Machining task for the Litz LU 620 with Heidenhain iTNC 640
Component description: Lens holder
Quantities: 160 parts per month
Batch sizes: 40 units
Material: ALMg4.5 Mn0.7
Special material properties:
The material expands in an atypical way during anodizing, so the tolerances are exceeded by approx. 0.8/1000 during milling. After anodizing, the material expands into the tolerance range. Otherwise, the material is relatively easy to machine.
General description of the machining process and its challenges:
- 2/100 axial parallelism in space at 2° swivel
- 90° swivel in B-axis and 88° in C-axis
Accuracy of the finished part:
The accuracy requirements refer to at least 3 axes specified in the drawing. Holes and fits must be manufactured with up to 2/100 axial parallelism. The extremely high requirement for spatial accuracy is accompanied by an enormous scope of machining. Numerous operations are performed using over 40 tools. Each tool must be perfectly calibrated, and the positioning repeatability of the machine is subject to the highest requirements.
Required tools: 42 units
Measures taken on the machine side to achieve the objective:
- Optimization of temperature compensation
- Various approach strategies programmed for high-precision machining.
- Repeated approach of critical points in feed with post-positioning control.
