JPH06114469A - Method and device for fixing joiner to metallic sheet - Google Patents

Abstract

PURPOSE:To enable fixing a joiner to a metallic sheet to secure fixing and to facilitate fixing operation by setting a size of pressing die by which a hole for fixing the joiner to the metallic sheet is punched. CONSTITUTION:When the size of a nut formed with recessed grooves 1a on opposing side faces is X and the size of the clearance between a punch and a die of the pressing die is C, the size of the punch is X-C, the size of the die is X+C, the size of the hole 2a of the metallic sheet 2 is X-C on the punch side and X+C in a taper shape on the die side, after the nut 1 is inserted in the hole by pressing, the outer circumference of the recessed grooves 1a is collapsed by a wedge shaped punch D and the hole 2a part is allowed to gnaw in the recessed grooves 1a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a fastening for fixing a fastener such as a bolt or a nut to a metal plate such as an iron plate or a brass plate so that the fastener does not rotate and does not fall out. TECHNICAL FIELD The present invention relates to a method for fixing a tool to a metal plate and a fixing device.

[0002]

2. Description of the Related Art Conventionally, as a fixing method for fixing fasteners such as bolts and nuts to a metal plate, holes having a diameter equal to or larger than those of screws such as bolts and nuts are drilled, and screw holes for the nuts are formed in the holes. The most common method is to spot weld the nut, the bolt head and the metal plate after aligning or inserting the screw part of the bolt.

However, according to this method, it is difficult to manage spot welding for complete welding due to the difference in heat capacity between the metal plate and the bolts, nuts, etc., and the management is troublesome. There was a possibility of peeling and peeling.

In order to solve such a problem, many means have been proposed, for example, a press product with a nut and a method therefor described in JP-A-61-2202731.
In this method, a polygonal nut is used as a punch, a die facing the polygonal nut is provided, a metal plate is inserted between the polygonal nut and the die, and one or more non-adjacent sides of the polygonal nut are used as cutting edges to form the die. Punching processing to form the part to be punched with
The other side, which is not punched, is squeezed by the die, and the process of providing a protrusion that connects the polygonal nut and the sheet metal from the sheet metal side is performed.

[0005]

However, all of these methods and means are special processing methods or processing devices,
However, there is a drawback in that the equipment cost is increased or many processing steps are required, which increases the product cost.

Further, when the fastener is such as a bolt or a nut to which a rotating force is applied, the resistance against this is insufficient and the fastener rotates with respect to the metal plate. There were also drawbacks such as a high risk of the fastener falling off from the metal plate.

The present invention solves the above-mentioned drawbacks of the conventional method and apparatus for fixing a fastener of this type to a metal plate, and does not require any special equipment or method, and is simple and reliable. An object of the present invention is to provide a fixing method and a fixing device capable of fixing a fastener to a metal plate.

[0008]

SUMMARY OF THE INVENTION The present invention is directed to a method of securing a fastener to a metal plate to achieve the foregoing objectives, which method comprises fixing the size of the die of a press drilled in the metal plate. The size of the punch is slightly smaller than the size of the fastener, and the hole formed in the metal plate has a minimum hole size smaller than the fastener size and a maximum size smaller than the fastener size. The fastener is characterized in that it has substantially the same tapered shape as the fastener, and the fastener is press-fitted into this hole.

The present invention is also a device for fixing a fastener to a metal plate by the above-mentioned method, and further, a recess groove to be located in the metal plate is provided on a side surface of the fastener. It is desirable to add to the fixing method a processing step in which the metal plate on the outer periphery of the fastener that has been formed and press-fitted into the metal plate is crushed, and a part of the metal plate is press-fitted into the recessed groove. Further, a fixing device that fixes the fastener to the metal plate in the above-described additional processing step is also desirable.

[0010]

In general, when punching a hole with a press, an optimum clearance is provided between the punch and the die of the press depending on the plate thickness.
Since the ratio of the fracture surface to the shear surface is changed, it is somewhat constant, but it is almost constant.

The hole punched out by such a press die has a punch size on the punch side of the metal plate and a die size on the die side, and the hole surface has a tapered shape corresponding to the clearance of the press die. It will be.

The method of fixing the fastener of the present invention to the metal plate is as follows.
Utilizing the properties of the press holes as described above, the press die that punches the metal plate that fixes the fastener into the shape of the fastener has a punch size smaller than the outer shape of the fastener and a die size By making the shape of the fastener approximately the same, the dimensions of the fastener can be accommodated within the taper of the removed hole.

By forming the hole of the metal plate for fixing the fastener as described above, the fastener is press-fit into the hole, whereby the fastener is tightened by the hole of the metal plate, and the fastener is fixed. To be done.

A groove is provided on the side surface of this fastener, and after the fastener is press-fitted into the hole of the metal plate as described above, the metal plate on the outer periphery of the fastener is crushed and processed. Let it bite into the above-mentioned recessed groove, and by this biting rotation of the fastener,
It is possible to further prevent the dropout.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, as an example of carrying out the present invention, the case of fixing a nut to a metal plate will be described below with reference to FIGS. In this case, assuming that the material of the metal plate 2 to which the hexagonal nut 1 is fixed is a cold-rolled steel plate and the thickness thereof is 2 mm, a punch A and a die B of a press die for punching the same.
The clearance C of 7 to 11% of the plate thickness is generally used.

Therefore, a large clearance C is 1
1% is adopted and this clearance C is 0.22mm
Reduce the dimension between the two faces of the punch by 1/2
The die increases the dimension between the two faces by 1/2.

Therefore, if the dimension between the two opposing surfaces of the nut 1 is X, the corresponding dimension of the punch A is
X-0.11mm, the corresponding size of die B is X + 0.11mm
However, it is desirable that the setting of the amount of the clearance C and the distribution amount of the clearance C between the punch A and the die B are optimized according to experience.

The hole of the metal plate 2 punched out by this press die is a tapered hole 2a of X-0.11 mm on the punch side and X + 0.11 mm on the die side. The side can be inserted, but the punch side cannot pass.

Therefore, when the nut 1 is press-fitted into the hole 2a, the hole 2a receives a force to expand it, and the nut 1 is squeezed by a resistance force against the hole 2a.
It is fixed to.

Horizontal recessed grooves 1a have been cut in the two facing surfaces of the nut 1, and the recessed grooves 1a are pressed into the holes 2a of the metal plate 2 as described above.
If a wedge-shaped punch D is driven into the metal plate 2 outside the recessed groove 1a, a wedge-shaped recess 2b of the metal plate 2 is formed, and the inner portion thereof is extruded toward the nut 1 and inside the recessed groove 1a. As a result, the nut 1 will not fall out of the hole of the metal plate 2.

In this embodiment, the nut 1 is attached to the metal plate 2.
When press-fitting, the metal plate 2 may warp,
When the punch D is driven, the warp of the metal plate 2 can be corrected if the punch D is provided with a surface for flattening the metal plate 2. Further, a tool for press-fitting the nut 1 into the metal plate 2 may be provided with a surface for correcting the warp.

Above, the nut 1 is the metal plate 2 as a fastener.
An example in which the bolt 3 is fixed to the metal plate 2 will be described below as the next example.

In this nut 3, the head portion of the cylindrical portion 3b having the threaded portion 3a is a hexagonal head portion 3c, and the two opposing surfaces of the hexagonal head portion 3c have the same depressions as in all the embodiments. Groove 3d
And a disk-shaped head 3e is provided on one surface of the hexagonal head 3c.

Then, a hexagonal head 3c is formed on the metal plate 2 in the same manner as the nut 1 of the previous embodiment, and a hexagonal hole for this is formed in the same size as the previous embodiment, and the bolt 3 is inserted in this hole. Of 6
The press-fitting and fixing of the corner 3c is the same as in the previous embodiment.

As a next embodiment, the case where the round bar 4 is fixed to the metal plate 2 will be described with reference to FIG. In this case,
The round bar 4 is formed with recessed grooves 4a at two opposing positions on the same circumference.

A hole for inserting the round bar 4 is formed in the metal plate 2 for fixing the round bar 4, and the diameter of the press-type punch A for forming the hole is the same as that of the round bar 4. When the diameter is X, with respect to the clearance C between the punch A and the die B,
Similar to the first embodiment, X-C is set, and the hole diameter of the die B is set to X + C as in the first embodiment, and the hole 2c is formed in the metal plate 2.

Then, the diameter of the hole 2c becomes a taper shape of X-C on the punch side and X + C on the die side, and after the round bar 4 is press-fit into the recessed groove 4a, the recessed groove 4a is formed. The outer metal plate 2 is crushed by forming a wedge-shaped recess 2b with a wedge-shaped punch D, and the bulge of the metal plate 2 due to its root is made to bite into the recessed groove 4a. This is to prevent the round bar 4 from coming off from the plate 2 and rotating when the rotary force is applied to the round bar 4.

[0028]

As described above, according to the present invention, when fixing fasteners such as nuts, bolts and round bars to a metal plate, holes are formed in the metal plate for inserting these fasteners. By setting the dimensions of the press-type punch and die as described above, the small diameter portion of the hole can be made smaller than the fastener and the large diameter portion of the hole can be made larger than the fastener.

Therefore, although the fastener can be easily inserted into the hole at the beginning, if the insertion is attempted to the end, it hits the small diameter portion, so press-fitting is necessary. By sandwiching the metal plate against this press-fitting. , The fastener is fixed, the outline of the fixing is determined by the size of the press die, and the fastener can be press-fitted into the hole punched by this press die, so the press-fitting work can be done easily and its fixing It is certain.

Then, a recessed groove is formed on the side surface of the fastener at the portion press-fitted into the metal plate, and after the fastener is pressed in, the metal plate on the outer periphery of the recessed groove is pressed to remove the metal plate at this portion. By making it bite into the recessed groove, it is possible to more reliably prevent the fastener from falling off and rotating.

[Brief description of drawings]

FIG. 1 is a perspective view of a hole portion of a nut and a metal plate when the present invention is applied to fix a nut.

FIG. 2 is a cross-sectional view of a press-type punch, a die, and a metal plate for punching the above holes.

3A and 3B are cross-sectional views showing a working state in which a nut is fixed to a metal plate.

FIG. 4 is a perspective view of a bolt according to a second embodiment of the present invention.

FIG. 5 is a cross-sectional view of a third embodiment of the present invention in a state where a round bar is fixed.

[Explanation of Codes] A Punch B Die C Clearance D Wedge-shaped Punch X Dimension of fastener 1 Nut 1a, 3a, 4a Ditch groove 2 Metal plate 2a Hole 2b Wedge-shaped dimple 2c Hole 3 Bolt 4 Round bar

Claims (4)

[Claims] 1. The size of a die of a press for punching a metal plate is substantially the same as the size of a fastener to be fixed, and the size of a punch is formed slightly smaller than the size of the fastener to form a metal plate. The method of fixing a fastener to a metal plate, characterized in that the formed hole has a taper shape in which the minimum dimension of the hole is smaller than that of the fastener and the maximum dimension thereof is substantially the same as that of the fastener, and the fastener is press-fitted into this hole. . 2. A taper for fastening a fastener formed in a metal plate has a minimum dimension slightly smaller than an outer shape of a fastener inserted therein, and a maximum dimension is substantially the same as an outer dimension of the fastener. An apparatus for fixing a fastener to a metal plate, characterized by forming a hole into which a fastener is press-fitted. 3. A recessed groove to be located in the metal plate is formed on a side surface of the fastener, and the metal plate around the periphery of the fastener press-fitted into the metal plate is crushed so that a part of the metal plate is recessed. The method for fixing a fastener to a metal plate according to claim 1, wherein the fastener is press-fitted into the groove. 4. A recessed groove located in the metal plate is formed on a side surface of the fastener, and a part of the metal plate on the outer periphery of the fastener press-fitted into the metal plate is press-fitted into the recessed groove. The device for fixing a fastener to a metal plate according to claim 2.