Beiben H06 Car Rearview Mirror Mold
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The shell of the car rearview mirror mold is streamlined for aesthetics, with a complex shape. The other surfaces are mostly composed of curves, and there are two hollow cylindrical holes for installation and multiple reinforcing ribs in the middle.
Typically, the wall thickness of injection molded parts is required to be uniform. Uneven wall thickness can lead to internal stress, warping, shrinkage, and other defects in plastic parts. If the wall thickness is too small, the flow resistance during molding is high, making it difficult for the chaotic product to fill the cavity; if the wall thickness is too large, it not only results in excessive material usage increasing costs but also prolongs the cooling time of the plastic part. By using the "tool/thickness analysis" command, the thickness of the plastic part can be checked.
To smoothly remove the plastic part from the car rearview mirror mold cavity or to pull the core out of the plastic part, it is necessary to ensure that there is sufficient draft angle on the inner and outer walls.
The overall size of the car rearview mirror mold is medium-sized, with low dimensional accuracy, suitable for medium batch production. To reduce molding costs, this design adopts a single cavity per mold. Based on the structural analysis of the part, the parting line is selected at the maximum contour, with the upper part using an integral front mold cavity and the lower part using an integral rear mold, along with several small cores embedded. All surfaces of this plastic part are curved, and the parting line is designed at the maximum contour of the plastic part. There is a large opening on the lateral part of this plastic part, requiring a sliding core pulling mechanism, and at the two reinforcing ribs of the rear mold, there are undercuts that need to be designed as inclined top pulling mechanisms. A comprehensive analysis of the characteristics of the plastic part indicates that the key to mold design lies in the design of the core pulling mechanism.
The assembly drawing of the car rearview mirror mold shows that after the mold is closed, the injection molding machine begins to inject ABS into the cavity. After a period of holding pressure for molding, the rear mold starts to separate from the front mold with the injection molding machine. When the front mold opens to the end position, under the effect of the pull rod and the clamping force of the core, the plastic part and the flowing condensed material remain on the moving mold. At this moment, the core pulling mechanism begins to drive the lateral sliding block to complete the lateral core pulling under the effect of the hydraulic cylinder. Under the effect of the ejection mechanism, the plastic part separates from the moving mold. Under the effect of the reset rod and the reset spring, the ejector rod returns to the position where the mold was closed, and finally, the mold closes, completing one working cycle of the mold.
The shell of the car rearview mirror mold is streamlined for aesthetics, with a complex shape. The other surfaces are mostly composed of curves, and there are two hollow cylindrical holes for installation and multiple reinforcing ribs in the middle.
Typically, the wall thickness of injection molded parts is required to be uniform. Uneven wall thickness can lead to internal stress, warping, shrinkage, and other defects in plastic parts. If the wall thickness is too small, the flow resistance during molding is high, making it difficult for the chaotic product to fill the cavity; if the wall thickness is too large, it not only results in excessive material usage increasing costs but also prolongs the cooling time of the plastic part. By using the "tool/thickness analysis" command, the thickness of the plastic part can be checked.
To smoothly remove the plastic part from the car rearview mirror mold cavity or to pull the core out of the plastic part, it is necessary to ensure that there is sufficient draft angle on the inner and outer walls.
The overall size of the car rearview mirror mold is medium-sized, with low dimensional accuracy, suitable for medium batch production. To reduce molding costs, this design adopts a single cavity per mold. Based on the structural analysis of the part, the parting line is selected at the maximum contour, with the upper part using an integral front mold cavity and the lower part using an integral rear mold, along with several small cores embedded. All surfaces of this plastic part are curved, and the parting line is designed at the maximum contour of the plastic part. There is a large opening on the lateral part of this plastic part, requiring a sliding core pulling mechanism, and at the two reinforcing ribs of the rear mold, there are undercuts that need to be designed as inclined top pulling mechanisms. A comprehensive analysis of the characteristics of the plastic part indicates that the key to mold design lies in the design of the core pulling mechanism.
The assembly drawing of the car rearview mirror mold shows that after the mold is closed, the injection molding machine begins to inject ABS into the cavity. After a period of holding pressure for molding, the rear mold starts to separate from the front mold with the injection molding machine. When the front mold opens to the end position, under the effect of the pull rod and the clamping force of the core, the plastic part and the flowing condensed material remain on the moving mold. At this moment, the core pulling mechanism begins to drive the lateral sliding block to complete the lateral core pulling under the effect of the hydraulic cylinder. Under the effect of the ejection mechanism, the plastic part separates from the moving mold. Under the effect of the reset rod and the reset spring, the ejector rod returns to the position where the mold was closed, and finally, the mold closes, completing one working cycle of the mold.
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When we are processing motorcycle parts mold shells, we often encounter some problems, one of the more common ones being cracking. It is well known that the main cause of cracking is due to stress deformation, which can be mainly divided into residual stress, external stress, and stress deformation caused by the external environment. Therefore, to solve the cracking problem that occurs during the processing of plastic mold shells, we must start by addressing the stress.
High-gloss molds have very strict requirements for product structure. It is well known that the shinier the product, the more sensitive it is to light refraction effects. Any slight surface defect will be quickly noticed. Therefore, how to solve the shrinkage problem is the primary issue for high-gloss products. According to experience statistics, the thickness of the ribs in general products should not exceed 0.6 times the thickness of the main glue position to avoid shrinkage, or in other words, the shrinkage is small and not easily detected, which can be ignored. However, for high-gloss products, such requirements are far from sufficient. The thickness of the product ribs must be reduced to no more than 0.4 times the thickness of the main glue position, and special treatment must be applied to the screw column positions.