GB/T 7925-2021 in English
VALIDNC reciprocating traveling type wire electrical-discharge machines—Parameters
- Issued on:2021-05-21
- Implemented on:2021-12-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$107.00
《GB/T 7925-2021数控往复走丝电火花线切割机床 参数》由TC161（全国特种加工机床标准化技术委员会）归口，主管部门为中国机械工业联合会。
Introduction
Background of Standard Revision and Technological Evolution
As the core specification in the field of EDM, this standard has undergone two major revisions since its first release in 1987. Compared with the 2005 version, the 2021 version mainly reflects the technical development of CNC reciprocating wire EDM machine tools in the following aspects:
- Parameter range adjustment brought about by the improvement of machining accuracy requirements
- Standardization requirements of new machine tool structure (double column)
- Improvement in coordination with international standards
Interpretation of key technical changes
| Parameter items | Requirements of the 2005 version | Requirements of the 2021 version | Technical impact |
|---|---|---|---|
| X/Y/Z axis travel | ≤500/400/300mm | ≤800/600/400mm | Adapt to large-size workpiece processing |
| Maximum cutting slope | Taper≤15° | Slope≤30° | Terminology specification and process extension |
| Maximum workpiece weight | ≤500kg | ≤1000kg | Heavy-duty processing capability improvement |
Machine tool type classification
The new standard clearly divides CNC reciprocating wire EDM machine tools into:
- Single-column machine tools: Suitable for processing small and medium-sized precision parts
- Dual-column machine tools: Meet the needs of large-span, high-stability processing
Typical case: The DK77 series developed by Suzhou Electro-Processing Research Institute adopts a dual-column structure to achieve a repeatable positioning accuracy of ±0.005mm.
Implementation suggestions
It is recommended that enterprises focus on the following during the standard conversion process:
- Equipment selection and matching under the new parameter system
- Recalibration of slope processing process parameters
- Vibration suppression scheme for dual-column machine tools
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