EIE 3023
Manufacturing directly employs approx. ____________ people in the U.S.
21 Million
The principal components of an injection molding machine are which two of the following: (a) clamping unit, (b) hopper, (c) injection unit, (d) mold, and (e) part ejection unit?
Clamping Unit and Injection Unit
manufacturing products (2 things)
Consumer and Capital goods
Distinguish between generating and forming when machining work part geometries.
Generating - part geometry determined by feed of cutting tool Forming - part geometry is created by the shape of the cutting tool
What are the differences between rotational parts and nonrotational parts in machining?
Rotational - cylindrical or disk-like shape Nonrotational (also called prismatic) - block-like or plate-like
Manufacturing is important (3 things)
Technologically Economically Historically
What is the important properties of polymer melts?
Viscosity and Viscoelasticity
Manufacture is derived from two latin words manus and factus whats it mean
made by hand
manufacturing industries can be classified as (3 things)
primary secondary tertiary
An injection molding machine is divided into two practical components. Name them.
Injection Unit and Clamping Unit
What is the difference between the injection unit and the clamping unit?
Injection- melts and delivers polymer melt - operates much like an extruder Clamp- opens and closes mold each injection cycle
A facing operation is normally performed on which one of the following machine tools: (a) drill press, (b) lathe, (c) milling machine, (d) planer, or (e) shaper?
Lathe
Injection molding is a process in which a polymer is heated to a highly plastic state and forced to flow under high pressure into a mold cavity, where it solidifies and is then removed from the cavity: (a) true or (b) false?
True
Most vertical boring machines are equipped for both turning and boring and are used for large, heavy work parts with large diameters: (a) true or (b) false?
True
The twist drill is the most common type of drill bit: (a) true or (b) false?
True
What are some of the reason why plastic shaping processes are important?
- Almost unlimited variety of part geometries - Plastic molding is a net shape process - Less energy is required than for metals - Painting or Plating is usually not required
3 reasons why plastic shaping processes are important
- almost unlimited variety of part geometries - further shaping is not needed - painting or plating is usually not required
5 categories of plastics shaping processes, as classified by the resulting product geometry.
- extrusion - crating processes - thermoforming - casting - product design considerations
Describe the injection molding process
- polymer heated to highly plastic state - forced to flow under pressure into mold cavity - the molding is then removed from cavity
When the drill bit in a drilling operation exits the opposite side of the work, the resulting hole is called which one of the following: (a) a blind hole or (b) a through hole?
A through hole
A lathe can be used to perform which of the following machining operations (three correct answers): (a) boring, (b) broaching, (c) drilling, (d) milling, (e) planing, and (f) turning?
Boring, Drilling, and Turning
Which of the following are examples of generating the workpart geometry in machining, as opposed to forming the geometry (two best answers): (a) broaching, (b) contour turning, (c) drilling, (d) profile milling, and (e) thread cutting?
Contour Turning and Profile Milling
Machined parts can be classified as rotational or nonrotational. Which of the following are examples of operations that create nonrotational geometries (two best answers): (a) boring, (b) drilling, (c) milling, (d) planing, and (e) turning?
Milling and Planing
What is the difference between peripheral milling and face milling?
Peripheral Milling: - Cutter axis parallel to surface being machined - Cutting edges on outside periphery of cutter Face Milling: - Cutter axis perpendicular to surface being milled - Cutting edges on both the end and outside periphery of the cutter
Thermoforming is limited to which of the following plastic types?
Thermoplastics
Two types of Plastics
Thermoplastics - chemical structure remains unchanged during heating and shaping. Thermosets - undergo a curing process during heating and shaping, causing a permanent change.
Boring and reaming share the common feature that they are both used to enlarge an existing hole: (a) true or (b) false?
True
The term encapsulation refers to which one of the following plastics shaping processes?
casting
peripheral milling
cutter axis parallel to surface
face milling
cutter axis perpendicular
Stretch blow molding is a variation of which one of the following: (a) extrusion blow molding, (b) injection blow molding, or (c) rotational blow molding?
injection blow molding
