A device and method for monitoring multi-directional deformation forces during processing

Abstract

This invention discloses a device and method for monitoring multi-directional deformation forces during machining, belonging to the field of stress monitoring technology. The device includes several floating locking units for locking parts, with a deformation force monitoring unit positioned below each floating locking unit. The deformation force monitoring unit monitors the deformation force of the part during machining and is fixed to the machine tool by a clamping unit. Each floating locking unit includes a locking structure and a connecting seat. The locking structure is connected to the deformation force monitoring unit via the connecting seat, and the locking structure and connecting seat are floatingly inserted to reduce the clamping stress on the part. Using the device and method for monitoring multi-directional deformation forces during machining as described in this invention solves the problem of complex structures in existing monitoring devices, achieves stress-free clamping of parts, improves the accuracy of deformation force monitoring, and meets the deformation force measurement needs of small-sized parts.

Description

Technical Field

[0001] This invention relates to the field of stress monitoring technology, and in particular to a device and method for monitoring multi-directional deformation forces during processing. Background Technology

[0002] In the aerospace field, there are numerous frame-beam type structural parts. During the machining of these parts, the removal of material, the redistribution of initial residual stress in the blank, and the machining residual stress caused by cutting can lead to deformation of the parts. The presence of a clamping device prevents this deformation, thereby generating deformation force that acts on the clamping position. This deformation force can be used to assess the stability, stiffness, and potential deformation risk of the part during machining.

[0003] Accurate measurement of deformation forces during part machining, combined with the part's material properties and geometry, allows for the prediction of the amount of deformation that will occur during processing. This facilitates the optimization of machining parameters, clamping schemes, and other machining processes. By sensing the deformation of a part through deformation forces and using this information to adjust subsequent machining processes, the amount and degree of deformation can be reduced, which is crucial for improving part quality and extending its service life. However, in traditional fixed-clamping machining methods, the clamping stresses exerted on the part to maintain its position present a significant challenge to the accurate monitoring of deformation forces.

[0004] Existing patent CN202010747996.8 discloses a method and apparatus for accurately measuring deformation force during part processing. The clamping device clamps the part, consisting of a clamping bolt and a clamping seat. The clamping bolt connects to the part, and after connection, the other end of the clamping bolt connects to the clamping seat, thus clamping the part. The position of the clamping device is adjusted by an adjustment mechanism. The movement of the adjustment mechanism allows the motion platform to move in the X, Y, and Z directions, as well as rotate around the X and Y directions, and remains fixed in any position, thus achieving stress-free clamping. While the aforementioned patent requires an adjustment mechanism to adjust the position of the clamping device to achieve stress-free clamping, this adjustment mechanism results in a complex and large measuring device structure, making it difficult to meet the needs of measuring the deformation force of small-sized parts. Summary of the Invention

[0005] The purpose of this invention is to provide a monitoring device and method for multi-directional deformation forces during processing, thereby solving the problem of complex structures in existing monitoring devices.

[0006] To achieve the above objectives, the present invention provides a multi-directional deformation force monitoring device during machining, comprising a plurality of floating locking units for locking parts, and a deformation force monitoring unit disposed below the floating locking units. The deformation force monitoring unit is used to monitor the deformation force during the machining process of the parts, and the deformation force monitoring unit is fixed on the machine tool by a fixed clamping unit. The floating locking unit includes a locking structure and a connecting seat. The locking structure is connected to the deformation force monitoring unit through the connecting seat, and the locking structure and the connecting seat are floatingly inserted to reduce the clamping stress of the parts.

[0007] Preferably, the locking structure includes a threaded support column, with a plug at the bottom of the threaded support column. The threaded support column is inserted into the connecting seat through the plug, and a plurality of locking units are provided on the threaded support column for locking the parts onto the threaded support column.

[0008] Preferably, there are two locking units. Each locking unit includes a locking nut and a spherical washer. The spherical washer is located between the locking nut and the part, and the spherical washer is in line contact with the part. The part is locked onto the threaded support column by the two locking units.

[0009] Preferably, the diameter of the through hole at the center of the spherical gasket is not less than the outer diameter of the threaded support column, and the diameter of the through hole connecting the part and the threaded support column is greater than the inner diameter of the spherical gasket and less than the outer diameter of the spherical gasket.

[0010] Preferably, the center of the connecting seat is provided with a slot for inserting the locking structure, the connecting seat is provided with a locking component for locking the locking structure in the slot, the bottom of the connecting seat is provided with a connecting plate, the connecting seat is fixedly connected to the deformation force monitoring unit through the connecting plate, and the deformation force on the locking structure is transmitted to the deformation force monitoring unit through the connecting seat to monitor the deformation force of the part.

[0011] Preferably, the locking assembly includes an L-shaped through groove on the side wall of the connector, a deformable groove on the inner wall of the connector communicating with the bottom end of the through hole, and locking screws on the side wall of the connector to lock the side walls of the connector on both sides of the through hole, thereby locking the locking structure in the slot by the locking screws.

[0012] Preferably, the locking structure includes a connecting post, the part is sleeved on the outside of the connecting post, the diameter of the through hole connecting the part and the connecting post is not less than the outer diameter of the connecting post, the top of the connecting post is provided with a limiting block to limit the part, the part is connected to the connecting seat through the connecting post, and the part transmits the deformation force to the deformation force monitoring unit through the connecting post and the connecting seat.

[0013] Preferably, the deformation force monitoring unit includes a triaxial force sensor, a base is provided above the triaxial force sensor, the triaxial force sensor is fixedly connected to the connecting seat through the base, the triaxial force sensor monitors the deformation force of the part transmitted through the locking structure and the connecting seat, a protective shell is provided outside the triaxial force sensor to protect the triaxial force sensor, and a transmission interface is provided on the protective shell to transmit the signal of the triaxial force sensor to the host computer.

[0014] Preferably, the fixing and clamping unit includes a locking plate and a positioning plate. The deformation force monitoring unit is fixedly installed at the center of the locking plate. The lower surface of the positioning plate is provided with a positioning pin for positioning the positioning plate on the machine tool. The locking plate is provided with a strip-shaped adjustment hole. Bolts pass through the adjustment hole to fix and lock the locking plate and the positioning plate on the machine tool.

[0015] The monitoring method based on the multi-directional deformation force monitoring device during the above-mentioned processing includes the following steps:

[0016] S1. Fix the clamping unit on the machine tool according to the monitoring requirements of the parts;

[0017] S2. Insert the threaded support column of the locking structure into the connector, pass the threaded support column of the locking structure through the through hole on the part, adjust the position of the locking nut and ball washer at the bottom of the threaded support column, and make the ball washer contact with the through hole line of the part; rotate the nut and ball washer at the top of the threaded support column to lock and fix the part on the threaded support column.

[0018] Alternatively, the connecting post of the locking structure can be inserted into the connecting seat, and the connecting post can be passed through the through hole on the part. The limiting block at the top of the connecting post limits the part, and the part is located between the limiting block and the connecting seat.

[0019] S3. Rotate the locking screws on the connecting seat to lock the threaded support column or connecting column of the locking structure in the connecting seat, so as to achieve stress-free clamping of the parts.

[0020] S4. The deformation force during the part processing is transmitted to the triaxial force sensor inside the deformation force monitoring unit through the locking structure and connecting seat, and the deformation force of the part is monitored by the triaxial force sensor.

[0021] The advantages and positive effects of the multi-directional deformation force monitoring device and method described in this invention during the processing are:

[0022] 1. This invention uses a floating locking unit to lock and support the parts, ensuring the stability and reliability of the parts during the processing and improving the processing accuracy.

[0023] 2. The spherical gasket of the floating locking unit of the present invention is in line contact with the part. During the clamping process of the part, the deformation compensation of the part in multiple directions can be performed, eliminating the clamping stress of the part, which is beneficial to improving the accuracy of deformation force monitoring.

[0024] 3. The present invention, through the floating connection between the threaded support rod and the connecting seat and the line contact connection between the spherical gasket and the part, can not only eliminate clamping stress, but also has a simple structure and convenient clamping operation.

[0025] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of the monitoring device according to Embodiment 1 of the present invention;

[0027] Figure 2 This is a front view schematic diagram of the monitoring device according to Embodiment 1 of the present invention;

[0028] Figure 3 This is a three-dimensional structural diagram of the floating locking unit according to Embodiment 1 of the present invention;

[0029] Figure 4 This is a three-dimensional structural diagram of the connector in Embodiment 1 of the present invention;

[0030] Figure 5 This is a top view of the connecting seat structure according to Embodiment 1 of the present invention;

[0031] Figure 6 This is a three-dimensional structural diagram of the floating locking unit according to Embodiment 2 of the present invention;

[0032] Figure 7 This is a three-dimensional structural diagram of the deformation force monitoring unit according to Embodiment 1 of the present invention;

[0033] Figure 8 This is a three-dimensional structural diagram of the fixing and clamping unit according to Embodiment 1 of the present invention;

[0034] Figure 9 This is a front view schematic diagram of the fixing and clamping unit according to Embodiment 1 of the present invention;

[0035] Figure 10 This is a schematic diagram of the application state structure of the monitoring device in Embodiment 1 of the present invention.

[0036] Figure Labels

[0037] 1. Floating locking unit; 11. Threaded support column; 12. Spherical washer; 13. Locking nut; 14. Connecting seat; 15. Connecting plate; 16. Slot; 17. Through groove; 18. Deformation groove; 19. Locking screw; 110. Connecting column; 111. Limiting block;

[0038] 2. Deformation force monitoring unit; 21. Triaxial force sensor; 22. Base; 23. Protective shell; 24. Transmission interface;

[0039] 3. Fixed clamping unit; 31. Positioning pin; 32. Locking disc; 33. Positioning disc; 34. Adjustment hole;

[0040] 4. Parts; 5. Machine tools. Detailed Implementation

[0041] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] In this application, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. In case of any inconsistency, the meaning set forth in this specification or derived from the content described herein shall prevail. Furthermore, the terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit the scope of this application.

[0043] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0044] Example 1

[0045] like Figure 1 , Figure 2 , Figure 10 As shown, a multi-directional deformation force monitoring device during machining includes several floating locking units 1 for locking part 4. The floating locking units 1 enable stress-free clamping of part 4, eliminating clamping stress generated during clamping and thus improving the accuracy of deformation force monitoring. A deformation force monitoring unit 2 is located below the floating locking units 1, and is used to monitor the deformation force of part 4 during machining. The deformation force monitoring unit is fixed to the machine tool 5 by a fixed clamping unit 3.

[0046] like Figure 3 As shown, the floating locking unit 1 includes a locking structure and a connecting seat 14. The locking structure is connected to the deformation force monitoring unit 2 through the connecting seat 14. The locking structure and the connecting seat 14 are floatingly inserted to eliminate the clamping stress of the part 4.

[0047] The locking structure includes a threaded support post 11, with a cylindrical insert rod fixedly mounted at the bottom of the threaded support post 11. The threaded support post 11 is inserted into the connecting seat 14 via the insert rod. The insertion method between the threaded support post 11 and the connecting seat 14 allows for adjustment of the height of the threaded support post 11.

[0048] The threaded support column 11 is equipped with several locking units for securing part 4 to it. Two locking units are provided, each consisting of a locking nut 13 and a spherical washer 12. The spherical washer 12 is located between the locking nut 13 and part 4. The spherical washer 12 is in line contact with part 4, and part 4 is secured to the threaded support column 11 by the two locking units. By securing part 4 to the threaded support column 11 with the spherical washer 12 and the locking nut 13, the six degrees of freedom of part 4 during machining are restricted, providing a stable machining environment for part 4.

[0049] The diameter of the through hole at the center of the spherical washer 12 is slightly larger than the outer diameter of the threaded support column 11, allowing it to better fit the part 4 when it undergoes bending and twisting deformation, thus achieving clamping of the part 4 in all directions. The diameter of the through hole connecting the part 4 and the threaded support column 11 is larger than the inner diameter of the spherical washer 12 but smaller than its outer diameter; this is to prevent interference between the threaded support column 11 and the part 4 when it undergoes torsional deformation.

[0050] Since the parts 4 to be processed are mostly large aerospace aircraft structural components, the diameter of the threaded support column 11 should be no less than 16mm to provide sufficient rigidity and stability. The threaded connecting column 110 has threads with a depth of more than 30mm, and a suitable locking nut 13 and thread can be selected according to the size of part 4.

[0051] With the locking nut 13 providing the locking force, the spherical washer 12 directly contacts the part 4 and transmits sufficient locking force. The spherical washer 12 and the part 4 are in line contact. During the processing, the clamping is loosened in the middle according to the process requirements. After the part 4 is deformed, the spherical washer 12 can contact the through hole of the part 4 while ensuring that it is coaxial with the threaded rod, so as to ensure the safety and stability of locking the part 4.

[0052] During the processing, the locking nut 13 is loosened to release the deformation. During the release process, a certain number of floating locking units 1 are needed to keep the part 4 clamped to ensure the relative overall position of the part 4. Otherwise, the reference of the part 4 will change, affecting the processing accuracy.

[0053] like Figure 4 , Figure 5 As shown, the center of the connecting seat 14 is provided with a slot 16 for inserting the bottom end of the threaded support rod. The inner diameter of the slot 16 is slightly larger than the diameter of the rod, facilitating the insertion of the rod into the connecting seat 14. The connecting seat 14 is provided with a locking assembly that locks the locking structure into the slot 16. A connecting plate 15 is fixedly provided at the bottom of the connecting seat 14. The connecting seat 14 is fixedly connected to the deformation force monitoring unit 2 via the connecting plate 15. The deformation force on the threaded support rod is transmitted to the deformation force monitoring unit 2 through the connecting seat 14 to monitor the deformation force of the part 4.

[0054] The locking assembly includes an L-shaped through slot 17 extending through the side wall of the connector 14, and a deformable groove 18 communicating with the bottom end of the through hole on the inner wall of the connector 14, facilitating the locking of the threaded support column 11 by the connector 14. Locking screws 19 are provided on the side wall of the connector 14 to lock the side walls of the connector 14 on both sides of the through hole, thereby locking the threaded support column 11 into the slot 16. The locking force provided by the connector 14 needs to exceed 5KN to ensure the stability of the locking of the threaded support column 11.

[0055] like Figure 7 As shown, the deformation force monitoring unit 2 includes a triaxial force sensor 21. A base 22 is fixedly mounted above the triaxial force sensor 21. The triaxial force sensor 21 is fixedly connected to the connecting seat 14 through the base 22, improving the accuracy of deformation force transmission and thus improving the accuracy of deformation force monitoring by the triaxial force sensor 21. The triaxial force sensor 21 monitors the deformation force transmitted by the part 4 through the locking structure and the connecting seat 14. A protective shell 23 is provided outside the triaxial force sensor 21 to protect it and reduce the impact of cutting fluid on the triaxial force sensor 21 during machining. A transmission interface 24 is provided on the protective shell 23 to transmit the signal from the triaxial force sensor 21 to the host computer.

[0056] like Figure 8 , Figure 9 As shown, the clamping unit 3 includes a locking disc 32 and a positioning disc 33. The deformation force monitoring unit 2 is fixedly mounted at the center of the locking disc 32 by screws. A positioning pin 31 is fixedly mounted on the lower surface of the positioning disc 33 to position it on the machine tool 5, facilitating its fixed installation. The locking disc 32 has several strip-shaped adjustment holes 34, through which bolts pass to secure the locking disc 32 and the positioning disc 33 to the machine tool 5.

[0057] The monitoring method based on the multi-directional deformation force monitoring device during the above-mentioned processing includes the following steps:

[0058] S1. According to the monitoring requirements of part 4, the locking disc 32 and the fixing disc of the clamping unit 3 are fixed on the machine tool 5. The protective shell 23 of the deformation force monitoring unit 2 is fixed to the locking disc 32 with screws.

[0059] S2. Insert the insert rod at the bottom of the threaded support column 11 into the insertion hole of the connector 14, pass the threaded support column 11 through the through hole on the part 4, and adjust the position of the locking nut 13 and the ball washer 12 at the bottom of the threaded support column 11 so that the ball washer 12 contacts the through hole line of the part 4. Rotate the nut and ball washer 12 at the top of the threaded support column 11 to lock and fix the part 4 onto the threaded support column 11.

[0060] S3. Rotate the locking screw 19 on the connecting seat 14 to lock the threaded support column 11 in the connecting seat 14, so as to achieve stress-free clamping of part 4.

[0061] S4. The deformation force of part 4 during the processing is transmitted to the triaxial force sensor 21 inside the deformation force monitoring unit 2 through the locking structure and connecting seat 14. The deformation force of part 4 is monitored by the triaxial force sensor 21.

[0062] Example 2

[0063] The difference between this embodiment and Embodiment 1 is that the locking structure is different in this embodiment. For example... Figure 6 As shown, the locking structure includes a connecting post 110, with part 4 sleeved on the outside of the connecting post 110. The diameter of the through hole connecting part 4 to the connecting post 110 is not less than the outer diameter of the connecting post 110. A limiting block 111 is provided at the top of the connecting post 110 to limit the movement of part 4. The bottom end of the connecting post 110 is inserted into the slot 16 of the connecting seat 14, and the height of the connecting post 110 can be adjusted according to the needs of part 4. Part 4 is connected to the connecting seat 14 through the connecting post 110, and part 4 transmits deformation force to the deformation force monitoring unit 2 through the connecting post 110 and the connecting seat 14. The floating connection between the connecting post 110 and the connecting seat 14 helps to reduce the clamping stress of part 4.

[0064] In the monitoring method, the connecting post 110 is inserted into the connecting seat 14, the connecting post 110 passes through the through hole on the part 4, the limiting block 111 at the top of the connecting post 110 limits the part 4, the part 4 is located between the limiting block 111 and the connecting seat 14, and the connecting seat 14 locks the connecting post 110 to achieve stable clamping of the part 4.

[0065] Therefore, by using the multi-directional deformation force monitoring device and method described in this invention, the problem of complex structure of existing monitoring devices can be solved, stress-free clamping of parts can be achieved, the accuracy of deformation force monitoring of parts can be improved, and the deformation force measurement needs of small-sized parts can be met.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A monitoring device for multi-directional deformation force during processing, characterized in that: It includes several floating locking units for locking parts, and a deformation force monitoring unit is set below the floating locking unit. The deformation force monitoring unit is used to monitor the deformation force during the part processing. The deformation force monitoring unit is fixed to the machine tool by a fixed clamping unit. The floating locking unit includes a locking structure and a connecting seat. The locking structure is connected to the deformation force monitoring unit through the connecting seat. The locking structure and the connecting seat are floatingly inserted to reduce the clamping stress of the parts. The locking structure includes a threaded support column. A rod is provided at the bottom of the threaded support column. The threaded support column is inserted into the connecting seat through the rod. Several locking units are provided on the threaded support column for locking the parts onto the threaded support column. The locking unit includes a locking nut and a ball washer. The ball washer is located between the locking nut and the part, and the ball washer is in line contact with the part. The part is locked to the threaded support post by the two locking units. The center of the connector is provided with a slot for inserting the locking structure. The connector is provided with a locking component to lock the locking structure in the slot. The bottom of the connector is provided with a connecting plate. The connector is fixedly connected to the deformation force monitoring unit through the connecting plate. The deformation force on the locking structure is transmitted to the deformation force monitoring unit through the connector to monitor the deformation force of the part.

2. The monitoring device for multi-directional deformation force during processing according to claim 1, characterized in that: There are two locking units.

3. The monitoring device for multi-directional deformation force during processing according to claim 1, characterized in that: The diameter of the through hole at the center of the spherical gasket is not less than the outer diameter of the threaded support column, and the diameter of the through hole connecting the part and the threaded support column is greater than the inner diameter of the spherical gasket and less than the outer diameter of the spherical gasket.

4. The monitoring device for multi-directional deformation force during processing according to claim 1, characterized in that: The locking assembly includes an L-shaped through groove on the side wall of the connector, a deformable groove on the inner wall of the connector communicating with the bottom end of the through hole, and locking screws on the side wall of the connector to lock the side walls of the connector on both sides of the through hole. The locking structure is locked in the slot by the locking screws.

5. The monitoring device for multi-directional deformation force during processing according to claim 1, characterized in that: The deformation force monitoring unit includes a triaxial force sensor. A base is provided above the triaxial force sensor, and the triaxial force sensor is fixedly connected to the connecting seat through the base. The triaxial force sensor monitors the deformation force transmitted by the part through the locking structure and the connecting seat. A protective shell is provided outside the triaxial force sensor to protect it. The protective shell is provided with a transmission interface for transmitting the signal of the triaxial force sensor to the host computer.

6. The monitoring device for multi-directional deformation force during processing according to claim 1, characterized in that: The fixed clamping unit includes a locking plate and a positioning plate. The deformation force monitoring unit is fixedly installed at the center of the locking plate. The lower surface of the positioning plate is provided with a positioning pin for positioning the positioning plate on the machine tool. The locking plate is provided with a strip-shaped adjustment hole. Bolts pass through the adjustment hole to fix and lock the locking plate and the positioning plate on the machine tool.

7. A monitoring method based on the monitoring device for multi-directional deformation force during processing according to any one of claims 1-6, characterized in that, Includes the following steps: S1. Fix the clamping unit on the machine tool according to the monitoring requirements of the parts; S2. Insert the threaded support column of the locking structure into the connector, pass the threaded support column of the locking structure through the through hole on the part, adjust the position of the locking nut and ball washer at the bottom of the threaded support column, and make the ball washer contact with the through hole line of the part; rotate the nut and ball washer at the top of the threaded support column to lock and fix the part on the threaded support column. S3. Rotate the locking screws on the connecting seat to lock the threaded support column or connecting column of the locking structure in the connecting seat, so as to achieve stress-free clamping of the parts. S4. The deformation force during the part processing is transmitted to the triaxial force sensor inside the deformation force monitoring unit through the locking structure and connecting seat, and the deformation force of the part is monitored by the triaxial force sensor.

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