Boring machine & its types by Engr.Umair raza

Boring machine & its types by Engr.Umair raza

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  Manufacturing Processes (Lab)Umair Raza 19013386-002 Studyof Boring|Bs-Mechanical Engineering&Technology 16 Objectives:  Introduction  Evolution Of Drilling Machine :  Parts Of Drilling Machine  Operation Of Drilling Machine  Working Principle Of Drilling Machine  Safety Precautio Wheninternal surface of a hollowpartisturned,a single pointcuttingtool isusedfor enlargingahole ,the operationiscalledboring.The baron whichsingle pointtool ismountediscalledboringbar. Byusingsimple attachmentsboringmachine can be usedfor screw cutting, turning, planetary,grinding,gear cutting BoringHead WorkingPiece Cutter End Support Column Table Saddle Cross Slide Types of Boring Machine:  Horizontal boring Machine  Precision boring Machine  Vertical boring Machine  Table type  Jig boring Machine  Standard Vertical boring Machine  Planer type  Planer type  Turret type boring Machine  Floor type  Vertical Milling Machine Type  Multiple spindle The first boring machine tool was invented by John Wilkinson in 1775. Head Stock
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  Manufacturing Processes (Lab)Umair Raza 19013386-002 Studyof Boring|Bs-Mechanical Engineering&Technology 17 Horizontal boring Machine: In a horizontal boring machine, the work is supporting on a table which is constant and the tool turns into a horizontal axis. A horizontal boring machine can perform boring, reaming, turning, threading, facing, milling, grooving, recessing and many other operations with suitable tools. Workpieces which are heavy, irregular and off-balance can conveniently hold and easy to machining. Parts of horizontal boring machine: 1. Bed 2. Headstock supporting column 3.End supporting column 3. Headstock 5.Saddle and table 4. Boring bars Table Type Horizontal Boring Machine The table types are the most common of all horizontal boring machines. The name horizontal boring machine is given because the work is mounting on the table which is adjustable and feeds is giving by hand or power, lengthwise or crosswise with respect to the bed of the machine. The headstock may adjust vertically on the column and the spindle has a horizontal feed motion. The machine essentially consists of a bed, headstock supporting column, end supporting column, headstock, saddle and table, and boring bar. The table, saddle and headstock may adjust by leadscrews using micrometre dials. This type of machine is suitable for general purpose work where other operations, in addition to boring, is required to be performed. Floor Type Horizontal Boring Machine The floor type horizontal boring machine having notable uses a constant floor-plate on which T- slots is providing to hold the work. The headstock supporting column and the end supporting column is mounting on the runways which are placed at right angles to the spindle axis. Thus any crosswise adjustment or cross-feed movement is providing by the spindle itself and not by the work.
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  Manufacturing Processes (Lab)Umair Raza 19013386-002 Studyof Boring|Bs-Mechanical Engineering&Technology 18 Planer Type Horizontal Boring Machine The planer type horizontal boring machine resembles the table type but the table slides direct on the bed instead of on a saddle angles to the spindle similar to a planer. The end of the supporting column and headstock supporting column may adjust towards or away from the table for accommodating different widths of works. This type of machine is suitable for supporting a long work. Multiple Head Type Horizontal Boring Machine The machine resembles a double housing planer or a Plano-miller. The table is supporting on a long bed on which it reciprocates. There are two vertical columns at two sides of the bed, nearly at the middle of the bed. The two columns are bridged by a cross rail. The machine may have two, three or four headstocks. This type of machine may use as a horizontal and vertical machine. The machining operations can perform simultaneously at different work surfaces. Jig boring Machine Jig boring is used to accurately enlarge existing holes and make their diameters highly accurate. Jig boring is used for holes that need to have diameter and total runout controlled to a high degree. ... Dedicated jig boring machines are designed to machine holes with the tightest tolerances possible with a machine tool. It uses a single point cutting tools to machine surfaces rapidly and accurately.
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  Manufacturing Processes (Lab)Umair Raza 19013386-002 Studyof Boring|Bs-Mechanical Engineering&Technology 19 Cemented carbide and diamond tipped tools are operated at a very high cutting speed to produce accurately sized holes with fine surface. Jig boring machine is a precision boring machine, resembles to vertical milling machine in construction. Accurate positioning of holes is achieved by Lead screw method or Mechanical / Electrical Gauging method or Optical measuring method Planer type (Jig boring Machine) Vertical boring machine Vertical boring machine are a specialized type of industrial machinery used for specific functions or tasks. This product is often large in size and uses a rotating piece attached to a horizontal table. The borer is able to travel upwards or downwards depending on the operator.. Standard vertical boring Standard vertical boring machine is the largest of the machine tools. It is used to machine inside and outside diameters and facing large pieces which are more or less symmetrical such as large ring-gear blanks, steam turbine castings, water turbine runners, locomotive tires, tables for machine tools, flanges for large pipes and pressure vessels. The size of such a machine is given by the diameter of the largest workpiece which can be machined. Vertical turret type boring machine Vertical turret type boring machine is basically a vertical boring mill and has turrent arrangement of holding the tools. It can do essentially the same jobs, but on a smaller scale. The machine looks like a turrent lathe, with its head stock resting on the floor and its axis vertical. The table is usually called a chuck because of its adjusting jaws for work clamping.
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  Manufacturing Processes (Lab)Umair Raza 19013386-002 Studyof Boring|Bs-Mechanical Engineering&Technology 20 Boring Tools: Boring tools are held in boring tool holders which may be either fixed or rotating type. Fixed holders are used in work-rotating machines and rotating holders in tool rotating machines. Size of boring bar should be such as to provide maximum rigidity and also permit sufficient clearance for disposal of chips. Normally boring bar diameter is taken as 0.7 x bore diameter. It should have minimum overhang. Precisionboring Machine: This machine rough bored, inserted a bushing, and finish bored an appliance motor end shield utilizing a drawbar-actuated precision boring tool. Various types of boring tool holders i.Adjustable Boring Bars: These are built with cartridges (to hold throwaway type inserts) adjustable in axial and radial directions by set screws. ii. Damped Boring Bars: In it, dampers are provided at the feed end to absorb vibrations. iii. Boring Head: It is more rigid boring tool holder and is used for roughing and finishing of large bore (100 to 500 mm). Provision to offset cutting axially and radially exists. Two cutters can be mounted radially at 180° to have balanced cutting. iv. Boring and Facing Heads: This enables boring of large bores and facing of seating surfaces at right angles to the bore. Radial tool feeding facility also exists.