JPS6233445B2 - - Google Patents

Description

[Detailed Description of the Invention] Conventionally, this type of anchor has been made by making a cylindrical body from pipe material, inserting a separately made press fit into the cylindrical body, and machining female threads, irregularities, and axial grooves on the cylindrical body. Manufactured using Therefore, an expensive pipe material is used for the cylindrical body, and a press-fitting element must be made separately from the cylindrical body and inserted into the cylindrical body.
In addition to the high cost of materials, the cost of making the press-fitting element and inserting it into the cylinder were laborious, which increased the unit price of the anchor.

Therefore, in order to eliminate the above-mentioned defects, the present invention uses a round bar, cuts it to a predetermined size, presses a hole in the axial direction on both sides of the center, and extends the other side outward toward the tip. The round bar is formed into a thick round shape, and then the meat located between the holes on both sides of the round bar is extruded into one hole to make a press fit, and the outer peripheral surface of the other side is restored to fill the hole. Manufactured by forming a taper on the other side, rolling the female thread on one side of the hole, and machining the unevenness and axial kerf on the other side of the cylinder, reducing material costs and labor. A manufacturing method for an anchor is characterized in that the anchor can be easily mass-produced at low cost by machining, and the press-fit element is integrated with the cylinder and does not fall off, making it convenient for handling and work and practically useful. It is something.

To explain the structure of one embodiment of the present invention shown in the drawings, a indicates an anchor, 1 is a cylinder thereof, a round bar is processed and formed by a parts former machine, and holes 2 of the cylinder 1 are formed. The other side part is formed into a taper 3 with a small diameter at the tip, and the middle part houses a press-fit element 4 made by extruding the flesh of the center part of the round bar, and the first side part has a female thread formed by rolling. 5, several circumferential grooves 6 with a triangular cross section are arranged in parallel at very small intervals on the other side of the outer periphery to form unevenness, and several grooves 6 in the axial direction are installed on the other side. 7 are arranged in parallel at appropriate intervals to constitute anchor a.

8 is a concrete wall, 9 is an anchor mounting hole slightly larger in diameter than the cylinder 1, which is drilled in the concrete wall 8, 1
0 is the sliding cutter.

In the cutting process shown in FIG. 5, 11 is the frame of the parts homer machine, 12 is the cutting blade, 13 is the base material of the round bar, and 14 is the material of the anchor a.

In the first step shown in FIG. 6, 15 and 16 are a punch and a die, and the die 16 forms a circular hole. 17 is a dish-shaped recess installed in the center of one end surface of the material 14.

In the second step shown in FIG. 7, 18 and 19 are a punch and a die, and the die 19 is provided with a circular hole. Reference numeral 20 denotes a hole on one side in the axial direction installed at the center of one side of the material 14.

In the third step shown in FIG. 8, 21 and 22 are a punch and a die, and the die 22 is provided with a circular hole with a tapered tip. 23 is a hole on the other side in the axial direction provided at the center of the other side of the material 14.

In the fourth step shown in FIG. 9, 24 and 25 are a punch and a die, and the die 25 is provided with a circular hole with a tapered tip.

In the fifth step shown in FIG. 10, 26 and 27 are push pieces and a die, and the die 27 is provided with a circular hole.

Although not shown, the dice 16, 19,
At the rear of holes 22, 25, and 27, holes are provided concentrically with the holes, and 1 die of the material is placed in each hole.
An extrusion device is installed to extrude the material forward from the holes 6, 19, 22, 25, and 27.

Next, a method for manufacturing the anchor will be explained. A round bar coiled base material 13 is straightened and straightened using a base material straightening device, and its tip is inserted into a hole in the frame 11 as shown in FIG. Make material 14.

First step As shown in FIG.
6 and punch a dish-shaped recess 17 in the center of one end face using a punch 15.

Second step As shown in FIG.
9 and punch a first side hole 20 in the center of one side using a punch 18.

Third step As shown in FIG. 8, the material 14 is placed in the hole of the die 22 with the left and right sides reversed, and the punch 21 punches the other side hole 23 in the center of the other side of the material 14. is pressed against the tapered surface of the tip of the hole of the die 22, and the outer circumferential surface of the other side is formed into a tapered shape with a widening tip, and the other side is extended outward toward the tip to form a thick tsupa shape.

Fourth step As shown in FIG.
5 into the holes 20 and 23 on both sides of the material 14.
The punch 24 pushes out the meat located between the holes 20 on the first side and separates it from the outer periphery of the material 14 to make the press-fit element 4 of the anchor a.
3 to communicate with each other to form hole 2 of anchor a.

5th step As shown in FIG. 10, the material 14 is pushed into the hole of the die 27 using the pushing piece 26, the other side of the material 14 is press-fitted inward, the outer peripheral surface is restored, and the other side inner periphery is pressed. The surface forms a taper 3 on the other side of the hole 2 of anchor a, and the cylindrical body 1 of anchor a
The forging process of the material 14 of anchor a is completed.

After that, a female thread 5 is installed in one side of the hole 2 of the material 14 that has been processed above using a rolling tap, and a circumferential groove 6 is formed on the outer periphery of the other side with a rolling machine or with a lathe. After cutting, cut grooves 7 are cut on the other side using a sliding cutter 10, as shown in FIG. 2, to produce an anchor a with a built-in press-fit element 4.

On the other hand, when attaching the anchor a to the concrete wall 8, as shown in Fig. 3, insert the anchor a into the mounting hole 9 of the concrete wall 8, and then insert the driving rod into the hole 2 of the anchor a. Press-fit piece 4
If the press-fitting piece 4 is driven into the taper 3 part on the other side of the hole 2 by hitting the driving rod with a hammer or the like, the other side of the cylinder 1 will be placed in the cut groove 7 as the press-fitting piece 4 is driven. It is expanded and bitten into the concrete wall 8, and the cylindrical body 1 is fixed to the concrete wall 8, so that the anchor a can be attached.

Note that, instead of the several circumferential grooves 6 described above, a large number of unevenness may be formed on the other side of the outer periphery of the cylindrical body 1.

In the present invention, since the anchor is manufactured as described above, a round bar is cut to a predetermined size, a hole is formed in the axial direction on both sides of the center, and the other side is extended outward toward the tip to thicken the wall. Next, the flesh located between the holes on both sides of the round bar is extruded into one hole to make a press fit, and the outer peripheral surface of the other side is restored to form the other side of the hole. It can be manufactured by forming a taper, then machining a rolled internal thread on one side of the hole, unevenness on the other side of the cylinder, and a kerf in the axial direction, and is cheaper than a pipe. In addition, a part of the flesh inside the round bar is used to create a press fit in the hole of the cylinder, so material for the press fit is not required, and the material cost of the anchor is low, and it is not as expensive as the conventional method. It is possible to manufacture an anchor extremely easily and inexpensively, which eliminates the need for manufacturing a press-fitting element and inserting the press-fitting element into a cylindrical body.

Furthermore, since the material for the anchor is manufactured by forging a round bar, there is less loss of material, and by machining, a uniform product can be produced in large quantities from beginning to end, improving work efficiency.

Furthermore, the press-fit is located between the rolled female thread and the tapered part on both sides of the hole, so it will not fall off, so there is no risk of the press-fit being lost, and the anchor can be installed easily and quickly. This has the effect that the operator can handle the product with peace of mind, which is extremely useful in practice.

[Brief explanation of the drawing]

FIG. 1 is a front view of one embodiment of the anchor manufactured according to the present invention, FIG. 2 is a front sectional view of the same, and FIG.
The figure is a front cross-sectional view of the anchor attached to a concrete wall, Figure 4 is a front cross-sectional view of the material after the forging of the same anchor has been completed, and Figures 5 to 10 show the process of forging the material. It is a front cross-sectional view showing the work shown. 1... Cylindrical body, 2... Hole, 3... Taper, 4...
...Press fit, 5... Female thread, 6... Peripheral groove, 7... Cut groove, 20... One side hole, 23... Other side hole.

Claims (1)

[Scope of Claims] 1. A method for manufacturing an anchor, characterized in that it is manufactured by the following steps. After forging a hole on one side in the axial direction on one side of the center of the round bar, a hole on the other side in the axial direction is forged on the other side, and the other side is extended outward toward the tip to form a thick wall shape. The first step is to form the After extruding the meat located between the holes on both sides into one hole to make a press-fit and making the holes on both sides communicate, the other side is press-fitted inward to make its outer circumferential surface redundant. The second step is to taper the other side of the hole with a small diameter tip. A female thread is installed on one side of the hole by rolling, a large number of unevenness is machined on the outer periphery of the other side, and several kerf grooves are machined in the axial direction parallel to each other at appropriate intervals on the other side. Third step.