Class: Senior Secondary School 2 (SS2 / SSS2)
Term: 3rd Term
Week: 5
Age: 16 years
Duration: 45 minutes
Subject: Metal Work
Curriculum Theme: Pre-Vocational Studies
Previous Lesson: .
Topic: Hand Forging Operations
Subject Matter: Hand forging operations (upsetting, drawing down, setting down, bending, punching, drifting)

Specific Objectives

By the end of the lesson, pupils should be able to:

Cognitive Domain:

Define hand forging.
Identify and describe various hand forging operations.
State the purpose of each forging operation.

Affective Domain:

Appreciate the importance of hand forging in metal fabrication.
Develop an interest in learning practical metalwork skills.
Recognize the need for safety precautions during forging operations.

Psychomotor Domain:

Observe and identify the tools used for hand forging operations.
Visually differentiate between the outcomes of various forging processes.

Collaborate effectively during group discussions or observational activities related to forging.

Reference Materials

The following resources were used in planning this lesson:

Senior Secondary Schools Education Curriculum
State Unified Scheme of Work
Basic Metalwork for Senior Secondary Schools by E.J. Love

Instructional Materials

The teacher will teach this lesson with the aid of:

Forge
Anvil
Forging tongs
Hammers (e.g., ball-peen, cross-peen)
Chisels and punches
Examples of forged items (if available)
Charts or diagrams illustrating various forging operations

Rationale for the Lesson

This lesson helps pupils understand fundamental metalworking processes that transform metal properties and shapes. It provides practical knowledge essential for various trades and industries, enabling pupils to appreciate the skills involved in creating metal objects.

Prerequisite/Previous Knowledge

Pupils have basic knowledge of different types of metals, common workshop tools, and general workshop safety rules.

Lesson Content/Board Summary

Hand Forging Operations

Introduction to Hand Forging

Hand forging is a metalworking process that involves shaping metal using localized compressive forces, often with a hammer or power hammer, at high temperatures. The metal is heated to a plastic state, making it malleable enough to be shaped without fracturing. This process changes the grain structure of the metal, improving its strength and toughness.

Types of Hand Forging Operations

The following are common hand forging operations:

Upsetting

Upsetting is a forging operation used to increase the cross-sectional area of a workpiece while simultaneously decreasing its length. This is achieved by hammering the end of a heated bar against the anvil, causing the metal to bulge outwards.
Drawing Down (or Drawing Out)

Drawing down is a forging operation used to decrease the cross-sectional area of a workpiece while simultaneously increasing its length. This is typically done by hammering the metal on the anvil, often using a cross-peen hammer to spread the material.
Setting Down

Setting down is a forging operation where a distinct shoulder or step is formed on a workpiece. This is usually done by heating a specific section of the metal and hammering it down onto a sharp edge or a specially shaped tool (a set hammer) to create a reduction in section at a precise point.
Bending

Bending in forging involves permanently deforming a workpiece along a curved line or angle. The metal is heated to a plastic state and then bent over an anvil horn, a bending fork, or with the aid of tongs and a hammer to achieve the desired angle or curve.
Punching

Punching is a forging operation used to create a hole through a workpiece. A heated punch is driven through the hot metal using a hammer, typically over a bolster plate with a matching hole to support the workpiece and allow the slug to fall through.
Drifting

Drifting is a forging operation used to enlarge or refine a previously punched hole. After punching, a drift (a tapered tool) is driven into the hole to expand it to the desired size and shape, smoothing the internal surfaces.

Teaching Methods/Instructional Techniques

Discussion, Lecture, Demonstration, Question and Answer, Visual Aids

Instructional Procedures

Step 1: Introduction

Time: 5 minutes
Teaching Skill: Set Induction
Teacher’s Activity: The teacher greets the pupils, reviews the previous lesson on basic workshop safety, and then introduces the topic of hand forging operations by asking pupils if they have ever seen a blacksmith at work.
Pupils’ Activity: Pupils respond to the teacher’s greetings, recall aspects of the previous lesson, and share their experiences or knowledge about blacksmiths.
Learning Point: Pupils connect previous knowledge to the new topic and are motivated for the lesson.

Step 2: Explanation of Hand Forging

Time: 8 minutes
Teaching Skill: Explanation/Lecture
Teacher’s Activity: The teacher defines hand forging, explaining that it involves shaping heated metal using hammers and other tools. The teacher also highlights the importance of temperature and the malleability of metal during this process.
Pupils’ Activity: Pupils listen attentively, take notes, and ask questions for clarification.
Learning Point: Pupils understand the fundamental concept and principles of hand forging.

Step 3: Upsetting and Drawing Down

Time: 7 minutes
Teaching Skill: Demonstration/Explanation
Teacher’s Activity: The teacher explains and illustrates upsetting as the process of shortening and thickening metal, and drawing down as the process of lengthening and thinning metal. The teacher may use diagrams or simple analogies to demonstrate these actions.
Pupils’ Activity: Pupils observe the illustrations, listen to the explanations, and try to visualize the processes.
Learning Point: Pupils learn the definitions and practical applications of upsetting and drawing down.

Step 4: Setting Down and Bending

Time: 7 minutes
Teaching Skill: Explanation/Visualisation
Teacher’s Activity: The teacher explains setting down as creating a shoulder or step, and bending as permanently curving the metal. Diagrams showing how these operations are performed on an anvil are used.
Pupils’ Activity: Pupils pay attention to the descriptions and diagrams, relating them to practical scenarios.
Learning Point: Pupils understand how to create shoulders and curves in metal through forging.

Step 5: Punching and Drifting

Time: 7 minutes
Teaching Skill: Explanation/Illustration
Teacher’s Activity: The teacher describes punching as making a hole in hot metal and drifting as enlarging or shaping that hole. The teacher shows pictures of punches and drifts and explains their use.
Pupils’ Activity: Pupils listen, observe the tools, and understand the sequence of operations for making and shaping holes.
Learning Point: Pupils grasp the techniques for creating and modifying holes in forged metal.

Step 6: Safety Precautions in Forging

Time: 3 minutes
Teaching Skill: Emphasizing/Instruction
Teacher’s Activity: The teacher briefly discusses essential safety precautions when working with hot metal and heavy tools, such as wearing appropriate Personal Protective Equipment (PPE) and maintaining a clean workspace.
Pupils’ Activity: Pupils listen and note the importance of safety.
Learning Point: Pupils are reminded of the critical need for safety during forging operations.

Step 7: Evaluation/Review

Time: 5 minutes
Teaching Skill: Questioning/Assessment
Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

What is hand forging?
State two purposes of hand forging.
Explain the difference between upsetting and drawing down.
Describe the forging operation known as bending.
How does punching differ from drifting in forging?

Pupils’ Activity: Pupils answer orally and in writing.
Learning Point: Pupils demonstrate understanding of the lesson.

Step 8: Conclusion

Time: 3 minutes
Teaching Skill: Summarizing/Assignment
Teacher’s Activity: The teacher summarizes the key hand forging operations discussed and encourages pupils to observe metalworking processes around them. The teacher assigns homework for pupils to research other forging operations not covered in the lesson.
Pupils’ Activity: Pupils listen to the summary, copy the homework, and prepare for the next lesson.
Learning Point: Pupils consolidate their learning and are encouraged to explore further.

Lesson Keywords

Hand forging – Shaping metal by hammering at high temperatures.
Upsetting – Increasing cross-section, decreasing length.
Drawing down – Decreasing cross-section, increasing length.
Setting down – Creating a distinct shoulder or step.
Bending – Permanently deforming metal along a curve.
Punching – Creating a hole in metal.
Drifting – Enlarging or refining a punched hole.

Differentiation

For pupils who grasp concepts quickly, the teacher can challenge them to identify specific tools used for each operation or discuss the metallurgical effects of forging. For pupils who need more support, the teacher can provide simplified diagrams and allow for peer explanation.

Note for teachers using this lesson plan

Emphasize safety at all times. If a practical demonstration or a visit to a local blacksmith workshop is feasible, it will significantly enhance pupil understanding and engagement. Use visual aids extensively to illustrate complex processes. Encourage pupils to connect these operations to everyday metal objects.