Design of gas assisted injection mold construction for left and right window frame trim panels of automobile tailgate

doi:10.19491/j.issn.1001-9278.2023.11.016

Abstract

Abstract:

According to the structural characteristics and molding requirements of the left and right window frame trim panels of an automobile tailgate， a pair of “one mold and two cavities” hot runner gas⁃assisted injection mold with a sequence valve control was designed. After the gating system was designed， the rationality of the gating system was verified by the CAE mold flow analysis， and the possible problems in the molding process were predicted. The lateral holes， inverted buckles， stiffeners， inverted buckles on the inner surface and concave features of the tail in the lateral area of plastic parts were more difficult for demolding. In this case， the demolding mechanism of “oblique guide column+slider” was designed for 4 side holes and 1 inverted feature in the lateral area. According to the characteristics of lateral stiffeners， the release mechanism of “hydraulic cylinder+large slider” was designed. The release mechanism of “oblique guide column slider” was also designed according to the concave feature of the tail. Meanwhile， the release mechanism of "inclined top block+inclined top bar" was designed according to the four inverted features on the inner surface. The ejection system was designed to use an ejection cylinder to provide the release force， and drives the combination of "ejector pin+straight ejector rod+straight top block" to participate in ejection. After actual production verification， the result indicated that the mold structure design was reasonable， the working process was stable and reliable， and the products could meet the design requirements.

Key words: left and right window frame decorative panels, gas assisted injection molding, model flow analysis, hot runner of sequence valve, lateral core pulling mechanism, ejection mechanism

CLC Number:

TQ320.66⁺2

ZHOU Jiwei, WANG Mingwei, WU Di, ZHANG Wenchao, LIN Lianming, YU Junwei. Design of gas assisted injection mold construction for left and right window frame trim panels of automobile tailgate[J]. China Plastics, 2023, 37(11): 141-148.

Figures/Tables 13

Fig.1. Assembly drawing of automobile tailgate trim panel

Fig.2. Part drawings of left and right window frame trim panels

Fig.3. Design of mold pouring system

Fig.4. Grid division

Fig.5. Results of CAE analysis

Fig.6. Design of gas injection system and overflow tank

Fig.7. Design of formed parts

Fig.8. Design of lateral core pulling mechanism

Fig.9. Design of ejection mechanism

Fig.10. Design of cooling system

Fig.11. Mold assembly drawing

Fig.12. Mold for left and right window frame trim panels of car tailgates

Fig.13. Actual mold trial results

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