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            當前位置:首頁>新聞中心>新聞動態>冷作模具鋼材熱疲勞性能反映材料

            冷作模具鋼材熱疲勞性能反映材料

            來源:http://www.pyzhcc.com/ 日期:2021-06-18 發布人:admin


            冷作模具鋼的硬度是模具鋼的主要技術指標,模具一定具有足夠高的硬度,以在高應力作用下保持其形狀和尺寸不變。冷作模具鋼在室溫下硬度一般保持在HRC60左右,熱加工模具鋼根據其工作條件一般要求保持在HRC40~55以內。
            The hardness of cold working die steel is the main technical index of die steel. The die must have enough hardness to keep its shape and size unchanged under high stress. The hardness of cold working die steel is generally kept around HRC60 at room temperature, and that of hot working die steel is generally kept within hrc40 ~ 55 according to its working conditions.
            對于同一鋼種,在一定的硬度值范圍內,硬度與變形抗力成正比;但硬度相同、成分和組織不同的鋼,其抗塑性變形能力可能存在明顯差異。紅色硬度高溫下工作的熱作模具需要保持其結構和性能穩定,以保持足夠的硬度。這種性質稱為紅色硬度。
            For the same steel, in a certain range of hardness value, the hardness is proportional to the deformation resistance; However, the plastic deformation resistance of steels with the same hardness, different composition and microstructure may be significantly different. The hot working die with red hardness working at high temperature needs to keep its structure and performance stable to keep enough hardness. This property is called red hardness.
            冷作模具鋼
            冷作模具鋼
            Cold working die steel
            碳素工具鋼和低合金工具鋼可在180~250℃的溫度范圍內保持這一性能,鉻鉬熱作模具鋼可在550~600℃的溫度范圍內保持這一性能。鋼的紅色硬度主要取決于其化學成分和熱處理工藝。抗壓屈服強度和抗壓彎曲強度模具在使用過程中經常受到高強度壓力和彎曲,因此要求模具材料要有一定的抗壓強度和彎曲強度。
            Carbon tool steel and low alloy tool steel can keep this property in the temperature range of 180 ~ 250 ℃, and Cr Mo hot working die steel can keep this property in the temperature range of 550 ~ 600 ℃. The red hardness of steel mainly depends on its chemical composition and heat treatment process. Compressive yield strength and compressive bending strength the die is often subjected to high strength pressure and bending in the process of use, so the die material is required to have a certain compressive strength and bending strength.
            在很多情況下,壓縮試驗和彎曲試驗的條件與模具的實際工作條件比較接近(例如,所測得的模具鋼的壓縮屈服強度與沖頭工作時的抗變形能力很吻合)。彎曲試驗的另一個優點是應變值大,可以靈敏地反映不同鋼種之間以及不同熱處理和顯微組織條件下的變形抗力差異。在工作過程中,模具承受沖擊載荷。為了減少斷裂和崩邊形式的損傷,要求模具鋼具有一定的韌性。
            In many cases, the compression test and bending test conditions are close to the actual working conditions of the die (for example, the measured compression yield strength of die steel is very consistent with the deformation resistance of the punch). Another advantage of bending test is that the strain value is large, which can sensitively reflect the deformation resistance difference between different steel grades and under different heat treatment and microstructure conditions. In the working process, the die bears the impact load. In order to reduce the damage of fracture and edge collapse, the die steel is required to have certain toughness.
            模具鋼的化學成分、晶粒尺寸、純度、數量、形態、碳化物和夾雜物的大小和分布、熱處理制度和金相組織對鋼的韌性有很大影響。尤其是鋼的純凈度和熱加工變形對其橫向韌性的影響更為明顯。
            The chemical composition, grain size, purity, quantity, morphology, size and distribution of carbides and inclusions, heat treatment system and microstructure of die steel have great influence on the toughness of the steel. In particular, the influence of steel purity and hot working deformation on its transverse toughness is more obvious.
            鋼的韌性、強度和耐磨性往往是矛盾的。因此,需要合理選擇鋼的化學成分,采用合理的精煉、熱加工和熱處理工藝,使模具材料的耐磨性、強度和韌性達到匹配。
            Toughness, strength and wear resistance of steel are often contradictory. Therefore, it is necessary to select the chemical composition of the steel reasonably and adopt reasonable refining, hot working and heat treatment processes to match the wear resistance, strength and toughness of the die material.

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