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What are the advantages of CNC machining of radiator parts?

For friends who have been in contact with the radiator component industry, they often see or hear "CNC machining", but too much exposure does not necessarily mean that many people understand. In fact, many questions are still about CNC machining. What are the advantages? Let's take a closer look. CNC machining is an index-controlled machine tool machining, which is a method of using digital information to control the machining process. Traditional mechanical processing is done manually by machine tools. During processing, the mechanical cutter is shaken to cut metal, and the accuracy is measured with calipers and other tools. However, traditional artificial intelligence processing is far from being able to meet the needs of production development. Therefore, the emergence of CNC machining provides the possibility for the standardization, precision and efficiency of mechanical product processing. The CNC machining process in the radiator component industry also shines. The

Investment Casting Materials and Manufacturing Process

Mold material The performance of the molding material should not only ensure the convenient production of investment molds with accurate dimensions and high surface finish, good strength and light weight, but also create conditions for the manufacture of mold shells and good castings. Molding materials are generally formulated with waxes, natural resins and plastics (synthetic resins). All mold materials mainly prepared with wax materials are called wax-based mold materials, and their melting point is low, 60~70 ° C; all mold materials mainly prepared with natural resins are called resin-based mold materials, with a slightly higher melting point, about 70 °C. ~120℃. invest-casting.com   Precision Investment Castings China prototype company service include :  High Quality Investment Casting Parts Custom , Lost Wax Investment Casting Sand Casting , Lost Foam Casting , Gravity Casting , Die Casting , Graphite Casting , Casting Moldsmanufacturers . Manufacture of Folding Investments In t

알루미늄 합금 다이캐스팅의 단점을 해결하는 것이 편리합니다!

알루미늄 합금 다이캐스팅은 현재 현재의 전자제품 , 자동차 , 생활필수품 등 많은 산업과 분야에서 널리 사용되고 있습니다 . 그러나 알루미늄 합금 다이캐스팅에서 자주 발생하는 몇 가지 결함 및 해결 방법은 다음과 같습니다 .   알루미늄 합금 다이캐스팅   1. 불순물   알루미늄 합금 다이 캐스팅의 불순물 문제는 주로 특정 온도에서 알루미늄 , 규소 및 다량의 철 , 망간 , 크롬 및 기타 화합물을 포함하는 결정립과 일부 산화물로 구성됩니다 .   해결책 : 알루미늄 잉곳의 조성을 엄격하게 제어하고 , 제련로의 난로를 정기적으로 청소하고 , 정기적으로 슬래그를 처리하면 문제를 해결할 수 있습니다 .   2. 구강 문제   다공성은 다이캐스팅 부품의 내부 또는 표면에 나타나는 다양한 크기의 구멍을 말하며 , 이는 다이캐스팅 부품의 경도 부족으로 이어져 표면의 외관에 영향을 줍니다 .   Solution: 적절한 정제제를 사용하여 모공을 처리하고 , 공정을 조정하고 , 저속을 적절하게 줄이고 , 이형제가 너무 많이 분사되어 모공 문제가 해결되지 않는지 확인하십시오 .   3. 균열 문제   균열은 알루미늄 합금 다이캐스팅의 매트릭스가 파괴되고 , 외력의 작용에 따라 확장되는 경향이 있는 선형 또는 기타 라인인 기다란 틈이 형성되는 것을 의미합니다 .   솔루션 : 합금 조성을 올바르게 제어하고 , 냉각수 회로를 늘리고 , 알루미늄 합금 다이캐스팅의 구조를 변경하고 , 사출 위치를 변경하거나 증가시키면 해결할 수 있습니다 . PINJIN 서비스에는 다음이 포함됩니다 . 알루미늄 다이캐스팅 , 아연 다이캐스팅 , 마그네슘 다이캐스팅 , 투자 주조 , 모

Test method for surface cleanliness

<p> Cleanliness testing</p> <p> Cleanliness measurement methods are very important for process control, quality assurance, and failure analysis. They are generally used to obtain cleanliness data about measurement subjects such as various mechanical equipment, electronic parts, etc. Detailed process. </p> <p> There are requirements for sampling when testing cleanliness. The basic requirements for sampling are determined by the number of samples and the sampling location. The larger the volume of the part, the larger the surface area, and the lower cleanliness, the number of samples will decrease accordingly. Parts should be randomly selected from the production, and no contamination of the parts should be caused during the sampling process and the subsequent inspection process. </p> <p> Typical types of pollutants</p> <p> When testing cleanliness, firstly, the environment should be clean, and the cleanliness should be compatible with the requirements of the test; secondly, the clothes and hands of the test personnel should be clean; Third, the utensils used must also be clean. Cleanliness measurement methods</p> <p> There are many cleanliness measurement methods, divided into two categories: oil pollution and particulate pollution. The main types are as follows: </p> <p> * Visual inspection method </p> <p> The visual inspection method is to manually inspect the outer surface or the inner cavity surface of the part that can be seen directly under the microscope with the eyes. Adjust the illumination brightness and magnification of the microscope, artificially can judge whether the pollution particles are metal, non-metal, or fiber and size. The visual inspection method can check the relatively large and obvious particles, spots, rust spots and other pollution remaining on the surface of the parts, but the result of the inspection has a lot to do with human factors. </p> <p> * Contact angle method (also called water drop angle method)-measuring grease pollutants</p> <p> The so-called contact angle is the thermodynamic equilibrium held by the liquid on the solid surface Horn. The measurement of the contact angle formed between a solid and a liquid is an analysis technique that is widely known in many similar fields such as surface treatment and polymer surface analysis. It is a surface analysis technique that is very sensitive to changes in a single layer of multiple units. The contact angle of the liquid drop on the solid surface is measured to evaluate the wettability of the surface. If the droplet can wet the surface, the contact angle is small. On the contrary, if the droplet cannot wet the surface, and beads or bubbles tend to form on the surface, the contact angle is large. This is the principle of the “water film residue” test. A large contact angle indicates that the surface is contaminated by hydrophobic dirt (oil/grease, etc.). On the contrary, a small contact angle and droplets are broken or thinned, indicating that the surface is clean. This test method is also greatly affected by the material of the substrate, the roughness of the substrate and human factors, and this method is not easy to identify very light or scattered dirt. Especially some special materials (such as PTFE plastic) have a large contact angle to most liquids even if the surface is very clean. Therefore, the contact angle method is not suitable for testing certain substrates or critically important surface cleanliness. </p> <p> * Fluorescence luminescence method-measuring grease pollutants </p> <p> In many cases, ultraviolet light can be used to detect the cleanliness of the surface of the part. Under the irradiation of ultraviolet light, the pollutant particles on the surface will fluoresce. Because the energy of ultraviolet rays is absorbed by the dirt, the electrons of the dirt particles are excited and jump to the high-level electron layer. The unstable electrons at the high-energy level will then return to the original low-level electron layer. In the process, the original absorbed energy is It is released in the form of heat and light-fluorescence. The frequency of this activation release is thousands of times per second, so the fluorescence under ultraviolet light is not flickering but continuous and stable. According to the fluorescence, the position of the dirt on the surface of the part can be visually detected. The fluorescence intensity can also be used with signal detection equipment. The measurement thus indicates the degree of contamination of the surface. But if you want to identify the composition and other characteristics of the pollutants, you must rely on other analysis methods. The German SITA Surface Cleanliness Meter adopts the principle of fluorescence excitation method and can be used to detect grease and oil pollutants on the surface of parts</p> <p> * Particle size quantitative method-particle pollutants measurement</p> <p> This It is a new method for determining the cleanliness of parts. The basic principle is that the surface to be detected and the pollutant particles have different light absorption or scattering rates. The test method is to clean a certain number of parts under certain conditions, fully filter the filter membrane through which the cleaning solution passes, and collect the dirt on the surface of the filter membrane, then dry the filter membrane with a microscope (the best equipment is with Image recognition and analysis equipment with shooting function) is detected under light irradiation, and the dirt particles are counted according to the particle size and quantity, and the result of solid particle contamination of the measured object parts can be obtained. This is a cleanliness detection method suitable for quantification of precision cleaning, especially for detecting tiny particles and colored impurity particles. But if the filter membrane is white, the recognition of white dirt and bubbles may cause misjudgment. </p> <p> Limit value of particle size quantity method: For parts of specific specifications, when a certain number of samples, inspection frequency, cleaning medium, cleaning parameters and operation process are specified, the particles are counted according to size, and each size The ranges respectively stipulate the maximum allowable number of particles. As long as one item exceeds the standard, the test conclusion is unqualified. </p> <p> * Gravimetric method-measuring particulate pollutants </p> <p> Gravimetric method is the most commonly used cleanliness determination method in industrial production and testing. The measurement principle is to clean a certain number of samples under certain conditions, and then fully filter the cleaned liquid through the filter membrane. The dirt is collected on the surface of the dried filter membrane, and the filter membrane is fully dried again. According to the analysis The balance weighs out the mass of the dried filter membrane before and after the filtration and cleaning, and calculates the added value to be the mass of the solid particle contaminants on the test sample. </p> <p> Typical limit of gravimetric method: For parts of specific specifications, the maximum allowable weight of residual dirt under certain sample quantity, inspection frequency, cleaning medium, cleaning and filtration methods, unit is mg Or ug. </p> <p> The choice of cleaning fluid</p> <p> There are many types of cleaning fluids used to determine and analyze cleanliness. During use, it can be used according to the requirements of the measurement method and the detergency. Corrosion and rust, whether it is harmful to the human body, whether it is flammable and explosive, whether it has a chemical reaction to the filter membrane, whether it can be recycled, the impurity content, the price, whether it is easy to equip and other factors to choose. </p> <p> At present, the commonly used ones at home and abroad are: </p> <p> * NY-120 solvent oil</p> <p> * Anhydrous ethanol</p> <p> * Trichloromethane< /p> <p> * Aviation washing gasoline</p> <p> * 95% ethanol</p> <p> * Trichloroethylene</p> <p> * Isopropanol</p> <p> * Carbon tetrachloride</p> <p> * Distilled water and demineralized water</p> <p> * Liquid detergent without solid particles</p> <p> Choice of filter membrane</p> <p> There are also many kinds of filter membranes used to determine and analyze cleanliness. The basic requirements are: flat and smooth, easy and constant weight, high drying precision, no negative value during filtration, and convenient operation. When in use, it can be selected according to the requirements of the measurement method, whether it has a chemical reaction with the cleaning fluid, the required filtration accuracy (ie, the pore size), whether it is qualified, the price, whether it is easy to equip and other factors. </p> <p> At present, the commonly used filter membrane materials at home and abroad are: </p> <p> * Mixed cellulose ester membrane (MCE) </p> <p> * Polyvinylidene fluoride membrane (PVDF) </p> <p> * Nylon membrane (NYL) </p> <p> * Polycarbonate membrane (PC) </p> <p> * Polytetrafluoroethylene membrane (PTFE) </p> <p > * Polyethersulfone (PES) </p> <p> At present, the commonly used filter membrane pore size (um ): </p> <p> 0.05, 0.22, 0.3, 0.45, 0.65, 0.8, 1.2, 3, 5 , 8, 11, 20, 30, 41, 60, 80, 100. </p>

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