A heat dissipation spindle structure capable of maintaining rigidity of a numerical control milling machine

Abstract

The utility model relates to numerical control milling machine field discloses a kind of heat dissipation spindle structures of numerical control milling machine can maintain stiffness, including main shaft, with the fixed connection of the shell of the main shaft outside, and with the fixed connection of the inside of shell, front end shell and rear end shell, and support in the front bearing group and rear bearing group of the main shaft outside, the inside side wall of the shell is equipped with first cooling channel, the first cooling channel is spiral type, the inside of the main shaft is provided with inner cooling channel, the inner cooling channel with the first cooling channel is communicated by a swivel joint, the inner wall of the front end shell and the rear end shell is fixedly connected with cooling pipe, the inner wall of the cooling pipe is equipped with multiple injection holes towards the outer ring of the front bearing group and rear bearing group. The utility model has the following advantages and effects: it can realize the accurate and efficient heat dissipation of core heat source main shaft, and inhibit its heat deformation, maintain the effect of machining precision and stability in long-term high-speed operation.

Description

Technical Field

[0001] This utility model relates to the field of CNC milling machine technology, and in particular to a heat-dissipating spindle structure for CNC milling machines that can maintain rigidity. Background Technology

[0002] A CNC milling machine is a machine tool that uses pre-programmed digital instructions to control the movement of each axis of the machine tool to achieve workpiece machining. It consists of a CNC device, a machine tool body, and auxiliary devices. Among them, the electric spindle is one of the core components of the machine tool body. It is responsible for the cutting and other machining actions of the tool. During the cutting and other machining actions, chips are generated, and some of the chips will fly towards the operator, affecting safety.

[0003] The existing cooling structure for CNC milling machine spindles uses indirect cooling, where the heat source (spindle core, bearings) is far from the cooling source, resulting in high thermal resistance and limited heat dissipation for the spindle. This cannot meet the daily heat dissipation needs of the spindle. Furthermore, the simple annular flow channel can cause the coolant to flow in a laminar state, resulting in low heat exchange efficiency. This may lead to uneven heating of the spindle, causing thermal bending and reducing the spindle's rigidity, thus failing to maintain basic machining requirements. Utility Model Content

[0004] The purpose of this invention is to provide a heat-dissipating spindle structure for CNC milling machines that can maintain rigidity. This structure can achieve precise and efficient heat dissipation of the spindle, which is the core heat source, and suppress its thermal deformation, thus maintaining machining accuracy and stability during long-term high-speed operation.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a heat-dissipating spindle structure for maintaining rigidity in a CNC milling machine, comprising a spindle, a housing fixedly connected to the outside of the spindle, a front end housing and a rear end housing fixedly connected to the inside of the housing, and a front bearing assembly and a rear bearing assembly supported on the outside of the spindle. A first cooling channel is provided on the inner sidewall of the housing. The first cooling channel is spiral in shape. An internal cooling channel is provided inside the spindle. By adopting the above-mentioned technical solution, the internal cooling channel facilitates direct spraying of coolant to the front bearing assembly 5 and the rear bearing assembly 6, thereby improving their heat dissipation efficiency.

[0006] A further feature of this invention is that the inner wall of the cooling pipe is provided with a plurality of spray holes facing the outer ring of the front bearing assembly and the rear bearing assembly.

[0007] A further feature of this invention is that the cross-section of the first cooling channel is circular, and the inner wall of the first cooling channel is provided with protrusions.

[0008] A further feature of this invention is that the first cooling channel is fixedly connected to the protrusion, and the protrusion is periodically distributed within the first cooling channel.

[0009] By adopting the above technical solution, it is easy to generate multiple turbulent flows in the first cooling channel, thereby greatly improving its heat exchange with the spindle.

[0010] A further feature of this invention is that the number of bearings in both the front bearing assembly and the rear bearing assembly is two and they are symmetrically distributed. A disc spring that is fixedly connected to the front end shell and the rear end shell is fixedly connected to the outer side of both the front bearing assembly and the rear bearing assembly.

[0011] The channel is connected to the first cooling channel via a rotary joint.

[0012] A further feature of this invention is that cooling pipes are fixedly connected to the inner walls of both the front end shell and the rear end shell.

[0013] By adopting the above technical solution, the disc spring compensates for the slight changes in the structural dimensions of the bearing caused by temperature changes, maintains stable bearing operation, and prevents vibrations generated during bearing operation.

[0014] A further feature of this invention is that the number of cooling pipes is four and they are symmetrically distributed, and the cooling pipes are located on the outside of the bearing.

[0015] By adopting the above technical solution, it is convenient to directly spray coolant to dissipate heat from the front bearing assembly and the rear bearing assembly, thereby improving their heat dissipation efficiency.

[0016] A further feature of this invention is that the first cooling channel is circumferentially symmetrical about the axis of the main shaft, and the cooling pipe is isolated from the first cooling channel and is supplied with liquid by an independent cooling circuit.

[0017] By adopting the above technical solution, it is easy to perform directional and precise spray cooling on the bearing, ensuring its stable operating temperature, thereby maintaining the bearing's preload and support stiffness. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] Figure 2 This is a cross-sectional view of the structure in an embodiment of this utility model;

[0021] Figure 3This is an exploded view of the inside of the spindle in an embodiment of this utility model;

[0022] Figure 4 This is a side sectional view of an embodiment of this utility model.

[0023] In the diagram, 1 is the spindle; 2 is the housing; 3 is the front housing; 4 is the rear housing; 5 is the front bearing assembly; 6 is the rear bearing assembly; 7 is the first cooling channel; 8 is the inner cooling channel; 9 is the cooling pipe; 11 is the protrusion; 12 is the disc spring; and 13 is the rotary joint. Detailed Implementation

[0024] The technical solution of this utility model will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0025] A heat-dissipating spindle structure for maintaining rigidity in a CNC milling machine includes a spindle 1, a housing 2 fixedly connected to the outside of the spindle 1, a front housing 3 and a rear housing 4 fixedly connected to the inside of the housing 2, and a front bearing assembly 5 and a rear bearing assembly 6 supported on the outside of the spindle. A first cooling channel 7 is provided on the inner side wall of the housing 2. The first cooling channel 7 is spiral in shape. An inner cooling channel 8 is provided inside the spindle 1. The inner cooling channel 8 is connected to the first cooling channel 7 through a rotary joint 13.

[0026] During machining, the cooling system is activated, and the coolant flows rapidly in the inner cooling channel 8, directly carrying away the heat from the spindle core. Simultaneously, the coolant flows at high speed and turbulently in the first cooling channel 7, efficiently cooling the housing. Both portions of heat are quickly removed from the system. At the same time, the directional jet cooling system specifically cools the front bearing assembly 5 to ensure stable preload. The disc spring 12 compensates for minor changes in structural dimensions caused by temperature variations, maintaining stable bearing preload.

[0027] Specifically, refer to Figure 2 Cooling pipes 9 are fixedly connected to the inner walls of both the front shell 3 and the rear shell 4.

[0028] In a specific implementation, it is convenient to directly spray coolant to dissipate heat from the front bearing assembly 5 and the rear bearing assembly 6, thereby improving their heat dissipation efficiency.

[0029] Specifically, refer to Figure 4 The inner wall of the cooling pipe 9 is provided with multiple spray holes facing the front bearing assembly 5 and the outer ring of the rear bearing assembly.

[0030] In a specific embodiment, after the coolant enters the cavity through an external pipeline, it forms a jet through micron-sized injection holes and directly impacts the outer ring surface of the front bearing assembly 5 to achieve efficient heat exchange.

[0031] Specifically, refer to Figure 2 The flow channel cross-section of the first cooling channel 7 is circular, and the inner wall of the first cooling channel 7 is provided with protrusions 11.

[0032] In a specific implementation, the protrusion 11 is used to turbulent the coolant. The spiral and the turbulence structure work together to disrupt the laminar boundary layer of the coolant, induce turbulence, and significantly improve the convective heat transfer coefficient.

[0033] Specifically, refer to Figure 2 The first cooling channel 7 is fixedly connected to the protrusion 11, and the protrusion 11 is periodically distributed within the first cooling channel 7.

[0034] In a specific implementation, multiple turbulent flows are generated in the coolant inside the first cooling channel 7, thereby significantly improving its heat exchange with the spindle.

[0035] Specifically, refer to Figure 2 and Figure 3 The front bearing assembly 5 and the rear bearing assembly 6 each contain two bearings that are symmetrically distributed. Both the front bearing assembly 5 and the rear bearing assembly 6 have a butterfly spring 12 that is fixedly connected to the front end shell 3 and the rear end shell 4 on their outer sides.

[0036] In a specific implementation, the butterfly spring 12 compensates for the slight changes in the structural dimensions of the bearing caused by temperature changes, maintains stable bearing operation, and prevents vibrations generated during bearing operation.

[0037] Specifically, refer to Figure 2 There are four cooling pipes 9, which are symmetrically distributed and located on the outside of the bearing.

[0038] In a specific implementation, it is convenient to directly spray coolant to dissipate heat from the front bearing assembly 5 and the rear bearing assembly 6, thereby improving their heat dissipation efficiency.

[0039] Specifically, refer to Figure 2 The first cooling channel 7 is symmetrically distributed about the axis of the main shaft 1. The cooling pipe 9 is isolated from the first cooling channel 7 and is supplied with liquid by an independent cooling circuit.

[0040] In a specific implementation, directional and precise spray cooling is achieved for the front bearing assembly 5, the component with the highest heat density and most critical stiffness in the spindle 1, ensuring stable operating temperature and thus maintaining the bearing's preload and support stiffness.

[0041] The above describes the basic principles, main features, and advantages of this utility model. The standard parts used in this utility model can all be purchased from the market, and the irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts, and equipment all adopt conventional models in the prior art, which will not be described in detail here.

[0042] The control method of this utility model is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the field. Since this utility model is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail.

[0043] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A heat-dissipating spindle structure for maintaining rigidity in a CNC milling machine, comprising a spindle (1), a housing (2) fixedly connected to the outside of the spindle (1), a front end housing (3) and a rear end housing (4) fixedly connected to the inside of the housing (2), and a front bearing assembly (5) and a rear bearing assembly (6) supported on the outside of the spindle, characterized in that: The inner sidewall of the housing (2) is provided with a first cooling channel (7), which is spiral in shape. The main shaft (1) is provided with an inner cooling channel (8), which is connected to the first cooling channel (7) through a rotary joint (13).

2. The heat-dissipating spindle structure for maintaining rigidity in a CNC milling machine according to claim 1, characterized in that: Cooling pipes (9) are fixedly connected to the inner walls of both the front end shell (3) and the rear end shell (4).

3. A heat-dissipating spindle structure for maintaining rigidity in a CNC milling machine according to claim 2, characterized in that: The inner wall of the cooling pipe (9) is provided with a plurality of spray holes facing the outer ring of the front bearing assembly (5) and the rear bearing assembly.

4. A heat-dissipating spindle structure for maintaining rigidity in a CNC milling machine according to claim 3, characterized in that: The flow channel cross section of the first cooling channel (7) is circular, and the inner wall of the first cooling channel (7) is provided with protrusions (11).

5. A heat-dissipating spindle structure for maintaining rigidity in a CNC milling machine according to claim 4, characterized in that: The first cooling channel (7) is fixedly connected to the protrusion (11), and the protrusion (11) is periodically distributed in the first cooling channel (7).

6. A heat-dissipating spindle structure for maintaining rigidity in a CNC milling machine according to claim 5, characterized in that: The front bearing assembly (5) and the rear bearing assembly (6) each have two bearings that are symmetrically distributed. The outer sides of the front bearing assembly (5) and the rear bearing assembly (6) are fixedly connected with butterfly springs (12) that are fixedly connected to the front end shell (3) and the rear end shell (4).

7. A heat-dissipating spindle structure for maintaining rigidity in a CNC milling machine according to claim 6, characterized in that: The number of cooling pipes (9) is four and they are symmetrically distributed. The cooling pipes (9) are located on the outside of the bearing.

8. A heat-dissipating spindle structure for maintaining rigidity in a CNC milling machine according to claim 7, characterized in that: The first cooling channel (7) is symmetrically distributed about the axis of the main shaft (1). The cooling pipe (9) is isolated from the first cooling channel (7) and is supplied with liquid by an independent cooling circuit.

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