Intelligent processing speed control method

Abstract

The invention discloses an intelligent processing speed control method and belongs to the technical field of cutting tool cutting. According to the technical scheme, slow sawing speed reduction is executed, wherein fixed speed reduction is conducted at the set fixed position length; and intelligent speed reduction is executed, specifically, speed reduction is conducted by referring to the threshold value or presetting the fixed position and speed in real time in the machining process. The method has the beneficial effects that the current value is collected and analyzed in real time, the feeding speed is dynamically adjusted according to the change of the current value, and intelligent control over the machining process is achieved; the processing problem caused by large hardness difference of wood in the traditional process is solved, and it is ensured that the optimal processing effect can be achieved on the wood with different hardness; production efficiency and product quality are effectively improved, and the service life of the cutting tool is prolonged; the system can be easily integrated with other automatic equipment and control systems, the flexibility and expandability of the system are improved, real-time monitoring and fault early warning can be achieved, machining errors caused by human factors or equipment performance fluctuation are reduced, and the overall quality and consistency of products are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of blade cutting, and relates to intelligent control of cutting feed speed of blades for cutting metal, plastic, wood, etc., and in particular to an intelligent control method for controlling cutting feed speed by collecting current value of blade motor, comparing with preset value, and calculating theoretical current threshold. Background Art

[0002] Because wood has natural defects, such as knots, oblique textures, cracks, warping and other defects caused by growth stress or natural damage; biological defects mainly include decay, discoloration and insect bites. Due to its natural characteristics, the hardness of the wood is different. When the wood is hard, the feed speed is too fast, which is easy to cause defective products and premature wear of the cutting tool; when the wood is soft, the feed speed is too slow and cannot meet the production efficiency. Therefore, under the same feed processing speed, the production quality and production efficiency cannot be met.

[0003] The traditional process manually presets the "deceleration current value" and "shutdown current value", but due to the large differences in wood properties, the cutting current fluctuates greatly. The fixed set values ​​cannot correctly reflect the processing status of each piece of wood in actual production, and the feed speed cannot be matched with the hardness of the wood.

[0004] During the reciprocating cutting process, a fixed and relatively fast feed speed is always maintained for cutting processing. Because the cutting tool frequently switches between cutting and no-load conditions, the cutting tool has no buffer speed and is prone to premature wear, which reduces production quality and production efficiency.

[0005] In summary, the prior art has technical problems such as processing difficulties caused by natural defects of wood, inadaptability of fixed parameter settings, and blade wear during reciprocating cutting. Summary of the invention

[0006] In order to solve the problems existing in the above-mentioned prior art, the present invention provides an intelligent control method for processing speed, which can realize dynamic matching of feed speed and wood hardness, improve the intelligence and automation level of the processing process, extend the service life of cutting tools, and improve overall production efficiency and product quality.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A processing speed intelligent control method, the steps are as follows:

[0009] Step 1: Execute slow-feed saw deceleration: perform fixed deceleration at the set fixed position length;

[0010] Step 2: Execute intelligent deceleration: decelerate in real time according to the threshold value or preset fixed position and speed during the processing.

[0011] Further, the steps are as follows:

[0012] S1, set the deceleration current base I1, stop current base I2; set the raw material thickness T, cutting thickness T1, reserved tail plate thickness T2, and calculate the number of cutting times n by the following formula:

[0013] n = (T – T2) / T1;

[0014] S2, cutting the plate once, peeling and leveling;

[0015] S3, cutting the plate again, when the feed servo reaches the starting position of current collection, current collection I1 is performed;

[0016] S4. Determine the real-time current value I:

[0017] (1) When I>I4, the alarm stops and the process goes to step S1 to restart the processing;

[0018] (2) When I<I3, high-speed feeding is performed;

[0019] (3) When I>I3, low-speed feeding is performed.

[0020] Furthermore, after high-speed feeding is performed, when the feed servo reaches the end position of current collection, the current I2 is collected. After the current cutting is completed, the current average value I0 is calculated:

[0021] I0=(I1+I2) / 2;

[0022] The next piece of deceleration current I3 = I0 + I1, the stop current I4 = I0 + I2, and return to step S3 to continue cutting.

[0023] Furthermore, after executing the low-speed feed, when the feed servo reaches the end position of current collection, the current I2 is collected and the real-time current value I is determined:

[0024] (1) When I6>I>I5, the feed servo speed drops to the intelligent deceleration speed S1;

[0025] (2) When I>I7, the feed servo speed drops to the intelligent deceleration speed S3;

[0026] (3) When I7>I>I6, the feed servo speed drops to the intelligent deceleration speed S2.

[0027] Furthermore, during the processing, the threshold value or the preset fixed position and speed are used in real time for deceleration, and the steps are as follows:

[0028] T1, set the deceleration starting position, deceleration end position, and slow saw speed;

[0029] T2, positioning the sawing end point at the feed speed;

[0030] T3. Determine the processing position:

[0031] (1) When the current feed value is equal to 0 or the current feed value is equal to the preset processing starting point value, it means that it is at the processing starting point;

[0032] (2) When the current feed value is greater than the deceleration starting point, that is, after passing the deceleration starting point, the feed speed is changed to the slow feed saw speed; after the slow feed saw starting point is positioned, the slow feed saw speed is executed;

[0033] (3) When the current feed value is greater than the deceleration end point, that is, after passing the deceleration end point, the feed speed is restored to the normal sawing speed; the slow sawing end point positioning is completed, and the process returns to step T2;

[0034] (4) When the current feed value is greater than the processing end point, that is, after passing the processing end point, the saw end point positioning is completed, and the feed is retracted; the saw starting point is positioned.

[0035] Furthermore, the current value is collected as follows: the control inverter of the cutting tool motor is connected to the serial port of the human-machine interface, the physical interface is RS-485, the communication protocol is the Modbus-RTU standard protocol, the touch screen is used as the master station, the inverter is used as the slave station, the touch screen sends messages through the Background macro program, and the inverter feeds back the real-time current value to the master station.

[0036] Furthermore, the current value collection steps are as follows: the starting point of the current value collection is determined by the processing starting point and starting offset position set in the human-machine interface, the processing end point and ending offset position determine the end point of the current collection, and then the actual current during the processing is calculated.

[0037] Beneficial effects of the present invention:

[0038] Compared with the prior art, the processing speed intelligent control method of the present invention has the following technical characteristics and beneficial effects:

[0039] (1) Adaptability and intelligence: The present invention realizes intelligent control of the processing process by real-time acquisition and analysis of current values ​​and dynamically adjusting the feed speed according to the change of current values. This adaptive adjustment method effectively solves the processing difficulties caused by the large difference in wood hardness in traditional processes, ensuring that the best processing effect can be achieved on wood of different hardness.

[0040] (2) Improve production efficiency and product quality: Through intelligent deceleration and high-speed / low-speed feeding switching, the present invention can improve production efficiency while ensuring product quality. The hardwood area uses low-speed feeding to reduce blade wear and product defects, while the softwood area uses high-speed feeding to improve cutting efficiency, thereby achieving a dynamic match between processing speed and wood hardness.

[0041] (3) Extending the service life of the cutting tool: By optimizing the feed speed and working mode switching method during the cutting process, the present invention reduces the frequent switching and impact of the cutting tool between cutting and no-load, thereby effectively extending the service life of the cutting tool and reducing production costs.

[0042] (4) Flexibility and scalability: The present invention is not only applicable to specific wood processing scenarios, but also can adjust the deceleration current base, stop current base, cutting times and other parameters according to actual needs to adapt to the processing needs of different types and specifications of wood. In addition, by adopting standard communication protocols and physical interfaces, the present invention is easy to integrate with other automation equipment and control systems, improving the flexibility and scalability of the system.

[0043] (5) Real-time monitoring and fault warning: During the processing, the present invention can monitor the current value in real time and issue fault warnings based on preset thresholds. When the real-time current value exceeds the preset alarm threshold, the system will automatically stop processing and alarm, effectively preventing production accidents and losses caused by equipment failure or improper operation.

[0044] (6) Improved processing accuracy: By precisely controlling the feed speed and number of cuts, the present invention can ensure accuracy and stability during the processing, reduce processing errors caused by human factors or equipment performance fluctuations, and improve the overall quality and consistency of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below in combination with the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0046] Figure 1 This is a functional flow chart of the intelligent deceleration method according to Embodiment 1 of the present invention;

[0047] Figure 2 This is the Background macro program diagram of Example 1 of the present invention;

[0048] Figure 3 PLC control program of embodiment 1 of the present invention Figure 1 ;

[0049] Figure 4 PLC control program of embodiment 1 of the present invention Figure 2 ;

[0050] Figure 5 PLC control program of embodiment 1 of the present invention Figure 3 ;

[0051] Figure 6 PLC control program of embodiment 1 of the present invention Figure 4 ;

[0052] Figure 7 This is a functional flow chart of the intelligent deceleration method according to Embodiment 2 of the present invention;

[0053] Figure 8 PLC control program of embodiment 2 of the present invention Figure 1 ;

[0054] Fig. 9 PLC control program of embodiment 2 of the present invention Figure 2 ;

[0055] Fig.10 PLC control program of embodiment 2 of the present invention Figure 3 ; DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Figure 1-10 The intelligent control method of processing speed is further explained.

[0057] Example 1

[0058] This embodiment provides an intelligent deceleration control method for decelerating in real time with reference to a threshold during the processing process, tracking the upper and lower fluctuation range of the working current value of the cutting tool motor during the cutting process of adjacent plates, and referring to the average current value when the previous piece was cut as the theoretical current reference value for the next piece of cutting.

[0059] By collecting the working current value of the cutting tool motor of the previous plate (except the first one), the average current value when the previous plate was cut is calculated. The deceleration current base and the shutdown current base are set according to actual experience. The real-time current during the cutting process of the next plate is used to refer to the deceleration current and shutdown current calculated for the previous plate to determine whether to decelerate or stop.

[0060] And by presetting the fixed deceleration speed for processing and the length of the deceleration area (deceleration starting position, deceleration end position), the blade can enter the wood for cutting at a relatively slow feed speed when cutting the wood, and resume the normal feed speed after the blade has fully entered the wood (the feed position is greater than the deceleration end position).

[0061] The specific technical solution of the present invention is:

[0062] 1. Current value collection method: Connect the control inverter of the cutting tool motor to the serial port of the human-machine interface. The physical interface is RS-485, the communication protocol is Modbus-RTU standard protocol, the touch screen is the master station, the inverter is the slave station, the touch screen sends messages through the Background macro program, and the inverter feeds back the real-time current value to the master station.

[0063] 2. Current value collection method: The starting point of the current value collection is determined by the processing starting point and the starting offset position set in the human-machine interface, and the end point of the current collection is determined by the processing end point and the end offset position, and then the actual current in the processing process is calculated. (Note: When a piece of material is processed for the first time, the current collection calculation is not performed, because the cutting amount is too small to actually reflect the real cutting current. And when the single thickness function is manually operated, the current collection calculation is not performed, because the wide range of cutting thickness changes, the hardness of the wood will also change widely, and cannot be used as a comparison condition. At this time, the fixed deceleration current and fixed stop current set by the touch screen are written into the deceleration current and stop current) If the intelligent deceleration function is not turned on, the real-time current collection calculation is not performed.

[0064] Process flow: By collecting the actual current value of the previous piece, and then according to the deceleration current base and stop current base set by the human-machine interface, the deceleration current and stop current allowed for the next cutting current are determined. If the actual current during this cutting is greater than the deceleration current calculated for the previous piece, the PLC controls the feed to reduce the cutting feed speed to the speed set by the intelligent deceleration (low speed). When the current returns to below the deceleration current, the PLC controls the feed to adjust the cutting feed speed to the set fixed feed speed (high speed).

[0065] The specific steps are as follows:

[0066] S1, set the deceleration current base I1 and the stop current base I2; the deceleration current base I1 and the stop current base I2 need to be preset, so that the program can refer to the deceleration current base. The stop current base I2 is also used to calculate the deceleration current threshold and the stop current threshold of the next plate; set the raw material thickness T, T represents the total thickness of the material to be cut, the cutting thickness T1, T1 represents the thickness of a single piece of material to be cut, and reserve the tail plate thickness T2, T2 represents the safe thickness after the equipment fixture is clamped, and calculate the number of cutting times n by the following formula:

[0067] n = (T – T2) / T1;

[0068] S2. Cut the plate once, peel and level it. If one side of the material is not completely cut flat after the first cut, the thickness of the plate will be inconsistent, resulting in defective products. Therefore, it is necessary to perform peeling and cutting once or more times to completely cut the first side flat to meet production requirements.

[0069] S3, cutting the plate again (at this time, the plate thickness cutting and peeling and leveling are not performed, and normal cutting processing is performed). When the feed servo reaches the starting position for collecting current, current collection I1 is performed;

[0070] S4. Determine the real-time current value I:

[0071] (1) When I>I4, the alarm stops and the process goes to step S1 to restart the process, where I4 is the threshold of the stop current;

[0072] (2) When I<I3, high-speed feeding is performed, where I3 represents the threshold value of the deceleration current;

[0073] (3) When I>I3, low-speed feeding is performed.

[0074] After high-speed feeding is executed, when the feed servo reaches the end position of current collection, the current I2 is collected. After the current cutting is completed, the current average value I0 is calculated:

[0075] I0=(I1+I2) / 2;

[0076] The next piece of deceleration current I3 = I0 + I1, the stop current I4 = I0 + I2, and return to step S3 to continue cutting.

[0077] After executing low-speed feeding, when the feeding servo reaches the end position of current collection, the current I2 is collected and the real-time current value I is determined:

[0078] (1) When I6>I>I5, the feed servo speed drops to the intelligent deceleration speed S1, where

[0079] I5 indicates the 1st gear deceleration current, I6 indicates the 2nd gear deceleration current, and S1 indicates the 1st gear speed;

[0080] (2) When I>I7, the feed servo speed drops to the intelligent deceleration speed S3, where I7 represents the 3rd gear deceleration current and S3 represents the 3rd gear speed;

[0081] (3) When I7>I>I6, the feed servo speed drops to the intelligent deceleration speed S2, where S2 represents the 2nd gear speed.

[0082] The present invention can effectively improve the production efficiency of the equipment, reduce the product defect rate, and extend the service life of the cutting tool.

[0083] Example 2

[0084] This embodiment provides an intelligent deceleration control method for decelerating in real time according to a threshold value or a preset fixed position and speed during a machining process.

[0085] When the material is about to enter the cutting tool (deceleration starting point), the feed speed is reduced to buffer the impact of the cutting tool contacting the material, and the cutting tool enters the material smoothly. When the cutting tool completely enters the material (deceleration end point), the feed speed is restored to the set sawing speed. Figure 7 As shown, the PLC control program diagram is as follows Figure 8-Figure 10 shown.

[0086] The specific steps are as follows:

[0087] T1, set the deceleration starting position, deceleration end position, and slow saw speed;

[0088] T2, positioning the sawing end point at the feed speed;

[0089] T3. Determine the processing position:

[0090] (2) When the current feed value is equal to 0 or the current feed value is equal to the preset processing starting point value, it means that it is at the processing starting point;

[0091] (2) When the current feed value is greater than the deceleration starting point, that is, after passing the deceleration starting point, the feed speed is changed to the slow feed saw speed; after the slow feed saw starting point is positioned, the slow feed saw speed is executed;

[0092] (3) When the current feed value is greater than the deceleration end point, that is, after passing the deceleration end point, the feed speed is restored to the normal sawing speed; the slow sawing end point positioning is completed, and the process returns to step T2;

[0093] (4) When the current feed value is greater than the processing end point, that is, after passing the processing end point, the saw end point positioning is completed, and the feed is retracted; the saw starting point is positioned.

[0094] Example 3

[0095] This embodiment is a combination of Embodiment 1 and Embodiment 2. According to actual production requirements, the control method of Embodiment 2 may be executed first, and then the control method of Embodiment 1 may be executed.

[0096] Embodiment 2 mainly focuses on speed control and position positioning during the sawing process. It accurately controls the speed change during the sawing process by setting the deceleration starting and end positions, as well as the slow feed saw speed, to ensure the stability and accuracy of the sawing process. In particular, when approaching the sawing end point, by reducing the feed speed, inaccurate sawing or material damage caused by excessive speed can be avoided.

[0097] Embodiment 1 focuses on dynamically adjusting the feed speed during sawing by current monitoring. It determines the load during sawing by comparing the real-time current value with the preset current base (such as the deceleration current base I1, the stop current base I2, etc.), and adjusts the feed speed accordingly. This method can more flexibly cope with the sawing needs of boards of different materials and thicknesses, and improve the efficiency and accuracy of sawing.

[0098] Combining these two embodiments, that is, executing embodiment 2 first and then embodiment 1, can improve the sawing stability: through the speed control and position positioning in embodiment 2, it can ensure that the sawing process is smoother when approaching the end point, and reduce sawing problems caused by excessive speed or inaccurate position. This provides a stable foundation for the current monitoring and speed adjustment in the subsequent embodiment 1. On the basis of embodiment 2, embodiment 1 further refines the adjustment of the feed speed through current monitoring. This dual control mechanism can more accurately respond to various changes in the sawing process, such as changes in material hardness, saw blade wear, etc., thereby improving the sawing accuracy.

[0099] Example 4

[0100] This embodiment provides a case of executing the intelligent control method of the present invention through PLC.

[0101] 1. Prepare a DOP-107DV touch screen and write a Background macro program, such as Figure 2 As shown;

[0102] 2. Prepare a T-022G / P inverter that controls the cutting tool motor, set the communication parameters, set the Pd-00 baud rate to 6 (19200 BPS), and set the Pd-01 data format to 2 (odd parity 8-O-1);

[0103] 3. Prepare a PLC model CP2E-N40DT-D and write the PLC control program, such as Figure 3-Figure 6 , Figure 8-Figure 10 shown.

[0104] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A processing speed intelligent control method, characterized in that: Here are the steps: Step 1: Execute slow-feed saw deceleration: perform fixed deceleration at the set fixed position length; Step 2: Execute intelligent deceleration: decelerate in real time according to the threshold value or preset fixed position and speed during the processing.

2. The processing speed intelligent control method according to claim 1, characterized in that: During the processing, refer to the threshold in real time to decelerate. The steps are as follows: S1, set the deceleration current base I1, stop current base I2; set the raw material thickness T, cutting thickness T1, reserved tail plate thickness T2, and calculate the number of cutting times n by the following formula: n = (T – T2) / T1; S2, cutting the plate once, peeling and leveling; S3, cutting the plate again, when the feed servo reaches the starting position of current collection, current collection I1 is performed; S4. Determine the real-time current value I: (1) When I>I4, the alarm stops and the process goes to step S1 to restart the process, where I4 is the threshold of the stop current; (2) When I<I3, high-speed feeding is performed, where I3 represents the threshold value of the deceleration current; (3) When I>I3, low-speed feeding is performed.

3. The processing speed intelligent control method according to claim 2, characterized in that: After high-speed feeding is executed, when the feed servo reaches the end position of current collection, the current I2 is collected. After the current cutting is completed, the current average value I0 is calculated: I0=(I1+I2) / 2; The next piece of deceleration current I3 = I0 + I1, the stop current I4 = I0 + I2, and return to step S3 to continue cutting.

4. The processing speed intelligent control method according to claim 2, characterized in that: After executing low-speed feeding, when the feeding servo reaches the end position of current collection, the current I2 is collected and the real-time current value I is determined: (1) When I6>I>I5, the feed servo speed drops to the intelligent deceleration speed S1, where I5 ​​represents the 1st gear deceleration current, I6 represents the 2nd gear deceleration current, and S1 represents the 1st gear speed; (2) When I>I7, the feed servo speed drops to the intelligent deceleration speed S3, where I7 represents the 3rd gear deceleration current and S3 represents the 3rd gear speed; (3) When I7>I>I6, the feed servo speed drops to the intelligent deceleration speed S2, where S2 represents the 2nd gear speed.

5. The processing speed intelligent control method according to claim 1, characterized in that: During the processing, refer to the threshold in real time or preset fixed position and speed to slow down. The steps are as follows: T1, set the deceleration starting position, deceleration end position, and slow saw speed; T2, positioning the sawing end point at the feed speed; T3. Determine the processing position: (1) When the current feed value is equal to 0 or the current feed value is equal to the preset processing starting point value, it means that it is at the processing starting point; (2) When the current feed value is greater than the deceleration starting point, that is, after passing the deceleration starting point, the feed speed is changed to the slow feed saw speed; after the slow feed saw starting point is positioned, the slow feed saw speed is executed; (3) When the current feed value is greater than the deceleration end point, that is, after passing the deceleration end point, the feed speed is restored to the normal sawing speed; the slow sawing end point positioning is completed, and the process returns to step T2; (4) When the current feed value is greater than the processing end point, that is, after passing the processing end point, the saw end point positioning is completed, and the feed is retracted; the saw starting point is positioned.

6. The processing speed intelligent control method according to any one of claims 2 to 5, characterized in that: The current value collection method is as follows: connect the control inverter of the cutting tool motor to the serial port of the human-machine interface. The physical interface is RS-485, the communication protocol is the Modbus-RTU standard protocol, the touch screen is the master station, the inverter is the slave station, the touch screen sends messages through the Background macro program, and the inverter feeds back the real-time current value to the master station.

7. The processing speed intelligent control method according to claim 6, characterized in that: The specific steps for current value collection are as follows: the starting point of current collection is determined by the processing starting point and starting offset position set in the human-machine interface, the processing end point and ending offset position are used to determine the end point of current collection, and then the actual current in the processing process is calculated.

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