Automatic chamfering machine

Abstract

The invention discloses an automatic chamfering machine which comprises two conveying assemblies, two chamfering assemblies, a chamfering machine body, a chamfering motor, a chamfering transmission shaft, a chamfering tool, a limiting assembly, a limiting air cylinder, a limiting block and a clamping and moving mechanism, the two conveying assemblies are arranged in a bilateral symmetry mode, and the two chamfering assemblies are arranged between the conveying assemblies; the two chamfering assemblies are symmetrically arranged front and back, each chamfering assembly comprises a chamfering machine, a chamfering motor, a chamfering transmission shaft and a chamfering tool, the chamfering motors and the chamfering transmission shafts are installed in the chamfering machines, the output ends of the chamfering motors are connected with the chamfering transmission shafts, and the chamfering tools are connected with the chamfering transmission shafts. The tail end of the chamfering transmission shaft penetrates through the outside of the chamfering machine to be connected with a chamfering tool, limiting assemblies are symmetrically arranged between the two sets of chamfering assemblies in the front-back direction, each limiting assembly comprises a limiting air cylinder and two limiting blocks, two-end chamfering can be conducted at the same time, and then the machining efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of chamfering machines, in particular to the technical field of automatic chamfering machines. Background Art

[0002] A chamfering machine is a small precision machine tool specialized for chamfering and deburring products processed by methods such as milling and planing in mold manufacturing, hardware machinery, machine tool manufacturing, hydraulic parts, valve manufacturing, and textile machinery. Adopting fast machine chamfering is the trend of the development of the machinery industry.

[0003] Currently, when chamfering a workpiece, the operator generally holds the workpiece and directly operates it against the corner cutter. The disadvantages of such processing are low efficiency, time-consuming and laborious, and high risk.

[0004] To solve the problems raised in the above technology, for example, Patent Application No. CN201820097689.8 discloses a chamfering machine, including a chamfering device and a clamping device. The chamfering device includes a base, a motor, a motor mounting plate, a first cylinder, and a corner cutter. The bottom of the first cylinder is fixed on the upper surface of the base, and the piston rod of the first cylinder is fixed on the side of the motor mounting plate. The bottom of the motor mounting plate is slidably connected to the upper surface of the base; at one end of the motor mounting plate away from the first cylinder, a vertical support plate is connected. The motor is fixed on the motor mounting plate. The first cylinder pushes the motor mounting plate to move back and forth along the base through the piston rod. When the motor mounting plate is pushed out, the corner cutter performs chamfering operations. After the operations are completed, the motor mounting plate is retracted. The clamping device realizes the fixation of the object to be chamfered and meets the fixation of objects of different sizes. However, this device still has the following defects: Although the above device can improve the chamfering efficiency, the chamfering machine is not convenient for quickly replacing the chamfering head, thus making it inconvenient to use.

[0005] To solve the problems raised in the above technology, for another example, Patent Application No. CN202320450286.8 discloses a chamfering machine, including a workbench, a chamfering component, and a fixing component. A lifting component is arranged at the rear end of the top of the workbench, a transmission component is arranged at the front end of the lifting component, a chamfering component is arranged below the transmission component, and a fixing component is arranged at the front end of the top of the workbench. The fixing component is located below the chamfering component. Further, the chamfering component includes a turntable rotatably connected to the transmission component, a chamfering head fixedly connected to the turntable below through a mounting plate, and a clamp movably connected above the turntable. Through grooves and third chutes are respectively formed around the inner and outer sides of the top of the turntable. A convex block is connected in the through groove with a clearance. Through the setting of the chamfering component, the connection between the convex block and the clamp in the chamfering component is used to install the mounting plate and the turntable, thereby completing the installation of the chamfering head and solving the problem of the existing inconvenience in replacing the chamfering head. However, this device still has the following defects: Although the above device facilitates the replacement of the chamfering head, when dealing with materials such as round bars, steel pipes, and bar stocks that require chamfering at both ends, the device cannot chamfer both ends simultaneously and requires the assistance of workers, thus affecting the work efficiency. Summary of the Invention

[0006] The purpose of the present invention is to solve the problems in the prior art and propose an automatic chamfering machine that can chamfer both ends simultaneously, thereby improving the processing efficiency.

[0007] To achieve the above purpose, the present invention proposes an automatic chamfering machine, including a conveying component, a chamfering component, a chamfering machine, a chamfering motor, a chamfering transmission shaft, a chamfering tool, a limiting component, a limiting cylinder, a limiting block, and a clamping and moving mechanism. There are two groups of the conveying components and they are symmetrically arranged left and right. There are two groups of the chamfering components between the conveying components and they are symmetrically arranged front and back. The chamfering component includes a chamfering machine, a chamfering motor, a chamfering transmission shaft, and a chamfering tool. The chamfering motor and the chamfering transmission shaft are installed inside the chamfering machine. The output end of the chamfering motor is connected to the chamfering transmission shaft. The end of the chamfering transmission shaft penetrates the outside of the chamfering machine and is connected with a chamfering tool. There is a limiting component symmetrically arranged front and back between the two groups of the chamfering components. The limiting component includes a limiting cylinder and two limiting blocks. The output end of the limiting cylinder is connected with the two limiting blocks. By driving the piston movement of the limiting cylinder, the two limiting blocks are driven to approach or move away from each other. The conveying component is provided with a clamping and moving mechanism for clamping and transferring the workpiece.

[0008] Preferably, the conveying component includes a frame body, two driving sprockets, a driving chain, and a conveying motor. The driving sprockets are symmetrically arranged front and back on the inner side surface of the frame body. The driving chain is commonly wound around the outside of the driving sprockets. The conveying motor is installed on the outer side wall of the frame body. The output end of the conveying motor penetrates the inner side of the frame body and is connected with one of the driving sprockets.

[0009] Preferably, a protective cover is installed on the outside of the chamfering machine through bolts. The protective cover is located on one side of the chamfering tool.

[0010] Preferably, holes are opened on the protective cover. An oil spraying device is provided on the protective cover. The input end of the oil spraying device is connected with an external oil supply device through a pipeline. The output end of the oil spraying device is connected with an oil spraying port through a pipeline. The oil spraying port is located inside the hole and faces the direction of the chamfering tool.

[0011] Preferably, the clamping surfaces of the limiting blocks are both in a V-shaped structure and enclose a clamping hole. The size of the clamping hole is adapted to the outer wall size of the workpiece.

[0012] Preferably, the clamping and moving mechanism includes two concave brackets, a Y-axis guide rail, a Y-axis electric slider, a transverse bracket, an X-axis guide rail, an X-axis electric slider, a fixing plate, a telescopic cylinder, and a clamping component. The concave brackets are respectively arranged on the two frames. Y-axis guide rails are arranged above the concave brackets. Y-axis electric sliders are slidably engaged with the Y-axis guide rails. A transverse bracket is commonly connected between the two Y-axis electric sliders. An X-axis guide rail is arranged above the transverse bracket. Two X-axis electric sliders are slidably engaged with the X-axis guide rail. Fixing plates are connected to the side walls of the two X-axis electric sliders. Telescopic cylinders are installed below the fixing plates. Clamping components are connected to the lower ends of the telescopic cylinders through piston rods.

[0013] Preferably, the clamping component includes a clamping cylinder and two clamping blocks. The output end of the clamping cylinder is connected to the two clamping blocks. The piston is driven by the clamping cylinder to move, thereby driving the two clamping blocks to approach or separate from each other.

[0014] Preferably, the clamping surfaces of the clamping blocks are both of a V-shaped structure and enclose a clamping hole. The size of the clamping hole is adapted to the outer wall size of the workpiece.

[0015] Preferably, a fixing block is arranged between the two limiting components. The fixing block is aligned with the limiting components. A Z-axis guide rail is arranged on the fixing block. Two Z-axis sliders are slidably engaged with the Z-axis guide rail. Auxiliary fixing plates are arranged on the Z-axis sliders.

[0016] Preferably, the auxiliary fixing plates are both of a semi-circular structure and enclose a clamping hole. The size of the clamping hole is adapted to the outer wall size of the workpiece.

[0017] Advantages of the present invention: 1. Through the combined cooperation of the conveying component and the chamfering component, the present invention can automatically chamfer both ends of the workpiece. When the workpiece is cut to a suitable size by an external cutting device and falls onto the conveying component, at this time, the conveying component conveys the workpiece to directly below the clamping and moving mechanism. Subsequently, one of the telescopic cylinders is started by an external control power supply. The telescopic cylinder drives the piston rod to descend and drives the clamping component to descend to clamp the workpiece on the conveying component and transfer it to the two limiting components. At the same time, the workpiece is clamped and fixed by the limiting components and the auxiliary fixing plates to avoid rotation during the chamfering process. Subsequently, the two chamfering components simultaneously chamfer the two ends of the workpiece, thereby improving the processing efficiency. After processing is completed, the workpiece is transferred to another set of conveying components by the clamping and moving mechanism, which is convenient for subsequent processing, solving the problem that the device cannot chamfer both ends simultaneously and requires the assistance of workers, thereby affecting the work efficiency. 2. With the combined cooperation of the limiting component and the auxiliary fixing plate, the present invention can ensure the stability of the workpiece during the processing. When the limiting air cylinder applies air pressure to the piston, the piston will move outward or retract inward. When the piston moves outward, the limiting blocks on the piston approach each other to clamp the workpiece, generating a clamping force, so that the limiting component clamps both ends of the workpiece. At the same time, the motor on the Z-axis guide rail provides power for the two Z-axis sliders, so that the two Z-axis sliders approach or move away from each other on the Z-axis guide rail, and then press the auxiliary fixing plate against the outer wall in the middle of the workpiece, thus further playing a role in clamping. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the front view of an automatic chamfering machine of the present invention; Figure 2 is the schematic diagram of the conveying component of an automatic chamfering machine of the present invention; Figure 3 is the schematic diagram of the protective cover of an automatic chamfering machine of the present invention; Figure 4 is the schematic diagram of the limiting block of an automatic chamfering machine of the present invention; Figure 5 is the schematic diagram of the clamping and moving mechanism of an automatic chamfering machine of the present invention; Figure 6 is the schematic diagram of the clamping component of an automatic chamfering machine of the present invention; Figure 7 is the schematic diagram of the chamfering component of an automatic chamfering machine of the present invention; In the figure: 1 - conveying component, 101 - frame, 102 - driving sprocket, 103 - driving chain, 104 - conveying motor, 2 - chamfering component, 21 - chamfering machine, 211 - protective cover, 2111 - hole, 2112 - oil spraying device, 2113 - oil spraying port, 22 - chamfering motor, 23 - chamfering transmission shaft, 24 - chamfering tool, 3 - limiting component, 31 - limiting air cylinder, 32 - limiting block, 4 - clamping and moving mechanism, 41 - concave bracket, 42 - Y-axis guide rail, 43 - Y-axis electric slider, 44 - horizontal bracket, 45 - X-axis guide rail, 46 - X-axis electric slider, 47 - fixing plate, 48 - telescopic air cylinder, 49 - clamping component, 499 - clamping air cylinder, 450 - clamping block, 5 - fixing block, 6 - Z-axis guide rail, 7 - Z-axis slider, 8 - auxiliary fixing plate. DETAILED DESCRIPTION OF THE INVENTION

[0019] Refer to Figures 1 to 7, an automatic chamfering machine of the present invention includes a conveying assembly 1, a chamfering assembly 2, a chamfering machine 21, a chamfering motor 22, a chamfering transmission shaft 23, a chamfering tool 24, a limiting assembly 3, a limiting cylinder 31, a limiting block 32, and a clamping and moving mechanism 4. There are two groups of the conveying assemblies 1 and they are symmetrically arranged left and right. There are two groups of the chamfering assemblies 2 arranged between the conveying assemblies 1, and the two groups of the chamfering assemblies 2 are symmetrically arranged front and back. The chamfering assembly 2 includes a chamfering machine 21, a chamfering motor 22, a chamfering transmission shaft 23, and a chamfering tool 24. The chamfering motor 22 and the chamfering transmission shaft 23 are installed inside the chamfering machine 21. The output end of the chamfering motor 22 is connected to the chamfering transmission shaft 23. The end of the chamfering transmission shaft 23 penetrates the outside of the chamfering machine 21 and is connected with a chamfering tool 24. The limiting assembly 3 is symmetrically arranged front and back between the two groups of the chamfering assemblies 2. The limiting assembly 3 includes a limiting cylinder 31 and two limiting blocks 32. The output end of the limiting cylinder 31 is connected with the two limiting blocks 32. By driving the piston movement of the limiting cylinder 31, the two limiting blocks 32 are driven to approach or move away from each other. The conveying assembly 1 is provided with a clamping and moving mechanism 4 for clamping and transferring the workpiece. In this application, the input end of the chamfering motor 22 is connected to an external control power supply. Therefore, when the chamfering motor 22 drives the chamfering transmission shaft 23 to rotate, the chamfering tool 24 is driven to rotate, so as to chamfer the end of the workpiece. When the limiting cylinder 31 applies air pressure to the piston (not shown in the figure), the piston will move outwards or retract inwards. When the piston moves outwards, the limiting blocks 32 on the piston approach each other to clamp the workpiece.

[0020] Refer to Figure 2 , the conveying assembly 1 includes a frame body 101, two driving sprockets 102, a driving chain 103, and a conveying motor 104. The driving sprockets 102 are symmetrically arranged front and back on the inner side surface of the frame body 101. The driving chain 103 is commonly wound around the outside of the driving sprockets 102. The conveying motor 104 is installed on the outer side wall of the frame body 101. The output end of the conveying motor 104 penetrates the inner side of the frame body 101 and is connected with one of the driving sprockets 102. In this application, the input end of the conveying motor 104 is connected to an external control power supply. Therefore, when the conveying motor 104 drives the driving sprocket 102 to rotate, the driving chain 103 is driven to rotate, so as to drive the other driving sprocket 102 to rotate synchronously, and then drive the workpiece to move. It should be noted that a baffle is installed at the end of one of the frame bodies 101. By installing the baffle, the workpiece can be blocked, so as to avoid the workpiece continuing to move forward, and then it is convenient for the clamping and moving mechanism 4 to clamp and transfer the workpiece.

[0021] Refer to Figure 3, a protective cover 211 is installed on the outside of the chamfering machine 21 through bolts. The protective cover 211 is located on one side of the chamfering tool 24. By installing the protective cover 211, it is possible to prevent debris from splashing outwards during the chamfering of the workpiece, thereby ensuring the safety of the staff.

[0022] Refer to Figure 3 , a hole 2111 is formed in the protective cover 211. An oil injection device 2112 is provided on the protective cover 211. The input end of the oil injection device 2112 is connected to an external oil supply device through a pipeline. The output end of the oil injection device 2112 is connected to an oil injection port 2113 through a pipeline. The oil injection port 2113 is located in the hole 2111 and faces the direction of the chamfering tool 24. By setting the oil injection device 2112, lubrication treatment can be carried out during the workpiece processing, thereby ensuring the processing quality. It should be noted that an oil collection tank (not shown in the figure) is equipped directly below the oil injection port 2113 to prevent the sprayed lubricating oil from leaking out.

[0023] Refer to Figure 4 , the clamping surfaces of the limit blocks 32 are all in a V-shaped structure and enclose a clamping hole. The size of the clamping hole is adapted to the outer wall size of the workpiece. By setting the clamping surfaces of the limit blocks 32 in a V-shaped structure, the limit blocks 32 can apply all the clamping force to the outer wall of the workpiece, thereby improving the clamping effect.

[0024] Refer to Figure 1 and Figure 5 , the clamping and moving mechanism 4 includes two concave brackets 41, a Y-axis guide rail 42, a Y-axis electric slider 43, a horizontal bracket 44, an X-axis guide rail 45, an X-axis electric slider 46, a fixing plate 47, a telescopic cylinder 48 and a clamping assembly 49. The concave brackets 41 are respectively arranged on the two frames 101. Y-axis guide rails 42 are provided above the concave brackets 41. Y-axis electric sliders 43 are slidably engaged with the Y-axis guide rails 42. A horizontal bracket 44 is commonly connected between the two Y-axis electric sliders 43. An X-axis guide rail 45 is provided above the horizontal bracket 44. Two X-axis electric sliders 46 are slidably engaged with the X-axis guide rail 45. Fixing plates 47 are connected to the side walls of the two X-axis electric sliders 46. Telescopic cylinders 48 are installed below the fixing plates 47. The telescopic cylinders 48 are connected to the clamping assemblies 49 through piston rods. It should be noted that motors (not shown in the figure) are equipped on both the Y-axis guide rail 42 and the X-axis guide rail 45 to provide driving power for the Y-axis electric slider 43 and the X-axis electric slider 46, so that the Y-axis electric slider 43 and the X-axis electric slider 46 can reciprocate on the Y-axis guide rail 42 and the X-axis guide rail 45.

[0025] Refer to Figure 6, the clamping assembly 49 includes a clamping cylinder 499 and two clamping blocks 450. The output end of the clamping cylinder 499 is connected to the two clamping blocks 450. By driving the piston movement of the clamping cylinder 499, the two clamping blocks 450 are driven to approach or move away from each other. When the clamping cylinder 499 applies air pressure to the piston, the piston will move outward or retract inward. When the piston moves outward, the clamping blocks 450 on the piston approach each other to clamp the workpiece.

[0026] Refer to Figure 6 , the clamping surfaces of the clamping blocks 450 are both in a V-shaped structure and enclose a clamping hole. The size of the clamping hole is adapted to the outer wall size of the workpiece. By setting the clamping surfaces of the clamping blocks 450 in a V-shaped structure, the clamping blocks 450 can apply all the clamping force to the outer wall of the workpiece, thereby improving the clamping effect.

[0027] Refer to Figure 4 , there is a fixing block 5 between the two groups of limiting components 3. The fixing block 5 is arranged in alignment with the limiting components 3. A Z-axis guide rail 6 is provided on the fixing block 5. Two Z-axis sliders 7 are slidably engaged with the Z-axis guide rail 6. Auxiliary fixing plates 8 are provided on the Z-axis sliders 7. It should be noted that a motor (not shown in the figure) is equipped on the Z-axis guide rail 6. The motor provides driving power for the Z-axis sliders 7, so that the Z-axis sliders 7 can drive the auxiliary fixing plates 8 to approach or move away from each other.

[0028] Refer to Figure 4 , the auxiliary fixing plates 8 are both in a semi-circular structure and enclose a clamping hole. The size of the clamping hole is adapted to the outer wall size of the workpiece, which can further improve the fixing effect of the workpiece.

[0029] The working process of the present invention: During the working process of an automatic chamfering machine of the present invention, when a workpiece is cut to a suitable size by an external cutting device and then falls onto the conveying component 1, at this time, the conveying component 1 conveys the workpiece to directly below the clamping and moving mechanism 4. Subsequently, one of the telescopic cylinders 48 is started by an external control power supply. The telescopic cylinder 48 drives the piston rod to descend and drives the clamping component 49 to descend to clamp the workpiece on the conveying component 1 and transfer it to the two limiting components 3. At the same time, the workpiece is clamped and fixed by the limiting components 3 and the auxiliary fixing plate 8 to avoid rotation during the chamfering process. Subsequently, the two chamfering components 2 chamfer both ends of the workpiece simultaneously, thereby improving the processing efficiency. After the processing is completed, the workpiece is transferred to another set of conveying components 1 by the clamping and moving mechanism 4, which facilitates subsequent processing. Subsequently, the telescopic cylinder 48 is started simultaneously by an external control power supply. The telescopic cylinder 48 simultaneously drives the piston rod to descend and drives the clamping component 49 to descend. One set of clamping components 49 clamps the workpiece on the conveying component 1 and transfers it to the processing station, and the other set of clamping components 49 transfers the processed workpiece to another set of conveying components 1. By repeating this cycle, the processing efficiency can be greatly improved.

[0030] The control method of the present invention is controlled by manually starting and closing the switch. The wiring diagram of the power element and the power supply are common knowledge in the art, and the present invention is mainly used to protect mechanical devices, so the control method and wiring layout of the present invention will not be explained in detail.

[0031] The above embodiments are descriptions of the present invention, not limitations of the present invention. Any solution obtained by simply transforming the present invention belongs to the protection scope of the present invention.

Claims

1. An automatic chamfering machine, characterized in that: The invention comprises a conveying assembly (1), a chamfering assembly (2), a chamfering machine (21), a chamfering motor (22), a chamfering transmission shaft (23), a chamfering tool (24), a limit assembly (3), a limit cylinder (31), a limit block (32) and a clamping moving mechanism (4), wherein the conveying assembly (1) has two groups and is arranged symmetrically on the left and right, two groups of the chamfering assemblies (2) are arranged between the conveying assemblies (1), and the two groups of the chamfering assemblies (2) are arranged symmetrically in front and back, the chamfering assembly (2) comprises a chamfering machine (21), a chamfering motor (22), a chamfering transmission shaft (23) and a chamfering tool (24), and the chamfering machine (21) is provided with a chamfering motor (22) and a chamfering transmission shaft (23) and a chamfering tool (24). The chamfering motor (22) is connected to the chamfering drive shaft (23) at its output end, and the end of the chamfering drive shaft (23) passes through the outside of the chamfering machine (21) and is connected to a chamfering tool (24). A limit assembly (3) is symmetrically arranged between the two groups of chamfering assemblies (2). The limit assembly (3) comprises a limit cylinder (31) and two limit blocks (32). The output end of the limit cylinder (31) is connected to the two limit blocks (32). The limit cylinder (31) drives the piston to move, thereby driving the two limit blocks (32) to move closer to or farther from each other. The conveying assembly (1) is provided with a clamping and moving mechanism (4) for clamping and transferring the workpiece.

2. An automatic chamfering machine as claimed in claim 1, characterized in that: The conveying assembly (1) comprises a frame (101), two transmission sprockets (102), a transmission chain (103) and a conveying motor (104); the transmission sprockets (102) are symmetrically arranged on the inner side surface of the frame (101) in a front-to-rear manner; the transmission sprockets (102) are surrounded by the transmission chain (103) outside; the conveying motor (104) is mounted on the outer side wall of the frame (101); and the output end of the conveying motor (104) passes through the inner side of the frame (101) and is connected to one of the transmission sprockets (102).

3. An automatic chamfering machine as claimed in claim 1, characterized in that: A protective cover (211) is installed on the outside of the chamfering machine (21) by means of bolts, and the protective cover (211) is located on one side of the chamfering tool (24).

4. An automatic chamfering machine as claimed in claim 3, characterized in that: The protective cover (211) is provided with a hole (2111), and the protective cover (211) is provided with an oil spray device (2112); the input end of the oil spray device (2112) is connected to an external oil supply device via a pipeline, and the output end of the oil spray device (2112) is connected to an oil spray port (2113) via a pipeline; the oil spray port (2113) is located in the hole (2111) and faces the direction of the chamfering tool (24).

5. The automatic chamfering machine according to claim 1, characterized in that: The clamping surfaces of the limit blocks (32) are all V-shaped and enclose a clamping hole, and the size of the clamping hole is compatible with the size of the outer wall of the workpiece.

6. An automatic chamfering machine as claimed in claim 2, characterized in that: The clamping and moving mechanism (4) comprises two concave brackets (41), a Y-axis guide rail (42), a Y-axis electric slider (43), a cross bracket (44), an X-axis guide rail (45), an X-axis electric slider (46), a fixing plate (47), a telescopic cylinder (48) and a clamping assembly (49), wherein the concave brackets (41) are respectively arranged on the two frames (101), the Y-axis guide rail (42) is arranged above each of the concave brackets (41), and the Y-axis guide rail (42) is slidably matched with a Y-axis electric slider. A block (43), a cross bracket (44) is commonly connected between the two Y-axis electric sliders (43), an X-axis guide rail (45) is arranged above the cross bracket (44), the two X-axis electric sliders (46) are slidably matched on the X-axis guide rail (45), the side walls of the two X-axis electric sliders (46) are connected to a fixed plate (47), a telescopic cylinder (48) is installed below the fixed plate (47), and a clamping assembly (49) is connected below the telescopic cylinder (48) through a piston rod.

7. An automatic chamfering machine as claimed in claim 6, characterized in that: The clamping assembly (49) comprises a clamping cylinder (499) and two clamping blocks (450); the output end of the clamping cylinder (499) is connected to the two clamping blocks (450); the clamping cylinder (499) drives the piston to move, thereby driving the two clamping blocks (450) to move closer to or farther from each other.

8. An automatic chamfering machine as claimed in claim 7, characterized in that: The clamping surfaces of the clamping blocks (450) are all V-shaped and enclose a clamping hole, and the size of the clamping hole is compatible with the size of the outer wall of the workpiece.

9. The automatic chamfering machine according to claim 1, characterized in that: A fixed block (5) is provided between the two groups of the limit assemblies (3), the fixed block (5) is aligned with the limit assemblies (3), a Z-axis guide rail (6) is provided on the fixed block (5), two Z-axis slide blocks (7) are slidably engaged on the Z-axis guide rail (6), and auxiliary fixing plates (8) are provided on the Z-axis slide blocks (7).

10. An automatic chamfering machine according to claim 9, characterized in that: The auxiliary fixing plates (8) are all semicircular in structure and enclose a clamping hole, the size of the clamping hole being compatible with the size of the outer wall of the workpiece.

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