1. What is the purpose of inserting an insert into a plastic part?
The purpose of inserting inserts into plastic parts is to improve the local strength, hardness, wear resistance, conductivity, magnetic conductivity, etc. of the plastic parts, or to increase the stability of the size and shape of the plastic parts, or to reduce the consumption of plastic.
2. What is the working principle of the single parting injection mold?
The single parting surface injection mold is also called the two plate injection mold, as shown in Figure 5.4. When closing the mold, the moving mold and the fixed mold are closed under the guidance and positioning of the guide pillar 8 and the guide sleeve 9. The cavity is composed of the cavity on the fixed template 2 and the core 7 fixed on the movable template 1, and is locked by the clamping force provided by the mold closing system of the injection machine. Then the injection machine starts to inject, the plastic melt enters the cavity through the gating system on the fixed mold, the cavity is filled with the melt, and the mold is opened after pressure holding, plastic filling and cooling. When opening the mold, the mold closing system of the injection machine drives the moving mold to retreat, the driven mold of the mold is separated from the parting surface of the fixed mold, the plastic part is wrapped on the core 7 and retreats with the moving mold, at the same time, the pulling rod 15 pulls out the main runner condensate of the gating system from the gate sleeve. When the moving die moves for a certain distance, the ejector pin 21 of the injection machine contacts the push plate 13, and the push plate mechanism starts to operate, so that the push rod 18 and the pull rod 15 push the plastic part and the pouring system condensate from the core 7 and the cold feed cavity respectively, and the plastic part and the pouring system condensate fall down from the mold together, thus completing an injection process. When closing the mold, push out the mechanism against the reset lever and prepare for the next injection.
3. How is the single parting injection mold composed?
According to the composition of the mechanism, the single parting injection mold as shown in Figure 5.3 can be divided into mold cavity, molding parts, gating system, guide mechanism, ejection device, temperature regulation system and structural parts
4. How is the cavity of the single parting injection mold composed?
The cavity part of the mold used to form plastic parts. Since the mold cavity is the part that directly forms plastic parts, the shape of the mold cavity should be consistent with the shape of the plastic parts. The mold cavity is generally composed of a cavity and a core. This figure is composed of cavity 2, core 7, fixed template 1 and push rod 18.
5. How are the components of single parting injection mold formed?
The parts that constitute the cavity of a plastic mold are collectively called molding parts, which usually include the core (internal shape of the molding plastic part) and cavity (external shape of the molding plastic part). This drawing is composed of fixed template 2, core 7 and movable template 1.
6. How is the gating system of single parting injection mold composed?
The runner that leads the plastic from the injector nozzle to the mold cavity is called the gating system. The gating system is divided into four parts: main runner, splitter, gate and cold feed cavity. It is composed of runner sleeve 6, pull rod and runner on the fixed template 2.
7. How is the guiding mechanism of the injection mold with a single parting surface composed?
The guide parts are set to ensure the accurate alignment of the moving mold and the fixed mold during the mold closing. Usually, there are guide columns, guide holes or internal and external conical surfaces that are mutually matched are set on the movable and fixed molds. This legend is composed of guide post 8 and guide sleeve 9.
8. How is the ejector of the single parting injection mold composed?
A device that pushes a plastic part out of a mold during mold opening. In order to avoid the deflection of the ejection plate during ejection, some ejection devices of injection molds are also equipped with guide parts to keep the ejection plate moving horizontally. It is composed of a push rod 18, a push plate 13, a push rod fixing plate 14, a reset rod 19, a main channel pull rod 15, a support pin 12, a push plate guide post 16 and a push plate guide sleeve 17.
9. How is the temperature regulation and exhaust system of the single parting injection mold composed?
In order to meet the requirements of the injection process on the mold temperature, the mold is equipped with a cooling or heating system. The cooling system is generally equipped with cooling channels in the mold, and heating elements, such as electric heating elements, are installed inside or around the mold for heating. This drawing is composed of cooling water channel 3 and water nozzle.
In the injection molding process, in order to exclude the gas in the cavity from the mold, it is often necessary to set up an exhaust system.
10. How are the structural components of the single parting surface injection mold composed?
It is used to install and fix or support the formed parts and components and the aforementioned parts and mechanisms. The support components can be assembled together to form the basic skeleton of the injection mold. This drawing is composed of fixed mold base plate 4, movable mold base plate 10, cushion block 20 and support plate 11.