Active coolant control onto thermal behaviors of precision ball screw unit

Electrodeposition of charged particles onto fuel cell coolant channel walls

Experimental Investigation of a Ball Screw for Increasing the Accuracy of Thermal Fe Simulations

Thermally induced displacements due to thermal expansions continue to present one of the main problem areas in the machine tool sector. To compensate displacements simplified thermal FE simulation models are developed, with which compensating calculations will be carried out online in the NC control computer in future (software in the loop). To increase the accuracy experimental tests are condu...

The Modelling and Correction of Ball-screw Geometric, Thermal and Load Errors on Cnc Machine Tools

In the modern global economy, there is a demand for high precision in manufacture as competitive pressures drive businesses to seek greater productivity. This results in a demand for a reduction in the errors associated with CNC machine tools. To this end, it is useful to develop a greater understanding of the mechanisms which give rise to errors in machine tool drives. This programme of resear...

Prediction of Thermal Deformation for a Ball Screw System Under Composite Operating Conditions

The position error of a feed drive system is mostly caused by thermal deformation of a ball screw shaft. A high-speed ball screw system can generate massive heat with greater thermal expansion produced, and consequently have a negative effect on the positioning accuracy. In this study, we applied the computational approach using the finite element method (FEM) to simulate the thermal expansion ...

On the Unit Ball

Let φ(z) = (φ1(z), · · · , φn(z)) be a holomorphic selfmap of B and ψ(z) a holomorphic function on B, where B is the unit ball of C n . Let 0 < p, s < +∞,−n− 1 < q < +∞, q+ s > −1 and α ≥ 0, this paper gives some necessary and sufficient conditions for the weighted composition operatorWψ,φ induced by φ and ψ to be bounded and compact between the space F (p, q, s) and α-Bloch space β.