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Arts and Humanities
DT Product Design A Level Manufacturing + Joining Processes + Materials Tests
Terms in this set (66)
Heating and then cooling slowly
Heating and then quenching
Heating again but to a specific point for required hardness to toughness ratio. Follows the hardening of medium and high carbon steel, reduces brittleness.
Heating and maintaining high temperature so all the crystals can become uniform
The longer materials such as copper and aluminium are left the stronger and harder they get.
Heating in the presence of carbon to make the outer layer harder whilst maintaining a tough inner core
Case hardening but in a sealed ceramic box and left for longer to increase the thickness of the strong layer
Case hardening but in nitrogen. Used for special steels in aero-engines.
Blanking and Piercing
Plasma cutting + Laser cutting
Eg car body panels
Effectively Press forming but for decorative features
First blanks are 'cupped' then deep drawn. Eg drinks cans
Die casting/Gravity Die casting/Pressure Die casting/Industrial Die casting
Industrial uses a four or more slide die to allow for more complex shapes and designs.
Wax cast sprayed with clay then used as metal die and clay is shattered off.
High pressure compaction of powder in a die fuses particles together
Includes: Bending, drawing down (hammering thinner and thinner), punching and drifting, twisting and scrolling, drop forging (rough shape in between two hydraulic dies)
Used to make curved glass eg car windscreens
Lime-soda glass is floated on molten tin to form plate glass and cooled very slowly to reduce stresses
Types of Glass:
Toughened glass, coloured glass, lead crystal, pyrex, laminated glass (windscreens), self cleaning glass
Seam and Crimp Joint
Soft for electricals, hard for Jewellery
Welding for different metals, the actual metals are not melted just the filler. Uses flux to promote a good bond.
Welding, MIG and TIG
Materials must be the same. MIG uses consumable electrode whilts TIG uses a Tungsten, non-consumable electrode and a separate filer rod.
Electric Arc welding
Spot and Seam Welding
Mortice and tenon joint
Name three types of metal corrosion
Builds up a thick oxide layer when high current is passed through it, electroplating, sulphuric acid and lead as cathode.
Finely ground glass is sprayed onto the product. Then fired to form a scratch resistant layer. Can be built up in different colours.
Electrostatic attraction between powder and product when sprayed. Melted in oven to produce tougher finish then conventional paints. White goods are coated like this. Environmentally friendly.
The product is heated to above the softening point of the polymer which is in powder form. The product is dipped in the product and it adheres. Can then cool and set.
Definition of Ergonomics
The study of the interaction between the human body, products and the environment
Definition of Anthropometrics
The measurements and proportions of the human body
Two Types of Industrial Hardness Test
Brinell test: A hardened steel ball is forced into the materials surface by means of a suitable load. Surface area of indent is calculated and this gives a hardness value.
Vickers test: Same as Brinell but uses a diamond bit instead. Indent if measured using a microscope
An impact strength test
Izod/Charpy test uses a hammer that is pulled back and strikes the test piece in a pendulum like fashion. The greater the mass before the test piece breaks, the greater the impact resistance.
Every product has a buyer before its production begins., Reduces storage costs
Flexible Manufacturing Systems, FMS
THIS SET IS OFTEN IN FOLDERS WITH...
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