CN110695511A

CN110695511A - Stirring needle spiral groove gradually-deepened stirring head

Info

Publication number: CN110695511A
Application number: CN201911052317.9A
Authority: CN
Inventors: 李贤清; 李志明; 周长兴; 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: 2020-01-17

Abstract

The invention discloses a stirring needle spiral groove gradually-deepened stirring head which comprises a clamping part, a shaft shoulder part and a stirring needle which are sequentially connected, wherein spiral grooves are formed in the periphery of the stirring needle, and the groove depth between every two adjacent spiral grooves is increased from the root part of the needle to the tip part of the needle. 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 spiral groove gradually-deepened stirring head

Technical Field

The invention mainly relates to a friction stir welding technology, in particular to a stirring pin spiral groove gradually-deepened 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 and the stirring force, and are beneficial to transferring and plasticizing welding materials. The spiral grooves of the stirring pin of the common stirring head are single equidistant thread lines, and the depths of the spiral grooves are the same. When the workpiece is faced with poor heat dissipation conditions or has a penetration requirement, the needle tip part of the stirring needle generates insufficient heat, and a poor welding seam is formed.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide the stirring pin spiral groove gradually-deepened stirring head which is simple and reliable in structure and can improve the welding speed and the welding quality.

In order to solve the technical problems, the invention adopts the following technical scheme:

the utility model provides a stirring needle helicla flute gradually dark 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 groove depth between the helicla flute is increased to the pinpoint portion by the needle root.

As a further improvement of the above technical solution:

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

t1≤4t0。

The depth of the groove between the other adjacent spiral grooves of the needle root part and the needle tip part is defined as tn, and t0 is more than or equal to tn and is less than t 1.

The depth of the grooves between the other adjacent spiral grooves is gradually increased 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 invention has the advantages that:

the stirring needle spiral groove gradually-deepened stirring head comprises a clamping part, a shaft shoulder part and a stirring needle which are sequentially connected, spiral grooves are formed in the periphery of the stirring needle, and the groove depth between every two adjacent spiral grooves is increased from the root part of the stirring needle to the tip part of the stirring needle. 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 increases the groove depth between the adjacent spiral grooves from the root part of the needle to the tip part, and compared with a single-head equal-depth thread stirring head, the stirring head increases the surface area of the tip part of the stirring needle, is beneficial to the tip part to generate more heat energy in the welding process, has higher speed of plasticizing welding materials, is beneficial to the root penetration and is also beneficial to improving the welding speed; the spiral groove at the tip of the stirring pin is deeper than that of a common stirring pin, so that 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 front view 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 below with reference to the drawings and specific examples.

Fig. 1 to 3 show an embodiment of a stirring pin spiral groove gradually-deepened stirring head of the invention, which comprises a clamping part 1, a shaft shoulder part 2 and a stirring pin 3 which are connected in sequence, wherein a spiral groove 31 is formed on the periphery of the stirring pin 3, and the groove depth between adjacent spiral grooves 31 is increased from a pin root part 32 to a pin tip part 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 increases the groove depth between the adjacent spiral grooves 31 in the direction from the needle root 32 to the needle tip 33, and compared with a single-head equal-depth thread stirring head, the stirring head increases the surface area of the needle tip 33 of the stirring needle 3, is beneficial to the needle tip 33 to generate more heat energy in the welding process, has higher speed of plasticizing welding materials, is beneficial to root penetration and is also beneficial to improving the welding speed; the spiral groove 31 of the pin part 33 of the stirring pin 3 is deeper than the general stirring pin 3, so that the stirring force is increased, the crystal grains are refined, the welding quality is favorably improved, the structure is simple and reliable, and the spiral groove is suitable for welding thick plates and materials with poor heat dissipation, particularly workpieces with penetration requirements and dissimilar materials.

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

In this embodiment, t1 is not less than 4t 0. t1 is 1.5t0, and the structure is simple and practical.

In this embodiment, the groove depth between the remaining adjacent spiral grooves 31 of the needle root portion 32 and the needle tip portion 33 is defined as tn, and t0 is not less than tn < t 1. In this configuration, the other groove depth in the middle may be greater than or equal to the groove depth closest to the needle root 32, which is simple in construction and easy to form.

In this embodiment, the groove depth between the remaining adjacent spiral grooves 31 increases stepwise from the needle root 32 to the needle tip 33. Namely, the groove depth is gradually increased from the needle root part 32 to the needle tip part 33 to form a structure with a deep upper part and a shallow lower part, 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 be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.

Claims

1. The utility model provides a stirring needle helicla flute gradually dark 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 depth of the grooves between every two adjacent spiral grooves (31) is increased from a pin root (32) to a pin tip (33).

2. The helical groove progressively deeper pin tumbler of claim 1, wherein: the groove depth between adjacent spiral grooves (31) nearest to the needle root (32) is defined as t0, the groove depth between adjacent spiral grooves (31) nearest to the needle tip (33) is defined as t1, and t1 > t 0.

3. The progressively deeper pin tumbler of claim 2, wherein: t1 is less than or equal to 4t 0.

4. The progressively deeper pin tumbler of claim 3, wherein: the groove depth between the needle root (32) and the other adjacent spiral grooves (31) of the needle tip (33) is defined as tn, and t0 is more than or equal to tn and is less than t 1.

5. The progressively deeper pin tumbler of claim 4 having helical grooves, wherein: the depth of the grooves between the other adjacent spiral grooves (31) is gradually increased from the needle root part (32) to the needle tip part (33).

6. The pin spiral groove progressively deeper bit according to any one of claims 1 to 5, 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.