As the cornerstone of industrial manufacturing, the foundry industry has long faced a number of deep-rooted challenges. Among them, high scrap rates are a \"hidden cost\" that not only means direct waste of raw materials, but also leads to long product development cycles, high rework costs, and the loss of valuable market opportunities. For some complex structure, high technical requirements of the castings, the yield of the traditional process will drop dramatically. This predicament has prompted the industry to urgently seek a technological change that addresses the root causes of the problem. In this context, additive manufacturing (commonly known as 3D printing) with its unique advantages for the traditional casting industry to provide a subversive whole chain digital solutions for the transformation and upgrading of the industry provides a new path.<\/p>\n\n\n\n
Casting defects are the direct cause of high scrap rates. These defects are not accidental, but are dictated by the physical and process limitations inherent in conventional casting processes.<\/p>\n\n\n\n
firstlystoma<\/strong>together withshrinkage<\/strong>. Porosity mainly originates from the involvement or inability to effectively discharge gases (e.g. hydrogen, mold outgassing) in the liquid metal during the pouring and solidification process. When the dissolved gases in the liquid metal are released due to reduced solubility during cooling and solidification, bubbles will form inside or on the surface of the casting if they are not discharged in time. Related to this is shrinkage, which is a natural phenomenon of volume contraction of the metal during solidification. If the cooling system is not properly designed, resulting in local mold temperature is too high, or insufficient complementary shrinkage, it will form internal voids or depressions, the so-called shrinkage holes.<\/p>\n\n\n\n Next.sandwiched<\/strong>together witherror type (math.)<\/strong>. In conventional sand casting, sand molds and sand cores usually need to be assembled and bonded after being made from multiple pieces separately. In this process, any tiny rupture of the sand core or improper bonding may lead to sand particles being caught in the metal liquid, forming sand entrapment defects. In addition, if the mold parting surface or the sand core is not positioned accurately, it may also lead to the casting of the upper and lower parts of the misalignment of the mis-shape defects.<\/p>\n\n\n\n endcold storage<\/strong>together withcrackles<\/strong>. When the fluidity of the metal liquid is poor, the pouring temperature is too low, or the runner design is narrow, the two metal streams are solidified without being fully integrated at the leading edge, leaving a weakly connected cold segregation. And during cooling and solidification, if there are uneven stresses within the casting, thermal cracks may occur during shrinkage.<\/p>\n\n\n\n Another core pain point of the traditional casting process is its mold manufacturing process. Traditional wood or metal core box manufacturing is a labor-intensive, highly skilled worker-dependent process with long lead times and significant costs. Any minor design change means that the mold needs to be rebuilt, resulting in high additional costs and weeks or even months of waiting time.<\/p>\n\n\n\n This over-reliance on physical molds also fundamentally limits the design freedom of castings. Traditional mold-making processes are unable to mold complex internal runners and hollow structures in one piece, which must be disassembled into multiple independent sand cores and then assembled by complex tooling and labor. 2<\/sup>. This process limitation forces designers to compromise and sacrifice part performance for manufacturability, such as simplifying cooling channels to accommodate drilling processes that do not allow for optimal cooling.<\/p>\n\n\n\n To summarize, the high scrap rate of traditional casting is not an isolated technical problem, but a product of its core processes. The traditional \"physical trial and error\" mode makes the foundry in the discovery of defects, need to go through a long process of mold modification and retesting, which is a high-risk, inefficient cycle. 3D printing's revolutionary value is that it provides a \"moldless\" solution, fundamentally reshaping the entire production process, will be the traditional \"physical trial and error\" mode, will be the traditional \"physical trial and error\" mode, will be the traditional \"physical trial and error\" mode, will be the traditional \"casting\" high scrap rate is not an isolated technical problem, but its core process products. The revolutionary value of 3D printing is that it provides a \"moldless\" solution that fundamentally reshapes the entire production process, transforming the traditional \"physical trial-and-error\" model into a \"digital simulation validation\" that puts the risk in front of the process, thus eliminating most of the causes of scrap at the source.<\/p>\n\n\n\n The core advantage of 3D printing is its \"moldless\" production method, which allows it to bypass all of the mold-related challenges inherent in traditional casting, thus radically reducing scrap rates.<\/p>\n\n\n\n Directly from CAD to sand mold.<\/strong> Binder Jetting in Additive Manufacturing is the key to making this happen. It works by precisely spraying liquid binder onto thin layers of powder (e.g. silica sand, ceramic sand) from an industrial-grade printhead based on a 3D CAD digital model. By bonding layer by layer, the 3D model in the digital file is constructed in the form of a solid sand mold or sand core. This process completely eliminates the need to rely on physical molds. Because there is no need for lengthy mold design and manufacturing, the mold-making cycle can be shortened from weeks or even months to hours or days, enabling \"print-on-demand\" and rapid response to design changes, dramatically reducing up-front investment and trial-and-error costs.<\/p>\n\n\n\n One-piece molding and complex structures.<\/strong> 3D printing's layered manufacturing approach gives unprecedented design freedom. It is able to mold complex sand cores that would traditionally have to be split into multiple parts, such as the meandering runners inside an engine, into a single monolithic piece. Not only does this simplify the casting process, but more importantly, it completely eliminates the need for core assembly, bonding and misalignment, thus eradicating common defects such as sand entrapment, dimensional deviations, and misshaping caused by such issues.<\/p>\n\n\n\n The value of 3D printing goes beyond \"moldlessness\" itself. It elevates the manufacturing process to a whole new digital dimension, allowing data to be verified and optimized before physical manufacturing, turning \"after the fact\" into \"before the fact\".<\/p>\n\n\n\n Digital Simulation and Design.<\/strong> During the digital design phase prior to 3D printing, engineers can use advanced Finite Element Analysis (FEM) software to perform accurate virtual simulations of the pouring, make-up shrinkage and cooling processes. This makes it possible to anticipate and correct potential defects that could lead to porosity, shrinkage or cracks before actual production. For example, by simulating the flow of the liquid metal in the runners, the design of the pouring system can be optimized to ensure smooth filling and effective venting. This digital foresight greatly improves the success rate of the first trial run and guarantees casting yields at the source.<\/p>\n\n\n\n Excellent sand properties.<\/strong> 3D printed sand molds, due to their layer-by-layer construction, can achieve uniform densities and air permeability that are difficult to achieve with traditional processes. This is crucial for the casting process. Uniform gas permeability ensures that gases generated inside the sand mold can escape smoothly during the pouring process, significantly reducing porosity defects caused by poor venting.<\/p>\n\n\n\n Cooling with shape.<\/strong> Conformal cooling technology is another revolutionary application of 3D printing in the field of casting molds. Mold inserts manufactured through metal 3D printing have cooling runners that can be designed to exactly mimic the surface contours of the casting. This achieves fast, uniform cooling, significantly reducing deformation and shrinkage due to uneven shrinkage, thus dramatically reducing the scrap rate. According to data, molds with follow-through cooling can reduce injection cycle times by as much as 70%, while significantly improving product quality.<\/p>\n\n\n\n From \"physical trial and error\" to \"digital foresight\".<\/strong> The core contribution of 3D printing is to transform the traditional foundry model of \"trial and error\" into \"anticipatory manufacturing\". It enables foundries to perform numerous iterations in a digital environment in a cost-effective manner, which is a fundamental shift in mindset and business process. This \"hybrid manufacturing\" model makes 3D printing easier to adopt by traditional foundries and enables the most efficient production. For example, 3D printing can be used to create the most complex and error-prone sand cores, and then combined with sand molds made using traditional methods to \"build on the strengths\".<\/p>\n\n\n\n As a pioneer and leader in the field of additive manufacturing in China, 3DPTEK provides strong \"hard power\" support for the foundry industry with its self-developed core equipment.<\/p>\n\n\n\n The company's core product lines are3DP Sand Printer<\/strong>that highlights its leadership in technology. Flagship devices3DPTEK-J4000<\/a>With an extra-large molding size of 4,000 x 2,000 x 1,000 mm, it is highly competitive on a global scale. This extra-large size allows large, complex castings to be molded in one piece without the need for splicing, further eliminating potential defects caused by splicing. At the same time, for example<\/p>\n\n\n\n1.2 The traditional mold manufacturing \"high cost\" and \"low efficiency\" dilemma<\/h3>\n\n\n\n
Chapter 2: 3D Printing: A Revolutionary Breakthrough from Technology to Solution<\/h2>\n\n\n\n
2.1 Moldless production: eliminating the root causes of obsolescence<\/h3>\n\n\n\n
2.2 Optimization process: data to guarantee casting quality<\/h3>\n\n\n\n
Chapter 3: SANTI TECHNOLOGY: A Digital Engine to Empower the Foundry Industry<\/h2>\n\n\n\n
3.1 Core equipment: \"hard power\" for casting innovation<\/h3>\n\n\n\n