Application of FRP in agricultural machinery

When it comes to agricultural machinery, people often think of silly, big, silly, rough image. In fact, with the gradual improvement of market and user requirements, the requirements for the appearance of the machine are getting higher and higher. Some agricultural machinery enterprises began to use glass fiber reinforced plastic parts in machinery to meet the needs of streamlined modeling. The streamlined appearance gives the user a beautiful, comfortable and luxurious feeling, and changes the old face of the appearance of agricultural machinery products with simple lines and dull, which is favored by the market and users.

Glass fiber reinforced plastic is a new type of composite material, the scientific name of glass fiber reinforced plastic. Its base is a polymer organic resin reinforced with glass fibers or other fabrics. Because FRP has a small density, high strength, acid and alkali resistance, non-magnetic, easy to form and many other outstanding advantages, so since its birth more than half a century, the field of application has increased dramatically, has been widely used in aviation, shipbuilding, construction, chemical, automotive and other industrial fields. Among them, some famous automobile companies in Germany, France and other countries have manufactured millions of FRP shell cars, while the front and rear bumpers of the car and the instrument panel are widely used. The famous American agricultural machinery company JOHNDEERE Company 9400, 9650CTS, 9750STS and many other models of tractors, combine harvesters are also widely used glass fiber reinforced plastic streamline covering parts. The 3518CTS, 3070, and other combine harvesters and tractors of domestic Deerjia Lian and Deertiantuo also use fiberglass streamline covering parts.

The main raw materials of FRP are glass fiber and resin. Glass fiber plays a strengthening role in glass fiber reinforced plastics. Commonly used glass fiber with or without twist roving, cut fiber viscose and without twist roving. The role of the resin is to bond the glass fibers firmly together, so that the fibers are jointly stressed. Commonly used resins are unsaturated polyester resin, acrylic resin. The usual FRP production process includes SMC molding, jet molding, and manual paste molding.

The product size of SMC molding is accurate and uniform, but the mold cost is high. The production process of manual paste is simple and the cost is low, but the product size is not accurate and the thickness is not uniform.

The development process of FRP parts includes the following steps:

(1) Making models according to the shape and size of the parts, make 1:1 parts models with gypsum and wood. Because gypsum and other materials are easy to shape, the shape of the parts can be modified several times as needed until a satisfactory shape is made. After the model is formed, its surface should be carefully treated to make it smooth and smooth with a smooth surface.

(2) The production of FRP mold The mold of FRP parts is directly formed on the model to make a negative mold. The mold material is generally made of fiberglass steel. When making a mold, it is divided into several parts according to the specific shape of the parts and the requirements of demoulding.

(3) The production of FRP agricultural machinery products, especially tractors and harvesters, is not very large, and when making FRP parts, it is usually made by hand. The process flow is as follows: first, the mold surface is coated with release agent: to be released agent drying: surface gelcoat: to be gelcoat gel: brush resin liquid, spread glass fiber material, immersion, exhaust bubble, to reach the required thickness; Curing at room temperature; Demoulding: cutting edge, drilling.

The use of FRP parts on agricultural machines has many outstanding advantages :(1) It can be directly modeled, the shape and size of the product are not limited, and it can be convenient to produce complex, smooth and beautiful products. (2) Short development cycle. (3) Simple equipment, less investment. (4) After the mold is made, manual molding, simple operation. (5) Easy deformation. (6) Low cost.

The speed of new product development of combine harvester and tractor is getting faster and faster, and the design of appearance and the manufacture of covering parts have become important factors affecting the development schedule.

The traditional sheet metal manufacturing method, to make the covering parts form a batch, not only the cycle is long, the investment is large, and the effect is not necessarily good. The application of FRP parts can solve this problem well, especially in the trial production, small batch production stage, the advantage is greater. In terms of product improvement and innovation, to meet the needs of users seeking new, seeking differences, seeking beauty. When developing the arc cab of 3518STS combine harvester, Deerjialian adopts a large number of FRP parts as covering parts, which greatly speeds up the product development speed and reduces the product development cost. Beautiful shape of FRP parts, smooth surface, bright, there is no traditional rice pieces easy to rust, easy to knock shortcomings. Moreover, the beautiful and beautiful cab greatly improves the product image of the whole machine, improves the market share, and meets the needs of users. When Deere Tiantuo developed 5320 new tractors, a large number of FRP parts were used in the engine hood, wheel arch cover and cab roof, so that the newly developed tractors have a beautiful streamline appearance and have been recognized by the market.

With the development of the economy and the improvement of people's living standards, people's requirements for a machine are not only functional and reliability requirements, but also higher requirements for the appearance and color matching of the machine. Because FRP parts have the above advantages, it will have a wider application prospect in combine harvesters, tractors and other agricultural machinery.

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