How to Improve CNC Machining Productivity?
- What are the factors that affect the process allowance?
1. Dimension tolerance Ta of the upper process;
2. Surface roughness Ry and surface defect deep Ha generated by the upper process;
3. The space error left by the upper process
- What is the composition of time quota?
T quota =T single piece time + T final time /n pieces
What are the process ways to improve productivity?
1. Shorten the basic time;
2. Reduce the overlap between auxiliary time and basic time;
3. Reduce the time to arrange the working place;
4. Reduced preparation and termination time
What are the main contents of the assembly process procedures?
a) Analyze product drawings, divide assembly units and determine assembly methods;
b) Formulated assembly sequence and divided assembly process;
c) Calculate the assembly time quota;
d) Determine the technical requirements of each process assembly, quality inspection methods and inspection tools;
e) Determine the transportation mode of assembly parts and the required equipment and tools;
f) Select and design the tools, fixtures and special equipment required in the assembly process
What should be considered in the assembly process of machine structure?
a) The machine structure shall be able to be divided into independent assembly units;
b) Reduce the repair and machining during assembly;
c) Machine structure should be easy to assemble and disassemble
What does assembly accuracy generally include?
1. Mutual position accuracy;
2. Precision of mutual motion;
3. Precision of mutual coordination
What problems should be paid attention to when looking for assembly dimension chain?
1. The assembly dimension chain shall be simplified as necessary;
2. Assemble "one piece and one link" composed of dimension chain;
3. "Directionality" of assembly dimension chain In the same assembly structure, when assembly accuracy is required in different positions in different directions, assembly dimension chain should be supervised in different directions
