A device for synchronously and precisely removing friction stir welding flash

Abstract

The present invention relates to the technical field of friction stir welding, and particularly to a device for synchronously and precisely removing the flash of friction stir welding. The device includes a bracket, a driving component and a milling component. The bracket is installed on the spindle housing of the friction stir welding machine. The milling component is rotatably connected to the bracket, and a through hole for the stirring head of the friction stir welding machine to pass through is provided at the center of the milling component. The milling component is connected to the tool holder of the friction stir welding machine through the driving component. The stirring head is driven to perform friction stir welding by rotating the tool holder, and at the same time, the milling component is driven to mill the flash by the driving component. In the present invention, the stirring head is driven to perform friction stir welding by rotating the tool holder, and at the same time, the milling component is driven to mill the flash by the driving component. The flash removal action is synchronized with the welding action of the stirring head, so as to realize the removal of the flash of linear welds and planar two-dimensional welds. At the same time, it is ensured that the milling end face of the milling component is parallel to the weld surface, without being affected by the variable angle of the stirring head, thus avoiding milling the surface of the workpiece.

Description

Technical Field

[0001] The present invention relates to the technical field of friction stir welding, and particularly to a device for synchronously and precisely removing the flash of friction stir welding. Background Art

[0002] As an advanced solid-phase connection technology, friction stir welding has the advantages of low heat input during welding, no pollution during the welding process, and small post-welding deformation compared with ordinary fusion welding, and has obvious advantages for welding light metals such as aluminum alloys and magnesium alloys. Friction stir welding realizes connection by the extrusion and friction of the welding seam metal by the stirring head and the heat generated by the plastic deformation of the metal itself. During welding, there is an included angle of 2.5° between the stirring head and the vertical direction of the workpiece. During the extrusion, stirring, and friction of the metal by the stirring head, a small part of the metal overflows from both sides of the shoulder of the stirring head and adheres to the base metal to form flash.

[0003] The flash of friction stir welding has an irregular shape and protrudes from the surface of the welding seam and the base material, affecting the beauty of the welding seam and seriously affecting the flatness and surface finish of the weld area of the part. At present, there are mainly three ways to remove the flash of friction stir welding. The first is to add a step of milling the surface of the welding seam after the welding process of the part is completed. This way of removing the flash increases the manufacturing process of the part, prolongs the manufacturing cycle, and has a large cost investment. The second is to use a following mechanism to remove the flash on the surface of the welding seam. Usually, a flash removal mechanism is installed at the rear side of the friction stir welding head. This mechanism needs to be installed and fixed separately and driven separately, with a large space size. The straight-line distance between the center line of the flash removal milling cutter and the center line of the stirring head is usually more than 150 mm. It cannot mill the flat welding seam with a large arc and cannot remove the flash of two-dimensional plane welding. Because the flash removal mechanism is located at a certain position at the rear side of the stirring head, when the welding is completed, the flash removal mechanism and the stirring head are lifted together and leave the workpiece, resulting in the flash of the last 150 mm of the welding seam not being removed. The third is to fix the flash removal mechanism on the stirring head, and the stirring head drives the flash removal mechanism to rotate coaxially. The advantage of this mechanism is that the space size is small, and the disadvantage is that the flash removal mechanism and the stirring head are coaxial. The axis of the flash removal mechanism has an included angle of 2.5° with the vertical direction of the workpiece, resulting in a 2.5-degree included angle between the milling surface and the surface of the part. While precisely milling the flash, the surface of the welding seam is milled and damaged, and it cannot be used for finish machining. The milling cutter is fitted and installed with the stirring head, which is not conducive to chip removal and is prone to tool sticking. Summary of the Invention

[0004] (1) Technical Problems to be Solved

[0005] The embodiment of the present invention provides a device for synchronously and precisely removing the flash of friction stir welding, which solves the technical problems of difficult removal of the flash of existing friction stir welding and unsatisfactory removal effect.

[0006] (2) Technical Solutions

[0007] An embodiment of the present invention provides a device for synchronously and precisely removing the flash of friction stir welding, comprising: a bracket, a driving component, and a milling component. The bracket is installed on the spindle housing of the friction stir welding machine. The milling component is rotatably connected to the bracket, and a through hole for the stirring head of the friction stir welding machine to pass through is provided at the center of the milling component. The milling component is connected to the tool shank of the friction stir welding machine through the driving component. The stirring head is driven to perform friction stir welding by rotating the tool shank, and at the same time, the milling component is driven by the driving component to mill the flash.

[0008] Further, the driving component adopts a constant velocity joint. The inner ring of the constant velocity joint is fixedly connected to the tool shank, and the outer ring of the constant velocity joint is fixedly connected to the milling component. The variable-angle and constant-speed rotation of the tool shank and the milling component is realized through the constant velocity joint.

[0009] Further, the axis of the tool shank forms an angle of 2.5° with the center line of the milling component.

[0010] Further, an inner hole bearing is provided between the bracket and the milling component.

[0011] Further, the milling component includes a tool mounting bracket and a milling cutter, and the milling cutter is arranged at the bottom of the tool mounting bracket.

[0012] Further, the milling cutter is assembled on the jaws of the tool mounting bracket through a pull stud. The jaws are mounted on a pull rod, and the tool is clamped by a hydraulic component at one end of the pull rod.

[0013] Further, the milling cutter adopts a triangular milling insert.

[0014] Further, the stirring head is connected to the tool shank by a double key drive method, and the upper region of the stirring head is axially fixed to the tool shank through a snap ring.

[0015] (3) Beneficial effects

[0016] In summary, in the present invention, the rotation of the tool holder drives the stirring head to perform friction stir welding, and at the same time, the driving component drives the milling component to mill the flash. The flash removal action is synchronized with the welding action of the stirring head, realizing the removal of the flash for linear welds and planar two-dimensional welds. The un-milled length of the last weld is shortened to within 25 mm. At the same time, it is ensured that the milling end face of the milling component is parallel to the weld surface, without being affected by the variable angle of the stirring head, avoiding milling the surface of the workpiece, and enabling high-precision flash milling with an accuracy of 0.01 mm. The present invention has the advantages of small size, high precision, and high synchronization. Through its characteristic of variable angle synchronous transmission, the welding and milling composite operation can be completed in one step, reducing the processing procedures of the product, shortening the manufacturing time, and reducing the manufacturing cost. It can be applied to the processing and manufacturing of various types of parts such as battery trays, water-cooled plates, and train wall panels, solving the problems that are difficult to manufacture by conventional manufacturing processes and have too high manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 is an installation schematic diagram of a synchronous and precise friction stir welding flash removal device according to an embodiment of the present invention;

[0019] Figure 2 is a structural schematic diagram of a synchronous and precise friction stir welding flash removal device according to an embodiment of the present invention;

[0020] Figure 3 is a partial schematic diagram of a synchronous and precise friction stir welding flash removal device according to an embodiment of the present invention;

[0021] In the figure: 1, bracket; 2, driving component; 3, milling component; 4, spindle housing; 5, stirring head; 6, tool holder; 7, inner hole bearing; 8, tool mounting rack; 9, milling cutter. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following further describes in detail the embodiments of the present invention in conjunction with the drawings and embodiments. The detailed description and drawings of the following embodiments are used to exemplarily illustrate the principles of the present invention, but cannot be used to limit the scope of the present invention, that is, the present invention is not limited to the described embodiments, and covers any modifications, replacements, and improvements of parts, components, and connection methods without departing from the spirit of the present invention.

[0023] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following will describe the present application in detail with reference to the drawings and in combination with the embodiments.

[0024] Please refer to Figures 1 to 3 , an embodiment of the present invention provides a device for synchronously and precisely removing the flash of friction stir welding, including: a bracket 1, a driving component 2, and a milling component 3. The bracket 1 is installed on the spindle housing 4 of the friction stir welding machine, and is fixedly installed without rotational movement. The outer contour surface of the bracket 1 is coaxial with the tool holder 6. The milling component 3 is rotatably connected to the bracket 1, that is, the milling component 3 can rotate relative to the bracket 1, and a through hole for the stirring head 5 of the friction stir welding machine to pass through is provided at the center of the milling component 3 to avoid mutual movement interference between the milling component 3 and the stirring head 5, and at the same time facilitate the variable angle setting of the stirring head 5. The milling component 3 is connected to the tool holder 6 of the friction stir welding machine through the driving component 2. The stirring head 5 is driven to perform friction stir welding by rotating the tool holder 6, and at the same time, the milling component 3 is driven to mill the flash by the driving component 2.

[0025] In the present invention, the stirring head 5 is driven to perform friction stir welding by rotating the tool holder 6, and at the same time, the milling component 3 is driven to mill the flash by the driving component 2. The flash removal action is synchronized with the welding action of the stirring head 5, so as to realize the removal of the flash of linear welds and planar two-dimensional welds. The un-milled length of the end weld is shortened to within 25 mm. At the same time, it is ensured that the milling end face of the milling component 3 is parallel to the weld surface, and is not affected by the variable angle of the stirring head 5, avoiding milling the surface of the workpiece, and high-precision flash milling with an accuracy of 0.01 mm can be realized. The present invention has the advantages of small volume, high precision, high synchronism, etc. Through its characteristics of variable angle synchronous transmission, the welding and milling composite operation can be completed in one step, reducing the processing procedures of the product, shortening the manufacturing time, and reducing the manufacturing cost. It can be applied to the processing and manufacturing of various types of parts such as battery trays, water-cooled plates, and train wall panels, solving the problems that are difficult to manufacture by conventional manufacturing processes and the manufacturing cost is too high.

[0026] In some embodiments, the driving component 2 adopts a constant velocity joint. The inner ring of the constant velocity joint is fixedly connected to the tool shank 6, and the outer ring of the constant velocity joint is fixedly connected to the milling component 3. The variable-angle and constant-speed rotation of the tool shank 6 and the milling component 3 is realized through the constant velocity joint. The constant velocity joint is connected to the main and driven shafts through the outer ring of the constant velocity joint, the star-shaped inner ring, and the cage respectively. The centers of the force-transmitting steel balls are all located in the plane passing through the center of the coupling and are installed in the raceways composed of the spherical outer ring and the spherical outer surface grooves of the star-shaped inner ring. The centers of the two spherical surfaces coincide with the center of the universal coupling. To ensure that the centers of all steel balls are on the bisecting plane of the angle between the two shaft axes, the steel balls are installed in the windows of the cage. Therefore, when the angle between the main and driven shafts of the coupling changes, the force-transmitting point can always be located on the bisecting line of the angle. Therefore, the rotational speeds between the main and driven shafts of the constant velocity joint can be kept synchronous.

[0027] In some embodiments, the axis of the tool shank 6 forms an angle of 2.5° with the center line of the milling component 3.

[0028] In some embodiments, an inner hole bearing 7 is provided between the bracket 1 and the milling component 3, which can reduce the friction force of the milling component 3 rotating relative to the bracket 1.

[0029] In some embodiments, the milling component 3 includes a tool mounting bracket 8 and a milling cutter 9. The milling cutter 9 is arranged at the bottom of the tool mounting bracket 8 and is used for milling the flash. Further, the milling cutter 9 is assembled on the claws of the tool mounting bracket 8 through a pull stud. The claws are installed on a pull rod, and the tool is clamped by a hydraulic component at one end of the pull rod. When different products are welded, according to the processing accuracy and clamping condition state of the welded products, it is necessary to adjust the welding penetration of the stirring head 5, which results in different vertical distances between the shoulder of the stirring head 5 and the weld surface when different products are welded. The milling depth of the milling cutter 9 can be adjusted by adjusting the position of the pull stud to complete the precise milling of the flash of friction stir welding, and the adjustment accuracy can reach 0.01 mm. Different materials and different chip removal grooves of the milling cutter 9 can be replaced according to the actual material of the welded parts to complete the synchronous milling of the flash of friction stir welding.

[0030] In some embodiments, the milling cutter 9 adopts triangular milling cutter inserts. The contact area between the milling cutter 9 and the flash metal is small, which can effectively prevent tool sticking.

[0031] In some embodiments, the stirring head 5 is connected to the tool shank 6 by a double-key drive, and the upper region of the stirring head 5 is axially fixed to the tool shank 6 by a snap ring. In a conventional friction stir welding device, the stirring head 5 is connected to the tool shank 6 by a side-fixed setscrew. Since the bracket 1 is located outside the tool shank 6 and the stirring head 5, the setscrew cannot be installed and locked. Therefore, the stirring head 5 is connected to the tool shank 6 by a double-key drive to achieve rotational movement. The upper region of the stirring head 5 is axially fixed to the tool shank 6 by a snap ring to prevent the stirring head 5 from falling.

[0032] Before welding, understand the material, machining accuracy, and clamping state of the welded parts, formulate the welding process, determine a reasonable penetration amount, and adjust the height of the milling cutter 9 according to the welding penetration amount. After welding starts, the stirring head 5 and the milling component 3 rotate synchronously at high speed. The machine head drives the stirring head 5 and the milling component 3 to move vertically downward. The shoulder contacts the weld surface, and the milling cutter 9 is slightly higher than the weld surface. The stirring head 5 moves along the weld direction to achieve welding. The milling cutter 9 advances along the welding direction together with the stirring head 5 to achieve milling during welding. After welding is completed, the machine head drives the stirring head 5 and the milling component 3 to move vertically upward, and the welding and milling composite process is completed.

[0033] Embodiment:

[0034] The shoulder of the stirring head 5 is 12 mm, and the pin length is 3 mm. The workpiece to be welded is a 3-mm-thick aluminum alloy plate, and the weld is a planar two-dimensional weld. The rotational speed of the tool shank 6 is 1200 RPM, the welding speed is 200 mm / min, the welding penetration amount is 0.1 mm, and the vertical distance between the milling cutter 9 and the stirring head 5 is 0.15 mm.

[0035] During welding, the milling component 3 rotates synchronously at high speed with the stirring head 5. The machine head drives the stirring head 5 and the milling component 3 to plunge. After the shoulder of the stirring head 5 contacts the part surface, the cutter head of the milling cutter 9 is slightly higher than the surface of the workpiece to be welded. The machine head advances along the welding direction at a speed of 200 mm / min, and the welding and flash removal processes are carried out simultaneously. After welding is completed, the stirring head 5 and the milling component 3 are lifted as a whole, and the tool shank 6 stops. After the welding and milling composite processing, the surface of the workpiece to be welded is flat, and the length of the end flash is 23 mm.

[0036] It should be clear that the various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other, and the key points of each embodiment are the differences from other embodiments. For the method embodiments, the relevant parts can refer to the partial description of the device embodiments. The present invention is not limited to the specific steps and structures described above and shown in the figures. And, for the sake of brevity, the detailed description of known method technologies is omitted here.

[0037] The above are only embodiments of the present application and do not limit the present application. For those skilled in the art, various modifications and variations can be made to the present application without departing from the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A synchronous precision device for removing friction stir welding flash, characterized in that Including: A bracket, a driving component, and a milling component. The bracket is mounted on the spindle housing of a friction stir welding machine. The milling component is rotatably connected to the bracket, and a through hole for the stirring head of the friction stir welding machine to pass through is provided at the center of the milling component. The milling component is connected to the tool shank of the friction stir welding machine through the driving component. The stirring head is driven to perform friction stir welding by rotating the tool shank, and at the same time, the milling component is driven by the driving component to mill the flash. The driving component uses a constant velocity joint. The inner ring of the constant velocity joint is fixedly connected to the tool shank, and the outer ring of the constant velocity joint is fixedly connected to the milling component. The constant velocity joint realizes the variable-angle and constant-speed rotation between the tool shank and the milling component.

2. The synchronous precision flash removal device for friction stir welding according to claim 1, wherein The axis of the tool shank forms an angle of 2.5° with the center line of the milling component.

3. A device for synchronously and precisely removing the flash of friction stir welding according to claim 1, characterized in that, An inner hole bearing is provided between the bracket and the milling component.

4. A device for synchronously and precisely removing flash in friction stir welding according to claim 1, characterized in that, The milling component includes a tool mounting bracket and a milling cutter, and the milling cutter is arranged at the bottom of the tool mounting bracket.

5. A synchronous and precise device for removing flash in friction stir welding according to claim 4, characterized in that, The milling cutter is assembled on the claw of the tool mounting bracket through a pull stud. The claw is mounted on a pull rod, and the tool is clamped by a hydraulic component at one end of the pull rod.

6. The synchronous precision flash removal device for friction stir welding according to claim 5, wherein, The milling cutter uses a triangular milling insert.

7. A synchronous and precise friction stir welding flash removal device according to any one of claims 1 to 6, characterized in that, The stirring head is connected to the tool shank by a double key drive method, and the upper region of the stirring head is axially fixed to the tool shank through a snap ring.

Images