Step drill bit
A technology of stepped drill bits and cutting parts, applied in drill repairing, drilling tool accessories, drilling/drilling equipment, etc., can solve problems such as waste of resources, achieve rapid maintenance and replacement, easy and convenient locking and releasing process, and simple structure Effect
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[0035] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0036] Such as figure 1 , figure 2 As shown, a step drill bit includes a clamping part 1, and one end of the clamping part 1 is provided with a first cutting part 2 and a second cutting part 3 in sequence, and the diameter of the first cutting part 2 is larger than that of the second cutting part 3 diameter.
[0037] Such as figure 1 , figure 2 As shown, a pair of cooling flow passages 4 disposed opposite to each other penetrate through the clamping portion 1 , the first cutting portion 2 and the second cutting portion 3 , and the pair of cooling flow passages 4 are arranged in a double helix shape.
[0038]When the above-mentioned drill bit is used, since the diameter of the first cutting part 2 is greater than that of the second cutting part 3, the workpiece can be processed by using the first cutting part 2 and the second cutting part 3, so that a st...
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