Engineer’s blue is mostly used in engineering industry, especialy in the production and repairs/maintenance of:
- moulds for plastics processing (injection, pressing)
- moulds for metal pressing
- beds, supports and slides of machine tools, forming/shaping machines or machinery
- journal bearings consisting of more components
The reason for using Engineer’s blue is detecting unevenness (bulgines, leakines) of contact spots that:
- • slide on each other (slides and supports/sliding bars in a machine tool) causing faster and higher abrasion of sliding parts. See Picture 1.
- • are-in-contact-with/bear-on each other (parts of a mould) causing more frequent and thicker flashes from mould seam line. These flashes cause higher material consumption in production. See Picture 2
Engineer’s blue is also used at repairs of worn-out large multipart journal bearings. See Picture 3.
Operation with Engineer’s blue:
The method of working with Engineer’s blue consists of one or more rounds of dashing it in thin layer upon the surface of a reference area (ruler, mating part). By touching the surface of a machined area with such prepared ruler, all elevated spots are marked. These elevations are than scrapped away using hand scrapers (Picture 4, Picture 5). After scraping, the machined area and the ruler are cleaned and the process repeats until both bearing areas (in case of moulds) or the areas that slide on each other during their operation (in case of support for machine tools or forming machines) get unified. This state is signaled by Engineer’s blue from the ruler beeing left evenly on most of he machined surface. In professional terms such surface is called a scraped one. See Picture 6, Picture 7.
Rulers are quite expensive and serve in this proces as a reference face/shape with very precisely machined surface – mostly linear for slides/supports/moulds. For the bearings, journal/shaft itself is used as a ruler.
Engineer’s blue is used in blue for steal/iron parts and yellow for plastic ones.
Disposal of Engineer’s blue:
Raw materials for making Engineer’s blue are the products of petrochemical industry that create a liniment base. A colour component is made mostly of the substances containing some of the metals bound in a complex organic set. In opposite to the regular Engineer’s blue which contains Prussian Blue, the one that we produce contains complex-bound copper. When disposing scraps the procedure is the same as for common colours containing less than 2.5 percent of copper.