Welding tool for ceramic coating stirring head

Abstract

The invention relates to a welding tool for a ceramic coating stirring head, which comprises a working rack and a bearing platform fixedly mounted on the upper end face of the working rack, a stirring head assembly is further mounted at the upper end of the working rack, and the bearing platform is positioned below the stirring head assembly and is used for bearing a to-be-welded workpiece; the stirring head assembly can move in the X-axis direction, the Y-axis direction and the Z-axis direction relative to the bearing platform. The stirring head assembly comprises a connecting disc, a shaft shoulder and a stirring needle, wherein the shaft shoulder and the stirring needle are installed at the lower end of the connecting disc. The shaft shoulder is connected to the lower end of the driving disc; and performing ceramic coating treatment on a shaft shoulder and a stirring needle of the tool steel stirring head. By utilizing the characteristics of wear resistance, corrosion resistance, adhesion prevention, high hardness, high temperature resistance and good biocompatibility of the ceramic coating, compared with a hard alloy stirring head, the stirring head body is low in processing difficulty, meets the welding of special materials, is better in toughness compared with the hard alloy, and is far lower than the whole hard alloy in cost.

Description

Technical Field

[0001] The invention belongs to the technical field of stir friction welding, and in particular relates to a welding tool with a ceramic coating stirring head. Background Art

[0002] With the rapid development of aerospace, high-speed rail and medical technology, the use of some special materials has become more and more frequent. Among them, titanium alloy is the most representative. Due to its good physical properties, it is often used in aerospace, high-speed rail parts, artificial bones and other fields.

[0003] Currently, the range of materials applicable to friction stir welding and processing (FSW / P) technology has been actively expanded from relatively low-melting-point alloy systems such as aluminum and magnesium to high-melting-point metals such as copper, steel, titanium, and nickel. Based on this, this low-cost, high-efficiency, and energy-saving solid-state FSW technology, and the derived FSP concept, also provide new methods and new ideas for welding titanium and titanium alloys.

[0004] The stirring heads used in conventional titanium alloy friction stir welding are mostly made of cemented carbide. Some common cemented carbides on the market already contain titanium metal. Titanium-containing cemented carbides will have a strong affinity with titanium alloys, which will aggravate the bonding wear of the stirring head during the welding process and are not suitable for titanium alloy welding. Although other types of cemented carbides have high hardness and good wear resistance, they are also very brittle and easily break during the welding process. In addition, it is very difficult to make these materials into special structural processes for stirring heads.

[0005] Therefore, there is an urgent need for a welding tool with a ceramic coating stirring head that can solve the above problems. Summary of the Invention

[0006] In order to solve the above problems, the present invention proposes a welding tool for a ceramic-coated stirring head, comprising a workbench and a carrying platform fixedly mounted on the upper end surface of the workbench, a stirring head assembly is also mounted on the upper end of the workbench, and the carrying platform is located below the stirring head assembly for carrying the workpiece to be welded;

[0007] The stirring head assembly can move relative to the carrying platform in the X, Y, and Z axis directions;

[0008] The stirring head assembly includes a connecting plate, a shaft shoulder mounted on the lower end of the connecting plate, and a stirring needle, and the transmission plate is connected to a high-speed rotating drive motor;

[0009] Wherein, the shaft shoulder connection is arranged at the lower end of the transmission disc;

[0010] Among them, ceramic coating treatment is carried out at the shoulder and the stirring pin positions of the tool steel material stirring head.

[0011] Furthermore, the stirring head assembly is also provided with a starting protection mechanism, and the starting protection mechanism is rigidly connected to the stirring head;

[0012] Among them, the transmission disc includes an annular boss and weakening balls circumferentially arrayed on the outer periphery of the annular boss. The annular boss is rigidly connected to the lower end face of the transmission disc body and is connected to the starting protection mechanism through the weakening balls;

[0013] When the driving motor starts instantaneously, the starting protection mechanism rotates relative to the transmission disc; when the stirring head rotates smoothly, the starting protection mechanism is relatively fixed to the transmission disc.

[0014] Furthermore, a weakening ball groove is formed on the inner peripheral surface of the starting protection mechanism, and the shape and size of the weakening ball groove match those of the weakening balls;

[0015] The weakening balls are configured to elastically stretch out of the outer peripheral surface of the annular boss or partially retract into the outer peripheral surface of the annular boss.

[0016] Furthermore, a number of expansion holes are arrayed on the outer peripheral surface of the annular boss, and the number thereof is the same as that of the weakening balls;

[0017] The weakening balls include hemispheres and guide columns fixedly installed at the bottoms of the hemispheres, and the guide columns are slidably installed in the expansion holes;

[0018] A spring unit is further arranged in the expansion holes, one end of which is connected to the end face of the guide column, and the other end is connected to the bottom surface of the expansion holes.

[0019] Furthermore, the bearing platform includes a support platform, an X-axis positioning and clamping mechanism and a Y-axis positioning and clamping mechanism arranged above the support platform;

[0020] Among them, the X-axis positioning and clamping mechanism includes a number of X-axis positioning members and a number of X-axis clamping members. The X-axis positioning members are installed at one end of the support platform, and the X-axis clamping members are installed at the other end of the support platform;

[0021] The Y-axis positioning and clamping mechanism includes a number of Y-axis positioning members and a number of Y-axis clamping members. The Y-axis positioning members are installed at one end of the support platform, and the Y-axis clamping members are installed at the other end of the support platform.

[0022] Furthermore, the bearing platform further includes a number of Z-axis clamping members evenly distributed on both sides in the Y-axis direction of the welding workpiece and arranged above the support platform;

[0023] Among them, a detection element is further arranged on the Z-axis clamping member to monitor the moving speed of the stirring head assembly in the X-axis direction.

[0024] Further, the X-axis clamping member includes an oil cylinder and a clamping head that is telescopically connected to the moving end of the oil cylinder, and the clamping head contacts the welding workpiece to press it tightly;

[0025] The X-axis positioning member is located on the initial side of the stirring head assembly, and the X-axis clamping member is located on the end side of the stirring head assembly;

[0026] Wherein, in the first state, the clamping head is relatively fixed to the moving end; in the second state, the clamping head slides relative to the moving end.

[0027] Further, a sliding groove is provided at the top end of the moving end;

[0028] The clamping head includes a chuck and a telescopic portion provided at one end of the chuck close to the moving end. The chuck contacts the welding workpiece to press it tightly. The telescopic portion is slidably arranged in the sliding groove, and the shape and size of the telescopic portion match those of the sliding groove;

[0029] Rectangular through holes are provided on the flat end surfaces on both sides of the telescopic portion, and triangular teeth that can elastically slide are arranged in the rectangular through holes;

[0030] A plurality of tooth grooves are provided on the inner flat end surface of the sliding groove, and the plurality of tooth grooves are arranged in a horizontal array, and the number of tooth grooves is greater than the number of triangular teeth.

[0031] Further, one end of the triangular tooth away from the tooth groove is a connecting portion, and the shape and size of the connecting portion match those of the rectangular through hole;

[0032] One end of the triangular tooth close to the tooth groove is a tooth portion, and the shape and size of the tooth portion match those of the tooth groove;

[0033] A spring is further arranged in the rectangular through hole. One end of the spring is connected to the lower end surface of the upper connecting portion, and the other end is connected to the upper end surface of the lower connecting portion.

[0034] Further, an outer sleeve portion is provided on the lower end surface of the upper connecting portion, and an inner insertion tube portion is provided on the upper end surface of the lower connecting portion, and the outer diameter of the inner insertion tube portion matches the inner diameter of the outer sleeve portion;

[0035] Wherein, the spring is arranged inside the inner insertion tube portion and the outer sleeve portion, and its size matches that of the inner insertion tube portion.

[0036] Compared with the prior art, the advantages of the present invention are as follows:

[0037] 1. The present invention performs ceramic coating treatment on the shoulder and the stirring pin of the stirring head made of ordinary tool steel to increase the wear resistance of the stirring head. Through this setting, by utilizing the characteristics of the ceramic coating such as wear resistance, corrosion resistance, anti-adhesion, high hardness, high temperature resistance, and good biocompatibility, compared with the cemented carbide stirring head, the stirring head body of the present invention has low processing difficulty, can simultaneously meet the welding of special materials, has relatively better toughness than cemented carbide, and its cost is much lower than that of the overall cemented carbide.

[0038] 2. For the stirring head assembly of the present invention, by starting the protection mechanism, at the moment when the driving motor starts, a slight relative rotation occurs between the shoulder, the stirring pin and the transmission disk. Thus, at the moment of starting, the rotation speed and acceleration of the stirring head will have starting weakening, and finally, the impact on the stirring head at the moment of starting can be avoided, and the service life of the stirring head with ceramic coating can be prolonged.

[0039] 3. Through the cooperation of the weakening ball and the weakening ball groove, at the moment when the driving motor starts, during the process of the weakening ball retracting, circumferential sliding occurs between the weakening ball and the weakening ball groove, so that the starting protection mechanism rotates relative to the annular boss. Therefore, within the instantaneous starting time period, the rotation angle of the stirring head is less than the rotation angle of the transmission disk, and the rotation speed and acceleration of the stirring head at the moment of starting have starting weakening.

[0040] 4. When the welding speed is too fast, the welded workpiece follows the stirring head to generate a small displacement, avoiding the situation that the relative displacement speed between the stirring head and the welded workpiece is too large, which may cause the ceramic coating to be subjected to excessive impact during the period when the execution action is late. In this way, it does not completely depend on the operation reaction time of the control system, and eliminates the short-term excessive impact on the ceramic coating caused by the lag of the execution action.

[0041] 5. When in the normal welding speed state, under the elastic force of the spring, the triangular teeth remain in the extended state and engage with the tooth grooves, so that the clamping head and the action end are relatively fixed; when the welding speed is too fast, the acting force between the stirring head and the welded workpiece increases, the spring is compressed under the increased force, and the triangular teeth disengage from the tooth grooves and enter the next adjacent tooth groove, so that the clamping head and the action end slide relatively. The welded workpiece follows the stirring head to generate a small displacement, so that during the period when the execution action of the execution end is late, the ceramic coating can automatically avoid being subjected to short-term excessive impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0043] Figure 1 It is the overall structure diagram of the welding tool for the ceramic coating stirring head;

[0044] Figure 2 is Figure 1 Partial enlarged view of area A in

[0045] Figure 3 Overall structure diagram of the bearing platform;

[0046] Figure 4 is Figure 3 Partial enlarged view of area B in

[0047] Figure 5 Overall structure diagram of the stirring head assembly;

[0048] Figure 6 Front view of the stirring head assembly;

[0049] Figure 7 is Figure 6 Partial enlarged view of area C in

[0050] Figure 8 is Figure 6 Cross-sectional view taken along A - A in

[0051] Figure 9 is Figure 8 Partial enlarged view of area D in

[0052] Figure 10 is Figure 6 Cross-sectional view taken along B - B in

[0053] Figure 11 Partial cross-sectional view of the X-axis clamping part;

[0054] Figure 12 is Figure 11 Partial enlarged view of area E in

[0055] Figure 13 is Figure 12 Partial enlarged view of area F in

[0056] In the figure, there are a workbench frame 100, an X-axis gantry 110, a Y-axis slide rail group 120, a Z-axis lifting frame 130, a bearing platform 200, a support platform 210, an X-axis positioning and clamping mechanism 220, an X-axis positioning part 221, an X-axis clamping part 222, a Y-axis positioning and clamping mechanism 230, a Y-axis positioning part 231, a Y-axis clamping part 232, a Z-axis clamping mechanism 240, a Z-axis clamping part 241, a detection element 242, a stirring head assembly 300, a transmission disk 310, an annular boss 311, a weakening ball 312, a transmission disk body 313, a telescopic hole 314, a hemispherical body 315, a guiding column 316, a spring unit 317, a stirring head 320, a shaft shoulder 321, a stirring pin 322, a starting protection mechanism 330, a weakening ball groove 331, a welding workpiece 400, an oil cylinder 500, an action end 510, a sliding groove 511, a tooth groove 512, a clamping head 600, a chuck 610, a telescopic part 620, a rectangular through hole 621, triangular teeth 622, a connecting part 623, a tooth part 624, a spring 625, an outer sleeve part 626, and an inner inserted cylinder part 627. Detailed implementation manners

[0057] In order to make the purpose, technical solutions and advantages of the present application more clear and understandable, the present application will be described and explained below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. Based on the embodiments provided in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0058] As Figure 1-13 shown, this embodiment provides a welding tool for a ceramic-coated stirring head, including a workbench frame 100 and a bearing platform 200 fixedly installed on the upper end surface of the workbench frame 100. The upper end of the workbench frame 100 is further installed with a stirring head assembly 300, and the bearing platform 200 is located below the stirring head assembly 300 for bearing a workpiece 400 to be welded; wherein, the stirring head assembly 300 can move relative to the bearing platform 200 in the X, Y, and Z axis directions. Thus, the stirring head assembly 300 moves relative to the bearing platform 200 in the X-axis direction to make the stirring head travel forward along the seam of the welded part; the stirring head assembly 300 moves relative to the bearing platform 200 in the Y-axis direction to make the stirring head align with the weld seam; the stirring head assembly 300 moves relative to the bearing platform 200 in the Z-axis direction to make the stirring head press down and plunge into the starting position of the workpiece to be welded.

[0059] Specifically, an X-axis gantry 110 that can slide relative to the workbench 100 is provided on the workbench 100. A Y-axis slide rail group 120 is provided at the front end of the X-axis gantry. A Z-axis lifting frame 130 is provided at the front end of the Y-axis slide rail group 120. Among them, the stirring head assembly 300 is rotatably installed at the lower end of the Z-axis lifting frame 130, and a drive motor for driving the stirring head to rotate at high speed is also installed inside the Z-axis lifting frame 130.

[0060] The bearing platform 200 of this embodiment includes a support table 210, an X-axis positioning and clamping mechanism 220, and a Y-axis positioning and clamping mechanism 230 provided above the support table 210 to position and fix the welding workpiece 400 in the correct position. Specifically, the X-axis positioning and clamping mechanism 220 includes a plurality of X-axis positioning members 221 and a plurality of X-axis clamping members 222. Among them, the X-axis positioning members 221 are installed at one end of the support table 210, and the X-axis clamping members 222 are installed at the other end of the support table 210. The Y-axis positioning and clamping mechanism 230 includes a plurality of Y-axis positioning members 231 and a plurality of Y-axis clamping members 232. Among them, the Y-axis positioning members 231 are installed at one end of the support table 210, and the Y-axis clamping members 232 are installed at the other end of the support table 210.

[0061] Thus, after the welding workpiece 400 is placed on the support table 210, two adjacent sides are respectively in contact with the X-axis positioning member 221 and the Y-axis positioning member 231. The other two adjacent sides of the welding workpiece 400 activate and extend the X-axis clamping member 222 and the Y-axis clamping member 232 to fix the welding workpiece 400 in the correct position. Preferably, both the X-axis positioning member 221 and the Y-axis positioning member 231 are L-shaped for positioning rectangular workpieces.

[0062] The bearing platform 200 of this embodiment further includes a Z-axis clamping mechanism 240 provided above the support table 210. Specifically, the Z-axis clamping mechanism 240 includes a plurality of Z-axis clamping members 241 evenly distributed on both sides of the welding workpiece 400 in the Y-axis direction, thereby further improving the stability of the equipment operation.

[0063] The stirring head assembly 300 of this embodiment includes a connecting disc 310 and a stirring head 320 installed at the lower end of the connecting disc 310. Among them, the driving disc 310 is drivingly connected to the drive motor that rotates at high speed, so as to drive the stirring head 320 to rotate at high speed through the driving disc 310. Specifically, the stirring head 320 includes a shoulder 321 and a stirring pin 322. Among them, the shoulder 321 is connected and provided at the lower end of the driving disc 310.

[0064] The workbench 100 is provided with a controller for controlling the X-axis gantry 110, the Y-axis slide rail group 120, the Z-axis lifting frame 130, the X-axis clamping member 222, the Y-axis clamping member 232, the Z-axis clamping member 241, and the drive motor, etc.

[0065] Understandably, the stirring heads currently used in titanium alloy friction stir welding are mostly made of cemented carbide. Some common cemented carbides on the market already contain titanium metal, which can produce a strong affinity with titanium alloys, exacerbating the adhesion and wear of the stirring head during welding. Therefore, they are not suitable for titanium alloy welding. While other types of cemented carbides have high hardness and good wear resistance, they are also brittle and easily break during welding. Furthermore, it is difficult to create special structural processes for stirring heads made of these materials.

[0066] To eliminate the above-mentioned defects, in this embodiment, a ceramic coating is applied to the shaft shoulder 321 and the stirring needle 322 of the ordinary tool steel stirring head 320 to increase the wear resistance of the stirring head 320. Through this arrangement, the ceramic coating is used to utilize the wear resistance, corrosion resistance, anti-sticking, high hardness, high temperature resistance, and good biocompatibility. Compared with cemented carbide stirring heads, the stirring head body of this embodiment is less difficult to process, meets the requirements for welding special materials, and has better toughness than cemented carbide. Its cost is much lower than that of solid cemented carbide.

[0067] It should be noted that the main process parameters affecting the formation of friction stir welded joints are the rotation speed of the stir head, welding speed, penetration depth, and the structure of the stir head. To ensure sufficient welding heat input, a higher rotation speed or a lower welding speed is required. In practice, welding efficiency is often considered, so the welding speed is often increased, which also requires a corresponding increase in the rotation speed to ensure welding heat input. However, due to the brittleness of ceramic materials, their impact resistance is relatively poor and they are easily broken when impacted.

[0068] In order to eliminate the above defects, on the one hand, in this embodiment, the stirring head assembly 300 is further provided with a starting protection mechanism 330, and the starting protection mechanism 330 is rigidly connected to the stirring head 320, so that the transmission disk 310 drives the stirring head 320 to rotate through the starting protection mechanism 330.

[0069] In the stirring head assembly 300 of this embodiment, the start-up protection mechanism 330 causes a slight relative rotation between the shaft shoulder 321, the stirring needle 322, and the transmission plate 310 at the moment the drive motor is started. This weakens the speed and acceleration of the stirring head 320 at the moment of startup, ultimately preventing impact on the stirring head 320 at startup and extending the service life of the ceramic-coated stirring head.

[0070] Specifically, in this embodiment, the drive disk 310 includes an annular boss 311 and weakening balls 312 circumferentially arrayed on the outer periphery of the annular boss 311. The annular boss 311 is rigidly connected to the lower end face of the drive disk body 313 and is connected to the starting protection mechanism 330 through the weakening balls 312. Thus, during operation, the drive motor drives the drive disk 310 to rotate, and the drive disk 310 drives the starting protection mechanism 330 and the stirring head 320 to rotate through the weakening balls 312.

[0071] Among them, when the drive motor starts instantaneously, the starting protection mechanism 330 and the drive disk 310 rotate relative to each other; when the stirring head 320 rotates smoothly, the starting protection mechanism 330 and the drive disk 310 are relatively fixed.

[0072] Through this setting, at the moment when the drive motor starts, the starting protection mechanism 330 (i.e., the stirring head 320) rotates relative to the drive disk 310. Thus, within the same instantaneous time, the rotation speed of the stirring head 320 is less than the rotation speed of the output shaft, that is, the rotation speed and acceleration of the stirring head 320 are weakened at the start instant.

[0073] In this embodiment, a weakening ball groove 331 is formed on the inner peripheral surface of the starting protection mechanism 330, and the shape and size of the weakening ball groove 331 match those of the weakening balls 312; the weakening balls 312 are configured to be elastically stretchable and extend out of the outer peripheral surface of the annular boss 311 or partially retract into the outer peripheral surface of the annular boss 311.

[0074] Thus, when the drive motor starts instantaneously, the rotation speed increases from zero, and the instantaneous acceleration is very large. The extrusion force between the weakening balls 312 and the weakening ball groove 331 exceeds the elastic force received by the weakening balls 312, and the weakening balls 312 partially retract into the outer peripheral surface of the annular boss 311. During the retraction process of the weakening balls 312, the starting protection mechanism 330 rotates relative to the annular boss 311, that is, the acceleration of the stirring head 320 is weakened relative to the drive disk 310.

[0075] When the stirring head 320 rotates smoothly, it enters a uniform speed state, and the acceleration is approximately zero. The extrusion force between the weakening balls 312 and the weakening ball groove 331 does not exceed the elastic force received by the weakening balls 312, and the weakening balls 312 completely extend out of the outer peripheral surface of the annular boss 311. The starting protection mechanism 330 does not rotate relative to the annular boss 311, that is, the stirring head 320 rotates synchronously.

[0076] By weakening the cooperation between the weakening ball 312 and the weakening ball groove 331, when the driving motor starts, during the process of the weakening ball 312 retracting, circumferential sliding occurs between the weakening ball 312 and the weakening ball groove 331, so that the protection mechanism 330 rotates relative to the annular boss 311. Therefore, within the instantaneous starting time period, the rotation angle of the stirring head 320 is less than the rotation angle of the transmission disk 310, and the rotation speed and acceleration of the stirring head 320 are weakened at the start.

[0077] Specifically, a plurality of telescopic holes 314 are arrayed on the outer peripheral surface of the annular boss 311, and the number thereof is the same as that of the weakening balls 312; correspondingly, the weakening balls 312 include hemispheres 315 and guide columns 316 fixedly installed at the bottoms of the hemispheres 315, and the guide columns 316 are slidably installed in the telescopic holes 314; a spring unit 317 is further arranged in the telescopic holes 314, one end of which is connected to the end face of the guide column 316, and the other end is connected to the bottom face of the telescopic hole 314, so that the weakening balls 312 can elastically expand and contract. Thus, during the process of the weakening balls 312 being squeezed, the spring unit 317 gives the weakening balls 312 an outward elastic force.

[0078] It should be noted that in order to improve the efficiency in this embodiment, the welding speed needs to be increased, that is, the speed at which the stirring head assembly 300 moves relative to the carrying platform 200 in the X-axis direction. If the speed is too low, it will significantly affect the welding efficiency, and if the speed is too high, the ceramic coating will be subjected to excessive impact. For this reason, a detection element 242 is further arranged on the Z-axis clamping member 241 of this embodiment to monitor the speed at which the stirring head assembly 300 moves in the X-axis direction, and the detection element 242 is connected to the controller.

[0079] It can be understood that when the detection element 242 monitors that the stirring head assembly 300 moves too fast, it will feedback to the controller. After the controller makes a judgment, it will send an instruction to the X-axis gantry 110 and / or the driving motor, so that the equipment stops or reduces the moving speed of the X-axis gantry 110. However, due to the above feedback, judgment, and execution processes, the execution action of the execution end will be a little later, and finally the ceramic coating will be subjected to a short-term excessive impact, affecting the service life.

[0080] In order to eliminate the above problems, in this embodiment, the X-axis clamping member 222 includes an oil cylinder 500 and a clamping head 600 that can be telescopically connected to the action end 510 of the oil cylinder 500, and the clamping head 600 contacts the welding workpiece 400 to press it tightly; and the X-axis positioning member 221 is located on the initial side of the stirring head assembly 300, and the X-axis clamping member 222 is located on the end side of the stirring head assembly 300. It can be understood that Figure 1 In the perspective view, the stirring head assembly 300 is in the initial position.

[0081] Among them, in the first state, the clamping head 600 is relatively fixed to the moving end 510; in the second state, the clamping head 600 slides relative to the moving end 510.

[0082] Therefore, during the welding process: when in the normal welding speed state, the clamping head 600 is relatively fixed to the moving end 510, so that the X-axis positioning and clamping mechanism 220 is in the normal working state; when the welding speed is too fast, the force between the stirring head 320 and the welding workpiece 400 increases, and the clamping head 600 slides relative to the moving end 510. As a result, the welding workpiece 400 generates a small displacement following the stirring head 320, so that during the period when the execution action of the execution end is late, the ceramic coating is protected from short-term excessive impact.

[0083] Through the above settings, when the welding speed is too fast, the welding workpiece 400 generates a small displacement following the stirring head 320, avoiding the relative displacement speed between the stirring head 320 and the welding workpiece 400 from being too large, and preventing the ceramic coating from being subjected to excessive impact during the period when the execution action is late. In this way, it does not completely rely on the operation reaction time of the control system, and eliminates the short-term excessive impact on the ceramic coating caused by the lag of the execution action.

[0084] Specifically, a sliding groove 511 is formed at the top end of the moving end 510. The clamping head 600 includes a chuck 610 and a telescopic part 620 arranged at one end of the chuck 610 close to the moving end 510. The chuck 610 contacts the welding workpiece 400 to clamp it tightly. The telescopic part 620 is slidably arranged in the sliding groove 511, and the shape and size of the telescopic part 620 match those of the sliding groove 511.

[0085] Rectangular through holes 621 are formed on the flat end surfaces on both sides of the telescopic part 620, and elastically slidable triangular teeth 622 are arranged in the rectangular through holes 621. Correspondingly, a plurality of tooth grooves 512 are formed on the inner flat end surface of the sliding groove 511, and the plurality of tooth grooves 512 are arranged in a horizontal array, and the number of tooth grooves 512 is greater than the number of triangular teeth 622.

[0086] One end of the triangular tooth 622 away from the tooth groove 512 is a connecting part 623, and the shape and size of the connecting part 623 match those of the rectangular through hole 621, so that the triangular tooth 622 can slide relative to the rectangular through hole 621; one end of the triangular tooth 622 close to the tooth groove 512 is a tooth part 624, and the shape and size of the tooth part 624 match those of the tooth groove 512, so that the triangular tooth 622 can engage with the tooth groove 512.

[0087] A spring 625 is further disposed in the rectangular through hole 621. One end of the spring 625 is connected to the lower end surface of the upper connecting portion 623, and the other end is connected to the upper end surface of the lower connecting portion 623. Preferably, an outer sleeve portion 626 is provided on the lower end surface of the upper connecting portion 623, and an inner insertion cylinder portion 627 is provided on the upper end surface of the lower connecting portion 623. The outer diameter of the inner insertion cylinder portion 627 matches the inner diameter of the outer sleeve portion 626. The spring 625 is disposed inside the inner insertion cylinder portion 627 and the outer sleeve portion 626, and its size matches that of the inner insertion cylinder portion 627.

[0088] Thus, during the welding process: when in the normal welding speed state, under the elastic force of the spring 625, the triangular teeth 622 remain in the extended state and engage with the tooth grooves 512, so that the clamping head 600 and the moving end 510 are relatively fixed; when the welding speed is too fast, the force between the stirring head 320 and the welding workpiece 400 increases, the spring 625 is compressed under the increased force, and the triangular teeth 622 disengage from the tooth groove 512 and enter the adjacent next tooth groove 512, so that the clamping head 600 and the moving end 510 slide relatively.

[0089] It should be noted that when the welding speed is too fast, when the detection element 242 monitors that the stirring head assembly 300 moves too fast, it will feedback to the controller. After determination by the controller, an instruction is sent to the X-axis gantry 110 and / or the drive motor, so that the equipment stops or reduces the moving speed of the X-axis gantry 110. Although the above feedback, judgment, and execution processes will cause a lag in execution, the welding workpiece 400 follows the stirring head 320 to generate a small displacement, so that during the period when the execution action of the execution end is late, the ceramic coating is automatically protected from short-term excessive impact.

[0090] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any change or replacement that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A welding tool for a ceramic-coated stirring head, comprising a workbench frame and a bearing platform fixedly installed on the upper end surface of the workbench frame. A stirring head assembly is also installed at the upper end of the workbench frame, and the bearing platform is located below the stirring head assembly for bearing the workpiece to be welded; Among them, The stirring head assembly can move relative to the bearing platform in the X, Y, and Z axis directions; The stirring head assembly includes a connecting disk, a shoulder and a stirring pin installed at the lower end of the connecting disk, and the driving disk is drivingly connected to a high-speed rotating driving motor; Among them, the shoulder is connected to the lower end of the driving disk; It is characterized in that ceramic coating treatment is performed at the positions of the shoulder and the stirring pin of the stirring head made of tool steel.

2. The welding tool for the ceramic-coated stirring head according to claim 1, wherein, The stirring head assembly is also provided with a starting protection mechanism, and the starting protection mechanism is rigidly connected to the stirring head; Among them, the driving disk includes an annular boss and weakening balls circumferentially arrayed on the outer periphery of the annular boss. The annular boss is rigidly connected to the lower end surface of the driving disk body and is connected to the starting protection mechanism through the weakening balls; When the driving motor starts instantaneously, the starting protection mechanism rotates relative to the driving disk; when the stirring head rotates smoothly, the starting protection mechanism is relatively fixed to the driving disk.

3. The welding tool for the ceramic-coated stirring head according to claim 2, characterized in that, The inner peripheral surface of the starting protection mechanism is provided with a weakening ball groove, and the shape and size of the weakening ball groove match those of the weakening ball; The weakening balls are configured to be elastically telescopic and extend out of the outer peripheral surface of the annular boss or partially retract into the outer peripheral surface of the annular boss.

4. The welding tool for the ceramic-coated stirring head according to claim 3, characterized in that, A number of telescopic holes are arrayed on the outer peripheral surface of the annular boss, and the number thereof is the same as that of the weakening balls; The weakening balls include hemispheres and guide columns fixedly installed at the bottoms of the hemispheres, and the guide columns are slidably installed in the telescopic holes; A spring unit is also arranged in the telescopic hole, one end of which is connected to the end face of the guide column and the other end is connected to the bottom face of the telescopic hole.

5. The welding tool for the ceramic-coated stirring head according to claim 1, characterized in that, The bearing platform includes a support table, an X-axis positioning and clamping mechanism and a Y-axis positioning and clamping mechanism arranged above the support table; Among them, the X-axis positioning and clamping mechanism includes a number of X-axis positioning members and a number of X-axis clamping members. The X-axis positioning members are installed at one end of the support table, and the X-axis clamping members are installed at the other end of the support table; The Y-axis positioning and clamping mechanism includes a number of Y-axis positioning members and a number of Y-axis clamping members. The Y-axis positioning members are installed at one end of the support table, and the Y-axis clamping members are installed at the other end of the support table.

6. The welding tool for the ceramic-coated stirring head according to claim 5, characterized in that, The bearing platform also includes a number of Z-axis clamping members evenly distributed on both sides of the welded workpiece in the Y-axis direction and arranged above the support table; Among them, a detection element is also arranged on the Z-axis clamping member to monitor the speed of the stirring head assembly moving in the X-axis direction.

7. The welding tool for the ceramic-coated stirring head according to claim 5, characterized in that, The X-axis clamping member includes an oil cylinder and a clamping head that can be telescopically connected to the moving end of the oil cylinder, and the clamping head contacts the welded workpiece to press it tightly; The X-axis positioning member is located on the initial side of the stirring head assembly, and the X-axis clamping member is located on the end side of the stirring head assembly; Among them, in the first state, the clamping head is relatively fixed to the moving end; in the second state, the clamping head slides relative to the moving end.

8. The welding tool for the ceramic-coated stirring head according to claim 7, characterized in that, A sliding groove is opened at the top end of the moving end; The clamping head includes a chuck and a telescopic portion arranged at one end of the chuck close to the moving end. The chuck contacts the welded workpiece to press it tightly, and the telescopic portion is slidably arranged in the sliding groove, and the shape and size of the telescopic portion match those of the sliding groove; Rectangular through holes are formed on the flat end surfaces on both sides of the telescopic part, and triangular teeth that can elastically slide are arranged in the rectangular through holes; A plurality of tooth grooves are formed on the flat end surface of the sliding groove, and the plurality of tooth grooves are arranged in a horizontal array, and the number of tooth grooves is greater than the number of triangular teeth.

9. The welding tool for the ceramic-coated stirring head according to claim 8, wherein, One end of the triangular tooth away from the tooth groove is a connecting part, and the shape and size of the connecting part match the rectangular through hole; One end of the triangular tooth close to the tooth groove is a tooth part, and the shape and size of the tooth part match the tooth groove; A spring is further arranged in the rectangular through hole, one end of the spring is connected to the lower end surface of the upper connecting part, and the other end is connected to the upper end surface of the lower connecting part.

10. The welding tool for the ceramic-coated stirring head according to claim 9, characterized in that, A sleeve part is arranged on the lower end surface of the upper connecting part, and an inner inserting cylinder part is arranged on the upper end surface of the lower connecting part, and the outer diameter of the inner inserting cylinder part matches the inner diameter of the sleeve part; Among them, the spring is arranged inside the inner inserting cylinder part and the sleeve part, and the size matches the inner inserting cylinder part.

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