Diamond composite milling cutter for oil spray nozzle mounting hole

Abstract

The invention provides a diamond composite milling cutter for an oil spray nozzle mounting hole, and relates to cutters. The milling cutter comprises a cutter body and a cutter handle, wherein the cutter body is composed of a first-stage cutting section, a second-stage cutting section and a third-stage cutting section; a cooling flow channel is arranged in the cutter body and the cutter handle; afirst-stage water flushing hole is formed in a chip removal groove in the first-stage cutting section, the water outlet direction of the first-stage water flushing hole is forward, and an included angle of 10-60 degrees is formed between the first-stage water flushing hole and the axial direction; a second-stage water flushing hole is formed in a chip removal groove in the second-stage cutting section, the water outlet direction of the second-stage water flushing hole is backward, and an included angle of 10-45 degrees is formed between the second-stage water flushing hole and the axial direction; and a third-stage water flushing hole is formed in a chip removal groove in the third-stage cutting section, and the water outlet direction of the third-stage water flushing hole is perpendicularto the axial direction. A dynamic balance design method comprises the steps that a cutter model is drawn in three-dimensional drawing software; the gravity center coordinates of the cutter are determined; the length of the chip removing groove in a gravity center coordinate phase area is set as a variable; and the gravity center coordinates are adjusted according to the variable, and the value ofthe variable with the gravity center coordinates close to center coordinates is selected as a design value. The cutter is high in cooling performance and chip removal performance, long in service life and high in dynamic balance precision.

Description

technical field [0001] The invention relates to a cutting tool for mechanical processing and a dynamic balance design method thereof. Specifically, it relates to a diamond composite milling cutter for fuel injection nozzle mounting holes with high cooling performance and chip removal performance, long service life and high dynamic balance precision. Background technique [0002] At present, the high-precision holes of many engines and parts are processed by diamond multi-stage milling cutters. The advantage of the multi-stage milling cutter is that the cutter body is designed according to the requirements of different depths and different diameters in the hole, so that it can be processed and formed at one time, avoiding the time-consuming method of multiple milling cutters and improving efficiency. The fuel injector mounting hole on the engine cylinder head has different diameter and shape requirements at different depths; the existing fuel injector mounting hole is difficu...

AI Technical Summary

Problems solved by technology

The fuel injector mounting hole on the engine cylinder head has different diameter and shape requirements at different depths; the existing fuel injector mounting hole is difficult to achieve the expected effect in actual processing with a diamond composite milling cutter

Differences in cutting diameters and step lengths of multi-stage milling cutters often lead to resonance in machining. Although the design of uneven-toothed cutters can effectively reduce the resonance between the cutter-machine-workpiece, it introduces unbalanced variables to the cutter itself, especially It is the asymmetric design of the cooling flow channel and the flushing hole, which further increases the unbalance and its uncertainty; when designing, it cannot be accurately estimated and calculated, resulting in vibration unbalance during machining and vibration marks on the machined surface

In the prior art, a dynamic balance instrument is used to correct the dynamic balance by drilling or turning part of the material, which not only affects the appearance, but also has low work efficiency, requiring repeated measurements and removals to achieve the tolerance of the unbalanced amount

The chips produced by the milling cutter during cutting are limited by the size of the multi-step difference, which is not easy to be discharged smoothly, which seriously hinders the heat dissipation of the cutter body, resulting in increased tool wear, reduced cutting ability and shortened life.

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