Expanding-reaming-extruding cutter

Abstract

The invention discloses an expanding-reaming-extruding cutter, which comprises a precision reaming reamer bit section, a pre-reamed hole blade section and a back guide section, wherein the reamer bit section is positioned at the front end of the reamer bit section; the cutting edges of the pre-reamed hole blade section and the reamer bit section are coaxial; the diameter of the pre-reamed hole blade section is smaller than that of the reamer bit section; the diameter difference value between the reamer bit section and the pre-reamed hole blade section is 0.06-0.20 millimeter; the width of the outer circle circular edge of the pre-reamed hole blade section is 0.8-1.2 millimeters; the back guide section is positioned at the back end of the reamer bit section; the diameter of the reamer bit section is larger than that of the back guide section; and the diameter difference value between the reamer bit section and the back guide section is 0.005 millimeter. Due to the adoption of the structural and size designs of the expanding-reaming-extruding cutter, hole processing accuracy is increased, the service life of the cutter can be effectively prolonged, and processing efficiency is increased.

Description

technical field [0001] The invention relates to a machining tool, in particular to a reaming and extruding tool for machining high-precision holes, especially deep and long holes with high requirements on cylindricity and roughness. Background technique [0002] Reamers are used in the field of high-precision hole processing on metal materials, such as engines, gearboxes, machine tools, automobiles and other machinery manufacturing industries, as long as there are holes, this technology is needed. [0003] Taking the parts of automobile engines as an example, with the development of science and technology, the precision of machining is getting higher and higher, and the precision of machining holes is even more strict. Its material is generally relatively soft material such as aluminum and cast iron. Such as figure 1 For the structure of the traditional reamer used now, it is divided into a cutter head 1' and a guide section 2' (cutter body). The cutter head 1' directly a...

AI Technical Summary

Problems solved by technology

[0005] 1. The traditional reamer generally only has a section of alloy cutting edge, and the surface roughness of the reamed hole is not high, and generally cannot be kept within Ra1.6 for a long time

[0006] 2. Because the traditional reamer has a guide section that cooperates with the guide sleeve to guide the gap, the size of the processed hole is unstable and can only reach the accuracy of H9. The roundness and taper of the hole can only reach 0.01mm. If the fine reamer is larger Aperture When the hole is longer (≥50mm), the roundness of the hole is greater than 0.015, and the taper is greater than 0.015

[0007] 3. When the traditional reamer is processing a hole with a relatively long distance between the position of the machined hole and the guide sleeve, the vibration generated by the tool-fixture-machine tool system is directly reflected on the surface of the machined hole, and there will often be a section in the hole. Cut scratches, resulting in poor cylindricity of the hole, roughness

[0008] 4. Because the traditional reamer has only one cutting edge, in order to avoid the reaming hole not being pierced, the final reaming allowance is often relatively large, and the unilateral allowance is greater than 0.25mm

The large machining allowance increases the wear on the tool, and it is basically impossible to regrind and continue to use it. The tool life is relatively short and the cost is high

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