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            當前位置:首頁>新聞中心>新聞動態>熱作模具鋼應具備下列底子特性

            熱作模具鋼應具備下列底子特性

            來源:http://www.environmentandpeople.net/ 日期:2021-03-25 發布人:admin


            熱作模具在作業時接受著很大的沖擊力,模腔和高溫金屬接觸,反復地加熱和冷卻,其運用條件極點惡劣。為了滿足熱作模具的運用要求,熱作模具鋼應具備下列底子特性:
            The hot working die is subjected to great impact force during operation. The die cavity contacts with high temperature metal and is heated and cooled repeatedly, so its operation condition is extremely bad. In order to meet the application requirements of hot working die, hot working die steel should have the following basic characteristics:
            1、較高的高溫強度和出色的耐性。熱作模具,尤其是熱鍛模,作業時接受很大的沖擊力,并且沖擊頻率很高,假設模具沒有高的強度和出色的耐性,就簡單開裂。
            1. High temperature strength and excellent resistance. Hot working dies, especially hot forging dies, are subject to great impact force and high impact frequency during operation. Assuming that the dies do not have high strength and excellent resistance, they will simply crack.
            2、出色的耐磨功用,由于熱作模具丁作時除遭到毛坯變形時發生沖突磨損之外,還遭到高溫氧化腐蝕和氧化鐵屑的研磨,所以需求熱作模具鋼有較高的硬度和抗黏附性。
            2. Due to the excellent wear-resistant function, the hot working die steel is required to have high hardness and anti adhesion because it is not only subject to conflict wear when the blank is deformed, but also subject to high-temperature oxidation corrosion and grinding of iron oxide chips.
            3、高的熱穩定性。熱穩定性是指鋼材在高溫下可長時刻堅持其常溫力學功用的才能。熱作模具作業時,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,不然模具就會發生塑性變形,造成堆塌而失效。
            3. High thermal stability. Thermal stability refers to the ability of steel to adhere to its mechanical function at room temperature for a long time at high temperature. When the hot working die works, the contact is hot metal, even liquid metal, so the surface temperature of the die is very high, generally 400 ~ 700 ℃. This requires that the hot work die steel does not heat at high temperature and has high thermal stability, otherwise the die will have plastic deformation, resulting in collapse and failure.
            4、優異的耐熱疲乏性,熱作模具的作業特點是反復受熱受冷,模具一時受熱脹大,一時又冷卻縮短,構成很大的熱應力,并且這種熱應力是方向相反,替換發生的。在反復熱應力作用下,模具表面會構成網狀裂紋(龜裂),這種現象稱為熱疲乏,模具因熱疲乏而過早地開裂,是熱作模具失效的主要原因之一。所以熱作模具鋼有必要要有出色的熱疲乏性。
            4. Excellent heat resistance and fatigue. The operation characteristics of hot working die are repeated heating and cooling. The die is subject to large thermal expansion at one time and short cooling at one time, which forms a large thermal stress. Moreover, the direction of this thermal stress is opposite and the replacement occurs. Under the action of repeated thermal stress, the surface of the die will form a network crack (cracking), which is called thermal fatigue. The premature cracking of the die due to thermal fatigue is one of the main reasons for the failure of the hot working die. Therefore, it is necessary for hot work die steel to have excellent thermal fatigue.
            5、高淬透性。熱作模具一般尺度比較大,熱鍛模尤其是這樣,為了使整個模具截面的力學功用均勻,這就要求熱作模具鋼有高的淬透功用。
            5. High hardenability. Hot working die generally has a large scale, especially for hot forging die. In order to make the mechanical function of the whole die section uniform, it requires high hardenability of hot working die steel.
            6、出色的導熱性。為了使模具不致積熱過多,導致力學功用下降,要盡或許降低模面溫度,減小模具內部的溫差,這就要求熱作模具鋼要有出色的導熱件能。
            6. Excellent thermal conductivity. In order to avoid excessive heat accumulation in the die and decrease the mechanical function, it is necessary to reduce the temperature of the die surface and the temperature difference inside the die as much as possible, which requires that the hot work die steel should have excellent thermal conductivity.
            7、出色的成形加工工藝功用,以滿足加工成形的需求。
            7. Excellent forming process function to meet the needs of forming.

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