RT Journal Article
T1 Automatic Expanding Mandrel with Air Sensing Device: Design and Analysis
A1 Soriano Heras, Enrique
A1 Rubio Alonso, Higinio
A1 Bustos Caballero, Alejandro
A1 García Prada, Juan Carlos
AB In precision machining, expanding mandrels are used for jobs with close tolerances.An expanding mandrel consists of a tapered arbor or shaft, with a thin-slotted clamping sleeve orcollet made of hardened steel. The internal tapered and external cylindrical surfaces are groundto a high degree of accuracy, and the mandrel expands to fit the internal bore of the workpiece.Expanding mandrels are, essentially, wedge mechanisms. This paper proposes an automatic expandingmandrel with a novel force transmission system for high stiffness within a novel air sensing system,which allows detection of the correct part position before starting machining. A computationalmodel for determining the dynamic clamping force of the proposed mechanism is developed andimplemented using MATLAB. This model considers the influence of the sti ness behaviors of thecollet, force transmission structure and workpiece. Additionally, this paper presents the finite elementmethod analyses which were conducted to check the proposed computational model. The amount ofclamping force transmitted by a collet chuck holder depends strongly on: clearances, wedge angle,stiffness of the collet chuck holder and workpiece stiffness.
PB MDPI
SN 2076-3417
YR 2020
FD 2020-04-08
LK https://hdl.handle.net/10016/32835
UL https://hdl.handle.net/10016/32835
LA eng
DS e-Archivo
RD 1 sept. 2024