JP2008175379A - Caulking nut and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide simple and easy disassembling and reuse of a caulking nut, and to easily manufacture it from one round-bar material by press forming. <P>SOLUTION: The caulking nut is composed of: a main nut body 2 having a mouth part 2c with an uneven shaped outer circumference, formed on an upper end of a cylinder body 2a with a uniform outer diameter and having a thin inner hole 2b that can be caulked, and a female screw part 2d with a smaller diameter than an inner diameter of the mouth part 2c, formed in a lower end of the cylinder body 2a; and a washer body 3 having a deformed fitting hole 3a capable of fitting in the mouth part 2c of the main nut body 2 in a center part; and a hexagon shape having a detent function on an outer circumference. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

    According to the present invention, a nut is caulked and fixed to a plate body by fitting it into a mounting hole of a plate body having a predetermined thickness and press-fitting and forming a bulging portion by screwing with a caulking tool. The present invention relates to a caulking nut that is screwed to attach a necessary object and a manufacturing method thereof.

  Conventionally, this type of caulking nut has a bowl-shaped head formed integrally with a cylindrical body having a uniform outer diameter, and a female screw having a smaller diameter than the inner hole is formed in the lower half of the inner hole of the cylindrical body. It is made with the structure.

  During use, the caulking nut is fitted into the mounting hole of the plate body and tightened with a caulking tool, and the portion between the caulking head of the caulking nut and the female screw is deformed radially outward by compression to bulge out. By forming the plate, the plate body is sandwiched between the bowl-shaped head and the bulging portion and fixed by caulking.

  Japanese Patent Publication No.62-42168

  However, according to the above-described caulking nut, once the nut is fixed by caulking, it cannot be disassembled again and removed, so that there is a problem that it cannot be performed at a place where disassembly is necessary and cannot be reused.

  Accordingly, an object of the present invention is to provide a caulking nut that can be easily and easily disassembled and reused, and can be easily manufactured from one round bar-like material by forging, and a method for manufacturing the same.

  In order to solve the above-mentioned problem, the invention according to claim 1 of the present application is such that a mouth having an outer shape is formed at the upper end of a cylindrical body having a thin-walled inner hole having a uniform outer diameter and caulking, And a main nut body in which a female thread portion having a diameter smaller than the inner diameter of the mouth portion is formed in the lower end portion of the cylindrical body, and an irregularly shaped fitting hole that can be fitted to the mouth portion of the main nut body in the center portion. And a washer having an irregular shape having a function of preventing rotation of the outer periphery.

  In the invention according to claim 2 of the present application, as a method of manufacturing a caulking nut, first, forming one end of a solid rod-shaped material having a circular cross section to form an odd-shaped head and a cylindrical portion The body is then molded, and then the head is punched out in accordance with the outer peripheral shape of the cylindrical portion of the molded body to form a washer element body and a cylindrical body having a different shape with a detent function and having a circular hole at the center. After that, the washer body is compressed in the center direction to form a washer body with an irregularly shaped fitting hole that fits into the upper end of the cylindrical body at the center, while forging and drawing the cylindrical body. It has a thin inner hole that can be crimped to the intermediate part by processing, and has a small diameter hole part smaller in diameter than the inner hole in the lower end part, and an irregular shape that can fit the fitting hole of the washer body in the upper end part A cylindrical body having a mouth portion is formed, and then, the inner diameter of the cylindrical body is smaller than that of the inner hole. A screw part is formed, a mouth part having an outer periphery is formed at the upper end of the cylindrical body having a uniform outer diameter and a thin inner hole that can be caulked, and the inside of the lower end part of the cylinder body is larger than the inner diameter of the mouth part. A main nut body in which a small-diameter female screw portion is formed is formed.

  According to the caulking nut of the present invention, a mouth portion having an irregular outer periphery is formed at the upper end of a cylindrical body having a thin-walled inner hole having a uniform outer diameter, and the inner diameter of the mouth portion is formed in the lower end portion of the cylindrical body. An unusual shape with a main nut body with a smaller diameter female screw part and an irregularly shaped fitting hole that can be fitted into the mouth of the main nut body at the center, and a function to prevent the outer periphery from rotating Since the fitting hole of the washer body is fitted to the outer periphery of the mouth portion of the main nut body, and the main nut body is overlapped from the lower end side in this state, each mounting hole of the plate body , And by tightening the fastening bolt into the main nut body using a caulking tool, the thin inner hole between the washer body and the female screw is deformed radially outward by compression to form a bulge portion, Thereby, both plate bodies can be fixed by caulking between the washer body and the female screw. In addition, when not in use, the main nut body can be removed from the plate body by loosening and removing the fastening bolt from the main nut body, and then pulling out the washer body from the main nut body and removing it. Thereby, the caulking nut and the plate body can be easily disassembled and reused. In particular, when an expensive titanium, stainless steel, or copper caulking nut is used, or when an expensive plate material is used, a remarkable economic effect can be obtained.

  Further, if the caulking nut is manufactured by the above-described manufacturing method, the caulking nut composed of the main nut body and the washer body can be forged by forging without waste of material from one round bar-shaped member, It is easy to manufacture and can be provided at low cost.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a caulking nut according to the present invention. The caulking nut 1 includes a main nut body 2 and a washer body 3. The main nut body 2 is formed of a cylindrical body 2a having a uniform outer diameter, has a thin inner hole 2b that can be caulked at an intermediate portion thereof, has an irregularly shaped mouth portion 2c with an outer periphery formed at the upper end, and is cylindrical. A female screw portion 2d having a smaller diameter than the inner diameter of the mouth portion 2c is formed in the lower end portion of the body 2a. On the other hand, the washer body 3 has an irregularly shaped fitting hole 3a such as irregularities that can be non-rotatably fitted to the mouth portion 2c of the main nut body 2 at the center, and the outer periphery is 6 so as to have a detent function. It is formed in a square shape.

  In FIG. 2, reference numerals 4 and 5 are plate bodies, and these plate bodies 4 and 5 are made of a thin plate such as an aluminum material that cannot be welded or screw-formed, for example. Each plate body 4 and 5 has a main nut body 2. Mounting holes 4a and 5a that allow insertion are formed. Reference numeral 6 denotes a tightening bolt having a polygonal recess 6a at the head, and reference numeral 7 denotes a caulking tool including a rotating shaft 7a and a rotation stopper 7b that can be fitted into the recess 6a. As a matter of course, an existing fastening bolt can be applied as the fastening bolt 6. Further, the mounting holes 4a and 5a may be round holes or square holes.

Next, the operation of the caulking nut 1 will be described.
At the time of use, first, the washer body 3 is fitted to the mouth portion 2c of the main nut body 2 as shown by the phantom line in FIG. 1, and the caulking nut 1 has its lower end as shown in FIG. Inserted into the hexagonal mounting holes 4a and 5a of the plate bodies 4 and 5 made of a thin plate of aluminum material or the like that are stacked two from the side. In that case, the washer body 3 is set at a position where the lower surface of the washer body 3 comes into contact with the upper surface of the mounting hole 4 a of the upper plate 4. Next, the tightening bolt 6 is inserted into the thin inner hole 2b of the main nut body 2 from the upper side, and then the rotary shaft 7a of the caulking tool 7 is fitted into the recess 6a of the tightening bolt 6 and the detent body 7b. Is engaged with the outer periphery of the hexagonal washer body 3 to prevent the washer body 3 from rotating. Thereafter, the rotary shaft 7a of the caulking tool 7 is rotated so that the tightening bolt 6 is screwed into the female screw portion 2c and tightened. Then, since the lower part of the main nut body 2 is attracted to the plate bodies 4 and 5, the thin inner hole 2b of the main nut body 2 is bent outward in the radial direction to form the bulging portion 2e. Then, by further tightening the main nut body 2 with the fastening bolt 6 via the caulking tool 7, as shown in FIG. 2, the upper and lower two plate bodies 4, 5 between the washer body 3 and the bulging portion 2e. Is clamped and clamped. After the caulking is finished, even if the plate bodies 4 and 5 are made of a thin plate such as an aluminum material which cannot be welded or screw-formed by pulling out the caulking tool 7, these plate bodies 4 and 5 should be caulked. To complete the fastening work.

  On the other hand, when the plate bodies 4 and 5 are to be removed and stored, first, the caulking tool 7 is used to lock the washer body 3 with the anti-rotation body 7b as described above, and then the fastening bolt 6 is reversely rotated to be tightened. Loosen the bolt 6 from the main nut body 2 and remove it. Next, the washer body 3 is pulled out from the upper end of the main nut body 2 and removed. Thereby, the main nut body 2 can be removed from the plate bodies 4 and 5. Therefore, the caulking nut 1 and the plate bodies 4 and 5 can be easily disassembled and reused. In particular, when an expensive titanium, stainless steel, or copper caulking nut 1 or an expensive plate 4 or 5 is used, a remarkable economic effect can be obtained.

Next, a method for manufacturing the caulking nut 1 will be described.
As shown in FIG. 3, a solid bar material A having a polygonal cross section and cut to a predetermined length is used. First, one end of the solid bar material A having a circular cross section is forged in the first step. A formed body B composed of the irregularly shaped head B1 and the cylindrical part B2 is formed. Next, in the second step, a washer element body C having a hexagonal shape having a detent function and having a circular hole C1 at the center is punched out in accordance with the outer peripheral shape of the cylindrical portion B2 in the molded body B. A cylindrical body D is formed. After that, in the third step, the cylindrical body D is subjected to forging and drawing to have a thin inner hole E1 that can be caulked in the middle part, and an irregularly shaped mouth part E2 such as irregularities is formed at the upper end, and at the lower end part A cylindrical body E having a bottomed hole E3 having a smaller diameter than the inner diameter of the mouth E2 is formed. In parallel with this, the washer element body C is compressed in the center direction by another forging machine (not shown), and can be non-rotatably fitted to the mouth E2 of the cylindrical body E at the center. A hexagonal washer body 3 having irregularly shaped fitting holes 3a such as irregularities and having a non-rotating function on the outer periphery is formed. Thereafter, in the fourth step, the bottomed hole E3 of the cylindrical body E is punched to have a thin inner hole F1 that can be caulked at the middle part, and a mouth part F2 having an irregular outer periphery at the upper end. A cylindrical body F having a small-diameter hole portion F3 having a smaller diameter than the inner diameter of the mouth portion F2 is formed. Thereafter, in the fifth step, a female screw portion 2c having a smaller diameter than that of the mouth portion F2 is formed in the small-diameter hole portion F3 of the cylindrical body F, so that the outer diameter is uniform and can be caulked as shown in FIG. A main nut body in which a mouth portion 2c having a different outer periphery is formed at the upper end of a cylindrical body 2a having a hole 2b, and a female screw portion 2d having a diameter smaller than the inner diameter of the mouth portion 2c is formed in the lower end portion of the cylindrical body 2a. 2 was produced.

  With this configuration, the caulking nut 1 composed of the main nut body 2 and the washer body 3 can be forged from a single solid round bar-like material in a consistent state by forging without waste of material, and the cost is low. It can be easily and easily manufactured.

  In the above-described embodiment, the outer shape of the washer 3 only needs to be a shape that can exhibit the anti-rotation function. In addition to a hexagonal shape, for example, a polygonal shape such as a pentagonal shape or an octagonal shape or an oval shape is used. It may be an irregular shape including

  Further, the shape of the mouth portion 2c of the main nut body 2 and the fitting hole 3a of the washer 3 are made uneven as in the embodiment, for example, a polygonal shape smaller than the outer shape, or a downward spreading inclination as shown in FIG. It is good also as the opening part 2c 'and fitting hole 3a' of a hexagonal pyramid shape which has a surface. Even in such a configuration, the rotation of the washer body 3 with respect to the main nut body 2 and the fall prevention can be performed.

  It is a partial longitudinal cross-sectional view of the crimping nut which concerns on this invention.   It is a partially-omission longitudinal cross-sectional view which shows the use condition of the same caulking nut.   It is explanatory drawing which shows the manufacturing process of the same caulking nut.   It is a partial longitudinal cross-sectional view of another embodiment of the same caulking nut.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Caulking nut 2 Main nut 2a Cylindrical body 2b Inner hole 2c Mouth part 3 Washer body 3a Fitting hole A Round bar-shaped material B Molded body B1 Head B2 Cylindrical part C Washer body C1 Through-hole D Cylindrical body E Cylindrical body E1 Inside Hole E2 Mouth E3 Bottomed Hole F Cylindrical F1 Inner Hole F2 Mouth F3 Small Diameter Hole

Claims (2)

  A cylindrical portion having a uniform outer diameter and a thin inner hole that can be caulked is formed at the upper end of the cylindrical body, and a female thread portion having a smaller diameter than the inner diameter of the mouth portion is formed in the lower end portion of the cylindrical body. The main nut body and a washer body having an irregularly shaped fitting hole that can be fitted to the mouth of the main nut body at the center, and an irregularly shaped washer body having an anti-rotation function on the outer periphery. A caulking nut featuring.   First, one end of a solid rod-shaped material having a circular cross section is forged to form a molded body composed of an irregularly shaped head and a cylindrical part, and then the head according to the outer peripheral shape of the cylindrical part in the molded body The washer element body and the cylinder body are formed in a different shape with a detent function and having a circular hole in the center, and then the washer element body is compressed in the center direction to form a cylinder in the center. While forming a washer body with an irregularly shaped fitting hole that fits into the upper end of the body, the cylindrical body has a thin-walled inner hole that can be crimped and drawn into the middle part, and within the lower end part. A cylindrical body having a small-diameter hole portion smaller in diameter than the hole and having an irregularly shaped mouth portion into which the fitting hole of the washer body can be fitted at the upper end portion is formed, and then the inside of the small-diameter hole portion of the cylindrical body is formed. A cylindrical body having a thin-walled inner hole having a uniform outer diameter and a female thread portion having a smaller diameter than the inner hole. Manufacture of a caulking nut characterized by forming a main nut body in which a mouth portion having an irregular outer periphery is formed at the upper end and a female thread portion having a diameter smaller than the inner diameter of the mouth portion is formed in the lower end portion of the cylindrical body Method.

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