When discussing the original process design of nodular iron castings, it is considered that there is a large hot spot here, and the product feeding is not easy. Instead of using an ordinary riser, 80/110 heating riser sleeve is used for feeding, so that the feeding volume of the...
Internal shrinkage porosity and shrinkage cavity defects of nodular iron castings are common problems in the casting industry, and how to solve them is also a major problem in the casting industry, especially for castings with high requirements for product compactness, it is more difficult to achieve perfection, and...
Through the comprehensive analysis and judgment of the defects after the actual production of nodular iron castings and the CAE simulation results, the meat shortage problem of nodular iron castings is mainly caused by the excessive concentration and uneven distribution of the internal sprue in the gating system during...
The original process scheme of nodular cast iron is shown in Figure 1, with two pieces in one box. It flows from the two feet of the motor base, adopts an open gating system and two internal sprues. However, the nodular iron castings produced by this scheme have many...
Austenite and graphite will precipitate in the solidification process of nodular iron casting. The crystallization of austenite will cause shrinkage, while the crystallization of graphite will cause expansion, that is, expansion will occur in addition to shrinkage in the solidification process, which makes the solidification process of nodular iron...
In the solidification process of Hypereutectic nodular iron casting, when the temperature is lower than the graphite liquidus, the primary graphite ball will precipitate. In the growth process of primary graphite ball, due to the direct contact between graphite and molten iron, the diffusion of carbon atoms is much...
The nodular iron castings base plays the role of supporting and fixing the stator core in the motor. In the bearing end cover structure, the coordination between the base and the end cover plays the role of supporting the rotor and protecting the motor winding. There are many structural...
From the solidification volume change model of nodular iron castings, we can get the following measures to guide the process design of nodular iron castings. 1.Pay attention to the smelting quality of molten iron Selecting the appropriate carbon equivalent, generally 4.3 to 4.4 is more appropriate, and moderately increasing...
For the simulation of nodular iron castings, the following simulation test is carried out by taking the actual nodular iron castings produced by ZHY Casting as an example. The quality of this nodular iron castings requires that the casting surface is smooth, and the nodular iron castings are not...
The formation of shrinkage porosity is due to the wide crystallization temperature range of the alloy, which tends to paste solidification mode. It is not solidified at the end. Due to poor feeding and unsmooth channel, shrinkage porosity defects may be formed. There has never been a very effective...