Low-speed wire cutting machine cutting accuracy is increasing

Low-speed wire cutting is the use of continuous moving thin wire (called electrode wire) as the electrode, the workpiece pulsed spark discharge metal removal, cutting molding. It is mainly used to process a variety of complex shapes and precision small workpieces, according to the different speed of wire electrode, EDM wire-cutting machine tools are generally divided into two categories: one is the slow walking wire (also known as low-speed walking wire EDM Machine tool) electrode wire for low-speed one-way movement, the general wire speed is less than 0.2m / s, accuracy of 0.001mm level, the surface quality is close to the level of grinding.

Low-speed wire cutting machine cutting precision is increasingly improved (1) Multiple cutting technology Multiple cutting technology is the basic means to improve the machining accuracy and surface quality of low-speed wire-cut WEDM. It is the scientific integration of design and manufacturing technology, numerical control technology, intelligent technology, pulsed power technology, precision transmission and control technology. Generally, it is formed by one cut, and the secondary cutting improves the precision, and the cutting more than three times improves the surface quality. In order to achieve a high-quality surface, the number of times of multiple cuttings needs to be as high as 7 to 9 times, and now it takes only 3 to 4 times.

(2) The corner processing technology is constantly optimized and perfected. Due to the lag of the electrode wire when cutting corners, the corners may collapse. In order to improve the accuracy of corner cutting, researchers have adopted more dynamic corner processing strategies. Such as: change the wire path; change the processing speed (sheet); automatically adjust the water pressure; control of processing energy. By adopting a comprehensive corner control strategy, the corner shape error during roughing is reduced by 70%, and the matching accuracy of up to 5 turns can be cut at a time.

(3) Technology to Improve Straightness High-precision finishing loops are techniques for improving flatness and are considered to be of great importance for thick parts.

(4) The machine tool structure is more precise In order to ensure high-precision machining, a number of technical measures have been adopted to improve the accuracy of the host: 1 Control the temperature. The use of a water temperature cooling device makes the internal temperature of the machine tool the same as the water temperature, reducing the thermal deformation of the machine tool. 2 uses a linear motor. High degree of response, precision positioning can achieve 0.1μm equivalent control, feed without vibration, no noise, increase the discharge frequency, maintain stable discharge, twice cutting Ry5μm. 3 The use of ceramic, polymer artificial granite parts, the thermal inertia 25 times greater than cast iron, reducing the impact of temperature changes on the cutting accuracy. 4 It adopts a fixed table and column moving structure to improve the load-bearing of the table and is not affected by the submergence processing and the change of the workpiece weight. 5 Use immersion processing to reduce the thermal deformation of the workpiece. 6 motor servo, closed loop wire tension control. 7 High-precision tool setting: Use a voltage modulation tool supply. The accuracy of the knife can reach ±0.005mm without damaging the workpiece, dry or wet.

(5) Filament cutting In order to perform micro-finishing of small rounded corners, narrow slits, narrow grooves, and fine parts, various manufacturing companies are making great efforts to conduct filament cutting technology research. At present, the world's leading manufacturers of electrical processing machines can use 0.02 ~ 0.03mm wire electrode for cutting.