A high hardness, high toughness machining insert for difficult-to-cut materials

Abstract

The invention discloses a high-hardness, high-toughness and hard-cutting material machining blade and belongs to the metal cutting tool technical field. The high-hardness, high-toughness and hard-cutting material machining blade of the invention includes a front angle gamma o from 0 to -5 degrees, a rear angel alpha o from 5 to 8 degrees, and a tool cutting edge angle Kr from 84 to 87 degrees; the front blade surface of the blade is provided with a parallel type main chip breaking groove; and a blade tip formed by a main cutting edge and an auxiliary cutting edge of the main chip breaking groove is axially provided with an auxiliary chip breaking groove composed of an auxiliary front angle gamma o from -3 to -7 degrees, the length of the auxiliary front angle gamma o ranging from 1 to 2 mm. According to the blade of the invention, based on material machining characteristics of high-hardness, high-toughness and hard-cutting materials, the front angle gamma o, the rear angel alpha o and the tool cutting edge angle Kr of the blade are reasonably set, and therefore, the strength, wear resistance and sharpness of the cutting edge of the blade in continuous cutting can be ensured; the two chip breaking grooves are adopted in a creatively manner, and therefore, the strength of the tip of the blade can be high, and timely, effective and reliable chip breaking can be ensured. The high-hardness, high-toughness and hard-cutting material machining blade has the advantages of simple structure, high strength, excellent abrasion resistance, timely chip breaking and reliability.

Description

technical field [0001] The invention belongs to the technical field of metal cutting tools, and relates to a machining blade for machining difficult-to-cut materials with high hardness and high toughness, which has the advantages of simple structure, high strength, good wear resistance, timely and reliable chip breaking. Background technique [0002] Although high hardness, high wear resistance, high toughness and difficult-to-cut materials are difficult to machine, they generally have performance advantages that ordinary metal materials cannot match. With the transformation and upgrading of the equipment manufacturing industry, more and more are widely used. . For example, the hardness of 9Cr3Mo after quenching reaches HRC60-68. Although the mechanical properties of the steel are improved after quenching, such as strength, hardness, heat resistance and wear resistance, etc., its machinability is relatively poor, and the chips are flexible and difficult to break. . Therefo...

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Problems solved by technology

For example, the hardness of 9Cr3Mo after quenching reaches HRC60-68. Although the mechanical properties of the steel are improved after quenching, such as strength, hardness, heat resistance and wear resistance, etc., its machinability is relatively poor, and the chips are flexible and difficult to break.

Therefore, the machining of high-hardness, high-toughness and difficult-to-cut materials such as 9Cr3Mo quenched steel not only has a large cutting force, but also has a large tendency to work hardening. The cutting tools in the prior art are prone to severe boundary wear, and the cutting edge strength is difficult to meet the necessary service life. , which affects the stability of processing; because the chips are flexible and not easy to break, the heat dissipation conditions of the tool become worse when they are wrapped around the tool, and a large amount of cutting heat accumulates on the cutting area, which accelerates the softening of the tool, and not only the high temperature causes the blade to lose the hardness required for cutting However, it is reverse-cut by the workpiece, and it is easy to cause the cutting edge of the tool and the cutting tool to produce chip-chip bonding, thereby shortening the service life of the tool and seriously restricting the improvement of production efficiency.

Although different forms of chip breakers are also used in the prior art to achieve the purpose of improving chip breaking, a single form of chip breaker is acceptable for ordinary metals and high-hardness metals, but difficult for high hardness and high toughness such as 9Cr3Mo quenched steel. Cutting materials, not only is it difficult to balance processing efficiency, reliability of continuous cutting, and timely and effective chip removal, but poor chip removal is also easy to scratch the surface energy of the workpiece, which affects the surface processing quality of the workpiece

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