Diamond tools applications

TABLE 9.7 Compax Diamond Tool Application Guidelines... 

To overcome this drawback, capillary sectorial fibres (Figure 11) were fabricated31. In this case part of the preform ground to the designed shape was inserted into a circularly symmetric silica tube and drawn. The active length of the sensor is defined by the distance between the input and output of the analyte produced in the capillary wall by special diamond tools. Despite promising results achieved, difficulties in the application of sensitive layers on the core surface remain a drawback of this kind of fibres and the... 

Sintered polycrystalline diamond tools are much more expensive than conventional cemented-carbide or ceramic tools because of the high cost of the processing technique and the finishing methods used. Diamond tools, however, are economical on an overall-cost-per-part basis for certain applications because of long life and increased productivity. 

Cutting Tool Application of Chemical Vapor Deposited Diamond... 

Applications of Diamond Tools. Most industrial machining operations are performed with coated cemented-carbide tools, usually as indexable inserts. Diamond (and PCD) increasingly competes with these materials, in particular in the machining of non-ferrous metals such as aluminum, copper, magnesium, lead, and theiralloys since it does not react chemically with these materials. 

Today, an estimated 20,000 kg/year (or —100 million carat/year 1 carat = 0.2 g) of cBN powders is mass produced in high-pressure factories and used mostly for mechanical applications around the world (Fig. 54) (340,341). Cubic BN tools are used to grind and to cut hardened steel or chilled cast irons, for which diamond tools are not usually applied. Use of cBN tools has been growing in parallel with the growth of hard Fe-rich materials, in order to fulfill the requirements for precise finishing and high productivity of these materials in automated... 

An alternative to the measurement of the dimensions of the indentation by means of a microscope is the direct reading method, of which the Rockwell method is an example. The Rockwell hardness is based on indentation into the sample under the action of two consecutively applied loads - a minor load (initial) and a standardised major load (final). In order to eliminate zero error and possible surface effects due to roughness or scale, the initial or minor load is first applied and produce an initial indentation. The Rockwell hardness is based on the increment in the indentation depth produced by the major load over that produced by the minor load. Rockwell hardness scales are divided into a number of groups, each one of these corresponding to a specified penetrator and a specified value of the major load. The different combinations are designated by different subscripts used to express the Rockwell hardness number. Thus, when the test is performed with 150 kg load and a diamond cone indentor, the resulting hardness number is called the Rockwell C (Rc) hardness. If the applied load is 100 kg and the indentor used is a 1.58 mm diameter hardened steel ball, a Rockwell B (RB) hardness number is obtained. The facts that the dial has several scales and that different indentation tools can be filled, enable Rockwell machine to be used equally well for hard and soft materials and for small and thin specimens. Rockwell hardness number is dimensionless. The test is easy to carry out and rapidly accomplished. As a result it is used widely in industrial applications, particularly in quality situations. 

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