JP6857897B2 - Plate material with screw holes and its manufacturing method - Google Patents

Description

The present invention relates to a plate material with screw holes, particularly a plate material with screw holes capable of performing a loosening prevention function, and a method for manufacturing the same.

The following structure is known as a structure for fastening a metal plate material, particularly a metal thick plate, with a bolt.
The first is a structure in which a female thread is directly formed on the plate material. Specifically, the through hole is tapped on the plate material, or the through hole and tapping are simultaneously applied to form a female screw.

The second is a structure in which nuts are fixed to the plate material. Specifically, a nut is fixed to a plate material having a through hole by welding or the like.
The third is a structure in which a nut is attached to a plate material using a clip nut. Specifically, it is the structure shown in Patent Document 1, and in this Patent Document 1, a fastening structure that exerts a locking action is realized by using a locking nut provided with a friction ring for the nut. ..
Even with the second structure, if the locking nut is fixed to the plate material, a fastening structure that fulfills the locking action can be realized.

However, in the first structure, it is difficult to realize a fastening structure that has a locking action, and a highly practical structure has not yet been proposed. As shown in Patent Document 2, a locking structure is provided on the bolt. It is only proposed to adopt what is provided.
In addition, when adjusting the distance between the plate material and other members and leveling the other members, the bolt is in contact with the tip of the shaft by adjusting the degree of screwing. The position of the member is adjusted, but when the nut is welded to the plate material as in the past, the distance between the member and the other member can be adjusted to be less than the thickness of the nut. Can not.

Jitsufuku No. 7-40724 Japanese Unexamined Patent Publication No. 2003-120644

INDUSTRIAL APPLICABILITY The present invention aims to realize a fastening structure in which a female screw is directly formed on a plate material to prevent loosening. In particular, it is an object of the present invention to provide a plate material with screw holes that can effectively prevent loosening while maintaining a predetermined plate thickness.
An object of the present invention is to provide a method for producing a plate material with screw holes capable of preventing loosening, and to provide a production method capable of suppressing waste of resources and energy.

The present invention includes a metal plate material and a friction ring fixed to the plate material, and the plate material penetrates from a recess formed from the upper surface to the lower surface side and from the bottom surface of the recess to the lower surface of the plate material. The friction ring is provided with an annular fixing portion fixed to the bottom surface of the recess, and a friction piece protruding inward in the radial direction from the fixing portion, and is provided in the female screw hole. Provided is a plate material with a screw hole configured so that the friction piece engages with a male screw to be screwed to prevent the male screw from loosening.

The bottom surface of the recess may be provided with a caulking protrusion, and the fixing portion of the friction ring may be fixed by the caulking protrusion.
Further, it can be carried out assuming that the caulking protrusion and the friction ring do not protrude from the upper surface of the plate material. As a result, there is nothing protruding from the plate material having a predetermined plate thickness, and it is possible to prevent an obstacle from stacking another object on the upper surface of the plate material or installing it in a narrow place.

Further, since the concave portion communicates with the end surface of the plate material, rainwater or the like can be discharged when used outdoors.
In the production of the threaded plate material, the recess is formed by performing counterbore processing from the upper surface of the flat plate material, and the caulking protrusion in an upright state is carved out during the counterbore processing. Then, the friction ring is arranged on the bottom surface of the recess, and the caulking protrusion in the upright state is bent to fix the fixed portion.

INDUSTRIAL APPLICABILITY The present invention has been able to provide a plate material with a screw hole that realizes a fastening structure in which a female screw is directly formed on a plate material and that has a locking action. In particular, this plate material can exert an effective anti-loosening effect while maintaining a predetermined plate thickness.
Further, the present invention is a method for manufacturing a plate material with screw holes that can perform a locking action, and has been able to provide a manufacturing method that can suppress waste of resources and energy.

(A) is a plan view of a plate material with screw holes according to an embodiment of the present invention, (B) is a semi-cross-sectional view taken along line AA of (A), and (C) is a friction ring of the plate material with screw holes. Plan view of. (A) is a plan view which shows the 1st processing process of the plate material with a screw hole which concerns on embodiment of this invention, (B) is a semi-cross section view along line BB of (A). (A) is a plan view showing a second processing step of the threaded plate material according to the embodiment of the present invention, (B) is a semi-cross-sectional view taken along the line CC of (A), and (C) is (C). It is an enlarged view of the D part of A) and is the cross-sectional view in the state where the friction ring is placed. Explanatory drawing which shows the fastening state with the bolt of the plate material with a screw hole. (A) is a plan view of a plate material with screw holes according to another embodiment of the present invention, and (B) is a semi-cross-sectional view taken along the line EE of (A). The explanatory view of the form which uses this invention when adjusting the space | separation between a plate material and another member.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The plate material with screw holes shown in FIGS. 1 to 4 includes a plate material 11 and a friction ring 31 fixed to the plate material 11.
The plate material 11 is a metal flat plate on which a female screw is directly formed, and a screw hole 23 is formed in a recess 21 formed by counterbore processing from the upper surface 12 to the lower surface 13 side. The screw hole 23 penetrates from the bottom surface 22 of the recess 21 to the lower surface 13 of the plate material 11, and a female screw 24 is formed on the inner peripheral surface thereof. The screw hole 23 is directly formed in the plate material 11 by a well-known processing method such as cutting by drilling and tapping.
The depth of the screw hole 23 may be about 1/2 or more of the nominal diameter of the female screw, and the depth of the recess 21 may be about 1/4 or more of the nominal diameter. These depths can be variously changed depending on the thickness of the plate material 11, the size of the screws, and the like.

A friction ring 31 is attached to the recess 21. The recess 21 is made of a thin metal plate material having elasticity such as spring steel, and includes an annular fixing portion 32 and a friction piece 33 formed inside the annular fixing portion 32 as shown in FIG. 1 (c). .. The fixing portion 32 is preferably an annular shape connected without a break, but may have a cut in a part such as a C shape as long as it can be fixed to the plate material 11 described below. The tip of the friction piece 33 protrudes inside the screw hole 23, and in this embodiment, a pair is formed facing each other, but the friction piece 33 is provided on the condition that an axial force is applied by its elasticity. The specific form can be changed in various ways.

The friction ring 31 engages with the screw 42 of the bolt 41 screwed into the female screw 24, and applies an axial force to the screw 42 by its elasticity to prevent the screw from loosening. It needs to be securely fixed to 11. Therefore, in this embodiment, it is fixed by caulking with the caulking protrusion 25. As the fixing means, other fixing methods such as welding and brazing can be adopted, but considering the influence of heat on the elastic force of the friction ring 31, caulking is more stable in quality. Is preferable.

The caulking protrusion 25 is formed in an annular shape on the bottom surface 22 of the recess 21, and the friction ring 31 is crimped by bending the tip of the caulking protrusion 25 in an upright position with respect to the fixed portion 32 of the friction ring 31. It is something to stop. The caulking protrusion 25 is preferably an annular shape connected without a break, but may have a partial cut as long as the friction ring 31 can be fixed.

More specifically, in this embodiment, a flat mounting surface 26 is formed inside the caulking protrusion 25, and the friction ring 31 is mounted and supported on the mounting surface 26 for caulking. Caulking is stopped by the protrusion 25. As shown in FIG. 3C, the mounting surface 26 is arranged at a position slightly higher than the bottom surface 22 of the recess 21. It is appropriate that the protruding height a of the mounting surface 26 from the bottom surface 22 is about 0.5 to 2 mm, and the caulking die is inserted deeper than the base end of the caulking protrusion 25 due to this step. It is advantageous in that caulking can be reliably performed by the caulking protrusion 25 and strong fixing is realized. It is most preferable that the bottom surface 22 and the mounting surface 26 are parallel to each other and orthogonal to the axial direction of the screw hole 23, but the friction ring 31 may be changed depending on the form and method.

Assuming that the caulking protrusion 25 and the friction ring 31 are entirely contained in the recess 21 and do not protrude from the upper surface of the upper surface 12 of the plate material 11, nothing protrudes from the upper surface of the upper surface 12 of the plate material 11. This is advantageous in that it can prevent obstacles to stacking other objects on the upper surface of the plate material 11 or installing the plate material 11 in a narrow place. At that time, since the tip of the bolt 41 only needs to protrude above the friction ring 31 by about one mountain (one round), nothing including the bolt 41 protrudes (state in FIG. 4). The depth of the recess 21 (the length between the upper surface 12 of the plate material 11 and the bottom surface 22 of the recess 21) can be determined in consideration of the minimum necessary protrusion length of the bolt 41. If the tip of the bolt 41 may protrude, the depth of the recess 21 may be made shallower.

Further, in this embodiment, a part of the recess 21 is opened to the end surface 14 of the plate member 11 as a communication portion 15. As a result, rainwater and the like can be discharged when used outdoors, and dust and the like can be swept out, so that the structure is such that water and dust do not easily collect.

However, as shown in FIG. 5, by providing the recess 21 in the center of the plate material 11, it is possible to carry out the process without providing the communication portion 15.

The plate material with screw holes according to the present invention can be manufactured by various methods, and an example thereof will be described with reference to FIGS. 2 and 3.
As shown in FIG. 2, a flat metal plate material having a predetermined shape to be a plate material 11 is prepared, and a screw hole 23 and a female screw 24 are formed from the upper surface 12 or the lower surface 13 by drilling and tapping. At that time, only the length of the screw hole 23 and the female screw 24 in the completed state can be formed, but the screw hole 23 and the female screw 24 may be formed over the entire thickness of the plate material 11.

Next, as shown in FIG. 3, counterbore processing is performed on the outside of the screw hole 23 from the upper surface 12 to form the recess 21. At that time, the inside of the caulking protrusion 25 is cut into a columnar shape, and the outside is cut into a donut shape to cut out the caulking protrusion 25 in an upright state. At that time, the peripheral surface formed by cutting may be slightly inclined so that the cross section of the caulking protrusion 25 is tapered. Further, by cutting the inside of the caulking protrusion 25 slightly shallower than the outside, the above-mentioned step can be provided between the mounting surface 26 and the bottom surface 22.

A friction ring 31 is placed on the mounting surface 26 (see FIG. 3C), and the caulking protrusion 25 is bent to be plastically deformed so as to cover the fixed portion 32 of the friction ring 31. By pressing and crimping the friction ring 31, the fixed portion 32 of the friction ring 31 is fixed by the female screw 24, and the completed state of FIG. 1 is obtained.

As another method, it is possible to leave only the caulking protrusion 25 by cutting the entire surface of the upper surface 12, but this method reduces the strength of the plate material 11 and wastes a lot of resources and energy. On the other hand, in the above-mentioned method, such waste can be suppressed.

The form of the plate material 11 can be variously changed and implemented, and can be applied to the case where the plate material 11 and another member 43 are fastened without using a nut. Conventionally, a clip nut as shown in Patent Document 2 was used or the nut was welded to a plate material, but in any case, the nut protruded from the plate surface. On the other hand, in the example of FIG. 4, the female screw 24 can be fastened with the bolt 41 without protruding from the plate surface, and the friction ring 31 can prevent the screw from loosening. In addition, this structure includes a structure for joining two independent plates, a structure for joining pipes by joining flanges provided at the ends of pipes, and mounting of various holding plates, brackets, machines, and devices. It can be applied to various structures such as a fixed structure such as a plate.

FIG. 6 shows an example used when adjusting the distance between the other member 43 and the plate member 11 to perform leveling of the other member 43. In this example, when the other upper member 43 is arranged with respect to the lower plate member 11, the bolt 41 is in contact with the tip of the shaft portion by adjusting the degree of screwing into the female screw 24. The position of the member 43 of the above is adjusted. When the nut is welded to the plate material 11 as in the conventional case, the distance between the plate material 11 and the other member 43 cannot be adjusted to be less than the thickness of the nut. Since there is nothing protruding from the upper surface of the plate material 11 and only the bolt 41 protrudes, the distance between the plate material 11 and the other member 43 can be adjusted to 0 mm, and the friction ring 31 is used. It can prevent loosening. In the figure, the plate member 11 and the other members 43 are arranged side by side in the vertical direction, but they should not be understood by limiting them to the directions shown in the example of the figure, such as arranging them side by side. The plate member 11 and the other member 43 may be a single member as long as they exhibit the functions of the present invention, or may form a part of the parts, and the entire plate-like member may be formed. It should not be limited to things and understood.

11 Plate 12 Top surface 13 Bottom surface 14 End surface 15 Communication part 21 Recession 22 Bottom surface 23 Screw hole 24 Female screw 25 Caulking protrusion 26 Mounting surface 31 Friction ring 32 Fixed part 33 Friction piece 41 Bolt 42 Male screw 43 Other members

Claims (5)

A metal plate material and a friction ring fixed to the plate material are provided.
The plate material includes a recess formed from the upper surface to the lower surface side, and a screw hole for penetrating from the bottom surface of the recess to the lower surface of the plate material.
The friction ring includes an annular fixing portion fixed to the bottom surface of the recess and a friction piece protruding inward in the radial direction from the fixing portion.
A plate material with a screw hole, which is configured so that the male screw is prevented from loosening by engaging the friction piece with the male screw screwed into the female screw hole. The plate material with screw holes according to claim 1, wherein the bottom surface of the recess is provided with a crimping protrusion, and the fixing portion of the friction ring is fixed by the crimping protrusion. The caulking protrusion and the friction ring do not protrude from the upper surface of the plate material.
A mounting surface for supporting the fixed portion of the caulking protrusion from below is provided inside the annular caulking protrusion, and the previously described mounting surface is located above the bottom surface of the recess. The plate material with screw holes according to claim 2. The plate material with screw holes according to claim 2 or 3, wherein the concave portion communicates with the end surface of the plate material. In the method for manufacturing a plate material with screw holes according to any one of claims 2 to 4.
The recess is formed by performing counterbore processing from the upper surface of the flat plate-shaped plate material, and the caulking protrusion in an upright state is carved out during the counterbore processing.
A method for manufacturing a plate material with screw holes, which comprises arranging the friction ring on the bottom surface of the recess and fixing the fixing portion by bending the caulking protrusion in an upright state.

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