A metal fitting cutting numerical control machine tool

Abstract

The application relates to the technical field of intelligent manufacturing equipment, in particular to a metal fitting cutting numerical control machine tool. The machine tool is provided with a pneumatic chuck and an electric control tool rest, the electric control tool rest is provided with a cutting tool, the pneumatic chuck is fixedly connected with a hollow shaft, the hollow shaft is fixedly connected with an elastic sleeve, the hollow shaft is slidably connected with support frames which are uniformly distributed in the circumferential direction, the hollow shaft is detachably connected with a connecting pipe which is in communication with the hollow shaft, and the connecting pipe is fixedly connected with an electric sliding frame which slides on the machine tool. The elastic sleeve and all the support frames jointly support the metal pipe under the condition that the inner wall of the metal pipe is not subjected to friction, the elastic sleeve and all the support frames are attached to the inner walls of metal pipes of different types, the inner walls of metal pipes of different types are supported, the probability that the metal pipe is deformed due to extrusion of the cutting tool during rotation is reduced, and the cutting quality of the metal pipe is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of intelligent manufacturing equipment technology, and more specifically, to a CNC machine tool for cutting metal parts. Background Technology

[0002] In the field of intelligent machining of metal fittings, cutting metal tubular fittings is a common process. Currently, CNC machine tools are usually used in conjunction with pneumatic chucks to fix the metal fittings, and an electrically controlled tool post drives the cutter to cut the metal fittings. However, for metal fittings with different wall thicknesses, traditional three-jaw chucks can only clamp them from the outside. During the cutting process, the cutter applies a continuous radial cutting force to the fitting. For fittings that are only clamped from the outside, the part being cut lacks internal support and is prone to denting under the pressure of the cutter head, thus affecting the quality of the metal fitting cutting. If the inner wall of the metal fitting is directly supported, friction will occur between the support structure and the metal fitting during the rotation of the metal fitting. If the support structure rotates synchronously with the metal fitting, the shape of the support structure will be fixed, making it difficult to adapt to the inner walls of different types of metal fittings. Summary of the Invention

[0003] In order to overcome the shortcomings pointed out in the background art above, the present invention provides a CNC machine tool for cutting metal parts.

[0004] The technical solution is as follows: A CNC machine tool for cutting metal parts includes a machine tool, a pneumatic chuck and an electrically controlled tool post, a cutting tool mounted on the electrically controlled tool post, a hollow shaft fixedly connected to the pneumatic chuck, an elastic sleeve fixedly connected to the hollow shaft, and circumferentially evenly distributed support frames slidably connected to the hollow shaft. All sliding connection points of the support frames on the hollow shaft are connected to its interior. The support frames are located inside the elastic sleeve. A connecting pipe is detachably connected to the hollow shaft and communicates with it. An electric slide carriage that slides on the machine tool is fixedly connected to the connecting pipe. The connecting pipe is used to inject gas into the hollow shaft to push all the support frames to move. The support frames are used to compress the elastic sleeve to deform, causing the elastic sleeve to expand.

[0005] Preferably, the support frame consists of a helical rod and a sliding rod, with the sliding rod located in the middle of the support frame.

[0006] Preferably, the projections of two adjacent support frames on the pneumatic chuck overlap.

[0007] Preferably, branch rods are fixed to both ends of the support frame, and the branch rods are located between two adjacent support frames. The branch rods are used to assist the support frame in supporting the elastic sleeve.

[0008] Preferably, a cavity is provided between the elastic sleeve and the hollow shaft, and the cavity is in communication with the hollow shaft.

[0009] Preferably, the cutter is provided with a plurality of stepped portions spaced apart, and the distance between all the stepped portions and the axis of the hollow shaft decreases sequentially from the point closer to the pneumatic chuck to the point farther away.

[0010] Preferably, the cutter is slidably connected to a sliding rod, a first pressure sensor is fixedly connected inside the cutter, and a first elastic element is fixedly connected between the sliding rod and the first pressure sensor.

[0011] Preferably, the sliding rod is provided with a frustum portion, and a ball bearing is installed on the side of the frustum portion near the rotation axis on the hollow shaft. The distance between the frustum portion and the pneumatic chuck is greater than the distance between any of the stepped portions and the pneumatic chuck.

[0012] Preferably, the electrically controlled cutter holder is equipped with a second pressure sensor, the cutter is slidably connected to the electrically controlled cutter holder, a second elastic element is fixedly connected between the second pressure sensor and the cutter, a limit block is slidably connected to the electrically controlled cutter holder, the limit block is used to limit the cutter, the electrically controlled cutter holder is equipped with an electric push rod, the telescopic part of the electric push rod is fixedly connected to a limit rod, the limit block and the limit rod are slidably connected, and there is frictional resistance between the limit block and the limit rod.

[0013] Preferably, the limiting block is provided with a first inclined surface, and the cutter is provided with a second inclined surface. The first inclined surface is used to press against the second inclined surface so that the cutter moves slowly.

[0014] The beneficial effects of the present invention using the above structure are as follows: 1. The present invention supports the metal pipe fittings together with the elastic sleeve and all the support frames. Under the premise that the inner wall of the metal pipe fittings is not rubbed, the elastic sleeve and all the support frames fit into the inner wall of different models of metal pipe fittings and support the inner wall of different models of metal pipe fittings, thereby reducing the probability of the metal pipe fittings being deformed by the cutting blade during rotation, and thus ensuring the quality of metal pipe fitting cutting.

[0015] 2. By using the gas inside the elastic sleeve and all the branch rods, the position between two adjacent support frames on the elastic sleeve is supported, thereby increasing the support area of ​​the inner wall of the metal pipe, dispersing the stress at the cutting point of the metal pipe, reducing the probability of the metal pipe being deformed under pressure, and improving the quality of the metal pipe after cutting.

[0016] 3. By using several stepped sections to cut the metal pipe layer by layer, the pressure generated when the cutter cuts the surface of the metal pipe is dispersed, ensuring the cutting efficiency of the metal pipe while reducing the probability of the metal pipe being crushed.

[0017] 4. By monitoring the pressure changes received by the first pressure sensor, the deformation of the metal pipe and the wear of the cutter are monitored in real time to ensure the normal cutting of the metal pipe. When the surface of the metal pipe shows a tendency to deform, the cutter is temporarily moved away from the metal pipe to reduce the probability of the cutter damaging the surface of the metal pipe. The cutter is then slowly reset to perform layer-by-layer slow cutting on the easily deformable parts of the metal pipe, thereby ensuring the quality of the metal pipe after cutting. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a three-dimensional structural diagram of the pneumatic chuck and electrically controlled tool holder of the present invention;

[0020] Figure 3 This is a three-dimensional structural diagram of the elastic sleeve of the present invention;

[0021] Figure 4 This is a three-dimensional structural diagram of the cutter of the present invention;

[0022] Figure 5 This is a three-dimensional structural cross-sectional view of the hollow shaft, elastic sleeve, and connecting tube of the present invention;

[0023] Figure 6 This is an exploded three-dimensional view of the hollow shaft and elastic sleeve of the present invention;

[0024] Figure 7 This is a three-dimensional structural diagram of the support frame of the present invention;

[0025] Figure 8 This is a three-dimensional structural diagram of the limiting block of the present invention;

[0026] Figure 9 This is a three-dimensional cross-sectional view of the cutter of the present invention.

[0027] The markings in the diagram are as follows: 1-Machine tool, 2-Pneumatic chuck, 3-Electrically controlled tool post, 4-Cutter, 5-Hollow shaft, 6-Elastic sleeve, 7-Support frame, 8-Connecting pipe, 801-Electric slide, 9-Branch rod, 10-Cavity, 11-Stepped section, 12-Sliding rod, 13-First pressure sensor, 14-First elastic element, 15-Frustum section, 16-Second pressure sensor, 17-Second elastic element, 18-Limiting block, 19-Electric push rod, 20-Limiting rod, 21-First inclined plane, 22-Second inclined plane. Detailed Implementation

[0028] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0029] Example 1

[0030] During the cutting process of metal pipes, the cutter applies a continuous radial cutting force to the pipe. For pipes that are only clamped from the outside, the part being cut lacks internal support and is very easy to be dented under the pressure of the cutter head, thus affecting the quality of the metal cutting.

[0031] A CNC machine tool for cutting metal parts, such as Figures 1-7 As shown, the machine tool includes a machine tool 1, which is equipped with a control terminal. The machine tool 1 also has a pneumatic chuck 2 and an electrically controlled tool post 3, both electrically connected to the control terminal. The pneumatic chuck 2 is used to fix metal pipe fittings. The electrically controlled tool post 3 is equipped with a cutting blade 4, which is used to drive the cutting blade 4 to move horizontally. A hollow shaft 5 is fixedly connected to the pneumatic chuck 2, and an elastic sleeve 6 is fixedly connected to the hollow shaft 5. A circumferentially evenly distributed support frame 7 is slidably connected to the hollow shaft 5, with all sliding connections of the support frame 7 communicating with its interior. The support frame 7 is located within the elastic sleeve 6. A connecting pipe 8 is detachably connected to the hollow shaft 5 and communicates with it. An electric slide 801, which slides on the machine tool 1, is fixedly connected to the connecting pipe 8. The electric slide 801 is electrically connected to the control terminal. The connecting pipe 8 communicates with an external air injection device, which is an existing structure and not shown in the figure. The pneumatic equipment is electrically connected to the control terminal. After the hollow shaft 5 and the elastic sleeve 6 are inserted into the metal pipe, the connecting pipe 8 is inserted into the hollow shaft 5, making the hollow shaft 5 and the connecting pipe 8 rotatably connected. The external pneumatic equipment injects gas into the hollow shaft 5 through the connecting pipe 8. The gas pushes all the support frames 7 to move. The support frames 7 compress the elastic sleeve 6 to deform, causing the elastic sleeve 6 to expand so that the elastic sleeve 6 fits against the inner wall of different types of metal pipes. Since the support frame 7 is composed of a helical rod and a sliding rod, and the sliding rod of the support frame 7 is located in the middle of the support frame 7, the elastic sleeve 6 expands more roundedly during the process of all the support frames 7 opening the elastic sleeve 6, thereby increasing the area of ​​the elastic sleeve 6 supporting the metal pipe. The projections of two adjacent support frames 7 on the pneumatic chuck 2 overlap, providing circumferential support for the elastic sleeve 6 and strengthening the support force of the elastic sleeve 6 on the metal pipe.

[0032] like Figures 5-7 As shown, branch rods 9 are fixed to both the left and right ends of the support frame 7. The branch rods 9 are located between two adjacent support frames 7 and are used to support the position between the two support frames 7 on the elastic sleeve 6, so as to assist the support frame 7 in supporting the elastic sleeve 6.

[0033] like Figure 5 and Figure 6 As shown, a chamber 10 is provided between the elastic sleeve 6 and the hollow shaft 5. The chamber 10 is connected to the hollow shaft 5. During the process of the elastic sleeve 6 expanding and supporting the inner wall of the metal pipe, gas is allowed to enter the chamber 10 and support the elastic sleeve 6 through the gas.

[0034] The specific working principle is as follows:

[0035] When the operator needs to use this device to cut metal pipes, the operator activates the electric slide 801 via the control terminal. The electric slide 801 moves the connecting pipe 8 to the right, fixing the metal pipe on the pneumatic chuck 2 and inserting the hollow shaft 5 and elastic sleeve 6 into the metal pipe. Then, the operator moves the connecting pipe 8 to the left to reset via the electric slide 801. After the connecting pipe 8 is connected to the hollow shaft 5, the operator activates the external gas injection device via the control terminal. The external gas injection device injects gas into the hollow shaft 5 through the connecting pipe 8. The gas pushes all the support frames 7, causing all the support frames 7 to squeeze the elastic sleeve 6. The elastic sleeve 6 expands and adheres tightly to the inner wall of the metal pipe, supporting the inner wall of the metal pipe. Then, the external gas injection device is turned off via the control terminal.

[0036] After the elastic sleeve 6 fits against the inner wall of the metal pipe, the pneumatic chuck 2 and the electric control tool holder 3 are activated through the control terminal. The pneumatic chuck 2 drives the metal pipe to rotate, and the electric control tool holder 3 drives the cutter 4 to move horizontally, so that the cutter 4 moves to the left and forward relative to the metal pipe to cut the metal pipe.

[0037] During the cutting process of metal pipe fittings, the pneumatic chuck 2 drives the elastic sleeve 6 to rotate through the hollow shaft 5, so that the elastic sleeve 6 rotates synchronously with the metal pipe fitting. The elastic sleeve 6 and all the support frames 7 together support the metal pipe fitting. Under the premise that the inner wall of the metal pipe fitting is not rubbed, the elastic sleeve 6 and all the support frames 7 are made to fit the inner wall of different models of metal pipe fittings, and support the inner wall of different models of metal pipe fittings, thereby reducing the probability of deformation of the metal pipe fittings due to the pressure of the cutter 4 during rotation, and thus ensuring the quality of metal pipe fitting cutting.

[0038] After the gas enters the hollow shaft 5, it enters the chamber 10, causing the elastic sleeve 6 to expand. Through the gas in the elastic sleeve 6 and all the branch rods 9, the position between two adjacent support frames 7 on the elastic sleeve 6 is supported, thereby increasing the support area of ​​the inner wall of the metal pipe, dispersing the stress at the cutting point of the metal pipe by the cutter 4, reducing the probability of the metal pipe being deformed under pressure, and improving the quality of the metal pipe after cutting.

[0039] After the metal pipe is cut, the operator closes the pneumatic chuck 2 and the electric tool holder 3 via the control terminal, and opens the electric slide 801 via the control terminal. The electric slide 801 moves the connecting pipe 8 to the right, causing the connecting pipe 8 to disengage from the hollow shaft 5. After the electric slide 801 returns to its original position, it is closed via the control terminal. The elastic sleeve 6 springs back to its original position, the gas in the chamber 10 is discharged, all support frames 7 move back to their original position, and the gas in the hollow shaft 5 is discharged, so that the elastic sleeve 6 no longer adheres to the metal pipe. The operator removes the metal pipe and flips it over. The above steps are repeated to cut the left side of the metal pipe. After the metal pipe is cut, it is collected.

[0040] Example 2

[0041] Based on Example 1, such as Figure 9 As shown, the cutter 4 is provided with several stepped sections 11 spaced apart. The distance between all the stepped sections 11 and the axis of the hollow shaft 5 decreases from left to right. During the process of the cutter 4 moving to the left to cut the metal pipe, the metal pipe is cut layer by layer through the stepped sections 11 to disperse the pressure generated when the cutter 4 cuts the surface of the metal pipe, thereby ensuring the cutting efficiency of the metal pipe and reducing the probability of the metal pipe being crushed.

[0042] like Figure 8 and Figure 9 As shown, the cutter 4 is slidably connected to a sliding rod 12. A first pressure sensor 13, electrically connected to a control terminal, is fixedly connected inside the cutter 4. A first elastic element 14, which is a compression spring, is fixedly connected between the sliding rod 12 and the first pressure sensor 13. The sliding rod 12 is provided with a frustum 15, and a ball bearing is installed on the front side of the frustum 15. During the rotation of the metal pipe, the ball bearing of the frustum 15 rotates to prevent the surface of the metal pipe from being scratched. When the ball bearing of the frustum 15 is in contact with the metal pipe, the first elastic element 14 is in a compressed and stored state. The distance between the frustum 15 and the pneumatic chuck 2 is greater than the distance between any step portion 11 and the pneumatic chuck 2. When all the step portions 11 pass through the metal pipe and are cut... Afterwards, the frustum 15 moves to the cutting location of the metal pipe. If the metal pipe is dented due to pressure, when the sliding rod 12 moves to the dent, the first elastic element 14 pops out, causing the sliding rod 12 to move into the dent of the metal pipe. The pressure on the first pressure sensor 13 decreases. If the cutter 4 wears, when the cutter 4 is pressed against the metal pipe, the sliding rod 12 presses against the metal pipe, increasing the pressure on the first elastic element 14 and increasing the pressure on the first pressure sensor 13. By monitoring the pressure changes on the first pressure sensor 13, the deformation of the metal pipe and the wear of the cutter 4 are monitored in real time, so that the operator can replace the damaged pipe or cutter 4 in a timely manner, thereby ensuring the normal cutting of the metal pipe.

[0043] Example 3

[0044] Based on Example 2, such as Figure 8 and Figure 9 As shown, the electrically controlled cutter holder 3 is equipped with a second pressure sensor 16 electrically connected to the control terminal. The cutter 4 is slidably connected to the electrically controlled cutter holder 3. A second elastic element 17, which is a compression spring, is fixed between the second pressure sensor 16 and the cutter 4. A limit block 18 is slidably connected to the electrically controlled cutter holder 3. Initially, the electrically controlled cutter holder 3 limits the cutter 4 to prevent it from moving forward. The limit block 18 limits the cutter 4 to apply resistance to its backward movement. The electrically controlled cutter holder 3 is equipped with an electric push rod 19 electrically connected to the control terminal. A limit rod 20 is fixedly connected to the telescopic part of the electric push rod 19. The limit block 18 and the limit rod 20 are slidably connected. There is frictional resistance between the limit block 18 and the limit rod 20. The limit block 18 is provided with a first inclined surface 21, and the cutter 4 is provided with a second inclined surface 22. When the cutter 4 squeezes the metal pipe, causing the metal pipe to deform, the metal pipe moves backward. The inner recess is held in place by the elastic sleeve 6, and the cutter 4 is subjected to a greater reaction force. The second inclined surface 22 presses against the first inclined surface 21, causing the limiting block 18 to overcome the frictional resistance between itself and the limiting rod 20. The limiting block 18 moves to the left relative to the limiting rod 20. The cutter 4 presses against the second elastic element 17, causing a change in the pressure on the second pressure sensor 16. The control terminal receives the instruction from the second pressure sensor 16 and activates the electric push rod 19. The telescopic part of the electric push rod 19 retracts and drives the limiting rod 20 to move to the right, causing the limiting rod 20 to drive the limiting block 18 to move to the right. The first inclined surface 21 presses against the second inclined surface 22, causing the cutter 4 to move slowly. When the surface of the metal pipe tends to deform, the movement of the cutter 4 reduces the probability of the cutter 4 damaging the surface of the metal pipe and causes the cutter 4 to slowly reset. The cutter 4 is slowly cut layer by layer at the easily deformable parts of the metal pipe, thereby ensuring the quality of the metal pipe after cutting.

[0045] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A CNC machine tool for cutting metal parts, comprising a machine tool (1), wherein the machine tool (1) is equipped with a pneumatic chuck (2) and an electrically controlled tool post (3), wherein the electrically controlled tool post (3) is equipped with a cutting tool (4), characterized in that, The pneumatic chuck (2) is fixedly connected to a hollow shaft (5), the hollow shaft (5) is fixedly connected to an elastic sleeve (6), the hollow shaft (5) is slidably connected to a circumferentially evenly distributed support frame (7), the hollow shaft (5) is connected to the interior of all the support frames (7) at the sliding connection points, the support frame (7) is located inside the elastic sleeve (6), the hollow shaft (5) is detachably connected to a connecting pipe (8) communicating with it, the connecting pipe (8) is fixedly connected to an electric slide (801) that slides on the machine tool (1), the connecting pipe (8) is used to inject gas into the hollow shaft (5) to push all the support frames (7) to move, the support frame (7) is used to squeeze the elastic sleeve (6) to deform, so that the elastic sleeve (6) expands; The electric control knife holder (3) is equipped with a second pressure sensor (16). The cutter (4) is slidably connected to the electric control knife holder (3). A second elastic element (17) is fixed between the second pressure sensor (16) and the cutter (4). The electric control knife holder (3) is slidably connected to a limit block (18). The limit block (18) is used to limit the cutter (4). The electric control knife holder (3) is equipped with an electric push rod (19). The telescopic part of the electric push rod (19) is fixedly connected to a limit rod (20). The limit block (18) and the limit rod (20) are slidably connected. There is frictional resistance between the limit block (18) and the limit rod (20). The limiting block (18) is provided with a first inclined surface (21), and the cutter (4) is provided with a second inclined surface (22). The first inclined surface (21) is used to press the second inclined surface (22) so that the cutter (4) moves slowly.

2. A metal fitting cutting NC machine tool according to claim 1, wherein The support frame (7) is composed of a helical rod and a sliding rod, with the sliding rod of the support frame (7) located in the middle of the support frame (7).

3. A metal fitting cutting NC machine tool according to claim 2, wherein The projections of two adjacent support frames (7) on the pneumatic chuck (2) overlap.

4. A metal fitting cutting NC machine tool according to claim 3, wherein Both ends of the support frame (7) are fixedly connected to branch rods (9). The branch rods (9) are located between two adjacent support frames (7). The branch rods (9) are used to assist the support frame (7) in supporting the elastic sleeve (6).

5. A metal fitting cutting NC machine tool according to claim 1, wherein A cavity (10) is provided between the elastic sleeve (6) and the hollow shaft (5), and the cavity (10) is connected to the hollow shaft (5).

6. A metal fitting cutting NC machine tool according to claim 1, wherein The cutter (4) is provided with a number of stepped sections (11) spaced apart, and the distance between all the stepped sections (11) and the axis of the hollow shaft (5) decreases sequentially from the point closer to the pneumatic chuck (2) to the point further away.

7. A metal fitting cutting NC machine tool according to claim 6, wherein The cutter (4) is slidably connected to a sliding rod (12), a first pressure sensor (13) is fixedly connected inside the cutter (4), and a first elastic element (14) is fixedly connected between the sliding rod (12) and the first pressure sensor (13).

8. A metal fitting cutting NC machine tool according to claim 7, wherein The sliding rod (12) is provided with a circular truncated cone part (15) which is installed with a ball bearing near one side of the rotating axis of the hollow shaft (5), and the distance between the circular truncated cone part (15) and the pneumatic chuck (2) is greater than the distance between any step part (11) and the pneumatic chuck (2).

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