The electric fan mold is mainly composed of a pouring system, a temperature control system, molded parts and structural parts. Among them, the pouring system and molded parts are the parts that are in direct contact with plastics and change with the plastics and products. They are the most complex and changing parts of the mold and require the highest processing smoothness and precision.
The electric fan injection mold consists of two parts: a movable mold and a fixed mold. The movable mold is installed on the movable template of the injection molding machine, and the fixed mold is installed on the fixed template of the injection molding machine. During injection molding, the movable mold and the fixed mold are closed to form the pouring system and cavity. When the mold is opened, the movable mold and the fixed mold are separated to facilitate removal of plastic products. In order to reduce the heavy workload of mold design and manufacturing, most injection molds use standard mold bases.
1.Gouring system
The gating system refers to the runner part before the plastic enters the cavity from the nozzle, including the main channel, cold material cavity, runner and gate, etc.
The pouring system is also called the runner system. It is a set of feed channels that guide the plastic melt from the injection machine nozzle to the mold cavity. It usually consists of a main channel, a runner, a gate and a cold material cavity. It is directly related to the molding quality and production efficiency of plastic products.
2. Main channel
It is a passage in the mold that connects the nozzle of the injection molding machine to the runner or cavity. The top of the main flow channel is concave to connect with the nozzle. The diameter of the main channel inlet should be slightly larger than the diameter of the nozzle (0.8mm) to avoid overflow and to prevent the two from being blocked due to inaccurate connection. The inlet diameter depends on the size of the product, generally 4-8mm. The main channel diameter should be expanded inward at an angle of 3° to 5° to facilitate the demoulding of the runner excess.
3. Cold material hole
It is a cavity located at the end of the main flow channel to capture the cold material generated between two injections at the end of the nozzle to prevent clogging of the runner or gate. If cold material is mixed into the mold cavity, internal stress will easily occur in the manufactured product. The diameter of the cold material cavity is about 8-10mm and the depth is 6mm. In order to facilitate demoulding, the bottom is often borne by a demoulding rod. The top of the demoulding rod should be designed in a zigzag hook shape or have a sunken groove so that the main channel debris can be pulled out smoothly during demoulding.
4. Diverter
It is the channel connecting the main channel and each cavity in the multi-slot mold. In order for the molten material to fill each cavity at a constant speed, the runner arrangement on the mold should be symmetrical and equidistantly distributed. The shape and size of the runner cross section have an impact on the flow of plastic melt, product demoulding and the ease of mold manufacturing.
5. Gate
It is the channel that connects the main channel (or runner) and the cavity. The cross-sectional area of the channel can be equal to the main channel (or branch channel), but it is usually reduced. So it is the part with the smallest cross-sectional area in the entire flow channel system. The shape and size of the gate have a great influence on the quality of the product.
The gate size should be designed taking into account the properties of the plastic melt. The cavity is the space in the mold where plastic products are formed. The components used to form the cavity are collectively called molded parts.
Individual molded parts often have special names. The molded parts that make up the outer shape of the product are called concave molds, and the molded parts that make up the internal shape of the product (such as holes, grooves, etc.) are called cores or punches. When designing molded parts, the overall structure of the cavity must first be determined based on the properties of the plastic, the geometry of the product, dimensional tolerances and usage requirements.
The second step is to select the location of the parting surface, gates and vents as well as the demoulding method according to the determined structure.
Finally, the parts are designed according to the size of the control product and the combination of the parts is determined. The plastic melt has high pressure when entering the cavity, so the molded parts must be reasonably selected and their strength and stiffness checked.
6. Temperature adjustment system
In order to meet the requirements of the injection process on the temperature of the electric fan mold, a temperature adjustment system is required to adjust the temperature of the mold. For injection molds used for thermoplastic plastics, the cooling system is mainly designed to cool the mold.
The common way to cool the mold with an electric fan is to open a cooling water channel in the mold, and use the circulating cooling water to take away the heat of the mold. In addition to using hot water or steam in the cooling water channel, the heating of the mold can also be done in and around the mold. Install electric heating elements.
7. Molded parts
It refers to the various parts that make up the shape of the product, including the movable mold, the fixed mold and the cavity, the core, the forming rod and the exhaust port. The molded part consists of a core and a die. The core forms the inner surface of the product, and the die forms the outer surface shape of the product. After the mold is closed, the core and cavity form the cavity of the mold.
According to process and manufacturing requirements, sometimes the core and die are combined from several pieces, sometimes they are made as a whole, and inserts are only used in parts that are easily damaged and difficult to process.
8.Exhaust port
It is a groove-shaped air outlet opened in the mold to discharge the original gas and the gas brought in by the melt. When the molten material is injected into the mold cavity, the air originally existing in the mold cavity and the gas brought in by the melt must be discharged out of the mold through the exhaust port at the end of the material flow. Otherwise, the product will have pores, poor connections, and The mold filling is not satisfactory, and the accumulated air may even burn the product due to high temperature caused by compression.
9. Structural parts
It refers to the various parts that make up the mold structure, including: guide, demoulding, core pulling and parting parts. Such as front and rear plywood, front and rear buckle templates, pressure-bearing plates, pressure-bearing columns, guide columns, stripping plates, stripping rods and return rods, etc.
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Post time: Apr-11-2024