KR101585444B1 - HIGH-Mn STEEL BRAKE DISK - Google Patents

Abstract

Provided is a high-manganese steel brake disk comprising: a first disk member including a first disk body, a plurality of first protruding portions disposed radially with an interval from each other on the first disk body, and a first insertion portion formed between the adjacent first protruding portions; a second disk member including a second disk body, a plurality of second protruding portions disposed radially with an interval from each other on the second disk body; a second insertion portion formed between the adjacent second protruding portions; and a fastening member fastened in the direction of the diameter of the first disk member and the second disk member, in a state where the first protruding portion is inserted into the second insertion portion, and the second protruding portion is inserted into the first insertion portion, wherein the first and the second disk member are provided with a manganese steel.

Description

{HIGH-Mn STEEL BRAKE DISK}

The present invention relates to a high manganese steel brake disk, and more particularly, to a high manganese steel brake disk in which a brake disk is composed of a high manganese steel to improve braking performance, wear resistance and heat radiation characteristics.

BACKGROUND ART [0002] Generally, a brake device mounted on an automobile is a device for reducing the vehicle speed of a running vehicle or switching the vehicle to a completely stopped state. The brake device is normally operated to pressurize the brake pedal, Air is transmitted by a brake mechanism provided on the wheel side, and the brake drum or the brake disk is braked through the transmission.

Generally, a brake disk compresses a brake pad to generate a braking effect. In a conventional brake device, a brake disk, which is in contact with a brake pad and generates a braking force, is generally made of carbon steel.

However, the conventional carbon steel constituting the conventional brake disk has heavy disadvantages due to its specific gravity, which is a main cause of deterioration of fuel efficiency when the carbon steel brake disk is applied to automobiles and the like.

In the case of a conventional brake disk made of carbon steel, there is a problem that corrosion may occur due to environmental conditions such as humidity and temperature of the braking surface of the brake disk.

As described above, it is necessary to develop a brake disk utilizing a material other than carbon steel so as to maintain excellent braking performance, heat radiation performance, and corrosion resistance of the brake and reduce the weight of the brake disk.

In the case of a conventional brake disk, the air vent is formed as an integral type and can be produced by the casting method. Since the brake disk is not configured as a split type, a forging method, which is a production method used when securing high rigidity is required There is a problem that it is impossible to produce by the above.

When the fastening member is fastened to the brake disk surface to which the brake pads come into contact, friction of the brake pads due to the fastening holes to which the fastening members are coupled is accelerated and the replacement period of the brake pads is shortened There is a problem that frequent maintenance is required.

Of course, the fastening member can be installed in the form of being inserted into the inside of the brake disk surface where the brake pads are contacted. However, even in this case, there is a problem that the fastening member is exposed due to wear due to use of the brake disk, There is a growing need for a development of a method of joining a split disk member to the side of a brake disk rather than to the side where the brake pads come into contact.

The present invention is realized by recognizing at least any one of the requirements or problems generated in the conventional brake disk.

In one aspect of the present invention, there is provided a high-manganese steel brake disk in which a brake disk is divided into a plurality of pieces, a brake disk can be produced by a forging method, and excellent physical properties such as abrasion resistance and rigidity are easily secured.

According to one aspect of the present invention, there is provided an air conditioner for an air conditioner, which is capable of firmly coupling a divided disk member by a simple method by engaging a divided disk member by inserting a concave- The present invention is to provide a high manganese steel brake disk which can improve the heat radiation performance and productivity.

In one aspect of the present invention, there is provided a high manganese steel brake disk capable of preventing interference between a fastening member and a brake pad by fastening in a radial direction of a split disk member, thereby preventing acceleration of wear of the brake pad.

In one aspect of the present invention, there is provided a high-manganese steel brake disk capable of improving heat dissipation characteristics, wear resistance, and braking performance by utilizing a high manganese steel having excellent thermal conductivity and abrasion resistance and high friction coefficient as a brake disk .

In one aspect of the present invention, there is provided a high-manganese steel brake disk capable of improving the fuel consumption of a vehicle or the like by making a brake disk lightweight by using a high manganese steel having a lower specific gravity than a general carbon steel to manufacture a brake disk.

According to an aspect of the present invention, there is provided a disc drive apparatus including a first disc body, a plurality of first concave-convex portions radially disposed on the first disc body, A first disc member having a first insert; A second disk member having a second disk body, a plurality of second concave-convex portions radially spaced apart from the second disk body, and a second insertion portion formed between the adjacent second concave-convex portions; And a first concavo-convex part inserted into the second insertion part, and in a state in which the second concavo-convex part is inserted into the first insertion part, the first concavo-convex part is fastened in the radial direction of the first disk member and the second disk member Wherein the first disk member and the second disk member are formed of high manganese steel.

Preferably, a height of the first concavo-convex part protruding from the first disc body is formed to be higher than a height of the second concavo-convex part protruded from the second disc body, and the first disc member and the second disc member are formed of the An air vent may be formed which is a space in which the concavo-convex portion and the bottom surface of the second insertion portion are in contact with each other, and the second concavo-convex portion and the first insertion portion are spaced apart from each other.

Preferably, the first disk member has a first fixing portion protruding from the first disk body, and the second disk member has a second fixing portion protruding from the second disk body, The fastening member may be installed through the first fixing part and the second fixing part in the radial direction of the first disk member and the second disk member.

Preferably, the first fixing portion includes a first fixing protrusion protruding from the first disc body and a second fixing insertion portion provided around the first fixing protrusion, and the second fixing portion includes a first fixing protrusion, A second fixing protrusion protruding from the main body; and a second fixing inserting portion provided around the second fixing protrusion, wherein the first fixing protrusion is inserted into the second fixing inserting portion, The fastening member may be installed in the radial direction of the first disk member and the second disk member in a state of being inserted into the first fixed insertion portion.

Preferably, the first fixing portion is disposed opposite to the center axis of the first disc body, and the second fixing portion is disposed opposite to the center axis of the first disc body.

Preferably, the first disc main body and the second disc main body are ring-shaped plate members each having a hollow portion formed therein, and the first concave-convex portion and the second concave-convex portion are radially arranged on the ring-shaped plate- A rod-shaped member having a rectangular cross-section, or a rod-shaped member having a rectangular cross-section and having a constant curvature.

Preferably, the width of the second concave-convex portion is 1.5 to 2.2 times the width of the first concave-convex portion, and the width of the air vent is 1.5 to 2.2 times the width of the first concave-convex portion.

Preferably, the first disk member and the second disk member are made of a high manganese steel comprising, by weight, 0.21 to 0.25% of C, 15 to 19% of Mn, and the balance of Fe and inevitably impurities .

Preferably, the first disk member and the second disk member comprise, as a basic composition, an impurity which is inevitably included with Fe in an amount of 0.21 to 0.25% of C, 15 to 19% of Mn, and the balance of Fe, The composition may include at least one selected from the group consisting of Si: 0.5 to 0.8%, P: 0.013 to 0.015%, and S: 0.002 to 0.0035%, based on the weight of the composition.

Preferably, the first disk member and the second disk member contain 0.21 to 0.25% of C, 15 to 19% of Mn, 0.5 to 0.8% of Si, 0.013 to 0.015% of P, 0.0013 to 0.015 of S, To 0.0035%, and the remainder: Fe and inevitably contained impurities.

According to an embodiment of the present invention as described above, the first disk member and the second disk member are fastened in the radial direction by inserting the concave-convex portion of the split disk member into the insertion portion, There is an effect that frequent replacement of the brake pads can be prevented by preventing the wear of the brake pads from being accelerated due to the interference between the fastening member and the brake pads.

According to the embodiment of the present invention, by joining the split disk member by the method of inserting the concave-convex portion into the insertion portion, the split disk member can be firmly coupled by a simple method, and at the same time, So that the heat radiation performance can be improved.

According to an embodiment of the present invention, the brake disk is divided into a split type including the first disk member and the second disk member, and the brake disk can be produced by the forging method, so that it is easy to secure excellent physical properties such as abrasion resistance and rigidity There is an effect.

According to an embodiment of the present invention, in the state that the first concavo-convex portion and the bottom surface of the second insertion portion are in contact with each other, and the air vent, which is a space that is spaced apart from the second concavo-convex portion and the first insertion portion, By including the fixing structure, it is possible to firmly couple the split disk member by a simple method, and at the same time to form an air vent for improving the heat radiation performance, thereby improving the heat radiation performance and improving the productivity .

According to an embodiment of the present invention, the width of the second concavo-convex portion is larger than the width of the first concavo-convex portion, and the width of the air vent is formed to be larger than the width of the first concavo-convex portion, The heat radiation performance of the brake disk is improved, and furthermore, the weight of the brake disk can be lightened as the air vent is formed largely.

According to an embodiment of the present invention, the first disk member and the second disk member are made of a high manganese steel having excellent thermal conductivity and wear resistance and a high friction coefficient, thereby improving the heat dissipation characteristics, wear resistance and braking performance of the brake disk There is an effect that it can be achieved.

According to one embodiment of the present invention, by adopting a split type structure in which the first disk member and the second disk member are divided and fastened by a fastening member, It is possible to manufacture a brake disc utilizing the forging method and the material characteristics of the high manganese steel so that it is easy to secure excellent physical properties such as weight saving of the brake disc, improvement of abrasion resistance, and improvement of braking performance There is an effect that can be done.

According to an embodiment of the present invention, a brake disk is manufactured by utilizing a high manganese steel having a lower specific gravity than a general carbon steel, thereby reducing the weight of the brake disk and improving the fuel efficiency of a vehicle or the like.

1 is an exploded perspective view of a high manganese steel brake disk according to an embodiment of the present invention.
FIG. 2 is a perspective view showing the coupled state of FIG. 1. FIG.
3A is a cross-sectional view taken along the line AA 'in FIG.
3B is a cross-sectional view taken along line BB 'of FIG.
4 is an exploded perspective view of a high manganese steel brake disk according to another embodiment of the present invention.
FIG. 5 is a perspective view showing the engaged state of FIG. 4;
6A is a cross-sectional view in the CC 'direction of FIG.
And FIG. 6B is a cross-sectional view in the DD 'direction of FIG.
FIG. 7 is a graph showing changes in coefficient of friction and coefficient of friction between high manganese steel and general carbon steel applied to an embodiment of the present invention, and changes in thermal conductivity according to temperature. FIG.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Further, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. The shape and size of elements in the drawings may be exaggerated for clarity.

Hereinafter, a high manganese steel brake disk according to an embodiment of the present invention will be described in detail with reference to the drawings.

1 to 7, a high manganese steel brake disk according to an embodiment of the present invention includes a first disk member 100, a second disk member 200, and a fastening member 300, And may include a coupling portion 400.

1, the high-manganese steel brake disk includes a first disk body 110, a plurality of first concave-convex portions 130 radially spaced apart from the first disk body 110, A first disc member 100 having a first insertion portion 150 formed between the concave and convex portions 130 and a second disc main body 210; A second disc member (200) having a plurality of second concave-convex parts spaced apart from each other and a second insertion part formed between adjacent second concave-convex parts; and a second concave part (300) which is inserted in the radial direction of the first disk member (100) and the second disk member (200) while the second concavo-convex part is inserted into the first insertion part (150) ).

The first disc member 100 and the second disc member 200 may be formed of high-manganese steel.

At this time, when the first concave-convex portion 130 is inserted into the second insertion portion and the second concave-convex portion is inserted into the first insertion portion 150, the first disk member 100 and the second disk The member 200 can be fixed.

The first disk member 100 may include a first disk body 110, a plurality of first concave-convex portions 130, and a first insertion portion 150.

1, the first insert 150 includes a first disc body 110 and a side surface of the first concave-convex part 130 disposed adjacent to both sides of the first disc body 110 It is enclosed space.

2 and 3B, when the first disc member 100 and the second disc member 200 are engaged, the second concave-convex portion may be inserted into the first insertion portion 150, The height of the portion 150 may be higher than the height of the second concave-convex portion.

At this time, a part of the first inserting part 150 in which the second concave-convex part is inserted in the state where the first disk member 100 and the second disk member 200 are engaged is provided with an air vent V communicating in the horizontal direction, Can be formed.

The second disc member 200 may include a second disc body 210, a plurality of second concave-convex portions, and a second insert portion.

1, the second insertion portion is a space surrounded by the second disk body 210 and the side surfaces of the second concave-convex portion disposed adjacent to both side surfaces of the second disk body 210. As shown in Fig.

3A and 3B, the first irregular portion 130 may be inserted into the second insertion portion, and the height of the second insertion portion may be formed to be lower than the height of the first irregular portion 130 The first disk member 100 and the second disk member 200 may be coupled with each other while the first concavo-convex part 130 is in contact with the bottom surface of the second insertion part.

1, the first concave-convex portion 130 is radially disposed with respect to the center of the first disc body 110, and the second concave-convex portion is radially disposed with respect to the center of the second disc body 210. [ As shown in FIG.

As shown in FIGS. 1 and 2, the fastening member 300 has a first concave-convex part 130 inserted into the second insertion part, and the second concave-convex part is inserted into the first insertion part 150 The first disk member 100 and the second disk member 200 can be fastened in the radial direction.

By fastening the first disk member 100 and the second disk member 200 in the radial direction, it is possible to prevent the wear of the brake pads from being accelerated by the interference of the brake pads 300 and the brake pads, There is an effect that can be prevented.

The first disk member 100 is provided with a first fixing portion protruding from the first disk body 110 for fastening the first disk member 100 and the second disk member 200, The member 200 may be provided with a second fixing part protruding from the second disk body 210. At this time, the fastening member 300 may be installed through the first fixing part and the second fixing part.

The fastening member 300 may be installed through the side surfaces of the first fixing portion and the second fixing portion in a state where the first fixing portion and the second fixing portion are coupled.

1, the first disc member 100 may include a first disc body 110, a first concave-convex part 130, a first insertion part 150, and a first fixing part

The first disk member 100 includes a first disk body 110, a plurality of first concave-convex parts 130 radially spaced apart from the first disk body 110, And a first fixing part protruding from the first disc main body 110. The first fixing part may include a first fixing part and a second fixing part.

1, the second disc member 200 may include a second disc body 210, a second concave-convex part 230, a first insert part 250, and a first fixing part

The second disk member 200 includes a second disk body 210, a plurality of second concave-convex portions radially spaced apart from the second disk body 210, and a plurality of second convex- 2 insertion portion and a second fixing portion protruding from the second disk body 210. [

4 and 5, the first fixing part may include a first fixing protrusion 170 and a first fixing insert 190, and the first fixing part may include a first fixing part A first fixing protrusion 170 protruding from the first fixing protrusion 170 and a second fixing inserting unit 290 provided around the first fixing protrusion 170.

The first fixing protrusion 170 and the second fixing protrusion 270 may be formed as a rectangular protrusion block formed in the circumferential direction of the first disc body 110 and the second disc body 210, And a curved protruding block having a curvature corresponding to the curvature of the second disc main body 210.

As shown in FIGS. 2 and 5, the first fixing protrusions 170 and the second fixing protrusions 270 may be combined to form a rectangular block shape arranged in the axial direction of the disc member.

4 and 5, the second fixing part may include a second fixing protrusion and a second fixing insert 290, and the second fixing part may include a protrusion (not shown) protruding from the second disc body 210 And a second fixed insertion part 290 provided around the second fixed projection part.

Referring to FIGS. 1, 2, 4, and 5, a first fixing protrusion 170 is inserted into the second fixing insert 290, and the second fixing protrusion is inserted into the first fixing insert The fastening member 300 can be installed in the radial direction of the first disk member 100 and the second disk member 200 while being inserted into the first disk member 100 and the second disk member 200.

The fastening member 300 may be installed in a state where the first fixing protrusion 170 is in contact with the second disc main body 210 and the second fixing protrusion is in contact with the first disc main body 110.

The fastening member 300 may be installed through the first fastening hole 171 formed in the first fastening protrusion 170 and the second fastening hole 271 formed in the second fastening protrusion, May be a bolt member and may be fastened to internal threads formed in the first fastening hole 171 and the second fastening hole 271.

4, the first fixing portion is disposed opposite to the center axis of the first disc body 110, and the second fixing portion is disposed to face the center axis of the first disc body 110 As shown in FIG.

The first disk member 100 and the second disk member 200 can be stably positioned at the same time that the first disk member 100 and the second fixing member are opposed to each other, As shown in Fig.

A plurality of coupling holes 410 for coupling with the disc main body may be radially formed in the shaft coupling portion 400. [ .

A plurality of coupling holes 115 formed at positions corresponding to the coupling holes 410 formed in the shaft coupling portion 400 may be formed in the disk body and the plurality of coupling holes 115 may be formed in the shaft coupling portion 400 and the first disk body 110 A fixing member such as a bolt (not shown) may be fastened to the formed coupling holes 410 and 115 so that the disc main body and the shaft coupling portion 400 may be fixed.

The height of the first concavo-convex part 130 protruding from the first disc body 110 may be higher than the height of the second concavo-convex part of the second disc body 210, as shown in FIGS. 2, 3A, 5, Wherein the first disc member 100 and the second disc member 200 are formed such that the bottom surface of the first concavo-convex part 130 and the bottom surface of the second insertion part are in contact with each other, An air vent V that is a space that is spaced apart from the concave / convex portion and the first insertion portion 150 in a state where they are opposed to each other can be formed.

As shown in FIGS. 2 and 5, the first concavo-convex part 130 and the bottom surface of the second insertion part are in contact with each other, the second concavo-convex part and the first insertion part 150 are opposed to each other, The bottom surface of the first fixing protrusion 170 and the bottom surface of the second fixing insert 290 are in contact with each other and the bottom surface of the first fixing protrusion 190 is in contact with the bottom surface of the second fixing protrusion. In this state, the fastening member 300 may be installed to penetrate the first fixing protrusion 170 and the second fixing protrusion, and the fastening member 300 may be disposed between the first disc member 100 and the second disc member 200, As shown in FIG.

3B and 5B, the first disk member 100 and the second disk member 200 are fastened in the radial direction by inserting the concave-convex portion of the split disk member into the insertion portion, It is possible to prevent the wear of the brake pads from being accelerated due to the interference between the coupling member 300 and the brake pads, thereby preventing frequent replacement of the brake pads.

In a state where the first concavo-convex part 130 and the bottom surface of the second insertion part are in contact with each other, and the air vent V, which is a space in which the second concavo-convex part and the first insertion part 150 are spaced apart from each other, By including the mutually fixed structure, the divided disk member can be firmly coupled by the simple method, and at the same time, the air vent V for improving the heat radiation performance can be formed, thereby improving the heat radiation performance and improving the productivity .

The height of the first concave-convex part 130 protruding from the first disc body 110 may be 2 to 2.8 times the height of the second concave-convex part protruded from the second disc body 210. Accordingly, the height of the air vent V can be formed to be 1 to 1.8 times the height of the second concave-convex member, so that the deterioration of the coupling force of the high-manganese steel brake disk can be prevented and the heat radiation performance can be optimized.

These results indicate that the height of the first concave-convex part 130 protruding from the first disc body 110 and the height of the second concave-convex part protruding from the second disc body 210 are set to various values, An optimum value that can exert an excellent heat radiation performance within a range in which the deterioration of the cohesion force of the high-manganese steel brake disk does not largely occur is derived.

When the height of the first concave-convex part 130 protruded from the first disc body 110 is not more than twice the height of the second concave-convex part protruding from the second disc body 210, the height of the air vent V The heat dissipation performance of the high manganese steel brake disk may be significantly reduced.

When the height of the first concavo-convex part 130 protruding from the first disc body 110 is 2.8 times or more the height of the second concavo-convex part protruding from the second disc body 210, There may be a problem in bonding force.

1 and 5, the first disc main body 110 and the second disc main body 210 are formed in a ring-shaped plate-like member having hollow portions 113 and 213 formed therein, The concave-convex portion 130 and the second concave-convex portion can be radially arranged on the ring-shaped plate-shaped member.

Here, as shown in FIG. 1, the first irregular portion 130 and the second irregular portion may be formed as a rod-like member having a rectangular cross section. In this case, the air vent V formed by coupling the first disk member 100 and the second disk member 200 may have a straight air passage having a rectangular cross section.

As shown in FIG. 5, the first concave-convex part 130 and the second concave-convex part may be provided as a bar-shaped member having a rectangular cross section and having a constant curvature. In this case, the air vent V formed by the first disk member 100 and the second disk member 200 is formed into a curved air passage having a rectangular cross section and bent at a predetermined curvature .

The width of the second concave-convex part is larger than the width of the first concave-convex part 130, and the width of the air vent V may be larger than the width of the first concave-convex part 130.

The widths of the first irregular portion 130 and the second irregular portion may be the same. Preferably, the width of the second concave-convex portion is larger than the width of the first concave-convex portion 130, and the width of the air vent V is larger than the width of the first concave-convex portion 130 .

Since the air vent (V) is largely formed, the heat dissipation performance of the high manganese steel brake disk is improved, and furthermore, the weight of the high manganese steel brake disk is lightened so that the air vent (V) is largely formed.

As described above, since the high manganese steel brake disc is lightweight, the amount of high manganese steel used for manufacturing the brake disc is reduced by the space of the widely formed air vent (V), and the production cost can be reduced. There is an effect that can be done.

Also, there is an effect that the flow of air through the widely formed air vent V is improved, and the heat radiation characteristic of the brake disk is improved.

The width of the second concave-convex portion is 1.5 to 2.2 times the width of the first concave-convex portion 130. The width of the air vent V may be 1.5 to 2.2 times as wide as the width of the first concave- In this case, the lowering of the engagement force of the brake disk is prevented, and the heat radiation performance can be optimized.

As a result of repeating the test by setting the width of the second concavo-convex portion and the width of the first concavo-convex portion 130 at various values, excellent heat radiation performance can be exhibited within a range where the deterioration of the cohesion force of the high- The optimal value is obtained.

If the width of the second concave-convex portion is 2.2 times or more the width of the first concave-convex portion 130, there may be a problem in the engagement force of the brake disk.

The first disc member 100 and the second disc member 200 may be formed of high-manganese steel.

When the first disk member 100 and the second disk member 200 are made of high manganese steel, the heat radiation characteristics, wear resistance, and braking performance of the brake disk can be improved.

Specifically, the first disk body 110 and the second disk body 210, which are in contact with the brake pads, are made of high-manganese steel having a high coefficient of friction (unit: constant coefficient μ), so that wear resistance and braking performance are improved And the first concave-convex part 130 forming the air vent V and the second concave-convex part are constituted by high-manganese steel, and the heat radiation characteristic can be improved.

The first disk member 100 and the second disk member 200 are not entirely made of a high manganese steel but the first disk member 100 and the second disk member 200 are not made of a high manganese steel, The first disc body 110 and the second disc body 210, which are in contact with at least the brake pads, may be formed of high-manganese steel.

When the brake disk is made of high manganese steel, there is a problem that the high manganese steel is inferior in casting composition. Therefore, it is difficult to manufacture a brake disk made of high manganese steel by applying the casting method used for manufacturing brake disk using conventional carbon steel material have.

Therefore, by adopting a method in which the high manganese steel brake disk is divided into a split type in which the first disk member 100 and the second disk member 200 are separated and fastened by the fastening member 300, And it is possible to produce brake discs using the material characteristics of high manganese steel. Therefore, weight saving of brake discs, improvement of abrasion resistance, improvement of braking performance, etc. It is possible to facilitate the securing of the excellent physical properties of the substrate.

The first disk member 100 and the second disk member 200 of the present invention are composed of 0.21 to 0.25% of C, 15 to 19% of Mn, and the balance of Fe and inevitably impurities And the like.

7 (a) is a graph showing the relationship between the content of Fe and inevitably impurities contained in the high manganese steel and the general carbon steel (Fe), which is applied to an embodiment of the present invention, in which 0.21 to 0.25% of C, 15 to 19% of Mn, And a change in friction coefficient depending on the distance.

FIG. 7 (b) is a graph showing the results obtained by using the high manganese steel and the general carbon steel which are composed of 0.21 to 0.25% of C, 15 to 19% of Mn, and the balance of Fe and inevitably included impurities, FIG. 3 is a graph showing a change in thermal conductivity according to temperature of a semiconductor device.

The first disc member 100 and the second disc member 200 are made of high-manganese steel composed of 0.21 to 0.25% of C, 15 to 19% of Mn, and the remainder of Fe and inevitably impurities, The first disc member 100 and the second disc member 200 were formed in a weight percentage of 0.21 to 0.25% of C, 15 to 19% of Mn, respectively, as a result of comparing braking performance, abrasion resistance, %, And the remainder: Fe and inevitably included impurities, the braking performance is 7.2% or more as compared with the case where the first disc member 100 and the second disc member 200 are made of ordinary carbon steel , And the heat radiation performance was improved by 5.4% or more.

Specifically, the high manganese steel of the present invention, which is composed of 0.21 to 0.25% of C, 15 to 19% of Mn, and the balance of Fe and inevitably included by weight in accordance with the ASTM G65 test method (abrasion test) A quantitative experiment was conducted to evaluate the abrasion resistance of API X70 steel for abrasion wear, which is a kind of ordinary carbon steel.

As a result, when the result of ASTM G65 test (abrasion test) was compared with that of API X70 steel for abrasion resistance, the result of X70 was 1, the result of 0.2 ~ 0.25 was obtained for high manganese steel of the present invention, That is, it can be seen that the abrasion resistance performance of the high manganese steel of the present invention is improved by about 4 to 5 times as compared with the API X70 steel of the comparative material.

The first disk member 100 and the second disk member 200 may contain impurities inevitably contained in the base composition in an amount of 0.21 to 0.25% of C, 15 to 19% of Mn, , And at least one selected from the group consisting of 0.5 to 0.8% of Si, 0.013 to 0.015% of P, and 0.002 to 0.0035% of S by weight in the base composition.

The first disk member 100 and the second disk member 200 may contain 0.21 to 0.25% of C, 15 to 19% of Mn, 0.5 to 0.8% of Si, 0.013 to 0.015 of P, %, S: 0.002 to 0.0035%, and the remainder: Fe and inevitably included impurities.

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, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. And will be apparent to those skilled in the art.

100: first disc member 110: first disc body
113: hollow portion 115: engaging hole
130: first uneven portion 150: first insertion portion
170: first fixing projection 171: first fixing hole
190: first fixed insertion portion 200: second disk member
210: second disk body 213: hollow
230: second concave / convex portion 250: second insertion portion
270: second fixing projection 271: second fixing hole
290: second fixed insertion portion 300: fastening member
400: shaft coupling portion 410: coupling hole
V: Air vent

Claims (10)

A first disc member having a first disc main body, a plurality of first concave-convex portions radially spaced from the first disc main body, and a first insert portion formed between adjacent first concave-convex portions;
A second disk member having a second disk body, a plurality of second concave-convex portions radially spaced apart from the second disk body, and a second insertion portion formed between the adjacent second concave-convex portions; And
A fastening member which is inserted in the second insertion portion of the first concavo-convex portion and fastened in the radial direction of the first disk member and the second disk member in a state where the second concavo-convex portion is inserted into the first insertion portion; Lt; / RTI >
Wherein the first disc member and the second disc member are formed of high manganese steel.
The method according to claim 1,
Wherein a height of the first concavo-convex part protruding from the first disc body is higher than a height of the second concavo-convex part protruding from the second disc body,
Wherein the first disk member and the second disk member comprise a first disk member,
Wherein an air vent is formed which is a space in which the first concavo-convex part and the bottom surface of the second insertion part are in contact with each other, and the second concavo-convex part and the first insertion part are spaced apart from each other.
The method according to claim 1,
Wherein the first disk member has a first fixing part protruding from the first disk body,
Wherein the second disk member has a second fixing part protruding from the second disk body,
Wherein the fastening member is installed to penetrate the first fixing portion and the second fixing portion in the radial direction of the first disk member and the second disk member.
The method of claim 3,
The first fixing portion may include a first fixing protrusion protruded from the first disc body and a second fixing insert disposed around the first fixing protrusion,
The second fixing portion may include a second fixing protrusion protruding from the second disc main body and a second fixing insertion portion provided around the second fixing protrusion,
Wherein the first fixing protrusion is inserted into the second fixing insertion portion and the second fixing protrusion is inserted into the first fixing insertion portion and the coupling member is inserted into the first disc member and the second disc member, Directional brake discs.
The method of claim 3,
Wherein the first fixing portion is disposed opposite to the center axis of the first disk body,
Wherein the second fixing portion is disposed opposite to the center axis of the first disc body.
The method according to claim 1,
Wherein the first disc body and the second disc body are formed in a ring-shaped plate-like member having a hollow portion therein,
The first concavo-convex portion, and the second concavo-
Wherein the high-manganese steel brake disc is provided with a rod-like member having a rectangular cross-section or a rod-like member having a rectangular cross-section and having a constant curvature, arranged radially in the ring-shaped plate-like member.
3. The method of claim 2,
The width of the second concavo-convex portion is 1.5 to 2.2 times the width of the first concavo-convex portion,
Wherein the width of the air vent is 1.5 to 2.2 times the width of the first concavo-convex portion.
2. The disk drive according to claim 1, wherein the first disk member and the second disk member comprise:
Wherein the high-manganese steel brake disk is made of high-manganese steel which is composed of 0.21 to 0.25% of C, 15 to 19% of Mn, and the balance of Fe and inevitably impurities.
2. The disk drive according to claim 1, wherein the first disk member and the second disk member comprise:
0.2 to 0.25% of C, 15 to 19% of Mn, and the balance of Fe and inevitably impurities,
Wherein the base composition comprises at least one selected from the group consisting of 0.5 to 0.8% of Si, 0.013 to 0.015% of P, and 0.002 to 0.0035% of S as weight% High manganese steel brake discs.
The optical disk apparatus according to claim 2, wherein the first disk member and the second disk member comprise:
The steel sheet according to any one of claims 1 to 3, wherein the steel sheet contains 0.21 to 0.25% of C, 15 to 19% of Mn, 0.5 to 0.8% of Si, 0.013 to 0.015% of P, 0.002 to 0.0035% of S, Wherein the high-manganese steel brake disk is made of high-manganese steel.

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