A high-speed electric spindle rotation structure

Abstract

The present invention discloses a high-speed electric spindle rotation structure, comprising a spindle, a carbon fiber spacer, a positioning spacer and a bearing. The spindle has at least one shoulder; the carbon fiber spacer is mounted on the outer surface of the spindle and rotates synchronously with the spindle, one end of the carbon fiber spacer has an annular boss, and the end face of the annular boss fits with one of the shoulders; one end face of the positioning spacer is fixedly connected to an end face of the carbon fiber spacer away from the annular boss, and the inner surface of the positioning spacer does not contact the outer surface of the spindle; the bearing is mounted on the carbon fiber spacer in an interference fit manner and is located on one side of the annular boss. The present invention provides a carbon fiber spacer so that the heat generated by the high-speed rotation friction of the bearing is efficiently conducted to the secondary components in an axial heat conduction manner, and the carbon fiber bearing spacer is located between the bearing and the spindle, thereby achieving a heat insulation effect.

Description

Technical Field

[0001] The present invention relates to the technical field of electric spindles, and in particular to a high-speed electric spindle rotation structure. Background Art

[0002] With the rapid development of modern machining towards higher speeds, the demand for efficient electric spindles is becoming increasingly stringent. Electric spindles are renowned for their high speed, high precision, and excellent dynamic and static stability. The key to achieving these high speeds and precision lies in the bearings. Currently, the bearings used in high-power, high-speed, precision electric spindles are primarily angular contact ceramic ball bearings and hydrostatic bearings. Most electric spindles have bearings directly connected to the spindle. High-speed operation generates significant heat, which is directly transferred to the spindle, causing undesirable deformation such as thermal elongation and expansion, thus affecting machining accuracy.

[0003] In order to reduce the deformation of the spindle caused by heat conduction, existing high-speed electric spindles use expensive special materials. At the same time, they have extremely high requirements on the physical properties of the bearings, such as strength, stiffness, precision, and life. Similarly, the price of the bearings is also high.

[0004] Therefore, how to provide a high-speed electric spindle rotation structure to solve the problem of thermal deformation caused by the electric spindle absorbing a large amount of heat and being unable to dissipate heat in time, as well as the processing error problem caused by thermal deformation, and reduce manufacturing costs, is an urgent problem to be solved by technical personnel in this field. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-speed electric spindle rotation structure to solve the technical problems existing in the above-mentioned prior art.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention discloses a high-speed electric spindle rotation structure, comprising:

[0008] a main shaft having at least one shoulder;

[0009] a carbon fiber spacer ring, the carbon fiber spacer ring being mounted on the outer surface of the main shaft and rotating synchronously with the main shaft, the carbon fiber spacer ring having an annular boss at one end, the end surface of the annular boss being in contact with one of the shaft shoulders;

[0010] a positioning spacer ring, wherein one end surface of the positioning spacer ring is fixedly connected to an end surface of the carbon fiber spacer ring away from the annular boss, and the inner surface of the positioning spacer ring does not contact the outer surface of the main shaft;

[0011] A bearing is mounted on the carbon fiber spacer ring in an interference fit manner and is located on one side of the annular boss.

[0012] Preferably, there are two bearings and they are spaced apart.

[0013] Preferably, the carbon fiber spacer ring is mounted on the outer surface of the main shaft by means of gluing, key connection, interference fit or shrink fitting.

[0014] Preferably, the positioning spacer ring is connected to the carbon fiber spacer ring by gluing, keying or screwing.

[0015] Compared with the prior art, the present invention has achieved the following technical effects:

[0016] The present invention utilizes the high strength and good thermal conductivity of carbon fiber materials to solve the problem of processing errors caused by thermal deformation of the main shaft; the present invention utilizes the light weight of carbon fiber to reduce the weight of the rotating parts inside the electric main shaft, reduce the heat generated by friction in the bearings, and improve the performance of the motor; the present invention uses a carbon fiber bearing spacer design method, and the thermal expansion coefficient of the main shaft material is reduced, which can effectively reduce manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic structural diagram of the high-speed electric spindle rotation structure of this embodiment;

[0019] Explanation of the accompanying reference numerals: 1. Main shaft; 2. Positioning spacer ring; 3. Carbon fiber spacer ring; 4. Bearing. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] The purpose of the present invention is to provide a high-speed electric spindle rotation structure to solve the technical problems existing in the above-mentioned prior art.

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] like Figure 1 As shown, this embodiment provides a high-speed electric spindle rotation structure, including a spindle 1, a positioning spacer ring 2, a carbon fiber spacer ring 3 and a bearing 4.

[0024] The spindle 1 has at least one shoulder (one shoulder in this embodiment). A carbon fiber spacer ring 3 is mounted on the outer surface of the spindle 1 and rotates synchronously with the spindle 1. One end of the carbon fiber spacer ring 3 has an annular boss, the end face of which is in contact with one of the shoulders, providing axial positioning. One end face of the positioning spacer ring 2 is fixedly connected to an end face of the carbon fiber spacer ring 3 away from the annular boss. The inner surface of the positioning spacer ring 2 does not contact the outer surface of the spindle 1, so the positioning spacer ring 2 does not transfer heat to the spindle 1. The bearing 4 is mounted on the carbon fiber spacer ring 3 with an interference fit and is located on one side of the annular boss.

[0025] When the high-speed electric spindle 1 rotating structure of this embodiment is in use, the inner ring of the bearing 4 and the carbon fiber spacer ring 3 rotate together with the spindle 1. The heat generated by the friction of the bearing 4 during rotation is conducted to the outer surface of the carbon fiber spacer ring 3 through the inner ring. The carbon fiber spacer ring 3 absorbs the heat and conducts the excess heat on the outer surface in an axially guided manner, along one direction to the positioning spacer ring 2, and along the other direction to the annular boss. Air cooling, water cooling, etc. can be used to cool and dissipate heat to the end face of the positioning spacer ring 2 and the outer surface of the annular boss to prevent the spindle 1 from deforming due to overheating. The height of the annular boss is preferably higher than the height of the shaft shoulder in contact with it, so as to facilitate cooling of the annular boss.

[0026] In order to improve stability, in this embodiment, two bearings 4 are installed on the carbon fiber spacer ring 3 and are spaced apart.

[0027] There are many ways to install the carbon fiber spacer ring 3, such as installing it on the outer surface of the main shaft 1 by gluing, key connection, interference fit or shrink fitting. Those skilled in the art can flexibly choose according to needs.

[0028] Similarly, there are many ways to install the positioning spacer ring 2, such as connecting it to the carbon fiber spacer ring 3 by gluing, key connection or screw connection. Those skilled in the art can flexibly choose according to needs.

[0029] It should be noted that carbon fiber materials have the advantages of light weight and high strength. Their density is less than 1 / 4 of that of steel, but their strength is 5-7 times that of steel. Compared with aluminum alloy structural parts, the weight reduction effect of carbon fiber composite materials can reach 20% to 40%; compared with steel metal parts, the weight reduction effect of carbon fiber composite materials can reach 60% to 80%. The structure of the carbon fiber spacer ring 3 in this embodiment has the characteristic that the axial thermal conductivity is much greater than the radial thermal conductivity. This embodiment utilizes the high strength and good axial thermal conductivity of carbon fiber materials to solve the problem of processing errors caused by thermal deformation of the main shaft 1; utilizing the light weight of carbon fiber, the weight of the rotating parts inside the electric main shaft 1 is reduced, the heat generated by friction of the bearing 4 is reduced, and the performance of the motor is improved; due to the design of the carbon fiber bearing 4 spacer ring, the thermal expansion coefficient of the main shaft 1 material is reduced, which can effectively reduce the manufacturing cost.

[0030] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A high-speed electric spindle rotation structure, characterized in that: include: a main shaft having at least one shoulder; a carbon fiber spacer ring, the carbon fiber spacer ring being mounted on the outer surface of the main shaft and rotating synchronously with the main shaft, the carbon fiber spacer ring having an annular boss at one end, the end surface of the annular boss being in contact with one of the shaft shoulders; a positioning spacer ring, wherein one end surface of the positioning spacer ring is fixedly connected to an end surface of the carbon fiber spacer ring away from the annular boss, and the inner surface of the positioning spacer ring does not contact the outer surface of the main shaft; a bearing, the bearing being mounted on the carbon fiber spacer ring in an interference fit manner and being located on one side of the annular boss; The carbon fiber spacer ring absorbs heat and conducts excess heat on its outer surface in an axially guided manner in one direction to the positioning spacer ring and in another direction to the annular boss; the end face of the positioning spacer ring and the outer surface of the annular boss are used to dissipate heat using corresponding cooling methods to prevent the main shaft from deforming due to overheating; the height of the annular boss is higher than the height of the shaft shoulder in contact with it, so as to facilitate cooling of the annular boss; the cooling method of the end face of the positioning spacer ring and the outer surface of the annular boss is air cooling or water cooling.

2. The high-speed electric spindle rotation structure according to claim 1, characterized in that: There are two bearings and they are spaced apart.

3. The high-speed electric spindle rotation structure according to claim 1, characterized in that: The carbon fiber spacer ring is mounted on the outer surface of the main shaft by means of gluing, key connection, interference fit or heat installation.

4. The high-speed electric spindle rotation structure according to claim 1, characterized in that: The positioning spacer ring is connected to the carbon fiber spacer ring by gluing, keying or screwing.

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