Production planning definition:
Functions of production planning:
A production planning and control system has following functions to perform, some before the arrival of raw materials and tools, and others while the raw material undergoes processing.
(1) Planning phase
- Forecasting: Estimation of type, quantity and quality of future work.
- Product design: Collection of information regarding specifications, bill of materials, drawings, etc.
B. Active planning :
- Process planning and routing: Finding the most economical process for doing a work and (then) deciding how and where the work will be done.
- Material control: Determination of the requirements and control of materials.
- Control: Determination of the requirements and control of tools used.
- Loading: Assignment of work to manpower, machinery, etc.
- Scheduling: lt is the time phase of loading and determines when and in what sequence the work will be carried out. It fixes the starting as well as the finishing time for the job.
(2) Action phase
Dispatching: It is the transition from the planning to the action phase. In this phase, the worker is ordered to start the actual work.
(3) Control phase
(i) Progress reporting.
- Data regarding the job progress is collected.
- It is interpreted by comparison with the present level of performance.
(ii) Corrective action.
- Expediting: It means taking action if the progress reporting (j) indicates a deviation of the plan from the original set targets.
- Replanning: Replanning of the whole affair becomes essential, in case expediting fails to bring the deviated plan to its actual (right) path.
Types of Production System
Continuous Production System
It involves a continuous or almost continuous physical flow of material. It makes use of special purpose machines and produces standardized items in large quantities e.g. chemical processing, cigarette manufacturing, and cement manufacturing
Classification of Continuous Production System
- Mass and flowline production
- Continuous or process production.
Intermittent Production System
It is specified by the intermittent or interrupted flow of material through the plant. It makes use of general-purpose machines and produces components different in nature and in small quantities. e.g. machine shops, repair and maintenance shops, welding shops, etc.
Classification of Intermittent Production System
- Batch production
- Job production.