A high-frequency welding simulation experiment device and method for extrusion molding

Abstract

The application provides a high-frequency welding simulation experiment device and method for extrusion forming, which comprises an extrusion device, a clamping device, a moving device, an image acquisition device, a temperature measuring instrument, a heating coil and a general control platform. The method is that the clamping device clamps a plate blank; the general control platform adjusts the position of the plate blank according to the image information collected by the image acquisition device; the heating coil heats the plate blank, and the temperature field distribution in the heating stage of the plate blank is collected; the center temperature of the to-be-welded end face is estimated; the weldability of the temperature field of the plate blank is determined; the extrusion device extrudes the plate blank, and outputs the welding process parameters and the temperature field data. The application provides a temperature estimation method for difficult-to-measure temperature points, solves the problem that the temperature of the difficult-to-measure temperature points is not easy to measure, adjusts the process parameters to make the temperature field distribution more uniform, prevents the cold welding or overburning phenomenon, provides a basis for the optimization of the process parameters in the field production, can realize the flexible adjustment of the process parameters, and has the advantages of high experiment efficiency, low cost and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-frequency extrusion welding, in particular, especially relates to a high-frequency welding simulation experiment device and method for extrusion forming. BACKGROUND

[0002] High-frequency extrusion welding has the advantages of fast speed, small heat-affected zone, high weld strength, etc., and is widely used in various metal welding fields, including the automobile, oil well pipe, aircraft and ship industries.

[0003] High-frequency extrusion welding is a process involving the mutual coupling of temperature field, electromagnetic field, velocity field and stress field, and the welding process parameters are not easy to control. The temperature rises rapidly, which can easily produce a large temperature gradient. After cooling, a large residual stress is generated. The excessively high welding temperature during the welding process can cause metal organization oxidation and burning, and insufficient welding temperature can cause cold welding.

[0004] In actual production, high-speed continuous production is usually adopted. It is time-consuming and laborious to adjust appropriate process parameters, the cost is extremely high, and there is a lack of temperature field data as a basis for parameter adjustment. Uneven temperature distribution can easily lead to substandard weld quality.

[0005] The prior art has the technical problem that it is difficult to measure the temperature at hidden positions when collecting temperature, and it is impossible to determine whether the temperature distribution meets the welding requirements. Therefore, it is necessary to provide a simulation experiment device and method to solve the above problems. SUMMARY

[0006] In view of the problems existing in the prior art, the present application provides a device and method for high-frequency welding experiment for extrusion forming. The image acquisition device is used to acquire image information, and the clamping device is used to automatically adjust the position of the plate blank. The temperature measuring instrument and the image acquisition device are used to obtain the temperature field distribution of the plate blank during induction heating. A temperature estimation method for difficult-to-measure temperature points is proposed to solve the problem of difficult-to-measure temperature points. The welding process parameters are quickly and flexibly adjusted to prevent cold welding or burning.

[0007] The technical means adopted by the present application are as follows:

[0008] A high-frequency welding simulation experiment device for extrusion forming, comprising:

[0009] An extrusion device for providing extrusion force for the plate blank extrusion forming process, comprising a first motor, a reducer and a bidirectional screw rod guide rail mechanism; the first motor is connected with the input end of the reducer, and the output end of the reducer is connected with the input end of the bidirectional screw rod guide rail mechanism;

[0010] Clamping device for clamping plate blank, so that the plate blank remains stable during welding, comprising a first clamping table and a second clamping table symmetrically installed on a bidirectional screw rod guide rail mechanism, and a fixed table fixed at a middle position of the bidirectional screw rod guide rail mechanism, wherein the clamping table is provided with horizontal clamping mechanism and vertical clamping mechanism, and the fixed table is provided with welding end clamping mechanism.

[0011] The bidirectional screw rod guide rail mechanism drives the first clamping table and the second clamping table to move simultaneously in the y-axis direction towards or away from each other, thereby completing high-frequency welding of the extruded profile.

[0012] Further, the upper and lower plates of the first clamping table are each provided with one vertical clamping mechanism, and the two side plates of the first clamping table are each provided with one horizontal clamping mechanism, wherein the vertical clamping mechanism and the horizontal clamping mechanism are installed at the same position on the second clamping table and the first clamping table, and the two side plates of the fixed table are each symmetrically provided with two welding end clamping mechanisms; the first clamping table and the second clamping table are each further provided with a positioning baffle.

[0013] Further, the vertical clamping mechanism comprises a fixed plate I, a hydraulic cylinder I, a push rod I and a clamping plate, wherein one end of the hydraulic cylinder I is installed on the fixed plate I, the other end is in sliding connection with the push rod I, and the clamping plate is connected with the telescopic end of the push rod I; the horizontal clamping mechanism has the same structure as the vertical clamping mechanism.

[0014] The welding end clamping mechanism comprises a fixed plate II, a hydraulic cylinder II, a push rod II, a cylindrical roller frame and a plurality of cylindrical rollers, wherein one end of the hydraulic cylinder II is installed on the fixed plate II, the other end is in sliding connection with the push rod II, the cylindrical roller frame is connected with the telescopic end of the push rod II, the plurality of cylindrical rollers are arranged and installed on the cylindrical roller frame through bearings, and the cylindrical rollers can rotate around the axis.

[0015] Further, a moving device is further included, which is installed below the extruding device through a sliding table, and is used to realize overall movement of the extruding device and the clamping device, and comprises a second motor, a unidirectional screw rod guide rail mechanism and a sliding table, wherein the sliding table is installed on the first screw rod guide rail mechanism, and the output end of the second motor is connected with the input end of the unidirectional screw rod guide rail mechanism.

[0016] Further, the image acquisition device, the temperature measuring instrument, the heating coil and the general control console are further included, the image acquisition device is symmetrically installed on the bottom plate of the fixing table, the front end of the image acquisition device can swing up and down and left and right, the temperature measuring instrument is installed on the image acquisition device and used for collecting the temperature of the butt joint of the slab, the slab passes through the heating coil, and the general control console is wirelessly connected with the first motor, the second motor, the hydraulic cylinder I of the vertical / horizontal clamping mechanism, the hydraulic cylinder II of the welding end clamping mechanism, the temperature measuring instrument and the image acquisition device.

[0017] Further, the surface of the cylindrical roller is provided with a heat insulation coating.

[0018] Further, the bottom of the heating coil is provided with a ceramic heat insulation layer to prevent molten metal droplets from falling and damaging the heating coil.

[0019] The application further discloses a high-frequency welding simulation experiment method for extrusion forming.

[0020] S1, clamping the slab: inputting the size of the slab into the general control console, and the general control console controls each horizontal clamping mechanism and vertical clamping mechanism to clamp two slabs, and one end of the slab is in contact with the positioning baffle;

[0021] S2, adjusting the position of the slab: the general control console judges and adjusts the position of the slab according to the image information of the to-be-welded end face of the slab and the relative position of the slab and the heating coil collected by the image acquisition device;

[0022] S3, collecting the temperature field distribution of the slab in the heating stage: the heating coil heats the slab, and the temperature field distribution of the slab in the heating stage is collected; specifically, the heating coil passes through a high-frequency current with a current size I and a current frequency f to heat the butt joint of the slab, the temperature field distribution of the slab in the induction heating stage is collected by the temperature measuring instrument, the Curie temperature of the slab is Ta, the minimum welding temperature is Tb, and the maximum welding temperature is Tc, the reasonable temperature interval (Ta, Tb) of each vertex of the to-be-welded end face is set for t1 seconds, the area higher than the minimum welding temperature Tb is set as the basic welding area, the width b of the center line in the basic welding area of the slab side face at each moment is collected, the minimum welding width is set as b0, the temperatures of each vertex of the to-be-welded end face are T1, T2, T3 and T4, the temperatures of the midpoints of the two sides of the to-be-welded end face are T5 and T6, the center temperature of the to-be-welded end face is T0, and the average value of each vertex temperature is calculated as The average value of the midpoint temperatures of the two sides is calculated as

[0023] S4, estimating the center temperature of the to-be-welded end face: estimating the center temperature T0 of the to-be-welded end face of the slab at each time according to the finite element simulation temperature field, assuming that the center temperature of the to-be-welded end face of the finite element simulation temperature field at each time is T0', the midpoint temperature of the two sides of the to-be-welded end face is T5' and T6', and the average value of the midpoint temperature of the two sides is According to the relationship The center temperature T0 of the to-be-welded end face at each time is estimated;

[0024] S5, slab temperature field weldability determination; in order to ensure the uniformity and heating efficiency of the temperature field at the same time, the value of the heating t1 seconds is compared with the set reasonable temperature interval (Ta, Tb), when , increase the current I; when , the current I remains unchanged; when , reduce the current I;

[0025] Continue heating;

[0026] When , compare the width b of the middle line of the basic welding area with the minimum welding width b0, and compare the center temperature T0 of the to-be-welded end face with the minimum welding temperature Tb, when T0 < Tb, b < b0, reduce the gap d of the slab weld; when T0 ≥ Tb, b < b0, reduce the current frequency f; when T0 ≥ Tb, b ≥ b0, start extrusion;

[0027] When , increase the gap d of the slab weld, assuming that t2 seconds are passed, the minimum temperature rise is △Tmin, Temperature rise change When , continue to increase the gap d of the slab weld, when , it can be considered that the temperature is no longer rising, and the heating coil no longer heats the butt joint of the slab. Due to heat conduction, The temperature gradually decreases to Tc;

[0028] S6, extruding the slab by the extrusion device: the general control console controls the extrusion device to extrude the slab, stops extruding when the set extrusion value is reached, and records and outputs the welding process parameters such as the current frequency f, the current size I, the weld gap d, and the temperature field data at each time.

[0029] ​Further, in the step S2, firstly, it is judged whether the two slab to-be-welded end faces are aligned, if not, the general control platform continues to control each horizontal clamping mechanism and vertical clamping mechanism to adjust the relative position of the two slabs in the x, z direction, so that the to-be-welded end faces are aligned; if aligned, it is further judged whether the vertical distance L1 and L2 of the slabs to the inside of the heating coil are equal, if not, each horizontal clamping mechanism is controlled to adjust the position of the two slabs in the x direction, so that L1=L2; it is judged whether the distance L3 and L4 of the to-be-welded end faces of the slabs to the two end faces of the heating coil are equal, if not, the second motor of the moving device is controlled to adjust the position of the two slabs in the y direction, so that L3=L4; the first motor of the extrusion device is controlled by the general control platform to drive the first clamping table and the second clamping table to move so that the slab weld gap is d, and after the position adjustment is completed, the cylindrical rollers of each welding end clamping mechanism are in contact with the slabs.

[0030] Further, in the step S2, when the position of the slabs in the x direction is adjusted, the vertical clamping mechanism is separated from the slabs; when the position of the slabs in the z direction is adjusted, the horizontal clamping mechanism is separated from the slabs.

[0031] Compared with the prior art, the present application has the following advantages:

[0032] The present application can flexibly adjust the welding process parameters, collect the slab and heating coil images through the image acquisition device, control the clamping device to automatically adjust the position of the slabs after the general control platform analyzes the image information, can realize the movement of the slabs in the x, y, z directions, and the welding end clamping mechanism can ensure the stability of the slabs during the extrusion process.

[0033] The present application can obtain the temperature field distribution of the slabs by the temperature measuring instrument and the image acquisition device, adjust the current size of the induction heating coil, so that the temperature rise rate of the slabs reaches a reasonable range, while ensuring the uniformity of the temperature field and the heating efficiency; when the local temperature reaches the overburning temperature, the weld gap is increased, the slabs are separated from the heating coil, the heat in the high temperature area is mainly transferred to the inside through heat conduction, so that the temperature distribution is more uniform, and the cold welding or overburning phenomenon is prevented.

[0034] The present application compares the temperature field collected by the acquisition device with the finite element simulation temperature field, proposes a temperature estimation method for difficult-to-measure temperature points, and solves the problem that the temperature of the difficult-to-measure temperature points is not easy to measure.

[0035] The present application can output the process parameters such as the current size, current frequency, weld gap and temperature field data during the heating process, and provide a basis for optimizing the process parameters on site.

[0036] In conclusion, the temperature estimation method for difficult-to-measure temperature points is provided, and the problem that the temperature of the difficult-to-measure temperature points is not easy to measure is solved; the process parameters are adjusted to make the temperature field distribution more uniform, prevent the cold welding or overburning phenomenon, provide the basis for the on-site production process parameter optimization, realize the flexible adjustment of the process parameters, and have the advantages of high experimental efficiency, low cost and the like.

[0037] Based on the above reasons, the present application can be widely popularized in the field of high-frequency extrusion welding. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0039] Figure 1 It is a schematic diagram of the overall structure of the device of the present application;

[0040] Figure 2 It is a schematic diagram of the clamping device structure of the device of the present application;

[0041] Figure 3 It is a schematic diagram of the horizontal clamping mechanism and the vertical clamping mechanism of the device of the present application;

[0042] Figure 4 It is a schematic diagram of the welding end clamping mechanism of the device of the present application;

[0043] Figure 5 It is a schematic diagram of the relative position of the slab and the heating coil of the device of the present application;

[0044] Figure 6 It is a schematic diagram of the basic welding area and the weld gap of the slab of the device of the present application;

[0045] Figure 7 It is a schematic diagram of the temperature measurement point of the slab to be welded end face of the device of the present application;

[0046] Figure 8 It is a schematic diagram of the temperature field distribution of the slab to be welded end face of the device of the present application;

[0047] Figure 9 It is an implementation flowchart of the method of the present application;

[0048] In the figure: 1, general console; 2, clamping device; 201, first vertical clamping mechanism; 2011, clamping plate; 2012, push rod I; 2013, hydraulic cylinder I; 2014, fixed plate I; 202, first clamping table; 203, first horizontal clamping mechanism; 204, first welding end clamping mechanism; 2041, cylindrical roller; 2042, cylindrical roller frame; 2043, push rod II; 2044, hydraulic cylinder II; 2045, fixed plate II; 205, fixed table; 206, second welding end clamping mechanism; 207, second vertical clamping mechanism; 208, second clamping table; 209, second horizontal clamping mechanism; 210, first positioning baffle; 211, third vertical clamping mechanism; 212, third horizontal clamping mechanism; 213, third welding end clamping mechanism; 214, fourth welding end clamping mechanism; 215, fourth vertical clamping mechanism; 216, fourth horizontal clamping mechanism; 217, second positioning baffle; 3, slab I; 4, slab II; 5, heating coil; 6, temperature measuring instrument; 7, image acquisition device; 8, extrusion device; 81, first motor; 82, speed reducer; 83, bidirectional screw guide rail mechanism; 9, moving device; 91, second motor; 92, unidirectional screw guide rail mechanism; 93, sliding table. DETAILED DESCRIPTION

[0049] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0050] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment below is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0051] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0052] The foregoing description, for purposes of clarity, describes the present application in terms of its components, processes and methods. It is to be understood that the terminology used, and descriptive contexts are used for purposes of readability only and should not be construed as limiting. Likewise, no portion of the disclosure for any single aspect or embodiment presented herein should be construed as limiting and it is recognized that alternative aspects and embodiments can be developed that incorporate one or more aspects of the present application. The description is presented in the order of described aspects appearing in the Examples, which are presented in no particular order. Moreover, multiple instances of a process, method, state, composition or element can be present in a single embodiment, and each instance can be formulated independently of the others. Each component, process, method, composition or element can be used in any combination with any other component, process, method, composition or element disclosed herein. The present application is well adapted to carry out the objects and attain the ends and advantages mentioned above as well as those inherent therein. While the application has been depicted, described and is defined by reference to exemplary embodiments, such references do not imply a limitation on the scope of the application, and no such limitation is to be inferred. The disclosure provided herein can be implemented in the form of control logic using hardware or a combination of hardware and software in a modular or integrated manner. As used herein, a software module is generally defined as a computer program or set of computer executable instructions that is designed or configured to perform a particular task, or implement a particular abstract data type. The software module can be implemented in a variety of ways, including but not limited to a subroutine, a function, a procedure, an object, an object class, an instance of an object class, or any combination of these. The software module can be executed on a single computer or distributed across multiple computers. The software module can be written in a compiled or interpreted computer language. The software module can be stored in a computer readable storage medium, which can be any available media that can be accessed by a computer. By way of example, and not limitation, such computer readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired computer program code in the form of computer-executable instructions or data structures and that can be accessed by a computer. When information is transferred or provided over a network or another communications connection (either hardwired, wireless, or a combination of hardwired or wireless) to a computer, the computer properly views the connection as a computer-readable medium. Be default, the

[0053] In the description of the present application, it is to be understood that the orientation or positional relationships indicated by orientation words such as "front, back, upper, lower, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Without the opposite indication, these orientation words do not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the scope of the present application. The orientation words "inner, outer" refer to the inner and outer relative to the contour of each component itself.

[0054] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial positional relationship of one device or feature with respect to other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device as described in the drawings. For example, if the device in the drawings is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0055] As Figure 1As shown, the present application provides a high-frequency welding simulation experiment device for extrusion forming, which can perform high-frequency extrusion welding on a slab, and comprises a general control console 1, a clamping device 2 for clamping the slab, an extrusion device 8 for providing extrusion pressure for the slab extrusion forming process, a heating coil 5, a temperature measuring instrument 6, an image acquisition device 7, and a moving device 9 for realizing the overall movement of the extrusion device 8 and the clamping device 2.

[0056] In this embodiment, the extrusion device 8 comprises a first motor 81, a speed reducer 82, and a bidirectional screw rod guide rail mechanism 83; the first motor 81 is connected with the input end of the speed reducer 82, and the output end of the speed reducer 82 is connected with the input end of the bidirectional screw rod guide rail mechanism 83.

[0057] In this embodiment, the speed reducer 82 adopts a worm and gear speed reducer with a speed ratio of 50, which has a self-locking effect and prevents damage to the first motor 81 during the extrusion process.

[0058] In this embodiment, as shown, Figure 2 The clamping device 2 keeps the slab stable during the welding process, which comprises a first clamping table 202, a second clamping table 208, a fixed table 205, four horizontal clamping mechanisms, four vertical clamping mechanisms, four welding end clamping mechanisms, and a positioning baffle, the fixed table 205 is fixed at the middle position of the bidirectional screw rod guide rail mechanism 83, the first clamping table 202 and the second clamping table 208 are symmetrically installed on the bidirectional screw rod guide rail mechanism 83, and the bidirectional screw rod guide rail mechanism 83 can drive the first clamping table 202 and the second clamping table 208 to move simultaneously in the same direction or in opposite directions along the y-axis direction.

[0059] The upper plate of the first clamping table 202 is installed with a first vertical clamping mechanism 201, and the lower plate is installed with a fourth vertical clamping mechanism 215; the two side plates of the first clamping table 202 are respectively installed with a first horizontal clamping mechanism 203 and a fourth horizontal clamping mechanism 216; the same positions of the second clamping table 208 and the first clamping table 202 are respectively installed with a second vertical clamping mechanism 207, a third vertical clamping mechanism 211, a second horizontal clamping mechanism 209, and a third horizontal clamping mechanism 212.

[0060] As shown, Figure 3 Taking a vertical clamping mechanism as an example, it comprises a fixed plate I 2014, a hydraulic cylinder I 2013, a push rod I 2012, and a clamping plate 2011; one end of the hydraulic cylinder I 2013 is installed on the fixed plate I 2014, and the other end is slidably connected with the push rod I 2012; the clamping plate 2011 is connected with the telescopic end of the push rod I 2012; the horizontal clamping mechanism and the vertical clamping mechanism have the same structure, and are arranged in the horizontal direction.

[0061] Two welding end clamping mechanisms are symmetrically installed on each side plate of the fixed platform 205, namely, the first welding end clamping mechanism 204 and the fourth welding end clamping mechanism 214 are opposite each other, and the second welding end clamping mechanism 206 and the third welding end clamping mechanism 213 are opposite each other.

[0062] like Figure 4 As shown, the welding end clamping mechanism includes a fixed plate II 2045, a hydraulic cylinder II 2044, a push rod II 2043, a cylindrical roller frame 2042, and multiple cylindrical rollers 2041. One end of the hydraulic cylinder II 2044 is mounted on the fixed plate II 2045, and the other end is slidably connected to the push rod II 2043. The cylindrical roller frame 2042 is connected to the telescopic end of the push rod II 2043. Multiple cylindrical rollers 2041 (three are shown as an example in the figure) are arranged and mounted on the cylindrical roller frame 2042 via bearings. Each cylindrical roller 2041 can rotate around its axis. In this embodiment, the surface of the cylindrical rollers 2041 has a heat-insulating coating.

[0063] There are two positioning baffles: a second positioning baffle 217 installed on the first clamping table 202 and a first positioning baffle 210 installed on the second clamping table 208.

[0064] In this embodiment, the slab is two rectangular steel plates of the same size, namely slab I3 and slab II4; when clamped by clamping device 2, its upper and lower surfaces are in contact with cylindrical roller 2041, and its two sides are in contact with clamping plate 2011. The thickness range of the weldable slab is 2mm to 20mm.

[0065] In an example of the present invention, a high-frequency welding simulation experimental device for extrusion molding is provided, which further includes a moving device 9, which is installed below the extrusion device 8 via a slide table 93. The device includes a second motor 91, a one-way lead screw guide mechanism 92, and a slide table 93. The slide table 93 is installed on the one-way lead screw guide mechanism 92, and the output end of the second motor 91 is connected to the input end of the one-way lead screw guide mechanism 92.

[0066] In this embodiment, four image acquisition devices 7 are symmetrically installed on the base plate of the fixed platform 205. The front end of each image acquisition device 7 can swing up, down, left, and right. The thermometer 6 is installed on the image acquisition device 7 and is used to collect the temperature at the joint of the slab. The slab passes through the heating coil 5. The main control console 1 is wirelessly connected to the first motor 81, the second motor 91, the hydraulic cylinder I in the clamping mechanism, the hydraulic cylinder II in the welding end clamping mechanism, the thermometer 6, and the image acquisition devices 7. The bottom of the heating coil 5 is provided with a ceramic heat insulation layer to prevent molten metal dripping and damaging the heating coil 5. Cooling water is circulated inside the heating coil 5 to maintain a constant temperature.

[0067] Based on the high-frequency welding simulation experimental apparatus for extrusion molding provided by this invention, this invention also provides a high-frequency welding simulation experimental method for extrusion molding, such as... Figure 9 As shown, the specific implementation steps are as follows:

[0068] S1. Clamping the slab: Input the slab dimensions into the main control panel 1. The main control panel 1 controls each horizontal clamping mechanism and vertical clamping mechanism to clamp the two slabs together, with one end of the slab in contact with the positioning baffle.

[0069] S2. Adjusting the slab position: The main control console 1 acquires image information of the slab's end face to be welded and the relative position image information of the slab and the heating coil through the image acquisition device 7, such as... Figure 5 and Figure 6 As shown, firstly, it is determined whether the two slabs to be welded end faces are aligned. If they are not aligned, the main control console 1 continues to control each horizontal clamping mechanism and vertical clamping mechanism to adjust the relative positions of the two slabs in the x and z directions so that the end faces to be welded are aligned. If they are aligned, it is then determined whether the vertical distances L1 and L2 from the slabs to the inner side of the heating coil 5 are equal. If they are not equal, each horizontal clamping mechanism is controlled to adjust the position of the two slabs in the x direction so that L1 = L2. It is then determined whether the distances L3 and L4 from the welding end face of the slabs to the two end faces of the heating coil 5 are equal. If they are not equal, the second motor 91 of the moving device 9 is controlled to adjust the position of the two slabs in the y direction so that L3 = L4. The main control console 1 controls the first motor 81 of the extrusion device 8 to drive the first clamping table 202 and the second clamping table 208 to move so that the weld gap of the slabs is d. After the position adjustment is completed, the cylindrical rollers of each welding end clamping mechanism contact the slabs.

[0070] S3. Acquiring the temperature field distribution during the slab heating stage: A high-frequency current of magnitude I and frequency f is passed through heating coil 5 to heat the butt joint of the slab. A thermometer collects the temperature field distribution of the slab during the induction heating stage. Let the Curie temperature of the slab be Ta, the minimum welding temperature be Tb, and the maximum welding temperature be Tc. Let the reasonable temperature range (Ta, Tb) of each vertex of the end face to be welded be defined after heating for t1 seconds. Let the area above the minimum welding temperature Tb be the basic welding area. The width of the center of the basic welding area on the side of the slab at each moment is b. Figure 6 As shown, the minimum welding width is set to b0, the temperatures of each vertex of the end face to be welded are T1, T2, T3, and T4, the temperatures of the midpoints of the two sides of the end face to be welded are T5 and T6, and the center temperature of the end face to be welded is T0. Figure 7 As shown, the average temperature of each vertex is calculated as follows: Calculate the average temperature at the midpoint of both sides.

[0071] In this embodiment, the Curie temperature Ta of the slab is 760 °C, the minimum welding temperature Tb is 1300 °C, the maximum welding temperature Tc is 1550 °C, the minimum welding width b0 is taken as 0.3 mm, and the t1 value is taken as 1.5 seconds;

[0072] S4. Estimate the center temperature of the to-be-welded end face: Use the simulation software ansys to perform magneto-thermal bidirectional coupling simulation on the slab, and estimate the center temperature T0 of the to-be-welded end face at each moment of the to-be-welded end face of the slab according to the finite element simulation of the temperature field. Let the center temperature of the to-be-welded end face of the finite element simulation temperature field at each moment be T0’, and the temperatures at the midpoints of the two sides of the to-be-welded end face be T5’ and T6’. The average value of the temperatures at the midpoints of the two sides is As Figure 8 shown, in the experiment, the difference △ between the center temperature of the to-be-welded end face of the temperature field and the average value of the temperatures at the midpoints of the two sides When heating for the same time, the average value of the temperatures at the midpoints of the two sides measured in the experiment and the average value of the temperatures at the midpoints of the two sides simulated by the simulation differ by 40 °C, and the final temperature at the midpoints of the two sides can reach about 1500 degrees Celsius. Therefore, this error can be ignored, and it can be considered that △T’ = △T, obtaining the relationship Estimate the center temperature T0 of the to-be-welded end face at each moment;

[0073] S5. Judgment on the weldability of the slab temperature field:

[0074] In order to ensure both the temperature field uniformity and the heating efficiency, compare the value at the time of heating for t1 seconds with the set reasonable temperature range (Ta, Tb). When increase the current I;

[0075] When keep the current I unchanged; when decrease the current I;

[0076] Continue heating;

[0077] When compare the width b at the midline of the basic welding area with the minimum welding width b0, and compare the center temperature T0 of the to-be-welded end face with the minimum welding temperature Tb. When T0 < Tb and b < b0, reduce the weld gap d of the slab; when T0 ≥ Tb and b < b0, reduce the current frequency f; when T0 ≥ Tb and b ≥ b0, start extrusion;

[0078] When increase the weld gap d of the slab. Assume that after t2 seconds, the minimum temperature rise is △Tmin, Temperature rise change When the slab weld gap d is continuously increased, when the temperature is considered to no longer rise, the heating coil no longer heats the butt joint of the slab, and due to heat conduction, the temperature gradually decreases to Tc;

[0079] In this embodiment, t2 takes 2 seconds, and △Tmin takes 20℃;

[0080] S6, the extrusion device 8 extrudes the slab: the general control platform 1 controls the extrusion device to extrude the slab, stops extruding when the set extrusion value is reached, and the general control platform 1 records and outputs the welding process parameters such as current frequency f, current size I, weld gap d and temperature field data at each time;

[0081] In this embodiment, when adjusting the position of the slab in the x direction in step S2, the vertical clamping mechanism is separated from the slab; when adjusting the position of the slab in the z direction, the horizontal clamping mechanism is separated from the slab;

[0082] In the examples of the present application, the welding process parameters can be flexibly adjusted, the image acquisition device 7 acquires the image of the slab and the heating coil, the general control platform 1 analyzes the image information and controls the clamping device 2 to automatically adjust the position of the slab, which can realize the movement of the slab in the x, y and z directions, and the welding end clamping mechanism can ensure the stability of the slab during the extrusion process.

[0083] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A high-frequency welding simulation experimental device for extrusion molding, characterized in that, include: An extrusion device for providing extrusion force for slab extrusion forming process includes a first motor, a reducer, and a bidirectional lead screw guide mechanism; the first motor is connected to the input end of the reducer, and the output end of the reducer is connected to the input end of the bidirectional lead screw guide mechanism; A clamping device for clamping a slab to keep it stable during welding includes a first clamping platform and a second clamping platform symmetrically mounted on the bidirectional screw guide mechanism, and a fixed platform fixed at the middle position of the bidirectional screw guide mechanism. The clamping platform is provided with a horizontal clamping mechanism and a vertical clamping mechanism, and the fixed platform is provided with a welding end clamping mechanism. The bidirectional lead screw guide mechanism drives the first clamping table and the second clamping table to move simultaneously in opposite directions along the y-axis to complete the high-frequency welding of the extrusion forming. Each of the upper and lower plates of the first clamping table is equipped with a vertical clamping mechanism, and each of the two side plates of the first clamping table is equipped with a horizontal clamping mechanism. The vertical clamping mechanism and the horizontal clamping mechanism are installed in the same position on the second clamping table and the first clamping table. Two welding end clamping mechanisms are symmetrically installed on each of the two side plates of the fixing table. Positioning baffles are also installed on the first clamping table and the second clamping table respectively. It also includes an image acquisition device, a thermometer, and a heating coil. The image acquisition device is symmetrically mounted on the fixed platform base plate. The front end of the image acquisition device can swing up, down, left, and right. The thermometer is mounted on the image acquisition device and is used to collect the temperature at the joint of the slab. The slab passes through the heating coil.

2. The high-frequency welding simulation experimental apparatus for extrusion molding according to claim 1, characterized in that, The vertical clamping mechanism includes a fixed plate I, a hydraulic cylinder I, a push rod I, and a clamping plate. One end of the hydraulic cylinder I is mounted on the fixed plate I, and the other end is slidably connected to the push rod I. The clamping plate is connected to the telescopic end of the push rod I. The horizontal clamping mechanism has the same structure as the vertical clamping mechanism. The welding end clamping mechanism includes a fixed plate II, a hydraulic cylinder II, a push rod II, a cylindrical roller frame, and multiple cylindrical rollers. One end of the hydraulic cylinder II is mounted on the fixed plate II, and the other end is slidably connected to the push rod II. The cylindrical roller frame is connected to the telescopic end of the push rod II. There are multiple cylindrical rollers, which are arranged and mounted on the cylindrical roller frame through bearings. The cylindrical rollers can rotate around an axis.

3. The high-frequency welding simulation experimental apparatus for extrusion molding according to claim 2, characterized in that, It also includes a moving device, which is mounted below the extrusion device via a slide table, for realizing the overall movement of the extrusion device and the clamping device. The device includes a second motor, a one-way lead screw guide mechanism, and a slide table. The slide table is mounted on the one-way lead screw guide mechanism, and the output end of the second motor is connected to the input end of the one-way lead screw guide mechanism.

4. The high-frequency welding simulation experimental apparatus for extrusion molding according to claim 3, characterized in that, It also includes a central control console, which is wirelessly connected to the first motor, the second motor, the hydraulic cylinder I of the vertical clamping mechanism, the hydraulic cylinder I of the horizontal clamping mechanism, the hydraulic cylinder II of the welding end clamping mechanism, a thermometer, and an image acquisition device.

5. The high-frequency welding simulation experimental apparatus for extrusion molding according to claim 4, characterized in that, The cylindrical roller has a heat-insulating coating on its surface.

6. The high-frequency welding simulation experimental apparatus for extrusion molding according to claim 5, characterized in that, A ceramic heat insulation layer is provided at the bottom of the heating coil to prevent molten metal dripping and damaging the heating coil.

7. A high-frequency welding simulation experimental method for extrusion molding, characterized in that, The simulation experimental apparatus described in any one of claims 4-6 includes the following steps: S1. Clamping the slab: Input the slab dimensions into the main control panel. The main control panel controls each horizontal clamping mechanism and vertical clamping mechanism to clamp the two slabs together. One end of the slab contacts the positioning baffle. S2. Adjusting the slab position: The main control console uses the image information of the slab end face to be welded and the image information of the relative position of the slab and the heating coil to collect the image information of the slab end face to be welded and the image information of the relative position of the slab and the heating coil to judge and adjust the slab position. S3. Acquire temperature field distribution during slab heating stage: The heating coil heats the slab, and the temperature field distribution during the slab heating stage is acquired. S4. Estimate the center temperature of the end face to be welded: Estimate the center temperature of the end face to be welded and the midpoint temperature of both sides of the slab at each time based on the finite element simulation temperature field, and estimate the center temperature of the end face to be welded at each time based on the relationship. S5. Determination of weldability of slab temperature field; S6. Extrusion device extrudes slab: The extrusion device extrudes slab and outputs welding process parameters and temperature field data.

8. The high-frequency welding simulation experimental method for extrusion molding according to claim 7, characterized in that, In step S2, it is first determined whether the two slabs to be welded end faces are aligned. If they are not aligned, the main control console continues to control each horizontal clamping mechanism and vertical clamping mechanism to adjust the relative positions of the two slabs in the x and z directions so that the end faces to be welded are aligned. If they are aligned, it is then determined whether the vertical distances L1 and L2 from the slabs to the inner side of the heating coil are equal. If they are not equal, each horizontal clamping mechanism is controlled to adjust the position of the two slabs in the x direction so that L1 = L2. It is then determined whether the distances L3 and L4 from the welding end face of the slabs to the two end faces of the heating coil are equal. If they are not equal, the second motor of the moving device is controlled to adjust the position of the two slabs in the y direction so that L3 = L4. The main control console controls the first motor of the extrusion device, which drives the first clamping table and the second clamping table to move so that the gap between the weld seams of the slab is d. After the position is adjusted, the cylindrical rollers of the clamping mechanism at each welding end contact the slab.

9. The high-frequency welding simulation experimental method for extrusion molding according to claim 8, characterized in that, In step S2, when adjusting the position of the slab in the x direction, the vertical clamping mechanism separates from the slab; when adjusting the position of the slab in the z direction, the horizontal clamping mechanism separates from the slab.

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