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Injection Molding Cycle

The injection molding cycle is controlled by very precise timers.These time controllers are either of analog or digital design and are used to control the machine's operations precisely to within fractions of seconds.Most timers are digital, as they can be set more precisely.
The three phases of cycle time control are injection time,cooling time and ejection time.Because precise control of the molding cycle and part quality go hand in hand, select the most accurate timers for repeatable control of each cycle.Profitability is also closely tied to the molding cycle.Piece-part price is based on the overall cycle time required to make a part, and a molder wants to produce the parts in minimum cycle that ensures part quality and positive return for labor.

(Total quality process control for injection molding 2nd edition, M.Joseph Gordon, p.295)

Microactuators

Like a sensor an activator converts a physical variable of one type into another type but the converted variable usually involves some mechanical action(e.g. a piezoelectric device oscillating in response to an alternating electric field).An actuator causes a change in a position or the application of force.Examples of microactuators include valves , positioners ,switchers ,pumos and rotational and linear motors.

(Fundamentals of modern manufacturing;materials,processing and systems , Mikel P.Groover,p.855)

Gripper

Grippers are designed to grasp and move objects during the work cycle.The objects are usually workparts and the end effector must be designed for the specifically for the part.Grippers are used for part placement applications ,machine loading and unloading ,and palletizing.

(Fundamentals of modern manufacturing;materials,processing and systems , Mikel P.Groover,p.910)

Inventory control

Inventory control is concerned with achieving a balance between two competing objectives 1)minimizing the cost of maintaining inventory and 2) maximizing service to customers.Inventory costs include investment costs,storage costs and the cost of possible obsolescence or spoilage.Investment cost is often dominant factor ; a typical case is when the company invests borrowed money at a certain interest rate in materials that have not yet been delivered to the customer.

(Fundamentals of modern manufacturing;materials,processing and systems , Mikel P.Groover,p.962)