Regarding the safety hazard of 3D printing of metal powder, 3D Science Valley has published the article "Safety of Metal 3D Printing, Some Safety Factors You Need to Understand", analyzing the risks in the use of powders and inert gases, the risk of fire and explosion. The risk of dust inhalation and exposure, the risk of inert gas suffocation. So how to effectively prevent these risks? In this issue, 3D Science Valley and Guyou have come together to understand the issues that need to be taken care of from the prevention of prevention equipment and metal 3D printing processing.
Risk 1: Fire
The key to preventing fires is to remember the three elements that trigger the fire ("fire triangle"): fuel (metal powder or soot), ignition source (laser or spark) and oxygen. Although these metal printing devices are designed to produce laser and metal powder contact in an inert gas environment, it can be said to operate in a safe manner. However, as an operator, any ignition source environment should be avoided when handling dust or soot. This is because two of the three elements have been met: fuel (powder or soot) and oxygen (in an open environment). Care should be taken to eliminate the underlying risks (including possible ignition risks such as smoking), and the main risk is electrostatic discharge (ESD), so some of the necessary protective equipment, including anti-static wrist straps, is an effective way to avoid accidents.
Knowing the life cycle of the powder also helps to prevent the risk of accidents. The powder is transported to the processing site in tank-type packaging and finally collected as recycled powder (mostly powder) or as waste recycling. It seems quite complicated, but it must be understood and followed by the entire environment of the powder: the powder trapped by the product, the powder to be recovered, the soot and powder trapped in the filter, and the accumulated accumulation on the glove. Powder. In addition, the internal hose and shaft also accumulate powder, and all deposited powder needs to be processed regularly.
Some basic safety measures should not be ignored. Always wear gloves, goggles and protective clothing (laboratory jacket) when using the machine. Even the simplest tasks like using a keyboard and mouse require safety.
There are at least a few measures that can be taken to protect life and prevent fires:
Personal protective equipment (PPE)
PPE is a self-defense protection method. If a fire occurs, it can effectively protect life and safety. According to the budget, different levels of protective equipment can be configured:
- Protective clothing: If using active metal, you can use a lab coat, cover arms, protective gloves, anti-static belt
- Standard PPE: respirator, nitrile gloves, mask, anti-static strap
- Extended PPE: standard PPE PLUS, fire rated kit, fire resistant gloves
Extinguishing
There are several methods of extinguishing fire, but it is clear that water and carbon dioxide are unsafe choices for metal fires. When extinguishing a fire, a metal fire requires a Class D fire extinguisher, a fire extinguisher rated for metal fire. It is important to note that water can be dangerous for metal fires and requires a professional fire brigade to make the best decisions.
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