Reasonable choice of carbide drill

Carbide drill basic types: solid carbide drill bits, carbide indexable insert carbide drill bit, welding type and replaceable tungsten carbide tooth bit and crown.(Tungsten Carbide Buttons Carbide Teeth Auger Teeth Carbide Tips Suppliers)

Solid carbide drill bits

Suitable for use in advanced machining center. This drill adopts fine grain cemented carbide materials, to extend the service life, also conducted TiAlN coating processing, specially designed blade geometry make drill has the function of self-centering, when most of the artifacts in drilling materials have good control chip and chip removal performance. The bit self-centering function and strictly control the manufacturing precision can ensure that the quality of drilling hole, does not need again for subsequent finishing after drilling. Cemented carbide indexable insert bit for processing a wide range of aperture, the depth of processing range is 2 ~ 5 D D (D for aperture), can be applied to the lathe and other rotating machine. Welded carbide drill

Is solid welding on steel drill made a hard alloy crown. This drill adopts self-centering blade geometry, cutting force is small, for the majority of workpiece material all can achieve good chip control, good surface finish, processing the hole size precision and positioning precision is very high, no longer for subsequent finishing. This drill adopts internal cooling method, can be used in machining center, CNC lathe, or other high rigidity, high speed machine tools. Replaceable tungsten carbide tooth bit crown (Carbide Brazed Tips Carbide Tip)

Is the recent development of a new generation of drilling tool. It is composed of steel and replaceable solid carbide drill body crown, compared with the welding type carbide drill, its machining precision, but due to the crown can be replaced, so can reduce machining cost, raise the productivity of drilling. This drill can obtain accurate aperture increment with the cardiac function, so the aperture processing precision is high. Seco can now offer the three specific geometry blade CrownLoc bit: the first is a conventional passivation edge radius, edge band width and the cone Angle of the universal geometric shape, suitable for most types of steel material machining; The second is to have a wider blade zone and the geometry of the chamfering edge type, suitable for processing of cast iron materials; The third blade geometry can reduce the cutting heat and work hardening, suitable for processing of stainless steel and super alloys. Choosing the carbide drill considerations: when choosing carbide drill machining accuracy, first of all need to consider the size of the drilling machining accuracy requirement. In general, by processing the aperture is smaller, the smaller tolerance also. Therefore, bit manufacturers usually according to the nominal diameter size of the hole processed classify bit. In the above four types of carbide drill, solid carbide drill bit the processing precision of the highest (phi 10 mm whole hard alloy bit of tolerance range of 0 ~ 0.03 mm), so it is the best choice for processing high precision hole; Welding type carbide drill or replaceable tungsten carbide tooth bit crown the tolerance range of 0 ~ 0.07 mm, fit in with the general precision machining; Ann of cemented carbide indexable insert bit is suitable for rough machining, although its processing cost is usually lower than other several drill head, but its machining precision is low, the tolerance range of 0 ~ 0.3 mm (depending on the bit length to diameter ratio), so it is commonly used in the machining accuracy is not high, or by replacing blades complete boring finishing. Machining stability  besides considering drilling accuracy requirement, selecting bit still need to consider the stability of the machine tool. Stability of machine tool for the safety of the bit life and drilling accuracy is important, so you need to carefully check the working state of the machine tool spindle, fixture and accessories. In addition, the stability of the drill itself should also be considered. Solid carbide drill bits, for example, better rigidity, therefore can achieve high machining accuracy. The cemented carbide indexable insert bit of structural stability is poorer, prone to deflection. This bit installed on two pieces of indexable insert, blade used for machining the hole of the central part of the blade is processed from the blade to the outer diameter of the outer part. In only the blade into the cutting processing of initial stage, the bit is in unstable condition, easy to cause drill deflection, and the longer the bit, the greater the amount of deflection. Therefore, in the use of the length more than 4 d of cemented carbide indexable insert bit during drilling process, should be reduced at the beginning of the drilling phase feeding, after entered a stage of stable cutting to increase the feed rate to normal level again. Welding type carbide drill and replaceable tungsten carbide tooth bit crown is composed of two symmetric cutting edge geometry blade can decide from the heart, this cutting edge design to make it with high stability when cut into the workpiece doesn't need to reduce the feed rate, only when the bit tilt installation and cutting except when the workpiece surface with a certain Angle, the proposal at this time in go, when the drill will feed rate decreased by 30% ~ 50%. Due to this kind of drill steel drill can produce tiny deformation, therefore very suitable for lathe processing; And solid carbide drill bits, because of its high brittleness break more easily when used in lathe processing, especially when the bit centering condition is more so. Chip removal and cooling fluid during the processing chip removal is drilling problem that nots allow to ignore. In fact, one of the most serious problems encountered in the drilling process is draining crumbs (especially when the low carbon steel workpieces), and no matter use what kind of drill bit are unable to avoid this problem. Processing workshop often adopt the way of external injection cooling fluid auxiliary chip removal, but this method is only in the deep processing hole under the condition of less than the pore size and reduce the cutting parameters. In addition, it is necessary to choose match the bit diameter, kinds, suitable coolant flow rate and pressure. With no installation cooling system of machine tool spindle, should use coolant ducts. By processing the deeper the hole, the chip is more difficult, need to pressure is, the greater the cooling fluid and shall ensure that bit manufacturers recommended minimum coolant flow, such as coolant flow rate is insufficient, you need to reduce the processing feeding. Each hole machining cost productivity or every hole is the most important factors that affect the drilling cost. In order to improve the productivity, bit manufacturers are committed to the study of machining method can integrate various operating process, to develop and can realize high feed, high speed processing and drilling tools. The latest development of replaceable tungsten carbide tooth bit crown has excellent processing efficiency. Bit wear, the user does not have to change the whole drill, simply replace the hard alloy crown, the purchase cost is only equivalent to welded or overall carbide drills resharpening a fee. Hard alloy crown easy replacement and high repeatability precision, processing workshops available a drill equipped with multiple crown, in processing different aperture size of the hole. Drilling of this modular system can reduce the diameter of 12 ~ 20 mm drill bit of cataloging costs, but also can save the welded or overall carbide drill for resharpening need backup tool costs. When considering every hole processing costs, but also takes into account total bit life. Generally speaking, a solid carbide drill bits only resharpening 7 ~ 10 times, a welding carbide drill resharpening only about 3 ~ 4 times, and replaceable tungsten carbide tooth bit crown when machining steel material, its steel drill replaceable crown at least 20 ~ 30 times. Due to welding or overall carbide drill needs resharpening, to avoid cutting tool breakage, workshop in use when the bit tilt to the using of lower cutting parameters, which affect drilling productivity. And replaceable tungsten carbide tooth bit crown without heavy grinding, workshop can be used when processing the largest feeding and cutting speed and don't have to worry about broken crown. In many cases, due to welding or overall carbide drill after resharpening of cutting edge shape and edge processing status and the new drill head is difficult to perfectly, so its cutting performance and the new bit also exist a certain differences. In addition, such as heavy, mishandling of a cutting edge grinding process can make the edge easy to damage, drilling torque and cutting force and cutting heat increases, which leads to bit shorten service life. The new replaceable tungsten carbide tooth crown the working life of the bit is more stable.(Carbide Shims CNC Inserts)