Twist drill with grooved front tool faces and bent blades

Abstract

The invention discloses a twist drill. The twist drill is characterized in that main blades of the twist drill are bent blades, in other words, a plurality of spiral grooves are formed in spiral surfaces of front tool faces of the main blades, projection of each spiral groove on an end plane of the twist drill is a curve or a fold line which is used as a generating line, and the spiral grooves spirally move around a drill spindle from the generating lines. The invention further discloses application of the twist drill to drilling machining. The twist drill and the application have the advantages that the twist drill is excellent in comprehensive drilling performance, holes can be drilled and machined within a short time, the twist drill is low in drilling power consumption and high in tool durability, and a tool sharpening method is simple and convenient and is easy to implement.

Description

technical field [0001] The present invention relates to the technical field of cutting tools, in particular to a twist drill. Background technique [0002] Twist drill is a general-purpose tool for drilling holes in solid workpieces, commonly known as drill bits. Twist drills widely used in manufacturing companies are standard twist drills (billions of them are produced in my country every year), which have the following structural features: 1) The main edge is a straight line; 2) The rake face of the main edge is a straight line, which is formed by a spiral motion 3) The flank surface is a conical surface. The reason why the standard twist drill is widely used is that it has many advantages, the most important of which are the simple sharpening method and stable and reliable centering. However, the standard twist drill also has obvious defects, mainly in: 1) The distribution of cutting angle is very unreasonable, the rake angle of each point of the main edge changes too mu...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by this invention is to overcome the improved twist drill obtained by optimizing the flank sharpening structure of group drills and the like because the sharpening structure and sharpening method are complicated and difficult to popularize, and the standard twist drill sharpening method is simple but difficult to drill. In view of the defects of poor cutting performance and energy-saving effect, a curved-edged twist drill with grooves on the rake face is proposed, which has good comprehensive drilling performance and can be used in a shorter period of time with lower drilling power consumption and more High tool durability completes the drilling process of the hole, and the sharpening method is simple and easy, and the drilling accuracy is improved

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