Oil drilling hole chamfering device

By designing a drilling hole chamfering device containing a multi-axis and a control device, the problems of complex operation and low efficiency in the prior art are solved, and automated operations are realized, cost reduction and efficiency are improved.

CN110711878BActive Publication Date: 2025-04-29SICHUAN YINGANG YITONG CAMSHAFT LIABILITY CO LTD
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Patent Information

Application Number
CN201911142108.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2019-11-20
Publication Date
2025-04-29
Estimated Expiration
2039-11-20

AI Technical Summary

Technical Problem

In the prior art, drilling oil holes and chamfering operations require multiple clamping and equipment replacement, resulting in high processing costs and low efficiency.

Method used

A chamfering device for drilling the oil hole is designed, including a multi-axis device and a control device. The multi-axis device is provided with a first drill bit for drilling the oil hole and a second drill bit for chamfering. The control device is used to control the rotation speed of the spindle and the movement of the pallet to realize the automation of drilling the oil hole and chamfering operations.

Benefits of technology

With this device, the drilling of oil holes and chamfering operations can be completed in just one clamping, which significantly saves processing and labor costs and improves processing efficiency.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present invention discloses an oil hole chamfering device, comprising: a multi-axis device connected to the main shaft of a lathe, a positioning tool connected to the support plate of the lathe for fixing and clamping a product, and a control device connected to the lathe. The multi-axis device is provided with a first drill bit for drilling oil holes and a second drill bit for chamfering. The control device is used to control the rotation speed of the main shaft and control the movement of the support plate. By using the oil hole chamfering device provided by the present invention, labor costs can be reduced and processing efficiency can be improved.
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Description

Technical Field

[0001] The invention relates to the technical field of mechanical industry, and more specifically to an oil drilling hole chamfering device. Background Art

[0002] In the machinery industry, when processing irregular shaft parts, it is often necessary to drill oil holes on the surface of the shaft parts, and chamfer the outside of the oil holes to further improve the performance of the shaft parts. Therefore, when processing irregular shaft parts such as camshafts and crankshafts, it is necessary to add a chamfering process after completing the oil hole drilling process.

[0003] In the prior art, the commonly used methods for drilling oil holes and chamfering are mainly: first, the product is clamped separately, the product is placed on a device for drilling oil holes, and then the oil hole drilling operation is performed on the product; after the oil hole drilling operation is completed, the product needs to be clamped separately again, the product is moved to a device specifically used for chamfering, and then the product is chamfered again. However, using this method to drill oil holes and chamfer products requires a lot of processing costs and labor costs, and the processing efficiency of the process is low. In addition, if industrial robots are used to replace manual operations, there will be problems such as large initial investment, long capital recovery period, and unclear short-term benefits.

[0004] In summary, how to provide a device that can reduce labor costs and improve processing efficiency is a problem that currently needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] In view of this, an object of the present invention is to provide an oil hole chamfering device, which can reduce labor costs and improve processing efficiency.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A device for drilling and chamfering oil holes comprises: a multi-axis device connected to the main shaft of a lathe, a positioning tool connected to the support plate of the lathe for fixing and clamping the product, and a control device connected to the lathe, wherein the multi-axis device is provided with a first drill bit for drilling oil holes and a second drill bit for chamfering, and the control device is used to control the rotation speed of the main shaft and control the movement of the support plate.

[0008] Preferably, the height of the first drill bit is the same as the height of the second drill bit, and the control device is used to control the moving distance of the support plate along the X-axis and Y-axis directions.

[0009] Preferably, the positioning tooling includes: a base connected to the pallet for fixing the product, an L-shaped support plate connected to the pallet and close to the base, and a clamping device for cooperating with the base to clamp the product, the clamping device being connected to the top of the L-shaped support plate, and a controller being provided on the clamping device to control the rise and fall of the clamping device.

[0010] Preferably, the base is detachably connected to the support plate, and the L-shaped support plate is detachably connected to the support plate.

[0011] Preferably, the clamping device includes: a support connected to the top of the L-shaped support plate for supporting the clamping device, a movable piston, a cylinder connected to the piston for driving the movement of the piston, and a top connected to the bottom of the piston for clamping the product, the cylinder is arranged on the support, the support is provided with an opening for allowing the top to pass through, and the cylinder is connected to the controller.

[0012] Preferably, the support and the L-shaped support plate are detachably connected.

[0013] Preferably, the base is provided with an opening for preliminarily fixing the product, and the size of the opening matches the size of the end of the product.

[0014] Preferably, the base is evenly provided with at least two positioning sheaths along the circumferential direction, and the positioning sheaths are used to fix the product to prevent the product from tilting.

[0015] Preferably, the multi-axis device is connected to the main shaft via a connecting plate, and a fixing piece for fixing the multi-axis device is provided on the connecting plate.

[0016] When the oil hole drilling and chamfering device provided by the present invention is used, the control device is connected to the lathe to control the rotation speed of the main shaft and the movement of the support plate. The multi-axis device is connected to the main shaft, and the multi-axis device is provided with a first drill bit for drilling oil holes and a second drill bit for chamfering. Therefore, when the control device controls the movement of the main shaft, the first drill bit and the second drill bit can be controlled to rotate.

[0017] First, the product that needs to be drilled and chamfered is placed on the positioning fixture, and then the positioning fixture is used to fix and clamp the product, so as to prevent the product from moving during the processing and affecting the processing effect; the control device is used to control the lathe's pallet to move in the direction close to the drill bit, so that the product moves synchronously with the positioning fixture, so that the product is close to and contacts the drill bit for processing; then, the pallet is controlled to continue to move, so that the product is only aligned with and contacts the first drill bit used for drilling oil holes, but not with the second drill bit, and then the rotation speed of the spindle is controlled to control the rotation of the first drill bit to achieve control of the oil hole drilling operation process; when the oil hole drilling operation is completed, the pallet is controlled to move again, so that the product is only aligned with and contacts the second drill bit used for chamfering, but not with the first drill bit, and then the rotation speed of the spindle is controlled to control the rotation of the second drill bit to achieve control of the chamfering operation process; when the chamfering operation is completed, the control device can control the pallet to move in the direction away from the drill bit, so that the product that has completed the processing operation is away from the drill bit, and then the product can be removed.

[0018] By using the oil hole drilling and chamfering device provided by the present invention, the product only needs to be clamped once, and there is no need to change the equipment. The product is placed on the positioning fixture, and then the control device is started to realize the oil hole drilling and chamfering operations. Therefore, the processing cost and labor cost can be effectively saved.

[0019] In summary, the oil hole chamfering device provided by the present invention can reduce labor costs and improve processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0021] Figure 1 This is a schematic structural diagram of the oil hole chamfering device provided by the present invention.

[0022] Figure 1 middle:

[0023] 1 is a lathe, 2 is a connecting plate, 3 is a multi-axis device, 4 is a first drill bit, 5 is a second drill bit, 6 is a product, 7 is a clamping device, 8 is an L-shaped support plate, and 9 is a base. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] The core of the present invention is to provide an oil hole chamfering device, which can reduce labor costs and improve processing efficiency.

[0026] Please refer to Figure 1 , Figure 1 This is a schematic structural diagram of the oil hole chamfering device provided by the present invention.

[0027] This specific embodiment provides an oil hole drilling and chamfering device, including: a multi-axis device 3 connected to the main shaft of the lathe 1, a positioning tool connected to the support plate of the lathe 1 for fixing and clamping the product 6, and a control device connected to the lathe 1. The multi-axis device 3 is provided with a first drill bit 4 for drilling oil holes and a second drill bit 5 for chamfering. The control device is used to control the rotation speed of the main shaft and control the movement of the support plate.

[0028] It should be noted that the product 6 here mainly refers to shaft parts, including camshafts, crankshafts, balance shafts, etc. The positioning tool is used to fix and clamp the product 6, so the structure of the positioning tool needs to match the structure of the product 6 to better fix and clamp the product 6.

[0029] Therefore, in actual use, the structure and position of the positioning tooling, the first drill bit 4 and the second drill bit 5 can be determined according to actual conditions and actual needs to ensure that after the product 6 is placed on the positioning tooling, the oil hole drilling and chamfering operations can be respectively performed on the product 6 by controlling the movement of the support plate.

[0030] First, the product 6 that needs to be drilled and chamfered is placed on the positioning fixture, and then the positioning fixture is used to fix and clamp the product 6, so as to prevent the product 6 from moving during the processing and affecting the processing effect; then, the control device is used to control the support plate of the lathe 1 to move in the direction close to the drill bit, so that the product 6 moves synchronously with the positioning fixture, so that the product 6 is close to the drill bit for the convenience of processing; then, by controlling the movement of the support plate, the product 6 is aligned and contacted only with the first drill bit 4 used for drilling the oil hole, and is not in contact with the second drill bit 5. The control device then controls the rotation speed of the spindle to control the rotation of the first drill bit 4, that is, the oil hole drilling operation process can be controlled; when the oil hole drilling operation is completed, the support plate is controlled to move so that the product 6 is only aligned and contacted with the second drill bit 5 used for chamfering, but not in contact with the first drill bit 4, and then the spindle speed is controlled to control the rotation of the second drill bit 5, that is, the chamfering operation process can be controlled; when the chamfering operation is completed, the control device can control the support plate to move in a direction away from the drill bit, so that the product 6 that has completed the processing operation is away from the drill bit, and then the product 6 can be removed.

[0031] By using the oil hole drilling and chamfering device provided by the present invention, it is only necessary to clamp the product 6 once, place the product 6 on the positioning fixture, and then start the control device to complete the oil hole drilling and chamfering operations. This process does not require the replacement of equipment and only requires the product 6 to be clamped once, thus effectively saving processing costs and labor costs.

[0032] In summary, the oil hole chamfering device provided by the present invention can reduce labor costs and improve processing efficiency.

[0033] On the basis of the above-mentioned oil hole chamfering device, preferably, the height of the first drill bit 4 is the same as the height of the second drill bit 5, and the control device is used to control the moving distance of the support plate along the X-axis and Y-axis directions.

[0034] It should be noted that the first drill bit 4 is used for drilling oil holes, the second drill bit 5 is used for chamfering, and the height of the first drill bit 4 is the same as the height of the second drill bit 5. Therefore, when the product 6 moves left and right along the X-axis direction with the support plate to approach the drill bit, it is only necessary to move the product 6 forward and backward along the Y-axis direction to perform the oil hole drilling and chamfering operations respectively. Therefore, the fixed height of the product 6 needs to match the height of the drill bit so that the drill bit can accurately perform the corresponding operation.

[0035] In addition, it should be noted that when using the oil hole drilling and chamfering device provided by the present invention, since the control device is connected to the lathe 1, it is used to control the rotation speed of the spindle and the moving distance of the support plate along the X-axis and Y-axis directions. In addition, the multi-axis device 3 is connected to the spindle, and the multi-axis device 3 is provided with a first drill bit 4 for drilling oil holes and a second drill bit 5 for chamfering. Therefore, when the control device controls the movement of the spindle, the rotation of the first drill bit 4 and the second drill bit 5 can be controlled, and the processing speed of the drill bit can be adjusted by adjusting the rotation speed of the spindle. The control device controls the distance that the support plate moves left and right along the X-axis direction, which can control the contact depth between the drill bit and the product 6, that is, the size and depth of the oil hole drilled by the drill bit can be controlled. The control device controls the distance that the support plate moves forward and backward along the Y-axis direction, which can control the product 6 to only contact with the first drill bit 4 or only contact with the second drill bit 5, that is, the product 6 can be controlled to perform oil hole drilling or chamfering operations.

[0036] It should also be noted that the movement along the X-axis direction here refers to the movement left and right in the horizontal direction, and the movement along the Y-axis direction refers to the movement forward and backward in the vertical direction of the horizontal line. In addition, the directions or positional relationships indicated by "front and back", "left and right", etc. in this application are based on the directions or positional relationships shown in the drawings, and are only for the purpose of simplifying the description and facilitating understanding, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention.

[0037] In addition, when the device provided by the present invention is used for processing, since the first drill bit 4 for drilling the oil hole and the second drill bit 5 for chamfering have the same height, and the product 6 only needs to be clamped once, and then the oil hole drilling and chamfering operations are performed respectively by moving the support plate forward and backward, which is conducive to ensuring the consistency of the processing position. Therefore, the operation sequence of drilling the oil hole and chamfering can be changed, that is, the chamfering operation can be performed first, and then the oil hole drilling operation can be performed.

[0038] Therefore, the height of the first drill bit 4 is the same as the height of the second drill bit 5, so that the control device can perform oil hole drilling and chamfering operations respectively by controlling the moving distance of the support plate along the X-axis and Y-axis directions, and finally ensure the consistency of the oil hole angle during the processing of the device, improve the concentricity of the oil hole and the chamfer, that is, the processing quality of the product 6 can be guaranteed.

[0039] On the basis of the above-mentioned oil hole chamfering device, preferably, the positioning tooling includes: a base 9 connected to the pallet for fixing the product 6, an L-shaped support plate 8 connected to the pallet and close to the base 9, and a clamping device 7 for cooperating with the base 9 to clamp the product 6, the clamping device 7 is connected to the top of the L-shaped support plate 8, and a controller is provided on the clamping device 7 to control the rise and fall of the clamping device 7.

[0040] It should be noted that the positioning tooling here includes: a base 9 connected to the pallet for fixing the product 6, an L-shaped support plate 8 connected to the pallet close to the base 9, and a clamping device 7 for cooperating with the base 9 to clamp the product 6 up and down. The clamping device 7 is connected to the top of the L-shaped support plate 8, and a controller is provided on the clamping device 7 to control the rise and fall of the clamping device 7. Therefore, after placing the product 6 on the base 9, the clamping device 7 can be controlled to descend by adjusting the controller, so that the product 6 is clamped up and down by the base 9 and the clamping device 7. Therefore, when the product 6 is drilling oil holes and chamfering operations, the rotation and position displacement will not occur, thereby ensuring the accuracy of the processing operation. When the product 6 completes the processing operation, the controller is adjusted to make the clamping device 7 rise, so that it is convenient to take the product 6.

[0041] It should also be noted that the L-shaped support plate 8 here is close to the base 9, and its top is connected to the clamping device 7, so that the clamping device 7 cooperates with the base 9 to clamp the product 6 up and down, because the L-shaped support plate 8 has a high strength and can effectively fix and support the clamping device 7. In addition, the use of the L-shaped support plate 8 for connection will facilitate assembly and debugging. The clamping device 7 is provided with a controller, which can simplify the control circuit and device structure, and is also more convenient for timely adjustment of the clamping device 7.

[0042] Therefore, in actual use, the structure and position of the base 9, L-shaped support plate 8, and clamping device 7 can be determined according to actual conditions and actual needs to ensure that the product 6 can be well fixed on the positioning tooling and will not rotate.

[0043] On the basis of the above-mentioned oil drilling hole chamfering device, preferably, the base 9 is detachably connected to the support plate, and the L-shaped support plate 8 is detachably connected to the support plate.

[0044] It should be noted that the base 9 is detachably connected to the support plate, and the L-shaped support plate 8 is detachably connected to the support plate. Therefore, the base 9 and the L-shaped support plate 8 can be fixed by screws and nuts, so as to facilitate the adjustment of the positions of the base 9 and the L-shaped support plate 8 on the support plate, and finally make the positioning tool suitable for different products 6. In addition, if the positioning tool has damaged parts, it only needs to disassemble and replace the damaged parts, and then continue to use them with the undamaged parts, finally, the service life of the device can be increased and the maintenance cost of the device can be reduced.

[0045] Based on the above-mentioned oil hole chamfering device, preferably, the clamping device 7 includes: a support connected to the top of the L-shaped support plate 8 for supporting the clamping device 7, a movable piston, a cylinder connected to the piston for driving the piston to move, and a top connected to the bottom of the piston for clamping the product 6, the cylinder is arranged on the support, the support is provided with an opening for allowing the top to pass through, and the cylinder is connected to the controller.

[0046] Therefore, by adjusting the controller, the controller can control the cylinder to start moving, and then the cylinder will drive the piston to move downward. At the same time, the top connected to the bottom of the piston will move downward synchronously, so the top can pass through the opening and contact the end of the product 6. Finally, the product 6 does not rotate under the upper and lower clamping action of the base 9 and the top, thereby ensuring the accuracy of the processing operation of the product 6. When the product 6 completes the oil hole drilling and chamfering operations, the controller can be adjusted again to make the cylinder drive the piston to move upward, and at the same time, the top will move upward. When the product 6 is no longer subject to the clamping force of the top, the product 6 can be easily removed from the base 9.

[0047] Therefore, the shape of the tip needs to match the shape of the end of the product 6 so that the tip can well clamp the product 6. In addition, the tip is used to clamp the product 6 and will be subjected to extrusion force, so the tip can be set to a material with certain wear resistance and pressure resistance to avoid the tip from being easily worn during frequent use. Therefore, in the actual application process, according to the actual situation and actual needs, the size and shape of the support, opening, tip, and the movement stroke of the piston and cylinder can be determined to ensure that the tip can well cooperate with the base 9 to clamp the product 6.

[0048] On the basis of the above-mentioned oil drilling hole chamfering device, preferably, the support and the L-shaped support plate 8 are detachably connected.

[0049] It should be noted that the support is detachably connected to the L-shaped support plate 8. Therefore, the support and the L-shaped support plate 8 can be connected by bolts and nuts, so when the clamping device 7 is damaged, the clamping device 7 can be disassembled and replaced, so as to facilitate adjustment and maintenance of the clamping device 7, thereby helping to increase the service life of the device and reduce the maintenance cost of the device.

[0050] On the basis of the above-mentioned oil drilling hole chamfering device, preferably, an opening for preliminarily fixing the product 6 is provided on the base 9 , and the size of the opening matches the size of the end of the product 6 .

[0051] It should be further explained that the base 9 is provided with an opening for preliminarily fixing the product 6, and the size of the opening matches the size of the end of the product 6. This is to allow the product 6 to be conveniently preliminarily fixed through the opening of the base 9. In addition, by preliminarily determining the position of the product 6, the position of the clamping device 7 and the height of the drill bit can be determined, so as to adjust the positions of various parts of the oil hole chamfering device in advance.

[0052] On the basis of the above-mentioned oil drilling hole chamfering device, preferably, the base 9 is evenly provided with at least two positioning sheaths along the circumferential direction, and the positioning sheaths are used to fix the product 6 to prevent the product 6 from tilting.

[0053] It should be noted that the base 9 here is evenly provided with at least two positioning sheaths along the circumferential direction, which means that with the opening as the center of the circle, two or more positioning sheaths are evenly provided along the circumferential direction on the outer circle at a certain distance from the opening, so that after the product 6 is initially fixed at the opening, it can be fixed by the positioning sheath, thereby avoiding the product 6 from tilting when it is not clamped by the clamping device 7. Therefore, the position, size, number, etc. of the positioning sheaths can be determined according to the actual situation and actual needs during actual use to ensure that the product 6 will not tilt when placed on the base 9.

[0054] On the basis of the above-mentioned oil hole chamfering device, preferably, the multi-axis device 3 is connected to the main shaft through a connecting plate 2, and a fixing piece for fixing the multi-axis device 3 is provided on the connecting plate 2.

[0055] It should be noted that the multi-axis device 3 is connected to the main shaft through a connecting plate 2, and the connecting plate 2 is provided with a fixing part for fixing the multi-axis device 3. The purpose is to fix the multi-axis device 3 by using the connecting plate 2, and the first drill bit 4 and the second drill bit 5 are arranged on the multi-axis device 3. Therefore, when the control device controls the main shaft of the machine tool to rotate, the multi-axis device 3 itself does not rotate, but the main shaft can synchronously drive the first drill bit 4 and the second drill bit 5 to rotate, thereby performing oil drilling and chamfering operations on the product 6.

[0056] It should also be noted that the first drill bit 4 and the second drill bit 5 have the same height, but there is a distance difference between them along the Y-axis direction, so the control device can control the back and forth movement of the support plate so that the product 6 only contacts the first drill bit 4 or the product 6 only contacts the second drill bit 5, and perform the oil hole drilling and chamfering operations respectively. The distance difference between the first drill bit 4 and the second drill bit 5 on the multi-axis device 3 can be determined according to actual conditions and actual needs during actual use.

[0057] In addition, it should be noted that the first drill bit 4 and the second drill bit 5 mentioned in the present application document, wherein the first and the second are only used to distinguish the difference in position, and there is no distinction in order.

[0058] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. Any combination of all embodiments provided by the present invention is within the protection scope of this invention and will not be described in detail here.

[0059] The above is a detailed introduction to the oil hole chamfering device provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A chamfering device for drilling oil holes, characterized in that: include: A multi-axis device (3) connected to the main shaft of a lathe (1), a positioning fixture connected to the support plate of the lathe (1) for fixing and clamping a product (6), and a control device connected to the lathe (1), wherein the multi-axis device (3) is provided with a first drill bit (4) for drilling oil holes and a second drill bit (5) for chamfering, and the control device is used to control the rotation speed of the main shaft and control the movement of the support plate; the product (6) includes a camshaft, a crankshaft or a balance shaft; the height of the first drill bit (4) is the same as the height of the second drill bit (5), and the control device is used to control the movement distance of the support plate along the X-axis direction to control the size and depth of the oil hole drilled by the first drill bit (4), and is used to control the movement distance of the support plate along the Y-axis direction to control the product (6) to perform oil hole drilling or chamfering operations, and the order of the oil hole drilling and chamfering operations of the product (6) is replaceable; The positioning tool comprises: a base (9) connected to the support plate for fixing the product (6), an L-shaped support plate (8) connected to the support plate and close to the base (9), and a clamping device (7) for cooperating with the base (9) to clamp the product (6), the clamping device (7) being connected to the top of the L-shaped support plate (8), and a controller being provided on the clamping device (7) to control the rise and fall of the clamping device (7); the clamping device (7) comprises: a support connected to the top of the L-shaped support plate (8) for supporting the clamping device (7), a movable piston, a cylinder connected to the piston for driving the piston to move, and a top connected to the bottom of the piston for clamping the product (6), the shape of the top matching the shape of the end of the product (6), and the top being a wear-resistant and pressure-resistant material, the cylinder being arranged on the support, the support being provided with an opening for allowing the top to pass through, and the cylinder being connected to the controller.

2. The oil hole chamfering device according to claim 1, characterized in that: The base (9) is detachably connected to the support plate, and the L-shaped support plate (8) is detachably connected to the support plate.

3. The oil hole chamfering device according to claim 2, characterized in that: The support and the L-shaped support plate (8) are detachably connected.

4. The oil drilling hole chamfering device according to any one of claims 1 to 3, characterized in that: The base (9) is provided with an opening for preliminarily fixing the product (6), and the size of the opening matches the size of the end of the product (6).

5. The oil hole chamfering device according to claim 4, characterized in that: The base (9) is evenly provided with at least two positioning sheaths along the circumferential direction, and the positioning sheaths are used to fix the product (6) to prevent the product (6) from tilting.

6. The oil drilling hole chamfering device according to any one of claims 1 to 3, characterized in that: The multi-axis device (3) is connected to the main shaft via a connecting plate (2), and a fixing piece for fixing the multi-axis device (3) is provided on the connecting plate (2).

Citation Information

Patent Citations

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