Tinghua drill is a tool for drilling workpiece through the rotation cutting of a relatively fixed axis.It is named because it is spiral -shaped and looks like twist.The spiral grooves have 2 slots, 3 slots, or more slots, but the two slots are the most common.Twist drilling can be used in manual and electric hand -held drilling tools or drilling tools, milling machines, lathes and even machining centers.Drilling materials are generally high -speed tool steel or hard alloys.
Twist drill price
There are many specifications of twist drills, and different specifications are different.The price is generally ranging from 1-3 yuan.
Terrace of Twist Diamond
When grinding the drill bit, if the cutting edge of the drill head is facing the axis line of the wheel, the front part of the drill head is holding the front of the drill with the back of the drill.The right hand was fixed, and the tail of the drill head was swinging to the lower left.During the entire grinding drill head, the drilling tail must not be higher than the axis of the wheel, otherwise the drill is not moving.The force when the drilling bits should be from small to large, that is, when the cutting blade is grinded back, the power is used from small to large.When grinding drills, the top angle of the two cut blades must be symmetrical, generally about 118 °.After the cutting blade on one side, keep the posture unchanged, rotate the drill 180 °, and then grind the cut blade on the other side.If you want a round drill, you can sharpen the top angle, that is, a point, so that the drill is better when drilling, and the hole is more light.The two cut blades should be as long as possible. The angle of the two blades should be symmetrical.The rear angle of the cutting blade is generally between 8 and 12 °. Do not grind the cutting blade lower than the rear angle, so that the drilling bit cannot be drilled.In addition, the horizontal blade of the drill bit should be narrowed, so that the drill bit can save a lot of effort when the drill head is drilled down.
Tinghua Diamond Bottom
The smallest specifications of twist drills are 3.5mm diameter, and there are various specifications such as 5, 6, 8, 10, 12, 14, 16, 18, 20, 22, and 32.
Twist drill header
It is suitable for the processing surface treatment of steel casting steel, alloy and non -alloy steel, gray cymbal cast iron, forged cast iron, and the processing surface treatment of graphite and graphite.

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