KR101286304B1 - Sheet manufacturing method of t-bolt - Google Patents

Abstract

PURPOSE: A T-bolt sheet manufacturing method is provided to prevent damage of a boundary between a bolt connection unit and a latching projection by forming a T-bolt without thermal deformation. CONSTITUTION: A T-bolt sheet (1) manufacturing method comprises the following steps. A basic material is made by cutting a round bar type steel material into a fixed length while the round bar steel type material (10) is continuously supplied. A bottom unit is formed by inputting the cut base material into a molding groove of a first mold die, and by using a first punch to pressurize the cut base material to have a locating hole in the center (12a). The base material is molded into a first semi-finished product (12) which has a bolt connection unit and a latching projection that are partitioned on the upper part. The first semi-finished product is put into a molding groove of a second mold die, and pressurized by a second punch to be formed with a bolt connection unit and a latching projection on the upper part. A second semi-finished product (12') is molded by forming a locating hole (12b) the center of the bolt connection unit. A bolt assembly hole (4) passes through the center of the bolt connection unit of the second semi-finished product. [Reference numerals] (AA) Cutting; (BB) First forging; (CC) Second forging; (DD) Piercing

Description

Sheet manufacturing method of T-bolt

The present invention relates to a method for manufacturing a sheet of Tibolt, which is used throughout the industry, and more particularly, by manufacturing the round bar by cold forging after cutting, to shorten manufacturing time, reduce costs, and to control product quality and durability. Another object of the present invention is to provide a method for manufacturing a sheet of Tibolt, which can be improved.

Tibolt is used for a variety of applications used throughout the industry.

In the case of the T-bolt is formed so that the structure can be caught by forming a locking step on the bolt head of the rear end of the screw rod, there are a variety of prior art.

As a representative example, a forging device for manufacturing a slot slot bolt of the Republic of Korea Patent Publication (B1) 10-0965306 (2010.06.22.) Is disclosed, the configuration of the support block forming groove is located in both the upper mold and the lower mold. In addition, by placing a separate dedicated space for accommodating the molding flash on the opposite surface of the upper and lower molds, it is possible to disperse the compressive load generated during forging, so wear does not easily occur long life and in particular not to generate a burr.

In the above technique, the male screw rod is inserted into the through-hole formed in the lower mold, and when the upper part of the male screw rod exposed to the upper side of the lower mold is forged into the upper mold, the male screw is formed in the dedicated space formed in the lower mold and the upper mold. As the end of the rod is forged, the support block and the guide block can be forged.

As another example, a method for manufacturing stud bolts of Korean Patent Publication No. 10-0899479 (2009.05.26.) Is disclosed.

The manufacturing method of the stud bolt includes the step of inserting and fixing the linear steel in the passage of the annular forging die having a circular space formed on the inlet side of the passage, the linear steel is hit by the hammer disposed facing the annular forging die And forming an annular plate in a circular space, and forming a bolt head by inserting a linear steel material having an annular plate formed in a bolt head forging die formed at a lower portion of the hammer and having a bolt head groove for forming a bolt head. And a step of moving a spherical space forging one side of the linear steel having a bolt head formed into a circular sphere to face the circular sphere forging die formed therein, and punching the other side of the linear steel fitted to the circular forging die. By pressing by forming the one side of the linear steel into a circular sphere by the forging of several steps In and to be able to easily form the stud bolt used to secure the back door.

As another example, a method of manufacturing a bolt head and a bolt head forging apparatus for the same are disclosed in Korean Patent Publication No. 10-0873377 (2008.12.11.).

In this bolt head manufacturing method, after moving the moving part such that the first punch is positioned above the second dice, the moving part is lowered to preform the head of the bolt fixed to the second dice with the first punch. After the first step, and after the first step to move the moving unit so that the first punch is located on top of the first dice and the second punch is located on top of the second dice, And a second step of preforming the head of the bolt fixed to the first dice with the first punch while completely lowering the head of the bolt fixed to the second dice with the second punch. Composition;

After moving the moving part such that the second punch is located above the first dice after the second process, the moving part is lowered to completely form the head of the bolt fixed to the first dice with the second punch. It consists of the structure which further contains a 3rd process.

Another example discloses a bolt head forming apparatus and a forming method by cold working of the Republic of Korea Patent Publication (A) 10-2005-0029859 (2005.03.29.), The manufacturing method of the rod-shaped material on one side Molding the roll processing part by a lathe; Mounting the material with a lower mold having a space for forming a bolt head at the top thereof and having a hole having a two-stage diameter at the center, and forming a circular head portion at the top of the material by hitting the upper mold vertically descending; Forging the head to complete the hexagonal bolt head; It is made to be completed as a process of forming the screw part by rolling the said roll processing part.

All of the linear techniques described above use a terminal mold to integrally form the head at one end or the middle part of the screw rod, but the size of the head (the portion corresponding to the sheet for the tibolt) is large. There is no.

However, when the head is large, it is formed to be separated from the screw rod, in the case of the separated head is usually formed by hot forging method using an iron plate in consideration of forging properties.

However, when the head is formed by hot forging, the boundary between the guide part and the support part coupled with the screw rod is thermally deformed, which causes the durability to be deteriorated. In addition, there was a problem that the manufacturing cost is also increased, the industry has been in need of a new manufacturing method that can solve this problem.

KR 100965306 B1 2010.06.22. KR 100899479 B1 2009.05.26. KR 100873377 B1 2008.12.11. KR 1020050029859 A 2005.03.29.

Therefore, the present inventors have studied and developed the present invention to solve the problems of the conventional T-bolt sheet manufacturing method. In the present invention, the round bar is manufactured by a method of cold forging after cutting, thereby shortening the manufacturing time and reducing the cost. The present invention has been completed with technical problems in providing a method for manufacturing a sheet of Tibolt capable of quality control of products and improving durability.

In the present invention as a problem solving means in the sheet manufacturing method for Tibolt;

A cutting step of cutting a predetermined length while continuously supplying a round bar type steel in an axial direction (length direction); Rotate the cut base material in the direction perpendicular to the axial direction and put it into the molding groove of the first mold and press with the first punch so that the bolt coupling part and the locking jaw are partitioned at the top together with the bottom part formed with the slot groove formed at the center. A first forging step of molding the semi-finished product; The first semi-finished product, which has undergone the first forging process, is placed in the molding groove of the second mold and pressed with a second punch to form the bolt coupling part and the locking jaw in the design dimension on the upper part, and to form a recess groove in the center of the bolt coupling part. A second forging step of molding the secondary semi-finished product; The secondary semi-finished product, which has undergone the second forging process, is put into the third mold and pressed into the third mold, and the punch pin installed in the third mold is inserted into the dig groove formed in the center of the bolt coupling part to penetrate the bolt assembly hole. It was made possible by the piercing process.

Tibolt sheet manufacturing method provided by the present invention is that the entire process can be carried out continuously in a batch at room temperature, it can minimize the loss of material, can significantly reduce the manufacturing time cost effect can be expected There is.

In addition, according to the present invention, it is easy to control the quality of the product, and in particular, since the molding is performed without thermal deformation, problems such as breakage of the boundary between the bolt coupling part and the locking jaw due to the shear force can be eliminated, so durability can be expected to be improved. It is.

1 is a process block diagram according to the method for manufacturing a sheet of Tibolt provided by the present invention
Figure 2 is a schematic cross-sectional view of the molds for producing the sheet for Tibolt provided by the present invention.
Figure 3 is a cross-sectional view of the Tibolt completed by assembling the bolt to the Tibolt sheet manufactured in the present invention

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment according to a method for manufacturing a sheet of Tibolt provided by the present invention will be described with reference to the accompanying drawings.

1 is a block diagram illustrating a process for manufacturing a sheet of Tibolt provided by the present invention, and FIG. 2 is a schematic cross-sectional view of molds for manufacturing a sheet for Tibolt provided by the present invention.

 It is characterized in that the sheet formed by conventional hot forging can be made by cold forging at room temperature.

When cold forging at room temperature, it can be molded without changing the structure of the material, and can be mass produced in a short time as in general press processing.

In the present invention, a method for manufacturing a sheet of Tibolt is to prepare a sheet for Tibolt by sequentially performing 1) cutting process, 2) first forging process, 3) second forging process, and 4) piercing process. The manufacturing method of this invention is demonstrated more concretely.

1) Cutting process

The present invention is manufactured by using the round bar-type steel material 10, and is cut into a predetermined length while continuously supplying the round bar-type steel material 10 which is wound and supplied in a roll type in the axial direction (length direction).

As a preferred example, the feed guide 20 is arranged by placing a cutting blade 22 pressurized in the axially perpendicular direction in front of the feed guide 20 in which the feed hole 21 through which the round bar-type steel 10 passes is formed. Press the steel material 10 exposed to the outside of the supply hole 21 to be cut.

2) First forging process

The first forging step further includes a preparation step of inserting the base material 11 to be cut and provided in the above cutting step into the mold.

When the round bar supplied in the preparation process is in a direction perpendicular to the forming groove 31 of the first mold 30, the cut base material 11 is supplied to be rotated 90 degrees, and the base material 11 is The supply can be made by tilting clamping means of various configurations.

Meanwhile, in the first forging process of the present invention, the base metal 11 embedded in the first mold 30 and the molding groove 31 of the first mold 30 are formed with the molding groove 31 on which the base material 11 is placed. It is made by the combination of the 1st punch 33 to pressurize.

In the center of the forming groove 31 formed in the first mold 30 is further formed a groove 32 in which the bolt coupling portion 2 is formed, the separation pin 34 is coupled to the groove 32 The primary semi-finished product 12 can be separated from the forming groove (31).

The first punch 33 is formed into the molding groove 31, the protrusion 33a is formed in the center to press the base material 11 to the first punch 33 when the primary semi-finished product 12 At the bottom of the) it is possible to have the functionality to mold the grooves (12a).

When the first punch 33 is pressed into the molding groove 31 of the first mold 30, the base material 11 is cold-forged for the first time and the bolt coupling part together with the bolt coupling part 2 of the upper center. (2) Temporary molding of the locking step 3 having a lower height is partitioned.

The first forging step of the present invention is a step of allowing molding to a coarse dimension without providing precise dimensions.

3) 3rd forging process

The second forging process is a step of precisely molding the bolt coupling part 2 and the locking step 3 formed in the schematic dimensions as described above to the design state, and the molding groove 41 in which the primary semi-finished product 12 is placed. ) Is formed by a combination of the second mold 40 and the second punch 43 for pressing the primary semi-finished product 12 embedded in the molding groove 41 of the second mold 40.

In the second mold 40, as in the first mold 30, a groove 42 for forming the bolt coupling portion 2 is formed in the center of the molding groove 41, and the groove 42 is recessed. In the center of the crest protrusion 42a is formed to protrude upwards, and the separation pin 44 is coupled to the center thereof so that the secondary semi-finished product 12 'can be separated from the forming groove 41. . As such, when the locating protrusion 42a is formed to protrude upward in the center of the groove 42, the locating groove 12b is simultaneously formed in the center of the bolt coupling part 2 in a forged state. .

In addition, the second punch 43 is configured to be inserted into the forming groove 41, and is configured such that the protrusion 43a is formed at the center like the first punch 33.

The second mold 40 and the second punch 43 of the present invention as described above is to perform the process of cold forging the secondary semi-finished product 12 ′ in the dimensions corresponding to the outer shape of the Tibolt sheet (1).

4) Piercing Process

The piercing process is a process of vertically penetrating the bolt assembly hole 4 in the center of the bolt coupling part 2 in the secondary semi-finished product 12 'of the Tibolt sheet 1 formed by the first and second forging processes.

The piercing process includes the third mold 50 having the settling groove 51 in which the second semifinished product 12 'is placed and the second semifinished product 12' embedded in the settling groove 51 of the third mold 50. It is made by the combination of the third punch 54 to pressurize.

In the settling groove 51 of the third mold 50, a punch pin 52 penetrating the bolt assembly hole 4 through the center of the bolt coupling portion 2 is coupled to the center of the separation pin 53, The center of the third punch 54 is made of a configuration in which the discharge hole (54a) is formed.

On the other hand, in the case of the present invention can be continuously produced in a batch by a forging press, the tilting clamping means for rotating the base material 11 to be provided in the cutting process in the direction perpendicular to the axial direction and then inserted into the mold, the first forging process Clamping means for supplying the primary semi-finished product 12 formed in the second die 40 of the second forging process and the secondary semi-finished product 12 'molded in the second forging process the third mold 50 of the piercing process The clamping means to be fed to) should be arranged in parallel so that they can be operated collectively.

The tilting clamping means and the clamping means can be made in a variety of configurations in the present invention does not show a specific example for these.

In the case of the Ti-bolt sheet 1 manufactured by cold forging at room temperature by the continuous process as described above, assembling the bolt 5 into the bolt assembly hole 4 from the bottom portion 1a side as shown in FIG. After that, the surface of the bolt head 5a and the bottom portion 1a of the present invention are welded to each other and the surface plating is performed to complete the tibolt 6 and use it.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. Therefore, the scope of protection of the present invention should not be limited to the described embodiment, but should be determined by the equivalents as well as the claims that follow.

1: T-bolt sheet 1a: bottom
2: bolt coupling part 3: catching jaw
4: Bolt assembly hole 5: Bolt
5a: Bolt head 6: T-bolt
10: steel 11: base material
12,12 ': Primary and secondary semi-finished products 12a, 12b: Slotted groove
20: supply guide 21: supply hole
22: cutting day 30: the first mold
31: molding groove 32: groove
33: first punch 33a: protrusion
34: separation pin 40: second mold
41: molding groove 42: groove
42a: perforation 43: second punch
43a: protrusion 44: release pin
50: third mold 51: settling groove
52: Punch Pin 53: Release Pin
54: third punch 54a: discharge hole

Claims (1)

A method for producing a sheet for tibolt;
A cutting step of cutting the steel bar 10 of the round bar type in a predetermined length while continuously supplying the steel bar 10 in the axial direction (length direction);
The cut base material 11 is inserted into the forming groove 31 of the first mold 30 and pressurized with the first punch 33 to form the bottom portion 1a having the recess groove 12a formed at the center thereof. A first forging step of forming the primary semi-finished product 12 so as to partition the bolt coupling portion 2 and the locking step 3;
The first semi-finished product 12, which has undergone the first forging process, is placed in the forming groove 41 of the second mold 40 and pressed with the second punch 43 to be bolted to the upper portion 2 and the locking jaw (3). A second forging process of molding the secondary semi-finished product 12 'by forming a recessed groove 12b in the center of the bolt coupling part 2, and molding it to a design dimension;
Put the secondary semi-finished product 12 ′ subjected to the second forging process into the third mold 50 and bolted to the punch pin 52 installed in the third mold 50 while being pressed by the third punch 54. A method for manufacturing a sheet for tibolts, comprising a piercing process for penetrating a bolt assembly hole (4) while being inserted into a dent groove (12b) formed in the center of (2).

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