TWI785898B - Friction stir welding device - Google Patents

Abstract

The invention discloses a friction stir welding device, comprising: a frame body; a rotating shaft module connected to the frame body, comprising: an inner rotating shaft; and an outer rotating shaft sleeved on the outside of the inner rotating shaft; and a welding tool, fixed to the inner rotating shaft; and a pressing block sleeved on the outside of the welding tool and fixed to the outer rotating shaft; when the welding tool performs friction stir welding on the two workpieces, the pressing block rotates relatively to and presses the two workpieces, the pressing force of the pressing block to hold the two workpieces is less than the force of the welding tool to press down the two workpieces.

Description

Friction stir welding device

The present invention relates to a friction stir welding device, in particular to a friction stir welding device capable of providing pressing and leveling of thin plate workpieces to be welded.

Friction stir welding is a solid-state welding method. The friction stir tool is used to rub against the workpiece to be welded at high speed to generate heat to soften the material to be welded and form a weld bead. The mechanical properties of the weld bead are better than those of traditional arc welding. The energy is low, and the welding process does not produce smoke and arc light, which is regarded as a green and environmentally friendly process.

When performing friction stir welding on a thin plate (such as a plate thickness less than 3mm), it is limited by the rigidity of the workpiece to be welded, and it is necessary to provide appropriate pressure for the workpiece to be welded, and the closer the workpiece to be welded, the better. However, when the workpiece to be welded is a thin plate with a large area, the pressing of the workpiece to be welded will be a difficult problem in welding practice. It is a common practice to clamp large-area workpieces to be welded with large-scale special fixtures. In addition, there is still the problem of deformation in thin plate welding, and the deformation of large-area thin plate welding is even more difficult to predict and suppress, which often leads to failure to meet product accuracy requirements. Furthermore, during the welding process, the friction stir tool provides considerable downward pressing force on the workpiece to be welded, which is more likely to cause deformation and burrs around the weld bead for thin plates, affecting the appearance of the product.

The following patent documents respectively propose solutions to the above-mentioned thin plate welding problems:

Chinese Patent No. CN 102672345 A discloses a friction stir welding tool and its welding method suitable for thin plates. The welding tool includes a stirring head, a radial positioning bearing, a pressing slider and a fixed frame, and a radial positioning bearing. Set on the outer wall of the mixing head, the down-pressing slider is fixedly installed on the lower surface of the fixed frame, the down-pressing slider and the fixing frame are integrally set on the outer side wall of the mixing head, and the radial positioning bearing is located on the outer side wall of the mixing head Between the inside wall of the fixed frame and the shaft shoulder of the stirring head and the stirring needle are exposed outside the lower surface of the pressing slide block. During the welding process, the sliding block is pressed down to press the workpiece to be welded to prevent the workpiece from warping and deforming.

Chinese patent number CN 104722910 A discloses a friction stir connection device capable of reducing deformation and removing flash, which consists of a stirring shaft, a pressure bearing block, a roller cage, rollers and a sleeve. The stirring shaft is fixed to the bearing block, and the bearing block and the sleeve are connected by the roller cage and the roller so as to be relatively rotatable. There is a gap between the sleeve and the stirring shaft, so the sleeve does not Rotate with the stirring shaft. During welding, the stirring shaft rotates and presses down driven by the main shaft, and the pressure-bearing block rotates synchronously, and transmits the downward pressure of the stirring shaft to the sleeve to apply pressure to the workpiece, so that the workpiece is fixed. When the stirring shaft moves along the welding direction, the bottom end of the sleeve in contact with the workpiece can remove the softened burrs.

Chinese Patent No. CN 209830594 U discloses a double-head friction stir welding device. During operation, the friction stir head acts on the part to be welded to form a weld seam, and the spinning head is located at a certain distance behind the friction stir head for the weld seam and the near seam area. Metal is spun. Rotary extrusion of the weld seam and metal near the seam can also be performed after the welding process has been completed. The longitudinal plastic extension of the weld seam reduces the longitudinal residual tensile stress of the weld seam and its surrounding area, thereby reducing the residual deformation of the thin plate weldment.

Although the above disclosed documents propose a technical solution to solve the problems arising from the welding of thin plates, there are still many shortcomings and inconveniences. How to provide a friction stir welding technical solution to solve the above-mentioned problem of thin plate welding has become one of the issues that people in this technical field are concerned about.

The purpose of the present invention is to provide a friction stir welding device, which can press and fix the workpiece to be welded, reduce the warping and deformation of the welded piece along the weld bead, and can remove the burr and simultaneously level the weld bead.

Another object of the present invention is to provide a friction stir welding device capable of counteracting at least part of the torque applied by the welding tool to the workpiece to be welded.

Another object of the present invention is to provide a friction stir welding device, which can reduce the residual stress formed by welding.

According to the above-mentioned purpose, the present invention provides a friction stir welding device, which includes: a frame body; a shaft module connected to the frame body, including: an inner shaft; and a set of outer shafts arranged outside the inner shaft ; a welding tool fixedly connected to the inner rotating shaft; and a monolithic block sleeved on the outside of the welding tool and fixedly connected to the outer rotating shaft; when the welding tool performs friction stir welding on two workpieces to be welded, the The compacting block rotates and holds relative to the two workpieces to be welded, and the force of the compacting block to press the two workpieces to be welded is smaller than the force of the welding tool to press down the two workpieces to be welded.

In the friction stir welding device of the present invention, a pressing block is placed on the outer side of the welding tool. During the welding process, the pressing block moves and rotates with the welding tool to press and hold the workpiece to be welded, and can reduce the thickness of the weld. The parts warp and deform along the weld bead, and the weld bead can be leveled synchronously to remove the burrs formed by welding. When the turning of the pressing block is opposite to that of the welding tool, the friction force of the pressing block can offset at least a part of the torsion force applied by the welding tool to the workpiece to be welded, and can also reduce the residual stress formed by welding. By embedding the blade on the outer edge of the abutting surface of the monolithic block, the welding bead and its surroundings can be trimmed to obtain welded parts with high appearance quality.

1: Friction stir welding device

10: frame body

20: Shaft module

21: Inner shaft

22: Outer shaft

30: Welding tools

31: handle

32: Stirring needle

33: Shoulder

40, 40’, 40”, 40''': pressed into a whole piece

41,41''': one end

42,42',42",42''': the other end

421, 421’, 421”, 421''': top contact surface

43: blade

44: Ball

45: Upper block

451: perforation

452: guide groove

46: lower block

461: perforation

462: guide pin

47: Elastic parts

50: Press down fixture

51: Pressing part

511: Roller

60: heating plate

110,120: workpiece to be welded

130: weld bead

200: Migration Module

Fig. 1 is a schematic structural view of an embodiment of the friction stir welding device of the present invention.

Fig. 2 is a schematic diagram of welding according to an embodiment of the present invention.

Fig. 3 is a top sectional view of welding according to an embodiment of the present invention.

Fig. 4 is a cross-sectional view of a compacted block capable of trimming a weld bead according to the present invention.

Fig. 5 is a cross-sectional view of a compacted block providing rolling contact according to the present invention.

Fig. 6 is a cross-sectional view of the monolithic block with adjustable holding force of the present invention.

In order to make the above or other purposes, features and characteristics of the present invention more obvious and easy to understand, the relevant embodiments of the present invention are described in detail below in conjunction with the drawings. Therefore, only the elements related to the present invention are marked in the drawings, and the drawn elements are not drawn in the number, size ratio, etc. during implementation, and the layout of the elements may be more complicated.

The directional terms mentioned in the description of the present invention, such as "upper", "lower", "front", "rear", "left", "right", "inside", "outside", "side", etc., are only Refer to the drawing for directions. The directional terms used are only used to illustrate and understand the present invention, but not to limit the present invention.

Fig. 1 is a structural schematic diagram of an embodiment of a friction stir welding device of the present invention, Fig. 2 is a schematic diagram of welding performed by an embodiment of a friction stir welding device of the present invention, and Fig. 3 is a schematic diagram of welding performed by an embodiment of a friction stir welding device of the present invention Cross-sectional view of welding. Please refer to FIGS. 1 to 3 together. The friction stir welding device 1 of this embodiment includes: a frame 10 , a rotating shaft module 20 , a welding tool 30 and a pressing block 40 .

The rotating shaft module 20 is fixed on the frame body 10, which includes: an inner rotating shaft 21 that can rotate relative to the frame body 10, and is used to drive the welding tool 30 to rotate for welding operations; and an outer rotating shaft 22, which is sleeved on the inner rotating shaft 21 The outer side can also rotate relative to the frame body 10 . The inner shaft 21 and the outer shaft 22 can be driven by the same power source (not shown), and the speed ratio and rotation direction of the two can be set through a gear set (not shown). The inner rotating shaft 21 and the outer rotating shaft 22 can also be driven by a power source respectively.

The welding tool 30 has a handle 31 , a stirring pin 32 and a shoulder 33 . The handle 31 is fixedly connected to the inner shaft 21 and rotates with it. The stirring pin 32 is used to friction stir the two workpieces 110 , 120 to be welded under high-speed rotation, and the heat energy generated by the friction softens the two workpieces 110 , 120 to be welded to form a weld bead 130 .

The compacting block 40 is sleeved on the outside of the welding tool 30 and is fixedly connected to the outer shaft 22 to be driven to rotate. When the welding tool 30 welds the two workpieces 110, 120 to be welded, the pressing block 40 rotates while pressing and holding the two workpieces 110, 120 to be welded synchronously, and the welding area just stirred by the welding tool 30 is still in a plastic flow state The continuous pressing of the compacting block 40 can reduce the warping deformation (angular deformation) of the thinner workpieces 110, 120 to be welded along the weld bead, and can be formed by the contact welding of the compacting block 40 in rotation at a higher speed The burrs are cut off and the weld bead 130 is leveled synchronously.

One end 41 of the pressing block 40 disclosed in FIG. 1 is connected to the outer shaft 22 , and the other end 42 has an abutting surface 421 for pressing two workpieces 110 , 120 to be welded and leveling the welding bead 130 . During the welding process, the abutting surface 421 of the monolithic block 40 is pressed against the surfaces of the two workpieces 110 and 120 to be welded and rotates, which will inevitably generate heat due to friction. Therefore, the monolithic block 40 must have high temperature strength, hardness and wear resistance. Its material can be selected from tool steel, preferably hot work tool steel, which is heat-treated to obtain the required mechanical properties.

Please refer to Fig. 3, the outer diameter of the abutting surface 421 should be greater than the width of the weld bead 130, so as to provide sufficient pressing area and holding force for the two workpieces 110, 120 to be welded, and avoid warping of the thinner workpieces 110, 120 to be welded during welding deform and have a leveling effect on the weld bead 130 . In one application, the outer diameter of the abutting surface 421 is greater than or equal to three times the diameter of the stirring pin 32 of the welding tool 30 and less than or equal to seven times the diameter of the stirring pin 32 .

The rotational speed of the compacting block 40 (ie, the rotational speed of the outer shaft 22 ) is preferably greater than or equal to 300 rpm and less than or equal to 2000 rpm. In this way, the pressing block 40 can touch the burrs at a high speed to cut them off, and simultaneously level the welding bead 130 . The direction of rotation of the compaction block 40 may be the same as or opposite to the direction of rotation of the bonding tool 30 .

During the welding process, the abutting surface 421 of the monolithic block 40 is pressed against the surfaces of the two workpieces 110, 120 to be welded and rotated. The pressing and rotation will generate frictional force to provide a torque to the workpieces 110, 120 to be welded. When the pressing block 40 rotates opposite to the welding tool 30 , the torque applied to the workpieces 110 , 120 to be welded when the pressing block 40 rotates can offset at least part of the torque applied to the workpieces 110 , 120 to be welded by the welding tool 30 . The size of the torque provided by the compacting block 40 to the workpieces 110, 120 to be welded can be controlled by the force of the compacting block 40 against the workpieces 110, 120 to be welded, the coefficient of friction between the compacted block 40 and the workpieces 110, 120 to be welded, the size of the inner and outer diameters of the compacted block 40, etc. The parameters are calculated. Therefore, most of the torque applied by the welding tool 30 to the workpieces 110, 120 to be welded can be offset by the selection of the aforementioned operating parameters, thereby reducing the use of large, complex and special fixtures, and reducing the cost of the fixtures. For example, when the size and material of the pressing block 40 and the material of the workpieces 110, 120 to be welded are known, the operator can select the force that the pressing block 40 presses against the workpieces 110, 120 to be welded to offset the force exerted by the welding tool 30. Most of the torque on the workpieces 110,120 to be welded.

Friction stir welding causes severe flow (plastic deformation) of the material at the weld, thus easily causing residual stress at the weld. When the direction of rotation of the compact block 40 and the direction of rotation of the welding tool 30 On the contrary, the direction of the stress applied by the compact block 40 to the workpieces 110, 120 to be welded is just opposite to that applied by the welding tool 30, which helps to reduce the residual stress generated when the welding tool 30 friction stirs the two workpieces 110, 120 to be welded.

The friction stir welding device 1 of the present invention may further include a pair of pressing fixtures 50, the two pressing fixtures 50 are fixedly connected to the frame body 10 respectively, and are arranged on both sides of the rotating shaft module 20, and the two pressing fixtures 50 are respectively There is a pressing portion 51 , and when welding, the pressing portions 51 of the two pressing fixtures 50 apply pressure to a workpiece to be welded respectively, and move along with the frame body 10 along the welding direction. The two pressing fixtures 50 respectively located on both sides of the rotating shaft module 20 make the pressing range of the two workpieces 110, 120 to be welded larger, and can avoid angular deformation of the thinner workpieces 110, 120 to be welded during the welding process.

The pressing portion 51 is in rolling contact with the two workpieces 110, 120 to be welded. In practice, the pressing portion 51 can be formed by a roller (roller) 511, or a plurality of balls (not shown) arranged annularly at equal intervals. Reach the effect of rolling contact with the two workpieces 110,120 to be welded.

Referring to Fig. 2, the friction stir welding device 1 of the present invention may further include a heating plate 60, which can be used to place the two workpieces 110, 120 to be welded, and is used to heat and maintain the temperature of the two workpieces 110, 120 to be welded, so that the two workpieces 110, 120 to be welded The heating temperature of the part to be welded is maintained at 100~200°C, which can improve the leveling effect of the welded workpiece and reduce the occurrence of corner deformation.

Referring to Fig. 2 and Fig. 3, when intending to weld two workpieces 110, 120 to be welded with the friction stir welding device 1 of the present invention, at first, the two workpieces 110, 120 to be welded are placed on the working table (not shown), and the two workpieces to be welded The parts to be welded of the welding pieces 110, 120 are butted. If the two workpieces 110, 120 to be welded belong to large thin plates, they can be fixed on the worktable with jigs at the edges except the places to be welded.

The friction stir welding device 1 is erected on a traveling module 200 via its frame body 10 . The moving module 200 at least enables the welding tool 30 of the friction stir welding device 1 to be pressed down at the beginning of welding and penetrate into the to-be-welded parts of the two workpieces to be welded 110, 120, so that the welding tool 30 can move along the two workpieces to be welded. The places to be welded at 110, 120 move, and the welding tool 30 can be separated from the formed weld bead 130 after welding is completed.

Next, the moving module 200 moves the friction stir welding device 1 to the starting point of the welding place of the two workpieces 110 and 120 to be welded, as shown in the upper position in FIG. 3 . Afterwards, the rotating shaft module 20 is started to rotate the inner rotating shaft 21 and the outer rotating shaft 22, and respectively link the welding tool 30 and the pressing block 40 to rotate. The direction of rotation of the compaction block 40 may be the same as or opposite to the direction of rotation of the bonding tool 30 . During the rotation, driven by the traveling module 200 , the stirring needle 32 of the welding tool 30 touches and penetrates into the welding parts of the two workpieces 110 , 120 to be welded until the shoulder 33 touches the surfaces of the two workpieces 110 , 120 to be welded. At the same time, the abutting surface 421 of the pressing block 40 is just in contact with the surfaces of the two workpieces 110, 120 to be welded, so that the two workpieces 110, 120 to be welded can be pressed and fixed. The force of the abutting surface 421 of the pressing block 40 against the workpieces 110 , 120 to be welded is smaller than the force of the shoulder 33 of the welding tool 30 against the workpieces 110 , 120 to be welded.

Next, the traveling module 200 moves the friction stir welding device 1 along the welding direction of the two workpieces 110 and 120 to be welded (as shown by the arrows in FIG. 3 ), so that the welding tool 30 starts to perform friction stir welding. During the welding process, the welding tool 30 moves along the welding direction of the two workpieces 110 and 120 to be welded, and the pressing block 40 also moves accordingly and keeps pressing and rotating. The welded area that has just been stirred by the welding tool 30 is still in a plastic flow state, and the continuous pressing of the compact block 40 can reduce the warping deformation (angular deformation) of the thinner workpieces 110, 120 to be welded along the weld bead, and can remove burrs and Simultaneous leveling of the weld bead.

During the rotation process, both the pressing block 40 and the welding tool 30 will cause the workpieces 110, 120 to be welded to heat up due to friction. In the aforementioned operation mode, the force of the abutting surface 421 of the pressing block 40 against the workpieces 110, 120 to be welded is less than the force of the shoulder 33 of the welding tool 30 against the workpieces 110, 120 to be welded, and the pressure of the entire piece 40 against the workpieces 110, 120 to be welded produces The frictional force will be less than the frictional force produced by the shoulder 33 of the welding tool 30 to be welded workpieces 110,120 (for ease of illustration, it is assumed that the whole block 40 The material of the welding tool 30 is selected as hot work tool steel, and the coefficient of dynamic friction relative to the workpieces 110, 120 to be welded is the same), so the frictional heat provided by the compact block 40 to the workpieces 110, 120 to be welded will be less than that provided by the welding tool 30, so that The temperature gradient of the two workpieces to be welded 110, 120 near the welding bead 130 is moderate, which can reduce the thermal stress of the welded workpieces. In another mode of operation, the rotational speed of the compacted block 40 is lower than the rotational speed of the welding tool 30. Under the condition that the frictional force generated by the workpieces 110, 120 to be welded is the same, the frictional heat provided by the compacted block 40 per unit time to the workpieces 110, 120 to be welded It is smaller than that provided by the welding tool 30, and can also make the temperature gradient of the two workpieces 110, 120 to be welded near the welding bead 130 more moderate, and can reduce the thermal stress of the welded workpieces.

When the rotation direction of the compacting block 40 is opposite to that of the welding tool 30, the frictional force of the compacting block 40 can offset at least part of the torsion force applied by the welding tool 30 to the workpieces 110, 120 to be welded, and can also reduce the residue formed by welding. stress.

When performing friction stir welding, a pair of pressing fixtures 50 fixed to the frame body 10 can also move along the welding direction with the frame body 10, and the pressing parts 51 of the two pressing fixtures 50 respectively exert pressure on one waiting The welded workpieces can further provide a pressing and fixed force for the workpieces 110, 120 to be welded, and can avoid angular deformation of the thinner workpieces 110, 120 to be welded during the welding process.

After the welding operation of the workpieces 110 and 120 to be welded is completed, the traveling module 200 continues to move the friction stir welding device 1 so that the welding tool 30 and the compacted block 40 are separated from the weld bead 130 formed by welding.

Figure 4 is a cross-sectional view of another compacted block of the friction stir welding device of the present invention, please refer to Figure 4, the compacted block 40' disclosed in Figure 4 is roughly the same as that disclosed in Figure 1, the difference lies in the compacted At least one blade 43 is embedded on the outer edge of the abutting surface 421' of the other end 42' of the block 40'. When the embedded blades 43 are plural, the blades 43 are equidistantly arranged around the outer edge of the abutting surface 421'. When performing friction stir welding, the compact block 40' rotates under the drive of the outer rotating shaft 22, and the blade 43 also follows The pressing block 40' rotates and sweeps the surfaces of the workpieces 110, 120 to be welded, so that the welding bead 130 and its surroundings can be further trimmed to obtain welded parts with high appearance quality. The height of the blade edge is slightly higher than the height of the abutting surface 421', and the height difference between the two is between 0.01-0.1 mm, so as to avoid scratching the surfaces of the workpieces 110, 120 to be welded.

Fig. 5 is a cross-sectional view of another compacted block of the friction stir welding device of the present invention. The compacted block 40" disclosed in Fig. 5 is substantially the same as that disclosed in Fig. The abutting surface 421 ″ of the other end 42 ″ is embedded with a plurality of balls 44 arranged around and at equal intervals. When performing friction stir welding, the compacted block 40" is pressed against the workpiece to be welded and rotated. Since the abutment surface 421" is embedded with a plurality of balls 44, the compacted block 40" can be in rolling contact with the workpiece to be welded, which can reduce the The frictional heat generated by the friction of the workpiece to be welded by pressing the whole block 40".

The following is an embodiment of adjusting the pressing force of the compacted block. Figure 6 is a cross-sectional view of the pressing block with adjustable holding force of the present invention, please refer to Figure 2 and Figure 6 together, the pressing block 40'' disclosed in Figure 6 includes an upper block 45 and a lower block 46 and at least one elastic piece 47, one end 41''' of the upper block 45 is connected to the outer shaft 22 of the shaft module 20, and the other end 42''' of the lower block 46 has a abutting surface 421''' for pressing Hold two workpieces 110,120 to be welded. The upper block 45 and the lower block 46 each have a through hole 451 , 461 , and the through hole 451 , 461 has the same axis line (coincident axis), which can be used for the inner shaft 21 of the shaft module 20 or the welding tool 30 to pass through. The upper block 45 has a plurality of guide grooves 452 arranged around and recessed at equal intervals, and the lower block 46 is provided with a plurality of guide pins 462 protruding from the plurality of guide grooves 452 corresponding to the upper block 45 . In this example, the number of elastic pieces 47 is the same as the number of guide pins 462 of the lower block 46 , but it is not limited thereto, and there may be only one elastic piece 47 . When assembling the compacted block 40''' of this example, the plurality of elastic members 47 are respectively pierced on the guide pins 462 of the lower block 46, and then the plurality of guide grooves 452 of the upper block 45 are respectively aligned with the guide pins of the lower block 46. The pin 462 enables the plurality of guide pins 462 to penetrate into the plurality of guide grooves 452 , and the upper block 45 and the lower block 46 interpose a plurality of elastic members 47 to form a compact block 40 ″'. Press the whole block 40''' by complex The number guide pin 462 penetrates in the plurality of guide grooves 452 so that the upper block 45 and the lower block 46 can move relative to each other along the axial direction of the through holes 451, 461, and the torque from the outer shaft 22 can be transmitted from the upper block 45 to the lower block 46. synchronous rotation. In this example, the elastic member 47 is a compression spring.

When performing friction stir welding on the workpieces 110, 120 to be welded, driven by the travel module 200, the stirring pin 32 of the welding tool 30 touches and penetrates the to-be-welded parts of the two workpieces 110, 120 to be welded, and at the same time, presses the entire 40''' The abutting surface 421''' of the lower block 46 is also in contact with the surfaces of the two workpieces 110, 120 to be welded. The traveling module 200 continues to press down until the shoulder 33 of the welding tool 30 touches the surfaces of the two workpieces 110, 120 to be welded. At this time, the complex compression springs sandwiched between the upper block 45 and the lower block 46 bear the pressure applied by the traveling module 200. Compression and deformation due to the given force. When the compression spring has not yet reached its compaction length, the product of its elastic coefficient and deformation is the downward force of the compact block 40 ″ to hold the two workpieces 110 , 120 to be welded. Therefore, through the selection of the compression spring (ie, the elastic coefficient) and/or the pre-planning of its deformation, the desired amount of downforce can be obtained.

In the friction stir welding device of the present invention, a pressing block is placed on the outer side of the welding tool. During the welding process, the pressing block moves and rotates with the welding tool to press and hold the workpiece to be welded, and can reduce the thickness of the weld. The parts warp and deform along the weld bead, and the weld bead can be leveled synchronously to remove the burrs formed by welding. When the turning of the pressing block is opposite to that of the welding tool, the friction force of the pressing block can offset at least a part of the torsion force applied by the welding tool to the workpiece to be welded, and can also reduce the residual stress formed by welding. By embedding the blade on the outer edge of the abutting surface of the whole block, the welding bead and its surroundings can be further trimmed, and a welded part with high appearance quality can be obtained.

The above descriptions are only the preferred implementation modes or examples of the technical means adopted by the present invention to solve the problems, and are not intended to limit the scope of the patented implementation of the present invention. That is, all equivalent changes and modifications that are consistent with the scope of the patent application of the present invention, or made according to the scope of the patent of the present invention, are covered by the scope of the patent of the present invention.

1: Friction stir welding device

10: frame body

20: Shaft module

21: Inner shaft

22: Outer shaft

30: Welding tools

31: handle

32: Stirring needle

33: Shoulder

40: Press the whole block

41: one end

42: the other end

421: top contact surface

43: blade

50: Press down fixture

51: Pressing part

511: Roller

60: heating plate

Claims (8)

A friction stir welding device, comprising: a frame; a rotating shaft module connected to the frame, including: an inner rotating shaft; and an outer rotating shaft set outside the inner rotating shaft; a welding tool fixed to the Inner rotating shaft; and a pressing block, which is sleeved on the outside of the welding tool and fixedly connected to the outer rotating shaft; when the welding tool performs friction stir welding on two workpieces to be welded, the pressed block is opposite to the two workpieces to be welded Rotate and press the two workpieces to be welded, the force of the pressing block to press the two workpieces to be welded is less than the force of the welding tool to press the two workpieces to be welded; wherein one end of the compacted block is connected to the outer shaft, The other end has an abutting surface for pressing the two workpieces to be welded and leveling a weld bead formed by the welding tool; and the outer diameter of the abutting surface is greater than or equal to the diameter of the stirring pin of the welding tool 3 times, and less than or equal to 7 times the diameter of the stirring needle. The friction stir welding device as claimed in claim 1, wherein the rotation direction of the outer shaft is opposite to that of the inner shaft. The friction stir welding device according to claim 1 or claim 2, wherein the rotational speed of the compacted block is lower than the rotational speed of the welding tool. A friction stir welding device, comprising: a frame; a shaft module connected to the frame, including: an inner shaft; and a set of outer rotating shaft set outside the inner rotating shaft; a welding tool fixedly connected to the inner rotating shaft; When two workpieces to be welded are subjected to friction stir welding, the compacting block rotates relative to the two workpieces to be welded and presses and holds the two workpieces to be welded, and the force of the compacting block to hold the two workpieces to be welded is less than that of the welding tool The strength of the two workpieces to be welded; wherein one end of the compact block is connected to the outer shaft, and the other end has an abutting surface for pressing the two workpieces to be welded and forming a weld bead on the welding tool leveling; and a plurality of balls are embedded in the abutting surface, so that the compacted block is in rolling contact with the two workpieces to be welded. A friction stir welding device, comprising: a frame; a rotating shaft module connected to the frame, including: an inner rotating shaft; and an outer rotating shaft set outside the inner rotating shaft; a welding tool fixed to the Inner rotating shaft; and a pressing block, which is sleeved on the outside of the welding tool and fixedly connected to the outer rotating shaft; when the welding tool performs friction stir welding on two workpieces to be welded, the pressed block is opposite to the two workpieces to be welded Rotate and press the two workpieces to be welded, the force of the pressing block to press the two workpieces to be welded is less than the force of the welding tool to press the two workpieces to be welded; wherein one end of the compacted block is connected to the outer shaft, The other end has an abutting surface for pressing the two workpieces to be welded and leveling a bead formed by the welding tool; and the outer edge of the abutting surface is provided with at least one blade for trimming A weld bead formed by the welding tool and its surroundings. A friction stir welding device, comprising: A frame; a rotating shaft module connected to the frame, including: an inner rotating shaft; and a set of outer rotating shafts arranged outside the inner rotating shaft; a welding tool fixedly connected to the inner rotating shaft; , sleeved on the outside of the welding tool, and fixed to the outer shaft; when the welding tool performs friction stir welding on two workpieces to be welded, the compact block rotates relative to the two workpieces to be welded and the two workpieces to be welded Pressing and holding, the force of the pressing block to hold the two workpieces to be welded is less than the force of the welding tool to press down the two workpieces to be welded; wherein one end of the pressing block is connected to the outer shaft, and the other end has an abutting surface , for pressing the two workpieces to be welded and leveling a weld bead formed by the welding tool; and the pressing block includes: an upper block, one end of which is fixedly connected to the outer shaft of the shaft module, and the other The upper block has a first through hole; one end of the lower block protrudes from the plurality of guide grooves corresponding to the upper block, and a plurality of guide pins are protruded, and the other end is the abutment On the surface, the lower block has a second perforation, the first perforation and the second perforation have the same axis line, for the inner shaft or the welding tool to penetrate; and at least one elastic member; when the compacted block is assembled , the plurality of guide pins correspondingly pass through the plurality of guide grooves, and the at least one elastic member is sandwiched between the upper block and the lower block. In the friction stir welding device as claimed in claim 6, when performing friction stir welding, the pressing force of the compact block to press the two workpieces to be welded is equal to the product of the elastic coefficient of the at least one elastic member and its deformation. The friction stir welding device as described in claim 1 or 6, further comprising: A pair of pressing jigs, the pair of pressing jigs are fixedly connected to the frame body respectively, and are arranged on both sides of the shaft module, the pair of pressing jigs respectively have a pressing part; when welding, the A workpiece to be welded is respectively pressed against the pressing part of the pressing fixture, and is moved relative to the workpiece to be welded.

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