Pattern practices - manufacturing processes, Mechanical Engineering

Pattern Practices - Manufacturing processes:

Pattern Practices : A pattern may be defined as a replica or fascimile model of the desired casting which, when packed or embedded in a suitable moulding material, produces a cavity called mould.

1.Types of patterns : These  depends upon many factors like the bulk of casting, type of moulding processes, number of castings required and the anticipated difficulty of moulding, on account of the typical shape or design of casting.

            The following types of patterns are commonly used :

            1.   Solid or single piece pattern                2.   Two-piece or split pattern

            3.   Multi-piece pattern                                 4.   Match plate pattern

            5.   Gated pattern                                          6.   Skeleton pattern

            7.   Sweep pattern                                        8.   Pattern with loose piece

            9.   Cope and drag pattern                          10. Follow board pattern

            11. Segmental pattern

 2.Allowances for pattern : A pattern is always made larger than the required size of the casting in order to allow for various factor, such as shrinkage, machining, distortion and rapping etc. The following allowances are provide in a pattern :

            1.   Shrinkage allowance                            2.   Machining allowance

            3.   Draft allowance                                      4.   Rapping or shake allowance

            5.   Distortion allowance

            6.   Mould wall movement allowance

Posted Date: 2/8/2013 5:02:14 AM | Location : United States

Related Discussions:- Pattern practices - manufacturing processes, Assignment Help, Ask Question on Pattern practices - manufacturing processes, Get Answer, Expert's Help, Pattern practices - manufacturing processes Discussions

Write discussion on Pattern practices - manufacturing processes
Your posts are moderated
Related Questions
Expression for the maximum shearing stress: Obtain expression for the maximum shearing stress and maximum shearing planes. Sol.: The condition for maximum shearing stress i

Question: As shown in the figure, the jet transport B is flying north with a velocity V B = 600 Km/h when a smaller aircraft A passes underneath the transport headed in the 60

chemical milling is used in aircraft plant to create pockets in wing sections made of an aluminium alloy. the starting thickness of one work part is 20 mm.a series of rectangular s

Write an essay on air, water and soil-based heat pumps. Discuss the advantages and the disadvantages of each system. For each system identify the conditions under which that system

Rutile Electrode This type has thicker coating than cellulosic coated and the flux is mainly composed of rutile (titanium di - oxide) and silicates, with a negligible amount of c

Corollaries of first law of thermodynamics: First law of thermodynamics has significant corollaries. Cor ollary 1: (First Law for process). There exists property of

Application of Hydrostatic sensor paver machine The Hydrostatic sensor paver machine that is used for lying bituminous Mixed material, roll-down or lean-mixed concrete, track-

Q. Requirements for vessels with thickness? The following additional requirements are applicable, as specified,  to Carbon Steel and Low Alloy steel pressure vessels with main

Find out change in diameter: A cylindrical shell, 0.8 m in a diameter and 3 m long is along with 10 mm wall thickness. If the shell is subjected into an internal pressure of 2