On the composition of gun drill

According to the manufacturer of deep hole gun drill, the gun drill can be used not only to process deep holes (height diameter > 10), but also to process high-precision shallow holes. Gun drill is generally welded together by electric welding of drill handle, drill pipe and drill bit. There is a through hole in the middle of the gun drill, which is a safe channel for cutting oil to enter the drilling area. The drill bit is the core part of all gun drills. The raw material is cemented carbide cutter. Its unique matching structure of scientific research ensures that it also has the effect of self directivity during drilling, and can obtain a high-precision shallow hole according to one round.

The drill bit has two basic angles: external angle and internal angle (refer to gun drill grinding angle). The most appropriate composition can be selected according to the raw materials and diameter of the workpiece to be drilled, so as to balance the cutting speed and breaking faster in the work, and transmit the cutting speed to the shoulder of the support point to ensure better perpendicularity and parallelism.

The drill bit has a smaller inverted cone and a slightly larger diameter than the boring cutter. It can ensure that the drill pipe rotates freely in the drilling hole and is not easy to rub the inner wall of the hole.

The drill pipe is made of high-quality alloy steel through cold rolling, heat treatment, straightening and other processes. The drill pipe is rolled with a "V" groove of 118 ° ~ 120 ° for chip removal. In order to ensure the verticality and inclination of the drilling hole, the drill pipe must have sufficient compressive strength to give the torsional torque required for drilling under small torsional deformation. At the same time, the blade must have sufficient ductility, so that it can digest and absorb the vibration caused by the high-speed operation of the blade. Therefore, the material selection, heat treatment and cold rolling process standards of drill pipe are very harsh. The drill handle transmits torque between the NC lathe and the drill bit, with high sealing and high pressure oil. The high rotation accuracy between the drill handle and the drill pipe can prevent additional vibration and improve the machining accuracy and stability. A smooth arc-shaped concave groove for removing pressure is arranged at the head and neck where the drill handle is connected with the boring cutter to prevent damage due to stress.

The gun drill is processed into forced chip removal. The high-pressure cutting fluid enters the internal thread of gun drill from the drill handle, reaches the drilling area, and carries out refrigeration and lubrication on the drilling edge. The iron pin and cutting fluid are discharged along the "V" groove of the drill pipe. Also known as discharge debris. Gun drill processing has a wide range of material standards. From glass fiber, Teflon and other plastics to carbon steel, carbon steel, rare metals to high toughness carbon steel (such as high-temperature heat-resistant alloy and aluminum alloy), deep hole processing can be carried out. Due to its extraordinary hole processing characteristics, gun drill is widely used in shipbuilding, vehicles, automobile engines, electric locomotives, military, machinery manufacturing, fuel injectors, gasoline pumps, mining equipment and hydraulic accessories.