2021-09-22

Causes of Shrinkage Cavities in Precision Casting and Preventive Measures

Cause of formation: The fundamental cause of shrinkage cavities is that, during liquid contraction and solidification, a particular region of the casting—typically the last-to-solidify hot spot—fails to receive timely feeding from the molten metal, resulting in the formation of a shrinkage cavity at that location.

2021-09-22

The Significant Importance of Stainless Steel Precision Casting

Stainless steel casting is a technology within the foundry industry, yet it differs from traditional casting due to the high value-added nature of precision-cast products. According to relevant statistics, in Europe and North America, precision-cast components account for nearly 70% of the total value added in aerospace equipment and aircraft engines, whereas in China this share remains below 35%.

2021-09-22

Introduction to Precision Casting Processes

Precision casting may be somewhat unfamiliar to those who are not well-versed in casting, but it is a familiar process for precision-casting manufacturers, as this is precisely what they specialize in. So, what should we pay attention to during the casting process? In the following, I will outline the methods for determining holding pressure, filling time, and mold-opening timing in precision casting, hoping that these guidelines will be helpful to users who wish to learn more about this process.

2021-09-22

What is the role of silica sol casting in precision foundries?

The three silicon sol casting methods differ in the materials used to fabricate the wax patterns and the shell molds. In the silicon sol process, low-temperature and medium-temperature waxes are employed to produce the wax patterns, followed by the formation of the shell mold using mismatched sand, mullite sand, mismatched powder, and silicon sol. Depending on the specific requirements of each product, 4 to 8 shell layers may be applied. In the sodium silicate process, low-temperature wax is used for the wax pattern, and the shell mold is then formed using sodium hydroxide, quartz sand, and other materials. The composite process combines elements of the first two: the initial two to three layers are made with silicon sol, while the final two layers utilize sodium silicate.

2019-01-19

Differences between Gray Iron Casting and Ductile Iron Casting

In gray iron, the graphite is flake-shaped; in ductile iron, it is spheroidal. When ductile iron is struck, if the sound resembles that of carbon steel, it indicates good spheroidization. In contrast, gray iron produces a dull, muffled sound when struck.

2020-07-08

What should foundries pay attention to during manufacturing?

Over 32 years in the industry, we have achieved precise control over casting technologies and machining processes through continuous innovation.

2020-07-08

What are the advantages of gray iron castings, and what are the acceptance criteria?

Gray iron castings are produced using the lost-foam casting process and resin-bonded sand molding, equipped with large gas-fired tempering furnaces, artificial aging, and quenching-and-tempering to relieve internal stresses, thereby enhancing the dimensional accuracy of the finished castings. During the finish machining of the machine bed, prolonged cutting operations cause the spindle to heat up, leading to thermal deformation that adversely affects the final machining accuracy. For high-precision and large-scale machine tools, machining errors caused by thermal deformation account for approximately 40% to 70%. Since thermal deformation can only be mitigated but not completely eliminated, under fixed machine tool conditions, the primary approach is to control the cutting parameters in order to stabilize the machine tool’s temperature and thus prevent temperature fluctuations from impacting machining accuracy. The main measures for controlling temperature variations during bed machining include: 1) Prior to finish machining, the machine tool must undergo a period of no-load running; only after the temperature rise has stabilized and the entire machine tool system has reached thermal equilibrium, with all components maintaining relatively stable positions, can finish machining commence. 2) After semi-finish machining, due to the substantial cutting parameters and significant temperature rise, direct finish machining should not be performed; instead, the machine tool should be run at no load for a period of time before proceeding with finish machining. 3) During multiple passes in the finish machining process, to ensure consistent temperature rise, the cutting parameters must remain essentially constant. (1) High compressive strength and tensile strength. (2) Excellent dimensional stability. (3) High modulus of elasticity. (4) Good wear resistance. (5) Good vibration damping properties. (6) Good machinability. (7) Good castability. (8) High dimensional accuracy and low surface roughness. After pouring, large gray iron castings must undergo acceptance inspection according to the following standards: 1. Chemical composition standards for the casting; 2. Mechanical property standards, including tensile strength and hardness; 3. Metallographic standards, covering carbide content, pearlite content, graphite length, etc.; 4. Dimensional requirements for the casting; 5. Performance requirements, such as pressure testing and leak detection.

2020-07-08

Our company’s quality management is fully conducted in accordance with the ISO 9001 system.

The Dayaowan Port in the Development Zone is just 30 kilometers away, offering extremely convenient transportation, and the company’s registered capital is RMB 1 million.

2020-07-08

Design and develop various castings according to customer requirements.

Dalian Xinmiao Casting Industry Co., Ltd. is located in the eastern part of Jinzhou District, Dalian City, on the coast of the Yellow Sea, 50 kilometers from Dalian Airport, 30 kilometers from the Shen-Da Expressway exit, with the Dan-Da Expressway running through it, 51 kilometers from Dalian Port, and 30 kilometers from Dayaowan Port in the Development Zone, enjoying extremely convenient transportation. The company has a registered capital of RMB 1 million and is a comprehensive manufacturing enterprise integrating casting, machining, and product packaging, equipped with modern production facilities and strong technical expertise.

2020-07-08

Xinmiao is committed to partnering with you to become your preferred supplier!

Dalian Xinmiao Casting Industry Co., Ltd. is located in the eastern part of Jinzhou District, Dalian City, along the Yellow Sea coast, 50 kilometers from Dalian Airport, 30 kilometers from the Shen-Da Expressway exit, with the Dan-Da Expressway running through the area, 51 kilometers from Dalian Port, and 30 kilometers from the Dayao Bay Port in the Development Zone, enjoying extremely convenient transportation. The company has a registered capital of RMB 1 million and is a comprehensive manufacturing enterprise integrating casting, machining, and product packaging, equipped with modern production facilities and strong technical capabilities. It offers a full range of products with novel designs, superior quality, and competitive prices, with an annual production capacity of over 2,000 tons. Its main products include various ductile iron and gray cast iron pipe fittings and pipe joints conforming to ISO 2531, EN 1092-1, DIN 2501, BS EN 545, EN 598, AWWA C110/C153, and PVC series standards, as well as various valve bodies, manhole covers for water, electricity, and gas applications, and custom-designed and developed castings based on customer requirements.