The process of removing material from a piece of work by means of rotating abrasive wheel is known as grinding. Grinding wheel is mounted on the spindle and rotates on it. Metal is ground by the action of number of cutting edges coming into contact with the work piece.
TYPES OF GRINDING MACHINES
(a) External Cylindrical Grinding Machine
(b) Internal Cylindrical Grinding Machine
(c) Surface Grinding Machine
EXTERNAL CYLINDRICAL GRINDING MACHINE
This horizontal cylindrical moving table grinding machine range has been designed to fulfil the requirements of a wide range of applications that combine external, internal, face and taper grinding of components such as: transmission shafts, electric motor shafts, gas and wind turbine shafts, railway shafts, machine tools shafts, landing gear components, etc. Depending on the application corundum, CBN or diamond wheels can be used.
The machine base and sub-assemblies are made of stabilized pearlitic cast iron. HG grinding machines can be equipped with a wide range of wheelhead configurations: straight, angular and “B”-axis which is driven by an integrated torque motor. Wheels are assembled on hydrostatic bearing spindles,roller bearing or on DANOBAT designed electric-spindles.
In order to obtain the maximum machine performance HG machines can be equiped with in-process measuring systems, automatic wheel balancing system incorporating gap and crash, axial positioning system and taper correction, etc.
INTERNAL CYLINDRICAL GRINDING MACHINE
High precision ID machines for internal, external and face grinding, suitable for single part manufacturing and high volume production.
The ID can also incorporate spindle turret, measuring head and automatic loading system.
All machines are equipped with linear motors technology, ideal for non-round grinding.
Designed for the grinding of gear parts, cutting tools, bearings, non-round discs and hydraulic components.
SURFACE GRINDING MACHINE
Surface Grinding is a manufacturing process which moves or grinding wheel relative a surface in a plane while a grinding wheel contacts the surface and removes a minute amount of material, such that a flat surface is created. The term surface grinding designates any process which accurately processes or grinds a surface.
Surface grinding methods include: horizontal-spindle, vertical-spindle, vertical-spindle rotary grinding, horizontal spindle single disk, and vertical swivel head grinding.
Parts may require surface grinding for several reasons. The following are a few of the more common reasons:
- Produce a very flat surface.
- Very accurate thickness tolerance specified.
- A very smooth surface roughness Ra is specified/required.
- Cutting tool sharpening
Surface grinding machines and processes where first developed to to manufacture very tight tight tolerances, smooth surface finishes, and removing material from very hard materials
CLASSIFICATION OF GRINDING MACHINES
These machines are classified by the type, size of machine and special features as specified by the manufacturers.
PURPOSE OF GRINDING MACHINES
The purpose of grinding machine is:
(a) To shape hard steel or metal which cannot be machined.
(b) To obtain high degree of surface finish.
(c) To obtain high degree of dimensional accuracy.
(d) To overcome the inaccuracies in the previous machined surfaces.
(e) To sharpen cutting tools.
(f) To give correct geometrical shape to a product.