CN104722910A - Stirring friction connecting device capable of reducing deformation and removing flashes - Google Patents

Abstract

The invention relates to a stirring friction connecting device capable of reducing workpiece deformation and removing flashes. The stirring friction connecting device is composed of a stirring shaft (1), a pressure block (2), roller retainers (3), rollers (4) and a sleeve (5). The sleeve (5) achieves moving and restraining effects on a workpiece through downward pressing force transmitted by the pressure block (2), so that it is guaranteed that the workpiece can be restrained at the optimal state at every moment in the welding process, and workpiece deformation is effectively reduced; in addition, in the downward pressing process of the sleeve (5), the flashes generated in the welding process can be effectively removed, and the subsequent milling process is simplified.

Description

A friction stir joining device capable of reducing deformation and removing flash

technical field

The invention relates to a friction stir joining device capable of reducing deformation and removing burrs, especially for butt welding of thin plates (<=2mm), which can effectively prevent plate deformation and remove burrs during welding, which belongs to material connection technology field.

Background technique

Friction stir welding (FSW) was invented by The Welding Institute (TWI) in 1991. It is a new solid-phase joining technology with a patent number (US 5460317). When welding with this technology, stirring The head rotates at a constant speed and moves at a constant speed according to the set trajectory. The stirring needle is inserted into the material for stirring, and the strong friction between the shoulder of the stirring head and the base material makes the metal material in the heat-affected zone in a solid solution state. , the maximum temperature of the base metal does not exceed the melting point, under the joint action of the stirring head and the stirring needle, the metals in the weld area are connected together, and finally the entire welding process is completed.

The most important part in the friction stir joining process is the stirring head. The shape of the stirring head is directly related to the weld forming effect. Many patents at home and abroad have designed and improved the appearance of the stirring head.

During the welding process, due to the high-speed rotation of the stirring head, and with the increase of the welding speed, flashing will inevitably occur. Many domestic patents have also done a lot of work on the method of removing flashing, such as changing the stirring head shape, adding additional devices, etc.

In the process of friction stir welding of thin plates (thickness less than 2mm), because the plate is too thin, it is not easy to fix, especially at the joint of two plates, due to the interference between the position of the clamp and the stirring head, the distance between the clamp and the weld is relatively far, so in During the welding process, it is easy to have poor butt joint or warping phenomenon, which seriously affects the welding quality.

The present invention improves the friction stir connection device on the basis of thin plate friction stir connection, and aims to reduce workpiece deformation, remove burrs, improve welding quality and reduce follow-up milling workload.

Contents of the invention

Purpose of the present invention :

The object of the present invention is to provide a friction stir joining device which can fix workpieces, reduce deformation of workpieces, remove burrs and improve welding quality.

The technical solution of the present invention : a friction stir connection device for reducing deformation and removing flash, characterized in that the friction stir connection device consists of a stirring shaft (1), a large cylinder (8), a pressure block (2), a roller It consists of a cage (3), a roller (4), and a sleeve (5). The stirring shaft (1) consists of six parts: clamping handle (6), large cylinder (8), supporting cylinder (9), end cylinder (10), stirring head shoulder (11), and stirring needle (12) Composition, as shown in Figure 2. The clamping handle (6) is milled with a clamping plane (7); the bearing block (2) and the sleeve (5) keep relative rotation through the roller (4).

In the above-mentioned friction stir connection device for reducing deformation and removing flash, the pressure bearing block (2) and the sleeve (5) are interference fit, and when the main shaft drives the stirring head to rotate, the pressure bearing block (2) Rotate synchronously, because the pressure bearing block (2) is under the large cylinder (8), it can transmit the downward force, and transmit the downward force to the sleeve (5).

In the friction stir connection device for reducing deformation and removing flash, the pressure-bearing block (2) and the sleeve (5) are connected through the roller cage (3) and the roller (4), and the sleeve ( 5) There is an appropriate amount of clearance between the main body of the mixing head to ensure that the sleeve (5) does not touch the main body of the mixing head, so that the sleeve (5) does not rotate with the mixing head during work.

In the friction stir connection device for reducing deformation and removing flash, the sleeve (5) is in the shape of a cylinder, and an observation window is opened on each side, which is convenient for adjusting the downward pressure of the stirring head shaft shoulder, and can directly observe In the welding process, especially in the process of adjusting parameters, it can be judged whether to stop the welding process according to the welding result.

In the friction stir connection device for reducing deformation and removing flash, the vertical distance between the sleeve (5) and the shoulder of the stirring head is the amount of pressure during the welding process, so that it can be ensured that during the welding process, the sleeve (5) It is always in contact with the workpiece, and the downward force transmitted through the pressure block (2) acts as a movement constraint on the workpiece, ensuring that the constraint of the workpiece is optimal at each moment of welding.

The described friction stir joining device for reducing deformation and removing burrs easily generates burrs around the weld seam during the welding process, and the bottom end of the sleeve (5) in contact with the workpiece can, during the moving process of the workpiece, The softened metal is removed through the contact between the sleeve and the workpiece, which reduces the work of subsequent milling and correspondingly reduces the secondary deformation of the workpiece.

In the friction stir connection device for reducing deformation and removing flash, the sleeve is installed outside the stirring head, and the sleeve can be disassembled for different plate thicknesses and replaced with sleeves of other sizes to ensure that different sizes are met. working conditions.

The present invention has the advantages and beneficial effects : the present invention proposes a friction stir connection device that reduces deformation and removes burrs. By improving the external device of the stirring head and adding a sleeve, the constraint problem of the workpiece is improved, and the dynamic joint is realized. Constraints; through the contact of the bottom end of the sleeve with the workpiece, the flash is effectively removed.

Description of drawings:

Fig. 1 is a schematic sectional view of the main structure of the present invention;

Fig. 2 is a schematic diagram of the stirring shaft of the present invention;

Fig. 3 is a schematic diagram of the main structure of the present invention;

Fig. 4 is a schematic diagram of the sleeve of the present invention.

Detailed ways:

As shown in Figure 1 and Figure 2, a friction stir connection device that reduces deformation and removes flashing consists of a stirring shaft (1), a large cylinder (8), a bearing block (2), and a roller cage (3) , a roller (4), and a sleeve (5). The stirring shaft (1) consists of six parts: clamping handle (6), large cylinder (8), supporting cylinder (9), end cylinder (10), stirring head shoulder (11), and stirring needle (12) composition. The clamping handle (6) is milled with a clamping plane (7); the bearing block (2) and the sleeve (5) keep relative rotation through the roller (4). One end of the end cylinder (10) is the stirring head shaft shoulder (11) integrated with it, and the other end is a support cylinder (9), which is connected with the large cylinder (8), and the large cylinder The body (8) and the clamping handle (6) are integrated, the stirring head clamping handle (6), the large cylinder (8), the supporting cylinder (9), the end cylinder (10) and the shoulder of the stirring head (11) is a coaxial structure. The clamping handle (6) is milled with a clamping plane (7); the pressure bearing block (2) is sleeved outside the support cylinder (9), and rotates together with the support cylinder (9). The pressure bearing block (2) and the sleeve The cylinders (5) are connected through the roller cage (3) and the roller (4).

In the friction stir connection device for reducing deformation and removing flash, the stirring head consists of a clamping handle (6), a large cylinder (8), a supporting cylinder (9), and an end cylinder from top to bottom. (10), stirring head shaft shoulder (11) and stirring needle (12). The clamping handle (6) is milled with a clamping plane (7), which is convenient for clamping on the main shaft. The pressure block (2) is under the large cylinder (8), and the roller cage (3) is of the same thickness. The disc has six holes evenly drilled on it. The roller (4) is embedded on the roller cage (3). The inner diameter of the roller cage (3) is an interference fit with the support cylinder (9), and the pressure There are grooves on the end faces of the block (2) and the sleeve (5), and the roller (4) is embedded in the groove to ensure that the sleeve (5) remains stationary when the pressure-bearing block (2) rotates with the mixing head .

The invention proposes a friction stir connection device that reduces deformation and removes flash. When the main shaft drives the stirring head to rotate, the pressure bearing block (2) rotates synchronously. Below, the downward force can be transmitted, and the downward force can be transmitted to the sleeve (5), so that the sleeve (5) can compress the workpiece during the movement of the workpiece.

In the above-mentioned friction stir connection device for reducing deformation and removing flash, the sleeve (5) is a hollow cylinder, as shown in Figure 4, and an observation window is opened on each side to facilitate the adjustment of the bottom of the shaft shoulder of the stirring head. Pressure, can observe the welding process and working status in real time, especially in the experimental stage of initial parameter adjustment, can judge whether to stop the welding process according to the welding results.

In the friction stir connection device for reducing deformation and removing flash, the vertical distance between the sleeve (5) and the shoulder of the stirring head is the amount of pressure during the welding process, so that it can be ensured that during the welding process, the sleeve (5) It is always in contact with the workpiece, and the downward force transmitted through the pressure block (2) acts as a movement constraint on the workpiece, ensuring that the constraint of the workpiece is optimal at each moment of welding.

The described friction stir joining device for reducing deformation and removing burrs easily generates burrs around the weld seam during the welding process, and the bottom end of the sleeve (5) in contact with the workpiece can, during the moving process of the workpiece, The softened metal is removed through the contact between the sleeve and the workpiece, which reduces the work of subsequent milling and correspondingly reduces the secondary deformation of the workpiece.

The above-mentioned friction stir connection device for reducing deformation and removing flashing needs to adjust the vertical distance between the sleeve and the shaft shoulder for different plate thicknesses and different pressing amounts. The sleeve involved in the present invention is easy to disassemble , can meet different working conditions.

The implementation process of welding work is as follows:

Example 1

The implementation process is described with reference to Fig. 1 and Fig. 2 . In this embodiment, the thickness of the workpiece to be welded is 2mm, the length of the stirring needle is 1.5mm, the amount of pressure during welding is 2mm, the vertical distance between the sleeve and the shaft shoulder is 0.5mm, the outer diameter of the sleeve is 65mm, and the inner diameter is 20mm, the thickness of the sleeve is 22.5mm. The height of the sleeve is 33.5mm. During the welding process, the stirring head, the large cylinder (8) and the bearing block (2) rotate around the axis, but the sleeve (5) does not rotate. After the welding starts, the workpiece moves at a constant speed in a certain direction , the sleeve (5) compresses the workpiece through the downward pressure transmitted by the pressure block (2), realizing the vertical constraint. After the welding starts, all the surrounding areas to be welded are fixed to ensure the smoothness of the welding process. In the last area, the flash generated by the friction stirring process between the stirring head and the workpiece can be removed by contacting the bottom in the area where the sleeve (5) passes.

Example 2

The implementation process is described with reference to Fig. 1 and Fig. 2 . In this embodiment, the thickness of the workpiece to be welded is 1mm, the length of the stirring pin is 0.8mm, the amount of pressure during welding is 1mm, the vertical distance between the sleeve and the shaft shoulder is 0.2mm, the outer diameter of the sleeve is 65mm, and the inner diameter is 20mm, the thickness of the sleeve is 22.5mm. The height of the sleeve is 33.2mm. During the welding process, the stirring shaft (1), the large cylinder (8), and the pressure block (2) rotate around the axis, but the sleeve (5) does not rotate. After the welding starts, the workpiece moves along a certain direction Moving at a constant speed, the sleeve (5) presses the workpiece through the downward pressure transmitted by the pressure block (2), realizing the vertical constraint. After the welding starts, all the surrounding areas to be welded are fixed to ensure the smoothness of the welding process. At the same time, in the area after welding, the softened metal can be removed by contacting the bottom of the sleeve due to the flash produced by the stirring head and the workpiece during the friction stirring process.

Claims (8)

1. A friction stir connection device for reducing deformation and removing flash, characterized in that the friction stir connection device consists of a stirring shaft (1), a pressure block (2), a roller cage (3), a roller (4 ), sleeve (5). 2. The stirring shaft (1) consists of a clamping handle (6), a large cylinder (8), a supporting cylinder (9), an end cylinder (10), a stirring head shoulder (11), and a stirring needle (12) It consists of six parts, the clamping handle (6) is milled with a clamping plane (7); the bearing block (2) and the sleeve (5) keep relative rotation through the roller (4). 3. A friction stir connection device for reducing deformation and removing flash according to claim 1, characterized in that: the pressure bearing block (2) and the supporting cylinder (9) are kept with the stirring shaft through interference fit Rotating synchronously, in the axial direction, the pressure bearing block (2) bears the downward force of the large cylinder (8), and transmits the downward force to the sleeve (5). 4. A friction stir connection device for reducing deformation and removing flash according to claim 1, characterized in that: between the pressure bearing block (2) and the sleeve (5) there is a roller cage (3), The roller (4) keeps rotating relative to each other, and there is an appropriate amount of clearance between the sleeve (5) and the main body of the stirring head to ensure that there is no contact between the sleeve (5) and the main body of the stirring head, so that during the working process, the sleeve (5) ) does not rotate with the stirring head. 5. A friction stir connection device for reducing deformation and removing flash according to claim 1, characterized in that: the sleeve (5) is in the shape of a cylinder, and an observation window is opened on each side, which is convenient for adjusting the shaft of the stirring head The pressing amount of the shoulder can directly observe the welding process, especially in the process of adjusting the parameters, and it can be judged whether the welding process needs to be stopped according to the welding result. 6. A friction stir connection device for reducing deformation and removing flash according to claim 1, characterized in that the distance between the sleeve (5) and the shaft shoulder of the stirring head in the vertical direction is the amount of pressure in the welding process, so that It can ensure that during the welding process, the sleeve (5) maintains a continuous contact state with the workpiece, and the downward force transmitted through the pressure bearing block (2) acts as a movement constraint on the workpiece, ensuring that the constraint of the workpiece at each moment of welding is optimal state. 7. A friction stir joining device for reducing deformation and removing burrs according to claim 1, characterized in that: during the welding process, burrs are easily generated around the weld seam, and the sleeve (5) is in contact with the workpiece At the bottom end, during the moving process of the workpiece, the softened metal can be removed through the contact between the sleeve and the workpiece, which correspondingly reduces the secondary deformation of the workpiece and simplifies the subsequent milling process. 8. A friction stir joining device for reducing deformation and removing flash according to claim 1, characterized in that: according to different welding conditions, the amount of pressing force will change, and by replacing the sleeve, different plate welding can be realized. Welding of thick materials.