Use and Characteristics of Machine Tools
This automatic processing line is composed of
- CG-27 joint cutting machine,
- CGK-24 CNC joint double-end scraping and drilling center hole machine,
- CGK-25 specific resistance and elastic modulus measuring machine,
- CGK-26 CNC joint double-outer taper lathe,
- CGK-21 CNC joint double-thread combing machine,
- CGK-28 CNC joint milling groove and drilling hole machine,
- CG-34 weighing machine,
- CG-29 frame automatic conveying line and automatic printer.
- CG-34 weighing machine,
- CG-29 frame-type automatic conveying line and automatic printer.
- CGK-25 is equipped with the function of measuring elastic modulus when exporting
This automatic machining line is a new generation of automatic machining line for fully numerical control joints. Patent No.: ZL 021 12654.2, the main processes are used in CNC machine tools, especially thread comb processing machine tools using full CNC technology, completely eliminating the mechanical transmission chain error, processing accuracy as a whole to reach, part of the international advanced level. Its control method is unique, each machine tool is controlled by the special high-performance CNC system and software developed by the company itself, which can be individually debugged and processed, and the whole line adopts Siemens PLC to realize linkage, with a high degree of automation and high production efficiency, and unmanned operation can be realized. At the same time, according to the user needs to be equipped with the upper computer and remote access, remote monitoring system.
Main Parameters
| Parameter Name | Unit | Type Ⅰ | Type Ⅱ |
|---|---|---|---|
| Processing Joint Diameter | mm | Φ120–Φ431mm (corresponding to Φ200–Φ800mm electrodes) |
Φ241–Φ488mm (corresponding to Φ450–Φ900mm electrodes) |
| Processing Joint Length | mm | 177–635mm (corresponding to Φ200–Φ800mm electrodes) |
241–685mm (corresponding to Φ450–Φ900mm electrodes) |
| Thread Single – Tooth Pitch Error | mm | ±0.015mm | ±0.015mm |
| Thread Pitch Accumulative Error | mm | ±0.025mm/150mm | ±0.025mm/150mm |
| Thread Hole Taper Tolerance | mm (angle) | ±20″ | ±20″ |
| Thread Profile Half – Angle Error | — | 30°±10′ | 30°±10′ |
| Four – Point Deviation of Double – End Thread | mm | ≤0.04 | ≤0.04 |
| Effective Diameter Error | mm | ≤0.05 | ≤0.05 |
| Z – Axis Pulse Equivalent | mm/pulse | 0.001 | 0.001 |
| X – Axis Pulse Equivalent | mm/pulse | 0.001 | 0.001 |
| Single – Piece Processing Time | min/piece | Large – size workpieces: 3min/piece; Medium – small size: 2min/piece |
Large – size workpieces: 5min/piece; Medium – small size: 3min/piece |
Product Introduction
1. Modularization of specifications: covering all sizes of electrode connectors
For graphite electrodes’ graded application scenarios (e.g. metallurgical arc furnace, chemical electrolyzer with different power requirements), the processing line adopts a dual model structure:
Type Ⅰ: focusing on medium/small size electrodes (suitable for Φ200-Φ800mm electrodes), processing joints with diameters of Φ120-Φ431mm and lengths of 177-635mm;
Type Ⅱ: for large-size electrodes (suitable for Φ450-Φ900mm electrodes), processing connector diameter Φ241-Φ488mm, length 241-685mm.
The modular design supports quick changeover production, and continuous processing of multi-specification joints can be realized through program calling and tooling switching, matching the flexible manufacturing demand of production lines.
2. Precise shape control system: guarantee the reliability of electrode connection.
The precision of graphite joints directly determines the conductivity stability and thermal shock resistance of the electrodes after assembly, so the machining line builds a multi-dimensional precision control system:
Thread pitch precision: single pitch error ±0.015mm, cumulative error within 150mm ±0.025mm, to ensure that the threads are screwed together “without hysteresis, high fit”, to avoid sudden changes in contact resistance when energized;
Geometric tolerance constraints:
Threaded hole slope ±20″ (very small angular deviation) to prevent graphite embrittlement due to stress concentration during assembly;
Tooth angle 30°±10′ to optimize thread load carrying capacity (dispersion of axial pressure);
Four-point deviation of double-end thread ≤ 0.04mm, effective diameter error ≤ 0.05mm, to ensure that the joint coaxiality ≤ 0.05mm, to support the stable transmission of high current.
3.micron-level motion control: breakthrough graphite processing limit
Graphite material is brittle and prone to chipping, and has strict requirements on the precision of processing trajectory:
The machining line is configured with 0.001mm/pulse X/Z-axis pulse equivalent, and the CNC system controls the tool trajectory with micron-level motion resolution, together with the self-adaptive cutting parameters (such as feed speed and depth of cut dynamically adjusted), to realize:
Thread surface roughness ≤ Ra0.8μm (smooth spinning surface, reducing the risk of galvanic corrosion);
Stable control of dimensional tolerances within ±0.02mm, to overcome the graphite “difficult to process, easy to break” process pain points.
4.efficiency grading design: matching the mass production beat
Based on the joint size and processing complexity, set up differentiated production beats:
Type Ⅰ: 3min/pc for large-size joints, 2min/pc for small and medium-size joints (suitable for large-scale production of medium-power electrodes);
Type Ⅱ: 5min/piece for large-size joints, 3min/piece for small and medium-size joints (taking into account the precision processing and efficiency of large-size joints).
Through automated loading and unloading, pre-storage of cutting parameters, self-diagnosis of faults and other functions, the machine reduces non-processing time and realizes the balance of “high precision + high beat rate”.
