Cooling system for high and low pressure cooling of CNC servo tool turret

Abstract

This invention discloses a cooling system for high and low pressure cooling of CNC servo tool holders, relating to the field of CNC machine tool cooling technology. It includes a sealing joint and cooling channels. The sealing joint comprises a fixed side fixedly installed on the top of the tool holder and a rotating side disposed on the high-pressure cooling tool position of the tool disc. The fixed side of the joint is configured with a double-seal structure. The cooling channels include low-pressure cooling channels and high-pressure cooling channels. Each tool position on the tool disc corresponds to a set of low-pressure or high-pressure cooling channels. A sealing plane is provided on the top of the tool disc. Both the low-pressure and high-pressure cooling channels include vertical cooling holes perpendicular to the sealing plane. The rotating side of the joint on the high-pressure cooling tool position is disposed within the corresponding vertical cooling hole. The structure proposed in this invention makes the use of CNC tool holders more flexible, satisfying both high and low pressure cooling compatibility and adapting well to changes in internally cooled tools, while reducing overall economic costs.

Description

Technical Field

[0001] This invention relates to the field of CNC machine tool cooling technology, specifically a cooling system for high and low pressure cooling of CNC servo tool holders. Background Technology

[0002] High-speed and high-efficiency cutting is a key characteristic of modern machine tools, and rapid and reliable tool exchange and adequate cooling are essential for achieving this goal. Consequently, related functional components such as high-speed spindles, tool magazine robots, and servo tool holders are constantly being developed and improved.

[0003] A typical solution to tool cooling problems is the detachable rotary joint from RIX (Japan). One end of the joint is mounted on the tail end of the spindle and rotates synchronously with it. The other end connects to the cooling pipe and can float back and forth. When coolant flows in, the floating end and the ceramic surface of the rotating end form a seal; when the coolant flow is interrupted, the ceramic seal detaches under the action of the spring at the floating end. This joint is leak-free during operation due to its fine grinding process, but a small amount of leakage may occur during the transition from the detached to the sealed state. Furthermore, because the sealing force between the ground surfaces is relatively large, the joint must detach when there is no coolant to prevent wear; and the spring force required to detach the joint is also relatively large. Therefore, this joint is not suitable for low-pressure applications with liquid pressure less than 0.5 MPa, but is more suitable for high-pressure cooling conditions.

[0004] In CNC turning machine tool cooling, low-pressure cooling is commonly used, typically around 0.2 MPa, and most tool holders on the market conform to this standard. In applications requiring high-pressure cooling, such as internal tool cooling, chip breaking, and chip removal, pressures typically reach 7 MPa. In these cases, custom-made tool holders and internally cooled tools are often necessary. A common practice is to have a sealed threaded hole at the tool's tail end, into which a flexible hose connector is screwed for cooling. However, this approach has drawbacks: the size and form of the sealing hole may vary between different manufacturers and even different specifications, making it inconvenient for users to choose alternatives.

[0005] To address the above problems, this invention proposes a cooling system for high and low pressure cooling of CNC servo tool holders. Summary of the Invention

[0006] The purpose of this invention is to provide a cooling system for high and low pressure cooling of CNC servo tool holders. This cooling system provides a sealing joint structure and corresponding cooling channels. The sealing joint addresses both high and low pressure cooling needs of the servo tool holder. At low pressure, a single sealing surface is engaged, resulting in moderate smoothness and low sealing force. At high pressure, double sealing surfaces are engaged, resulting in high smoothness and strong sealing force. Overall, it meets the cooling and sealing requirements, is economical, and leak-free. The design of the cooling channels, especially for high-pressure internal cooling applications, eliminates the need for a hose connector at the rear of the tool, reducing the risk of interference and providing users with greater freedom in choosing the manufacturer and specifications of the tools they can use.

[0007] The present invention can be achieved through the following technical solution: a cooling system for high and low pressure cooling of CNC servo tool holder, including a tool holder base and a tool disc coaxially rotatable therewith, the cooling system also includes a sealing joint and a cooling channel for guiding the flow of coolant, the sealing joint includes a joint fixing side fixedly installed on the top of the tool holder base and a joint rotating side provided on the high pressure cooling tool position of the tool disc, the joint fixing side is provided with a double sealing structure;

[0008] The cooling channels include low-pressure cooling channels and high-pressure cooling channels. Each tool position on the cutter head corresponds to a set of low-pressure cooling channels or high-pressure cooling channels. The top of the cutter head is provided with a sealing plane. Both the low-pressure cooling channels and the high-pressure cooling channels include vertical cooling holes that are perpendicular to the sealing plane. The rotating side of the connector on the high-pressure cooling tool position is located in the corresponding vertical cooling hole, and the fixed side of the connector is matched with the sealing plane.

[0009] A further technical improvement of the present invention is that: the fixed side connector includes a connector housing fixed to the top of the tool holder, and the connector housing is coaxially sealed with an outer sealing plug and an inner sealing plug. The top of the inner sealing plug abuts against one end of a compression spring and the bottom of the inner sealing plug is in contact with the sealing plane. The other end of the compression spring is fixed to the connector housing by a gasket. A tensioning screw is floatingly arranged between the outer sealing plug and the connector housing to ensure adjustable relative sliding between the outer sealing plug and the connector housing. In the non-working state and under the action of low-pressure coolant, there is a gap between the bottom of the outer sealing plug and the sealing plane.

[0010] A further technical improvement of the present invention is that: the inner sealing plug has a threaded hole on its side wall, and the position perpendicular to the end of the threaded hole is set as a mating plane. The corresponding position of the outer sealing plug has a strip hole. A rotation limiting pin is provided in the threaded hole. The head of the rotation limiting pin is provided with a rotation limiting sealing ring that fits with the mating plane. The head of the rotation limiting pin is located in the strip hole of the outer sealing plug.

[0011] A further technical improvement of the present invention is that: a limiting step hole is provided on the bottom flange of the outer sealing plug, a limiting pin is installed in the limiting step hole, the threaded section of the limiting pin is connected to the axial threaded hole of the joint housing, and there is an movable gap between the limiting head of the limiting pin and the plane of the limiting step hole.

[0012] A further technical improvement of the present invention is that: the cooling channel includes two transverse channels opened at the corresponding positions of the tool positions in the cutter head, and a cutter head connecting channel is provided in the plane where the two transverse channels are located, which is connected to both transverse channels. The cutter head connecting channel is connected to and intersects with the vertical cooling hole of the cutter head.

[0013] Each transverse flow channel either directly mounts a spherical nozzle to spray coolant onto the tool, or communicates with the internal flow channel of the tool holder fixed to the outer periphery of the tool head. The internal flow channel of the tool holder includes transverse tool holder flow channels for low-pressure scenarios and vertical tool holder flow channels for high-pressure scenarios.

[0014] A further technical improvement of the present invention is that: two transverse blade clamp docking channels are provided in the transverse blade clamp flow channel and are sealed and connected to the transverse flow channel; a spherical nozzle is installed at the end of the transverse blade clamp docking channel; and a blade clamp connecting channel is provided between the two transverse blade clamp docking channels.

[0015] A further technical improvement of the present invention is that: two vertical tool clamp docking channels are provided in the vertical tool clamp flow channel and are sealed and connected to the horizontal flow channel; the ends of the two vertical tool clamp docking channels are connected to a tool clamp connecting flow channel; the vertical tool clamp docking channels are provided in the vertical tool clamps installed on the tool disc; and two vertical tool clamps are also provided in the vertical tool clamps that are connected to the vertical flow channel and the tool clamp connecting flow channel.

[0016] A further technical improvement of the present invention is as follows: a blade clamp end cap is fixedly installed on the top of the vertical blade clamp, a liquid distribution plug is fixedly and sealed in the center of the blade clamp end cap, vertical flow channels of the end cap are symmetrically opened inside the blade clamp end cap, and the two vertical flow channels of the end cap are correspondingly connected to the two vertical flow channels of the blade clamp, an axial connecting hole is opened at the bottom of the liquid distribution plug, an annular groove is provided on the outer periphery of the liquid distribution plug, a radial through hole is connected between the annular groove and the axial connecting hole, and two transverse flow channels of the end cap are provided between the annular groove and the two vertical flow channels of the end cap for communication.

[0017] A further technical improvement of the present invention is that: a cutting tool is provided in the vertical tool holder, and an internal cooling nozzle is provided in the center of the cutting tool, and an axial connecting hole is connected to the internal turning tool.

[0018] A further technical improvement of the present invention is that: the rotary side joint is provided with a straight thread, a cylindrical surface and a flange surface from bottom to top, and a sealing ring mounting groove is machined on the cylindrical surface near the straight thread, and an ED sealing ring is installed in the sealing ring mounting groove. The inner diameter of the center bottom hole of the rotary side joint is equivalent to the vertical cooling hole diameter of the cutter head.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The sealing joint in this invention caters to both high and low pressure cooling needs of the servo tool post. At low pressure, a single sealing surface is engaged, resulting in moderate smoothness and low sealing force. At high pressure, double sealing surfaces are engaged, providing high smoothness and strong sealing force. Overall, it meets the cooling and sealing requirements, is economical, and leak-free. The cooling channel design, especially for high-pressure internal cooling applications, eliminates the need for a hose connector at the tool's rear end, reducing the risk of interference and allowing users greater freedom in choosing tool manufacturers and specifications. In summary, the structure proposed in this invention makes the use of CNC tool posts more flexible, satisfying both high and low pressure cooling requirements, adapting well to changes in internally cooled tools, and reducing overall economic costs. Attached Figure Description

[0021] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the external structure of the present invention;

[0023] Figure 2 This is a cross-sectional view of the fixed side of the sealing joint of the present invention.

[0024] Figure 3 For the present invention Figure 2 A magnified view of a section at point A in the middle;

[0025] Figure 4 This is a cross-sectional view of the sealing joint fixed side of the present invention;

[0026] Figure 5 This is a partial cross-sectional view of the sealing joint limiting pin of the present invention;

[0027] Figure 6 This is a cross-sectional view of the transverse flow channel surface of the present invention;

[0028] Figure 7 This is a cross-sectional view of the rotating side connector of the high-pressure knife clip and sealing connector of the present invention;

[0029] Figure 8 This is a cross-sectional view of the transverse flow channel of the high-pressure knife clip end cap of the present invention.

[0030] In the diagram: 1. Tool holder; 2. Tool disc; 3. Sealing joint; 4. Pipe joint; 5. Inlet pipe; 6. Adjusting shim; 8. Vertical tool holder; 9. Internal turning tool; 10. Transverse tool holder; 11. Extended external turning tool; 12. External turning tool; 13. Wedge one; 14. Wedge two; 17. Thread plug; 19. Spherical nozzle one; 20. Spherical nozzle two; 21. O-ring seal; 22. Tool holder end cap; 23. Liquid dispensing plug; 24. Countersunk screw; 25. Radial sealing ring; 26. Filler sealing ring; 301. Connector housing; 302. Outer sealing plug; 303. Inner sealing plug; 304. Gasket; 305. Wire retaining ring; 306. Compression spring; 307. Leak-proof sealing ring; 308. Upper sealing ring; 309. Lower sealing ring; 311. Rotation limiting pin; 312. Rotation limiting sealing ring; 313. Tensioning screw; 314. Tensioning spring; 315. Washer; 316. Elastic retaining ring; 317. Limiting pin; 318. ED sealing ring;

[0031] a. Tool holder mounting surface; b. Tool holder positioning groove; c. Mounting threaded hole; d. Tool internal cooling nozzle; e. Vertical cooling hole; f. Sealing plane; g. Strip hole; h. Tool disc connecting channel; i. Tool holder connecting channel; k. Transverse channel; m. Transverse tool holder docking channel; m'. Transverse tool holder docking channel; o. Annular groove; p. Radial through hole; q. Axial connecting hole; r. End cap vertical channel; s. End cap transverse channel; y. Tool holder vertical channel. Detailed Implementation

[0032] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0033] Please see Figure 1 As shown, the cooling system for high and low pressure cooling of CNC servo tool holder includes a tool holder 1 and a tool disc 2. The mounting surface of the tool holder 1 is provided with an adjustment pad 6 for adjusting the center height, and is fixedly connected to the machine tool slide by multiple hexagon socket head cap screws. The tool disc 2 is rotatably mounted below the tool holder 1, and the axis of rotation is parallel to the mounting surface of the tool holder 1. The tool disc 2 is driven by a servo motor mounted on the tool holder 1.

[0034] like Figures 2-3As shown, the cutter head 2 is provided with a sealing plane f, and a plurality of vertical cooling holes e are evenly provided on the sealing plane f. The number and position of the vertical cooling holes e correspond one-to-one with the tool positions on the cutter head 2. A sealing connector 3 is installed on the tool holder 1 at the position corresponding to the sealing plane f on the cutter head 2. The sealing connector 3 includes a fixed side connector and a rotating side connector. There is only one fixed side connector, which is fixedly installed on the tool holder 1. The rotating side connector is installed in the vertical cooling hole e on the sealing plane f of the cutter head 2. The rotating side connector is only installed on the tool positions that require high-pressure cooling. Other low-pressure cooling tool positions do not need to be installed. Every time the cutter head 2 rotates by one tool position angle, the vertical cooling hole e of the corresponding tool position or the rotating side connector in the vertical cooling hole e is connected to the fixed side connector.

[0035] like Figure 2 As shown, the fixed side connector includes a connector housing 301, which has a through central hole. One end of the central hole has a sealing pipe thread, and an outer sealing plug 302 and an inner sealing plug 303 are coaxially installed in the other end of the central hole.

[0036] The outer sealing plug 302 is radially fitted with the connector housing 301, and a leak-proof sealing ring 307 is installed between the inner and outer walls of the two. The bottom end face of the outer sealing plug 302 is a ground sealing surface, and a flange is provided near its bottom end face. A coaxial stepped hole is provided in the center of the outer sealing plug 302. The inner sealing plug 303 is slidably disposed in the coaxial stepped hole, and an upper sealing ring 308 and a lower sealing ring 309 are installed on the outer peripheral wall of the inner sealing plug 303. The bottom of the inner sealing plug 303 is a sealing surface, and a compression spring 306 is abutted on its top. The top of the compression spring 306 abuts against a gasket 304 located near the sealing pipe thread. Thus, the top of the inner sealing plug 303 and the gasket 304 form the stroke cavity of the compression spring 306, and the stepped structure of the coaxial stepped hole limits the top of the inner sealing plug 303.

[0037] Furthermore, the gasket 304 is fixed with a wire retainer 305 at its mounting point, which protects the gasket 304 from moving downward and squeezing the compression spring 306 when the coolant is under high pressure, thereby preventing the compression spring 306 from being over-compressed. In addition, the gasket 304 is provided with a clearance hole, and several small holes are evenly distributed around the outer circumference of the clearance hole, which provides a support surface for the compression spring 306 while ensuring that the fluid does not have a throttling effect at this point.

[0038] Furthermore, a clearance gap S is provided between the bottom of the outer sealing plug 302 and the sealing plane f;

[0039] like Figure 4As shown, the inner sealing plug 303 has a threaded hole on the side wall between the upper sealing ring 308 and the lower sealing ring 309, and a mating plane is provided at the end of the threaded hole. The outer sealing plug 302 has a strip hole g at the corresponding position. A rotation limiting pin 311 is provided in the threaded hole. The head of the rotation limiting pin 311 has a rotation limiting sealing ring 312 that fits with the mating plane. The head of the rotation limiting pin 311 is located in the strip hole g of the outer sealing plug 302. Thus, the rotation limiting pin 311 inhibits the relative rotation of the two sealing plugs and also limits the length of the inner sealing plug 303 extending relative to the outer sealing plug 302. The clearance groove at the corresponding position on the connector housing 301 only provides assembly space and has no mating relationship.

[0040] The top of the connector housing 301 has several stepped holes evenly distributed axially. A tensioning screw 313 is installed in the stepped hole. The end of the tensioning screw 313 is threadedly connected to the flange of the outer sealing plug 302. An elastic retaining ring 316 is provided at the end of the tensioning screw 313 to prevent loosening. A tensioning spring 314 is provided between the head of the tensioning screw 313 and the stepped hole. The tensioning spring 314 is sleeved on the outside of the tensioning screw 313 and a washer 315 is provided at its end.

[0041] like Figure 5 As shown, the flange of the outer sealing plug 302 is also provided with a limiting stepped hole, and a limiting pin 317 is installed in the limiting stepped hole. The threaded section of the limiting pin 317 is connected to the axial threaded hole of the joint housing 301, and there is a movable clearance W between the limiting head of the limiting pin 317 and the plane of the limiting stepped hole, and the movable clearance is greater than the clearance S. After the limiting pin 317 is installed, it can limit the stroke of the outer sealing plug 302 relative to the joint housing 301 and restrict its circumferential rotation.

[0042] like Figure 1 and Figure 6 As shown, the cutter head 2 is uniformly provided with cutter clamp mounting surfaces a perpendicular to the sealing plane f in the circumferential direction. Each cutter clamp mounting surface a is provided with a cutter clamp positioning groove b parallel to the rotation axis. Multiple mounting threaded holes c for mounting cutter clamps are symmetrically provided on both sides of the cutter clamp positioning groove b. At the same time, transverse flow channels k perpendicular to the cutter clamp mounting surface a are symmetrically opened in the cutter clamp mounting surfaces a on both sides of the cutter clamp positioning groove b. A cutter head connecting flow channel h is provided in the plane where the two transverse flow channels k are located, which is connected to both transverse flow channels k. The cutter head connecting flow channel h is connected to and intersects with the vertical cooling hole e of the cutter head 2. One end of the cutter head connecting flow channel h passes through the side of the cutter head 2 and is provided with a threaded plug 17 for sealing.

[0043] When in use, the fixed side connector connects to the pipe connector 4 via the sealing pipe thread on the connector housing 301 and connects to the liquid inlet pipe 5 to introduce coolant into the cutter head 2. The coolant enters the transverse flow channel k through the sealing plane f, the vertical cooling hole e, and the cutter head connecting flow channel h. The end of the transverse flow channel k is provided with a reamed countersunk hole. Spherical nozzle 19 and spherical nozzle 20 are installed in the two reamed countersunk holes respectively. The spray direction can be adjusted to externally cool the tool directly mounted on the cutter head 2. This type of tool directly mounted is generally an external turning tool 12.

[0044] When the tool needs to be mounted and cooled by mounting a tool holder on the tool holder mounting surface a, there are two types of tool holders: using a horizontal tool holder 10 and using a vertical tool holder 8;

[0045] When using the transverse tool holder 10, the transverse tool holder 10 is provided with two transverse tool holder docking channels m, and a tool holder connecting channel i is provided between the two transverse tool holder docking channels m. The two transverse tool holder docking channels m correspond one-to-one with the two transverse channels k and are connected and docked. The ends of the transverse tool holder docking channels m away from the transverse channels k are respectively equipped with spherical nozzle 19 and spherical nozzle 20, which can adjust the spray direction of coolant to externally cool the tool. The tool using the transverse tool holder 10 is generally an extended tool, such as an external diameter extended tool 11.

[0046] Furthermore, each tool clamping surface a of the cutter head 2 is machined with a tool clamping groove at the bottom. The tool clamping groove is equipped with wedge 13 and wedge 24, which work together to lock and fix the horizontally mounted tool.

[0047] like Figures 6-8 As shown, when the tool needs to be installed using a vertical tool holder 8 and requires internal cooling, such as an internal turning tool 9, the vertical tool holder 8 has two vertical tool holder docking channels m' and a tool holder connecting channel i between the two vertical tool holder docking channels m'. The two vertical tool holder docking channels m' correspond one-to-one with the two horizontal channels k and are connected and docked. An O-ring 21 is provided at the docking position of the two for sealing. At the same time, two tool holder vertical channels y are also symmetrically opened in the vertical tool holder 8.

[0048] A tool holder end cover 22 is fixedly installed on the top of the vertical tool holder 8. The bottom end face of the tool holder end cover 22 is provided with a stop to form an axial positioning with the vertical tool holder 8 and to provide an axial reference for the installation of the internal turning tool 9. A liquid distribution plug 23 is provided in the center of the tool holder end cover 22. Two radial sealing rings 25 are provided between the liquid distribution plug 23 and the tool holder end cover 22 for radial sealing. The liquid distribution plug 23 is pressed into the top of the tool holder end cover 22 by a countersunk screw 24 to reduce the overall height and avoid interference when the tool disc 2 rotates.

[0049] The end cap 22 of the knife clamp is symmetrically provided with vertical flow channels r, and the two vertical flow channels r of the end cap are corresponding one-to-one with the two vertical flow channels y of the knife clamp and are connected and connected. The bottom of the liquid distribution plug 23 is provided with an axial connecting hole q. An annular groove o is provided on the outer periphery of the liquid distribution plug 23 and located between the two radial sealing rings 25. A radial through hole p is provided between the annular groove o and the axial connecting hole q, so that the annular groove o and the axial connecting hole q are connected through the radial through hole p.

[0050] Two transverse flow channels s of the end caps are provided between the annular groove o and the vertical flow channels r of the two end caps to connect them. A filling sealing ring 26 is provided at the bottom of the axial connecting hole q to match the appropriate gap left between it and the end of the tool. The center of the internal turning tool 9 is provided with an internal cooling nozzle d, and the axial connecting hole q is connected to the internal turning tool 9.

[0051] Thus, when internal cooling is performed on the internal turning tool 9, the coolant flows sequentially from the vertical cooling hole e through the tool disc transverse flow channel k, the tool holder connecting flow channel i, and the tool holder vertical flow channel y, and then enters the end cover transverse flow channel r, and flows sequentially to the end cover transverse flow channel s, the annular groove o, the radial through hole p, and finally enters the axial connecting hole q and the tool internal cooling nozzle d.

[0052] For applications requiring high-pressure internal cooling, such as the location of the vertical tool holder 8 mentioned above, a rotary side connector is installed in the vertical cooling hole e at that corresponding position. Figure 7 As shown, the rotary side joint is provided with a straight thread, a cylindrical surface and a flange surface from bottom to top. A sealing ring mounting groove is machined on the cylindrical surface near the straight thread, and an ED sealing ring 318 is installed in the sealing ring mounting groove. The ED sealing ring 318 inhibits the leakage of high-pressure coolant to the sealing plane f side. The flange surface height is controlled so that its end is at the same height as the sealing plane f on the aforementioned cutter head 2.

[0053] More specifically, the inner diameter of the center bottom hole of the aforementioned rotary side joint is equivalent to the vertical cooling hole diameter of the cutter head 2, and one end of the flange face of the rotary side joint is provided with an internal hexagon countersunk hole to facilitate the installation and operation of the wrench.

[0054] Furthermore, the aforementioned rotary side joint is made of high-quality carbon steel that has been quenched and polished, which is different from the copper alloy used in the inner sealing plug 303 and outer sealing plug 302 in the fixed side joint. It is durable and not prone to glue.

[0055] The sealing joint 3 operates under two conditions: low-pressure cooling and high-pressure cooling. The operating states of the sealing joint 3 under these two conditions are described below:

[0056] During low-pressure cooling, no rotary side joint is installed in the vertical cooling hole e. The end face of the inner sealing plug 303 is in contact with the sealing plane f of the cutter head 2 under the action of the compression spring 306. The surface machining accuracy of the sealing plane f is between Ra1.6 and 0.8. The liquid pressure of the coolant is insufficient to overcome the upward force of the tension spring 314. The outer sealing plug 302 cannot extend, and its bottom end face still maintains a gap of size S with the sealing plane f.

[0057] During high-pressure cooling, a rotary side connector is installed in the vertical cooling hole e. The flange surface of the rotary side connector is polished to a surface finish of Ra0.2-0.4. The end face of the inner sealing plug 302 is in contact with the sealing plane f of the cutter head 2 under the action of the compression spring 306. Under the action of high-pressure coolant, the outer sealing plug 302 overcomes the upward force of the tension spring 314 and, together with the inner sealing plug 303, is in contact with the flange surface of the rotary side connector to form a sealing channel. When the coolant is disconnected, the outer sealing plug 303 is released from contact with the rotary side connector under the action of the tension spring 314, thereby protecting the flange surface from wear during the rotation of the cutter head 2.

[0058] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A cooling system for high and low pressure cooling of a CNC servo tool post, comprising a tool post base (1) and a tool disc (2) coaxially rotatable therewith, characterized in that, The cooling system also includes a sealing joint (3) and a cooling channel for guiding the flow of coolant. The sealing joint (3) includes a fixed side joint fixedly installed on the top of the tool holder (1) and a rotating side joint set on the high-pressure cooling tool position of the tool disc (2). The fixed side joint is configured as a double sealing structure. The cooling channels include low-pressure cooling channels and high-pressure cooling channels. Each tool position on the cutter head (2) corresponds to a set of low-pressure cooling channels or high-pressure cooling channels. The top of the cutter head (2) is provided with a sealing plane (f). Both the low-pressure cooling channels and the high-pressure cooling channels include vertical cooling holes (e) that are perpendicular to the sealing plane. The rotating side joint on the high-pressure cooling tool position is set in the corresponding vertical cooling hole (e). The fixed side joint is matched with the sealing plane (f). The fixed side connector includes a connector housing (301) fixed to the top of the tool holder (1). The connector housing (301) has an outer sealing plug (302) and an inner sealing plug (303) in a coaxial sealing sleeve. The top of the inner sealing plug (303) abuts against one end of a compression spring (306) and the bottom of the inner sealing plug (303) is in contact with the sealing plane (f). The other end of the compression spring (306) is abutted and fixed to the connector housing (301) through a gasket (304). A tensioning screw (313) is floating between the outer sealing plug (302) and the connector housing (301) to ensure adjustable relative sliding between the outer sealing plug (302) and the connector housing (301). In the non-working state and under the action of low-pressure coolant, there is a gap between the bottom of the outer sealing plug (302) and the sealing plane (f).

2. The cooling system for high and low pressure cooling of CNC servo tool post according to claim 1, characterized in that, The inner sealing plug (303) has a threaded hole on its side wall, and the end of the threaded hole is set as a mating plane. The outer sealing plug (302) has a strip hole (g) at the corresponding position. A rotation limiting pin (311) is provided in the threaded hole. The head of the rotation limiting pin (311) is provided with a rotation limiting sealing ring (312) that fits against the mating plane. The head of the rotation limiting pin (311) is located in the strip hole (g) of the outer sealing plug (302).

3. The cooling system for high and low pressure cooling of CNC servo tool post according to claim 1, characterized in that, The bottom flange of the outer sealing plug (302) is also provided with a limiting step hole, and a limiting pin (317) is installed in the limiting step hole. The threaded section of the limiting pin (317) is connected to the axial threaded hole of the connector housing (301), and there is an movable gap between the limiting head of the limiting pin (317) and the plane of the limiting step hole.

4. The cooling system for high and low pressure cooling of CNC servo tool holder according to claim 1, characterized in that, The cooling channel includes two transverse channels (k) opened in the cutter head (2) at the corresponding positions of the cutter positions. The plane containing the two transverse channels (k) is provided with a cutter head connecting channel (h) that is connected to both transverse channels (k). The cutter head connecting channel (h) is connected to and intersects with the vertical cooling hole (e) of the cutter head (2). Each transverse flow channel (k) is either directly equipped with a spherical nozzle to spray coolant onto the tool, or connected to the internal flow channel of the tool holder fixed on the outer periphery of the tool disc (2). The internal flow channel of the tool holder includes a transverse tool holder flow channel for low-pressure scenarios and a vertical tool holder flow channel for high-pressure scenarios.

5. The cooling system for high and low pressure cooling of CNC servo tool post according to claim 4, characterized in that... The transverse blade clamp flow channel is provided with two transverse blade clamp docking flow channels (m) that are sealed and connected to the transverse flow channel (k). A spherical nozzle is installed at the end of the transverse blade clamp docking flow channel (m). A blade clamp connecting flow channel (i) is provided between the two transverse blade clamp docking flow channels (m).

6. The cooling system for high and low pressure cooling of CNC servo tool post according to claim 4, characterized in that, The vertical tool holder flow channel is provided with two vertical tool holder docking flow channels (m') that are sealed and connected to the horizontal flow channel (k). The ends of the two vertical tool holder docking flow channels (m') are connected to the tool holder connecting flow channel (i). The vertical tool holder docking flow channel (m') is set in the vertical tool holder (8) installed on the tool disc (2). The vertical tool holder (8) is also provided with two flow channels that are connected to the tool holder vertical flow channel (y) and the tool holder connecting flow channel (i).

7. The cooling system for high and low pressure cooling of CNC servo tool post according to claim 6, characterized in that, The vertical blade clamp (8) is fixedly installed with a blade clamp end cap (22) at the top. A liquid distribution plug (23) is fixedly and sealed in the center of the blade clamp end cap (22). Vertical flow channels (r) are symmetrically opened inside the blade clamp end cap (22), and the two vertical flow channels (r) are connected to the two vertical flow channels (y) of the blade clamp. An axial connecting hole (q) is opened at the bottom of the liquid distribution plug (23). An annular groove (o) is provided on the outer periphery of the liquid distribution plug (23). A radial through hole (p) is connected between the annular groove (o) and the axial connecting hole (q). Two transverse flow channels (s) are provided between the annular groove (o) and the two vertical flow channels (r) of the end cap for communication.

8. The cooling system for high and low pressure cooling of CNC servo tool post according to claim 7, characterized in that, The vertical tool holder (8) contains a tool, and the tool has an internal cooling nozzle (d) at its center. The axial connecting hole (q) is connected to the internal turning tool (9).

9. The cooling system for high and low pressure cooling of CNC servo tool post according to claim 1, characterized in that, The rotary side joint is provided with a straight thread, a cylindrical surface and a flange surface from bottom to top. A sealing ring mounting groove is machined on the cylindrical surface near the straight thread, and an ED sealing ring (318) is installed in the sealing ring mounting groove. The inner diameter of the center bottom hole of the rotary side joint is equivalent to the vertical cooling (e) hole diameter of the cutter head (2).

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