Transfer of Domestic Engine Compartment Cover to Light RTM (l-RTM) Process Technology

From Western Europe, Denmark, and other countries, many of the machine hood manufacturers learned that in order to cope with the growing wind power industry, as the main part of the fan glass fiber reinforced plastic machine silo hood manufacturing, most of the use of lightweight RTM process molding.

Lightweight RTM technology is not unfamiliar to the industry, this technology is the traditional RTM process and vacuum forming process characteristics set in one.

Using this technology to shape the hood, its use of pressure than the traditional RTM process to reduce 1/3, the investment cost of the mold is less than the original RTM.

Moreover, this lightweight RTM process is the uses vacuum perfusion technology, products in the molding process, good compactness, no bubbles, to achieve a lightweight high-strength.

L-RTM technology is a two-way technology to ensure product quality but also eliminates a large number of vacuum auxiliary materials. Domestic Tianjin and Texas foreign-funded enterprises, machine hood manufacturing has been widely used in this process.

This technology is not only a major technical improvement to the current open hand lay-up process, but also compared with the two current popular closed-die processes, L-RTM is to produce lighter, higher-strength products with higher precision and faster speed.

It can be considered that under certain batch conditions, the L-RTM technology is a combination of low-cost technical routes and low-cost material routes.

Hood is a large hand lay-up technology product, its expanded area of dozens of squares, can be successfully completed with L-RTM technology such a large product.

Experience, the application of this process to other products will be solved.

Recently, from the south of the United Kingdom engaged in L-RTM injection equipment and mold design of the compositive, integration company learned that the company in 5 years has completed a complex structure of the body plate, fan cover, heavy truck hood, body top cover, light truck chassis parts, Yacht hatch cover, parking large roof, electric switch box, truck bodyboard, shower chassis, rowing, motorcycle parts, acoustic enclosures, building doors, military helmets, fire helmets, shells, radome, as well as supporting parts, entertainment large empty warehouses, amphibious vehicles, such as the overall roof hundreds of products.

Adopting the L-RTM process has one of the biggest characteristics is that can be set embedded parts, can be formed with a lightweight sandwich sheet.

It is another feature of the mold in the closed chain of the set of vacuum collectors, played a limit to the amount of resin to save material.

The effect of this process is to save raw materials, save labor, realize the environmental requirements of the operating site.

From two aspects of environmental protection and production cost analysis, the L-RTM process will be faster in the domestic hand lay-up molding process-oriented enterprises popular.

More than 10 years ago, many enterprises have introduced the traditional RTM process and technical equipment, after the equipment, technology, cost, and other reasons, ? on hold is more than 10 years.

In recent years, many factories have been using vacuum technology. As the vacuum auxiliary material belongs to disposable materials, some of the vacuum auxiliary materials are also imported from abroad, a result of forming a product, it is necessary to discard a pile of auxiliary materials, large quantities of production will cause great waste.

Therefore, between the two processes and the third route L-RTM, we might as well try.

For some sophisticated products, the use of the L-RTM molding process, we can clearly see the transparent bottom sealing mold resin infiltration creep trend, once the vacuum collection pot overflows several grams of resin, it prompts the operator’s attention, the resin has been poured into place.

The whole process of L-RTM is in accordance with the traditional RTM, and the operator according to the process requirements, first in the mold spraying plastic clothing, to be adhesive gel, will be the advanced sewing or integrated reinforcement materials and sandwich materials laid in the mold, paving finished, closed-mode suction vacuum, the mold produced negative pressure to achieve the effect of the lock mode seal.

Next, by the external mixing resin perfusion system, the set of resin dosage for perfusion, to vacuum collectors overflow resin, signaling the entire process. For the implementation of large FRP products, mold design is the most important key.

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