Glass Machining Manufacturing Processes 2

In oxidic glasses, both covalent and ionic bonds predominate. They generally dis­play strong polarisation, which also causes its characteristically brittle removal behaviour. Should material shifting lead to the fracture of these bonds, the struc­ture of glass is destroyed irreparably as opposed to metals, the free electrons of which can form new bonds. Figure 4-18 shows Read more

Between Centres Manufacturing Processes 2

Here, we must differentiate between two methods. In external cylindrical periph­eral plunge grinding (infeed grinding), the grinding wheel is arranged normally to the workpiece rotation axis, while in external cylindrical peripheral longitudinal grinding the grinding tool is moved equidistantly to this axis. Both grinding meth­ods generally work with up grinding. In up grinding, the vectors Read more

Natural Diamond Manufacturing Processes 2

Diamond is chemically pure carbon that crystallises as a natural product under ex­treme pressure and heat over a long period of time. About 80 % of natural dia­monds are rejected for use as decorative objects because of their small size and de­ficient purity, making them available to industry. Their properties are nearly identical to synthetic Read more

Grinding Manufacturing Processes 2

5.2 Preparation Grinding tools are not in a usable condition as delivered or after a longer period of use. Grinding wheels exhibit macrogeometrical faults (e. g. roundness deviation, waviness, macro-wear, loss of profile), which lead to problems in the grinding process or to deficient dimensional accuracy of the components worked upon. Mi­cro-wear, i. e. dulling Read more