1. <em id="513jp"><acronym id="513jp"><u id="513jp"></u></acronym></em>
          <button id="513jp"></button><button id="513jp"><acronym id="513jp"><input id="513jp"></input></acronym></button>

          <th id="513jp"></th>
        1. 您好,歡迎訪問濟南七和模具有限公司 !

          濟南七和模具有限公司

          主做模具鋼材生產研發,保障質量

          全國服務熱線

          4008379668

            當前位置:首頁>新聞中心>新聞動態>熱作模具鋼工作條件帶來的兩方面問題

            熱作模具鋼工作條件帶來的兩方面問題

            來源:http://www.environmentandpeople.net/ 日期:2020-12-07 發布人:admin


            熱作模具包括錘鍛模、熱擠壓模和壓鑄模三類。熱作模具工作條件的主要特點是與熱態金屬相接觸、這是與冷作模具工作條件的主要區別。因此會帶來以下兩方面的問題:
            Hot working dies include hammer forging die, hot extrusion die and die casting die. The main characteristic of working conditions of hot working dies is contact with hot metal, which is the main difference between working conditions of hot working dies and cold working dies. Therefore, there will be two problems as follows:
            (l)模腔表層金屬受熱。通常錘鍛模工作時.其模腔表面溫度可達300~400℃以上熱擠壓??蛇_500一800℃以上;壓鑄模模腔溫度與壓鑄材料種類及澆注溫度有關。如壓鑄黑色金屬時模腔溫度可達1000℃以上。這樣高的使用溫度會使模腔表面硬度和強度顯著降低,在使用中易發生打垛。為此.對熱模具鋼的基本使用性能要求是熱塑變抗力高,包括高溫硬度和高溫強度、高的熱塑變抗力,實際上反映了鋼的高回火穩定性。由此便可以找到熱模具鋼合金化的第一種途徑,即加入Cr、W、Si.等合金元素可以提高鋼的回火穩定性。
            (l) The surface metal of die cavity is heated. In general, the surface temperature of die cavity of hammer forging die can reach 300 ~ 400 ℃ or above, and hot extrusion die can reach 500 ~ 800 ℃. The cavity temperature of die casting die is related to the type of die casting material and pouring temperature. For example, the temperature of die cavity can be over 1000 ℃ when casting ferrous metal. Such a high temperature will make the surface hardness and strength of the die cavity significantly reduced, and it is easy to stack in use. Therefore, the basic performance requirement of hot die steel is high thermoplastic deformation resistance, including high temperature hardness and high temperature strength, high thermoplastic deformation resistance, which actually reflects the high tempering stability of steel. Therefore, the first way of alloying hot die steel can be found, that is, adding CR, W, Si and other alloy elements can improve the tempering stability of the steel.
            山東熱作模具鋼
            (2)模腔表層金屬產生熱疲勞(龜裂)。熱模的工作特點是具有間歇性.每次使熱態金屬成形后都要用水、油、空氣等介質冷卻模腔的表面。因此.熱模的工作狀態是反復受熱和冷卻,從而使模腔表層金屬產生反復的熱脹冷縮,即反復承受拉壓應力作用.其結果引起模腔表面出現龜裂,稱為熱疲勞現象,由此,對熱模具鋼提出了第二個基本使用性能要求.即具有高的熱疲勞抗力。一般說來,影響鋼的熱疲勞抗力的因素主要有:
            (2) Thermal fatigue (cracking) occurs on the surface metal of die cavity. The working characteristic of hot die is intermittency. The surface of die cavity must be cooled by water, oil, air and other media every time hot metal is formed. Therefore, the working state of the hot die is repeated heating and cooling, so that the surface metal of the die cavity will produce repeated thermal expansion and cold contraction, that is, repeatedly bear the tensile and compressive stress. As a result, cracks appear on the surface of the die cavity, which is called thermal fatigue phenomenon. Therefore, the second basic performance requirement for hot die steel is put forward, that is, high thermal fatigue resistance. Generally speaking, the main factors affecting the thermal fatigue resistance of steel are as follows:
            ①鋼的導熱性。鋼的導熱性高,可使模具表層金屬受熱程度降低,從而減小鋼的熱疲勞傾向性。一般認為鋼的導熱性與合碳量有關,含碳量高時導熱性低,所以熱作模具鋼不宜采用高碳鋼。在生產中通常采用中碳鋼(C0.3%5~0.6%)合碳量過低.會導致鋼的硬度和強度下降.也是不利的.
            ① Thermal conductivity of steel. The high thermal conductivity of steel can reduce the heating degree of the surface metal of the die, thus reducing the thermal fatigue tendency of the steel. It is generally considered that the thermal conductivity of steel is related to the carbon content, and the thermal conductivity is low when the carbon content is high. Therefore, high carbon steel is not suitable for hot working die steel. In production, medium carbon steel (c0.3% 5 ~ 0.6%) is usually used. If the carbon content is too low, the hardness and strength of steel will be decreased, which is also unfavorable
            ②鋼的臨界點影響。通常鋼的臨界點(Acl)越高.鋼的熱疲勞傾向性越低。因此.一般通過加入合金元素Cr、W、Si、引來提高鋼的臨界點。從而提高鋼的熱疲勞抗力.
            ② Critical point effect of steel. Generally, the higher the critical point (ACL) of steel is, the lower the thermal fatigue tendency of steel is. Therefore, the critical point of steel is generally increased by adding alloying elements Cr, W, Si and lead. So as to improve the thermal fatigue resistance of steel

            咨詢熱線:4008379668

            郵箱:qihemuju@163.com

            地址:山東省濟南市鮑山辦事處簡家屯村內村委會向西50米

            備案:魯ICP備19056638號-1

            技術支持:網站建設·推廣運營?

            流量統計:

            網站地圖    TXT    XML

            七和模具二維碼

            七和模具二維碼

            91精品国产综合久久精品

              1. <em id="513jp"><acronym id="513jp"><u id="513jp"></u></acronym></em>
                  <button id="513jp"></button><button id="513jp"><acronym id="513jp"><input id="513jp"></input></acronym></button>

                  <th id="513jp"></th>