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當前位置:不銹鋼鑄件鑄造性能
[來源:www.voipblast.net] [作者:精密鑄造] [日期:19-04-30]

不銹鋼鑄件鑄造性能較差,流動性差,體收縮和線收縮較大,熱應力大,容易產生裂紋。一旦鑄件產生裂紋,不僅返修工作量大,嚴重的還可能報廢,造成重大的經濟損失。鑄件裂紋的產生因素主要是鑄件結構、鑄造工藝等,生產中一般采用以下措施來加以預防: Stainless steel castings cast with poor performance, poor liquidity, volume shrinkage and linear shrinkage is larger, the thermal stress is big, easy to crack. Once the cracking formation of castings, the workload is big, not only repair serious may also scrapped, causing great economic losses. Casting cracks factors mainly casting structure, such as casting process, generally adopt the following measures to prevent in production: 1、鑄件結構 1, the structure of the casting   鑄造時要全面考慮鑄件的結構、形狀、大型、壁厚及其過渡等影響鑄件液態和固態收縮的因素,選擇適當的工藝參數,防止縮孔縮松等鑄造缺陷。鑄件的澆冒口系統設計要合理,若要采用冷鐵等工藝措施,其安放的部位要合理,既要保證鑄件內部組織的致密性,又要盡量避免應力集中的情況產生。 Should fully consider when casting casting structure, shape, large, wall thickness and transition effects such as factors of liquid and solid state contraction of castings, select the appropriate process parameters, to prevent the shrinkage cavity casting defects such as shrinkage. Castings poured riser system design is reasonable, if you want to use cold iron process measures, such as the site of setting to reasonable, both to ensure the density of the casting internal organization, and try to avoid stress concentration occurs. 2、熔煉 2, melting   熔煉過程中,盡量降低P、S等有害元素的含量,降低N、H、O等氣體和夾雜物含量。通過采用低磷鋼中間合金,可以起到很好的效果。 Smelting process, try to reduce the content of harmful elements such as P, S, lower N, H, O gas and inclusion content, etc. Through the adoption of low phosphorus steel intermediate alloy, can have very good effect. 3、保溫 3, heat preservation   通過適當延長鑄件在砂型中的保溫時間,主要是控制開箱溫度低于70℃,保證鑄件在砂型中充分完成液態和固態收縮,避免外力因素造成應力集中的情況發生。 Through appropriate to extend the time of castings in sand mold, heat preservation, mainly control box temperature below 70 ℃, ensure full completion of liquid and solid in the sand mould castings contraction, avoid stress concentration caused by external force factors. 4、落砂 4, shakeout   在鑄件落砂清理過程中,嚴禁打箱時向砂型和鑄件澆水,嚴禁采用撞箱等較強外力沖擊方式落砂,避免外力和鑄件內應力相互作用產生裂紋。 In the process of casting sand cleaning, do not play the box when watering the sand mould and casting, it is forbidden to use the strong external forces such as hit box shakeout impact way, avoid interaction force and the internal stress of the casting crack. 5、切割冒口 5, cutting riser   根據鑄件條件選擇適當的熱割澆冒口工藝方式,保證熱割起始溫度不低于300℃。操作時,氣割槍和吹氧管采用振動切割。重要件氣割后及時用石棉布蓋住隔口或進爐熱處理。對于上冠及軸流式葉片一類結構復雜、工藝上采取特殊措施的鑄件,采用二次熱割。 According to casting condition choose proper thermal poured riser cutting process, ensure hot cut starting temperature is not lower than 300 ℃. Operation, gas cutting and blowing oxygen tube using vibration cutting. Important thing in a timely manner after gas cutting with asbestos cloth cover every mouth or into the furnace heat treatment. For the champions league and the axial flow blades on a class of complex structure, process take special measures of castings, adopting secondary hot cut. 6、預熱 6, preheating   在對不銹鋼鑄件進行缺陷處理時,要堅持預熱原則。在吹、焊工序處理時,工件要預熱至108℃以上方可操作。若發現較大的裂紋缺陷,應先進行去應力退火,再進行處理。 In the processing of stainless steel castings defects, want to insist on the principle of preheating. When blowing process, welding process, the workpiece to preheat to 108 ℃ or more before operation. If discover the larger crack defects, should be conducted to stress relieving, again for processing. 7、退火 7, annealing   對重大不銹鋼鑄件須進行一次最終消除應力退火工序,嚴格控制保溫時間和出爐溫度。其目的是減少生產過程中產生新的應力集中,更加徹底地消除鑄件內應力,防止裂紋產生。 To a major stainless steel castings shall eventually eliminate stress annealing process, strictly control the heat preservation time and melt temperature. Its purpose is to reduce the production process of new stress concentration, the more thoroughly eliminate the internal stress of castings, to prevent the crack.

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