JPH0454086B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a method of manufacturing a core rod driving type anchor bolt body for installing various types of machinery on foundations such as concrete.

``Prior art'' Conventionally, when manufacturing the anchor bolt body as described above, when a round bar cut to a predetermined length was used as the material, an inner hole for driving the core rod was drilled with a drill machine. In view of the length of the product and the hardness of the material, the drilling process is extremely difficult, inefficient, and less accurate, which poses a serious problem in mass production.

Therefore, a cylindrical member that forms an anchor bolt body and an inner hole portion, as disclosed in Japanese Patent Application Laid-open No. 184211/1983, is used.
A manufacturing method has been developed in which the cylindrical member and the spread leg member having the bottom of the inner hole are provided separately, and the cylindrical member and the spread member are joined.

"Problems to be Solved by the Invention" However, although the anchor bolt body manufactured by the above method is extremely strong against compression in the axial direction, it is extremely weak against tension and deformation in the circumferential direction due to the opening of the legs of the spread member. , there was a risk of rupture within the foundation.

``Means for Solving the Problems'' However, the present invention includes a primary forming means that compresses one end side of a material cut to a predetermined length using a die and a punch to form an expanded portion; secondary forming means for forming a widening sealing head at the end of the expanded portion; and a secondary forming means for press-fitting the sealing head into the die with a punch to squeeze the sealing head to the original diameter of the material, and forming a recessed portion on the side of the sealing head. Further, a tertiary forming means compresses and forms an inner hole on the other end side, and a quaternary forming means press-fits the material into a die having a fixing plug using a punch and compresses and forms a thin wall portion for the threaded surface on the outer periphery of the inner hole. , a tertiary forming means that compresses the material using a die and a punch to form a tapered surface on both edges, and a rolling means that uses each die to form a threaded surface and a ring groove on the outer circumferential surface of the thin wall part and the outer circumferential surface of the depressed part of the material. and a dividing groove means for press-fitting a cross cutting blade in the axial direction from the concave portion forming end of the material to form a split leg piece.

[Effect]

Therefore, according to the present invention, the material is not cut or heat welded to make it brittle, but is entirely processed by forming means using dies, punches, etc.
It prevents the formation of discontinuous parts in products, makes products with high precision and excellent toughness easy to process, and can be mass-produced. Therefore, uniform, high-quality products can be produced efficiently and at low cost. It can be made available.

"Function" Therefore, according to the present invention, a product can be manufactured from a single material obtained by cutting a long steel pipe material into a predetermined length.
It is possible to eliminate deep hole machining, which reduces work efficiency and causes eccentricity of the inner hole, and also prevents the formation of discontinuous parts in the product, ensuring uniformity of the product with high precision and making mass production more efficient. This can be done.

"Embodiments" Examples of the present invention will be described in detail below based on the drawings. As shown in FIGS. 4 and 5, the anchor bolt main body product 1 according to the present invention is formed with a cross-shaped longitudinal groove 4 by driving a nail serving as a core rod into the inner hole 2 of the product 1. The split leg piece 5 at the bottom end of the product 1 is opened and fixed to a shaft hole in a foundation such as concrete, and the inner hole 2 is formed from the top end of the product 1 to near the bottom end, and the vertical split groove 4 is formed. It is formed from the lower end of the product 1 to the bottom of the inner hole 2. In addition, a threaded surface 7 is formed on the outer circumferential surface of the upper part of the product 1 to hang, for example, equipment to be connected to an installed machine via a seat nut 6, and a threaded surface 7 is formed on the outer circumferential surface of the lower part of the product 1, that is, the outer circumferential surface of the split leg piece 5. Ring grooves 8 are formed in multiple stages to increase the engagement force with the foundation. Further, the bodies of the product and the nail 3 are formed to have the same length, so that when the nail 3 is driven into the product 1, the tip of the nail 3 is exposed to a predetermined leg opening amount of the split leg piece 5, that is, the length is sufficient. Product 1
It is formed on the lower end surface.

Then, as shown in FIG. 2, the long steel pipe material 11 wound in a coil around the winding device 10 is fed to the cutting machine 13 via a plurality of straightening rollers 12, and
The steel pipe material, that is, the raw material 11a cut into a predetermined length by the cutting machine 13, is processed and formed into the product 1 by a press device 14, a rolling device 15, and a slotting device 16, which are integrated with the cutting machine 13. .

The press device 14 uses a die and a punch to perform a five-step process from A to E in FIG. 1.
Processing and forming of the material 11a up to
Each stage will be explained below.

- In the first step, one end of the material 11a is fixed to the die 17, and the other end is compressed by the punch 18 to form the expanded portion 19. (A in Figure 3 and A in Figure 1).

- In the second stage process, subsequent to the first stage, the expanded portion 19 of the material 11a is compressed with a punch 20 to form a wide-diverging sealed head 19a. (Figure 3 B and Figure 1 B).

- In the third stage process, the sealing head 19a is press-fitted into the die 17 using a punch 21 having a protrusion 21a at the tip, and the diameter of the original material 11a is reduced. (C in Figure 3 and C in Figure 1).

In this third step, the inner hole 2 and depression 9 of the product 1 are formed in the material 11a.

- In the fourth stage process, the material 11a on the outer periphery of the inner hole 2 is press-fitted into the die 23 having the fixing plug 23a using the punch 22, and a thin part 24 and a tapered part 25 corresponding to the root diameter of the thread surface 7 of the product 1 are inserted. form. (D in Figure 3 and D in Figure 1).

●In the fifth stage process, insert the thin part 24 side of the material 11a into the die 25, and insert the other end into the punch 26.
is compressed to form tapered surfaces 27 and 28 on both end edges. (E in Figure 3 and E in Figure 1).

As described above, E in FIG. 1 by the press device 14 is
Next, as shown in FIG. In addition, the ring groove 8 of the product 1 is stamped on the other outer circumferential surface using flat dabs 30, 30 having a semi-cylindrical shape, and then, as shown in G in FIG. The product 1 of the anchor bolt body is completed by press-fitting in the axial direction from the end of the recessed portion 9 of the anchor bolt 11a to form the split leg pieces 5 together with the longitudinal grooves 4 of the product 1.

"Effects of the Invention" As is clear from the above embodiments, the present invention has the advantage of cutting one end of a material 11a cut into a predetermined length into a die 1.
7 and a punch 18 to form an expanded portion 19 by compression, and a die 17 and a punch 2.
0 to form a wide-divergent sealed head 19a at the end of the expanded portion 19; and a punch 21 to press fit into the die 17 to squeeze the sealed head 19a to the original diameter of the material 11a. At the same time, a material 11 is formed into a die 23 having a fixing plug 23a by a punch 22 and a tertiary forming means for compressing and forming a depression 9 on the side of the sealing head 19a and an inner hole 2 on the other end side.
The material 11a is compressed by a quaternary forming means that compresses and forms a threaded surface thin part 24 on the outer periphery of the inner hole 2 by press-fitting the material 11a, and a die 25 and a punch 26 to form tapered surfaces 27 and 28 on both end edges. A tertiary forming means, a rolling means for forming a threaded surface 7 and a ring groove 8 using dies 29 and 30 on the outer circumferential surface of the thin wall portion 24 and the outer circumferential surface of the recessed portion 9 of the material 11a, and a recessed portion of the material 11a. 9, the cross cutting blade 31 is press-fitted in the axial direction from the forming end to form the split leg piece 5. Therefore, deep hole machining with eccentricity of the inner hole 2 is performed, resulting in low precision. dies 17, 23, 25 and punches 18, 2 without inconveniences such as cutting or heat welding the material 11a to make it brittle.
0, 21, 22, 26, etc., to prevent the formation of discontinuous parts in the product, making it easy to process and mass-produce products with high precision and excellent toughness. Therefore, uniform, high-quality anchor bolts can be obtained efficiently and inexpensively, and the workability and economic efficiency of installation work using these bolts can be improved, which is a remarkable effect.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the manufacturing process of the anchor bolt body according to the present invention, FIG. 2 is an explanatory diagram of the entire manufacturing apparatus,
FIG. 3 is a process explanatory diagram of the press device, FIG. 4 is a cross-sectional explanatory diagram of the product, and FIG. 5 is a bottom view thereof. 1...Product (anchor bolt body), 2...Inner hole,
5... Split leg piece, 7... Threaded surface, 8... Ring groove, 9... Recessed portion, 11... Steel pipe material, 11a... Material.

Claims (1)

[Claims] 1. A primary forming means that compresses one end side of a material cut to a predetermined length with a die and a punch to form an expanded portion, and a means for compressing with a die and a punch to form a divergent sealed head at the end of the expanded portion. secondary forming means for forming, and tertiary forming for press-fitting into the die with a punch to narrow the sealing head to the original diameter of the material, and compressing and forming a recessed portion on the side of the sealing head and an inner hole on the other end side. means for press-fitting the material into a die having a fixing plug using a punch to compress and form a thin-walled portion for the threaded surface on the outer periphery of the inner hole; A tertiary forming means for forming a tapered surface, a rolling means for forming a threaded surface and a ring groove using each die on the outer circumferential surface of the thin wall part and the outer circumferential surface of the recessed part of the material, and A method for manufacturing a core rod driving type anchor bolt body comprising a split groove means for press-fitting a cross cutting blade into a split groove to form a split leg piece.