JP6840433B2 - Temporary tightening method and temporary tightening clip for plates with different coefficients of thermal expansion - Google Patents

Description

The present invention relates to a temporary tightening method and a temporary tightening clip for plate materials having different coefficients of thermal expansion such as a steel plate and an aluminum plate.

For example, in the manufacturing process of an automobile door, the door panel is painted with both ends of the reinforcing beam temporarily tightened with bolts, and then heat-dried. Specifically, a welding nut is welded to the reinforcing beam, and the door panel is heated and dried with the door panel bolted to the welding nut. Since the conventional door panel is made of steel plate and the reinforcing beam is also made of steel plate, there is almost no difference in the coefficient of thermal expansion, and no particular problem has occurred in the heating and drying process.

However, as shown in Patent Document 1, in recent years, a door panel made of a metal such as aluminum may be adopted for the purpose of weight reduction. In this case as well, since a high-strength steel plate is usually used as the reinforcing beam, the aluminum plate having a large coefficient of thermal expansion expands more than the reinforcing beam in the heating and drying process, and is distorted at the temporarily tightened portion. May cause deformation of the aluminum plate.

JP-A-2007-326532

Therefore, an object of the present invention is to solve the conventional problems described above, the temporary tightening of the different plate material thermal expansion coefficient, such as steel and aluminum plates, may also be temporarily tightened without deforming the heat drying process It is to provide the method and the temporary tightening clip used for it.

In the temporary tightening method of the plate materials having different coefficients of thermal expansion of the present invention, which has been made to solve the above problems, the nut is fixed to one of the two plates having different coefficients of thermal expansion and penetrates through the other plate material. It is characterized by absorbing the difference in thermal expansion of the two plate materials in the heating process by forming holes and supporting the other plate material so as to be movable in the surface direction by a temporary tightening clip elastically inserted into the nut. Is to be.

Further, the temporary tightening clip of the present invention is a temporary tightening clip used in the above-mentioned temporary tightening method for plate materials having different coefficients of thermal expansion, and the lower portion of a shaft portion having a flange at the center is fixed to one plate material. It is characterized by forming an elastic insertion part into the nut, forming a tapered head at the upper end of the shaft part, and forming an elastic claw that presses the surface of the other plate material below the head. is there.

The other temporary tightening clip of the present invention is a temporary tightening clip used in the above-mentioned temporary tightening method for plate materials having different thermal expansion rates, and is a nut fixed to one of the plate materials at the lower part of the flange-shaped head. An elastic insertion portion into the flange and a tongue piece to be inserted into a long hole formed in the other plate material are formed, and a projecting piece for rotating a temporary tightening clip and an elastic piece are provided on the upper portion of the flange-shaped head. An operation piece for retracting the insertion portion inward is projected, and the tongue piece is formed on the front side of the operation piece at a position above the elastic insertion portion. is there.

According to the temporary tightening method of the present invention and the temporary tightening clip of the present invention, the difference in thermal expansion generated when heating plates having different coefficients of thermal expansion can be absorbed by moving the other plate in the plane direction. It can be done and deformation can be prevented.

It is explanatory drawing which shows the temporary tightening state of a plate material. It is an external view which shows the temporary tightening clip of 1st Embodiment. It is a central vertical sectional view which shows the temporary tightening clip of 1st Embodiment. It is an external perspective view which shows the temporary tightening clip of 1st Embodiment. It is explanatory drawing of the state which attached the temporary tightening clip of 1st Embodiment to one plate material. It is sectional drawing which shows the state which two plate materials were temporarily tightened by the temporary tightening clip of 1st Embodiment. It is a four-sided view which shows the temporary tightening clip of the 2nd Embodiment. It is a central vertical sectional view which shows the temporary tightening clip of 2nd Embodiment. It is an external perspective view which shows the temporary tightening clip of 2nd Embodiment. It is explanatory drawing of the state which attached the temporary tightening clip of 2nd Embodiment to the other plate material. It is sectional drawing which shows the state which two plate materials were temporarily tightened by the temporary tightening clip of the 2nd Embodiment.

An embodiment of the present invention will be described below.

As shown in FIG. 1, the present invention is used for temporarily tightening two plate materials having different coefficients of thermal expansion, where 1 is one plate material and 2 is the other plate material. In this embodiment, one plate 1 is a steel plate reinforcing beam bracket, and the other plate 2 is an aluminum door panel. Through holes 3 and 4 are formed in advance at the temporarily tightened portion, and a nut 5 is welded to the back surface of the through hole 3 of one plate material 1.

(First Embodiment)
FIG. 2 is an external view showing a temporary tightening clip of the first embodiment. FIG. 3 is a central vertical sectional view thereof, and FIG. 4 is an external perspective view. This temporary tightening clip is an integrally molded product of resin, reference numeral 10 denotes a shaft portion having a flange 11 in the central portion, and the lower portion of the shaft portion 10 is fixed to one plate member 1 as shown in FIG. An elastic insertion portion 12 is formed in the nut 5.

The elastic insertion portion 12 has a plurality of screw-shaped ribs 13 formed on the outer peripheral side surface of the cylinder, and a slit 14 in the axial direction is formed in the center to give elasticity in the radial direction. The thread of the male threaded rib 13 has a triangular cross section, and can be pushed into the nut 5 to be fixed.

A tapered head 15 is formed at the upper end of the shaft portion 10. The head 15 is provided with a hexagonal portion, and a pair of elastic claws 16 for pressing the surface of the other plate member 2 are formed below the hexagonal portion. The elastic claw 16 extends toward the flange 11, and its tip extends to substantially the same height as the upper surface of the flange 11. The elastic claws 16 do not necessarily have to be paired, and may be three or more.

The temporary tightening clip of the first embodiment configured in this way first pushes the elastic insertion portion 12 into the nut 5 on the back surface through the through hole 3 of one plate member 1 as shown in FIG. At this time, the elastic insertion portion 12 is elastically deformed, and the female screw of the nut 5 and the male screw-shaped rib 13 are elastically meshed with each other. Further, the pushing depth is determined by the lower surface of the flange 11 coming into contact with the upper surface of one of the plate members 1.

In this way, the shaft portion 10 is fixed vertically to one plate member 1, the through hole 4 of the other member 2 is made to coincide with the tapered head 15, and the other member 2 is flanged as shown in FIG. Push in the direction of 11. Since the tip of the head 15 is tapered, the other member 2 can be attached without causing misalignment. At this time, the elastic claw 16 is elastically deformed inward, and when the other member 2 is completely pushed in, it expands outward as shown in FIG. 6 and presses the upper surface of the other member 2 with its tip.

Therefore, the other member 2 is prevented from coming off upward, and the one plate member 1 and the other member 2 are temporarily tightened. Further, since the other member 2 is only pressed by the elastic claw 16, if the through hole 4 is made large, the other plate member 2 is supported so as to be movable in the surface direction thereof.

In this way, even if the heat is heated in the heating and drying step and a difference in the amount of thermal expansion occurs, the relative movement between the one plate material 1 and the other member 2 becomes possible, and the conventional deformation does not occur. .. Moreover, the temporary tightening clip can be easily attached with one touch. After the drying step is completed, the temporary tightening clip can be easily removed from the nut 5 by engaging the tool with the hexagonal portion of the head 15 and rotating it, and then the main fastening with bolts and nuts is performed.

(Second Embodiment)
7 is a four-view view showing the temporary tightening clip of the second embodiment, FIG. 8 is a central vertical sectional view thereof, and FIG. 9 is an external perspective view. This temporary tightening clip is also an integrally molded product of resin. Reference numeral 20 denotes a flange-shaped head, and an elastic insertion portion 21 into the nut 5 fixed to one of the plate members 2 is formed below the flange-shaped head. One side of the flange-shaped head 20 is an opening 22.

As shown in the figure, the flange-shaped head 20 has a main body portion 24 having a diameter smaller than that of the upper large diameter portion 23 formed below the upper large diameter portion 23. The elastic insertion portion 21 has a smaller diameter than the main body portion 24 and is formed below the main body portion 24.

The elastic insertion portion 21 has a bottomed cylindrical shape, and as shown in FIG. 7, a screw-shaped rib 25 is formed on the outer peripheral side surface thereof, and slits 26 in the axial direction are formed on the left and right to give elasticity in the radial direction. It is a thing.

As described above, the central portion sandwiched between the left and right slits 26 of the elastic insertion portion 21 extends upward through the opening 22 of the flange-shaped head 20. An operation piece 27 for elastically retracting the elastic insertion portion 21 inward is formed at the upper end thereof. A tongue piece 28 is formed on the front surface side of the operation piece 27. A reinforcing rib 29 is formed on the upper side of the tongue piece 28.

In addition, a pair of projecting pieces 30 for rotating the temporary tightening clip are provided on the upper portion of the flange-shaped head 20. Further, a thin protrusion 31 is formed on the lower side of the flange-shaped head 20 as shown in FIGS. 7 and 9.

In the temporary tightening clip of the second embodiment configured in this way, first, as shown in FIG. 10, the elastic insertion portion 21 is inserted into the through hole 32 of the other plate material 2, and the tongue piece 28 is inserted into the through hole 32. Position it. The through hole 32 of the other plate material 2 is an elongated hole extending in the direction of the tongue piece 28. When the pair of projecting pieces 30 are operated by fingertips to rotate from this state, the tongue piece 28 engages with the inner surface of the through hole 32 as shown in FIG. 10, and the temporary tightening clip is attached to the other plate material 2. .. At this time, the lower surface of the other plate member 2 is in contact with the upper surface of the thin protrusion 31. The upper surface of the other plate member 2 abuts on the lower surface of the upper large diameter portion 23 of the flange-shaped head 20.

After that, as shown in FIG. 11, the elastic insertion portion 21 protruding from the back surface of the other plate material 2 is inserted into the through hole 3 of the one member 1, and the screw-shaped rib 25 of the elastic insertion portion 21 is inserted into one plate material. It elastically meshes with the female screw of the nut 5 on the back surface of 1. At this time, the upper surface of one plate member 1 comes into contact with the lower surface of the thin protrusion 31, and the one member 1 and the other plate member 2 are temporarily tightened. However, since the other plate material 2 is sandwiched between the lower surface of the upper large-diameter portion 23 and the thin protrusion 31 and can move in the plate surface direction, it is heated in the heating and drying step and a difference in the amount of thermal expansion occurs. However, the relative movement between one plate member 1 and the other member 2 is possible, and the conventional deformation does not occur.

After the drying step is completed, if the operation piece 27 is pushed with a fingertip to bend the elastic insertion portion 21 inward, the temporary tightening clip can be easily removed from the nut 5 with one touch. As described above, the temporary tightening clip of the second embodiment is also easy to attach and detach. After removing the temporary tightening clip, the final fastening is performed with bolts and nuts.

As described above, according to the present invention, the difference in thermal expansion generated when heating plates having different coefficients of thermal expansion can be absorbed by moving the other plate in the plane direction in the temporarily tightened state. Deformation can be prevented. Moreover, there is an advantage that the temporary tightening clip can be attached and detached with one touch.

1 One plate 2 Other plate 3 Through hole 4 Through hole 5 Nut 10 Shaft 11 Flange 12 Elastic insertion part 13 Male thread rib 14 Slit 15 Tapered head 16 Elastic claw 20 Flange-like head 21 Elastic insertion part 22 Opening 23 Upper large diameter 24 Main body 25 Male threaded rib 26 Slit 27 Operation piece 28 Tongue piece 29 Reinforcing rib 30 Projection piece 31 Thin protrusion

Claims (3)

Of the two plates with different coefficients of thermal expansion, a nut is fixed to one plate, a through hole is formed in the other plate, and the other plate is attached to the surface direction by a temporary tightening clip elastically inserted into the nut. A method for temporarily tightening plates having different coefficients of thermal expansion, which comprises absorbing the difference in thermal expansion between two plate materials in a heating step by supporting them so as to be movable. A temporary tightening clip used in the temporary tightening method for plate materials having different coefficients of thermal expansion according to claim 1, wherein the lower part of a shaft portion having a flange at the center is elastic to a nut fixed to one plate material. A temporary tightening clip that serves as an insertion portion and has a tapered head formed at the upper end of the shaft portion and an elastic claw that presses the surface of the other plate material below the head. A temporary tightening clip used in the temporary tightening method for plate materials having different thermal expansion rates according to claim 1, wherein an elastic insertion portion into a nut fixed to one plate material is provided at the lower part of a flange-shaped head. A tongue piece to be inserted into a long hole formed in the other plate material is formed, and a projecting piece for rotating a temporary tightening clip and an elastic insertion part are retracted inward on the upper part of the flange-shaped head. A temporary tightening clip, characterized in that the tongue piece is formed on the front side of the operation piece at a position above the elastic insertion portion.

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