Special concave device for preventing end face of friction stir welding knife handle from being abraded

Abstract

The utility model relates to the technical field of friction stir welding components, in particular to a special concave device for preventing the end face of a friction stir welding knife handle from being abraded. The stirring device comprises a cutter handle and a stirring head coaxially installed at the front end of the cutter handle, an ejector pin bolt is coaxially matched with threads in the cutter handle, and the front end of the ejector pin bolt penetrates through the cutter handle and forms an abutting end used for directly abutting against the rear end of the stirring head. A locating ring groove is formed in the periphery of the ejector pin bolt, and a limiting pin which is distributed with the ejector pin bolt in a crossed mode and inserted into the locating ring groove is installed on the cutter handle. Abrasion of the front end of the cutter handle can be reduced, and welding quality reduction caused by backward movement of the stirring head is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of stir friction welding components, in particular to a special device for preventing end surface wear and concavity of a stir friction welding tool handle. Background Art

[0002] Friction stir welding is a solid phase welding technology. Its core welding tool is called a stirring head. When in use, it is usually fixed in the inner hole of the tool holder clamp through a side top screw to connect it to the spindle end. During the welding process, the spindle rotates at high speed, driving the tool holder to rotate, and then driving the stirring head to rotate, and there is a tendency to rotate one after the other; in addition, during the friction stir welding process, there will be a large axial pressure and a certain temperature will be transmitted to the assembly surface of the stirring head and the tool holder; at the same time, the hardness of the better stirring head material is higher than the hardness of the tool holder assembly end face. Therefore, when the plunger and welding work are repeated for a long time, the front end face of the tool holder will be worn and concave. Compared with the surface cutting machining center, the friction stir welding tool holder will fail more frequently than it.

[0003] In addition, this type of wear and concave tool handle end face will also lead to other related problems: a larger wear and concave value will cause the stirring head to retreat by a corresponding length, which has an important impact on the product weld formation and depth requirements. If the serious wear state is not discovered in time, it will cause root defects such as lack of fusion and lack of penetration in the workpiece, ultimately reducing the weld strength and affecting the internal quality of the weld. At the same time, frequent replacement of worn concave tool handles will also increase production costs and reduce production efficiency, so it needs to be solved urgently. Utility Model Content

[0004] In order to avoid and overcome the technical problems existing in the prior art, the utility model provides a special device for preventing end surface wear and concavity of a stir friction welding shank, which can reduce the wear on the front end of the shank and prevent the welding quality from being reduced due to the retreat of the stirring head.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A special device for preventing end face wear and concavity of a friction stir welding tool handle comprises a tool handle and a stirring head coaxially installed at the front end of the tool handle, a coaxial thread in the tool handle is matched with an ejector bolt, the front end of the ejector bolt passes through the tool handle and constitutes an abutment end for directly abutting the rear end of the stirring head; a positioning ring groove is provided on the outer periphery of the ejector bolt, and a limit pin is installed on the tool handle, which is cross-distributed with the ejector bolt and inserted into the positioning ring groove.

[0007] As a further solution of the utility model: the limit pin is a two-section stepped shaft structure with a thick outer side and a thin inner side, and the large diameter section of the limit pin is provided with a thread, and the side wall of the tool handle is radially provided with a first screw hole, and the first screw hole is threadedly connected to the large diameter section of the limit pin; the small diameter section of the limit pin is a smooth cylindrical structure, and the diameter of the small diameter section of the limit pin is the same as the groove width of the positioning ring groove, and is plug-fitted with the positioning ring groove.

[0008] As a further solution of the utility model: the ejector bolt is a two-section stepped shaft structure which is thin at the front and thick at the back; the large diameter section of the ejector bolt is provided with a thread; a second screw hole which is screwed to the large diameter thread of the ejector bolt is provided in the tool handle; the small diameter section of the ejector bolt is a smooth cylindrical structure; the positioning ring groove is located in the small diameter section of the ejector bolt; the small diameter section of the ejector bolt passes through the tool handle until it abuts against the stirring head.

[0009] As a further solution of the utility model: the front end and the rear end of the ejector bolt are coaxially provided with a front hexagonal hole and a rear hexagonal hole respectively.

[0010] As a further solution of the utility model: the inner cavity of the ejector bolt is coaxially arranged with a guide hole penetrating the ejector bolt to guide the cooling medium from the rear end of the ejector bolt to the rear end of the stirring head.

[0011] As a further solution of the utility model: the rod body on the mixing head installed in the handle is the connecting section, and the rod body on the mixing head located outside the handle is the working section. A drainage hole is provided inside the mixing head, and the drainage hole passes through the rear end of the connecting section and the outer side wall of the working section, and the opening of the drainage hole located at the rear end of the connecting section is connected to the exhaust end of the guide hole.

[0012] As a further solution of the utility model: the drainage hole is located on the outer side wall of the working section and has a plurality of openings, and the plurality of openings are evenly distributed circumferentially around the axis of the stirring head.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The front end face of the ejector bolt is used to abut against the rear end face of the mixing head, which reduces the wear of the mixing head on the front end of the tool handle and prevents the mixing head from moving toward the rear end of the tool handle. In addition, a positioning ring groove is provided on the outer periphery of the ejector bolt, and a limit pin is installed on the tool handle, which is cross-distributed with the ejector bolt and inserted into the positioning ring groove, effectively preventing the ejector bolt from loosening during vibration.

[0015] 2. The limit pin is a two-stage stepped shaft structure with a thick outer part and a thin inner part, and the large diameter section of the limit pin is provided with threads. The side wall of the shank is radially provided with a first screw hole, and the first screw hole is threadedly connected with the large diameter section of the limit pin, which ensures the convenience of the installation of the limit pin. The small diameter section of the limit pin is a smooth cylindrical structure. The diameter of the small diameter section of the limit pin is the same as the groove width of the positioning ring groove, and is plugged into the positioning ring groove. The section where the limit pin is inserted into the positioning ring groove is not provided with threads, which not only prevents the section of the thread from abutting against the positioning ring groove to cause thread deformation, thereby causing the limit pin to be stuck, but also prevents thread deformation from causing the limit of the ejector bolt to loosen.

[0016] 3. The convenience of installing the ejector bolt is improved by using the threaded connection of the large shaft diameter section and the sliding connection of the small shaft diameter section. In addition, the positioning ring groove is set on the outer periphery of the small shaft diameter section without destroying the thread continuity of the large shaft diameter section, thereby reducing the difficulty of processing the ejector bolt.

[0017] 4. A front hexagonal hole and a rear hexagonal hole are coaxially provided at the front and rear ends of the ejector bolt, respectively. With the setting of the front hexagonal hole, even if the ejector bolt moves backward, the stirring head can be disassembled, and the installation tool can be inserted into the front hexagonal hole through the front end of the tool handle to rotate the ejector bolt to move the ejector bolt forward, effectively preventing the ejector bolt from loosening and moving backward, which would cause the hydraulic loosening tool claws of the spindle to be blocked, thereby preventing the tool loosening function from being unable to be realized.

[0018] 5. The inner cavity of the ejector bolt is coaxially arranged with a guide hole that penetrates the ejector bolt to guide the cooling medium from the rear end of the ejector bolt to the rear end of the mixing head, which can realize the cooling of the mixing head. In addition, the guide hole is coaxially arranged with the ejector bolt, so that the front and rear openings of the guide hole will not rotate eccentrically with the rotation of the tool handle, which is convenient for the cooling medium to be introduced into the guide hole, and also provides a technical platform for the connection between the guide holes when the guide holes are opened in the mixing head in the later stage.

[0019] 6. Through the setting of the drainage hole, the cooling medium discharged from the drainage hole can be guided to the inside of the stirring head to cool the inside of the stirring head. In addition, the drainage hole runs through the outer wall of the working section to discharge the cooling medium after heat exchange; and the temperature of the cooling medium after heat exchange in the drainage hole is still lower than the working section temperature of the stirring head, and the outer wall of the stirring head can also be cooled by the cooling medium discharged from the drainage hole.

[0020] 7. The drainage hole is located on the outer wall of the working section and has a plurality of openings, which are evenly distributed around the axis of the mixing head, ensuring the uniformity of the cooling of the mixing head by the cooling medium discharged from the drainage hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a cross-sectional structural schematic diagram of the utility model.

[0022] Figure 2 It is a schematic diagram of the main structure of the utility model.

[0023] Figure 3 It is a schematic diagram of the explosion structure of the utility model.

[0024] Figure 4 It is a schematic cross-sectional structure diagram of the ejector bolt in the utility model.

[0025] In the figure: 10, tool handle; 11, first screw hole; 12, second screw hole; 20, stirring head; 21, drainage hole; 30, ejector bolt; 31, rear hexagonal hole; 32, front hexagonal hole; 33, drainage hole; 34, positioning ring groove; 40, limit pin. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] For ease of understanding, the specific structure and working mode of the utility model are further described below in conjunction with the accompanying drawings:

[0028] The specific structure of the utility model refers to Figure 1-4As shown, its main structure includes a tool handle 10 and a stirring head 20 coaxially installed at the front end of the tool handle 10, and a coaxial thread in the tool handle 10 is matched with an ejector bolt 30. The front end of the ejector bolt 30 passes through the tool handle 10 and constitutes an abutment end for directly abutting the rear end of the stirring head 20. The front end face of the ejector bolt 30 abuts the rear end face of the stirring head 20, which reduces the wear of the stirring head 20 on the front end of the tool handle 10 and prevents the stirring head 20 from moving toward the rear end of the tool handle 10. Further, in order to prevent the ejector bolt 30 from loosening during vibration, a positioning ring groove 34 is provided on the outer periphery of the ejector bolt 30, and a stop pin 40 is installed on the tool handle 10, which is cross-distributed with the ejector bolt 30 and inserted into the positioning ring groove 34; the stop pin 40 is inserted into the positioning ring groove 34 of the ejector bolt 30, which prevents the ejector bolt 30 from moving along its own axial direction, effectively preventing the ejector bolt 30 from loosening. In addition, on the basis that the ejector bolt 30 uses the meshing between the threads to prevent the stirring head 20 from retreating, after the limit pin 40 is inserted into the positioning ring groove 34, the clamping of the ejector bolt 30 by the limit pin 40 is also used to assist the ejector bolt 30 in preventing the stirring head 20 from retreating, effectively ensuring the effect of the ejector bolt 30 in preventing the stirring head 20 from retreating. Specifically, the cross distribution of the stop pin 40 and the ejector bolt 30, preferably the stop pin 40 and the ejector bolt 30 are vertically crossed. In this distribution state, the driving force for the stop pin 40 to slide outward is minimal, which effectively ensures the stability of the installation of the stop pin 40.

[0029] On the basis of the above, if Figure 1 As shown, the stop pin 40 is a two-stage stepped shaft structure with a thick outer portion and a thin inner portion, and the large diameter section of the stop pin 40 is provided with a thread, and the side wall of the tool handle 10 is radially provided with a first screw hole 11, and the first screw hole 11 is threadedly connected with the large diameter section of the stop pin 40. The threaded connection between the large diameter section of the stop pin 40 and the first screw hole 11 ensures the convenience of installation of the stop pin 40. The small diameter section of the stop pin 40 is a smooth cylindrical structure, and the diameter of the small diameter section of the stop pin 40 is the same as the groove width of the positioning ring groove 34, and is plugged and matched with the positioning ring groove 34. The method of not providing a thread in the section where the stop pin 40 is inserted into the positioning ring groove 34 not only prevents the section of thread from abutting against the positioning ring groove 34 to cause thread deformation, thereby causing the stop pin 40 to get stuck, but also prevents the thread deformation from causing the limit of the ejector bolt 30 to loosen. Of course, in a specific implementation, the limit pin 40 can also be fixed to the shank 10 by screws, or an installation rod intersecting with the limit pin 40 and penetrating the limit pin 40 can be slidably set on the shank 10 to achieve fixed installation of the limit pin 40.

[0030] On the basis of the above, if Figure 1As shown, the ejector bolt 30 is a two-stage stepped shaft structure with a thin front and a thick back. The large diameter section of the ejector bolt 30 is provided with a thread, and the tool handle 10 is provided with a second screw hole 12 that is screwed with the large diameter thread of the ejector bolt 30; the small diameter section of the ejector bolt 30 is a smooth cylindrical structure, and the positioning ring groove 34 is located in the small diameter section of the ejector bolt 30. The small diameter section of the ejector bolt 30 passes through the tool handle 10 until it abuts against the stirring head 20. The large diameter section of the ejector bolt 30 is screwed and installed with a thread, and the small diameter section is slidably plugged, which improves the convenience of installing the ejector bolt 30. In addition, the positioning ring groove 34 is set on the periphery of the small diameter section, which does not destroy the continuity of the thread of the large diameter section, and reduces the difficulty of processing the ejector bolt 30.

[0031] Furthermore, the loosening of the ejector bolt 30 will cause the spindle hydraulic loosening tool clamping claw to be blocked, resulting in the inability to achieve the tool loosening function, and the tool handle 10 can only be removed by destructive cutting. Figure 4 As shown, a front hexagonal hole 32 and a rear hexagonal hole 31 are coaxially formed at the front and rear ends of the ejector bolt 30, respectively. The rear hexagonal hole 31 is provided for plugging and cooperating with the installation tool when the ejector bolt 30 is installed. The front hexagonal hole 32 is provided, so that even if the ejector bolt 30 moves backward, the installation tool can be inserted into the front hexagonal hole 32 through the front end of the tool handle 10 after the stirring head 20 is disassembled, and the ejector bolt 30 is rotated to move forward, thereby effectively preventing the ejector bolt 30 from loosening and moving backward, which would cause the hydraulic loosening tool claw of the spindle to be blocked, thereby preventing the tool loosening function from being unable to be realized.

[0032] On the basis of the above, if Figure 1 As shown, in order to achieve heat dissipation of the stirring head 20, the inner cavity of the ejector bolt 30 is coaxially arranged with a guide hole 33 that penetrates the ejector bolt 30, so as to guide the cooling medium from the rear end of the ejector bolt 30 to the rear end of the stirring head 20. In addition, the guide hole 33 is coaxially arranged with the ejector bolt 30, so that the front and rear openings of the guide hole 33 will not rotate eccentrically with the rotation of the tool handle 10, which is convenient for the cooling medium to be introduced into the guide hole 33, and also provides a technical platform for the guide hole 33 to be connected with the guide hole 21 when the guide hole 21 is opened in the stirring head 20 in the later stage.

[0033] Further, such as Figure 1As shown, the shaft of the mixing head 20 installed in the handle 10 is the connecting section, and the shaft of the mixing head 20 located outside the handle 10 is the working section. A drainage hole 21 is provided inside the mixing head 20, and the drainage hole 21 passes through the rear end of the connecting section and the outer wall of the working section, and the opening of the drainage hole 21 located at the rear end of the connecting section is connected to the exhaust end of the guide hole 33. Through the setting of the drainage hole 21, the cooling medium discharged from the guide hole 33 can be guided to the inside of the mixing head 20 to cool the inside of the mixing head 20. In addition, the drainage hole 21 passes through the outer wall of the working section to discharge the cooling medium after heat exchange; and the temperature of the cooling medium after heat exchange in the drainage hole 21 is still lower than the temperature of the working section of the mixing head 20, and the outer wall of the mixing head 20 can also be cooled by the cooling medium discharged from the drainage hole 21.

[0034] Furthermore, the outer wall of the drainage hole 21 located in the working section has a plurality of openings, and the plurality of openings are evenly distributed circumferentially around the axis of the stirring head 20 , thereby ensuring uniformity in cooling the stirring head 20 by the cooling medium discharged from the drainage hole 21 .

[0035] Of course, for those skilled in the art, the present invention is not limited to the details of the exemplary embodiments described above, but also includes the same or similar structures that can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, so it is intended to include all changes that fall within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0036] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0037] The technology, shape and structure parts not described in detail in the present invention are all known technologies.

Claims

1. A special device for preventing end surface wear and concavity of friction stir welding tool handle, It is characterized in that The invention comprises a knife handle (10) and a stirring head (20) coaxially mounted on the front end of the knife handle (10); a coaxial thread in the knife handle (10) is matched with a pin bolt (30); the front end of the pin bolt (30) passes through the knife handle (10) and forms an abutment end for directly abutting the rear end of the stirring head (20); a positioning ring groove (34) is formed on the outer periphery of the pin bolt (30); and a limit pin (40) is installed on the knife handle (10) and is cross-distributed with the pin bolt (30) and inserted into the positioning ring groove (34).

2. A special device for preventing end surface wear and concavity of a friction stir welding tool handle according to claim 1, It is characterized in that The limit pin (40) is a two-stage stepped shaft structure with a thick outer portion and a thin inner portion, and the large diameter section of the limit pin (40) is provided with a thread, and a first screw hole (11) is radially opened on the side wall of the tool handle (10), and the first screw hole (11) is threadedly screwed with the large diameter section of the limit pin (40); the small diameter section of the limit pin (40) is a smooth cylindrical structure, and the diameter of the small diameter section of the limit pin (40) is the same as the groove width of the positioning ring groove (34), and is plug-fitted with the positioning ring groove (34).

3. A special device for preventing end surface wear and concavity of a friction stir welding tool handle according to claim 1, It is characterized in that The ejector bolt (30) is a two-stage stepped shaft structure with a thin front and a thick rear. The large diameter section of the ejector bolt (30) is provided with a thread, and the tool handle (10) is provided with a second screw hole (12) screwed to the large diameter thread of the ejector bolt (30); the small diameter section of the ejector bolt (30) is a smooth cylindrical structure, the positioning ring groove (34) is located in the small diameter section of the ejector bolt (30), and the small diameter section of the ejector bolt (30) passes through the tool handle (10) until it abuts against the stirring head (20).

4. A special device for preventing end surface wear and concavity of a friction stir welding tool handle according to claim 3, It is characterized in that The front end and the rear end of the ejector bolt (30) are coaxially provided with a front hexagonal hole (32) and a rear hexagonal hole (31), respectively.

5. A special device for preventing end surface wear and concavity of a friction stir welding tool handle according to any one of claims 1 to 4, It is characterized in that The inner cavity of the ejector bolt (30) is coaxially arranged with a guide hole (33) penetrating the ejector bolt (30) so as to guide the cooling medium from the rear end of the ejector bolt (30) to the rear end of the stirring head (20).

6. A special device for preventing end surface wear and concavity of a friction stir welding tool handle according to claim 5, It is characterized in that The shaft of the stirring head (20) installed in the handle (10) is the connecting section, and the shaft of the stirring head (20) located outside the handle (10) is the working section. A drainage hole (21) is provided inside the stirring head (20). The drainage hole (21) passes through the rear end of the connecting section and the outer side wall of the working section, and the opening of the drainage hole (21) located at the rear end of the connecting section is connected to the exhaust end of the guide hole (33).

7. A special device for preventing end surface wear and concavity of a friction stir welding tool handle according to claim 6, It is characterized in that The drainage hole (21) is located on the outer side wall of the working section and has a plurality of openings, and the plurality of openings are evenly distributed circumferentially around the axis of the stirring head (20).

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