Constant-pressure welding device of stirring cutter

Abstract

The utility model discloses a constant-pressure welding device for a stirring cutter. The constant-pressure welding device comprises a positioning seat, a welding mechanism and a pressure detection mechanism, the pressure detection mechanism and the welding mechanism are installed on the front side and the rear side of the positioning base correspondingly. The pressure detection mechanism comprises an up-down driving source mounted on the positioning seat, a connecting block mounted at the output end of the up-down driving source in an up-down moving manner, a guide wheel mounted at the lower end of the connecting block, and a pressure sensor mounted at the top of the connecting block and used for being matched with the positioning seat; the welding mechanism comprises a stirring head which is in transmission connection with a driving motor and is correspondingly matched with the guide wheel; the guide wheels and the stirring heads are arranged at intervals. By means of the welding mechanism and the pressure detection mechanism which are matched with each other, the actual pressure value borne by the pressure sensor is not prone to being affected by factors such as the temperature of a welding area, the rigidity of a product and the welding speed, and therefore the welding effect is more perfect.

Description

Technical Field

[0001] The utility model relates to the technical field of stirring cutters, in particular to a constant pressure welding device for stirring cutters. Background Art

[0002] The basic principle of friction stir welding is: a high-speed rotating stirring head is inserted into the workpiece to be welded and moves along the welding direction. The friction heat generated by the stirring head and the contact part causes the workpiece to be partially plasticized. The plasticized material forms a dense solid phase weld under the action of stirring and extrusion.

[0003] Among them, for the stirring tool, application publication number CN109551098A discloses a floating constant pressure controlled friction stir welding device, which specifically discloses a ball spline, a spline shaft, a coil, a permanent magnet, a force sensor, a tool handle, and a stirring tool; the coil and the permanent magnet are respectively installed on the ball spline end cover and the spline shaft, the force sensor is connected to the coil, the stirring tool is connected to the spline shaft through the tool handle, the spline shaft cooperates with the ball spline, and the ball spline is connected to the spindle motor.

[0004] However, the above floating constant pressure control friction stir welding device still has some disadvantages, for example: the floating constant pressure control friction stir welding device is specifically through the stirring tool after piercing into the workpiece surface, so that the force sensor can detect the magnitude of the axial pressure in real time during welding. When welding the weld with an uneven surface, when the weld is higher than the reference plane, the gap H between the coil and the permanent magnet decreases, the force sensor measures the increase of the electromagnetic force and feeds back to the control system, the control system reduces the coil current value, so that the electromagnetic force decreases, thereby reducing the axial pressure to the set value; on the contrary, when the weld is lower than the reference plane, the gap H between the coil and the permanent magnet increases, so that the axial pressure decreases, and the control system increases the coil current value to keep the axial pressure constant. Although the above design can use electrical signals to adjust the pressure of the stirring tool on the workpiece. However, since the stirring tool will be affected by factors such as the temperature of the welding area, the rigidity of the product and the speed of welding when it is in the welding area, the actual pressure value transmitted to the force sensor by the stirring tool through the coil and the permanent magnet may not be accurate, which leads to the actual welding effect is not perfect enough.

[0005] Therefore, it is necessary to improve the existing technology. Utility Model Content

[0006] In view of the problems existing in the above-mentioned prior art, the purpose of the utility model is to provide a constant pressure welding device for a stirring tool, which can make the actual pressure value received by the pressure sensor not easily affected by factors such as the temperature of the welding area, the rigidity of the product and the welding speed, thereby making the welding effect more perfect.

[0007] In order to achieve the above purpose, the technical solution of the utility model is:

[0008] A constant pressure welding device for a stirring tool, comprising a positioning seat, a welding mechanism and a pressure detection mechanism; the pressure detection mechanism and the welding mechanism are respectively installed on the front and rear sides of the positioning seat; the pressure detection mechanism comprises an upper and lower driving source installed on the positioning seat, a connecting block movably installed on the output end of the upper and lower driving source, a guide wheel installed at the lower end of the connecting block, and a pressure sensor installed on the top of the connecting block and used to cooperate with the positioning seat; the welding mechanism comprises a stirring head for transmission connection with a driving motor and correspondingly cooperating with the guide wheel; the guide wheel is arranged at an interval with the stirring head; the pressure sensor is electrically connected to an industrial control system, and the connecting block can make the pressure sensor feel a pressure greater than or less than a preset pressure value by lifting and lowering, and the industrial control system can use a driving mechanism to control the welding mechanism and the pressure detection mechanism to rise and fall accordingly according to the different pressures applied to the pressure sensor, so that the pressure value felt by the pressure sensor is maintained at a preset value.

[0009] Furthermore, a guide mechanism is included; the guide mechanism includes a slider vertically mounted on the positioning seat and a slide rail mounted on the slider movably up and down and connected to the connecting block on the outside. The above arrangement can improve the stability of the connecting block when it moves.

[0010] Furthermore, two sliding blocks are provided, which are distributed up and down, so as to improve the stability of the connecting block when moving.

[0011] Furthermore, the up and down driving source is a cylinder.

[0012] Furthermore, the welding mechanism also includes a machine head; the machine head is installed on the positioning seat, and the stirring head is installed at the lower end of the machine head.

[0013] Furthermore, a mounting notch is provided on the rear side of the positioning seat, and the machine head is correspondingly embedded in the mounting notch and fixed to the positioning seat by screws, so that the machine head can be conveniently installed by utilizing the mounting notch.

[0014] Furthermore, the connection block is in an "L" shape, and the guide wheel is installed at the outer end of the bottom of the connection block.

[0015] Furthermore, when the pressure sensor senses that the pressure value increases, the industrial control system controls the welding mechanism and the pressure detection mechanism to move upward; when the pressure sensor senses that the pressure value decreases, the industrial control system controls the welding mechanism and the pressure detection mechanism to move downward.

[0016] The beneficial effects of the utility model are:

[0017] The utility model sets a guide wheel and a pressure sensor that cooperate with each other, and the guide wheel is located in front of the stirring head, so that the guide wheel can continuously fit with the part of the workpiece that has not been stirred by the stirring head. In this way, when the guide wheel encounters an uneven workpiece surface, the guide wheel can accurately use the connecting block to allow the pressure sensor to feel a pressure greater than or less than a preset pressure value on the positioning seat, so that the industrial control system controls the welding mechanism and the pressure detection mechanism to achieve corresponding lifting and lowering. When the welding mechanism and the pressure detection mechanism complete the corresponding lifting and lowering, the pressure felt by the pressure sensor can be maintained at the preset value to achieve constant pressure. Therefore, the use of the guide wheel, the connecting block, the pressure sensor and the positioning seat can prevent the welding part from being inaccurate or unstable due to changes in temperature and the like, and then the preset pressure value will not be affected by factors such as the temperature of the welding area, the rigidity of the product and the welding speed, resulting in inaccurate pressure, so that the welding effect is more perfect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 It is a cross-sectional view of a local structure of the utility model;

[0020] Figure 3 It is a schematic diagram of the utility model when in use.

[0021] Reference numerals

[0022] 1. Positioning seat; 2. Welding mechanism; 21. Stirring head; 22. Machine head; 23. Installation notch; 3. Pressure detection mechanism; 31. Upper and lower driving sources; 32. Connecting block; 33. Guide wheel; 34. Pressure sensor; 4. Guide mechanism; 41. Slide rail; 42. Slider; 5. Welding seam; 6. Workpiece. DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments. The following description is only exemplary and does not limit the protection scope of the utility model.

[0024] Embodiment 1:

[0025] like Figure 1-Figure 3As shown, a constant pressure welding device for a stirring tool comprises a positioning seat 1, a welding mechanism 2 and a pressure detection mechanism 3; the pressure detection mechanism 3 and the welding mechanism 2 are respectively mounted on the front and rear sides of the positioning seat 1; the pressure detection mechanism 3 comprises an upper and lower driving source 31 mounted on the positioning seat 1, a connecting block 32 mounted on the output end of the upper and lower driving source 31 movably mounted up and down, a guide wheel 33 mounted at the lower end of the connecting block 32, and a pressure sensor 34 mounted on the top of the connecting block 32 and used to cooperate with the positioning seat 1; the welding mechanism 2 comprises a stirring head 21 for transmission connection with a driving motor (not shown in the figure) and correspondingly matched with the guide wheel 33; the guide wheel 33 is arranged at intervals from the stirring head 21; the pressure sensor 34 is electrically connected to the industrial control system, and the connecting block 32 can make the pressure sensor 34 feel a pressure greater than or less than a preset pressure value by lifting and lowering, and the industrial control system can use a driving mechanism (not shown in the figure) to control the welding mechanism 2 and the pressure detection mechanism 3 to rise and fall accordingly according to the different pressures received by the pressure sensor 34, so that the pressure value felt by the pressure sensor 34 is maintained at the preset value.

[0026] The constant pressure welding device of the stirring tool also includes a guide mechanism 4; the guide mechanism 4 includes a slider 42 vertically mounted on the positioning seat 1 and a slide rail 41 mounted on the slider 42 movably up and down and connected to the connecting block 32 on the outside. The slide rail 41 and the slider 42 provided by the guide mechanism 4 can ensure the stability of the connecting block 32 during the up and down movement, and further ensure the stability of the pressure sensor 34. Specifically, when the connecting block 32 moves up and down, the slide rail 41 can be synchronously driven to move on the slider 42, so as to improve the stability of the connecting block 32.

[0027] In this embodiment, two sliders 42 are provided, which are distributed up and down, so as to further improve the stability of the connecting block 32 when moving.

[0028] In this embodiment, the up and down driving source 31 is a cylinder, so that the connecting block 32 and the guide wheel 33 can be driven to rise and fall conveniently and quickly.

[0029] The welding mechanism 2 further comprises a machine head 22 ; the machine head 22 is mounted on the positioning seat 1 , and the stirring head 21 is mounted at the lower end of the machine head 22 .

[0030] A mounting notch 23 is provided on the rear side of the positioning seat 1 , and the machine head 22 is correspondingly embedded in the mounting notch 23 and fixed to the positioning seat 1 by screws, so that the machine head 22 can be conveniently installed using the mounting notch 23 , and then the mixing head 21 can be conveniently installed.

[0031] In this embodiment, the connection block 32 is approximately in an “L” shape, and the guide wheel 33 is installed at the outer end position of the bottom of the connection block 32 .

[0032] In this embodiment, when the pressure sensor 34 senses that the pressure value is increasing, the industrial control system controls the welding mechanism 2 and the pressure detection mechanism 3 to move upward to reduce the pressure on the pressure sensor 34; when the pressure sensor 34 senses that the pressure value is decreasing, the industrial control system controls the welding mechanism 2 and the pressure detection mechanism 3 to move downward to increase the pressure on the pressure sensor 34.

[0033] Embodiment 2:

[0034] like Figure 1-Figure 3 As shown, the utility model also provides a constant pressure welding method for a stirring tool, comprising the following steps:

[0035] S1. After the workpiece 6 to be welded is placed on the workbench, the driving motor drives the stirring head 21 to start and the driving mechanism drives the welding mechanism 2 and the pressure detection mechanism 3 to descend. The stirring head 21 is inserted into the preset position of the weld 5 of the workpiece 6. The upper and lower driving sources 31 drive the guide wheel 33 to continue to descend and fit on the surface of the workpiece 6.

[0036] S2, during welding, the welding mechanism 2 and the pressure detection mechanism 3 move forward along the weld 5 at a set welding speed;

[0037] S3. When the guide wheel 33 located in front of the stirring head 21 encounters a place where the surface of the workpiece 6 is not in consistent height, the pressure sensed by the guide wheel 33 at this position changes. The guide wheel 33 cooperates with the pressure sensor 34 and the positioning seat 1 to make the pressure sensor 34 feel the change in pressure value and transmit the data of the pressure value change to the industrial control system. The industrial control system uses the driving mechanism to adjust the upper and lower heights of the welding mechanism 2 and the pressure detection mechanism 3 according to the change in pressure value, so that the pressure value sensed by the pressure sensor 34 is maintained at a preset value, that is, to achieve constant pressure; of course, when the welding mechanism 2 and the pressure detection mechanism 3 are raised and lowered, the positioning seat 1 will also be raised and lowered accordingly; specifically, the driving mechanism can drive the welding mechanism 2 to rise and fall by connecting to the machine head 22 or the driving motor, and when the welding mechanism 2 is raised and lowered, it will synchronously drive the pressure detection mechanism 3 to rise and fall through the positioning seat 1; of course, the driving mechanism can also be directly connected to the positioning seat 1;

[0038] S4, after the stirring head 21 reaches the end point of the weld 5, the driving mechanism drives the welding mechanism 2 and the pressure detection mechanism 3 to rise to the preset position and causes the stirring head 21 to pull out the workpiece 6; the stirring head 21 stops rotating after pulling out the workpiece 6; the upper and lower driving sources 31 drive the guide wheel 33 to continue to rise to the preset position;

[0039] S5. Take away the welded workpiece.

[0040] In step S3, when the guide wheel 33 located in front of the stirring head 21 encounters a raised position on the surface of the workpiece 6, the pressure sensed by the guide wheel 33 at this position becomes larger and the connecting block 32 is used to make the pressure sensor 34 tend to move upward on the positioning seat 1, so that the pressure sensor 34 can feel the increase in the pressure value and transmit the change data of the pressure value to the industrial control system. The industrial control system uses the driving mechanism to adjust the height of the welding mechanism 2 and the pressure detection mechanism 3 upward according to the change of the pressure value to reduce the pressure felt by the pressure sensor 34, so that the pressure value felt by the pressure sensor 34 can be maintained at a preset value, that is, a constant pressure. Specifically, when the guide wheel 33 encounters a protrusion during the welding process, that is, it is subjected to excessive pressure, it will be pressed upward through the connecting block 32, so that the output shaft of the upper and lower driving source 31 of the cylinder will shrink slightly, so that the pressure sensor 34 at the top of the connecting block 32 will press upward on the positioning seat 1, that is, the pressure on the pressure sensor 34 will increase.

[0041] When the guide wheel 33 located in front of the stirring head 21 encounters a concave position on the surface of the workpiece 6, the pressure sensed by the guide wheel 33 at this position becomes smaller and the connecting block 32 is used to make the pressure sensor 34 tend to move downward on the positioning seat 1, so that the pressure sensor 34 can feel the decrease in pressure value and transmit the change data of the pressure value to the industrial control system. The industrial control system uses the driving mechanism to adjust the height of the welding mechanism 2 and the pressure detection mechanism 3 downward according to the change of the pressure value to increase the pressure felt by the pressure sensor 34, so that the pressure value felt by the pressure sensor 34 can be maintained at a preset value, that is, to maintain a constant pressure. Specifically, when the guide wheel 33 encounters a depression during the welding process, that is, the pressure received becomes smaller, in order to keep the guide wheel 33 in contact with the surface of the workpiece, the output shaft of the upper and lower drive source 31 and the connecting block 32 will be extended downward, that is, the output shaft of the upper and lower drive source 31 of the cylinder will be extended, so that the pressure sensor 34 at the top of the connecting block 32 will move slightly below the positioning seat 1, that is, the pressure received by the pressure sensor 34 will be reduced.

[0042] In summary, the utility model sets a guide wheel 33 and a pressure sensor 34 that cooperate with each other, and the guide wheel 33 is located in front of the stirring head 21, so that the guide wheel 33 can continuously fit with the part of the workpiece that has not been stirred by the stirring head 21. In this way, when the guide wheel 33 encounters an uneven workpiece surface, the guide wheel 33 can accurately use the connecting block 32 to allow the pressure sensor 34 to feel a pressure greater than or less than the preset pressure value on the positioning seat 1, so that the industrial control system controls the welding mechanism 2 and the pressure detection mechanism 3 to achieve corresponding lifting and lowering. When the welding mechanism 2 and the pressure detection mechanism 3 complete the corresponding lifting and lowering, the pressure felt by the pressure sensor 34 can be maintained at the preset value to achieve constant pressure. Therefore, the use of the guide wheel 33, the connecting block 32, the pressure sensor 34 and the positioning seat 1 can prevent the welding part from being inaccurate or unstable due to changes in temperature and other factors, and then the preset pressure value will not be affected by factors such as the temperature of the welding area, the rigidity of the product and the speed of welding, resulting in inaccurate pressure, so that the welding effect is more perfect.

[0043] The present invention is not limited to the above-mentioned embodiments. If various changes or modifications to the present invention do not depart from the spirit and scope of the present invention, and if these changes and modifications fall within the claims of the present invention and the scope of equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. A constant pressure welding device for a stirring tool, characterized in that: It comprises a positioning seat, a welding mechanism and a pressure detection mechanism; the pressure detection mechanism and the welding mechanism are respectively installed on the front and rear sides of the positioning seat; the pressure detection mechanism comprises an upper and lower driving source installed on the positioning seat, a connecting block movably installed on the output end of the upper and lower driving source, a guide wheel installed at the lower end of the connecting block, and a pressure sensor installed on the top of the connecting block and used to cooperate with the positioning seat; the welding mechanism comprises a stirring head used for transmission connection with a driving motor and correspondingly matched with the guide wheel; the guide wheel and the stirring head are arranged at intervals; The pressure sensor is electrically connected to the industrial control system. The connection block can be raised and lowered to enable the pressure sensor to sense a pressure greater than or less than a preset pressure value. The industrial control system can use a driving mechanism to control the welding mechanism and the pressure detection mechanism to rise and fall accordingly according to the different pressures applied to the pressure sensor, so that the pressure value sensed by the pressure sensor is maintained at a preset value.

2. The constant pressure welding device for a stirring tool according to claim 1, characterized in that: It also includes a guiding mechanism; the guiding mechanism includes a sliding block vertically mounted on the positioning seat and a sliding rail mounted on the sliding block movably up and down and connected to the connecting block on the outer side.

3. The constant pressure welding device for a stirring tool according to claim 2, characterized in that: The sliding blocks are provided with two upper and lower distributed ones.

4. The constant pressure welding device for a stirring tool according to claim 1, characterized in that: The up and down driving source is a cylinder.

5. The constant pressure welding device for a stirring tool according to claim 1, characterized in that: The welding mechanism further comprises a machine head; the machine head is mounted on the positioning seat, and the stirring head is mounted at the lower end of the machine head.

6. The constant pressure welding device for a stirring tool according to claim 5, characterized in that: A mounting notch is arranged on the rear side of the positioning seat, and the machine head is correspondingly embedded in the mounting notch and fixed to the positioning seat by screws.

7. The constant pressure welding device for a stirring tool according to claim 1, characterized in that: The connecting block is in an "L" shape, and the guide wheel is installed at the outer end of the bottom of the connecting block.

8. The constant pressure welding device for a stirring tool according to claim 1, characterized in that: When the pressure sensor senses that the pressure value becomes larger, the industrial control system controls the welding mechanism and the pressure detection mechanism to move upward; When the pressure sensor senses that the pressure value becomes smaller, the industrial control system controls the welding mechanism and the pressure detection mechanism to move downward.

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