Here.Contamination."I am making a note about the
What is contamination in mechanical design?Abbreviation for Contamination and refers to foreign matter or impurities that get mixed in with the product or inside the machine.The presence of these items causes various problems such as poor machine performance, breakdowns, and poor product quality, and is therefore considered a very important control item in machine design.
Specific examples of contamination
There are many different types of contamination that can cause problems in mechanical design.
- a solid body
- Metal powder and swarf:Microscopic metal particles generated during the machining of parts.
- Abrasion powder:Particles generated by wear of sliding parts of machines (bearings, gears, etc.).
- External intrusions:Dust, sand, fiber waste, etc.
- Carbide of resin:A black spot formed by the deterioration of resin in injection molding and other processes.
- liquid
- Moisture:Moisture in the air condenses or enters from the outside and mixes with hydraulic fluid or lubricating oil.
- Heterogeneous oil:Mixing of different types of lubricants and hydraulic fluids.
- gas
- Air:Air bubbles in hydraulic systems, etc. (air entrainment).
Problems caused by contamination
The presence of contamination can have serious effects on the machine, including
- Accelerated wear and chain:When contaminants get into the crevices of precision sliding parts such as hydraulic equipment and engines, they damage the surfaces of the parts and accelerate wear. Furthermore, this wear generates new contaminants (wear particles), which in turn cause further wear, leading to a "chain of wear.
- Failure to operate:Contamination clogging the valve gaps can cause hydraulic and pneumatic equipment to fail to operate properly.
- Reduced performance and shorter life span:When moisture or air gets mixed in with the lubricating oil, it reduces the oil's lubricating and cooling performance, hastens the deterioration of parts, and shortens the life of the entire machine.
- Poor product quality:Foreign matter in resin products can cause appearance defects and insufficient strength, and in food and pharmaceutical production lines, it can be a serious problem that threatens product safety.
Contamination control at the design stage
To prevent such problems,The concept of "contamination control" is important to manage contamination from the machine design stage The result will be the following. The designer will incorporate into the design measures to prevent contamination from occurring, entering, and remaining.
- Installation of filters:Filters of appropriate performance are placed in the path of hydraulic and lubricating oils to capture contaminants.
- Selection and placement of seals:Select appropriate sealing materials and place them in effective locations to prevent the intrusion of dust and moisture from the outside.
- Material Selection:Select materials that are not prone to wear in the first place, or use rust-resistant materials.
- Design of tanks and piping:In designing a hydraulic oil tank, make sure it is designed to allow contamination to settle easily and provide an air vent.
- Easy to disassemble and clean:Consider a structure that is easy to disassemble and reassemble for easy internal cleaning during maintenance.
Thus, contamination is not just "garbage" but an important technical issue that determines machine reliability and product quality,Should be considered from the earliest stages of design The first two are the following.
That's it.