KR102006372B1 - 균질화 단조품을 제조하는 구축 성형 방법 - Google Patents
균질화 단조품을 제조하는 구축 성형 방법 Download PDFInfo
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Abstract
Description
도 2는 본 발명의 실시예에 있어서 포개어 겹쳐서 용접후의 연속주조 빌렛을 나타내는 사진이다.
도 3은 본 발명의 실시예에 있어서 단조과정의 빌렛을 나타내는 사진이다.
도 4는 본 발명의 공예공정도이다. 여기서 (a)는 연속 주조 빌렛을 자르고, (b)는 용접할 표면을 평평하게 밀링 절삭하여 신선한 금속이 드러나도록 하고 플라즈마 세척을 진행하며, (c)는 진공실내에서 계면 주위를 전자빔으로 용접을 진행하고, (d)는 고온로(盧)에 넣어 가열하고 (e)는 액압프레스에서 업세팅 플레이트가 용접할 계면의 수직방향에 따라 업세팅하고, (f)는 규정된 형태로 변형한 후,빌렛에 작용하는 압력을 유지하며 결함을 충분히 용접시키고 (g)는 빌렛을 업세팅한 후 다시 고온확산을 시키고, (h) ~ (i)는 빌렛에 대해 삼방향 단조(三方向鍛造)를 실시하여 방향마다 대 변형을 보장하며, (j)는 빌렛을 최종 모양 및 사이즈로 단조하는 것을 나타낸다.
도 5는 본 발명의 실시예에 있어서 단조를 끝낸 후 원래 용접 계면 위치에 대응되는 금속조직을 나타낸다.
도 6은 비교예 1에 있어서 전통 강괴 단조후 획득한 빌렛 중심 위치 조직을 나타낸다.
도 7은 비교예 2에 있어서 전통 겹쳐 압연 방식을 이용해서 변형을 끝낸 후, 원래 용접계면위치에 대응되는 금속조직을 나타낸다. 여기서 (a)는 빌렛 중심구역, (b)는 빌렛 주변구역을 나타낸다.
원소 | C | Si | Mn | P | S | Cr | Ni | Mo | V |
성분 | 0.21 | 0.039 | 0.27 | 0.005 | 0.005 | 1.64 | 3.46 | 0.39 | 0.095 |
Claims (10)
- 균질화 단조품을 제조하는 구축 성형 방법으로서,
빌렛을 사전 제조하고, 복수개의 연속 주조 빌렛을 지정 사이즈로 절단하고, 밀링머신을 통해 용접할 표면을 평평하게 가공하여 진공플라즈마를 사용하여 세척하고, 빌렛을 포개서 합친 후 진공실내에서 용접할 표면 주위를 전자빔으로 용접한 다음에 빌렛을 단조용접하여 균질화하고, 용접한 빌렛을 지정온도로 가열한 후 화로에서 꺼내어 액압프레스에서 단조하는데, 초기 업세팅과정에서는 단조중 보압(鍛造中保壓), 단조간 보온(鍛造間保溫)의 조치를 채택하여 계면을 충분히 용접한 다음, 그 이후의 단조과정에서는 삼방향 단조(三方向鍛造)의 방법으로 용접한 계면을 분산시켜 계면의 성분, 조직, 및 개재물이 주물과 일치한 수준까지 도달하도록 하며, 마지막으로 빌렛을 최종 규격사이즈로 단조하여 성형하는 방법이며,
소정의 규격에 따라 연속 주조 빌렛을 절단하는 첫 번째 단계,
용접할 표면을 가공, 세척하는 두 번째 단계,
빌렛을 진공 전자빔으로 용접하는 세 번째 단계,
빌렛을 단조전에 가열하는 네 번째 단계,
빌렛을 업세팅 및 보압단조용접하는 다섯 번째 단계,
빌렛에 대해 고온하에서 확산 연결을 실시하는 여섯 번째 단계,
Y 방향에 따라 스트레칭 단조를 실시하는 일곱 번째 단계,
X 방향에 따라 스트레칭 단조를 실시하는 여덟 번째 단계,
Z 방향에 따라 스트레칭 단조를 실시하는 아홉 번째 단계, 및
빌렛을 최총 단조품의 사이즈로 단조 성형하는 열 번째 단계를 포함하는 것을 특징으로 하는 균질화 단조품을 제조하는 구축 성형 방법. - 제1항에 있어서,
첫번째 단계에 있어서, 연속 주조 빌렛을 절단할 때 길이와 넓이의 비율은 2:3 이고, 절단된 연속 주조 빌렛을 일정한 수량 준비한 후, 총 높이와 넓이의 비율이 2:1 되도록, 즉 넓이(X):길이(Y):높이(Z) = 2:3:4가 되도록, 삼방향 단조(三方向鍛造)를 실시하기 쉽게 포개어 합치는 것을 특징으로 하는 균질화 단조품을 제조하는 구축 성형 방법. - 제1항에 있어서,
두 번째 단계에 있어서, 플래노 밀러를 사용하여 용접할 표면을 가공한 다음에 진공실에 넣어 플라즈마를 사용해서 용접할 표면을 세척하여, 표면의 고도 청결을 보장하면서 신선한 금속이 드러나도록 하는 것을 특징으로 하는 균질화 단조품을 제조하는 구축 성형 방법. - 제1항에 있어서,
세 번째 단계에 있어서 빌렛을 진공실에 넣어 포개어 합치며, 용접할 표면 주위를 진공 전자빔으로 용접하는데, 용접심도가 10~50mm인 것을 특징으로 하는 균질화 단조품을 제조하는 구축 성형 방법. - 제1항에 있어서,
네 번째 단계에 있어서, 용접이 완성된 빌렛을 가열로에 넣어 가열하는데, 가열 온도는 0.85 Tm이고, 여기서, Tm 은 재료의 용점이고 단위는 ℃인 것을 특징으로 하는 균질화 단조품을 제조하는 구축 성형 방법. - 제1항에 있어서,
다섯 번째 단계에 있어서, 가열된 빌렛을 단압기계의 작업대 위에 높이방향이 수직방향과 일치하도록 배치하고, 업세팅 플레이트를 사용하여 높이 Z 방향에 따라 빌렛을 업세팅 하는데, 업세팅은 빌렛 총 높이의 10%를 압하시키도록, 빌렛에 작용하는 압력을 5min 유지하는 단계, 및 업세팅을 계속하여 빌렛의 높이가 원래 높이의 50%될 때 중지하는데 빌렛에 작용하는 압력을 10min 유지하는 단계를 포함하는 것을 특징으로 하는 균질화 단조품을 제조하는 구축 성형 방법. - 제1항에 있어서,
여섯 번째 단계에 있어서, 업세팅 된 빌렛을 가열로에 넣어 가열하는데, 가열온도는 0.85 Tm이며, 여기서 Tm 은 재료의 용점이고 단위는 ℃이고, 빌렛의 온도가 균일화된 후 20Th 시간 동안 보온하는데, 여기서 Th는 빌렛을 업세팅한 다음의 높이이고 단위는 m인 것을 특징으로 하는 균질화 단조품을 제조하는 구축 성형 방법. - 제1항에 있어서,
일곱 번째 단계에 있어서 플랫 앤빌을 사용하여 길이 Y 방향에 따라 강괴를 넓이(X):길이(Y):높이(Z) = 3:4:2의 육면체로 스트레칭하는 것을 특징으로 하는 균질화 단조품을 제조하는 구축 성형 방법. - 제1항에 있어서,
여덟 번째 단계에 있어서, 플랫 앤빌을 사용하여 길이 Y 방향에 따라 50% 업세팅하여, 지정 사이즈로 변형을 한 후, 넓이 X 방향에 따라 빌렛을 넓이(X) : 길이(Y) : 높이(Z) = 4:2:3의 육면체로 스트레칭하는 것을 특징으로 하는 균질화 단조품을 제조하는 구축 성형 방법. - 제1항에 있어서,
아홉 번째 단계에 있어서, 플랫 앤빌을 사용하여 높이 Z 방향에 따라 50% 업세팅하여, 지정 사이즈로 변형을 한 후, 높이 Z 방향에 따라 빌렛을 넓이(X) : 길이(Y) : 높이(Z) = 2:3:4의 육면체로 스트레칭하는 것을 특징으로 하는 균질화 단조품을 제조하는 구축 성형 방법.
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