Including the appearance of quality, intrinsic quality and quality in use. Appearance quality means casting surface roughness, surface defects, size deviation, form deviation, weight deviation; mainly refers to the intrinsic quality of the casting chemical composition, physical properties, mechanical properties, microstructure and the presence in the cast of the interior holes, cracks, inclusions, segregation cases; refers to the use of quality casting under different conditions of work endurance 150kn bollard, including wear resistance, corrosion resistance, spalling, fatigue, shock-absorbing properties and machinability, weldability process performance . Sand casting casting defects are: cold shut, inadequate water, porosity, sticky sand, gravel, sand holes, swelling sand. Vent gas not escape in time before the molten metal crust, generating holes in the casting defect type. Pore ??wall is smooth, bright colors or with a slight oxidation. After casting porosity, it will reduce its effective bearing area, and in the pores can cause stress concentration around the casting reduce impact and fatigue resistance. Casting porosity also reduces density, resulting in some of the requirements to withstand water pressure test castings scrapped. Also 750kn bollard, porosity also have an adverse effect on the casting of corrosion resistance and heat resistance. Casting figure is reflected in the actual casting size, shape and technical requirements pattern bollard, it is casting, mainly based casting inspection and acceptance; Fig generally cast by the casting process manufacturers in the product development stage, according to the product drawings, product draft angle increases, the allowance based on the diagram, not cast out pattern holes, slots, and the size and other technical requirements as casting, casting inspection and acceptance of the product, or on customer requirements and product plans have together sent to casting factory acceptance as a product basis. Drawing (1) in the casting indicated by a thick solid line in FIG casting contour; parts represented with a fine two-dot chain line shape; between the thick solid line and thin two-dot chain line dimension allowance values; in cross-section The figure represents allowance or cast holes, slots, etc. with the grid lines. (2) size Tagging mostly part size as the benchmark; the actual size marked on the cast parts diagram; allowance (including the draft angle), etc. are marked out in the part of the dimension line; cast figure also apply sign marked parting surface. (3) It should also be marked on the casting Fig tolerance, hardness, does not allow casting defects and other technical requirements and test methods. Bollard, 150t bollard, Chen Hua Machinery (certified merchants) are provided by China Machinery Equipment Co., Ltd. Qingdao Chen. Qingdao Chen Hua Machinery Co., Ltd. (www.qdchenhua.com) CNC machine tools in this area devoted boundless enthusiasm and passion, Chen Hua machinery has been customer-centric, the concept of creating value for customers, quality, service to win market, and sincerely hope to cooperate with the community to create success, to create brilliant. Related businesses welcome inquiries, contact: Yuan Xi Chuan.