WO2023005087A1

WO2023005087A1 - Cutter switching structure, cutter assembly, processing apparatus, and machine tool

Info

Publication number: WO2023005087A1
Application number: PCT/CN2021/134492
Authority: WO
Inventors: 颜炳姜; 李伟秋; 张国立
Original assignee: 科益展智能装备有限公司; 汇专科技集团股份有限公司; 科益展智能装备有限公司广州分公司
Priority date: 2021-07-28
Filing date: 2021-11-30
Publication date: 2023-02-02
Also published as: CN215902741U

Abstract

A cutter switching structure (1), a cutter assembly, a processing apparatus, and a machine tool. The cutter switching structure (1) comprises a toolholder switching portion (12) used for being connected to a toolholder (3) and a cutter clamping portion (13) connected to a cutter (2); the cutter switching structure (1) is provided with a plurality of axially-penetrating first internal cooling channels (14); and the cutter clamping portion (13) is provided with an axially-extending cutter clamping hole (11), the cutter clamping hole (11) being used for clamping the handle of the cutter, and the inner diameter of the cutter clamping hole (11) being configured to match the outer diameter of the handle of the cutter (2). The internal cooling channels are provided in the cutter switching structure, so that the processing difficulty of the toolholder is reduced; and internal cooling channels for processing provided in the toolholder are reduced, so that the stiffness and strength of the toolholder are further improved. When replacing a cutter, the toolholder no longer needs to be replaced, and the cutter switching structure is formed into a standardized and universal structure, such that quick cutter replacement is implemented, and the cost of toolholder replacement is reduced; the cooling efficiency of the cutter is improved, so that the cutter can be quickly and stably connected to the toolholder.

Description

Tool transfer structure, tool assembly, processing device and machine tool

technical field

The utility model relates to the field of machine tool processing, in particular to a cutter transfer structure, a cutter assembly, a processing device and a machine tool.

Background technique

At present, in the field of machine tool processing technology, on the basis of the principle of thermal expansion and contraction, the tool holder and the tool can be connected by interference fit through thermal expansion and contraction. After the tool is connected to the tool holder, it needs to be cooled by coolant so that the tool is firmly connected to the tool holder. In the conventional technology, an internal cooling channel is provided on the tool holder, and the internal cooling channel is arranged along the axial direction of the tool holder, and is close to the inner wall of the tool holding hole on the tool holder, so that the cooling medium (air/liquid) can quickly set the tool Shank and tool are cooled. However, if the tool needs to be changed, the tool handle needs to be removed to heat the tool handle, and the tool is removed from the tool handle. This method increases the tool replacement time and cannot achieve fast tool change. If a new Knife handles and knives increase production costs.

Utility model content

In order to overcome at least one of the defects in the prior art, the purpose of this utility model is to provide a tool transfer structure, a tool assembly, a processing device and a machine tool, which solve the high cost of tool holder replacement and the time required for tool replacement proposed in this application. long question.

The purpose of this application adopts following technical scheme to realize:

An embodiment of the present application provides a tool transfer structure, including a tool handle transfer part used to connect with the tool handle and a tool clamping part connected to the tool. The transfer structure is provided with a number of axially penetrating first The internal cooling channel, the tool holding part is provided with an axially extending tool holding hole, the tool holding hole is used to hold the shank of the tool, and the inner diameter of the tool holding hole is used to match the shank of the tool Match the outside diameter.

Optionally, several first internal cooling passages are evenly distributed outside the tool holding hole along the circumference, and the first internal cooling passages are used to transmit lubricating medium and/or cooling medium.

Optionally, the tool holding hole is a blind hole or a through hole.

Optionally, the tool holding hole is a through hole, and the first internal cooling channel is a groove uniformly arranged in the circumferential direction and extending axially on the inner peripheral surface of the holding hole, and the opening of the groove faces inside the clamping hole.

Optionally, the shape of the groove along the radial cross-section is any one of V-shape, U-shape, and arc shape.

Optionally, the shape of the first internal cooling passage along the radial cross-section is any one of triangle, strip and circle.

Optionally, the hole wall at the rear end of the clamping hole is further provided with a vent hole radially penetrating through the tool transition structure and located at the rear end of the tool rear end face.

Optionally, the end surface of the tool clamping portion is a conical surface, and the side of the conical surface with a smaller diameter is close to the tool holder transfer portion.

Optionally, the end surface of the tool clamping portion is a conical surface, and the side of the conical surface with a smaller diameter is away from the tool holder transfer portion.

Optionally, the inner diameter of the tool holding hole is 3-32mm.

Optionally, the inner diameter of the tool holding hole is 4mm, 6mm, 8mm or 10mm.

The embodiment of the present application also provides a cutter assembly, including a cutter and the cutter transfer structure according to any embodiment of the present application, and the cutter is fixedly installed in the cutter holding hole.

Optionally, the tool is installed in the tool holding hole in a shrink-fit manner.

Optionally, the tool is provided with a second internal cooling passage along the axial direction.

The embodiment of the present application also provides a processing device, including a knife handle and a tool assembly according to any embodiment of the present application, the knife handle is connected to the knife handle adapter, and the knife handle is axially opened with a The internal cooling through hole connected to the first internal cooling channel.

The embodiment of the present application also provides a machine tool, including a machine tool body, a spindle arranged on the machine tool body, and the processing device provided in the embodiment of the present application connected to the spindle.

The application provides a tool transfer structure, a tool assembly, a processing device, and a machine tool. The tool transfer structure includes a first end tool handle transfer part for connecting with a tool handle and a first end tool handle transfer part for connecting with a tool handle. The tool holding part of the two-end tool holding part, the transfer structure is provided with a number of first internal cooling passages axially penetrating from the first end to the second end, and the second end of the tool holding part holds the tool The upper part is provided with an axially extending tool holding hole for holding the shank of the tool, and the inner diameter of the tool holding hole is used to match the outer diameter of the shank of the tool. Since the internal cooling channel is set on the tool transfer structure, the processing difficulty of the tool holder is reduced, and the rigidity and strength of the tool holder are improved due to the reduction of the internal cooling channel processed on the tool holder. When changing the tool, it is no longer necessary to change the tool handle. The tool transfer structure forms a standardized and universal structure, which realizes quick tool change, reduces the replacement cost of the tool handle, achieves the purpose of prolonging the tool life, and solves the problem of difficult machining in the industry. Metal cutting puzzles.

Description of drawings

Fig. 1 is the structural representation of a kind of cutter assembly of the present application;

Fig. 2 is the sectional view of A-A among Fig. 1;

Fig. 3 is an axial sectional view of another embodiment of a tool assembly of the present application, mainly showing that the clamping hole is a through hole, the end surface of the tool clamping part is a conical surface, and the side of the conical surface has a smaller diameter away from the handle adapter;

Fig. 4 is a right view of the tool transfer structure in Fig. 1;

Fig. 5 is a left view of an embodiment of the tool transfer structure in the embodiment of the present application;

Fig. 6 is a left view of an embodiment of the tool transfer structure in the embodiment of the present application, mainly showing that the groove of the first internal cooling channel is an arc-shaped groove;

Fig. 7 is a left view of an embodiment of the tool transfer structure in the embodiment of the present application, mainly showing that the groove of the first internal cooling channel is a V groove;

Fig. 8 is a left view of an embodiment of the tool transfer structure in the embodiment of the present application, mainly showing that the groove of the first internal cooling channel is a U groove;

Fig. 9 is a left view of the tool assembly in Fig. 1, mainly showing that the groove of the first internal cooling channel is a strip hole;

Fig. 10 is a left view of the cutter assembly in Fig. 1, mainly showing that the groove of the first internal cooling channel is a triangular hole;

Figure 11 is a front view of a processing device in the present application;

Fig. 12 is an axial sectional view of a processing device in the present application;

Among them, 1. tool transfer structure; 11. clamping hole; 12. tool handle transfer part; 13. tool clamping part; 14. first internal cooling channel; 15. vent hole; 16. groove; 131. Inner edge; 2. Tool; 3. Tool handle; 4. Cooling medium and/or lubricating medium channel.

Detailed ways

Below, the utility model will be further described in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, on the premise of not conflicting, the various embodiments or technical features described below can be combined arbitrarily to form new implementations. example.

In the description of this application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", The orientations or positional relationships indicated by "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the application and simplifying the description, rather than indicating or implying References to devices or elements must have a particular orientation, be constructed, and operate in a particular orientation and therefore should not be construed as limiting the application. Wherein, "front" refers to the end close to the workpiece when the high-frequency ultrasonic toolholder in this embodiment is used for processing, and "rear" refers to the end away from the workpiece.

The terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present application, unless otherwise specified, "plurality" means two or more.

It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element, or there can also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may be present.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by a person skilled in the technical field of the present invention. The terms used in the description of the utility model herein are only for the purpose of describing specific embodiments, and are not intended to limit the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to Fig. 1 to Fig. 7, the embodiment of the present application provides a tool adapter structure 1, which includes a tool handle adapter part 12 connected to the tool handle and a tool clamping part 13 connected to the tool 2, namely The transfer structure 1 is clamped by the tool handle 3, and the transfer structure 1 can also clamp the tool to realize the connection between the tool and the tool handle. The adapter structure 1 is uniformly provided with a first internal cooling passage axially penetrating from the tool holder adapter portion 12 to the tool clamping portion 13 along the circumferential direction, so that when the tool 2 is connected to the adapter structure 1, the first inner cooling channel can pass through the first inner cooling passage. The cold channel sprays cooling medium and/or lubricating medium to the tool head and the processing area.

The handle adapter part 11 of the adapter structure 1 can be in contact with the horn inside the handle; or it can be in contact with the end face of the adjustment part exposed to the extended tool inside the handle, and the efficiency of the adjustment part is on the side of the transfer structure. When a tapered surface is provided on the end face of the cavity, the chamfered part of the transfer structure shank transfer part 11 is in contact with the tapered surface, thereby reducing the accumulation of cooling medium at the transfer part of the transfer structure shank and improving cooling. Transmission efficiency of media and/or lubricating media. The end face of the horn and the end face of the fitting will not interfere with the first internal cooling channel of the transition structure, so that the cooling medium and/or lubricating medium can be transmitted through the first internal cooling channel 14 . It should be noted that, in the embodiments provided in this application, the cooling medium includes: cooling liquid, water, carbon dioxide, nitrogen, air, etc., and the lubricating medium includes oil mist, etc.

In one embodiment provided by the present application, as shown in FIGS. Outside the tool holding hole 11, the ring spray and internal cooling of the tool can be realized. The tool holding hole 11 can be processed into any diameter according to the outer diameter of the tool to be connected, so as to match the outer diameter of the tool, so as to be suitable for clamping tools with different outer diameters, and then the shank of the tool can be inserted into the In the clamping hole 11 , the connection between the tool 2 and the adapter structure 1 is realized. In order to ensure the stability of the tool connection, the tool 2 and the transition structure 1 are connected by an interference fit in this embodiment. Optionally, the principle of thermal expansion and contraction can be adopted. After heating the handle of the tool 2 and the transition structure, the tool 2 is assembled into the clamping hole 11 of the transition structure 1, and then the first internal cooling channel A cooling medium is input in 14 to cool the transfer structure 1 and the tool 2, thereby realizing a stable connection between the tool 2 and the transfer structure 1.

The tool transfer structure with internal cooling ring spray provided by the embodiment of the present application solves the problem of short tool life for processing difficult-to-machine metal materials, adopts the cooling and lubrication method of ring spray on the tool edge, and the gas/liquid spray distance Closer to the cutting zone, the effect of cooling and lubrication is more significant, extending tool life and reducing surface roughness. This structure can shorten the length of the tool material, greatly reduce the manufacturing cost of the tool without changing the tool life, and is conducive to environmental protection and mass application and promotion.

Referring to Figures 2 to 5, in order to quickly cool the transfer structure 1 and the cutting tool 2, several first internal cooling channels 14 are evenly distributed outside the tool holding hole 11, and this method also makes the transfer structure 1 and the cutting tool 2 The stress on each part is consistent, thereby ensuring the rigidity and strength of the transfer structure 1 and the tool 2, reducing the damage caused by thermal expansion and contraction to the transfer structure 1 and the tool 2, and improving the use of the transfer structure 1 and the tool 2 life.

Preferably, as shown in FIG. 2 , the tool holding hole 11 is a blind hole, and the hole wall at the rear end of the tool holding hole 11 is also provided with a vent hole 15 that radially penetrates the tool transfer structure 1 and is not blocked by the tool 2, namely The ventilation hole 15 is located at the rear end of the rear end face of the tool 2 . The vent hole 15 is used to discharge the gas at the rear end of the blind hole when the cutter 2 is assembled into the clamping hole 11, and reduce the pressure in the vent hole 15, so that the cutter can be assembled in place, thereby ensuring the length of the cutter 2 connection and ensuring that the cutter stability.

Preferably, in order to achieve rapid cooling of the tool, in one embodiment, the first internal cooling passage is an axially extending groove in the clamping hole section, the opening of the groove faces into the tool clamping hole, and in the tool shank When connected with the adapter, the wall surface opposite to the groove on the inner peripheral surface of the adapter and the wall of the groove together form a circumferentially closed first internal cooling channel, and the cooling medium and/or lubrication are transmitted in the first internal cooling channel Medium, and then can realize the direct contact between the cooling medium and/or lubricating medium and the shank of the tool, so that the heat of the tool shank can be quickly transferred to the cooling medium and/or lubricating medium, and can also cool the transfer structure, Make cooling more efficient.

In one embodiment, when the tool holding hole is a blind hole, the length of the groove is consistent with the length of the tool shank, and the first internal cooling passage not located in the holding hole section and the concave hole located in the holding hole section The grooves are connected, and the grooves are evenly distributed in the circumferential direction of the tool shank to ensure that the clamping hole walls between the grooves can be stably clamped on the tool shank to ensure the stability of the tool connection. In yet another embodiment, with reference to Fig. 3, the tool holding hole 11 is a through hole of the same diameter, so that when the tool is installed, the gas can be discharged from the rear end of the channel, and the pressure in the channel is relatively balanced. The hole wall at the rear end can also be provided with a vent hole that radially penetrates the tool transfer structure and is not blocked by the tool, and the vent hole does not interfere with the first internal cooling passage, so as to ensure the strength and rigidity of the tool transfer structure. In order to ensure the cleanliness of the tool holding hole and reduce the accumulation of dirt, when the tool holding hole is a through hole, the length of the tool holding hole is equivalent to the length of the tool shank, so as to realize the circumferential protection of the entire groove. completely closed.

In the embodiment provided by the present application, referring to Fig. 6-8, when the clamping hole 11 is a through hole, the groove 16 axially penetrates the entire clamping hole 11, and the shape of the groove 16 along the radial section is V-shaped, Make the cooling medium and/or lubricating medium have a larger contact area with the knife, so that the temperature of the surface of the tool clamping structure 1 clamping the tool and the surface of the tool can be reduced more efficiently, ensuring the cooling effect; in another embodiment, the The shape of the groove along the radial section is U-shaped; in another embodiment, the shape of the groove along the radial section is arc-shaped, so as to cool the tool connecting section 11 more rapidly in the radial direction. outermost part. It should be noted that when the clamping hole 11 is a blind hole, the first internal cooling channel is only a groove 16 in the section of the tool clamping hole 11

In the embodiment provided by this application, referring to Fig. 5, Fig. 9 and Fig. 10, when the first internal cooling passage 14 is a through hole, the shape of the first internal cooling passage 14 along the radial section is triangular, and the bottom of the triangle Facing the tool holding hole, the temperature of the surface clamped by the tool holding structure and the surface of the tool can be lowered more efficiently and the cooling effect can be guaranteed. In yet another embodiment, the shape of the first internal cooling passage 14 along the radial cross-section is strip-shaped. In yet another embodiment, the shape of the first inner cooling channel 14 is circular in cross-section along the radial direction.

In yet another embodiment, referring to Fig. 1 , Fig. 2 and Fig. 5, the end face of the tool clamping portion 13 is a conical surface, and the side of the conical surface with a smaller diameter is close to the tool holder transfer portion 12, that is, the tool holder The inner edge 131 of the holding part 13 is closer to the tool handle transfer part 11 than the outer edge, so that the end surface of the tool holding part 13 forms an inclined surface inclined to the inside of the holding hole 11, thereby limiting the spraying of the first internal cooling channel 14. The spraying range of the coolant makes the coolant in the first internal cooling channel 14 can be sprayed mostly into the cutting tool and the processing area of the cutting tool, so as to cool and lubricate the cutting tool head and the processing area more effectively, and reduce the cooling effect at the same time. Waste of liquid or minimum quantity lubrication medium.

In yet another embodiment, referring to FIG. 3 and FIG. 6 , the end surface of the tool clamping portion 13 is a conical surface, and the side of the conical surface with a smaller diameter is far away from the tool holder transfer portion 12 , that is, the tool clamping portion 13 The inner edge 131 of the inner edge 131 is farther away from the tool handle adapter portion 11 relative to the outer edge, so that the end surface of the tool holding portion 13 forms an inclined surface inclined to the outside of the holding hole 11, so that the tool holding portion of the adapter structure can form a Grinding surface is convenient for processing the tool holding part of the transfer structure.

In the embodiments provided in the present application, the outer diameter of the adapter structure matches the cavity of the tool holder, and the inner diameter of the clamping hole section of the adapter structure can be designed and processed according to different sizes of tools. In another embodiment, the outer diameter of the transition structure is 3-32mm, preferably, the inner diameter of the transition structure is 4mm, 6mm, 8mm or 10mm, which is used to cooperate with the handle of the tool to realize the transition structure Standardization to form standard parts for matching with tools of different diameters. When changing the tool, it is only necessary to remove the tool and the transfer structure from the tool handle together, avoiding the replacement of the tool handle, and then making the tool transfer structure in this embodiment a standardized and generalized structure, when changing the tool , then there is no need to replace the tool holder, thereby reducing the replacement cost of the tool holder.

The embodiment of the present application also provides a cutter assembly, referring to FIGS. 1 to 3 and FIGS. 9 and 10 , including a cutter 2 and a cutter transfer structure 1 according to any embodiment of the present application. As mentioned above, the cutter transfer structure 1 A tool holding hole 11 is provided, and the tool 2 is fixedly installed in the tool holding hole 11 to ensure the stability of the connection between the tool 2 and the tool transfer structure 1 . Optionally, the tool 2 is installed in the tool holding hole 11 in a heat-fitting manner, and is assembled and connected using the principle of thermal expansion and contraction to improve the accuracy of the connection. Optionally, the tool is provided with a second internal cooling channel (not shown) in the axial direction, which improves cooling and/or lubricating efficiency. It should be noted that when the first internal cooling channel opened on the tool transfer structure is a through hole, the second internal cooling channel is a through hole opened on the tool handle along the axial line, or the second internal cooling channel is opened The groove on the tool shank is recessed along the radial direction of the tool shank, and extends linearly on the peripheral surface of the tool shank, or extends helically around the axis.

The embodiment of the present application also provides a processing device, referring to Fig. 11 and Fig. 12, including a tool handle 3 and a tool assembly 1 according to any embodiment of the present application, the front end of the tool handle 3 is provided with a fixing hole, and the tool transfer structure 1 The knife handle adapter 13 is disposed in the fixing hole, wherein the knife handle can be a heat-shrinkable knife handle, or a conventional knife handle with a sealing assembly. The fixing holes, such as the connection holes on the collet and nut connected to the tool adapter structure 1, can also be the clamping holes at the front end of the heat-shrinkable handle. In combination with the foregoing, it can be seen that through the embodiments provided by the present application, in order to realize internal cooling, there are axially connected through holes inside the tool handle, such as pull studs, tool handle bodies, horns, collets, etc., after turning the tool 2 When the connecting structure is installed in the fixing hole of the tool handle 3, a channel 4 for transmitting cooling medium and/or lubricating medium can be provided inside the through hole of the tool handle 3. When replacing the tool 2, it is only necessary to remove the tool 2 and the tool adapter structure 1 from the handle without replacing the tool handle 3, and install the additionally connected tool adapter structure 1 and tool 2 to the handle 3, the tool transfer structure 1 forms a standardized and universal structure, which realizes quick tool change and reduces the replacement cost of the tool holder. At the same time, the processing difficulty of the tool holder is reduced, and the rigidity and strength of the tool holder are improved due to the reduction of internal cooling channels processed on the tool holder.

It should be noted that Fig. 11 and Fig. 12 are structural schematic diagrams of clamping the tool 2 and the tool adapter structure 1 in Fig. 3 onto the handle 3, and the situation of clamping the tool transfer structure 1 on the handle in other embodiments It is not shown in the figure, but those skilled in the art can realize and implement it on the basis of the detailed description of the present application and the accompanying drawings.

In yet another embodiment, the front end of the channel is threadedly connected to the rear end of an adjustment member, and a micro-lubricating medium transmission cavity is provided at the front end of the adjustment member, and the surrounding wall and end surface of the cavity will not interfere with the first internal cooling channel, thereby ensuring The minimum amount of lubrication medium can be quickly transferred to the first internal cooling channel, avoiding the accumulation of the minimum amount of lubrication medium (such as oil mist) at the rear end of the transfer structure, and improving the transmission efficiency of the minimum amount of lubrication medium.

The embodiment of the present application also provides a machine tool, including a machine tool body, a spindle disposed on the machine tool body, and the tool clamping device described in the embodiments of the present application connected to the spindle.

The above-mentioned embodiments are only preferred embodiments of the present utility model, and cannot be used to limit the scope of protection of the present utility model. The scope of protection required by the utility model.

Claims

A tool transfer structure, characterized in that it includes a tool handle transfer part used to connect with the tool handle and a tool clamping part connected with the tool, the transfer structure is provided with a number of axially penetrating first internal cooling channel, the tool holding part is provided with an axially extending tool holding hole, the tool holding hole is used to hold the shank of the tool, and the inner diameter of the tool holding hole is used to match the outer diameter of the shank of the tool diameter matches.
The tool adapter structure according to claim 1, characterized in that, several of the first internal cooling passages are evenly distributed outside the tool holding hole in the circumferential direction, and the first internal cooling passages are used to transmit Lubricating medium and/or cooling medium.
The tool adapter structure according to claim 1, wherein the tool holding hole is a blind hole or a through hole.
The tool adapter structure according to claim 1, wherein the tool holding hole is a through hole, and the first internal cooling channel is uniformly arranged in the upper direction of the inner peripheral surface of the holding hole and axially A groove extending toward the inside of the clamping hole.
The tool adapter structure according to claim 4, characterized in that, the shape of the radial section of the groove is any one of V-shape, U-shape, and arc shape.
The tool adapter structure according to claim 1, characterized in that, the shape of the radial section of the first internal cooling channel is any one of triangle, strip and circle.
The tool transfer structure according to claim 3, characterized in that, the hole wall at the rear end of the clamping hole is further provided with a vent hole radially penetrating through the tool transfer structure and located at the rear end of the rear end surface of the tool.
The tool adapter structure according to claim 1, wherein the end surface of the tool clamping portion is a conical surface, and the side of the conical surface with a smaller diameter is close to the tool handle adapter portion.
The tool adapter structure according to claim 1, wherein the end surface of the tool clamping portion is a conical surface, and the side of the conical surface with a smaller diameter is away from the tool handle adapter portion.
The tool adapter structure according to claim 1, characterized in that, the inner diameter of the tool holding hole is 3-32 mm.
The tool adapter structure according to claim 1, wherein the inner diameter of the tool holding hole is 4mm, 6mm, 8mm or 10mm.
A cutter assembly, characterized in that it comprises a cutter and the cutter transfer structure according to any one of claims 1 to 11, and the cutter is fixedly installed in the cutter holding hole.
The tool assembly according to claim 12, wherein the tool is installed in the tool holding hole by shrink fitting.
The cutter assembly according to claim 12, wherein the cutter is provided with a second internal cooling channel along the axial direction.
A processing device, characterized in that it comprises a knife handle and the tool assembly according to any one of claims 12 to 14, the knife handle is connected to the knife handle transfer part, and the knife handle is axially opened with An internal cooling through hole communicating with the first internal cooling channel.
A machine tool, characterized by comprising a machine tool body, a main shaft arranged on the machine tool body, and the processing device according to claim 15 connected to the main shaft.