processes