GB/T 20957.1-2007
Test conditions for precision machining centres.Part 1:Geometric tests for machines with horizontal spindle and with accessory heads(horizontal Z axis) (English Version)

Standard No.

GB/T 20957.1-2007

Language

Chinese, Available in English version

Release Date

2007

Published By

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China

Latest

GB/T 20957.1-2007

Scope

This part specifies the geometric accuracy requirements and inspection methods of precision horizontal machining centers (horizontal Z-axis). This part applies to precision horizontal machining centers with essentially four numerically controlled axes, of which three linear axes (X, Y, Z) travel up to 2 000 mm and one rotary axis (B´), also applies to sliding spindles, Additional movement of ram or additional universal spindle head in three different forms. This part lists the inspection items of three possible additional universal spindle heads in the appendix: ——Appendix A (normative appendix): 45° bipartite indexing spindle head, with mechanical indexing of two objects at different angular positions , the corresponding inspection items (AG1 ~ AG9) only check the final position of the spindle. ——Appendix B (normative appendix): Rotary spindle head with two numerically controlled rotary axes perpendicular to each other (inspection items BG1~BG7). ——Appendix C (normative appendix): 45°half-divided continuous indexing spindle head, similar to the first form, but with continuous indexing of two CNC rotary axes, the corresponding inspection items (CG1~CG7) should check the influence All geometric properties (plane and axis) of the final position of the spindle, except for the positioning accuracy of the two rotary axes; if their movement and locking permit, these inspection items can be used for more in-depth tests on the 45° split spindle head. Precision horizontal machining centers with a linear axis stroke greater than 2 000 mm can also be used as a reference.

GB/T 20957.1-2007 Referenced Document

• GB/T 17421.1-1998 Test code for machine tools. Part 1: Geometric accuracy of machines operating under no-load or finishing conditions

GB/T 20957.1-2007 history

• 2007 GB/T 20957.1-2007 Test conditions for precision machining centres.Part 1:Geometric tests for machines with horizontal spindle and with accessory heads(horizontal Z axis)

GB/T 20957.1-2007 -All Parts