Friction stir spot welding mechanism

Abstract

The utility model relates to the field of friction stir spot welding, in particular to a friction stir spot welding mechanism which comprises a main shaft support, a stirring needle and an inner shaft shoulder, the stirring needle is rotatably connected with the main shaft support, the inner shaft shoulder is slidably connected with the main shaft support, the inner shaft shoulder is sleeved on the stirring needle, and a first lead screw is further arranged on the main shaft support. The first lead screw comprises a first screw rod and a first nut, the first screw rod is fixedly connected with the stirring needle, the first nut is fixedly connected with the main shaft support, the main shaft support is further provided with a second lead screw, the second lead screw comprises a second screw rod and a second nut, the second screw rod is fixedly connected with the inner shaft shoulder, and the second nut is fixedly connected with the main shaft support. In addition, the first lead screw and the second lead screw are arranged, so that the relative position between the stirring needle and the inner shaft shoulder can be adjusted, the position where the stirring needle shakes the minimum can be obtained through adjustment, and shaking of the stirring needle during friction stir welding machining is further reduced.

Description

Technical Field

[0001] The utility model relates to the field of friction stir spot welding, in particular to a friction stir spot welding mechanism. Background Art

[0002] Backfill Friction Stir Spot Welding (FSSW) is a new solid-phase joining technology invented by GKSS in Germany based on friction stir welding. Since the invention of backfill friction stir spot welding, this technology has received extensive attention and in-depth research, especially for aluminum alloy materials. Research institutions, schools and large companies around the world have conducted in-depth and detailed research and engineering application development on this technology, and it has been successfully applied in many industrial manufacturing fields.

[0003] Friction stir welding needs to be very stable. If the main shaft of friction stir welding shakes too much, it will cause the weld to be too large or not round enough, which will affect the structural strength and not meet the design expectations. Therefore, it is necessary to improve such a structure to overcome the above defects. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a stir friction spot welding mechanism, which is achieved through the following technical solutions:

[0005] A friction stir spot welding mechanism comprises a spindle support, a stirring needle and an inner shoulder, wherein the stirring needle is rotatably connected to the spindle support, the inner shoulder is slidably connected to the spindle support, and the inner shoulder is sleeved on the stirring needle. The spindle support is also provided with a first lead screw, which comprises a first screw and a first nut, the first screw is fixedly connected to the stirring needle, and the first nut is fixedly connected to the spindle support. The spindle support is also provided with a second lead screw, which comprises a second screw and a second nut, the second screw is fixedly connected to the inner shoulder, and the second nut is fixedly connected to the spindle support.

[0006] In the above technical scheme: the main shaft bracket is used to set up the remaining structures; the stirring needle is used to achieve stir friction spot welding through rotation; the inner shoulder is used to protect the stirring needle and improve the stability of the stirring needle during rotation; the first lead screw is used to achieve vertical movement of the stirring needle; the second lead screw is used to achieve vertical movement of the inner shoulder, thereby achieving adjustment of the relative position between the inner shoulder and the stirring needle.

[0007] The utility model is further configured as follows: a transmission shaft is also provided on the main shaft bracket, the transmission shaft is rotatably connected to the main shaft bracket, one end of the transmission shaft is provided with connecting teeth, the shaft end of the stirring needle is provided with connecting tooth grooves, and the connecting teeth are cooperatively connected with the connecting tooth grooves.

[0008] In the above technical solution: the transmission shaft is used to transmit power so that the stirring needle can rotate; the setting of the connecting teeth and the connecting tooth grooves enables the stirring needle to still cooperate with the transmission shaft after axial movement.

[0009] The utility model is further configured as follows: a first gear set is also provided on the main shaft support, the first gear set includes a first power tooth and a first transmission tooth, and the first transmission tooth is fixedly connected to the first screw of the first lead screw.

[0010] In the above technical solution: the first gear set is used to transmit power to the first screw.

[0011] The utility model is further configured as follows: a second gear set is also provided on the spindle support, the second gear set includes a second power tooth and a second transmission tooth, and the second transmission tooth is fixedly connected to the second screw rod of the second lead screw.

[0012] In the above technical solution: the second gear set is used to transmit power to the second lead screw.

[0013] The utility model is further configured as follows: a power motor is fixedly arranged on the main shaft bracket, a first power wheel is arranged on the output shaft of the power motor, a second power wheel is arranged on the transmission shaft, and the first power wheel and the second power wheel are connected by a belt.

[0014] In the above technical solution: the power motor is used to provide power to the stirring needle; the first power wheel and the second power wheel are used to transmit power.

[0015] The utility model is further configured as follows: a first control motor is fixedly arranged on the spindle bracket, and an output shaft of the first control motor is fixedly connected to the first power tooth.

[0016] In the above technical solution: the first control motor is used to provide power for the first lead screw.

[0017] The utility model is further configured as follows: a second control motor is fixedly arranged on the spindle bracket, and an output shaft of the second control motor is fixedly connected to the second power tooth.

[0018] In the above technical solution: the second control motor is used to provide power for the second lead screw.

[0019] The utility model is further configured as follows: an outer shaft shoulder is further provided on the main shaft support, a clearance hole is provided through the middle of the outer shaft shoulder, and the inner shaft shoulder and the stirring needle both pass through the clearance hole.

[0020] In the above technical solution: the outer shoulder plays a protective role to prevent the stirring needle and the inner shoulder from being bumped when not processed.

[0021] The utility model discloses a stir friction spot welding mechanism, compared with the prior art:

[0022] 1. The utility model reduces the slippage of the stirring needle during rotation by setting an inner shoulder, thereby avoiding the welding point being too large and not conforming to the design, which affects the structural strength;

[0023] 2. The utility model also sets a first screw and a second screw so that the relative position between the stirring needle and the inner shoulder can be adjusted, so that the position where the stirring needle shakes the least can be obtained through adjustment, thereby further reducing the shaking of the stirring needle during stir friction welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional diagram of the utility model;

[0025] Figure 2 It is a schematic diagram of the internal structure of the utility model;

[0026] Figure 3 It is a cross-sectional view of the utility model.

[0027] The corresponding component names represented by the numbers and letters in the figure are: 10-spindle bracket; 20-stirring needle; 201-connecting tooth groove; 30-inner shoulder; 40-first lead screw; 401-first screw; 402-first nut; 50-second lead screw; 501-second screw; 502-second nut; 60-transmission shaft; 601-connecting tooth; 602-second power wheel; 70-first gear set; 701-first power tooth; 702-first transmission tooth; 80-second gear set; 801-second power tooth; 802-second transmission tooth; 90-power motor; 901-first power wheel; 110-first control motor; 120-second control motor; 130-outer shoulder; 1301-clearance hole. DETAILED DESCRIPTION

[0028] The following is a detailed description of an embodiment of the utility model. This embodiment is implemented on the premise of the technical solution of the utility model, and a detailed implementation method and a specific operation process are given, but the protection scope of the utility model is not limited to the following embodiment.

[0029] like Figure 1-3As shown, a friction stir spot welding mechanism proposed by the utility model includes a spindle support 10, a stirring needle 20 and an inner shoulder 30, the stirring needle 20 is rotatably connected to the spindle support 10, the inner shoulder 30 is slidably connected to the spindle support 10, and the inner shoulder 30 is sleeved on the stirring needle 20, and the spindle support 10 is also provided with a first lead screw 40, the first lead screw 40 includes a first screw 401 and a first nut 402, the first screw 401 is fixedly connected to the stirring needle 20, and the first nut 402 is fixedly connected to the spindle support 10, and the spindle support 10 is also provided with a second lead screw 50, the second lead screw 50 includes a second screw 501 and a second nut 502, the second screw 501 is fixedly connected to the inner shoulder 30, and the second nut 502 is fixedly connected to the spindle support 10. Among them, the central axes of the stirring needle 20 and the inner shoulder 30 coincide with each other; a pattern is provided on the outer wall of the end of the stirring needle 20 to improve the efficiency of stir friction spot welding; the first screw 401 is hollow in the middle, and the stirring needle 20 passes through the hollow position in the middle of the first screw 401 and is connected to it through a ball bearing; the second screw 501 of the second lead screw 50 is hollow in the middle, and the inner shoulder 30 passes through the center position of the second screw 501 and is connected to it through a ball bearing.

[0030] like Figure 1-3 As shown, the friction stir spot welding mechanism proposed by the utility model, the main shaft support 10 is also provided with a transmission shaft 60, the transmission shaft is rotatably connected with the main shaft support 10, one end of the transmission shaft 60 is provided with a connecting tooth 601, the shaft end of the stirring needle 20 is provided with a connecting tooth groove 201, and the connecting tooth 601 is matched and connected with the connecting tooth groove 201. Among them, the depth of the connecting tooth groove 201 is greater than the maximum distance that the stirring needle 20 can move axially.

[0031] like Figure 1-3 As shown, the utility model proposes a stir friction spot welding mechanism, the spindle bracket 10 is also provided with a first gear set 70, the first gear set 70 includes a first power tooth 701 and a first transmission tooth 702, and the first transmission tooth 702 is fixedly connected to the first screw 401 of the first screw 40.

[0032] like Figure 1-3 As shown, the utility model proposes a stir friction spot welding mechanism, the spindle bracket 10 is also provided with a second gear set 80, the second gear set 80 includes a second power tooth 801 and a second transmission tooth 802, and the second transmission tooth 802 is fixedly connected to the second screw 501 of the second lead screw 50.

[0033] like Figure 1-3As shown, the utility model proposes a stir friction spot welding mechanism, the main shaft bracket 10 is also fixedly provided with a power motor 90, the output shaft of the power motor 90 is provided with a first power wheel 901, the transmission shaft 60 is provided with a second power wheel 602, and the first power wheel 901 and the second power wheel 602 are connected by a belt.

[0034] like Figure 1-3 As shown, in the friction stir spot welding mechanism proposed by the present invention, a first control motor 110 is fixedly arranged on the spindle support 10 , and the output shaft of the first control motor 110 is fixedly connected to the first power tooth 701 .

[0035] like Figure 1-3 As shown, in a friction stir spot welding mechanism proposed by the present invention, a second control motor 120 is fixedly arranged on the spindle support 10 , and an output shaft of the second control motor 120 is fixedly connected to the second power tooth 801 .

[0036] like Figure 1-3 As shown, the friction stir spot welding mechanism proposed by the utility model, the spindle support 10 is also provided with an outer shoulder 130, the middle of the outer shoulder 130 is provided with a clearance hole 1301, the inner shoulder 30 and the stirring needle 20 both pass through the clearance hole 1301. The diameter of the clearance hole is greater than the outer diameter of the inner shoulder.

[0037] The working principle of the utility model is:

[0038] a) When performing friction stir spot welding;

[0039] b) the first adjustment motor and the second adjustment motor rotate;

[0040] c) changing the position of the stirring needle and the inner shoulder;

[0041] d) The power motor rotates, causing the stirring needle to rotate;

[0042] e) The stirring needle is in contact with the workpiece to be subjected to friction stir spot welding;

[0043] f) realizing friction stir spot welding;

[0044] g) If the weld spot is large after processing, adjust the position of the inner shoulder so that the inner shoulder moves downward a certain distance.

[0045] The above are only preferred specific implementation methods of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the utility model, who makes equivalent replacements or changes based on the technical scheme and utility model concept of the utility model, should be covered by the protection scope of the utility model.

[0046] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. A friction stir spot welding mechanism, characterized in that: The invention comprises a main shaft support (10), a stirring needle (20) and an inner shoulder (30), wherein the stirring needle (20) is rotatably connected to the main shaft support (10), the inner shoulder (30) is slidably connected to the main shaft support (10), and the inner shoulder (30) is sleeved on the stirring needle (20). The main shaft support (10) is also provided with a first lead screw (40), wherein the first lead screw (40) comprises a first screw rod (401) and a first nut (402). The first screw (401) is fixedly connected to the stirring needle (20), the first nut (402) is fixedly connected to the main shaft support (10), and a second screw (50) is also provided on the main shaft support (10), the second screw (50) includes a second screw (501) and a second nut (502), the second screw (501) is fixedly connected to the inner shoulder (30), and the second nut (502) is fixedly connected to the main shaft support (10).

2. A friction stir spot welding mechanism according to claim 1, characterized in that: A transmission shaft (60) is also provided on the main shaft support (10), and the transmission shaft (60) is rotatably connected to the main shaft support (10). One end of the transmission shaft (60) is provided with a connecting tooth (601), and the shaft end of the stirring needle (20) is provided with a connecting tooth groove (201), and the connecting tooth (601) is cooperatively connected with the connecting tooth groove (201).

3. A friction stir spot welding mechanism according to claim 2, characterized in that: The spindle support (10) is also provided with a first gear set (70), the first gear set (70) comprising a first power tooth (701) and a first transmission tooth (702), the first transmission tooth (702) being fixedly connected to the first screw rod (401) of the first lead screw (40).

4. A friction stir spot welding mechanism according to claim 3, characterized in that: The spindle support (10) is also provided with a second gear set (80), the second gear set (80) comprising a second power tooth (801) and a second transmission tooth (802), the second transmission tooth (802) being fixedly connected to the second screw rod (501) of the second lead screw (50).

5. A friction stir spot welding mechanism according to claim 4, characterized in that: A power motor (90) is also fixedly arranged on the main shaft support (10), a first power wheel (901) is arranged on the output shaft of the power motor (90), a second power wheel (602) is arranged on the transmission shaft (60), and the first power wheel (901) and the second power wheel (602) are connected by a belt.

6. A friction stir spot welding mechanism according to claim 5, characterized in that: A first control motor (110) is also fixedly arranged on the spindle support (10), and an output shaft of the first control motor (110) is fixedly connected to the first power tooth (701).

7. A friction stir spot welding mechanism according to claim 6, characterized in that: A second control motor (120) is also fixedly arranged on the spindle support (10), and an output shaft of the second control motor (120) is fixedly connected to the second power tooth (801).

8. A friction stir spot welding mechanism according to claim 7, characterized in that: The spindle support (10) is also provided with an outer shoulder (130), and a clearance hole (1301) is provided through the middle of the outer shoulder (130), and the inner shoulder (30) and the stirring needle (20) both pass through the clearance hole (1301).

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