KR101626830B1 - Base tray system - Google Patents
Base tray system Download PDFInfo
- Publication number
- KR101626830B1 KR101626830B1 KR1020150150313A KR20150150313A KR101626830B1 KR 101626830 B1 KR101626830 B1 KR 101626830B1 KR 1020150150313 A KR1020150150313 A KR 1020150150313A KR 20150150313 A KR20150150313 A KR 20150150313A KR 101626830 B1 KR101626830 B1 KR 101626830B1
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- KR
- South Korea
- Prior art keywords
- heat treatment
- support tray
- carburizing
- tray
- support
- Prior art date
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Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/20—Carburising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/20—Carburising
- C23C8/22—Carburising of ferrous surfaces
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
Description
More particularly, the support portion of the support tray is formed in a hemispherical shape which is the same as or similar to the bottom surface of the heat treatment furnace to maintain easy seating and fixing, And the first and second wrinkles for increasing the surface area of the second gap holding member are provided so as to enhance the competitiveness of the product by providing an easily supporting force against the vertically acting load, .
Generally, since cams and rolls, which are components mounted inside the engines of large ships, can not be replaced once they are installed inside the engine of the ship, they are used semi-permanently until the life of the ship is over. Therefore, components such as large-sized marine cams and rolls should have particularly good physical properties such as hardness and abrasion resistance. However, unlike a small cam mounted inside an engine for an automobile, it is difficult to handle and difficult to heat There are following problems.
The method for heat treatment of the large-sized marine cam and its parts generally uses a carburizing heat treatment method, which is a quenching method in which a raw material is forged and then subjected to a heat-up step, an isothermal step, a heating step, And a method of passing through the steps.
On the other hand, the carburization method does not change the chemical composition of the steel or the amount of alloying elements contained in the steel during the steelmaking process. However, when manufacturing machines, it is sometimes necessary to change the chemical composition of the steel according to the purpose of use. One of the ways of changing these components is surface hardening, which makes the surface hard. The surface hardening is characterized in that the change in chemical composition occurs only in a solid steel and occurs only in the surface layer of the material. In many cases, a surface hardness of a mechanical part requires a material having high abrasion resistance and impact resistance, . These components include gears, cams, and camshafts.
Many of the surface hardening methods include carburizing, nitriding, high frequency quenching and flame quenching, discharge hardening, and metal penetration. The carburizing method is a method of infiltrating carbon on the surface of steel.
The carburizing method is classified into a solid, liquid, and gas carburization method. In the solid carburization method, an alloy layer is formed on the surface by diffusion or penetration of a metal or a non-metal at a high temperature onto the surface of a cast steel. The carburizing agent is mainly composed of 60-70% of charcoal, 20-30% of barium carbonate, and 10% or less of sodium carbonate. The carburizing temperature is controlled by the steel at a temperature of around 900 ℃ for a long time, so that the core structure becomes large, quenching hardens the center structure and hardens the surface layer.
Some carburizing parts do not carburize, but carburize only one part. Such a case is referred to as local carburization, and an anti-carburizing agent is applied to prevent carburization. Currently, copper plating is the most used for the carburizing prevention. It is sufficient that the thickness of the copper plating is about 20 mu m.
In the liquid carburization method, a material to be carburized is immersed in a solution made of a carburizing agent containing NaCl and NaCl as a main component and carburized
The gas carburization method is widely used because it has a higher thermal efficiency and a simpler process than the solid carburization method. Carbon monoxide and hydrocarbon gas such as methane, ethane, propane, and natural gas are mainly used as the gas carburizing agent. Gas carburizing has a shorter carburizing time than solid carburizing. In addition, the carburizing time can be remarkably shortened by using the high-frequency heating at the temperature. When the temperature is maintained at 950 to 1050 ° C by high-frequency heating and the carburizing depth is set at 0.8 to 1.0 mm, this temperature is maintained for about 30 to 40 minutes, so that carburization is sufficiently performed. Also, after carburizing, any kind of gas must be used for secondary heat treatment. The reason for this is that when the carburizing part is made of steel, the deep-part structure is assembled by heating for a long time at a high temperature. In addition, reheat treatment is necessary to prevent the steel from being broken due to the change of the steel structure and to increase the hardness of the surface layer. The re-heat treatment is performed at a temperature of about 850 ° C to 900 ° C, and then the material is cooled again and quenched. Secondly quench at 760 ~ 780 ℃. Finally, it is tempered at 150 ~ 170 ℃.
1, a conventional carburizing heat treatment method includes a
The support tray system includes a
2, the
The receiving
Each of the insertion tray 222, the
However, as shown in FIG. 3, not only the components of the support tray 20 but also the welded portions formed to connect the components are carburized together with the base material, The welded parts of the component parts of the
SUMMARY OF THE INVENTION It is an object of the present invention to solve the problems described above and it is an object of the present invention to provide a support tray of a support tray, There is provided a base tray system for a carburizing heat treatment base material in which first and second wrinkles for increasing the surface area are formed on the two spacing members to provide an easily supporting force against a vertically acting load to enhance product competitiveness There is.
According to an aspect of the present invention, there is provided a support tray system for stably holding a base material in a carburizing heat treatment furnace to perform a carburizing process, the system comprising: a stationary shaft; A support tray inserted into the fixing shaft and fixed to the lower portion of the fixing shaft, the lower portion of the support tray being seated on a bottom surface of the heat treatment furnace; At least one support tray inserted in the fixing shaft and configured to receive the base material; And first and second spacing members configured to maintain a gap between the support tray and the support tray and between the support trays.
In the present invention, the support tray may include: a boss having a third insertion hole formed at a center thereof to receive a fixing shaft; A spindle having a constant length formed at an outer periphery of the boss at equal intervals and radially; And a connection boss which forms a concentric circle at a predetermined interval with the boss and has a fourth insertion hole formed at a position overlapping the spokes; And a connection boss formed on an outer periphery of the spokes and having a fourth insertion hole formed at an overlapping portion thereof,
In the present invention, the first gap retaining member may be formed with a fourth insertion hole into which a fixing shaft is inserted at the center; And a first wrinkle to improve the supporting force against the vertical load at the outer periphery.
In the present invention, the second gap retaining member may include: a body; And an insertion protrusion protruding a predetermined length from each of both ends of the body; The outer periphery of the body includes a second wrinkle so that the supporting force is improved with respect to a vertical load; The second gap holding member is preferably formed in a hollow tube shape so that the weight is minimized.
In the present invention, the support tray and the support tray are preferably formed of stainless steel.
According to the present invention, since the support portion of the support tray is formed in a hemispherical shape which is the same as or similar to the bottom surface of the heat treatment furnace, the first and second spacing members for maintaining the easy seating and fixing state, By forming the second wrinkles, it is possible to provide an easy supporting force for a vertically acting load, thereby enhancing the competitiveness of the product.
The second gap holding member is formed in a hollow tube shape by the second wrinkles to minimize the weight of the second gap holding member to minimize the total weight of the receiving tray system, thereby minimizing an overload acting on the lifting unit.
1 is a schematic cross-sectional view showing a conventional carburizing heat treatment state.
FIG. 2 is a view showing a separation between a jig base and a fixing jig used in a conventional carburizing heat treatment.
3 is a photograph showing a broken state of a fixing jig used in a conventional carburizing heat treatment.
4 is a schematic exploded perspective view of a backing tray system in accordance with the present invention;
5 is a cross-sectional view of the backing tray system according to the present invention;
6 is a side view and plan view of a backing tray according to the present invention;
7 is a schematic cross-sectional view of a second gap retaining member according to the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like elements throughout the drawings and will not be described in detail.
4 to 7, the
The
A fixed
The
The
A
In addition, the outer periphery of the
A plurality of second insertion holes 328 are formed in the outer peripheral side of the
In addition, the
The
The
The
The
A
The
The number of the
In addition, a
The
A
The
The
The
The
The first
The first
In addition, the first
The
The second
The
The
The insertion protrusions 354 are formed at both ends of the
A
The
In addition, the second
The operation state of the support tray system of the base material for carburizing heat treatment as described above will be described below.
First, the
The
An
In this case, the base material may be placed on the
Subsequently, the
The upper end of the
The insertion protrusions 354 formed above the plurality of
Accordingly, the gap between the
The first and second
As described above, the first and
In the support tray system configured as described above, the
In addition, by forming the first and
The second
The above description is only one embodiment for carrying out the base tray system of the carburizing heat treatment base material, and the present invention is not limited to the above embodiment. It will be understood by those skilled in the art that various changes may be made without departing from the spirit of the invention.
300: support tray system 310: fixed shaft
312: fixed end 320: support tray
322: first insertion hole 324: first insertion groove
326: Support portion 328: Second insertion hole
330: support tray 331: second insertion groove
332: third insertion hole 333: boss
334: Spoke 335: Connecting boss
336: Intermediate connection 337: Fourth insertion ball
338: Outer connection 340: First spacing member
342: fifth insert hole 344: first wrinkle
350: second gap retaining member 352: body
354: insertion projection 356: second wrinkle
Claims (5)
A fixed shaft 310;
A support tray 320 inserted into the fixing shaft 310 and fixed to the lower portion of the fixing shaft 310 and having a lower portion placed on a bottom surface of the heat treatment furnace 1;
At least one support tray (330) inserted into the fixed shaft (310) and configured to receive the base material;
And first and second spacing members (340) (350) formed between the support trays (320) and the support trays (330) and between the support trays (330)
The support tray 330 includes a boss 333 formed with a third insertion hole 332 through which the fixing shaft 310 is inserted in the center;
A spoke 334 formed at a constant length in the radial direction with equal intervals at the outer periphery of the boss 333;
An intermediate connecting piece 336 including a connecting boss 335 concentrically formed at a predetermined distance from the boss 333 and having a fourth insertion hole 337 formed at a position overlapping the spokes 334; And
An outer connecting piece 338 formed at the outer periphery of the spokes 334 and having a connecting boss 335 in which a fourth insertion hole 337 is formed at the overlapping portion;
Wherein the carburizing tray system of the base material for carburizing heat treatment is characterized by comprising:
A fifth insertion hole 342 through which the fixing shaft 310 is inserted is formed at the center;
A first wrinkle 344 for enhancing the supporting force against the vertical load on the outer periphery;
Wherein the carburizing tray system of the base material for carburizing heat treatment is characterized by comprising:
A body 352; And
And an insertion protrusion (354) protruding by a predetermined length at both ends of the body (352);
And a second wrinkle (356) on the outer periphery of the body (352) so that a supporting force against the vertical load is improved;
The second gap holding member 350 may have a hollow tube shape to minimize weight.
Wherein the base material of the base material for the carburization heat treatment is formed of a metal material.
The support tray 320 and the support tray 330 are made of stainless steel;
Wherein the base material is formed of a metal material.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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KR1020150150313A KR101626830B1 (en) | 2015-10-28 | 2015-10-28 | Base tray system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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KR1020150150313A KR101626830B1 (en) | 2015-10-28 | 2015-10-28 | Base tray system |
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KR101626830B1 true KR101626830B1 (en) | 2016-06-02 |
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KR1020150150313A KR101626830B1 (en) | 2015-10-28 | 2015-10-28 | Base tray system |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112281108A (en) * | 2020-10-29 | 2021-01-29 | 南京国重新金属材料研究院有限公司 | High-temperature nitriding treatment device |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100503838B1 (en) | 1996-12-09 | 2005-10-21 | 신토고교 가부시키가이샤 | Gas Carburizing Furnace Parts and Jigs |
KR100654695B1 (en) | 2006-05-04 | 2006-12-06 | 주식회사 성도 | Method for heat treatment of cam and the parts for a large ship |
KR20090126391A (en) | 2008-06-04 | 2009-12-09 | 에스티엑스중공업 주식회사 | Manufacturing method of cam for low-speed marine engines |
KR20100105128A (en) | 2009-03-20 | 2010-09-29 | 배진범 | Muliti-purpose plasma heat-treatment apparatus |
-
2015
- 2015-10-28 KR KR1020150150313A patent/KR101626830B1/en active IP Right Grant
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100503838B1 (en) | 1996-12-09 | 2005-10-21 | 신토고교 가부시키가이샤 | Gas Carburizing Furnace Parts and Jigs |
KR100654695B1 (en) | 2006-05-04 | 2006-12-06 | 주식회사 성도 | Method for heat treatment of cam and the parts for a large ship |
KR20090126391A (en) | 2008-06-04 | 2009-12-09 | 에스티엑스중공업 주식회사 | Manufacturing method of cam for low-speed marine engines |
KR20100105128A (en) | 2009-03-20 | 2010-09-29 | 배진범 | Muliti-purpose plasma heat-treatment apparatus |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112281108A (en) * | 2020-10-29 | 2021-01-29 | 南京国重新金属材料研究院有限公司 | High-temperature nitriding treatment device |
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