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GB/T 33878-2017: Steel cross wedge rolling -- Technological design principle Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 33878-2017: Steel cross wedge rolling -- Technological design principle---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT33878-2017GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.85 J 32 Steel Cross Wedge Rollings - Technological Design Principle Issued on: JULY 12, 2017 Implemented on: FEBRUARY 1, 2018 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration Committee of the People’s Republic of China. Table of ContentsForeword ... 3 1 Scope ... 4 2 Normative References ... 4 3 Terms and Definitions ... 4 4 Technological Design Principle ... 4ForewordThis Standard is drafted in accordance with stipulations in GB/T 1.1-2009. This Part is summarized by National Technical Committee 74 on Forging of Standardization Administration of China (SAC/TC 74). This Standard is mainly drafted by the following organizations. Hebei Dong An Jing Gong Co., Ltd., University of Science and Technology Beijing, Beijing Ke Da Ji Xiang Science and Technology Co., Ltd., Beijing Research Institute of Mechanical & Electrical Technology, Hubei Tri-ring Forging Co., Ltd., Dongfeng Forging Co., Ltd. The main drafters of this Standard include. Zhang Jungai, Zhang Kangsheng, Liyu, Liubo, Chen Wenjing, Deng Qingwen, Wu Yujian, Chenlin, Wang Guowen, Jiang Dechao, Jinhong, Zhoulin, Weiwei. Steel Cross Wedge Rollings - Technological Design Principle1 ScopeThis Standard specifies technological design principle of steel cross wedge rollings (hereinafter referred to as “rollings”), including technological design, determination of technological parameters, equipment selection, mold design and quality control. This Standard is applicable to steel hot rolled parts that are manufactured through the technology of cross wedge rolling.2 Normative ReferencesThe following documents are indispensable to the application of this Standard. In terms of references with a specified date, only versions with a specified date are applicable to this Standard. The latest version (including all the modifications) of references without a specified date is also applicable to this Standard. GB/T 8541 Terminology of Forging and Stamping GB/T 32258 Steel Cross Wedge Rollings - General Specification3 Terms and DefinitionsTerms and definitions that are defined in GB/T 8541 are applicable to this document.4 Technological Design Principle4.1 Technological Design 4.1.1 The manufacturing procedure of steel cross wedge rollings mainly includes. cutting - heating - rolling - hot alignment - thermal treatment - surface cleaning - cold straightening - sawing of finished product - inspection. The arrangement of the procedure shall consider the convenience of material flow throughout the whole manufacturing process; the control of manufacturing cost, the quality requirements from clients and the condition of equipment, etc. 4.1.2 Casual inspection shall be conducted in each procedure in accordance with product’s characteristics. 4.1.3 When it is impossible to implement hot alignment, pay attention to temperature In accordance with product requirements, select corresponding thermal treatment equipment. 4.3.6 Surface cleaning Suitable surface cleaning equipment can be selected in accordance with product dimension, texture, shape, surface quality and processing precision requirement, etc. 4.3.7 Cold straightening Select suitable equipment to conduct cold straightening on rolled parts with extremely low straightness accuracy. In addition, eliminate residual stress in accordance with clients’ requirements. 4.3.8 Sawing of finished product Toothless saw and band sawing machine can be adopted. When toothless saw is used, prevent over-burned tissue around the sawed area. 4.4 Mold Design 4.4.1 In the selection of mold parameters, including the forming angle (ɑ) and widening angle (β), several factors shall be comprehensively considered, such as the percentage reduction of area (ψ) of rolled parts, length of roll face and avoidance of product defects, etc. The forming angle shall be selected within the range of 18° ~ 34°; the widening angle shall be selected within the range of 4° ~ 12°. 4.4.2 Try to make sure cavities on both sides of the mold are the same. In terms of relatively short axial asymmetrical workpieces, combine 2 or more workpieces to make them symmetrical, then, start rolling. 4.4.3 Place the side that is not involved in rolling, or the side that manifests slight deformation, on the end of the rolled parts, so that the loss of head materials can be reduced. 4.4.4 When the percentage reduction of area is greater than 80%, the design method of secondary wedge or reduced forming angle can be adopted. 4.4.5 In terms of parts that will easily lead to defects like loosening and hollowness, increase the forming angle. 4.4.6 In order to decrease spiral mark, a transition fillet R can be designed between the forming surface and the top surface. 4.4.7 In order to guarantee the rotation of rolled parts, anti-slip mark can be added on the bevel of the forming angle. 4.4.8 An unloading segment shall be designed on the mold, so that distortion of ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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