Parameters are missing. Advance Manufacturing Processes

You may be Loooking for

Notifications
Mark All As Read

You have to be logged in for this features
Just now

View All
Guest

Please log in

Login

IOE-BOOSTER

IOE

Questions
Todays Tutorials
Previous Tutorials
Asked Questions
Learning By playing
GAMES
Exams From
Todays Pick Studied question yet
Exam Results
Results
My Plans
My Plans

Ask Question

Ask Mcqs

Guest
You need to login to ask any Questions from chapter of

Chapter:

46. For machining of high melting point materials, _____ wires are used.

gallium zinc coated aluminium coated silver

zinc coated

Zinc coated wire is used in machining high melting point workpiece materials. The zinc coating vaporises in lower temperature than brass core. Vaporisation reduces amount of heat that transmits to brass and core wears less.

Hint Answer

47. _____ is/are used as di-electric fluid in die sink EDM process.

Pure water Silicone gel Petroleum products Epoxy resins

Petroleum products

The dielectric fluid in die-sink EDM process is usually some petroleum product. In wire cut EDM process, it is most common to use de-ionised water.

Hint Answer

48. Which of following is not application of wire cut EDM process?

Machining ejector holes Cutting the ejector pins Machining cores of various moulds Machining of complex shapes made of plastic

Machining of complex shapes made of plastic

The most typical wire cut EDM applications in mould making are: ?
? Machining ejector holes
? Shaping and cutting ejector pin ends to follow mould cavity surface shapes
? Machining cores and corresponding fastening holes in mould plates and inserts.

Hint Answer

49. During mould making by wire cut EDM, it is important to harden __ to counter effects of changes in shape of workpiece due to heat treatment.

the insert electrode wire electrode holding coils bolting points in the workpiece

the insert

It is important to harden insert or mould plate steel before making tightly tolerated ends in ejector pin holes because heat treatment tends to change workpiece shapes at a certain degree.

Hint Answer

50. Which of following machining process is usually preferred for cutting of ejectors which are used in mould making?

Milling Hobbing Wire-cut EDM Die sink EDM

Wire-cut EDM

There is a need to cut ejector to a right dimension and if cavity surface is shaped re is also a need to shape ejector end. The wire ED machine is one of most accurate machines in mould shops and usually re is also free machining time available. Anor option is to cut and shape ejectors in a milling machine, but most accurate milling machines are used in mould cavity machining operations and normally y are rar busy for long periods of time.

Hint Answer

51. How many ways are re for making fixed cores by wire cut EDM process?

2 3 4 5

2

Basically re are two options for making fixed cores:
? Machine cores directly to mould insert plate or mould plate
? Machine cores to separate pieces of mould steel and attach piece to mould assembly.

Hint Answer

52. The selection of manufacturing process depends upon ________

chemical reactivity between the mould material and the di-electric fluid mould shape application of the mould number of parts to be machined

mould shape

The selection depends on core dimensions and shapes. High and narrow cores or cores with sharp shapes are easiest to manufacture with separate parts. Special cases are core pins. Core pins are used in making small diameter holes to castings.

Hint Answer

53. The wire EDM process is used for making moulds with high drafted walls.

True False

True

Like every wall in mould opening direction, core walls are also drafted. It is rar difficult to make high drafted walls with a milling machine. Especially in case of injection moulding or high pressure die casting moulds where accuracy requirements are very high. The wire ED machine produces se shapes accurately with ease.

Hint Answer

54. For manufacturing of complex shapes, soft electrode wires are used.

True False

True

Soft wires are useful in applications with complex shapes, where machine changes wire tilting angle several times. The harder grades are used in automatic re-threading mechanisms.

Hint Answer

55. Which of following does not hold true about wire cut EDM?

The electrode wire touches the workpiece while cutting the workpiece material It can machine any electrically conductive material irrespective of its hardness The di-electric fluid gets ionized in between the tool-electrode gap During machining, the electrode wire does not get heated

The electrode wire touches the workpiece while cutting the workpiece material

The wire does not touch workpiece, so re is no physical pressure imparted on workpiece compared to grinding wheels and milling cutters.

Hint Answer

Previous

Nexttt

All Chapters

View all Chapter and number of question available From each chapter from

Gear & Metal Cutting Processes

Gear & Metal Cutting Processes

Roll Forming & Electromagnetic Forming

Roll Forming & Electromagnetic Forming

Electro-Chemical Grinding Machining

Electro-Chemical Grinding Machining

Electrochemical Etching

Electrochemical Etching

Micromachining, Abrasive Jet Micromachining

Micromachining & Abrasive Jet Micromachining

Ultrasonic Machining -Friction Welding

Ultrasonic Machining & Friction Welding

Advance Manufacturing Processes

Advance Manufacturing Processes

Heat Treatment Processes

Heat Treatment Processes

Topics

This Chapter consists of the following topics

Advance Manufacturing Processes

For machining of high melting point materials, _____ wires are used.

_____ is/are used as di-electric fluid in die sink EDM process.

Which of following is not application of wire cut EDM process?

During mould making by wire cut EDM, it is important to harden __ to counter effects of changes in shape of workpiece due to heat treatment.

Which of following machining process is usually preferred for cutting of ejectors which are used in mould making?

How many ways are re for making fixed cores by wire cut EDM process?

The selection of manufacturing process depends upon ________

The wire EDM process is used for making moulds with high drafted walls.

For manufacturing of complex shapes, soft electrode wires are used.

Which of following does not hold true about wire cut EDM?

Info Message