1.27 Processing Materials Flashcards
Explain the process of Steam-Bending Timber.
Place the piece of timber into the steam chest set to a constant 100°C.
Amount of time needed varies(some need 1h per 25mm of thickness).
Once it is ready take it out and secure it to a jig in its bent position and le it dry out completely.
Which way should you bend timber when laminating? Why?
Against the grain 90° so that it doesn’t snap.
How do you Laminate timber as a manufacturing process.
Glue together many layers of thin veneers, saw cut strips with the grain goin gin the same direction put it between a jig/former and clamp it down.
Additional:
Using a bag press you can form small curves in lamina. The layers are taper over a former then put in a bag. The air in the bag is vacuumed out compressing the lamina.
Explain Laminating as a finishing process.
Paper sandwiched between to sheets of transparent polypropylene film that is glued to the paper as it is put through as heating wedge under high pressure.
Explain Die Cutting.
A piece of carton board is put between a platen and the die-form. Pressure is then applied, the carton board is cut and put into the die. Ejector pins on the die-form separate the needed part and eject the waste material.
What are the 2 different types of Water Jet Cutting?
Water Jet Cutting (Just water)
Abrasive Cutting (Water and an Abrasive Powder)
What materials can you cut using a Water Jet Cutter((No)/Powder)?
Aluminum
Rubber
Copper
Wood
Titanium
Brass
Plastic
What are the positives and negatives of using an Abrasive Powder in Water Jet Cutting.
Pros
Much more Precise
More Efficient
Stronger stream
Cons:
Much more expensive.
How does a Laser cutter work?
A high-powered laser controlled by a computer is used to cut material by either melting, burning or vaporising material leaving an edge with a very high-quality surface. Laser cutters are used on materials a die cutter wouldn’t be able to cut such as wood or plastic.
What are the 2 ways printing industries use laser cutters?
Direct Laser Imaging - Carbon Dioxide laser imaging head is used to remove unwanted material and make a negative printing plate from digital data.
Direct Laser Engraving - Flexographic and gravure printing plates/cylinders using high-power carbon dioxide laser head to form shar relief images with steep, smooth edges.
What are the advantages of using laser cutting over mechanical cutting?
No physical contact = clean edge
Very precise as laser doesn’t wear after use and are controlled by a computer
Plastics won’t melt or warp apart from the desired area as there is a small heat zone.
Can cut things that can’t be cut with traditional methods.
What are the disadvantages of Laser Cutting?
Very Expensive Machinery
Laser require a lot of power
What are some of the CAM machines?
Lathes
Routers
Milling Machines
Laser Cutters
How does CAM work?
Takes designs made in CAD and a computer will guide the machine through the manufacturing process making the product.
Also known as Computer Numerical Control (CNC).
Explain the purpose of the CNC Machine: Router/Engraver
Engraves grooves and profiles into material
Wood
Foam
Explain the purpose of the CNC Machine: Milling Centres
Used to create very complex contours as well as internal and external profiles.
Metals
Explain the purpose of the CNC Machine: Lathes
Cylindrical contouring
Work piece is spun while the outside is shaped into the desired form.
Metal
Explain the purpose of the CNC Machine: Laser Cutters
What type of lasers are used in school and in industry?
Accurate/precise cutting leaving a clean edge.
Schools use CO2 lasers
Industry uses high intensity beams of light.
Plastic
Wood
Card
Metal
