half round drill bit

Abstract

The invention provides a semi-circular drill bit. The semi-circular drill bit is composed of a handle body and a drill body. The drill body is arranged at one end of the handle body. The handle body and the drill body share the same axis. The drill bit is characterized in that the drill body is of a semi-circular structure; the drill body is provided with a drill tip; the drill tip is arranged onone side of the axis; the drill tip is the highest point of the drill body; a first edge and a second edge are defined with the drill body cutting groove as a boundary; a first central cutting edge angle and a second central cutting edge angle are formed between the drill tip and a drill edge; and accordingly, through the semicircular single-edge design of the drill body, the chip accommodating amount can be increased, the drill tip rotates invisibly for supporting a center while rotating at a high speed, the hole dimensional accuracy is improved, the stability is high, and the rigid structureof the drill tip is strengthened.

Description

technical field [0001] The invention relates to a semicircular drill bit, in particular to a semicircular single-edge feature, which has the maximum chip capacity during cutting, can discharge large continuous iron filings, reduces the friction of iron filings in the aperture, and has a chip capacity The maximum design makes chip removal resistance small, and the drill bit has an eccentric drill point, which can effectively minimize the center static point and minimize the center static point resistance during cutting, so that the hole diameter accuracy of drilling and cutting is high, and the rigidity of the drill point is strengthened Rigid bit structure with central static point to optimize bit life and meet automation needs. Background technique [0002] see figure 1 , figure 2 The main structure of the existing twist drill bit 100 includes a shank 101, a drill body 102 is arranged below the shank 101, and a protruding drill tip 103 is formed at the bottom of the shan...

AI Technical Summary

Problems solved by technology

[0007] However, the above-mentioned multiple blades are not easy to manufacture on the one hand, so that the cost is higher. On the other hand, there is still a drill tip 204 in the center of the drill body 205, which also causes the drill tip resistance F to occur; the rigidity of the drill bit has not been improved. Therefore, the position of the hole machining has not improved, and it is still necessary to slow down the feed rate of the drilling to avoid excessive position deviation, which not only prolongs the processing time, but also causes power loss of the machine tool, increased cost and loss of competitiveness.

[0008] see Figure 1 to Figure 4 As shown, another problem of the existing drill bit is: the iron filings caused by cutting all will be discharged against the chip flute, but the volume of the drill body 102, 205 of the existing drill bit is small, and the iron filings are not easy to discharge, so that the aperture poor wall accuracy

[0009] Another disadvantage of the existing structure is that if figure 2 The marked weakening point 106, all the technology that understands the drill bit structure understands that the drill tip 103, 204 will cause the drill tip resistance F to be generated, in order to reduce the drill tip resistance F, it must be ground at both ends of the drill tip 103, 204 to reduce the size of the drill bit. Tips 103, 204, in actual use, the reduced drill points 103, 204 do have the effect of reducing the drill point resistance F, but the reduced drill points 103, 204 cause insufficient structural strength, and twists will be found after several times of cutting materials The drill point of the drill bit 100 has been brittle, worn out and other problems of insufficient strength have occurred

[0010] From the above two existing drill bits, it can be understood that the existing center drill point structure of the drill bit cannot simultaneously meet the two requirements of minimizing the central static point of the drill tip 103, 204 and maximizing the structural strength of the drill bit

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