Chinese 
English
Gun drilling represents a advanced and high effective hole drilling technology. Not only used for drilling deep hole(length and diameter ratio >10), but also for drilling precise shallow hole. Gun drill is main tool for gun drilling. It is welded drill shank, drill stem and drill tip together, with a through-hole by which the cutting liquid enters cutting area.
Gun Drill Tip
Gun drill tip of carbide alloy material is the key part. The unique and scientific structure ensures self-guide drilling and reaching a deep hole of high-precision(IT6~IT11), fine straightness(0.16~0.33mm/1000mm) and low roughness(Ra6.3~Ra0.1) through one-time drilling. The drill tip contains two basic angles, external angle and internal angle(refers to gun drill's grinding angle). According to workpiece's material and drilling diameter, choosing the best combination of angles for better balance of cutting force and breaking of chips, and transmit the cutting force to supporting shoulder to guarantee better straightness and coaxiality. There's small back taper on drill tip, the diameter is bigger than drill stem, which makes drill stem freely rotates inside drilling hole without rubbing against inner wall of drilling hole.
Gun Drill Stem
The material is carbide alloy and processed by rolling, heat treatment and alignment, etc. The drill stem contains "V" shape groove of 118~120°for the convenience of chip removing. To guarantee reaching fine straightness and skewness, the drill stem's intensity should be enough to provide enough torque under small torsional deformation. Simultaneously, to absorb vibration caused by high speed rotary, the gun drill needs better tenacity.
Above all, for manufacturing, choice of gun drill's material, heat treatment and rolling process ,etc. is very important.
Gun Drill Shank
The torque is transmitted between dill tip and machine bed and the oil is sealed by drill shank. High rotary accuracy between drill stem and drill shank can avoid extra vibration to promote processing precision and reliability. A smooth curve groove exists in the joint part of drill stem and drill shank to protect gun drill from damage caused by stress concentration.
If any more question, please feel free to contact us.
Email: gsmsxoffice@gmail.com
