Хонинговальные головки

Substituting s = jm in Equation 19.76, it is possible to solve the characteristic equation to find the unstable limit frequencies and the corresponding limits of grinding force stiffness at the threshold of instability. Noting that m = n. Q., the frequencies are given by where A and B are the real and imginary parts […]

The dynamic compliance of the mechanical system, which consists of the workpiece, the grinding wheel, and the grinding machine, is represented by and u = cosacos(a — в) where a is the angle between the direction of the depth of cut and the direction of the natural frequency mode of the mechanical system, в is […]

An important group of cooling lubricant additives are polar additives, whose molecules contain polar groups (Figure 10.2). Polar additives are mostly unsaturated hydrocarbon compounds such as fatty acids, fatty alcohol, and fatty acid esters. Due to their polarity, these agents firmly deposit on the workpiece surface and form an adhering lubricating film. Additionally, there are […]

The majority of sensors are capable of measuring the macrogeometrical features. Any kind of mechanical contact of a sensor with the rotating grinding wheel causes serious problems because the abrasives always tend to grind the material of the touching element. Only by realizing short touching pulses with small touching forces and by using a very […]

Malleable cast iron is produced by controlled annealing of white iron to produce round graphite nodules. The material is ductile, tough, and has good machinability, but grindability is lessened by a tendency for wheel loading. 13.2.3 Nodular or Ductile Cast Iron Nodular ductile cast iron has the carbon in the form of round graphite nodules […]

A detailed discussion of machine tool design is beyond the scope of this book. The following sections highlight some important features in the design and construction of grinding machines and their elements. For a more detailed discussion, there are publications dedicated to this field such as Slocum [1992]. 15.1 THE MACHINE BASE 15.1.1 Introduction The […]

Ac servomotors are a class of induction motor modified for servo-operation. It is an asynchronous motor consisting of a stationary ac transformer (stator) and a rotating shorted secondary circuit (rotor) that carries an induced secondary current. The rotor consists of laminated iron cores with slots for conductors. Torque is produced by the interaction of the […]

Figure 15.41 shows the heavy-duty hydraulic plunge dresser with sleeve and thrust bearings as in the previous example. Custom coolant porting is provided, and easy spindle removal is possible from the housing for roll changes. This unit is typically used for dressing multiple wheel assemblies. 15.17.7 DFW-HTG H eavy-Duty Hydraulic Spindle The unit shown in […]

The advantages of creep feed grinding are shorter machining times, lower surface roughness, improved profile, and dimensional accuracy [Minke and Tawakoli 1991]. In industrial mass production, there are two fields of application of creep feed grinding in which high cutting performance and high component quality are required. In mass production, creep feed grinding is used […]

Double-disc grinding is a high-production, high-accuracy processing for parts with flat and parallel sides. Two opposed grinding wheel discs mounted on separate spindles simultaneously grind opposite and parallel faces on components fed between them by a variety of techniques. Double­disc grinders can be configured in either a horizontal or vertical configuration referring to the axis […]