ISO 230-7:2015 pdf free
ISO 230-7:2015 pdf free.Test code for machine tools – Geometric accuracy of axes of rotation
This part of ISO 230 is aimed at standardizing methods of specification and test of the geometric accuracy of axes of rotation used in machine tools. Spindle units, rotary heads, and rotary and swivelling tables of machine tools constitute axes of rotation, all having unintended motions in space as a result of multiple
sources of errors.
This part of ISO 230 covers the following properties of rotary axes:
– axis of rotation error motion;
– speed-induced axis shifts.
The other important properties of rotary axes, such as thermally induced axis shifts and environmental temperature variation-induced axis shifts, are dealt with in ISO 230-3.
This part of ISO 230 does not cover the following properties of spindles:
-angular positioning accuracy (see ISO 230-1 and ISO 230-2);
-run-out of surfaces and components (see ISO 230-1);
-tool holder interface specifications;
-inertial vibration measurements (see ISO/TR 230-8);
-noise measurements (see ISO 230-5);
-rotational speed range and accuracy (see ISO 10791-6 and ISO 13041-6);
-balancing measurements or methods (see ISO 1940-1 and ISO 6103);
The measuring instruments recommended here are only examples. Other instruments capable of measuring the same quantities and having the same or smaller measurement uncertainty can be used.
a) For spindle measurements, non-contact linear displacement sensor insensitive to metallographic variations of the test artefact with adequate range, resolution, thermal stability, accuracy, and bandwidth. The required bandwidth depends upon the number of undulations per revolution it is desired to resolve, and the speed range of the spindle. For most machine tools, a bandwidth of 10 kHz is acceptable for rotational speeds of up to 6 000 r/min. Such a displacement sensor is capable of detecting up to 50 undulations per revolution at this speed. In many cases, such high number of undulations is not expected in machine tool spindles; therefore, higher spindle speeds can be accommodated using sensors with 10 kHz bandwidth. In general, proportionally higher bandwidths might be required for higher spindle speeds and higher number of undulations (see Table H.1). For rotary table/head measurements, contact-type linear displacement sensors can also be used.
b) Data acquisition equipment, such as a computer-based system to sample and store displacement data for subsequent analysis.
c) Test-mandrel, with the design to be specified in machine-specific standards or agreed between supplier/manufacturer and the user, see ISo 230-1:1996, A.3;ISO 230-7 pdf download.
