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Laser Welding Technology in Medical Devices

Le 15 November 2018, 09:19 dans Humeurs 0

With the advent of lasers, people gradually realized that they have strong advantages such as high brightness, monochromaticity and directionality, and they have played an important role in scientific research, military, communications and other fields. Welding technology combines with laser to form a new waterproof laser pointer welding technology, which can effectively break through the limitations of traditional welding technology, and is therefore actively used in automotive manufacturing, aerospace and other fields.

Secondly, laser welding technology has also been widely used in medical and health applications. Due to the demanding requirements of the high cleanliness of its manufacturing process, laser welding technology meets its needs. Compared with other commonly used welding techniques, the laser welding technology produces almost no welding slag and debris, and it is not necessary to add any adhesive during the welding process, so that the entire welding work can be completed in the clean room. The addition of laser welding technology has greatly promoted the development of medical devices, such as the housing of active implantable medical devices, radiopaque markers for cardiac stents, earwax protectors, balloon catheters, etc. .

Implantable medical electronic devices, such as cardiac pacemakers, implantable electrocardiographs, and neurostimulators (spinal cord stimulators, deep brain stimulators, and implantable cochlear implants), are used to manage and treat the body's physiology Conditions such as heart rate, chronic pain, Parkinson's disease or severe deafness. In the past decade, patients have rapidly increased the use of implantable medical electronic devices at double-digit rates in order to improve the quality of life. These implantable electronic devices typically consist of microelectronic circuits and batteries that provide energy. In order to protect microelectronic circuits and batteries, they need to be sealed in a metal case. If the seal is lost, the body fluid can directly penetrate into the metal package, causing short circuit failure of the microelectronic circuit and endangering the patient's life.

Laser welding technology is the most common connection and sealing technology for implantable medical devices. The metal casing of implantable medical devices generally uses titanium and titanium alloys, but titanium has a strong ability to absorb hydrogen, oxygen and nitrogen at high temperatures, so the military laser pointer welding process needs to be carried out in an inert gas-tight environment. In laser welding, the control of laser energy plays an important role in the quality of welding. The laser illuminates the metal surface, which initially reflects 60% to 80% of the laser energy. As the temperature increases, the metal absorbs the laser energy gradually. When it reaches the boiling point, it can absorb nearly 90% of the energy.

The cardiac stent, also known as the coronary stent, is a commonly used medical device in cardiac interventional surgery and has the function of dredging arterial blood vessels. The main material is stainless steel, nickel titanium alloy or cobalt chromium alloy. During the process of transmitting the heart stent to the destination, the radiopaque lines at both ends of the stent can clearly see its trace and open state. The radiopaque markers can be made of precious metals such as gold, enamel and platinum iridium. Riveting, this molding process uses a green laser pointer with a minimum spot diameter of 40 μm (0.04 mm) to weld a disc-shaped marker into a special eyelet.

The gastroscope biopsy forceps used in medical treatment need to penetrate deep into the patient's body. Therefore, the quality of the biopsy forceps is very demanding. Each component of the composition needs to meet certain tensile strength and good appearance, especially the surface is not allowed. Glitch and other situations. In the previous production process, the front end of the gastroscope biopsy forceps is combined with riveting, resistance welding, etc., and the riveting method will leave burrs and other defects on the surface of the puncture gun, and resistance welding will also produce parts. The large deformation affects the practical application of the puncture gun, and the laser welding technology has the characteristics of non-contact processing, narrow heat influence range, high efficiency, high processing precision, etc., which can realize the flawless, no groove and no crease of the medical field. No burr and no cracking requirements.

Balloon catheter laser welding is the use of laser as the source of energy for infrared welding, which can be directly applied to the surface of the plastic that absorbs the 488nm laser pointer using a laser beam to melt the plastic for welding. The advanced laser welding technology can realize the seamless connection between the balloon tip and the tube body, so that the balloon catheter can be unimpeded when propelled in the curved and narrow diseased blood vessels, the damage to the blood vessel is minimized, and the operation process is safer.

The introduction of laser welding technology is beneficial to further reduce the outer diameter of the balloon dilatation catheter tip. A schematic diagram of the laser welded balloon catheter is shown in Fig. 8. Unlike metal welding, plastic laser welding requires less laser power. The greater the welding laser power, the larger and deeper the heat-acting zone on the plastic part will cause the material to overheat, deform, or even damage, so the laser power should be reasonably selected according to the depth of melting required. The use of plastic laser welding technology in medical devices is far more than the above applications. Plastic laser welding technology is being adopted by more and more medical device manufacturers, and its application prospects will be very bright.

In addition to the application of laser welding technology to the production of medical equipment, there are many other innovative usb laser pointer processing technologies that have great potential in the manufacture of medical equipment, such as laser surface modification, laser cutting, laser drilling and laser micromachining. Research and use of advanced laser processing technology will design more high-quality, high-demand medical equipment.

Limitations of Fiber Laser Cutting Machine

Le 20 October 2017, 12:43 dans Humeurs 0

With the progress of society and people's living standards are getting higher and higher requirements of the process is also higher and higher, the upgrading of the process is essential, especially in some industries generally use high power laser cutting equipment for processing Materials have been a huge return after some of the laser cutting machine in contact with the industry have also begun to contact the laser companies to seek cooperation, but the laser cutting machine is not a panacea, but also by some material restrictions can not be processed.

Many people think that fiber laser cutting machine is cutting machine category, and the use of imported lasers, cutting range should be very wide, the effect should be much better than other ways, it is not true, cutting machine also has a special type of points, which cutting equipment To achieve the cutting of common materials? The mainstream of the market which equipment? The following Guangzhou Aoling NC for everyone to conduct a detailed analysis.

laser pointer

The challenge of green laser pointer welding of copper is related to the two main physical properties of the material: the low absorptivity of most high power industrial lasers and the high thermal conductivity in the process. The absorption rate of copper increases as the wavelength decreases, which means that the visible band of lasers for copper soldering will have a significant advantage, but for most of the welding applications the required power range of these lasers is not yet available or has not yet been industrial verification. Infrared lasers have an absorptivity problem when handling solid materials. If the material is melted or evaporated by deep welding, the absorption rate will increase significantly.

The main market is used as cutting machine cutting machine is the mainstream of fiber laser cutting machine, its cutting a wide range of cutting speed, cutting effect is good, maintenance-free and other excellent features are widely used. In particular, the metal sheet metal cutting, fiber laser cutting machine has the advantage. Although the fiber laser cutting machine has many excellent features, but he is not a panacea, there are still many materials that can not be cut, then the fiber laser cutting machine which materials can be cut, and what materials can not cut it?

First of all we need to be clear that fiber blue laser cutting machine is a category of metal cutting machine, it is generally only used to metal processing, non-metallic materials can not be processed, such as stone, cloth, leather and other materials. The reason is that the wavelength range of the fiber laser cutting machine is no longer within the absorption range of this type of material, or is not suitable for absorption, can not achieve the desired effect.

Followed by fiber laser cutting machine can not be cut on the MDF, fiber laser cutting machine is hot, cutting the density board will cause burning, so that trimming will burn, can not meet the cutting requirements. This type of material is mainly fiberboard, wood fiber, plant fiber raw materials, and some are the application of urea-formaldehyde resin, made of synthetic resin and other materials. These types of materials belong to the scope of MDF, is currently unable to use fiber laser cutting machine for processing.

There are some highly reflective materials, such as copper and other rare metal materials, this type of material although able to use fiber laser cutting machine for cutting, but because of these materials for the laser wavelength is not the ideal absorption range of these materials, will reflect Part of the energy burned to protect the lens, which is also need to pay attention.

Currently on the market of fiber red laser pointer cutting machine equipment is mainly for the thin plate cutting, cutting in the 16mm below the advantages of thin plate is very obvious, and in the cutting plate when the efficiency is relatively low, which is subject to the power of fiber lasers. Of course, technology is in constant development, I believe that in the near future we can see Guangzhou Aoling NC production of fiber laser cutting machine can cut thick plate.

Optimization of Tooling for Laser Welding

Le 4 October 2017, 11:42 dans DIY 0

In the welding process found that the replacement of different welding products, laser welding initial proofing time-consuming, mass production process by the accuracy of parts of the weld quality instability and other issues. By optimizing the design of the corresponding tooling to reduce the automatic welding of the proofreading time to ensure the quality of weld and mass production needs. With the rapid development of industry, laser welding technology in the machinery, rail vehicles, automobile manufacturing, electronics and aerospace has been widely used. When using existing blue laser welding equipment, it is found that it takes a lot of time to calibrate the initial welding points of the parts during the replacement of the different welding products during the welding equipment. In addition, when the welding spot is limited by the size of the laser spot, Repeated positioning accuracy requirements are high, so the parts of a process of processing accuracy requirements are relatively increased, thus increasing the processing costs.

laser pen

Despite the faster cutting speed and higher productivity of high-power solid-state lasers for metal 2D cutting, most metal manufacturers are excited, but it is still costly to control and manipulate the power of such lasers. Machine tool manufacturers continue to introduce higher power lasers. But in order to give full play to this advantage, they need to design to meet the harsh requirements of the laser system. The machine itself must be able to control the changes that occur with this high power cutting to ensure that the machining is not only fast and reliable, so that the manufacturer can take full advantage of the performance of the laser.

Laser welding system is through the robot to drive the welding parts of the welding parts, welding the initial point of the collection is equivalent to CNC machine tool processing parts of the knife, a direct impact on the subsequent parts of the processing accuracy. The main factors that affect the quality of red laser pointer welding are laser power, spot size, welding speed, shielding gas, parts precision and surface quality. Among them, the size of the focus spot in the focusing lens focusing radius for the value of the premise, by the welding head and part of the weld distance decision.

In the mass production process, due to the deviation of the location of the product itself, even if the initial calibration of the welding and then accurate, there is still welding bias, missed welding phenomenon, thus increasing the laser weld tracking system. The laser weld tracking system detects the trajectory of the weld by the laser vision sensor, calculates the weld deviation using the image processing software, and then transmits the deviation to the robot control system to control the robot to move the welding head to the correct position for welding.

Laser is the use of light energy, heat, electricity, chemical energy or nuclear energy and other external energy to stimulate the material, so that the occurrence of stimulated radiation generated by a special light. The laser is the stimulated radiation of light. Compared with ordinary light source, the characteristics of the green laser pointer are obvious, the direction is good (divergence angle is small), the searchlight is irradiated to the moon, the parallel searchlight 1 km when the spot diameter of 10 meters, the laser irradiation of the moon, spot diameter is about 2 km. High brightness, good color (color purity), good coherence, the speed of light transmission (3 × 108m / s) and so are the characteristics of the laser.

The peak power of the laser is large and can reach several hundred thousand megawatts because of its large energy can be used as laser cutting, laser medical, laser weapons. In addition, laser applications are laser ranging, laser gyro, laser processing. Laser medicine, the most simple application is the teeth, teeth when the sound, each patient are reluctant to listen, but if the laser to fill teeth, you can use the laser surface tartar, insect teeth part of the cut off, no sound. Laser processing, to make a rough part of the hair to do a gear, hair only 50 microns, in this to do a flat gear, the general mechanical means is not reach, can only use the laser.

Laser cutting machine brand differentiation is the purpose of the product's core strengths or personality differences into the brand, to meet the individual needs of the target customer. Successful high power laser cutting machine brand has a differentiated characteristics, different from the competitors, and then in a consistent form of the brand differences with the customer's psychological needs to connect, in this way the brand positioning information accurately communicated to Market, in the hearts of potential customers to occupy a favorable position. The purpose is to create and cultivate their own characteristics of the laser cutting machine products, distinctive personality, establish a unique market image, to distinguish it from competitors, effectively determine the product in the customer's position in the neutral position.

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