Open AccessEXPERIMENTAL DEFINITION OF BASING ACCURACY AND TOOL FASTENING
Author(s) -
O. Yu. Kazakova,
O. Yu. Kazakova,
L. B. Gasparova,
L. B. Gasparova
Publication year - 2019
Publication title -
vestnik brânskogo gosudarstvennogo tehničeskogo universiteta
Language(s) - English
Resource type - Journals
ISSN - 1999-8775
DOI - 10.30987/article_5d9317b24f2524.52540627
Subject(s) - ovality , rigidity (electromagnetism) , machine tool , engineering , position (finance) , mechanical engineering , structural engineering , computer science , finance , economics
There are presented results of experimental investigations allowing the definition of factors (parameters) influencing the accuracy of basing and fastening a tool in a machine spindle.
The plant design developed allows modeling the work of elements and mechanisms of a spindle unit of a jig-boring machine (JBM) at the moment of tool changing.
The series of experiments carried out allowed drawing the following conclusions:
- the accuracy of a tool installation in a machine spindle depends upon its angular position in a spindle taper;
- angular errors of a tool cone element decrease a rigidity of a “spindle-tool” subsystem by 10…15%;
- elastic movements in the area of a contact increase by 2-2.5 times at the presence of ovality in the cross-section of a holder (at ovality 18mkm);
- the accuracy of tool location in a spindle increases with the increase of an axial tightening force (recommended tightening force – 3 ≤ Ptight. ≤ 5kN);
- the holder operation results in the rigidity decrease of a tool system by 10…15% (operation term – 5 years).