JPH0327840A - Manufacture of collar for anchor - Google Patents

Abstract

PURPOSE:To reduce the manufacturing cost by performing cold forging by a punch having a square part in which an internal angle of a cross section is a right angle, forming plural deep grooves running along the axis on the inside peripheral surface of an end part of cylindrical steel, and forming a blade part. CONSTITUTION:A color for an anchor is manufactured by forming a blade part expanded at the time of using the collar in the end part of steel 10 formed in a cylindrical shape. In this state, cold forging is executed by using a punch 11 having a square part 11a in which an internal angle of a cross section is roughly a right angle. Subsequently, plural deep grooves 13 running along the axis are formed on the inside peripheral surface of an end part of the cylindrical steel 10. In such a way, the cylinder forming work and the deep groove forming work can be executed simultaneously in one process.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method of manufacturing an anchor collar.

[Prior art] This type of anchor collar is mainly made by cutting a welded pipe (a vibrator with vertical seams) to predetermined dimensions,
It is formed by a method such as forming a steel material into a cylindrical shape by cold forging. Anchor collars manufactured by these methods are provided with vanes at their ends that expand inside the object to be joined (for example, a lightweight concrete panel) and bite into the panel. As a conventional method for modifying the blade portion, a method has been adopted in which a slit is cut along the axis at the end of the main body of the collar.

[Problem to be solved by the invention] However, in the method of forming slits by cutting, f
Since the J-building process cannot be automated, processing is done by handffl
'j is necessary and time-consuming. Therefore, the manufacturing cost of the product increases.

In addition, a concept for forming the blade part by cold forging was published in Japanese Patent Application [16]
It is disclosed in Japanese Patent No. 3-207440.

However, with the technical means disclosed in the above-mentioned publication, the punch is damaged during the formation of the wing portion due to the hardening of the workpiece due to cold forging, making it practically difficult or impossible to implement.

This invention is 4i! It is an object of the present invention to solve the above-mentioned problems by employing a process of performing cold forging using a punch whose cross section has an approximately right-angled internal angle.

[Means for Solving the Problems 1] In order to solve the above problems, the present invention includes a step of shaping a steel material into a cylindrical shape, and forming a wing part at the end of the cylindrical steel material to be expanded when using a collar. In the method for manufacturing an anchor collar, the step of forming the wing portion includes forming the cylindrical shape by performing cold forging using a punch having a corner portion whose cross section has an approximately right angle. It is characterized by forming a plurality of deep grooves along the axis on the inner circumferential surface of the end of the steel material.

[Function] In the step of forming the blade portion, a punch having a corner portion whose internal angle of the cross section is approximately a right angle is used (this corner portion forms a plurality of 21 grooves on the inner circumferential surface of the cylindrical steel material).

Since this deep groove is along the axis of the steel material, the end of the cylindrical steel material acts as a vane that expands radially outward when the deep groove is torn during use.

[Example] Fig. 1 shows a process of forming a cylindrical steel material 10 into a cylindrical shape by conventional cold forging. 11 is a punch made of steel material 10, and 12 is a die. And these punch 11,
The steel material 10 is formed into a cylindrical shape by setting the die 12 in a machine tool such as a press or a former, and further setting the steel material 10 in the die 12 and performing cold forging (hereinafter referred to as "former processing"). . The material of the steel material 10 is as follows:
General structural rolled steel (so-called SS material) will be used. 1
0a is a discarded shaft and is removed in the final process.

Here, as shown in FIG. 2, the cross section of the punch 11 is
The portion facing the front end of the steel material 10 is formed into a +E square shape, and each corner portion 11a is heat treated. As shown in the figure, the dimensions of the punch 11 are set so that the corner portion 11a bites into the inner circumferential surface of the steel material 10. As a result, in the forming process explained in FIG. 1, the steel material 10 is formed into a cylindrical shape, and at the same time, four deep grooves 13 extending in the axial direction are formed at the inner circumferential edges of the steel material 10.

The deep groove 13 performs the same function as the slit of conventional products during use, and as shown in the upper right of Fig. 2,
The wall thickness t of the steel material 10 in which the deep groove 13 is formed is approximately O.
It has a thin appearance similar to IS.

The number of deep grooves 13 formed is generally four, but the number of corner parts 11a may be changed to two deep grooves 13, or the number of deep grooves 13 may be changed to two.
You can make it 6 pieces. Note that the third cross section of the bandage 11 is
As shown in the figure, the corners 11a and 118 adjacent to each other are provided with a concave curved surface 11b, and as shown in FIG. You may adopt the thing provided with 11 C of uneven surfaces. When the shape shown in FIG. 3 is adopted, the minimum value of the radius R of the circular arc constituting the four-curved surface 1lb is 120 #ll.

Next, as shown in FIG. 5, the sacrificial shaft 10a is removed by pressing or the like, and a female thread 14 is screwed in using a tap 14, as shown in FIG. Further, by low left machining, a groove 16 extending in the axial direction of the steel material 10 is carved on the outer periphery of the front end portion of the rR material 10.

Thereby, the steel 010 constitutes the anchor collar.

FIG. 7 shows the state of use of the anchor collar completed according to the present invention. As shown in the diagram, during use,
The deep grooves 13 of the steel material 10 are torn, and the ends of the steel material 10 form vanes 20 that expand outward in the radial direction. Further, in this embodiment, since the deep groove 16 is formed, the deep groove 13 is easily torn apart during expansion. Furthermore, the special application was made in 1986-24.
No. 4989 and Utility Application No. 6 2-4 4 5 9 5
3 describes in detail how the anchor formed according to the present invention is used.

By adopting the above process, when forming the cylindrical steel material 10 that will become the main body of the anchor collar, it is possible to simultaneously form the deep hole 13 that has the same effect as the slit in conventional products, reducing manufacturing PI. , production efficiency can be improved.

[Effects of Intervention] As explained above, according to the present invention, the end portion of the cylindrical steel material 10 is formed by performing former processing using the punch 11 whose cross section has an angle i1 1 1 a that is approximately a right angle. Since it is characterized by forming a plurality of deep grooves 13 along the axis on the inner circumferential surface, there is no need for IM cutting as in the conventional method. Therefore, it is possible to reduce the number of man-hours, and manufacturing costs can be reduced. In particular, as explained in the example, if the punch 11 used to form the steel material 10 into a cylindrical shape is used as a punch to form the deep mantle 13, it will be possible to simultaneously form the cylindrical shape in about 1 inch. Deep groove forming work can be performed, further improving production efficiency. In addition, the present invention uses a punch 11 that punches the corner portion 11a whose internal angle is approximately right angle in cross section for 44 degrees to form the ff! Since it can be carried out on il1, the processing machine can be used as is by simply changing the conventional bandage-4
It has the advantage of being able to do a lot of things. In addition, since the bunch 11 is arranged such that the internal angle of the cross section is right at the corner 11a, the punch 11 will not become out of shape even if the steel material 10 hardens during forming.

Please put this invention into practice! -Formerization is added at the end.
A deep groove may be formed by forming the cylindrical shape 1110. Alternatively, a vibrator that has been formed into a cylindrical shape by stagnation processing may be cut to a predetermined size and then subjected to forma processing. If the wall thickness is sufficiently thick, a so-called welded pipe formed by rolling a plate-shaped steel material into a cylindrical shape may be used.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of the present invention, Fig. 2 is a cross-sectional view of the punch of the present invention, Fig. 3 is a cross-sectional view showing another embodiment of the punch of the present invention, and Fig. 4 is a cross-sectional view of the punch of the present invention. 5 and 6 are schematic sectional views showing other steps of the present invention, and FIG. 7 is a sectional view showing an example of use of the anchor collar manufactured according to the present invention. This is a diagram. DESCRIPTION OF SYMBOLS 10... Steel material, 11... Punch, 11a... Corner part, 13...
Deep groove, 20... vane part

Claims (1)

[Claims] In a method for manufacturing an anchor collar comprising a step of forming a steel material into a cylindrical shape and a step of forming a wing portion that expands when the collar is used at the end of the cylindrical steel material, the step of forming the wing portion includes the steps of: , characterized in that a plurality of deep grooves are formed along the axis on the inner circumferential surface of the end of the cylindrical steel material by performing cold forging using a punch having a corner portion whose cross section has an approximately right angle. Method of manufacturing anchor collars.