JPS59104240A - Method for producing anchor nut and its product - Google Patents

Abstract

PURPOSE:To obtain inexpensively a product having high accuracy by forging a blank material consisting of an annular part to be formed into a flange and a small circular cylindrical part projecting concentrically and integrally therefrom in a first stage, and providing an internal screw to the inside surface of the cylindrical part formed in a final stage. CONSTITUTION:A material W is punched by a die 10, whereby a blank material 1 consisting of an annular part 1a and a small circular cylindrical part 1b projecting concentrically and integrally therefrom is forged. The material 1 is fed to a die 11, by which a cylindrical part 2' is forged and a forged article 2 formed of a slit long hole 2c is extruded. The article 2 is fed to a die 12 by which a forged article 3 is extruded. The article 3 is then fed to a die 13, by which an end plate 4b is punched by a piercing pin 13a, and an internal screw 5 is provided on the inside peripheral surface of a cylindrical part 4a. The product having high accuracy is obtd. inexpensively by the above-mentioned method.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an anchor nut, also known as a rivet nut, which is attached in a caulking manner like a rivet, and a product thereof. It is provided easily and inexpensively.

The details will be explained below with reference to the drawings.

Figure 1 shows the steps for carrying out the method of this invention, in which one product (
Anchor nuts).

First, in the cutting process, a continuous metal round bar is intermittently sent out from the tip end of the tile, and is cut by a movable blade (both not shown) that crosses the tip end.

Diameter as shown in Figure 1 (a), Figure 2 μ) (a),
A short cylindrical material W having a length L is obtained.

The material W thus obtained is simultaneously cut and pushed to the immediate front of the die 10 in the first step, where it is subjected to the first punching action by the advancement of the corresponding punch 20.

The die 10 has a mold hole 10 having a step 10a and a knockout pin J that becomes the bottom of the uJM hole when the punch is press-fitted, and the corresponding punch 2o is fitted into the mold hole 10.
The material 1 is formed by the action of the punch 20, which has an A section 20a at the tip, and is made up of an annular section 1a having a concave section 1a on the end surface and a small cylindrical section 1b that protrudes concentrically. Figure 2(b)(b)).

In the second step, the rope material 1 obtained in the previous step is extruded with a knockout pin (9), grabbed with a chuck, and then cut into a die 11.
The punch 21 used in the 6 second process is supplied immediately before the first
As shown in Figure IQ)K, the die-shaped hole 1 consists of a hollow vertical hole.
A rod-shaft punch having a spline-shaped notch 21a inscribed in 1 is used.

When the material 1 obtained in the first step is upset into the die hole 11 in the second step (Q) and pushed in with the rod glaze punch 21, the concave portion 1a becomes deeper and the small cylindrical portion 1b is expanded. A cylindrical portion 2 whose tip is closed with an end plate 2b which is extended and concentrically integrated with the annular portion 2a.
' is pressed. When this cylindrical part is forged, the thickness of the cylindrical part is scraped off by the spline-shaped protrusion 21a.
A long slit hole 2c is formed on the surface. At the same time as the shaft punch 21 retreats, the knocker top pin 31 is exposed from the bottom of the die hole 11 and extrudes the forged product 2.

In the third step, the forged molded product 2 obtained in the previous step is pushed into the straightening die 12 with a rod-shaped punch 22 to straighten the end face, and the entire forged molded product 3 including the 7 langes 3a and end plates 3b is almost a finished product. Create a sharp shape. At this time, the flange 3a is formed into a hexagonal disk shape as shown in FIG. 2 fd). The molded product 3 is pushed out by the knockout pin 32 and fed to the final process by a chuck.

In the final process, a piercing bin 13a is placed on the die 13 side.

A core punch 23a is provided on the punch n side, and when the two are fitted together, the end plate 4b is punched out, and a slit elongated hole 2 is formed at the tip of the molded product 4.
A cylindrical portion 4a having no C is formed.

After this forged product 4 is extruded with a knockout pin 33, a female thread 5 is provided on the inner peripheral surface of the cylindrical portion 4a.

FIG. 5 shows another embodiment of the third step (FIG. 1 d), which makes it possible to form circumferential grooves 7 in the middle of the strip 6 between the slit holes 20 by forging. This is what I did. In this case, the die 14 is a tapered split die, and when it is pushed inward, it contracts in diameter and firmly holds the cylindrical body 3 from the outer peripheral surface. In step a, grooves 7 are formed on the strip 6 by extrusion. In Figure 5, 1
5 is a fixed cam, 16 is a stop pin, and Sae is a punch.

An example of the use of the anchor nut is shown in FIG. After the 4 heading steps, the product 8 obtained by providing the screw 5 is fitted into the through hole of the mounting plate cutout, and a rivet tool (not shown) is inserted through the hole on the 7 lange side and screwed into the threaded part 5. Tighten and apply compressive load from both ends. Then, the strip plate piece 6 between the slit elongated holes 30
When it exceeds its breaking point, it buckles radially outward and bends into a bifold petal-like shape. Therefore, in order to clamp the mounting plate ω between the flange 3a and the petal-shaped strip piece 6a, the mounting plate ω is fixed integrally with the mounting plate ω so that it cannot be removed in any direction. The object to be attached 41 is attached by again screwing another bolt string onto the anchor nut fixed in this way.

In FIG. 4, the inner and outer circumferential surfaces of the flange 3a are square so that rotation of the crimping tool can be prevented from either the inside or the outside during the crimping operation. This flange 3a
In some cases, the square part may be only on one of the inner and outer sides.

As explained above, in the first step, a material consisting of an annular portion that becomes a flange and a small cylindrical portion extending concentrically is pressed, and in the next step, a spline-shaped protrusion inscribed in a die hole is formed. When the small cylindrical part is extended to the axial length by press-fitting it with an axial rod punch and the cylindrical part is forged, a part of the cylindrical part is torn and a long slit hole is formed on the circumference, and the end face is straightened. The end plate of the cylindrical part is then punched out using a piercing pin, and by using a continuous multi-stage former, anchor nuts, which did not exist in the past, can be easily and reliably pressed and formed into a superior product with high precision. can be obtained at low cost. Moreover, as a product, the strip between the long slit holes in the cylindrical part is bent in half from the middle part by compressive load from both ends, and is folded into a petal-like shape, making it easy to use as it is firmly and securely fixed. Construction is easy and there is no loss, increasing work efficiency.

[Brief explanation of the drawing]

The drawing shows an embodiment of the invention, and shows the 11th town (b).
fQ) (d) fe) shows the order of the forging process using punches and dies. 4 is a cross-sectional view taken along line 8-A in the drawing direction, FIG. 4 is another embodiment of the flange part of the product anchor nut, and FIG.
), FIG. 6 is a partially longitudinal front view of the product anchor nut obtained in the same process, FIG. 7 is a sectional view taken along the line B-B in FIG. 6, and FIG. The figure is a longitudinal cross-sectional view showing an example of how the anchor nut is used. 1...Material 2, 3.4...Forged product 5...Female thread 6...Strip plate piece 7...Concave groove 8 Product (anchor nut) 2...
Cylindrical portion 3a...flanges 10, 11,
12, 13, 14...Dice 20, 21, 2
2, 23, 24...Nosunchi Application Large Sakamura Sangyo Co., Ltd. Procedural Amendment (Method) 1937 4 No! 251-I Patent No. 1, 71 Commissioner of the Agency Wakasugi Aio 1, List of Cases 1, 1988 Patent No. 213775 Explosion, Kyoto Prefecture, Kuze District, Kue 1, Yamamachi Oaza Shimotsuya Koaza Address: Tsuge, Sunojo Name (Name f+:) Representative of Sakamura Sangyo Co., Ltd.
Hiroyuki Tsujino 4, Agent 5 Date of amended order: March 9, 1981 (Showa Edict, sent on March 29) Supplement
Original book 1 0 in the specification) 3rd line 6th line [Fig. 2 1aHa)
a) and Figure 3 (a).” (2) In the 4th line from the bottom of the third page, [Figure 2 (bl(b)J)
2(b), 3(b)". (3) Correct "Figure 2 (d)" in the bottom three lines of the fourth page to "Figure 2 (d)" by d1. (4. The brief description of the drawings has been corrected as follows. ``The drawings show an embodiment of the present invention, and Figure 1 is a cross-sectional plan view of the forging device section, and %kHbHol (dHθ) indicates the forging process. , I Figure 2 is a plan view of the material (alfbHcl
fdHe) indicates the process order. Figure 3 is a front view of the material showing the left half in section (a)(bl(01(d)(
el(f) indicates the order of the steps. Fig. 4 is a diagram of another embodiment of the 7-rung part of the product anchor nut, Fig. 5 is a cross-sectional plan view of the forging device section showing another embodiment in the third step, and Fig. 6 is a diagram showing another embodiment of the 7-rung part of the product anchor nut. 7 is a sectional view taken along the line B-B shown in FIG. 6, FIG. 8 is a sectional view showing an example of the use of the anchor nut, and FIG.
The figure is a sectional view taken along line A-A in FIG. 3. 2. In the drawings attached to the application: (1) Add the words "Figure 3" below Figure 1, as shown in the red circle mark on the separate figure. (3) Delete Figure 2 (a) to (81) and add attached Figure 2. (3) Delete Figure 3 and add attached Figure 9.

Claims (1)

[Scope of Claims] 0) Long slit holes are formed at equal intervals on the circumference in the longitudinal direction of the curved axis of the cylindrical part, female threads are formed on the inner peripheral surface of the tip opening of the cylindrical part, and a flange is provided at the base end of the cylindrical part. This is a continuous multi-stage heading method for an integrally formed anchor nut, in which a material consisting of an annular part that becomes a flange and a small cylindrical part that protrudes concentrically is pressed in the first step, and then in the next step. When the small cylindrical part is extended to the axial length and forged into a cylindrical part by press-fitting it with a shaft punch with a spline-shaped protrusion inscribed in the die-shaped hole, a part of the cylindrical part breaks and a long slit hole is formed on the curved surface. A method for producing an anchor nut, which comprises forming a nut, correcting the end face, and then punching out the end plate of the cylindrical part with a piercing pin. @) Elongated slit holes are provided at equal intervals on the circumference in the longitudinal direction of the curved axis of the cylindrical portion, female threads are provided on the inner peripheral surface of the tip opening of the cylindrical portion, and a flange is integrally provided at the base end of the cylindrical portion. An anchor nut characterized in that the shape and size of the long slit holes in the cylindrical part are positioned so that when the female screw part is tightened, the strip pieces between the adjacent long slit holes open and bend in the shape of two folded petals from the middle. . (3) The anchor nut according to claim 2, characterized in that a groove in the circumferential direction is provided in the middle part of the band plate piece, which is the bent part. (4) The anchor nut according to claim 2, wherein one or both of the inner and outer circumferential surfaces of the seven flange are square.