Air bearing electric spindle and drilling machine

Abstract

The invention discloses an air bearing electric spindle and a drilling machine. The air bearing electric spindle comprises a machine body assembly and a shaft core assembly, wherein an axial inner hole is formed in the machine body assembly; the shaft core assembly is provided with a rotor and a flying disc, and the shaft core assembly is supported in the axial inner hole through an air bearing; and the air bearing comprises an air bearing motor assembly and an air thrust bearing assembly, the air bearing motor assembly comprises a stator core, the stator core is located on the outer side of the rotor, the stator iron core is provided with a coil winding and radial air supply holes, the radial air supply holes are distributed in the circumferential direction of the stator core, and used for forming a static pressure air film for supporting the shaft core assembly after ventilation, and the air thrust bearing assembly is matched with the flying disc. The radial air bearing and a motor are deeply integrated together, so that the shaft has the functions of the air bearing and the motor, a set of parts is correspondingly saved, the structure is more compact, the space utilization is more reasonable, and conditions are created for improving the power of the electric spindle under the same volume.

Description

technical field [0001] The invention is used in the fields of turning and boring, and in particular relates to an air-floating electric spindle and a drilling machine. Background technique [0002] The air bearing and driving motor of the traditional electric spindle are independent of each other, and their respective functions are also single, which makes the traditional electric spindle have the following shortcomings: [0003] 1. The size of the electric spindle is larger and heavier; [0004] 2. The axial dimension of the rotating shaft is longer, and the deflection generated when the shaft rotates is larger, which restricts the running accuracy of the electric spindle; at the same time, the longer shaft makes it more difficult to guarantee the machining accuracy, and the process reliability cannot be improved. ; [0005] 3. The shaft core of the main shaft is too long, the weight is heavier, and its moment of inertia is larger, which restricts the response speed of th...

AI Technical Summary

Problems solved by technology

[0003] 1. The size of the electric spindle is larger and heavier;

[0004] 2. The axial dimension of the rotating shaft is longer, and the deflection generated when the shaft rotates is larger, which restricts the running accuracy of the electric spindle; at the same time, the longer shaft makes it more difficult to guarantee the machining accuracy, and the process reliability cannot be improved. ;

[0005] 3. The shaft core of the main shaft is too long, the weight is heavier, and its moment of inertia is larger, which restricts the response speed of the main shaft;

[0006] 4. The shaft core of the spindle is too long and the weight is heavier, the critical speed of the motor rotor cannot be increased, which restricts the further increase of the limit speed of the electric spindle;

[0007] 5. The shaft core of the spindle is too long and the weight is heavier, the friction loss of its operation is greatly increased, and the power consumption becomes larger, which restricts the efficiency of the electric spindle from being improved

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