Lecture 7: Production Engineering PDF

FACULTY OF APPLIED ARTS PRODUCT DESIGN DEP. LEVEL : 1 COURSE TITLE : PRODUCTION ENGINEERING ASSISTANT PROF. : M.MOHAMED RYEAD LECTURE : 7 2- Flame/Thermal Cutting 2-1- Oxygen-Acetylene Cutting ❑ acetylene and oxygen gases are mixed in a cutting...

FACULTY OF APPLIED ARTS PRODUCT DESIGN DEP. LEVEL : 1 COURSE TITLE : PRODUCTION ENGINEERING ASSISTANT PROF. : M.MOHAMED RYEAD LECTURE : 7 2- Flame/Thermal Cutting 2-1- Oxygen-Acetylene Cutting ❑ acetylene and oxygen gases are mixed in a cutting attachment chamber and ignited using a special tip. ❑ As the metal is heated to a critical temperature, the flow of oxygen is increased, which oxidizes the metal and creates a cut through the plate. ❑ Steel plates up to 6" thick can be easily cut using this process. 2-2- Plasma-Arc Cutting ❑ Plasma-arc cutting (PAC) produces temperatures higher than those in the oxygen-acetylene process and is therefore more productive. ❑ It produces a smooth cut and is used to cut non- ferrous and stainless steel, can easily be automated, and has become the most popular method of thermal cutting. ❑ A real advantage over oxygen-acetylene cutting is that it is more compact and does not require cumbersome gas tanks and awkward hoses. ❑ It does require a high-voltage power source. ❑ Uses plasma stream operating at very high temperatures to cut metal by melting The punch is a plasma arc (a slit made by cutting,)  How a Plasma Cutter Works An arc is used to ionize‫تأين‬ the gas around a high voltage arc This ionized gas is superheated by the arc to plasma In the plasma state, the gas is at 30,000˚F, reducing the steel to a molten state, allowing the stream of gas to push it out of the cut  Laser Beam Machining (LBM) Uses the light energy from a laser to remove material by vaporization and cutting out The punch is a light beam Laser Beam Machining (LBM) Water-jet cutting machine