Weldment control system for inertia friction welding

Abstract

The invention provides a weldment control system for inertia friction welding, and relates to the field of solid-phase welding, and the system is realized by the following steps: step 1, uniformly pre-installing hydraulic oil cylinders on a movable sliding table of inertia friction welding equipment; secondly, after the large-length-diameter-ratio pipe type / shaft type component is installed into a welding tool, pre-clamping is conducted; thirdly, a base body of the laser range finder is fixedly installed on inertia friction welding equipment and aligned; 4, adjusting the pressure value of the hydraulic oil cylinder in real time by using a hydraulic oil cylinder control algorithm according to a preset acquisition time interval; fifthly, the inertia friction welding equipment automatically completes automatic welding of the workpiece to be welded; and sixthly, unloading is conducted after welding. The system can effectively solve the problem that in the inertia friction welding process of large-length-diameter-ratio pipe / shaft components, the radial run-out value of a welded workpiece is difficult to test manually, and the friction welding precision and quality of the components are ensured.

Description

[0001] The application is a divisional application of patent application number 2022113235828, entitled "Inertial friction welding large length-diameter ratio shaft / tube type component clamping precision control method". TECHNICAL FIELD

[0002] The application relates to the technical field of solid-phase welding, and particularly relates to a welding piece control system for inertial friction welding. BACKGROUND

[0003] As an important branch of friction welding, the core principle of inertial friction welding is to use the inertial kinetic energy stored in the flywheel to generate heat through the relative friction between the workpieces, so that the metal on the contact surface reaches a plastic state, and then the inertial pressure is used to complete the solid-state connection process of forging and welding. Inertial friction welding is a high-efficiency and high-quality solid-state welding technology, and its energy source is the rotational inertia of the flywheel. During the welding process, the torque and rotational speed gradually decrease with the consumption of inertia, and it belongs to the "energy controllable" welding technology. At present, inertial friction welding is widely used in the fields of machine manufacturing, petroleum and chemical industry, automobile manufacturing, light industry and textile industry, etc. In the inertial friction welding process, the pre-welding clamping precision of the workpieces to be welded has a significant impact on the welding quality: if the coaxiality of the two workpieces to be welded after clamping is poor, it will not only affect the precision of the welded joint and cause welding misalignment, but also cause uneven friction heat at the welding interface, thereby reducing the joint strength. At the same time, in the fields of large-scale mechanical equipment and petroleum and chemical industry, a large number of pipe / tube parts with large length-diameter ratio are used. After the pipe / tube parts with large length-diameter ratio are clamped by the inertial friction welding tooling, firstly, due to the large length of the pipe / tube parts, and secondly, due to the machining precision error of the welding tooling, long-term use causes tooling wear or deformation, etc., the pipe / tube parts exhibit the problem of large radial runout after clamping. Especially due to the limitations of the structure or clamping method of the inertial friction welding equipment, the length of the clamped cantilever is increased, causing the radial runout at the welding interface to increase by multiple, further affecting the welding quality and connection strength of the welded joint (i.e. poor welding quality and low connection strength, which cannot meet the needs of mechanical equipment or petroleum and chemical industry). In addition, due to the process characteristics of inertial friction welding (i.e. the workpiece to be welded on the moving slide does not rotate, but only relies on the rotational friction heat generated by the inertial kinetic energy stored in the flywheel), it is difficult to use a dial gauge or other measuring tools to measure the radial runout value of the clamped workpiece to be welded, further affecting the welding precision and strength of the workpiece to be welded. SUMMARY

[0004] In view of the problems existing in the prior art, the present application aims to provide a welding piece control system for inertia friction welding, which can effectively solve the problem that it is difficult for workers to test the radial run-out value of the welding workpiece during the inertia friction welding process of a large-length-diameter-ratio pipe / axle component, thereby avoiding problems such as poor coaxiality of the workpiece after welding, uneven weld structure performance, poor welding quality, poor welding piece connection strength and the like caused by large radial run-out of the welding piece during the welding process, and ensuring the welding precision and quality of the large-length-diameter-ratio pipe / axle component.

[0005] The object of the present application is achieved by the following technical solutions. A welding piece control system for inertia friction welding is achieved by the following steps: Step 1: uniformly pre-installing a plurality of hydraulic cylinders on a moving slide table of an inertia friction welding device for adjusting and controlling the radial run-out value of a workpiece to be welded; Step 2: after a large-length-diameter-ratio pipe / axle component is loaded into a welding tool, pre-clamping is performed; Step 3: a seat body of a laser range finder is fixedly installed on the inertia friction welding device, and the emission end of the laser range finder is located on the upper side of the outer circular surface of the welding interface of the large-length-diameter-ratio pipe / axle component, and the emission end (receiving end) of the laser range finder is perpendicular to the pipe / axle component, for measuring the distance from the laser range finder to the surface of the large-length-diameter-ratio pipe / axle component; Step 4: presetting the laser range finder data collection time interval Δt , collecting data of the laser range finder once every Δt interval, and adjusting the pressure value of the plurality of hydraulic cylinders in real time according to a hydraulic cylinder control algorithm; Step 5: after the pipe / axle component installed in the welding tool is in a reasonable radial run-out range, the inertia friction welding device automatically completes automatic welding of the workpiece to be welded.

[0006] For further optimization, the number of hydraulic cylinders in Step 1 is 3-6; and the pressure range of the hydraulic cylinders is 5-50 kN.

[0007] For further optimization, the outer diameter of the large-length-diameter-ratio pipe / axle component in Step 2 is φ20-180 mm; and the exposed length of the large-length-diameter-ratio pipe / axle component after clamping is 100-400 mm.

[0008] For further optimization, the number of laser range finders in Step 3 is consistent with the number of hydraulic cylinders, and the laser range finders are correspondingly arranged with the hydraulic cylinders; the distance from each laser range finder to the center point of the large-length-diameter-ratio pipe / axle component is consistent; and the laser range finder is located at the end of the welding interface close to the workpiece to be welded clamped by the moving slide table.

[0009] For further optimization, the hydraulic cylinder control algorithm is specifically as follows: first, the distance between the laser range finder and the outer circular surface of the pipe / axle component at the current time is obtained, and the hydraulic cylinder control algorithm is executed once every ΔtThe distance between the laser range finder and the outer surface of the pipe / axle member at the previous moment ; Then, the difference between the distance at the current moment and the distance at the previous moment is obtained ΔL 1:

[0010] Then, the maximum value of the distance between the laser range finder and the outer surface of the pipe / axle member at all recorded moments is obtained L max and the minimum value L min The distance range at all moments is obtained ΔL 2:

[0011] The preset radial run-out threshold value: if the difference ΔL 1 is within the run-out threshold value and the distance range ΔL 2 is within the run-out threshold value, the hydraulic cylinder of the laser range finder is not adjusted; if the difference ΔL 1 or the distance range ΔL 2 at the current moment is outside the run-out threshold value, the hydraulic cylinder pressure value is adjusted to realize the control of the corresponding radial run-out.

[0012] Preferably, the run-out threshold value is 0.08-0.35 mm.

[0013] For further optimization, the hydraulic cylinder pressure value adjustment specifically includes: first, the pressure value applied by the hydraulic cylinder at the previous moment Δt intervening one moment from the current moment is obtained and the pressure value applied at the previous moment Δt intervening two moments from the current moment is obtained The pressure change value at the previous moment is obtained ΔN :

[0014] If , it indicates that the pressure value of the hydraulic cylinder is increased at the previous moment: if the difference ΔL 1 or the distance range ΔL 2 at the current moment is less than the run-out threshold value range, the corresponding hydraulic cylinder of the laser range finder is reduced by one unit of pressure value; if the difference ΔL 1 or the distance range ΔL 2 at the current moment is greater than the run-out threshold value range, since the pressure value of the hydraulic cylinder is increased at the previous moment, considering the adjustment hysteresis, the hydraulic cylinder does not adjust at this moment, and the difference ΔL 1 or the distance range ΔL 2 at the next moment is determined in relation to the run-out threshold value. If , indicates that the pressure value of the hydraulic cylinder is reduced at the previous moment: if the difference ΔL 1 or the distance difference ΔL 2 is less than the fluctuation threshold range at the current moment, the hydraulic cylinder does not adjust at this moment due to the reduction of the pressure value of the hydraulic cylinder at the previous moment, and the difference ΔL 1 or the distance difference ΔL 2 at the next moment is judged in relation to the fluctuation threshold; if the difference ΔL 1 or the distance difference ΔL 2 at the current moment is greater than the fluctuation threshold range, the corresponding hydraulic cylinder of the laser range finder increases by one unit of pressure value; If , indicates that the pressure value of the hydraulic cylinder is not adjusted at the previous moment: if the difference ΔL 1 or the distance difference ΔL 2 at the current moment is less than the fluctuation threshold range, the corresponding hydraulic cylinder of the laser range finder decreases by one unit of pressure value; if the difference ΔL 1 or the distance difference ΔL 2 at the current moment is greater than the fluctuation threshold range, the corresponding hydraulic cylinder of the laser range finder increases by one unit of pressure value.

[0015] The technical effects possessed by the scheme of the present application are as follows: The welding part control system of the present application cooperates with the auxiliary hydraulic cylinder through the laser range finder, monitors and controls the non-rotating pipe / axle member on the moving slide, effectively solves the problem that it is difficult for manual testing to test the radial run-out value of the welded workpiece during the inertia friction welding process of the large-length-diameter-ratio pipe / axle member, thereby ensuring that the coaxiality of the welded workpiece after welding is excellent, the connection strength is high, and the welding quality is good; at the same time, through the monitoring and adjustment of the non-rotating pipe / axle member on the moving slide, the problems of difficult control and many influencing factors caused by heat generated by friction during the adjustment of the rotating workpiece during the welding process are avoided, the real-time and effective control of the radial run-out value of the welding part during the inertia friction welding process is ensured, the errors or safety hazards occurring during the adjustment process are avoided, the coaxiality of the welded workpiece after welding is good, the connection strength of the welded joint is high, the weld structure performance is uniform, and the welding quality is good. In addition, the present application utilizes the difference at the current moment and the distance difference to realize the time period-by-time period evaluation and overall evaluation of the radial run-out value of the welding part, which not only ensures the effectiveness of the monitoring and the real-time of the adjustment, ensures the testing accuracy and reduces the testing error, avoids the serious lag of the adjustment, and ensures that the overall adjustment does not deviate from the target, and realizes the purpose of overall controllability. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structural schematic view of the large-length-diameter-ratio axle / pipe member clamping precision control device in the embodiment of the present application.

[0017] Figure 2 For Figure 1 A local enlarged view of the middle A.

[0018] Figure 3 A cross-sectional view of the hydraulic cylinder of the clamping precision control device for the large-length-diameter-ratio shaft / tube member in the embodiment of the present application.

[0019] Wherein, 10, main shaft box; 11, laser range finder; 20, moving slide; 21, hydraulic cylinder; 30, first welding part; 40, second welding part. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments.

[0021] Embodiment 1: A welding part control system for inertia friction welding, as shown in Figures 1-3 , the system is realized by the following steps: Step one: evenly pre-install three hydraulic cylinders on the moving slide of the inertia friction welding equipment for adjusting and controlling the radial run-out value of the workpiece to be welded; the pressure range of the hydraulic cylinder is 5-50 kN.

[0022] Step two: after the large-length-diameter-ratio tube member is installed in the welding tooling, pre-clamping is performed; the outer diameter of the large-length-diameter-ratio tube member is φ50 mm; the exposed length of the large-length-diameter-ratio tube / axle member after clamping is 100 mm.

[0023] Step three: the seat body of the laser range finder is fixedly installed on the inertia friction welding equipment, and the emission end of the laser range finder is located on the upper side of the outer circular surface of the large-length-diameter-ratio tube member to be welded, and the emission end (receiving end) of the laser range finder is perpendicular to the tube member, for measuring the distance from the laser range finder to the surface of the large-length-diameter-ratio tube member; the number of laser range finders is consistent with the number of hydraulic cylinders (i.e. three), and the laser range finders are correspondingly arranged with the hydraulic cylinders; the distance from each laser range finder to the center point of the large-length-diameter-ratio tube member is consistent; the laser range finder is located at the end of the to-be-welded interface close to the moving slide clamped to-be-welded workpiece.

[0024] Step four: preset the laser range finder collection time interval Δt Δt According to the total time of friction welding, evenly divide it, every Δt laser range finder collects data once, and according to the hydraulic cylinder control algorithm, the pressure value of the plurality of hydraulic cylinders is adjusted in real time; The hydraulic cylinder control algorithm is specifically: first, the distance between the laser range finder and the outer circular surface of the tube member at the current time is obtained ​, interval one Δt laser range finder and the outer surface of the pipe member at the previous moment ; Then, the difference between the distance at the current moment and the distance at the previous moment is obtained ΔL 1:

[0025] Then, the maximum value of the distance between the laser range finder and the outer surface of the pipe member at all recorded moments is obtained L max and the minimum value L min The distance range at all moments is obtained ΔL 2:

[0026] The preset radial run-out threshold value: if the difference ΔL 1 is within the run-out threshold value and the distance range ΔL 2 is within the run-out threshold value, the hydraulic cylinder of the laser range finder does not need to be adjusted; if the difference ΔL 1 or the distance range ΔL 2 at the current moment is outside the run-out threshold value, the pressure value of the hydraulic cylinder is adjusted to control the corresponding radial run-out; the run-out threshold value is 0.08-0.35 mm.

[0027] The adjustment of the pressure value of the hydraulic cylinder is as follows: first, the pressure value applied by the hydraulic cylinder at the previous moment Δt at the current moment is obtained and the pressure value applied at the previous moment Δt at the current moment is obtained , and the pressure change value at the previous moment is obtained ΔN :

[0028] If , it indicates that the pressure value of the hydraulic cylinder is increased at the previous moment: if the difference ΔL 1 or the distance range ΔL 2 at the current moment is less than the run-out threshold value range, the corresponding hydraulic cylinder of the laser range finder is reduced by one unit of pressure value; if the difference ΔL 1 or the distance range ΔL 2 at the current moment is greater than the run-out threshold value range, since the pressure value of the hydraulic cylinder is increased at the previous moment, considering the adjustment hysteresis, the hydraulic cylinder does not need to be adjusted at this moment, and the difference ΔL 1 or the distance range ΔL 2 at the next moment is determined in relation to the run-out threshold value. If , indicates that the pressure value of the hydraulic cylinder is reduced at the previous moment: if the difference ΔL 1 or distance difference ΔL 2 is less than the beat threshold range, because the pressure value of the hydraulic cylinder is reduced at the previous moment, considering the adjustment hysteresis, the hydraulic cylinder does not adjust at this moment, and the difference ΔL 1 or distance difference ΔL 2 of the next moment is determined. ΔL 1 or distance difference ΔL 2 is greater than the beat threshold range, then the hydraulic cylinder corresponding to the laser range finder increases a unit of pressure value. If , indicates that the pressure value of the hydraulic cylinder is not adjusted at the previous moment: if the difference ΔL 1 or distance difference ΔL 2 of the current moment is less than the beat threshold range, then the hydraulic cylinder corresponding to the laser range finder decreases a unit of pressure value; if the difference ΔL 1 or distance difference ΔL 2 of the current moment is greater than the beat threshold range, then the hydraulic cylinder corresponding to the laser range finder increases a unit of pressure value.

[0029] Step five: after the pipe member installed in the welding tool is in a reasonable radial beat range, the inertia friction welding equipment automatically completes the automatic welding of the workpiece to be welded.

[0030] Step six: after the welding is completed, first turn off the laser range finder, then loosen the hydraulic cylinder; then loosen the clamping tool of the first and second welding parts respectively, move the slide table to reset, take down the welded part, and remove the excess welding flash.

[0031] Example 2: A welding part control system for inertia friction welding, as shown in Figures 1-3 , the system is realized by the following steps: Step one: evenly pre-install four hydraulic cylinders on the moving slide table of the inertia friction welding equipment for adjusting and controlling the radial beat value of the workpiece to be welded; the pressure range of the hydraulic cylinder is 5-50 kN.

[0032] Step two: after the long-diameter ratio pipe member is installed in the welding tool, pre-clamp; the outer diameter of the long-diameter ratio pipe member is φ100 mm; the exposed length of the long-diameter ratio pipe member after clamping is 260 mm.

[0033] Step three: fix the seat body of the laser range finder on the inertia friction welding equipment, and ensure that the emission end of the laser range finder is located on the upper side of the outer circular surface of the long-diameter ratio pipe member to be welded, and the emission end (receiving end) of the laser range finder is perpendicular to the pipe member (as Figure 1 ,Figure 2 The laser range finder is used to measure the distance from the laser range finder to the surface of the large-length-diameter-ratio tubular member (as shown), the number of laser range finders is consistent with the number of hydraulic cylinders (i.e., four), and the laser range finders are arranged in correspondence with the hydraulic cylinders; the distance from each laser range finder to the center point of the large-length-diameter-ratio tubular member is consistent; the laser range finder is located at the end of the to-be-welded interface close to the to-be-welded workpiece clamped by the moving slide.

[0034] Step four: presetting the laser range finder collection time interval Δt ( Δt According to the overall time of friction welding, the time interval is divided into four equal parts, and the laser range finder collects data once every Δt According to the hydraulic cylinder control algorithm, the pressure values of the plurality of hydraulic cylinders are adjusted in real time; The hydraulic cylinder control algorithm is as follows: first, the distance between the laser range finder and the outer circular surface of the tubular member at the current time is obtained , the distance between the laser range finder and the outer circular surface of the tubular member at the previous time interval one Δt time is obtained ; Then, the difference between the distance at the current time and the distance at the previous time is obtained ΔL 1:

[0035] After that, the maximum value of the distance between the laser range finder and the outer circular surface of the tubular member at all recorded times is obtained L max and the minimum value L min , and the distance range at all times is obtained ΔL 2:

[0036] The preset radial run-out threshold value is: if the difference ΔL 1 is within the run-out threshold value and the distance range ΔL 2 is within the run-out threshold value, the hydraulic cylinder of the laser range finder is not adjusted; if the difference ΔL 1 at the current time or the distance range ΔL 2 is outside the run-out threshold value, the pressure value of the hydraulic cylinder is adjusted to control the corresponding radial run-out; the run-out threshold value is 0.08-0.35 mm.

[0037] The hydraulic cylinder pressure value adjustment is as follows: first, the pressure value applied by the hydraulic cylinder at the current time interval one Δt previous time is obtained , and the pressure value applied by the hydraulic cylinder at the current time interval two Δt previous time is obtained , and the pressure change value at the previous time is obtained ΔN :

[0038] If , it indicates that the pressure value of the hydraulic cylinder is increased at the previous moment: if the difference ΔL 1 or the distance difference ΔL 2 is less than the fluctuation threshold range at the current moment, the corresponding hydraulic cylinder of the laser range finder is reduced by one unit of pressure value; if the difference ΔL 1 or the distance difference ΔL 2 is greater than the fluctuation threshold range at the current moment, since the pressure value of the hydraulic cylinder is increased at the previous moment, considering the adjustment hysteresis, the hydraulic cylinder does not adjust at this moment, and the difference ΔL 1 or the distance difference ΔL 2 at the next moment is judged in relation to the fluctuation threshold. If , it indicates that the pressure value of the hydraulic cylinder is reduced at the previous moment: if the difference ΔL 1 or the distance difference ΔL 2 is less than the fluctuation threshold range at the current moment, since the pressure value of the hydraulic cylinder is reduced at the previous moment, considering the adjustment hysteresis, the hydraulic cylinder does not adjust at this moment, and the difference ΔL 1 or the distance difference ΔL 2 at the next moment is judged in relation to the fluctuation threshold; if the difference ΔL 1 or the distance difference ΔL 2 is greater than the fluctuation threshold range at the current moment, the corresponding hydraulic cylinder of the laser range finder is increased by one unit of pressure value. If , it indicates that the pressure value of the hydraulic cylinder is not adjusted at the previous moment: if the difference ΔL 1 or the distance difference ΔL 2 is less than the fluctuation threshold range at the current moment, the corresponding hydraulic cylinder of the laser range finder is reduced by one unit of pressure value; if the difference ΔL 1 or the distance difference ΔL 2 is greater than the fluctuation threshold range at the current moment, the corresponding hydraulic cylinder of the laser range finder is increased by one unit of pressure value.

[0039] Step five: after the pipe member installed in the welding tool is within a reasonable radial fluctuation range, the inertia friction welding equipment automatically completes the automatic welding of the workpiece to be welded.

[0040] Step six: after the welding is completed, first turn off the laser range finder, then loosen the hydraulic cylinder; then loosen the clamping tool of the first and second welding parts respectively, move the slide table back to position, remove the welded part, and remove the excess welding flash.

[0041] Example 3: A welding part control system for inertia friction welding, asFigures 1-3 As shown, the system is implemented through the following steps: Step 1: Five hydraulic cylinders are evenly pre-installed on the moving slide of the inertial friction welding equipment to adjust and control the radial runout of the workpiece to be welded; the pressure range of the hydraulic cylinders is 5 to 50 kN.

[0042] Step 2: After installing the large length-to-diameter ratio shaft component into the welding fixture, pre-clamp it; the outer diameter of the large length-to-diameter ratio shaft component is φ180mm; the exposed length of the large length-to-diameter ratio shaft component after clamping is 400mm.

[0043] Step 3: Fix the base of the laser rangefinder on the inertial friction welding equipment, ensuring that the laser rangefinder's emitting end is located on the upper side of the outer circular surface of the interface to be welded on the shaft component with a large aspect ratio, and that the laser rangefinder's emitting end (receiving end) is perpendicular to the shaft component. This is used to measure the distance from the laser rangefinder to the surface of the shaft component with a large aspect ratio. The number of laser rangefinders is the same as the number of hydraulic cylinders (i.e., five), and the laser rangefinders are set up correspondingly to the hydraulic cylinders. The distance from each laser rangefinder to the center point of the shaft component with a large aspect ratio is the same. The laser rangefinder is located on the interface to be welded, near the end of the workpiece clamped by the moving slide.

[0044] Step 4: Preset the laser rangefinder acquisition time interval Δt ( Δt Divide the total friction welding time evenly (every...) Δt The laser rangefinder collects data once, and adjusts the pressure values ​​of multiple hydraulic cylinders in real time according to the hydraulic cylinder control algorithm. The hydraulic cylinder control algorithm is as follows: First, obtain the distance between the laser rangefinder and the outer surface of the shaft component at the current moment. , one interval Δt The distance between the laser rangefinder and the outer circular surface of the shaft component at the previous moment. ; Then, obtain the difference between the current time and the previous time. ΔL 1:

[0045] Then, obtain the maximum distance between the laser rangefinder and the outer circular surface of the shaft-like component for all recorded times. L max and minimum value L min Obtain the range of distances over all time periods. ΔL 2:

[0046] Preset radial runout threshold: if the difference ΔL 1 is within the fluctuation threshold and the distance difference is large. ΔL2When the difference ΔL 1or distance difference ΔL 2is within the jump threshold, the hydraulic cylinder of the laser range finder is not adjusted; if the difference 1or distance difference

[0047] 2at the current moment is greater than the jump threshold range, the hydraulic cylinder corresponding to the laser range finder is increased by one unit of pressure value. Δt The hydraulic cylinder pressure value adjustment is specifically as follows: first, the pressure value applied at the previous moment Δt 1or distance difference 2is obtained, and the pressure change value ΔN 1or distance difference 2at the previous moment is obtained.

[0048] If 1or distance difference ΔL 2at the current moment is less than the jump threshold range, the hydraulic cylinder corresponding to the laser range finder is decreased by one unit of pressure value; if the difference ΔL 1or distance difference ΔL 2at the current moment is greater than the jump threshold range, the hydraulic cylinder is not adjusted at this moment due to the increase of the pressure value of the hydraulic cylinder at the previous moment, and the relationship between the difference ΔL 1or distance difference ΔL 2at the next moment and the jump threshold is determined. ΔL If 1or distance difference ΔL 2at the current moment is less than the jump threshold range, the hydraulic cylinder is not adjusted at this moment due to the decrease of the pressure value of the hydraulic cylinder at the previous moment, and the relationship between the difference ΔL 1or distance difference ΔL 2at the next moment and the jump threshold is determined; if the difference ΔL 1or distance difference ΔL 2at the current moment is greater than the jump threshold range, the hydraulic cylinder corresponding to the laser range finder is increased by one unit of pressure value. ΔL If 1or distance difference ΔL 2at the current moment is less than the jump threshold range, the hydraulic cylinder corresponding to the laser range finder is decreased by one unit of pressure value; if the difference ΔL 1or distance difference ΔL 2at the current moment is greater than the jump threshold range, the hydraulic cylinder corresponding to the laser range finder is increased by one unit of pressure value.​ΔL 2 greater than the jump threshold range, then the laser range finder corresponding to the hydraulic cylinder increases a unit of pressure value.

[0049] Step five: the shaft member installed in the welding tool is within a reasonable radial jump range, and the inertia friction welding equipment automatically completes the automatic welding of the workpiece to be welded.

[0050] Step six: after the welding is completed, first turn off the laser range finder, then loosen the hydraulic cylinder; then loosen the clamping tool of the first and second welding parts respectively, move the slide table back to position, remove the welded part, and remove the excess welding flash.

Claims

1. A control system for weldments used in inertial friction welding, characterized in that: The system is implemented through the following steps: Step 1: Pre-install multiple hydraulic cylinders evenly on the moving slide of the inertial friction welding equipment; Step 2: After installing the large length-to-diameter ratio pipe / shaft components into the welding fixture, pre-clamp them; The outer diameter of the large length-to-diameter ratio tubular / shaft components is φ20~180mm, and its exposed length after clamping is 100~400mm; Step 3: Fix the base of the laser rangefinder on the inertial friction welding equipment, and ensure that the laser rangefinder emitter is located on the upper side of the outer circular surface of the interface to be welded of the large aspect ratio tube / shaft component, and that the laser rangefinder emitter is perpendicular to the tube / shaft component; Step 4: Preset the laser rangefinder acquisition time interval Δt Every Δt The laser rangefinder collects data once, and adjusts the pressure values ​​of multiple hydraulic cylinders in real time according to the hydraulic cylinder control algorithm. Step 5: After the pipe / shaft components installed in the welding fixture are within a reasonable radial runout range, the inertial friction welding equipment automatically completes the welding of the workpieces to be welded; Step 6: After welding is completed, first turn off the laser rangefinder, then release the hydraulic cylinder; then release the clamping fixtures of the two weldments respectively, move the slide to reset, remove the weldment, and remove any excess welding flash.

2. The welding control system for inertial friction welding according to claim 1, characterized in that: In step one, the number of hydraulic cylinders is 3 to 6; the pressure range of the hydraulic cylinders is 5 to 50 kN.

3. A welding control system for inertial friction welding according to claim 2, characterized in that: In step three, the number of laser rangefinders is the same as the number of hydraulic cylinders, and the laser rangefinders are set up in correspondence with the hydraulic cylinders; the distance from each laser rangefinder to the center point of the large length-to-diameter ratio pipe / shaft component is the same; the laser rangefinder is located at the end of the workpiece to be welded near the moving slide clamping interface.

4. A welding control system for inertial friction welding according to claim 1 or 3, characterized in that: The hydraulic cylinder control algorithm is as follows: First, obtain the distance between the laser rangefinder and the outer surface of the tubular / shaft-like component at the current moment. , one interval Δt The distance between the laser rangefinder and the outer surface of the tubular / shaft-like component at the previous moment ; Then, obtain the difference between the current time and the previous time. ΔL 1: Then, obtain the maximum value of the distance between the laser rangefinder and the outer surface of the tubular / shaft-like component for all recorded times. L max and minimum value L min Obtain the range of distances over all time periods. ΔL 2: Preset radial runout threshold: if the difference ΔL 1 is within the fluctuation threshold and the distance difference is large. ΔL 2. When the value is within the fluctuation threshold, the hydraulic cylinder of the laser rangefinder does not adjust; if the difference at the current moment... ΔL 1 or distance range ΔL 2. When the runout threshold is outside, the hydraulic cylinder pressure is adjusted to control the corresponding radial runout.

5. A method for controlling the clamping accuracy of shaft / tube components with large length-to-diameter ratio in inertial friction welding according to claim 1 or 4, characterized in that: The jump threshold is 0.08 to 0.35 mm.

6. The method for controlling the clamping accuracy of shaft / tube components with large length-to-diameter ratio in inertial friction welding according to claim 4, characterized in that: The hydraulic cylinder pressure adjustment specifically involves: first, obtaining the current time interval of the hydraulic cylinder... Δt The pressure value applied in the previous moment Two intervals from the current time Δt The pressure value applied at the previous moment Obtain the pressure change values ​​from previous time points. ΔN : like This indicates that the hydraulic cylinder pressure increased at the previous moment: if the difference at the current moment... ΔL 1 or distance range ΔL When the pressure of the hydraulic cylinder corresponding to the laser rangefinder is less than the fluctuation threshold range, the pressure value is reduced by one unit; if the difference at the current moment is... ΔL 1 or distance range ΔL When the fluctuation exceeds the threshold range, due to the increase in hydraulic cylinder pressure in the previous moment, and considering the adjustment lag, the hydraulic cylinder does not adjust at this moment; the difference for the next moment is then determined. ΔL 1 or distance range ΔL 2. Relationship with bounce threshold; like This indicates that the hydraulic cylinder pressure was reduced at the previous moment: if the difference at the current moment... ΔL 1 or distance range ΔL When the pressure is less than the fluctuation threshold, the hydraulic cylinder pressure was reduced in the previous moment. Considering the adjustment lag, the hydraulic cylinder does not adjust at this moment; the difference for the next moment is then determined. ΔL 1 or distance range ΔL 2. Relationship with the bounce threshold; if the difference at the current time is... ΔL 1 or distance range ΔL When the pressure value is greater than the jump threshold range, the hydraulic cylinder corresponding to the laser rangefinder will increase by one unit. like This indicates that the hydraulic cylinder pressure value was not adjusted at the previous moment: if the difference at the current moment... ΔL 1 or distance range ΔL When the pressure of the hydraulic cylinder corresponding to the laser rangefinder is less than the fluctuation threshold range, the pressure value is reduced by one unit; if the difference at the current moment is... ΔL 1 or distance range ΔL When the pressure value is greater than the jump threshold range, the hydraulic cylinder corresponding to the laser rangefinder will increase by one unit of pressure.

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