Double-shoulder wire-filling friction welding equipment and welding method

Abstract

The invention discloses a double-shoulder wire-filling friction welding device and a welding method. The device body comprises an upper stirring head and a lower stirring head. The upper stirring head comprises an upper frame, an upper shaft shoulder and an upper stirring needle. The upper shaft shoulder is movably connected to the bottom surface of the upper frame. The upper shaft shoulder is provided with a first through hole that vertically penetrates the upper and lower surfaces thereof. The upper stirring needle is inserted in the first through hole. The upper shaft shoulder is connected to a first motor through a transmission device. The top of the upper stirring needle is connected to a first lifting device. The lower stirring head comprises a lower frame, a lower shaft shoulder and a lower stirring needle. The lower shaft shoulder is movably connected to the top surface of the lower frame. The lower shaft shoulder is provided with a second through hole that vertically penetrates the upper and lower surfaces thereof. The lower stirring needle is inserted in the second through hole. The lower shaft shoulder is connected to a second motor through a transmission device. The bottom of the lower stirring needle is connected to a second lifting device. The welding device disclosed by the invention is used to weld workpieces, and has the advantages of uniform friction welding, firm welding, no keyhole, and the ability to process large-thickness workpieces.

Description

Technical Field

[0001] The invention relates to the field of welding, and in particular to a double-shoulder wire-filling friction welding device and a welding method. Background Art

[0002] At present, most people use traditional welding methods for filling welding. However, when welding workpieces using traditional methods, internal welding is difficult. If only the surface of the workpiece is welded, the connection between the parts is not strong enough and it is easy to fall off. At the same time, traditional welding methods easily leave welding marks on the surface and cannot meet customer needs. Conventional welding methods cannot be used for workpieces that are too thick. Summary of the invention

[0003] In view of the problems existing in the prior art, the present invention discloses a double-shoulder wire-filling friction welding device, which has a simple structure and is easy to operate. By using the device for friction welding, a good filling welding effect can be obtained.

[0004] The technical solution of the present invention is: a double-shoulder wire-filled friction welding device, comprising an upper stirring head and a lower stirring head correspondingly connected to a stir friction welding machine, the upper stirring head comprising an upper frame, an upper shoulder and an upper stirring needle, the upper shoulder being movably connected to the bottom surface of the upper frame, a first through hole longitudinally penetrating the upper and lower surfaces thereof is provided in the upper shoulder, the upper stirring needle is inserted in the first through hole, the upper shoulder is connected to the first motor through a transmission device, and the top of the upper stirring needle is connected to the first lifting device; the lower stirring head comprising a lower frame, a lower shoulder and a lower stirring needle, the lower shoulder being movably connected to the top surface of the lower frame, a second through hole longitudinally penetrating the upper and lower surfaces thereof is provided in the lower shoulder, the lower stirring needle is inserted in the second through hole, the lower shoulder is connected to the second motor through a transmission device, and the bottom of the lower stirring needle is connected to the second lifting device.

[0005] A clearance fit is adopted between the upper stirring needle and the upper shaft shoulder, and a clearance fit is adopted between the lower stirring needle and the lower shaft shoulder.

[0006] The diameter of the first through hole is equal to the diameter of the second through hole, and the central axis of the first through hole is collinear with the central axis of the second through hole in the vertical direction.

[0007] The diameter of the upper stirring pin is equal to the diameter of the lower stirring pin.

[0008] The upper shaft shoulder is mounted on the upper frame through a first bearing so that it can rotate freely, and the lower shaft shoulder is mounted on the lower frame through a second bearing so that it can rotate freely.

[0009] The upper shaft shoulder and the lower shaft shoulder are connected to the first motor and the second motor respectively through a chain transmission device.

[0010] A first transmission gear is provided on the outer side surface of the upper shaft shoulder, a first shaft gear is provided on the motor shaft of the first motor, and the first transmission gear and the first shaft gear are connected via a chain transmission; a second transmission gear is provided on the outer side surface of the lower shaft shoulder, a second shaft gear is provided on the motor shaft of the second motor, and the second transmission gear and the second shaft gear are connected via a chain transmission.

[0011] The first lifting device and the second lifting device can be cylinders, and the piston rods of the cylinders are connected to the stirring needle to achieve the longitudinal movement of the stirring needle.

[0012] The method for welding using the above-mentioned double-shoulder wire-filling friction welding device specifically includes the following steps:

[0013] A welding method of a double-shoulder wire-filling friction welding device, characterized in that it specifically comprises the following steps:

[0014] 1) Place the workpiece between the upper stirring head and the lower stirring head, with the upper shoulder and the lower shoulder pressed on the upper and lower ends of the workpiece respectively, and the upper stirring needle can pass through the hole to be filled;

[0015] 2) A cylindrical filler metal strip having a diameter adapted to the diameter of the second through hole and a length adapted to the thickness of the workpiece is placed in the second through hole, and the upper stirring needle moves downward under the action of the first lifting device until it passes through the hole to be filled and abuts against the top of the filler metal strip, and the lower stirring needle is supported under the filler metal strip, and the upper stirring needle and the lower stirring needle are tightly pressed against the upper and lower ends of the filler metal strip;

[0016] 3) The lower shoulder rotates at high speed under the action of the chain transmission device, so that the filler metal strip in the lower shoulder is in a thermoplastic state due to frictional heating;

[0017] 4) The upper stirring pin and the lower stirring pin move upward at the same time until the bottom of the upper stirring pin is flush with the bottom of the upper shaft shoulder, and the top of the lower stirring pin is flush with the top of the lower shaft shoulder, and at the same time, the filler metal strip in the thermoplastic state is pushed into the hole to be filled in the workpiece;

[0018] 5) The upper stirring head and the lower stirring head are pressed on the upper and lower ends of the workpiece as a whole and the pressure is maintained for a period of time;

[0019] 6) After the pressure holding is completed, the upper stirring head and the lower stirring head leave the workpiece surface at the same time to complete the welding.

[0020] The beneficial effects of the present invention are:

[0021] When the double-shoulder wire-filling friction welding equipment disclosed in the present invention is in use, the upper shoulder and the lower shoulder can both rotate at high speed, so that the filler metal strip pressed tightly between the upper stirring needle and the lower stirring needle can move relative to the inner wall of the shoulder, so that the outer periphery of the filler metal strip is evenly heated and enters a thermoplastic state. When processing workpieces with larger thickness, a better filling welding effect can be achieved between the filler metal strip and the workpiece. Since the friction welding method is adopted, the upper limit value of the joint connection strength is increased, and a keyhole-free joint can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a double-shaft shoulder wire-filling friction welding device;

[0023] Figure 2 To use Figure 1 The schematic diagram of the welding process of the double-shaft shoulder wire-filling friction welding device shown;

[0024] Among them, 1-upper stirring head, 2-lower stirring head, 3-filling metal strip;

[0025] 11-upper frame, 12-upper shaft shoulder, 13-upper stirring needle, 14-first through hole, 15-first motor, 16-first lifting device, 17-first bearing;

[0026] 21 - lower frame, 22 - lower shaft shoulder, 23 - lower stirring needle, 24 - second through hole, 25 - second motor, 26 - second lifting device, 27 - second bearing. DETAILED DESCRIPTION

[0027] The following examples further illustrate the content of the present invention, but should not be construed as limiting the present invention. Without departing from the essence of the present invention, modifications and substitutions made to the methods, steps or conditions of the present invention all fall within the scope of the present invention.

[0028] In order to improve the connection strength of the connection ends of the welding workpieces and avoid leaving welding marks on the surface, a double-shoulder wire-filled friction welding device is provided in this embodiment, including an upper stirring head 1 and a lower stirring head 2 correspondingly connected to the stir friction welding machine, the upper stirring head 1 includes an upper frame 11, an upper shoulder 12 and an upper stirring needle 13, the upper shoulder 12 is installed on the bottom surface of the upper frame 11 through a first bearing 17 so that it can rotate freely, the upper shoulder 12 is provided with a first through hole 14 which longitudinally passes through its upper and lower surfaces, the upper stirring needle 13 is inserted in the first through hole 14, and a clearance fit is adopted between the upper stirring needle 13 and the upper shoulder 12. The shoulder 12 is connected to the first motor 15 through a transmission device, and the top of the upper stirring needle 13 is connected to the first lifting device 16; the lower stirring head 2 includes a lower frame 21, a lower shoulder 22 and a lower stirring needle 23. The lower shoulder 22 is movably connected to the top surface of the lower frame 21 through a second bearing 27 so that it can rotate freely. A second through hole 24 is provided in the lower shoulder 22 which longitudinally passes through its upper and lower surfaces. The lower stirring needle 23 is inserted into the second through hole 24. A clearance fit is adopted between the lower stirring needle 23 and the lower shoulder 22. The lower shoulder 22 is connected to the second motor 25 through a transmission device, and the bottom of the lower stirring needle 23 is connected to the second lifting device 26.

[0029] The diameter of the first through hole 14 is equal to the diameter of the second through hole 24 , and the central axis of the first through hole 14 is collinear with the central axis of the second through hole 24 in the vertical direction.

[0030] The diameter of the upper stirring needle 13 is equal to the diameter of the lower stirring needle 23. When the shaft shoulder rotates, the upper stirring needle 13 and the lower stirring needle 23 do not rub against the inner wall of the through hole.

[0031] The upper shoulder 12 and the lower shoulder 22 are connected to the first motor 15 and the second motor 25 respectively through chain transmission devices. A first transmission gear is provided on the outer side of the upper shoulder 12, a first shaft gear is provided on the motor shaft of the first motor 15, and the first transmission gear and the first shaft gear are connected through chain transmission; a second transmission gear is provided on the outer side of the lower shoulder 22, a second shaft gear is provided on the motor shaft of the second motor 25, and the second transmission gear and the second shaft gear are connected through chain transmission.

[0032] The first lifting device 16 and the second lifting device 26 can be cylinders, and the piston rods of the cylinders are connected to the inner ends of the stirring needles to realize the longitudinal movement of the stirring needles; the lifting devices can also be ball screw driving devices, and the specific form of the lifting devices is not limited as long as they can play a lifting role.

[0033] The method for welding using the above-mentioned double-shoulder wire-filling friction welding device specifically includes the following steps:

[0034] 1. Place the workpiece between the upper stirring head 1 and the lower stirring head 2, with the upper shoulder 12 and the lower shoulder 22 pressed against the upper and lower ends of the workpiece respectively, and the upper stirring needle 13 can pass through the hole to be filled;

[0035] Second, a cylindrical filler metal strip 3 with a diameter that matches the diameter of the second through hole 24 and a length that matches the thickness of the workpiece is placed in the second through hole 24, and the upper stirring needle 13 moves downward under the action of the first lifting device 16 until it passes through the hole to be filled and abuts against the top of the filler metal strip 3, and the lower stirring needle 23 is supported under the filler metal strip 3, and the upper stirring needle 13 and the lower stirring needle 23 are pressed tightly against the upper and lower ends of the filler metal strip 3;

[0036] 3. The lower shoulder 22 rotates at a high speed under the action of the chain transmission device, so that the filler metal strip 3 in the lower shoulder 22 is in a thermoplastic state due to frictional heating; in order to enhance the friction coefficient between the filler metal strip 3 and the inner wall of the through hole, regular stripes are provided on the inner walls of the first through hole 14 and the second through hole 24.

[0037] Fourth, the upper stirring needle 13 and the lower stirring needle 23 move upward at the same time until the bottom of the upper stirring needle 13 is flush with the bottom of the upper shaft shoulder 12, and the top of the lower stirring needle 23 is flush with the top of the lower shaft shoulder 22, and at the same time, the filler metal strip 3 in the thermoplastic state is pushed into the hole to be filled in the workpiece;

[0038] 5. The upper stirring head 1 and the lower stirring head 2 are pressed onto the upper and lower ends of the workpiece as a whole and the pressure is maintained for a period of time;

[0039] 6. After the pressure holding is completed, the upper stirring head 1 and the lower stirring head 2 leave the workpiece surface at the same time to complete the welding.

[0040] The above shows and describes the basic principles, main features and advantages of the present invention. However, the above is only a specific embodiment of the present invention, and the technical features of the present invention are not limited thereto. Any other implementation methods derived by any technician in the field without departing from the technical solution of the present invention should be included in the patent scope of the present invention.

Claims

1. A welding method for a double-shoulder wire-filled friction welding device, characterized in that: The double-shoulder wire-filling friction welding device comprises an upper stirring head (1) and a lower stirring head (2) which are connected to the friction stir welding machine respectively. The upper stirring head (1) comprises an upper frame (11), an upper shaft shoulder (12) and an upper stirring needle (13). The upper shaft shoulder (12) is movably connected to the bottom surface of the upper frame (11). A first through hole (14) is provided in the upper shaft shoulder (12) which longitudinally passes through the upper and lower surfaces thereof. The upper stirring needle (13) is inserted into the first through hole (14). The upper shaft shoulder (12) is connected to a first motor (15) via a transmission device. The top of the stirring needle (13) is connected to the first lifting device (16); the lower stirring head (2) comprises a lower frame (21), a lower shaft shoulder (22) and a lower stirring needle (23); the lower shaft shoulder (22) is movably connected to the top surface of the lower frame (21); a second through hole (24) is provided in the lower shaft shoulder (22) and passes through the upper and lower surfaces thereof in the longitudinal direction; the lower stirring needle (23) is inserted into the second through hole (24); the lower shaft shoulder (22) is connected to the second motor (25) through a transmission device; and the bottom of the lower stirring needle (23) is connected to the second lifting device (26); The welding steps are as follows: 1) placing a workpiece between an upper stirring head (1) and a lower stirring head (2), with an upper shaft shoulder (12) and a lower shaft shoulder (22) respectively pressed on the upper and lower ends of the workpiece, and an upper stirring needle (13) being able to pass through the hole to be filled; 2) placing a cylindrical filler metal strip (3) having a diameter that matches the diameter of the second through hole (24) and a length that matches the thickness of the workpiece in the second through hole (24), wherein the upper stirring needle (13) moves downward under the action of the first lifting device (16) until it passes through the hole to be filled and abuts against the top of the filler metal strip (3), and the lower stirring needle (23) is supported below the filler metal strip (3), and the upper stirring needle (13) and the lower stirring needle (23) are tightly pressed against the upper and lower ends of the filler metal strip (3); 3) The lower shaft shoulder (22) rotates at a high speed under the action of the chain transmission device, so that the filler metal strip (3) in the lower shaft shoulder (22) is heated by friction and is in a thermoplastic state; 4) The upper stirring pin (13) and the lower stirring pin (23) move upward simultaneously until the bottom of the upper stirring pin (13) is flush with the bottom of the upper shaft shoulder (12), and the top of the lower stirring pin (23) is flush with the top of the lower shaft shoulder (22), and at the same time, the filler metal strip (3) in a thermoplastic state is pushed into the hole to be filled in the workpiece; 5) The upper stirring head (1) and the lower stirring head (2) are pressed onto the upper and lower ends of the workpiece as a whole and the pressure is maintained for a period of time; 6) After the pressure holding is completed, the upper stirring head (1) and the lower stirring head (2) leave the workpiece surface at the same time, completing the welding.

2. A welding method for a double-shoulder wire-filling friction welding device as claimed in claim 1, characterized in that: A clearance fit is adopted between the upper stirring needle (13) and the upper shaft shoulder (12), and a clearance fit is adopted between the lower stirring needle (23) and the lower shaft shoulder (22).

3. A welding method for a double-shoulder wire-filling friction welding device as claimed in claim 1, characterized in that: The diameter of the first through hole (14) is equal to the diameter of the second through hole (24), and the central axis of the first through hole (14) and the central axis of the second through hole (24) are collinear in the vertical direction.

4. A welding method for a double-shoulder wire-filling friction welding device as claimed in claim 1, characterized in that: The diameter of the upper stirring needle (13) is equal to the diameter of the lower stirring needle (23).

5. The welding method of the double-shoulder wire-filling friction welding equipment according to claim 1, characterized in that: The upper shaft shoulder (12) is mounted on the upper frame (11) via a first bearing (17) so that it can rotate freely, and the lower shaft shoulder (22) is mounted on the lower frame (21) via a second bearing (27) so that it can rotate freely.

6. A welding method for a double-shoulder wire-filling friction welding device as claimed in claim 1, characterized in that: The upper shaft shoulder (12) and the lower shaft shoulder (22) are respectively connected to the first motor (15) and the second motor (25) via chain transmission devices.

7. A welding method for a double-shoulder wire-filling friction welding device as claimed in claim 1, characterized in that: The first lifting device (16) and the second lifting device (26) are cylinders, and the piston rods of the cylinders are connected to the inner ends of the stirring needles to achieve longitudinal movement of the stirring needles.

8. A welding method for a double-shoulder wire-filling friction welding device as claimed in claim 6, characterized in that: A first transmission gear is provided on the outer side surface of the upper shaft shoulder (12), a first shaft gear is provided on the motor shaft of the first motor (15), and the first transmission gear and the first shaft gear are connected via a chain transmission; a second transmission gear is provided on the outer side surface of the lower shaft shoulder (22), a second shaft gear is provided on the motor shaft of the second motor (25), and the second transmission gear and the second shaft gear are connected via a chain transmission.

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