The total station movement support product is shown in Figure 1. The maximum size of the product is 121.13 mm x 53.10 mm x 32.15 mm, the average thickness of the plastic part is 1.50 mm, the material of the plastic part is ABS, the shrinkage rate is 1.005, and the quality of the plastic part is 13.28 Grams. The technical requirements for plastic parts are that there must be no defects such as peaks, dissatisfaction with injection molding, flow lines, pores, warpage deformation, silver lines, cold materials, jet lines, etc.
The plastic part structure is shaped as a special-shaped bracket shell, and the plastic part structure and 3D mold design drawing are shown in the attached 3D drawing. The plastic part is close to a closed U-shape, with a protrusion on the closed end and a small hole on it. Here, the slider core needs to be designed. There is a vertical wall on the two sides of the plastic part with several small holes, and it is also necessary to design the slider core.
The inside of the plastic part is smooth and flat. Except for the closed end, the rest has no bone positions. The clamping force for the mold is limited to 3 side edges. There are many bone positions and columns on the top surface of the outer side of the plastic part, which has a relatively large tightening force for the mold. Therefore, when designing the mold, it is necessary to determine the direction of mold opening according to the packing force of the plastic part. After the mold opening direction is determined, the correct parting surface can be designed.
In view of the actual situation of the plastic part, when designing the mold, it is necessary to use the inside of the plastic part as a fixed mold and the outer top surface as a movable mold, so as to ensure that the plastic part does not stick to the fixed mold when the mold is opened. The mold design drawing is shown in Figure 2.
The structure of the plastic part is more complicated. The mold design cavity ranks 1 out 1. The holes on the vertical side of the side and the holes on the end surface are combined to design a large slider, and the other side is designed with a slider. Two sliders are used to solve the problem. Core pulling problem. Both sliders are driven by oblique guide posts. Due to the limited space position, the small slider adopts single-sided bead guide. The large sliding block on the end face has a great expansion force, and the inclined wedge is designed to go deep into the movable mold backhoe. The mold base is the standard mold base FCI2330, and the gating system uses a fine nozzle to turn a side gate to feed glue from one side of the plastic part.
The mold cooling system is designed with two straight-line, straight-through water-carrying designs for both movable and fixed molds. The flow of through water is large and the cooling efficiency is the highest. Design the through water as much as possible.
All plastic parts are ejected by a thimble. All thimble holes are cut out by wire cutting. Exhaust holes need to be ground on the circumference of the thimble. When matching the thimble, it should be noted that after the thimble is installed, it needs to be twisted to be able to rotate flexibly. Only in this way can it have a long life in the subsequent production. In higher temperature molds, SKD61 heat-resistant thimble is used, and the surface of titanium plating can delay its surface wear. It is also possible to use SKH51 high-speed steel thimble when the conditions are available, with a longer life.
ABIS MOLD TECHNOLOGY CO.,LTD
Daisy Wang (Sales Engineering)
M: +86-150 1652 6799
E: daisy@abismold.com
A: Building B#,YingKeli Industrial Part, LongDong Community, LongGang District, Shenzhen, China 518116
WhatsApp: +86 136 8261 9739
Skype: daisymold@outlook.com