Hot runner technology has become an important field of plastic injection moulding technology with its unique technical advantages such as cost saving and shortening moulding cycle.
Benefits of hot runner technology compared with conventional cold runner:
- Save raw materials and reduce costs.
- Shorten the forming cycle and improve the efficiency of the machine.
- Improve the surface quality and mechanical properties of products.
- Point gate can be used without using three-plate die.
- The single product can be economically moulded by side gate.
- Improve the degree of automation;
- Needle valve gate can be used to control the freezing of the gate.
- The quality of injection parts of multi-cavity mould is the same.
- Improve the surface aesthetics of injection moulded products.
The installation of the hot runner is directly related to the quality of the product.
The following points for attention in the installation of the hot runner are as follows:
- Set up the mould, flatten the upper die, and clean all the holes and templates with the air gun.
- Check the hole size, focus on the depth, remove the burrs on the template. At the same time, check whether the screw holes of the lock shunt plate and the center nail and the anti-dumping pin holes have been processed or not. The master who made the hot runner mould for the first time in this place often missed it.
- Scavenge red pills at the sealant position of the hot nozzle and the upper step position which cooperate with the mould.
- Trial-assemble the hot nozzle, and then remove it to check whether the sealing glue level rubs red and whether the step position touches the mould. If not, stop the installation, check the cause of the error and adjust it to ensure tight cooperation and no leakage. Be careful not to touch the tip of the mouth during this process.
- Install all the hot nozzles, and install the central pad, the central pin and the anti-reselling, and sweep red red potatoes on the surface of the hot nozzles.
- Check the level of the nozzle and the height of the central cushion, and the error is within 0.05 mm.
- Trial installation of shunt plate. Attention should be paid to not missing the hot-nozzle sealing ring when formally installing the shunt plate.
- Check the cooperation between the shunt plate and the hot nozzle to ensure that all of them meet Hongdan and do not leak glue.
- Clean up the hot-tip wiring, make it neat and beautiful, and number each group of lines in sequence, and connect the lines into acne insertion.
- Load the shunt plate formally, lock the fixed screw of the shunt plate (pay attention to the balance, keep the four corners of the shunt plate in the same height), control the meson of the shunt plate is 0.10-0.15mm higher than the surrounding die frame plane, and then sweep red red red on the shunt plate meson.
- Trial-install the code template, check whether the plane meets the meson red, and ensure that the template suppresses the splitter plate meson.
- Lock the die and stand it up. Check whether the match between the gate and the tip meets the requirements from the parting surface. To make the tip less than 0.1-0.2 mm of gate surface, the tip should not be eccentric. Carefully detect each group of circuits with multimeter, so that there is no short circuit, circuit break, leakage, and so on. Each group of lines corresponds correctly to ensure that all circuits are normal.
- Connect the thermostat for trial heating, the first heating should be within 100 C, keep 10 minutes for pre-heating and dehumidification, protect the heater; then, warm up to the required temperature, if normal, you can arrange the lifting die test.