Casting and Forging CNC Product Technology, New Product Information, New Technologies, Industry Trends, and China's Industrial Development

"Invisible Killers" in Casting: A Complete Analysis of Five Major Defects and Casting, a veteran metalworking process, holds a core position in mechanical manufacturing thanks to its low-cost and high-complexity molding capabilities. However, the casting process also harbors hidden challenges. Five common defects, like "invisible killers," can lead to increased costs and even production line disruptions. This article will analyze the causes, characteristics, and countermeasures of these defects, combining mainstream casting processes, and propose ultimate solutions.

Recently, the Chinese government, along with eight government departments, issued the "Implementation Plan for the Digital Transformation of the Machinery Industry (2025-2030)," aiming to promote the digital transformation and intelligent upgrading of the machinery industry. This initiative has far-reaching implications for the development of the machinery industry and the entire national economy. Background and Significance of the Plan As a fundamental and strategic industry, the machinery industry is characterized by its broad industrial coverage, diverse product range, complex structure, long industrial chain, and diverse production models. Accelerating its digital transformation is not only an inevitable requirement for the industry's own high-quality development, but also a vital force in supporting the digital transformation of all sectors of the national economy and promoting new industrialization. This implementation plan was developed to implement the "Action Plan for the Digital Transformation of Manufacturing."

Silica Sol process, also known as silica sol lost wax precision casting, is a kind of investment casting technology with silica sol as a binder. It is often used in the manufacture of precision parts of metal materials such as stainless steel, carbon steel, and alloy steel. Silica sol is a stable colloidal solution with nano-scale silica particles as the core and dispersed in water. Compared with the traditional water glass process, silica sol has higher thermal stability and better surface fineness, so it can produce higher quality castings.

Recently, the China Foundry Association issued the "Electron Microscope Analysis Method for Defect Detection of Cast Iron Parts", which will be implemented on October 21, 2025, and the implementation standard number is T/CFA 0198-2025.Next, let's take a look at what the electron microscope analysis method is. The electron microscope analysis method for defect detection of cast iron parts is a method of microscopic morphology observation, composition analysis and structural characterization of internal defects of cast iron parts by scanning electron microscope (SEM) or transmission electron microscope (TEM), which can effectively determine the defect type and guide the improvement of casting process.

As a common technology for metal material forming, casting achieves efficient manufacturing of complex components by injecting molten metal into the mold cavity and solidifying it. This technology integrates the principles of material solidification, fluid dynamics and thermodynamics, forming a complete scientific chain from microstructure control to macro process optimization. Based on the ASTM A802 casting quality standard and the ISO 8062 tolerance system, this paper systematically analyzes the technical characteristics and application boundaries of mainstream casting processes, and reveals the technical logic of its industrial evolution.

Casting tolerance: the art of balancing precision and cost In the manufacturing industry, casting is the core process of metal forming, and its tolerance control directly affects the dimensional accuracy, assembly performance and manufacturing cost of parts. Casting tolerance is not a simple stacking of numbers, but a systematic engineering that requires comprehensive consideration of process characteristics, material properties, size scale and economy. This article will systematically analyze the key points of casting tolerance from basic concepts to practical applications. I suddenly thought of this topic today because last year a British customer wrote the accuracy as ±0.1% when inquiring for a quote, and specifically told us that it was not ±0.01%. This detail made us feel that the customer's needs are the key to our correct work. Next, let's take a look at some standards for casting tolerances.

Metal castings can range in size from a few grams to several tones, shape complexity from simple to intricate and order size one-off to mass production.

​In the application field of metal materials, whether it is a foundry or a forging plant, the performance of metal materials is directly related to the quality, safety and service life of the products. Among them, the impact test of metal materials plays an indispensable role as an important means to evaluate the performance of materials under sudden impact loads.

Coated sand casting in the foundry field has a long history, casting production is also quite large; Shandong Province is currently China's casting film sand manufacturers are more concentrated areas, Sinostar MACH professional film sand casting parts has been more than 15 years of history, the basic technology has been very mature, the current use of film sand casting production of precision steel castings face a number of problems that need to be solved, such as sand sticking (scars), cold barriers, porosity, etc., how to solve these problems remain to be our further exploration and Solve these problems.

Casting and forging are common metal processing methods used to manufacture a wide variety of metal parts. However, the defects may occur during casting and forging processes, such as porosity, slag entrapment and cracks, which may......