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            塑料模具鋼有哪些特性?

            來源:http://www.pyzhcc.com/ 日期:2021-06-28 發布人:admin


            塑料制品在工業及日常生活中得到了廣泛應用,塑料模具已向精 密化、大型化和多型腔化的方向發展,對塑料模具鋼的性能要求越來越高,一些工業發達國家已有獨立的塑料模具鋼種系列。
            Plastic products have been widely used in industry and daily life. Plastic mold has been developed to the direction of precision, large-scale and multi cavity. The performance requirements of plastic mold steel are higher and higher. Some industrial developed countries have independent plastic mold steel series.
            塑料模具鋼的性能應根據塑料種類、制品用途、成型方法和生產批量大小而定。一般要求熱處理工藝簡便,熱處理變形小或者不變形,預硬狀態的切削加工性能好,鏡面拋光性能和圖案蝕刻性能優良,表面粗糙度低,使用壽命長。
            The properties of plastic mould steel should be determined according to the type of plastic, the use of products, the forming method and the production batch size. Generally, it requires simple heat treatment process, little or no deformation, good cutting performance in pre hardened state, excellent mirror polishing performance and pattern etching performance, low surface roughness and long service life.
            ①切削加工性能
            ① Machinability
            對于大型、復雜和精 密的擠壓和注射模具,通常預硬化到28-35HRC之間,再進行切削和磨削加工至所要求的尺寸和精度后,直接投入使用,從而避免了熱處理變形、氧化和脫碳的缺陷。加入易切削元素S、Co和稀土,用以改善硬鋼的切削加工性能。
            For large, complex and precise extrusion and injection moulds, they are usually pre hardened to 28-35hrc, then cut and ground to the required size and accuracy, and then directly put into use, so as to avoid the defects of heat treatment deformation, oxidation and decarburization. Free cutting elements s, CO and re are added to improve the machinability of hard steel.
            ②鏡面加工性能
            ② Mirror processing performance
            激光盤和塑料透鏡等塑料制品的表面粗糙度要求很高,主要由模具型腔的粗糙度來保證,一般模具型腔的粗糙度要比塑料制品的高一 級。模具鋼的鏡面加工性能與鋼的純潔度、組織、硬度和鏡面加工技術有關。硬度高、顯微組織細小而均勻、非金屬夾雜少,均有利于提高鏡面拋光性。鏡面拋光性要求高的塑料模具鋼常采用真空熔煉或真空除氣。
            The surface roughness of plastic products such as laser disk and plastic lens is very high, which is mainly guaranteed by the roughness of mold cavity. Generally, the roughness of mold cavity is one level higher than that of plastic products. The mirror finishing performance of die steel is related to the purity, microstructure, hardness and mirror finishing technology of the steel. High hardness, fine and uniform microstructure, less non-metallic inclusions are conducive to improve the mirror polishing. Vacuum melting or degassing is often used for plastic mould steel with high requirement of mirror polishing.
            ③圖案蝕刻性能
            ③ Pattern etching performance
            某些塑料制品表面要求呈現清晰而豐滿的圖案花紋,還有皮革工業中的大型皮紋壓花版,都要求模具鋼有良好的圖案光刻性能,圖案光刻性能對材質的要求與鏡面拋光性能相似,鋼的純潔訂要高,組織要致密,硬度要高。
            The surface of some plastic products is required to present clear and full patterns, and the large-scale leather embossing plate in the leather industry requires the mold steel to have good pattern lithography performance. The requirements of pattern lithography performance for materials are similar to mirror polishing performance. The purity of steel should be high, the structure should be compact, and the hardness should be high.
            ④耐蝕性能
            ④ Corrosion resistance
            含氯和氟的樹脂以及在ABS樹脂中添加抗燃劑時,在成型過程中將釋放出有腐蝕性的氣體。對于這類塑料模具要選用耐蝕塑料模具鋼或表面鍍鉻或采用鎳磷非晶態表面涂層。
            The corrosive gas will be released in the molding process when the resin containing chlorine and fluorine and the flame retardant is added to ABS resin. For this kind of plastic mould, corrosion-resistant plastic mould steel or chromium plating or nickel phosphorus amorphous surface coating should be selected.

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