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Velocity Of Metal Flow In A Sprue - Metal Casting - Answers
Manufacturing Processes Chapter 10 Flashcards | Quizlet

1.) Sprue - a tapered vertical channel through which the molten metal flows downward in the mold. 2.) Runners - are the channels that carry the molten metal from the sprue into the mold cavity or connect the sprue to the gate. 3.) Gate - the portion of the runner through which the molten metal …

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TYPES OF GATING SYSTEM IN CASTING PROCESS – Bajrang ...

Aug 23, 2018· The size of the sprue fixes the flow rate. The amount of molten metal that can be fed into the mold cavity in a given time period is limited by the size of the sprue. The sprue should be located at certain distance from the gates so as to minimize velocity of molten metal at ingates. Sprue should be tapered by approximately 5% minimum to

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Metal Casting -1

Sprue height, h t= 20 cm Cross-section of sprue base, A 3= 2.5 cm2 Volume of mold cavity, V= 1560 cm3 Find: a) Flow velocity at sprue base b) Flow rate of metal into mold cavity c) Mold filling time ME 206: Manufacturing Processes & Engineering Instructor: Ramesh Singh; Notes by: Prof. S.N. Melkote / …

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Solved: Molten Metal Is Poured Into A Sprue At A Constant ...

Molten metal is poured into a sprue at a constant flow rate during the time it takes to fill a mold. At the end of pouring, the sprue is filled, and there is negligible metal in a pouring cup. The sprue is 6.0 inches long, its cross-sectional area at the top is 0.8 in^2, and at the base, 0.6 in^2.

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Questions - Answers: Velocity of Metal flow in a Sprue ...

Jun 06, 2014· The figure shows a tapered sprue with the metal head H 1 in the pouring basin, and the total metal head, H 2. The cross-sectional areas at the top and the bottom of the sprue are A 1 and A 2. Determine the metal flow velocity at the top and bottom of the sprue. Also derive a relation between heads H 1, H 2 and cross-sectional areas A 1, A 2 of ...

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GATE Questions & Answers of Casting, Forming and Joining ...

A sprue in a sand mould has top diameter of 20 mm and height of 200 mm. The velocity of the molten metal at the entry of the sprue is 0.5 m/s. Assume acceleration due to gravity as 9.8 m/s 2 and neglect all losses. If the mould is well ventilated, the velocity (upto 3 decimal points accuracy) of the molten metal at the bottom of the sprue is ...

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Ch 7 Fundamentals of Metal Casting Flashcards | Quizlet

A riser in casting is described by which of the following (three correct answers): (a) an insert in the casting that inhibits buoyancy of the core, (b) gating system in which the sprue feeds directly into the cavity, (c) metal that is not part of the casting, (d) source of molten metal to feed the casting and compensate for shrinkage during solidification, and (e) waste metal that is usually ...

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How to calculate velocity of metal in casting? | Yahoo Answers

Dec 02, 2012· Pure aluminum is poured into a sand mold. The metal level in the pouring basin is 250 mm above the metal level in the mold, and the runner is circular with a 10-mm diameter. What are the velocity and rate of the flow of the metal into the mold? Is the flow turbulent or laminar?

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Design of Gating System | Casting | Manufacturing Science

Oct 29, 2018· The velocity of a liquid metal in the sprue and the gate is uniform across the cross-section. In fact, the velocity of a fluid in contact with any solid surface is zero and is maximum at the axis of the conduit. The velocity distribution within the conduit depends on the shape of the conduit and the nature of the flow (i.e., turbulent or laminar).

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Magnetic Induction Casting - New Low Pressure Casting Process

Expansion of the cavity, especially after the sprue bush, consequently results in a considerable increase in flow velocity in the riser. This increase leads to turbulence in the molten metal. In order to nevertheless achieve particularly low-turbulence mold filling, the molten metal …

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The flow rate of liquid metal into the downsprue of a mold ...

The flow rate of liquid metal into the downsprue of a mold = 1 liter/sec. the cross-sectional area at the top of the sprue = 800 mm-square and its length = 275 mm. what area should be used at the base of the sprue to avoid aspiration of the molten metal

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Fundamentals of Metal Casting - Islamic University of Gaza

The volume flow rate of metal into a mold is 0.02 m3/s. The top of the sprue has a diameter of 20 mm, and its length is 200 mm. What diameter should be specified at the bottom of the sprue to prevent aspiration? What is the resultant velocity and Reynolds number at the bottom of the sprue if the metal

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Chapter 10 - Fundamentals of Metal Casting Flashcards ...

An increase in sprue height would increase the velocity of the metal that enters the spiral, thus allowing the metal to flow further into the spiral than for a lower sprue height. iii. Tests can be, and are, conducted with the test setup used at elevated temperatures, showing the effect of a preheated mold on the fluidity of the molten metal.

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Chapters 11 & 12 Fundamentals of Casting & Expendable ...

Allows the metal to smoothly flow into the sprue ... Reduces the velocity and changes the direction of the flow of the metal ... Control the flow of the metal into the casting cavity All of the gates in one cavity should operate at the same time Thing of the Gating System as plumbing.

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Metal Casting - SMART GATE INSTITUTE

30. A 200 mm long down sprue has an area of cross-section of 650 mm 2 where the pouring basin meets the down sprue (i.e at the beginning of the down sprue). A constant head of molten metal is maintained by the pouring basin. The molten metal flow rate is 6.5*10 5 mm 3 /s. Considering the end of down sprue to be open to atmosphere and an acceleration due to gravity of 10 4 mm/s 2, the area of ...

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Questions - Answers: About the Lathe - Introduction of ...

Jun 03, 2014· Velocity of Metal flow in a Sprue - Metal Casting; About the Lathe - Introduction of Centre Lathe May (4) March (2) 2013 (105) December (1) October (1) September (1) August (9) July (2) May (2) April (3) March (86)

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Sand Casting Process: Definition, Terminology, Explanation ...

The size and shape of the pouring basin will not have much effect on the flow rate or pouring time of molten metal in the gating system. 3. Sprue: It is connecting the passage between the pouring basin and Runner. It is always vertical with a straight tapered circular cross-section. Characteristics of Sprue: Basically, Velocity of molten metal ...

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(PDF) Measurement of Metal Velocity in Sand Casting during ...

in the Straight Sprue Casting (SSC) and the Coni cal Helix Sprue Casting (CHSC). The average i nlet velocities of the metal in SSC and CHSC w ere 1.34 and 0.49 m/s , respectively in simulation.

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Casting Process | Foundry interview Question and Answers

14. Give the uses of lifter, sprue pin and strike off bar. 1) Lifter is used to remove the loose sand from the mould and to repair the broken surfaces of the mould. 2) Sprue pin is used for making holes for runner and riser in the mould. ... Interview Question and Answers Part 4 Metal Casting Process | Interview Question and Answers Casting ...

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Liquid metal flow in a pouring basin: International ...

Nov 29, 2016· Flow behaviour in pouring basins is investigated through numerical simulation using the general purpose CFD code FLOW-3D. These studies agree closely, and augment earlier identified studies using the code FLUENT. Studies of three different types of pouring basins have shown that the performance of a basin with a weir step and with a smoothly round sprue entrance confirms that the …

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Casting objective questions (mcq) and answers ...

3. In slush casting process..... A. Molten metal is fed into the cavity in metallic mould by gravity B. Metal is poured into die cavity,and after a predeterminded time the mould is inverted to permit a part of metal still in molten state to flow out of cavity C. Cavity is filled with a precalculated quantity of metal and a core or plunger is inserted to force the metal into cavity

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Previous Years Gate Questions on Casting 2001-2006 ...

Jul 24, 2015· Question 4. The primary of a sprue in a casting mould is to (A) Feed the casting at a rate consistent with the rate of solidification (B) Act as a reservoir for molten metal (C) Feed molten metal from the pouring basin to the gate (D) Help feed the casting …

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On the Analysis of Molten Metal Flow through Sprue in ...

Fig. 9 velocity vectors near sprue entrance at Inlet velocity, V=2 m/s m/s B. Analysis of molten metal flow through Tapered sprue Fig.10 Meshed geometry of tapered sprue in GAMBIT 1) Sprue dimensions for tapered sprue Length of sprue=20cm Top height of sprue=10cm Sprue diameter at top=3cm Sprue diameter at bottom=2.5cm 2) Grid Size information

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GATE ME 1999 | Casting Question 61 | Production ...

The maximum velocity must ensure laminar flow into the mould cavity and in the gates of circular cross-section. Design the sprue to avoid aspiration effects. Assume

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What is a Gating System and in What ... - Pacific Die Casting

Die casters recommend ingate be designed to minimize the metal velocity; the design has to facilitate easy fettling, should not lead to hot spot, and the molten metal flow from the ingate has to be proportional to the casting area’s volume. The position of ingate(s) is …

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Metal casting lectures notes | Casting (Metalworking ...

1. If sprue area at its entrance is 5cm2, compute metal velocity at sprue entrance. 2. Calculate velocity & flow rate of metal when metal is in the EMU - Manufacturing Technology midway of sprue Why Sprue X-section is kept taper ?? In order to keep volume flow rate (Q=VA) constant.

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Velocity Measurement and Verification with Modeling of ...

The research concluded that a vertical vortex sprue system had the highest velocity reduction, reducing it by 37% (friction coefficient of 0.63), but had some initial air bubbles travel through the gate before steady-state flow occurred.

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Manufacturing Engineering Questions & Answers - Sanfoundry

Volume flow of liquid form every ingate is different: 4: They are smaller in volume for a given flow rate of metal. Therefore, the casting yield is higher. They are larger in volume because they involve large runners and gates as compared to pressurized system and thus the cast yield is reduced. 5: Velocity is high, severe turbulence may occur ...

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Previous Years Gate Questions on Casting 2007-2013 ...

Jul 24, 2015· Solved Gate Questions on Casting Question 1. A 200 mm long down sprue has an area of cross—section of 650 where the pouring basin meets the down sprue (i.e. at the beginning of the down sprue). A constant head of molten metal is maintained by the pouring basin. The molten metal flow rate is …

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Liquid metal flow in moulds with off-set sprue ...

(1998). Liquid metal flow in moulds with off-set sprue. International Journal of Cast Metals Research: Vol. 11, No. 1, pp. 1-12.

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The Sprue System Design - Ganoksin Jewelry Making Community

The metallurgist figure that the difference in volume between the liquid and solid state of most silver and gold alloys is 5 to 6%. That means that as the metal solidifies, it is losing volume and, if the feed sprue is still liquid, then more metal can now flow in to fill the space that the shrinkage is producing.

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casting defects Flashcards | Quizlet

1. occur when two portions of metal flow together but there is a lack of fusion due to premature freezing 2. pouring temp too low, insufficeint fluidity, pouring rate too slow, cross section is too thick 3. eliminate need for a core, avoid thick sections, increase velocity or increase cross section of runner, increase pouring temp, use die casting

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Metal casting processes

Metal casting processes ... it controls the flow of metal into the mould. Runner: The channel through which the molten metal is carried from the sprue to the gate. Gate: A channel through which the molten metal enters the mould cavity. Chaplets: Chaplets are used to support the cores inside the

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Effects of runner system design on the mechanical strength ...

The oxide films and casting defects existing on the fracture surface of the casting specimens were observed by ... higher metal flow velocity and surface turbulence so that ... tapered sprue, a ...

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GATING SYSTEM PPT - SlideShare

Nov 13, 2017· The amount of molten metal that can be fed into the mold cavity in a given time period is limited by the size of the sprue. • The sprue should be located at certain distance from the gates so as to minimize velocity of molten metal at ingates. • Sprue should be tapered by approximately 5% minimum to avoid aspiration of the air and free fall ...

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Introduction to Metal Casting | Casting terms | Advantages ...

Advantages Of casting. The metal casting process is extensively used in manufacturing because of its many advantages. Molten material can flow into very small sections so that intricate shapes can be made by this process. As a result, many other operations, such as machining, forging, and welding, can be minimized or eliminated.

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