CN211219146U

CN211219146U - Stirring needle helical groove gradually-dense stirring head

Info

Publication number: CN211219146U
Application number: CN201921868213.0U
Authority: CN
Inventors: 李志明; 周长兴; 李贤清; 钟南; 汤雨竹
Original assignee: Hunan Joinfront Welding Technology Co ltd
Current assignee: Hunan Joinfront Welding Technology Co ltd
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2020-08-11
Anticipated expiration: 2029-10-31

Abstract

The utility model discloses a stirring needle helicla flute gradually-dense type stirring head, including clamping part, shaft shoulder and the stirring needle that connects gradually, the helicla flute has been seted up to the week side of stirring needle, and the groove distance between the adjacent helicla flute is reduced to the pinpoint portion by the needle root. The stirring head has the advantages of simple and reliable structure and capability of improving the welding speed and the welding quality.

Description

Stirring needle helical groove gradually-dense stirring head

Technical Field

The utility model relates to a friction stir welding technique especially relates to a stirring pin helicla flute gradually-closing type stirring head.

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.

The spiral grooves on the stirring pin are mainly used for crushing oxides, increasing the surface area, increasing the stirring force, improving the heat production of the stirring pin and being beneficial to transferring and plasticizing welding materials. The spiral groove of the stirring pin of the stirring head is a single-head equidistant thread line. When the structure with better heat dissipation conditions at the periphery of the welding line, particularly the bottom of the welding line, adopts friction stir welding, insufficient heat generation at the bottom of the welding line is easy to occur, and poor welding lines are caused.

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 improve the stirring pin helicla flute gradually-dense type stirring head of welding speed and welding quality.

In order to solve the technical problem, the utility model discloses a following technical scheme:

the utility model provides a stirring needle helicla flute gradually denseness type stirring head, includes clamping part, shaft shoulder and the stirring needle that connects gradually, the helicla flute has been seted up to the week side of stirring needle, and is adjacent slot pitch between the helicla flute is reduced to the pinpoint portion by the needle root.

As a further improvement of the above technical solution:

the pitch between adjacent helical grooves closest to the root of the needle is defined as t0, and the pitch between adjacent helical grooves closest to the tip of the needle is defined as t1, t1 < t 0.

The groove distance between the other adjacent spiral grooves of the needle root part and the needle tip part is defined as tn, and t1 is more than or equal to tn and is less than t 0.

The groove distance between the other adjacent spiral grooves is gradually reduced from the root part of the needle to the tip part of the needle.

The diameter of the needle tip is defined as L1, the diameter of the needle root is defined as L2, and L1 < L2.

Compared with the prior art, the utility model has the advantages of:

the utility model discloses a stirring needle helicla flute gradually-dense type stirring head, including clamping part, shaft shoulder and the stirring needle that connects gradually, the helicla flute has been seted up to the week side of stirring needle, and the groove distance between the adjacent helicla flute is reduced to the pinpoint portion by the needle root. 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 has the advantages that the groove distance between the adjacent spiral grooves is reduced from the root part of the needle to the tip part of the needle, compared with a single-head equidistant thread stirring head, the axial sectional area near the tip part of the stirring needle is increased, the surface area near the tip part of the stirring needle is increased, more heat energy is generated near the tip part of the needle in the welding process, the speed of plasticizing welding materials is higher, and the welding speed is improved; the thread grooves on the unit height near the needle tip part of the stirring needle are more than those of the common stirring needle, so that a gradually-compact structure is formed, the stirring force is increased, the crystal grains are refined, the welding quality is favorably improved, and the structure is simple and reliable.

Drawings

Fig. 1 is a schematic perspective view of the present invention.

Fig. 2 is a schematic view of the structure of the present invention.

Fig. 3 is an enlarged schematic view of a portion a of fig. 2.

The reference numerals in the figures denote:

1. a clamping portion; 2. a shaft shoulder; 3. a stirring pin; 31. a helical groove; 32. a needle root; 33. a needle tip.

Detailed Description

The invention will be described in further detail with reference to the drawings and specific examples.

Fig. 1 to 3 show an embodiment of the gradually-dense stirring head of the stirring pin helical groove of the present invention, including the clamping portion 1, the shaft shoulder portion 2 and the stirring pin 3 which are connected in sequence, the helical groove 31 is provided on the circumferential side of the stirring pin 3, and the groove distance between the adjacent helical grooves 31 is reduced from the pin root portion 32 to the pin tip portion 33. 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 has the advantages that the groove pitch between the adjacent spiral grooves 31 is reduced from the needle root 32 to the needle tip 33, compared with a single-head equidistant thread stirring head, the axial sectional area of the stirring head 3 near the needle tip 33 is increased, the surface area of the stirring head 3 near the needle tip 33 is increased, more heat energy is generated near the needle tip 33 in the welding process, the speed of plasticizing welding materials is higher, and the welding speed is improved; the spiral grooves 31 on the unit height near the needle tip part 33 of the stirring needle 3 are more than those of the ordinary stirring needle 3, and a gradually-dense structure is formed, so that the stirring force is increased, the crystal grains are refined, and the welding quality is favorably improved; the structure is simple and reliable, and the welding machine is suitable for welding thick plates, welding seam peripheries, particularly materials and dissimilar materials with good heat dissipation conditions at the bottom.

In the present embodiment, the pitch between the adjacent spiral grooves 31 closest to the needle root 32 is defined as t0, and the pitch between the adjacent spiral grooves 31 closest to the needle tip 33 is defined as t1, t1 < t 0. In the structure, the groove distance of the nearest needle root part 32 is larger than that of the nearest needle tip part 33, so that the number of the upper spiral grooves is larger than that of the lower spiral grooves, the stirring force is increased, the crystal grains are refined, and the welding quality is favorably improved.

In this embodiment, the pitch between the remaining adjacent spiral grooves 31 of the needle root portion 32 and the needle tip portion 33 is defined as tn, and t1 is not less than tn < t 0. In this structure, the other groove pitch in the middle may be greater than or equal to the groove pitch closest to the needle tip portion 33, which is simple in structure and easy to mold.

In this embodiment, the pitch between the remaining adjacent spiral grooves 31 decreases stepwise from the needle root 32 to the needle tip 33. Namely, the groove pitch is gradually reduced from the needle root part 32 to the needle tip part 33 to form a structure with a lower sparse and upper dense type, and the structure is simple and the design is ingenious.

In this embodiment, the diameter of the needle tip 33 is defined as L1, the diameter of the needle root 32 is defined as L2, and L1 < L2. The whole stirring needle 3 is in a conical structure due to the arrangement, and the forging pressure is improved.

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

1. The utility model provides a stirring needle helicla flute gradually denseness type stirring head, includes clamping part (1), shaft shoulder (2) and stirring needle (3) that connect gradually, its characterized in that: spiral grooves (31) are formed in the peripheral side of the stirring pin (3), and the groove distance between every two adjacent spiral grooves (31) is reduced from a pin root (32) to a pin tip (33).

2. The pin helix groove tapered pin tumbler according to claim 1, wherein: the pitch between adjacent helical grooves (31) closest to the needle root (32) is defined as t0, the pitch between adjacent helical grooves (31) closest to the needle tip (33) is defined as t1, and t1 < t 0.

3. The pin helix groove tapered pin tumbler according to claim 2, wherein: the groove distance between the needle root (32) and the other adjacent spiral grooves (31) of the needle tip (33) is defined as tn, and t1 is more than or equal to tn and is less than t 0.

4. The pin helix groove tapered pin tumbler according to claim 3, wherein: the groove distance between the other adjacent spiral grooves (31) is gradually reduced from the needle root part (32) to the needle tip part (33).

5. The pin spiral groove tapered pin tumbler according to any one of claims 1 to 4, wherein: the diameter of the needle tip (33) is defined as L1, the diameter of the needle root (32) is defined as L2, and L1 is less than L2.