[Process Dismantling] The Matrix Light Strip That BYD Loves, How To Be Efficient, High Quality And More Color Injection Molding?

Recently, "BYD" is on fire again! With the sales of "162,500 units in July, a year-on-year increase of 184.7%", it ranks first in the manufacturer's retail sales list!

Previously, BYD's sales in the first half of the year were also very gratifying - 641,000 units! Tesla's global delivery in the first half of the year was 564,000 vehicles, and BYD surpassed Tesla for the first time to become the global sales champion of new energy vehicles.

Sales have been rising all the way, and the demand for lights, a key component of the car, has also risen. No, since this year, BYD has cooperated with Haitian Plastic Machinery, Chen Hsong Group, Thailand

Companies such as Rui Machinery and Yizumi purchase injection molding machine equipment for the production of multi-component automotive lights.

So, for the lamp factory, after buying the injection molding machine, how to realize the multi-color and multi-component injection molding of the lamp with high efficiency and high quality? What process pain points are worth paying attention to?

Matrix light strips become the new favorite of new energy vehicle lighting

From the early halogen lamps, xenon, etc., to today's LED light source, technological innovation has brought revolutionary development to the automotive lighting industry.

LED, OLED, laser light source and other technologies not only make automobile lights more energy-saving, but also have simple structure, changeable forms and high light intensity. It can be said that LED and laser lights

Energy-saving light sources such as energy sources have great application potential in lighting, atmosphere creation and decoration, and they are the main choice for new energy vehicles.

Compared with the previous single-point light source, the matrix light strip composed of a large number of light-emitting units has become a trend. The matrix light strip running across the front or rear of the car is supplemented by various

The color light source not only increases driving safety, but also highlights the technology, environmental protection, intelligence and other characteristics of new energy vehicles. The application of new light sources is worthy of attention.

Multi-color injection molding silicone lens, mold quality is the key

Yu Bin, senior application manager of Haitian International's multi-component industry, told me that these matrix-type combined light strips have various forms and

The inch can be longer and thicker, and the introduction of silicone raw materials requires the injection molding machine to have stronger low-speed stability and higher injection accuracy, and the mold size is larger and requires greater

of the mold space.

"In response to the above requirements, we use layered injection molding, low-pressure injection molding functions, combined with multi-station rotating shaft, turntable technology, and the introduction of large-scale hybrid injection molding machines.

type, the structure of the horizontal beam to meet the needs of these new processes. "Yu Bin said.

Specifically, the lens materials in the automotive lighting industry are mainly optical-grade PC/PMMA. The advantages of optical-grade plastics are simple technology and low production cost, but compared with glass, high temperature resistance, aging resistance and light transmittance are relatively weak. , while the silicone lens combines the advantages of glass and optical-grade plastics, and shows more excellent performance in terms of light transmittance, molding difficulty, and aging resistance.

These silicone lenses are usually molded by multi-color injection molding. Whether a qualified silicone optical part can be produced depends on the quality of the mold. According to Yu Bin, due to the low viscosity of silica gel and very good fluidity, the distance between the insert and the main mold is calculated in μm, and even if it exceeds 4 μm, there will still be flash, so the polishing and processing technology of the mold is proposed. high demands.

In addition, the use of PC/PMMA as a heat-sensitive raw material is easy to cause yellowing and black spots in the product. This can be solved by designing a reasonable screw structure and surface technology to solve the problem of shear heat of the sticky material, and choose the screw diameter suitable for the weight of the product. To solve the problem of residence time of raw materials.

"As far as I know, at present, there are not many multi-material mold manufacturers in China that can perfectly solve the combination of silicone and different materials, and some of them do not accept external orders. Therefore, the production capacity of silicone molds at this stage restricts the development of this industry. I believe that once After this mold technology is generally mastered, it will usher in a big change." Yu Bin added.

At present, Haitian's JU, MA and Zhafir series injection molding machines can be used for multi-color injection molding of automotive lamps. "From multi-material process, laminated injection molding process, to color mixing process; from hydraulic press solution, hybrid solution, to pure electric injection molding solution; from two-station, to three-station, and even to 6-station, all can be used to produce light guides , decorative light strips, front and rear headlights, transverse headlights or taillights and other lamp lens products." Yu Bin said.

Among them, the JU/M horizontal-to-beam series and JE/M horizontal-to-beam series models are used to produce super-large multi-component products, such as integral sunroofs, integral front face grille etc.