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Heavy Section Ductile Iron Process Improvement and Application


Members discussed a careful analysis, decided to craft the right thickness of most of the upward process planning programs, while setting out by computer simulation of AutoCAD, the aided process design and operation of specific process elements of the following measures: ① smelting: the use of 30t and 40t EAF Ladle refining combined method of high quality scrap steel,[link widoczny dla zalogowanych], to ensure that the chemical composition of molten steel and non-metallic inclusions comply with the requirements; ② group of core technology solutions used, and carefully prepared process, and the actual loft with CAD to ensure the reliability of process feasibility; ③ requirements wooden mold surface is smooth,[link widoczny dla zalogowanych], firm structure,[link widoczny dla zalogowanych], size, accuracy; wooden mold to make all the rounded corners, and make plant identification target words, the number of words cast sequence number; ④ style paved the sand bed, sand bed put some slag and other loose material, and the airway leads to the pit, the same time laying in the sand bed a good hook to No. 1 core from the bottom lock; ⑤ No. A core of bone require the core pipe production, shot on the hole in the wall, wrap rope to facilitate the outlet, and No. 1 core and the sand bed airway phase through airway, it locked in the sand bed and prevent drift cell; ⑥ No. 2 good to be placed outside the inner core of cold iron, cold iron outside No. 2 core core skeleton welded together to prevent loss of cold iron; all the cores need to be affixed to the surface of 40 ~ 60mm thick, chrome ore, to ensure the quality of the casting surface; ⑦ not use the cold iron castings; outer surface of the cold iron to be removed rust, oil, polished smooth, uniform laying along the circumference; sand on the reign to make, month and casting sequence number to be well documented; (Continued from page 80) mechanical properties: single-cast test bars crb is 505-580MPa. 6 to 7-7.5%; with crb test bars cast as the 450-460MPa. Effects of globalization and microstructure analysis: fixed template: Single cast test bars: the ball of an organization 90% of ferrite, pearlite 10%; bulk microstructure of the second ball of the ball diameter of 3 - 8mm,[link widoczny dla zalogowanych], matrix is ferrite. Dynamic Template: Single cast test bars: ball of the second, the organization is 20% pearlite, ferrite is 70-80%. Ontology is a ball of microstructure, the ball diameter is 5-8ram, the matrix is ferrite. ⑧ requirements modeling to ensure that the compaction of sand and dried, to avoid out of sand, gravel, holes and other defects. After a good core group, the entire cavity surface drying paint brush twice zircon powder to ensure the quality of castings; ⑨ pouring package of 60 eyes. Gating system is set to sprue dP90 × 2, 90 runner, the runner three distributions, each 90 × 6. The runner should be cut to enter the upper and lower runner to be staggered; ⑩ riser height of pouring molten steel rose 1 / 2 above, change to full poured into the riser, and cover a good insulation agent. To strengthen the effect of riser feeding, followed by a furnace in the ZG230-450 of the steel furnace, every 1 to 1.5 hours a complement Riser. At the same time, to cast two test blocks of Kiel, with the pieces of the heat treatment; ⑩ sure hit me holding the casting time to heat riser cutting, casting to heat repair; casting repair welding repair welding techniques to perform a special, warm-up welding; ⑥ casting heat treatment according to process requirements, together with the test bars are heat treatment furnace, good curve and the corresponding heat treatment records, the inspectors the good quality of the production process, good size records for future reference. After everyone's hard work, the pieces of a successful production. Chemical composition, gas content and elements of non-metallic inclusions to fully meet the technical requirements, mechanical properties and non-destructive flaw detection requirements are all met. In particular, the surface quality and dimensional accuracy have been highly praised by users, the user pressure test and found no leakage. These show that: I already have the ability to produce such castings, and made some empirical data, in particular, surface accuracy, detection level, pressure test and a series of technical indicators related to the acquisition of data, that our technology has been to a new level. Meanwhile, the successful production of parts, but also exercise our technical team, as we further develop domestic market, has laid a good foundation. Pallet: Single cast test bars: ball of the second, the ball diameter is 5-8ram, the matrix ferrite is 95%, 5% pearlite. Body for the second ball of the microstructure,[link widoczny dla zalogowanych], the ball diameter 3-8mm, the matrix is ferrite + pearlite. The above indicators all meet the technical requirements. Taking these results and user feedback, and we take these through a series of measures, from the fundamental solution to the heavy section ductile iron ball of the recession and the weakness of life. Good for my company to create a wide range of economic and social benefits, while ductile iron instead of the scientific ideas of ordinary carbon steel onto a new level.

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