KR101766079B1 - Manufacturing method of brake disc - Google Patents

Manufacturing method of brake disc Download PDF

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Publication number
KR101766079B1
KR101766079B1 KR1020150174491A KR20150174491A KR101766079B1 KR 101766079 B1 KR101766079 B1 KR 101766079B1 KR 1020150174491 A KR1020150174491 A KR 1020150174491A KR 20150174491 A KR20150174491 A KR 20150174491A KR 101766079 B1 KR101766079 B1 KR 101766079B1
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KR
South Korea
Prior art keywords
main
hat
cast iron
casting
mold
Prior art date
Application number
KR1020150174491A
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Korean (ko)
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KR20170067959A (en
Inventor
김윤철
한재민
이윤주
정민균
이병찬
이재영
Original Assignee
현대자동차주식회사
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Priority to KR1020150174491A priority Critical patent/KR101766079B1/en
Publication of KR20170067959A publication Critical patent/KR20170067959A/en
Application granted granted Critical
Publication of KR101766079B1 publication Critical patent/KR101766079B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/0081—Casting in, on, or around objects which form part of the product pretreatment of the insert, e.g. for enhancing the bonding between insert and surrounding cast metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/04—Casting in, on, or around objects which form part of the product for joining parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/02—Braking members; Mounting thereof
    • F16D65/12—Discs; Drums for disc brakes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2250/00—Manufacturing; Assembly
    • F16D2250/0007—Casting

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Braking Arrangements (AREA)

Abstract

A first casting step of casting a cast iron to form a main copper part having a plurality of projections extending in the central direction along the periphery of the central through hole; A second casting step in which the main copper part and the hot part are integrated with each other in such a manner that the main copper part is seated inside the mold and the hat part surrounds the plurality of projections by forming the hat part through injection of the molten cast iron; And a take-out step of solidifying and removing the joined main and sub part and the mold part from the mold.

Description

Technical Field [0001] The present invention relates to a method of manufacturing a brake disk,

The present invention relates to a method of manufacturing a brake disc in which the coupling force with a hat part formed of cast iron is increased despite the thermal expansion occurring in the main part.

A brake disc comprising a main part and a hat part is made up of a cast iron part made of a cast iron part and an aluminum alloy part made of a main part in order to improve the fuel efficiency by weight reduction of a vehicle, This spotlight was received.

However, in such a case, the cast iron and the aluminum alloy have different thermal expansion coefficients, and the coupling strength between the main part and the hat part is weakened due to thermal deformation, which makes it difficult to secure sufficient strength to withstand the maximum braking torque.

Although the method of assembling both the main part and the hat part with cast iron may be a solution to the above problem, it is also possible that the brakes, which are formed by surrounding the protrusions formed around the circumference of the outer diameter of the hat part, There is still a problem that the coupling strength between the main part and the hat part of the disk is weakened due to the difference in the amount of thermal expansion between the main part and the hat part.

It should be understood that the foregoing description of the background art is merely for the purpose of promoting an understanding of the background of the present invention and is not to be construed as an admission that the prior art is known to those skilled in the art.

US 2011/0061980 A1

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of manufacturing a brake disc in which a coupling force with a hat part formed of cast iron is increased despite the thermal expansion occurring in the main part.

According to another aspect of the present invention, there is provided a method of manufacturing a brake disc, including: a first casting step of casting a cast iron to form a main portion having a plurality of protrusions extending in a central direction along a periphery of a central through hole; A second casting step in which the main copper part and the hot part are integrated with each other in such a manner that the main copper part is seated inside the mold and the hat part surrounds the plurality of projections by forming the hat part through injection of the molten cast iron; And a taking-out step of coagulating and removing the joined motif part and the hat part from the mold.

The main part may be formed of gray cast iron and the hat part may be formed of spheroidal graphite cast iron.

And a preheating step of preheating the molded core part after the first casting step.

The motif part and the hat part can be chemically bonded via the protrusion.

In the first casting step, the main part may be provided on both sides of the main part to form a ring portion having a predetermined height along the through hole.

According to the brake disk manufacturing method of the present invention as described above, by using the thermal expansion inevitably generated in the main portion by friction, it is possible to manufacture a brake disk in which the coupling strength of the main part and the hat part made of cast iron is increased .

Further, since no separate treatment is required for the projections formed on the main portion, it is possible to reduce the number of processes, reduce the manufacturing cost, and improve the productivity.

1 shows a conventional brake disc.
2 shows a brake disc according to an embodiment of the invention.
3 is a view of a brake disk having a ring portion according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

A method of manufacturing a brake disk according to the present invention includes: a first casting step of casting a cast iron and providing a main body part (100) having a plurality of projections extending in a central direction along a periphery of a central through hole; The main body part 100 is placed inside the mold and the hat part 200 is formed through the injection of the cast iron melt so that the main part 200 and the hat part 200, (200) to be integrated with each other; And a taking-out step of coagulating and removing the joined main body part (100) and the hat part (200) from the mold.

In a brake disk constituted by a main body part 100 and a hat part 200, the main part 100 is made of cast iron and the hat part 200 is made of an aluminum alloy Technology for manufacturing a brake disc made of different materials has been spotlighted.

However, in this case, the cast iron and the aluminum alloy have different thermal expansion coefficients, and it is difficult to secure enough strength to withstand the maximum braking torque because the coupling strength between the main part 100 and the hat part 200 is weakened due to thermal deformation there is a problem.

Although the method of assembling both the main part 100 and the hat part 200 with cast iron may be a solution to the above problem, as shown in FIG. 1, however, the outer part of the hat part 200 The main body part 100 and the hat part 200 are formed in such a manner that the main body part 100 surrounds the projections formed along the periphery of the main part 100 and the hat part 200, There is still a problem that the bonding force of the part 200 is weakened.

This phenomenon will be described in detail as follows. For example, in the case of a circular plate-shaped component having a through hole at the center and having an inner diameter and an outer diameter, when the thermal expansion of the component occurs due to the heat conduction, the thermal expansion direction is changed in the outer diameter direction, It happens.

Because of this phenomenon, the industry uses technology such as shrinkage fitting that uses it.

On the other hand, the portion of the brake disk where frictional heat is generated due to friction is the main molding part 100, which naturally results in a larger amount of thermal expansion occurring in the main molding part 100 than in the hat part 200.

The joining force between the main part 100 and the hat part 200 due to the gradual thermal deformation due to the thermal expansion in the specific direction described above in the part of the main part 100 surrounding the protrusion of the hat part 200 It will weaken.

Accordingly, in the present invention, in manufacturing the main body part 100 through the first casting step, cast iron is cast so as to form a plurality of projections extending in the central direction along the periphery of the central through hole.

Thereafter, in the second casting step, the hat part 200 is manufactured by using the cast iron melt rather than the molten aluminum alloy, and the hat part 200 surrounds the plurality of projections formed on the main part 100, So that the part 100 and the hat part 200 are combined.

The production of the brake disk is completed by passing through the step of coagulating the main body part 100 and the hatch part 200 combined in this form and taking them out from the mold.

As can be seen from FIG. 2, even if thermal expansion occurs in the main body part 100, the protrusions formed on the main body part 100 thermally expand in the direction of increasing thickness. Therefore, the thermal part 200 ) Is increased more than before thermal expansion occurs.

It is expected that the coupling strength between the main part 100 and the hat part 200 is increased by using the thermal expansion of the main part 100 which is inevitably incurred.

Conventionally, the protrusions have been subjected to discharge machining and ceramic coating treatment through a separate process, but in the case of the brake disc manufacturing method according to the present invention, since no separate treatment is required for the protrusions, the number of process steps can be reduced, Can be expected.

Preferably, the main molding part 100 is formed of gray iron and the hat part 200 is formed of spheroidal graphite cast iron. The cast iron used for manufacturing the main part 100 is gray cast iron, and the gray cast iron is easy to manufacture because of its good castability.

Therefore, the gray iron is suitable for manufacturing the main copper part 100 formed with a plurality of projections according to the present invention.

The cast iron used for manufacturing the hat part 200 uses spheroidal graphite cast iron, and in the case of spheroidal graphite cast iron, it is suitable for manufacturing a hat part 200 having a higher strength than that of gray cast iron.

In the method of manufacturing a brake disk according to the present invention, the preheating step may further include preheating the molded main body part 100 after the first casting step.

The main body 100 is preheated at a temperature of about 300 to 400 DEG C to remove moisture and stress from the main body 100 and to have a high bonding force by joining with the hat part 200. [

Also, it is preferable that the main part 100 and the hat part 200 are chemically bonded via protrusions.

If the conventional brake disc is combined with the main part 100 and the hat part 200 via a plurality of projections merely by using only a structural coupling, the brake disc according to the method of manufacturing a brake disc according to the present invention can be used But also chemical bonding that increases the bonding force between the main part 100 and the hat part 200 due to thermal expansion as well as structural bonding.

Wherein the main part (100) is provided on both sides of the main part (100) in a first casting step such that a ring part (110) having a predetermined height is formed along the through hole.

Even if the hat part 200 is cast while the main part 100 is seated on the mold in the second casting step due to the formation of the ring part 110 as shown in FIG. 3, So that it is possible to protect the friction surface of the main body part 100 in the manufacturing process leading to casting of the hat part 200 of the main body part 100 after casting.

While the present invention has been particularly shown and described with reference to specific embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the following claims It will be apparent to those of ordinary skill in the art.

100: motif part 110: ring part
200: Hat Parts

Claims (5)

A first casting step of casting gray cast iron to form a main copper part having a plurality of projections extending in the central direction along the periphery of the central through hole;
A second casting step in which the main copper part and the hot part are integrated with each other in such a manner that the main copper part is placed inside the mold and the hat part surrounds the plurality of projections by forming the hat part through injection of the molten graphite cast iron; And
And a take-out step of solidifying the joined main part and the hat part to make the main part and the hat part chemically bond through the projections and take out from the mold. delete The method according to claim 1,
After the first casting step,
Further comprising a preheating step of preheating the molded main body part. delete The method according to claim 1,
Wherein the main copper part is provided on both sides of the main copper part in the first casting step so as to form a ring portion having a constant height along the through hole.
KR1020150174491A 2015-12-08 2015-12-08 Manufacturing method of brake disc KR101766079B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150174491A KR101766079B1 (en) 2015-12-08 2015-12-08 Manufacturing method of brake disc

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150174491A KR101766079B1 (en) 2015-12-08 2015-12-08 Manufacturing method of brake disc

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KR20170067959A KR20170067959A (en) 2017-06-19
KR101766079B1 true KR101766079B1 (en) 2017-08-08

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101499125B1 (en) * 2014-07-16 2015-03-06 주식회사 동성정기 Brake disc using different metals and manufacturing methods the same

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101499125B1 (en) * 2014-07-16 2015-03-06 주식회사 동성정기 Brake disc using different metals and manufacturing methods the same

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