Search This Blog

Monday, 25 November 2013

Types of Grinding Precision Grinding Machines

Types of Grinding Precision Grinding Machines Points : Types of Grinding Precision Grinding Machines, Cylindrical Grinders, Plunge-cut Grinders, Form Grinders, Surface Grinders, Center-less grinders, Internal grinders, Grinding machines are designed principally to finish parts having flat, internal surfaces or cylindrical surfaces. The type of surface machined largely determines the type of grinding machines used; thus a machine grinding cylindrical surfaces is called a cylindrical grinder machine designated for some special function, such as off-hand grinding, tool and cutter grinding or cutting off are designated according to the type of operation they performed.
Precision grinders may conveniently be classified in the following groups.
1. Cylindrical Grinders In these the abrasive Wheel grinds cylindrical, or modified cylindrical, surface as a reciprocating worktable, actuated by a traverse feed, draws the work, longitudinally across the face of the wheel. The following types are common.
(I) Plain cylindrical grinders (ii) Roll grinders
(iii) Piston grinders (traverse type) (iv) Universal grinders
2. Plunge-cut Grinders In this group of grinders, the abrasive wheel grinds cylindrical, or modifications of cylindrical, surfaces when the wheel head, actuated by an in feed, moves into the rotating work. Among these the following types.
(i) Ordinary plunge cut grinders (ii) Crankpin grinders
(iii) Piston grinders (plunge-cut types) (iv) camshaft grinders
3. Form Grinders In a form grinder the abrasive wheel, of special shape actuated by an in feed and sometimes by a traverse feed grinds a formed surface on revolving cylindrical blanks, the form .being determined by the shape of the wheel or by relative movement of the wheel head and the work. The following types may be classed as form grinders
(i) Ordinary form grinders (ii) Thread grinders (iii) Gear grinders
4. Surface Grinders A surface grinder is designed for the grinding of flat surfaces. These grinders may be classified as follows.
(i) Surface grinders using the .face of the wheel Horizontal spindle and Vertical spindle)
(ii) Surface grinders using the flank of the wheel (Tool and cutter grinder)
5. Center-less grinders In a center-less grinder the work is traversed across the face of an abrasive wheel. Being supported on a work-rest blade (instead of being held between centers or in a chuck) and rotated between the grinding wheel and a regulating wheel. The common types are:
(I) External center-less grinders (ii) Internal center less grinders
6. Internal grinders The abrasive wheel of an internal grinder, actuated by a traverse feed and an intermittent in feed, grinds internal surfaces of cylindrical, or modified cylindrical, shape on the rotating work. Two types are commonly seen.
(i) Chucking grinders (ii) Planetary- spindle grinders
In all types of grinders, suitable means is provided for the independent selection of cutting speed peripheral speed of the grinding wheel), work speed (peripheral speed of the work), rate of table traverse (sweep of grinding wheel across the face of the work), and rate of wheel in feed (depth of cut).

No comments:

Post a Comment

Dont paste link here..