KR100471215B1 - Treatment method for welding portion of the bumper cover mold - Google Patents

Treatment method for welding portion of the bumper cover mold Download PDF

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KR100471215B1
KR100471215B1 KR10-2001-0081238A KR20010081238A KR100471215B1 KR 100471215 B1 KR100471215 B1 KR 100471215B1 KR 20010081238 A KR20010081238 A KR 20010081238A KR 100471215 B1 KR100471215 B1 KR 100471215B1
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welding
temperature
heating
welded
bumper cover
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KR10-2001-0081238A
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KR20030050727A (en
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정규동
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현대자동차주식회사
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    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
    • 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
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • 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
    • C21D1/26—Methods of annealing
    • C21D1/30—Stress-relieving

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Child & Adolescent Psychology (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

본 발명은 범퍼 커버 금형의 용접부 처리방법에 관한 것으로서, 용접 대상물을 마르텐 사이트 변형 온도보다 높은 가열 온도로 예열하는 예열단계와, 상기 가열온도로서 상기 용접 대상물의 용접층간의 온도를 동일하게 유지하며 용접을 실시하는 용접단계와, 상기 단계에서 용접된 용접부위를 조질 처리에서 사용되는 템퍼링(Tempering) 온도로 일정시간 가열하는 후열단계와, 상기 용접된 용접부를 가공하는 가공단계와, 상기 템퍼링 온도를 이용하여 용접부의 응력을 제거하는 응력 제거단계를 포함한다.The present invention relates to a method of processing a welded portion of a bumper cover mold, the preheating step of preheating the welding object to a heating temperature higher than the martensitic deformation temperature, and maintaining the same temperature between the welding layers of the welding object as the heating temperature. Performing a welding step, a post-heating step of heating the welded welded at the step to a tempering temperature used in the tempering treatment for a predetermined time, a processing step of processing the welded weld, and using the tempering temperature And a stress removing step of removing the stress of the welding portion.

Description

범퍼 커버 금형의 용접부 처리방법{TREATMENT METHOD FOR WELDING PORTION OF THE BUMPER COVER MOLD}TREATMENT METHOD FOR WELDING PORTION OF THE BUMPER COVER MOLD}

본 발명은 범퍼 커버 금형의 용접부 처리방법에 관한 것으로, 보다 상세하게는 범퍼 커버 금형의 용접후에 섭씨 620°의 템퍼링 온도로서 20시간을 가열하는 응력 제거작업을 실시하여 용접부에 크랙의 발생을 방지함으로써, 크랙 발생에 따른 보수 비용을 절감할 수 있는 범퍼 커버 금형의 용접부 처리방법에 관한 것이다.The present invention relates to a method of processing a welded portion of a bumper cover mold, and more particularly, by performing a stress removing operation of heating a 20 hour at a tempering temperature of 620 ° C after welding the bumper cover mold to prevent cracking of the welded portion. The present invention relates to a method of treating a welded part of a bumper cover mold, which can reduce maintenance costs due to crack generation.

일반적으로 사출금형 예컨대, 범퍼커버 금형의 가공은 기계가공과 방전가공의 조합으로 진행되는데, 이러한 사출금형의 기계가공 중에는 가공불량 및 설계의 불량에 의하여 추가되는 용접공정이 수시로 발생된다. 또한 상기 사출금형 가공이 완료된 후 제품의 폼질향상을 위한 형상 변경이 발생될 경우에는 추가적인 용접공정이 발생될 수 있으며, 이러한 용접공정시에는 용접부의 열처리가 함께 진행된다.In general, an injection mold, for example, a bumper cover mold is processed by a combination of machining and discharge machining. During machining of the injection mold, a welding process is often added due to a machining defect and a poor design. In addition, when the shape change to improve the foam quality of the product after the injection mold processing is completed, an additional welding process may occur, and during such a welding process, the heat treatment of the weld is performed together.

도 1은 종래 기술에 따른 범퍼 커버 금형의 용접부 처리방법을 개략적으로 도시한 흐름도이다.1 is a flow chart schematically showing a method for treating a welded portion of a bumper cover mold according to the prior art.

도 1에 도시된 바와 같이, 종래 범퍼 커버 금형의 용접부 처리방법은, 먼저 용접을 실시하고자 하는 대상물에 대략 섭씨 300~350°의 열로 예열 작업을 실시한다.(S1) 상기 단계(S1)의 예열 작업의 범위는 용접 대상부위를 중심으로 대략 30mm의 범위를 예열하게 된다.As shown in FIG. 1, in the conventional welding part treatment method of a bumper cover mold, first, a preheating operation is performed in a heat of approximately 300 to 350 ° C. on an object to be welded. (S1) Preheating of the step S1. The working range is preheated to a range of approximately 30 mm around the welded area.

이어서 상기 단계(S1)에서 예열된 용접 대상부위를 용접 실시한다.(S3) Subsequently, the welding target region preheated in the step S1 is welded.

그리고 상기 단계(S3)에서 용접된 부위를 대략 섭씨 300~350°의 열로 가열하는 후열과정을 실시한다.(S5)And the step (S5) performs a post-heating process for heating the welded portion to a heat of approximately 300 ~ 350 ° Celsius.

마지막으로, 상기 용접된 부위를 황삭 또는 정삭가공을 통하여 가공하여 후처리를 한다.(S7)Finally, the welded part is subjected to post-treatment by roughing or finishing. (S7)

그러나, 전술한 용접 부분의 특성은 모재와 동일한 물리적 성질 및 응력분포가 요구되지만, 용접과정중에 그 물리적인 성질 및 응력분포의 변동이 발생된다. 구체적으로 용접과정 탄소의 확산 및 융합부의 고온의 열이 상대적으로 온도가 낮은 모재측으로 급격이 이동하면서 융합부가 급랭되어 경화층이 형성된다. 따라서 이러한 경도 차이와 잔류 응력의 차이로 인하여 금형에 크랙이 발생될 수 있는 문제점이 있다.However, the above-described properties of the welded part require the same physical properties and stress distribution as the base material, but variations in the physical properties and stress distribution occur during the welding process. Specifically, while the welding process of carbon diffusion and the high temperature heat of the fusion portion is rapidly moved to the relatively low temperature of the base material, the fusion portion is quenched to form a hardened layer. Therefore, there is a problem that cracks may occur in the mold due to the difference in hardness and residual stress.

본 발명은 상기 전술한 바와 같은 문제점들을 해결하기 위해 창출된 것으로서, 범퍼 커버 금형등의 사출금형의 용접 작업시에 발생되는 크랙을 방지할 수 있는 범퍼 커버 금형의 용접부 처리방법을 제공하는데 그 목적이 있다.SUMMARY OF THE INVENTION The present invention has been made to solve the problems as described above, and the object of the present invention is to provide a method for processing a welded portion of a bumper cover mold that can prevent cracks generated during welding of an injection mold such as a bumper cover mold. have.

상기 목적을 달성하기 위한 본 발명의 범퍼 커버 금형의 용접부 처리방법은, 용접 대상물을 마르텐 사이트 변형 온도보다 높은 가열 온도로 예열하는 예열단계; 상기 가열온도로서 상기 용접 대상물의 용접층간의 온도를 동일하게 유지하며 용접을 실시하는 용접단계; 상기 단계에서 용접된 용접부위를 조질 처리에서 사용되는 템퍼링(Tempering) 온도로 일정시간 가열하는 후열단계; 상기 용접된 용접부를 가공하는 가공단계; 및 상기 템퍼링 온도를 이용하여 일정시간 가열하여 용접부의 응력을 제거하는 응력 제거단계를 포함한다.Welding part treatment method of the bumper cover mold of the present invention for achieving the above object, the preheating step of preheating the welding object to a heating temperature higher than the martensitic deformation temperature; A welding step of performing welding while maintaining the same temperature between the welding layers of the welding object as the heating temperature; A post-heating step of heating the welded portion welded in the step to a tempering temperature used in the tempering treatment for a predetermined time; Processing the welded weld; And a stress removing step of removing the stress of the welded portion by heating for a predetermined time by using the tempering temperature.

본 발명에 있어서, 상기 예열단계의 가열온도는 섭씨 320°내지 350°인 것을 특징으로 한다.In the present invention, the heating temperature of the preheating step is characterized in that 320 ° to 350 ° Celsius.

본 발명에 있어서, 상기 템퍼링 온도는 섭씨 620°인 것을 특징으로 한다.In the present invention, the tempering temperature is characterized in that 620 degrees Celsius.

본 발명에 있어서, 상기 후열단계는 섭씨 620°의 온도로 3시간 가열하는 것을 특징으로 한다.In the present invention, the post-heating step is characterized in that for 3 hours heating to a temperature of 620 degrees Celsius.

본 발명에 있어서, 상기 응력 제거단계는 섭씨 620°의 온도로 20시간 가열하는 것을 특징으로 한다.In the present invention, the stress removing step is characterized in that the heating for 20 hours to a temperature of 620 degrees Celsius.

본 발명에 있어서, 상기 응력 제거단계는 질소가 내재된 가스 침탄로에서 실시되어 산화층 형성을 방지하도록 하는 것을 특징으로 한다.In the present invention, the stress removing step is performed in a gas carburizing furnace containing nitrogen to prevent the formation of an oxide layer.

이하 본 발명의 바람직한 실시예에 따른 범퍼 커버 금형의 용접부 처리방법을 첨부된 도면을 참조하여 상세히 설명한다. 그러나 본 발명은 이하에서 개시되는 실시예에 한정되는 것이 아니라 서로 다른 다양한 형태로 구현될 것이며, 단지 본 실시예는 본 발명의 개시가 완전하도록 하며, 통상의 지식을 가진자에게 발명의 범주를 완전하게 알려주기 위해 제공되는 것이다.Hereinafter, a method of processing a welded part of a bumper cover mold according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the present embodiments are intended to complete the disclosure of the present invention and to those skilled in the art to fully understand the scope of the invention. It is provided to inform you.

도 2는 본 발명의 바람직한 실시예에 따른 범퍼 커버 금형의 용접부 처리방법을 개략적으로 도시한 흐름도이다.2 is a flow chart schematically showing a method for treating a welded part of a bumper cover mold according to an exemplary embodiment of the present invention.

도 2에 도시된 바와 같이, 본 발명에 따른 용접부 열처리 방법은, 먼저 용접 대상물을 마르텐 사이트 변형 온도보다 높은 가열온도로 예열한다.(S10) 상기 용접 대상물의 재질은 SCM440으로 구비됨이 바람직하다. 상기 SCM440 재질의 용접 대상물의 화학성분은 아래 표 1의 성분을 포함한다. 화 학 성 분 (wt,%) C Si Mn Cr Mo 0.32/0.38 0.20/0.40 0.60/1.40 1.60/2.00 0.40/0.60 상기 SCM440 재질의 용접대상물의 용접작업이 대략 섭씨3000°의 열에 의하여 행하여지는데, 상기 용접 실시된 용접부의 열처리로 인한 급랭에 따른 조직의 변화 즉, 마르텐 사이트 변형을 방지하기 위함이다. 그리고 상기 가열온도는 섭씨 320°내지 350°로 됨이 바람직하다. 상기 가열온도의 범위는 온도유지 효과를 향상시키기 위하여 용접부를 중심으로 대략 70mm이상의 범위까지 가열함이 바람직하다.As shown in FIG. 2, in the welding part heat treatment method according to the present invention, first, the welding object is preheated to a heating temperature higher than the martensitic deformation temperature. (S10) The material of the welding object is preferably provided as SCM440. The chemical composition of the welding object of the SCM440 material includes the components shown in Table 1 below. Chemical component (wt,%) C Si Mn Cr Mo 0.32 / 0.38 0.20 / 0.40 0.60 / 1.40 1.60 / 2.00 0.40 / 0.60 The welding operation of the welding object of the SCM440 material is performed by heat of approximately 3000 degrees Celsius, in order to prevent the change of the structure, that is, the deformation of martensite due to the rapid cooling due to the heat treatment of the welded welded portion. And the heating temperature is preferably 320 ° to 350 ° Celsius. The range of the heating temperature is preferably heated to a range of about 70mm or more around the weld to improve the temperature holding effect.

다음, 상기 가열온도 즉 섭씨 320°내지 350°의 온도로 용접대상물의 용접층간의 온도를 동일하게 유지하며 용접을 실시한다.(S20) 여기서 최대한 낮은 전류를 사용하여 용융온도를 낮게 한다.Next, the welding is performed while maintaining the same temperature between the welding layers of the object to be welded at the heating temperature, that is, 320 ° C to 350 ° C. (S20) Here, the melting temperature is lowered using the lowest current possible.

그리고, 상기 단계(S20)에서 용접된 용접부위를 조질 처리에서 사용되는 템퍼링(Tempering) 온도 즉 섭씨 620°의 온도로 3시간 이상 가열하는 후열단계를 실시한다.(S30) 상기 설정된 섭씨 620°의 온도는 범퍼커버 금형의 소재의 템퍼링 온도로서 용접직후의 크랙발생을 예방하기 위한 최적의 온도이다.In addition, a post-heating step of heating the welded welded at the step S20 to a tempering temperature, ie, a temperature of 620 ° C. or more, used in the tempering treatment is performed for 3 hours or more (S30). The temperature is the tempering temperature of the material of the bumper cover mold, which is an optimal temperature for preventing cracking immediately after welding.

여기서 상기 후열은 부분 후열로서 그 범위는 용접부를 중심으로 70mm이상 가열한다.The after heat is a partial after heat, the range is heated to more than 70mm around the weld.

다음, 상기 용접부에 가공을 실시한다.(S40) 여기서 가공은 황삭가공 또는 정삭가공등의 기계가공으로 실시됨이 바람직하다. 즉, 방전가공은 방전경화층이 형성되어 크랙발생이 유발되는 문제점이 있어 기계가공으로 가공을 실시함이 바람직하다.Next, the weld is processed. (S40) Here, the machining is preferably performed by machining such as roughing or finishing. In other words, in the discharge machining, there is a problem in that a crack is generated due to the formation of a discharge hardened layer, which is preferably performed by machining.

이어서, 상기 용접부의 템퍼링 온도인 섭씨 620°로서 20시간을 가열하여 용접부의 응력을 제거하는 응력제거 작업(STRESS RELIFE)을 실시한다.(S50) 상기 응력제거 작업은 질소가 내재된 PIT로에서 실시하도록 하여 산화층의 형성을 방지한다. Next, a STRESS RELIFE is performed to remove the stress of the weld by heating 20 hours at 620 degrees Celsius, which is the tempering temperature of the weld. This prevents the formation of the oxide layer.

상기와 같은 본 발명에 따른 범퍼 커버 금형의 용접부 처리방법은 다음과 같은 효과를 갖는다.The welding part treatment method of the bumper cover mold according to the present invention as described above has the following effects.

범퍼 커버 금형의 용접후에 섭씨 620°의 템퍼링 온도로서 20시간을 가열하는 응력 제거작업을 실시하여 용접부에 크랙의 발생을 방지함으로써, 크랙 발생에 따른 보수 비용을 절감할 수 있다.After welding the bumper cover mold by performing a stress relief operation of heating for 20 hours at a tempering temperature of 620 degrees Celsius to prevent the occurrence of cracks in the weld portion, it is possible to reduce the repair cost due to cracks.

이상, 본 발명을 도면에 도시된 실시예들을 참조하여 설명하였다. 그러나, 본 발명은 이에 한정되지 않고 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에 의해 본 발명과 균등한 범위에 속하는 다양한 변형예 또는 다른 실시예가 가능하다. 따라서, 본 발명의 진정한 보호범위는 이어지는 특허청구범위에 의해 정해져야 할 것이다. The present invention has been described above with reference to the embodiments shown in the drawings. However, the present invention is not limited thereto, and various modifications or other embodiments falling within the scope equivalent to the present invention are possible by those skilled in the art. Therefore, the true scope of protection of the present invention should be defined by the following claims.

도 1은 종래 기술에 따른 범퍼 커버 금형의 용접부 처리방법을 개략적으로 도시한 흐름도.1 is a flow chart schematically showing a method for treating a welded portion of a bumper cover mold according to the prior art.

도 2는 본 발명의 바람직한 실시예에 따른 범퍼 커버 금형의 용접부 처리방법을 개략적으로 도시한 흐름도.Figure 2 is a flow chart schematically showing a method of processing the weld portion of the bumper cover mold according to a preferred embodiment of the present invention.

Claims (6)

SCM440 재질의 용접 대상물을 마르텐 사이트 변형 온도보다 높은 가열 온도로 예열하는 예열단계;A preheating step of preheating the welding object of SCM440 material to a heating temperature higher than the martensitic deformation temperature; 상기 가열온도로서 상기 용접 대상물의 용접층간의 온도를 동일하게 유지하며 용접을 실시하는 용접단계;A welding step of performing welding while maintaining the same temperature between the welding layers of the welding object as the heating temperature; 상기 단계에서 용접된 용접부위를 조질 처리에서 사용되는 템퍼링(Tempering) 온도로 일정시간 가열하는 후열단계;A post-heating step of heating the welded portion welded in the step to a tempering temperature used in the tempering treatment for a predetermined time; 상기 용접된 용접부를 가공하는 가공단계; 및Processing the welded weld; And 상기 템퍼링 온도를 이용하여 일정시간 가열하여 용접부의 응력을 제거하는 응력 제거단계;를 포함하는 것을 특징으로 하는 범퍼 커버 금형의 용접부 처리방법.And a stress removing step of removing the stress of the welding portion by heating for a predetermined time by using the tempering temperature. 제1항에 있어서,The method of claim 1, 상기 예열단계의 가열온도는 섭씨 320°내지 350°인 것을 특징으로 하는 범퍼 커버 금형의 용접부 처리방법.The heating temperature of the preheating step is welded to the bumper cover mold, characterized in that 320 ° to 350 ° Celsius. 제1항에 있어서,The method of claim 1, 상기 템퍼링 온도는 섭씨 620°인 것을 특징으로 하는 범퍼 커버 금형의 용접부 처리방법.The tempering temperature is welded part processing method of the bumper cover mold, characterized in that 620 degrees Celsius. 제1항에 있어서,The method of claim 1, 상기 후열단계는 섭씨 620°의 온도로 3시간 가열하는 것을 특징으로 하는 범퍼 커버 금형의 용접부 처리방법.The after-heating step is a welding portion processing method of the bumper cover mold, characterized in that for 3 hours heating to a temperature of 620 degrees Celsius. 제1항에 있어서,The method of claim 1, 상기 응력 제거단계는 섭씨 620°의 온도로 20시간 가열하는 것을 특징으로 하는 범퍼 커버 금형의 용접부 처리방법.The stress relief step is a welding part processing method of the bumper cover mold, characterized in that for 20 hours heating to a temperature of 620 degrees Celsius. 제1항에 있어서,The method of claim 1, 상기 응력 제거단계는 질소가 내재된 PIT로에서 실시되어 산화층 형성을 방지하도록 하는 것을 특징으로 하는 범퍼 커버 금형의 용접부 처리방법.The stress removing step is carried out in a nitrogen-containing PIT furnace to prevent the formation of an oxide layer, the welding part treatment method of the bumper cover mold.
KR10-2001-0081238A 2001-12-19 2001-12-19 Treatment method for welding portion of the bumper cover mold KR100471215B1 (en)

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