Mp-1 Boaring machine Prepared by: Chauhan vijay Roll no. (13me512) ME-Q(G3)

INTRODUCTION  Boring machine is one of the most important and versatile machines.  It is used to bore holes in large and heavy parts such as engine frame, engine cylinders, cylinder block, machines housings etc.  It is practically impossible to hold and rotate such heavy components in an engine lathes or drilling machine.

4.BORING MACHINE

Types of Boring machine The boring machines may be classified as under: 1.Horizontal boring machine (i) Table type (ii) Floor type (iii) Planer type (iv) Multiple head type 2. Vertical boring machine 3. Precision boring machine 4. Jig boring machine

Types of Boring machine 1.Horizontal boring machine (HBM)  The work is supported by a table which is stationary and the tool revolves on a horizontal axis.  It can perform different operations like boring, reaming, turning, threading, facing, milling, grooving, recessing and many other.  Work piece which are heavy, irregular, unsymmetrical or bulky can also be conveniently held and machined. (i)Table type HBM  It is most common type of all HBMs.  Work is mounted on the adjustable table.  Longitudinal or transverse feed is given manually or by power.  This type of machine is suitable for general purpose work where other operations in addition to boring are required to be performed.

Types of Boring machine (ii) Floor type HBM  It does not have a table for supporting work piece.  It uses a stationary floor-plate on which T-slots are provided to hold the work.  The headstock supporting column and the end supporting column are mounted on the runways which are placed at right angles to spindle axis.  The purpose of such design is to hold very large and heavy work piece which are difficult to be mounted and adjusted on a table.

Types of Boring machine (iii) Planner type HBM  In planner type HBM the table slides directly on the bed instead of on a saddle.  Work piece of different sizes can be accommodated by adjusting the end supporting column and head stock supporting column towards or away from the table.  It is suitable for supporting a long work.

Types of Boring machine (iv) Multiple head type HBM  The table of this machine is supported on a long bed on which it reciprocates.  Two vertical column are located at two sides.  The number of head stocks may be two, three or four.  Machining operation can be performed simultaneously at different work surfaces, to speedup the work.

Types of Boring machine 2. Vertical boring machine (VBM)  In this type of machine work rotates on a horizontal table about a vertical axis and the tool is stationary.  As the table being horizontal, the diameter of the table may be designed as large as possible to support large work pieces.  Multiple tooling may be adapted in the case of a vertical boring machine.  A vertical boring machine is particularly employed for large, heavy, large gear blanks, heavy castings fore steam and water turbine, locomotive and rolling stock tires, flywheels, heavy flanges and number of circular parts.

Types of Boring machine

Vertical boring machine operations The machining operations those can be performed on a vertical boring machine are given below.

Vertical boring machine operations The machining operations those can be performed on a vertical boring machine are given below.

Types of Boring machine 3. Precision boring machine  It uses single point tools to machine surface rapidly and accurately.  Cemented carbide and diamond tipped single point tools are operated at a very high cutting speed to produce accurately sized holes with a fine surface finish.  The machine may be horizontal or vertical.

Types of Boring machine 4. Jig boring machine  First developed in 1910 in Switzerland.  Used as a locating machine.  It is accurate machine tool.  They are popularly used for manufacturing of jigs, fixtures, tools and other precision parts which require high degree of accuracy.  The machine accuracy is very high.  This is due to high rigidity, low thermal expansion.  The spindle and other parts of the machine are extremely rigid to resist deflection and the vibration is lowest.  The spindle runs on antifriction bearing.  Two types of JBM are available(i) Vertical milling machine type (ii) Planer type  It is mainly designed to manufacture precision dies, gauges and jigs and fixtures.  They can also be used as a measuring machine.