The main channel is a section of ch

The main channel is a section of channel connecting the nozzle and the runner of the injection molding machine. It is usually on the same axis as the nozzle of the injection molding machine. The section is round with a certain taper1) The main channel is designed as a cone, the cone angle is 1°~6°, and the roughness is 0.4um2) The large end of the main channel is rounded with a radius of r = 1 ~ 3mm to reduce the resistance when the material is over-rotated3) If the mold structure allows, the gate should be as short as possible, generally less than 100mm. If the time is too long, it will affect the smooth filling of the fluid4) For small molds, the gate bushing and the positioning ring can be designed as a whole, but in most cases, the gate bushing and the positioning ring are designed as two parts. The gate bushing and the positioning plate adopt H7 / M6 oversized fit, and the positioning ring adopts H9 / F9 clearance fitAccording to the working conditions of the system, we determined that the matching tolerance of the mold and the gate sleeve is H9 / F9. The positioning ring should be inserted into the positioning hole of the fixed template of the injection molding machine for the installation and positioning of the mold and the injection molding machine. The outer diameter of the positioning ring is less than 0.2mm of the positioning aperture on the fixed template of the injection machine. The matching degree between the gate sleeve and the template is H7 / M6