KR101359114B1 - Apparatus and Method for manufacturing high carbon steel - Google Patents

Abstract

High-carbon steel wire manufacturing apparatus according to the present invention, the cryogenic cooling unit for cooling the material in a cryogenic state; And a shear draw part that is fresh while giving shear deformation to the material in connection with a rear end of the cryogenic cooling unit to impart shear deformation immediately after cooling the material to cryogenic temperature to reinforce the torsion characteristics of the material.
As described above, the present invention provides a cryogenic cooling unit for cooling the material in a cryogenic state to impart a shear deformation immediately after cooling the material to cryogenic temperature, and to strengthen the torsional characteristics of the material, and to draw fresh shearing material while applying a shear deformation to the material. In addition, the torsional characteristics of the material can be reinforced significantly by simple equipment specifications.

Description

Apparatus and Method for manufacturing high carbon steel}

The present invention relates to a high carbon steel wire manufacturing apparatus and a manufacturing method, and to a high carbon steel wire manufacturing apparatus and manufacturing method for enhancing the torsion characteristics of the material.

The torsional properties of high carbon steel wires are used as indicators of ductility as important material properties in various steel types such as tirecord, bridge cable, and bead wire.

In order to increase the strength of the wire rod, when a large amount of reduction amount is given through cold drawing, generally ductility, that is, torsional characteristic is deteriorated, so that delamination (a phenomenon in which the steel wire is broken in a spiral shape when twisting) occurs.

Also, in the case of high carbon steel wire, a plurality of strands are twisted and stranded to form a bundle. When the ductility is poor, the bundle characteristics are deteriorated.

On the other hand, the cause of the delamination is variously analyzed, but the cause of the delamination has not been found yet.

When the temperature rises to 150 ° C during the drawing process, carbon reutilization occurs and the strain aging is affected.

It is reported that the texture generated in the longitudinal direction of the material during drawing is related to delamination.

To avoid this, it is reported that pearlite transformation is caused near the nose of the phase change, and the incubation time before the transformation is minimized.

However, since the cold drawn reduction ratio is generally more than 90% and the reduction is continuously performed in a circular shape without changing the shape, the deviation of the strain on the surface and the inside can not be prevented, and the developed texture is different.

As a result, cracks propagate at the interface and can be developed into final delamination.

In the drawing process of the tire cord wire, there is a difference in calorific value due to the setting of the pass schedule, and the delamination characteristic is different. In the drawing process, the heating value is calculated by simulation, There are also research results that suppress the occurrence.

As described above, in the process of manufacturing a high carbon steel wire, there has been actively conducted research to improve the torsional characteristics in order to suppress the occurrence of delamination in the process of using the manufactured high carbon steel wire.

The present invention has been made to solve the above problems, the object of the present invention is to provide a high-carbon steel wire manufacturing apparatus and a manufacturing method for enhancing the torsional characteristics of the material by giving a shear deformation immediately after cooling the material to cryogenic temperature have.

delete

High carbon steel wire manufacturing apparatus according to a preferred embodiment of the present invention to achieve the above object, the cryogenic cooling unit for cooling the material in a cryogenic state; And a shear draw part which is fresh while giving shear deformation to the material in connection with a rear end of the cryogenic cooling part to impart shear deformation immediately after cooling the material to cryogenic temperature to enhance the torsion characteristics of the material. The front wire drawing part, the rolling roll disposed at the rear end of the cryogenic cooling unit; And a shear dice disposed at a rear end of the rolling roll and having a shear hole formed therein. Here, the shear hole has at least one bent portion, it is preferable that the shear strain of the material that is sheared while passing through the shear hole is configured to be an effective strain of 2.0 or more.

At this time, the shear hole of the shear dice, the bending angle of the bending portion is preferably 120 ° ~ 150 °.

In addition, the shear holes of the shear dice are sequentially connected by bending the first line, the second line, the third line, the fourth line, and the fifth line, and the first line, the third line, and the fifth line. The line extends to a length of three times or more and five times or less of the shear hole diameter, and the second line and the fourth line preferably extend to a length of two times or more and three times or less of the shear hole diameter.

The present invention may further include a calibration die disposed at a rear end of the shear die and having a calibration hole formed to correct a cross-sectional shape of the material to be passed to a final standard shape.

The present invention may further include a calibration roller unit disposed at the front end of the cryogenic cooling unit to guide and calibrate the material to be introduced into the cryogenic cooling unit. The calibration roller unit may further include a calibration roller unit for vertical calibration. It is preferable to have a horizontal roll and a vertical roll for horizontal calibration.

Here, the material is a wire rod, the rolling roll is provided with a ball roll, the shear hole of the shear die is preferably the same cross-sectional area along the longitudinal direction.

delete

delete

delete

The apparatus and method for manufacturing a high carbon steel wire according to the present invention include a cryogenic cooling unit for cooling a material in a cryogenic state to impart a shear deformation immediately after cooling the material to cryogenic temperature, and to strengthen the torsion characteristics of the material. By providing shear deformation and connecting the shear draw wire is connected, it has the effect of reinforcing the torsion characteristics of the material significantly even with simple equipment specifications.

1 is a view showing a high carbon steel wire manufacturing apparatus according to a preferred embodiment of the present invention.
FIG. 2 is a view illustrating the inside of a shear die in the shear drawing unit in the high carbon steel wire manufacturing apparatus of FIG. 1.
Figure 3 is a view showing the temperature of the material with time, when manufacturing a high carbon steel wire by the high carbon steel wire manufacturing apparatus of FIG.
Figure 4 is a microstructure of the material processed by the conventional method at room temperature, and the material processed at cryogenic temperatures with the high carbon steel wire manufacturing apparatus of Figure 1 by an electron microscope.

The present invention provides a cryogenic cooling unit for cooling the material in a cryogenic state to give a shear deformation immediately after cooling the material to cryogenic temperature, and to strengthen the torsion characteristics of the material, and a shear fresh portion that is fresh while giving a shear deformation to the material. It is a technical feature to reinforce the torsion characteristic of a material remarkably even by simple installation specifications.

That is, the present invention enhances the twisting property of the material so that the shear deformation is applied immediately after the material is cooled to a cryogenic temperature, thereby increasing the cross-sectional area shrinkage (ductility) so that delamination occurs.

In this case, the cryogenic cooling unit and the shear drawing unit, for example, the apparatus disclosed in the application number 2010-0081458 and 2010-0115292 may be used.

In addition, in the following description, the material is a wire rod as an example, and the rolling roll in the shear draw portion described later may be provided with a ball roll.

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 is a view showing a high carbon steel wire manufacturing apparatus according to a preferred embodiment of the present invention.

Referring to the drawings, the present invention includes the cryogenic cooling unit 10 and the shear drawing unit 20, the cryogenic cooling unit 10 and the shear drawing unit 20 is installed in conjunction with, so that the material (1) Immediately after cooling to a cryogenic state in the cryogenic cooling unit 10 while proceeding, it is configured to be shear deformation in the shear fresh portion 20.

The cryogenic cooling unit 10 is a configuration in which the material 1 is cooled in a cryogenic state relatively lower than room temperature, and as an example, a conventional low temperature drawing device (application number 2010-0081458) may be used. There is an outlet through which the refrigerant is injected between the double tubes inside the cylinder and the refrigerant exits on the opposite side of the inlet, thereby cooling the temperature to a cryogenic temperature of -195 ° C.

Of course, the present invention is not limited to this, and any of the cryogenic cooling apparatuses capable of cooling the material at a cryogenic temperature as described above can be utilized.

In addition, the shear wire portion 20 is a configuration for drawing the material 1 while giving a shear deformation to the material (1), as an example, a conventional continuous shear processing apparatus (application number 2010-0115292) can be used, It is a matter of course that the present invention is not limited thereto, and any conventional shearing device may be utilized.

The shear wire 20 as described above is provided in connection with the rear end of the cryogenic cooling unit 10, and immediately after cooling the material 1 to cryogenic temperature, the shear deformation is given to remarkably torsional characteristics of the material 1. Can be strengthened.

The shear wire 20 may include a rolling roll 21 disposed at a rear end of the cryogenic cooling unit 10 and a shear die 22 disposed at a rear end of the rolling roll 21.

In this case, the rolling roll 21 is disposed immediately after the cryogenic cooling unit 10, that is, closest to each other so that the raw material 1 can be rolled in a cryogenic state, and the shear die 22 also has the rolling roll 21. It is arranged as close as possible immediately after the end of) so that it can be sheared in cryogenic conditions.

In this case, the shear dice 22 is used in the shear hole 22a through which the material 1 passes, having the same cross-sectional area along the longitudinal direction.

Due to the shear dice 22 as described above, the material 1 can be processed so that the shear strain is 2.0 or more in the process of shearing while passing through the shear hole (22a).

Since the strain at which the torsion property can be enhanced should be 2.0 or more, the shear extension 20 can be configured as follows so that such an effective strain can occur at the material 1.

FIG. 2 is a view illustrating the inside of the shear die 22 of the shear wire 20 in the high carbon steel wire manufacturing apparatus of FIG. 1.

Referring to the drawings, the shear hole 22a of the shear die 22 has a structure in which the extension structure is bent at least once and extended to impart shear deformation.

That is, the shear hole 22a may be divided into at least two sections which are bent and divided.

Accordingly, the shear deformation is made while the material 1 passes through the bent portion in the shear hole 22a.

Here, the shear hole (22a) is characterized in that the bending angle (Φ) of the bent portion is 120 ° ~ 150 °, to change the shear strain of the material (1) by changing the interval within this numerical range Can be.

Of course, in this case, when the bending angle Φ is greater than 150 °, the bending degree in the advancing direction is too small in the process of drawing the raw material 1 so that the shear force hardly occurs, so that the shear of the raw material 1 Strain generation is not large.

In addition, when the bending angle Φ is smaller than 120 °, the degree of bending in the advancing direction becomes too large when the raw material 1 is drawn, so that the raw material 1 receives an excessive compressive force at the bent portion. Surface defects may occur on the surface of (1).

More specifically, the front end hole 22a of the front end die 22 may include a first line L ₁ , a second line L ₂ , a third line L ₃ , a fourth line L ₄ , and The fifth line L ₅ may be bent and connected sequentially.

That is, the shear hole 22a may be bent and extended four times, and the four bending angles Φ formed at this time are preferably 120 ° to 150 ° as described above.

In addition, the first line (L ₁ ), the third line (L ₃ ), and the fifth line (L ₅ ) is extended to a length of three times or more than five times the diameter (D) of the shear hole (22a), The second line (L ₂ ) and the fourth line (L ₄ ) is characterized in that extending in the length of more than two times three times the diameter (D) of the shear hole (22a).

This numerical range is because the front and rear extension portions of the bent portion should be more than a predetermined length in the course of passing the shear material 22 through the shear hole 22a, so that the shear force can be sufficiently received. In other words, if the length is too short, there is no great difference from simply passing in a straight direction.

In other words, when the lengths of the second line L ₂ , the third line L ₃ , and the fourth line L ₄ are smaller than the above-mentioned numerical values, they do not rise upward by a proper distance in the drawing, and then again horizontally. By not going to the proper distance in the direction and down again by the appropriate distance, the shear deformation does not occur sufficiently as the material 1 does not receive enough shear force.

In addition, even if the length of the first line (L ₁ ), the fifth line (L ₅ ) is smaller than the above-mentioned numerical value, the proper length is not secured before or after bending, so that the shear deformation on the principle as described above This will not occur sufficiently.

And when the length in each line of the front end hole 22a is larger than the numerical value mentioned above, the surface will be roughened by the friction of the raw material 1 with respect to the front end dice 22 for a long time. In addition, as the compressive force of the material 1 also increases in order to advance the shearing dice 22 to be rubbed, the load on the unwinding roller 50 and the unwinding roller 60 is greatly applied.

Furthermore, in an exemplary embodiment of the present invention, the first line L ₁ , the third line L ₃ , and the fifth line L ₅ are parallel, and the second line L ₂ and the fourth line are parallel to each other. (L ₄ ) By the same bending angle φ at each end, as a result, the material 1 can proceed in a straight line along the initial travel direction, while being able to receive sufficient shear deformation.

On the other hand, the present invention may further include a calibration dice (30) disposed at the rear end of the front end die 22 to correct the cross-sectional shape of the material (1) to be passed.

The calibration die 30 is a calibration hole (30a) is formed in the traveling direction so that the material (1) is passed, this calibration hole (30a) is a cross-sectional shape is formed in the final standard shape, while undergoing shear deformation It is possible to draw a cross section of the final standard while correcting the deformed portion of the cross section.

In addition, the present invention may further include a calibration roller unit 40 for guiding the progress of the material 1 in front of the cryogenic cooling unit 10.

The calibration roller portion 40 is disposed in front of the cryogenic cooling unit 10, and serves to guide the calibration so that the raw material 1 is introduced into the cryogenic cooling unit 10.

In this case, the straightening roller unit 40 may include a horizontal roll 41 for vertical calibration, and a vertical roll 42 for horizontal calibration, and the horizontal roll 41 and the vertical roll 42 are appropriate. If the channel is arranged at regular intervals and there is an error in the advancing direction of the material 1, it can be corrected.

Then, a high carbon steel wire manufacturing method using a high carbon steel wire manufacturing apparatus configured as described above will be described in detail.

First, when the raw material 1 is wound on the unwinding roller 50 as a wire rod, the raw material 1 is released from the unwinding roller 50 as the unwinding roller 50 rotates to proceed to the cryogenic cooling unit 10. Done.

In this process, the material 1 is guided by the calibration roller portion 40 so that the raw material 1 can be inserted into the inlet of the cryogenic cooling unit 10 in advance (progress calibration step).

Next, the material 1 introduced into the cryogenic cooling unit 10 may reinforce the torsional characteristics as the cryogenic cooling unit 10 is cooled to the cryogenic state, and is disposed immediately after the cryogenic cooling unit 10. It is possible to maintain the cryogenic state for the shear deformation in the shear draw line 20 (Cryogenic drawing step).

Subsequently, the material 1 passed through the cryogenic cooling unit 10 is rolled through the rolling roll 21 of the shear drawing unit 20 and contracted to a certain extent, and then sheared while proceeding to the shear die 22. It enters into the hole 22a.

At this time, the material 1 is subjected to a shear force while passing through the shear hole 22a in a cryogenic state, and the shear deformation is made.

In addition, the material 1 is compressed to a certain degree through the rolling roll 21, but in the process of passing through the shear hole 22a of the shear dice 22, in particular in the process of passing through the bent portion by the impact of the collision The initial cross-sectional area is recovered by filling the shear hole 22a.

Next, the raw material 1 which has passed through the shear hole 22a of the shear die 22 is to correct the cross-sectional shape of the raw material 1 to the final standard shape through the calibration die 30 (shape correction step). .

The material 1 may be changed in the cross-sectional area during the shear deformation of the shear die 22, and the cross-section of the material 1 to the standard shape in the process of finally passing through the calibration hole 30a of the calibration die 30 Can be corrected.

Finally, after the shear deformation is made to the material 1, the winding roller 60 disposed next can be wound while the material is wound. Of course, it is possible to obtain a compressive force or a tensile force in which the raw material 1 proceeds in the advancing direction by the unwinding roller 50 on the front side or the unwinding roller 60 on the rear end side.

Of course, after the shear deformation is made to the raw material 1, it can be cut at regular intervals by the cutter 70 disposed next.

As described above, the high carbon steel wire manufacturing method of the present invention can reinforce the torsional characteristics of the material 1 as it is fresh while giving shear deformation to the cryogenically drawn material 1 successively.

Next, a more specific embodiment according to the high carbon steel wire manufacturing method of the present invention will be described.

(Example)

The present invention was applied to 0.8% C high carbon steel having an initial wire diameter of 5.5 mmφ and the tensile strength, the reduction of area (RA) and the torsional rotation speed of the material (1) processed by circular drawing were compared.

Here, the cross sectional shrinkage means ductility, and the torsional rotational speed means the number of rotations when delamination (a phenomenon that a steel wire breaks in a spiral shape when twisting occurs) occurs.

As shown in FIG. 3, the processing temperature was cooled to room temperature, -50 ° C., -100 ° C., and -150 ° C., and the passage dies with the bending angle φ of 130 ^° and the calibration dies with a reduction ratio of 30% (30).

The effective strain applied to the material (1) after machining is about 3.4, and the final diameter is 4.6 mm.

4 (a) is a normal temperature, Fig. 4 (b) is the microstructure of observing the processed specimens at -100 ^o C by an electron microscope. It can be seen that the lamella spacing of the material (1) processed at a low temperature is finer than the material (1) processed at room temperature.

As a result of the examples, the physical properties for each temperature are summarized in Table 1.

As shown in Table 1, the material (invention material) drawn by the present invention has no significant change in terms of tensile strength as compared with a material (base material) freshly produced by the conventional method, while the cross- In terms of the number, the figure has increased significantly.

Temperature (℃) Tensile Strength (MPa) Sectional Shrinkage (%) Torsional Rotation (Cycles) The presence (room temperature) 1190 41.0 34.5 Invention material (-50) 1135 41.5 35.2 Inventive material (-100) 1142 45.6 38.2 Invention material (-150) 1167 50.3 42.5

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is to be understood that various changes and modifications may be made without departing from the scope of the appended claims.

10: cryogenic cooling part 20: shear fresh part
21: rolling roll 22: shear dice
22a: Shear hole D: Diameter (of shear hole)
L ₁ : first line L ₂ : second line
L ₃ : third line L ₄ : fourth line
L ₅ : 5th line 30: Calibration dice
30a: calibration hole 40: calibration roller
41: horizontal roll 42: vertical roll
50: unwinding roller 60: coiling roller
70: cutting machine

Claims (10)

delete Cryogenic cooling unit for cooling the material in a cryogenic state; And
A shear draw part that is fresh while imparting shear strain to the material in connection with a rear end of the cryogenic cooling part to impart shear strain immediately after cooling the material to cryogenic temperature to reinforce the torsional characteristics of the material;
Lt; / RTI >
The shear wire portion,
A rolling roll disposed at a rear end of the cryogenic cooling unit; And
It is disposed at the rear end of the rolling roll, shear dice formed with a shear hole; includes;
The shear hole has at least one bent portion, the high carbon steel wire manufacturing apparatus configured to be an effective strain of the shear strain of the material processed sheared while passing through the shear hole is 2.0 or more.
3. The method of claim 2,
The shear hole of the shear dice, high carbon steel wire manufacturing apparatus, characterized in that the bending angle of the bending portion 120 ° ~ 150 °.
3. The method of claim 2,
The shear holes of the shear dice are sequentially connected by bending the first line, the second line, the third line, the fourth line, and the fifth line,
The first line, the third line, and the fifth line extend in a length of three times or more and five times or less of the shear hole diameter, and the second line and the fourth line are two times or more and three times the diameter of the shear hole. High-carbon steel wire manufacturing apparatus characterized by extending to the following length.
3. The method of claim 2,
A calibration die disposed at a rear end of the shear die and having a calibration hole formed to correct a cross-sectional shape of the material to be passed to a final standard shape;
High-carbon steel wire manufacturing apparatus characterized in that it further comprises.
3. The method of claim 2,
A calibration roller unit disposed at a front end of the cryogenic cooling unit and configured to guide-correct the advancing material into the cryogenic cooling unit;
The straightening roller unit is a high-carbon steel wire manufacturing apparatus characterized in that it comprises a horizontal roll for vertical calibration, and a vertical roll for horizontal calibration.
The method according to any one of claims 2 to 6,
The material is a wire rod, the rolling roll is provided with a ball roll,
The shear hole of the shear dice is a high carbon steel wire manufacturing apparatus, characterized in that the same cross-sectional area along the longitudinal direction. delete delete delete

Images