Core Tip: During die casting production, the mold is repeatedly subjected to the action of cold and heat stimulation, causing deformation and mutual tension between the formed surface and its interior, resulting in repeated cyclic thermal stress. This leads to damage to the organizational structure and loss of toughness, leading to the occurrence and continued expansion of microcracks. Once the crack expands, molten metal is squeezed in, and repeated mechanical stress accelerates the crack propagation. Therefore, on the one hand, the mold must be fully preheated at the beginning of die casting.

1.Thermal fatigue cracking damage failure

During die-casting production, the mold is repeatedly subjected to the action of cold and heat stimulation, causing deformation on the formed surface and its interior, which leads to repeated cyclic thermal stress. This leads to damage to the organizational structure and loss of toughness, leading to the occurrence and continued propagation of microcracks. Once the crack expands, molten metal is squeezed in, and repeated mechanical stress accelerates the crack propagation. Therefore, on the one hand, the mold must be fully preheated at the beginning of die casting. In addition, during the die-casting production process, the mold must be maintained within a certain operating temperature range to avoid early cracking and failure. At the same time, it is necessary to ensure that there are no internal issues before and during the production of the mold. In actual production, most mold failures are caused by thermal fatigue cracking.

2.Fragmentation failure

Under the action of injection force, cracks will initiate in the weakest part of the mold, especially when the marking marks or machining marks on the mold forming surface are not polished, or small cracks will first appear at the formed corners. When there are brittle phases or coarse grains at the grain boundaries, it is easy to fracture. When brittle fracture occurs, the crack propagation is rapid, which is a very dangerous factor for the fragmentation failure of the mold. For this reason, on the one hand, any scratches, machining marks, etc. on the mold surface must be polished, even if it is in the pouring system area, it must also be polished. In addition, it is required that the die materials used should have high strength, good plasticity, good impact toughness and fracture toughness.

3.Dissolution failure

The commonly used die-casting alloys include zinc alloy, aluminum alloy, magnesium alloy, and copper alloy, as well as pure aluminum die-casting. Zn, Al, and Mg are relatively active metal elements, which have good affinity with mold materials, especially Al which is easy to bite the mold. When the hardness of the mold is high, the corrosion resistance is good, while if there are soft spots on the formed surface, the corrosion resistance is unfavorable.

The qualification rate of parts processing plants is closely related to the quality of CNC precision mechanical parts processing. If the qualification rate of mechanical parts processing is too low, the competitiveness of the product can be imagined. So, the qualification rate is the lifeline for suppliers!

To improve the qualification rate, the design of mechanical parts processing must be correct. The design must start from reality, and the starting point of the design should be conducive to the processing and realization of parts by the parts processing factory, and cannot be separated from the actual machining of existing CNC precision mechanical parts. If the designed drawings are difficult to process and implement under existing conditions, they will also become waste products.

To improve the qualification rate, the process of machining mechanical parts must be reasonable. Properly arranging the processing procedures for CNC precision mechanical parts can not only improve the production efficiency of the parts processing plant, but also ensure the product qualification rate. Reasonably calculate the required materials for each workpiece to arrange each process step by step, so as not to make mistakes.

To improve the qualification rate, employees engaged in mechanical parts processing must have experience. CNC precision mechanical parts processing requires a lot of experience. Once the teacher obtains the processing drawings, they can analyze whether the drawing design is intact and accurate, and whether the surface accuracy, surface integrity, and process requirements of the parts can be achieved under the existing conditions of the parts processing factory. This skilled operating experience greatly ensures the qualification rate of products, which many new employees do not possess

To improve the qualification rate, attention should be paid to the details of spare parts processing. Select appropriate rotational speed feed rate and workpiece cutting amount to meet the requirements, accurately select tool angle, use various measuring tools accurately, and comply with strict CNC precision mechanical parts processing requirements If the employees of the parts processing factory can strive for excellence in every detail and meticulously perform every process, such a pass rate will definitely be guaranteed.

With the rapid advancement of the Internet of Things, big data, and intelligent technology, CNC precision mechanical parts processing technology is becoming increasingly perfect. New changes and opportunities are already in front of the precision machining industry. Who can take the lead? Countries all over the world are always paying attention to the latest development of CNC processing technology and preparing for intelligent applications, such as Germany's Industry 4.0, the United States' Industrial Internet, and Made in China 2025

As a concentration of application scenarios for intelligent CNC precision mechanical parts processing technology, precision machining enterprises cannot use intelligent technology to make traditional production more efficient, seize the critical opportunity period of industry change, and achieve leapfrog development of transformation and upgrading without the application of IoT (Internet of Things).

IOT (Internet of Things) in precision machining industry is an extension of Industrial Internet to our industry. In recent years, some manufacturers in Shenzhen have begun to use IoT (Internet of Things) technology to establish comprehensive support systems. Through intelligent cloud technology, each step of processing is connected to service centers, and services such as processing support, operation monitoring, and maintenance support are provided through IoT (Internet of Things).

It is reported that the intelligent cloud for CNC precision mechanical parts processing mainly provides equipment connection services for precision machining enterprises. Through the intelligent cloud, statistical data on the operation status and alarm occurrence of machine tools can be accessed at any time; Automatically backup the processing program and tool information used by the machining machine tool; SMS notification of machine tool alarm and processing completion information; Especially when a malfunction occurs, remote diagnosis is only performed.

IOT (Internet of Things) can be said to be the latest CNC processing technology. In areas where IOT (Internet of Things) does not cover, it may gradually start to lag behind this industry.

Price and quality should be highly positively correlated, as should precision mechanical parts processing services. In the field of CNC machining, it is impossible to have low prices and high-quality services, blindly seeking low prices, and only paying tuition fees in this market. Many of the clients we have received have found that we can only cooperate after suffering losses.

For example, Ms. Mu, who previously placed orders with other CNC processing manufacturers, only liked the low prices there, which would help their company control costs. However, after receiving precision mechanical parts processing products there, many problems were discovered. The accuracy did not meet the expected effect, and there were defects in the appearance treatment, which seriously affected the test results, resulting in repeated changes to the product plan.

Later, I heard from a friend that our company is a precision machining factory that has been engaged in precision mechanical parts processing for over 10 years, especially equipped with a five axis machine tool. Naturally, the processing accuracy is much higher than its peers. Ms. Mou contacted our business and directly sent out the processing drawings. After receiving the quotation, she placed the order without much bargaining. After receiving the product, testing was conducted and the accuracy reached the 0.05MM they wanted.