Brief history of drilling machine development
Drilling machine refers to the machine tool that mainly uses the drill to process holes on the workpiece. Generally, the rotation of the bit is the main motion, and the axial movement of the bit is the feed motion. The structure of the drilling machine is simple, and the machining accuracy is relatively low. It can drill through holes and blind holes, replace special tools, expand, countersink, ream or tap. In the process of machining, the workpiece does not move, the tool moves, the center of the tool is aligned with the center of the hole, and the tool rotates (main motion). The characteristic of drilling machine is that the workpiece is fixed and the cutter rotates.
In the early 1970s, drilling machine was controlled by common relay in the world. For example, the mega50 of Eldorado company in the United States, the t30-3-250 of TBT company in Germany, the b4-h30-c / L of Nagel company, and the DEG type drilling machines of shinzaki advanced precision manufacturing Institute in Japan, which entered China in the 1970s and 1980s, are all controlled by relays. In the late 1980s, due to the emergence of numerical control technology, it gradually began to be applied in deep hole drilling machine, especially after 90 years, this advanced technology was promoted. For example, the ML series deep hole drilling machine listed by TBT company in the early 1990s, except that the feeding system is changed from mechanical continuously variable transmission to AC servo motor driven ball screw pair, and the sliding table guide for feeding adopts rolling linear guide rail, the drill pipe box drive is changed from stepless variable speed drive to stepless variable frequency drive in order to ensure high-speed rotation and stable precision Motor to motorized spindle drive creates favorable conditions for drilling small hole and deep hole drilling machine and improving the horizontal quality of deep hole drilling machine.
In order to process oblique holes, vertical holes or parallel holes on some parts which cross each other or at any angle, or form a certain angle with the center line of the parts, various countries have specially developed a variety of special deep hole drilling machines. For example, the special purpose is to process the oil hole on the crankshaft, the inclined oil hole on the connecting rod, the parallel hole and the multiple radial discharge holes of the feeding die of the feed machine. Bw250-kw deep hole drilling machine is especially suitable for crankshaft oil hole of large and medium trucks. They all have X, y, Z, w four axis CNC. In order to meet the needs of customers, a variety 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 with six equal parts and six spindles for processing six holes on the same workpiece is developed by mollart company. The number of holes is up to 36000. It's all controlled by the numerical control system.
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