Inertia friction welding machine

Abstract

The present invention discloses an inertia friction welding machine, which includes a rotating end and a moving end. The rotating end is used for clamping a rotating workpiece, and the moving end is used for clamping a moving workpiece. The inertia friction welding machine further includes a first positioning fixture and a second positioning fixture. The first positioning fixture is disposed on the rotating end and is configured to rotate synchronously with the rotating end and can only move along the axial direction of the rotating workpiece. The second positioning fixture is disposed on the moving end and is configured to only move along the axial direction of the moving workpiece. The inertia friction welding machine of the present invention can weld an integral bladed disk with a blade and a rotating shaft and ensure the angular position of the integral bladed disk and the rotating shaft, improve the engine performance, and reduce the overall weight of the engine. Moreover, the inertia friction welding machine is controlled in a pure mechanical manner without the delay effect of electronic control, ensuring the stability and reliability of the welding angular control.

Description

Technical Field

[0001] The present invention relates to an inertia friction welding machine. Background Art

[0002] Inertia friction welding is a welding method that converts the kinetic energy of the rotating flywheel into the frictional deformation energy of the workpiece, and is mainly used for welding workpieces with a circular welding interface. During the welding process, the speed of the flywheel gradually decreases and stops under the action of friction at the workpiece interface. The angle at which the flywheel stops rotating cannot be controlled, and it is currently mainly used for welding parts such as shafts, discs, and drums that have no requirements for the relative angle between the two workpieces.

[0003] To solve the problem that the angle cannot be controlled in rotary friction welding, the existing controllable phase friction welding technology is currently available. Its principle is to apply kinetic energy through a continuously driven motor and control the phase in a mechanical or electronic manner before the end of welding. The principle of electronic phase control is to control the frequency converter through an electronic signal, and the mechanical method is mainly to control through positioning pins and other means. However, this technology cannot currently be applied to the application of large-tonnage aeroengine inertia friction welding parts, mainly for the following three reasons: 1) The current applicable friction welding tonnage of phase friction welding is small, and the positioning pin and electromagnetic methods cannot generate sufficient torque to twist the welding workpiece when the welding is about to end; 2) When using the positioning pin method for control, in addition to being unable to provide sufficient binding force, it will also have an impact on the part, which may cause defects in the welded joint, and the control accuracy of the positioning pin cannot reach the ideal effect, because when the positioning pin has high precision, the positioning pin cannot be inserted in time during the high-speed rotation of the workpiece, resulting in poor accuracy; 3) When using the electronic control method, although the control method belongs to flexible control, there are phenomena of electromagnetic signal delay and non-rigid control of electromagnetic force, resulting in worse phase control accuracy compared to the mechanical system, and this phenomenon is particularly obvious in large tonnages.

[0004] The aeroengine rotor assembly is an integral structure composed of multiple stages of bladed disks. With the continuous improvement of the performance indicators of aeroengines, higher requirements are put forward for the overall weight, material properties, dimensional accuracy, and welding accuracy of the rotor assembly. Currently, advanced aeroengine rotor assemblies widely use materials such as titanium alloys, superalloys, and powder alloys, and it is difficult to achieve high-strength and high-performance welding using traditional methods. Using inertia friction welding is an important technology to achieve high-strength connection of aeroengine rotor bladed disks. However, since traditional inertia friction welding cannot guarantee angular accuracy, the existing process is to weld the disk shaft parts by inertia friction welding and then install the blades. To further improve the engine performance and reduce the overall weight of the engine, the engine is currently gradually using integral bladed disks instead of the separated blade and disk structure. Therefore, it is particularly important to develop an inertia friction welding technology capable of angular accuracy control. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defect that the angular accuracy cannot be guaranteed when an inertia friction welding machine welds a rotor blade disk in the prior art, resulting in the adoption of a split blade disk structure only, and to provide an inertia friction welding machine.

[0006] The present invention solves the above technical problem through the following technical solutions:

[0007] The present invention discloses an inertia friction welding machine, including a rotating end and a moving end. The rotating end is used for clamping a rotating workpiece, and the moving end is used for clamping a moving workpiece. The inertia friction welding machine further includes a first positioning fixture and a second positioning fixture. The first positioning fixture is arranged on the rotating end and is set to rotate synchronously with the rotating end and can only move axially along the rotating workpiece. The second positioning fixture is arranged on the moving end and is set to only move axially along the moving workpiece;

[0008] An elastic member is arranged on a side of the first positioning fixture away from the moving end, and the elastic member is used for applying a force to the first positioning fixture to move it in the direction of the moving end;

[0009] The end face of the first positioning fixture facing the second positioning fixture has a plurality of first grooves arranged at preset angular intervals in the circumferential direction. Second protrusions adapted to the first grooves are arranged on the second positioning fixture. When the rotating end rotates, the second protrusions can enter from one first groove into another first groove;

[0010] And / or, the end face of the second positioning fixture facing the first positioning fixture has a plurality of second grooves arranged at preset angular intervals in the circumferential direction. First protrusions adapted to the second grooves are arranged on the first positioning fixture. When the rotating end rotates, the first protrusions can enter from one second groove into another second groove.

[0011] In this solution, the inertia friction welding machine adopts the above structure. When welding the rotor disk and the rotating shaft of the engine, the relative positions of the first positioning fixture and the second positioning fixture are pre-adjusted by determining the angular positions of the two welded workpieces after welding. In the later stage of the upsetting and pressure-holding stage of workpiece welding, when the rotational speed of the rotating end is relatively low, the first positioning fixture and the second positioning fixture come into contact and generate friction, and under the action of the elastic member, the second protrusion moves between the first grooves and / or the first protrusion moves between the second grooves, continuously reducing the rotational speed of the rotating end. When the speed of the rotating end is relatively low, the inertia of the rotating end cannot make the second protrusion enter the next first groove from one first groove or the first protrusion enter the next second groove from one second groove. At this time, under the additional torque generated by the first positioning fixture and the second positioning fixture, the rotating end starts to move in the reverse direction and performs a pendulum motion with a continuously decreasing amplitude and reduces the speed, finally making the first groove engage with the second protrusion and / or the second groove engage with the first protrusion to end the rotation, so that the angle between the blades on the rotor disk and the preset position on the rotating shaft is consistent with the preset angle, ensuring the accuracy of angular position control. Furthermore, the integral disk with blades and the rotating shaft can be welded and the angular positions of the integral disk and the rotating shaft can be ensured, improving the engine performance and reducing the overall weight of the engine. And this inertia friction welding machine is controlled in a purely mechanical manner, without the delay effect of electronic control, ensuring the stability and reliability of welding angular control.

[0012] Preferably, a first protrusion is formed between two adjacent said first grooves, and a second protrusion is formed between two adjacent said second grooves, and the structural sizes of the first protrusion and the second protrusion are the same.

[0013] In this solution, adopting the above structure can make the first positioning fixture and the second positioning fixture use the same structure, reducing the production cost. At the same time, the cooperation between the first positioning fixture and the second positioning fixture is better, reducing the impact between the two positioning fixtures.

[0014] Preferably, there are multiple said first protrusions and / or said second protrusions.

[0015] In this solution, a greater additional torque is generated between the first protrusion and the second groove and / or the second protrusion and the first groove, further reducing the swing amplitude of the rotating end and improving the accuracy of angular positioning.

[0016] Preferably, the movement track of the second protrusion entering from one said first groove into another said first groove is in a sine curve structure;

[0017] and / or, the movement track of the first protrusion entering from one said second groove into another said second groove is in a sine curve structure.

[0018] In this solution, with the above settings, when the rotating end makes a pendulum motion and continuously reduces the amplitude of the motion, the welded workpiece tends to be smooth and impact-free during the angular position adjustment stage, effectively avoiding the quality impact of rigid impact on the welded joint of the welded workpiece.

[0019] Preferably, the first positioning fixture is arranged on the outer peripheral side of the rotating workpiece, and the second positioning fixture is arranged on the outer peripheral side of the moving workpiece.

[0020] In this solution, with the above structure, the installation is convenient, facilitating the positioning and installation of the first positioning fixture and the second positioning fixture.

[0021] Preferably, the rotating end includes a flywheel, a first slide rail, and a second slide rail. The first slide rail is fixed on the inner peripheral surface of the flywheel, the second slide rail is detachably fixed on the rotating workpiece, and the first positioning fixture is slidably arranged between the first slide rail and the second slide rail.

[0022] In this solution, with the above structure, it simply and conveniently restricts the movement track of the first positioning fixture.

[0023] Preferably, the rotating end further includes a first fixing fixture, the first fixing fixture is fixed to the flywheel, and the rotating workpiece is detachably fixed to the first fixing fixture.

[0024] Preferably, one end of the elastic member is connected to the first positioning fixture, and the other end of the elastic member is connected to the flywheel or the first fixing fixture.

[0025] In this solution, with the above connection method, it is convenient for the elastic member to apply a force for axial movement to the first positioning fixture.

[0026] Preferably, the mobile end includes a second fixing fixture, a third slide rail, and a fourth slide rail. The third slide rail is fixed on the inner peripheral surface of the second fixing fixture, the fourth slide rail is detachably fixed on the moving workpiece, and the second positioning fixture is slidably arranged between the third slide rail and the fourth slide rail.

[0027] In this solution, with the above structure, the structure is simple and it is convenient to install and limit the second positioning fixture.

[0028] Preferably, the mobile end further includes a first driving mechanism, and the first driving mechanism is used to drive the moving workpiece to move towards the rotating workpiece.

[0029] Preferably, the mobile end further includes a second driving mechanism, and the second driving mechanism is used to drive the second positioning fixture to move towards the first positioning fixture.

[0030] Preferably, there are multiple first positioning jigs and / or second positioning jigs.

[0031] In this solution, setting multiple first positioning jigs or second positioning jigs can provide a greater additional torque and enhance the angular control accuracy of the inertia friction welding machine.

[0032] The positive and progressive effects of the present invention are as follows: When the inertia friction welding machine of the present invention welds the rotor disk and the rotating shaft of the engine, by determining the angular positions of the two welded workpieces after welding is completed, the relative positions of the first positioning jig and the second positioning jig are pre-adjusted. In the later stage of the upsetting and pressure-holding stage of workpiece welding when the rotational speed of the rotating end is relatively low, the first positioning jig and the second positioning jig come into contact and generate friction, and under the action of the elastic member, the second protrusions move between the first grooves and / or the first protrusions move between the second grooves, continuously reducing the rotational speed of the rotating end. When the rotational speed of the rotating end is relatively low, the inertia of the rotating end cannot cause the second protrusions to enter the next first groove from one first groove or the first protrusions to enter the next second groove from one second groove. At this time, under the additional torque generated by the first positioning jig and the second positioning jig, the rotating end starts to move in the reverse direction and performs a pendulum motion with a continuously decreasing amplitude and reduces the rotational speed. Finally, the first grooves are engaged with the second protrusions and / or the second grooves are engaged with the first protrusions to end the rotation, so that the angle between the blades on the rotor disk and the preset position on the rotating shaft is consistent with the preset angle, ensuring the accuracy of angular position control. Furthermore, the integral disk with blades and the rotating shaft can be welded and the angular position of the integral disk and the rotating shaft can be ensured, improving the engine performance and reducing the overall weight of the engine. And this inertia friction welding machine is controlled in a pure mechanical manner, without the delay effect of electronic control, ensuring the stability and reliability of welding angular control. Description of the Drawings

[0033] Figure 1 It is a schematic diagram showing the changes in workpiece friction and workpiece rotational speed in each stage of the existing inertia friction welding machine.

[0034] Figure 2 Schematic structural diagram of the inertia friction welding machine in a preferred embodiment of the present invention.

[0035] Figure 3 Schematic structural diagram of the first positioning jig and the second positioning jig in a preferred embodiment of the present invention.

[0036] Figure 4 Schematic diagram of the engagement of the first positioning jig and the second positioning jig in a preferred embodiment of the present invention.

[0037] Figure 5 Phase installation diagram of the first positioning jig and the second positioning jig in the inertia friction welding machine before operation in a preferred embodiment of the present invention.

[0038] Figure 6 Schematic diagram of the changes in workpiece friction and workpiece rotation speed during each stage of the inertia friction welding machine in a preferred embodiment of the present invention.

[0039] Figure 7 Schematic diagram of the position changes of the first positioning fixture and the second positioning fixture during the angular adjustment stage of inertia friction welding in a preferred embodiment of the present invention.

[0040] Description of reference numerals:

[0041] Rotating end 100

[0042] Flywheel 110

[0043] First fixed fixture 120

[0044] Elastic member 130

[0045] First slide rail 140

[0046] Second slide rail 150

[0047] First positioning fixture 160

[0048] First groove 161

[0049] First protrusion 162

[0050] Rotating workpiece 170

[0051] Moving end 200

[0052] Second fixed fixture 210

[0053] First driving mechanism 220

[0054] Second driving mechanism 230

[0055] Third slide rail 240

[0056] Fourth slide rail 250

[0057] Second positioning fixture 260

[0058] Second groove 261

[0059] Second protrusion 262

[0060] Moving workpiece 270 Detailed implementation manners

[0061] The present invention will be more clearly and completely described below by way of examples in conjunction with the accompanying drawings, but the present invention is not limited thereto.

[0062] It should be understood that the present invention uses terms such as "first" and "second" to limit components or structures only for the convenience of distinguishing the corresponding components or structures. Without additional statements, the above terms have no special meanings, and thus should not be construed as limiting the protection scope of the present invention. In addition, certain features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0063] As Figure 2-5 shown, this embodiment discloses an inertia friction welding machine, which includes a rotating end 100 and a moving end 200. The rotating end 100 is used to clamp a rotating workpiece 170, and the moving end 200 is used to clamp a moving workpiece 270. The inertia friction welding machine further includes a first positioning fixture 160 and a second positioning fixture 260. The first positioning fixture 160 is disposed on the rotating end 100 and is configured to rotate synchronously with the rotating end 100 and can only move along the axial direction of the rotating workpiece 170. The second positioning fixture 260 is disposed on the moving end 200 and is configured to only move along the axial direction of the moving workpiece 270.

[0064] An elastic member 130 is provided on a side of the first positioning fixture 160 away from the moving end 200. The elastic member 130 is used to apply a force to the first positioning fixture 160 to move it in the direction of the moving end 200.

[0065] The end face of the first positioning fixture 160 facing the second positioning fixture 260 has a plurality of first grooves 161 arranged at preset angular intervals in the circumferential direction. The second positioning fixture 260 is provided with second protrusions 262 adapted to the first grooves 161. Moreover, the end face of the second positioning fixture 260 facing the first positioning fixture 160 has a plurality of second grooves 261 arranged at preset angular intervals in the circumferential direction. The first positioning fixture 160 is provided with first protrusions 162 adapted to the second grooves 261. When the rotating end 100 rotates, the second protrusions 262 can enter from one first groove 161 into another first groove 161, and the first protrusions 162 can enter from one second groove 261 into another second groove 261.

[0066] The inertia friction welding machine of this embodiment adopts the above structure. When welding the rotor disk and the rotating shaft of the engine, the relative positions of the first positioning fixture 160 and the second positioning fixture 260 are pre-adjusted by determining the angular positions of the two welded workpieces after welding. In the later stage of the upsetting and holding pressure stage of workpiece welding, when the rotational speed of the rotating end 100 is relatively small, the first positioning fixture 160 and the second positioning fixture 260 come into contact and generate friction, and under the action of the elastic member 130, the second protrusion 262 moves between the first grooves 161 and the first protrusion 162 moves between the second grooves 261, continuously reducing the rotational speed of the rotating end 100. When the speed of the rotating end 100 is relatively low, the inertia of the rotating end 100 cannot make the second protrusion 262 enter the next first groove 161 from one first groove 161, nor can it make the first protrusion 162 enter the next second groove 261 from one second groove 261. At this time, under the additional torque generated by the first positioning fixture 160 and the second positioning fixture 260, the rotating end 100 starts to move in the reverse direction and performs a pendulum motion with a continuously decreasing amplitude and reduces the rotational speed. Finally, the first groove 161 is engaged with the second protrusion 262 and the second groove 261 is engaged with the first protrusion 162 to end the rotation, so that the angle between the blades on the rotor disk and the preset position on the rotating shaft is consistent with the preset angle, ensuring the accuracy of angular position control. Furthermore, the integral disk with blades and the rotating shaft can be welded and the angular positions of the integral disk and the rotating shaft can be ensured, improving the engine performance and reducing the overall weight of the engine. And this inertia friction welding machine is controlled in a pure mechanical manner without the delay effect of electronic control, ensuring the stability and reliability of welding angular control. This inertia friction welding machine can be applied to the welding of parts with large tonnage, high angular accuracy and high welding quality.

[0067] In this embodiment, as Figure 2 shown, a first protrusion 162 is formed between two adjacent first grooves 161, a second protrusion 262 is formed between two adjacent second grooves 261, and the structural sizes of the first protrusion 162 and the second protrusion 262 are the same. The above structural setting enables the first positioning fixture 160 and the second positioning fixture 260 to use the same structure, reducing the production cost. At the same time, the cooperation between the first positioning fixture 160 and the second positioning fixture 260 is better, reducing the impact between the two positioning fixtures.

[0068] Moreover, in this embodiment, as Figure 2 shown, there are multiple first protrusions 162 and second protrusions 262. This enables the first protrusion 162 and the second groove 261, as well as the second protrusion 262 and the first groove 161, to generate a greater additional torque, further reducing the swing amplitude of the rotating end 100 and improving the accuracy of angular positioning.

[0069] In some embodiments, the end face of the first positioning fixture 160 facing the second positioning fixture 260 has a plurality of first grooves 161 arranged at preset angular intervals in the circumferential direction. Only one or more second protrusions 262 adapted to the first grooves 161 are provided on the second positioning fixture 260, and no second grooves 261 are provided. When the rotating end 100 rotates, the second protrusion 262 can enter from one first groove 161 into another first groove 161. The second protrusion 262 moves between the first grooves 161, continuously reducing the rotational speed of the rotating end 100. When the speed of the rotating end 100 is relatively low, the inertia of the rotating end 100 cannot make the second protrusion 262 enter from one first groove 161 into the next first groove 161. At this time, under the additional torque generated by the first positioning fixture 160 and the second positioning fixture 260, the rotating end 100 starts to move in the reverse direction and performs a pendulum motion with a continuously decreasing motion amplitude and reduces the rotational speed. Finally, the first groove 161 and the second protrusion 262 are engaged simultaneously, so that the angle between the blade on the rotor disk and the preset position on the rotating shaft is consistent with the preset angle, ensuring the accuracy of the angular position control.

[0070] Alternatively, in some embodiments, the end face of the second positioning fixture 260 facing the first positioning fixture 160 has a plurality of second grooves 261 arranged at preset angular intervals in the circumferential direction. One or more first protrusions 162 adapted to the second grooves 261 are provided on the first positioning fixture 160, and no first grooves 161 are provided. When the rotating end 100 rotates, the first protrusion 162 can enter from one second groove 261 into another second groove 261. The first protrusion 162 moves between the second grooves 261, continuously reducing the rotational speed of the rotating end 100. When the speed of the rotating end 100 is relatively low, the inertia of the rotating end 100 cannot make the first protrusion 162 enter from one second groove 261 into the next second groove 261. At this time, under the additional torque generated by the first positioning fixture 160 and the second positioning fixture 260, the rotating end 100 starts to move in the reverse direction and performs a pendulum motion with a continuously decreasing motion amplitude and reduces the rotational speed. Finally, the second groove 261 and the first protrusion 162 are engaged to end the rotation, so that the angle between the blade on the rotor disk and the preset position on the rotating shaft is consistent with the preset angle, ensuring the accuracy of the angular position control.

[0071] In this embodiment, the movement trajectory of the second protrusion 262 entering from one first groove 161 into another first groove 161 is in a sinusoidal curve structure. The movement trajectory of the first protrusion 162 entering from one second groove 261 into another second groove 261 is in a sinusoidal curve structure. With the above structure, when the rotating end 100 performs a pendulum motion and continuously reduces the motion amplitude, the welding workpiece tends to be smooth and without impact during the angular position adjustment stage, effectively avoiding the quality impact of rigid impact on the welding joint of the welding workpiece.

[0072] As Figure 2 shown. In this embodiment, the first positioning fixture 160 is disposed on the outer peripheral side of the rotating workpiece 170, and the second positioning fixture 260 is disposed on the outer peripheral side of the moving workpiece 270. With the above structure, the installation is convenient, which is conducive to the positioning and installation of the first positioning fixture 160 and the second positioning fixture 260.

[0073] In some embodiments, the first positioning fixture 160 is disposed on the outer peripheral side of the flywheel 110, and the second positioning fixture 260 is disposed on the outer peripheral side of the second fixed fixture 210. It is necessary to ensure that the first positioning fixture 160 and the second positioning fixture 260 can generate friction under pressure during the angular positioning stage and finally achieve bite limit.

[0074] As Figure 2 shown, the rotating end 100 includes a flywheel 110, a first slide rail 140, and a second slide rail 150. The first slide rail 140 is fixed on the inner peripheral surface of the flywheel 110, the second slide rail 150 is detachably fixed on the rotating workpiece 170, and the first positioning fixture 160 is slidably disposed between the first slide rail 140 and the second slide rail 150. With the above structure, the movement track of the first positioning fixture 160 is simply and conveniently restricted.

[0075] In this embodiment, both the first slide rail 140 and the second slide rail 150 are cylindrical structures, and the inner peripheral surface of the first slide rail 140 and the outer peripheral surface of the second slide rail 150 respectively have installation guiding structures for restricting the moving direction of the same first positioning fixture 160. Since there are multiple first positioning fixtures 160 in this embodiment and they are circumferentially distributed on the outer peripheral side of the rotating workpiece 170, there are also multiple groups of installation guiding structures.

[0076] In some embodiments, the first slide rail 140 and the second slide rail 150 are slide rail assemblies for restricting both sides of the same first positioning fixture 160. There are multiple slide rail assemblies on the outer peripheral side of the rotating workpiece 170.

[0077] As Figure 2 shown, the rotating end 100 further includes a first fixed fixture 120. The first fixed fixture 120 is fixed to the flywheel 110, and the rotating workpiece 170 is detachably fixed to the first fixed fixture 120. One end of the elastic member 130 is connected to the first positioning fixture 160, and the other end of the elastic member 130 is connected to the first fixed fixture 120. In some embodiments, the other end of the elastic member 130 is connected to the flywheel 110. With the above connection method of the elastic member 130, it is convenient for the elastic member 130 to apply a force for axial movement to the first positioning fixture 160. The elastic member 130 is preferably a spring.

[0078] As Figure 2As shown, the mobile end 200 includes a second fixed fixture 210, a third slide rail 240, and a fourth slide rail 250. The third slide rail 240 is fixed to the inner circumferential surface of the second fixed fixture 210, the fourth slide rail 250 is detachably fixed to the moving workpiece 270, and the second positioning fixture 260 is slidably disposed between the third slide rail 240 and the fourth slide rail 250. With the above structure of the mobile end 200, the structure is simple and it is convenient to install and limit the second positioning fixture 260.

[0079] In this embodiment, both the third slide rail 240 and the fourth slide rail 250 are cylindrical structures, and the inner circumferential surface of the third slide rail 240 and the outer circumferential surface of the fourth slide rail 250 respectively have installation guiding structures that limit the moving direction of the same second positioning fixture 260. When the moving workpiece 270 moves, it will drive the fourth slide rail 250 to move together, but will not drive the second positioning fixture 260 to move. Since there are multiple second positioning fixtures 260 in this embodiment and they are circumferentially distributed on the outer peripheral side of the moving workpiece 270, there are also multiple groups of installation guiding structures.

[0080] In some embodiments, the third slide rail 240 and the fourth slide rail 250 are slide rail assemblies that limit both sides of the same second positioning fixture 260. There are multiple slide rail assemblies on the outer peripheral side of the moving workpiece 270.

[0081] In this embodiment, multiple first positioning fixtures 160 and second positioning fixtures 260 are provided simultaneously, which can provide a greater additional torque and further enhance the angular control accuracy of the inertia friction welding machine.

[0082] As Figure 2 shown, the mobile end 200 further includes a first driving mechanism 220, and the first driving mechanism 220 is used to drive the moving workpiece 270 to move towards the rotating workpiece 170.

[0083] In this embodiment, the first driving mechanism 220 is a hydraulic telescopic mechanism. The hydraulic rod of the hydraulic telescopic mechanism abuts against the moving workpiece 270, and the hydraulic cylinder of the hydraulic telescopic mechanism drives the hydraulic rod to make the moving workpiece 270 move towards the rotating workpiece 170.

[0084] As Figure 2 shown, the mobile end 200 further includes a second driving mechanism 230, and the second driving mechanism 230 is used to drive the second positioning fixture 260 to move towards the first positioning fixture 160.

[0085] In this embodiment, the second driving mechanism 230 is also a hydraulic telescopic mechanism. The hydraulic rod of the hydraulic telescopic mechanism abuts against the rear end of the second positioning fixture 260, and the hydraulic cylinder of the hydraulic telescopic mechanism drives the hydraulic rod to make the second positioning fixture 260 move towards the first positioning fixture 160.

[0086] In order to further understand the technical solution of the present invention, the working process of the inertia friction welding machine of the present invention is described below.

[0087] Press the components of the rotating end 100 Figure 2 The inertia friction welding machine shown is clamped: the rotating workpiece 170 is loaded into the first fixing fixture 120, the rotating workpiece 170 is connected to the first positioning fixture 160 through the second slide rail 150, the flywheel 110 is clamped and fixed to the first fixing fixture 120, and the flywheel 110 is connected to the first positioning fixture 160 through the first slide rail 140, and the first fixing fixture 120 is connected to the first positioning fixture 160 through the elastic member 130, so that there is no relative movement between the rotating workpiece 170, the first fixing fixture 120, the flywheel 110, the first slide rail 140, and the second slide rail 150 to form a whole I, and the first positioning fixture 160 and the whole I can perform linear motion; there is no relative rotation between all components of the rotating end 100.

[0088] Press each component of the mobile terminal 200 Figure 2 The inertia friction welding machine shown is clamped: the mobile workpiece 270 is connected to the second positioning fixture 260 through the fourth slide rail 250, and the second positioning fixture 260 is connected to the second fixed fixture 210 through the third slide rail 240. The mobile workpiece 270 is supported in the welding direction by the pressure applied by the hydraulic rod driven by the hydraulic cylinder of the first driving mechanism 220, and the second positioning fixture 260 is supported by the pressure applied by the hydraulic rod of the hydraulic cylinder of the second driving mechanism 230. There is no relative rotation between all parts of the mobile end 200.

[0089] Adjust the rotating end 100 and the moving end 200 to keep the rotating workpiece 170 and the moving workpiece 270 coaxial. The motor of the inertia friction welding machine drives the flywheel 110 to rotate and drives the rotating end 100 to rotate to a set speed, that is, Figure 6 moving workpiece 270 under the action of the hydraulic rod of the first drive mechanism 220 toward the rotating end 100 and friction with the rotating workpiece 170, ie Figure 6 The hydraulic rod of the first driving mechanism 220 applies the upsetting pressure to the moving workpiece 270 and the rotating workpiece 170, that is, Figure 6 The second positioning fixture 260 moves toward the first positioning fixture 160 under the action of the hydraulic rod of the second driving mechanism 230, and causes the spring (elastic member 130) of the rotating end 100 to be compressed.

[0090] For the angular adjustment stage, the following is combined with Figure 7 The position changes of the first positioning fixture 160 and the second positioning fixture 260 during the angular positioning process are described. Figure 7The direction of the arrow in the figure is the direction of the additional torque. The first positioning fixture 160 and the second positioning fixture 260 move relative to each other under the action of pressure. When the second protrusion 262 of the second positioning fixture 260 is located in a certain first groove 161 of the first positioning fixture 160, the two positioning fixtures are in the first position ( Figure 7 Position 1 in the figure. At this time, the first protrusion 162 of the first positioning fixture 160 is also located in a certain second groove 261 of the second positioning fixture 260); when the second protrusion 262 of the second positioning fixture 260 is located at the intersection point of the first groove 161 and the first protrusion 162 of the first positioning fixture 160, the two positioning fixtures are in the second position ( Figure 7 Position 2 in the figure. At this time, the first protrusion 162 of the first positioning fixture 160 is also located at the intersection point of the second groove 261 and the first protrusion 162 of the second positioning fixture 260); when the second protrusion 262 of the second positioning fixture 260 passes over the top of the first groove 161 and abuts against the first protrusion 162 ( Figure 7 Position 3 in the figure. At this time, the first protrusion 162 of the first positioning fixture 160 also passes over the top of the second groove 261 and abuts against the second protrusion 262); when the second protrusion 262 of the second positioning fixture 260 is located in the next first groove 161 of the first positioning fixture 160, the two positioning fixtures are in the fourth position ( Figure 7 Position 4 in the figure. At this time, the first protrusion 162 of the first positioning fixture 160 is also located in the next second groove 261 of the second positioning fixture 260).

[0091] During the process of the first positioning fixture 160 and the second positioning fixture 260 moving from position 1 to position 3, the additional torque generated by the two positioning fixtures is opposite to the rotation direction of the rotating end 100, thereby further reducing the rotation speed of the rotating end 100; during the process of the first positioning fixture 160 and the second positioning fixture 260 moving from position 3 to position 4, the additional torque generated by the two positioning fixtures is the same as the rotation direction of the rotating end 100, thereby slightly increasing the rotation speed of the rotating end 100; when the rotation speed is high enough, the rotating end 100 can promote the two positioning fixtures to perform the reciprocating process from position 1 to position 3 and enter position 4; when the rotation speed is small and cannot break through position 2, the rotating end 100 makes a pendulum motion under the action of the additional torque, and finally the first positioning fixture 160 and the second positioning fixture 260 stay in the state of position 1. Since there is no relative rotation between the first positioning fixture 160 and the rotating workpiece 170, and there is no relative movement between the second positioning fixture 260 and the moving workpiece 270, the rotating workpiece 170 and the moving workpiece 270 maintain a set angle, that is Figure 6 In the angular adjustment stage. At this time, the hydraulic rod of the first driving mechanism 220 maintains a forging pressure on the moving workpiece 270 and the rotating workpiece 170, that is Figure 6 In the pressure holding stage, the welding is completed.

[0092] On the basis of ensuring that the welded joint has no impact, it should also be ensured that the final flywheel 110 can stay at the set angular position. Figure 3 The positioning fixture for angular positioning shown in the figure is a first positioning fixture 160 installed at the rotating end 100 and a second positioning fixture 260 installed at the moving end 200. The joint surface of the first positioning fixture 160 and the second positioning fixture 260 presents a circumferential direction. Figure 7 The sine curve distribution shown in FIG. 1 is a sine curve distribution, and the phase of the first positioning fixture 160 is exactly opposite to the phase of the second positioning fixture 260, so that the first positioning fixture 160 and the second positioning fixture 260 can be closely fitted. The two positioning fixtures are installed as shown in FIG. Figure 2 When the welding workpiece angular adjustment stage is entered, since the flywheel 110 still rotates at a relatively high speed, the contact point between the two positioning fixtures can be changed from Figure 7 The first positioning fixture 160 moves from position 1 to position 2, position 3, and position 4. At this time, the first positioning fixture 160 realizes reciprocating motion under the joint action of the spring (elastic member 130) and the second positioning fixture 260. When the speed of the flywheel 110 is low, the inertia of the flywheel 110 cannot move the contact point of the two positioning fixtures from position 1 to position 3. At this time, under the additional torque generated by the two positioning fixtures, the flywheel 110 and the rotating workpiece 170 start to move in the opposite direction. The rotating end 100 enters Figure 6 The enlarged figure shows the pendulum movement until the final position between the two positioning fixtures is Figure 7 The tightest fit is achieved in position 1, where the flywheel 110 stops at the angle matched in position 1. Due to the high-precision fit of the positioning fixture, high-precision angular control between the welding workpieces is ensured.

[0093] The welding process of the inertia friction welding machine of the present invention is further described below in conjunction with the welding process of conventional friction welding.

[0094] In conventional inertia friction welding processes, such as Figure 1 As shown, when the flywheel 110 reaches the set speed, the rotating workpiece 170 and the moving workpiece 270 rub against each other, and the speed of the flywheel 110 gradually decreases and stops under the action of the friction torque, and the angular position of the stop cannot be controlled. Since there is no relative motion between the flywheel 110 and the rotating workpiece 170, in order to control the stop position of the flywheel 110 (i.e., the rotating workpiece 170), the position of the flywheel 110 must be controlled by the angular positioning device before the flywheel 110 stops, thereby ensuring that the flywheel 110 stops at the set angle. Figure 6As shown, the inertia friction welding machine of the present invention adopts an angular positioning welding process. Compared with the traditional welding process, in the upsetting and pressure-holding stage, an angular adjustment stage is added. That is, when the rotational speed of the flywheel 110 is relatively low, the rotation of the flywheel 110 is intervened by the action of the angular positioning device (the first positioning fixture 160 and the second positioning fixture 260), and finally the flywheel 110 stops at the set position. As Figure 6 As shown in the enlarged view in

[0095] At the initial stage of the angular adjustment stage, the rotational speed of the flywheel 110 is still relatively large. At this time, the change in the rotational speed of the flywheel 110 is similar to that of the traditional welding process. When the rotational speed of the flywheel 110 (the rotating workpiece 170) is relatively low, the flywheel 110 starts to perform a pendulum motion, and the motion amplitude gradually decreases. This motion state can avoid the impact effect caused by rigid control such as using positioning pins, thereby ensuring the quality of the welded joint. Figure 6 At the end of the angular adjustment stage (i.e., the pendulum motion stage shown in the enlarged view in Figure 7 ), in order to ensure the angular accuracy, it is necessary to make the final matching position of the first positioning fixture 160 and the second positioning fixture 260 be the position 1 in

[0096] Therefore, it must be ensured that when the matching of the first positioning fixture 160 and the second positioning fixture 260 deviates, there is a large enough additional torque to drive the rotation of the rotating end 100. To ensure this effect, control needs to be carried out from the following two aspects:

[0097] First, reduce the internal friction of the entire inertia friction welding machine, especially the friction between the first positioning fixture 160 and the second positioning fixture 260. For example, smooth the mating surfaces of the first positioning fixture 160 and the second positioning fixture 260, or design the second positioning fixture 260 into a structure with sliding wheels to change the sliding friction into rolling friction;

[0098] Although the specific implementation manners of the present invention have been described above, those skilled in the art should understand that this is only an example. The protection scope of the present invention is defined by the appended claims. Without departing from the principles and essence of the present invention, those skilled in the art can make various changes or modifications to these implementation manners, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. An inertia friction welding machine, comprising a rotating end and a moving end, wherein the rotating end is used for clamping a rotating workpiece, and the moving end is used for clamping a moving workpiece, characterized in that, The inertia friction welding machine further includes a first positioning fixture and a second positioning fixture. The first positioning fixture is disposed on the rotating end, and is configured to rotate synchronously with the rotating end and can only move axially along the rotating workpiece. The second positioning fixture is disposed on the mobile end and is configured to only move axially along the moving workpiece. An elastic member is provided on a side of the first positioning fixture away from the mobile end, and the elastic member is used to apply a force to the first positioning fixture to move in the direction of the mobile end. The end face of the first positioning fixture facing the second positioning fixture has a plurality of first grooves arranged at preset angular intervals in the circumferential direction. Second protrusions adapted to the first grooves are provided on the second positioning fixture. When the rotating end rotates, the second protrusions can enter from one first groove into another first groove. And / or, the end face of the second positioning fixture facing the first positioning fixture has a plurality of second grooves arranged at preset angular intervals in the circumferential direction. First protrusions adapted to the second grooves are provided on the first positioning fixture. When the rotating end rotates, the first protrusions can enter from one second groove into another second groove.

2. The inertia friction welding machine according to claim 1, wherein A first protrusion is formed between two adjacent first grooves, and a second protrusion is formed between two adjacent second grooves. The first protrusion and the second protrusion have the same structural size.

3. The inertia friction welding machine according to claim 1, wherein There are multiple first protrusions and / or second protrusions.

4. The inertia friction welding machine according to claim 1, characterized in that, The movement track of the second protrusion entering from one first groove into another first groove is in a sine curve structure. And / or, the movement track of the first protrusion entering from one second groove into another second groove is in a sine curve structure.

5. The inertia friction welding machine according to claim 1, characterized in that The first positioning fixture is disposed on the outer peripheral side of the rotating workpiece, and the second positioning fixture is disposed on the outer peripheral side of the moving workpiece.

6. The inertia friction welding machine according to claim 5, wherein The rotating end includes a flywheel, a first slide rail and a second slide rail. The first slide rail is fixed on the inner peripheral surface of the flywheel, and the second slide rail is detachably fixed on the rotating workpiece. The first positioning fixture is slidably disposed between the first slide rail and the second slide rail.

7. The inertia friction welding machine according to claim 6, characterized in that, The rotating end further includes a first fixing fixture, and the first fixing fixture is fixed to the flywheel. The rotating workpiece is detachably fixed to the first fixing fixture.

8. The inertia friction welding machine according to claim 7, wherein One end of the elastic member is connected to the first positioning fixture, and the other end of the elastic member is connected to the flywheel or the first fixing fixture.

9. The inertia friction welding machine according to claim 8, wherein, The mobile end includes a second fixing fixture, a third slide rail and a fourth slide rail. The third slide rail is fixed on the inner peripheral surface of the second fixing fixture, and the fourth slide rail is detachably fixed on the moving workpiece. The second positioning fixture is slidably disposed between the third slide rail and the fourth slide rail.

10. The inertia friction welding machine according to claim 9, wherein, The mobile end further includes a first driving mechanism for driving the moving workpiece to move in the direction of the rotating workpiece.

11. The inertia friction welding machine according to claim 9, wherein, The mobile end further includes a second driving mechanism for driving the second positioning fixture to move in the direction of the first positioning fixture.

12. The inertia friction welding machine according to claim 1, characterized in that, There are multiple first positioning fixtures and / or second positioning fixtures.

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