Detailed Explanation of Manufacturing Aspheric Surface by Copying Method
The copying method is also one of the additional processing methods. It has been more than 20 years since optical parts were manufactured by copying method. At the beginning, grating copying was used. Later, this copying technology was improved to copy optical parts, especially aspheric optical parts. Copying optical parts has been commercialized abroad, and this work has also been carried out in China, and practical aspherical surfaces have been copied. The wide application of aspheric surface will promote the continuous improvement of the process of copying aspheric surface, so that the cheap aspheric surface replicas will be widely used in optical instruments. It is also widely used in NC milling machine parts processing.
There are two types of replication mode layers used in the previous project: reflective and transmissive.
The development of organic synthetic materials, especially the synthesis of new high temperature resistant resins, such as 650 epoxy resin and CR-39, has played a good role in reproducing optical parts. The development of optical industry has increased the number of aspherical surfaces that are difficult to machine. It is very important to use replication method for production.
1. Reflective coating: material - epoxy resin
630'. 618'. 616 and other epoxy resins are thermosetting resins. The refractive index of these resins is 1.50 ^ -1.55, which is close to the refractive index of optical glass and has a high value for glass
The bonding performance of bonded parts shall be high and low temperature resistant (-- 45C-100 ℃), and the shrinkage shall be less than -0.01%.
2. Transmission coating: material - CR-39
The valence emissivity of cR-39 material is similar to that of K9 glass, the refractive index is 1.48-1.49, and it is a colorless transparent body. The transmissivity to visible light is 92%, lighter than that of glass, and the specific gravity is 1.3.
It is harder than ordinary plastic. The thermal deformation degree is 100 degrees, which is stable for general organic brand agents such as ethanol, methylbenzene, acetone, gasoline, etc. Therefore, this thermosetting material has the characteristics of epoxy resin.
Hangzhou Datian CNC efficient CNC milling machine www.hzdtsk.com provides support.
In fact, it is difficult to solve the problem of whether a three-axis CNC machining center is better or a four-axis machining center is better. There is only a problem that is not suitable for machining some kinds of parts. Basically, all three-axis machining centers can process the parts that can be processed by a four axis machining center, while the parts that can be processed by a four axis machining center may not be processed by a three-axis machining center.
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