Each drill bit for metal hole alloy processing costs

Each hole machining productivity or cost is the most important factor in drilling impact. To improve productivity, the carbide drill bits manufacturers are working on a variety of operations can be integrated step processing method, and developing high feed, high speed processing of the drilling tool. The newly developed replaceable carbide drill crown has excellent machining economy. Carbide crown replacement easy and high repeatability, processing workshops available drill body with a plurality of teeth crowns, to the processing of different pore sizes of holes. This modular drilling system can reduce 12 ~ 20mm diameter drill bit manufacturing costs and administrative expenses, while also saving the cost of backup tool when welding or solid carbide drills were reground needed. When considering the cost of processing each hole, should also be taken into account the total life of the core drill bit. In general, a solid carbide drill regrinding only 7 to 10 times, a welded carbide drill regrinding only 3 to 4 times, and replaceable carbide drill crown in the processing of steel material , its steel hammer drill bits body can be replaced at least 20 to 30 times the tooth crown.

Alloy drill bit for metal chip and coolant

Chip is drill bits for metal for metaling in question can not be ignored. In fact, the drill bit for metaling encountered the most problems is poor chip (especially when machining low carbon steel workpiece), and regardless of the drill bit for metal were unable to avoid this problem. Processing plant are often used way of external coolant injection auxiliary chip, but this method only if the workpiece hole diameter and decrease the cutting depth is less than the case of the parameter is valid. In addition, you must use the hss drill bit for metal diameter to match the right kind of coolant flow and pressure. For the spindle cooling system is not installed in the machine, you should use a coolant pipe. The deeper the hole to be machined, the more difficult chip removal, the coolant pressure greater need, therefore be guaranteed bit manufacturer's recommended minimum coolant flow, such as drill bit lack of coolant flow, it is necessary to reduce the machining feedrate.

Features and choice of solid carbide drills

Solid carbide drill bits is a complete carbide rods, use grinder processing. High strength, high hardness properties, fast cutting speed, wear resistance, red hardness and good, suitable for processing a variety of materials components. By cooling structure can be divided into non-cooling holes and there are two types of cooling holes. 1. Characteristics and uses (1) rigid, high strength, easy access to high precision core drill bit. (2) the material can be suitable for more complex drilling, selects a higher cutting speed. (3) effective to reduce chipping, has good wear resistance. (4) multi-layer geometry cutting tip edge, improving chip performance, maintain a smaller cutting resistance. (5) In addition to commonly used rectangular handle, the wide range of handles, suitable for a variety of drills, drilling machines equipped with. (6) compared with indexable insert drills, solid carbide hammer drill bits grinding times can be 7-10 times.

Processing stability of drill bits

In addition to considering drill biting accuracy requirements, the need to consider the stability of the machine tool when selecting Non-core drill bit. Machine stability is essential for safe life and precision drill bit bit, and therefore need to carefully examine the machine spindle, fixture and accessory working condition. Also, consider the stability of the drill bit itself. Solid carbide drill bits best rigidity and therefore can achieve high precision. The poor structural stability carbide indexable insert masonry drill bit, and prone to deflection. Welded carbide drill bits and replaceable carbide drill bit crown is composed by two symmetrical self-centering cutting edge geometry of edge, which has a high stability of the cutting edge of design when it does not need to cut into the workpiece reduce the feed rate, and only when the drill bit bit inclined mounting surface and cut into a certain inclination exception, this time recommended drill bit, drill bit when the feed rate is reduced from 30% to 50%. Because these drill bit steel sds plus hammer drill bits body can produce small deformation, and therefore well suited for lathe; but due to the large brittle solid carbide drill bits, when used in lathe easier to break, especially when the poor condition of the drill bit centering when even more so.

Selection of carbide drill bit considerations

use carbide drill, the first need to consider the size of precision drilling. In general, the smaller the aperture to be processed, its tolerance is smaller. Therefore, manufacturers usually arix core drill bit holes to be processed according to the nominal diameter of the drill bit for classification. In the above four types of carbide drill, solid carbide drill highest precision (φ10mm solid carbide drills tolerance for 0 ~ 0.03mm), so it is the best choice for high-precision machining holes; welded carbide drill or replaceable carbide drill crown tolerance range is 0 ~ 0.07mm, generally more suitable for hole machining accuracy requirements; installation carbide indexable insert carbide drill bits are more suitable for heavy roughing, Although its processing cost is typically lower than the other several bits, but its precision is relatively low, the tolerance range is 0 ~ 0.3mm (depending on the bit aspect ratio), it is generally used for hole machining accuracy is not required , or require subsequent finishing hole.

The classification of carbide drill bit

Carbide indexable insert drills: Install carbide drill bits indexable insert drills processing aperture range is very wide, processing depth range of 2D ~ 5D (D for diameter) can be used lathes and other rotating machines. Welded carbide drill: welded carbide steel drill bit is firmly welded body made of a hard metal crown. This self-centering drill blade geometry type, small cutting force, for most workpiece materials can achieve good chip control, machined hole surface finish, dimensional accuracy and positioning accuracy are high, do not have to follow-up fine processing. The electroplated core drill bit uses internal cooling method can be used for machining centers, CNC lathes or other high rigidity, high speed machine. Replaceable carbide drill crowns: the crown replaceable carbide drill bit in recent years to develop a new generation of drilling tools. It consists of solid carbide steel drill body and replaceable crown combination, compared with welded carbide drill, the machining accuracy comparable, but the crown can be replaced, thus reducing processing costs, improve drilling productivity. This drill bit hole size to get an accurate incremental and self-centering function, so high precision aperture.

The basic types of carbide drill

    Carbide drill bit into four basic types: solid carbide drills, carbide indexable insert drills, welding and replaceable carbide carbide drill bit crown. Solid carbide drills: Solid carbide core drilling bits suitable for use in advanced machining center. This drill carbide materials manufactured using fine particles, in order to extend the service life, also conducted coating, blade geometry type specially designed drill bit with a self-centering function, good chips when drilling most workpiece materials control and chip evacuation. Self-centering function of the drill and manufacturing precision strict quality control to ensure that the hole drilling, carbide drill bits without further follow-up after finishing.

The application of drill bits

Product performance continue to improve over the past few years, the quality and type of the cutting teeth have undergone tremendous changes. If the 1980s and today's tooth, then the teeth were compared, the difference is quite large. Due to changes in the mixing process and the manufacturing process, the quality of the performance of today's cutting teeth is much better, so that the anti-erosion and impact diamond core drill bit capabilities are greatly improved.

Engineers also tungsten carbide interface between the substrate and the synthetic diamond is optimized to improve the toughness of the cutting teeth. Layered diamond workmanship innovation has also been used to improve the abrasion resistance and thermal stability.

In addition to the development of materials and manufacturing processes, product design techniques in the tooth and the tooth cloth has also achieved a major breakthrough. Products can be used in areas not previously applied, such as harder, more abrasive formations and varied. This extended to the new field, to balance between the drill bits and the roller cone diamond core drill machine diamond (fixed cutter) had a great impact occurs.

Initially, the drill bits can only be used for soft shale formations, because it will damage the drill bits hard mezzanine. However, due to the emergence of new technologies and changes in the structure of the drill bits can be used in hard rock formations have been Non-core drill bit hard and long segments of the mezzanine. drill bits is increasingly chosen by the people, especially with the cutter quality continues to improve, this situation more and more prominent.