ISO 8636-2:2024 工作機械 ―橋形フライス盤の試験条件―その2 走行橋形（門型）機械の精度試験 | ページ 2

Foreword

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This document was prepared by Technical ISO/TC 39, Machinetools, Subcommittee SC 2, Test conditions for metal cutting machine tools.

This third edition cancels and replaces the second edition (ISO 8632-2:2007), which has been technically revised.

The main changes are as follows:

• the references in the Observations section of test tables have been updated to ISO 230-1:2012;
• the terminology and designation of axes have been revised to better represent current technology;
• preliminary remarks subclauses have been revised to be consistent with the latest revisions of machine-tool specific standards;
• tolerances for tests related to long axes (with travel lengths greater than 5 000 mm) have been introduced;
• tests for straightness and angular errors of Z-axis motion have been added;
• tests for straightness and angular errors of cross-rail W-axis motion have been added;
• tests for rotary table, C’-axis, have been added;
• tests for geometric accuracy of axis of rotation have been moved to Annex A;
• machining tests have been excluded considering that such tests can typically be the object of agreement between the manufacturer/supplier and the user, (possibly) including tests that are specified in ISO 10791-7;
• the test for table flatness (former G9) has been deleted because the table surface is not normally used as a reference for the orientation of the workpiece, and, for tests made during the working life of the machine tool, the surface can be unsuitable for accurate measurements on these large machine tools;
• the tests for swivelling spindle heads (former G15 and P7) have been deleted as such heads are not in the scope of this document; they will be considered in a future standard.

A list of all parts in the ISO 8636 series can be found on the ISO website.

Introduction

A bridge-type milling machine is a numerically controlled machine tool capable of performing multiple machining operations, including milling, boring, drilling and tapping, as well as automatic tool changing from a tool magazine or similar storage unit according to a machining program. Its main difference from the typical vertical machining centre, dealt with in ISO 10791-2, is in the size (the X-axis is longer than 5 m) and its typical configuration is based on the following features:

• a large fixed table where large workpieces can be located;
• all motions along the three coordinate axes belong to the tool, in the following order:
  • a vertical slide or ram moves vertically along the Z-axis.
  • a horizontal slide moves on the cross-rail along the Y-axis;
  • the travelling bridge moves on the bed along the X-axis.

1 Scope

This document specifies, with reference to ISO 230-1, ISO 230-2 and ISO 230-7, geometric tests and tests to check the accuracy and repeatability of positioning of numerically controlled axes for general-purpose, normal accuracy bridge-type milling machines with a travelling bridge (gantry-type). This document also specifies the applicable tolerances corresponding to the above-mentioned tests.

This document provides the terminology used for the identification of the principal components of the relevant machine tools and the designation of axes with reference to ISO 841.

This document is applicable to machine tools with travelling bridge and fixed table. This document does not include single-column (open-sided) machine tools and those with fixed bridge and moving table.

This document deals only with the verification of the accuracy of the machine tool. This document does not apply to the testing of the machine tool operation (vibration, abnormal noise, stick-slip motion of components, etc.) nor to machine tool characteristics (such as speeds and feeds), which are generally checked before testing the accuracy.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 230-1, ISO 230-2, ISO 230-7 and the following apply.

ISO and IEC maintain terminology databases for use in standardization at the following addresses:

Bibliography