- Author
-
Isaksson, S.
|
Milovancevic, M.
- Title
- Skydd av industrins verktyg vid brand. [Protection of Industrial Tools in Case of Fire.]
- Coporate
- Swedish National Testing and Research Inst., Boras, Sweden
- Report
-
SP REPORT 1995:74,
1995,
46 p.
- Keywords
-
industries
|
fire damage
|
material properties
|
heat flux
|
risk assessment
- Identifiers
- moulds; pressing tools; cutting tools
- Abstract
- [ONLY ABSTRACT IN ENGLISH] Different types of highly specialised shaping tools are frequently used in industrial production for example of a simple plastic pencil on your desk, parts of advanced electronic equipment or vehicle parts. The concepts of lean production and just-in time delivery of production parts have made industry more vulnerable to distrubances in the supply of components. The manufacturing of a tool is a time consuming effort lasting from one month up to several months. A general maximum temperature level where no damage will occur has been set to 200 ºC. If a tool is heated above its tempering temperature, a change in material properties will occur. If the tool is heated also above its hardening temperature it will for certain have substantially altered properties. The distortion of a tool is governed by the shape of the tool, and if the heating or cooling is non-uniform. Full scale fire tests have shown that in pre flashover conditions a low positioning of a tool gives a good protection against excessive heating for at least 20 minutes. Tools in rack storage may be directly involved in the hot smoke layer, and quickly reach dangerous temperature levels. A simple protection system consisting of a sheet metal box prolings time to damage considerably, even after flashover. The box will also offer protection against non-uniform cooling and corrosive contamination. The study also contains information on heat flux measurements that can be used for more detailed assessment of the risk for delicate pieces of equipment that need special attention.