past paper
The Hong Kong Polytechnic University
ISE 329 Design for Manufacture and Environment
Lab Report DFA –Key Punch
Introduction
In this laboratory, we are required to choose one existing product to modify its design for assembly. In order to prevent complication, we have chosen a hole-puncher with 13 parts which is reasonable for making improvement in assembly process.
In this laboratory, we used DFA software to analysis different parts of the hole -puncher in order to reduce production cost, time to market and improve product quality. After the laboratory, we have successfully made some improvements for the assembly of the hole-puncher.
Parts of the Key puncher
Top view
Side View
Back view
Front view
Internal view
There are total 13 parts with 7 species in the original key punch:
1. Base
2. Arm
3. Puncher
4. Spring
5. Top
6. Screw
7. Plastic Cover
Improvement Method
In this laboratory, we apply DFA in order to pursue three goals—reducing production cost, time to market as well as improving product quality.
In our project, we focus on reducing part counts and time for assembly.
Reducing Part Counts
For reducing part counts, the reasons for us to do so are to ensure better quality, inventory control and help to reduce cost.
If fewer parts are involved in the production, there is less chance for occurrence of defect problem. Furthermore, it can help to reduce inventory problem such as leading time and shortage and thus has the better inventory control.
There are three steps to check whether the part counts can be reduced. The first criteria is whether the part is movable; second one is whether the part has to be made from different material than the other parts and the final one is whether the part required for assembly or disassembly. If all the answers are no, the part’s function can be combined with another existing part.
Part #
ISE 329 Design for Manufacture and Environment
Lab Report DFA –Key Punch
Introduction
In this laboratory, we are required to choose one existing product to modify its design for assembly. In order to prevent complication, we have chosen a hole-puncher with 13 parts which is reasonable for making improvement in assembly process.
In this laboratory, we used DFA software to analysis different parts of the hole -puncher in order to reduce production cost, time to market and improve product quality. After the laboratory, we have successfully made some improvements for the assembly of the hole-puncher.
Parts of the Key puncher
Top view
Side View
Back view
Front view
Internal view
There are total 13 parts with 7 species in the original key punch:
1. Base
2. Arm
3. Puncher
4. Spring
5. Top
6. Screw
7. Plastic Cover
Improvement Method
In this laboratory, we apply DFA in order to pursue three goals—reducing production cost, time to market as well as improving product quality.
In our project, we focus on reducing part counts and time for assembly.
Reducing Part Counts
For reducing part counts, the reasons for us to do so are to ensure better quality, inventory control and help to reduce cost.
If fewer parts are involved in the production, there is less chance for occurrence of defect problem. Furthermore, it can help to reduce inventory problem such as leading time and shortage and thus has the better inventory control.
There are three steps to check whether the part counts can be reduced. The first criteria is whether the part is movable; second one is whether the part has to be made from different material than the other parts and the final one is whether the part required for assembly or disassembly. If all the answers are no, the part’s function can be combined with another existing part.
Part #