Shaft core cooling assembly, main shaft and machine tool

Abstract

The utility model discloses a shaft core cooling assembly, main shaft and machine tool, including machine body part and shaft core part, the shaft core part is supported on the machine body part through the bearing, the shaft core cooling assembly forms the independent assembly that can be dismantled on the main shaft, the shaft core part extends from the first end to the second end along the axial direction, and the shaft core part extends from the first end to the second end along the axial direction. A connecting end face used for being connected with a spindle core of a spindle is formed at the second end of the spindle core component, the spindle core component is provided with a cooling flow channel extending to the connecting end face, and the machine body component is provided with a cooling connector communicated with the cooling flow channel. According to the technical scheme, the detachable cooling module used for cooling circulation of the spindle core is adopted, is independent of the structure of the spindle, and has the advantages of being simple in structure, high in stability and convenient to mount and dismount. The cooling device can be applied to high / low rotating speed of various spindles, can bear higher cooling water pressure, and is better in cooling effect.

Description

Technical Field

[0001] The utility model is used in the field of spindles, and particularly relates to a shaft core cooling assembly, a spindle and a machine tool. Background Art

[0002] Motor spindles are widely used in various machine tools because of their advantages such as convenient installation, compact structure, light weight, small vibration, high rotational speed, high machining accuracy and stable machining effect. As the core functional component of a machine tool, the performance of the spindle directly determines the technical level of various key technical indicators of the machine tool equipment, such as power, torque, thermal elongation, etc. With the upgrade of machine tools from medium and low-end to medium and high-end, more stringent technical requirements are put forward for various indicators of the spindle.

[0003] Among the various indicators of the spindle, two indicators will seriously affect the customer's machining effect and the equipment use efficiency - the size of the spindle thermal elongation (including stability) and the spindle thermal stability time. The greater the spindle thermal elongation, the lower the dimensional accuracy of the parts during the machining process, and the form and position tolerances cannot be guaranteed; the longer the machining time, the more obvious the performance. The greater the thermal elongation, the greater the difference in thermal elongation in each speed range, and the more machining abnormalities will occur when changing the speed during the machining process, especially the dimensions in the Z-axis direction that coincide with the spindle thermal elongation direction. The worse the spindle thermal stability, the more sensitive it is to temperature changes, speed changes, and downtime during the tool change process, the more difficult it is to control the accuracy of the machine tool, and the more abnormal points there are during the use process. The spindle thermal stability time is more fatal in restricting the machining time of various high-end machine tools. The thermal elongation of a conventional motor spindle generally takes 15 - 20 minutes, and it is generally required that the machine tool be preheated for more than 20 minutes before machining. At the same time, during the machining process, downtime due to the replacement of machining parts requires re-preheating, which seriously restricts the use efficiency of the machine tool.

[0004] At present, the main ways to solve the problems of the spindle thermal elongation size and the spindle thermal stability time are as follows: ① adding a shaft core displacement sensor for compensation; ② using a shaft core material with a smaller coefficient of thermal expansion; ③ designing a cooling circulation structure for the shaft core. For these several commonly used improvement methods, they have their advantages, but the disadvantages are obvious. Thermal expansion sensors are expensive, have high protection requirements, high maintenance costs, and can only measure the absolute data of the shaft core thermal elongation, but cannot solve the problem of the thermal elongation change of the machine tool headstock caused by the change of the spindle cooling. Therefore, a large amount of application data needs to be provided additionally for supplementary adjustment. Shaft cores made of low-expansion materials are expensive, and the hardness of the shaft core cannot be increased, resulting in low shaft system strength and poor wear resistance, so they cannot be applied in large quantities. Therefore, shaft core circulating cooling is an important one among many solutions. However, in the prior art, the shaft core circulating cooling structure is directly set in the spindle structure and is inseparable from the spindle itself structure, resulting in high spindle cost and complex structure. Summary of the Utility Model

[0005] The purpose of the present utility model is to solve at least one of the technical problems existing in the prior art, and to provide a shaft core cooling assembly, a main shaft and a machine tool.

[0006] The technical solution adopted by the present utility model to solve its technical problems is as follows:

[0007] In a first aspect, a shaft core cooling assembly includes a body component and a shaft core component. The shaft core component is supported by bearings on the body component. The shaft core cooling assembly forms an independent assembly that can be disassembled and assembled on the main shaft. The shaft core component extends axially from a first end to a second end. The second end of the shaft core component forms a connection end face for connecting with the shaft core of the main shaft. The shaft core component is provided with a cooling flow channel extending to the connection end face, and the body component is provided with a cooling interface communicating with the cooling flow channel.

[0008] Combined with the first aspect, in some implementation manners of the first aspect, the cooling flow channel includes a liquid inlet cooling flow channel and a liquid return cooling flow channel. The cooling interface includes a liquid inlet cooling interface communicating with the liquid inlet cooling flow channel and a liquid return cooling interface communicating with the liquid return cooling flow channel.

[0009] Combined with the first aspect and the above implementation manners, in some implementation manners of the first aspect, the liquid inlet cooling flow channel penetrates from the first end to the second end of the shaft core component along the axis of the shaft core component. The liquid inlet cooling interface is communicated with the port of the liquid inlet cooling flow channel at the first end of the shaft core component. The liquid return cooling flow channel extends from the second end to the first end direction of the shaft core component. The body component is provided with a conversion sleeve outside the first end of the shaft core component. A ring groove communicating with the liquid return cooling flow channel is provided between the conversion sleeve and the shaft core component. The liquid return cooling interface is communicated to the ring groove.

[0010] Combined with the first aspect and the above implementation manners, in some implementation manners of the first aspect, the second end of the shaft core component is supported by bearings on the body component. The body component is provided with a skeleton oil seal between the bearing and the conversion sleeve. The skeleton oil seal is matched with the outer peripheral surface of the shaft core component. The skeleton oil seal forms a first liquid storage groove on the side facing the conversion sleeve.

[0011] Combined with the first aspect and the above implementation manners, in some implementation manners of the first aspect, the body component is provided with a first air flow channel communicating between the skeleton oil seal and the conversion sleeve.

[0012] Combined with the first aspect and the above implementation manners, in some implementation manners of the first aspect, a bearing gland that axially abuts against the inner ring of the bearing is provided between the shaft core component and the skeleton oil seal. A protective cover is provided outside the bearing gland on the body component. A labyrinth seal structure is formed between the protective cover and the bearing gland. The protective cover is provided with a pressure equalizing groove and a radial hole communicating with the pressure equalizing groove at the labyrinth seal structure. The body component is provided with a second air flow channel extending to the radial hole. A second liquid storage tank is provided between the protective cover and the body component. The body component is provided with an overflow hole communicating with the second liquid storage tank.

[0013] Combined with the first aspect and the above implementation manners, in some implementation manners of the first aspect, a transmission component is provided at the second end of the shaft core component. One side of the transmission component axially abuts against the inner ring of the bearing, and a transmission structure for connecting with the shaft core of the main shaft is provided on the other side of the transmission component.

[0014] Combined with the first aspect and the above implementation manners, in some implementation manners of the first aspect, a connection seat is provided at a position of the body component close to the second end of the shaft core component. The connection seat is provided with fastening connection members for connecting with the body of the main shaft, and a plurality of the fastening connection members are circumferentially distributed along the body component.

[0015] In a second aspect, a main shaft includes the shaft core cooling assembly according to any one of the implementation manners in the first aspect.

[0016] In a third aspect, a machine tool includes the main shaft according to any one of the implementation manners in the second aspect.

[0017] At least one of the technical solutions in the above technical solutions has the following advantages or beneficial effects: The technical solution of the present utility model provides a detachable cooling module for cooling the shaft core of the main shaft. When in use, the shaft core cooling assembly is installed on the main shaft, the shaft core component is connected with the shaft core of the main shaft, the shaft core coolant flows through the body component from the cooling interface and enters the cooling flow channel of the shaft core component, and the coolant advances axially along the cooling flow channel, flows through the shaft core, realizes shaft core cooling, can effectively take away heat, reduce the thermal elongation of the main shaft, greatly shorten the warm-up time of the main shaft, and improve the machining efficiency and accuracy of the machine tool. The technical solution of the present utility model adopts a detachable cooling module for the shaft core cooling cycle of the main shaft, which is independent of the structure of the main shaft itself, and has the characteristics of simple structure, high stability, convenient installation and disassembly. The present utility model can be applied to various applications of high / low speeds of the main shaft, can withstand a large cooling water pressure, and has a good cooling effect.

[0018] The additional aspects and advantages of the present utility model will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present utility model. Description of the Drawings

[0019] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0020] Figure 1 is a schematic structural diagram of an embodiment of the shaft core cooling assembly of the present utility model;

[0021] Figure 2 is a schematic structural diagram of the use state of an embodiment of the shaft core cooling assembly of the present utility model;

[0022] Figure 3 is a schematic structural diagram of the skeleton oil seal and the first air flow channel of an embodiment of the shaft core cooling assembly of the present utility model;

[0023] Figure 4 is a schematic structural diagram of the cooperation structure of the protective cover and the bearing gland of an embodiment of the shaft core cooling assembly of the present utility model;

[0024] Figure 5 is a schematic structural diagram of an embodiment of the transmission component of the present utility model. Detailed Embodiments

[0025] This part will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the drawings. The role of the drawings is to supplement the description of the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but it cannot be understood as a limitation on the protection scope of the present utility model.

[0026] In the present utility model, if there is a description of directions (up, down, left, right, front and back), it is only for the convenience of describing the technical solution of the present utility model, rather than indicating or implying that the technical features referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation on the present utility model.

[0027] In the present utility model, the meaning of "several" is one or more, the meaning of "multiple" is two or more, and "greater than", "less than", "exceeding", etc. are understood as not including the present number; "above", "below", "within", etc. are understood as including the present number. In the description of the present utility model, if there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated or the sequence relationship of the technical features indicated.

[0028] In the present utility model, unless otherwise clearly defined, terms such as "arranged", "installed", and "connected" shall be understood in a broad sense. For example, they can be directly connected, or indirectly connected through an intermediate medium; they can be fixedly connected, or detachably connected, or integrally formed; they can be mechanically connected, or electrically connected or capable of communicating with each other; they can be the connection inside two components or the interaction relationship between two components. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present utility model in combination with the specific content of the technical solution.

[0029] Among them, Figure 2 A reference direction coordinate system for the embodiments of the present utility model is given. The following will describe the embodiments of the present utility model in conjunction with Figure 2 the directions shown.

[0030] The embodiments of the present utility model provide a shaft core cooling assembly, which can be used for cooling the shaft core of a main shaft.

[0031] Referring to Figure 1 , the shaft core cooling assembly includes a body component 100 and a shaft core component 200. The shaft core component 200 is supported on the body component 100 through a bearing 300. The shaft core component 200 can rotate around an axis in the body component 100. The shaft core cooling assembly forms an independent assembly that can be disassembled and assembled on the main shaft. The shaft core component 200 extends from a first end 201 to a second end 202 along the axial direction. A connection end face 203 for connecting with the shaft core of the main shaft is formed at the second end 202 of the shaft core component 200. The shaft core component 200 is provided with a cooling flow channel extending to the connection end face 203, and the body component 100 is provided with a cooling interface communicated with the cooling flow channel.

[0032] Combined with Figure 1 , the technical solution of the present utility model provides a detachable cooling module for cooling the shaft core of a main shaft. When in use, the shaft core cooling assembly is installed on the main shaft, the shaft core component 200 is connected to the shaft core of the main shaft, and the shaft core coolant flows from the cooling interface through the body component 100 into the cooling flow channel of the shaft core component 200. The coolant advances axially along the cooling flow channel, flows through the shaft core, realizes shaft core cooling, can effectively take away heat, reduce the thermal elongation of the main shaft, greatly shorten the warm-up time of the main shaft, and improve the processing efficiency and accuracy of the machine tool. The technical solution of the present utility model adopts a detachable cooling module for the shaft core cooling cycle of the main shaft, which is independent of the structure of the main shaft itself and has the characteristics of simple structure, high stability, and convenient installation and disassembly. The present utility model can be applied to various applications of high / low speeds of the main shaft, can withstand a large cooling water pressure, and has a good cooling effect.

[0033] In some embodiments, the coolant flowing in from the shaft core cooling assembly cools the shaft core by flowing unidirectionally through the shaft core in the cooling flow path, that is, after the coolant flows in from the shaft core cooling assembly and through the shaft core, it then flows out of the shaft core, effectively taking away heat.

[0034] In some embodiments, the coolant flowing in from the shaft core cooling assembly cools by flowing through the shaft core in a circulating manner in the cooling flow path. Refer to Figure 1 , Figure 2 , the cooling flow path includes an inlet cooling flow path 204 and a return cooling flow path 205, and the cooling interfaces include an inlet cooling interface 101 communicating with the inlet cooling flow path 204 and a return cooling interface 102 communicating with the return cooling flow path 205. The shaft core coolant flows from the inlet cooling interface 101 through the body component 100 into the cooling flow path of the shaft core component 200. The coolant advances axially along the cooling flow path, flows through the inner hole of the shaft core 400, and converges at the lower side. Multiple circulating axial holes are opened at the lower side of the shaft core 400, and the multiple circulating axial holes converge with the cooling flow path. After convergence, it flows axially along the shaft core component 200, continues to flow to the body component 100, and finally flows out through the return cooling interface 102, completing a cooling cycle operation of one inlet and multiple outlets. In this embodiment, circulating cooling is adopted, and the coolant can come into contact and exchange heat with the shaft core more fully, greatly improving the use effect of the machine. At the same time, through the structural form of circulating cooling, both the inlet cooling interface 101 and the return cooling interface 102 can be arranged on the body component 100, the structure is more concise, the stability is higher, and the installation and disassembly are more convenient.

[0035] Furthermore, refer to Figure 1 , the inlet cooling flow path 204 penetrates from the first end 201 to the second end 202 of the shaft core component 200 along the axis of the shaft core component 200. The first end 201 of the shaft core component 200 is axially inserted into the interior of the body component 100. The inlet cooling interface 101 is opened on the body component 100 corresponding to the first end 201 of the shaft core component 200. The inlet cooling interface 101 is communicated with the port of the inlet cooling flow path 204 at the first end 201 of the shaft core component 200. The coolant entering from the inlet cooling interface 101 can be directly introduced into the inlet cooling flow path 204 of the rotating shaft core component 200.

[0036] Refer to Figure 1 , the return cooling flow path 205 is located on the side of the inlet cooling flow path 204. The return cooling flow path 205 extends from the second end 202 of the shaft core component 200 towards the first end 201. A conversion sleeve 500 is provided on the outside of the first end 201 of the shaft core component 200 on the body component 100. A ring groove 501 communicating with the return cooling flow path 205 is provided between the conversion sleeve 500 and the shaft core component 200. The return cooling interface 102 is communicated to the ring groove 501. The ring groove 501 can be provided with one or more layers. For example, in Figure 1 , Figure 2In the illustrated embodiment, the coolant circulating back along the liquid return cooling channel 205 flows axially along the shaft core component 200 and continues to flow to the conversion sleeve 500. The conversion sleeve 500 flows in multiple layers to the body component 100 and flows out through the liquid return cooling interface 102, completing the cooling cycle work of one input and multiple outputs.

[0037] Through actual testing of the main shaft, this structure can reduce the temperature rise by 90%, reduce the thermal elongation of the main shaft by more than 80%, and shorten the thermal stability time from the original 20 minutes to 3 minutes, which can greatly improve the use effect of the machine tool and has excellent application and promotion value.

[0038] In some embodiments, referring to Figure 1 、 Figure 3 , the body component 100 includes a bearing housing located at the second end 202 of the shaft core component 200. The second end 202 of the shaft core component 200 is supported by the bearing housing of the body component 100 through a bearing 300. The body component 100 is provided with a skeleton oil seal 600 between the bearing 300 and the conversion sleeve 500. The skeleton oil seal 600 is matched with the outer peripheral surface of the shaft core component 200, and the skeleton oil seal 600 forms a first liquid storage tank 601 on the side facing the conversion sleeve 500.

[0039] Referring to Figure 3 , since the shaft core component 200 rotates at a high speed with the main shaft, and the conversion sleeve 500 is a fixed part, there is a certain gap between the shaft core component 200 and the conversion sleeve 500. Therefore, while the coolant circulates along parts such as the shaft core component 200 and the conversion sleeve 500, it will leak along the gap between the shaft core component 200 and the conversion sleeve 500. After leakage, it will be caught by the first liquid storage tank 601 of the skeleton oil seal 600, which can effectively prevent the coolant from continuing to leak downward into the lower bearing 300 chamber and further polluting the bearing 300, affecting the service life of the bearing 300 of the cooling module.

[0040] Furthermore, referring to Figure 3 , the body component 100 is provided with a first air flow channel 103 communicating between the skeleton oil seal 600 and the conversion sleeve 500. In this embodiment, an overflow gas protection structure is designed. The protective gas enters from the gas protection joint, passes through the body component 100 and enters between the skeleton oil seal 600 and the conversion sleeve 500, and forms a positive pressure chamber in this area. Since the coolant leaking from the gap between the shaft core component 200 and the conversion sleeve 500 has no pressure, the positive pressure area will effectively reduce the risk of coolant leakage between the shaft core and the conversion sleeve 500.

[0041] In addition to designing the coolant overflow protection structure, a gas seal protection structure is also designed. Referring to Figure 1 、 Figure 4, in some embodiments, a bearing gland 700 that axially abuts against the inner ring of the bearing 300 is provided between the shaft core component 200 and the skeleton oil seal 600. A protective cover 800 is provided on the outer side of the bearing gland 700 of the body component 100. A labyrinth seal structure is formed between the protective cover 800 and the bearing gland 700. The protective cover 800 is provided with a pressure equalizing groove 801 and a radial hole 802 communicating with the pressure equalizing groove 801 at the labyrinth seal structure. The body component 100 is provided with a second air flow channel 803 extending to the radial hole 802. A second liquid storage tank 804 is provided between the protective cover 800 and the body component 100. The body component 100 is provided with an overflow hole 104 communicating with the second liquid storage tank 804.

[0042] See Figure 1 、 Figure 4 , the air seal protection gas enters from the air seal joint, passes through the second air flow channel 803 of the body component 100 and enters the protective cover 800. The protective cover 800 is provided with a radial hole 802 and a pressure equalizing groove 801. The air seal protection gas enters the pressure equalizing groove 801 between the shaft core and the protective cover 800 to form a positive pressure gas that continuously and evenly sprays outwards. This gas can effectively prevent various foreign objects from entering the installation area of the bearing 300 through the gap between the bearing gland 700 and the protective cover 800 and polluting the bearing 300.

[0043] See Figure 4 , since the skeleton oil seal 600 cannot block all the non-pressure coolant leaking from the gaps between the shaft core component 200 and the conversion sleeve 500 during sealing, a small amount of coolant will overflow downward along the inside of the shaft core component 200. The excess coolant is centrifugally thrown onto the body component 100 at high speed along with the shaft core component 200 and flows down along the inner wall of the body component 100. A second liquid storage tank 804 is formed between the protective cover 800 and the body component 100. The excess coolant accumulates in the second liquid storage tank 804. A radial overflow hole is opened at the lower part of the body component 100, and the excess coolant is discharged along the overflow joint from the overflow hole.

[0044] In some embodiments, see Figure 1 、 Figure 5 , a transmission component 900 is provided at the second end 202 of the shaft core component 200. One side of the transmission component 900 axially abuts against the inner ring of the bearing 300, and a transmission structure 901 for connecting with the shaft core of the main shaft is provided on the other side of the transmission component 900. The transmission structure can adopt a boss, a concave hole, etc. The transmission structure can be embedded and fitted with the shaft core of the main shaft to achieve synchronous high-speed rotation.

[0045] The shaft core cooling assembly can be detachably connected to the main shaft by means of threads, pins, bolts, etc. In some embodiments, see Figure 1, at a position close to the second end 202 of the shaft core component 200, the body component 100 is provided with a connecting seat 105. The connecting seat 105 is provided with fastening connecting pieces 106 for connecting with the body of the main shaft. The fastening connecting pieces 106 are used for locking to fix the shaft core cooling component to the body to complete the fixation of the cooling module. Among them, a plurality of fastening connecting pieces are distributed along the circumferential direction of the body component 100 to ensure the connection stability between the shaft core cooling component and the main shaft and avoid coolant leakage.

[0046] An embodiment of the present utility model further provides a main shaft, including the shaft core cooling component in any one of the above embodiments.

[0047] An embodiment of the present utility model further provides a machine tool, including the main shaft in any one of the above embodiments.

[0048] In the description of this specification, the description with reference to terms such as "example", "embodiment" or "some embodiments" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0049] Certainly, the creation of the present utility model is not limited to the above embodiments. Those skilled in the art can also make equivalent deformations or replacements without departing from the spirit of the present utility model, and these equivalent deformations or replacements are all included in the scope defined by the claims of this application.

Claims

1. A shaft core cooling assembly, characterized in that: It includes a body component and an axial core component, the axial core component is supported on the body component by a bearing, the axial core cooling assembly forms an independent assembly that can be disassembled and assembled on the main shaft, the axial core component extends axially from the first end to the second end, the second end of the axial core component forms a connecting end face for connecting to the axial core of the main shaft, the axial core component is provided with a cooling channel extending to the connecting end face, and the body component is provided with a cooling interface connected to the cooling channel.

2. The shaft core cooling assembly according to claim 1, characterized in that: The cooling channel includes a liquid inlet cooling channel and a liquid return cooling channel, and the cooling interface includes a liquid inlet cooling interface communicating with the liquid inlet cooling channel and a liquid return cooling interface communicating with the liquid return cooling channel.

3. The shaft core cooling assembly according to claim 2, characterized in that: The liquid inlet cooling channel passes through from the first end of the shaft core component to the second end along the axis of the shaft core component, the liquid inlet cooling interface is connected to the port of the liquid inlet cooling channel at the first end of the shaft core component, the liquid return cooling channel extends from the second end of the shaft core component toward the first end, the body component is provided with a conversion sleeve on the outer side of the first end of the shaft core component, an annular groove connected to the liquid return cooling channel is provided between the conversion sleeve and the shaft core component, and the liquid return cooling interface is connected to the annular groove.

4. The shaft core cooling assembly according to claim 3, characterized in that: The second end of the shaft core component is supported on the body component through a bearing. The body component is provided with a skeleton oil seal between the bearing and the conversion sleeve. The skeleton oil seal cooperates with the outer peripheral surface of the shaft core component. The skeleton oil seal forms a first liquid storage tank on the side facing the conversion sleeve.

5. The shaft core cooling assembly according to claim 4, characterized in that: The body component is provided with a first air flow channel connected to the skeleton oil seal and the conversion sleeve.

6. The shaft core cooling assembly according to claim 4, characterized in that: The shaft core component is provided with a bearing pressure cover between the bearing and the skeleton oil seal, which is axially against the inner ring of the bearing; the body component is provided with a protective cover on the outer side of the bearing pressure cover; a labyrinth sealing structure is formed between the protective cover and the bearing pressure cover; the protective cover is provided with a pressure equalizing groove and a radial hole connected to the pressure equalizing groove at the labyrinth sealing structure; the body component is provided with a second air flow channel extending to the radial hole; a second liquid storage tank is provided between the protective cover and the body component; and the body component is provided with an overflow hole connected to the second liquid storage tank.

7. The shaft core cooling assembly according to claim 6, characterized in that: A transmission component is provided at the second end of the shaft core component, one side of the transmission component abuts against the inner ring of the bearing along the axial direction, and the other side of the transmission component is provided with a transmission structure for connecting with the shaft core of the main shaft.

8. The shaft core cooling assembly according to claim 1, characterized in that: The body component is provided with a connection seat at a position close to the second end of the shaft core component, and the connection seat is provided with a fastening connector for connecting with the body of the main shaft, and a plurality of the fastening connectors are distributed along the circumference of the body component.

9. A spindle, characterized in that: The invention comprises the core cooling assembly according to any one of claims 1 to 8.

10. A machine tool, characterized in that: Comprising the main shaft as claimed in claim 9.

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