deep hole drill bitThe number of applications is increasing. The market is said to develop and expand much faster than in previous years. And most of the mold steel industry needs to apply deep hole drill bits, which is also very productive. Because of the high quality requirements, customers have high quality requirements. Naturally, the industry quality of these deep hole drill bits must be in place, which will have an impact on the reputation and economy of the manufacturers.

In the working process of the deep hole drill, the chip has a large plastic deformation on the shear surface. At the same time, the pressure on the rake face exerts a bending moment on the chip, forcing the chip to bend. When cutting at high speed, the pressure of the rake face of the deep hole drill is large enough. The rake face is bonded to the bottom of the chip, and because the cutting process is continuous, the metal at the bottom of the chip is constantly stretching and sliding, as if the wave pushes the wave in front of it, it is not compressed, causing Cheney to bend. The chips are curved along the arcuate surface of the chip breaker. When the free end of the deep hole drill may collide with the surface of the hole, the drill or the workpiece to be machined, the chip will be subjected to bending moment or torque and break. Chip removal speed, suitable for high-speed cutting. In the entire length of the chip groove, the diameter of the drill bit is inverted cone, the friction with the hole wall is small when drilling, and the drilling quality is high. Common drill shank diameters are 3.00mm and 3.175mm.

　　deep hole drill bitIn order to improve the performance of cemented carbide, some use chemical vapor deposition of a layer of 5 to 7 microns of ultra-hard titanium carbide (TIC) or titanium nitride (TIN) on the cemented carbide substrate to make it have higher hardness. The reasons for the larger hole diameter in the deep hole drill bit of the mold are: the planned value of the reamer outer diameter is too large or the cutting edge of the hinge has burrs; The cutting speed is too high; Improper feed or excessive machining allowance; The main deflection angle of the reamer is too large, and the reamer twists and turns; The chip tumor is attached to the cutting edge of the hinge. When grinding, the swing error of the hinge cutting edge is out.

When the deep hole drill is installed, the oil on the surface of the taper shank is not cleaned or the taper surface is scratched; the taper shank is tapered after the flat tail of the taper shank is offset to the main shaft of the machine tool; the spindle is twisted or the spindle bearing is too loose or damaged; the reamer is not flexible; manual reaming is different from the workpiece axis line, and the force on both hands is uneven, causing the reamer to swing from side to side. Molddeep hole drill bitWhen the aperture becomes larger, the treatment method is to reduce the outer diameter of the reamer appropriately according to the specific situation. Reduce the cutting speed and adjust the feed or cutting allowance appropriately; Appropriately reduce the main deflection angle, straighten or scrap the useless reamer. Carefully trim with oilstone until it is qualified; control the swing difference within the promised range; select cutting fluid with good cooling performance; before installing the reamer, it is necessary to wipe the oil stains inside the reamer taper shank and the taper hole of the machine tool spindle, and polish the protrusions on the cone surface with oilstone; adjust the flat tail of the reamer or replace the spindle bearing; adjust the floating chuck from beginning to end and adjust the coaxiality; pay attention to correct operation.

The above isdeep hole drill bitRelated knowledge is introduced.