Static shaft shoulder mechanism of friction stir welding machine

Abstract

The utility model discloses a static shaft shoulder mechanism of a friction stir welding machine. The static shaft shoulder mechanism comprises a static shaft shoulder, a stirring head and a sliding bearing, a through hole penetrating through the upper end and the lower end of the static shaft shoulder is formed in the middle of the static shaft shoulder; the stirring head comprises a head part and a stirring main body which are sequentially connected from bottom to top; the lower end of the stirring main body penetrates through the through hole, and a gap is reserved between the outer wall of the stirring main body and the side wall of the through hole; the head part downwards protrudes out of the bottom surface of the static shaft shoulder; the sliding bearing comprises a straight cylindrical bearing main body and a positioning ring connected to the peripheral outer wall of the top of the bearing main body; the bearing main body is mounted in the through hole and sleeves the stirring main body; the outer wall of the bearing main body is attached to the side wall of the through hole, and the inner wall of the bearing main body is attached to the outer wall of the stirring main body; and the positioning ring is connected to the top surface of the static shaft shoulder. By arranging the sliding bearing capable of limiting the stirring head, friction between the stirring head and the static shaft shoulder is prevented, and normal functions and the service life of the static shaft shoulder can be guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of friction stir welding machines, and particularly to a stationary shoulder mechanism of a friction stir welding machine. Background Art

[0002] Stationary shoulder friction stir welding is a new type of friction stir welding technology. Since the stationary shoulder does not rotate with the stirring tool during the welding process, the heat input is relatively small, which is suitable for materials with low thermal conductivity. And the leveling effect of the stationary shoulder can make the weld surface flat and smooth.

[0003] For the stationary shoulder friction stir welding tool, the authorized announcement number CN109202266B discloses a stationary shoulder friction stir welding tool that is beneficial to discharging seepage material. Specifically, it discloses including a stirring tool and a stationary shoulder; the stirring tool includes a head, a cylindrical section above the head, and a conical section above the cylindrical section. The center of the stationary shoulder has a cylindrical stepped hole for accommodating the stirring tool. The diameter of the upper section of the stepped hole is larger than that of the lower section. The lower section of the stepped hole of the stationary shoulder accommodates the cylindrical section of the stirring tool, and the upper section of the stepped hole of the stationary shoulder accommodates the conical section of the stirring tool. The lower part of the conical section of the stirring tool has a convex structure. There is a gap between the lower end surface of the convex structure and the stepped surface of the stationary shoulder. The gap communicates with the gap between the cylindrical section of the stirring tool and the lower section of the stepped hole of the stationary shoulder. The stationary shoulder has a seepage material discharge hole communicating with the gap. The outer side of the convex structure is close to but does not contact the stationary shoulder, and the size of the distance therebetween should not affect the movement of the stirring tool and can prevent the seepage material from surging. The gap, the clearance, and the seepage material discharge hole together form a discharge channel for the seepage material; a step of nearly 90 degrees is machined on the lower section of the cylindrical section of the convex structure, and a gap with a nearly rectangular longitudinal section is formed between the step surface and the stepped surface of the stationary shoulder. The inner side of the gap with a nearly rectangular longitudinal section is flush with the outer surface of the cylindrical section above the head of the stirring tool.

[0004] However, for the above-mentioned stationary shoulder friction stir welding tool, there is still room for improvement. For example: Since the lower section of the stepped hole on the stationary shoulder is used to accommodate the cylindrical section of the stirring tool. However, during the rotation and advancement of the stirring tool, it will be jointly affected by the axial pressure generated by the equipment mechanism and the advancement pressure generated during advancement. As a result, it is very easy for the center of gravity of the stirring tool to shift backward, leading to uneven stress on the cylindrical section of the stirring tool, and further causing serious friction between the lower section of the stepped hole of the stationary shoulder and the stirring head during the welding process, and ultimately resulting in severe wear of the lower section of the stepped hole of the stationary shoulder, causing the function of the stationary shoulder to fail and the service life to be greatly reduced.

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

[0006] Aiming at the problems existing in the above-mentioned prior art, the purpose of the present utility model is to provide a stationary shoulder mechanism for a friction stir welding machine, which can limit the position of the stirring head by using a sliding bearing, so that the center of the stirring head is not easily shifted backward, thereby avoiding friction between the stirring head and the stationary shoulder, that is, it can ensure the normal function and service life of the stationary shoulder.

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

[0008] A stationary shoulder mechanism for a friction stir welding machine includes a stationary shoulder, a stirring head and a sliding bearing; a through hole penetrating the upper and lower ends of the stationary shoulder is provided in the middle of the stationary shoulder; the stirring head includes a head and a stirring body connected in sequence from bottom to top; the lower end of the stirring body is inserted into the through hole and there is a gap between the outer wall of the stirring body and the side wall of the through hole; the head protrudes downward from the bottom surface of the stationary shoulder; the sliding bearing includes a bearing body in the shape of a straight cylinder and a positioning ring connected to the outer walls around the top of the bearing body; the bearing body is installed in the through hole and is sleeved on the stirring body in a matching manner; the outer wall of the bearing body is attached to the side wall of the through hole and the inner wall of the bearing body is attached to the outer wall of the stirring body; the positioning ring is connected to the top surface of the stationary shoulder. Through the above settings, the sliding bearing can be used to limit the position of the stirring head to prevent the stirring head from rubbing against the side wall of the through hole, resulting in severe wear of the lower opening of the through hole, thereby ensuring the normal function and service life of the stationary shoulder.

[0009] Further, the through hole includes a first cylindrical section, a conical section and a second cylindrical section with gradually decreasing widths from top to bottom; the lower end of the stirring body is placed in the second cylindrical section.

[0010] Further, the gap between the first cylindrical section and the stirring body is greater than the gap between the third cylindrical section and the stirring body; the gap between the conical section and the stirring body is greater than the gap between the third cylindrical section and the stirring body.

[0011] Further, the length of the bearing body is less than the length of the first cylindrical section.

[0012] Further, a main chip removal hole penetrating the outer wall and the inner wall of the stationary shoulder and used for discharging waste chips is also provided on the stationary shoulder; the main chip removal hole is close to the lower opening of the through hole. Through the above settings, it is convenient to discharge chips.

[0013] Further, a secondary chip removal hole penetrating the outer wall and the inner wall of the stationary shoulder and used for discharging waste chips is also provided on the stationary shoulder; the secondary chip removal hole is higher than the main chip removal hole. Through the above settings, the chip removal effect can be improved.

[0014] Further, there are two secondary chip removal holes, and the two secondary chip removal holes are respectively located on both sides of the static shaft shoulder, so as to further enhance the chip removal effect.

[0015] Further, the sliding bearing is a powder metallurgical sliding bearing.

[0016] Further, the top surface and the bottom surface of the static shaft shoulder are both flat surfaces.

[0017] Further, the positioning ring and the top surface of the static shaft shoulder are locked by bolts, so as to facilitate the disassembly and assembly of the sliding bearing.

[0018] The beneficial effects of the present utility model are as follows:

[0019] By providing a sliding bearing and using the sliding bearing to limit the mixing head, that is, to perform center correction, the center of the mixing head is not easily shifted backward when the mixing head is subjected to the dual pressures of the axial pressure of the equipment head and the traveling pressure during traveling. Thus, it is possible to avoid the mixing head from rubbing against the side wall of the perforation, resulting in serious wear at the lower opening of the perforation. That is, this design can keep the function of the static shaft shoulder normal and ensure the service life; at the same time, this design can also avoid the friction with the static shaft shoulder and affect the normal rotation of the mixing head. Description of the Drawings

[0020] Figure 1 is the schematic diagram of the overall structure of the present utility model Figure 1 ;

[0021] Figure 2 is the schematic diagram of the overall structure of the present utility model Figure 2 ;

[0022] Figure 3 is Figure 2 the cross-sectional view along A-A in

[0023] Figure 4 is the schematic structural diagram of the static shaft shoulder of the present utility model;

[0024] Figure 5 is the longitudinal sectional view of the static shaft shoulder of the present utility model.

[0025] Reference Signs

[0026] 1. Static shaft shoulder; 11. Perforation; 111. First cylindrical section; 112. Conical section; 113. Second cylindrical section; 12. Main chip removal hole; 121. Secondary chip removal hole; 13. Outer edge; 2. Mixing head; 21. Head; 22. Mixing main body; 3. Sliding bearing; 31. Bearing main body; 32. Positioning ring; 4. Gap. Specific Embodiments

[0027] The following further elaborates on the utility model in conjunction with the accompanying drawings and specific embodiments. The following description is merely exemplary and does not limit the protection scope of the utility model.

[0028] As Figures 1 - 5 shown, a stationary shoulder mechanism of a friction stir welding machine includes a stationary shoulder 1, a stirring head 2, and a sliding bearing 3; a through hole 11 penetrating the upper and lower ends of the stationary shoulder 1 is provided in the middle of the stationary shoulder 1; the stirring head 2 includes a head 21 and a stirring body 22 connected in sequence from bottom to top; the lower end of the stirring body 22 is inserted into the through hole 11 and a gap 4 is left between the outer wall of the stirring body 22 and the side wall of the through hole 11; the head 21 protrudes downward from the bottom surface of the stationary shoulder 1; the sliding bearing 3 includes a bearing main body 31 in a straight cylindrical shape and a positioning ring 32 connected to the outer walls around the top of the bearing main body 31; the bearing main body 31 is installed in the through hole 11 and is sleeved on the stirring body 22 in a matching manner; the outer wall of the bearing main body 31 is in contact with the side wall of the through hole 11 and the inner wall of the bearing main body 31 is in contact with the outer wall of the stirring body 22; the positioning ring 32 is connected to the top surface of the stationary shoulder 1.

[0029] Therefore, the utility model limits the stirring head 2 by setting the sliding bearing 3, that is, performs center correction. Thus, when the stirring head 2 is subjected to the dual pressures of the axial pressure of the equipment head and the traveling pressure during traveling, the center of the stirring head 2 is not easily shifted backward, thereby avoiding friction between the stirring head 2 and the side wall of the through hole 11 and resulting in severe wear of the lower end opening of the through hole 11. That is to say, this design can keep the function of the stationary shoulder 1 normal and ensure the service life; at the same time, this design can also avoid affecting the normal rotation of the stirring head 2 due to friction with the stationary shoulder 1.

[0030] As Figure 3 shown, for the specific shape of the through hole 11, it can be set as the following shape: the through hole 11 includes a first cylindrical section 111, a tapered section 112, and a second cylindrical section 113 with gradually decreasing widths from top to bottom; the lower end of the stirring body 22 is placed in the second cylindrical section 113. However, those skilled in the art should know that for the shape of the through hole 11, it can also be correspondingly deformed as long as there is a certain gap 4 between its side wall and the stirring body 22.

[0031] As Figure 3 shown, specifically, for the stirring body 22, it can also be divided into a first stirring cylindrical section (not marked in the figure), a stirring tapered section (not marked in the figure), and a second stirring cylindrical section (not marked in the figure) from top to bottom. Among them, the second stirring cylindrical section is placed in the second cylindrical section 113 of the through hole 11.

[0032] As Figure 3As shown, specifically, the gap 4 between the first cylindrical section 111 and the stirring main body 22 is greater than the gap 4 between the third cylindrical section and the stirring main body 22; the gap 4 between the conical section 112 and the stirring main body 22 is greater than the gap 4 between the third cylindrical section and the stirring main body 22.

[0033] Regarding the size of the gap 4, it should be set within a suitable range. If the gap is too small, there will be friction between the stirring head 2 and the stationary shoulder 1, which not only easily damages the stationary shoulder 1 but also easily affects the normal rotation of the stirring head 2; if the gap is too large, when the stirring head 2 rotates in the material, too much material will easily flow into the gap 4, which not only easily affects the normal rotation of the stirring head 2 but also easily causes the center of the stirring head 2 to shift and ultimately leads to wear of the stirring head 2, thus affecting the welding quality.

[0034] As Figure 3 shown, specifically, the length of the bearing main body 31 is less than the length of the first cylindrical section 111. Of course, those skilled in the art should know that for the length of the bearing main body 31, it can also be appropriately extended or shortened according to actual needs, and no specific limitation is made here.

[0035] As Figure 1 、 Figure 4 and Figure 5 shown, preferably, a main chip removal hole 12 that penetrates the outer wall and the inner wall of the stationary shoulder 1 and can be used to discharge waste chips is further provided on the stationary shoulder 1; in addition, the main chip removal hole 12 is open at the lower end close to the perforation 11. For the main chip removal hole 12, when the stirring main body 22 performs friction stirring, the generated chips (such as aluminum chips) first enter the perforation 11 through the gap 4 and then are discharged outward through the main chip removal hole 12.

[0036] As Figure 1 、 Figure 4 and Figure 5 shown, in order to enhance the chip removal effect, a secondary chip removal hole 121 that penetrates the outer wall and the inner wall of the stationary shoulder 1 and can be used to discharge waste chips is further provided on the stationary shoulder 1; the position of the secondary chip removal hole 121 is higher than that of the main chip removal hole 12. By providing the secondary chip removal hole 121, the chips that cannot be completely discharged by the main chip removal hole 12 will be assisted in chip removal through the secondary chip removal hole 121 again, that is, the cooperation of the two chip removal holes ensures the chip removal effect.

[0037] As Figure 1 、 Figure 4 and Figure 5 shown, in order to further enhance the chip removal effect, two secondary chip removal holes 121 are provided and the two secondary chip removal holes 121 are symmetrically located on both sides of the stationary shoulder 1 respectively. At the same time, the size of the secondary chip removal hole 121 can be selected to be larger than the size of the main chip removal hole 12.

[0038] Preferably, the sliding bearing 3 can be a powder metallurgy sliding bearing. For powder metallurgy sliding bearings, due to their self-lubricating performance, high precision, low production cost, environmental friendliness, etc., they can be widely used in various equipment in various industries, including friction stir welding machines. Their various advantages can enable them to exhibit unique technical advantages and economic benefits.

[0039] As Figures 1 - 3 shown, in this embodiment, the top surface and the bottom surface of the stationary shoulder 1 are both flat. Therefore, since the top surface of the stationary shoulder 1 is flat, it can be stably connected to the positioning ring 32.

[0040] Specifically, the positioning ring 32 and the top surface of the stationary shoulder 1 can be locked by bolts, which makes the sliding bearing easy to disassemble and assemble. Additionally, if necessary, for the sliding bearing 3, the positioning ring 32 can also be arranged in a manner of directly abutting against the stationary shoulder 1.

[0041] As Figures 1 - 5 shown, specifically, a circumferential outer edge 13 is further provided on the outer wall around the upper end of the stationary shoulder 1, so that the stationary shoulder 1 can be easily connected to other components.

[0042] The present utility model is not limited to the above embodiments. If various modifications or deformations of the present utility model do not depart from the spirit and scope of the present utility model, and if these modifications and deformations fall within the scope of the claims of the present utility model and equivalent technical scope, then the present utility model also intends to include these modifications and deformations.

Claims

1. A stationary shoulder mechanism of a friction stir welding machine, characterized in that: It includes a stationary shoulder, a stirring head and a sliding bearing; a perforation penetrating the upper and lower ends of the stationary shoulder is provided in the middle of the stationary shoulder; the stirring head includes a head and a stirring main body connected in sequence from bottom to top; the lower end of the stirring main body is inserted into the perforation and there is a gap between the outer wall of the stirring main body and the side wall of the perforation; the head protrudes downward from the bottom surface of the stationary shoulder; the sliding bearing includes a bearing main body in a straight cylindrical shape and a positioning ring connected to the outer walls around the top of the bearing main body; the bearing main body is installed in the perforation and is sleeved on the stirring main body in a matching manner; the outer wall of the bearing main body is attached to the side wall of the perforation and the inner wall of the bearing main body is attached to the outer wall of the stirring main body; the positioning ring is connected to the top surface of the stationary shoulder; the sliding bearing can be used to limit the stirring head.

2. The stationary shoulder mechanism of the friction stir welding machine according to claim 1, characterized in that: The perforation includes a first cylindrical section, a conical section and a second cylindrical section with widths decreasing in sequence from top to bottom; the lower end of the stirring main body is placed in the second cylindrical section.

3. The stationary shoulder mechanism of the friction stir welding machine according to claim 2, characterized in that: The gap between the first cylindrical section and the stirring main body is larger than the gap between the second cylindrical section and the stirring main body; the gap between the conical section and the stirring main body is larger than the gap between the second cylindrical section and the stirring main body.

4. The stationary shoulder mechanism of the friction stir welding machine according to claim 2, characterized in that: The length of the bearing main body is less than the length of the first cylindrical section.

5. The stationary shoulder mechanism of the friction stir welding machine according to claim 1, characterized in that: A main chip removal hole penetrating the outer wall and inner wall of the stationary shoulder and capable of discharging waste chips is further provided on the stationary shoulder; the main chip removal hole is opened near the lower end of the perforation.

6. The stationary shoulder mechanism of the friction stir welding machine according to claim 5, characterized in that: A secondary chip removal hole penetrating the outer wall and inner wall of the stationary shoulder and capable of discharging waste chips is further provided on the stationary shoulder; the secondary chip removal hole is higher than the main chip removal hole.

7. The stationary shoulder mechanism of the friction stir welding machine according to claim 6, characterized in that: There are two secondary chip removal holes and the two secondary chip removal holes are respectively located on both sides of the stationary shoulder.

8. The stationary shoulder mechanism of the friction stir welding machine according to claim 1, characterized in that: The sliding bearing is a powder metallurgy sliding bearing.

9. The stationary shoulder mechanism of the friction stir welding machine according to claim 1, characterized in that: Both the top surface and the bottom surface of the stationary shoulder are flat surfaces.

10. The stationary shoulder mechanism of the friction stir welding machine according to claim 1, characterized in that: The positioning ring and the top surface of the stationary shoulder are locked by bolts.

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