CN211219145U - Bottom convex stirring head for friction stir welding - Google Patents
Bottom convex stirring head for friction stir welding Download PDFInfo
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- CN211219145U CN211219145U CN201921868212.6U CN201921868212U CN211219145U CN 211219145 U CN211219145 U CN 211219145U CN 201921868212 U CN201921868212 U CN 201921868212U CN 211219145 U CN211219145 U CN 211219145U
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- stir welding
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Abstract
The utility model discloses a protruding type stirring head in end for friction stir welding, including clamping part, shaft shoulder and the stirring pin that connects gradually, the stirring pin is equipped with the boss that is used for increasing bottom softening metal flow and reduces bottom softening metal migration resistance in the bottom of its needle point. The stirring head has the advantages of simple and reliable structure, capability of reducing the migration resistance of softened metal at the bottom, capability of preventing grooves and forming good welding seams.
Description
Technical Field
The utility model relates to a friction stir welding technique especially relates to a protruding type stirring head in end for friction stir welding.
Background
In the process of friction stir welding, the mutual action between the stirring head and the workpiece material generates heat, the workpiece material around the stirring head is heated to a plasticized state to form a welding line, and the heat mainly comprises the friction heat generated between the shaft shoulder, the stirring needle and the base material and the plastic deformation heat generated by stirring and extruding the workpiece material. In the process of friction stir welding, the temperature field of the workpiece is not uniformly distributed, and the rule that the temperature at the shaft shoulder of the stirring head is highest and is sequentially decreased towards the end face of the stirring pin is presented.
The stirring head is the core of the stirring friction welding technology. It interacts with the welded workpiece to realize the connection of the welded material.
The size design of the stirring head has no mature theory, the stirring head is designed mostly according to experience, the stirring head mainly comprises a stirring pin, a shaft shoulder, a clamping area and the like, and the stirring pin is positioned at the top of the stirring head and has different shapes. The stirring pin generates partial heat energy through rotary friction, the main function of the stirring pin is similar to the function of a pump, the stirring pin can enable metal in a high plasticizing state to flow from front to back along the stirring pin while keeping up-and-down movement, and the metal is forged and cooled through a shaft shoulder of the stirring head to form a joint. The size of the stirring pin determines the size and the welding speed of the welding seam welding nuclear area structure; the shape of the stirring pin determines the heating mode and the mode of upsetting the plastic material in the welding process, and directly influences the flowing form of the softened material in the welding seam area, thereby playing an important role in forming the joint. The pin shape and size and related welding process parameters together determine the heat generation and material flow during welding, and ultimately the quality of the friction stir weld joint.
Generally, the stirring pin is of cylindrical or conical design. Because the materials of the workpieces are different, the structures are different, the thicknesses of the materials of the workpieces are different, the stirring pin adopts a common structural design, and the plasticized metal cannot be fully stirred and moved under a plurality of working conditions, so that the defects of holes inside the welding line can be caused, and even serious surface grooves can be generated.
The common stirring head is in the welding process, because the bottom of the needle point is small, and the end face is a plane, the generated stirring force is small, the flowing filling of bottom materials is not facilitated, a groove line is easily generated at the bottom, the formation of a good welding line is not facilitated, and the welding quality is influenced to a certain extent.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to overcome prior art not enough, provide a simple structure reliable, can reduce bottom softened metal migration resistance, can prevent the slot and form the protruding type stirring head in end that is used for friction stir welding of good welding seam.
In order to solve the technical problem, the utility model discloses a following technical scheme:
the utility model provides a protruding type stirring head in end for friction stir welding, includes clamping part, shaft shoulder and the stirring pin that connects gradually, the stirring pin is equipped with the boss that is used for increasing bottom softened metal flow and reduces bottom softened metal migration resistance in the bottom of its needle point.
As a further improvement of the above technical solution:
the axis of the stirring pin is defined as a rotating central line, the bottom outline of the lug boss is defined as a rotating bus, and the lug boss is formed by rotating the rotating bus around the rotating central line for a circle.
The perpendicular line of the contact point of the lug boss and the weldment is defined as a welding line, and an included angle a is formed between the welding line and the rotation center line during welding, wherein a is more than or equal to 1 degree and less than or equal to 5 degrees.
The diameter of the needle tip bottom is defined as L1, the diameter of the boss is defined as L2, L2 is more than or equal to L1/10 and less than or equal to L1.
The height of the boss is defined as h, and the height of the boss is more than or equal to L1/70 and less than or equal to L1/7.
The bottom outline of the boss is a smoothly-transitional convex arc line.
The bottom outline of the boss is formed by connecting oblique lines on the peripheral side and a circular arc line protruding outwards from the middle.
The bottom outer contour line of the boss is formed by connecting an arc line protruding outwards on the peripheral side and a horizontal straight line in the middle.
The bottom outer contour line of the boss is formed by connecting a vertical straight line on the peripheral side and a middle convex arc line.
The outer contour line of the bottom of the boss is formed by connecting an arc line which is concave at the peripheral side and an arc line which is convex at the middle.
The diameter of the arc line which protrudes outwards from the middle is defined as L3, the diameter of the bottom of the needle tip is defined as L1, L1/10 is more than or equal to L3 is more than or equal to L1/2.
Compared with the prior art, the utility model has the advantages of:
the utility model discloses a protruding type stirring head in end for friction stir welding, including clamping part, shaft shoulder and the stirring pin that connects gradually, the stirring pin is equipped with in the bottom of its needle point and is used for increasing the boss that the bottom softened metal flows and reduces bottom softened metal migration resistance. During welding, the clamping part is used for clamping, the stirring pin generates heat energy through rotary friction, and the shaft shoulder part is used for forming forging and pressing. Compared with the traditional structure, the stirring head is provided with the boss at the bottom of the needle point in a molding manner, in the welding process, the boss increases the flow of bottom softened metal, reduces the migration resistance of the bottom softened metal, optimizes the stability and the insertion resistance of the stirring head when the stirring head is contacted with a to-be-welded part to be inserted, is favorable for the flow filling of a bottom material, is not easy to generate a groove at the bottom, is favorable for forming a good welding line, and has a simple and reliable structure.
Drawings
Fig. 1 is a schematic perspective view of embodiment 1 of the present invention.
Fig. 2 is a schematic front view of embodiment 1 of the present invention.
Fig. 3 is a schematic diagram of a partially enlarged structure of embodiment 1 of the present invention.
Fig. 4 is a partially enlarged schematic structural view (in use) of embodiment 1 of the present invention.
Fig. 5 is a schematic structural view of a boss in embodiment 1 of the present invention.
Fig. 6 is a schematic structural view of a boss in embodiment 2 of the present invention.
Fig. 7 is a schematic structural view of a boss in embodiment 3 of the present invention.
Fig. 8 is a schematic structural view of a boss in embodiment 4 of the present invention.
Fig. 9 is a schematic structural view of a boss in embodiment 5 of the present invention.
The reference numerals in the figures denote:
1. a clamping portion; 2. a shaft shoulder; 3. a stirring pin; 31. a needle tip; 32. a boss; 321. rotating the bus; 322. welding wires; 33. a center line of rotation.
Detailed Description
The invention will be described in further detail with reference to the drawings and specific examples.
Example 1:
fig. 1 to 5 show a first embodiment of a bottom convex stirring head for friction stir welding according to the present invention, which comprises a clamping portion 1, a shaft shoulder portion 2 and a stirring pin 3 connected in sequence, wherein the stirring pin 3 is provided with a boss 32 at the bottom of a needle point 31 thereof for increasing the flow of bottom softened metal and reducing the migration resistance of the bottom softened metal. During welding, the clamping part 1 is used for clamping, the stirring pin 3 generates heat energy through rotary friction, and the shaft shoulder part 2 is used for forging. Compared with the traditional structure, the stirring head is provided with the boss 32 at the bottom of the needle point 31 in a molding mode, in the welding process, the boss 32 increases the flow of bottom softened metal, the migration resistance of the bottom softened metal is reduced, the stability and the insertion resistance of the stirring head when a welding piece is inserted into the stirring head in contact are optimized, so that the filling of a bottom material is facilitated, a groove is not easy to generate at the bottom, a good welding line is facilitated to be formed, and the stirring head is simple and reliable in structure.
In this embodiment, the axis of the stirring pin 3 is defined as a rotation center line 33, the bottom outline of the boss 32 is defined as a rotation generatrix 321, and the boss 32 is formed by the rotation generatrix 321 rotating around the rotation center line 33. The boss 32 is rotated by the rotation generatrix 321 around the rotation central line 33 for a circle to form an integrated structure with the needle point 31, and the integral strength is improved.
In this embodiment, the perpendicular line of the contact point between the boss 32 and the weldment is defined as a welding line 322, and during welding, the welding line 322 forms an included angle a with the rotation center line 33, where a is greater than or equal to 1 degree and less than or equal to 5 degrees. During welding, the stirring pin 3 is at a certain inclination angle, that is, the welding line 322 forms an included angle a with the rotation center line 33, so that the arrangement is more favorable for the flowing filling of the bottom material when moving along the welding direction, thereby forming a good welding seam, in this embodiment, a is set to be 4 °.
In the embodiment, the diameter of the bottom of the needle tip 31 is defined as L1, the diameter of the boss 32 is defined as L2, and L2 is more than or equal to L1/10 and less than or equal to L1. In the structure, the diameter L2 of the boss 32 is smaller than the diameter L1 of the bottom of the needle point 31, namely, a space is formed on the periphery of the boss 32, the migration resistance of a bottom welding plasticizing material is reduced, and the L2 is more than or equal to L1/10, so that the strength of the boss 32 can be ensured, and the service life is prolonged. In this embodiment, L2 is L1/3.
In the embodiment, the height of the boss 32 is defined as h, and h is more than or equal to L1/70 and less than or equal to L1/7. The design of the height h of the boss 32 is mainly to ensure the reasonable space of the periphery of the boss 32, and the height h is too high, which can increase the fluidity of the welding plasticized material and is not beneficial to the flow filling of the bottom material; the height h is too low, the migration resistance of the welding plasticized material is increased, the flow filling and the migration resistance reduction of the bottom material can be considered through the arrangement that h is more than or equal to L1/70 and less than or equal to L1/7, and the structure is simple and ingenious in design. In this example, h is L1/20.
In this embodiment, the bottom contour of the boss 32 is a smoothly transitional convex arc line. The structure is simple and the forming is easy.
Example 2:
as shown in fig. 6, the second embodiment of the bottom convex type stirring head for friction stir welding of the present invention is substantially the same as embodiment 1, and the difference is only that: in this embodiment, the outer bottom contour of the boss 32 is formed by connecting a peripheral oblique line and a middle convex arc line. The structure is simple and the forming is easy.
Example 3:
as shown in fig. 7, the third embodiment of the bottom convex type stirring head for friction stir welding of the present invention is substantially the same as embodiment 1, except that: in this embodiment, the outer bottom contour of the boss 32 is formed by connecting a circular arc line protruding outward on the peripheral side and a horizontal straight line in the middle. The structure is simple and the forming is easy.
Example 4:
as shown in fig. 8, the fourth embodiment of the bottom convex type stirring head for friction stir welding of the present invention is substantially the same as embodiment 1, except that: in this embodiment, the bottom contour of the boss 32 is formed by connecting a vertical straight line on the peripheral side and a middle convex arc line. The structure is simple and the forming is easy.
Example 5:
as shown in fig. 9, the fifth embodiment of the bottom convex type stirring head for friction stir welding of the present invention is substantially the same as embodiment 1, and the difference is only that: in this embodiment, the outer bottom contour of the boss 32 is formed by connecting an arc line with an inward concave periphery and an outward convex middle arc line. The structure is simple and the forming is easy.
In the embodiment, the diameter of the arc line which protrudes outwards from the middle is defined as L3, the diameter of the bottom of the needle tip 31 is defined as L1, and L3 is more than or equal to L1/10 and less than or equal to L1/2. In the structure, the diameter L2 of the boss 32 is smaller than the diameter L1 of the bottom of the needle point 31, namely, a space is formed at the periphery of the boss 32, the migration resistance of welding plasticized materials is reduced, and the L2 is more than or equal to L1/10, so that the strength of the boss 32 can be ensured, and the service life is prolonged. In this embodiment, L2 is L1/3.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention. The technical solution of the present invention can be used by anyone skilled in the art to make many possible variations and modifications, or to modify equivalent embodiments, without departing from the scope of the technical solution of the present invention, using the technical content disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments by the technical entity of the present invention should fall within the protection scope of the technical solution of the present invention.
Claims (11)
1. The utility model provides a protruding type stirring head in end for friction stir welding, includes clamping part (1), shaft shoulder (2) and stirring pin (3) that connect gradually, its characterized in that: the stirring needle (3) is provided with a lug boss (32) used for increasing the flow of bottom softened metal and reducing the migration resistance of the bottom softened metal at the bottom of a needle point (31).
2. A bottom male tool for friction stir welding according to claim 1 wherein: the axis of the stirring pin (3) is defined as a rotation center line (33), the bottom outline of the boss (32) is defined as a rotation generatrix (321), and the boss (32) is formed by the rotation generatrix (321) rotating around the rotation center line (33).
3. A bottom male tool for friction stir welding according to claim 2 wherein: the perpendicular line of the contact point of the lug boss (32) and the weldment is defined as a welding line (322), and an included angle a is formed between the welding line (322) and the rotation center line (33) during welding, wherein a is more than or equal to 1 degree and less than or equal to 5 degrees.
4. A bottom male tool for friction stir welding according to claim 3 wherein: the diameter of the bottom of the needle tip (31) is defined as L1, the diameter of the boss (32) is defined as L2, and L2 is more than or equal to L1/10 and less than or equal to L1.
5. A bottom male tool for friction stir welding according to claim 4 wherein: the height of the boss (32) is defined as h, and the L1/70 is more than or equal to h and less than or equal to L1/7.
6. A bottom male tool for friction stir welding according to any one of claims 1 to 5 wherein: the bottom outline of the boss (32) is a smooth transition convex arc line.
7. A bottom male tool for friction stir welding according to any one of claims 1 to 5 wherein: the bottom outer contour line of the boss (32) is formed by connecting a peripheral oblique line and a middle convex arc line.
8. A bottom male tool for friction stir welding according to any one of claims 1 to 5 wherein: the bottom outer contour line of the boss (32) is formed by connecting a circular arc line which is convex at the peripheral side and a horizontal straight line in the middle.
9. A bottom male tool for friction stir welding according to any one of claims 1 to 5 wherein: the bottom outer contour line of the boss (32) is formed by connecting a vertical straight line on the peripheral side and a middle convex arc line.
10. A bottom male tool for friction stir welding according to any one of claims 1 to 5 wherein: the outer contour line of the bottom of the boss (32) is formed by connecting an arc line which is concave at the peripheral side and an arc line which is convex at the middle.
11. A bottom male tool for friction stir welding according to claim 10 wherein: the diameter of the arc line which protrudes outwards from the middle is defined as L3, the diameter of the bottom of the needle point (31) is defined as L1, and L3 is more than or equal to L1/10 and less than or equal to L1/2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921868212.6U CN211219145U (en) | 2019-10-31 | 2019-10-31 | Bottom convex stirring head for friction stir welding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921868212.6U CN211219145U (en) | 2019-10-31 | 2019-10-31 | Bottom convex stirring head for friction stir welding |
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| Publication Number | Publication Date |
|---|---|
| CN211219145U true CN211219145U (en) | 2020-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921868212.6U Active CN211219145U (en) | 2019-10-31 | 2019-10-31 | Bottom convex stirring head for friction stir welding |
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|---|---|
| CN (1) | CN211219145U (en) |
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- 2019-10-31 CN CN201921868212.6U patent/CN211219145U/en active Active
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