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 Posted: Wed 12:05, 19 Jan 2011 Post subject: ugg italia White cast iron pieces to prevent the c |
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White cast iron pieces to prevent the crack process measures
Principled distinction between those. High pouring temperature, mold and core, high stiffness, high volatile casting, cast iron and casting of low carbon equivalent is a rough early-type crack open the incentive. High pouring temperature, mold and core stiffness is low, high and volatile cast iron with low carbon equivalent is the incentive for small cracks. 3 to prevent the crack to prevent cracking of crude process measures can be taken to the following: (1) modify the casting structure, an appropriate increase wall thickness, to avoid cross mutation. (2) a lower casting temperature. (3) Avoid excessive use of rigid mold and core. Such as dry sand, water glass sand,[link widoczny dla zalogowanych], and from the hard sand. Using the mold of low hardness, low clay content and yield of good casting and core. (4) to reduce the fuel consumption of oil sands and oil sand core of the baking time to cast no hole, core strength to meet the process requirements shall prevail. (5) sand with high volatile matter and reduce the heat and thermal storage capacity of the mold. Therefore, coal consumption should be controlled wet sand in the lower limit. (6) cast iron should be as high as possible number of carbon equivalent, preferably higher than the Defects and Countermeasures 2DEFECT & C0UNTERMEASURE Article ID: l003-8345 (2005) 02-0045-02 centrifugal casting of iron-based method Huobai defects tinkering Zhen, Wu Yue, Wang Rongjun, Wu Jing (BZ T-way ship machinery Co., Ltd., Huludao 125005) MeltingRepairingaIronMouldforCentrifugalCastingHUOBo-zhen, WUYue, WANGRong-jHn, WUJingfBohaiMarineMachineryEngineeringCo. Ltd. Huludao125005China) I produced a set of large copper-type centrifugal casting of iron, its size and structure shown in Figure 1,[link widoczny dla zalogowanych], material HT200, maximum wall thickness of 170mm, the quality of 4000kg. The type of iron in the casting process, due to lack of liquid metal, causing at least not pouring, cleaning and found the long locally 70minx300minx1000mm lack of meat, and the two guides are not cast out. To save the casting, to avoid economic losses, and fill method using high temperature melting and low temperature annealing process, the lack of meat parts to repair castings. After the casting of good quality repair and found no cold shut, slag and other defects in the machining process does not have to knife phenomenon, to meet the design requirements: a process analysis of iron-type centrifuge is used to produce copper company Apply the special tooling, working conditions were: speed 850r/min, casting quality Received: 2004 About a l2-3O: Huobo shock (1976.11 A), male, graduated from the Wuhan Institute of Shipbuilding Technology School, technicians,[link widoczny dla zalogowanych], mainly engaged in the casting process of the preparation and design work, contact telephone: l3O5O996O58. 4,;-i-a _, c3.0%. (7) is not completely solidified castings, may not be based off the sand: fine cracks can be taken to prevent the following process steps: (1) maintain a lower casting temperature. (2) crack in the core parts of the mold or coated with special paint rinse, such as tellurium coating. (3) the cracks of the metal parts to provide adequate feeding (feeding riser),[link widoczny dla zalogowanych], and to promote solidification. (4) increase the stiffness mold, wet hardness of not less than 80. Avoid the use of high moisture and low sand content of clay, the rational use of dry sand, water glass sand, and from the hard sand. 900kg. Requirements of iron-type itself has no casting defects. Especially the two track surface shall not affect the rotation of the slag, gas larvae L, cracks and other defects, resulting in the casting process in order to avoid radial and iron-based off-line phenomenon due to poor performance of welding cast iron, if used welding complement, one welding area is too large, not easy to operate; the other hand, the transition zone in the welding is often difficult}} {iron carbide processing organization, making iron-based processing produced significant in the welding area to knife phenomenon, iron conditions in the high-speed rotation type is difficult to maintain a balance, great danger. For these reasons we decided to adopt after repeated melting and fill method of repair. This process is the full use of liquid metal '_-q-,[link widoczny dla zalogowanych], (5) baking and curing a reasonable question, Paul Wang core has a high rigidity. (6) to reduce the volatile sand, wet sand by adding the amount of coal should be reduced to a minimum volume. (7) to maximize the cast iron of carbon equivalent, preferably higher than 3.0%: ( changes in casting structure, eliminate or reduce hot section. (9) The use of cold iron, improve casting surface of the relevant parts of the cooling rate. Steps 4 and 5 with the rough crack prevention measures on the contrary, if the proposal on the crack types are suspected to be the first test for the process, after the file into the Arts
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