What is Process planning?
Process planning:-
Process planning is defined as the
systematic determination of methods by which a product is to be manufactured
economically and competitively.
It can also be defined as “The systematic determination of the processes by which a product is to
be manufactured economically & competitively”.
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Principle of process planning:-
Concept of process planning:-
i) Selection of machines.
ii) Combining
operations wherever possible.
iii) Specifying
inspection stages.
iv) Specifying
tools, Jigs, Fixtures required for process.
Defining Process Planning is the:-
1. In general, the inputs to Process Planning are:
2. Design data
3. Raw material data
4. Facilities data (machining data, tooling data, fixture
data etc)
5. Quality requirements data
6. Production type data
The output of process planning is the process plan:-
1. Process Plan Sheet
2. Process Sheet
3. Operation Sheet
4. Planning Sheet
5. Route Sheet
6. Route Plan
7. Part Program
Process Planning has many following important functions:-
1. To determine the basic manufacturing process.
2. To determine the sequence of operations.
3. To determine the equipment's and tooling required.
Who does Process Planning ?
1. Traditionally, Process Planning is done by manufacturing engineers
who are familiar with the particular processes in the factory and are able to
read engineering drawings.
2. Based on their Knowledge, skill and experience, they
develop the processing steps in the most logical sequence required to
make each part.
3. Some details are often delegated to specialists, such as
tools designers.
The following information is needed to develop a process plan:-
1. Knowledge of Various manufacturing processes.
2. Engineering drawing of the component.
3. Knowledge of various tooling and fixtures.
4. Relative costs of various processes, tooling and raw
materials.
5. Resources available in the factory.
6. Ability to do computations on machining time and cost.
7. Knowledge to use reference books, such as maintainability
data handbook.
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Advantages of Process planning:-
1. Improved accuracy,
2. Reduced labor cost,
3. Reduced plant fixed cost,
4. Less tooling required,
5. Less handling required,
6. Fewer setups,
7. Smaller in process inventory,
8. Less scrap,
9. Fewer inspection points required.
Disadvantages of process planning:-
1. Maintaining tool accuracy,
2. Possible higher tool costs,
3. Maintaining dimensions for several baselines,
4. More costly setups,
5. Sometimes scrap is increased,
6. Compromises on operational speed,
7. Chip disposal.
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