Archive | Casting

Casting of Metals: Aims, Defects and Design | Industries | Metallurgy

In this article we will discuss about:- 1. Introduction to Casting Process 2. Aims in Making a Casting 3. Types 4. Patterns 5. Design 6. Technical Aspects of Making Sound Castings 7. Inspection 8. Defects. Introduction to Casting Process: Casting process is based on the property of a liquid to take up the shape of vessel containing it. Molten metal [...]

By |2017-07-24T11:54:39+05:30July 24, 2017|Casting|Comments Off on Casting of Metals: Aims, Defects and Design | Industries | Metallurgy

Properties of Moulding Sand | Materials | Casting | Metallurgy

The following points highlight the nine main properties of moulding sand. The properties are: 1. Permeability 2. Cohesiveness 3. Adhesiveness 4. Plasticity 5. Refractoriness 6. Chemical Resistivity 7. Binding Property 8. Flowability 9. Green Strength. Property # 1. Permeability: The passage of gaseous materials, water and steam vapour through the moulding sand is related to porosity or in other words [...]

By |2017-07-24T11:54:39+05:30July 24, 2017|Casting|Comments Off on Properties of Moulding Sand | Materials | Casting | Metallurgy

Determining the Essential Qualities of Sand: 6 Tests | Moulding | Metallurgy

The following points highlight the six main tests done to determine the essential qualities of sand. The tests are: 1. Grain Fineness Test 2. Permeability Test 3. Sand Mould Strength Test 4. Moisture Content Test 5. Clay Content Test 6. Hardness Test. 1. Grain Fineness Test: Granular particles of various sizes and shapes provide variable interstices (space between grains) and [...]

By |2017-07-24T11:54:39+05:30July 24, 2017|Casting|Comments Off on Determining the Essential Qualities of Sand: 6 Tests | Moulding | Metallurgy

Pattern Allowances for Proper Casting of Metals | Industries | Metallurgy

Pattern allowances in order to produce a casting of proper size and shape depend partly on product design, mould design, shrinkage and contraction characteristics of the metal being cast, etc. Actually, it is very difficult to predict precisely any rule mathematically, and a process of trial and error is best to achieve adjustment of pattern dimensions to obtain desired results. [...]

By |2017-07-24T11:54:39+05:30July 24, 2017|Casting|Comments Off on Pattern Allowances for Proper Casting of Metals | Industries | Metallurgy

Moulding Sand: Types and Constituents | Casting | Metallurgy

In this article we will discuss about:- 1. Definition of Moulding Sand 2. Types of Moulding Sand 3. Chief Constituents. Definition of Moulding Sand: The principal raw material used in moulding is the moulding sand because it provides several major characteristics that may not be obtained from other materials. Moulding sand is defined as granular particles resulting from the breakdown [...]

By |2017-07-24T11:54:39+05:30July 24, 2017|Casting|Comments Off on Moulding Sand: Types and Constituents | Casting | Metallurgy

Tools and Equipment for Moulding of Metals | Industries | Metallurgy

Small or medium-sized castings are made in flask— a box shaped container without top and bottom, which confines the sand moulds  (Refer Fig. 3.28).  It is made in two parts, held in alignment by dowel pins. The top part is called the cope and the lower part is called the drag. If the flask is made in three parts, the [...]

By |2017-07-24T11:54:39+05:30July 24, 2017|Casting|Comments Off on Tools and Equipment for Moulding of Metals | Industries | Metallurgy

Patterns Used for Casting of Metals | Industries | Metallurgy

The following points highlight the fifteen main patterns used for casting of materials in an industry. The patterns are: 1. Single-Piece or Solid Pattern 2. Split Patterns 3. Loose Piece Pattern 4. Gated Pattern 5. Match Plate Pattern 6. Follow Board Patterns 7. Sweep Patterns 8. Segmental Pattern or Part Pattern 9. Skeleton Pattern 10. Shell Pattern 11. Built-Up Pattern [...]

By |2017-07-24T11:54:39+05:30July 24, 2017|Casting|Comments Off on Patterns Used for Casting of Metals | Industries | Metallurgy

Permanent Mould Casting: Characteristics and Limitations | Metallurgy

In this article we will discuss about:- 1. Meaning of Permanent Mould Casting or Gravity Die Casting 2. Characteristics of Permanent Mould Casting 3. Limitations. Meaning of Permanent Mould Casting or Gravity Die Casting: Like sand casting, this method also consists of pouring molten metal but in a metallic mould without external pressure. Moulds are generally made of cast iron [...]

By |2017-07-24T11:54:38+05:30July 24, 2017|Casting|Comments Off on Permanent Mould Casting: Characteristics and Limitations | Metallurgy

Die Casting Alloys Used in Industries: 5 Types | Metallurgy

The following points highlight the five main types of die casting alloys used in industries. The types are: 1. Zinc-Alloys 2. Aluminium-Alloys 3. Copper Base Alloys 4. Magnesium Base Alloys 5. Lead and Tin Base Alloys.  Type # 1. Zinc-Alloys: They are most widely used as die casting alloys (as over 75% of die castings produced are zinc base). The [...]

By |2017-07-24T11:54:38+05:30July 24, 2017|Casting|Comments Off on Die Casting Alloys Used in Industries: 5 Types | Metallurgy

Sand Moulds: Definition and Classification | Casting | Metallurgy

In this article we will discuss about:- 1. Definition of Sand Moulds 2. Classification of Sand Moulds 3. Feeding of Metal. Definition of Sand Moulds: A sand moulds may be defined as-a preformed sand container into which molten metal is poured and allowed to solidify. After casting it is removed from the sand mould, sand mould is generally destroyed. The [...]

By |2017-07-24T11:54:38+05:30July 24, 2017|Casting|Comments Off on Sand Moulds: Definition and Classification | Casting | Metallurgy
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