--- title: "Basic forging operations" subject: "Workshop Technology" chapter: 9 key: "semester_2/workshop_technology:forging-operations-explained" source: https://www.bctengineer.com/q/semester_2/workshop_technology/forging-operations-explained site: BCT Engineering --- # Basic forging operations Workshop Technology · Chapter 9: Forging Practice - Asked in: year not given, 6 marks - Video: [Smithy and Forging Tools Explained | Forging Operations and Types of Forging | Mootechie](https://www.youtube.com/watch?v=A3ovs0DZ1kQ) — mootechie - Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14 - Page: https://www.bctengineer.com/q/semester_2/workshop_technology/forging-operations-explained - Whole chapter: https://www.bctengineer.com/md/semester_2/workshop_technology/chapter-9 ## Question Define forging. Explain the following forging operations: upsetting, drawing down, fullering, bending, punching and cutting (hot cutting). List the common forging tools. ## Short answer Forging shapes hot metal by hammering or pressing, improving grain flow and strength. Operations: upsetting reduces length and increases cross‑section; drawing down reduces cross‑section and lengthens; fullering cuts grooves to spread metal; bending over the horn; punching drives a hole; hot cutting uses a hot set. Common tools include anvil, hammers, tongs, flatters, swages, fullers, punches and hot sets. ## Answer Forging is shaping metal by hammering or pressing it, generally hot (at red or white heat), so that plastic flow produces the required shape. It improves the grain flow and strength. #### Operations - Upsetting: the length of a bar is reduced and its cross-section increased by compressing it along its axis, e.g. making a bolt head or a rivet head. If the unsupported length exceeds about 3 times the diameter, the bar bends (buckles). - Drawing down: the cross-section is reduced and the length increased by hammering between flat or round faces; the metal is turned after each blow. - Fullering: grooves are made across the bar with a fuller to spread the metal lengthwise (before drawing down) and to form shoulders. - Bending: the hot bar is bent over the anvil horn or in a bending fork to make hooks, angles and rings. - Punching: a punch drives a hole through the hot metal; the job is placed over the pritchel hole of the anvil (or a bolster) so the slug can be pushed out. Drifting enlarges the hole. - Cutting: a hot set or hot chisel cuts the hot bar; a cold set is used for cold work. Other operations: forge welding, swaging, flattening. #### Common forging tools - Anvil (with horn, face, hardie and pritchel holes), hammers (hand, sledge, ball peen), tongs with various jaws, flatters, set hammer, swages, fullers, drifts, punches, hot sets and chisels, and a forge or furnace. ```text upsetting drawing down | | ___________ _| |_ /__________/ length increased |___| head ``` ## Check yourself The answer's key points as multiple-choice questions, with the correct option and why. 1. What does upsetting do to a bar? A. Increases length and reduces cross-section B. Reduces length and increases cross-section C. Makes a hole through it D. Bends it over the anvil horn Answer: B. Compressing along the axis shortens the bar and increases its cross-section, as in forming a bolt head. (Key point: Upsetting) 2. Why must the unsupported length in upsetting not exceed about 3 times the diameter? A. The bar would cool too fast B. The die would crack C. The bar would buckle (bend) D. The grain flow would be cut Answer: C. A longer unsupported bar bends sideways instead of upsetting uniformly. (Key point: Buckling limit in upsetting) 3. What is the purpose of fullering? A. Cutting the hot bar with a set B. Enlarging a hole with a drift C. Welding two bars by hammering D. Making grooves across the bar to spread metal in length and form shoulders Answer: D. A fuller makes grooves that spread the metal lengthwise (before drawing down) and form shoulders. (Key point: Fullering) 4. Which pair of statements is correct? A. Punching: slug removed via pritchel hole; drawing down: length increased, cross-section reduced B. Punching: slug removed via pritchel hole; drawing down: length reduced, cross-section increased C. Punching: bar cut with a hot set; drawing down: grooves made across the bar D. Punching: hole enlarged by a drift only; drawing down: bar bent in a fork Answer: A. Punching drives out a slug through the pritchel/hardie hole; drawing down elongates the bar by reducing its section. (Key point: Punching and drawing down) ## Related in Workshop Technology - [Sheet metal cutting and forming operations](https://www.bctengineer.com/question.md?key=semester_2%2Fworkshop_technology%3Asheet-metal-operations-explained) — Workshop Technology, chapter 8 - [Upsetting diameter and force calculation](https://www.bctengineer.com/question.md?key=semester_2%2Fworkshop_technology%3Aupsetting-diameter-force-numerical) — Workshop Technology, chapter 9 - [Basic lathe operations](https://www.bctengineer.com/question.md?key=semester_2%2Fworkshop_technology%3Alathe-operations-explained) — Workshop Technology, chapter 6 - [Cutting tool materials and carbon steels](https://www.bctengineer.com/question.md?key=semester_2%2Fworkshop_technology%3Acutting-tool-materials-carbon-steels) — Workshop Technology, chapter 7 ## Related in other subjects - [Data structure and basic operations](https://www.bctengineer.com/question.md?key=semester_4%2Fdata_structure_and_algorithm%3Adata-structure-basic-operations) — Data Structure and Algorithm, chapter 1 - [Linked list and its basic operations](https://www.bctengineer.com/question.md?key=semester_4%2Fdata_structure_and_algorithm%3Alinked-list-and-operations) — Data Structure and Algorithm, chapter 4 - [Stack definition and basic operations](https://www.bctengineer.com/question.md?key=semester_4%2Fdata_structure_and_algorithm%3Astack-operations-algorithms) — Data Structure and Algorithm, chapter 2 - [Shear reinforcement and punching shear in footings](https://www.bctengineer.com/question.md?key=semester_7%2Fdesign_of_rcc_structure%3Ashear-reinforcement-and-punching-shear-in) — Design of RCC Structure, chapter 5