JPH03311A - Production of lock ring for nut - Google Patents

Abstract

PURPOSE:To form a bent line at right angle from a circular plate body easily even if each bent line is made high, by forming multiple recesses on the outer periphery of a circular flat plate at equal intervals and providing a V-shaped recess on the internal periphery of a circular hole drilled at the center of the flat plate. CONSTITUTION:A circular plate body 17 with six recesses 16 on its periphery at equal circular intervals is punched out from a plate body 15, and the outer peripheries of the circular plate body 17 are bent to one side through the bending center lines 14 connecting the deep inner peripherical edges of the recesses 16, adjacent to each other, of the circular plate body 17. By this, a hexagonal plate body 18 is formed from the circular plate body 17 and bent edges 19 are formed at each side of the hexagonal plate body 18. In addition, a circular hole 20 is drilled at the center of the hexagonal plate body 18 and a V-shaped recess 21 is drilled at one point of the periphery of the circular hole 20. Also, an eccentric twisted edge 22 is formed on the internal periphery edge of the circular hole 20 so that the both edges 21a, 21a of the V-shaped recess 21 facing to each other may open the vertical distance set to the screw pitch to a bolt to be inserted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a locking ring for a nut.

(Prior Art) A locking ring 1 for a nut, which is fitted onto a bolt in contact with one side of the nut, is shown in FIGS. 9 and 10 in order to prevent the nut from loosening due to reverse rotation.
As shown in the figure, a hexagonal plate 3 having a circular hole 2 has a bend @4 on each side of the outer periphery, and a substantially V-shaped notch 5 is provided on the inner periphery side of the circular hole 2. Both sides of the mold cutout 5 @6.
An eccentric twisted edge 7 is provided on the inner peripheral edge of the circular hole 2 at a vertical interval to match the pitch of the thread groove of the bolt into which the hole 6 is fitted. To use this locking ring 1, as shown in FIG. 11, the locking ring 1 is fitted onto the nut 9 screwed onto the bolt 8.

At this time, insert the eccentric twisted edge 7 from the V-shaped notch 5 into the bolt 8.
into the screw groove 8a of the nut 9 and turn the locking ring 1, pressing one side of the hexagonal plate 3 against one side of the nut 9.

As a result, as shown in FIG.
The negative side edge 6 is deeply wedged into the thread groove a by the force of pressing against one side of the screw. Therefore, the locking ring 1 is prevented from rotating, and the tightened nut cannot rotate in the loosening direction.

This serves to prevent the nut 9 from loosening.

As shown in FIG. 12, this locking ring 1 has a large number of starting points 11 marked at regular intervals on the inside of the outer periphery of a circular flat plate 10.
The outer periphery is bent between these adjacent starting points 11 as bending lines 12 to form the above-mentioned bend g:4, and at the same time, the circular hole 2 and the V-shaped notch 5 are punched out, and the circular hole 2 is punched out. An eccentric twisted edge 7 is formed by bending the inner peripheral edge.

(Problem to be Solved by the Invention) Since the locking ring 1 is manufactured as described above, the height h of each bend R4 (see FIG. 10) cannot be increased, and therefore the locking ring 1 cannot be screwed onto the bolt 8. When pressing the nut locking ring 1 against one side of the nut 9, a tool is fitted into the parallel bent edges and turned, but since the bent edges 4 are small, the tool cannot be fitted properly and comes off. easy. Therefore, it is difficult to tighten tightly.

In addition, in order to secure a certain height h of each bent edge 4, a bending starting point 11 is provided slightly inside from the outer peripheral edge of the circular flat plate 10, and when bending each bent edge 4, 11 starting points are provided. The thickness of the flat plate 10 may bulge out from each corner 13, protruding as shown in FIG. 9, and there is a danger that handling will be impaired. In addition, each of the above bent edges 4
If the height h is increased, the thickness will be closer to each corner, and each bent edge 4 will not be bent at right angles to the flat plate 10. This is more noticeable when the flat plate 10 is thick. If each bent edge 4 is not bent at right angles to the flat plate 10 in this manner, the tool will not be properly locked when fitting the bolt 8 and turning it. In addition, the flat plate 10 or the hexagonal plate 3 is also curved when forming the bent edge 4, making it difficult to bend the side edges 6 and 6 of the V-shaped notch 5 of the circular hole 2, and the bolt 9 to be fitted There is a risk that an eccentric twisted edge 7 that does not match the pitch of the thread groove 8a may be produced.

(Means for Solving the Problems) This invention has been made in view of these points, and even if the height of each bent edge is increased, each bent edge can be easily formed at right angles from a circular plate. The present invention provides a method for manufacturing a locking ring for a nut.

The specific configuration of the present invention is to form a large number of notched grooves at regular intervals on the outer peripheral edge of a circular flat plate, and to set the bending center line as a line connecting the deep inner edges of each of these adjacent notched grooves to form the outer peripheral edge. is bent to provide each bent edge, and a circular hole is bored in the center of the flat plate, a V-shaped cut is provided on the inner peripheral edge of the circular hole, and both side edges of this V-shaped cut are used for fitting bolts. This is a method of manufacturing a locking ring for a nut, in which eccentric twists are formed on the inner peripheral edge of a circular hole at intervals of the thread groove pitch.

(Function) In this invention, a circular flat plate is processed into a shape in which a large number of notched grooves are provided at regular intervals on the outer peripheral edge of the flat plate.

This allows a flat plate to be punched directly into this shape. In addition, since a large number of notched grooves are pre-drilled on the outer periphery of the circular flat plate in this way, by bending the outer periphery between adjacent notched grooves, the excess thickness is pushed into the gap between each notched groove. Each bent edge can be easily bent at right angles.

Therefore, even when forming this bent edge, the circular flat plate does not curve and maintains its planar shape, making it easy to form an eccentric twisted edge at the inner peripheral edge of the circular hole.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

First, as shown in FIG. 1, a circular plate 17 is punched out from the plate 15, with six notch grooves 16 bored at regular intervals on the outer circumferential edge of the circular plate, and as shown in FIG. The outer circumferential edge of the circular plate 17 is bent to one side at each bending center 11A14 that connects the inner circumferential edge of the deep part of the notch groove 16, thereby forming the third
As shown in the drawings and FIG. 4, the circular plate 17 is replaced by a hexagonal plate 18, and bent edges 19 are formed on each side of the hexagonal plate 18. Note that each of the above-mentioned bending center lines 14 serves as a center line when the bending edge 19 is bent, and therefore, the inner surface of each bending edge 19 is located inside of each bending center line 14.

Furthermore, a circular hole 20 is bored in the center of this hexagonal plate 18, and a V-shaped notch 21 is formed on the side of the circumferential edge of this circular hole 20.
wear it. Also, the opposite side edges 21a, 21a of this V-shaped notch 21 are attached to the inner peripheral edge of the circular hole 20 so as to have a vertical interval corresponding to the pitch of the bolt groove of the bolt to be fitted, as shown in FIG. An eccentric twisted edge 22 is formed.

In this way, the locking ring of the present invention is manufactured.

To specifically explain the manufacture of these together with the apparatus based on FIGS. 6 to 8, a hexagonal prism-shaped lower presser 25 having a central vertical hole 24 is fixed on the base 23, and this lower presser 2
On the upper side of 5, both side edges 21 of the V-shaped notch 21 are provided.
a, groove and protrusion into which 21a is bent and fitted (not shown)
The lower presser foot 25 is loosely fitted into the hexagonal hole 26a of the slide base body 26, which is movable up and down on the base base 23.
A spring 27 is provided between the slide base 26 and the base 23, and the slide base 26 is urged by the spring 27 so that its upper surface is always positioned on the upper surface of the lower presser 25. Then, as shown in FIG. 6, the circular plate 17 is placed on the upper surface of the lower extension 25 and the slide base 26. At this time, a circular plate 1 is attached to the top of each outer periphery of the lower presser foot 25.
7 so that each notch groove 16 on the outer periphery is positioned. In order to maintain the directionality of each notch groove 16, the shape of the outer periphery of each bent edge 19, and the concentricity of the circular hole 20 and the V-shaped notch 21.

Although not shown, in reality, after punching out a circular plate 17 on the plate 15, the circular plate 17 is fitted into the original position of the plate 15, and in this state, the circular plate 17 is attached to the lower presser 25. Perform the following processing such as mounting. Then, as shown in FIG. 7, an upper presser 28 having a hexagonal cross section is pressed against the center of the circular plate 17 from above. This pressing of the upper presser foot 28 is performed by pressing the pin 32 from above with a spring (not shown). Although not shown, several pins 32 are provided along the outer periphery of the upper presser 28.

In this way, the circular plate 17 is held down at the top and bottom, and in this state, as shown in FIG. The outer peripheral edge is bent to form the respective bent edges 19, and a hexagonal plate body 18 surrounded by these bent edges 19 is formed. At the same time, the center hole 2 of the upper presser foot 28
The circular punching die 30 passed through the hole 8a is pressed against the center of the circular plate body 17 to punch the circular hole 20, and the circular hole is formed by the ridge 31 having a chevron-shaped cross section provided on one side of the circular punching die 30. A V-shaped notch 21 is cut out on one side of 20.

Further, the upper presser 28 is fixed by the pin 32 shown in FIG.
By strongly pressing the hexagonal plate 18 against the hexagonal plate 18, the grooves and protrusions (not shown) on the upper surface of the lower presser 25 and the corresponding grooves and protrusions (not shown) provided on the lower surface of the upper presser 28 are formed.
The hexagonal plate 18 is clamped and deformed, and the eccentric twisted edge 22 is formed at the inner peripheral edge of the circular hole 20 as described above.

In the above embodiment, a hexagonal nut locking ring is used, but the manufacturing method of the present invention is not limited to a hexagonal nut locking ring.

(Effects of the Invention) The present invention has the above-described configuration, and since cutout grooves are pre-drilled at regular intervals on the outer periphery of the circular plate, it is possible to easily form a bent edge of an appropriate height on the outer periphery of the plate. can be formed. At this time, both ends of each bent edge have the above-mentioned notch grooves at the bending points, so that the bent edges can be bent at right angles to the circular plate.

As a result, the height of each bent edge can be made large, and a locking ring for the nut can be created that is easy to lock a tool to these bent edges. Further, even if the thickness of the circular body plate to be bent is large, it can be easily bent. Moreover, since the circular plate can maintain its planar shape when forming the bent edge from the circular plate, it is easy to form an eccentric twist on the inner peripheral edge of the circular hole.

Easy to manufacture.

[Brief explanation of drawings]

1 and 2 are plan views showing the manufacturing process of the present invention, FIG. 3 is a plan view of a nut locking ring according to the present invention, FIG. 4 is a bottom view of the same, and FIG. A-A of
6 to 8 are cross-sectional views showing the manufacturing process using the apparatus of the present invention, FIG. 9 is a plan view of a nut locking ring made by a conventional method, and FIG. B of
-B line sectional view, FIG. 11 is a sectional view showing how the nut locking ring of FIG. 9 is used, and FIG. 12 is a plan view showing the manufacturing process of the conventional method. In addition, in the figure, 14 is a bending center line, 15 is a plate, 16 is a notch groove, 17 is a circular plate, 18 is a hexagonal plate, 19 is a bending edge,
20 is a circular hole, 21 is a V-shaped notch, and 22 is an eccentric twisted edge. Figure 8 - Figure 10, - Figure 6

Claims (1)

[Claims] A large number of notched grooves are formed at regular intervals on the outer circumferential edge of a circular flat plate, and the outer circumferential edge is bent using a line connecting the inner edges of the inner parts of the adjacent notched grooves as a bending center line to provide a bent edge. A circular hole is bored in the center of the flat plate, a V-shaped notch is provided at the inner peripheral edge of the circular hole, and both side edges of this V-shaped notch are
characterized by forming an eccentric twisted edge on the inner peripheral edge of the circular hole so as to match the thread groove pitch of the bolt to be fitted;
Manufacturing method for locking rings for nuts.