Part size: 268.88*130.13*30.99mm
Part raw material: ABS NH30
Shrinkage rate: 1.0045
Part weight: 10.73 grams
Mold steel: 413
Mold base: CI5060
Mold cavity: 2
Gate system: side gate
Ejector system: slider+thimble plate
The design of plastic refrigerator shelf mold
The maximum size of the product is 268.88 mm * 130.13 mm * 30.99 mm, the average thickness of the plastic part is 2.20 mm, the plastic part material is ABS NH30, the shrinkage rate is 1.0045, the weight of the plastic part is 10.73 grams. Technical requirements for plastic parts are that there must be no defects such as peaks, insufficient injection molding, flow lines, pores, warpage deformation, silver streaks, cold materials, jet lines, etc.
According to the installation position of the plastic part at work, the plastic part needs to be tilted, so a cavity is a layout as 2 cavities. The mold base is a CI5060 standard mold base. In order to improve the positioning accuracy of front and rear mold cores, 6 zero-degree positioning blocks are designed on the edge of the mold base. Four corners of the mold core are designed with zero-degree positioning blocks to facilitate accurate clamping of front and rear mold cores. Both front and rear mold cores are positioned by squeezing blocks, which is convenient for the mold core to be framed.
Mold alignment takes into account the tilting characteristics of plastic parts and uses symmetrical alignment to balance forces. Considering the strength of mold, front and rear mold cores are equally divided into two pieces. Processing of parting surfaces is very critical. For inclined parting surfaces, high-speed CNC processing is required to avoid defects caused by manual trimming.
Due to the special shape of the plastic part, the plastic part occupies a small space on both sides of the mold, and the clamping force is not balanced during injection molding. In order to solve this problem, two balance weights were designed on the top and bottom sides of the mold. A balance weight is designed on the left and right sides. Balance weight needs to be heat-treated, quenched, and ground flat, fixed on the edge of movable and fixed mold embryo with flat screws.
According to the long length of the plastic part, the gate is designed in the center of the plastic part. Gate is a side gate.
7 buckles on the edge of the plastic part are all designed with small sliders. All slides are driven by T-slots. Under normal circumstances, use inclined guideposts to drive the slider as much as possible. Sometimes, when space is limited, a T-slot drive can also be designed to replace an inclined guidepost.
In order to prevent plastic parts from deforming, front and back molds of mold need to be designed for cooling and water transport. Distance between cooling water and plastic parts is 14.5, evenly arranged to reduce deformation of plastic parts.
The ejector of the plastic part is ejected by a thimble, and the thimble plate is guided by center tors.