Automotive Design. Car rearview mirror design(3)
2 mold structure analysis
2.5 demoulding system design
The mold is a "push rod + push block + oblique push block" structure. After the mold is opened, the mold is pushed out by the pusher to push out the plastic part and the flow path. The pusher fixed plate is pushed by the injection molding machine through the oil cylinder and in 4 pieces. Reset by the action of the reset lever. Pay attention to the following points when designing the demoulding system: 1. Large molds (more than 1400mmX700mm in length and width direction) need to design 6 reset rods and 6 push rod guide columns. All car mold reset rods should be designed with a reset rod. A large level of reply block, the reply block is generally selected 45# (S50C) nitriding treatment. The pusher plate guide post is to be placed near the push-out element with a large pushing force (such as a cylinder, a reset lever, etc.). 2. The limit column should be placed above or near the KO hole. The push rod should be arranged at the force position near R, and it should be placed in the position with large clamping force. The push rod design should be large, the push rod should be arranged more, and the design push rod should be designed as the same specification. Do not design many specifications. This can avoid frequent replacement of the drill tip, saving processing time and processing costs.
3 mold working process
The melt passes through the nozzle of the injection molding machine and enters the mold cavity through the hot nozzle 23. After the melt fills the cavity, after the pressure is maintained, cooled and solidified, after the rigidity is sufficient, the injection molding machine pulls the movable mold fixing plate 14 of the mold, and the mold is divided. The mold is opened at the profile PLI. After the mold is opened 300mm, the injection molding machine cylinder pushes the pusher fixing plate 12, the pusher fixing plate pushes the push rod 30, and then the cylinder continues to act, and continues to push out 60mm, pushing all the push pieces to push the molded plastic part away from the movable mold. After the plastic parts are taken out, the injection molding machine cylinder pulls the pusher and its fixing plate to be reset, and then the injection molding machine pushes the movable mold to close the mold, and the mold starts the next injection molding. Automotive
4 Results and discussion
It is necessary to pay attention to the design of this type of mold. This structure must be hand-picked and hand-picked. When it is necessary to take out the parts, the plastic parts are manually removed. For such plastic parts, the plastic parts must have a swinging space. This type of plastic parts that are hand-pulled out are also used in automobile mold design, such as automobile steering column and throttle cover. Automotive