News

Recently, Dalian Jiachuang Metal Manufacturing Co., Ltd. (hereinafter referred to as "Jiachuang Metal") has achieved a major technological breakthrough in the field of sand casting. Its independently developed patent technology has successfully solved the manufacturing challenges of OH pump steel casting impellers. According to third-party testing, the comprehensive qualification rate of impellers has increased from the industry average of 85% to 99%, and the production cycle has been shortened by 40%. This achievement not only fills the technical gap in high-end pump castings in Northeast China but also marks the innovative strength of local small and medium-sized enterprises in industrial upgrading.

With the release of their 2025 semiannual reports, statistics compiled from 12 internationally renowned pump companies show that their total sales in the first half of 2025 reached approximately RMB 150.8 billion, a 19.2% year-on-year increase compared to RMB 126.46 billion in the same period last year. Of these 12 companies, only one achieved strong double-digit growth, while ten saw year-on-year increases.

Abstract: This paper systematically analyzes the causes, common processes and locations of sand hole defects in the sand casting process of BB3 type multistage pump bodies in cast steel parts, and proposes targeted solutions. Through literature review and case analysis, it was found that the defects of sand holes mainly result from insufficient strength of the molding sand, design flaws of the gating system and improper operation, and are prone to occur in the molding, core setting, closing and pouring processes. The specific locations include gates, risers, thick parts of castings and inner cavities. By optimizing the proportion of molding sand, improving the design of the gating system and strengthening process control, the occurrence rate of sand holes can be effectively reduced and the quality of castings can be improved.

With the release of their 2025 semiannual reports, statistics compiled from 12 internationally renowned pump companies show that their total sales in the first half of 2025 reached approximately RMB 150.8 billion, a 19.2% year-on-year increase compared to RMB 126.46 billion in the same period last year. Of these 12 companies, only one achieved strong double-digit growth, while ten saw year-on-year increases.

Recently, Dalian Jiachuang Metal Manufacturing Co., Ltd. (hereinafter "Jiachuang Metal") has made a critical breakthrough in sand casting of steel casting impellers—the core of OH pumps—via independently developed patents.

With the release of their 2025 semiannual reports, statistics compiled from 12 internationally renowned pump companies show that their total sales in the first half of 2025 reached approximately RMB 150.8 billion, a 19.2% year-on-year increase compared to RMB 126.46 billion in the same period last year. Of these 12 companies, only one achieved strong double-digit growth, while ten saw year-on-year increases.

The manufacturing of multi-stage pump bodies through casting is a systematic project that integrates materials science, mold engineering, thermal processing techniques, and quality inspection. The precision control of each link directly affects the operational performance and safety reliability of the pump set. With the continuous increase in the demand for multi-stage pumps with "high head, high efficiency, and long service life" in the industrial field, casting technology also needs to develop towards greater accuracy, higher efficiency, and more environmental friendliness - for instance, by optimizing the melting and casting parameters through numerical simulation technology to reduce trial-and-error costs; using 3D printing technology to manufacture complex sand cores to enhance the accuracy of the flow channels; and promoting low-energy consumption heat treatment processes to reduce energy consumption during the production process. Only by continuously promoting technological innovation and process upgrading can the quality level of cast multi-stage pump bodies be continuously improved, providing a solid guarantee for the stable operation in the field of fluid transportation.

Recently, Sulzer announced the launch of its new Scaba STA series of vertical mixers, specifically engineered for industrial mixing applications to deliver exceptional reliability and enhanced sustainability.

Dalian Jiachuang Metal Manufacturing Co., Ltd. Recently welcomed an important “old friend”: HERMETIC-Pumps Dalian Co. Ltd., our long-standing strategic partner.

In sand casting, shrinkage cavities and shrinkage porosity are the most common internal defects in castings. Shrinkage cavities typically manifest as irregular large cavities in thick areas or heat center zones of the casting, characterized by rough walls and dendritic crystals. Shrinkage porosity appears as fine dispersed pore clusters, predominantly occurring along casting axes or at thickness junctions. These defects severely compromise mechanical properties and airtightness, potentially leading to cracks and premature failure. As core processes in the casting workflow, mold design and core-making operations play a decisive role in preventing shrinkage porosity and cavities. This article systematically outlines effective measures to reduce their occurrence rates by focusing on critical aspects of mold-making procedures.