Хонинговальные головки

In centreless external cylindrical peripheral longitudinal grinding, there is a larger number of parameters, as can be seen in Fig. 6-56. The workpiece can sometimes have cranks of smaller diameters that are not to be ground and is characterised by the main dimensions and stock allowance z. To reduce the workpiece stock allowance, the grinding […]

Not only the workpiece, but also the tool is subjected to high temperatures and pressures in the contact zone. The result of this is microscopic wear in the grit and the bond (Fig. 2-12). Grit wear begins in the crystalline layers lying near the surface of the grit. Ex­treme pressures and temperatures initiate oxidation and […]

According to DIN 69 111, grinding components with bonded abrasives are com­prised of straight, conical, and reduced grinding wheels, abrasive cutting discs, grinding wheels affixed to support discs, cup grinding wheels, bent grinding wheels, grinding segments, mounted points, honing stones and oil stones (Fig. 3­10). Ignoring form and dimensions, all of these types exhibit the […]

4.1 The Concept of “Machinability’’ in the Grinding Process Machinability is understood as a property of a material that allows for chip re­moval under given conditions. It thus describes the behaviour of a material during chip forming. The machinability of a material must always be considered in conjunction with the machining method, the tool and […]

4.6.1 Construction and Structure The specific properties of these materials, adapted to the respective field of appli­cation, are essentially contingent on chemical composition, possible cold forming and the heat treatment method. Corresponding to their most important alloying elements, nickel-based alloys can be subdivided into the following main groups [DIN42, DIN43, DIN44, DIN45, EVER71]: I. nickel-copper […]

5.3.1 Cooling Lubricant Type The various cooling lubricants exhibit characteristic properties and also influence the process parameters and its output. Varying friction conditions affect the cut­ting edge application. In the following, the influence of the cooling lubricant on the cutting forces, heat, surface quality and grinding wheel wear will be demon­strated. For smaller chip thicknesses, […]

One important variable in dressing with rotating dressing tools is the dressing speed ratio qd, defined as the ratio between the peripheral speed of the dressing roller and the peripheral speed of the grinding wheel, as shown in equation 6-9. For down dressing, this value is positive, for up dressing it is positive. From the […]

3.1 Grit Material In grinding material removal is caused by the interaction of the grit material and the target material. The following demands are placed on the abrasive grit mate­rial: • A high degree of hardness and toughness in order to facilitate chip formation and to maintain cutting edge sharpness over a longer period. • […]

The volumetric portion of grit VG, of bond VB and of pores VP of the total volume of the grinding component V is described by the equation v = V* + v, + Vp (3.5) If the individual columns are referred to the total volume V of the grinding component, we obtain the so-called structural […]

Materially speaking, the machinability of steels is determined by its structure and mechanical properties (hardness, tensile strength). Of primary importance for the composition and thus for the mechanical properties as well are: • carbon content (C-content), • alloying elements and • heat treatment. The percentile amounts of carbon or other alloying elements given in this […]