Handling Ambient Temperature Changes in Correlative Thermal Error Compensation

Thermal errors are one of the lead causes for positioning inaccuracies in modern machine tools. These errors are caused by various internal and external heat sources and sinks which shape the machine tool's temperature field and thus its deformation. Model based thermal error prediction and compensation is one way to reduce these inaccuracies. A new composite correlative model for the compensation of both internal and external thermal effects will be presented. It was trained using a large number of FE simulations and validated online in a machine tool with measurements in a climate chamber.