The History Of Selective Laser Sintering Technology

Do you know the history of selective laser sintering?

Custom Selective Laser Sintering, also known as laser beam cutting, involves cutting solids with the help of pulse or continuous laser radiation. According to the current technical level, almost all types of materials, including metals, can be cut by laser beam without contact. This process is particularly popular in sheet metal processing because it is flexible and cheap. Whether it's rectangular, triangular, circular, circular, or individual cuts. Do you know the history of selective laser sintering?

The history of selective laser sintering technology

Albert Einstein assumed stimulated radiation in his paper "quantum theory of radiation" in 1916, which laid the foundation for sheet metal cutting using laser radiation. In 1939, Russian physicist and university professor Valentin Fabrikant proposed using stimulated radiation to amplify the theoretical radiation.

In 1950, American physicist Charles towns and Russian and Soviet physicists Nicolas Basso and Alexander Prokhorov developed the quantum theory of stimulated emission, and provided evidence for the stimulated emission of microwave. Nine years later, Gordon Gould, a graduate student at Columbia University, assumed that stimulated emission could be used to amplify light. He described an optical resonator that can produce coherent light and called it laser, which is short for stimulated radiation light amplification.

In 1960, Theodore Maiman, an American physicist, developed the first laser working prototype at the Hughes Institute in Malibu, California. This method uses synthetic ruby as active medium and emits a dark red beam with a wavelength of 694.3 nm. It was first used in military rangefinders. Today, due to its high peak performance, it is commercially used to drill holes in diamonds.

In 1963, Chandra Kumar Patel, an Indian electrical engineer and physicist, developed the first carbon dioxide (CO2) laser at the Bell laboratory research institute of at T. This type of laser is more cost-effective and efficient than ruby laser. These characteristics help CO2 laser achieve a global breakthrough as an industrial laser. If you are interested in more selective laser sintering information, is the best china inspection go to.


How is the selective laser sintering generated?

In the case of laser beams, light is amplified by absorbing and emitting energy. The required energy is provided by a radiation source, which consists of an active laser medium, a pump system, a harmonic oscillator and a system composed of optical elements such as mirrors and lenses. According to the waveform, it can be divided into continuous wave and pulse lasers, and according to the type of laser medium, it can be divided into gas, solid, dye and free electron lasers. Despite this subdivision, the function of each laser type is the same, because in all cases, optical amplification is achieved through energy absorption and emission. The energy is bundled through the resonator to produce a laser beam with high power density.


How does selective laser sintering work?

The thermal cutting process consists of two simultaneous parts. On the one hand, the focused laser beam is absorbed at the interface, which brings the energy needed for cutting. On the other hand, the cutting nozzle aligned concentrically with the laser provides process or blowing to keep the steam and spatter away from the focusing optical system, while removing the cut to remove the material residue.

Depending on the temperature reached in the effective area and the type of process gas supplied, the joint material can be in different aggregation states. According to whether it is liquid, oxidation product or vapor, the following three Selective Laser Sintering variants can be distinguished:


Selective laser sintering cutting

In this sheet metal processing method, the material is melted along the cutting contour by laser radiation, and then the resulting melt is blown out by high-pressure gas jet. The precise supply of laser beam energy prevents the formation of unwanted oxides. The fusion cutting is extremely accurate, which can ensure that the product has a very high cutting quality.

Selective Laser Sintering

Flame cutting is based on the same function as laser beam melting cutting, but it is mainly used for cutting thick materials. Using this method, pure oxygen is added at the intersection point to react with the material and generate high heat energy in the process. As a result, the material is cut at a specific point while the resulting melt is blown out of the cut.


Laser beam sublimation cutting

In this process, the material evaporates and generates a lot of heat. This process is called sublimation, which prevents the formation of material melts. The gas jet is not used to blow off the incision, but to protect the sensitive mirror and lens. A typical example of this process is cutting plastic with clear edges.


Which materials are suitable for customized selective laser sintering?

Selective Laser Sintering can accurately process all fusible materials up to 50 mm in thickness. Technical work varies from material group to material group. For example, when machining steel, the power density of the laser beam is significantly lower than when cutting aluminum or brass, because these metals have high reflective surfaces and high thermal conductivity. For the best results, different laser systems are used depending on the material.


What are the advantages of Selective Laser Sintering?

Selective Laser Sintering has revolutionized metalworking. So far, there is almost no more flexible or cheaper sheet metal processing method. The main advantages are as follows:

  • Even if the minimum quantity is low, it is cost-effective,
  • Highly flexible in shape and material,
  • High material utilization rate and high economic benefit,
  • Very fine, usually no rework trimming,
  • By eliminating the need to change tools, the setup time is shortened,
  • Multiple orders are compatible in one step,
  • You can create sculptures and markers parallel to the cut.