Numerical control double-shaft drilling and milling power head for valve body machining

Abstract

The invention relates to the related technical field of machine tool driving mechanisms, discloses a numerical control double-shaft drilling and milling power head for valve body machining, and aims to solve the problem that a traditional fixed-position double-shaft structure is prone to motion interference in the machining process. The double shafts are used for drilling and milling; the second output shaft can drive the screw to rotate and enable the guide frame to move up and down along the screw, the guide frame is used for forcing the movable box to drive the first output shaft to reciprocate up and down in the axial direction of the first output shaft, and in the process, the first output shaft can vertically move relatively in the axial direction of the second output shaft, so that the distance between the ends of the first output shaft and the second output shaft is increased, and it is avoided that when a valve body is machined, the machining efficiency is improved. And the main shaft interferes with the workpiece due to the height difference of the valve body.

Description

Technical Field

[0001] This invention relates to the technical field of machine tool drive mechanisms, and in particular to a CNC dual-axis drilling and milling power head for valve body machining. Background Technology

[0002] Dual-axis drilling and milling power heads, as advanced composite machining equipment, play a vital role in modern manufacturing. They ingeniously integrate drilling and milling, two common machining functions, greatly expanding the processing capabilities of the equipment. Typically, a dual-axis drilling and milling power head consists of two adjacent output shafts. This unique design gives it high flexibility, allowing it to simultaneously perform drilling and milling operations on a workpiece, or to perform drilling or milling operations separately, depending on the actual machining requirements.

[0003] A search revealed that CN217667805U discloses a dual-axis lifting power head for CNC lathes, comprising: using a lifting mechanism to drive the spindle box for height adjustment, enabling ordinary CNC lathes to perform composite machining, thereby reducing production processes and costs and improving production efficiency; and using a first spindle and a second spindle set on the spindle box to simultaneously process workpieces, thereby improving production efficiency.

[0004] While current dual-axis milling heads excel in improving machining efficiency, in practical applications, especially during milling, the close proximity and fixed position of the two spindles can lead to potential problems when dealing with workpieces with unusual shapes. Take valve body machining as an example: valve bodies often have significant height differences and complex shapes. During milling, the fixed positions of the two spindles can cause their motion trajectories to overlap or intersect due to the workpiece shape. This can easily lead to physical collisions between components of the milling head, causing motion interference. This interference not only affects machining quality, resulting in scratches, pits, and other defects on the workpiece surface, but can also damage the milling head equipment, causing significant economic losses to the company. Summary of the Invention

[0005] This invention proposes a CNC dual-axis drilling and milling power head for valve body machining, which has the advantage of relative axial movement between the two axes, thereby solving the problem of motion interference that easily occurs in the machining process of traditional fixed-position dual-axis structures mentioned in the background art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a CNC dual-axis drilling and milling power head for valve body machining, comprising: a power box, with a power shaft connected to a motor mounted on the top inner side, and an output shaft two rotating synchronously with the power shaft via a gear assembly on the outer side of the power shaft; a movable box, movably mounted on the side of the power box, with an output shaft one movably mounted inside the movable box, a spiral shaft coaxially fixed at the bottom end of the power shaft, the spiral shaft and the output shaft one being connected by a pulley assembly for transmission, so that the output shaft one rotates with the power shaft; tool holders for clamping tools are mounted at the bottom ends of both the output shaft one and the output shaft two; a screw rod is sleeved on the outer side of the output shaft two and movably mounted on the bottom inner side of the power box, and an electromagnetic fastening assembly is provided on the output shaft two to connect / disconnect the output shaft two and the screw rod; a guide frame is threadedly connected to the outer side of the screw rod and fastened to the movable box; when the output shaft two drives the screw rod to rotate, the screw rod is driven by the guide frame, so that the movable box drives the tool holder to move up and down, thereby changing the relative position of the tools on the output shaft one and the output shaft two.

[0007] Furthermore, the cross-sectional shape of the flower axis is polygonal.

[0008] Furthermore, the electromagnetic fastening assembly includes: an electromagnet, fixed to the outside of the second output shaft and located above the screw; a pressure cylinder, fitted onto the outside of the second output shaft and located above the electromagnet, and a reset spring is provided between the pressure cylinder and the electromagnet; when the electromagnet is energized, it generates magnetism and attracts the pressure cylinder to move downward to contact the screw, thereby realizing the contact transmission connection between the pressure cylinder and the screw.

[0009] Furthermore, a cooling cylinder is fixedly installed at the bottom of both the power box and the movable box, located outside the tool holder. The tool holder is also fitted with the bottom of the two output shafts. A buffer spring is movably installed between the tool holder and the power box. A position switch is fixedly installed on the top of the outer side of the cooling cylinder. The power box pushes the tool holder to press against the workpiece. When the tool holder overcomes the spring force of the buffer spring and moves to the position of the position switch, the position of the tool holder at this moment is the initial coordinate position.

[0010] Furthermore, the bottoms of both output shaft two and output shaft one are elliptical.

[0011] Furthermore, an axial flow fan blade is movably mounted on the outside of the tool holder, and a one-way transmission assembly is provided between the two; a nozzle for spraying coolant is installed at the bottom of the cooling cylinder, and a stepped surface is provided in the middle of the outside of the tool holder to block the nozzle; a coolant inlet located below the axial flow fan blade is fixedly installed on the outside of the cooling cylinder, and a one-way valve is provided in the coolant inlet; a coolant outlet is installed on the side of the cooling cylinder above the axial flow fan blade, and the coolant outlets on the two tool holders are connected to each other by a connecting pipe; a coolant overflow outlet is installed on the side of the cooling cylinder above the coolant outlet, and a pressure limiting valve is provided in the coolant overflow outlet, and the coolant overflow outlets on the two tool holders are connected by an overflow pipe.

[0012] Furthermore, the overflow pipe is a tee pipe.

[0013] The present invention has the following beneficial effects:

[0014] The present invention provides a CNC dual-axis drilling and milling power head for valve body machining. The power shaft enables output shaft one and output shaft two to rotate synchronously through the action of gear assembly and pulley assembly, thereby utilizing the dual axes to carry out drilling and milling operations.

[0015] Specifically, when output shaft two rotates, the contact friction between output shaft two and the screw is controlled, thereby driving the screw to rotate as well. The rotation of the screw causes the guide frame to move up and down along the screw. The movement of the guide frame forces the movable box to drive output shaft one to move up and down along its own axis. During this process, output shaft one can move vertically relative to the axis of output shaft two, thereby increasing the distance between the ends of output shaft one and output shaft two. In this way, even if there is a height difference in the valve body, interference between the spindle and the workpiece can be effectively avoided when machining the valve body. Attached Figure Description

[0016] The accompanying drawings, which form part of this specification, illustrate embodiments of the invention and, together with the specification, serve to explain the principles of the invention.

[0017] The invention will be more clearly understood with reference to the accompanying drawings and the following detailed description, wherein:

[0018] Figure 1 This is a schematic diagram of the overall external three-dimensional structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the overall bottom three-dimensional structure of the present invention;

[0020] Figure 3 This is a schematic diagram of the overall internal three-dimensional structure of the present invention;

[0021] Figure 4 This is a schematic diagram showing the position and three-dimensional structure of each component on the output shaft of the present invention;

[0022] Figure 5 This is a schematic diagram of the overall internal planar cross-section of the present invention;

[0023] Figure 6 For the present invention Figure 5 Enlarged view of part E in the middle;

[0024] Figure 7 This is a schematic diagram of the connection structure between the blade holder and the axial flow fan blade of the present invention.

[0025] In the diagram: 1. Power box; 2. Movable box; 3. Power shaft; 4. Tool holder; 401. Buffer spring; 402. Axial flow fan blade; 5. Cooling cylinder; 501. Nozzle; 502. Coolant inlet; 503. Coolant outlet; 504. Coolant overflow outlet; 6. Connecting pipe; 7. Overflow pipe; 8. Output shaft one; 9. Output shaft two; 10. Spindle shaft; 11. Gear assembly; 12. Guide frame; 13. Pulley assembly; 14. Screw; 15. Pressure cylinder; 150. Reset push spring; 151. Electromagnet; 16. Position switch. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1, please refer to Figure 1 and Figure 2 As can be seen, the power box 1 is rectangular in shape, and the mounting bracket on the side of the power box 1 allows it to be installed in the required position. On the side relatively away from the mounting bracket, there is a movable box 2 that is movably mounted using a dovetail frame. Guided by the dovetail frame, the movable box 2 can move up and down along the side of the power box 1.

[0028] Combination Figure 3 and Figure 5 It can be seen that the top inner side of the power box 1 has a power shaft 3 movably mounted using bearings. The power shaft 3 is generally connected to a reducer and a servo motor, which provides power for the forward and reverse rotation of the power shaft 3. Inside the power box 1, there is an output shaft 9 mounted using bearings, and the output shaft 9 and the power shaft 3 are connected by a gear assembly 11. More specifically, the gear assembly 11 consists of two identical cylindrical gears. One gear is fixed to the bottom outer side of the power shaft 3 and located inside the power box 1, while the other gear is fixed to the top outer side of the output shaft 9. The two gears mesh with each other to achieve transmission between them. Inside the movable box 2, there is an output shaft 8 movably mounted using bearings, combined with... Figure 3As can be seen, the bottom of the power shaft 3 is coaxially fastened with a flange to a nonagonal cross-section shaft 10. The output shaft 8 and the nonagonal shaft 10 are connected by a pulley assembly 13. More specifically, the pulley assembly 13 includes, but is not limited to, pulleys and sprockets. The accompanying drawings use pulleys as an example: one pulley is movably mounted on the outer side of the nonagonal shaft 10, and the other pulley is fixedly mounted on the outer side of the output shaft 8. The two are connected by a belt drive, thereby enabling the nonagonal shaft 10 to drive the output shaft 8 to rotate synchronously. Generally, tool holders 4 are installed at the bottom of the output shaft 8 and the output shaft 9. The tool holders 4 can clamp and hold the tools, ensuring that the rotational power of the output shaft 8 and the output shaft 9 can be transmitted to the tools.

[0029] In practical applications, such as valve body machining, the height difference of the valve can easily cause motion interference issues when machining dual shafts in a fixed position. To prevent such problems, a combination of... Figures 3-5 As can be seen, a screw 14 is sleeved on the outer side of the output shaft 2 9. The bottom of the screw 14 is movably mounted on the inner bottom of the power box 1 using a bearing. An electromagnet 151 is fixedly installed on the top of the outer side of the output shaft 2 9, above the screw 14. The electromagnet 151 can generate magnetism when energized. The power source of the electromagnet 151 can be referenced from the power supply of brushes and energizer rings in a motor, which will not be elaborated here. A pressure cylinder 15 is sleeved on the outer side of the output shaft 2 9, above the electromagnet 151. A reset spring 150 is sleeved on the outer side of the output shaft 2 9 between the pressure cylinder 15 and the electromagnet 151. Under normal conditions, the pressure cylinder 15 is forced away from the screw 14 by the elastic force of the reset spring 150. At this time, the pressure cylinder 15 and the screw 14 do not contact each other, and the rotation of the output shaft 2 9 will not drive the screw 14 to rotate. When the electromagnet 151 is energized, it will generate magnetism that attracts the pressure cylinder 15. The pressure cylinder 15 will be attracted by the magnetism and press against the top of the screw 14, and at the same time compress the reset spring 150. At this time, when the output shaft 9 rotates, the screw 14 will be driven to rotate synchronously by the transmission between the pressure cylinder 15 and the screw 14.

[0030] Inside the movable box 2, there is a guide frame 12 that is bolted in place, such as... Figure 5 As shown, the left end of the guide frame 12 is movably mounted to the output shaft 8 via a bearing, the right end is threadedly connected to the screw 14, and the middle part is movably mounted using a bearing and a pulley on the pulley assembly 13. It should be noted that the inner side of the pulley on the pulley assembly 13 is movably connected to the swivel shaft 10, so that it can move along the axial direction of the swivel shaft 10 and drive the pulley to rotate synchronously. The outer side of the pulley is movably mounted using a bearing and the guide frame 12, which not only limits the pulley using the guide frame 12, but also drives the pulley to move synchronously up and down along the axial direction of the swivel shaft 10 when the guide frame 12 moves up and down.

[0031] In practical applications, the power shaft 3 is rotated by a motor. At this time, the power shaft 3 uses the gear assembly 11 to make the output shaft 9 rotate. The spindle 10 follows the power shaft 3 and uses the pulley assembly 13 to drive the output shaft 8 to rotate synchronously. The rotation of the output shaft 8 and the output shaft 9 can drive the corresponding tool holder 4 to rotate. The tool installed on the tool holder 4 can perform drilling and milling on the valve body.

[0032] If it is necessary to adjust the length between the two tool holders 4 to prevent the tools on the tool holders 4 from interfering with the workpiece during machining, the electromagnet 151 is activated, forcing it to generate magnetism and attract the pressure cylinder 15. The pressure cylinder 15 moves downwards under the influence of the magnetic force, compressing the reset spring 150 and simultaneously pressing against the end of the screw 14. Then, by controlling the forward and reverse rotation of the power shaft 3, the output shaft 2 9 can drive the screw 14 to rotate in both directions. When the screw 14 rotates, it causes the threaded guide frame 12 to move up and down. When the guide frame 12 drives the movable box 2 to move up and down, the tool holders 4 on the movable box 2 can move away from / closer to the tool holders 4 on the output shaft 2 9, thereby changing the position between the two tools and preventing interference between the tools during valve body machining.

[0033] It should be added that, in actual application, a grating displacement sensor is also installed between the movable box 2 and the power box 1, so that the distance of the movable box 2 when it moves up and down can be precisely controlled.

[0034] Example 2 is a further improvement on Example 1, combining... Figures 5-7 It can be seen that both the power box 1 and the movable box 2 have cooling cylinders 5 bolted to the outside of the tool holder 4 at their bottoms, and the cooling cylinders 5 and the tool holder 4 on the output shaft 8 / output shaft 9 are arranged coaxially. The tool holder 4 is movably fitted inside the cooling cylinder 5. The bottoms of the output shaft 9 and the output shaft 8 are elliptical, which drives the tool holder 4 to rotate synchronously. A buffer spring 401 is movably installed between the tool holder 4 and the power box 1. Under the push of the buffer spring 401, the tool holder 4 always has a downward tendency. At the same time, a stop switch 16 is fixedly installed on the top of the outside of the cooling cylinder 5. When the tool holder 4 moves upward to its limit, it can not only compress the buffer spring 401, but also activate the stop switch 16. The advantage of this design is that when the dual-axis power head in this application performs tool setting, the power box 1 pushes the tool holder 4 to press against the workpiece. When the tool holder 4 presses against the buffer spring 401 and moves to the vicinity of the position switch 16, the position switch 16 is turned on and stops the power box 1 from continuing to approach the workpiece. At this time, the position of the tool holder 4 returning to the position switch 16 is the initial coordinate position after tool setting, thus completing the tool setting.

[0035] However, in practical applications, on the one hand, because the tool holder 4 is always pushed outward, there is a certain distance between the actual position of the tool holder 4 and the tool setting point. To ensure that the tool holder 4 can accurately utilize the coordinates after tool setting, when the tool on the tool holder 4 is performing normal drilling and milling work, the tool holder 4 needs to move to the vicinity of the positioning switch 16, that is, the tool holder 4 needs to move to the coordinate position after tool setting. On the other hand, since there are two output shafts, the external coolant needs to act on the two output shafts separately. However, in practical applications, it is known that output shaft 8 and output shaft 9 do not perform machining operations simultaneously. In order to ensure that the coolant flows accurately to the corresponding working tool holder 4, combined with... Figures 5-7 It can be seen that an axial flow fan blade 402 is movably mounted on the outer side of the tool holder 4, and a one-way transmission assembly is provided between the two, such as... Figure 7 As shown, the inner side of the axial flow fan blade 402 is provided with approximately right-angled triangular unidirectional toothed blocks at equal angles. The outer side of the tool holder 4 has a round rod pushed outward by a spring, which abuts against the unidirectional toothed blocks, enabling the tool holder 4 to drive the axial flow fan blade 402 to rotate in one direction. Multiple nozzles 501 are fixedly installed at equal angles around the bottom of the cooling cylinder 5, allowing coolant to be sprayed towards the tool. Under normal conditions, because the outer middle of the tool holder 4 has a stepped surface that slides and seals with the inner side of the cooling cylinder 5, when the tool holder 4 is pushed down to its bottom limit by the spring force of the buffer spring 401, the stepped surface on the outer side of the tool holder 4 blocks the nozzles 501, preventing the nozzles 501 from communicating with the inner cavity of the cooling cylinder 5.

[0036] from Figure 6As can be seen, a coolant inlet 502 is fixedly installed on the outside of the cooling cylinder 5, located below the axial fan blade 402. A one-way valve is installed in the coolant inlet 502 to allow unidirectional delivery of external coolant into the inner cavity of the cooling cylinder 5. The external coolant is generally located in a coolant tank on the machine tool. Generally, when the coolant is sprayed onto the workpiece, it flows back into the machine tool under gravity, and after filtration, flows back into the coolant tank, thus achieving coolant circulation. In this application, the coolant inlet 502 can be directly connected to the cooling tank using a hollow flexible hose. Since there are two cooling cylinders 5, there should also be two hollow flexible hoses for delivering coolant into the inner cavity of the cooling cylinder 5. A coolant outlet 503, communicating with the inner cavity of the cooling cylinder 5, is installed on the side of the cooling cylinder 5 and above the axial fan blade 402. The coolant outlets 503 on the two tool holders 4 are interconnected by a connecting pipe 6. The connecting pipe 6 has a certain length to meet the requirement of the movable box 2 moving up and down along the side of the power box 1. A coolant overflow nozzle 504 is installed on the side of the cooling cylinder 5 and above the coolant drain nozzle 503. A pressure limiting valve is installed in the coolant overflow nozzle 504, which mainly consists of a spring and a conical piston. When the pressure exceeds the spring pressure, the conical piston opens. Generally, the spring strength in the coolant overflow nozzle 504 is greater than the spring strength in the buffer spring 401. The coolant overflow nozzles 504 on the two tool holders 4 are connected by an overflow pipe 7, which is a T-shaped pipe, connecting the two coolant overflow nozzles 504 to the coolant tank.

[0037] In actual operation of this embodiment two:

[0038] Tool setting state: The tool is installed in the tool holder 4. The power unit 1 drives the tool on the tool holder 4 to move onto the workpiece, continuously pressing the tool until the tool holder 4 retracts into the cooling cylinder 5. When the tool holder 4 is fully retracted into the cooling cylinder 5, the position switch 16 detects the position of the tool holder 4 and sends an electrical signal to the control system, causing the power unit 1 to stop applying pressure. At this point, the position of the tool holder 4 retracted to the position of the position switch 16 is marked as the reference point.

[0039] When work is required, the power box 1 drives the tool on the tool holder 4 to move towards the workpiece, causing the tool holder 4 to be pressed and moved to the position of the stop switch 16. At this time, the power shaft 3 drives the output shaft 8 and the output shaft 9 to rotate synchronously, from... Figure 5 As can be seen, since the power shaft 3 and output shaft 8 are connected by a pulley, and the power shaft 3 and output shaft 9 are connected by a gear, the rotation directions of the power shaft 3 and output shaft 8 are the same, while the rotation directions of the power shaft 3 and output shaft 9 are opposite. In machining, the tool rotates clockwise in most cases, which allows the tool to coordinate with the workpiece feed direction to form a standard cut.

[0040] Based on this, Figure 7 For example, when the tool holder 4 that is in contact with the workpiece rotates in the forward direction, it will not drive the axial flow fan blade 402 to rotate. Similarly, when the tool holder 4 that is not in operation rotates in the reverse direction, it will drive the axial flow fan blade 402 to rotate synchronously.

[0041] by Figure 5 For example, after the right-side tool holder 4 moves upward and the positioning switch 16 is activated, the outer stepped surface of the tool holder 4 passes over the coolant discharge nozzle 503 and is below the coolant overflow nozzle 504. At this time, the coolant discharge nozzle 503 is connected to the inner cavity of the right-side cooling cylinder 5. Since the tool on the left-side tool holder 4 is not touching the workpiece, the outer stepped surface of the tool holder 4 blocks the nozzle 501. As the output shaft 8 drives the axial flow fan blade 402 to rotate in the opposite direction, the axial flow fan blade 402 draws in the coolant inlet nozzle 502 and delivers the coolant through the connecting pipe 6 to the inner cavity of the right-side cooling cylinder 5. Since the stepped surface of the right-side tool holder 4 is above the coolant discharge nozzle 503 at this time, as the connecting pipe 6 continuously applies pressure to the inner cavity of the cooling cylinder 5, on the one hand, it prevents the tool holder 4 from moving downward, and on the other hand, the increased pressure in the inner cavity of the cooling cylinder 5 causes the coolant to spray out from the nozzle 501. At this time, only the working tool holder 4 will cause the nozzle 501 to spray coolant outward. Because the power shaft 3 continuously drives the output shaft 8 to rotate, the pressure inside the cooling cylinder 5 is always present. Therefore, when the tool holder 4 is working, the coolant pushes it upward, keeping it in the position after tool setting. Finally, when the coolant pressure inside the cooling cylinder 5 becomes too high, the coolant overflow spout 504 in the left side of the cooling cylinder 5 will open, releasing the pressure, and the excess coolant will flow back into the coolant tank.

[0042] When the tool on the left-side tool holder 4 is working, the same applies as described above.

[0043] It should be noted that when the movable box 2 is adjusted up and down along the power box 1, the tools on the output shaft 8 and the output shaft 9 will not come into contact with the workpiece. Therefore, under the force of the buffer spring 401, the tool holder 4 will be pushed down and the nozzle 501 will be blocked. At this time, the coolant in the two cooling cylinders 5 will not be discharged outward, ensuring that the coolant in the cooling cylinders 5 will not be accidentally sprayed outward when the movable box 2 is adjusted in position.

Claims

1. A CNC dual-axis drilling and milling power head for machining valve bodies, characterized in that, include: The power box (1) has a power shaft (3) connected to the motor installed on the top inner side, and the output shaft (9) rotates synchronously with the power shaft (3) by means of a gear assembly (11) on the outer side of the power shaft (3); The movable box (2) is movably installed on the side of the power box (1), and the output shaft (8) is movably installed inside the movable box (2). The bottom end of the power shaft (3) is coaxially fixed with a flower shaft (10). The flower shaft (10) and the output shaft (8) are connected by a pulley assembly (13) to realize that the output shaft (8) rotates with the power shaft (3). Both the bottom ends of output shaft one (8) and output shaft two (9) are equipped with tool holders (4) for holding the tool; The output shaft 2 (9) is fitted with a screw (14) that is movably installed on the bottom of the inner side of the power box (1), and an electromagnetic fastening assembly is provided on the output shaft 2 (9) to realize the connection / disconnection between the output shaft 2 (9) and the screw (14); the screw (14) is threadedly connected to a guide frame (12) that is fastened to the movable box (2); When the output shaft 2 (9) drives the screw (14) to rotate, the screw (14) is driven by the guide frame (12) to realize the movable box (2) to drive the tool holder (4) to move up and down, thereby changing the relative position of the tools on the output shaft 1 (8) and the output shaft 2 (9).

2. The CNC dual-axis drilling and milling power head for valve body machining according to claim 1, characterized in that, The cross-sectional shape of the flower axis (10) is polygonal.

3. The CNC dual-axis drilling and milling power head for valve body machining according to claim 1, characterized in that, The electromagnetic fastening assembly includes: An electromagnet (151) is fixed to the outside of the output shaft (9) and located above the screw (14); A pressure cylinder (15) is fitted on the outside of the output shaft (9) and located above the electromagnet (151), and a reset push spring (150) is provided between the pressure cylinder (15) and the electromagnet (151); When the electromagnet (151) is energized, it generates magnetism and attracts the pressure cylinder (15) to move downward to contact the screw (14), thereby realizing the contact transmission connection between the pressure cylinder (15) and the screw (14).

4. The CNC dual-axis drilling and milling power head for valve body machining according to claim 1, characterized in that, The bottom of both the power box (1) and the movable box (2) is fixedly equipped with a cooling cylinder (5) located outside the tool holder (4), and the tool holder (4) is connected to the bottom of the two output shafts. A buffer spring (401) is movably installed between the tool holder (4) and the power box (1). A position switch (16) is fixedly installed on the top of the outer side of the cooling cylinder (5). The power box (1) pushes the tool holder (4) to press against the workpiece. When the tool holder (4) overcomes the elastic force of the buffer spring (401) and moves to the position of the position switch (16), the position of the tool holder (4) at this moment is the initial coordinate position.

5. The CNC dual-axis drilling and milling power head for valve body machining according to claim 4, characterized in that, The bottoms of both output shaft 2 (9) and output shaft 1 (8) are elliptical.

6. The CNC dual-axis drilling and milling power head for valve body machining according to claim 4, characterized in that, An axial flow fan blade (402) is movably mounted on the outside of the tool holder (4), and a one-way transmission assembly is provided between the two; a nozzle (501) for spraying coolant outward is installed at the bottom of the cooling cylinder (5), and a stepped surface for blocking the nozzle (501) is provided in the middle of the outside of the tool holder (4); A coolant inlet (502) located below the axial flow fan blade (402) is fixedly installed on the outside of the cooling cylinder (5), and a one-way valve is provided in the coolant inlet (502); A coolant drain nozzle (503) is installed on the side of the cooling cylinder (5) and above the axial flow fan blade (402), and the coolant drain nozzles (503) on the two tool holders (4) are connected to each other by a connecting pipe (6); A coolant overflow nozzle (504) is installed on the side of the cooling cylinder (5) and above the coolant discharge nozzle (503), and a pressure limiting valve is provided in the coolant overflow nozzle (504). The coolant overflow nozzles (504) on the two tool holders (4) are connected by an overflow pipe (7).

7. The CNC dual-axis drilling and milling power head for valve body machining according to claim 6, characterized in that, The overflow pipe (7) is a three-way pipe.

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