【正文】 數(shù)控系統(tǒng)的研制和開(kāi)發(fā)。 15mm, for bearing tolerance 177。 tool life will reduce the 1 / 2. Feed conditions and the relationship between tool wear and tear at the back of a very small area of. However, the feed rate, cutting temperature rise, wear big behind. Than the impact of cutting speed on tool small. Depth of cut on the tools did not affect the cutting speed and feed rate, but at small cutting depth of cut when cutting materials have been 機(jī)械專業(yè)中英文文獻(xiàn)翻譯 hardened layer, which will affect the tool life. The user is processed according to the material, hardness, cutting status, material type, feed rate, cutting depth, such as the option of using the cutting speed. The most appropriate selections of processing conditions are at the basis of these factors is selected. Have rules, stability, worn and tear is to achieve the ideal conditions for life. However, in actual operation, the selection tool life and tool wear, the size of changes in processing, surface quality, cutting noise, heat processing and so on. In determining the processing conditions required to study the actual situation. The heatresistant alloys such as stainless steel and hard materials, the coolant can be used best to use rigid blade. 2. Reasonable selection tool 1) when rough, it is necessary to choose high strength, good durability tool, in order to meet the rough knife when eating large back volume, the feed requirements. 2) Fine car, it is necessary to choose high precision, durability good tool to ensure that the requirements of machining accuracy. 3) In order to reduce tool change time and convenience of the knife should be used machines and machine folder knife blade. 3. A reasonable selection Fixture 1) General selection try the work piece clamping fixture to avoid the use of a dedicated fixture。s Chinese I, central China39。s CNC technology has a qualitative leap in acceptance at that time, through research and identification of country products including Beijing Everest39。 will have mechanical, chemical, thermal wear and tear. 20% increase in cutting speed。s clients are highprecision, high efficiency, the integrity of the program, and programs to provide such high precision, requiring careful choice of spindle, bearings and other features. G200 Turning Center Landshut, Germany, BMW car factory in the application of the pany achieved good results. The plant is not only the production of engines, but also by the production of cast light metal parts, plastic decorative items inside the vehicle and steering axis. Consider the quality of supervisory staff, and its very precise machining accuracy: tolerance bands for 177。 otherwise, the work piece coordinate system will be modified, not the normal processing of the work piece. Processing has been the experience of the people all know that the above position will be the tool to the cumbersome process of XαZβ Department, in the event of an accident, X or Zaxis without servo, tracking error, power outages happen, etc., the system can restart, after restart system loss of G50 work piece coordinate values set by the memory, reset back to zero run is no longer working, will need to rerun the tool and reset to XαZβ location G50. If it is production, processing, after the End of a return to the starting point for continued processing under the G50 is, in the process some errors on the work piece coordinate system may be modified. In view of the first sentence of the above procedures using G50 work piece coordinate system set up many defects, I will want to approach the work piece coordinate system fixed on the machine will process the first sentence changed to G50 XαZβ after G00 Xα Zβ, problem solved. The course of its operation only to find G50 using the abovementioned fivestep process before, that is, 1,2,3,4,5 steps to achieve, it will run the tool to a safe location, out of process, and can run automatically. Even if power outages and other unforeseen circumstances occur, restart the system, in the Edit mode to move the cursor without affecting the safe processing of the work piece processing process program segment, according to automate the processing can continue. First sentence of the above procedure to replace G50 with G00 is the substance of the work piece coordinate system fixed on the machine, no longer limited to the origin G50 Xα Zβ process constraints, without changing the work piece coordinate system, easy operation, reliability, and received an unexpected effect. Chinese metal processing online Second, control of dimensional accuracy skills 1. To amend the value of a knife up to ensure dimensional accuracy First on the knife because of error or other causes beyond the work piece work piece error tolerance, can not meet the processing requirements, can be added by modifying the knife so that the work piece size to meet the requirement to ensure that the radial dimensions are as follows: a. absolute coordinate input method According to the big decrease, a small increase principle, a knife up at 001 ~ 004 modified. Such as cut off on the 2nd slot at a big size work piece , and 002 showed up knives are , may enter the , to reduce the knife on the 2nd meeting. b. the relative coordinate method as in the previous case, enter 002 knife fill , also the same result. Similarly, the axial size of the control also and so on. Such as cylindrical with a knife on the 1st axis somewhere above processing, size, long , can be pleted at 001 knife enter . 2. Semifinishing to ensure that the impact of the elimination of screw gap dimensional accuracy For the majority of CNC lathe using a longer time, because of the effects of screw space and processing of the work piece dimensions are often unstable situation. At this time, we can rough after finishing a halfspace to 機(jī)械專業(yè)中英文文獻(xiàn)翻譯 eliminate the effects of screw. 1, such as a knife with G71 cylindri