Processes Flashcards
(23 cards)
What is the Process of Injection Moulding
Granules of plastic are poured into a hopper to be stored.
The hopper then moves the granules onto a screw which is powered by a motor. As the Granules are moved along the screw they are moved through heaters which turns the plastic granules into molten plastic. This molten plastic is then forced through a die into a mould. Once the mould is full it is then cooled and the product is extracted.
What is the process of rotational moulding
Specific amounts of thermoplastic plastic granules are inserted into the mould. The mould is then clamped together and placed into a heated chamber. The mould is then rotated inside the chamber as as it rotates the plastic thermoplastic granules start to become molten and coat the surface of the mould. The mould is rotated until all of the surface of the mould is coated. The mould is then cooled and extracted.
What is the process of Vacuum Forming
A sheet of plastic is heated to a temperature suitable for forming.
A mould is then pushed into the plastic sheet and the vacuum is turned on and pumps out all of the air from beneath the sheet. The sheet has the shape of the former pressed into the surface.
What is the process of blow moulding
The plastic is fed into the hopper that stores it. Heated plastic granules are injection moulded into a pre-form shape which is positioned into a mould. Air is then forced into the mould which forced the plastic to the sided, giving the shape. The mould is then cooled and removed
What is the process of Thermoforming
Sheet plastic is held securely between the two halves of the mould.
The plastic is heated just above its softening point and then the mould halves close and a vacuum is applied through the lower mould. The upper mould ensures the required amount of detain is achieved.
What is the process of Vacuum forming
A sheet of plastic is heated to a temperature suitable for forming, a mould is then pushed up into the plastic sheet. The vacuum is turned on and pumps out all of the air beneath the sheet. The sheet then has the shape of the former pressed into its surface.
What is the process of plastic extrusion
Granules of plastic powder are poured into a hopper. A motor turns a thread which pushes the granules along a heated section, the heater softens the plastic which is then forced through a die and as the plastic leaves the die it is cooled and then the extruded product is cut to the required length.
What is the process of Calendaring
Pre mixed thermoplastic is fed into rollers. Rollers are heated to just above the softening point of thermoplastics. The plastic is then forced through a gap roller to determine the thickness of the final product. The final roller chills the material.
What is the process of Compression Moulding
A performed charge(Compressed plastic powder) is placed between the two halves of the mould. The mould is then heated that will allow the long chained molecules of the thermosetting plastic to fix together. The mould is closed and held together for a period of time that will allow all cross-links to be formed
What is the process of Dip Moulding
A mould is dipped into a bath of molten plastic, the mould is then removed and cooled. The end product is then removed from the mould
What is Blanking and Piercing
Blanking- When a part to be used is punched out of sheet metal
Piercing- When a sheet of metal has a hole punched through it.
What is Plasma cutting
When a stream of ionised gas which becomes so hot it vaporises the metal that is being cut
What is Laser Cutting
A highly accurate form of cutting and decorating material by using a fine beam of light controlled by a CNC machine
What is the process of Press- Forming
Sheet metal materials are loaded into a hydraulic press and clamped into the blank holder. The punch forces the material through the die so it takes the shape of the punch
What is the process of sand casting
A pattern is made
Each part of the pattern is placed on a base board and then a mould box half is placed over it.
Sand is packed around the pattern forcing it into contact with the pattern.
The pattern is then removed from the mould half
The mould halves are fitted together with locating pins ensuring correct alignment.
Molten metal is poured into the running gate.
Once the metal has solidified the mould is broken open.
What is the process of High Pressure De Casting
Molten metal is poured into a chamber.
An injection piston or plunger forces the molten metal under high pressure into the casting cavity
The pressure is maintained until the metal solidifies
Injector pins are used to push the components out of the die.
What is the Process of sintering
Materials are crushed into a powder.
The powder is compacted into a die, which will give the product its final shape.
The compacted shape is heated so that the powder particles bond.
What is the process of Drop Forging
Very large forces are exerted onto a pre-heated metal billet between the die halves
What is the Process of Wood Laminating
Adhesive is applied to each face of each veneer.
Each veneer is stacked on top of the other
The veneers are clamped into position
The adhesive dues and the shape is formed
What is the process of steam bending
Wood is placed inside of a steam box. Steam is then pumped into the box and over time the steam softens and allows the wood to become flexible and once its flexible it can be manipulated.
What is the process of Die Cutting
The sharp edges of the cutting die are brought down onto a thin sheet of material. The material can be cut, creased and perforated all on one single step.
What is the process of Brzing
The metal to be joined must first be cleaned so that grease and dirt is removed. Flux is brushed along the joint to prevent oxidisation taking place on the metal surfaces.
Pressurised gas and air is fed through a nozzle and ignited.
The joint is heated with the flame until it becomes so hot it becomes red in colour.
A brazing rod is then pushed gently against the joint and if the temperature is right the end of the rod will melt and begin to run along the joint. The rod is fed into the joint until a brazed joint is complete.
What is the process of TIG
TIG generates heat via an arc of electricity jumping from a electrode to the metal surfaces you intend to weld.
The heat is sufficient to melt the joint edges
The electrode is coated in flux which when melted, prevents the joint from becoming oxidised.
