Car Fairing Injection Mould

First, the role of the mold
1. Molding accuracy
Automotive fairing usually has a complex curved shape, the purpose of which is to optimize the airflow around the car, reduce air resistance, and improve fuel efficiency. The mold precisely shapes the hood to ensure that it meets aerodynamic design requirements. For example, the camber of the edge of the hood, the streamline of the surface and other details should be accurately formed by the mold, and the error is generally controlled within a small range, usually within ±0.5mm, to ensure the performance of the hood.

2. Mass production
Mold can realize the mass production of automotive fairing. In the automobile manufacturing process, a large number of the same specifications of the fairing is required. Through the mold, the uniform shape of the fairing can be efficiently and repeatedly manufactured. For example, a set of high-quality molds can produce tens of thousands of deflectors under normal production conditions, which greatly improves production efficiency and reduces the production cost of a single piece.

Second, the type of mold
1. Injection mold
If the car fairing is made of plastic, an injection mold is usually used. The working principle of the injection mold is to melt the plastic particles after heating, inject them into the mold cavity through the injection device, cool and solidify to obtain the deflector products. Injection mold is generally composed of two parts: dynamic mold and fixed mold. There is also a cooling system inside the mold, which is used to control the cooling rate of the plastic to ensure product quality. For example, some small car fairing, using engineering plastics such as polypropylene (PP) materials, through injection mold production, molding cycle is short, the product surface quality is good.

Three, mold design points
1. Parting surface design
The O-parting surface is the separation surface of the moving die and the fixed die. The design of parting surface should take into account the shape, demoulding mode and appearance requirements of the car fairing mold. For example, if the deflector has a complex side concave or reverse structure, the location of the parting surface should be reasonably selected to facilitate the demoulding of the part. In general, the parting surface should be selected as far as possible at the largest outline of the shape of the guide hood, so that the mold structure is simple, and the appearance quality of the guide hood can be ensured, and defects such as flash edges can be avoided at the parting surface.

2. Gate design (for injection mold)
The gate is the entrance of the plastic melt into the cavity in the injection mold. The position, size and shape of the gate directly affect the quality of the car fairing. The location of the gate should be selected in the part of the thick wall of the diversion hood to ensure that the plastic melt can evenly fill the cavity. The size of the gate should be determined according to the size of the deflector and the fluidity of the plastic material. For example, the pin point gate is suitable for a fairway with high appearance quality requirements, because it leaves a small trace on the surface of the product, but has a high fluidity requirement for the plastic; The side gate is relatively simple and easy to process, but it may leave obvious gate marks on the surface of the fairway.

3. Demoulding mechanism design
The car fairing needs to be smoothly removed from the mold after forming. It is necessary to design a reasonable demoulding mechanism for the complex shape of the guide hood. For example, push rod release, push plate release or inclined top release can be used. If there is a reverse structure inside the guide hood, the inclined top demoulding is an effective way. The inclined top can move upward along a certain tilt Angle when the mold is opened, and the part of the deflector with the reverse buckle can be smoothly removed from the mold. The design of the ejection

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