JP2014142031A - Two-stage method for joining components and nut for one-stage joining components used for the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of bolts necessary during friction joining a plurality of plate-like members, by dividing the joining process into two steps.SOLUTION: A nut 1 for one-stage joining components is fabricated by integrally connecting a cylindrical part 2 having female threads engraved on one end part in an axial direction and a tool fitting part 4 having a hexagon-shaped contour of the other end part in an axial direction via a fracture part 5 with a small wall thickness. At a first step of the joining process, the plate-like member 10 is overlapped with the plate-like member 11; the nut 1 for one-stage joining components is fastened around a torque shear type high-strength bolt 6 which is inserted into corresponding bolt insertion holes 10a and 11a using a shear wrench, and the plate-like members 10 and 11 are one-stage joined by the cylindrical part 2 which is fastened by a fastening torque corresponding to the torque when the fracture part 5 is breaking. At a second step of the joining process, the plate-like member 12, on which a bolt insertion hole 12a is bored, is overlapped, the diameter of the insertion hole 12a being capable of receiving the cylindrical part 2; and all the plate-like members 10, 11, and 12 are friction joined together by finally fastening a nut 9 around the same torque shear type high-strength bolt 6.

Description

  In the present invention, after the first-stage joining of a plurality of plate-like members arranged in an overlapping manner, another plate-like member is further piled up to perform the second-stage joining, and the entire laminated members are friction-joined. The present invention relates to a two-stage joining method for members used for the purpose and a member one-stage joining nut used for the first-stage joining of the method.

  When constructing a steel structure, a structure may be adopted in which three or more plate-like members are overlapped and friction bonded.

  By the way, for example, when three sheets of plate-like members are overlapped to perform friction bonding, the first and second plate-like members are overlapped and bonded first for the convenience of the construction procedure, and thereafter The third plate member may be overlapped and further joined to the joined body of the first and second plate members.

  A general method for joining in such a procedure is to first insert the first and second plate-like members into the bolt insertion holes formed in the arrangement corresponding to the respective plate-like members. First-stage friction welding is performed using the arranged high strength bolt and a nut screwed to the high strength bolt.

  Next, the bolt head or nut of the high-strength bolt used for the first-stage friction welding is provided on the surface of the second plate-like member opposite to the joint surface with the first plate-like member. The third plate-like member provided with an opening of a size that can accommodate the above is placed in an overlapping manner.

  Next, the high-strength bolts used for the first-stage frictional joining in the first and second plate-like members and another bolt insertion hole provided in an arrangement corresponding to the third plate-like member. Another high-strength bolt is inserted and arranged, and a nut is fastened to the other high-strength bolt, whereby the three plate-like members are frictionally joined.

  As another joining method, a bolt insertion hole is previously formed in the first and second plate-like members in an arrangement corresponding to each other, while a third plate-like member is provided with the bolt insertion hole. An opening having a size capable of accommodating a bolt head or nut of a high-strength bolt is provided at a corresponding location. Further, the second plate member and the third plate member are provided with different bolt insertion holes in an arrangement corresponding to each other, while the first plate member has a portion corresponding to the other bolt insertion hole. In addition, an opening having a size capable of accommodating a bolt head of a high-strength bolt or a nut for fastening is provided.

  In this state, first, the first and second plate-like members are friction-joined using high-strength bolts and nuts that are inserted into the corresponding bolt holes.

  Next, the bolt head or nut of the high-strength bolt used for the first and second friction joining is accommodated in the opening of the third plate member, and the third plate member is The second plate-like member is placed on the opposite side of the first plate-like member from the joining side.

  Next, inside the opening of the first plate member, another high-strength bolt and nut inserted and arranged in another bolt insertion hole provided in the second and third plate members, Friction joining between the second and third plate-like members is performed. As a result, the first and third plate-like members are joined together via the second plate-like member.

  By the way, as one of the lock nuts, it is rotated by a tool (jig) on one end side (rear end side) in the axial direction of the lock nut body provided with an internal thread portion to be screwed to the inner peripheral surface. A ring provided with a rotation operation part for operation, and provided with a notch that breaks with a predetermined torsional load between the lock nut body and the rotation operation part, and further provided on the outer surface of the lock nut body Conventionally proposed is a structure in which an idle ring is rotatably mounted on the receiving portion.

  In the lock nut having such a configuration, after the rotation operation portion is rotated by a tool and the lock nut main body is screwed onto the bolt, a torsion load greater than the predetermined torsion load is applied to the rotation operation portion. By doing so, it is supposed that the lock nut main body with the notch being broken and the idle ring rotatably mounted on the bolt can be left on the bolt (see, for example, Patent Document 1).

  Moreover, as one of the temporary fixing nuts for temporarily fixing the bolt inserted and arranged in the bolt insertion hole of the plate-like member so as not to drop into the bolt insertion hole of the plate-like member, a bolt with an integrated rust prevention cap Temporary fixing nuts have been proposed in the past.

  Such a rust preventive cap integrated bolt temporary fixing nut is on the other end side in the axial center direction of the bolt temporary fixing nut body in which one end side in the axial direction is smaller than the bolt insertion hole of the plate-like member on which the bolt is temporarily fixed. The opening side end of the rust prevention cap part that can cover the shaft part of the bolt is attached integrally, and both can be separated at the boundary part between the bolt temporary fixing nut body and the rust prevention cap part. The cutting mechanism is configured to have a cutting mechanism.

  Furthermore, it is also proposed that a wrench fitting portion is provided at the axial center position of the non-opening side end portion opposite to the opening side end portion in the rust prevention cap portion (for example, Patent Document 2). reference).

JP 2000-240632 A JP 2010-78074 A

  However, in the conventional method of joining the three plate-like members by two-stage bolt fastening, separate bolts are used in the first-stage joining process and the second-stage joining process. The number will increase.

  Further, as the number of bolts used for the joining increases, the number of bolt insertion holes formed in each plate-like member to be joined increases. Furthermore, since it is necessary to provide each plate-like member with an opening for accommodating the bolt head and nut as needed, the above-described bolt insertion hole drilling operation or opening for the plate-like member to be joined is required. There is a problem that the labor and time required for the processing work for providing the material increases.

  The one disclosed in Patent Document 1 is a lock nut that is screwed onto a bolt to prevent loosening of a nut used to fasten a predetermined member, and three or more plate-like members are friction-joined. In that case, Patent Document 1 does not show any idea about a joining method in which some plate-like members are laminated and joined in advance, and then all the plate-like members are joined. .

  In addition, the lock nut disclosed in Patent Document 1 can be removed by screwing the lock nut main body to the bolt and then breaking the rotary operation portion at the notch portion. In addition, it is necessary to provide a flange-like portion that protrudes to the outer periphery in order to lock the idle ring, on the rear end side of the lock nut body, in order to prevent the fall of the external idle ring. Furthermore, an idling ring having an outer diameter larger than that of the flange-shaped portion is an essential constituent requirement. Therefore, the lock nut cannot make the outer diameter dimension of the lock nut main body which remains in the state screwed to the bolt after the rotation operation portion is broken small.

  Patent Document 2 discloses a bolt temporary fixing nut integrated with a rust prevention cap having a function for temporarily fixing a bolt inserted and arranged in a bolt insertion hole of a plate-like member to a bolt insertion hole so as not to drop off. And, when three or more plate-like members are friction-joined, a joining method in which some of the plate-like members are laminated and joined in advance, and then all the plate-like members are joined. This idea is not shown at all in Patent Document 2.

  In addition, the rust prevention cap integrated bolt temporary fixing nut is shown in a configuration in which a wrench fitting portion is provided at the axial center position of the non-opening side end opposite to the opening side end of the rust prevention cap. However, the diameter of the wrench fitting portion is smaller than that of the bolt temporary fixing nut main body to be screwed onto the bolt. Moreover, since the wrench fitting portion is provided at the non-opening side end portion of the rust prevention cap portion for covering the shaft portion of the bolt, it is provided at a position away from the bolt temporary fixing nut body. Therefore, even if the wrench fitting portion is provided, it is difficult to apply a large axial force as in the case where the plate-like members are joined in advance to the bolt temporary fixing nut body.

  Therefore, in the present invention, after performing the first-stage joining process between a plurality of stacked plate-shaped members, the second-stage bonding process is further performed by stacking other plate-shaped members, and then stacked. When friction bonding the entire member, the number of high-strength bolts used can be reduced, and the labor and time required for processing operations such as drilling bolt insertion holes for the plurality of plate-like members can be reduced. It is an object of the present invention to provide a two-stage joining method for members that can be used, and a member single-stage joining nut used in the first stage joining step in the method.

  In order to solve the above-mentioned problem, the present invention corresponds to claim 1, wherein a plurality of plate-like members are overlapped and inserted into bolt insertion holes formed so as to correspond to the respective plate-like members. A nut for one-stage joining of members is screwed onto and tightened to the shaft portion of the arranged bolt to perform a first-stage joining step of joining the plurality of plate-like members in one stage. A plate-like member having a bolt insertion hole drilled at a location corresponding to the arrangement of the bolt used in the first-stage joining process is connected to the joined body, and the bolt and the member are joined to the bolt insertion hole of the plate-like member in a single step A second step of joining the nuts to the bolts is carried out from the outside of the plate-like members that are stacked after the nuts are inserted, and all the laminated plate-like members are attached to the bolts. -Stage joining method for members to be friction-joined by nut and nut To.

  Furthermore, in the above-described configuration, the nut for one-stage member joining is provided with a cylindrical portion in which an internal thread is engraved on the inner peripheral surface on one end side in the axial direction on the inner peripheral surface. Provided on the end side with a tool fitting part that allows the tool to be fitted to the outer peripheral part as an annular shape having an inner diameter larger than the outer diameter of the shaft part of the bolt, and between the cylindrical part and the tool fitting part In addition, a configuration in which the thickness in the radial direction is integrally connected via an annular fracture portion that is smaller than the thickness of either the tool fitting portion or the cylindrical portion is used.

  Furthermore, in the above configuration, a torcia type high strength bolt is used as a bolt, and as a member one-stage joining nut, the tool fitting portion has a hexagonal shape similar to a nut for final tightening to a torcia type high strength bolt, In addition, a member single-stage joining nut is used in which the breaking torque of the breaking portion is set to be smaller than the breaking torque of the pintail of the Torcia type high strength bolt.

  According to a fourth aspect of the present invention, there is provided a cylindrical portion engraved on the inner peripheral surface of a female screw for screwing the bolt into the shaft portion on one end side in the axial direction, and on the other end side in the axial direction. A tool fitting portion is provided that allows a tool to be fitted to the outer peripheral portion as an annular shape having an inner diameter larger than the outer diameter of the shaft portion of the bolt, and a radial direction is provided between the tubular portion and the tool fitting portion. The member is a one-stage joining nut having a structure in which the wall thickness is integrally connected via an annular fracture portion smaller than the wall thickness of either the tool fitting portion or the cylindrical portion.

  Further, in the above configuration, the tool fitting portion is a hexagonal shape similar to a nut that performs final tightening on the torcia type high strength bolt, and the breaking portion has a breaking torque of the breaking portion of the pin tail of the torcia type high strength bolt. The configuration is set to be smaller than the breaking torque.

According to the present invention, the following excellent effects are exhibited.
(1) After a plurality of plate-like members are joined in a first stage in the first stage joining process, another plate-like member is overlapped to perform a second stage joining process, which is used in the first stage joining process. Since the same bolt as the bolt can be used, it is possible to reduce the number of bolts used for friction-joining the entire laminated plate-like member.
(2) With the reduction in the number of bolts, the number of bolt insertion holes provided in each plate-like member can be reduced. In addition, it is possible to eliminate the need to provide openings for the purpose of accommodating bolt heads and nuts in the plate members. Therefore, it is possible to reduce labor and time required for processing operations such as drilling of bolt insertion holes for the respective plate-like members.
(3) A member for one-stage joining is provided with a cylindrical portion in which an internal thread is engraved on the inner peripheral surface on one end side in the axial direction and screwed to the shaft portion of the bolt, and on the other end side in the axial direction. A tool fitting portion is provided that allows a tool to be fitted to the outer peripheral portion as an annular shape having an inner diameter larger than the outer diameter of the shaft portion of the bolt, and a radial direction is provided between the tubular portion and the tool fitting portion. To a plate-like member to be joined in the second-stage joining process, by connecting them integrally through an annular fracture portion smaller than either the tool fitting portion or the cylindrical portion. The diameter of the bolt insertion hole to be drilled can be formed with a dimension that can accept only the cylindrical portion of the member single-stage joining nut.
(4) Furthermore, it is possible to easily and accurately manage the tightening torque when the plate-like members are joined in a first stage in the first stage joining process by the breaking torque of the breaking portion.
(5) Torcia type high strength bolts are used as bolts, and the nut for one-stage joining of the members is formed in the same hexagonal shape as the nut that performs final tightening of the tool fitting portion to the Torcia type high strength bolts, and the fractured portion is broken. By setting the torque to be smaller than the breaking torque of the pin tail of the Torcia type high strength bolt, the nut for one-stage joining of the member is fastened to the Torcia type high strength bolt corresponding to the breaking torque of the breaking portion. The operation of tightening with torque can be easily performed using a shear wrench.

The procedure in one Embodiment of the two-step joining method of the member of this invention is shown, (a) is the cutting | disconnection which shows the state which joined the two plate-shaped members using the high strength volt | bolt and the member single-step joining nut. A side view, (b) is a cut side view showing a state where a tool fitting portion of a member one-stage joining nut is broken and removed from a high strength bolt, (c) is a joined body of two plate-like members, 3 It is a cutting | disconnection side view which shows the state which joined the plate-shaped member of the sheet | seat further. FIG. 2 shows a member one-stage joining nut used in the implementation of the member two-stage joining method of FIG. 1, (a) is a schematic cut side view, and (b) is a schematic view showing a state of being screwed to a torcia-type high-strength bolt. It is a side view. FIG. 2 shows an application example of the member single-stage joining nut of FIG. 2 as still another embodiment of the present invention. FIG. 2A shows a configuration in which a notch extending continuously in the circumferential direction is provided on the outer peripheral surface of the fracture portion. (B) is a configuration in which a notch extending intermittently in the circumferential direction is provided on the outer peripheral surface of the fracture portion, (c) is a configuration in which a notch extending continuously in the circumferential direction is provided on the inner peripheral surface of the fracture portion, It is a partially cut schematic side view shown respectively.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  1 (a), (b), (c) and FIGS. 2 (a), (b) show an embodiment of the two-stage joining method for members of the present invention.

  Here, first, the structure of the member 1-stage joining nut 1 as shown in FIGS. 2A and 2B used for carrying out the two-stage joining method for members according to the present invention will be described.

  The member single-stage joining nut 1 is provided with a cylindrical portion 2 having an internal thread 3 engraved on the inner peripheral surface on one end side in the axial direction and screwed into the axial portion 7 of the high-strength bolt 6. On the other end side in the direction, provided with a tool fitting portion 4 that allows a tool (not shown) to be fitted to the outer peripheral portion as an annular shape having an inner diameter larger than the outer diameter of the shaft portion 7 of the high-strength bolt 6, And between the said cylindrical part 2 and the tool fitting part 4, it has an internal diameter larger than the outer diameter of the axial part 7 of the high strength volt | bolt 6, and the thickness t of radial direction has this tool fitting part 4 and It is configured to be integrally connected via an annular fracture portion 5 that is smaller (thin) than any thickness of the cylindrical portion 2.

  The tool fitting portion 4 has a hexagonal outer shape, for example, and can fit a tool (not shown) such as a wrench or a box wrench type socket. As a result, the member one-stage joining nut 1 causes the female screw 3 of the cylindrical portion 2 to be connected to the shaft of the high-strength bolt 6 by a rotational force applied by a tool (not shown) fitted to the tool fitting portion 4. It can be tightened with respect to the portion 7.

  Further, the above-mentioned member one-stage joining nut 1 is a tool (not shown) with respect to the tool fitting portion 4 from the state in which the female screw 3 of the cylindrical portion 2 is fastened to the shaft portion 7 of the high-strength bolt 6 as described above. When a load is applied so as to further rotate in the tightening direction, when the torque acting on the breaking portion 5 reaches a predetermined breaking torque preset in the breaking portion 5, the breaking portion 5 breaks. The tool fitting portion 4 can be separated from the cylindrical portion 2.

  Therefore, in the member 1-stage joining nut 1, the high-strength bolt is tightened with the tightening torque corresponding to the breaking torque of the breaking portion 5 when the breaking portion 5 is broken as described above. The shaft portion 7 can be tightened. On the other hand, the tool fitting portion 4 separated from the tubular portion 2 along with the breakage of the breakage portion 5 comes to idle around the shaft portion 7 of the high-strength bolt 6. 6 can be easily removed from the outer periphery of the shaft portion 7.

  Furthermore, as shown in FIG. 2 (b), when the torcia-type high-strength bolt 6 is used as the high-strength bolt 6, the member one-stage joining nut 1 has a breaking torque of the breaking portion 5, It is set smaller than the breaking torque of the pin tail 8 in the torcia type high strength bolt 6, and the outer shape of the tool fitting portion 4 is the same as the outer shape of the nut 9 that is finally tightened to the torcia type high strength bolt 6. A hexagonal shape is desirable. The member one-stage joining nut 1 having such a configuration uses a shear wrench (not shown) as an electric tool used when the tool fitting portion 4 is permanently tightened with the nut 9 against the torcia-type high-strength bolt 6. By rotating, the internal thread 3 of the cylindrical portion 2 can be fastened to the shaft portion 7 of the torcia type high strength bolt 6, and at this time, before the pin tail 8 of the torcia type high strength bolt 6 is broken. The tool fitting part 4 can be separated from the tubular part 2 by breaking the break part 5.

  Next, the member two-stage joining method of the present invention implemented using the member single-stage joining nut 1 having the above-described configuration will be described.

  In the two-stage joining method for members according to the present invention, first, as shown in FIG. 1 (a), the first plate-like member 10 and the second plate-like member 11 are overlapped as a first-stage joining step. The shaft of the torcia-type high-strength bolt 6 inserted from the outside of the first plate-like member 10 into the bolt insertion holes 10a, 11a drilled in correspondence with the plate-like members 10 and 11, respectively. The member one-stage joining nut 1 is screwed onto the portion 7 from the cylindrical portion 2 side.

  At this time, in order to stabilize the contact state of the cylindrical portion 2 with respect to the peripheral edge of the bolt insertion hole 11a of the second plate-like member 11, the cylindrical portion 7 has a cylindrical shape on the shaft portion 7 of the torcia-type high-strength bolt 6. It is desirable that the washer 13 having the same outer diameter as that of the part 2 is fitted, and then the member single-stage joining nut 1 is screwed.

  Next, the tool fitting portion 4 of the member one-stage joining nut 1 is rotated with a shear wrench (not shown). Thereby, the said cylindrical part 2 comes to be clamp | tightened by the axial part 7 of the said torcia type high strength volt | bolt 6. FIG.

  Next, when the tightening of the member one-stage joining nut 1 with the shear wrench (not shown) is continued, as shown in FIG. 1 (b), when the predetermined breaking torque is applied to the breaking portion 5, The rupture portion 5 is broken, and the tool fitting portion 4 is separated from the cylindrical portion 2 and is idled. Therefore, in this state, the cylindrical portion 2 is tightened with respect to the shaft portion 7 of the torcia-type high-strength bolt 6 with a tightening torque corresponding to the breaking torque of the breaking portion 5. The first plate-like member 10 and the second plate-like member 11 are frictionally joined in advance with an axial force corresponding to the above.

  The tool fitting part 4 separated from the cylindrical part 2 is removed from the outer periphery of the shaft part 7 of the torcia-type high-strength bolt 6 as shown in FIG.

  After that, as shown in FIG. 1C, as the second stage joining process, Torcia used in the first stage joining process, that is, the first stage joining of the first and second plate members 10 and 11 described above. A third plate member 12 in which a bolt insertion hole 12a having an inner diameter slightly larger than the outer diameter of the cylindrical portion 2 is previously drilled at a location corresponding to the arrangement of the high strength bolt 6 is used as the second plate. It is arranged so as to overlap the outside of the shaped member 11. As a result, the cylindrical portion 2 remaining on the shaft portion 7 of the torcia-type high-strength bolt 6 is accommodated inside the bolt insertion hole 12 a of the third plate-like member 12. At this time, the axial direction dimension of the cylindrical portion 2 is such that the inner diameter of the washer 14 fitted from the outside of the third plate-like member 12 to the shaft portion 7 of the Torcia-type high-strength bolt 6 as described later. What is necessary is just to set beforehand so that it may become smaller than the plate | board thickness dimension of this 3rd plate-shaped member 12, when smaller than the outer diameter of this cylindrical part 2. As shown in FIG. On the other hand, when the inner diameter of the washer 14 is larger than the outer diameter of the cylindrical part 2, the axial dimension of the cylindrical part 2 is the thickness of the third plate member 12 and the washer 14. What is necessary is just to set so that it may become smaller than the sum of the thickness dimension.

  After that, after fitting the washer 14 to the shaft portion 7 of the torcia-type high-strength bolt 6, the nut 9 for performing the final tightening is screwed, and the nut 9 is connected to the above-mentioned by using a shear wrench (not shown). Tighten to the shaft 7 of the torcia type high strength bolt 6. As a result, as shown in FIG. 1C, when the pin tail 8 of the torcia type high strength bolt 6 is broken, the nut 9 is finally tightened with a tightening torque corresponding to the breaking torque of the pin tail 8. Will come to be.

  As a result, the three plate-like members 10, 11, and 12 are integrally friction-joined by the axial force that acts in conjunction with the final tightening of the nut 9 with respect to the torcia-type high-strength bolt 6.

  As described above, according to the two-stage joining method for members according to the present invention, the two plate-like members 10 and 11 out of the three plate-like members 10, 11, and 12 are joined in one step in the first-stage joining step. The same high-strength bolt 6 as the high-strength bolt 6 to be used can be used as the high-strength bolt 6 for further friction-joining the third plate-like member 12, so that the three plate-like members arranged in a stacked manner When the members 10, 11, and 12 are all friction-joined, the number of high-strength bolts 6 used is not increased and can be reduced as compared with the conventional method.

  Thereby, the number of bolt insertion holes 10a, 11a, 12a provided in each of the plate-like members 10, 11, 12 can be reduced. In addition to the bolt insertion holes 10a, 11a, and 12a, there is no need to provide an opening for receiving a bolt head or a nut. Accordingly, it is possible to reduce the labor and time required for processing operations such as drilling of the bolt insertion holes 10a, 11a, 12a with respect to the plate-like members 10, 11, 12.

  The member one-stage joining nut 1 can easily perform the operation of tightening the torcia-type high-strength bolt 6 with the tightening torque corresponding to the breaking torque of the breaking portion 5 using the shear wrench. Can do.

  Furthermore, the nut for one-stage joining of the member 1 can easily and accurately manage the tightening torque for the shaft portion 7 of the high strength bolt 6 of the tubular portion 2 by setting the breaking torque of the breaking portion 5. Therefore, the rupture torque of the rupture portion 5 should be set as appropriate so that an axial force corresponding to the desired strength of friction welding during the one-step joining of the first and second plate-like members 10 and 11 can be obtained. That's fine.

  3 (a), 3 (b), and 3 (c) show application examples of a member one-stage joining nut as another embodiment of the present invention.

  That is, the member one-stage joining nut in the present embodiment is the same as the member one-stage joining nut 1 shown in FIGS. 2A and 2B, as indicated by reference numeral 1a in FIGS. In the configuration, the notch 15 extending continuously in the circumferential direction as shown in FIG. 3A or the notch 15 extending intermittently in the circumferential direction as shown in FIG. It is set as the structure which becomes.

  Further, the member single-stage joining nut in the present embodiment has the same configuration as the member single-stage joining nut 1 shown in FIGS. 2A and 2B, as indicated by reference numeral 1a in FIG. It is good also as a structure which provides in the inner peripheral surface of the fracture | rupture part 5 the notch 15 extended continuously or intermittently in the circumferential direction. FIG. 3C shows a case where notches 15 extending continuously in the circumferential direction are provided.

  Other configurations are the same as those shown in FIGS. 2A and 2B, and the same components are denoted by the same reference numerals.

  3A, 3B, and 3C, the member 1-stage joining nut 1a can be broken at the position of the notch 15 when the breaking portion 5 is broken. Can be performed stably. In addition, since the fracture of the fracture portion 5 is stabilized, variation in the fracture torque of the individual member one-stage joining nut 1a can be suppressed.

  Furthermore, even if the thickness t (see FIG. 2A) of the fracture portion 5 is constant, the breaking torque of the fracture portion 5 can be increased by changing the depth of the notch 15 provided in the fracture portion 5. It becomes possible to adjust. For this reason, even if the strength desired for the frictional joining of the plate members 10 and 11 at the first stage (see FIGS. 1A, 1B, and 1C) changes, the member 1-stage joining nut 1a. Therefore, the member single-stage joining nut 1a having different breaking torques of the breaking portion 5 can be easily manufactured without changing the design of changing the thickness of the breaking portion 5.

  In addition, this invention is not limited only to the said embodiment, You may make it perform the frictional joining of the plate-shaped members 10, 11 and 12 with the high strength volt | bolt 6 and the nut 9 other than a torcia type.

  The plate thickness dimensions of the plate-like members 10, 11, and 12 to be joined may be arbitrarily changed or may be non-uniform. The high-strength bolt 6 has a shaft portion 7 longer than the sum of the plate thickness dimensions of the respective plate-like members 10, 11, 12 to be joined and the screwed portion of the nut 9 for final fastening. What is necessary is just to select suitably as needed.

  The tool fitting portion 4 of the member one-stage joining nuts 1, 1 a can be fitted with a tool for applying a rotational force for tightening the female screw 3 of the cylindrical portion 2 to the shaft portion 7 of the high strength bolt 6. If it does in this way, it is good also considering the external shape of this tool fitting part 4 as shapes other than a hexagon according to the form of this tool.

  The size of the outer shape of the tool fitting portion 4 may be set freely. At this time, when the difference between the size of the outer shape of the tool fitting portion 4 and the size of the outer shape of the cylindrical portion 2 is small, the member one-stage joining nut 1 has the tool fitting portion 4 and the cylindrical portion 2. It is good also as a structure which abbreviate | omitted the fracture | rupture part 5 between. In this case, the bolt insertion hole 12a (see FIGS. 1A, 1B, and 1C) of the plate-like member 12 to be joined in the second-stage joining step in the two-stage joining method for members of the present invention is used as the above-mentioned member. What is necessary is just to make it drill with the size which can accept the tool fitting part 4 with the cylindrical part 2 of the nut 1 for one-step joining.

  In the two-stage joining method for members according to the present invention, after a plurality of plate-like members are friction-joined in a first-stage joining process, another plate-like member is further joined in a second-stage joining process. If the number of plate-like members to be joined in the first-stage joining process is three or more, or in the second-stage joining process, a plurality of plate-like members are later You may apply when joining.

  Of course, various modifications can be made without departing from the scope of the present invention.

1, 1a Nuts for one-stage member joining 2 Tubular part 3 Female thread 4 Tool fitting part 5 Breaking part 6 Torcia type high strength bolt (bolt)
7 shaft portion 8 pin tail 9 nut 10 plate-like member 10a bolt insertion hole 11 plate-like member 11a bolt insertion hole 12 plate-like member 12a bolt insertion hole

Claims (5)

A plurality of plate-like members are overlapped, and a member single-stage joining nut is screwed onto a bolt shaft portion that is inserted and arranged in a bolt insertion hole that is drilled in correspondence with each plate-like member, and tightened. , Performing a first stage joining step of joining the plurality of plate-like members in one stage,
Next, a plate-like member in which a bolt insertion hole is formed at a location corresponding to the arrangement of the bolt used in the first-stage joining step is attached to the joined body of the plurality of plate-like members. Overlaying the bolt and the member one-stage joining nut through the insertion hole, and performing the second stage joining process of tightening the nut to the bolt from the outside of the plate-like member overlaid afterwards,
A two-stage joining method for members, characterized in that all laminated plate-like members are frictionally joined by the bolts and nuts.   As a nut for one-stage joining of members, it is provided with a cylindrical part engraved on the inner peripheral surface with a female thread to be screwed into the axial part of the bolt on one end side in the axial direction, and on the other end side in the axial direction A tool fitting portion that allows a tool to be fitted to the outer peripheral portion as an annular shape having an inner diameter larger than the outer diameter of the portion, and a radial thickness between the cylindrical portion and the tool fitting portion. 2. The method for two-stage joining of members according to claim 1, wherein a member is integrally connected via an annular fracture portion smaller than the thickness of any of the tool fitting portion and the cylindrical portion. .   A torcia type high strength bolt is used as a bolt, and the tool fitting part is a hexagonal shape similar to a nut for final fastening to a torcia type high strength bolt as a member one-stage joining nut, and the breaking torque of the breaking part is The member two-stage joining method according to claim 2, wherein a member one-stage joining nut set to be smaller than a breaking torque of a pin tail of a torcia type high strength bolt is used. It has a cylindrical part engraved on the inner peripheral surface with an internal thread to be screwed into the axial part of the bolt on one end side in the axial direction,
Provided with a tool fitting portion that allows the tool to be fitted to the outer peripheral portion as an annular shape having an inner diameter larger than the outer diameter of the shaft portion of the bolt on the other end side in the axial direction,
In addition, the tubular portion and the tool fitting portion are integrally connected via an annular fracture portion whose radial thickness is smaller than any thickness of the tool fitting portion and the tubular portion. A member single-stage joining nut characterized by having the following structure.   The tool fitting part has the same hexagonal shape as the nut that performs final tightening on the Torcia type high-strength bolt, and the breaking part sets the breaking torque of the breaking part to be smaller than the breaking torque of the pintail of the Torcia type high-strength bolt The member single-stage joining nut according to claim 4, which is configured as described above.

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