TWM637810U - Cooling structure of machine tool main shaft system - Google Patents

Abstract

The invention discloses a cooling structure of a machine tool spindle system, which has a shaft sleeve installed in the machine tool spindle system, the outer peripheral wall of the shaft sleeve is provided with a side-by-side flow channel adjacent to its first end, and is connected to the side-by-side flow channel and The spiral flow channel extending to its second end forms a compound flow channel of side-by-side flow channel and spiral flow channel, which is used to make the external coolant enter the side-by-side flow channel and spiral flow channel for cooling. The coolant cools the spindle system before flowing out to the outside. This creation makes the coolant flow from the side-by-side flow channel to the spiral flow channel in sequence, and can exchange heat with the bearings inside the first end and the second end of the bushing, reduce the temperature of the bearing and the bushing, and dissipate the heat Take off the main shaft system, and then improve the shortcomings of the conventional main shaft cooling structure, and achieve the purpose of improving cooling efficiency and uniform cooling.

Description

Cooling Structure of Machine Tool Spindle System

The invention relates to the technical field of machine tool spindle cooling, especially a cooling structure of a machine tool spindle system, which is used to avoid thermal deformation caused by heat accumulation when the spindle is running.

In the spindle system of today's machine tools, there is a spindle rotatably arranged in a bushing. The two ends of the bushing are respectively provided with a plurality of bearings. The bearings are used to support the rotation of the spindle. The front end of the spindle is Used in combination with tools for machining. When the spindle rotates at high speed, the bearing in the sleeve will heat up due to factors such as load and friction. If the heat generated by the bearing is not eliminated, when the heat accumulates to a certain temperature, the spindle system will be thermally deformed, elongated and damaged. For this reason, various known cooling technologies are used in the spindle system.

As shown in FIG. 1 , a known cooling technology is to implement a side-by-side flow channel on the outer peripheral surface of the shaft sleeve 100. The side-by-side flow channel has a plurality of grooves 101 surrounding the outer peripheral surface of the shaft sleeve 100 in parallel with each other and The protruding ring 102 is provided with a communication groove 103 axially connecting the two grooves 101 at a selected position of the protruding ring 102 . When the coolant flows into the groove 101 from one end of the sleeve 100 , it not only circulates along the annular structure of the groove 101 , but also flows axially to the next groove 101 through the communication groove 103 . However, this conventional side-by-side flow channel technology, due to the structural factors of the corners of the side-by-side grooves 101 and the connecting groove 103, restricts the cooling liquid to flow in a detour, so kinetic energy loss occurs during the circulation process, resulting in the cooling of the cooling liquid. After heat exchange with shaft sleeves and bearings, the heat cannot be removed immediately through efficient flow, which leads to the problem of heat accumulation and reduces the cooling efficiency of the spindle system.

Referring to Fig. 2, another known cooling technology is to implement a spiral flow channel on the outer peripheral surface of the shaft sleeve 100. The spiral flow channel is mainly provided with a spiral groove 104 on the outer peripheral surface of the shaft sleeve 100, and the spiral groove The groove 104 extends from one end of the sleeve 100 to the other end of the sleeve 100 in a continuous spiral circle along the outer peripheral surface. The cooling liquid also flows from the helical groove 104 at one end of the bushing 100. The helical groove 104 does not have the structure of the above-mentioned side-by-side flow channel with high flow resistance, so that the flow rate of the cooling liquid is faster, and the cooling efficiency for the spindle system is relatively better. However, the head and tail ends of the helical groove 104 are limited by processing, and it is still easy to cause heat accumulation due to uneven cooling.

The main purpose of this creation is to provide a cooling structure for the machine tool spindle system, which improves the cooling flow channel on the outer peripheral wall of the shaft sleeve applied to the machine tool spindle system, so that the coolant can exchange heat evenly with the shaft sleeve and the bearing, and can Avoid the loss of kinetic energy of the coolant, thereby achieving the effects of improving cooling efficiency and uniform cooling.

In order to achieve the above purpose, the preferred technical solution of the cooling structure of the machine tool spindle system of the present invention includes: a shaft sleeve with an outer peripheral wall and an inner peripheral wall, and the outer peripheral wall has a side-by-side side-by-side wall adjacent to the first end of the shaft sleeve. A flow channel, and a spiral flow channel connected to the side-by-side flow channel and extending toward the second end of the sleeve, is used to allow an external cooling liquid to enter the side-by-side flow channel and then flow to the spiral flow channel channel, and then flow out to the outside after passing through the spiral flow channel; the side-by-side flow channel includes a plurality of parallel grooves parallel to each other surrounding the peripheral wall, and a parallel convex ring formed between each parallel groove, Each of the parallel convex rings has a connecting channel connecting each of the parallel grooves; the spiral flow channel includes at least one spiral groove that spirally surrounds the outer peripheral wall, and a spiral convex ring is formed between the spiral grooves; One end of the spiral groove communicates with a parallel groove in the side-by-side flow channel, and the other end of the spiral groove extends to the second end of the sleeve.

In one preferred solution, in the cooling structure of the machine tool spindle system, the inner peripheral wall near the first end of the shaft sleeve has a first heating surface, and the side-by-side flow channel corresponds to the first heating surface on the outer peripheral wall.

In one of the preferred schemes, in the above-mentioned cooling structure of the machine tool spindle system, the parallel axial length of the plurality of parallel grooves is greater than or equal to the axial length of the first heated area.

In one of the preferred solutions, in the above-mentioned cooling structure of the machine tool spindle system, the inner peripheral wall near the second end of the shaft sleeve has a second heating surface, and the spiral flow channel corresponds to the second heating surface on the outer peripheral wall.

In one of the preferred solutions, in the cooling structure of the machine tool spindle system, the helical groove extends on the peripheral wall through the corresponding second heating surface to the second end of the sleeve.

In one of the preferred schemes, the positions of the connecting passages of the side-by-side flow channels are arranged in a staggered manner, the parallel convex ring of one of the parallel convex rings is arranged on its first side, and the other adjacent parallel convex ring is set on its second side.

In one of the preferred schemes, the cooling structure of the machine tool spindle system further includes a coolant inlet connected to a parallel groove of the side-by-side flow channel; and a coolant outlet connected to the spiral flow channel spiral groove.

In one of the preferred schemes, in the above-mentioned cooling structure of the machine tool spindle system, the shaft sleeve has a guide groove near the second end, the guide groove surrounds the outer peripheral wall, and the other end of the helical groove communicates with the In the first position of the guide groove, the coolant outlet communicates with the second position of the guide groove.

The cooling structure of the tool machine spindle system of this invention, the side-by-side flow channel and the spiral flow channel on the outer peripheral wall of the shaft sleeve form a composite flow channel cooling structure, when the coolant enters the side-by-side flow channel from the coolant inlet When circulating in the parallel grooves, it can evenly exchange heat with the bearings in contact with the first heating surface to lower the temperature, and the cooling liquid can also bring the heat of the bearings at the first end of the sleeve to the spiral flow channel. When the coolant flows in the spiral groove of the spiral flow channel, the loss of kinetic energy of the coolant can be reduced through the spiral structure, so that the coolant can quickly flow out from the coolant outlet, preventing heat from accumulating at the second end of the sleeve, and at the same time When the cooling liquid flows through the second heating surface area, it can also exchange heat with the bearings in contact with the second heating surface to lower the temperature, and then the heated cooling liquid can quickly flow out from the cooling liquid outlet. Therefore, the invention can achieve effects such as improving cooling efficiency and uniform cooling.

The structural features and other functions and purposes of this creation are described in detail as follows according to the embodiments of the accompanying drawings:

Referring to Fig. 3 and Fig. 4, this invention creates a cooling structure for the machine tool spindle system, which can be applied to the spindle systems of various machine tools such as vertical machine tools, horizontal machine tools, and oscillating spindle machine tools. The specific embodiment includes: a shaft sleeve 10, which is a cylinder with an outer peripheral wall 11 and an inner peripheral wall 12, and a plurality of bearings 200 are provided near the first end inside, so that the inner peripheral wall 12 near the first end forms Contact the first heating surface 121 of a plurality of bearings 200; on the contrary, the second end opposite to the first end provides a plurality of bearings 300, so that the inner peripheral wall 12 near the second end forms a second heating surface 122 contacting a plurality of bearings 300, The bearings 200 , 300 are used to support a main shaft 400 rotating in the sleeve 10 .

The feature of this creation is that: the outer peripheral wall 11 of the above-mentioned shaft sleeve 10 is implemented with a side-by-side flow channel 20 adjacent to its first end, and a side-by-side flow channel 20 connected to the side-by-side flow channel 20 and extending toward the second end of the shaft sleeve 10 A spiral flow channel 30 . The side-by-side flow channel 20 corresponds to the first heating surface 121 on the outer peripheral wall 11 , and the spiral flow channel 30 corresponds to the second heating surface 122 on the outer peripheral wall 11 , thereby forming the outer peripheral wall of the sleeve 10 11 has a cooling structure with composite flow channels. The cooling structure of the composite flow channel of this creation is used to make an external cooling liquid enter the side-by-side flow channel circulation 20, and then cool (heat exchange) in the area of the first heating surface 121; The spiral flow channel 30 is capable of cooling (heat exchange) in the area of the second heating surface 122 , and the cooling liquid flows out to the outside after passing through the spiral flow channel 30 .

The above-mentioned side-by-side flow channel 20 is specifically implemented with a plurality of (more than two) parallel grooves 21 parallel to each other surrounding the outer peripheral wall 11, and a parallel convex ring 22 formed between each of the parallel grooves 21, And each of the parallel protruding rings 22 has a connecting channel 23 (as shown in FIG. 4 and FIG. 5 ) that communicates with each of the parallel grooves 21 in the axial direction. Wherein, the parallel axial length of the multiple parallel grooves 21 of the side-by-side flow channel 20 is greater than or equal to the axial length of the first heat receiving area 121 , which can completely cool the first heat receiving area 121 . The positions of the connecting passages 23 of the side-by-side runners 20 are staggered, that is, a parallel protruding ring 22 is arranged on its first side, and another parallel protruding ring 22 adjacent to it is arranged on its second side, so that After the coolant enters a parallel groove 21, it flows circumferentially (as shown in Figure 5 ), then flows into the next parallel groove 21 through the connecting channel 23 on the first side, and then passes through the connecting channel 23 on the second side after the same circumferential flow. The connecting channel 23 then flows into the next parallel groove, and so on for the subsequent flow patterns. A more specific shape of the connecting channel 23 can be formed by a flat surface 231 or a groove processed by the parallel protruding ring 22, so that the coolant can flow axially.

The above-mentioned spiral channel 30 includes at least one spiral groove 31 spirally surrounding the outer peripheral wall 11, and a spiral convex ring 32 formed between the spiral grooves 31; more specifically, one end of the spiral groove 31 communicates with the A parallel groove 21 in the side-by-side flow channel 20, and the other end of the helical groove 31 extends to the second end of the sleeve 10. Specifically, the helical groove 31 extends through the corresponding The second heating surface 122 is connected to the second end of the sleeve 10 . Therefore, after the cooling liquid flows through all the above-mentioned parallel grooves 21 (as shown in FIG. 5 ), it will continue to flow into the spiral groove 31 of the spiral flow channel 30, and flow to the The second end of the shaft sleeve 10 cools the area of the second heat receiving surface 122 when it passes through the area of the second heat receiving surface 122 .

Referring again to Fig. 3, the preferred embodiment of the present invention further comprises a coolant inlet 40 and a coolant outlet 50, the coolant inlet 40 and the coolant outlet 50 are implemented on other components of the spindle system, so that The coolant inlet 40 communicates with the parallel groove 21 closest to the first end of the side-by-side flow channel 20 , and the coolant outlet 50 communicates with the end of the spiral groove 31 of the spiral flow channel 30 , which The preferred position of the cooling liquid outlet 50 can be in a connection structure tangential to the helical extension direction of the helical groove 31 , which can prevent the cooling liquid from losing kinetic energy before entering the cooling liquid outlet 50 . More specifically, there is a guide groove 60 near the second end of the sleeve 10 in the present invention, and the guide groove 60 surrounds the outer peripheral wall 11 for a week, and the other end of the above-mentioned spiral groove 31 is connected to the At the first position of the guiding groove 60 , the cooling liquid outlet 50 communicates with the second position of the guiding groove 60 .

When the cooling structure of the machine tool spindle system of the present invention is in operation, the side-by-side flow passage 20 and the spiral flow passage 30 of the outer peripheral wall 11 of the shaft sleeve 10 form a composite flow passage cooling structure. When 40 enters the parallel groove 21 of the side-by-side flow channel 20, it can evenly exchange heat with the bearing 200 and other components in contact with the first heating surface 121 to cool down, and the cooling liquid can also make the first end of the shaft sleeve 10 The heat of the bearing 200 is carried to the spiral flow channel 30 . It is found through experiments that the cooling effect of the invention on the first end of the shaft sleeve 10 can increase the cooling effect by 20% compared with the conventional parallel flow channel or spiral flow channel.

Next, when the coolant flows in the spiral groove 31 of the spiral channel 30, the loss of kinetic energy of the coolant is reduced through the spiral structure, so that the coolant quickly flows out from the coolant outlet 50, preventing heat from accumulating in the bushing 10 In the circulation system, when the cooling liquid flows through the second heating surface 122 area, it can also exchange heat with the bearing 300 contacting the second heating surface 122 to reduce the temperature, and then make the heated cooling liquid quickly pass through the guide recess The tank 60 then exits the coolant outlet 50 . Also through experiments, the cooling effect of this invention on the second end of the shaft sleeve 10 can increase the cooling effect by 5% compared with the known parallel flow channel or spiral flow channel, and the highest possible contact surface between this invention and the shaft sleeve 10 Up to 6% cooling effect.

To sum up, the cooling structure of the main shaft system of the creative machine tool is indeed practical and creative, and the application of its technical means is undoubtedly novel, and the effect and design purpose are indeed consistent, and it has been said to be a reasonable progress. For this reason, I filed a new patent application in accordance with the law, but I sincerely ask the Jun Bureau for detailed examination and granting the patent as a prayer, I am very grateful.

10: shaft sleeve

11: Peripheral wall

12: Inner peripheral wall

121: the first heating surface

122: Second heating surface

20: Side-by-side runners

21: parallel groove

22: parallel convex ring

23: Link channel

231: Plane

30: spiral flow channel

31: spiral groove

32: spiral convex ring

40: Coolant inlet

50: Coolant outlet

60: guide groove

200, 300: bearing

400:Spindle

[Fig. 1] It is a perspective schematic diagram of a side-by-side runner with sleeves in a spindle system of a conventional processing machine. [Fig. 2] It is a schematic perspective view of the shaft sleeve spiral flow channel of the conventional processing machine spindle system. [Fig. 3] It is a cross-sectional schematic diagram of the composite flow channel of the shaft sleeve applied to the spindle system. [Fig. 4] It is a perspective schematic diagram of the composite flow channel applied to the shaft sleeve of the spindle system. [Figure 5] is a schematic diagram of the flow direction of the coolant in the compound flow channel of this creation.

10: shaft sleeve

11: Peripheral wall

12: Inner peripheral wall

121: the first heating surface

122: Second heating surface

20: Side-by-side runners

21: parallel groove

22: parallel convex ring

30: spiral flow channel

31: spiral groove

32: spiral convex ring

40: Coolant inlet

50: Coolant outlet

60: guide groove

200, 300: bearing

400:Spindle

Claims (8)

A cooling structure for a machine tool spindle system, comprising: A shaft sleeve, which has an outer peripheral wall and an inner peripheral wall, the outer peripheral wall has a side-by-side flow channel adjacent to the first end of the shaft sleeve, and a side-by-side flow channel connected to the side-by-side flow channel and extending toward the second end of the shaft sleeve The spiral flow channel is used to make an external cooling liquid flow into the side-by-side flow channel and then flow to the spiral flow channel, and then flow out to the outside after passing through the spiral flow channel; The side-by-side flow channel includes a plurality of parallel grooves surrounding the outer peripheral wall in parallel with each other, and a parallel convex ring formed between each of the parallel grooves, each of the parallel convex rings has a function to communicate with each of the parallel grooves a continuous channel; The spiral flow channel includes at least one spiral groove spirally surrounding the outer peripheral wall, and a spiral convex ring formed between the spiral grooves; one end of the spiral groove communicates with a parallel groove in the side-by-side flow channel, the The other end of the helical groove extends to the second end of the sleeve. The cooling structure of the machine tool spindle system according to claim 1, wherein the inner peripheral wall near the first end of the bushing has a first heating surface, and the side-by-side flow channel corresponds to the first heating surface on the outer peripheral wall. The cooling structure of the machine tool spindle system according to claim 2, wherein the parallel axial length of the plurality of parallel grooves is greater than or equal to the axial length of the first heated area. The cooling structure of the machine tool spindle system according to claim 1, wherein the inner peripheral wall near the second end of the sleeve has a second heating surface, and the spiral flow channel corresponds to the second heating surface on the outer peripheral wall. The cooling structure of the machine tool spindle system according to claim 4, wherein the helical groove extends on the peripheral wall through the corresponding second heating surface to the second end of the sleeve. According to the cooling structure of the machine tool spindle system described in claim 1, the positions of the connecting channels of the side-by-side flow channels are arranged in a staggered manner, and the parallel convex ring on one of the parallel convex rings is arranged on its first side, adjacent The other parallel protruding ring is arranged on its second side. The cooling structure of the machine tool spindle system according to claim 1 further comprises a coolant inlet connected to a parallel groove of the side-by-side flow channel; and a coolant outlet connected to the spiral flow channel Spiral groove. The cooling structure of the tool machine spindle system according to claim 7, wherein the second end of the sleeve has a guide groove, the guide groove surrounds the outer peripheral wall, and the other end of the helical groove communicates with In the first position of the guide groove, the coolant outlet communicates with the second position of the guide groove.

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