A welding method, device, equipment and storage medium for a tearing knife

Abstract

This application discloses a method, device, equipment, and storage medium for welding a tearing knife, relating to the field of welding technology. The method comprises: obtaining the thickness of a knife holder to be welded, the ambient temperature of the environment in which the knife holder is located, and a first heating duration for the knife holder; determining a first variation curve of the internal temperature versus heating duration based on the thickness of the knife holder and the ambient temperature of the knife holder; determining a first internal temperature corresponding to the first heating duration based on the first variation curve; and welding the tearing knife to the knife holder when the minimum value of the first internal temperature and the first external temperature is greater than or equal to a preset welding temperature threshold, wherein the first external temperature is the surface temperature of the knife holder. This method can improve welding reliability.

Description

Technical Field

[0001] The present application relates to the field of welding technology, and in particular to a welding method, device, equipment and storage medium for a tearing knife. Background Art

[0002] In urban underground space development and infrastructure construction, shield machines (TBMs), the core equipment for tunneling, directly determine construction efficiency and safety. The tearing cutter, a key component of the TBM for navigating complex strata (such as hard rock and gravel), must withstand high-frequency impact loads and intense friction. Therefore, the weld quality between the cutterhead and the blade is a key factor in determining the tool's lifespan.

[0003] The current tearing knife welding process adopts a three-stage control process of "preheating-temperature measurement-welding": first, the tool holder (usually high-strength alloy steel with a thickness of 30-50mm) and the blade (made of carbide) are preheated as a whole, and the temperature of the area to be welded is increased by resistance heating or flame heating. The goal is to control the initial temperature of the welding interface at 150-200℃ to reduce the hot and cold temperature difference stress during welding; secondly, during the preheating process, contact thermocouples are used to monitor the real-time temperature of 3-5 measuring points on the tool holder surface (within 50mm around the welding groove) and the tail of the blade. When all measuring points stably exceed the preset temperature (error ±5℃) for 30 consecutive seconds, the welding program is triggered; finally, gas metal arc welding (GMAW) is used for welding, and the surface temperature is continuously monitored during the welding process to ensure that the heat input meets the process specifications.

[0004] The core defect of the above solution is that it fails to effectively solve the problem of "temperature penetration lag" in thick-walled tool holders. ) and its large thickness result in a significant time lag in heat conduction from the outside to the inside. When the surface temperature reaches the preset value detected by thermocouples, the temperature within the area more than 10mm from the surface may still be below the critical temperature (e.g., below 100°C). This "hot outside, cold inside" temperature distribution prevents the formation of a uniform heat-affected zone (HAZ) within the internal matrix after the surface metal melts during welding. During cooling, significant contraction stress (approximately 200-300 MPa) is generated between the weld metal and the matrix. When this stress exceeds the material's fracture strength, cold cracks (typically 2-5 mm in length) form in the toolholder's HAZ or near the weld fusion line. These cracks rapidly expand under alternating loads, leading to blade loss or toolholder breakage after 50-100 hours of use.

[0005] Therefore, the current technical solutions for welding have the problem of poor reliability. Summary of the Invention

[0006] The present application provides a welding method, device, equipment and storage medium for a tearing knife, which can improve the reliability of welding.

[0007] To achieve the above objectives, this application adopts the following technical solutions:

[0008] In a first aspect, the present application provides a method for welding a tearing knife, the method comprising:

[0009] Obtaining the thickness of the tool holder to be welded, the ambient temperature of the environment in which the tool holder is located, and the first heating time of the tool holder;

[0010] determining a first variation curve of internal temperature versus heating time according to the thickness of the knife seat and the ambient temperature of the knife seat;

[0011] determining a first internal temperature corresponding to the first heating duration according to the first variation curve;

[0012] When a minimum value of the first internal temperature and the first external temperature is greater than or equal to a preset welding temperature threshold, the tearing knife and the knife holder are welded, wherein the first external temperature is a surface temperature of the knife holder.

[0013] Optionally, determining a first variation curve of the internal temperature versus heating time based on the thickness of the tool holder and the ambient temperature of the tool holder includes:

[0014] Determining a first thickness range in which the thickness of the tool holder is located, and determining a first ambient temperature range in which the ambient temperature of the tool holder is located;

[0015] According to the mapping relationship between the thickness interval, the ambient temperature interval and the variation curve, a first variation curve of the internal temperature versus the heating time that matches the first thickness interval and the first ambient temperature interval is determined.

[0016] Optionally, the change curve is obtained by fitting in the following manner:

[0017] Perform the following steps for sample blade holders of different thicknesses:

[0018] Determine N sample tool holders and M ambient temperature intervals, wherein the N sample tool holders have different opening depths in a radial direction of the tool holder thickness, and both M and N are integers greater than 1;

[0019] The N sample knife holders are heated in M ​​ambient temperature intervals in sequence, and N internal temperature variation curves corresponding to the M ambient temperature intervals as a function of heating time are obtained.

[0020] Optionally, the method further includes:

[0021] Get the weld width;

[0022] Determine the relationship between the weld width and a width threshold corresponding to the thickness of the tool holder to obtain a first determination result;

[0023] If the first judgment result indicates that the weld width is greater than or equal to a width threshold, the weld between the knife holder and the tearing knife is ground.

[0024] Optionally, the method further includes:

[0025] If the first judgment result indicates that the weld width is smaller than the width threshold, a welding abnormality is indicated.

[0026] Optionally, after grinding the welding portion between the knife holder and the tearing knife, the method further comprises:

[0027] The welding point between the knife holder and the tearing knife is subjected to a cooling treatment, wherein the temperature change rate of the cooling process is less than or equal to the preset change rate, and the cooling time of the cooling process is greater than or equal to the preset time.

[0028] Optionally, the preset welding temperature threshold is dynamically determined by:

[0029] Determine basal temperature threshold;

[0030] The preset welding temperature threshold is determined according to the basic temperature threshold, the thickness of the tool holder, the ambient temperature of the tool holder, and a material correction coefficient.

[0031] In a second aspect, the present application provides a welding device for a tearing knife, the device comprising:

[0032] an acquisition unit, configured to acquire the thickness of the tool holder to be welded, the ambient temperature of the environment in which the tool holder is located, and a first heating time for the tool holder;

[0033] a processing unit, configured to determine a first variation curve of internal temperature versus heating time based on a thickness of the knife holder and an ambient temperature of the knife holder; and determine a first internal temperature corresponding to the first heating time based on the first variation curve;

[0034] A welding unit is used to weld the tearing knife and the knife holder when the minimum value of the first internal temperature and the first external temperature is greater than or equal to a preset welding temperature threshold, wherein the first external temperature is the surface temperature of the knife holder.

[0035] In a third aspect, the present application provides a computing device, including a memory and a processor;

[0036] One or more computer programs are stored in the memory, and the one or more computer programs include instructions; when the instructions are executed by the processor, the computing device executes the method as described in any one of the first aspects.

[0037] In a fourth aspect, the present application provides a computer-readable storage medium for storing a computer program for executing the method as described in any one of the first aspects.

[0038] It can be seen from the above technical solution that this application has at least the following beneficial effects:

[0039] This welding method targets the core problem of cold cracks caused by "temperature penetration lag" in thick-walled tool holders. By obtaining the tool holder thickness, ambient temperature and heating time, it constructs a first change curve of the internal temperature over time, accurately predicts the temperature distribution at different depths, and breaks through the limitation of traditional reliance on surface temperature monitoring, avoiding misjudgment of welding timing caused by "hot outside and cold inside". By comparing whether the minimum value of the first internal temperature and the surface temperature reaches the welding temperature threshold, it ensures that the temperatures inside and outside the tool holder welding area meet the welding requirements, effectively solving the problem of uneven heat-affected zone caused by insufficient internal temperature, significantly reducing the shrinkage stress between the weld and the substrate during the cooling process, fundamentally inhibiting the generation of cold cracks, improving the structural strength and fatigue resistance of the welded joint, greatly reducing the risk of tool failure due to welding defects, improving welding reliability, ensuring the continuity of shield construction, extending the tool life and reducing construction costs.

[0040] It should be understood that the description of technical features, technical solutions, beneficial effects or similar language in this application does not imply that all features and advantages can be realized in any single embodiment. On the contrary, it is understood that the description of a feature or beneficial effect means that a specific technical feature, technical solution or beneficial effect is included in at least one embodiment. Therefore, the description of a technical feature, technical solution or beneficial effect in this specification does not necessarily refer to the same embodiment. Furthermore, the technical features, technical solutions and beneficial effects described in the present embodiment can also be combined in any appropriate manner. Those skilled in the art will understand that the embodiment can be implemented without one or more specific technical features, technical solutions or beneficial effects of a specific embodiment. In other embodiments, additional technical features and beneficial effects can also be identified in specific embodiments that do not embody all embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A flow chart of a method for welding a tearing knife provided in an embodiment of the present application;

[0042] Figure 2A schematic diagram of a welding device for a tearing knife provided in an embodiment of the present application;

[0043] Figure 3 A schematic diagram of a computing device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0044] The terms "first", "second" and "third" in this application specification and the accompanying drawings are used to distinguish different objects rather than to limit a specific order.

[0045] In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be interpreted as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0046] To make the description of the following embodiments clear and concise, a brief introduction to the related technologies is first given:

[0047] Before a shield machine begins operations, a detailed ground survey of the planned tunneling path is conducted to assess the ground characteristics. This information informs the appropriate cutterhead tool type. If the survey indicates that the path is dominated by soft ground, disc cutters may not be required, optimizing tunneling efficiency and machine performance.

[0048] Therefore, when soft soil slurry shield machines were initially designed, conventional cutters were only suitable for excavating soft soil formations. When encountering strong reinforced strata in short periods of time, the cutter alloy blocks would often be damaged. Performing hot work under pressure would delay construction schedules, be difficult, and present a high risk. Hot work under pressure requires air testing and a lengthy gas replacement process. Furthermore, due to the high humidity in the slurry silo, the weld surface must be completely dry before the next welding step, which is difficult and time-consuming, potentially delaying project progress. Therefore, after comprehensive considerations, hot work was not adopted. Damaged cutters were removed and transported for further processing. This necessitated tool modification. This method, which utilizes discarded cutterheads and welds modified cutter heads with specially angled rip cutter heads, effectively addresses the brief occurrence of hard cement formations, such as those in reinforced areas, during excavation. The principle is that as the cutterhead rotates, the angled rip cutter heads create a strong shear force between the cutterhead and the tunnel face, severing the hard strata and completing the excavation.

[0049] The current tear blade welding process utilizes a three-step process: preheating, temperature measurement, and welding. First, the blade holder (typically made of high-strength alloy steel, 30-50mm thick) and the blade (made of carbide) are preheated. Resistance heating or flame heating is used to raise the temperature of the weld area. The goal is to maintain an initial interface temperature of 150-200°C to reduce thermal stress during welding. Second, during the preheating process, contact thermocouples are used to monitor the temperature of the blade holder surface (within 50mm of the weld groove) and at three to five measurement points on the blade tail. When all measurement points consistently exceed a preset temperature (with an accuracy of ±5°C) for 30 consecutive seconds, the welding process is initiated. Finally, gas metal arc welding (GMAW) is used for welding, with surface temperature continuously monitored throughout the process. However, this solution fails to effectively address the "temperature penetration lag" problem of thick-walled blade holders, resulting in a hot exterior and cold interior, leading to poor welding reliability.

[0050] In view of this, an embodiment of the present application provides a method for welding a tearing knife, which can be performed by a processing device, wherein the processing device can be a terminal or a server. Terminals include but are not limited to smartphones, tablets, laptops, personal digital assistants, or smart wearable devices. The server can be a cloud server, such as a central server in a central cloud computing cluster, or an edge server in an edge cloud computing cluster. Of course, the server can also be a server in a local data center. A local data center refers to a data center directly controlled by the user.

[0051] In order to make the technical solution of the present application clearer and easier to understand, the technical solution of the present application is introduced below with reference to the accompanying drawings.

[0052] like Figure 1 As shown in FIG. 1 , this figure is a flow chart of a method for welding a tearing knife provided in an embodiment of the present application. The method includes:

[0053] S101: A processing device obtains the thickness of a tool holder to be welded, the ambient temperature of an environment in which the tool holder is located, and a first heating time for the tool holder.

[0054] The thickness of the toolholder refers to the thickness of the material at the welded portion (e.g., 30-50 mm), a key parameter affecting heat transfer. In some cases, processing equipment can scan the toolholder surface profile using a laser rangefinder or use an ultrasonic thickness gauge to measure multiple points and average the results to ensure accurate thickness data.

[0055] The ambient temperature refers to the real-time temperature of the environment where the toolholder is located (such as 5 - 45 °C), which affects the initial thermal state of the toolholder. In some examples, the processing device can evenly arrange 3 thermocouple sensors around the toolholder and calculate the average value through a weighted algorithm (the sensors closer to the toolholder have a higher weight).

[0056] The first heating duration refers to the duration from the start of heating to the current moment (such as 0 - 300 seconds), which is used for time dimension positioning of the subsequent temperature curve. In some examples, the processing device can directly read the timer of the heating control system or can time separately.

[0057] S102. The processing device determines a first change curve of the internal temperature with respect to the heating duration according to the thickness of the toolholder and the ambient temperature where the toolholder is located.

[0058] The first change curve: It reflects the functional relationship of the temperature at a specific depth inside the toolholder (such as 15 mm, 25 mm) changing with the heating time, and is obtained by fitting experimental data or calculating through a heat conduction model.

[0059] When the intervals of the thickness of the toolholder and the ambient temperature where the toolholder is located are different, the corresponding change curves of the internal temperature with respect to the heating duration are different.

[0060] Therefore, the processing device needs to first determine the first change curve of the internal temperature with respect to the heating duration based on the thickness of the toolholder and the ambient temperature where it is located.

[0061] In some examples, the processing device determines a first thickness interval in which the thickness of the toolholder is located, and determines a first ambient temperature interval in which the ambient temperature where the toolholder is located is located; according to the mapping relationship between the thickness interval, the ambient temperature interval and the change curve, it determines a first change curve of the internal temperature with respect to the heating duration that matches the first thickness interval and the first ambient temperature interval.

[0062] The thickness interval can be a pre-divided thickness range interval (such as divided into 3 grades) to simplify the influence of thickness on temperature conduction. Example: thin part interval d < 20 mm, medium-thick part interval 20 mm < d < 50 mm, thick part interval d > 50 mm.

[0063] The ambient temperature interval can be a pre-divided ambient temperature range interval (such as divided into 3 grades) to quantify the influence of the environment on the heating efficiency. Example: low temperature interval Ta < 10 °C, normal temperature interval 10 °C < Ta < 30 °C, high temperature interval Ta > 30 °C.

[0064] Among them, the mapping relationship between the thickness interval, the ambient temperature interval and the change curve is shown in Table 1 below.

[0065] Table 1: Mapping relationship table of thickness interval, ambient temperature interval and change curve.

[0066]

[0067] In some embodiments, the change curve can be obtained by fitting in the following way:

[0068] Perform the following steps for sample blade holders of different thicknesses:

[0069] The processing equipment determines N sample tool holders and M ambient temperature intervals, where the N sample tool holders have different opening depths in the radial direction of the tool holder thickness, and M and N are both integers greater than 1; the N sample tool holders are heated in the M ambient temperature intervals in turn, and N internal temperature change curves corresponding to each of the M ambient temperature intervals as a function of heating time are obtained.

[0070] Sample tool holders can be selected from standard tool holders of varying thicknesses (e.g., 20mm, 30mm, and 60mm). Each tool holder has a hole drilled through the thickness (from the surface to the interior) at a specific depth (e.g., 5mm, 15mm, and 25mm below the surface) for embedding thermocouples to measure internal temperature. In the radial direction of each tool holder, locations with the largest temperature gradients (e.g., 1 / 6, 1 / 3, and 1 / 2 of the thickness) calculated according to Fourier's law of heat conduction are designated as thermocouple embedding points.

[0071] Testing process:

[0072] Place the sample tool holder in a high-low temperature test chamber and adjust it to the target temperature range (e.g., 20°C). Allow it to stabilize for 2 hours to ensure uniform temperature inside the tool holder. Activate the bottom resistance heating plate and set the surface target temperature to 200°C (welding preheat standard). Collect temperature data from each thermocouple every 5 seconds for 300 seconds (covering a typical preheat time).

[0073] For N sample tool holders (e.g. N=3, thicknesses of 20mm, 30mm, and 60mm respectively), test them in M ​​ambient temperature ranges (e.g. M=3, temperatures of 5°C, 25°C, and 45°C respectively), and a total of N×M=9 independent tests need to be completed.

[0074] An example of data collection for a 30mm toolholder and 25°C ambient temperature is shown in Table 2 below.

[0075] Table 2: Example data collection table for a 30mm toolholder and 25°C ambient temperature.

[0076]

[0077] After completing the data collection, N×M curves of internal temperature variation with heating time can be generated.

[0078] In some examples, for each test data point, the following function can be fitted:

[0079]

[0080] in, represents the internal temperature, Ta is the ambient temperature of the test data point, Tset is the surface target temperature (200°C) of the test data point, and k is the time constant (inversely proportional to the thickness).

[0081] The processing equipment can then solve the optimal parameter k by the least square method so that the mean square error between the fitting curve and the measured data is less than 5°C.

[0082] For example, for a 20mm toolholder at 25°C and a depth of 15mm, the curve parameter k is 0.015, and the curve equation is: The curve parameter k of a 50mm toolholder at a depth of 25mm at a temperature of 5°C is 0.007, and the curve equation is: .

[0083] Based on the above curve fitting process, the variation curves of the internal temperature corresponding to different depths with heating time can be obtained at the same thickness and the same ambient temperature.

[0084] S103: The processing device determines a first internal temperature corresponding to the first heating time according to the first change curve.

[0085] The first variation curve includes multiple curves corresponding to different depths, and the first internal temperature includes multiple temperatures. Therefore, the processing device can determine the temperatures corresponding to the multiple different depths based on the multiple curves.

[0086] For example, the first change curve includes a curve at a depth of 5 mm, a curve at a depth of 15 mm, and a curve at a depth of 25 mm, and the first internal temperature includes a temperature at a depth of 5 mm, a temperature at a depth of 15 mm, and a temperature at a depth of 25 mm.

[0087] As heating progresses, the processing device can obtain the corresponding first internal temperature through the first variation curve. For example, the heating time is substituted into the expressions corresponding to the above multiple curves to obtain the corresponding internal temperature.

[0088] S104: When the minimum value of the first internal temperature and the first external temperature is greater than or equal to a preset welding temperature threshold, the processing device welds the tearing knife to the knife holder.

[0089] The first external temperature is the surface temperature of the blade holder. If the minimum of the first internal temperature and the first external temperature is greater than or equal to a preset welding temperature threshold, it indicates that the lowest temperature position of the blade holder to be welded has reached the preset welding temperature threshold. Performing welding at this point can improve welding reliability. The processing device welding the tearing blade to the blade holder can be performed by the processing device controlling a welding device, which then performs the welding process on the tearing blade and the blade holder.

[0090] In the embodiment of the present application, the welding method targets the core problem of cold cracks caused by "temperature penetration lag" in thick-walled tool holders. By obtaining the tool holder thickness, ambient temperature and heating time, a first change curve of the internal temperature over time is constructed, and the temperature distribution at different depths is accurately predicted, breaking through the limitation of traditional reliance on surface temperature monitoring, and avoiding the misjudgment of welding timing caused by "hot outside and cold inside"; by comparing whether the minimum value of the first internal temperature and the surface temperature reaches the welding temperature threshold, it ensures that the temperatures inside and outside the tool holder welding area meet the welding requirements, effectively solves the problem of uneven heat-affected zone caused by insufficient internal temperature, significantly reduces the shrinkage stress between the weld and the substrate during the cooling process, fundamentally inhibits the generation of cold cracks, improves the structural strength and fatigue resistance of the welded joint, greatly reduces the risk of tool failure due to welding defects, improves the reliability of welding, ensures the continuity of shield construction, extends the service life of the tool and reduces construction costs.

[0091] In some embodiments, the processing device may further obtain a weld width, and then determine a relationship between the weld width and a width threshold corresponding to the thickness of the blade holder to obtain a first determination result. If the first determination result indicates that the weld width is greater than or equal to the width threshold, the weld between the blade holder and the tearing blade is polished. If the first determination result indicates that the weld width is less than the width threshold, a welding abnormality is indicated.

[0092] The weld width refers to the lateral extension of the weld on the toolholder surface after welding (unit: mm), directly reflecting the extent of the molten pool. Processing equipment can use a line laser sensor to project a laser line onto the weld surface. A camera captures the reflected light and calculates the weld contour using triangulation principles with an accuracy of ±0.05mm. Alternatively, processing equipment can use an industrial camera to capture weld images, convert them to grayscale and binarization, and then use edge detection algorithms (such as the Sobel operator) to extract the weld edges. The pixel distance between the two edges is calculated and converted to physical dimensions.

[0093] If the processing equipment determines that the weld width is acceptable (i.e., greater than or equal to the width threshold), it performs grinding to eliminate weld excess height (typically 15%-20% of the weld width) and reduce the stress concentration factor (from 2.3 to below 1.6). If the processing equipment determines that the weld width is unacceptable (i.e., less than the width threshold), it issues an abnormality alarm. For example, this can be indicated by a red warning on the interface (e.g., "Weld width insufficient, current 12.3mm, threshold 13.5mm") or an intermittent high-frequency buzzer (85dB). The processing equipment also records data, automatically saving the location coordinates of the abnormal weld and welding parameters (current, voltage, and speed).

[0094] The processing device may grind the welded portion by controlling the grinding device to grind the welded portion. For example, the processing device sends a grinding instruction to the grinding device, and the grinding device grinds the welded portion after receiving the grinding instruction.

[0095] In the embodiment of the present application, a closed-loop quality control system is constructed by real-time monitoring of the weld width and graded processing: Prevention of cold cracks: Ensure that the weld width matches the tool holder thickness, so that the penetration reaches 40%-50% of the parent material thickness, and avoid root cracks caused by poor fusion; Improve fatigue life: Grinding treatment makes the weld surface roughness Ra≤6.3μm and the transition fillet radius ≥3mm, significantly reducing stress concentration (fatigue strength increased by more than 30%); Improve production efficiency: Automatic detection and processing replace manual visual inspection, reduce rework rate (from 15% to 3%), and shorten the single-knife production cycle by 15 minutes; Achieve quality traceability: Abnormal data is automatically stored in the system, and an electronic file of welding quality is generated to support full life cycle management.

[0096] In some embodiments, the processing equipment can also perform cooling treatment on the welding point between the knife holder and the tearing knife, wherein the temperature change rate of the cooling process is less than or equal to the preset change rate, and the cooling time of the cooling process is greater than or equal to the preset time.

[0097] Similarly, the processing device can send instructions to the temperature control system, and the temperature control system performs temperature control based on the instructions, such as cooling.

[0098] The temperature gradient is the rate of temperature drop per unit time (unit: °C / min). For example, if it takes 20 minutes to drop from 200°C to 100°C, the gradient is 5°C / min. The preset gradient is determined based on the critical cooling rate of the toolholder material to avoid excessive cooling, which can lead to a hard and brittle martensite structure.

[0099] In the embodiment of the present application, the temperature-controlled cooling process solves the problem of uneven structure caused by traditional natural cooling by precisely controlling the cooling rate and duration. Avoid cold cracks: control the cooling rate below the critical value of the material (such as the martensitic transformation rate of 42CrMo is about 15°C / min) to prevent cracks caused by excessive phase change stress. Eliminate residual stress: slowly cool the weld metal to fully temper in the temperature range of 600-400°C (the stress relaxation rate in this range is more than 80%), and the residual stress is reduced from 300MPa to less than 100MPa. Refine the grains: by controlling the residence time in the phase change temperature range (such as The weld is then cooled and held near the weld point for 5-8 minutes, refining the austenite grains to levels 5-8 (compared to levels 3-5 with conventional processes), improving weld toughness (impact energy increased from 30J to 50J). Improved fatigue resistance: The tempered bainite structure (hardness ≤ 280HB) formed by slow cooling has better fatigue resistance than the bainite structure (hardness ≥ 320HB) formed by rapid cooling, increasing fatigue life by over 40%.

[0100] In some embodiments, the preset welding temperature threshold is dynamically determined by:

[0101] Determine a basic temperature threshold; determine the preset welding temperature threshold according to the basic temperature threshold, the thickness of the tool holder, the ambient temperature of the tool holder and the material correction factor.

[0102] Specifically, the preset welding temperature threshold can be dynamically determined by the following formula:

[0103]

[0104] in, Indicates the preset welding temperature threshold, Indicates the basic temperature threshold, It represents the material correction factor, which can be determined by the carbon equivalent value (CEV). The higher the CEV, the easier it is to produce hardened structure and cold cracks when the steel is welded. The larger the CEV, the larger j. Indicates the thickness of the tool holder. Indicates the ambient temperature.

[0105] In an embodiment of the present application, the method constructs a dynamic threshold formula by integrating the tool holder thickness, ambient temperature and material carbon equivalent (CEV) to achieve intelligent adaptation of the preheating temperature: the threshold is automatically increased when the thickness is greater or the ambient temperature is lower to ensure sufficient heat input. For high carbon equivalent materials (CEV>0.45), preheating is enhanced by a correction coefficient to reduce the risk of cracks. Compared with a fixed threshold, the welding heat input error can be narrowed by 62.5%, significantly improving the temperature control accuracy and welding quality consistency under different working conditions, and reducing the risk of cold cracks and rework rate caused by improper temperature.

[0106] Combined with the above Figure 1 The welding method of the tearing knife provided in the embodiment of the present application is introduced in detail. The device and equipment provided in the embodiment of the present application will be introduced in conjunction with the accompanying drawings.

[0107] like Figure 2 As shown, this figure is a schematic diagram of a welding device for a tearing knife provided in an embodiment of the present application, the device comprising:

[0108] An acquisition unit 201 is configured to acquire the thickness of the tool holder to be welded, the ambient temperature of the environment in which the tool holder is located, and a first heating time for the tool holder;

[0109] The processing unit 202 is configured to determine a first variation curve of the internal temperature versus heating time based on the thickness of the tool holder and the ambient temperature of the tool holder; and determine a first internal temperature corresponding to the first heating time based on the first variation curve.

[0110] The welding unit 203 is used to weld the tearing knife and the knife holder when the minimum value of the first internal temperature and the first external temperature is greater than or equal to a preset welding temperature threshold, wherein the first external temperature is the surface temperature of the knife holder.

[0111] Optionally, the processing unit 202 is specifically used to determine a first thickness range in which the thickness of the tool holder is located, and to determine a first ambient temperature range in which the ambient temperature of the tool holder is located; and to determine a first change curve of the internal temperature versus heating time that matches the first thickness range and the first ambient temperature range based on a mapping relationship among thickness ranges, ambient temperature ranges, and change curves.

[0112] Optionally, the change curve is obtained by fitting in the following manner:

[0113] Perform the following steps for sample blade holders of different thicknesses:

[0114] Determine N sample tool holders and M ambient temperature intervals, wherein the N sample tool holders have different opening depths in a radial direction of the tool holder thickness, and both M and N are integers greater than 1;

[0115] The N sample knife holders are heated in M ​​ambient temperature intervals in sequence, and N internal temperature variation curves corresponding to the M ambient temperature intervals as a function of heating time are obtained.

[0116] Optionally, the acquisition module 201 is further configured to acquire the weld width;

[0117] The processing module 202 is also used to determine the size relationship between the weld width and the width threshold corresponding to the thickness of the knife holder to obtain a first judgment result; if the first judgment result indicates that the weld width is greater than or equal to the width threshold, the welding point between the knife holder and the tearing knife is polished.

[0118] Optionally, the processing module 202 is further configured to indicate a welding abnormality if the first judgment result indicates that the weld width is smaller than a width threshold.

[0119] Optionally, the processing module 202 is further used to perform a cooling treatment on the welding point between the knife holder and the tearing knife, wherein the temperature change rate of the cooling process is less than or equal to the preset change rate, and the cooling time of the cooling process is greater than or equal to the preset time.

[0120] Optionally, the preset welding temperature threshold is dynamically determined by:

[0121] Determine basal temperature threshold;

[0122] The preset welding temperature threshold is determined according to the basic temperature threshold, the thickness of the tool holder, the ambient temperature of the tool holder, and a material correction coefficient.

[0123] The welding device of the tearing knife according to the embodiment of the present application may correspond to the method described in the embodiment of the present application, and the above-mentioned other operations and / or functions of each module / unit of the welding device of the tearing knife are respectively to realize Figure 1 For the sake of brevity, the corresponding processes of the various methods in the illustrated embodiments are not described again here.

[0124] The present application also provides a computing device. Figure 3 As shown, this figure is a schematic diagram of a computing device provided by an embodiment of the present application, and the computing device 700 includes a bus 701, a processor 702, a communication interface 703 and a memory 704. The processor 702, the memory 704 and the communication interface 703 communicate with each other via the bus 701.

[0125] The bus 701 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 3 Only one thick line is used in the diagram, but this does not mean that there is only one bus or one type of bus.

[0126] The processor 702 may be any one or more of a central processing unit (CPU), a graphics processing unit (GPU), a microprocessor (MP), or a digital signal processor (DSP).

[0127] The communication interface 703 is used for communicating with the outside.

[0128] The memory 704 may include volatile memory, such as random access memory (RAM). The memory 704 may also include non-volatile memory, such as read-only memory (ROM), flash memory, hard disk drive (HDD), or solid state drive (SSD).

[0129] The memory 704 stores executable codes, and the processor 702 executes the executable codes to perform the aforementioned tearing knife welding method.

[0130] Specifically, in the implementation Figure 2 In the case of the embodiment shown, and Figure 2 When each module or unit of the welding device of the tearing knife described in the embodiment is realized by software, the execution Figure 2 The software or program code required for the functions of each module / unit in the device may be partially or completely stored in the memory 704. The processor 702 executes the program code corresponding to each unit stored in the memory 704 to perform the aforementioned tearing knife welding method.

[0131] Embodiments of the present application also provide a computer-readable storage medium. The computer-readable storage medium can be any available medium capable of being stored by a computing device, or a data storage device such as a data center that contains one or more available media. The available medium can be a magnetic medium (e.g., a floppy disk, hard disk, or magnetic tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state drive). The computer-readable storage medium includes instructions that instruct the computing device to execute the aforementioned tearing knife welding method.

[0132] The present application also provides a computer program product comprising one or more computer instructions that, when loaded and executed on a computing device, fully or partially generate the process or function described in the present application.

[0133] The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from one website, computer, or data center to another website, computer, or data center via wired (e.g., coaxial cable, optical fiber, digital subscriber line) or wireless (e.g., infrared, wireless, microwave, etc.) means.

[0134] When the computer program product is executed by a computer, the computer executes any of the aforementioned tearing knife welding methods. The computer program product may be a software installation package, which can be downloaded and executed on the computer when any of the aforementioned tearing knife welding methods is required.

[0135] The descriptions of the processes or structures corresponding to the above figures have different emphases. For parts that are not described in detail in a certain process or structure, please refer to the relevant descriptions of other processes or structures.

[0136] The above description is only a specific implementation method of the present application, but the protection scope of the present application is not limited thereto. Any changes or replacements within the technical scope disclosed in the present application should be included in the protection scope of the present application.

Claims

1. A method for welding a tearing knife, characterized in that: The method comprises: Obtaining the thickness of the tool holder to be welded, the ambient temperature of the environment in which the tool holder is located, and the first heating time of the tool holder; determining a first variation curve of internal temperature versus heating time according to the thickness of the knife seat and the ambient temperature of the knife seat; determining a first internal temperature corresponding to the first heating duration according to the first variation curve; When a minimum value of the first internal temperature and the first external temperature is greater than or equal to a preset welding temperature threshold, the tearing knife and the knife holder are welded, wherein the first external temperature is a surface temperature of the knife holder.

2. The method according to claim 1, characterized in that Determining a first variation curve of the internal temperature versus heating time based on the thickness of the tool holder and the ambient temperature of the tool holder includes: Determining a first thickness range in which the thickness of the tool holder is located, and determining a first ambient temperature range in which the ambient temperature of the tool holder is located; According to the mapping relationship between the thickness interval, the ambient temperature interval and the variation curve, a first variation curve of the internal temperature versus the heating time that matches the first thickness interval and the first ambient temperature interval is determined.

3. The method according to claim 2, characterized in that The variation curve is obtained by fitting in the following way: Perform the following steps for sample blade holders of different thicknesses: Determine N sample tool holders and M ambient temperature intervals, wherein the N sample tool holders have different opening depths in a radial direction of the tool holder thickness, and both M and N are integers greater than 1; The N sample knife holders are heated in M ​​ambient temperature intervals in sequence, and N internal temperature variation curves corresponding to the M ambient temperature intervals as a function of heating time are obtained.

4. The method according to any one of claims 1 to 3, characterized in that The method further comprises: Get the weld width; Determine the relationship between the weld width and a width threshold corresponding to the thickness of the tool holder to obtain a first determination result; If the first judgment result indicates that the weld width is greater than or equal to a width threshold, the weld between the knife holder and the tearing knife is ground.

5. The method according to claim 4, characterized in that The method further comprises: If the first judgment result indicates that the weld width is smaller than the width threshold, a welding abnormality is indicated.

6. The method according to claim 4, characterized in that After grinding the welding portion between the knife holder and the tearing knife, the method further includes: The welding point between the knife holder and the tearing knife is subjected to a cooling treatment, wherein the temperature change rate of the cooling process is less than or equal to the preset change rate, and the cooling time of the cooling process is greater than or equal to the preset time.

7. The method according to claim 1, characterized in that The preset welding temperature threshold is dynamically determined by: Determine basal temperature threshold; The preset welding temperature threshold is determined according to the basic temperature threshold, the thickness of the tool holder, the ambient temperature of the tool holder, and a material correction coefficient.

8. A welding device for a tearing knife, characterized in that: The device comprises: an acquisition unit, configured to acquire the thickness of the tool holder to be welded, the ambient temperature of the environment in which the tool holder is located, and a first heating time for the tool holder; a processing unit, configured to determine a first variation curve of internal temperature versus heating time based on a thickness of the knife holder and an ambient temperature of the knife holder; and determine a first internal temperature corresponding to the first heating time based on the first variation curve; A welding unit is used to weld the tearing knife and the knife holder when the minimum value of the first internal temperature and the first external temperature is greater than or equal to a preset welding temperature threshold, wherein the first external temperature is the surface temperature of the knife holder.

9. A computing device, characterized in that including memory and processor; One or more computer programs are stored in the memory, and the one or more computer programs include instructions; when the instructions are executed by the processor, the computing device executes the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium is used to store a computer program, and the computer program is used to execute the method according to any one of claims 1 to 7.

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