The determination of the gate form of the spotlight rear cover mold is a process of comprehensive consideration of many factors.
First, the appearance requirements of the product play a key role. The spotlight rear cover is usually an important appearance component of the lamp. If the appearance quality requirements are extremely high, such as the surface needs to be highly smooth, without defects and weld marks, the point gate is a better choice. The point gate leaves a small mark on the surface of the product. Through reasonable mold design and subsequent processing, the surface quality of the rear cover can reach a higher standard. For example, some high-end spotlight rear covers, in order to create a delicate appearance, use a point gate to hide the gate marks in an inconspicuous position or facilitate subsequent processing and removal.
Secondly, the size and shape of the product will also affect the choice of gate form. For larger spotlight rear covers, side gates may be more suitable. Because the side gate can be set at a longer edge position, the plastic melt can fill the entire cavity more evenly. For rear covers with complex shapes and multiple thin-walled parts, it is more advantageous to use fan-shaped gates. The fan gate allows the melt to enter the cavity smoothly in a wider area, avoiding excessive local pressure caused by excessive melt flow rate, thereby preventing the thin-walled part from being punched through or obvious flow marks.
The fluidity of the plastic is also an important factor in determining the gate form. If the plastic material used in the spotlight rear cover has poor fluidity, such as some engineering plastics with a lot of fillers, direct gate may be a consideration. The direct gate has a large cross-sectional area and can provide greater pressure for the melt, which helps to push the plastic with poor fluidity to fill the mold cavity.
The structural complexity of the mold also needs to be considered. From the perspective of mold manufacturing and processing convenience, side gates and direct gates are relatively simple, have little impact on the overall structure of the mold, and have low processing costs. The pin-point gate requires a special three-plate mold structure, and the mold cost and processing difficulty are relatively high, but it has irreplaceable advantages in meeting specific product requirements. Combining the above factors, after repeated weighing and simulation analysis, the most suitable gate form for the Spotlight rear cover mold can be determined.
