[Q] The use and classification of straight-handled twist drills?
[A] The black twist drill is relatively sharp. It is used to drill wood and metal, that is, the silver impact drill bit of the woodworking drill is more dull, which is used to drill holes in cement and brick walls, that is, construction drilling. When drilling, the electric drill should be adjusted to the impact function.
[Q] What is the difference between an alloy drill bit and a twist drill?
[Q] The alloy drill bit refers to the bit material made of cemented carbide (such as alloy steel containing tungsten), which indicates the material of the drill bit; the twisted drill bit shows that the shape of the drill bit is twisted like twisted, and she wants to indicate the shape of the drill bit. By the way, most commonly used drill bits are twist drills, but they are not necessarily alloy.
[Q] Why does twist keep cutting when drilling holes?
[A] The angle of the edge of the drill bit does not match the material of the workpiece. The problem of twist drilling cannot be solved (the angle of the edge of the twist drill bit cannot be adjusted). When drilling, the drill chips are constantly related to the nature of the material drilled. Generally, softer and sticky materials will not break the chips by themselves when drilling holes, and the drill bit needs to be carried frequently when drilling. Come out to clean up the drill crumbs to prevent the drill bit from being overwounded and affecting the debris removal.
[Q] Which corner is the front corner of the twist diamond?
[Answer] The front angle (i.e. the top angle) of the standard twist drill is 120°±2°. The cross-edge bevel of the standard twist drill is about 50°~55°. The front angle on the cross-edge is -50°~-60°. The spiral angle of the standard twist drill is about 30° at the tip of 18°~38°, and about -30° near the cross-edge. 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°.
[Q] What machine tool is processed for the head of the twist drill?
[Answer] The head of the twist drill is processed by the 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. The twist drill is a tool for drilling the round holes of the workpiece through the rotary cutting of its relative fixed axis. It is named because the chip groove is spiral and shaped like a twist. Spiral slots have 2 slots, 3 or more slots, but 2 slots are the most common. Hemp drills can be clamped on manual and electric hands, twist drilling tools or drilling machines, milling machines, lathes and even machining centers. The drill bit material is generally high-speed tool steel or cemented carbide.
