The “gun drill†is also called deep hole drill, which represents advanced and efficient hole processing technology. It can be used not only to machine deep holes (path to length ratio 1:250), but also to machine shallow holes (diameter to length ratio 1:1). Introduction "Gun drill" is also called deep hole drill, which represents advanced and efficient hole processing technology. It can be used not only to machine deep holes (path to length ratio 1:250), but also to machine shallow holes (diameter to length ratio 1:1). It is welded together by three parts: drill shank, drill pipe and drill bit. There is a through hole in the middle, which is suitable for drilling cast iron, carbon steel, copper, aluminum alloy and alloy steel. The drill drill will complete the drilling, boring and reaming at one time, and the high precision (IT6-8 grade), precision straightness (0.16-0.33mm/1000mm) and low roughness (Ra3.2-) can be processed in one pass. Ra 0.1) hole. Its drilling speed reaches 30-100 m / min or more. At present, it is widely used in shipbuilding, automobiles, engines, locomotives, chemical machinery, nozzle oil pumps, mining machinery and hydraulic parts.
Instructions for use
1. When using, you must first select the guide sleeve of the appropriate size. The gap between the guide sleeve and the gun bit should be kept within 0.003mm--0.008mm. The machine tool spindle with gun drill must have high axial and radial. Rigid, the guide sleeve and the main shaft have a high degree of concentricity. During the drilling process, the material to be processed (especially the casting) should be drilled without cracks, pores and other impurities, otherwise it will cause chipping or even turning around. The amount of cutting should be correctly selected when using. In general, the cutting speed is V=1.1-1.65 m/s, the feed rate is s=0.015-0.03 mm/rev, the oil pressure is P=2.5-6.0 Mpa, and the flow rate is Q=0.2-0.65 liter/second.
2, the cutting fluid used in the gun drill is more stressful, it directly affects the accuracy of the hole being machined. Be sure to choose a dedicated gun drill. Generally, the cutting fluid for gun drilling should have extreme pressure additives to ensure the formation of oil film under high pressure to prevent dry grinding. The viscosity of the cutting fluid is related to the diameter of the borehole. The smaller the diameter, the lower the viscosity. Compared with general machining, the cutting oil sent to the cutting area of ​​the gun drill has the characteristics of high pressure, large flow and high filtration precision. The flow rate should increase with the increase of the hole depth to ensure that the cutting oil has a larger flow rate and achieve the purpose of smooth chip removal.
Re-grinding method After the gun drill wears, it needs timely and correct sharpening. When sharpening, the gun drill must be mounted on a special jig on a universal cutting tool or a special sharpening machine for sharpening. A resin diamond wheel with a particle size of about 120 can be selected. For sharpening, each sharpening only grinds the back face of the inner and outer corners. The correct geometry and tip position must be guaranteed.
Technical Parameters
1. The diameter and tolerance of the gun bit (or the hole diameter and tolerance to be machined), the blade diameter d, the total length L and the handle size.
2. The shape and size of the material to be processed and the handle of the gun.
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