A built-in electric spindle for high-speed milling and drilling

Abstract

The invention discloses a built-in type electric main shaft for high-speed milling and drilling and relates to an electric main shaft for machining. The electric main shaft comprises a shaft body, a front bearing component, a rear bearing component, a stator, a rotor, a water-gas path component, a cylinder component, a dust cover and a front cover, wherein the rotor comprises a cylindrical rotor main body; a clamping head for clamping a shank is inserted in the front end of the rotor main body and is in cylindrical tapered surface fit with the front end of the rotor main body; a proximity switch (serving as an opening and closing knife stroke sensor), a speed measurement sensor and an azimuth encoding disc are arranged in the shaft body and close to the rear end, the proximity switch serving as the opening and closing knife stroke sensor and the speed measurement sensor can realize corresponding feedback protection, and the azimuth encoding board can realize functions of real-time position feedback and instant accurate stop of the rotor under the control of a PLC (programmable logic controller); and the dust cover and the front cover are provided with cooling water pipelines for cooling a cutting tool, and cooling water flows through the shaft body and the dust cover from the water-gas path component to finally reach the front cover. The built-in type electric main shaft adopts a high-speed built-in collet chuck (clamping head), the accuracy of the inner tapered surface of the clamping head during full indicator movement can be less than or equal to 0.001mm, the static deviation of a shaft end is less than or equal to 0.002mm, and the vibration is less than or equal to 1.0mm / s, so that the requirements for high-accuracy processing can be met.

Description

technical field [0001] The invention relates to an electric spindle for machining, in particular to a built-in electric spindle for high-speed milling and drilling. Mainly used in glass panel processing machines, various light processing precision engraving machines, precision inner hole grinding and light processing centers, etc. Background technique [0002] At present, the built-in electric spindle used for high-speed milling and drilling has the following disadvantages: [0003] one, such as figure 1 and 2 As shown, the existing electro-spindle adopts broach claw + ISO (or BT) handle, and then installs the form of ER shrinkage nozzle to complete the tool clamping. This kind of clamping method will cause the imbalance of the electro-spindle to be too large, and then It produces negative effects of large vibration and large dynamic deflection, so it is difficult to meet the requirements of high-precision forming processing, and at the same time, the structure is complex...

AI Technical Summary

Problems solved by technology

[0003] one, such as figure 1 and 2 As shown, the existing electro-spindle adopts broach claw + ISO (or BT) tool holder, and then installs the form of ER shrinkage nozzle to complete the tool clamping. This kind of clamping method will lead to a large unbalance of the electro-spindle, and then It produces negative effects of large vibration and large dynamic deflection, so it is difficult to meet the requirements of high-precision forming processing. At the same time, the structure is complex and it is inconvenient to replace the tool

[0004] Second, it is driven by a vector control frequency converter. The drive control method is V-F curve drive, and the output power is basically proportional to the speed within the rated speed range. This kind of driving method cannot complete real-time position feedback and instantaneous accurate stop positioning. Function

[0005] Third, when working, in order to improve the performance and service life of milling and drilling tools, a separate cooling pipeline must be used to cool the cutting tool, but the cooling linkage of the independent pipeline is not good, and the cooling effect is not ideal

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