Workpiece positioning support tooling and control method

Abstract

This invention belongs to the field of tooling and fixture technology, and discloses a workpiece positioning and support fixture and its control method. In the workpiece positioning and support fixture, when placing a workpiece, the workpiece can be placed on multiple support members, which are arranged in a rectangular array to support the workpiece. Different combinations of support members can support workpieces of different shapes or sizes to adapt to workpieces of different specifications. In addition, multiple parts of the workpiece can be supported simultaneously to improve the uniformity of workpiece support. In this workpiece positioning and support fixture, two clamping plates can be driven to move closer to each other along a first direction by a first driving member to clamp the workpiece and complete the positioning. At the same time, the two support plates of the support mechanism can support the parts of the workpiece close to the two clamping plates, and can support the edge parts or local areas of irregular structures of the workpiece, thereby improving the stability of the support.

Description

Technical Field

[0001] This invention relates to the field of tooling and fixture technology, and in particular to workpiece positioning and support tooling and its control method. Background Technology

[0002] In the manufacturing of subway vehicles, the processing quality of metal components is crucial to the safe operation and service life of the vehicles. Subway vehicle metal components often have diverse structures, large size differences, and uneven weight distribution. Before cutting these metal components, they need to be stably clamped and supported.

[0003] Currently, traditional fixtures generally consist of two modules: clamping and support. The clamping module is used to clamp the workpiece, and the support module is used to provide support. However, there are some problems with them. On the one hand, the support module of the fixture has a fixed structure, and different fixtures need to be changed when processing workpieces of different specifications. On the other hand, during the cutting process, the center of gravity of the workpiece will change as the cutting progresses, which can easily lead to uneven force on the workpiece, resulting in deformation or displacement. Summary of the Invention

[0004] According to one aspect of the present invention, a workpiece positioning support fixture is provided to adapt to workpieces of different specifications, while avoiding deformation of the workpiece due to uneven force.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] The workpiece positioning and support fixture includes:

[0007] Base;

[0008] The clamping mechanism includes two clamping plates slidably disposed on the base along a first direction and a first driving member for driving the two clamping plates to move closer to each other or further away from each other along the first direction. When the two clamping plates move closer to each other along the first direction, they can clamp the workpiece.

[0009] The support mechanism includes two pallets, which are movably connected to the two clamping plates in a one-to-one correspondence and are used to support the lower surface of the workpiece. The support mechanism also includes a second driving member for driving the two pallets to move relative to the clamping plates.

[0010] Multiple support members are arranged in a rectangular array. Each support member includes a support block that is slidably disposed on the base in a vertical direction and a third driving member for driving the support block to move. The support block is used to support the lower surface of the workpiece.

[0011] As a preferred embodiment of the workpiece positioning support fixture, the first driving component includes a lead screw that can rotate relative to the base and a drive motor for driving the lead screw to rotate. The lead screw includes a forward threaded section and a reverse threaded section arranged sequentially along a first direction, and the two clamping plates are respectively threadedly connected to the forward threaded section and the reverse threaded section.

[0012] As a preferred embodiment of the workpiece positioning support fixture, the base is further provided with a sliding groove extending along a first direction, both clamping plates are slidably engaged with the sliding groove, and the lead screw is disposed within the sliding groove.

[0013] As a preferred embodiment of the workpiece positioning support fixture, the second driving component includes two linear driving mechanisms, two clamping plates, and two trays corresponding to each other. The trays are rotatably mounted on the clamping plates, and the linear driving mechanisms are capable of reciprocating extension and retraction. One end of the linear driving mechanism is rotatably connected to the clamping plate, and the other end is rotatably connected to the tray.

[0014] As a preferred embodiment of the workpiece positioning support fixture, the base is also provided with multiple receiving slots, and multiple supporting members are provided in one-to-one correspondence with the multiple receiving slots. The support block slides in cooperation with the receiving slot, and the third driving member is disposed in the receiving slot.

[0015] According to another aspect of the present invention, a workpiece positioning support fixture control method is provided, implemented by the aforementioned workpiece positioning support fixture, the workpiece positioning support fixture control method comprising:

[0016] S100: Determine that the workpiece has been placed on the plurality of supports; wherein the supports for supporting the workpiece are working supports;

[0017] S110: Obtain the weight of the workpiece and the shape of the lower surface of the workpiece;

[0018] S120: Obtain the type of the workpiece and the corresponding preset clamping force;

[0019] S130: The workpiece is clamped by the clamping mechanism, and the clamping force of the two clamping plates is the preset clamping force; and the extension length of the support block of each working support is adjusted so that the pressure on the support block of each working support is consistent.

[0020] S140: Begin cutting the workpiece;

[0021] S150: Obtain the pressure exerted on the support block of each of the working supports;

[0022] S160: Determine whether there is an increase in pressure on the support block of the working support and the rate of increase is greater than a preset rate;

[0023] If so, proceed to step S170;

[0024] S170: The support block of the working support member whose pressure is increased by raising the pressure.

[0025] As a preferred embodiment of the workpiece positioning support fixture control method, it also includes the following steps following step S170:

[0026] S180: Adjust the extension length of the support block of each of the working supports to make the pressure on the support block of each of the working supports consistent, and return to step S150.

[0027] As a preferred embodiment of the workpiece positioning support tooling control method, multiple clamping mechanisms and multiple support mechanisms are provided, and the multiple clamping mechanisms and multiple support mechanisms are provided in a one-to-one correspondence.

[0028] The workpiece positioning support fixture control method also includes a step that starts executing synchronously with step S150 after step S140:

[0029] S200: Obtain the distance between each of the clamping mechanisms and the cutting position along the second direction; wherein the first direction is perpendicular to the second direction;

[0030] S210: Determine whether the distance between the clamping mechanism and the cutting position along the second direction is less than a preset distance;

[0031] If so, proceed to step S220;

[0032] S220: Reduce the clamping force of the two clamping plates of the clamping mechanism when the distance from the cutting position along the second direction is less than a preset distance.

[0033] As a preferred embodiment of the workpiece positioning support tooling control method, multiple clamping mechanisms and multiple support mechanisms are provided, and the multiple clamping mechanisms and multiple support mechanisms are provided in a one-to-one correspondence.

[0034] The workpiece positioning support fixture control method also includes a step that starts executing synchronously with step S150 after step S140:

[0035] S300: Simultaneously acquire the clamping force of the two clamping plates of each clamping mechanism, the pressure on the support plate of each support mechanism, and the pressure on the support block of each working support member.

[0036] S310: Determine whether the clamping force of the two clamping plates of the clamping mechanism is greater than the first preset pressure, determine whether the pressure on the support plate of the support mechanism is greater than the second preset pressure, and determine whether the pressure on the support block of the working support component is greater than the third preset pressure.

[0037] If the clamping force of the two clamping plates of the clamping mechanism is greater than the first preset pressure, or if the pressure on the support plate of the support mechanism is greater than the second preset pressure, or if the pressure on the support block of the working support is greater than the third preset pressure, then step S320 is executed.

[0038] S320: Suspend cutting operations.

[0039] As a preferred embodiment of the workpiece positioning support tooling control method, the clamping plate is provided with a first pressure sensor, which is used to acquire the pressure on the clamping plate; the support plate is provided with a second pressure sensor, which is used to acquire the pressure on the support plate; and the support block is provided with a third pressure sensor, which is used to acquire the pressure on the support block.

[0040] The workpiece positioning support fixture control method also includes a step that starts executing synchronously with step S150 after step S140:

[0041] S330: Determine if there is a pressure sensor malfunction or mechanical jamming, and proceed to step S320.

[0042] The beneficial effects of this invention are:

[0043] This invention provides a workpiece positioning and support fixture, including a base, a clamping mechanism, a support mechanism, and multiple support members. The clamping mechanism includes two clamping plates slidably disposed on the base along a first direction and a first driving member for driving the two clamping plates to move closer or further apart along the first direction. When the two clamping plates move closer together along the first direction, the workpiece is clamped. The support mechanism includes two support plates, which are movably connected to the two clamping plates in a one-to-one correspondence and are used to support the lower surface of the workpiece. The support mechanism also includes a second driving member for driving the two support plates to move relative to the clamping plates. The multiple support members are arranged in a rectangular array. Each support member includes a support block slidably disposed on the base along a vertical direction and a third driving member for driving the support block to move. The support block is used to support the lower surface of the workpiece. When placing a workpiece, the workpiece can be placed on the multiple support members, which support the workpiece by the rectangular array. Different combinations of support members can support workpieces of different shapes or sizes to adapt to workpieces of different specifications. In addition, multiple parts of the workpiece can be supported simultaneously to improve the uniformity of workpiece support. In this workpiece positioning support fixture, the first driving component can drive the two clamping plates to move closer to each other along the first direction to clamp the workpiece and complete the positioning. At the same time, the two support plates of the support mechanism can support the part of the workpiece close to the two clamping plates, and can support the edge part of the workpiece or the local area of ​​the irregular structure, thereby improving the stability of the support.

[0044] This invention also provides a workpiece positioning support fixture control method. Through the implementation of the aforementioned workpiece positioning support fixture, the workpiece positioning support fixture control method determines that the workpiece has been placed on multiple supports; wherein, the supports used to support the workpiece are working supports; the weight of the workpiece and the shape of the lower surface of the workpiece can be obtained based on the pressure on the blocks of the working supports and the distribution of the working supports; then, the obtained weight of the workpiece and the shape of the lower surface of the workpiece can be compared with parameters in a database to determine the type of workpiece and obtain the corresponding preset clamping force; the workpiece is clamped by a clamping mechanism, and the clamping force of the two clamping plates is the preset clamping force, thereby adjusting the clamping force based on different specifications of workpieces to apply the clamping force to the two clamping plates. The clamping force on the workpiece is moderate; the extension length of the support blocks of each working support is adjusted to ensure that the pressure on the support blocks of each working support is consistent, so that multiple parts of the workpiece are supported simultaneously by multiple working supports to improve the uniformity of workpiece support; the workpiece is cut; the pressure on the support blocks of each working support is obtained; it is determined whether there is an increase in the pressure on the support blocks of any working support and the rate of increase is greater than the preset rate; if so, it indicates that the pressure on the support blocks of a certain working support or a certain area is rapidly increasing, which is very likely caused by the tilting of the workpiece. Therefore, the support blocks of the working supports with increased pressure are raised to support the tilted part of the workpiece, thereby providing stable support for the workpiece. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the workpiece positioning support fixture in an embodiment of the present invention;

[0046] Figure 2 This is a partial structural schematic diagram of the workpiece positioning and support fixture in an embodiment of the present invention;

[0047] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0048] Figure 4 yes Figure 2 Enlarged view of point B in the middle;

[0049] Figure 5 This is the first flowchart of the workpiece positioning support fixture control method in this embodiment of the invention;

[0050] Figure 6 This is the second flowchart of the workpiece positioning support fixture control method in this embodiment of the invention;

[0051] Figure 7 This is the third flowchart of the workpiece positioning support fixture control method in this embodiment of the invention.

[0052] In the picture:

[0053] 1. Base; 11. Slide groove; 12. Guide rail; 13. Receiving groove;

[0054] 2. Clamping mechanism; 21. Clamping plate; 211. Slide table; 212. Guide groove; 213. First buffer pad; 22. Lead screw; 23. Drive motor;

[0055] 3. Support mechanism; 31. Pallet; 311. Second buffer pad; 32. Linear drive mechanism;

[0056] 4. Support component; 41. Support block; 42. Third drive component;

[0057] 5. Controller; 51. First pressure sensor; 52. Second pressure sensor; 53. Third pressure sensor. Detailed Implementation

[0058] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0059] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction 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.

[0060] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0061] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0062] Example 1

[0063] Currently, traditional fixtures generally consist of two modules: clamping and support. The clamping module is used to clamp the workpiece, and the support module is used to provide support. However, there are some problems with them. On the one hand, the support module of the fixture has a fixed structure, and different fixtures need to be changed when processing workpieces of different specifications. On the other hand, during the cutting process, the center of gravity of the workpiece will change as the cutting progresses, which can easily lead to uneven force on the workpiece, resulting in deformation or displacement.

[0064] In response, this embodiment provides a workpiece positioning support fixture to adapt to workpieces of different specifications, while avoiding deformation of the workpiece due to uneven force. It can be used in the field of tooling and fixture technology.

[0065] Reference Figures 1-4The workpiece positioning support fixture includes a base 1, a clamping mechanism 2, a support mechanism 3, and multiple support members 4. The clamping mechanism 2 includes two clamping plates 21 slidably disposed on the base 1 along a first direction, and a first driving member for driving the two clamping plates 21 to move closer or further apart along the first direction. The first direction is... Figures 1-2 The CD direction is specified. When the two clamping plates 21 approach each other along the first direction, they can clamp the workpiece. The support mechanism 3 includes two support plates 31, which are movably connected to the two clamping plates 21 in a one-to-one correspondence and are used to support the lower surface of the workpiece. The support mechanism 3 also includes a second driving member for driving the two support plates 31 to move relative to the clamping plates 21. Multiple support members 4 are arranged in a rectangular array, specifically in a rectangular array along the first and second directions, wherein the second direction is the CD direction. Figures 1-2 The support member 4 includes a support block 41 that slides vertically on the base 1 and a third drive member 42 for driving the support block 41 to move. The support block 41 is used to support the lower surface of the workpiece. When placing the workpiece, the workpiece can be placed on multiple support members 4, and the multiple support members 4 arranged in a rectangular array can support the workpiece. Different combinations of support members 4 can support workpieces of different shapes or sizes to adapt to workpieces of different specifications. In addition, multiple parts of the workpiece can be supported at the same time to improve the uniformity of workpiece support. In this workpiece positioning support fixture, the first drive member can also drive two clamping plates 21 to move closer to each other in the first direction to clamp the workpiece and complete the positioning. At the same time, the two support plates 31 of the support mechanism 3 can support the parts of the workpiece close to the two clamping plates 21, and can support the edge parts or local areas of the irregular structure of the workpiece, thereby improving the stability of the support.

[0066] Continue to refer to Figures 1-4 The first driving component includes a lead screw 22 rotatable relative to the base 1 and a drive motor 23 for driving the lead screw 22 to rotate. The lead screw 22 includes a forward threaded section and a reverse threaded section arranged sequentially along a first direction. Two clamping plates 21 are threadedly connected to the forward threaded section and the reverse threaded section, respectively. Thus, the drive motor 23 can drive the lead screw 22 to rotate, thereby simultaneously driving the two clamping plates 21 to move, so that the two clamping plates 21 move closer to each other or further away from each other. Specifically, the clamping plates 21 are provided with a slide 211, which has an internal thread. The slides 211 of the two clamping plates 21 are threadedly connected to the forward threaded section and the reverse threaded section, respectively.

[0067] Continue to refer to Figures 1-4The base 1 is also provided with a slide groove 11 extending along the first direction. Both clamping plates 21 are slidably engaged with the slide groove 11. The lead screw 22 is disposed within the slide groove 11, thereby placing the lead screw 22 and a portion of the clamping plate 21 within the slide groove 11. This saves space occupied by the workpiece positioning support fixture and provides some protection for the lead screw 22. Optionally, the base 1 is also provided with a guide rail 12 extending along the first direction. The guide rail 12 is located within the slide groove 11. The clamping plate 21 has a guide groove 212, and the guide rail 12 slides through the guide groove 212, thereby guiding and limiting the movement of the clamping plate 21.

[0068] Optionally, a first buffer pad 213 is provided at the end of the clamping plate 21 near the workpiece, which can provide a certain buffer to prevent damage to the clamping plate 21 or the workpiece.

[0069] Continue to refer to Figures 1-4 The second driving component includes two linear drive mechanisms 32, two clamping plates 21, and two support plates 31, each corresponding to one another. The support plates 31 are rotatably mounted on the clamping plates 21. The linear drive mechanisms 32 are capable of reciprocating extension and retraction, with one end rotatably connected to the clamping plate 21 and the other end rotatably connected to the support plate 31. This allows adjustment of the position of the support plate 31 relative to the clamping plate 21, and thus the height of the support plate 31, by controlling the extension and retraction of the linear drive mechanisms 32. Optionally, the linear drive mechanism 32 can be an electric actuator; alternatively, it can also be a pneumatic cylinder or a hydraulic cylinder.

[0070] Optionally, the end of the pallet 31 away from the clamping plate 21 is arc-shaped, so that the end of the pallet 31 away from the clamping plate 21 can provide support for the workpiece during the rotation of the pallet 31 relative to the clamping plate 21.

[0071] Optionally, a second buffer pad 311 is provided at the end of the pallet 31 away from the clamping plate 21, which can provide a certain buffer to avoid damage to the workpiece.

[0072] Continue to refer to Figures 1-4 The base 1 is also provided with multiple receiving slots 13, and multiple support members 4 are correspondingly arranged with the multiple receiving slots 13. The support block 41 slides in conjunction with the receiving slot 13. The third driving member 42 is arranged in the receiving slot 13, thereby reducing the space occupied by the workpiece positioning support fixture, making the appearance neater, and at the same time preventing damage to the third driving member 42. In this embodiment, the third driving member 42 can specifically be an electric actuator, a cylinder, or a hydraulic cylinder.

[0073] Continue to refer to Figures 1-4 Multiple clamping mechanisms 2 and multiple support mechanisms 3 are provided, and multiple clamping mechanisms 2 and multiple support mechanisms 3 are arranged in a one-to-one correspondence, so that multiple clamping mechanisms 2 and multiple support mechanisms 3 can clamp and support the workpiece at different positions.

[0074] Continue to refer to Figures 1-4 The clamping plate 21 is equipped with a first pressure sensor 51, which is used to acquire the pressure on the clamping plate 21; the support plate 31 is equipped with a second pressure sensor 52, which is used to acquire the pressure on the support plate 31; and the support block 41 is equipped with a third pressure sensor 53, which is used to acquire the pressure on the support block 41. Optionally, the workpiece positioning support fixture also includes a controller 5. The first pressure sensor 51, the second pressure sensor 52, and the third pressure sensor 53 are all communicatively connected to the controller 5 and can send the detected data to the controller 5. In addition, the first drive component, the second drive component, and multiple third drive components 42 are all communicatively connected to the controller 5. The controller 5 can control the operation of the above-mentioned drive components to drive the corresponding structural movement.

[0075] Example 2

[0076] This embodiment is implemented using the workpiece positioning and support fixture described in Embodiment 1 above.

[0077] Reference Figure 5 The workpiece positioning and support fixture control method includes the following steps.

[0078] S100: Confirm that the workpiece has been placed on multiple support members 4.

[0079] Among them, the support component 4 used to support the workpiece is the working support component.

[0080] S110: Obtain the weight of the workpiece and the shape of the lower surface of the workpiece.

[0081] The weight of the workpiece and the shape of its lower surface can be obtained based on the pressure exerted on the support block 41 of the working support and the distribution of the working support. The pressure exerted on the support block 41 of the working support can be obtained by the third pressure sensor 53.

[0082] S120: Obtain the type of workpiece and the corresponding preset clamping force.

[0083] Specifically, the obtained weight of the workpiece and the shape of the lower surface of the workpiece can be compared with the parameters in the database to determine the type of workpiece.

[0084] S130: The workpiece is clamped by the clamping mechanism 2, and the clamping force of the two clamping plates 21 is the preset clamping force; and the extension length of the support block 41 of each working support is adjusted so that the pressure on the support block 41 of each working support is consistent.

[0085] In this step, the workpiece is clamped by the clamping mechanism 2, and the clamping force of the two clamping plates 21 is a preset clamping force. The clamping force is adjusted based on workpieces of different specifications to ensure that the clamping force applied by the two clamping plates 21 to the workpiece is appropriate. The clamping force of the two clamping plates 21 is numerically the same as the pressure exerted on the clamping plates 21, and therefore the clamping force of the two clamping plates 21 can be obtained by the first pressure sensor 51.

[0086] Optionally, each type of workpiece has a corresponding preset clamping force. For heavy workpieces with good rigidity (such as thick steel plates), the corresponding preset clamping force can be set to be larger, while the height of the support plate 31 can be reduced, so that the workpiece is mainly supported by the support member 4. For thin-walled workpieces that are easily deformed (such as profiles), the corresponding preset clamping force can be set to be smaller to avoid crushing, while the height of the support plate 31 can be increased so that the workpiece is supported by both the support member 4 and the support mechanism 3 to counteract the vibration stress during cutting.

[0087] In addition, by adjusting the extension length of the support block 41 of each working support, the pressure on the support block 41 of each working support is made consistent, so that multiple parts of the workpiece can be supported simultaneously by multiple working support members, thereby improving the uniformity of workpiece support.

[0088] S140: Begin cutting the workpiece.

[0089] During the cutting process, the center of gravity of the workpiece may change, which may cause the workpiece to tilt. To address this, the workpiece positioning and support fixture control method includes the following steps.

[0090] S150: Obtain the pressure on the support block 41 of each working support component.

[0091] S160: Determine whether there is an increase in pressure on the working support block 41 and the rate of increase is greater than the preset rate.

[0092] If yes, it indicates that the pressure on the support block 41 of a certain working support component or a certain area has increased rapidly, which is most likely caused by the tilting of the workpiece, so step S170 is executed. If no, return to step S150.

[0093] S170: Support block 41 for working support component with increased pressure.

[0094] Through the above steps, when the workpiece tilts, the support block 41 of the workpiece with increased pressure can be raised to support the tilted part of the workpiece, thereby providing stable support for the workpiece.

[0095] S180: Adjust the extension length of the support block 41 of each working support to make the pressure on the support block 41 of each working support consistent, and return to step S150.

[0096] After the tilted workpiece is resupported, the workpiece is restored to its initial state by adjusting the extension length of the support blocks 41 of each working support member to ensure that the pressure on each support block 41 is consistent, thereby simultaneously supporting multiple parts of the workpiece through multiple working support members. Then, the process returns to step S150, where the pressure on each support block 41 of each working support member is re-acquired, and it is further determined whether there is a situation where the pressure on the support block 41 of the working support member increases at a rate greater than a preset rate.

[0097] Reference Figure 6 The workpiece positioning support tooling control method also includes the following steps that are executed after step S140 and synchronously with step S150.

[0098] S200: Obtain the distance between each clamping mechanism 2 and the cutting position along the second direction; wherein the first direction is perpendicular to the second direction.

[0099] S210: Determine whether there is a distance between the clamping mechanism 2 and the cutting position along the second direction that is less than a preset distance.

[0100] The preset distance can be set in advance according to actual needs and stored in the controller 5.

[0101] If yes, proceed to step S220; otherwise, return to step S200.

[0102] S220: Reduce the clamping force of the two clamping plates 21 of the clamping mechanism 2 when the distance from the cutting position along the second direction is less than a preset distance.

[0103] Therefore, when the cutting position is close to the clamping position of the clamping mechanism 2, the clamping force of the two clamping plates 21 of the clamping mechanism 2 is appropriately reduced, thereby avoiding excessive local stress on the workpiece.

[0104] Optionally, after completing step S220, return to step S200.

[0105] Reference Figure 7 The workpiece positioning support tooling control method also includes the following steps that are executed after step S140 and synchronously with step S150.

[0106] S300: Simultaneously obtain the clamping force of the two clamping plates 21 of each clamping mechanism 2, the pressure on the support plate 31 of each support mechanism 3, and the pressure on the support block 41 of each working support component.

[0107] S310: Determine whether the clamping force of the two clamping plates of the clamping mechanism is greater than the first preset pressure, determine whether the pressure on the support plate of the support mechanism is greater than the second preset pressure, and determine whether the pressure on the support block of the working support component is greater than the third preset pressure.

[0108] If the clamping force of the two clamping plates of the clamping mechanism is greater than the first preset pressure, or the pressure on the support plate of the support mechanism is greater than the second preset pressure, or the pressure on the support block of the working support is greater than the third preset pressure, then step S320 is executed.

[0109] S320: Suspend cutting operations.

[0110] By following the steps described above, the cutting operation can be paused when the reading of any pressure sensor exceeds its corresponding value, thus providing overload protection.

[0111] Optionally, the workpiece positioning support tooling control method further includes step S330, which is executed after step S140 and synchronously with step S150.

[0112] S330: Determine if there is a pressure sensor malfunction or mechanical jamming, and proceed to step S320.

[0113] Specifically, pressure sensor malfunctions can be determined under the following conditions: In a static state, if the readings of the same sensor fluctuate more than a threshold (e.g., ±20%) multiple times consecutively, or if the readings of the same type of sensor at different locations (e.g., adjacent third pressure sensor 53) differ too much (e.g., the difference between the two exceeds 30%), then the sensor is considered faulty. During dynamic adjustment, if the sensor readings do not match the actuator's movements (e.g., when the linear drive mechanism 32 extends, the reading of the second pressure sensor 52 does not change), then the sensor is also considered faulty.

[0114] Mechanical jamming can be determined by the following conditions: If, after the controller 5 issues an action command, the corresponding position sensor does not provide feedback within a certain time (e.g., within 1 second) or the feedback value deviates from the command by more than a preset value (e.g., 5 mm), it is determined to be mechanical jamming. Alternatively, if the elongation / contraction of the third drive component 42 does not match the pressure change (e.g., the pressure rises suddenly but the extension / contraction of the third drive component 42 is 0), it is determined to be oil circuit blockage or mechanical jamming.

[0115] In addition, human judgment is also possible. Specifically, when the operator discovers a visually visible abnormality (such as obvious workpiece deformation or abnormal noise from the mechanism), he / she can press the emergency control button. When the controller 5 detects that the emergency control button has been pressed, it also determines that there is a pressure sensor malfunction or mechanical jamming.

[0116] In this embodiment, steps S150, S200, S300 and S330 are executed simultaneously.

[0117] Optionally, after the workpiece is cut, the execution of the workpiece positioning support fixture control method is terminated.

[0118] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A workpiece positioning and support fixture control method, characterized in that, This is achieved through workpiece positioning and support fixtures. The workpiece positioning support fixture includes: Base (1); The clamping mechanism (2) includes two clamping plates (21) slidably disposed on the base (1) along a first direction and a first driving member for driving the two clamping plates (21) to move closer to each other or further away from each other along the first direction. When the two clamping plates (21) move closer to each other along the first direction, they can clamp the workpiece. The support mechanism (3) includes two pallets (31), which are movably connected to the two clamping plates (21) in a one-to-one correspondence and are used to support the lower surface of the workpiece. The support mechanism (3) also includes a second driving member for driving the two pallets (31) to move relative to the clamping plates (21). Multiple support members (4) are arranged in a rectangular array. Each support member (4) includes a support block (41) that is slidably disposed on the base (1) in the vertical direction and a third drive member (42) for driving the support block (41) to move. The support block (41) is used to support the lower surface of the workpiece. The second driving component includes two linear driving mechanisms (32), two clamping plates (21), two linear driving mechanisms (32) and two trays (31) are arranged in a one-to-one correspondence. The trays (31) are rotatably mounted on the clamping plates (21). The linear driving mechanisms (32) can reciprocate and extend. One end of the linear driving mechanism (32) is rotatably connected to the clamping plates (21) and the other end is rotatably connected to the trays (31). The workpiece positioning and support fixture control method includes: S100: Determine that the workpiece has been placed on the plurality of supports (4); wherein the supports (4) used to support the workpiece are working supports; S110: Obtain the weight of the workpiece and the shape of the lower surface of the workpiece; S120: Obtain the type of the workpiece and the corresponding preset clamping force; S130: The workpiece is clamped by the clamping mechanism (2), and the clamping force of the two clamping plates (21) is the preset clamping force; and the extension length of the support block (41) of each working support is adjusted so that the pressure on the support block (41) of each working support is consistent. S140: Begin cutting the workpiece; S150: Obtain the pressure on the support block (41) of each of the working supports; S160: Determine whether there is an increase in pressure on the support block (41) of the working support and the rate of increase is greater than a preset rate; If so, proceed to step S170; S170: The support block (41) of the working support increases with the increase of pressure. The workpiece positioning support fixture control method also includes the following steps after step S170: S180: Adjust the extension length of the support block (41) of each of the working supports so that the pressure on the support block (41) of each of the working supports is consistent, and return to step S150.

2. The workpiece positioning support fixture control method according to claim 1, characterized in that, In the workpiece positioning support fixture, the first driving component includes a lead screw (22) that can rotate relative to the base (1) and a drive motor (23) for driving the lead screw (22) to rotate. The lead screw (22) includes a forward thread section and a reverse thread section arranged sequentially along a first direction. The two clamping plates (21) are threadedly connected to the forward thread section and the reverse thread section, respectively.

3. The workpiece positioning and support fixture control method according to claim 2, characterized in that, In the workpiece positioning support fixture, the base (1) is also provided with a sliding groove (11) extending along the first direction, and the two clamping plates (21) are slidably engaged with the sliding groove (11), and the lead screw (22) is disposed in the sliding groove (11).

4. The workpiece positioning and support fixture control method according to claim 1, characterized in that, In the workpiece positioning support fixture, the base (1) is also provided with multiple receiving grooves (13), multiple supporting members (4) are provided in correspondence with multiple receiving grooves (13), the support block (41) slides with the receiving groove (13), and the third driving member (42) is provided in the receiving groove (13).

5. The workpiece positioning and support fixture control method according to claim 1, characterized in that, Multiple clamping mechanisms (2) and multiple supporting mechanisms (3) are provided, and multiple clamping mechanisms (2) and multiple supporting mechanisms (3) are provided in a one-to-one correspondence; The workpiece positioning support fixture control method also includes a step that starts executing synchronously with step S150 after step S140: S200: Obtain the distance between each of the clamping mechanisms (2) and the cutting position along the second direction; wherein the first direction is perpendicular to the second direction; S210: Determine whether the distance between the clamping mechanism (2) and the cutting position along the second direction is less than a preset distance; If so, proceed to step S220; S220: Reduce the clamping force of the two clamping plates (21) of the clamping mechanism (2) when the distance from the cutting position along the second direction is less than a preset distance.

6. The workpiece positioning and support fixture control method according to claim 1, characterized in that, Multiple clamping mechanisms (2) and multiple supporting mechanisms (3) are provided, and multiple clamping mechanisms (2) and multiple supporting mechanisms (3) are provided in a one-to-one correspondence; The workpiece positioning support fixture control method also includes a step that starts executing synchronously with step S150 after step S140: S300: Simultaneously obtain the clamping force of the two clamping plates (21) of each clamping mechanism (2), the pressure on the support plate (31) of each support mechanism (3), and the pressure on the support block (41) of each working support member; S310: Determine whether the clamping force of the two clamping plates of the clamping mechanism is greater than the first preset pressure, determine whether the pressure on the support plate of the support mechanism is greater than the second preset pressure, and determine whether the pressure on the support block of the working support component is greater than the third preset pressure. If the clamping force of the two clamping plates of the clamping mechanism is greater than the first preset pressure, or if the pressure on the support plate of the support mechanism is greater than the second preset pressure, or if the pressure on the support block of the working support is greater than the third preset pressure, then step S320 is executed. S320: Suspend cutting operations.

7. The workpiece positioning support fixture control method according to claim 6, characterized in that, The clamping plate (21) is provided with a first pressure sensor (51), which is used to obtain the pressure on the clamping plate (21); the tray (31) is provided with a second pressure sensor (52), which is used to obtain the pressure on the tray (31); the support block (41) is provided with a third pressure sensor (53), which is used to obtain the pressure on the support block (41). The workpiece positioning support fixture control method also includes a step that starts executing synchronously with step S150 after step S140: S330: Determine if there is a pressure sensor malfunction or mechanical jamming, and proceed to step S320.

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