Mass processing cycle = processing waiting time + workpiece processing time + production preparation time. "Processing waiting time" mainly includes the time for workpiece clamping and tool change. The "workpiece clamping time" of traditional manual machine tool fixtures can reach 10~30% of the batch processing cycle. In this way, "workpiece clamping" has become a key factor affecting production efficiency, and is also the key goal of "tapping the potential" of machine tool fixtures.
Therefore, special fixtures for quick positioning and quick clamping (unclamping) should be used during mass processing. The following three types of machine tool fixtures can be given priority:
Hydraulic/pneumatic clamps
Hydraulic/pneumatic clamps are special clamps that use oil pressure or pneumatic pressure as the power source to position, support and compress the workpiece through hydraulic or pneumatic components. Hydraulic/pneumatic clamps can accurately and quickly determine the mutual positions of workpieces, machine tools, and tools. The position accuracy of the workpiece is guaranteed by the fixture, and the processing accuracy is high; the positioning and clamping process is fast, which greatly saves the clamping and loosening of the workpiece. time; at the same time, it has the advantages of compact structure, multi-station clamping, high-speed heavy cutting, automatic control, etc.
The above advantages of hydraulic/pneumatic clamps make them particularly suitable for CNC machine tools, machining centers, flexible production lines, especially large-volume processing.
Electric permanent magnet clamp
The electro-permanent magnet clamp has the advantages of fast clamping, easy to realize multi-station clamping, multi-faceted processing in one clamping, stable and reliable clamping, energy saving and environmental protection, automatic control, etc. Compared with traditional machine tool fixtures, electro-permanent magnet fixtures can greatly shorten the clamping time, reduce the number of clamping times, and improve clamping efficiency. Therefore, it is not only suitable for small batch production, but also suitable for large batch production.
Smooth clamp base
Smooth clamp bases are not widely used in China, but are widely used in industrialized countries such as Europe and the United States. In fact, it is the finished blank after finishing the fixture base. The positioning connection part between the part and the machine tool and the positioning surface of the part on the fixture have been completed. Users can make their own special fixtures according to their actual needs.
The smooth fixture base can effectively shorten the manufacturing cycle of special fixtures and reduce production preparation time, thereby shortening the overall mass production cycle and improving production efficiency; at the same time, it can reduce the manufacturing cost of special fixtures. The smooth fixture base is therefore particularly suitable for high-volume production with tight cycle times.
