Development trend of hole processing technology (4)
6-speed thread cutting tool <br> <br> with the development of CNC cutting, has developed a number of the corresponding complex tool products, such as the integration of new drilling and thread cutting thread cutting, drilling and thread The cutting is done in one stroke. This composite tool makes the threaded hole processing more reasonable and the machining efficiency is greatly improved. The new end mill for thread cutting adopts the helical cutting interpolation method. The end mill can process the threaded holes of M3 or more, and the chip discharging performance is good, and stable high-precision machining effect can be obtained. General taps are also moving toward high-speed cutting and machining of high-hardness steels, and the range of applications for tapping tools is expanding. The basic conditions for high-speed cutting of taps are as follows: (1) The cutting function of the cutter teeth should be emphasized. For example, the taps with the back angle of the cutter teeth are selected, and the cutting effect is ideal. (2) The clamps should be clamped with good rigidity. For example, spring clamps, hot-mounted fixtures, etc. are used. (3) Machine tools such as machining centers should have high synchronization accuracy during the cutting and turning process.
For high-speed tapping operations, stable high-precision and high-efficiency thread cutting can be achieved by satisfying the functions of tapping tools, tool paths and cutting conditions, fixtures, and machining centers used.
7 Micro hole processing technology required in the future
With the development of IT-related industries, the demand for parts and components of devices used in the optical and electronic industries has increased rapidly in recent years, and this growth has stimulated the rapid development of micro-shape and high-precision processing technology. Among them, the development and application of micro-hole processing technology is particularly eye-catching. Micro-hole processing has long been applied in the processing of printed circuit boards, etc., and a variety of materials to be processed, including steel, can be processed by small diameters with drill bits. For example, Dijet has recently developed a new twist drill that sinter polycrystalline diamond and cemented carbide into a single cutting edge for high-speed, high-precision machining of aluminum alloys, magnesium alloys, graphite and plastics. The tool life is also greatly extended. The drill has a helix angle of 30° and a minimum diameter of φ0.4 mm. At the same time, a drill bit is produced with a minimum diameter of φ0.88 mm. These types of drill products have been serialized, and the most notable feature is that the surface roughness of the machine is greatly improved.
Mitsubishi Materials Corporation has developed a diamond-coated carbide drill with a diameter of φ0.2 to 3.0 mm. When the aluminum alloy is processed, the speed can be as high as 32000r/min, the feed rate is 0.09mm/r, and the feed speed is 3008mm/min. Under this condition, the tool life is 300,000 holes. Among the drill bits for machining high-hardness workpieces, the drills developed by MMC Kobelco Tools have performed extremely well. When the SKD11 material (60HRC) is machined with the company's φ0.4mm drill, it can perform long-term stable cutting at a speed of 6000r/min and a feed rate of 30mm/min. Mitsubishi Materials Corporation recently introduced a small-diameter drill bit (φ2mm) with oil supply hole. SUS630 material is processed under the conditions of cutting speed of 60m/min and feed rate of 0.02mm/r (length to diameter ratio is L/D= 6) Deep hole, the tool life is more than 600 holes.
At present, in the processing of small-diameter holes, the diameter of cutting with a drill can be as small as about φ50 μm. Holes smaller than φ50 μm are mostly fabricated by electrical machining. In order to suppress the occurrence of burrs, many researchers have proposed that ultrasonic vibration cutting can be used. At present, an ultrasonic vibration cutting mode with a wide range of applications and reasonable processes is being explored, including research on the adaptability of machine tools. With the smooth resolution of these problems, it is expected that in the future, small deep hole machining with smaller diameter and larger L/D value will be realized, the drilling speed will be faster, and the machining accuracy will be higher.
In recent years, with the advent of high-speed milling, cutting machining centering on milling tools is entering a high-speed and high-precision machining period. At present, the speed of hole machining is obviously lagging behind other cutting processes. The rapid production of parts is an important condition for the survival of the manufacturing industry. Therefore, the hole processing technology cannot be a bottleneck process for machining. It must follow the direction of high-speed cutting, and step into the high-speed and high-precision processing as soon as possible.
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