Multi-step forming reamer

Abstract

The invention discloses a multi-step forming reamer. The multi-step forming reamer comprises a shank (1) and a reamer body (2), wherein the reamer body (2) comprises a plurality of end cutting edges (3), peripheral cutting edges (4) connected between the end cutting edges (3) and the shank (1), and chip removal grooves (5) correspondingly formed between the peripheral cutting edges (4); each of the peripheral cutting edges (4) is of a right hand spiral structure and is provided with at least two steps; rake angles of the steps are positive rake angles; and the closer the steps are to the shank(1), the larger the diameters and rake angles of the steps are. In the multi-step forming reamer, the step with the largest diameter adopts a large rake angle, and the rake angle of the step with thesmallest diameter can be ensured to be the positive rake angle so as to enhance the sharpness of the cutting edges, reduce the cutting resistance, and significantly improve the surface quality and roughness of inner walls of holes.

Description

technical field [0001] The invention relates to a machining tool, in particular to a multi-step forming reamer. Background technique [0002] With the continuous improvement of China's economic level, people's demand for vehicles and other travel tools is increasing. At present, the number of orders for automobiles is huge, the product technology requirements are high, and the requirements for modern manufacturing levels are getting higher and higher. Especially in the processing of automotive engine rotary parts, due to the problems of soft material, high wear resistance, and severe work hardening, the processing is very difficult; and this type of parts also has high size requirements and thin curved surfaces. High wall, fast processing cycle (within 10s completion time for a single part), high life requirements and other manufacturing difficulties, so the requirements for the composite, wear resistance and precision of the tool are very high. [0003] Some of the proces...

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Problems solved by technology

[0005] However, the reamers in the prior art still have the following problems: 1. In the step reamers in the prior art, such as the reamers disclosed in the above-mentioned patents, only a certain step (side cutting edge) is provided with a front corners, while other steps have no rake angle, resulting in other steps not sharp enough, so it is difficult to ensure the overall surface quality and machining accuracy of the stepped holes; Corresponding uniform distribution, small chip removal space, prone to chattering phenomenon during processing, which is not conducive to improving processing accuracy and surface quality; When the force is large, the reamer blade is easy to break; 4. Due to other reasons of unreasonable structure, the surface quality of the processed stepped hole is poor, and there are undesirable phenomena such as vibration marks

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