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From hips and knee joints to complex engine fuel nozzles, metal additive manufacturing – a 3D printing method involving lasers and metal powders – enables traditional processes to be manufactured in terms of time, cost, and geometric complexity. Unmatched parts.
Recently, a group of researchers from the Missouri University of Science and Technology are working with Honeywell Federal Manufacturing & Technologies on selective laser melting (SLM) based on metal powder beds. Technology for material analysis. Professor Ming Leu, director of the Center for Intelligent Systems at the University of Missouri University, led the project, which also included seven other professors.
The so-called selective laser melting technology refers to the use of a focused laser beam to rapidly melt the metal particles on the powder bed layer by layer according to the trajectory specified by the CAD model, and solidify it into a desired shape. This technique can create an extremely internal Complex parts.
“One of the main advantages of this technology is that it minimizes manufacturing time,†Professor Leu said. “It has a big advantage over traditional methods. With metal additive manufacturing, you can create those that are very complex. Geometric features and internal structural components that cannot be completed using traditional methods."
Using Honeywell's equipment purchased and installed in Toomey Hall for this collaborative project, Leu and his colleagues have four research goals: predicting the properties of 3D printed metal parts, controlling the microstructure to achieve the desired properties, and making the powder Reuse to maximize and increase product sustainability.
It is understood that this five-year project received a total of $6.5 million in funding, of which $5 million was for personnel and other expenses, and $1.5 million was purchased, leased, and placed in Missouri Technologies by Honeywell. equipment. The project consists of five tasks: powder characterization, material property description methods, material properties, effects of temperature on material properties, control of microstructure and mechanical properties, and chemistry associated with additive manufacturing. Stainless steel 304 L will be the starting material they used at the beginning.
“We will look at how the process parameters affect the mechanical properties of the manufactured parts and how to control them to achieve the desired properties.†Leu says: “Laser power, beam diameter, lateral movement speed, line spacing and layer thickness can all be Affects the manufacture of parts." In addition, chemical composition and ambient temperature can also affect component properties, he said.
In addition, the research team will also study how to reuse the remaining powder to reduce raw material costs. Leu said that a key issue in the middle is that the thermal effects around the parts can cause the powder to degrade or agglomerate, making parts that may not be as good as the original material when used again, with consequences including use. Reusing metal powder may result in lower strength of parts and the like.
In addition to the eight professors at the University of Missouri, the project also includes approximately 15 graduate, undergraduate and postdoctoral fellows.
Concerned about surprises
Chopped Graphite/Graphite Electrode in different materials have different definition of graphite pieces, some data and literature is not very big graphite particles are called graphite pieces (such as Graphite Powder) some is graphite products have a certain size, for Graphite Broken into patches, we here say of graphite for a second, usually called graphite blocks. Graphite is produced from graphitization and machining process of graphite products. It is used as additive and conductive material in the manufacture of graphite waste in steel and foundry industries, and can also be processed according to customer's requirements. They are also widely used in electric arc furnaces (steelmaking) and electrochemical furnaces (metallurgical and chemical industries).
Main use of graphite
Graphite pieces due to its low ash content, conductive and heat conduction performance is good, so there are a wide range of USES, can be added to the formula of less ash or dust products, graphite broken broken into small particles commonly use. Ingredients to add a certain amount of graphite, the plastic paste after kneading, especially during extrusion can reduce the friction resistance paste to squeeze the mouthpiece, to improve the coefficient of pressure type. Graphite pieces of coal adsorption properties of asphalt is better, to join the carbon block can rise to reduce the "short" waste (i.e., the product after roasting top produce honeycomb structure), and can improve the thermal conductivity of the carbon block and alkali corrosion resistance. The electrode paste used in hermetically-sealed thermal furnace is added to a certain amount of graphite to increase the conductivity and thermal conductivity of the electrode paste and accelerate the sintering speed of electrode paste. When the graphite is ground into small particles or fine powder, it is also used as raw material for the production of graphite chemical equipment (such as graphite-resin tubes). The graphite can also be used as a carbon addition agent for the electric furnace.
Graphite classification
1. Raw and broken. It is a raw blank that is not qualified after molding.
2. Roasting is the cutting debris that is recovered after the roasting of raw billet and after inspection of unqualified waste and the processing of calcined products.
3. The graphite is broken, and it is inspected by the graphite-producing waste and the cutting debris produced by graphite products in the process of processing.
Graphite Broken
Graphite Broken,Broken Graphite Electrode,Graphitized Anode Broken,Graphite Tablets
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