Botek deep hole machining tool system

Deep hole processing refers to hole processing in which the aspect ratio (ie, the ratio of the hole depth L to the hole diameter d) is greater than 5-10. Ordinary deep holes (L/d<5~20) can be processed by lengthening or lengthening twist drills. For special deep holes (L/d>20~100), they must be used on special equipment and special deep hole machining machines. Deep hole cutters are machined. In deep hole processing, the hole is semi-closed, and its inherent problems are: chip breaking, chip removal is difficult, thermal conductivity is poor, cooling and lubrication are not easy, and tool rigidity, jitter, vibration, deformation, breakage, etc. may occur. With its strong research and development capabilities and long-term accumulated experience, Botek has developed a more complete tooling system suitable for various processing methods. Including external chipping single and double edge deep hole drilling, spray suction drill, nesting drill, end mill, internal chip removal BTA series, diamond drill with diamond blade and various special shaped deep hole cutters.

Botek's external chipping single- and double-edged deep hole drills (gun drills) are available in 13 models, 7 of which are used for reaming. This type of deep hole drill consists of a cutting part and a drill pipe shank. It has the widest application range. The principle is that high pressure oil is injected from the middle hole of the drill pipe. After the waist hole reaches the cutting zone, the chip is forced to follow the cutting fluid by the V type. The space between the groove and the wall of the workpiece hole is discharged, so it is called external chip removal. Such deep hole drilling flank is generally 0° for ease of manufacture. It has no chisel edge, the drill tip is off-axis, and a small cone is formed in front of the drill tip when drilling, which can cut the chip into two sections at the drill tip, making it easy to discharge. The shape of the cutting portion has an effect on hole tolerance, chip formation, cutting fluid pressure, flow rate, tool life, centerline deviation, and machining quality. Botek has developed a number of different cutting part geometries for different materials.


Botek single-blade gun drill

The cutting portion (nose) of the single-edged outer chip removal deep hole drill forms an outer and inner edge due to the deviation of the drill point from the axis. The outer blade (main cutting edge) is shorter and the inner blade (sub-cutting edge) is longer. The main declination formed by the outer blade is larger than the sub-deflection angle formed by the inner blade, so that the radial force acting on the outer blade is greater than the radial force acting on the inner blade, so that a force acts on the guide bar at all times, so that the guide bar plays Its support guiding function prevents the drill bit from being deflected. The enlarged aperture can produce a rolling effect on the wall of the hole, improve the roundness and the overall processing quality, and can drill the IT7 hole under certain cutting conditions. The configuration of the bars is very important. For deep hole drills with larger diameters, the bars can be mounted. Botek has designed and manufactured a variety of guide bar supports for users to choose from.

Botek single-edged external chip removal deep hole drills are suitable for machining centers and lathes with vertical high-pressure cooling systems and vertical machine tools, tools or workpieces. The minimum diameter of the drill is only 0.7mm. Machining with a minimum amount of lubrication (MQL) can be performed under certain conditions. The single-edged outer chip removal deep hole drill does not have a self-centering function, so a drill sleeve or guide hole is required for machining. The single-edged outer chip removal deep hole drill relies on the guide bar to support the balanced guide, while the double-edged type relies on the symmetrical land.

The Botek double-edged deep hole drill is a double-edged solid carbide type. The double-edged cutting part is a hard alloy type, and the double-edged cutting part is a hard alloy type step drill (the drill rod shank is made of steel).


Botek double-edged gun drill

The inner chip of the deep-drilling deep-drilling deep-drilling drill bit (cutting part) and the drill pipe are generally composed of a threaded connection. During operation, the high-pressure cutting oil is injected from the gap between the outer diameter of the drill pipe and the wall of the workpiece hole, and the chip is cut along with the chip. The liquid is discharged from the center of the drill pipe. The internal chip removal system deep hole drilling Botek is called BTA system, and each factory also uses this name. The Botek internal chip removal system also includes a pull tool.

Botek's squirting drill uses the jetting effect of the cutting liquid to discharge the chips. Generally, there are two inner and outer tubes in the center. About 2/3 of the cutting fluid flows into the cutting area from the gap between the inner and outer tubes and the hole at the front of the drill bit. The guiding part is cooled and lubricated, and then the cutting chips are discharged from the inner tube; in addition, about 1/3 of the cutting fluid is sprayed backward from the crescent-shaped narrow slit nozzle around the inner tube, because the nozzle slit is narrow and the flow velocity is fast, resulting in The jet effect forms a low pressure zone around the inside, and a pressure difference is formed before and after the inner tube to generate a suction force to the front section, so that the flow of the cutting fluid is stable, the chip discharge is good, and the drilling efficiency can be improved. In addition to the internal and external double tubes, the single tube type is composed of a dedicated nozzle and a branching device.


Botek can transpose BTA system

Botek's nesting drills cut the material intermediate core, leaving it for reuse, reducing chipping and increasing productivity.

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