ugg milano Multi-step disk and low pressure castin

Multi-step low-pressure casting aluminum casting disc technology and parameters

Force, that is, the crystallization of low pressure casting can effectively inhibit the precipitation of gas in liquid metal, the higher the pressure, the more significant inhibitory effect. Therefore, the original solution containing the metal under the same gas volume, low pressure casting of P gas generally larger than other casting methods d ~ 141. Therefore, the needle larvae L degrees casting standards. Solve the needle under gravity casting larvae L defects. (3) low pressure casting, the filling speed can be adjusted to reduce the speed of the aluminum liquid filling the cavity in a laminar flow in the state, so that flow will not damage the surface of the oxide film, do not make the involvement of aluminum oxide slag solution, this would resolve the slag under gravity casting defects. In short, to low pressure casting, the elimination of loose under gravity casting, slag, pinholes and other defects. 6 Conclusion to low pressure casting, gravity casting, the radar base casting from the requirements of reach lI castings castings I upgraded to meet requirements, and the yield was 100%, and prove to determine the low-pressure process and process parameters are reasonable The. References: [1?? Chinese Mechanical Engineering Society Casting Branch Code. Special Casting Manual 2nd Edition [M??. Beijing: Mechanical Industry Press, 2004. [2?? Dongxiu Qi, Wang Chengzhi, Yuhai, et al. Low pressure and pressure casting theory and practice ??M]. Beijing: Ordnance Industry Press, 1995. [3?? song Wanchun, Qiguang Xia, Wang Hongwei, et al. Process design of low pressure and pressure parameters ??J]. Special Casting & Nonferrous Alloys, 1999,[link widoczny dla zalogowanych], (4) :26-28. [4?? Ju small, red text class. Casting by pressure casting method to achieve non-riser casting technology practice [J]. Special Casting & Nonferrous Alloys, 1992, (2): 26.28. Tin Crl2MoV steel forging and heat treatment before For ~ ngandHeatTreatmentofCr12MoVSteel Zhu Zheng (Nanjing Institute of Transport Technology, Nanjing 211188) Abstract: Crl2MoV steel is a typical cold-working die steel,[link widoczny dla zalogowanych], mainly used for various types of work components in the Die. Analyzed the properties of the materials. Failure combined with the mold situation,[link widoczny dla zalogowanych], explained the significance of its forging, heat treatment of the forging process and method, which is the production from the corresponding reference and guidance. Key words: Crl2MoV; die steel; forging; treatment CLC: TG316.12 Document code: B cold-working die steel is used to manufacture all kinds of deformation of metal at room temperature, the mold steel. The process of cold-working die in the process a lot of pressure to bear, bending, impact and friction, and, after processing of cold deformation processing of parts with little or no processing of the general. Thus the size of the mold requires high precision. Cold Work Die cutting edge of normal wear and tear is generally discarded. Also because of the impact and fracture, chipping and distortion tolerance and early retirement. Therefore, the cold-working die steel should have high hardness, high wear resistance, sufficient strength and toughness, heat deformation and high hardenability. Is widely used in the Crl2MoV steel is a typical cold-working die steel. 1Crl2MoV characteristics of steel Received Date :2009-05-06 Author: Zhu Zheng-cai (1962 a), Male, Nanjing, Jiangsu Province, Senior Engineer, Bachelor, Chinese Mechanical Engineering Society, in the mold of the teaching profession: Tel: 13814525910; E-mail: zzc1962 @ sohu. tom Article ID: 1001.3814 (2009) 19.0166.03Cr12MoV is Crl2 steel group, composition in Table 1. Table 1Crl2MoV chemical composition (mass fraction,[link widoczny dla zalogowanych],'') CMnSiCrVMO1.45 ~ 1.70 ?? 0.35 ?? O-3511 ~ 12. S0.15 ~ O-3O0.40 ~ O. 60 high carbon content can ensure the formation of a large number of alloy carbides, quenching, the part of the integration into the austenite, the increase in its stability, as well as alloying elements in martensite content increased, to ensure that its hardness; and carbides are not dissolved from the grain refinement to improve the toughness of the role. And increase the wear resistance of steel. Cr is the main alloying elements, which the hardenability of the steel increased significantly, improve the tempering stability, and produce secondary hardening phenomenon. Chromium and carbon to form high hardness (Cr, Fe) 7C carbide [1??, heating undissolved carbide grains can be refined to improve the role of the wear resistance of steel. Mo's role is to increase the hardenability of steel and grain refinement. V both grain refinement and improve the toughness, but also the formation of high hardness carbide VC, to further improve the wear resistance of steel. 166HotWorkingTechnology2009, Vo1.38,[link widoczny dla zalogowanych], No. 19

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