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Small-diameter deep hole machining In addition to traditional twist drills and gun drills, cemented carbide deep-hole drills are increasingly used. Double-edged cutting edges, high-performance coatings, and drill tips optimized for different materials combine to achieve higher processing efficiency. After the drill bit is worn out, the machining cost can be reduced by continuous regrinding and heavy coating. An important feature of cemented carbide deep-hole drills is the need for four support lands, which ensure good support and straightness after drilling the necessary guide holes. Komet's DrillmaxXL Carbide Deep Hole Drills are available in standard sizes of 20/30*D and deep hole drills for aluminium alloys up to 40*D deep. When used in the inclined oil passage hole of the crankshaft (38MnVs6), the high machining speed of F=850mm/min can reach the life of more than 3800 holes.
Many customers in the deep-hole machining of medium and large bore diameters have directly crossed from the use of twist drills or welded alloy drills to the use of Highmite Centron Series deep hole drills, which has greatly improved productivity. Ordinary blade bit is limited by the limitations of the steel body drill pipe and the structure, usually can not exceed the limit of 5*D (five times the diameter of the depth), while the large diameter gun drill is not common, or does not have special equipment. Gombert's Centron deep hole drill installed a center drill at the center of the drill's front end, slightly higher than the blades on both sides. In this way, after cutting into the workpiece, the center drill can be used as a guide and support to prevent vibration and drilling deviation. At the same time, the blades on both sides closely follow the diameter of the hole we need. The structure of the seat can also provide a certain range of diameter adjustment. In this way, we have increased the machining depth to 12*D. This is a simple and effective structure, but it is indeed the application and improvement that has been continuously applied in deep hole processing for many years.
In the deep hole machining with medium hole diameter, we matched this tool head with a drill pipe with a spiral groove, just like the spiral groove of a twist drill, even if chip evacuation is not a problem during vertical machining. And there are many different types of grooved and coated inserts as options, especially for a variety of chipbreaker type, which can effectively break chips when processing non-alloy steel. Taking a Ø50 Centron deep hole drilling 42CrMo4 as an example, up to 180m/min Vc (line speed) and 0.14mm/rev f (feed per revolution) can get a total feed of F = 160mm/min, while the twist The drill is only about 80mm/min, even if the twist drill feeds up to 0.5mm/rev per revolution. At the same time, this kind of bit is very much concerned with the stability of the machining. There is a special support block on the back side of the cutter head, which can smoothly pass through even if it encounters through holes or non-planar exits. This feature has attracted many customers from industries such as energy, ship fire, and heavy industry.
In order to further pursue efficient processing, we have introduced a new double-edged deep hole drill named CentronPowerline. The blades on both sides of the traditional Centron are not symmetrical and can only be considered as an effective cutting edge. The Powerline is a symmetrical cutting edge. A simple result is a doubling of the feed rate. At the same time, when the diameter is greater than Ø40, the misalignment of the blades on both sides can further improve the chip breaking performance. On slewing bearings and tube plates that require a lot of drilling, more and faster drilling can be done.
In the case of deep-hole machining with large diameter holes, unless there is a strong and powerful boring machine, it will be slowly expanded after drilling the bottom hole. If the machine power and torque of the customer's processing equipment allow, we can help the customer drill directly from the physical to the Ø300, in China we have achieved Ø260.
Gomite Group has been known as a hole processing specialist from Germany. Through continuous expansion, we have more than a dozen drill bit series to adapt to different working conditions and processing requirements. Whether it is shallow hole or deep hole machining, whether it is the stability or the cost, we are always ready to provide you with a better drill.
How to achieve efficient deep hole machining in machining centers and boring machines
When facing the challenge of deep hole processing, not all customers can use dedicated deep hole processing equipment. Therefore, how to achieve efficient deep hole machining in machining centers and boring machines becomes a problem that needs to be frequently faced. If we simply distinguish between small-diameter, medium-diameter, and large-diameter deep-hole machining, we can provide high-efficiency tools that satisfy our customers.