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Why should we leave machining allowance on CNC machined parts?

As various processing technologies appear on the market, we are slowly becoming familiar with them, or recognizing them. In industry, CNC processing is still a processing technology that is widely used. However, according to many users, machining allowances are left on CNC machined parts during production. Why do they do this? The following is an introduction to titanium processing parts companies. The thickness of the metal layer removed in each process of CNC machining is called the machining allowance between processes. For torsions such as outer circles and holes, the machining allowance is considered from the diameter, so it is called symmetrical allowance (ie, two-sided allowance), that is, the thickness of the actual metal layer removed is half of the diameter machining allowance. The machining allowance of the plane is the single-sided allowance, which is the actual thickness of the metal layer removed. The goal of the residual machining allowance of the workpiece is to remove the remaining machining errors and external defects from the previous process, such as the outer chilled layer of the casting, pores, interlayers, the outer oxide scale of the forging, the decarburized layer, external cracks, and the internal stress layer after cutting. and external roughness, etc. Then, the accuracy and external roughness of the workpiece are improved. The size of the machining allowance has a great impact on the processing quality and production capacity. Excessive machining allowance not only increases the labor volume of mechanical processing and reduces productivity, but also increases the consumption of materials, indicators and electricity. CNC processing increases processing costs. If the machining allowance is too small, it will be too late to eliminate various defects and errors in the previous process, and it will also be too late to compensate for the clamping errors during this process, resulting in scrap. The standard is to minimize margins under CNC machining that ensures quality. Generally speaking, the more processing, the smaller the process allowance. When determining the CNC processing sequence, it must be clear whether the parts are pre-processed before processing. Preprocessing is often completed by ordinary machine tools. If the accuracy of the blank is high, the positioning is reliable, or the machining allowance is sufficient and uniform, pre-processing can be eliminated and processed directly on the CNC machine tool. At this time, the distinction between CNC machine tool processes must be considered based on the accuracy of the rough rough reference of the blank, so one process or divided into several processes can be completed.



The latest development trend of memory alloy processing technology

Understand the latest development trends of nickel-titanium memory alloy processing technology and explore its application prospects in various fields 1.Memory alloy is a special alloy material with shape memory and superelasticity properties. NiTi memory alloy is one of the most widely used. In the past few decades, major breakthroughs and developments have been made in the processing technology of nickel-titanium memory alloys. This article will introduce the latest development trends in nickel-titanium memory alloy processing technology.   2.First of all, heat treatment is an important part of nickel-titanium memory alloy processing. By controlling the heat treatment process of the alloy, the shape memory properties and superelastic properties of the alloy can be adjusted. In recent years, researchers have discovered some new heat treatment methods that can improve the performance stability and controllability of alloys. For example, the use of precise temperature control and aging treatment can make the alloy's shape memory properties more stable and reliable.   3.Secondly, powder metallurgy technology is increasingly used in nickel-titanium memory alloy processing. Powder metallurgy technology can prepare more uniform alloy materials and can finely control the microstructure, thereby improving the mechanical properties and memory properties of the alloy. In addition, powder metallurgy technology can also realize mass production of alloys and improve production efficiency.   4.In addition, laser processing technology is a very promising method for processing nickel-titanium memory alloys. Laser processing can achieve fine processing and microstructure control of alloy materials, while also avoiding the formation of heat-affected zones. This processing method is highly efficient and precise and can be used to manufacture micro devices and precision components.   5.In addition, in recent years, nanotechnology has gradually developed in the processing of nickel-titanium memory alloys. Nanotechnology can prepare alloy materials with nanoscale grains and interfaces, thereby improving the mechanical properties and memory properties of the alloy. In addition, nanotechnology can also achieve fine control of the morphology and structure of alloy materials, allowing the alloy to have better performance.   6.In short, with the continuous advancement of science and technology, nickel-titanium memory alloy processing technology is also constantly innovating and developing. The application of new technologies such as heat treatment, powder metallurgy, laser processing and nanotechnology will further improve the performance and application scope of nickel-titanium memory alloys. It is believed that in the near future, nickel-titanium memory alloys will be more widely used in medical, aerospace, automotive and other fields.   7.[Introduction to the article] Memory alloy is a special material, and nickel-titanium memory alloy is the most widely used one. Among the latest development trends, heat treatment, powder metallurgy, laser processing and nanotechnology have become key. Through these technologies, the performance of nickel-titanium memory alloy will be further improved and its application range will be wider.



Cobalt-based alloy (GH901) chemical composition and antioxidant properties

GH901 is an austenitic age-hardening alloy based on Fe-43Ni-12Cr, with titanium, aluminum and equal strengthening elements added. It also contains trace amounts of boron and lower carbon. It is metastable γ"[Ni3(Ti, Al)] phase dispersion strengthening, and trace amounts of aluminum can inhibit the transformation of γ" to eta-Ni3Ti phase. The alloy has high yield strength and durable strength below 650°C, good oxidation resistance below 760°C, and stable structure for long-term use. This alloy is a relatively mature alloy developed in the early stage and is widely used in the manufacture of rotating disk parts (turbine disk, compressor disk, journal, etc.), static structural parts, turbines of aviation and ground gas turbine engines operating below 650°C. Outer rings and fasteners and other parts.   1. Chemical composition of cobalt-based alloy (GH901)   C Cr Ni Mo Al Ti Fe B 0.02~0.06 11.0~14.0 40.0~45.0 5.0~6.5 ≤0.30 2.8~3.1 Remain 0.01~0.02 Mn Si P S Cu Bi Pb Ag no greater than no greater than no greater than no greater than no greater than no greater than no greater than no greater than 0.50 0.40 0.020 0.008 0.20 0.0001 0.001 0.0005     2. Cobalt-based alloy (GH901) similar brands: Incoloy901 (USA), Nimonic901 (UK), Z8NCDT42 (France), 2.4662 (Germany) 3. Cobalt-based alloy (GH901) processing performance: Cobalt-based alloy (GH901) has good hot forming properties.   1. Forging Larger steel ingots are not allowed to be cooled directly to room temperature, but should be moved directly into the forging heating furnace to prevent them from passing through the aging temperature range during cooling and reheating. The ingot should be forged into a billet with a side length of 205mm, and then quickly cooled and trimmed. During forging, process parameters should be strictly controlled to prevent serious unevenness of coarse and fine grains (there is an obvious boundary between the two) and ensure stable performance. 2. Welding performance Argon arc welding can be performed using GH901 alloy welding wire. 3. Parts heat treatment process When heating the engine turbine disk heat treatment, excessive heating speed should be avoided.   4. Antioxidant properties of GH901 Oxidation rate after 100h test in air medium, corrosion resistance of GH901 alloy is prone to pit corrosion in hydrochloric acid solution.   θ/℃ 600 700 800 900 1000 Oxidation rate/(g/(m3·h)) 0.0072 0.0140 0.0522 0.1665 0.2367  



Wide range of applications of high temperature alloys

High-temperature alloys refer to metal alloys that can maintain stability and excellent performance in high-temperature environments. They generally have good resistance to heat, oxidation and corrosion. Superalloy is a new type of material that can be used in high-temperature environments that was researched and developed by the National Aeronautics and Space Administration (NACA) in the 1930s. These studies have mainly focused on nickel- and cobalt-based alloys by exploring ways to improve their high-temperature strength and oxidation resistance. Common types of high temperature alloys: Nickel-Based Superalloys: Nickel-Based Superalloys are one of the most common high-temperature alloys. They have good high temperature resistance, high strength and corrosion resistance. Nickel-based superalloys are widely used in aerospace, energy and chemical industries, such as in the manufacture of aircraft engine components, gas turbines and combustors. Cobalt-Based Superalloys: Cobalt-Based Superalloys are another common type of high-temperature alloys. They have excellent high temperature strength, thermal creep resistance and corrosion resistance. Cobalt-based superalloys are commonly used in high-temperature gas turbine engines, chemical reactors and nuclear energy applications. Iron-Based Superalloys: Iron-Based Superalloys are high-temperature alloys based on iron. They have lower cost, good mechanical properties and corrosion resistance, and are used in some specific high-temperature applications, such as steam turbine components, combustors and high-temperature gas turbines. Titanium-Based Superalloys: Titanium-Based Superalloys are based on titanium and have excellent high-temperature strength, corrosion resistance and low density. They are often used in aerospace applications, such as turbine blades and structural components of aircraft engines. Elements such as tungsten, molybdenum, niobium, etc. and their alloys are also widely used as high-temperature alloys for specific high-temperature applications, such as high-temperature furnaces, vacuum furnaces, and high-temperature chemical reactors. Among them, the widely used high-temperature alloys on the market include Inconel, Monel, Hastelloy, etc., all of which are nickel-based high-temperature alloys. Inconel is the trademark of a series of alloys developed by Inco Alloys International (now Huntington Alloys Corporation) in the 1940s. Inconel alloys have excellent high-temperature strength and are able to maintain high mechanical properties at extreme temperatures. This gives them excellent durability in high temperature environments. Excellent corrosion resistance, including resistance to acids, alkalis, salt water, seawater and oxidizing gases. This makes them widely used in the chemical industry and marine environments. Inconel alloy can resist oxidation and high-temperature oxidative corrosion in high-temperature environments, maintaining material stability and surface integrity. Although Inconel alloys have good high-temperature strength, they still have relatively good machinability and can be processed by forging, welding, cutting and forming. Material inconel 600 601 617 625 718 X750 800 825 Mesh size Plain/twill weave:1-250 mesh Dutch weave:7*40-200*1800 mesh Aperture 0.01-20 mm or customized Width 1 1.22 1.5 2 meters width or customized Length 30 50 meters Application Flue Gas Desulfurization Plants Food Processing Heat-treating Equipment Marine Muffle Furnaces Oil & Gas Industry Pollution Control Radioactive Waste Treatment Plants Seawater and Brackish Water Inconel 625 wire mesh (Alloy 625) is a nickel-chromium-molybdenum-niobium alloy designed for applications requiring resistance to both corrosion and extreme temperatures. Due to the solid-solution effects of the molybdenum (~9%) and niobium ([+tantalum] ~3.65%) in the nickel-chromium matrix, Alloy 625 demonstrates superior mechanical performance in extreme temperatures as compared to Alloy 600. As such, Inconel 625 wire cloth maintains outstanding strength and toughness in environments with temperatures from cryogenic to 1800°F. Its high nickel (~61%) content gives Alloy 625 wire cloth excellent resistance to pitting and crevice corrosion, chloride stress-corrosion cracking, and a wide array of inorganic and organic compounds. When compared to pure Nickel 200 and Nickel 201, the high chromium (~21.5%) content of Inconel 625 wire mesh gives it superior  



The difference between tungsten weight gain tape and lead weight gain tape

The main difference between tungsten weight gain tape and lead weight gain tape lies in the materials used and their respective properties. Here are some key points to consider: Material: Tungsten weight gain tape is made of tungsten, a dense metal known for its high density and weight-to-volume ratio. Lead weight gain tape, on the other hand, is made of lead, which is also a dense metal but typically less dense than tungsten. Density: Tungsten is denser than lead, meaning that a smaller amount of tungsten can provide the same weight as a larger amount of lead. Tungsten has a density of approximately 19.25 grams per cubic centimeter (g/cm³), while lead has a density of about 11.34 g/cm³. Weight-to-Volume Ratio: Due to its higher density, tungsten weight gain tape can offer a more compact and concentrated weight adjustment compared to lead weight gain tape. Tungsten tape allows for precise weight customization without adding excessive bulk to the paddle. Safety Considerations: When considering the safety aspect, it's worth noting that lead is a toxic metal. While lead weight gain tape is generally safe to handle when properly applied and not ingested, it's important to take precautions during installation and avoid any potential exposure to lead dust or particles. Availability and Regulation: Tungsten weight gain tape has gained popularity in recent years and is commonly used in various sports, including pickleball. Some sports organizations and tournaments may have specific rules regarding the use of certain materials, so it's essential to check the regulations to ensure compliance. Ultimately, the choice between tungsten weight gain tape and lead weight gain tape depends on personal preference, specific weight adjustments desired, availability, and adherence to regulations. It's recommended to consult with experienced players, coaches, or paddle manufacturers for advice on the most suitable weight gain tape for your needs.