First, the preface CNC machine tools have been increasingly used in modern manufacturing, and have played an advantage that ordinary machine tools can't match. CNC machine tools mainly have the following characteristics: 1. The drive chain is short. Compared with the ordinary machine tool, the spindle drive is no longer the motor-belt-gear mechanism shifting, but the horizontal and vertical feed are respectively driven by the two servo motors, no longer use the hanging wheel. , traditional components such as clutches, the transmission chain is greatly shortened. 2. High rigidity, in order to match the high precision of the numerical control system, the rigidity of the numerical control machine is high, so as to adapt to the high-precision machining requirements. 3. Lightly drag, the knife holder (workbench) moves with the ball screw pair, the friction is small, and the movement is light. The special bearing for the support at both ends of the screw has a larger pressure angle than the ordinary bearing and is matched at the factory; the lubrication part of the CNC machine is automatically lubricated with oil mist. These measures make the CNC machine move lightly. Second, CNC machine tool processing characteristics 1. High degree of automation can reduce the operator's physical labor intensity. The CNC machining process is automatically completed according to the input program. The operator only needs to start the tool setting, loading and unloading the workpiece, and changing the tool. During the machining process, the machine is mainly observed and supervised. However, due to the high technical content of the CNC machine tools, the operator's mental work is correspondingly improved. 2. The processed parts have high precision and stable quality. The positioning accuracy and repeat positioning accuracy of CNC machine tools are very high, and it is easier to ensure the consistency of batch parts. As long as the process design and procedures are correct and reasonable, and with careful operation, it can ensure high precision of parts and easy to Quality control is carried out during the processing. 3. High production efficiency. CNC machine tool processing can process multiple machining surfaces in one clamping, generally only the first part is detected, so it can save many auxiliary processes, such as scribing and size inspection, etc. during the processing of ordinary machine tools in the province, and reduce the auxiliary time. Due to the stable quality of the parts machined by CNC, it brings convenience to the subsequent process, and its comprehensive efficiency is obviously improved. 4. Facilitate the development and modification of new products. CNC machining generally does not require a lot of complicated process equipment. By programming the machining program, parts with complex shapes and high precision requirements can be processed. When the product is modified and the design is changed, the program is changed without redesigning the tooling. Therefore, CNC machining can greatly shorten the product development cycle, providing a shortcut for the development of new products, product improvement and retrofit. 5. Can be developed to more advanced manufacturing systems. CNC machine tools and their processing technology are the basis of computer-aided manufacturing. 6. The initial investment is large. This is due to the high cost of CNC machine tools, the long processing preparation cycle, and high maintenance costs. 7. Maintenance requirements are high. CNC machine tools are typical products of technology-intensive mechatronics. They need maintenance personnel to understand both mechanical and microelectronics maintenance, as well as better maintenance equipment. Third, suitable for CNC machine tool parts 1. Most suitable for a variety of small and medium batch parts. With the gradual decline in the manufacturing cost of CNC machine tools, the processing of large quantities of parts has now appeared, both domestically and abroad. When processing small batches and single-piece production, it is also possible to shorten the commissioning time of the program and the preparation time of the tooling. 2. Parts with high precision requirements. The CNC machine tool has good rigidity, high manufacturing precision, accurate tool setting, and convenient size compensation, so it can process parts with high dimensional accuracy. 3. Parts with small surface roughness values. The surface roughness depends on the cutting speed and the feed rate in the case where the material of the workpiece and the tool, the finishing allowance and the tool angle are constant. Ordinary machine tools are constant speed, different cutting speeds are different. For example, CNC lathes have constant line speed cutting function. The same line speed can be used for the end face and outer diameter of different diameters to ensure that the surface roughness value is small and consistent. When processing surfaces with different surface roughness, the surface with small roughness is selected for small feed speed, and the surface with large roughness is selected for larger feed speed, and the variability is very good, which is difficult to achieve in ordinary machine tools. 4. Parts with complex contours. Any plane curve can be approximated by a straight line or an arc. The CNC machine has a circular interpolation function that can process various complex contour parts.
R507 is an HFC blend designed to be a
replacement for R502 in low and medium temperature refrigeration applications.
It is similar in characteristics to R404A however, being an azeotropic blend,
R507A does not suffer from glide or fractionation making it suitable for
additional applications such as centrifugal compressors.
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