Хонинговальные головки

6.6.1 Technological Dimension Tool wear and conditioning are important factors for the tool user as they define product quality, grinding forces, maximum material removal rate and auxiliary times. Grinding tool performance impacts workpiece dimensions and surface integrity. Tool manufacturers are able to generate desired tool capabilities within a certain range, but the tool use also […]

Chemical reactions arise from the reactivity between the system components. Therefore, low chemical reactivity between all system components including grits, tool bonding, workpiece material, cooling lubricants and their additives is favored (Fig. 7.29). In addition, low mechanical pressure slows down chemical reactions as does low heat, which has been tackled earlier. Brinksmeier and Wilke [BRIN04] […]

Yan et al. [YAN12] invented a bamboo charcoal composite that has vascular bundles as pores and is coated with abrasive particles in a metal bond layer around the vascular bundles. The advantage is claimed to be an easy fabricating process with low cost and high quality; the abrasive tool can be used for polishing oper­ations […]

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 […]