TWI665050B - Rotary shaft cooling system with high thermal conductivity and high heat dissipation - Google Patents

Abstract

A rotary shaft heat dissipation system with high thermal conductivity and high heat dissipation rate includes: a main shaft unit, a clamp unit, a copper heat conductive bushing, an aluminum heat sink collar, and an aluminum heat sink collar; an end portion of the main shaft unit is provided with a mounting portion; a clamp The unit has a shaft, and one end of the shaft is detachably fixed to the mounting portion, and the other end of the shaft is provided with a tool head clamping portion; a copper heat conducting sleeve is sleeved and fastened to the shaft; aluminum The heat dissipation collar is sleeved and fastened to the copper heat-conducting shaft sleeve, and the outer surface has a heat dissipation structure; the tool head unit is removably fixed to the tool head clamping portion, and includes a head end of a processing workpiece and a plug for insertion. The mounting end of the tool head clamping portion, the end surface of the mounting end facing the tool head clamping portion and the tool head clamping portion maintain a space so that the end surface does not contact the tool head clamping portion.

Description

Rotary shaft cooling system with high thermal conductivity and high heat dissipation

The invention relates to a shaft heat dissipation system, in particular to a shaft heat dissipation system with a high heat absorption copper heat conducting sleeve and a high heat dissipation aluminum heat dissipation collar applied to a combined, rotating processing tool.

A machine tool whose processing tools (such as cutting tools, grinding wheels, friction stir tools) contact a workpiece with a rotating shaft, when the processing tools contact the workpiece, the processing tool will generate high temperature (for example, friction during friction stir welding, friction The stirring head will generate high temperature above 500 ° C). In this case, when the product enters mass production, the continuous processing high temperature generated by the processing tool will be transmitted to the equipment spindle, which will accelerate the damage of the internal parts of the equipment in the long run, and in the field of friction stir welding In particular, in the production of aluminum alloy thick plate products, or welding of high-melting-point materials that have been popular in recent years, the high temperature of stirring will cause accelerated loss of equipment parts and abrasion of the stirring head.

Taking friction stir welding tool machine as an example, as shown in FIG. 1, the traditional friction stir tool is an integrated design, that is, a single material design of a single material is used for the mixing head 121 and the mounting part 122 mounted on the spindle unit 1. Head 12, and this structural design makes it easier for the heat during processing to be transferred directly and in large quantities to the spindle unit 1, thereby affecting the life of the spindle unit 1.

The object of the present invention is to use a clamp to fix a tool head to a combined tool of a machine tool spindle, and combine a copper heat-conducting shaft sleeve with a high heat transfer material on the clamp to absorb the heat on the clamp unit, and then an aluminum heat-dissipating collar It is sleeved on the copper heat-conducting shaft sleeve, and the heat absorbed by the copper heat-conducting shaft sleeve is quickly air-cooled and radiated, and the torque of the rotation of the spindle unit can be further used to generate air circulation circulation heat dissipation and improve heat dissipation efficiency.

In order to achieve the above object, the present invention provides a rotating shaft heat dissipation system with high thermal conductivity and high heat dissipation rate, comprising: a main shaft unit for providing a rotational torque, an end portion is provided with a mounting portion; a clamp unit having a rod One end of the shaft is detachably fixed to the mounting portion so that the clamp unit rotates with the spindle unit. The other end of the shaft is provided with a tool head clamping portion; a copper heat-conducting shaft sleeve , Set and fastened to the shaft; an aluminum cooling collar, set and fastened to the copper heat-conducting shaft sleeve, the outer surface of which has a heat dissipation structure; a tool head unit, which can be removed and fixed The tool head holding part is provided with a head end of a machining workpiece and a mounting end for inserting the tool head holding part, and an end surface of the mounting end facing the tool head holding part and the tool head holding part A space is maintained so that the end surface does not contact the tool head clamping portion.

In one embodiment, the tool head unit is a cutting tool, a grinding tool or a welding tool.

In one embodiment, the tool head unit is a friction stir welding tool.

In one embodiment, the copper heat-conducting shaft sleeve is installed on the shaft in a hot sleeve assembly manner.

In one embodiment, the tool head clamping portion of the clamp unit protrudes from the shaft to form a shoulder portion, and the copper heat conducting sleeve is abutted against the shoulder portion.

In one embodiment, the heat dissipating structure of the aluminum heat dissipating collar is a plurality of spaced radially outwardly protruding annular fins.

In one embodiment, the heat dissipating structure of the aluminum heat dissipating collar is a plurality of blades that protrude axially outwardly around the entire circumference at an equiangular circumference.

In an embodiment, the blades guide the air around the blades to flow away from the shaft when the clamp unit is rotated.

In one embodiment, the spindle unit is disposed on a machine tool base, and the machine tool base can move synchronously with the spindle unit, but does not rotate with it. The shaft cooling system further includes a shroud unit. It is provided with a fixing portion and a cover body portion, which is used to be mounted on the base of the machine tool and cover the main shaft unit. One side of the cover body portion has a cover opening facing the aluminum heat dissipation collar. The shroud unit is provided with a plurality of through holes near the main shaft unit.

In one embodiment, the cover body portion is provided with a tapered surface that is contracted by the cover opening toward the fixed portion.

The present invention is characterized in that the present invention applies a combined tool (combined with a clamp unit, an air blade unit, and a tool head unit) to be mounted on the spindle unit, so that the heat of the tool head unit is not directly transmitted from the shaft center to the spindle unit in large quantities. The invention uses copper with high thermal conductivity as the substrate (copper heat-conducting bushing), which is closely sleeved to the clamp unit, and transfers the heat generated by the tool head unit to the heat from the outer diameter of the shaft center. A copper heat-conducting bushing is mounted on the outer diameter of the copper heat-conducting bushing with an aluminum heat-dissipating ring of an aluminum material having a specific heat capacity greater than copper, but having a density much lower than that of copper. The copper heat-conducting bushing is passed over The heat is quickly air-cooled. This creation is equipped with a heat dissipation structure on the outer surface of the aluminum cooling collar, which can be further improved by cleverly combining the rotational power during processing of the spindle unit. Actively and continuously contact the air and agitate the wind, which can improve the heat exchange efficiency without additional power.

A‧‧‧tool machine

B‧‧‧base

AF‧‧‧Airflow

HF‧‧‧ heat flux

S‧‧‧ interval

X‧‧‧center axis

W‧‧‧ Workpiece

1‧‧‧ Spindle Unit

11‧‧‧Mounting Department

12‧‧‧Integrated mixing head

121‧‧‧ mixing head

122‧‧‧Mounting Department

2‧‧‧ Fixture unit

21‧‧‧ shaft

22‧‧‧Tool head clamping section

23‧‧‧Shoulder

3‧‧‧Bronze Thermal Conductive Bushing

35‧‧‧Aluminum cooling collar

351‧‧‧cooling structure

3511‧‧‧Circular wings

3512‧‧‧ Blade

4‧‧‧tool head unit

41‧‧‧Headend

42‧‧‧mounting end

421‧‧‧face

5‧‧‧ Shroud unit

51‧‧‧Fixed section

52‧‧‧Cover body

521‧‧‧ Cover

53‧‧‧ cone

54‧‧‧through hole

[Fig. 1] is a tool head unit of the prior art; [Fig. 2] is an exploded front view of a shaft heat dissipation system with high thermal conductivity and high heat dissipation rate according to the present invention; [Figure 3] Three-dimensional exploded view of the combined cutter of the thermal conductivity and high thermal conductivity of the shaft cooling system; [FIG. 4] is a sectional view before FIG. 3; [FIG. 5] This is a rotary shaft cooling system with high thermal conductivity and high heat dissipation of the present invention The heat dissipating structure is a front sectional view of the embodiment of the annular fin; [FIG. 6] The heat dissipating structure of the rotary shaft heat dissipating system with high thermal conductivity and high heat dissipating capacity according to the present invention is a front sectional view of the blade embodiment; [FIG. 7] FIG. 2 is a front view combination view during processing.

The following is a detailed description of this creative embodiment in conjunction with the drawings. The drawings are mainly simplified diagrams, which illustrate the basic structure of the creative only in a schematic way. Therefore, only the components related to the creative are marked in these drawings Moreover, the displayed components are not drawn according to the number, shape, size ratio, etc. of the implementation, and the actual implementation specifications are an optional design, and the component layout may be more complicated.

Please refer to FIG. 2, FIG. 3, FIG. 4 and FIG. 6. The shaft heat dissipation system with high thermal conductivity and high heat dissipation rate of this embodiment is mainly applied to a shaft (such as a machine tool A spindle), and includes: a spindle unit 1, a clamp unit 2, a copper heat conductive sleeve 3 , Aluminum cooling collar 35 and tool head unit 4. The spindle unit 1 is provided with a turning torque, and an end portion of the spindle unit 1 is provided with a mounting portion 11; the clamp unit 2, which is generally a steel product, has a shaft 21, and one end of the shaft 21 is detachable It is grounded to the mounting portion 11 of the spindle unit 1 so that the clamp unit 2 rotates with the rotation of the spindle unit 1. The other end of the shaft 21 is provided with a tool head clamping portion 22; the copper heat conduction The shaft sleeve 3 is sleeved and fastened to the shaft 21, and the fastening method can be a hot sleeve assembly method, but it is not limited to this fastening method; the aluminum heat-dissipating collar 35 is sleeved and Fastened to the outer diameter of the copper heat-conducting shaft sleeve 3, the outer surface of the aluminum heat-dissipating collar 35 has a heat-dissipating structure 351; the tool head unit 4 (the tool head unit 4 may be a cutting tool, a grinding tool or a welding tool, for example The friction stir welding tool (quoted in this embodiment) is detachably fixed to the tool head holding portion 22 of the clamp unit 2 to rotate as the clamp unit 2 rotates. The above-mentioned clamp unit 2, a copper heat-conducting shaft sleeve 3, an aluminum heat-dissipating collar 35, and a tool head unit 4 are combined into a combined tool.

As shown in FIG. 6, with the above structure, when the spindle unit 1 rotates to process the workpiece W, the aluminum heat dissipation collar 35 can rotate with it, so the heat dissipation structure 351 can guide the tool of the combined tool. The external air and the heat on the combined tool form a circulating air flow to generate heat dissipation. For example, the heat dissipation structure 351 is a plurality of blades 3512 that protrude outwardly around the circumferential surface at equal angular intervals. The inclination or curved surface is used to make the The air around the blade 3512 is agitated when the clamp unit 2 rotates (the blades 3512 guide the air around the blade 3512 when the clamp unit 2 rotates to flow away from the shaft 21), as shown by the dotted line in FIG. 6 Airflow AF indicated by arrow.

Of course, in another embodiment, as shown in FIG. 5, the heat-dissipating structure 351 of the aluminum heat-dissipating collar 35 is a plurality of annular fins 3511 protruding radially outwardly spaced along the central axis X axis, and when When a large amount of heat of the tool head unit 4 is transmitted to the copper heat conducting sleeve 3 and the annular fin 3511 of the aluminum heat sink collar 35, air cooling can be performed quickly, and the heat transmitted from the tool head unit 4 to the spindle unit 1 can be reduced.

Further, as shown in FIG. 2 and FIG. 7, the spindle unit 1 is set on a machine base A of the machine tool A, and the machine base B of the machine tool A can move synchronously with the spindle unit 1, but does not follow. Turning, the rotating shaft heat dissipation system further includes a shroud unit 5 having a fixing portion 51 and a cover body portion 52. The fixing portion 51 is used to be mounted on the base B of the machine tool A and covers the main shaft. The unit 1 has a cover opening 521 facing the tool head unit 4 on one side of the cover body portion 52. In addition, the shroud unit 5 is provided with a plurality of through holes 54 near the spindle unit 1.

In an embodiment of the shroud unit 5, the cover body portion 52 is provided with a tapered surface 53 that is contracted by the cover opening 521 toward the fixing portion 51.

In one embodiment, as shown in FIG. 3 and FIG. 7. In this embodiment, the tool head unit 4 includes a head end 41 for processing a workpiece W and a mounting end 42 for inserting the tool head clamping portion 22, and after the installation (a normal mounting method is the tool head clamping portion 22 is provided with a concave screw hole, and the mounting end 42 is provided with a protruding screw, and the two are screw-fixed to each other), the end surface 421 of the mounting end 42 facing the tool head clamping portion 22 and the tool head clamping portion 22 Maintain an air-filled interval S (as shown in FIG. 5) so that the end surface 421 does not abut the tool head clamping portion 22 (as shown in FIG. 5), so as to reduce the heat of the tool head unit 4 from the shaft center Pass directly to this fixture unit 2. When the tool head unit 4 transfers the heat generated during processing to the copper heat-conducting bushing 3, the copper heat-conducting bushing 3 can quickly absorb its heat and transfer it to the aluminum heat-dissipating collar 35, and then the heat-dissipating aluminum The heat-dissipating collar 35 is dissipated into the air (the path from the heat flow HF to the air flow AF indicated by the solid arrow in FIG. 7), so that the heat transmitted from the tool head unit 4 to the clamp unit 2 can be reduced.

In order for the copper heat-conducting shaft sleeve 3 and the aluminum heat-dissipating collar 35 to be firmly mounted on the tool head clamping portion 22 of the clamp unit 2, the tool head clamping portion 22 is protruded from the shaft 21. A shoulder portion 23 is formed, and the copper heat-conducting shaft sleeve 3 and the aluminum heat-dissipating collar 35 abut against the shoulder portion 23, as shown in FIGS. 3 and 4.

The above implementation form merely illustrates the principle, characteristics, and effects of this creation, and is not intended to limit the scope of implementation of this creation. Anyone who is familiar with this skill can do the above without departing from the spirit and scope of this creation Modifications and changes to the implementation form. Any equivalent changes and modifications made by using the content disclosed in this creation shall still be covered by the scope of patent application described below. Therefore, the scope of protection of the rights of this creation should be as listed in the scope of patent application.

Claims (10)

A rotating shaft heat dissipation system with high thermal conductivity and high heat dissipation rate includes: a main shaft unit for providing a rotational torque, an end portion of which is provided with a mounting portion; a clamp unit having a shaft, and one end portion of the shaft It is detachably fixed to the mounting portion, so that the clamp unit rotates with the spindle unit. The other end of the shaft is provided with a tool head clamping portion; a copper heat-conducting sleeve is sleeved and fastened to The shaft; an aluminum heat-dissipating collar, which is sleeved and fastened to the outer diameter of the copper heat-conducting shaft sleeve, and has a heat-dissipating structure on the outer surface; and a tool head unit, which is removably fixed to the tool head The clamping part includes a head end of a processing workpiece and a mounting end for inserting the tool head clamping part, and an end surface facing the mounting end of the tool head clamping part and the tool head clamping part maintain a space between them The end surface does not contact the tool head clamping portion. The shaft heat dissipation system with high thermal conductivity and high heat dissipation rate according to claim 1, wherein the tool head unit is a cutting tool, a grinding tool or a welding tool. The shaft heat dissipation system with high thermal conductivity and high heat dissipation rate according to claim 1, wherein the tool head unit is a friction stir welding tool. The shaft heat dissipation system with high thermal conductivity and high heat dissipation rate as described in claim 1, wherein the copper heat conductive sleeve is installed on the shaft in a hot sleeve assembly manner. The shaft heat dissipation system with high thermal conductivity and high heat dissipation rate as described in claim 1, wherein the tool head clamping portion of the clamp unit protrudes from the shaft to form a shoulder, and the copper heat conductive sleeve Attach against the shoulder. The shaft heat dissipation system with high thermal conductivity and high heat dissipation rate according to claim 1, wherein the heat dissipation structure of the aluminum heat sink ring is a plurality of annular wings protruding radially outwardly spaced along the central axis. sheet. The shaft heat dissipation system with high thermal conductivity and high heat dissipation rate as described in claim 1, wherein the heat dissipation structure of the aluminum heat sink ring is a plurality of outwardly protruding blades which surround the circumferential surface at equal angular intervals. The shaft heat dissipation system with high thermal conductivity and high heat dissipation rate according to claim 7, wherein the blades guide the air around the blade to flow away from the shaft when the clamp unit is rotated. The shaft heat dissipation system with high thermal conductivity and high heat dissipation rate according to claim 1, wherein the spindle unit is disposed on a machine tool base, and the machine tool base can move synchronously with the spindle unit, but does not follow During the rotation, the rotating shaft heat dissipation system further includes a shroud unit having a fixing portion and a cover body portion, the fixing portion is used to be mounted on the base of the machine tool and covers the main shaft unit, the cover body. One side of the part has a cover opening facing the tool head unit, and the shroud unit is provided with a plurality of through holes near the main shaft unit. The rotating shaft heat dissipation system with high thermal conductivity and high heat dissipation rate according to claim 9, wherein the cover body portion is provided with a tapered surface that is contracted from the cover opening to the fixed portion.