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Laser Marking Machine

Fiber Marking Machine, CO2 Laser Marking Machine

 

 
What is Laser Marking Machine
 

Laser Marking Machine engraves the letters onto object or process an object by using the heat of laser beam. It is easy to fade away if printed by ink, or printed labels ended up by coming off. However, Laser Marking Machine can mark to an object including non-flat surfaces and will remain permanent.The laser marking technology creates lasting marks on component surfaces by generating focused beams of light containing high energy levels. The built-up energy is released in the coherent light beam directed at the material surface using mirrors. As a result of the light beam interacting with the component’s surface, there is a transfer of heat energy from the beam to the surface. Therefore, the appearance and properties of the material will change. Depending on the energy level, the laser can engrave, etch, anneal, or discolor surfaces with great precision.

 

Advantages of Laser Marking Machine
01/

Permanent marks
Laser marking machines mark permanently. The marks cannot be rubbed off or fade away through time or exposure to contaminants.

02/

Fast marking
Laser marking can be a quicker and more efficient marking process than chemical etching and inkjet printing. Chemical etching requires many steps that can last days, and laser marking happens instantaneously. Inkjet printing/labeling has consumables and replacement parts that can slow down the process and often lead to downtime—laser marking technology does not.

03/

Versatile use
Purchasing laser marking technology is an addition to your toolbox beyond just a basic marking system. Laser marking machines are effective on a range of materials, sizes, industries, and processing methods.

04/

Precision and accuracy
Laser marking offers unparalleled precision and accuracy in marking various surfaces. The laser beam is extremely fine and can create very small, intricate designs and markings that would be impossible to achieve with other methods. This makes it ideal for marking small parts, including those with complex geometries.

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Why Choose Us
 

Rich Experience

UNISTRCNC boasts professional technical and research teams with extensive experience in CNC routers, ATC CNC routers, laser machines, laser cutting machines, laser marking machines, CNC metal engraving machines, CNC plasma cutting machines, and fiber metal cutting machines.

 

Professional Team

Shandong Unistar Machinery Co.,Ltd specializes in manufacturing and exporting CNC machines and laser machines since 2002. The company operates two large factories, one dedicated to CNC routers and the other to laser machines.

 

Certificate of Qualification

All our products have obtained CE, FDA, and SASO certificates, ensuring quality assurance.

 

Problem Solving

Our technical engineers solve customer problems promptly, ensuring customer satisfaction and worry-free machine usage.

 

How Does Laser Marking Machine Work
 

Step 1: Generation of the Laser Beam
The generation of the laser beam in any laser marking equipment depends on three important components:
The lasing medium is responsible for the wave position and the excitation energy required by the machine. Common lasing mediums include neodymium-doped yttrium aluminum garnet (solid) and organic dyes (liquid), and CO2 (gas). The lasing medium can also be a geometric shape, such as the fiber lasers.

 

The pump source is responsible for introducing energy to the laser marking machine, which excites the lasing medium and leads to photons’ emission through spontaneous or stimulated emission.

 

The optical resonator has a reflective (high reflector) and partially reflective (output coupler) mirror. It functions in reflecting the light produced by the lasing medium. It can also contain other things, such as a modulator and q-switch, that can change the generated laser beam properties.

 

Energy becomes introduced into the lasing medium. This leads to the excitation of the lasing medium atoms and the emission of photons. The light enters the optical resonator and undergoes total internal reflection to create the laser beam. The laser can then be passed to components such as the q-switch, lenses, beam expanders, etc., to shape the beam before releasing it.

 

Step 2: Marking
When the laser beam touches the workpiece’s surface, the heat energy produced causes a change in the features and attributes of the material. The types of change depend on the laser technology you choose. A permanent mark is then left on the surface of the workpiece.

 

Common Types of Laser Marking Machine Techniques
 

There are several laser marking systems applicable in part manufacturing processes. Each has its mechanism for using the laser. For example, laser engraving removes parts of a material. Hence, it is applicable in logo or character processing. The three most common laser marking types include:

 
Laser engraving

Laser engraving is the most common marking method in part manufacturing and prototyping, suitable for working on materials like metals, ceramics, and plastics. Like any laser marking method, it delivers permanent marking, although it has less clarity than others on the list.
Laser engraving is a subtractive process, i.e., it involves using the laser beam to remove part of the material surface. The laser beam focusing on the surface turns the removed material into plasma or vapor removed by the fume extractor. On removal, it leaves an engraved marking that is easily felt by the fingers.

 
Laser etching

Laser etching is another marking method for making permanent marks on a workpiece. It commonly applies to metals such as etching aluminum, steel, stainless steel, lead, etc. The laser marking machine etches the workpiece by releasing pulsed laser beams on the workpiece surface. On hitting the surface, the material absorbs the beam and converts it to heat to melt the surface and raises it.
The laser-etched surface requires less energy as it does not have depth, unlike laser engraving. Furthermore, they are more visible. For example, laser-etched aluminum will be more visible than laser-engraved aluminum.

 
Laser annealing

Laser annealing is a non-subtractive process commonly used for products with important dimensional accuracy. It involves using laser beams to slowly heat and cool metal surfaces to modify their color (yellow, red, or green) depending on the temperature of the metal’s surface.
The laser annealing process is not suitable for non-ferrous metals and aluminum because their colors are not affected by the influence of heat and oxide.

 

 

Types of Lasers Marking Machines
Gold And Silver Jewelry Fiber Laser Marking Machine Laser Marker
20W/30W /50W Desktop Fiber Laser Marking Machine On Metal/Stainless Steel For Sale
50W/70W/100W Fiber Laser Deep Engraving For Gold Silver
Automatic dynamic focus Laser Marking Machine

CO₂laser markers
CO₂laser markers use CO₂as the lasing medium and the most suitable marking system for organic materials (they are also suitable for metals after treating the metal with a special marking agent, which gives it a permanent, high contrast mark).
They have the longest wavelength (10600nm) of all laser marking systems, which makes them useful in marking different materials as required by different industries. Furthermore, they also provide faster marking speeds when working with thick materials, especially in sheet metal laser cutting.

 

Fiber laser markers
Fiber laser markers are a newer, simpler, and more versatile marking system that uses high-tech fiber optics as a lasing medium. They are suitable for marking non-organic materials like metal, steel, aluminum, etc.The fiber laser marking system has high marking speeds and consumes less energy. Furthermore, they require low maintenance. However, they are unsuitable for marking thick materials.

 

Green laser markers
Green laser markers have a high wavelength (532nm). They are suitable for marking highly reflective and sensitive materials like PCB boards, soft plastics, etc. In addition, they create highly precise markings on workpieces and can absorb different types of materials.

 

MOPA laser markers
Master Oscillator Power Amplifier (MOPA) lasers are applicable in creating black markings on high-quality metals and plastics. They use a master oscillator to generate the beam, and the power amplifier increases the output power level.

 

Applications of Laser Marking Machine

 

Automotive industry

Laser marking is widely used in the automotive industry for various purposes. It is commonly employed for part identification, allowing easy tracking and identification of components. Traceability codes and serial numbers are laser marked on engine parts to ensure accurate documentation and quality control.

01

Electronics industry

Laser marking is a vital process in the electronics industry for marking metal components with identification codes, logos, and other essential information. This technique enhances brand recognition and ensures product authenticity, making it a valuable branding tool.

02

Medical industry

Laser marking is widely used in the medical industry to mark medical devices with important information. It creates precise surface markings on metal, such as lot numbers, manufacturing dates, and regulatory symbols. These identifiers are crucial for tracking instruments throughout their lifecycle, ensuring proper maintenance, and preventing mix-ups during surgeries.

03

Jewelry industry

Laser marking is used in the jewelry industry to mark precious metals and gemstones with identification marks, logos, or personalized engravings. This adds value to the jewelry and helps in authentication.

04

Packaging industry

Laser marking is used to mark the surface of metal packing materials with information like batch numbers, expiry dates, and barcodes. This helps in efficient inventory management and product traceability.

05

 

Factors to Consider When Purchasing a Laser Marking Machine
 
 
 

When purchasing a Laser Marking Machine, there are several important factors to consider to ensure that you make the right choice and get the best possible performance from your machine. Here are some of the most important factors to consider.

 
 

Laser type
There are different types of lasers used in laser marking machines, such as fiber lasers, CO2 lasers, and UV lasers. The choice of laser type depends on the material to be marked and the desired marking quality.

 
 

Marking speed
The marking speed of a laser marking machine determines how quickly it can mark the desired patterns or texts. Laser speed setting is also important as it will affect the level of precision for your laser cuts. It determines the movement speed of the laser head. For engraving and cutting of thin material, the speed is usually set (close) to the maximum. Consider the production volume and engraving speed requirements when choosing a machine.

 
 

Power output
Choose a laser marking machine with sufficient laser power output to effectively use laser engraving materials or mark different workpieces. The power output of the machine determines its ability to cut or use different materials effectively. At low power, the flammable materials such as wood, cardboard, the edges of the cut may burn rather than vaporize. It is crucial to select a machine that can handle the level of intensity needed for your desired engraving or marking applications.

 
 

Material compatibility
Ensure that the laser marking machine you choose can effectively mark the materials you work with. Different laser machines have varying capabilities. Plastics, glass, and more. Consider the type of materials you frequently work with and verify that the machine is compatible.

 
 

Marking area
When choosing a laser marking machine, it is crucial to consider the size of the engraving area that you require for your products or components. Laser marking machines are available in different sizes, so it’s important to select one that offers an adequate marking area for your specific needs. Make sure to take into account the dimensions of your products or components to ensure they fit within the machine’s designated workspace.

 
 

Software and connectivity
Look for a laser marking machine equipped with user-friendly software and compatibility with other systems. The laser engraving software should allow you to easily design and control your markings, providing flexibility in creating custom designs or patterns. Consider connectivity options such as USB or Ethernet ports for seamless integration into your existing workflow.

 

 

Components of Laser Marking Machine

Cabinet
Also called laser marking machine cabinet, laser control cabinet. If a laser marking machine is compared to a house, then the cabinet is the structure of the house, and all other accessories are installed in the house.

 

Galvanometer, field lens
The galvanometer and the field lens form the laser marking head. The galvanometer is the core component that controls the change of the optical path, and the field lens is an important component that controls the laser marking format.

 

Industrial computer, display
The industrial computer and the display are actually our commonly used PCs. The difference is that they are connected in series with optical signals and electrical signals to control the entire software part.

 

Laser
Laser is the core device of fiber laser marking machine. High-quality lasers have long life, good marking quality and fast marking speed. Laser manufacturers are now very different in China.

 

Marking card
The laser marking card is one of the core components of the entire software control part. The adjustment of the process parameter setting is done through the marking card, which is actually a set of software EzCad.

 

How Do You Maintain the Laser Marking Machine
 

Precautions before use
Before using the laser marking machine, several precautions must be taken to ensure safe and efficient operation. Firstly, always wear safety gear such as safety glasses, gloves, or any other required personal PPE.

Secondly, ensure proper ventilation in the working area. It prevents the accumulation of fumes and smoke produced during marking.

Thirdly, confirm that the material to be marked is compatible with the laser’s wavelength. Always use the recommended materials by the manufacturer.

Fourthly, secure the work area and ensure it is clean, organized, and free from potential hazards.

Finally, always familiarize yourself with emergency shutdown procedures. Find the location of the emergency stop button.

 

Daily Maintenance
Wipe down the dust and debris after or before using the laser marking machine. Ensure the exterior surface, focusing lens, and galvanometer mirrors are clean and ready to use.

Secondly, verify that the laser beam is correctly aligned and focused for precise marking. Make necessary changes if required. You can use the adjustment screw to align the height of the galvanometer.

Thirdly, ensure the cooling system is functioning correctly. In addition, check that the water or cooling fluids are at the correct levels.

Fourthly, confirm that the operation switches are expected and effective.

 

Weekly Maintenance
A weekly maintenance routine contributes to the longevity of the device. Firstly, clean the optical path components, including mirrors and lenses. It prevents any buildup that could affect marking quality.

Secondly, check whether the laser light output is expected and open the laser marking software. And then start manual marking for laser testing.

Thirdly, verify if you can turn on the red light preview. Ensure the laser parameters are within the designated range. In addition, enable the red light correction feature within the laser marking software.

 

Monthly Maintenance
Monthly maintenance focuses on deeper checks and cleaning. It involves checking the laser sources and control unit. Firstly, check whether the laser emitted is expected. If it has weakened, use a power meter to test and conduct necessary solutions.

Secondly, inspect if the power plug and connectors of the connecting cables are secure. If there are any loose contacts, take action immediately.

Thirdly, clear dust from the laser’s air outlet to maintain proper heat dissipation. Remove foreign particles and debris from the device using a vacuum cleaner, alcohol, and a dust-free cloth.

 

Half-yearly maintenance
Every six months, the laser marking machine requires more thorough maintenance. During this period, check the exhaust system and safety features. Clean or replace filters in the exhaust system to maintain efficient fume extraction. Test the safety interlocks, emergency stop buttons, and other safety mechanism.

Clear the dust from the laser’s air outlet to maintain proper heat dissipation. Remove foreign particles and debris from the device using a vacuum cleaner, alcohol, and a dust-free cloth.

 

FAQ
 
 

Q: What does laser marking machine do?

A: In simplest terms, laser marking is a permanent process that uses a beam of concentrated light to create a lasting mark on a surface. Typically performed with a fiber, pulsed, continuous wave, green, or UV laser machine, laser marking encompasses a wide variety of applications.

Q: What is the effect of laser marking?

A: It is achieved by moving a low-powered beam slowly across the material using a method called discoloration, which creates high-contrast marks without disrupting the material. Laser heats the material, causing oxidation under the surface and turning the material black.

Q: What is laser marking or engraving?

A: Laser marking refers to placing legible information onto the surface of a part with little or no penetration. In contrast, laser engraving refers to putting information onto a part with evident penetration below the surface of the material

Q: Does laser marking use ink?

A: Consumables: Laser systems do not use ink, solvent, or any other consumable to mark materials.

Q: How accurate is a laser marking machine?

A: Industrial laser marking machines have a few factors that can influence accuracy. One is the size of the beam spot on your material. The smaller that spot is, the more precise the laser can get. Another is the quality of the optical system and thermal control.

Q: Does laser marking remove material?

A: The result is a change in color on the surface without altering the texture or removing material. Staining: Staining uses the laser to create some kind of chemical reaction, such as charring on plastics. The soot that forms when plastic is heated makes a dark mark.

Q: Does laser marking fade?

A: Utilizing laser engraving on a material such as tungsten or ceramic will produce marks that will not scratch or fade in time thanks to the material's durability. Plastics, metals, and many other surfaces are also all ideal laser marking materials.

Q: What thickness is laser marking?

A: Laser marking in Engrave, Burn, Silver, Outline and Ablate is available on sheet metal and CNC machined aluminum panels, parts and enclosures, so long as the material thickness is 0.051” or greater.

Q: How many types of laser marking are there?

A: Besides the three main types of laser engravings, understanding the different laser marking processes can help you decide which laser marking system best fits your industry. These processes are carbon migration, annealing, foaming and coloration.

Q: How do I choose a laser marking machine?

A: Each of these adapts to one material more than another. In general, we know the Fiber laser for its total effectiveness on metals. The Green Wave laser is more suitable for plastics, like the more famous UV laser. The CO2 laser is the most widely used for marking organic materials.

Q: How fast is laser marking?

A: The theoretical speed of the manufacturer is 9000mm/s, and some marking opportunities are lower than this speed, about 7000mm/s. Of course, the actual speed will be lower than the theoretical speed.

Q: What material is not recommended to be cut by laser?

A: Polycarbonate is a poor choice for laser cutting. It creates long stringy clouds of soot that float up, ruin the optics and mess up the machine. ABS Melts / Cyanide ABS does not cut well in a laser cutter.

Q: Does laser engraving last long?

A: Most metals are a popular choice for laser engravings; some will last decades, even centuries, but this depends on, among other things, the type of metal. Soft metals such as copper, brass and aluminium are more prone to engraving fading than harder metals such as stainless steel and other materials.

Q: How do you know how powerful a laser is?

A: You can use a photodiode or thermopile to measure laser power. Photodiodes are much more sensitive and they're the only solution for very low powers. The complete power range of PD sensors (with and without attenuating filters) is from 10 pW to a few Watts.

Q: What is the difference between laser marking and laser engraving?

A: Laser marking refers to placing legible information onto the surface of a part with little or no penetration. In contrast, laser engraving refers to putting information onto a part with evident penetration below the surface of the material.

Q: How deep is laser marking?

A: When it comes to deep engraving, the depth can easily reach a few millimeters into metals. This is in stark contrast with regular laser engraving, which is typically only a few microns deep. But regular laser engraving can also be deep—up to 500 microns. This is often the case with shotblast resistant laser marking.

Q: Does laser marking fade?

A: Utilizing laser engraving on a material such as tungsten or ceramic will produce marks that will not scratch or fade in time thanks to the material's durability. Plastics, metals, and many other surfaces are also all ideal laser marking materials.

Q: Does laser marking remove material?

A: The result is a change in color on the surface without altering the texture or removing material. Staining: Staining uses the laser to create some kind of chemical reaction, such as charring on plastics. The soot that forms when plastic is heated makes a dark mark.

Q: How do you maintain a laser machine?

A: Don't use a laser engraver near any possible heat source, including vents and air ducts. Properly maintain your machine with cleaning kit (wipes, alcohol) provided by the manufacturer. Avoid oil or grease build up. Periodically verify that safety interlocks are working properly.

Q: What PPE is required for laser marking?

A: PPE includes items such as safety glasses, gloves, and protective clothing, which help prevent injuries and keep operators safe. One of the most crucial pieces of PPE for laser engraving is safety glasses. Safety glasses are designed to protect the eyes from laser radiation, which can cause severe eye damage.

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