In order to pursue the high productivity of mechanical manufacturing, it promotes the development of Precision Cnc Turning to process compounding (process compounding and process compounding), high speed, intelligence, network, and process parameter optimization.
Rapid Prototype Tooling composite processing mainly refers to process concentration, compounding and process compounding.
1. Process concentration and compounding
Since the end of the 1970s, as the triple-link machining center began to be used in machinery manufacturing, it has entered the era of centralized machining processes. In the 1980s, China’s self-made three-link machining center also began to be used in machinery manufacturing, mainly for box parts and mold processing. In one installation, multiple processes such as boring, Precision Cnc Milling, drilling, tapping, etc. can be realized, which improves processing efficiency and precision.
2000-2011 is the fastest period for the development of CNC machine tools in China. During this period, the company independently developed a five-axis linkage machining center, a turning, and milling composite machining center, a turning and milling combined machining center, and a grinding compound machining center. Some domestic manufacturers have been able to provide five-axis linkage and multi-axis linkage composite machining centers, but some are major special projects, which are subject to further commercialization and industrialization.
2. Five-axis linkage machining center
The number of domestically produced five-axis linkage machining centers is increasing. Such as the GMC2590μ bridge five-axis linkage machining center produced by Shenyang Machine Tool (000410), VM22120μ vertical five-axis machining center, VMC05656e gate five-axis machining center, HS664RT five-axis high-speed machining center; VDM500 five-axis vertical generation produced by Dalian machine tool Machining Center; XKR32G 5-axis linkage machining center and XKH800 5-axis linkage blade machining center produced by Beijing Electromechanical Institute; XV2525×60 overhead 5-axis linkage machining center produced by Jinan No. 2 Machine Tool can realize milling and boring of one-time installation parts , drilling, reaming, tapping and other processes.
It is technically difficult to develop two key core components in a five-axis linkage machining center. One is a double-angle universal machining head; the other is a two-axis rotary table (see Figure 2). Domestic manufacturers of these two components have also been developed, but they need further improvement and commercialization.
The double swing angle universal machining head is used for large machine tools, and the double swing shaft rotary table is used for small machine tools. Currently, these two components use direct drive torque motors and are equipped with encoders to improve dynamic performance and accuracy.
The double swing angle universal machining head is more technically difficult. The main parameters of a direct drive double swing angle universal head developed by a domestic manufacturer are as follows:
The amount of torque: A-axis 500 – 1000Nm (optional), C-axis 660 – 2000Nm (optional);
Positioning accuracy: ±2″, ±2.5″, ±3″, ±5″ (optional);
Absolute encoder resolution: 26 bits, 29 bits (optional);
The swing angle range is ±110° for the A-axis and ±360° for the C-axis.
China has not yet formed a series of products with double swing angles, but internationally, like CYTEC in Germany, it can supply serialized products.