JPH06277887A - Positioning tool for depositing nut and its method - Google Patents

Abstract

PURPOSE:To position by inserting from the depositing surface of the nut of a plate, and to shorten an operation time by mounting and demounting the nut with a single operation. CONSTITUTION:A guide pin 1 is equipped with a ball-head part 1a whose one end part is divided into two in the shaft direction with a slit groove 1c, and a shaft part 1b. A nut 4 is inserted into this shaft part 1b to hold it, the ball- head part 1a is force-fitted into the inner diameter part 3a of a holding ring 3, and the nut 4 and the holding ring are held. Next, the holding ring 3 is inserted into the mounting hole 5a of a plate 5. After depositing by welding the nut 4 positioned concentrically, when pulling up a guide pin, the holding ring is separated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nut welding positioning tool for concentrically joining a plate hole and a nut screw hole, and a method therefor.

[0002]

2. Description of the Related Art FIG. 13 shows a conventional nut welding positioning tool. In the figure, reference numeral 7 denotes a stepped shaft-like member having a guide portion 7a to be inserted into a plate mounting hole portion and a tip screw portion 7b formed concentrically therewith. Mounting tool, 4 is a nut that is a workpiece, 5
Is a plate which is a work, and 5a is a mounting hole.

Next, the operation will be described. The mounting tool 7 is inserted into the mounting hole 5a of the plate 5, and the nut 4 is screwed into the tip screw portion 7b of the mounting tool 7 from the opposite side across the plate 5. In this manner, the nut 4 and the plate 5 are welded and joined by a welding device (not shown) while the lower surface of the nut 4 is brought into contact with the surface of the plate 5 by the mounting tool 7. Next, the mounting tool 7 is rotated to release the screw engagement between the tip screw portion 7b and the nut 4.

[0004]

Since the conventional mounting tool is constructed as described above, it is necessary to have a stubborn posture in order to screw the nut from the opposite side of the plate. In addition, there is a problem in that workability is poor and it takes a long time because the screw tightening system uses a nut screw.

The present invention has been made to solve the above problems, and a nut can be inserted together with a mounting tool from the insertion direction of a plate mounting hole, and the nut can be easily removed even after welding to the plate. The purpose is to obtain a nut welding positioning tool.

[0006]

A mounting tool according to the present invention has one end of a guide pin formed into a spherical shape to have a groove, a shaft portion for guiding a nut screw portion at a central portion, and a base portion for gripping. With the grip attached, the spherical surface at the tip and the central shaft are machined concentrically.

Further, the plate surface is provided with angular recesses that come into contact with the two opposing outer surfaces of the nut and the opposing apex angle portions.

Further, the plate surface is provided with a positioning member that comes into contact with the three outer surfaces of the nut.

Further, the positioning member has an extruded portion formed on the plate material by press molding.

Further, one molding die provided with a notched surface portion forming three outer surfaces of the nut and a recessed inclined portion, and another molding die provided with a protruding surface portion facing the notched surface and a convex inclined portion,
This is a method for forming a protrusion in which a plate plate material is arranged between these molding dies, and an extrusion molded part that can come into contact with the three outer surfaces of the nut is formed on the plate plate plate by press working.

Further, a projection diameter portion is provided on the bottom surface of the nut so that the nut can be fitted into the plate mounting hole.

The outer surface of the nut other than the positioning contact portion on the outer surface of the nut is used as the welded portion.

[0013]

The nut welding positioning tool according to the present invention is
The nut is concentrically positioned in the mounting hole of the plate, and the retaining ring is attached by the ball head of the guide pin holding the nut, and the retaining ring is inserted into the mounting hole to obtain the concentric position.

Further, concentric positioning is performed on the plate surface by an angular recess that contacts the outer surface of the nut.

Further, the plate surface is provided with a positioning member that comes into contact with the three outer surfaces of the nut for concentric positioning.

In addition, since the abutment portion is formed by extruding the plate plate material by press working, the positioning portion can be obtained without complicated processing.

Further, the pair of press-forming dies press-processes to form the extrusion-molded portions on the plate plate member, which can come into contact with the three outer surfaces of the nut, so that the press-working can be automated.

Further, since the nut is provided with the projection diameter portion so as to be fitted to the plate, the welding work is simplified.

Further, since the outer surface of the nut other than the positioning contact portion having a predetermined height that abuts on the outer surface of the nut is the welded portion, the welded portion does not project and the appearance is improved.

[0020]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a stepped shaft shape, which divides a ball head 1a formed at one end into two along the axial direction.
A guide pin 1c is provided, a shaft portion 1b is provided at a central portion in the axial direction to be inserted and held in the screw inner diameter 4a of the nut 4, and a screw portion to be screwed with the grip portion 2 is provided at the other end. Is tubular,
An inner diameter portion 3a into which the ball head 1a of the guide pin 1 can be press-fitted, and a holding ring provided with a diameter that can be inserted into the mounting hole 5a of the plate 5.

In the nut welding positioning tool constructed as described above, since the ball head 1a has a spherical shape and the split groove 1a is provided, there is a spring action, and the retaining ring 3 for holding the nut 4 is inserted. And hold, facilitate the action.

Next, the operation will be described. The nut 4 is inserted into the guide pin 1 screwed with the grip portion 2, the radial position is determined and held by the shaft portion 1b, and then the inner diameter portion 3a of the holding ring 3 is held.
The ball head 1a of the guide pin 1 is press-fitted therein, and the retaining ring 3 is retained by its spring action. In this state, the retaining ring 3 is inserted into the mounting hole 5a of the plate 5 which is the work, and the nut 4
The lower surface of is contacted with the upper surface of the plate 5. The nut 4 is now positioned concentrically with the mounting hole 5a in the plate 5. In this state, the nut 4 is welded and joined by welding as in the conventional case. Next, when the guide pin 1 is pulled upward along the axial direction, the ball head 1a is separated from the inner diameter portion 3a of the retaining ring 3 while being separated, and the retaining ring 3 can be taken out from below.

Example 2. In FIG. 2 and FIG. 3, reference numeral 6 denotes an angular recess provided on the upper surface of the plate 5 concentrically with the mounting hole 5a. Two of the outer surfaces of the hexagonal nut 4 are opposed to each other and a pair of opposing apex angles are used. The parts are in a square shape that substantially abut, and are provided at a predetermined depth, for example, a depth of 3 to 6 mm. Next, when the nut 4 is mounted in the angular recess 6 of the plate 5, the nut 4 is positioned concentrically with the mounting hole 5a. In this state, the nut 4 is welded and joined by welding. The angular recess 6 may be formed by machining with a normal end mill. At this time, an R portion of the end mill diameter is formed in a square corner, but the contact surface with the nut 4 is obstructed. There is no need for special machining.

Example 3. In FIGS. 4 and 5, reference numeral 7 denotes a positioning member, which is concentric with the mounting hole 5a on the upper surface of the plate 5 and is located at a position substantially in contact with the three outer surfaces 4b of the hexagonal nut 4 at equal intervals. A flat plate-shaped member having one side is fixed by a screw 8. The nut 4 is held by the positioning member 7 on three sides, and is fixed by welding while maintaining a concentric position with the mounting hole 5a.

Example 4. In the third embodiment described above, the positioning member 7 is shown as a plate-shaped member fixed with the screw 8. However, FIG. 6 shows that the extrusion molding portion 9 is formed on the plate material of the plate 5 and it is easy to perform without complicated machining. And has the same function as in the third embodiment.

Example 5. 7 and 8 show a molding method by press molding of the extrusion molding part 9 of the above-mentioned Embodiment 4, 10 is the upper die of press molding and the outer surface of the hexagonal nut 4.
Notched surface parts 11 are provided at approximately the same positions as the three surfaces of 4b which are equally spaced.
Is provided, and the sloped groove portion 13 is formed so as to connect the bottom of the notch surface portion 11 and the press surface 12 to each other. 14
Is a lower die of press molding, provided with protruding surface portions 15 facing the notch surface portion 11 of the upper die 10, and connecting the press surface 16 from the top of these protruding surface portions 15 to form a gently sloped sloped portion 17. ing. When the press surfaces 12, 16 of the pair of upper mold 10 and lower mold 14 are opposed to each other, the notch surface portion 11 and the concave inclined groove portion 13 which are the molding portions, and the protruding surface portion 15 and the convex inclined portion 17 are separated by a predetermined distance. That is, the forming portions are formed at intervals of the plate thickness of the plate 5 to be press-formed. These pair of upper molds
10 and lower mold 14 are attached to a press machine not shown, and lower mold 14
The plate 5 is placed on the upper surface with reference to the mounting hole 5a, the press machine is operated to lower the upper die, and the plate 5 is plastically deformed in the above-mentioned forming portion, and the extrusion forming portion 9 is concentric with the attaching hole 5a. Is formed.

Example 6. In FIG. 9, 18 is a protrusion diameter portion provided concentrically with the screw inner diameter 4a on the bottom surface of the nut 4, and the positioning is made by inserting and fitting it into the mounting hole 5a of the plate 5, so in this state it is fixed by welding. To do.

Example 7. In FIG. 10, the nut 4 is positioned in the angular recess 6 of the plate 5 by abutting a pair of apexes facing two opposing hexagonal outer surfaces. Welded portions 19 by welding with the plate 5 are formed and fixed on four surfaces other than the above two surfaces. The welded part 19
May be performed so as to fill not only the outer surface of the nut 4 but also the gap between the angular recesses 6, which improves the appearance. Further, in FIG. 11, the positioning member 7 provided on the plate 5 is positioned by contacting three of the outer surfaces of the hexagonal nut 4 with each other. Welded portions 19 are welded to the plate 5 on three surfaces other than the above-mentioned three surfaces to fix them. Further, in FIG. 12, three of the outer side surfaces of the hexagonal nut 4 are brought into contact with the extrusion molding portion 9 provided on the plate 5 so as to be positioned. Welded portions 19 are welded to the plate 5 on three surfaces other than the above-mentioned three surfaces to fix them.

[0029]

Since the present invention is constructed as described above, it has the following effects.

Since the positioning can be performed from the welding direction of the nut, the work becomes easy.

Since the nut is fixed in the angular recess,
Overall height is reduced.

Since the outer surface of the nut is in contact with the three surfaces at equal intervals, reliable positioning can be achieved.

Further, since the extrusion molding portion is provided at the contact portion with the nut, the number of members can be reduced.

Furthermore, since the extrusion molding portion of the plate plate material is formed by the press molding die, the press working can be automated and the time can be shortened.

Further, since the nut is provided with a protrusion so as to be positioned, the welding work can be simplified.

Further, since the outer surface other than the contact surface of the outer surface of the nut is the welded portion, only the welded portion does not project and the appearance is improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a plan view showing a second embodiment of the present invention.

FIG. 3 is a sectional view of FIG.

FIG. 4 is a plan view showing a third embodiment of the present invention.

5 is a cross-sectional view of FIG.

FIG. 6 is a sectional view showing Embodiment 4 of the present invention.

FIG. 7 is a developed plan view of a pair of press molding dies showing a fifth embodiment of the present invention and a side view showing a press molding method.

FIG. 8 is a side view showing an extrusion molding unit according to FIG.

FIG. 9 is a sectional view showing Embodiment 6 of the present invention.

10A and 10B are a plan view and a sectional view showing a seventh embodiment of the present invention.

11A and 11B are a plan view and a sectional view showing a seventh embodiment of the present invention.

FIG. 12 is a sectional view showing Example 7 described above.

FIG. 13 is a sectional view showing a conventional nut welding positioning tool.

[Explanation of symbols]

 1 Guide pin 3 Holding ring 4 Nut 5 Plate 6 Square recess 7 Positioning member 9 Extrusion molding part 10 Upper mold 14 Lower mold 18 Projection diameter part

Claims (7)

[Claims] 1. A spherical groove formed on one end of a stepped shaft is provided with a split groove along the axial direction, and a shaft portion for inserting and holding the nut inside diameter is provided on the central portion in the axial direction, and the other end. A nut welding positioning tool characterized in that a guide pin whose part engages with the grip part, a holding ring which is provided so as to be inserted into a mounting hole of a plate, and the holding ring is detachably press-fitted and held by the ball head. . 2. An upper surface of the plate provided with the mounting holes is provided with angular recesses concentric with the mounting holes, which substantially come into contact with two opposing outer surfaces of the nut and a pair of opposing apex portions. Nut welding positioning tool characterized by. 3. A nut welding positioning tool characterized in that a positioning member, which is concentric with the mounting hole and is substantially in contact with the three outer surfaces of the nut, is provided on the upper surface of the plate provided with the mounting hole. 4. The nut welding positioning tool according to claim 3, wherein the convex portion is formed by extruding a plate material. 5. A press forming method, comprising: a cutout surface portion that forms three of the nut outer side surfaces; and a recessed inclined groove portion that connects the bottom portion of the cutout surface portion to the press surface. Another molding die including a mold, a protruding surface portion facing the notch surface portion of the one molding die, and a convex inclined portion provided so as to communicate with the press surface from the top of the protruding surface portion, and between these molding dies. A method for forming a protrusion of a nut welding positioning tool, comprising arranging a plate plate material and press-working the plate plate material to form an extruded molded part on one surface of the plate plate material that can come into contact with the three outer surfaces of the nut. 6. A nut welding positioning tool characterized in that a projection diameter portion is provided on the bottom surface of the nut concentrically with the screw inner diameter, and the projection diameter portion can be fitted into a mounting hole of a plate. 7. A contact portion for substantially positioning and contacting the outer surface of the nut, and a nut outer surface other than the contact portion are welded portions. The nut welding positioning tool according to the item.