Machine tool spindle cooling structure capable of preventing thermal elongation of spindle core

Abstract

The utility model relates to a machine tool spindle cooling structure capable of preventing thermal elongation of a central spindle, which is characterized in that the central spindle is connected with a sleeve through a bearing, and the central spindle sleeve is fixedly connected with a machining center; a first heat transfer spacer bush is arranged between the shaft core and the shaft core sleeve; the bottom of the shaft core sleeve is connected with a front cover; a first heat transfer spacer bush is arranged on the inner side of the shaft core front cover and is hermetically connected with the peripheral wall of the bottom wall of the shaft core; a first spiral groove is formed in the outer wall of the central spindle sleeve, a first medium inlet is transversely formed in the middle of the central spindle machining center in a penetrating mode, a first medium outlet is transversely formed in the upper portion of the central spindle machining center in a penetrating mode, and the first central spindle medium inlet and the first medium outlet both communicate with the first central spindle spiral groove; cooling liquid is introduced into the central spindle of the machine tool, heat dissipation is conducted on multiple positions of the central spindle, then effective heat dissipation of the interior of the mechanical central spindle is achieved, the service life of a bearing is greatly prolonged, the heating expansion parameter is controllable, and thermal elongation of the central spindle is effectively avoided.

Description

Technical Field

[0001] This utility model relates to the field of machine tools, and in particular to a machine tool spindle cooling structure for preventing thermal elongation of the spindle core. Background Technology

[0002] The bottom of the shaft is connected to the cutting tool. During high-speed rotation, the shaft and the parts connected to it generate a lot of heat, which causes the parts to expand due to heat. For example, after the shaft expands, the axial length increases, the positioning of the sleeve and the shaft becomes inaccurate, and then the end of the shaft moves axially. The axial movement of the end of the shaft will cause the cutting tool at the bottom of the shaft to have inaccurate stroke, which will ultimately lead to inaccurate dimensions of the machined parts.

[0003] In summary, how to cool the shaft during rotation has become an urgent problem for researchers in this field. Utility Model Content

[0004] The technical problem to be solved by this utility model is: how to cool the shaft core during its rotation.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] This utility model relates to a machine tool spindle cooling structure to prevent thermal expansion of the spindle core. The spindle core is connected to a sleeve via a bearing, and the sleeve is fixedly connected to a machining center. A first heat transfer spacer is provided between the spindle core and the sleeve. A front cover is connected to the bottom of the sleeve, and the inner side of the front cover is provided with a first heat transfer spacer that is sealed to the outer peripheral wall of the bottom wall of the spindle core. A first spiral groove is provided on the outer wall of the sleeve. A first medium inlet is provided transversely through the middle of the machining center, and a first medium outlet is provided transversely through the upper part of the machining center. Both the first medium inlet and the first medium outlet are connected to the first spiral groove.

[0007] Furthermore, the outer wall of the first heat transfer sleeve is provided with a second spiral groove, the top of the second spiral groove is connected to the first bolt groove through a first connecting groove that penetrates the shaft core laterally, and the bottom of the sleeve is provided with a second medium outlet that penetrates laterally.

[0008] Furthermore, a third spiral groove is provided on the outer wall of the bottom wall of the sleeve. The second medium inlet includes a first horizontal cavity opened laterally on one side of the shaft core and a first vertical cavity opened axially on the same side as the shaft core. The top of the first vertical cavity is connected to the first horizontal cavity, and a second connecting groove connects the first vertical cavity and the third spiral groove.

[0009] Furthermore, the second medium outlet on the other side of the shaft core includes a second horizontal cavity opened laterally in the shaft core and a second vertical cavity opened axially in the shaft core, the second vertical cavity being connected to the third spiral groove through a third connecting groove.

[0010] Furthermore, the inner wall of the front cover is recessed into an annular cooling groove, the bottom of the first vertical cavity is connected to the annular cooling groove through a fourth connecting groove, and the bottom of the second vertical cavity is connected to the annular cooling groove through a fifth connecting groove.

[0011] Furthermore, the feature is that a limiting cover is fixedly provided at the bottom of the shaft core, and the limiting cover supports the bottom of the front cover and the first heat transfer sleeve.

[0012] The beneficial effects of this utility model are as follows: This utility model is a machine tool spindle cooling structure that prevents thermal expansion of the spindle core. By introducing coolant into the spindle core of the machine tool, heat is dissipated from multiple points in the spindle core, thereby achieving effective heat dissipation inside the mechanical spindle core, greatly improving the service life of the bearing, and making the thermal expansion parameters controllable, effectively preventing thermal expansion of the spindle core. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 yes Figure 1 Enlarged view of point A;

[0016] Figure 3 This is a schematic diagram of the structure showing the direction of medium flow. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0018] In order to achieve cooling of the shaft during rotation and prevent thermal expansion of the shaft, the following embodiments are disclosed in this solution;

[0019] This embodiment is a machine tool spindle cooling structure to prevent thermal expansion of the spindle core. See [link / reference] Figure 1In the figure, the sleeve 1 is vertically arranged in the axial direction. The external connection of the sleeve 1 is the machining center 2. The sleeve 1 is equipped with a shaft core 3. The shaft core 3 is connected to the sleeve 1 by two bearings 4. A first heat transfer partition 5 is arranged between the two bearings 4 and in the gap between the shaft core 3 and the sleeve 1. The first heat transfer partition 5 can transfer the heat generated by the shaft core 3 to the sleeve 1. The first heat transfer partition 5 can also effectively separate the upper and lower bearings 4 to ensure the distance between the upper and lower bearings 4.

[0020] A front cover 7 is fitted on the outer side of the bottom of the sleeve 1, and a second heat transfer sleeve 6 is provided on the outer side of the bottom part (handle) of the shaft core 3. The second heat transfer sleeve 6 can transfer the heat generated at the bottom of the shaft core 3 to the front cover 7 for heat dissipation.

[0021] See Figure 2 The picture shows Figure 1 Magnification at point A Figure 1 In this embodiment, in addition to heat transfer through the second heat transfer sleeve 6 and the first heat transfer sleeve 5, the heat generated by the shaft core 3 is also carried away by the flow of two streams of coolant, thereby cooling the shaft core 3.

[0022] First stream of coolant:

[0023] The outer wall of the sleeve 1 is provided with a first spiral groove 11. The machining center 2 is provided with a first medium outlet 21 and a first medium inlet 22 in the horizontal direction at the upper and lower positions. The outer wall of the first heat transfer diaphragm 5 is provided with a second spiral groove 51. The first medium inlet 22 is connected to the top end of the second spiral groove 51 through a first connecting groove 81. The second medium outlet 12 is provided in the horizontal direction on the sleeve 1. The left end of the second medium outlet 11 is connected to the bottom end of the second spiral groove 51.

[0024] See Figure 3 In this way, the first stream of coolant is diverted from the first medium inlet 22, moves upward through the first spiral groove 11, carries away the heat of the bushing 1 and the machining center 2, and then flows out from the first medium outlet 21; and enters the second spiral groove 51 from the first connecting groove 81, moves downward through the spiral groove, carries away the heat of the sleeve 1 and the shaft core 3, and then flows out from the second medium outlet 12.

[0025] Compared to the traditional bottom-up spiral cooling method, this design that splits the coolant flow vertically results in a shorter coolant travel distance and improved cooling efficiency.

[0026] Second stream of coolant:

[0027] The outer peripheral wall of the bottom of the sleeve 1 is provided with a third spiral groove 13. A first horizontal cavity 14 and a first vertical cavity 15 are provided on one side of the sleeve 1. The first vertical cavity 14 and the third spiral groove 13 are connected by a second connecting groove 82. A second horizontal cavity 121 and a second vertical cavity 122 are provided on the other side of the sleeve 1. The second vertical cavity 122 is connected to the third spiral groove 13 through a third connecting groove 83.

[0028] See Figure 3 In this way, the second stream of coolant passes through the first horizontal cavity 14, the first vertical cavity 15, the second connecting groove 82, the third spiral groove 13, the third connecting groove 83, and the second vertical cavity 122 in sequence, and is discharged from the second horizontal cavity 121 of the second medium outlet 12, thereby achieving cooling between the front cover 7 and the sleeve 1.

[0029] Furthermore, the front cover 7 and the second heat transfer sleeve 6 have an annular cooling groove 61. The bottom of the first vertical cavity 15 is connected to the annular cooling groove 61 through a fourth connecting groove 84. Similarly, the bottom of the second vertical cavity 122 is connected to the annular cooling groove 61 through a fifth connecting groove 82. (See also...) Figure 3 In this way, the second stream of coolant will enter the annular cooling tank 61 from the first vertical cavity 15 and the fourth connecting groove 84. After completing the heat exchange, it will be discharged from the second horizontal cavity 121 of the second medium outlet 12 through the fifth connecting groove 85 and the second vertical cavity 122, thereby realizing the heat exchange between the front cover 7 and the outer wall at the bottom of the shaft core 3.

[0030] In addition, a limit cover 9 is fixedly provided at the bottom of the shaft core 3. The limit cover 9 is fixed to one end of the bottom of the shaft core 3 by a locking member. The limit cover 9 is used to support the bottom of the front cover 7 and the first heat transfer sleeve 6.

[0031] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A machine tool spindle cooling structure to prevent thermal elongation of the spindle core, characterized in that, The shaft core is connected to the sleeve via a bearing, and the sleeve is fixedly connected to the machining center; a first heat transfer spacer is provided between the shaft core and the sleeve; a front cover is connected to the bottom of the sleeve, and the inner side of the front cover is provided with a first heat transfer spacer that is sealed to the outer peripheral wall of the bottom wall of the shaft core. The outer wall of the sleeve is provided with a first spiral groove, the middle part of the machining center is provided with a first medium inlet, and the upper part of the machining center is provided with a first medium outlet. The first medium inlet and the first medium outlet are both connected to the first spiral groove.

2. The machine tool spindle cooling structure for preventing thermal elongation of the spindle core according to claim 1, characterized in that, The outer wall of the first heat transfer sleeve is provided with a second spiral groove, the top of the second spiral groove is connected to the first spiral groove through a first connecting groove that penetrates the shaft core laterally, and the bottom of the sleeve is provided with a second medium outlet that penetrates laterally.

3. The machine tool spindle cooling structure for preventing thermal elongation of the spindle core according to claim 2, characterized in that, A third spiral groove is provided on the outer wall of the bottom wall of the sleeve. The second medium inlet includes a first horizontal cavity opened laterally on one side of the shaft core and a first vertical cavity opened axially on the same side as the shaft core. The top of the first vertical cavity is connected to the first horizontal cavity, and a second connecting groove connects the first vertical cavity and the third spiral groove.

4. The machine tool spindle cooling structure for preventing thermal elongation of the spindle core according to claim 3, characterized in that, The second medium outlet on the other side of the shaft core includes a second horizontal cavity opened laterally in the shaft core and a second vertical cavity opened axially in the shaft core. The second vertical cavity is connected to the third spiral groove through a third connecting groove.

5. The machine tool spindle cooling structure for preventing thermal elongation of the spindle core according to claim 4, characterized in that, The inner wall of the front cover is recessed with an annular cooling groove. The bottom of the first vertical cavity is connected to the annular cooling groove through a fourth connecting groove, and the bottom of the second vertical cavity is connected to the annular cooling groove through a fifth connecting groove.

6. The machine tool spindle cooling structure for preventing thermal elongation of the spindle core according to claim 1, characterized in that, A limiting cover is fixedly installed at the bottom of the shaft core, and the limiting cover supports the front cover and the bottom of the first heat transfer sleeve.

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