Die casting system and the composing of the role
2015-03-24 9:26:13
Abstract: the gating system generally consists of four parts the sprue, runner, gate, cold material, the following part. The mainstream Road, from the nozzle and mold injection machine contact play a runner until the stream channel, will be responsible for the plastic melt from the nozzle into the mold.
The gating system generally consists of four parts the sprue, runner, gate, cold material, the following part.
The mainstream Road, from the nozzle and mold injection machine contact play a runner until the stream channel, will be responsible for the plastic melt from the nozzle into the mold.
The shunt between the sprue gate, and the stream channel, transition of plastics melt from the main channel to flow into the die cavity, will be responsible for the melt flow smooth conversion, multimode cavity also plays will melt into each die cavity distribution function.
The runner and gate, between the cavity length is very short, section and very narrow section of the stream channel, the main role is as follows.
For the narrow gate section, so after the shunt, plastic melt temperature and pressure have declined from acceleration and larger shear heat flow, which has faster speed and better melt flow of mould filling.
Second, because of its short length, sectional stenosis, plastic melt volume so the gate can accommodate very small, so it's easy to solidification (commonly known as the gate freeze), which helps to prevent backflow phenomenon of keeping pressure is insufficient or holding time is too short and cause.
The cross section of plastic melt in the gate is narrow, so the internal cooling curing (waste) very low intensity, very easy to break, so easy to product and waste separation, and ease of demolding.
The gate length and cross section size in general can be found in the appropriate adjustment in the process of trial mode. Especially to adjust its section dimension, the change of height of section volume and gate to gate freezing time of great influence; in addition, changes in cross-sectional area of the plastic melt in the shear strain rate effect is very big, and the shear rate and melt apparent viscosity related, so changing the gate section size or cut the size of the area, you can control the gate freezing time (i.e. feeding time or feeding level), and the melt flow properties at the time of filling.
The cold material, cold material general opened in the mainstream Road end, when the shunt is longer, the end can also set up a cold material. Cold material is the role of the cold head of melt flowing front collect each injection molding (forward the cold material), avoid these cold material into the mould cavity effect of the molding product quality, or prevent these cold material blockage caused by lack of material gate products. If you need to prevent the mold cavity with different directions due to cold material melt confluence and the influence of weld line strength, can also be cold material nearby opened in the mold cavity melt confluent place, and communicated with the mould cavity.
The gating system generally consists of four parts the sprue, runner, gate, cold material, the following part.
The mainstream Road, from the nozzle and mold injection machine contact play a runner until the stream channel, will be responsible for the plastic melt from the nozzle into the mold.
The shunt between the sprue gate, and the stream channel, transition of plastics melt from the main channel to flow into the die cavity, will be responsible for the melt flow smooth conversion, multimode cavity also plays will melt into each die cavity distribution function.
The runner and gate, between the cavity length is very short, section and very narrow section of the stream channel, the main role is as follows.
For the narrow gate section, so after the shunt, plastic melt temperature and pressure have declined from acceleration and larger shear heat flow, which has faster speed and better melt flow of mould filling.
Second, because of its short length, sectional stenosis, plastic melt volume so the gate can accommodate very small, so it's easy to solidification (commonly known as the gate freeze), which helps to prevent backflow phenomenon of keeping pressure is insufficient or holding time is too short and cause.
The cross section of plastic melt in the gate is narrow, so the internal cooling curing (waste) very low intensity, very easy to break, so easy to product and waste separation, and ease of demolding.
The gate length and cross section size in general can be found in the appropriate adjustment in the process of trial mode. Especially to adjust its section dimension, the change of height of section volume and gate to gate freezing time of great influence; in addition, changes in cross-sectional area of the plastic melt in the shear strain rate effect is very big, and the shear rate and melt apparent viscosity related, so changing the gate section size or cut the size of the area, you can control the gate freezing time (i.e. feeding time or feeding level), and the melt flow properties at the time of filling.
The cold material, cold material general opened in the mainstream Road end, when the shunt is longer, the end can also set up a cold material. Cold material is the role of the cold head of melt flowing front collect each injection molding (forward the cold material), avoid these cold material into the mould cavity effect of the molding product quality, or prevent these cold material blockage caused by lack of material gate products. If you need to prevent the mold cavity with different directions due to cold material melt confluence and the influence of weld line strength, can also be cold material nearby opened in the mold cavity melt confluent place, and communicated with the mould cavity.
