Taking aluminum extrusion multi-hole dies as an example, the bar temperature control range for multi-hole flat dies is generally between 390-480°C, specifically using a stepped cooling method. The bar temperature control range for multi-hole diverter dies is generally between 430-500°C. Typically, the die temperature should be controlled between 430-480°C, the ingot container temperature between 410-440°C, and the discharge port temperature between 520-580°C.
The die heating time is generally controlled within 6 hours to ensure through-extrusion. The time from removing the die from the furnace to extruding the material should not exceed 3 minutes. During the extrusion process, the first bar should not be vented, and a short bar should be used for extrusion, with a bar length controlled at 200-300mm. The first bar should start with a "0" setting, and the extrusion speed should be gradually increased after extrusion, with the extrusion speed controlled at 30-40m/min. During production, quenching must be performed strictly according to alloy condition requirements, using either air cooling or water cooling. Unauthorized machine shutdowns are not permitted during normal production. If a shutdown occurs due to equipment malfunction and exceeds 3 minutes, the mold must be removed and returned to the furnace for reheating. The normal temperature control range for the extrusion section is 520-580°C.
Aluminum rod heating is generally controlled from high to low. When placing the mold in the mold furnace for heating, the mold should not be close to the furnace wall or the fan vent; it should be placed as centrally as possible. Sufficient clearance must be maintained between molds, generally no less than 5 cm. The mold furnace must be kept clean and dust-free. During multi-hole mold production, the operator must constantly monitor the rod temperature, extrusion section temperature, profile surface, and equipment operation. Successfully implementing the "one mold, multiple holes" technology requires attention to the stability of the extrusion press and the quality of the mold, along with advanced supporting equipment such as a machine with a double-traction machine and flying saw, molds, an aluminum rod heating furnace, and long ingot furnace hot shearing technology.
In the field of rubber injection vulcanization, cold runner molds are increasingly used in the production process of injection vulcanized rubber products because they save material, significantly reduce material waste, and improve product quality. Among these, the design of the cold runner is crucial to the overall vulcanization mold design. How to maximize the design of the mold cavity and improve efficiency is a key question. A pseudoplastic fluid model is used to discuss and verify the feasibility of multi-hole molds.
