Polyurethanes are used in flexible foams, rigid foams, reaction injection molded (RIM) elastomers, cast elastomers, as well as soles, adhesives, coatings, sealants, etc., where foam is the majority, while soft foam in foam Take up the majority. Soft foam is mainly used in shockproof furniture, mattresses, carpets, car seats, shockproof packaging, etc. The rigid foam is mainly used in the edge of the edge. It can be used as a laminate for construction. It can be combined with soft materials such as paper, aluminum foil or hard materials such as aluminum or steel. It can also be used in refrigerators, freezers, etc. In addition, there are applications in packaging, transportation and so on. RIM products are mainly used in the automotive industry, including instrument panels, bumpers, main panels, standard windows, as well as agricultural equipment, mining equipment, equipment enclosures and sporting goods. Polyurethane castings are mainly used in industrial tires, skate wheels, printer rollers, conveyor belts, pumps, etc.
All soft foam waste can be used to re-bond the lower layer of the carpet. The soft foam is separated and purified and cut into pieces of a certain size. The foamed material is coated with a binder. The binder is toluene diisocyanate (TDI) or diphenylguanidinium diisocyanate (MDI) and polyether alcohol. The polyurethane of the raw material is used in an amount of 10% to 20% by weight of the foam. After adding the catalyst, it is mixed, put into a mold and pressed, and heated and pressed to cure. Molded products having different densities (40-100 kg/m3) can be obtained depending on the applied pressure. Another method of using foam is to pulverize the soft foam into a powder of a certain size at a low temperature, and the powder is mixed with the polyol, and the amount of the polyol can be 15%-20% relative to the polyol; the polyol and the powder are made of The slurry is mixed with isocyanic acid and then foamed on a foam processing equipment. By controlling the amount of catalyst and isocyanic acid, a good foam can be obtained, which is comparable to the foam properties of the original material.
In addition, the polyurethane is subjected to alcoholysis, hydrolysis, cracking, etc., and the polyol and related raw materials can be recovered. It can be steam hydrolyzed, glycol alcoholysis, cracking and the like.
5-axis CNC machine tools are the mainstay of DAYUE. These systems were once reserved for complex professional applications, and Dayue has realized the value of using 5-axis machine tools in every project. Many of them have been able to minimize delivery time, increase efficiency and therefore increase profitability. The following are some factors that guide their decision:
1. Save time - One of the most obvious advantages of a 5-axis CNC Milling machine is that it reduces the time required to complete the project. A standard 3-axis machine tool may require several different settings and more than 5 hours to complete, while its 5-axis machine tool can complete parts in a few operations, from start to completion in less than two hours.
There are two types of 5-axis machining: 5-sided (sometimes called 3 + 2 machining) and simultaneous 5-axis. Both methods are faster than traditional 3-axis machining, but 5-sided machining is faster and easier to program. Experts believe that simultaneous 5-axis machining will eventually produce a smoother surface finish, which is often required for competing aerospace applications.
2. Reduce the cost of parts-you can also use 5-axis machining to reduce the overall production cost of parts. Since traditional three-axis machine tools can only work on one side of one part at a time, parts that require multiple finishing surfaces need to be recalibrated, and in some cases, need to be reprogrammed. All of these increase the overall production time and labor, all of which are related to the cost of the final product.
3. Improved molding-molds made of liquid silicone rubber (LSR) or similar materials are becoming more and more complex. This is the result of design development in certain industries (such as medical device manufacturing), which require the increase of the versatility of their new products. In order to adapt to this situation, many manufacturers are transitioning to 5-axis machine tools. Now, almost every professional mold maker realizes the value of using advanced equipment to meet their needs.
Although three-axis machines are sufficient for milling simple molds, these devices may not even be able to handle some of the more complex designs that appear in today's products. They are simply not accurate or fast enough to meet evolving and strict industry standards. Such projects specifically require the use of modern 5-axis milling machines.
4. Compatible with CAD/CAM-In the past year or two, the technology behind computer-aided design and computer-aided manufacturing has developed by leaps and bounds. There used to be limited 5-axis machine tool software support, and almost all the most popular CAM software developers have upgraded their products to accommodate the other two axes. Autodesk`s Fusion 360 is a good example of how software programmers can support 5-axis milling machines. The final version of Fusion 360 represents the first time for developers to provide native support for 5-axis machining in their software, but it will certainly not be the last.
5. Suitable for general projects and special projects-Some manufacturers and machine shops have the impression that 5-axis machine tools are only used for special projects or highly complex parts. Although they can simplify complex tasks, this is not their only application. Like its more traditional CNC machine tools, five-axis milling machines are also good at simple parts and parts, requiring the least amount of work.
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