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热加工 Pengerjaan panas Warmumformung Varmbearbetning Hot working
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In metallurgy, hot working refers to processes where metals are plastically deformed above their recrystallization temperature. Being above the recrystallization temperature allows the material to recrystallize during deformation. This is important because recrystallization keeps the materials from strain hardening, which ultimately keeps the yield strength and hardness low and ductility high. This contrasts with cold working. Many kinds of working, including rolling, forging, extrusion, and drawing, can be done with hot metal. 热加工是相对于机械加工而言的，一般是在较高的温度下将金属软化或熔化处理后再冷却至常温的成形技术，常见的是凝固成形（铸造）、连接技术（焊接）和塑性成形（锻压和冲压）。热加工成形过程中，模具起着极其重要的作用，从而又衍生出了模具设计和加工技术。 Mit Warmumformung werden all diejenigen Umformschritte bezeichnet, die oberhalb der Rekristallisationstemperatur eines Metalls stattfinden. Die während der Umformung ablaufende Verfestigung wird durch während und nach dem Umformschritt ablaufende Erholungs- und Entfestigungsprozesse begleitet. Dadurch können sehr hohe Umformgrade erreicht werden. Verfahren der Warmumformung können unter anderem sein: * Schmieden * Warmwalzen * Strangpressen * Formhärten Varmbearbetning eller varmformning innefattar olika typer av plastisk bearbetning av metaller vid temperaturer över rekristallisationstemperatur (ex. för stål mellan 600 och 900 °C och för bly vid rumstemperatur). Detta sker för stål vanligen genom valsning eller smidning, vid temperaturer som innebär att stålet är mjukt (800-1250°C, beroende bl.a. på ståltyp).
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热加工是相对于机械加工而言的，一般是在较高的温度下将金属软化或熔化处理后再冷却至常温的成形技术，常见的是凝固成形（铸造）、连接技术（焊接）和塑性成形（锻压和冲压）。热加工成形过程中，模具起着极其重要的作用，从而又衍生出了模具设计和加工技术。 Mit Warmumformung werden all diejenigen Umformschritte bezeichnet, die oberhalb der Rekristallisationstemperatur eines Metalls stattfinden. Die während der Umformung ablaufende Verfestigung wird durch während und nach dem Umformschritt ablaufende Erholungs- und Entfestigungsprozesse begleitet. Dadurch können sehr hohe Umformgrade erreicht werden. Verfahren der Warmumformung können unter anderem sein: * Schmieden * Warmwalzen * Strangpressen * Formhärten In metallurgy, hot working refers to processes where metals are plastically deformed above their recrystallization temperature. Being above the recrystallization temperature allows the material to recrystallize during deformation. This is important because recrystallization keeps the materials from strain hardening, which ultimately keeps the yield strength and hardness low and ductility high. This contrasts with cold working. Many kinds of working, including rolling, forging, extrusion, and drawing, can be done with hot metal. Varmbearbetning eller varmformning innefattar olika typer av plastisk bearbetning av metaller vid temperaturer över rekristallisationstemperatur (ex. för stål mellan 600 och 900 °C och för bly vid rumstemperatur). Detta sker för stål vanligen genom valsning eller smidning, vid temperaturer som innebär att stålet är mjukt (800-1250°C, beroende bl.a. på ståltyp). Syftet med varmbearbetning är både att, med låga krafter, ge det varma metallstycket en viss form samt att förbättra materialegenskaperna. Utgångsmaterialet för varmformning kan vara ett kokillgjutet ämne (ex. göt, eller stränggjutet ämne). Under den plastiska bearbetningen bryts gjutstrukturen ned, materialet rekristalliserar och kornstorleken minskar. Samtidigt utjämnas också s.k. segringar (ojämnheter i kemisk sammansättning) och porer välls samman. Efter varmbearbetningen är materialet starkare än efter gjutningen och avsevärt mer duktilt (motståndskraftigt mot sprickbildning/formbart). Efter varmbearbetning som exempelvis varmvalsning kan materialet bearbetas ytterligare i form av kallbearbetning, exempelvis kallvalsning, vilket förhöjer styrkan i materialet ytterligare samt ger finare tolerans på bearbetningen.
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