JPH0551375B2 - - Google Patents

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.

BACKGROUND ART Conventionally, for example, when fixing a nut to another member (hereinafter referred to as a mating member), the nut was generally arc welded or resistance welded to the mating 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 mating member are plated, the plated layer is destroyed by welding, so after welding, it is necessary to plate again to prevent rust, which also increases costs.

There were other problems.

Furthermore, in the past, similar problems sometimes occurred when fixing members other than nuts to a mating member.

OBJECT OF THE INVENTION The present invention was made to solve the above-mentioned conventional problems, and includes a caulking structural member that can be easily and firmly fixed to a mating member by caulking without welding, a caulking method thereof, and The purpose is to provide a manufacturing method thereof.

Means for Solving the Problems A caulking structure member according to the present invention has a cylindrical portion at least in part, and further includes a protrusion engagement hole provided in a peripheral wall of the cylindrical portion, and a cylindrical portion. The recessed portion is formed by recessing a portion of the peripheral wall between the tip of the cylindrical portion and the protrusion engaging hole toward the inside of the cylindrical portion.

Further, the method for caulking a caulking structural member according to the present invention includes a cylindrical part at least in part, and a protrusion engagement hole provided in a peripheral wall of the cylindrical part, and a protrusion engagement hole provided in a peripheral wall of the cylindrical part. A caulking structure member having a recessed part formed by recessing a portion between the tip of the cylindrical part and the protruding part engagement hole toward the inside of the cylindrical part, and a cylindrical part insertion hole. and a mating member having a protruding part that protrudes with respect to the cylindrical part insertion hole, the protruding part of the mating member passing through the recessed part of the caulking structure member and engaging with the protruding part. The cylindrical part of the caulking structure member is inserted into the cylindrical part insertion hole of the mating member so as to be engaged with the hole, and in this state, the cylindrical part is plastically deformed, thereby removing the cylindrical part. The mating member is caulked at the part.

Furthermore, the method for manufacturing a caulking structural member according to the present invention includes: a male mold having a recessed part forming part, a hole punching part adjacent to the recessed part forming part and protruding from the recessed part forming part, and the recessed part forming part. A female mold having a groove portion corresponding to the hole punching portion and a punching hole corresponding to the hole punching portion is prepared, and a peripheral wall of the cylindrical portion of the material is connected to the hole punching portion of the male mold and the punching hole of the female mold. A combination of punching is performed to form a protrusion engaging hole in the peripheral wall, and a combination of the depressed part forming part of the male mold and the groove part of the female mold is used to form a protrusion engaging hole in the cylindrical part of the cylindrical part. A portion between the tip and the protrusion engaging hole is depressed toward the inside of the cylindrical portion to form a depressed portion in the portion.

Effect In the present invention, the protruding portion of the mating member is engaged with the protruding portion engagement hole of the caulking structural member, so that the caulking structural member is positioned with respect to the mating member in the axial direction, and the caulking structural member is positioned relative to the mating member in the axial direction. (However, if the cylindrical part and the cylindrical part insertion hole are non-circular, even if they are fitted together, the caulking structural member and the mating member will not be able to rotate.) (relatively unrotatable). By plastically deforming the cylindrical part and crimping the mating member, the cylindrical part cannot move in the direction of coming out of the cylindrical part insertion hole. It also becomes relatively impossible to move in any direction. Therefore, the caulking structural member is completely fixed to the mating member.

Embodiments Hereinafter, the present invention will be described based on embodiments shown in the drawings.

1 to 3 show an embodiment in which the present invention is applied to a nut, in which a metal nut 1 is integrally provided with a cylindrical portion 2. As shown in FIG. This cylindrical portion 2 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 protrusion engagement hole 4 is provided in the peripheral wall of the cylindrical portion 2 . Further, a portion of the peripheral wall of the cylindrical portion 2 between the tip of the cylindrical portion 2 and the protrusion engaging hole 4 and a portion around the circumferential wall are depressed toward the inside of the cylindrical portion 2. A groove-shaped depressed portion 5 is formed.

FIG. 4 shows an example of a mating member to which the nut 1 is to be fixed. The mating member 6 is plate-shaped and provided with a cylindrical part insertion hole 7. This cylindrical part insertion hole 7 has a generally circular shape with a diameter slightly larger than the outer diameter of the cylindrical part 2 of the nut 1, but a part of the cylindrical part insertion hole 7 has a circular shape with a diameter slightly larger than the outer diameter of the cylindrical part 2 of the nut 1.
A protruding portion 8 is protruded from the cylindrical portion insertion hole 7 toward the center thereof. The protrusion 8 has a size corresponding to the protrusion engagement hole 4.

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

First, to explain the press mold used for this fixing work, as shown in Figures 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. On the other hand, the upper mold 10 includes a main body 11 and a protrusion member 12 screwed into the lower part of the main body 11 in the axial direction, and the lower end side of the protrusion member 12 protrudes below the main body 11. ing. 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. have. A tapered slope portion 12a is formed at the lowermost end of the protruding member 12. Further, the protruding member 12 has an inner peripheral protection portion 12b having an outer diameter slightly smaller than the inner diameter of the cylindrical portion 2.
It is formed continuously on the upper part of the slope part 12a.

To fix the nut 1 to the mating member 6, first,
As shown in FIGS. 5 and 6, the cylindrical portion 2 of the nut 1 is connected to the mating member 6 so that the protruding portion 8 passes through the recessed portion 5 of the nut 1 and is engaged with the protruding portion engaging hole 4.
It is inserted into the cylindrical part insertion hole 7 of. As a result, the nut 1 cannot rotate relative to the mating member 6 and cannot move upward or downward in the figure. And, in this state, Natsu 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. Note that at this time, the main body 11 of the upper mold 10
The axis of the protruding member 12 is made to coincide with the axis of the nut 1.

Next, when the upper mold 10 is lowered in this state, the slope part 12a first becomes the cylindrical part 2 as shown in FIG.
The slope portion 12a comes into contact with the back side of the recessed portion 5, and pushes the recessed portion 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 is at the midpoint in the axial direction of the peripheral wall, as shown in FIG. Vertical section U so that the part protrudes outward.
It is folded and deformed into a letter shape.

As a result, the mating member 6 is crimped by the tip of the cylindrical portion 2 (FIG. 10 shows a bottom view of the nut 1 after such crimping work is completed), and the nut 1 is Not only cannot it rotate relative to the mating member 6, but it also cannot move in the axial direction. Therefore, the nut 1 is completely fixed to the mating member 6.

As described above, according to the present invention, the nut 1 can be fixed to the mating member 6 by caulking work without using welding, so that the cost of the fixing work can be reduced.

Furthermore, according to the present invention, if pre-plated members are used as the mating member 6 and the nut 1 (for example, if a plated steel plate is used as the mating member 6), the plating layer will be destroyed by welding as in the conventional case. Therefore, there is no need to re-plate the nut 1 after fixing it to the mating member 6, and rust prevention can be achieved in the same state, so costs can be reduced in this aspect as well.

In addition, in this embodiment, the cylindrical portion 2 is deformed by being inserted through the inner peripheral protection portion 12b of the mold 10, so that the cylindrical portion 2 is inserted into the screw hole 3 by the caulking operation. A bolt or screw (not shown) that is deformed further inward and is screwed into the screw hole 3
There will be no inconvenience such as bumping into the cylindrical portion 2.

Further, in this embodiment, the circumferential wall of the cylindrical portion 2 is folded back and deformed, and the circumferential wall of the cylindrical portion 2 is doubled in this deformed portion, 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 portion 2 instead of the protrusion engaging hole 4 and the recessed portion 5 in the present invention. The presence of the notch makes the tip discontinuous and the caulking strength decreases, but in the case of the present invention, the tip of the cylindrical portion 2 is continuous in the circumferential direction due to the depression 5, so the above-mentioned inconvenience occurs. Not at all.

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 protruding part engaging hole 4 and the recessed part 5 of the cylindrical part 2. At this stage of the raw material 1', the cylindrical part 2 is completely It has a cylindrical shape.

12 to 16 show a press mold for manufacturing the nut 1. FIG. To explain this,
A lift guide 17 is fixed to the base 16, and a female support 18 is attached to the lift guide 17.
is fitted above a stopper table 26 fixed to the base 16 so as to be movable up and down. Said base 1
A compression coil spring 19 (see FIG. 14) is interposed between 6 and the female support 18, and this spring 19 urges the female support 18 upward.

A generally rod-shaped female die 20 is fixed to the female die support 18 in the horizontal direction. Said female mold 20
A screw hole fitting part 21 is provided at the tip of the material 1' to fit into the screw hole 3 of the material 1'. Further, the female die 20 is provided with a cylindrical part fitting part 22 adjacent to the screw hole fitting part 21 into which the cylindrical part 2 of the material 1' is fitted. A punched hole 23 passes through the joint portion 22 in the vertical direction. Further, the female die 22 is provided with an intermediate portion 24 having a diameter larger than the inner diameter of the cylindrical portion 2 adjacent to the cylindrical portion fitting portion 22 . 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 female die 20. At both ends of the stopper stand 26, screw hole fitting parts 21 of the female mold 20 are sandwiched at regular intervals,
A material rotation preventing member 27 is fixed.

The male mold 30 used in this example is shown in FIG.
This is shown in Figures 16 and 17, etc. This male type 3
0 has a main body 31 and a processing member 32 fixed to the main body 31, and the lower end of the processing member 32 projects downward from a recess 33 formed in the lower end of the main body 31. Then, the processing member 32
A linear depression forming part 34 and a hole punching part 35 protruding further downward from the depression part 34 are formed at the lower end of the plate.

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

First, as shown in FIG. 17, the cylindrical part 2 and screw hole 3 of the material 1' are fitted into the cylindrical part fitting part 22 and screw hole fitting part 21 of the female die 20, 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 hole punching part 35 comes into contact with the cylindrical part 2, and the material 1' is lowered together with the female mold 20 and the female mold support 18 against the spring 19. . 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 from then on, as shown in FIG.
enters the punched hole 23 of the female die 20, punches out the peripheral wall of the cylindrical portion 2, and forms the protrusion engaging hole 4.
, 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 make it depression, thereby forming the depression 5.

In this embodiment, the punching of the protruding part engaging hole 4 and the formation of the recessed part 5 are performed with the female die 20 supported by the stopper stand 26, so that an excessive force is applied to the female die 20 and the female die is Inconveniences such as breakage of the 20 can be avoided.

However, the nut 1 to be processed is large and the female die 2
If the thickness of 0 can be made thicker, it is also possible to perform the above-mentioned pressing process by fixing the female die 20 without being able to raise and lower it and not supporting it from below with something like the stopper stand 26. It is.

FIG. 21 shows another embodiment of the nut according to the invention. In the embodiment described above, one nut 1 was provided with only one protrusion engagement hole 4 and one recessed part 5, but in this embodiment, one nut 1 was provided with two protrusion engagement holes 4. and the depressed portion 5, respectively, to each other.
It is placed at a 180 degree angle. Here, each of the two protruding part engaging holes 4 and the recessed part 5 may be machined one by one one by one, for example, by the method described in the above embodiment, or the two male molds may be formed into a cylindrical shape from both sides at the same time. Part 2
By advancing toward , two protrusion engaging holes 4 and two depressions 5 may be processed simultaneously.

As in this embodiment, when a plurality of protrusion engagement holes 4 and recessed parts 5 are provided in one nut 1, the same number of protrusions are provided in the mating member, and each of these protrusions is It can be fitted into the protrusion engagement hole 4.

From FIG. 22 to FIG. 24, the above-mentioned FIG.
An embodiment of a mold for caulking a nut 1 having two protrusion engagement holes 4 and two depressions 5 is shown.
In this embodiment, the workpiece 1 of the upper mold 10 is
At the bottom end of 2, there are 2
Planar slope portions 12c are provided. Further, the slope portion 1 of the lower end portion of the processing member 12
A curved slope portion 12d is provided in a portion other than 2c. 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 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. The depressed portion 5 of is pushed back to the outside.

In addition, although the examples so far have shown cases in which the caulking structural member according to the present invention is applied to a nut,
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.

Furthermore, although only a portion of the nut 1 in the embodiments described above is cylindrical, the entire caulking structure member of the present invention may be cylindrical.

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

To explain this, two protrusion engagement holes 44 are provided near the tip of the metal square pipe 43 at positions that are 180 degrees apart from each other. The portion between the protrusion engaging hole 44 and the tip of the square pipe 43 and the surrounding portion are depressed inward to form a groove-like depressed portion 45 . These protrusion engaging 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, respectively, for caulking the square pipe 43. The upper mold 47 includes a main body 48 and a protruding member 49. The bottom surface of the main body 48 constitutes a pressing surface 48a, and this pressing surface 48a is connected to the square pipe 43.
It has a sufficiently wider area than the inner circumference of. 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 bolt 50. At the lower end of the protruding member 49, planar slope portions 49a are provided at positions that are 180 degrees apart from each other. Further, the protruding member 49 has an inner circumferential protection portion 49b having approximately the same cross-sectional shape as the inner circumferential portion of the square pipe 43.
is provided continuously on the upper part of the slope portion 49a.

In this embodiment as well, the mating member 51 includes a rectangular cylindrical part insertion hole corresponding to the square pipe 43 and a protrusion that protrudes from the cylindrical part insertion hole and is engaged with the protrusion engagement hole 44. By providing this, it is possible to caulk the mating member 51 at the tip of the square pipe 43 in the same manner as in each of the embodiments described above.

In addition, when the cylindrical part and the cylindrical part insertion hole are non-circular as in the case of this embodiment, only the protruding part of the mating member is engaged with the protruding part engagement hole of the caulking structure member. Moreover, even when the cylindrical part and the cylindrical part insertion hole are fitted into each other, the caulking structure member and the mating member become relatively unrotatable.

FIG. 28 shows yet another embodiment of the invention.
In this embodiment as well, the square pipe 43 has two protrusion engaging holes 4 at positions 180 degrees apart from each other.
4 and a groove-shaped depression 45 are provided,
Two protruding engagement holes 44 from the tip of the square pipe 43
The distances to the two depressions 45 are different, and therefore the lengths of the two depressions 45 are also different.

Therefore, the two protrusions 52 provided on the mating member 60 are respectively fitted into the protrusion engagement holes 44,
If the caulking work is performed in the same manner as in each of the embodiments described above, the mating member 60 can be fixed diagonally to the square pipe 43 (FIG. 28 shows the state before the caulking work). And such a structure is
For example, it can be applied to handrails of stairs.

Effects of the Invention As described above, the present invention has the following advantages: (a) A caulking structural member can be easily fixed to a mating member by caulking work without welding, so that the cost of the fixing work can be reduced.

(b) If pre-plated members are used as the caulking structural member and the mating member, the plating layer will not be destroyed by welding, so after fixing the caulking structural member to the mating member, There is no need to re-patch, and rust prevention can be achieved in the same state.

(c) Since the tip of the cylindrical portion is continuous in the circumferential direction by the recessed portion, the caulking strength can be increased.

It is possible to obtain excellent effects such as.

[Brief explanation of the drawing]

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 the mating member to which the nut is fixed, FIG. 5 is a bottom view showing a state in which the nut and the mating member 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, and FIG. 12 is a process diagram showing an example of the caulking work. A plan view showing a mold (excluding the male mold) for processing the nut, FIG. 13 is a front view showing the mold, and FIG. 14 is taken along A-A in FIG. 12.
15 is a front view showing a male die for processing the nut, FIG. 16 is a rear view of the male die, and FIGS. 17 to 20 are steps for processing the nut. FIG. 21 is a cross-sectional view showing a nut which is another embodiment of the caulking structural member according to the present invention, FIG. 22 is a cross-sectional view showing the caulking operation of the nut, and FIG. Bottom view showing the upper mold, Figure 24 is B-B in Figure 23
25 is a sectional view showing still another embodiment of a caulking structural member according to the present invention and a mold for caulking the caulking structural member, and FIG. 26 is a cross-sectional view taken along line C-C in FIG. 25. Arrow view, Fig. 27 is Fig. 25
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 engaging hole, 5... Recessed part, 6... Mating member, 7... Cylindrical part insertion hole, 8... Protrusion, 10
. . . Upper mold, 11a .
... punching hole, 25 ... groove, 30 ... male mold,
34... Depression forming part, 35... Hole punching part,
43... Square pipe, 44... Projection engagement hole, 45
... Depression part, 48a ... Pressing surface, 49a ... Slope part, 49b ... Inner periphery protection part, 51 ... Mating member,
52...Protrusion part, 60...Mating member.

Claims (1)

[Scope of Claims] 1 At least a portion thereof has a cylindrical portion, and further includes a protrusion engaging hole provided in a peripheral wall of the cylindrical portion, and the cylindrical portion of the peripheral wall of the cylindrical portion. and a recessed part formed by recessing a portion between the tip of the cylindrical part and the protrusion engaging hole toward the inside of the cylindrical part. 2. At least a portion thereof has a cylindrical portion, and further includes a protrusion engaging hole provided in a peripheral wall of the cylindrical portion, a tip of the cylindrical portion of the peripheral wall of the cylindrical portion, and the protrusion. a caulking structure member having a recessed part formed by recessing a portion between the engagement hole and the cylindrical part toward the inside of the cylindrical part; a cylindrical part insertion hole; and a mating member having a protruding part, and the caulking structural member is arranged such that the protruding part of the mating member passes through the recessed part of the caulking structural member and is engaged with the protruding part engagement hole. The cylindrical part is inserted into the cylindrical part insertion hole of the mating member, and in this state, the cylindrical part is plastically deformed to caulk the mating member with the cylindrical part. A method for caulking structural members. 3. a pressing surface wider than the inner periphery of the cylindrical portion; and 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 including a sloped portion continuous to the tip side of the inner peripheral protection portion is prepared, and the protruding portion of the mating member passes through the recessed portion of the caulking structure member and enters the protruding portion engagement hole. Inserting the cylindrical part of the caulking structural member into the cylindrical part insertion hole of the mating member so as to be engaged, and in this state, moving the mold toward the caulking structural member, The slope portion and the inner periphery protection portion are 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. , by pressing the cylindrical part in the axial direction with the pressing surface, thereby folding and deforming the peripheral wall of the cylindrical part so that the intermediate part of the peripheral wall in the axial direction protrudes outward, thereby A method for caulking a caulking structural member according to claim 2, characterized in that the member is caulked. 4. A male mold 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 a hole punching part in the hole punching part. A female mold having corresponding punched holes is prepared, and a peripheral wall of a cylindrical portion of the material is punched out using a combination of the hole punched portion of the male mold and the punched hole of the female mold, and a protrusion engages with the peripheral wall. At the same time, a hole is formed between the tip of the cylindrical part of the cylindrical part and the protrusion engaging hole by the combination of the depressed part forming part of the male mold and the groove part of the female mold. A method for manufacturing a caulking structural member, comprising: recessing a portion toward the inside of the cylindrical portion to form a recessed portion in the portion.