Characteristic
When designing with polymers, look for polymers with different functions in the system. Polymers have different properties, producing smoother, more relaxed drives and less wear. In addition, matching the same plastic in adjacent gears makes it easier to match dimensional changes that may occur when temperature or humidity changes. This is particularly helpful for housing. For more information, please read this article. This article will introduce you to polymer gears and their characteristics. This article will introduce the main advantages and disadvantages of each method.
Duration
The company's polyoxymethylene/acetal resin production line, including duration POM, is based on noise reduction technology for plastic gears, bearings, automotive components, and audio-visual equipment. These products have excellent noise and vibration reduction performance and are used in most gear applications. Read on to learn more about this innovative resin. Here are some of the duration's advantages.
Plastic gears have lower wear and friction than metal gears. From the mold to the final product, its shape will change. Tooth wear was also significantly reduced. This is a problem when the teeth at the top of the gear are too thin, and the bottom is too thick. The result is that the top of the gear is too thin, and the bottom is too thick. This will lead to excessive pressure angle, resulting in bonding and wear.
MC nylon
MC nylon and POM are two common polymers used in plastic gears. MC nylon is more robust than POM, and its tensile strength is 1.2 times that of POM. Both materials can be used in bearing assemblies. POM is usually used for smaller gear batches, while MC nylon is best used for larger gear batches. POM is more durable than MC nylon, and POM is more suitable for applications in contact with water or high humidity.
The temperature of both materials rises during engagement and ejection from the mold. The results of MC nylon and metal gear pairs are similar. The difference lies in the temperature when the teeth mesh. Both polymers have good thermal conductivity, so their service life in gear sets may be longer. However, if you compare gears made of different materials, you should be careful not to choose plastic over metal.
polyurethane
The forming process of polyurethane gear involves many steps, each with different operating parameters. This process includes cooling, curing, ejection from the mold, and final trimming. The final result is a rigid and flexible gear. These factors, combined with the flexibility of polyurethane, provide a high degree of reliability. The following are the steps in the process. Let's explore them in more detail.
First, you need to understand the manufacturing process. Polyurethane gear is made of rubber or metal mold, and polyurethane elastomer is injected into the mold. Polyurethane gears are vulcanized twice and then heated for 24 hours. In the casting process, most gear sizes have been completed; The final product may need to process minor details. Polyurethane gears have many advantages, including flexibility, rigidity, and noiseless operation.
Liquid crystalline polymer
Injection molded parts with complex characteristics can benefit from materials such as liquid crystal polymers. This material is
Relatively nonflammable, chemical and heat resistant, and extremely dense (1.8 grams per cubic centimeter). DTUL test shows that the material can withstand a load of 275 ºC without fracture. They also have low linear expansion and are very suitable for medical applications.
Usually, designers should start from the published data sheet when selecting gear materials. However, before selecting polymers for specific applications, it is essential to test potential gear resin formulations for fatigue, wear, and noise. The data from Celanese plastic gear evaluation and research department will contribute to the development of gear design. However, the gear design should eventually be verified on site.
polycarbonate
The performance of polycarbonate gear depends on its filling material and its modulus. Fibers and fillers can Significantly change the performance of gears. Adding short glass fiber to acetal copolymer can produce gears with double tensile strength and three times the bending modulus of the base resin. The addition of fibers with a length of more than 10 mm has a significant effect on strength and stiffness.
In addition to being lightweight, plastic gears can also be manufactured to meet the requirements of advanced technology. Electromechanical and mechanical components. In addition, many plastic gears can reach the quality level of AGMA Q7. Molders can also produce Q10 gears. For gear manufacturers, choosing the suitable plastic material for the project is crucial to the final result. For those unsure how to make polycarbonate gears, please consider the advantages and disadvantages of each material.
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