JP2007160372A - Method for joining machine element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To firmly join a machine element with an objective member. <P>SOLUTION: A pedestal 3 which projects a bolt 1 from the one end part and forms a projection 4 at the other end part, is disposed so as to be faced to the front surface of the objective member 2, on which the bolt 1 is to fit with the forming end of the projection 4, A tool body 7 is pushed against the back surface of the objective member 2 while rotating the tool body and the projection 4 in the pedestal 3 is sunk into the objective member 2 softened with the friction heat and the pedestal 3 is diffused and joined onto the surface of the objective member 2. Further, the tool body 7 is drawn out from the objective member 2 and a plastic deforming portion in the objective member 2 sunk-into with the projection 4, is hardened. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a machine element joining method assuming bolts, nads, and the like.

  Friction stir welding is a technique for joining members to be joined together without melting them (see, for example, Patent Document 1).

  In this technique, a welding tool is pressed against a workpiece to which the members to be joined are stacked while being rotated, and the material softened by frictional heat and plastic flow is stirred and assimilated.

Next, the part to which the material is assimilated is cured by separating the joining tool from the object to be joined, and the members to be joined are joined to each other.
JP 2004-136365 A

  However, in Patent Document 1, there is no proposal for joining members of different materials, and it is not possible to join a mechanical element such as a bolt or nut made of carbon steel to a target member made of aluminum alloy.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to enable a mechanical element to be firmly joined to a target member.

  In order to achieve the above object, according to the present invention, a pedestal in which a machine element protrudes from one end and a protrusion is formed at the other end so as not to be coaxial with the machine element is provided. Place it so as to face the surface, then press the part that overlaps the protrusion on the back surface of the target member while rotating the welding tool, squeeze the protrusion on the base into the target member softened by frictional heat, The joining tool is pulled away from the target member, and the plastic deformation portion of the target member is cured.

  Alternatively, a pedestal in which a plurality of machine elements protrude from one surface and a protrusion is formed for each machine element on the other surface is disposed so that the protrusion forming surface faces the surface of the target member to which the machine element is to be attached, Next, while rotating the welding tool, it is pressed against the portion overlapping the protrusion on the back surface of the target member, the protrusion of the base is pushed into the target member softened by frictional heat, and then the welding tool is pulled away from the target member, The plastic deformation portion of the target member is cured.

  In other words, the machine element protruding from the pedestal is joined to the target member by intermolecular joining of the material of the target member softened by frictional heat and the pedestal material closely attached to it, and the fitting of the projection formed on the target member and the pedestal. To do.

  Further, a pedestal in which a mechanical element protrudes from one end and a recess is formed at the other end so as not to be coaxial with the mechanical element is disposed so that the indented end faces the surface of the target member to which the mechanical element is to be attached, Next, while rotating the welding tool, it is pressed against the part overlapping the recess on the back surface of the target member, the target member softened by frictional heat is sunk into the recess of the pedestal, and then the welding tool is pulled away from the target member, The plastic deformation portion of the target member is cured.

  Alternatively, a pedestal in which a plurality of machine elements protrude from one surface and a depression is formed for each machine element on the other surface is disposed so that the depression forming surface faces the surface of a target member to which the machine element is to be attached, Next, while rotating the welding tool, it is pressed against the part overlapping the recess on the back surface of the target member, the target member softened by frictional heat is sunk into the recess of the pedestal, and then the welding tool is pulled away from the target member, The plastic deformation portion of the target member is cured.

  In other words, the machine element protruding from the pedestal is joined to the target member by intermolecular joining of the material of the target member softened by frictional heat and the pedestal material closely attached to it, and by fitting the recess formed in the target member and the pedestal. To do.

  Furthermore, the adhesion between the target member and the pedestal is enhanced by pressing a joining tool having a tip end surface larger than the planar shape of the pedestal against the back surface of the target member.

  According to the mechanical element joining method of the present invention, the following excellent effects can be obtained.

  (1) Since the protrusion formed on the pedestal is inserted into the surface of the target member softened by the rotation and pressing of the welding tool, the intermolecular bonding between the target member and the pedestal and the fitting of the target member and the protrusion are combined. Due to the effect, the machine element can be joined to the target member together with the base with high torque strength.

  (2) Since the surface of the target member softened by the rotation and pressing of the joining tool is embedded in the recess formed in the pedestal, the intermolecular connection between the target member and the pedestal and the fit of the target member and the recess are combined. Due to the effect, the machine element can be joined to the target member together with the base with high torque strength.

  (3) If a joining tool having a tip surface larger than the planar shape of the pedestal is used, the adhesion between the target member and the pedestal is increased, and intermolecular joining is more reliable.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a first example of a machine element joining method according to the present invention. A target member 2 to which a bolt 1 is to be attached is a panel made of an aluminum alloy.

  The bolt 1 protrudes from one end of a flat pedestal 3, which is an integral part made of carbon steel, and a plurality of protrusions 4 are not positioned coaxially with respect to the bolt 1 at the other end of the pedestal 3. It is shaped like this.

  In addition, a backing member 6 having a storage hole 5 into which the bolt 1 enters downward, and a cylindrical tool body 7 for plastically deforming the target member 2 are prepared as tools.

  The backing member 6 is provided with a stopper 8 for restraining the rotation of the pedestal 3 around the bolt 1, and the tool body 7 is made of a cemented carbide having wear resistance and high hardness. It is said.

  The tip surface 7 a of the tool body 7 is formed to be slightly larger than the planar shape of the base 3.

  When joining the bolt 1 to the target member 2, as shown in FIG. 1A, one end of the pedestal 3 is placed on the backing member 6 so that the bolt 1 enters the accommodation hole 5 and faces the protrusion 4. The surface of the target member 2 is placed on the other end of the base 3.

  Next, as shown in FIG. 1 (b), while rotating the tool body 7 from above, the object member 2 is pressed against the back surface of the place where it overlaps the pedestal 3, and this area is softened by frictional heat. The tool main body 7 is recessed on the back side, the protrusion 4 of the pedestal 3 is recessed on the surface side of the target member 2, and further, the surface of the target member 2 is placed on the pedestal as shown in FIG. 3 is brought into close contact with the other end.

  Thereby, intermolecular bonding occurs between the aluminum alloy and the carbon steel, and the base 3 integrated with the bolt 1 is bonded to the surface of the target member 2.

  In order to solidify the reciprocity between the target member 2 and the pedestal 3, it is desirable to use a tool body 7 having a tip surface 7 a larger than the planar shape of the pedestal 3.

  Thereafter, as shown in FIG. 1 (d), the tool body 7 is pulled away from the target member 2, and the plastic deformation portion of the target member 2 is cured.

  When the outer diameter d of the tool body 7 is 20 mm, the thickness t of the target member 2 is 6 mm, and the nominal diameter of the bolt 1 is M8, the torque strength of the bolt 1 and the base 3 and the target member 2 is 50 N · m was exceeded by the synergistic effect of the intermolecular bonding and the fitting of the protrusion 4 and the target member 2.

  Further, in consideration of torque strength, it is desirable that the number of the protrusions 4 is more than one.

  FIG. 2 shows a second example of the mechanical element joining method according to the present invention. In the figure, the same reference numerals as those in FIG. 1 denote the same parts.

  The bolt 1 protrudes from one end of a flat pedestal 9, which is an integral part made of carbon steel. At the other end of the pedestal 9, a plurality of recesses 10 are not positioned coaxially with the bolt 1. It is shaped like this.

  When the bolt 1 is joined to the target member 2, one end of the base 9 is placed on the backing member 6 so that the bolt 1 enters the accommodation hole 5, and the surface of the target member 2 is placed on the base 9 so as to face the recess 10. The tool body 7 is placed on the other end and pressed against the back surface of the portion where the target member 2 overlaps the pedestal 9 while rotating the tool body 7 from above, and this area is softened by frictional heat. Let me rub you in

  Further, the material derived from the target member 2 is sunk into the recess 10 of the base 9, and the surface of the target member 2 is brought into close contact with the other end of the base 9.

  As a result, intermolecular bonding occurs between the aluminum alloy and the carbon steel, and the base 9 integrated with the bolt 1 is bonded to the surface of the target member 2.

  Thereafter, the tool body 7 is pulled away from the target member 2 and the plastic deformation portion of the target member 2 is cured.

  FIG. 3 shows a third example of the mechanical element joining method according to the present invention. In the figure, the portions denoted by the same reference numerals as those in FIG. 1 represent the same items.

  In this example, a plurality of bolts 1 protrude from one surface of an elongated pedestal 11, which are integral parts made of carbon steel, and a plurality of protrusions 4 are provided on the other surface of the pedestal 11. It is shaped so that it is located near.

  In addition, a backing member 12 having a storage hole 5 into which the bolt 1 enters downward, and a tool body 7 are prepared as tools.

  A predetermined range of one surface of the pedestal 11 is placed on the backing member 12 so that the predetermined bolt 1 enters the storage hole 5, and the surface of the target member 2 is placed over the other surface of the pedestal 11.

  Next, the tool body 7 is rotated from above the backing member 12 and pressed against a portion corresponding to the protrusion 4 on the back surface of the target member 2, and the vicinity thereof is agitated and softened by frictional heat and plastic flow. The tool body 7 is fitted into the back surface side, and the protrusion 4 of the pedestal 11 is fitted into the surface side of the target member 2 so that the surface of the target member 2 is in close contact with the other surface of the pedestal 11.

  Thereafter, the tool body 7 is pulled away from the target member 2 and the plastic deformation portion of the target member 2 is cured.

  When the steps as described above are repeated, the base 11 integrated with the plurality of bolts 1 is joined to the surface of the target member 2.

  FIG. 4 shows a fourth example of the mechanical element joining method according to the present invention. In the figure, the parts denoted by the same reference numerals as those in FIG.

  In this example, a plurality of bolts 1 protrude from one surface of an elongated pedestal 13, which are integral parts made of carbon steel, and a plurality of recesses 10 are formed on the other surface of the pedestal 13. It is shaped so that it is located near.

  When joining the pedestal 13 to the target member 2, the predetermined range of one surface of the pedestal 13 is placed on the backing member 12 so that the predetermined bolt 1 enters the storage hole 5, and is placed on the other surface of the pedestal 13. The target member 2 is placed.

  Next, the tool body 7 is rotated from above the backing member 12 and pressed against a portion corresponding to the recess 10 on the back surface of the target member 2, and the vicinity thereof is agitated and softened by frictional heat and plastic flow. The tool main body 7 is sunk into the back surface side, and the material derived from the target member 2 is sunk into the recess 10 of the pedestal 13 so that the surface of the target member 2 is in close contact with the other surface of the pedestal 13.

  Thereafter, the tool body 7 is pulled away from the target member 2 and the plastic deformation portion of the target member 2 is cured.

  When the steps as described above are repeated, the base 13 integrated with the plurality of bolts 1 is joined to the surface of the target member 2.

  Note that the mechanical element joining method of the present invention is not limited to the above-described embodiment, and a nut, a pin, or the like is attached to the base as a mechanical element, or otherwise departs from the gist of the present invention. It goes without saying that changes can be made within the range not to be performed.

  The mechanical element joining method of the present invention can be applied to various parts assembling processes.

It is a conceptual diagram which shows the construction procedure of the 1st example of the machine element joining method of this invention. It is a conceptual diagram which shows the construction completion state of the 2nd example of the machine element joining method of this invention. It is a conceptual diagram which shows the construction in-progress state of the 3rd example of the machine element joining method of this invention. It is a conceptual diagram which shows the construction-in-progress state of the 4th example of the machine element joining method of this invention.

Explanation of symbols

1 bolt (machine element)
2 Target member 3 Base 4 Protrusion 7 Tool body (joining tool)
9 Pedestal 10 Dimple 11 Pedestal 13 Pedestal

Claims (5)

  A pedestal having a protrusion protruding from one end and a protrusion formed at the other end that is not coaxial with the mechanical element is positioned so that the protruding end faces the surface of the target member to which the mechanical element is to be attached; While rotating the welding tool, press it against the part that overlaps the protrusion on the back of the target member, squeeze the protrusion on the base into the target member softened by frictional heat, and then pull the welding tool away from the target member. A mechanical element joining method comprising curing a plastic deformation portion of a member.   A pedestal having a plurality of machine elements projecting from one surface and a projection formed for each machine element on the other surface is disposed so that the projection forming surface faces the surface of the target member to which the machine element is to be attached, While rotating the welding tool, press it against the part that overlaps the protrusion on the back of the target member, squeeze the protrusion on the base into the target member softened by frictional heat, and then pull the welding tool away from the target member. A mechanical element joining method comprising curing a plastic deformation portion of a member.   A pedestal having a recess projecting from one end and shaped at the other end so as not to be coaxial with the machine element is positioned such that the recess forming end faces the surface of the target member to which the machine element is to be mounted; While rotating the welding tool, press it against the part that overlaps the recess on the back side of the target member, squeeze the target member softened by frictional heat into the recess in the pedestal, and then pull the welding tool away from the target member. A mechanical element joining method comprising curing a plastic deformation portion of a member.   A pedestal having a plurality of machine elements projecting from one surface and having depressions formed on the other surface for each machine element is disposed so that the depression forming surface faces the surface of the target member to which the machine elements are to be attached, and While rotating the welding tool, press it against the part that overlaps the recess on the back side of the target member, squeeze the target member softened by frictional heat into the recess in the pedestal, and then pull the welding tool away from the target member. A mechanical element joining method comprising curing a plastic deformation portion of a member.   The machine element joining method according to claim 1 or 3, wherein a joining tool having a tip end surface larger than a planar shape of the pedestal is pressed against the back surface of the target member.

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