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            熱作模具鋼的性能要求有什么

            來源:http://www.environmentandpeople.net/ 日期:2020-11-19 發布人:admin


            熱作模具鋼是指適宜于制作對金屬進行熱變形加工的模具用的合金工具鋼,如熱鍛模、熱擠壓模、壓鑄模、熱鐓模等。由于熱作模具長時間處于高溫高壓條件下工作,因此,要求模具材料具有更高的強度、硬度及熱穩定性,特別是要有高熱強性、熱疲勞性、韌性和耐磨性。
            Hot working die steel refers to the alloy tool steel suitable for making dies for hot deformation of metal, such as hot forging die, hot extrusion die, die casting die, hot upsetting die, etc. Because the hot working die has been working under high temperature and high pressure for a long time, the die material is required to have higher strength, hardness and thermal stability, especially high thermal strength, thermal fatigue, toughness and wear resistance.
            熱作模具在工作時承受著很大的沖擊力,模腔和高溫金屬接觸,反復地加熱和冷卻,其使用條件極其惡劣。為了滿足熱作模具的使用要求,熱作模具鋼應具備下列基本特性:
            The hot working die bears a great impact force when it works. The mold cavity contacts with the high temperature metal and repeatedly heats and cools, so the working conditions are extremely bad. In order to meet the requirements of hot working die, hot work die steel should have the following basic characteristics:
            (1)高的熱穩定性。熱穩定性是指鋼材在高溫下可長時間保持其常溫力學性能的能力。熱作模具工作時,接觸的是熾熱的金屬,甚至是液態金屬,所以模具表面溫度很高,一般為400~700℃。這就要求熱作模具鋼在高溫下不發生熱化,具有高的熱穩定性,否則模具就會發生塑性變形,造成堆塌而失效。
            (1) High thermal stability. Thermal stability refers to the ability of steel to maintain its mechanical properties at room temperature for a long time at high temperature. When hot working die works, it contacts hot metal, even liquid metal, so the surface temperature of die is very high, generally 400-700 ℃. This requires that the hot working die steel does not heat at high temperature and has high thermal stability, otherwise the die will be plastic deformation, resulting in collapse and failure.

            山東熱作模具鋼
            (2)優良的耐熱疲勞性,熱作模具的工作特點是反復受熱受冷,模具一時受熱膨脹,一時又冷卻收縮,形成很大的熱應力,而且這種熱應力是方向相反,交替產生的。在反復熱應力作用下,模具表面會形成網狀裂紋(龜裂),這種現象稱為熱疲勞,模具因熱疲勞而過早地斷裂,是熱作模具失效的主要原因之一。所以熱作模具鋼必須要有良好的熱疲勞性。
            (2) The working characteristic of the hot working die is that it is heated and cooled repeatedly, and the die expands when heated and shrinks at the same time, forming a large thermal stress, and the thermal stress is produced alternately in the opposite direction. Under the action of repeated thermal stress, the surface of die will form network cracks (cracking), which is called thermal fatigue. The premature fracture of die due to thermal fatigue is one of the main reasons for the failure of hot working die. Therefore, hot working die steel must have good thermal fatigue.
            (3)較高的高溫強度和良好的韌性。熱作模具,尤其是熱鍛模,工作時承受很大的沖擊力,而且沖擊頻率很高,如果模具沒有高的強度和良好的韌性,就容易開裂。
            (3) High temperature strength and good toughness. The hot working die, especially the hot forging die, bears a great impact force when it works, and the impact frequency is very high. If the die does not have high strength and good toughness, it is easy to crack.
            (4)良好的耐磨性能,由于熱作模具制作時除受到毛坯變形時產生摩擦磨損之外,還受到高溫氧化腐蝕和氧化鐵屑的研磨,所以需要熱作模具鋼有較高的硬度和抗黏附性。
            (4) Good wear resistance, because the hot working die is not only subject to friction and wear when the blank is deformed, but also subject to high temperature oxidation corrosion and iron oxide chips grinding, so hot work die steel is required to have high hardness and adhesion resistance.
            (5)良好的導熱性。為了使模具不致積熱過多,導致力學性能下降,要盡可能降低模面溫度,減小模具內部的溫差,這就要求熱作模具鋼要有良好的導熱件能。
            (5) Good thermal conductivity. In order to make the die not accumulate too much heat, leading to the decline of mechanical properties, it is necessary to reduce the die surface temperature and the temperature difference inside the mold as far as possible, which requires the hot working die steel to have good heat conduction performance.
            (6)良好的成形加工工藝性能,以滿足加工成形的需要。
            (6) In order to meet the needs of processing and forming, good forming process performance is needed.
            (7)高淬透性。熱作模具鋼一般尺寸比較大,熱鍛模尤其是這樣,為了使整個模具截面的力學性能均勻,這就要求熱作模具鋼有高的淬透性能。
            (7) High hardenability. Hot work die steel is generally large in size, especially in hot forging die. In order to make the mechanical properties of the whole die section uniform, it requires high hardenability of hot work die steel.

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