TWI744198B - Internally forced expansion anchor bolt manufacturing method - Google Patents

Abstract

The present invention discloses a method for manufacturing an internally forced expansion anchor bolt, which includes blank shaping, punching bar center positioning, cross groove extrusion molding, molding large holes and beam tails, molding small holes, iron shavings, molding taper holes, and internal teeth Molding and other steps. The main purpose is to gradually shape the blank into an internally forced expansion anchor through a stamping method. The integral forming step does not require a sawing method to form the petals, but a continuous stamping method to achieve the purpose of forming.

Description

Internally forced expansion anchor bolt manufacturing method

The invention relates to an expansion anchor, in particular to a manufacturing method of an internally forced expansion anchor.

Press, please refer to the internally forced expansion anchor structure shown in FIGS. 1 and 2, which includes an expansion anchor body 10. One end of the expansion anchor body 10 is a lock-in end 11, and the other end is a plug-in end 12. The plug-in end 12 is extended with a plurality of slits 13, so that the plug-in end 12 is divided into a plurality of petals 14; The expansion anchor body 10 is hollow, with a section of internal thread 15 extending inward from the locking end 11, and an oblique cone hole 16 adjacent to the internal thread 15, the oblique cone hole 16 tapers toward the insertion end 12 design. During implementation, a hole is drilled on a wall surface for the insertion end 12 of the expansion anchor body 10 to penetrate, and then a tapered block A is inserted from the locking end 11 so that it is clamped in front of the oblique taper hole 16 , Since the surface of the cone block A has a cone surface that matches the oblique cone hole 16, a jig (not shown in the figure) can be used to push the cone block A, and the cone block A can be pushed forward to move The petals 14 are deformed to expand outward, so that the petals 14 expand and bite into the hole, and the expansion anchor body 10 is embedded in the wall surface, and the internal thread 15 in the locking end 11 can be used for anchoring. The bolt locks to complete the installation and use of the internally forced expansion anchor.

However, it is found that the aforementioned conventional internally forced expansion anchor has its shortcomings during manufacture. The manufacturing method and shortcomings are summarized as follows: When the conventional internally forced expansion anchor is manufactured, a blank is taken, and it is repeated many times. The punching method makes it form a hollow tube body, which is punched out inside the tube body After the oblique taper hole 16 is tapped, the internal thread 15 is tapped, and finally a cross-shaped slit 13 is sawed by sawing, so that one end is divided into a plurality of petals 14. Therefore, in the manufacturing process of the conventional internally forced expansion anchor, two processes of stamping and sawing are used. In addition to the inconsistency of the manufacturing process and the trouble of program separation, the cross-shaped slot 13 needs to be used twice. The sawing method is relatively time-consuming and labor-intensive, which is not conducive to the quantification of the product.

In fact, the inventor of the present case has conducted an in-depth discussion on the aforementioned conventional internally forced expansion anchor manufacturing technology field, and then, based on years of rich experience in design and development and actual production in related industries, aimed at the imperfections in this field. After a long time of thinking and designing the present invention, a more ideal effect can be achieved.

The main purpose of the present invention is to improve the problem that the conventional internally forced expansion anchor manufacturing technology is not ideal, and then provides a method for manufacturing the internally forced expansion anchor, so that the internally forced expansion can be completed in a continuous stamping step. The production of anchor bolts further contributes to the purpose of improving manufacturing efficiency.

In order to achieve the above-mentioned purpose, the specific method of this case is: a method for manufacturing an internally forced expansion anchor, through: blank shaping, punching bar center positioning, cross groove extrusion forming, forming large holes and tails, forming small holes, Through iron filings, forming taper holes, internal teeth forming, etc., the blank material is shaped and the central axis is set, and then the cross-shaped groove is formed by punching, and then the large holes and small holes are punched to make the blank material form a hollow tube. After the body, the waste material between the large hole and the small hole is punched, and the small hole is formed into a tapered hole, and finally the inner wall of the large hole is tapped to form an internal thread.

The invention is gradually formed into an internally forced expansion anchor through a stamping means, and the integral forming step does not need to use a sawing method to form the petals, but a continuous stamping means achieves the purpose of forming.

"Learning part"

10: Expansion anchor body

11: Lock in the end

12: Insert the end

13: cut groove

14: flap

15: Internal thread

16: Oblique cone hole

A: Cone block

"Part of the case"

20: Blank

21: The first stamping end

22: The second internal forced end

23: Shallow groove

24: groove

25: big hole

26: beam tail

27: small hole

28: tapered hole

29: Internal thread

30: Internally forced expansion anchor

31: Lock in the end

32: Insert the end

33: cut groove

34: flap

Figure 1 is a three-dimensional structural view of the conventional internally forced expansion anchor; Figure 2 is a sectional structural view of the conventional internally forced expansion anchor; Figure 3 is a schematic view of the manufacturing steps of the present invention (1); 4 is a schematic diagram of the manufacturing steps of the present invention (2); Figure 5 is a schematic diagram of the manufacturing steps of the present invention (3); Figure 6 is a schematic diagram of the manufacturing steps of the present invention (4); Figure 7 is a schematic diagram of the manufacturing steps of the present invention Schematic diagram (5); Figure 8 is a schematic diagram of the manufacturing steps of the present invention (6); Figure 9 is a schematic diagram of the manufacturing steps of the present invention (7); Figure 10 is a schematic diagram of the manufacturing steps of the present invention (8); Shows the three-dimensional structure diagram of the present invention.

The technical content, features, and effects of the present invention will be clearly presented in the following detailed description of the preferred embodiments with reference to the drawings. In addition, before the case is described in detail, special explanation is needed. The attached drawings illustrate the basic steps of the case in a schematic manner. Therefore, only the structures related to the case are shown in the drawings, and the shown The shown shape, size, ratio, or related number, etc., are an optional design; it is stated first.

Please refer to the schematic diagrams of the manufacturing steps of the present invention shown in FIGS. 3-10. The present invention is a method for manufacturing an internally forced expansion anchor, which includes step one: blank shaping, step two: punching bar center positioning, and step three: Cross groove extrusion forming, step 4: forming large holes and beam tails, step 5: forming small holes, step 6: iron shavings, step 7: forming taper holes, step 8: forming internal teeth; among them: as shown in Figure 3 It is shown that the first step is blank shaping, and a blank 20 of a predetermined length and diameter is taken. The blank 20 defines one end as the first stamping end 21 and the other end as the second inner forced end 22.

As shown in Figure 4, the second step is the positioning of the center of the punching rod. The first punching end 21 of the blank 20 is punched and positioned, and a shallow groove 23 is formed at the first punching end to mark the center position and ensure The subsequent punching of the punching rod is on the same central axis.

As shown in Figure 5, the third step is cross groove extrusion molding. The second internal forced end 22 of the blank 20 is internally compressed with a cross-shaped mold, so that the second internal forced end 22 of the blank 20 faces A cross-shaped groove 24 with a predetermined depth is formed therein.

As shown in Figure 6, the fourth step is to form large holes and beam tails. The large holes 25 are punched inwardly at the shallow grooves 23 of the first punched end 21 of the blank 20, and the large holes 25 are punched on the outside of the second inner forced end 22. The rim forms a beam tail 26. At this time, the cross-shaped groove 24 is squeezed by the material when the large hole 25 is punched, so that the pitch of the groove 24 is squeezed and reduced, but the gap is still maintained.

As shown in FIG. 7, the fifth step is to form a small hole, punch the small hole 27 in the second inner forced end 22 to make the inner side of the second inner forced end 22 repair the shape.

As shown in FIG. 8, the sixth step is to pass the iron filings, and the gap between the large hole 25 and the small hole 27 is opened by a punching rod, so that the blank 20 is formed into a hollow tubular body.

As shown in FIG. 9, the seventh step is to form a taper hole, punch a taper rod from the second inner forced end 22, so that the small hole 27 forms a tapered hole 28 with a small outer diameter and a larger inner diameter.

As shown in Figure 10, the eighth step is forming the internal teeth. The large hole 25 is tapped with a tapping device to form an internal thread 29, thereby completing the forming work of the internally forced expansion anchor 30 (as shown in Figure 11). Show).

According to the above manufacturing method, the internally forced expansion anchor 30 of the present invention passes through: blank shaping, punching bar center positioning, cross groove extrusion forming, forming large holes and beam tails, forming small holes, iron shavings, and forming taper holes , In the step of forming the inner teeth, the blank 20 is gradually formed into an internally forced expansion anchor through the stamping technology; it is worth mentioning that the present invention specifically undergoes the cross groove extrusion forming in step 3, so that the blank 20 is in the second The inwardly forced end 22 forms a cross-shaped groove 24 with a predetermined depth inward. The material deformation is used cleverly to form a cross-shaped groove on the blank 20. After the expansion anchor is formed, the cross-shaped groove is formed The slot is cut so that one end of the hollow expansion anchor is divided into a plurality of petals.

After the internally forced expansion anchor 30 of the present invention is formed, one end is the lock-in end 31 (that is, the first stamping end 21 in the blank 20 state), and the other end is the plug-in end 32 (that is, the blank 20 state) The second inner forced end 22) extends from the inserted end 32 with a plurality of slits 33 (that is, the cross-shaped groove 24 in the state of the blank 20), so that the inserted end 32 is divided into a plurality of petals 34; The internally forced expansion anchor 30 is hollow, with a section of internal thread 29 extending inward from the locking end 31, and a tapered hole 28 adjacent to the internal thread 29.

Therefore, the molding of the present invention does not need to use a sawing method to form the petals 34, but a continuous stamping method is used to achieve the purpose of molding, so that it can be in a continuous stamping step. Immediately, the manufacture of the internally forced expansion anchor 30 is completed, which in turn helps to improve the efficiency of product manufacturing.

In summary, according to the manufacturing method of the present invention, the purpose of the invention can be achieved. However, the structural content of the above-mentioned elements is only used to explain the preferred embodiments of the present invention, and is not a limitation to the structure of the present invention. Equivalent modifications or changes made under the same spirit should still be included in the protection scope of the present invention. From the above, the invention in this case has many advantages and significant practical characteristics, and the technical means used and its manufacturing method are indeed developed by the inventor of the case. Since the invention has met the requirements of the patent, Yan filed an application in accordance with the law and prayed for the patent right.

29: Internal thread

30: Internally forced expansion anchor

31: Lock in the end

32: Insert the end

33: cut groove

34: flap

Claims (1)

An internally forced expansion anchor bolt manufacturing method, including step 1: blank shaping, step 2: punching bar center positioning, step 3: cross groove extrusion forming, step 4: forming large holes and beam tails, step 5: forming small Hole, step 6: iron scraps, step 7: forming a taper hole, step 8: forming the inner teeth; the blank shaping in step 1 is to take a blank of a predetermined length and diameter, and the blank defines one end as the first One punching end, the other end is the second inner forced end; the positioning of the stamping bar mark center of the second step is to perform punching positioning on the first punching end of the blank, and a shallow groove is formed at the first punching end; the third step is Cross-groove extrusion molding is performed on the second inner forced end of the blank with a cross-shaped mold to form a cross-shaped groove with a predetermined depth inward from the second inner forced end of the blank; step four The forming large hole and the tail of the blank are punched inward at the shallow groove of the first punching end of the blank, and the beam tail is formed at the outer edge of the second inner forcing end; the forming small hole of the fifth step is in the second The inner forced end punches a small hole inward, so that the inner side of the second inner forced end is repaired; in this step, the iron filing system uses a punch to open the gap between the large hole and the small hole , Make the billet into a hollow tubular body; the forming taper hole of this step 7 is to punch a taper rod from the second inner forced end to make the small hole form a tapered hole with a small outer diameter and a large inner diameter; this step 8 The internal thread forming system uses a tapping device to tap the large hole to form an internal thread, thereby completing the forming work of the internally forced expansion anchor.

Images