Standard
Current
Test code for machine tools - Part 5 : determination of the noise emission
<p><b>1.1 General</b></p>
<p>This part of ISO 230 specifies methods for testing the noise of stationary floor-mounted machine tools and related</p>
<p>auxiliary equipment directly on the shop floor. The purpose of the measurements is to obtain noise-emission data</p>
<p>for machine tools.</p>
<p>The data obtained may be used for the purpose of declaration and verification of airborne noise emission from</p>
<p>machine tools as specified in ISO 4871, and also for the comparison of the performance of different units of a given</p>
<p>family of machine tools or equipment, under defined environmental conditions and standardized mounting and</p>
<p>operating conditions.</p>
<p>For the purposes of this part of ISO 230, "auxiliary equipment" means hydraulic power packs, chip conveyors,</p>
<p>coolant-oil mist extractors, heat exchangers, refrigerators, etc. Noise emitted by centrally operated auxiliary</p>
<p>equipment, connected to several machine tools, shall be considered as background noise.</p>
<p>General instructions are given for the installation and operation of the machine under test and for the choice of</p>
<p>microphone positions for the work station and for other specified positions. More detailed instructions can be found</p>
<p>in specific noise-test standards for individual types of machine tools.</p>
<p>Clause 11 specifies a method for measuring the emission sound pressure levels at work stations and at other</p>
<p>specified positions in the vicinity of a machine tool. This method follows the methods specified in ISO 11202 and</p>
<p>ISO 11204.</p>
<p>Clause 12 specifies a method for measuring the sound pressure levels on a measurement surface enveloping the</p>
<p>machine tool and for calculating the sound power level produced by the machine tool. This method follows the</p>
<p>methods specified in ISO 3744 and ISO 3746.</p>
<p>The determination of the sound power level on the basis of the intensity method (ISO 9614 and ISO 9614-2) is not</p>
<p>dealt with in this part of ISO 230.</p>
<p><b>1.2 Types of noise and noise sources</b></p>
<p>The method<i>s </i>specified in this part of ISO 230 are suitable for all types of noise emitted by machine tools.</p>
<p>This part of ISO 230 is applicable to machine tools of any type and size, including devices, components and subassemblies.</p>
<p>NOTE Measurements according to this part of ISO 230 may be impracticable for very tall or very long machine tools, such as transfer lines.</p>
<p><b>1.3 Test environment</b></p>
<p>The test environment that is applicable for measurements made in accordance with this part of ISO 230 is generally</p>
<p>located indoors, with one or more reflecting planes present, meeting specified requirements, as described in</p>
<p>clauses 11 and 12, respectively in 11.4.2 and in clause 12.3.2.</p>
<p><b>1.4 Accuracy grades</b></p>
<p>Individual values of emission sound pressure levels at a fixed position and of the sound power level of a machine</p>
<p>tool determined in accordance with the procedures given in this part of ISO 230 are likely to differ from the true</p>
<p>values by an amount within the range of the respective measurement uncertainties. The uncertainties in</p>
<p>measurements of emission sound pressure levels and in determinations of the sound power level arise from</p>
<p>several factors which affect the results, some associated with environmental conditions at the test site and others</p>
<p>with experimental techniques. This part of ISO 230 deals with methods to determine the emission sound pressure</p>
<p>levels and the emission sound power level, where the results meet grade 2 accuracy (engineering method) and</p>
<p>grade 3 accuracy (survey method). Because of its higher accuracy, grade 2 should be achieved whenever possible.</p>
<p>Specific information on measurement uncertainties is given in clause 7.</p>
<p>Although grade 2 accuracy (engineering) is preferred, grade 3 accuracy (survey) is acceptable for noise declaration</p>
<p>and most other purposes. In this part of ISO 230, only the determination of grade 3 is described completely. For</p>
<p>grade 2, ISO 3744 and ISO 11204 shall also be used.</p>
