JPS6250021A - Calking structure member, its calking method and its production - Google Patents

Abstract

PURPOSE:To enable the fixture to the member to be fixed simply and firmly by calking work without any welding by providing the projecting part insertion hole near the tip of a cylindrical part and by providing a groove like pit part at the part connecting the cylindrical part tip and projecting part insertion hole. CONSTITUTION:In case of fixing a nut 1 to the member 6 to be fixed the cylindrical part 2 of the nut 1 is inserted into the fixing hole 7 of the member 6 to be fixed so that a projecting part 8 is inserted into the projecting part insertion hole 4 via the pit part 5 of the nut 1. The nut 1 is set to the lower side metal die 9 by fitting the cylindrical part 2 to the recessed part 9a of the lower side metal die 9 toward the upper part. With the descent of the upper die metal die 10 a slant face 12a is invaded to the inner part of the cylindrical part 2, brought in contact with the back side of the pit part 5 and pushes back the pit part 5 to the outer side. A pressure face 11a presses the cylindrical part in the axial direction further and the intermediate part in the axial direction of the peripheral wall is deformed by return so as to project to the outmost side. The member 6 to be fixed is thus calked at the tip part of the cylindrical part 2 and the nut 1 is completely fixed for the member 6 to be fixed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a caulking structural member that can be fixed to another member by caulking, a caulking method for the same, and a manufacturing method for the same.

2. Description of the Related Art Conventionally, for example, when fixing a nut to another member (hereinafter referred to as a member to be fixed), the nut was generally arc welded or resistance welded to the other member.

Problems to be Solved by the Invention However, the conventional nut fixing method as described above (a) involves high welding costs.

(b) Even if the nut and the member to be fixed are plated,
Since the plating layer is destroyed by welding, plating work is required again for welding repair and rust prevention, which also increases costs.

There were problems such as.

Furthermore, conventionally, similar problems may occur when fixing a member other than a nut to another member.

Purpose of the Invention The present invention has been made to solve the above-mentioned conventional problems, and can be easily and firmly fixed to a member to be fixed by caulking without welding, and can be applied to nuts, etc. To provide a caulking structural member, a caulking method thereof, and a manufacturing method thereof, in which the caulking work does not cause inconveniences such as the inability to pass bolts or screws through the caulking structural member and the member to be fixed. The purpose is to

Means for Solving the Problems A caulking structural member according to the present invention has a cylindrical portion at least in part, and a detent hole is provided near the tip of the cylindrical portion, and A groove-shaped recessed portion that recesses inward of the cylindrical portion is provided at a portion connecting the tip of the cylindrical portion and the detent hole.

Further, the method for caulking a caulking structural member according to the present invention includes: the structural member; a member to be fixed having a fixing hole from which a fitting protrusion is partially projected; a pressing surface wider than the inner circumference of the cylindrical part; A mold comprising: an inner circumferential protection part that protrudes from the pressing surface and has an outer shape approximately equal in size to the inner circumference of the cylindrical part; and a sloped part continuous to the tip side of the inner circumference protection part. and the cylindrical portion of the caulking structural member is attached to the fixing member such that the fitting protrusion of the fixing member is fitted into the detent hole through the recessed portion of the caulking structural member. is inserted into the fixing hole, and in this state, by moving the mold toward the caulking structure member, the slope portion and the inner circumferential protection portion are inserted into the cylindrical portion, and the slope portion is inserted into the cylindrical portion. While pushing back the recessed portion toward the outside, the inner periphery protection portion is opposed to the inner periphery of the cylindrical portion, and the pressing surface presses the cylindrical portion in the axial direction, whereby the cylindrical portion The peripheral wall on the distal end side is folded back and deformed into a U-shaped longitudinal section to caulk the member to be fixed.

In general, the method for manufacturing a caulking structural member according to the present invention includes: a male mold having a depression forming part; a hole punching part adjacent to the depression forming part and projecting from the depression forming part; A female mold having a groove corresponding to the part forming part and a punched hole corresponding to the hole punching part is prepared, and the vicinity of the tip of the cylindrical part of the material is connected to the hole punching part of the male mold. A rotation prevention hole is formed by punching in combination with the punched hole of the female mold, and a rotation prevention hole is formed by punching in combination with the punched hole of the female mold, and a rotation prevention hole is formed in the cylindrical portion by a combination of the depressed portion forming portion of the male mold and the groove portion of the female mold. A portion connecting the tip of the cylindrical portion and the detent hole is recessed inward of the cylindrical portion, and a groove-like recessed portion is formed in the portion.

Operation The caulking structure member according to the present invention becomes unrotatable relative to the fixed member by fitting the fitting protrusion into the detent hole, and the cylindrical portion is roughly deformed into a U-shaped longitudinal section. By caulking the fixing member, it becomes impossible to move in the axial direction, and as a result, the caulking structural member is completely fixed to the member to be fixed.

Example Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

1 to 3 show an embodiment in which the present invention is applied to a nut, and a metal nut 1 has a cylindrical portion 2.
are integrally provided. This cylindrical part 2 is connected to the nut 1
It is coaxial with the screw hole 3 of the nut 1 and protrudes from the bottom of the main body portion 1a of the nut 1. A detent hole 4 is provided in the cylindrical portion 2 .

Roughly speaking, a groove-shaped depressed portion 5 is provided in a portion of the cylindrical portion 2 that connects the tip of the cylindrical portion 2 and the detent hole 4.

FIG. 4 shows an example of a member to be fixed to which the nut 1 is to be fixed. The member 6 to be fixed has a plate shape and is provided with a fixing hole 7. This fixing hole 7 has a generally circular shape with a diameter slightly larger than the outer diameter of the cylindrical portion 2 of the nut 1, and a part of the fixing hole 7 has a fitting protrusion 8 from the surrounding fixed member 6. It protrudes toward the center of the fixing hole 7. The fitting protrusion 8 has a size corresponding to the detent hole 4.

5 to 9 show the work steps of fixing the nut 1 to the member to be fixed 6 by caulking.

First, let me explain the press mold used for this fixing work.
As shown in FIGS. 6 to 9, the lower mold 9 is fixedly installed, and has a hexagonal recess 9a corresponding to the main body 1a of the nut 1 on its upper surface. There is. On the other hand, the upper mold 10 includes a main body 11 and a main body 11.
A protruding member 12 is screwed in the axial direction to the lower part of the main body 11, and the lower end side of the protruding member 12 protrudes below the main body 11. The upper mold 10 is moved up and down above the lower mold 9 by a press machine (not shown).

The pressing surface 11a formed by the bottom surface of the main body 11 has a planar shape extending perpendicularly to the axes of the main body 11 and the protruding member 14, and has an outer diameter sufficiently larger than the inner diameter of the cylindrical portion 2. are doing.

A tapered slope portion 12a is formed at the lowermost end of the protruding member 12. Further, in the protruding member 12, an inner peripheral protection part 12b having an outer diameter slightly smaller than the inner diameter of the cylindrical part 2 is formed continuously on the upper part of the slope part 12a.

In order to fix the nut 1 to the fixed member 6, first, as shown in FIGS. 5 and 6, the fitting protrusion 8 is fitted into the detent hole 4 through the recessed part 5 of the nut 1. The cylindrical portion 2 of the nut 1 is inserted into the fixing hole 7 of the member to be fixed 6. As a result, the nut 1 cannot rotate relative to the fixed member 6.

Then, in this state, the nut 1 is set in the lower mold 9 by pushing the cylindrical portion 2 upward and fitting into the recess 9a of the lower mold 9, as shown in FIG. Incidentally, at this time, the axes of the main body 11 and the protruding member 12 of the upper mold 10 are made to coincide with the axis of the nut 1.

Next, when the upper mold 10 is lowered in this state, the seventh
As shown in the figure, the sloped part 12a first penetrates into the inside of the cylindrical part 2, and the sloped part 12a comes into contact with the back side of the recessed part 5, pushing the recessed part 5 back to the outside as shown in FIG.

As the upper mold 10 is further lowered, the pressing surface 11a presses the cylindrical part 2 in the axial direction, so that the peripheral wall of the cylindrical part 2
As shown in FIG. 9, the middle portion is bulged outward and further bent to form a U-shaped longitudinal section.

As a result, the fixed member 6 is in a state of being caulked by the tip of the cylindrical portion 2 (FIG. 10 shows a bottom view of the nut 1 after such caulking work is completed).
, the nut 1 not only cannot rotate relative to the fixed member 6, but also cannot move in the axial direction. Therefore, the nut 1 is completely fixed to the member 6 to be fixed.

As described above, according to the present invention, the nut 1 can be fixed to the member to be fixed 6 by caulking without using welding.
Fixing work can be done at low cost.

Furthermore, according to the present invention, if pre-plated members are used as the member to be fixed 6 and the nut 1 (for example, if a plated steel plate is used as the member to be fixed 6), the plating layer will be destroyed by welding as in the conventional case. Because it will never be done,
After fixing the nut 1 to the member to be fixed 6, there is no need to re-plate it, and rust prevention can be achieved in that state, so costs can be reduced in this aspect as well.

Further, according to the caulking method of the present invention, the cylindrical portion 2 is deformed with the inner peripheral protection portion 12b of the mold 10 inserted therein, so that the cylindrical portion 2 is screwed by the caulking operation. There is no problem in that the bolt or screw (not shown) screwed into the screw hole 3 collides with the cylindrical portion 2 due to deformation inward from the hole 3.

Roughly speaking, according to the present invention, the peripheral wall of the cylindrical part 2 is folded back and deformed to have a U-shaped longitudinal section, and in this deformed part, the cylindrical part 2
Since the circumferential walls are in a double overlapping state, the caulking strength can be increased.

In addition, as previously proposed by the present applicant in Utility Application No. 1983-73517 and Japanese Patent Application No. 60-131944,
Instead of the detent hole 4 and the recessed part 5 in the present invention,
A similar caulking operation can be performed even if a cut is provided in the axial direction of the cylindrical portion 2, but in that case, the tip of the cylindrical portion 2 becomes discontinuous due to the presence of the cut, and the caulking strength decreases. In the case of the present invention, the tip of the cylindrical portion 2 is the depressed portion 5.
Since the lines are continuous, the above-mentioned inconvenience does not occur.

Next, an example of a method for manufacturing the nut 1 will be described.

FIG. 11 shows the raw material 1' of the nut 1 before machining the detent hole 4 and the recessed part 5 in the cylindrical part 2, and this raw material 1'
At this stage, the cylindrical portion 2 has a complete cylindrical shape.

12 to 16 show a press mold for manufacturing the nut 1. FIG. To explain this, the base 16 has
A lifting guide 17 is fixed, and this lifting guide 17
A female support 18 is fitted above a stopper stand 26 fixed to the base 16 so as to be movable up and down. One compression coil spring (see FIG. 14) is interposed between the base 16 and the female support 18.
One urges the Ili type support 18 upward.

The Ill type support 18 has a female mold 20 having a generally rod shape.
is fixed horizontally. At the tip of the female die 20, there is a screw hole fitting part 21 into which the screw hole 3 of the material 1' is fitted.
is provided. Further, the female mold 20 includes a material 1'
A cylindrical part fitting part 22 into which the cylindrical part 2 is fitted is provided adjacent to the screw hole fitting part 21.
2, a handling hole 23 is vertically penetrated therethrough.

Further, in the old model 22, an intermediate portion 24 having a diameter larger than the inner diameter of the cylindrical portion 2 is provided adjacent to the cylindrical portion fitting portion 22. A groove 2 is provided in the upper part of the cylindrical part fitting part 22 and the intermediate part 24 along the axial direction of the old model 20.
5 is provided. Material rotation prevention members 27 are fixed to both ends of the stopper stand 26 so as to sandwich the screw hole fitting portions 21 of the female mold 20 at a constant interval.

The male die 30 used in this example is shown in FIGS. 15 and 16.
and Fig. 17, etc. This male mold 30 has a main body 31
and a processing member 32 fixed to the main body 31, the lower end of the processing member 32 protruding downward from a recess 33 formed in the lower end of the main body 31. A linear depression forming portion 34 is provided at the lower end of the processing member 32.
A recessed part 35 is formed which protrudes further downward from the recessed part 34.

Next, the manufacturing process of the nut 1 in this example will be explained.

First, as shown in FIG.
Then, the cylindrical portion 2 and the screw hole 3 of the material 1' are fitted into the screw hole fitting portion 21, respectively. At this time, the material 1' is oriented such that the main body portion 1a is sandwiched between the material rotation prevention members 27 and cannot rotate relative to the base 16, as shown in FIG.

Next, when the male mold 30 is lowered, the striking part 35 comes into contact with the cylindrical part 2, and the material 1' is pushed into the female mold 20 against one spring.
and lowered together with the female support member 18. As a result, as shown in FIG. 19, the cylindrical portion 2 of the material 1' and the intermediate portion 25 of the female mold 20 come into contact with the stopper stand 26, and the female mold 20 cannot be lowered any further.

Therefore, if the male mold 30 continues to be lowered after that, as shown in FIG. Then, the depression forming part 34 pushes a predetermined portion of the cylindrical part 2 into the groove part 25 of the female die 2° to form a rotation prevention hole 4, thereby forming a depression 5.

In this embodiment, since the detent hole 4 is punched and the recessed portion 5 is formed while the female mold 20 is supported by the stopper stand 26, an unreasonable force is applied to the female mold 2o and the female mold 20 is
This can avoid inconveniences such as breakage.

However, if the nut 1 to be processed is large and the thickness of the female die 20 can be made thicker, the female die 2o should be fixedly installed without being able to be raised or lowered, and supported from below with something like a stopper stand 26. It is also possible to carry out the above-mentioned press working in a state where the material is still intact.

FIG. 21 shows another embodiment of the nut according to the invention.

In the embodiment described above, only one detent hole 4 and one recessed part 5 were provided in one nut 1, but in this embodiment, one
Two detent holes 4 and a recessed part 5 are provided in the nut 1,
They are provided at positions that are 180 degrees apart from each other. Here, the two detent holes 4 and the recessed portions 5 may be formed one by one one by one, for example, by the method described in the above embodiment, or the two male molds may be formed simultaneously from both sides of the cylindrical portion 2. By advancing toward this direction, two detent holes 4 and two recessed portions 5 may be processed at the same time.

When a plurality of detent holes 4 and recessed portions 5 are provided in one nut 1 as in this embodiment, the same number of fitting protrusions are provided on the member to be fixed, and each of these fitting protrusions is It can fit into each detent hole 4.

22 to 24 show an embodiment of a mold for caulking the nut 1 shown in FIG. 21, which is provided with two detent holes 4 and two recessed portions 5. In this embodiment, two planar inclined surfaces 12c are provided at the lower end of the workpiece 12 of the upper mold 10 at positions that are 180 degrees apart from each other. Further, a curved slope portion 12d is provided at a portion of the lower end portion of the processing member 12 other than the slope portion 12c. Further, in the protrusion member 12, an inner peripheral protection portion 12e having an outer diameter slightly smaller than the inner diameter of the cylindrical portion 2 is formed continuously above the slope portions 12G and 12d.

In this embodiment as well, caulking work can be performed in the same manner as in the previous embodiment, but during this caulking work,
As shown in FIG. 22, the depressed portion 5 of 2g is pushed back to the outside by the two planar slope portions 12c.

In addition, although the embodiments so far have shown cases in which the present invention is applied to nuts, the present invention can also be applied to members other than nuts.

Further, in the embodiments described above, the cylindrical portion is cylindrical, but in the present invention, the cylindrical portion may be formed into a rectangular cylindrical shape.

In addition, in the nut 1 in the embodiments so far, only a part thereof is cylindrical, but in the present invention, the nut 1 is cylindrical.
The structural member may have a cylindrical shape as a whole.

25 to 27 show an embodiment in which the present invention is applied to a square pipe.

To explain this, near the tip of the metal square pipe 43, there are two detent holes 44 at positions 180 degrees apart from each other.
There are several. A groove-shaped depression 45 is provided between these detent holes 44 and the tip of the square pipe 43. These detent holes 44 and recessed portions 45 can be processed in the same manner as in the case of the nut described above.

Reference numerals 46 and 47 indicate a lower mold and an upper mold for caulking the square pipe 43, respectively. The upper mold 47 is
8 and a protruding member 49. The bottom surface of the main body 4B constitutes a pressing surface 48a, and this pressing surface 48a has an area sufficiently larger than the inner circumference of the square pipe 43. The protruding member 49 is fixed to the lower part of the center of the pressing surface 48a of the main body 48 by pins 1 to 50. At the lower end of the protrusion member 49, planar slope portions 49a are provided at positions that are 180 degrees apart from each other. Further, the protruding member 49 is provided with an inner circumferential protection portion 49b that has substantially the same cross-sectional shape as the inner circumferential portion of the square pipe 43 and is continuous to the upper portion of the slope portion 49a.

In this embodiment as well, by providing a fixing hole having a fitting protrusion in a shape corresponding to the square pipe 43 in the fixed member 51, the tip of the square pipe 43 can can be caulked.

FIG. 28 shows a roughly alternative embodiment of the invention.

In this embodiment as well, the square pipes 43 each have 18
Two detent holes 44 and groove-shaped depressions 45 are provided at the 0 degree positions, but the distances from the tip of the square pipe 43 to the two detent holes 44 are different. Therefore, the lengths of the two depressions 45 are also different.

Therefore, by fitting the two fitting protrusions 52 provided on the fixed member 60 into the detent holes 44 and performing the caulking work in the same manner as in each of the above embodiments, the fixed member 60 can be attached to the square pipe 44. (FIG. 28 shows the state before caulking work). and,
Such a structure can be applied to, for example, handrails of stairs.

Effects of the Invention As described above, the present invention has the following advantages: (a) The caulking structure member can be easily fixed to the member to be fixed by caulking work without welding, so the cost of the fixing work can be reduced. If pre-plated members are used as the caulking structural member and the fixed member, the plating layer will not be destroyed by welding, so after fixing the caulking structural member to the fixed member, re-plating is performed. It is not necessary and rust prevention can be achieved in the same state.

(b) Since the cylindrical part can be deformed while the inner peripheral protection part of the mold is inserted into the cylindrical part, even when applied to nuts etc., the cylindrical part will not be deformed inward by caulking work. ,
This eliminates the problem of not being able to pass bolts or screws through the cylindrical portion and the member to be fixed.

(c) According to the caulking method of the present invention, the circumferential wall of the cylindrical portion is folded back and deformed into a U-shaped longitudinal section, and in this deformed portion, the circumferential wall of the cylindrical portion is in a double overlapping state, so that caulking is not possible. Strength can be increased.

(d) The tip of the cylindrical part is continuous with the depression, so
The caulking strength can be further increased.

It is possible to obtain excellent effects.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a nut which is an embodiment of the caulking structural member according to the present invention, FIG. 2 is a bottom view showing the nut, FIG. 3 is a front view showing the nut, and FIG. 4 is a cross-sectional view showing the nut. FIG. 5 is a bottom view showing an example of a member to be fixed to which the nut is fixed, FIG. 5 is a bottom view showing a state in which the nut and the member to be fixed are fitted together, and FIGS. FIG. 10 is a bottom view showing the state of the nut and the object to be fixed after the caulking work is completed; FIG. 11 is a half-sectional view showing the material of the nut;
FIG. 12 is a plan view showing a mold for processing the nut (excluding the male mold), FIG. 13 is a front view of the mold, and FIG. 14 is a cross section taken along line 8-A in FIG. 12. Figure 15 is a front view showing a male die for processing the nut, and Figure 1
FIG. 6 is a rear view showing the male die, FIGS. 17 to 20 are process diagrams showing the process of processing the nut, and FIG. 22 is a sectional view showing the crimping operation of the nut, FIG. 23 is a bottom view showing the upper mold in FIG. 22, FIG. 24 is a sectional view taken along line BB in FIG. 23, FIG. 25 is a sectional view showing another embodiment of a caulking structural member according to the present invention and a mold for caulking the caulking structural member, FIG. 26 is a view taken along the line C-C in FIG. 25, Figure 27 is the 25th
FIG. 28 is a sectional view showing roughly another embodiment of the caulking structural member according to the present invention. 1... Nut, 1'... Material, 2... Cylindrical part, 4
... Detent hole, 5 ... Recessed part, 6 ... Fixed member, 7 ... Fixing hole, 8 ... Fitting projection, 10 ... Upper mold, 11a ... Pressing Surface, 12a...Slope portion, 12
b...Inner circumference protection part, 12C...Slope part, 12e...
- Inner periphery protection part, 25... Groove part, 34... Recessed part forming part, 35... Beating part, 43... Square pipe, 44
... Detent hole, 45 ... Concave part, 48a ... Pressing surface, 49a ... Slope part, 49b ... Inner circumference protection part,
51... Fixed member, 52... Fitting protrusion, 6°...
・Fixed member. Patent Applicant Kitaura Kogyo Agent Co., Ltd. Patent Attorney Izumi Daigaru Figure 6 Figure 8 Figure 1 SS Figure 10 Figure 12 [ Figure 13 Figure 14B Figure 15 Figure 16 Figure 17 Figure 20 Figure 21 Figure 22 Figure 23 Figure 24 Figure 25 Procedural amendment September 2, 1986 Commissioner of the Japan Patent Office Kuro 1) Yu Akira 1, Indication of fact 1 Comparison with Patent Application No. 188596 of 1985 Related Column for brief description of patent applicant's drawings and Figures 7 and 8 of the drawings
(No national history) Specification 1, Name of the invention, caulking structural member, caulking method thereof, and manufacturing method thereof 2, Claims 1) Having a cylindrical part at least in part, and a protruding part near the tip of the cylindrical part A groove-shaped recessed part that is provided with an insertion hole and that recesses inward of the cylindrical part is provided in a portion of the cylindrical part that connects the tip of the cylindrical part and the protrusion insertion hole. A caulking structural member characterized by being provided. 2) At least a part of the tubular part has a cylindrical part, and a protruding part insertion hole is provided near the tip of the cylindrical part, and the tip of the cylindrical part of the cylindrical part and the protruding part insertion hole a caulking structure member provided with a groove-like recessed part that recesses inward of the cylindrical part at the part connecting the two parts; a fixing member; a pressing surface wider than the inner periphery of the cylindrical portion; an inner periphery protection portion protruding from the pressing surface and having an outer periphery approximately equal in size to the inner periphery of the cylindrical portion; a mold having a sloped portion continuous to the tip side of the protective portion; The cylindrical portion of the caulking structural member is inserted into the fixing hole of the member to be fixed, and in this state, by moving the mold toward the caulking structural member, the inclined surface portion and the The inner periphery protection part is inserted into the cylindrical part and the slope part pushes back the depressed part outwardly, and the inner periphery protection part is opposed to the inner periphery of the cylindrical part, and the pressing surface The cylindrical part is pressed in the axial direction, thereby folding the peripheral wall on the distal end side of the cylindrical part so that the intermediate part of the peripheral wall in the axial direction protrudes outward. A method for caulking a caulking structural member, the method comprising caulking the member to be fixed. 3) A male mold having a depression forming part, a hole casting part adjacent to the depression forming part and protruding from the depression forming part, a groove corresponding to the depression forming part, and the hole. A female mold having a punched hole corresponding to the punched part is prepared, and the vicinity of the tip of the cylindrical part of the material is punched using a combination of the hole punched part of the male mold and the punched hole of the female mold. The tip of the cylindrical portion of the cylindrical portion and the end 1α sleeper are formed by a combination of the depressed portion forming portion of the male type and the groove portion of the M shape. 15. A method for manufacturing a caulking structural member, characterized in that a portion of the cylindrical portion 7S is depressed toward the inside of the cylindrical portion to form a groove-shaped depressed portion in the portion. 3. Detailed Description of the Invention Field of Industrial Application The present invention relates to a caulking structural member that can be fixed to another member by caulking, a caulking method thereof, and a manufacturing method thereof. BACKGROUND OF THE INVENTION Conventionally, for example, when fixing a nut to another member (hereinafter referred to as a member to be fixed), the nut was generally arc welded or resistance welded to the other member.Problems to be Solved by the Invention However, the conventional nut fixing method as described above (a) has high welding costs. (b) Even if the nut and the member to be fixed are plated,
Since the plating layer is destroyed by welding, plating work is required again to prevent rust after welding, which also increases costs. Problems such as these were rare. Further, in the past, similar problems sometimes occurred when fixing a member other than a nut to a fixed member. OBJECT OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the conventional art. The present invention provides a caulking structural member, a caulking method thereof, and a caulking method thereof, which does not cause inconveniences such as the inability to pass bolts or screws through the caulking structural member and the member to be fixed due to the caulking work, even when applied to The purpose is to provide a manufacturing method. Means for Solving the Problems A caulking structural member according to the present invention has a cylindrical portion at least in part, and a projection insertion hole is provided near the tip of the cylindrical portion. A groove-shaped recessed portion that recesses inward of the cylindrical portion is provided at a portion connecting the tip of the cylindrical portion and the protrusion insertion hole. A method for caulking a structural member includes: the structural member; a fixing hole; a member to be fixed having a protruding portion protruding with respect to the fixing hole; a pressing surface wider than the inner periphery of the cylindrical portion; A mold comprising an inner circumferential protection part that protrudes from the pressing surface and has an outer circumference approximately equal in size to the inner circumference of the cylindrical part, and a sloped part continuous to the tip side of the inner circumference protection part. preparing the cylindrical part of the caulking structural member to fix the member to be fixed such that the protruding part of the member to be fixed is inserted into the protruding part insertion hole through the recessed part of the caulking structural member; The mold is inserted into the hole, and in this state, by moving the mold toward the caulking structural member, the slope portion and the inner circumferential protection portion enter into the cylindrical portion, and the slope portion closes the depressed portion. is pushed back toward the outside, and with the inner periphery protecting portion facing the inner periphery of the cylindrical portion, the cylindrical portion is pressed in the axial direction with the pressing surface, thereby pushing the tip side of the cylindrical portion The fixing member is caulked by bending and deforming the circumferential wall of the circumferential wall so that the intermediate portion in the axial direction of the circumferential wall projects outwardly.Roughly speaking, the method for manufacturing a caulking structural member according to the present invention includes: a male die having a depressed part forming part; a rounded part adjacent to the depressed part forming part and protruding from the depressed part forming part; a groove corresponding to the depressed part forming part; and the rounded part formed by the depressed part forming part; A female mold having a punched hole corresponding to the hole is used, and the vicinity of the tip of the cylindrical part of the material is cut with a combination of the rounded part of the male mold and the punched hole of the female mold. A protrusion insertion hole is formed by punching, and the tip of the cylindrical part of the cylindrical part and the protrusion are formed by combining the depressed part forming part of the male mold and the L-shaped groove part. The part connecting with the insertion hole is depressed inward of the cylindrical part, and a groove-shaped depression is formed in the part. Function: In the present invention, the protruding part of the member to be fixed is caulked. By being inserted into the protrusion insertion hole of the structural member, the caulking structural member and the member to be fixed become relatively unrotatable (note that
When the cylindrical portion and the fixing hole are non-circular, even if they are fitted into each other, the caulking structure member and the fixed member cannot rotate relative to each other). Furthermore, the circumferential wall of the cylindrical portion is folded back and deformed so that the axially intermediate portion of the circumferential wall protrudes outwardly, and the fixed member is caulked, so that the caulking structure member and the fixed member are axially is also relatively immobile. Therefore, the caulking structural member is completely fixed to the member to be fixed. EXAMPLES The present invention will be explained below based on examples shown in the drawings. 1 to 3 show an embodiment in which the present invention is applied to a nut, and a metal nut 1 has a cylindrical portion 2.
are integrally provided. This cylindrical part 2 is connected to the nut 1
It is coaxial with the screw hole 3 of the nut 1 and protrudes from the bottom of the main body portion 1a of the nut 1. The cylindrical portion 2 is provided with a protrusion insertion hole 4 . Roughly speaking, a groove-shaped depression 5 is provided in a portion of the cylindrical portion 2 that connects the tip of the cylindrical portion 2 and the protrusion insertion hole 4 . FIG. 4 shows an example of a member to be fixed to which the nut 1 is to be fixed. The member 6 to be fixed is plate-shaped and provided with a fixing hole 7. This fixing hole 7 has a generally circular shape with a diameter slightly larger than the outer diameter of the cylindrical portion 2 of the nut 1, and a portion of the fixing hole 7 is connected to the protruding portion 8 from the surrounding fixed member 6. It protrudes toward the center of the fixing hole 7. The protrusion 8 has a size corresponding to the protrusion insertion hole 4. 5 to 9 show the work steps of fixing the nut 1 to the member to be fixed 6 by caulking. First, let me explain the press mold used for this fixing work.
As shown in FIGS. 6 to 9, the lower mold 9 is fixedly installed, and has a hexagonal recess 9a corresponding to the main body 1a of the nut 1 on its upper surface. There is. On the other hand, the upper mold 10 includes a main body 11 and a main body 11.
A protruding member 12 is screwed in the axial direction to the lower part of the main body 11, and the lower end side of the protruding member 12 protrudes below the main body 11. The upper mold 10 is moved up and down above the lower mold 9 by a press machine (not shown). The pressing surface 11a formed by the bottom surface of the main body 11 has a planar shape extending perpendicularly to the axes of the main body 11 and the protruding member 14, and has an outer diameter sufficiently larger than the inner diameter of the cylindrical portion 2. ing. A tapered slope portion 12a is formed at the lowermost end of the protruding member 12. Further, the protruding member 1
2, an inner peripheral protection part 12b having an outer diameter slightly smaller than the inner diameter of the cylindrical part 2 is formed continuously at the upper part of the slope part 12a. To fix the nut 1 to the fixed member 6, first, as shown in FIGS. 5 and 6, insert the protrusion 8 into the protrusion insertion hole 4 through the recess 5 of the nut 1. Natsu 1
The cylindrical portion 2 is inserted into the fixing hole 7 of the fixed member 6. As a result, the nut 1 cannot rotate relative to the fixed member 6. Then, in this state, the nut 1 is fitted into the recess 9a of the lower mold 9 with the cylindrical portion 2 facing upward as shown in FIG. 6, and set in the lower mold 9. At this time, the axes of the main body 11 and the protruding member 12 of the upper mold 10 are made to coincide with the axis of the nut 1. Next, when the upper mold 10 is lowered in this state, the seventh
As shown in the figure, the sloped part 12a first enters the inside of the cylindrical part 2, and the sloped part 12a comes into contact with the back side of the recessed part 5, pushing the recessed part 5 back to the outside as shown in FIG. As the upper mold 10 is roughly lowered, the pressing surface 11a presses the cylindrical part 2 in the axial direction, so that the peripheral wall of the cylindrical part 2 is
As shown in FIG. 9, the axially intermediate portion of the peripheral wall is folded back and deformed so as to protrude to the outermost side. As a result, the fixed member 6 is in a state of being caulked by the tip of the cylindrical portion 2 (FIG. 10 shows a bottom view of the nut 1 after such caulking work is completed).
, the nut 1 not only cannot rotate relative to the fixed member 6, but also cannot move in the axial direction. Therefore, the nut 1 is completely fixed to the member 6 to be fixed. As described above, according to the present invention, the nut 1 can be fixed to the member to be fixed 6 by caulking without using welding.
Fixing work can be done at low cost. Furthermore, according to the present invention, if pre-plated members are used as the member to be fixed 6 and the nut 1 (for example, if a plated steel plate is used as the member to be fixed 6), the plating layer will be destroyed by welding as in the conventional case. Because it will never be done,
After fixing the nut 1 to the member to be fixed 6, there is no need to re-plate it, and rust prevention can be achieved in that state, so costs can be reduced in this aspect as well. Further, according to the caulking method of the present invention, the cylindrical portion 2 is deformed with the inner peripheral protection portion 12b of the mold 10 inserted therein, so that the cylindrical portion 2 is screwed by the caulking operation. There is no problem in that the bolt or screw (not shown) that is screwed into the screw hole 3 collides with the cylindrical portion 2 due to deformation inward from the hole 3. Roughly speaking, according to the present invention, the circumferential wall of the cylindrical portion 2 is folded back and deformed, and in this deformed portion, the circumferential wall of the cylindrical portion 2 is in a double overlapping state, so that the caulking strength can be increased. . In addition, as previously proposed by the present applicant in Utility Application No. 1983-73517 and Japanese Patent Application No. 60-131944,
The same caulking work can be performed by providing a notch in the axial direction of the cylindrical part 2 instead of the protruding part insertion hole 4 and the recessed part 5 in the present invention, but in that case, the tip of the cylindrical part 2 However, in the case of the present invention, since the tip of the cylindrical part 2 is continuous due to the recessed part 5, the above-mentioned problem does not occur. Next, an example of a method for manufacturing the nut 1 will be described. FIG. 11 shows a protrusion insertion hole 4 and a depression 5 in the cylindrical part 2.
Indicates the material 1' of nut 1 before processing, and this material 1
At the stage ', the cylindrical portion 2 has a complete cylindrical shape. 12 to 16 show a press mold for manufacturing the nut 1. As shown in FIG. To explain this, the base 16 has
A lifting guide 17 is fixed, and this lifting guide 17
A female support 18 is fitted above a stopper stand 26 fixed to the base 16 so as to be movable up and down. A compression coil spring 19 (see FIG. 14) is interposed between the base 16 and the female support 18, and this spring]
9 urges the female support 18 upward. The Ill type supporting body includes a female mold 20 having a roughly rod shape.
is fixed horizontally. At the tip of the female die 20, there is a screw hole fitting part 21 into which the screw hole 3 of the material 1' is fitted.
is provided. Further, the female mold 20 includes a material 1'
A cylindrical part fitting part 22 into which the cylindrical part 2 is fitted is provided adjacent to the screw hole fitting part 21.
2, a handling hole 23 is vertically penetrated therethrough. Roughly speaking, the female mold 22 is provided with an intermediate portion 24 adjacent to the cylindrical portion fitting portion 22 and having a diameter larger than the inner diameter of the cylindrical portion 2 . A groove 25 is provided in the upper part of the cylindrical part fitting part 22 and the intermediate part 24 along the axial direction of the i-shape 20. A mill rotation prevention member 27 is fixed to both ends of the stopper stand 260 so as to sandwich the screw hole fitting portion 21 of the female die 20 at a constant interval. The male die 30 used in this example is shown in FIGS. 15 and 16.
and Fig. 17, etc. This male mold 30 has a main body 31
and a processing member 32 fixed to the main body 31, the lower end of the processing member 32 protrudes downward from a recess 33 formed in the lower end of the main body 3. A linear depression forming portion 34 is provided at the lower end of the processing member 32.
A dented portion 35 is formed which protrudes further downward from the recessed portion 34. Next, the manufacturing process of the nut 1 in this example will be explained. First, as shown in FIG.
Then, the cylindrical portion 2 and the screw hole 3 of the material 1' are fitted into the screw hole fitting portion 21, respectively. At this time, the material 1' is oriented such that the main body portion 1a is sandwiched between the material projection insertion members 27 and cannot rotate relative to the base 16, as shown in FIG. Next, when the male mold 30 is lowered, the handling part 35 comes into contact with the cylindrical part 2, and the material 1' is moved into the dish mold 20 against the spring 19.
and lowered together with the female support member 18. As a result, as shown in FIG. 19, the cylindrical portion 2 of the material 1' and the intermediate portion 25 of the female mold 20 come into contact with the stopper stand 26, and the female mold 20 cannot be lowered any further. Therefore, if the male mold 30 continues to descend thereafter, the punching portion 35 first enters the punching hole 23 of the female mold 20 and punches the cylindrical portion 2, as shown in FIG. The protrusion insertion hole 4 is formed by folding the tube, and then the depression forming part 34 pushes a predetermined portion of the cylindrical part 2 into the groove 25 of the female die 20 to cause the depression 5 to form. In this embodiment, since the protrusion insertion hole 4 is punched and the depression 5 is formed while the female mold 20 is supported by the stopper stand 26, an excessive force is applied to the female mold 20 and the old mold 2
Inconveniences such as 0 being broken can be avoided. However, if the oaks 1 to 1 to be processed are large and the thickness of the female mold 20 can be increased, Il! It is also possible to perform the above-described press working with the It mold 20 fixedly installed without being able to rise and fall, and without being supported from below by something like the stopper stand 26. FIG. 21 shows another embodiment of the nut according to the invention. In the above embodiment, only one protrusion insertion hole 4 and one depression 5 were provided in one nut 1, but in this embodiment,
Two protruding part insertion holes 4 and a recessed part 5 in one nut 1
are provided at positions that are 180 degrees apart from each other. Here, each of the two protrusion insertion holes 4 and the depression f'X
155 may be machined one by one one by one using the method described in the above embodiment, or by advancing two male molds toward the cylindrical part 2 from both sides at the same time, two protrusions each can be formed. The insertion hole 4 and the recessed portion 5 may be processed at the same time. When a plurality of protrusion insertion holes 4 and recessed parts 5 are provided in one nut 1 as in this embodiment, the same number of protrusions are provided in the member to be fixed, and each of these protrusions is It can be fitted into the protrusion insertion hole 4. 22 to 24 show an embodiment of a mold for caulking the nut 1 shown in FIG. 21, which is provided with two protruding part insertion holes 4 and two recessed parts 5. In this embodiment, two planar inclined surfaces 12c are provided at the lower end of the workpiece 12 of the upper mold 10 at positions that are 180 degrees apart from each other. Also, a slope portion 12C of the lower end portion of the processing member 12
A curved slope portion 12d is provided in the other portions. Further, in the protruding member 12, an inner peripheral protection portion 12e having an outer diameter slightly smaller than the inner diameter of the cylindrical portion 2 is formed continuously at the upper part of the slope portions 12C and 12d. In this embodiment as well, caulking work can be performed in the same manner as in the previous embodiment, but during this caulking work,
As shown in FIG. 22, the two depressions 5 are pushed back outward by the two planar slopes 12G. Note a3: Although the above embodiments have shown cases in which the present invention is applied to nuts, the present invention can also be applied to members other than nuts. Further, in the embodiments described above, the cylindrical portion is cylindrical, but in the present invention, the cylindrical portion may be formed into a rectangular cylindrical shape. Further, in the nut 1 in the embodiments described above, only a portion thereof is cylindrical, but the caulking structure member according to the present invention may have a cylindrical shape as a whole. 25 to 27 show an embodiment in which the present invention is applied to a square pipe. To explain this, two protrusion insertion holes 44 are provided near the tip of the metal square pipe 43 at positions 180 degrees apart from each other. A groove-shaped depression 45 is provided between these protrusion insertion holes 44 and the tip of the square pipe 43. These protrusion insertion holes 44 and depressions 4
5 can be processed by the same method as in the case of the nut described above. Reference numerals 46 and 47 indicate a lower mold and an upper mold for caulking the square pipe 43, respectively. The upper mold 47 is
It has a main body 48 and a protruding member 49. The main body 4
8 constitutes a pressing surface 48a, and this pressing surface 4
8a has a sufficiently larger area than the inner circumference of the square pipe 43. The protruding member 49 is fixed to the lower part of the center of the pressing surface 48a of the main body 48 by a port 50. At the lower end of the protruding member 49, at positions that are 180 degrees apart from each other,
A planar slope portion 49a is provided. The protrusion member 49 has an inner peripheral protection portion 49b having a cross-sectional shape substantially the same as the inner peripheral portion of the square pipe 43. Also in this embodiment, the square pipe 43 is provided on the fixed member 51.
By providing a square-shaped fixing hole corresponding to the fixing hole and a protrusion that protrudes from the fixing hole and is inserted into the protrusion insertion hole 44, the tip of the square pipe 43 can be fixed in the same manner as in each of the above embodiments. The member 51 can be caulked. In addition, when the cylindrical part and the fixing hole are non-circular as in the case of this example, not only the protruding part of the fixed member is inserted into the protruding part insertion hole of the caulking structure member, but also the cylindrical part and the fixing hole are non-circular. The shaped portion and the fixing hole cannot rotate relative to each other with respect to the representing member. FIG. 28 shows a roughly alternative embodiment of the invention. In this embodiment as well, the square pipes 43 each have 18
Two protrusion insertion holes 44 and a groove-shaped recess 45 are provided at the 0 degree position, but the distances from the tip of the square pipe 43 to the two protrusion insertion holes 44 are different. Therefore, the lengths of the two depressions 45 are also different. Therefore, the two protrusions 5 provided on the member to be fixed 60
2 into the protrusion insertion holes 44, and perform the caulking work in the same manner as in each of the above embodiments, the fixed member 60 can be fixed diagonally to the square pipe 43 (note that the 28th The figure shows the state before caulking.And,
Such a structure can be applied, for example, to semi-rigid stairs. Effects of the Invention As described above, the present invention has the following advantages: (a) The caulking structure member can be easily fixed to the member to be fixed by caulking work without welding, so the cost of the fixing work can be reduced. If pre-plated members are used as the caulking structural member and the fixed member, the plating layer will not be destroyed by welding, so after fixing the caulking structural member to the fixed member, re-plating is performed. It is not necessary and rust prevention can be achieved in the same state. (b) Since the cylindrical part can be deformed while the inner peripheral protection part of the mold is inserted into the cylindrical part, even when applied to nuts etc., the cylindrical part will not be deformed inward by caulking work. ,
There is no problem in that it becomes impossible to pass a bolt or screw through the cylindrical portion and the member to be fixed. (c) According to the caulking method of the present invention, the circumferential wall of the cylindrical portion is deformed by folding back, and in this deformed portion, the circumferential wall of the cylindrical portion is in a double overlapping state, so that it is possible to increase the caulking strength. can. (d) The tip of the cylindrical part is continuous with the depression, so
The caulking strength can be further increased. This provides an excellent effect. 4. Brief description of the drawings FIG. 1 is a sectional view showing a nut which is an embodiment of the caulking structural member according to the present invention, FIG. 2 is a bottom view of the nut, and FIG. 3 is a front view of the nut. , FIG. 4 is a bottom view showing an example of the member to be fixed to which the nut is fixed, FIG. 5 is a bottom view showing a state in which the nut and the member to be fixed are fitted together, and FIGS. 6 to 9 10 is a bottom view showing the state of the nut and the object to be fixed after the completion of the crimping work, and FIG. 11 shows the material of the nut. A half-sectional view showing,
FIG. 12 is a plan view showing a mold for processing the nut (excluding the male mold), FIG. 13 is a front view of the mold, and FIG. 14 is a cross section taken along line A-A in FIG. 12. Figure 15 is a front view showing a male die for processing the nut, and Figure 1
FIG. 6 is a rear view showing the male die, FIGS. 17 to 20 are process diagrams showing the process of processing the nut, and FIG. 22 is a sectional view showing the crimping operation of the nut, FIG. 23 is a bottom view showing the upper mold of FIG. 22,
Figure 24 is a sectional view taken along the line B-B in Figure 23;
The figure is a sectional view showing another embodiment of a caulking structural member according to the present invention and a mold for caulking the caulking structural member;
Fig. 26 is a view taken along the line C-C in Fig. 25, and Fig. 27 is a view of the second
FIG. 5 is a view taken along line D-D in FIG. 5, and FIG. 28 is a sectional view showing still another embodiment of the caulking structural member according to the present invention. 1... Nut, 1'... Material, 2... Cylindrical part, 4
... Protrusion insertion hole, 5... Recessed part, 6... Fixed member, 7... Fixing hole 1.8... Projection, 10...
Upper mold, 11a...pressing surface, 12a...slope portion,
12b...Inner circumference protection part, 12C...Slope part, 12e
... Inner periphery protection part, 25... Groove part, 34... Recessed part forming part, 35... Beating part, 43... Square pipe,
44... Protruding part insertion hole, 45... Recessed part, 48a.
...Press surface, 49a...Slope portion, 49b...Inner circumferential protection portion, 51...Fixed member, 52...Protrusion portion, 60
...Fixed member. Patent applicant Kitaura Industrial Agent Co., Ltd. Patent attorney Izumi Daigaric Figure 7 Figure 8

Claims (1)

[Scope of Claims] 1) At least a portion thereof has a cylindrical portion, and a detent hole is provided near the tip of the cylindrical portion, and the tip of the cylindrical portion of the cylindrical portion and the A caulking structure member characterized in that a groove-shaped recessed part that recesses inward of the cylindrical part is provided at a portion connecting the rotation prevention hole. 2) At least a portion thereof has a cylindrical portion, and a detent hole is provided near the tip of the cylindrical portion, and the tip of the cylindrical portion of the cylindrical portion and the detent hole are connected. a caulking structure member provided with a groove-shaped recessed part that recesses inward of the cylindrical part; a fixed member having a fixing hole from which a fitting projection protrudes in part; the cylinder; a pressing surface wider than the inner periphery of the cylindrical portion; an inner periphery protection portion that protrudes from the pressing surface and has an outer portion approximately equal in size to the inner periphery of the cylindrical portion; and a distal end side of the inner periphery protection portion. and a mold having a slope portion continuous to the slanted portion, and the crimping structure is arranged such that the fitting protrusion of the fixed member is fitted into the detent hole through the recessed portion of the crimping structure member. The cylindrical portion of the member is inserted into the fixing hole of the member to be fixed, and in this state, the mold is moved toward the caulking structure member, so that the slope portion and the inner circumferential protection portion are The cylindrical portion is inserted into the cylindrical portion, and the slope portion pushes back the depressed portion outwardly, and the inner periphery protection portion is opposed to the inner periphery of the cylindrical portion, and the pressing surface is used to pivot the cylindrical portion. 1. A method for caulking a caulking structural member, characterized in that the member to be fixed is caulked by pressing in the direction of the cylindrical portion, thereby folding and deforming the circumferential wall on the distal end side of the cylindrical portion into a U-shaped longitudinal section. 3) A male die having a depression forming part, a hole punching part adjacent to the depression forming part and protruding from the depression forming part, a groove corresponding to the depression forming part, and the hole punching part. A female mold having a corresponding punched hole is prepared, and a detent hole is formed by punching out the vicinity of the tip of the cylindrical part of the material using a combination of the hole punched part of the male mold and the punched hole of the female mold. At the same time, the portion of the cylindrical portion connecting the tip of the cylindrical portion and the detent hole is formed into the cylindrical shape by the combination of the depressed portion forming portion of the male mold and the groove portion of the female mold. 1. A method for manufacturing a caulking structural member, comprising: recessing the portion inward to form a groove-shaped recessed portion in the portion.