The use and classification of straight-handled twist drill?
The black twist drill is relatively sharp. It is used to drill wood and metal. That is, the silver impact drill bit of woodworking drill is relatively blunt. It is used to drill holes in cement and brick walls, that is, construction drills. When drilling, the electric drill should be adjusted to the impact function.
III. What is the difference between alloy drill bit and twist drill?
Alloy drill bit means that the material of the drill bit is made of carbide, which indicates the material of the drill bit; the twist drill indicates that the shape of the drill bit is as twisted as twist, and she wants to indicate the shape of the drill bit. By the way, most commonly used bits are twisted diamonds, but they are not necessarily alloy.
2. What is the reason for the continuous cutting of twist drilling?
The angle of attack of the drill bit blade does not match the material of the workpiece, and the problem of twist drill cannot be solved (the angle of attack of the edge of the drill bit is not adjustable). For more knowledge of CNC programming, please pay attention to the WeChat official account (CNC programming teaching). When drilling, the drilling chips are constantly related to the nature of the materials drilled. Generally, softer and sticky materials are drilled. When drilling, you will not break the chip by yourself. It is necessary to often raise the drill bit when drilling to clean the drilling debris, so as to prevent the drill bit from being too entangled by the drilling chips and affecting the chip removal.
V. Which corner is the front corner of the twist diamond?
The front angle (i.e. the top angle) of the standard twist drill is 120°±2°. The cross-edged bevel of the standard twist drill is about 50°-55°. The front angle on the cross blade is -50°~-60°. The spiral angle of the standard twist drill is 18°-38°. The front angle is about 30°, and it is about -30° near the cross blade. The back angle α at the outer circle of the twist drill is usually 8°-10°, and the back angle at the cross edge is 20°-25°.
3. What kind of machine tool is processed by twist drill head?
The head of the twist drill is processed by a milling machine. Mahua drill is a tool for machining holes from solid materials, and it is also the most widely used tool in hole machining tools. Twist drilling is a tool for drilling round holes in the workpiece through the rotational cutting of its relative fixed axis. It is named because the chip groove is spiral and looks like twist. Spiral grooves have 2 slots, 3 slots or more slots, but 2 slots are the most common. Mahua drills can be clamped on manual and electric hand twist drilling tools or drilling machines, milling machines, lathes and even machining centers. Drill bit materials are generally high-speed tool steel or cemented carbide.
