1. The main axis of a high-speed airport. Since the punch die needs to be milled very fast in high-speed cutting, the speed of the spindle must be kept up accordingly. Generally, it needs to be adjustable from 10,000 to 100,000 per minute, with fast speed increase and fast and accurate stop performance. Therefore, the bearing structure of the lathe generally adopts hydrostatic pressure, air static pressure and suspension magnetic suspension.
2. Because high-speed cutting lathes are controlled by computer programs, they must have a central processing unit that can quickly process a large amount of data, a large-capacity storage device; have faster data transmission capabilities and network transmission capabilities; have error compensation functions, including measurement error compensation , Quadrant error compensation, thermal error compensation.
3. The drive system requires a relatively large feed rate and acceleration, generally reaching an acceleration of 20-30 meters per minute and 20-40 meters per second squared.
4. The processing of punch die is carried out by milling tools. Milling without tens of thousands of revolutions tests the hardness and wear resistance of the tools. Therefore, cemented carbide, polycrystalline diamond, etc. must be used for the material of the tool. At the same time, the positioning of the tool must be accurate, and the error should be controlled within 0.001mm.
Common defects analysis of vacuum carburizing parts of punch die
(1) Low hardness.
The amount of retained austenite is one of the reasons for the low hardness of the punch die. The amount of retained austenite in the carburized layer is often due to the high carburizing temperature and the high surface carbon concentration. Another reason for the low hardness of the punch die is the low surface carbon concentration. The reasons for the low surface carbon concentration are: the carburizing temperature is too low; the carburizing gas flow is small; a large amount of air is absorbed in the vacuum quenching oil; other oils, such as cylinder oil, are mixed into the vacuum quenching oil in large quantities.
(2) The depth of the carburized layer does not meet the technical requirements.
The reason that the carburized layer depth of the punch die exceeds the requirement is the high carburizing temperature or the long carburizing time. The reason why the depth is lower than the technical requirements is that the carburizing temperature is low or the carburizing time is short.
(3) The carburized layer of the punch die itself is not uniform.
The reasons for this situation may be: air is mixed into the carburizing gas; pulse carburizing is not used; the pressure of carburizing gas is too low; the amount of furnace installed is too much and too dense; the purity of carburizing gas is low, resulting in more Carbon black and so on.
(4) There is a lot of carbon black, and carbon black is also attached to the press die.
When a large amount of carbon black is produced during the carburizing process, it may cause electrical short circuit between the heater and the furnace body, the heater and the heater, which will increase the maintenance workload of the equipment; the small holes of the punch die will be blocked and the carburized layer will not be blocked. Evenly, increase the workload of removing carbon black on the surface of the part.
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