Home ProductsNewsContact Us
Home > News > How to Improve the Quality of Ductile Castings

How to Improve the Quality of Ductile Castings

Mar. 23, 2020

Ductile iron parts are the most widely used metal castings in more and more engineering finished products, machinery and equipment, and parts and accessories. However, there is a considerable gap in the performance, reliability, and service life of different quality ductile casting products. The same product, different quality, and product life cycle differ by several years. Therefore, we must face up to the quality problems of ductile casting products. We can strengthen production quality measures, improve the production technology of ductile castings, and innovate product quality. Find out the many factors that affect the quality of cast iron parts and develop more effective correction methods, so that we can get better casting products and the best results.

The quality of custom ductile iron grating includes product appearance quality, product intrinsic quality and product use quality. Appearance quality refers to the smoothness, roughness, and surface defects of castings, product size deviations, shape deviations, and weight deviations; the intrinsic quality of nodular casting products mainly refers to the chemical composition, mechanical properties, physical properties, and metallographic structure of the casting products. Rate, nodularity grade, nodular cast iron grade, and cracks, gaps, holes, inclusions, segregation, etc. existing inside nodular cast; the quality of product use refers to the life cycle of nodular cast products under different conditions: including wear resistance, resistance to Corrosion, acid and alkali resistance, cold resistance, heat resistance, fatigue resistance, shock absorption and other properties, as well as machinability, weldability, product durability, and reliability and other process performance.

Custom Ductile Iron Grating

Custom Ductile Iron Grating 

The factors that affect the quality of ductile casting products are as follows:

The first is the design of ductile castings. When designing ductile castings, a reasonable and optimal solution should be adopted. In addition to determining the casting geometry and size based on working conditions and metal material properties, the design must be considered from the perspective of casting alloys and casting process characteristics. Rationality, that is, obvious size effects and problems of solidification, shrinkage, and stress to avoid or reduce the occurrence of defects such as segregation, deformation, and cracking of cast iron parts.

The second is the casting process of nodular casting. That is, according to the characteristics and production conditions of the nodular casting casting alloy, the product structure, size and weight, the appropriate parting surface and shape, casting method are selected, and the casting molds, tools, feeders and pouring systems are properly set, so as to ensure the quality Ductile castings.

The third is the selection of the quality of nodular casting raw materials. The use of pig iron raw materials, nodularizers, furnace materials, refractory materials, fuels, fluxes, modifiers, casting sand, molding sand binders, coatings and other materials that meet the design requirements of substandard quality, will cause cast holes, pin holes, Defects such as slag inclusions and sticky sand affect the appearance and internal quality of cast iron parts, and in severe cases will cause castings to be scrapped.

The fourth is the operating ability of the casting process staff. It is necessary to formulate reasonable process operating procedures, improve the technical level of workers, and use correct procedures to ensure that the process regulations are correctly implemented. In terms of production quality management, training of production technicians should be strengthened to improve casting technology.
The fifth is the guarantee of quality management system: nodular castings are purchased from raw materials, smelted, product molding, processing, grinding, annealing and stress relief, and internal and external quality inspection, finished products storage, in each of these links, quality control Measures to ensure that products that do not meet the standards do not flow into the next production process, and products have corresponding quality records in each work process. Find problems in time and solve them. Find the problem and trace the source. Good quality management process is the guarantee of product quality.