Plate numerical control cutting system and method based on tail end pre-pressing

Abstract

The invention discloses a plate numerical control cutting system and method based on tail end pre-pressing, and relates to the technical field of numerical control machining. In order to solve the problems that in the prior art, the pressing time lacks quantitative basis, interference is prone to occurring or the pressing effect is poor, the core of the method is that a trigger point of a pressing piece is quantized to be 5%-20% of the total length of a remaining path. The system comprises a graphical design module, a path and time sequence control module and a numerical control cutting execution mechanism. The method comprises the steps that a closed-loop path is planned, the total length is calculated, the remaining path is monitored in real time in the cutting process, and when a threshold value is reached, a pressing piece is triggered for pressing till cutting is completed. The scheme can adapt to different contours, balance the pressing effect and the system efficiency, the threshold value can be finely adjusted according to the plate characteristics or the technology, operation is simplified, and the cutting precision and the notch quality are improved.

Description

Technical Field

[0001] This invention belongs to the field of CNC machining technology, specifically relating to a CNC cutting system and method for sheet metal based on end pre-compression. Background Technology

[0002] In the field of CNC machining technology, during the CNC cutting of sheet metal, in order to prevent the workpiece from shifting or warping due to factors such as cutting force and initial stress, and to ensure cutting accuracy and cut quality, the sheet metal needs to be clamped and fixed. Currently, the industry generally adopts two mainstream methods: full-process clamping or pre-clamping before cutting, which are the core means to prevent workpiece displacement in existing technologies.

[0003] The full-process clamping method has obvious limitations. Its clamping mechanism needs to follow the cutting path for a long time, which not only makes it easy to interfere with the tool path, but also puts extremely high demands on the follow-up and flexibility of the clamping mechanism, increasing the design and operation costs of the equipment. On the other hand, the pre-clamping method before cutting gradually loses its ideal clamping effect in the middle and later stages of cutting due to the release of the initial stress of the plate, making it difficult to continuously guarantee the fixing effect.

[0004] The key drawback of existing technology is the lack of a precise and quantitative clamping trigger control scheme. Especially at the stage when the cutting is about to be completed and the connection between the workpiece and the base material is weakest, it is impossible to specifically strengthen the clamping effect, which makes the workpiece prone to warping or displacement, directly affecting the accuracy of the final cutting segment and the quality of the cut. It is difficult to achieve a balance between clamping effect, interference risk and system efficiency. Summary of the Invention

[0005] The present invention aims to solve the problems of interference risk and reduced clamping effect in the existing CNC cutting technology, which uses full-process clamping or pre-clamping before cutting. Furthermore, it lacks a control scheme that accurately quantifies and triggers clamping based on the remaining path length, making it difficult to balance the clamping effect, interference risk, and system efficiency.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A CNC cutting system for sheet metal based on end pre-compression, adapted to CNC cutting equipment, the CNC cutting equipment including a frame, a three-axis linear module, and cutting execution components, including:

[0008] CNC cutting actuator, which reuses the cutting execution components of CNC cutting equipment, including cutting tools and pressing parts;

[0009] The graphical design module provides a graphical user interface, allowing users to define the closed outline pattern to be cut, the cutting start point, and receive input of sheet material parameters and cutting process parameters.

[0010] The path and timing control module is connected to the three-axis linear module and the cutting execution component. It is used to plan the closed-loop path of the cutting tool, calculate the total path length, and generate the collaborative control timing of the pressing part based on the percentage threshold of the remaining path length.

[0011] The system is configured such that the cutting tool starts from the starting point and returns to the starting point along a closed-loop path. When the remaining path length reaches a preset threshold of the total path length, the path and timing control module triggers the pressing component to press down, and the pressing state is maintained until the cutting is completed.

[0012] This system effectively avoids workpiece displacement at the cutting end through a precise triggering mechanism with end pre-compression, balancing the compressing effect, interference risk, and system efficiency, and ensuring cutting accuracy and cut quality.

[0013] As a preferred option, the preset remaining path length percentage threshold of the path and timing control module is 5% to 20%. The threshold can be fine-tuned according to the material, thickness or cutting process of the board, or the specific value can be manually input through the graphical design module. The threshold supports process adaptation fine-tuning and manual input, flexibly meeting the personalized needs of different boards and cutting processes, and improving process adaptability and ease of operation.

[0014] Preferably, the three-axis linear module includes a horizontal linear motor module, a vertical linear motor module, and a longitudinal linear motor module mounted on the frame. The longitudinal linear motor module is mounted on the horizontal moving base of the horizontal linear motor module, and the longitudinal linear motor module is mounted on the vertical moving base of the longitudinal linear motor module. The path and timing control module controls the three-axis linear module to achieve precise execution of the cutting path. The hierarchical layout and precise control of the three-axis linear module ensure high precision and stability of the cutting path execution, providing a reliable guarantee for cutting quality.

[0015] Preferably, the cutting execution component includes a lifting plate fixed on the vertical moving seat of the vertical linear motor module, a cutting unit, and a pressing and fixing unit. Both the cutting unit and the pressing and fixing unit are fixed on the lifting plate, and the cutting unit and the pressing and fixing unit are integrated into the lifting plate, which simplifies the structural layout, realizes the coordinated linkage of cutting and pressing actions, and improves the coordination of equipment operation.

[0016] Preferably, the pressing and fixing unit includes a transverse rodless cylinder mounted on the lifting plate, a longitudinal rodless cylinder fixedly connected to a movable slide on the transverse rodless cylinder, and a pressing cylinder fixed on the movable slide of the longitudinal rodless cylinder. The pressing component is fixed to the piston rod end of the pressing cylinder. The pressing cylinder receives instructions from the path and timing control module, drives the pressing component to move towards the worktable of the frame and presses the plate. Multiple cylinders work together to drive the pressing component, which can quickly adjust the position and stably press the plate, ensuring timely and reliable end pressing and avoiding workpiece displacement.

[0017] The cutting unit includes a cutting cylinder fixed on the lifting plate. The output end of the cutting cylinder is connected to the cutting tool to drive the cutting tool to rotate at high speed. The cutting cylinder drives the cutting tool to rotate at high speed, ensuring efficient execution of the cutting action and improving the cutting efficiency and cut flatness of the plate.

[0018] A CNC cutting method for sheet metal based on end pre-compression, applied to the aforementioned CNC cutting system for sheet metal based on end pre-compression, includes the following steps:

[0019] S1: Define the closed contour and cutting start point through the graphical design module, input the sheet material and cutting process parameters, and the path and timing control module plans the closed loop path and calculates the total path length.

[0020] S2: Drive the cutting tool to cut along the closed-loop path starting from the starting point;

[0021] S3: The path and timing control module calculates the remaining path length in real time. When the preset threshold is reached, it triggers the pressing and fixing unit to drive the pressing component to press the plate.

[0022] S4: The cutting tool continues to complete the remaining path cutting and returns to the starting point, while the pressure piece remains in a clamped state;

[0023] S5: After cutting is completed, the lower pressure piece rises and resets.

[0024] This method has a clear process and closely linked steps, achieving standardized control of the entire process from path planning to cutting completion. It is easy to operate and can reliably ensure cutting quality.

[0025] As a preferred option, in step S3, the preset threshold is 5% to 20% of the total path length. Specifically, a threshold of 15%-20% is used for easily deformable plates, and a threshold of 5%-10% is used for rigid plates. The threshold is set differently according to the characteristics of the plates, so that the end clamping is more targeted and further improves the cutting accuracy and stability of different types of plates.

[0026] Preferably, in step S2, the servo motors of the three-axis linear module control the horizontal linear motor module, the vertical linear motor module, and the longitudinal linear motor module to work together, driving the cutting execution component to move along a preset trajectory and driving the lifting plate to descend so that the cutting tool contacts the plate. The coordinated control of the three-axis linear module servo motors enables the precise trajectory movement of the cutting execution component and the precise cutting of the tool, ensuring the accuracy of the cutting path and depth.

[0027] Compared with the prior art, the technical effects and advantages of the present invention are:

[0028] (1) The present invention achieves precision and wide adaptability of clamping control. Through the innovative quantitative triggering mechanism, it can achieve stable clamping at the critical stage at the end of the cutting without setting clamping parameters separately for different sizes and shapes of cutting contours. This effectively solves the problem that the clamping timing in the prior art lacks a unified standard and is difficult to adapt to diverse cutting needs.

[0029] (2) The present invention achieves the optimal balance between clamping effect and system efficiency, avoids the risk of mechanism interference that may be caused by full-process clamping, and overcomes the defect of the clamping effect of pre-clamping before cutting decreasing in the middle and later stages. Clamping is started only at the end stage where the workpiece is most likely to be displaced, which not only ensures the cutting accuracy and cut quality, but also reduces the ineffective action of the clamping mechanism and improves the overall reliability of the system.

[0030] (3) The present invention has flexible process adaptability and simplifies the operation process. The pressing triggering conditions can be flexibly adjusted according to the characteristics of the board and the cutting process to meet the fine processing needs in different scenarios. At the same time, the system automatically calculates the triggering time, eliminating the need for users to manually set complex parameters, which greatly reduces the operation threshold and simplifies the production preparation process. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the CNC cutting equipment of the present invention;

[0032] Figure 2 This is a schematic diagram of the cutting unit and the pressing and fixing unit of the present invention;

[0033] Figure 3 This is a structural schematic diagram of the cutting pattern, starting point, and pressing point position of the present invention;

[0034] Figure 4 This is a system block diagram of the present invention.

[0035] In the diagram: 1. Frame; 2. Sheet metal; 3. Worktable; 4. Lifting plate; 5. Horizontal linear motor module; 6. Vertical linear motor module; 7. Vertical linear motor module; 9. Cutting unit; 91. Cutting cylinder; 92. Cutting tool; 10. Pressing and fixing unit; 101. Horizontal rodless cylinder; 102. Vertical rodless cylinder; 103. Pressing cylinder; 104. Pressing component. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] The following combination Figures 1 to 4 This application will be described in further detail.

[0038] This application discloses a CNC cutting system and method for sheet metal based on end pre-clamping. Addressing the problem in existing technologies that lack quantitative basis for clamping timing and cannot adapt to different cutting contours, this application provides an innovative end pre-clamping control scheme based on a percentage trigger of the remaining path length. The core of this scheme lies in quantifying the trigger point of the pressing action of the pressing member 104 as a specific percentage position of the total remaining path length from the cutting start point, thereby achieving unified and optimal end-clamping control for cutting contours of different shapes and sizes.

[0039] A CNC cutting system for sheet metal based on end pre-compression is adapted to CNC cutting equipment. The CNC cutting equipment includes a frame 1, a three-axis linear module, and a cutting execution component. The CNC cutting system for sheet metal based on end pre-compression specifically includes a CNC cutting execution mechanism, a graphical design module, and a path and timing control module.

[0040] The CNC cutting actuator reuses the cutting execution component of the CNC cutting equipment, mainly consisting of the cutting tool 92 and the pressing component 104. It is the core execution component for realizing the cutting of the plate 2 and the end clamping action.

[0041] The graphical design module provides an intuitive graphical user interface, allowing users to define at least one closed-out pattern to be cut within the virtual material 2 area and specify the cutting start point. Simultaneously, this module can receive user-input material 2 parameters and cutting process parameters, providing fundamental data support for subsequent path planning and timing control. Material 2 parameters include material and thickness, while cutting process parameters include cutting speed and processing depth.

[0042] The path and timing control module establishes signal connections with the three-axis linear module and the cutting execution component. Its core functions include:

[0043] Path planning: Based on the closed contour and cutting start point defined by the graphical design module, the closed-loop path of the cutting tool 92 is planned, starting from the start point, running along the closed contour and finally returning to the start point;

[0044] Length calculation: Accurately calculate the total length L_total of the closed-loop path;

[0045] Timing generation: Based on a preset threshold for the percentage of remaining path length, the collaborative control timing of the pressing component 104 is generated to ensure precise coordination between the pressing action and the cutting process.

[0046] System core configuration parameters and structural details

[0047] Threshold setting: The preset remaining path length percentage threshold of the path and timing control module is 5% to 20%. This threshold can be fine-tuned according to the material, thickness or cutting process of the board 2, or the specific value can be manually input through the graphical design module, such as directly inputting 20mm, and the cutting process is such as laser cutting, water jet cutting, etc.

[0048] The three-axis linear module structure includes a transverse linear motor module 5, a longitudinal linear motor module 6, and a vertical linear motor module 7 mounted on the frame 1. The longitudinal linear motor module 6 is mounted on the transverse moving base of the transverse linear motor module 5, and the vertical linear motor module 7 is mounted on the longitudinal moving base of the longitudinal linear motor module 6. The path and timing control module controls the coordinated movement of the three-axis linear modules to achieve precise execution of the cutting path.

[0049] The cutting execution component structure includes a lifting plate 4, a cutting unit 9, and a pressing and fixing unit 10, which are fixed on the vertical moving seat of the vertical linear motor module 7. Both the cutting unit 9 and the pressing and fixing unit 10 are fixed on the lifting plate 4.

[0050] The cutting unit 9 is composed of a cutting cylinder 91 fixed on the lifting plate 4. The output end of the cutting cylinder 91 is connected to the cutting tool 92, which can drive the cutting tool 92 to rotate at high speed to complete the cutting action.

[0051] The pressing and fixing unit 10 includes a transverse rodless cylinder 101 mounted on the lifting plate 4, a longitudinal rodless cylinder 102 fixedly connected to a movable slide on the transverse rodless cylinder 101, and a pressing cylinder 103 fixed on the movable slide of the longitudinal rodless cylinder 102. A pressing component 104 is fixed to the piston rod end of the pressing cylinder 103. The pressing cylinder 103 receives instructions from the path and timing control module and can drive the pressing component 104 to move towards the worktable surface 3 of the frame 1 and press the plate 2.

[0052] like Figure 3 As shown, the working logic of this CNC cutting system for sheet metal based on end pre-compression is as follows:

[0053] For each closed pattern to be cut, the system operates according to the following process:

[0054] a) The cutting tool 92 starts from the starting point along the planned closed-loop path and runs along the closed contour;

[0055] b) The path and timing control module tracks the current position of the cutting tool 92 in real time and calculates the remaining path length L_remaining from the current position to the starting point;

[0056] c) When the remaining path length L_remaining reaches the preset threshold of the total path length L_total, the pressing component 104 is triggered to perform a pressing action;

[0057] d) After the pressing part 104 is pressed down, it remains in a pressed state until the cutting tool 92 returns to the starting point and completes the cutting of the pattern;

[0058] e) After the cutting is completed, the lower pressure piece 104 is raised and reset.

[0059] A CNC cutting method for sheet metal based on end pre-compression, applied to the aforementioned CNC cutting system for sheet metal based on end pre-compression, specifically includes the following steps:

[0060] Step S1: Path planning and parameter input. Define the closed contour to be cut and the cutting start point through the graphical design module, and input the plate parameters (material, thickness, etc.) and cutting process parameters (cutting speed, processing depth, etc.). The path and timing control module plans the closed-loop path of the cutting tool 92 according to the received information and accurately calculates the total length L_total of the closed-loop path.

[0061] Step S2: The servo motor control of the three-axis linear module to start cutting coordinates the horizontal linear motor module 5, the vertical linear motor module 6 and the vertical linear motor module 7 to drive the cutting execution component to move along the preset trajectory and drive the lifting plate 4 to descend so that the cutting tool 92 contacts the plate 2; then, the cutting tool 92 performs the cutting action from the starting point along the closed loop path.

[0062] Step S3: The end-point clamping trigger path and timing control module calculates the remaining path length L_remaining from the current position of the cutting tool 92 to the starting point in real time. When the remaining path length reaches a preset threshold, the pressing and fixing unit 10 is triggered: the horizontal rodless cylinder 101 and the vertical rodless cylinder 102 work together to adjust the horizontal position of the pressing component 104, so that the pressing component 104 moves to a predetermined position inside the closed contour. Then, the pressing cylinder 103 drives the pressing component 104 to move towards the worktable 3, pressing the plate 2. The preset threshold is 5% to 20% of the total path length, and can be flexibly selected according to the characteristics of the plate 2: 15%-20% threshold is used for easily deformable plate 2, and 5%-10% threshold is used for rigid plate 2. At the same time, the threshold can also be manually input through the graphical design module.

[0063] Step S4: Final Cutting and Clamping: The cutting tool 92 continues to run along the closed-loop path to complete the cutting of the remaining path and return to the starting point. During this process, the pressure member 104 always remains in a clamping state to prevent the workpiece from warping or shifting at the weakest end of the cutting stage.

[0064] Step S5: After the cutting tool 92 returns to the starting point and completes the cutting of the closed contour, the lower pressure piece 104 is raised and reset, and the single cutting process ends.

[0065] Specific implementation scenarios of the present invention are shown below:

[0066] Taking the cutting of a rigid plate 2 with a large, complex, closed contour as an example, the implementation process of the present invention will be described in detail:

[0067] Threshold setting: Since plate 2 is a rigid material, the threshold K=10% of the remaining path percentage triggered by the downward pressure is set through the graphical design module.

[0068] Path planning and calculation: The graphical design module defines the closed contour and cutting start point, and the path and timing control module plans the tool path and calculates the total length of the closed loop path L_total=1000mm.

[0069] Cutting stage: The cutting tool 92 starts cutting normally from the starting point, and the pressing part 104 is in the raised state; the path and timing control module tracks the tool position in real time and calculates the remaining path length L_remaining.

[0070] Trigger judgment: When the cutting tool 92 runs to the remaining path length L_remaining=1000mm×10%=100mm, the system determines that the tool has entered the "end cutting stage" and triggers the downward action.

[0071] During the pressing stage: the path and timing control module issues a command, and the horizontal rodless cylinder 101 and the vertical rodless cylinder 102 work together to adjust the position of the pressing component 104 to the predetermined area inside the contour. The pressing cylinder 103 drives the pressing component 104 to press down and press the plate 2.

[0072] Final Cutting and Holding: The cutting tool 92 continues to cut the last 100mm of the path until it returns to the starting point; during this stage, the pressure piece 104 remains in a pressed state to prevent the workpiece from shifting.

[0073] Release phase: After confirming that the cutting tool 92 has returned to the starting point and completed the cutting, the pressure piece 104 rises and resets.

[0074] For a small circular profile easily deformable sheet material 2, assuming its closed-loop path total length L_total=200mm, and a threshold K=18% (which falls within the 15%-20% range applicable to easily deformable sheet material 2), when the remaining path length L_remaining=200mm×18%=36mm, the system triggers the pressing component 104 to press the sheet material 2, which can also achieve precise end-point pressing control, demonstrating the adaptive capability of this invention to different sizes and shapes.

[0075] This invention quantifies the triggering condition as a percentage of the remaining path length (5%-20%), or allows for manual setting of specific values, enabling the solution to automatically adapt to closed contours of different sizes and shapes. Regardless of the contour size or shape, the system can achieve compression at the same "relative stage" at its cutting end, ensuring the consistency and universality of the control strategy.

[0076] In this invention, the trigger range of 5%-20% has been optimized, which can provide effective clamping in the final cutting stage when the workpiece connection is most vulnerable and most prone to displacement, while minimizing the action time of the clamping mechanism and the potential interference window with the tool, thereby improving the overall efficiency and reliability of the system.

[0077] In this invention, the percentage threshold can be used as an adjustable parameter. Users or the system can fine-tune it according to different board materials, thicknesses or cutting processes, or manually input specific values ​​to achieve refined and flexible process control.

[0078] With this invention, users do not need to manually specify complex clamping trigger points for each different profile. The system automatically calculates the triggering timing through a unified algorithm, which greatly simplifies the production preparation process and lowers the operating threshold.

[0079] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A CNC cutting system for sheet metal based on end pre-compression, adapted to CNC cutting equipment, the CNC cutting equipment including a frame (1), a three-axis linear module, and a cutting execution component, characterized in that, include: A CNC cutting actuator, which reuses the cutting execution components of a CNC cutting equipment, including a cutting tool (92) and a pressing component (104). The graphical design module is used to provide a graphical user interface, define the closed outline pattern to be cut and the cutting start point, and receive the plate (2) parameters and cutting process parameters input; The path and timing control module is connected to the three-axis linear module and the cutting execution component. It is used to plan the closed-loop path of the cutting tool (92), calculate the total path length, and generate the collaborative control timing of the pressing part (104) based on the percentage threshold of the remaining path length. The system is configured such that the cutting tool (92) starts from the starting point and returns to the starting point along the closed-loop path. When the remaining path length reaches the preset threshold of the total path length, the path and timing control module triggers the pressing component (104) to press down, and the pressing state is maintained until the cutting is completed.

2. The CNC cutting system for sheet metal based on end pre-compression according to claim 1, characterized in that: The preset remaining path length percentage threshold of the path and timing control module is 5% to 20%. The threshold can be finely adjusted according to the material, thickness or cutting process of the board (2), or the specific value can be manually input through the graphical design module.

3. The CNC cutting system for sheet metal based on end pre-compression according to claim 1, characterized in that: The three-axis linear module includes a horizontal linear motor module (5), a vertical linear motor module (6), and a vertical linear motor module (7) mounted on a frame (1). The vertical linear motor module (6) is mounted on the horizontal moving seat of the horizontal linear motor module (5), and the vertical linear motor module (7) is mounted on the vertical moving seat of the vertical linear motor module (6). The path and timing control module controls the three-axis linear module to achieve precise execution of the cutting path.

4. The CNC cutting system for sheet metal based on end pre-compression according to claim 3, characterized in that: The cutting execution assembly includes a lifting plate (4) fixed on the vertical moving seat of the vertical linear motor module (7), a cutting unit (9) and a pressing and fixing unit (10), both of which are fixed on the lifting plate (4).

5. A CNC cutting system for sheet metal based on end pre-compression according to claim 4, characterized in that: The pressing and fixing unit (10) includes a transverse rodless cylinder (101) mounted on the lifting plate (4), a longitudinal rodless cylinder (102) fixedly connected to the movable slide on the transverse rodless cylinder (101), and a pressing cylinder (103) fixed on the movable slide of the longitudinal rodless cylinder (102). The pressing component (104) is fixed to the piston rod end of the pressing cylinder (103). The pressing cylinder (103) receives instructions from the path and timing control module and drives the pressing component (104) to move towards the worktable (3) of the frame (1) and press the plate (2).

6. The CNC cutting system for sheet metal based on end pre-compression according to claim 4, characterized in that: The cutting unit (9) includes a cutting cylinder (91) fixed on the lifting plate (4). The output end of the cutting cylinder (91) is connected to the cutting tool (92) to drive the cutting tool (92) to rotate at high speed.

7. A CNC cutting method for sheet metal based on end pre-compression, applied to the CNC cutting system for sheet metal based on end pre-compression as described in any one of claims 1-7, characterized in that, Includes the following steps: S1: Define the closed contour and cutting start point through the graphical design module, input the plate (2) and cutting process parameters, and the path and timing control module plans the closed loop path and calculates the total path length; S2: Drive the cutting tool (92) to cut along the closed-loop path from the starting point; S3: The path and timing control module calculates the remaining path length in real time. When the preset threshold is reached, it triggers the pressing and fixing unit (10) to drive the pressing part (104) to press the plate (2). S4: The cutting tool (92) continues to complete the remaining path cutting and returns to the starting point, while the pressure piece (104) remains in a clamped state; S5: After the cutting is completed, the lower pressure piece (104) rises and resets.

8. A CNC cutting method for sheet metal based on end pre-compression according to claim 7, characterized in that: In step S3, the preset threshold is 5% to 20% of the total path length. For the easily deformable plate (2), the threshold is 15%-20%, and for the rigid plate (2), the threshold is 5%-10%.

9. A CNC cutting method for sheet metal based on end pre-compression according to claim 7, characterized in that: In step S2, the servo motors of the three-axis linear module control the horizontal linear motor module (5), the vertical linear motor module (6), and the vertical linear motor module (7) to work together to drive the cutting execution component to move along the preset trajectory and drive the lifting plate (4) to descend so that the cutting tool (92) contacts the plate (2).

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