In the early 1970s, drilling machines were still controlled by ordinary relays in the world. For example, MEGA50 of ELDORADO Company of the United States entering the United States from the 1970s to the 1980s, T30-3-250 of TBT Company of Germany, B4-H30-C/L of NAGEL Company, and DEG type drilling machines of Japan Kanzaki Advanced Seiko Co., Ltd. Controlled by relays.
In the late 1980s, due to the advent of numerical control technology, it was gradually applied to deep-hole drilling machines, especially after 90 years. For example, TBT's ML series deep hole drilling machine in addition to the feed system introduced in the early 1990s changed from a mechanical continuously variable transmission to an AC servo motor to drive a ball screw pair, and the feed slide rail used a rolling linear guide, the drill box transmission In order to ensure high-speed rotation and smooth precision, the stepped drive driven by the exchange pulley and belt, and the two-speed motor becomes the variable frequency motor of the stepless speed regulation to the electric spindle drive, which is used for drilling small hole deep hole drilling machine and deep hole drilling machine. The quality of the level creates favorable conditions.
In order to process the intersections or arbitrary angles on certain parts, or oblique holes, vertical holes or parallel holes at a certain angle to the center line of the machined parts, various special deep hole drilling machines have been specially developed in various countries. For example, it is specially designed for processing oil holes on the crankshaft, inclined oil holes on the connecting rod, parallel holes and a plurality of radial discharge holes of the feed mechanical feeding die. It is especially suitable for BW250-KW deep hole drilling machines for crankshaft oil holes of medium and large trucks. They all have X, Y, Z and W four-axis CNC. In order to meet the needs of customers, a variety of different types of crankshaft oil holes can be processed in one production line. In 2000, the first flexible crankshaft machining center was designed and manufactured, which can process all the oil holes on different crankshafts of 2~12 cylinders. A special deep hole drilling machine developed by MOLLART for the processing of pellet extrusion dies with six spindles and six spindles simultaneously machining six holes on the same workpiece. The number of workpiece holes is up to 36,000. All are controlled by the CNC system.
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