The purpose of casting molds is to sell them to users for service. For casting molds to get into the hands of downstream users, they must be marketable. With the advancement of industrialization, this is believed to be based on estimates. the development of the industry which, in the future, the following six aspects will be the development direction of the casting mold industry.
The first is intelligent casting molds that serve emerging strategic industries, and energy-saving and environmentally friendly casting molds that serve energy-saving and environmentally friendly industries.
The second is; the new generation of information technology industry serving precision and ultra-precision casting molds with sensing and other functions;
The third is precision casting molds and ultra-precision pfor medical devices intended for the biological industry;
The fourth concerns “high-end equipment: intelligent casting molds serving the “manufacturing industry”;
The fifth concerns casting molds for the new energy industry. These molds mainly include new blade molds for megawatt wind turbines. , pin molds and motor molds, etc. ;
The sixth is a casting mold intended for the new energy automobile industry.
With the development of industries related to the casting mold industry, the casting mold industry should timely adjust its production scale and product structure, keep pace and better grasp future development trends in order to adapt to market demand in the new era.
What is the difference between vinyl resin and epoxy resin used in wind turbine blades ?
Method:
A wind turbine blade root The method for improving the second layer is characterized in that it includes the following steps:
< p>a. The prefabricated blade root mold and its spreading; taking the prefabricated blade root mold, the prefabricated blade root mold includes the prefabricated blade root mold holder; p>(1) Semi-circular arc-shaped outer surface installed on the blade root prefabricated mold holder (1)
(2) Prefabricated root mold turning arm
(3) and the locking wheel of the rotating arm of the rotating arm of the root precast mold (3)
(4) The universal wheel of the precast mold installed under the support of prefabricated root mold (1)
p>< p>(5) G-shaped clamping device for clamping the semicircular arc-shaped outer surface (2) and the glass cloth(6) The outer surface in the shape of a semicircular arc (2) The diameteris the value obtained by subtracting the thickness of the glass fabric layer at the blade root from the diameter of the blade root mold. Lay the fiberglass cloth
(7) in reverse order on the semi. arc-shaped outer surface of the prefabricated blade root mold (2), the fiberglass cloth (7) will naturally sag by its own gravity and will be laid gently and naturally on the semi-arc-shaped outer surface -circular (2), then will use the G-shaped clamp (6) to clamp the fiberglass cloth (7) Clamp on the pre-made mold at the base of the blade;
b . Lay the fiberglass cloth on the blade mold and lay the skin and fiberglass cloth on the concave arc blade root mold.
(8) In the shape of arc of (9), some areas are fixed with glue to fix the position of the fiberglass cloth (8) to ensure that the fiberglass cloth (8) is positionedprecisely, smooth and wrinkle-free;
c. Pre-made blade roots. Flipping and lifting the mold will raise the chain.
c.p>
(10) Use a shackle
(11) to connect to the rotation arm of the precast mold of root (3), and use a suspender
(12) to lift the blade foot. Lift the prefabricated mold and the fiberglass cloth (7) placed on the arc-shaped outer surface together semi-circular (2), loosen the lock handwheel (4) of the turning arm (4), so that the turning arm (3) can rotate freely, and the rotating arm (3) can rotate freely. After the prefabricated root mold and the fiberglass cloth (7) placed on the semi-circular arc-shaped outer surface (2) are flipped 180°, lock the locking handwheel. (4) again, and turn the root premade mold upside down and put it down. The fiberglass fabric (7) on the exterior surfacesemicircular arc-shaped clamp (2) is smoothly placed in the concave arc blade root mold (9), and then the G-shaped clamping device (6) is released, so that the fabric fiberglass (7) is placed flat in the concave arc blade root mold (9), then the prefabricated blade root mold is lifted away from the blade root mold (9).
d. The fiberglass fabric attachment (7) will be placed. Place the fiberglass cloth (7) into the concave arc blade root mold (9) every 6-8 layers on the flange (13); ) sides of the blade root mold (9). Make a flange and use double-sided tape to stick the flange to the mold flange (13) to secure the fiberglass cloth (7) in the blade root mold (9):< /p>< p>e. Seal the vacuum and injection molding to fit the entire guide system onto the blade root mold (9). Then vacuum seal the film with a clothfiberglass in the blade root mold (9). the vacuum film is discharged, guide it into the guide system through the glue injection hole. Inject the resin so that the fiberglass fabric is saturated with the resin. After the resin injection is completed, heat and solidify the resin to form.
With the development of wind power until today, cost pressure has always been a problem facing the industry. At the just concluded 6th Asian Wind Power Conference, industry experts believed that the gradual replacement of the currently widely used epoxy resin with more cost-effective vinyl resin will become the development trend of wind blades in the future.
Xiao Shuangyin, an engineer at Shangwei Wind Power Materials Co., Ltd., pointed out that the most important advantage of replacing epoxy resin with vinyl resin isthat it can reduce the cost of blades. The cost of the blades represents 20 to 30% of the cost of the entire electricity production device, the choice of materials is therefore crucial. Replacing epoxy resin with vinyl can reduce costs by around 10%.
The technical staff of Jinling DSM Resin Co., Ltd. of the DSM Composite Resin Group stated that 10% is only a very conservative estimate. Once the main blade material is replaced, the surface protective layer supporting products such as gelcoat will also be changed accordingly, and the saving effect will be just as considerable. Additionally, casting costs represent a high proportion in blade production. Post-curing and other processing are not required after replacing the material, which will greatly improve the use efficiency of the mold. Taking a 1.5MW blade as an example, the mold cost is about 3-4 millione yuan. It takes about two days to produce a blade using epoxy resin as the base material, but only one day using vinyl resin.
She also pointed out another advantage of vinyl resin replacing epoxy resin, which is good craftsmanship. Vinyl resin can be used without changing the original design of the epoxy resin casting structure., directly replaces epoxy resin. At the same time, since vinyl resin is similar to unsaturated polyester resin, another main material used for blades, we can also learn from the mature blade preparation process using existing unsaturated resins. In addition, vinyl resin has the mechanical properties of epoxy resin, and various performance indicators such as fatigue resistance and rigidity can fully meet the design requirements. In addition, the materials cOmposites are currently used on wind turbine blades. The performance indicators of vinyl resin, fiberglass and other materials, after reasonable matching, are not inferior to those of epoxy system composite materials.
Xiao Shuangyin also affirmed the performance of vinyl resin. He told reporters that vinyl resin has already been widely used in ships and yachts, and its various properties have been confirmed by many parties.
It is understood that although vinyl resin has great advantages, the development of its applications is still in its infancy. Domestic and foreign companies are actively conducting research on the application of vinyl resin to blades. Limited by various factors, it will take some time to achieve truly large-scale commercial production. However, many fabblade makers, such as Danish Elm Glass Fiber Products Co., Ltd. and AVIC Whitten Company, have begun to consider or begin applying vinyl resin.
Kebao Chemical specializes in vinyl resin and unsaturated polyester resin