Generally, a hole with a hole depth to hole ratio greater than 10 is called deep hole drilling. Due to the large length and long diameter, the use of general twist drills for drilling, chip removal, cooling, lubrication and guiding becomes an intractable problem, and the quality requirements of the holes are difficult to achieve. Based on the rich experience of 100 years of professional production of hole machining tools and the professional gun drill manufacturing in the field of deep hole machining for more than 20 years, Germany Cobalt Neck Tool Co., Ltd. has developed the following series of gun drills with leading technology in deep hole machining:
EB100 single-blade solid carbide gun drill: Processing range: Ф1.2-5.0mm, maximum groove length 300mm, almost suitable for all material processing.
EB80 single-blade hard alloy cutter head gun drill: processing range: Ф 2-40mm, total length up to 3000mm, almost suitable for all material processing.
ZB80 double-edged hard alloy cutter head gun drill: processing range: Ф6-27mm, total length up to 1000mm, suitable for processing non-metallic materials such as cast iron, aluminum and short iron filings.
First, the working principle of the gun drill When the gun is working, the coolant is sent to the cutting part through the drill pipe through the circulating cooling system to cool and lubricate the tool, and rely on the pressure of the coolant to remove the chips from the inner wall of the hole. The "V" groove on the drill pipe is discharged. During operation, the gun drill can be rotated by the machine tool spindle, or the gun drill can be fixed and the workpiece can be rotated. The shape tolerance of the hole machined when the workpiece rotates is better.
Second, the structure of the gun drill The gun drill consists of three parts: the drill tip, the drill pipe and the handle.
The drill tip part is the most important part of the gun drill. It is responsible for the important drilling work. In order to ensure the precision of the hole to be machined, a guide block is designed in its circumferential part, and it is fed once under the guidance of the guide hole. It is possible to machine high-precision holes. The shape of the drill tip structure is available in a variety of types depending on the processing conditions. The drill tip material is made of Cobalt's own high-quality DK460UF ultra-fine grained carbide and coated with TiN, FIRE or MolyGlide coating. It has very high hardness and toughness, which greatly improves the drill of the gun drill. Cutting performance and service life.
The drill pipe drill pipe is usually designed in a “V†shape with an outer diameter slightly smaller than the drill tip. Under the premise of ensuring sufficient strength and rigidity of the drill pipe, the coolant hole and the chip removal space of the drill pipe are maximized as much as possible. Conducive to the cooling, lubrication and chip evacuation of the drill tip. The EB100 series drill pipe is made of cemented carbide with a drill tip. The EB80 and ZB80 series drill pipes are rolled from high-grade seamless steel tubes.
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