Хонинговальные головки

SiC reacts heavily with many Al2O3 containing vitrified bonds leading to grit damage [TYRO03b]. Therefore, special bond types for SiC are applied. Silicon carbide is known for wearing mainly by splintering in the medium FEPA size ranges. Instead of steady and slow wear by adhesions, abrasion or chemical mechanisms, SiC wears by breaking into bigger […]

New coatings based on silicon dioxide or silane are modified to have hydrophilic or hydrophobic properties [KUNZ91, SETH11]. The coatings repel infiltration of cooling lubricant between grit and bond and therefore protect the resin bond [KLOC05a, p. 25, MARI04, p. 377]. Corundum grits can be coated with silane to optimize their performance in some resin […]

The ecological hazard of abrasive grits themselves is minor (Table 2.8 left), but some problems arise from the grit production emissions and waste. Emissions from the production of conventional abrasive grits are likely to consist primarily of particulate matter (PM), and carbon monoxide (CO) from the furnaces [EPA94]. In the sintering process of SiC from […]

In vitrified bonded wheels, the natural packing of the abrasive particles leaves certain porosity [DAVS04]. Additional pore builders produce higher porosity when they sublimate or burn off during the sintering process. Pore builders are typically either hollow particles or fugitive materials [MARI07]. Hollow particles such as hollow ball corundum, glass beads, or mullite maintain a […]

Gear grinding is distinguished into generating grinding and profile grinding as well as continuous and discontinuous grinding [KARP08]. Generating gear grinding generates the gear shape mainly by the complex process kinematics, profile gear grinding mainly through the grinding wheel profile (Fig. 4.2). The grinding tools have to withstand long contact lengths. The contact length in […]

There is little information available about the re-use of abrasive grits. Especially for the expensive superabrasives, recycling is important under the growing awareness of material and energy efficiency. McClarence [MCCL10b] estimated in 2010 that only between 8-10 % of new diamond is reclaimed. 4.8.3.1 Conventional Tools Conventional grinding wheels can be crushed and backfilled in […]

Important mechanical characteristics are tool hardness, density, and elasticity [KUEN98]. The mechanical properties of grinding tools result from their inho­mogeneous structure [QUIR80, p. 6]. Grinding tool hardness is defined as resistance of abrasives to be pulled out, so hardness is a property of the whole tool not single components [DECN70]. Tool hardness is proportional to […]

In most industrial applications, wheel wear is assumed from workpiece profile deviations. In research settings, wheel wear is commonly determined by repro­ducing the rotating grinding wheel into a steel plate. The grinding wheel needs an unworn reference part such as a part of the abrasive layer that did not interact with the workpiece. Karpuschewski [KARP01, […]

In 1822, grinders did not become old:. About thirty years ago, the steam engine was first adapted to the purposes of grinding; and then a very important era arrived in the annals of the grinder. He now worked in a small low room, where there were ten or twelve stones; the doors and windows were […]

An important requirement is being cost-effective. For this, the time-dependent costs, scrap rate, tool costs and auxiliary costs need to be low (Fig. 7.30). Time-dependent costs come from the processing time and dressing time (Figs. 7.3, 7.4 and 7.31). Processing time can be reduced by a high material removal rate either by more effective chip […]