Broaching Machine 

What are the Advantages and Limitations of Broaching Machine?

Advantages of Broaching Machine Broaching has been adopted for mass production work. It has following features and advantages: Rate of production is very high with properly applied broaches, fixtures and machines, more pieces can be turned out per hour by broaching than by any other means. Little skill is required to perform a broaching operation, in most cases the operator merely loads and unloads the work piece. High accuracy and high class of surface finish is possible. A tolerance of ±0.0075 mm and surface finish of about 0.8 microns can…

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Broaching Machine 

What are the Broach Elements?

Ordinary cut broaches for machining previously drilled holes consist of the following elements: Pull End – This is designed to permit engagement of the broach with the broaching machine through the use of puller head. Front Pilot – This centres the broach in the hole before the teeth begin to cut. Roughing and Semi Finishing Teeth – These remove most of the stock in the hole. Finishing Teeth – These are for sizing the hole and must have the shape required for the finished hole. Rear Pilot and Follower Rest…

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How Many Types of Broaching Machine are there?

There are four types of broaching machine: Horizontal broaching machine Vertical Broaching machine Surface broaching machine Continuous broaching machine Horizontal Broaching Machine All horizontal machines are of pull type. These may be used for either internal or external broaching. The horizontal broaching machine consists of a bed more than twice the length of broaching stroke. The broach pilot gives drive for pulling the broach. Horizontal broaching machines are primarily used for broaching key ways, splines, slots, round holes and other internal shapes or contours. These machines have the disadvantage of…

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What are the Main Parts of a Broaching Machine?

Ram – It is actuated by the piston in the cylinder of the hydraulic drive. It moves to and fro during the operation. In case of pulling type of broaching machine the ram pulls the broach with the required pressure for cutting stroke and goes inside the ram head.   Hydraulic Drive – It is housed in the base and powered by electric motor. This provides the required pressure for pulling or pushing the broach. Bed – Bed is the robust casting on which the main units are mounted. The…

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What is a Broaching Machine?

The term broaching may have been derived from an ancient roman word braccus, which meant an object having projecting teeth. The operation started in the year 1850 when broaching tools were called “drifts”. These drifts were being hammered in blacksmith shop through the work or pushed through with an arbor press. Broaching is a method of removing metal by pushing or pulling a cutting tool called a broach. The tool may be pulled or pushed through the surface to be finished. Surface is finished by broaching flat or contoured and…

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How Testing of Rubber Compound is Carried Out?

This can be sub-divided into two distinct categories: Testing of unvulcanized compound. Testing of vulcanized compound. Testing of Unvulcanized Compound Testing of Unvulcanized Compound Test Measuring Instrument Significance Viscosity Moony viscometer It gives idea about processing performance of the rubber compound in moulding. Scorch time Moony viscometer Optimum cure time can be obtained. Testing of Vulcanized Rubber Compound No tests should be performed until at least 16 hours after vulcanizing as significant post vulcanization changes in structure of the material may occur during this period. Tensile Test – These tests…

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What is Cryogenic Tumbler?

After the rubber parts are removed from the moulds, they contain thin flash, a result of the elastomer flowing in multisection mould. This flash is typically removed by exposing the parts to a cryogenic tumbling process. This process is carried out in a machine known as cryogenic tumbler. In this machine liquid Nitogen is used to bring the temperature down upto -1960 C. Rubber components are put in the machine and the machine is then switched on. Due to the cooling effect, these components become brittle. The flash being the…

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What is Vulcanization of Rubber?

The process transforms elastomers with weak thermoplastic properties into a strong, elastic and tough substance with useful properties and introduces a network of cross links into the elastomers. Tensile strength is maximum at optimum cure. Beyond this point, the stock is said to be over cured. It gets stiffer and harder but weaker and less extensible. Techniques of Vulcanization Vulcanisation can be carried out using several techniques. Compression Moulding – This is the most common method used in the industry. Here the blank is placed in a two piece mould, one…

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What are the various types of resistant rubbers?

Weather Resistant Rubber Ethylene Propylene Rubber – These are the fastest growing elastomers because of its outstanding properties such as good weather resistant in ozone environment. It is used in tyre side walls, tank linings, wire and cables, mechanical goods, agricultural equipment and automotive applications. Modified Polyethylene or Chlorosulphonated Polyethylene – It is unique among elastomers as it is derived from a plastic. It is prepared by dissolving polyethylene in a suitable solvent and passing simultaneously Sulphur dioxide and Chlorine in the presence of a free radical catalyst to bring…

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What are the General Purpose Rubbers available?

There are four types of rubbers under general purpose rubbers. They are: Styrene-Butadiene Rubber – Styrene-Butadiene Rubber (SBR) constitutes more than half of the world production of synthetic rubber and exceeds natural rubber supply. In fact, tyre industry depends more on SBR than a natural rubber because it is available in plenty and serves the purpose better after the incorporation of fillers. Butyl Rubber – Butyl rubber is produced by copolymerising small amount of isoprene (1-3%) with isobutylene catalysed by aluminium chloride (AlCl3) dissolved in methyl chloride. The extremely rapid…

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