Design essentials of injection mould for honeycomb drawer
The honeycomb drawer product is shown in Figure 1. The maximum size of the product is 120.00 mm x 88.50 mm x 32.20 mm, the average thickness of the plastic part is 3.00 mm, the material of the plastic part is PC+ABS+PTFE, the shrinkage rate is 1.0045, and the quality of the plastic part is 55.64 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 streaks, cold materials, jet lines, etc.
It can be seen from Figure 1 that the plastic part is shaped as a flat drawer-shaped shell. The shape of the front and rear molds is roughly symmetrical. There is an elastic tongue on one side of the plastic part, and the slider core needs to be designed here. The plastic part material is PC+ABS+PTFE, among which PC+ABS is commonly known as plastic alloy. This material not only has the excellent heat and weather resistance, dimensional stability and impact resistance of PC resin, but also has excellent processing fluidity of ABS resin. Therefore, it can be used in thin-walled and complex-shaped products to maintain its excellent performance and good injection moldability. PTFE has excellent chemical stability, and does not have any effect on concentrated acids, concentrated alkalis or strong oxidants, and even "aqua regia" even at high temperatures. The friction factor is only 0.04. It can be used as an oil-free lubricating material for offshore oil drilling derrick slide rail veneer, dock slide veneer, river dam gate slide veneer, bridge telescopic support slide veneer, various lathes , Boring machine, grinder, planer sliding guide veneer and lubricating board, and manufacturing laminate, decorative board stripping template. After adding PTFE, the coefficient of friction of the honeycomb drawer is small, the product is wear-resistant, and various electrical properties are good.
The plastic parts are produced in large batches, and the mold design cavity is ranked as 1 out of 4. See the mold design diagram 2. The glue feeding method is a three-plate mold point gate, and the gate position is on the top surface of the plastic part, and the glue is fed in one point. The parting surface selection of the mold. For this kind of plastic part, the parting surface is very simple, it is a plane, located in the center of the plastic part, and the difficulty lies in the choice of the mold opening direction. When the size and shape of the movable mold side and the fixed mold side of the plastic part are roughly the same, the choice of the mold opening direction of the plastic part is very important. The selection of the mold opening direction is related to various issues such as whether the plastic part will stick to the mold, whether the plastic part will be difficult to demold when the mold is opened.
This set of molds choose to design one side of the elastic tongue in the movable mold, there are two main factors. First, it is convenient to design the lateral parting and core pulling mechanism. The elastic tongue is on the side of the movable mold. The movable mold slider is designed, which is simple and reliable. The second factor is that due to the influence of the elastic tongue and the other two bone positions, the elastic tongue is designed on the movable mold side, and the packing force on the movable mold side is greater than the fixed mold side, and the plastic parts are not easy to stick to the fixed mold.
The mold base is DCH5080, the mold is American mold style, and the mold base adopts a straight mold base. The mold is large, the mold core is divided into two pieces, and the fine frame is also two. The sliders are located on both sides of the operating side and the non-operating side. At the same time, two inclined positioning blocks are designed on the heaven and earth side to provide secondary positioning for the mold. The mold steel is S-7, which is chromium steel used for molds in the United States. This material has a heat treatment of 54-56HRC and has better toughness than 8407 and 2344. It is a commonly used material for long-life molds.
All the sliders are driven by two oblique guide posts. The slider insert 19 is set on the slider seat 18 as a step. The design of the slider separate inserts mainly considers the ease of processing, and secondly considers the ease of designing the fixing of the water transport apron ; The inclined wedge 15 extends to the movable mold as a backhoe mechanism to ensure the reliable clamping of the slider.
Daisy Wang|Sales Engineer
Email: Daisy@abismold.com
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