Q: Heat Treatment ( තාප සැකසීම) ක්රම මොනවාද? Annealing, Hardening සහ Tempering අතර වෙනස කුමක්ද?

Heat Treatment (ශාපිය ද්රව්ය ගුණ වෙනස් කිරීමේ ක්රම): Annealing (ඇනීලින්): Metal high temperature දක්වා heat කර slowly cool — softens metal, removes internal stresses, improves machinability. Hardening (දෘඩ කිරීම): Metal critical temperature (above Ac3) දක්වා heat කර rapidly quench (water/oil) — increases hardness & strength, decreases ductility. Tempering (Tempering): Hardened metal reheating to below critical temp then cooling — reduces brittleness, improves toughness while retaining hardness. Normalizing: Annealing ට සමානයි, air cooling — fine grain structure. Case Hardening / Carburising: Only surface layer harden කෙරේ — gears, shafts. A/L Engineering Technology Lesson 08 හිදී heat treatment diagrams සහිතව ඉගෙනගනී.

Question 1

A/L Engineering Technology Lesson 08 — නිෂ්පාදන තාක්ෂණවේදය හි ඇතුළත් ප්‍රධාන මාතෘකා මොනවාද?

Accepted Answer

A/L Engineering Technology Lesson 08 'නිෂ්පාදන තාක්ෂණවේදය' (Production Technology) හි ප්‍රධාන මාතෘකා: Manufacturing Process Classification, Casting (Sand casting, Die casting, Investment casting), Forging (Hot & Cold forging, Drop forging), Machining (Turning, Milling, Drilling, Grinding), Welding (Arc welding, MIG, TIG, Spot welding), Sheet Metal Work, Heat Treatment (Annealing, Hardening, Tempering), CNC Machine Tools, Jigs & Fixtures, සහ Quality Control in Manufacturing. මෙම පාඩම Unit 3 යටතේ ET-L08 ලෙස ගැනේ.

Question 2

Casting, Forging සහ Machining නිෂ්පාදන ක්‍රම (Manufacturing Processes) අතර වෙනස කුමක්ද?

Accepted Answer

Casting (වාත්තු කිරීම): Molten metal mould/die හි flowing කර solidify — sand casting (රළු surface, low cost), die casting (smooth, high volume), investment casting (complex shapes, aerospace). Forging (හැඩගැසීම): Solid metal heating/pressing කර shape — hot forging (high temperature), cold forging (room temperature, better surface), drop forging (hammering). Machining (යන්ත්‍ර ගැනීම): Material remove කර shape — Turning (lathe, cylindrical), Milling (flat/contoured surfaces), Drilling (holes), Grinding (fine finish). Casting: complex shapes, large parts. Forging: strong grain structure, high strength. Machining: precise dimensions, fine finish. A/L Engineering Technology Lesson 08 හිදී සියලු processes ප්‍රායෝගිකව ඉගෙනගනී.

Question 3

A/L Engineering Technology Lesson 08 Production Technology notes PDF නොමිලේ download කරන්නේ කොහෙන්ද?

Accepted Answer

AL Tech Hub (altechhub.lk) හි Lesson 08 Downloads කොටසෙන් සියලු ලිපිගොනු නොමිලේ ලබාගත හැකිය: Full Notes PDF (7.5 MB, 100 pages), Manufacturing Processes Guide, Casting & Forging Illustrated PDF, Machining & Cutting Tools Notes, Welding Types Reference PDF, CNC Programming Basics, Slide Deck PPTX (10.0 MB, 64 slides), Practice Questions & Answers (DOCX), Past Paper Questions, සහ Complete Bundle (ZIP, 35 MB). ලියාපදිංචියකින් තොරව සෘජුවම download කළ හැකිය.

Question 4

Heat Treatment ( තාප සැකසීම) ක්‍රම මොනවාද? Annealing, Hardening සහ Tempering අතර වෙනස කුමක්ද?

Accepted Answer

Heat Treatment (ශාපිය ද්‍රව්‍ය ගුණ වෙනස් කිරීමේ ක්‍රම): Annealing (ඇනීලින්): Metal high temperature දක්වා heat කර slowly cool — softens metal, removes internal stresses, improves machinability. Hardening (දෘඩ කිරීම): Metal critical temperature (above Ac3) දක්වා heat කර rapidly quench (water/oil) — increases hardness & strength, decreases ductility. Tempering (Tempering): Hardened metal reheating to below critical temp then cooling — reduces brittleness, improves toughness while retaining hardness. Normalizing: Annealing ට සමානයි, air cooling — fine grain structure. Case Hardening / Carburising: Only surface layer harden කෙරේ — gears, shafts. A/L Engineering Technology Lesson 08 හිදී heat treatment diagrams සහිතව ඉගෙනගනී.

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නිෂ්පාදන තාක්ෂණවේදය —Production Technology

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නිෂ්පාදන තාක්ෂණවේදය —
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