In the early 70s of the 20th century, drilling machines were still controlled by ordinary relays in the world. For example, in the 70s and 80s, the MEGA50 of ELDORADO of the United States, the T30-3-250 of TBT of Germany, the B4-H30-C/L of NAGEL, and the DEG type of Kanzaki Advanced Seiko Manufacturing Co., Ltd. of Japan are all controlled by relays. In the late 80s, due to the emergence of numerical control technology, it gradually began to be applied in deep hole drilling machines, especially after 90 years, this advanced technology was promoted. For example, in addition to the feed system of the ML series deep hole drilling machine listed in the early 90s of TBT company, the feed system was changed from a mechanical continuously variable transmission to an AC servo motor to drive the ball screw pair, and the guide rail of the feed slide table was driven by a rolling linear guide rail, in order to ensure high-speed rotation and stable accuracy, the drill pipe box transmission was changed from the exchange of pulleys and belts, and the stepwise transmission driven by the two-speed motor to the stepless speed conversion motor to the electric spindle drive, which created favorable conditions for drilling small hole deep hole drilling machine and improving the level quality of deep hole drilling machine.
In order to process the needs of intersecting or arbitrary angles on some parts, or oblique holes, vertical holes or parallel holes at a certain angle with the center line of the machined parts, various countries have specially developed a variety of special deep hole drilling machines. For example, it is specially designed for processing oil holes on crankshafts, inclined oil holes on connecting rods, parallel holes and multiple radial discharge holes in feed machinery loading dies. The BW250-KW deep hole drilling machine is especially suitable for large and medium-sized truck crankshaft oil holes, and they all have X, Y, Z, W four-axis numerical control. In order to meet the needs of customers, a variety of different varieties of crankshaft oil holes can be processed on one production line, and the first flexible crankshaft machining center was designed and manufactured in 2000, which can process all the oil holes on different crankshafts of 2~12 cylinders. MOLLART manufactures a special deep-hole drilling machine with six spindles in six equal parts and six spindles for the simultaneous processing of six holes in the same workpiece. The number of holes in this workpiece is up to 36,000. All are controlled by the CNC system.
