GB/T 20957.2-2007Test conditions for machining centre -- Part 2: Geometric tests for machines with vertical spindle or universal heads with vertical primary rotary axis (vertical Z-axis) (English PDF)

Foreword

GB/T 20957 "Test conditions for precision machining centers" is divided into ten parts as follows.

--- Part 1. horizontal spindle and with head Geometric tests for machines (horizontal Z-axis);

Universal spindle head Geometric tests for machines (vertical Z-axis) or vertical with vertical primary rotary axis;. --- Part 2

--- Part 3. indexing or continuously indexing spindle head of the whole universal Geometric tests for machines (vertical Z-axis);

--- Part 4. positioning accuracy and linear and rotary axes repeatability test;

--- Part 5. Clamp the workpiece pallet positioning accuracy and repeatability of positioning accuracy test;

--- Part 6. feed rate, speed and accuracy test interpolation;

--- Part 7. finishing accuracy test specimen;

--- Part 8. Evaluation of the contouring performance in the three coordinate plane;

--- Part 9. tool pallet conversion and the conversion of the operating time of assessment;

--- Part 10. Evaluation of thermal effects.

This section GB/T Part of 220,957.

The partial modification of the use of ISO 10791-2:2001 "Test conditions for machining centers - Part 2. Vertical and vertical primary rotary axis with universal Geometric tests for machines spindle head "(in English).

This part of ISO 10791-2:2001 compared to the main technical content of the following modifications.

--- According to machine precision grade requirements, tolerance for all test items in ISO 10791-2:2001 is based on a compression (Compression common ratio of about 1.6);

--- In Chapter 1, "scope" to increase the "linear axis travel greater than 2000mm precision horizontal machining center can also refer use";

--- 3.2 increased level machine installation and inspection requirements at ambient temperature;

--- Remove the G6 item Inspection "c) within the XY plane (ECY)" test.

For ease of use, this section made the following editorial changes.

--- "This standard" be replaced by "this section";

"." --- With a decimal point instead of a comma as the decimal point, "";

--- Remove the ISO 10791-2:2001 Foreword and Introduction;

--- Title Chapter 3, "a brief description" to "General requirements";

--- Of ISO 10791-2:2001 and other international standards referenced with has been adopted as our national standard in place of the corresponding international standard;

--- Remove the ISO 10791-2:2001 references.

This section of the Appendix A, Appendix B, Appendix C is a normative appendix.

This part is proposed by China Machinery Industry Federation.

This part of the National Metal Cutting Machine Standardization Technical Committee (SAC/TC22) centralized.

This section drafted by. National Chiao Tung University Kunming Machine Technology Co., Ltd., Beijing Machine Tool Research Institute, Beijing Institute of milling machines, the machine is limited in the Czech Republic the company.

1 Scope

This section provides precision vertical machining centers (ie. vertical Z axis) requirements and test methods geometric precision.

This section applies to basically have three CNC axes, namely three linear axes (X, Y and Z) to 2000mm Precision Vertical plus Machining centers, but also to ram, or additional movement of the sleeve universal spindle head, such as. the rotation axis (A ', B' and C ').

This section lists the possible additional optional horizontal axis and two additional universal spindle head test items in the appendix.

--- Appendix A. optional horizontal axis (test items AG1 ~ AG6);

--- Appendix B. Rotary swing spindle head having a CNC rotary axis (test items BG1 ~ BG2);

--- Appendix C. rotary spindle head having two mutually perpendicular NC rotary axis (test items CG1 ~ CG7).

Linear axis travel greater than 2000mm precision vertical machining center can also refer to use.

2 Normative references

The following documents contain provisions which, through reference GB/T 20957 in this section constitute provisions of this section. For dated reference documents Member, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouraged to reach under this section Parties to research agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this section.

GB/T 17421.1-1998 Test code for machine tools - Part 1. under no-load or finishing conditions Geometric accuracy of machines (Eqv ISO 230-1:1996) ISO 8525-1:1990 for machine tool 800mm nominal size of the workpiece to the pallet ISO 8525-2:1990 machine tool parts is greater than the nominal size of 800mm workpiece pallet

3 General requirements

3.1 section all linear dimensions, tolerances and corresponding tolerances in millimeters, and the corresponding tolerance angle deviation ratio for general use Representation, but in some cases also for clarity micro radians or arc seconds, equivalent relational expression as follows.

0.010/1000 = 10 × 10-6 = 10µrad~2 "

3.2 This section should be used with reference to GB/T 17421.1, especially heating pre-installation testing tools, spindles and other moving parts, check Recommended precision test methods and testing tools. Installation of the machine level and ambient temperature should meet the following requirements.

--- Reference to GB/T 17421.1-1998 adjust the machine to install the 3.1 level, a level, vertical and horizontal readings does not exceed Specified by the manufacturer;

--- When test, the ambient temperature should be maintained at 20 °C ± 2 °C, machine tools and gages in place long enough for the measurement environment (preferably a lot in 12h), in order to ensure a steady state before the test.

3.3 part of the order given in the test project does not represent the actual test sequence. In order to test assembly and disassembly tools and testing convenience, any order for inspection.

3.4 inspection tools, according to the structural characteristics must not test all of the items in this section. For the purpose of acceptance testing requirements, the Users can obtain the manufacturer agreed to choose some interesting test items, but these items should be clearly stated at the time of ordering the machine.

3.5 part of an inspection tool inspection items noted in only examples. You can use the same tools and instructions have at least the same accuracy