JP2646423B2 - Driving simultaneous caulking fitting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simultaneous staking metal fitting for a thin steel material and a method for manufacturing the same, and more particularly, to a simultaneous simultaneous staking metal fitting for simultaneously performing a driving and caulking on a thin steel material, which is generated when the staking is performed. The present invention relates to a simultaneous punching and caulking metal fitting for preventing falling off of a punching waste and a method for manufacturing the same.

[0002]

2. Description of the Related Art At the present time, a so-called simultaneous simultaneous caulking fitting is often used for joining several steel sheets or attaching bolts or the like to the steel sheets. The driving simultaneous caulking metal fitting is to strike the head of the metal fitting to punch a thin steel material with the impact force, and to caulk and fix the protruding portion at the opposite side with a caulking metal mold.
The simultaneous driving caulking fitting is composed of a head and a hollow cylindrical body extending therefrom. Usually, two types of driving rivets for caulking a thin steel material and a driving bolt having a function of connecting the thin steel material to other members. There is.

[0003] The former comprises a head and a hollow cylindrical portion having a smaller diameter than that of the head, and is mainly used for stacking several thin steel materials and joining them together. The latter is composed of a head having a connecting portion to other members and a hollow cylindrical portion having a smaller diameter than that of the head, and the connecting portion is provided with connecting means such as screws, for connecting bolts attached to a thin steel material. Other members can be attached to the part.

Attachment of these simultaneous swaging metal fittings to a thin steel material is usually carried out using a stem for driving the metal fittings and a lower mold for performing an induction fringing action on the hollow cylindrical portion. .

In brief, the operation is as follows. First, the thin steel material is supported on a lower mold having an annular recess, and the hollow portion of the hollow cylindrical portion of the metal fitting is coaxially mounted on the annular recess of the lower mold. It is installed so that it becomes.

[0006] Next, the head of the metal fitting is hit with a stem or the like, and is pushed toward the lower metal mold, thereby punching scum from the thin steel material between the outer peripheral edge of the top of the curl mold and the inner peripheral edge of the hollow cylindrical part of the metal fitting. After being cut off and punched, a portion of the thin steel material adjacent to the hole after the punched scum is punched is pressed into the annular concave portion of the lower mold, and the hollow engaged with the portion of the thin steel material pressed into the annular concave portion. The free end of the cylindrical portion is bent outward in the radial direction to form a hook shape.

[0007] The press-contact portion of the head of the metal fitting is pressed against the opposing surface of the sheet steel, and the pressed-in portion of the sheet steel is moved between the press-contact surface of the head and the curled free end of the hollow cylindrical body. Compress,
Tighten between them. At this time, the punched scum punched from the thin steel material is pushed into the inner peripheral surface of the hollow cylindrical body, and finally enters the hollow portion of the cylindrical body.

However, as a major problem, since the inner peripheral surface of the hollow portion of the cylindrical body is straight from the free end to the back, punched stubs fitted into the back of the hollow portion may fall off due to some vibration or impact. There are many. The punched waste that has fallen off may bite into the line device, and may even cause a trouble that the automatic caulking line stops. Also, in electrical products and electrical components, the fall-off spills may cause the product to have troubles such as electric short-circuits and abnormal noise. For this reason, attempts have been made to make the hollow portion into a reverse taper or to provide a concave portion for fitting a punched waste into the hollow portion, but the processing is complicated and troublesome, and buckling occurs at the time of driving, Is easy to occur.

[0009]

SUMMARY OF THE INVENTION The present invention is intended to solve the above problems. That is, an object of the present invention is to provide a metal fitting for simultaneous caulking which can surely prevent the removal of the punching waste generated when caulking at the time of driving, and a simple manufacturing method of the metal fitting.

[0010]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies in order to solve such a technical problem, and as a result, a simple processing has been performed on the inner peripheral surface of the hollow cylindrical body. It has been found that the application of this method makes it possible to prevent the punched waste from coming off, and based on this finding, the present invention has been completed.

That is, according to the present invention, in a driving simultaneous swaging metal fitting having a head portion and a hollow cylindrical portion having a diameter smaller than the head portion, a projecting portion for preventing a punching spill from falling off is formed on an inner peripheral surface of the hollow cylindrical body. It exists in the provided simultaneous caulking fitting. And it exists in the simultaneous driving and swaging metal fitting whose head has a connection part with another member. In addition, there is a driving simultaneous caulking fitting in which the projection is a circumferential projection. Further, the protrusion exists in the simultaneous driving and swaging metal fitting, which is an isolated protrusion.

[0012] Further, the head of a simultaneous driving and swaging metal fitting comprising a head and a hollow cylindrical portion having a smaller diameter than the head is fixed.
Then, from the free end side of the hollow cylindrical portion, an ironing tool having a diameter slightly larger than the inner diameter of the hollow cylindrical portion is press-fitted toward the head side, and a driving simultaneous caulking metal fitting for forming a projection on the inner peripheral surface. In the manufacturing method.

[0013]

[Function] Since the simultaneous swaging metal fitting is constructed as described above, the function is as follows. When a striking force is applied to the head of the metal fitting at the same time as the driving, the tip of the hollow cylindrical portion punches a thin steel material. The punched scum of the punched steel material is pressed by the lower mold and pressed in along the inner peripheral portion of the hollow cylindrical portion. The hollow cylindrical portion is swaged in such a manner that it spreads along the radius surface of the lower mold and encloses a thin steel material. At this time, the punched waste passes over the projection formed on the inner peripheral surface of the hollow portion of the hollow cylindrical portion while being overcome by being elastically contracted and contracted. Return to At the end of the caulking, the punched waste fits deep into the hollow portion and is securely fixed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The specific structure of the present invention will be described below in detail with reference to the illustrated embodiment. FIG. 1A shows an example of a driving bolt. The driving bolt has a head and a hollow cylindrical portion having a slightly smaller diameter. The hollow cylindrical part is a hollow part whose inside is open to the outside,
A projection G is provided on the inner peripheral surface of the hollow portion, and the back is a conical bottom.

The projecting portion G is formed in a shape provided around the entire inner peripheral surface (referred to as "circumferential projection").
The punched waste is prevented from falling off by being fitted between the bottom and the circumferential projection. The cross-sectional shape of the circumferential projection may be triangular, trapezoidal, semi-circular, or the like, but a triangular shape is particularly preferable. As will be described later, this protrusion G is formed by pressing an ironing tool, which is a mold tool, by pressing.
Various shapes can be obtained by selecting the ironing tools having different tip shapes.

FIG. 2 shows an example in which the inner peripheral portion of the hollow cylindrical portion is provided in an isolated manner in the circumferential direction (referred to as an “isolated projection”). The cross-sectional shape of the isolated projection may be triangular, trapezoidal, semicircular, or the like, and the triangular shape is also preferable. The position where the protrusion is formed can be freely selected at the time of machining by adjusting the insertion distance of the ironing tool which is a mold tool as described later, so that the position in the axial direction on the inner peripheral surface of the hollow cylindrical portion can be selected. Driving bolts with different projections are easily manufactured. Therefore, it is only necessary to use a driving bolt having an optimum position of the projection according to the thickness of the thin steel material to be punched, that is, the thickness of the punching waste.

Since the free end of the hollow cylindrical portion forms an inner peripheral edge continuous with the end and the inner peripheral surface, a thin steel material can be punched out by a cooperative action with a lower mold as described later. The head is provided with a connecting portion engraved with a screw for coupling with another member, but when the connecting portion is not provided as shown in FIG. 1B, it is called a driving rivet. I have.

A series of steps in which a driving bolt punches a thin steel material by a striking force and caulks will be described in the order. First, a mold for simultaneously driving and setting the driving bolt will be described. In order to set the driving bolt at the same time as the driving, a stem A for applying a striking force and a lower die D for inducing a swaging operation are provided. use.

The stem A is for pressing the driving bolt toward the lower mold D, and has a hollow portion 5 into which the connecting portion 1 of the bolt can be inserted. Lower mold D is stem A
Is formed by caulking while deforming the driving bolt in cooperation with the lowering of the shaft. The curling mold 14 and the outer ring 13 surrounding the outer periphery of the curl mold 14 are integrated with each other by tightening. The curl mold 14 has a frusto-conical shape at the top, and has a flat top surface 11 and an annular surface which is continuous with the flat top surface 11.
Is formed. Top surface 11 of curl mold 14 and outer ring 1
3 has a slightly lower top surface 11 (approximately 0.8 to
(There is a gap of about 1.0 mm). The diameter of the outer peripheral edge 10 of the top surface 11 is substantially larger than the outer diameter of the driving bolt.

Next, the mounting operation of the driving bolt to the thin steel material will be described below in order with reference to FIGS.

FIG . 3 First, a thin steel material C is placed on a lower mold D comprising an outer ring 13 and a curl mold 14. At this time, the thin steel material keeps a slight gap from the top surface due to a drop between the upper surface of the outer ring and the top surface 11 of the curl mold. First, by using a catcher (not shown), the driving bolt is applied to the thin steel material C placed on the lower mold D in advance, and the stem A arranged coaxially with the lower mold D is hit and lowered. The lower end thereof is pressed against the flange of the head 2, the bolt is pushed down, and the end face is pressed against the steel sheet.

4 and 5 When the stem A is lowered, the thin steel material is pushed and stretched by the tip face of the driving bolt, and the top surface 1 of the curl mold 14 is lowered .
It is pressed against 1. When the stem A is further pushed down, the thin steel material C at that portion is stretched by the shearing force between the outer peripheral edge 10 of the curl mold 14 and the inner peripheral edge 7 of the driving bolt.

FIG . 6 When the stem A is further lowered, the thin steel material C is stretched and finally cut off from the thin steel material as a punch C1 to be punched.

As the stem A descends as shown in FIG . 7 , the hollow cylindrical portion 3 of the driving bolt and the thin steel material C spread and curl along the radius surface of the curl mold 14. At this time, the punched waste C1
Is press-fitted along the inner peripheral surface 9 of the hollow cylindrical portion 3, but when passing over the hard projection G, it passes over it while being elastically contracted and contracted. Spread to dimensions.

FIG. 8 abutment comes to the hollow cylindrical portion 3 to reach into a thin steel C is the head 2 is caulked in a manner involving thin steel C, this time scrap C1 is Mari included fit the back of the hollow portion It is fixed, and a series of mounting operations ends.

Next, an example in which the lower die D is modified to more accurately attach the driving bolt to the thin steel material C will be described. FIGS. 9 to 14 show the operation of attaching the driving bolt to the thin steel material C when using the curl mold 14 having the stepped portion H on the top surface 11 thereof. The punched waste C1 is cut off from the thin steel material C (FIG. 1).
2) Press-fit along the inner peripheral surface 9 of the hollow cylindrical portion 3,
At this time, the projecting portion G of the driving bolt can be released at the step portion H, and the punched residue C1 can be pushed into the top surface 11 of the curl mold 14 without being disturbed by the projecting portion G (FIG. 13). , FIG. 14). The size of the step H can be freely determined as long as it is not hindered by the protrusion G of the driving bolt.

Next, a method of manufacturing a metal fitting for simultaneous swaging according to the present invention (FIG. 15) will be described. First, the fitting is fixed with a tool such as a die to a metal fitting for simultaneous driving and caulking consisting of the head 2 and the hollow cylindrical portion 3. afterwards,
An ironing tool F having a diameter slightly larger than the inner diameter of the hollow cylindrical part 3 is pressed into the head side from the free end side of the hollow cylindrical part 3. The ironing tool F advances while squeezing the inner peripheral surface 9 of the cylindrical portion at its tip, and forms a projection G at a position where the ironing tool F stops.

The formed projections G become extremely hard due to work hardening. Therefore, when the punched swarf C1 gets over the hollow and goes into the interior of the hollow part 5, it is not crushed. And get over it. Therefore, the punching waste C1 once entered is securely fixed by the projection G and does not fall off. As a result, a protrusion G for preventing the punched waste C1 from dropping off can be formed on the inner peripheral surface 9 of the hollow cylindrical body 3 of the simultaneous swaging metal fitting, and the simultaneous swaging metal fitting is completed.

While the present invention has been described, various other modifications are possible without departing from the essence of the invention. For example, various shapes are adopted for the shape of the head of the simultaneous swaging metal fitting of the present invention, such as a square, a round, and a female screw, a stud, and the like.
Needless to say, it can be freely deformed.

[0030]

As described above, according to the present invention, since the hollow cylindrical portion has the protruding portion on the inner peripheral surface, it is possible to reliably prevent the punching waste generated at the time of caulking from falling off. Therefore, the line of the punched waste is not caught in the apparatus, and there is no trouble in stopping the automatic caulking line. Further, even if the thin steel material is a relatively soft material, the protrusions can sufficiently guarantee the pressing force of the punched waste, so that a metal fitting of any material can be attached. On the other hand, since the protrusion can be freely formed at an appropriate position easily by using the press-fitting and ironing action of the ironing tool, the manufacture of the simultaneous caulking metal fitting becomes extremely simple and efficient.

[Brief description of the drawings]

FIG. 1A is a perspective view of a driving bolt according to a first embodiment of the present invention. FIG. 1B is a perspective view of a driving rivet according to a second embodiment of the present invention.

FIG. 2 is a view showing a driving bolt having an isolated projection.

FIG. 3 is a diagram showing a simultaneous swaging operation.

FIG. 4 is a diagram showing a simultaneous swaging operation.

FIG. 5 is a diagram showing a simultaneous driving and swaging operation.

FIG. 6 is a diagram illustrating a simultaneous swaging operation.

FIG. 7 is a diagram showing a simultaneous swaging operation.

FIG. 8 is a diagram showing a simultaneous swaging operation.

FIG. 9 is a diagram illustrating a simultaneous swaging operation.

FIG. 10 is a diagram showing a simultaneous swaging operation.

FIG. 11 is a diagram showing a simultaneous swaging operation.

FIG. 12 is a view showing a simultaneous driving and swaging operation.

FIG. 13 is a view showing a simultaneous driving and swaging operation.

FIG. 14 is a diagram illustrating a simultaneous swaging operation.

FIG. 15 is a view showing a method of manufacturing a simultaneous driving and swaging metal fitting according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Connection part 2 Head part 3 Hollow cylindrical part 4 Press-contact part 5 Hollow part 6 Bottom part 7 Inner peripheral edge 8 Tip surface 9 Inner peripheral part 10 Outer peripheral edge 11 Top surface 12 Annular concave part 13 Outer ring 14 Curl mold 15 Round surface A stem B driving Bolt C Sheet steel C1 Punching waste D Lower die E Chuck F Ironing tool G Projection H Step

Claims (5)

(57) [Claims] 1. A simultaneous driving and swaging device comprising a head and a hollow cylindrical portion having a diameter smaller than that of the head, wherein a projection for preventing punched scum from falling off is provided on an inner peripheral surface of the hollow cylindrical body. Driving simultaneous caulking metal fittings. 2. The simultaneous simultaneous swaging metal fitting according to claim 1, wherein the head has a connecting portion with another member. 3. The simultaneous swaging metal fitting according to claim 1, wherein the projection is a circumferential projection. 4. The simultaneous simultaneous swaging metal fitting according to claim 1, wherein the projection is an isolated projection. 5. A simultaneous driving and caulking metal fitting comprising a head and a hollow cylindrical portion having a diameter smaller than that of the head, first fixing the simultaneous driving and caulking metal fitting, and thereafter, from the free end side of the hollow cylindrical portion, the hollow cylinder A method for manufacturing a metal fitting for simultaneous swaging, characterized in that an ironing tool having a diameter slightly larger than the inner diameter of the part is press-fitted toward the head side and a projection is formed on the inner peripheral surface.