Global industrial laser market trend analysis: fiber laser into the main

REVIEW: Estimated global industrial laser market will grow from $ 4.6 billion in 2015, up to $ 6.3 billion in 2020, the annual compound growth rate of over 6.6%.

OFweek Laser News: According to BCC Research data show that the global market for industrial lasers is expected in 2015 from 4.6 billion US dollars, up to $ 6.3 billion in 2020, the annual compound growth rate of over 6.6%. When this growth trend, mainly due to the strong performance of the fiber laser, product quality requirements for suppliers to grow based on productivity concerns and industrial users.

The next few years, the Asia-Pacific region is expected to become the largest market for industrial laser applications, including China, Japan and South Korea will be a key factor driving market growth, mainly due to automation and the development of new industries.

In the weak global economic environment, industrial lasers will continue to exhibit growth, mainly due to the continuous development of technology opportunities. Emerging fields such as disk lasers and fiber lasers will bring a strong growth momentum. Wherein the fiber laser performance significantly, in 2020 is expected to reach $ 1.9 billion market size, the annual compound growth rate of 8.5%, exceeding the overall industry growth rate of the laser.

Peak power and nanosecond pulse, very suitable for marking and engraving applications. Coupled with small size, high reliability and low cost of ownership, so that the terminal industrial users more popular fiber lasers.

The purchase of a laser device, select fiber lasers or CO2 lasers?

REVIEW: As a user, you seem to understand the respective fiber lasers and CO2 lasers bane. The so-called Achilles heel is the cutting of the blind spot. Avoid the Achilles heel (blind), and then compete competing short length, suitable for the needs of that one selected.

Laser News: frequently asked: for industrial processing, fiber lasers and CO2 laser which is better? More specifically, it is: two lasers in the end what the strengths and weaknesses? Fiber laser CO2 laser can replace it?

This seemingly simple problem, make it clear that is not necessarily easy.

We tried from many, many angles to provide users with comprehensive information and impartial advice from in order to receive the effect of clearing up doubts.

Laser (hereinafter referred to as fiber laser) fiber laser of wavelength 1.06 m is produced, CO2 laser produces laser light (hereinafter abbreviated as CO2 laser) wavelength of 10.6 m, are infrared light can be absorbed by the material, and applied industrial materials processing.

474(1)

Cutting is the most widely used industrial laser processing technology. For convenience, the paper launched discussions are based laser cutting, unless otherwise specified.

Two kinds of laser length the pros and cons

As a user, you seem to understand the respective fiber lasers and CO2 lasers bane. The so-called Achilles heel is the cutting of the blind spot. Avoid the Achilles heel (blind), and then compete competing short length, suitable for the needs of that one selected.

Fiber laser bane

Non-metallic fiber laser can not cut, including wood, plastic, leather, cotton and linen fabrics. If the workpiece material to be machined is exactly what non-metallic, the fiber laser can only lose, instead of none other than CO2 lasers.

Automotive interior parts are mostly non-metallic materials, high-precision robot + CO2 laser machining system, cutting its space surface, this laser beam machining system need to be addressed in the joint between the robot transmission problems.

Fiber laser can not cut with the coated surface of the material, such as ordinary stainless steel coated with anticorrosive coatings of special steel. There is not enough attention to this user, and the choice of fiber lasers had to be issued ordinary coating stainless steel cutting. If you want to use a dedicated fiber laser film, the cost is increased.

CO2 lasers bane

CO2 laser can not cut copper, including brass, copper. If you need to cut copper, fiber laser grid only enough.

For CO2 laser, a copper and a high reflective material, almost all the laser light is reflected without being absorbed; light reflected back into the laser, causing harm.

CO2 laser reflectivity of aluminum is higher. Install isolator back reflector, which can effectively protect the CO2 laser, which can be safely cut aluminum.

And from our cost cutting speed, piercing efficiency, quality and other aspects of cross-section, the bringing of two competing lasers to fight short length.

The cost

Here, in order to facilitate the comparison of the two lasers cost difference is calculated only the cost of electricity, supplies, medium gas composed of three parts, the cost of this three-part, they are different; manpower, depreciation, space, cutting gas for two kinds of lasers, the same cost, it does not count.

Two kinds of lasers are required to spend a huge amount of electricity. Power fiber laser – optical conversion efficiency of about 30%, CO2 laser is about 10%. In terms of 3000W laser, fiber laser power of about 10kW of electricity, and CO2 laser power of about 30kW. In price 1 yuan / kWh, accounting for 70% load meter, the costs were 7 yuan / hour, 21 yuan / hour.

Further, due to different efficiency, therefore, the heat generated by the laser two kinds of different specifications (cooling capacity) of water chillers require different. Power fiber lasers require water-cooled machine is 13kW, CO2 laser power required for water-cooled machine is 18kW. In price 1 yuan / kWh, accounting for 70% load meter, the cost was 9 yuan / hour, 12.8 yuan / hour.

In everyday use, the use of fiber laser cutting machine (hereinafter referred to as the fiber cutting machine) cost the materials: focusing mirror, ceramic bodies, nozzles, protective glass, etc., costs about 3 yuan / hour.

In addition, according to statistics four years, and beam expander laser module has its own life, resulting in about 4 yuan / hour, respectively, and 1 yuan / hour costs (special instructions, the smallest unit of ROFIN fiber laser is a semiconductor module to be replaced , cost about 1 yuan / hour).

Using CO2 laser cutting machine (hereinafter referred to as the CO2 cutting machine) cost the materials: focusing mirror, ceramic bodies, nozzles, mirrors, etc., cost about 2.5 yuan / hour.

Fiber laser medium without gas; CO2 gas lasers need to use the media to produce laser light, cost about 1 yuan / hour.

In addition, CO2 laser every 3,000 hours of routine inspection every 6000 hours for in-depth inspection, about 2 yuan / hour costs are incurred.

In summary, the use of fiber lasers cost about 24 yuan / hour, CO2 laser is about 38.3 yuan / hour, a difference of 14.3 yuan / hour. Use 10 hours per day, the daily cost difference of 143 yuan.

The difference between the two laser on the market saying the cost of, somewhat exaggerated.

Incidentally, fiber laser transmission medium is optical fiber, optical fiber beam enclosed in “to curve”, not subject to external environmental impacts. CO2 laser transmission medium is air, straight lines, by a mirror to change the transmission direction, susceptible to external environmental impacts, you may need to maintain the mirrors, thereby slightly increasing the cost.

Cutting speed

Cutting speed, piercing efficiency, quality, and so constitutes section laser cutting performance, evaluating laser (machines) comprehensive index.

Fiber laser cutting sheet has an advantage, in particular the thickness of 3mm or less, have obvious advantages, with respect to the CO2 laser, the maximum cutting speed ratios up to 4: 1; and 6mm thickness of two kinds of lasers are critical advantages interchangeable. Cutting thickness> 6mm plate, the fiber laser no advantage; with increasing thickness, CO2 fade advantage, but not significantly.

Overall, the cutting speed or fiber lasers have the advantage.

Piercing efficiency

Laser beam cutting the workpiece before the start, we need to penetrate the workpiece. Fiber laser perforation time was significantly longer than CO2.

Or to 3kW fiber lasers and CO2 lasers for example. For carbon steel having a thickness of 8mm, the latter is at least 1 second; when 10mm, which is at least two seconds; thickness increases, CO2 lasers advantages in terms of perforation increasingly significant.

With perforation 2000 times a day, every 3 seconds, count the time difference perforation, perforation of the day, the time difference is 6000 seconds, or about 1.7 hours.

CO2 laser perforation due to higher efficiency, reduced 1.7 hours per day use the machine time. Even with more conservative data included artificial (30 yuan / hour), depreciation of equipment (25 yuan / hour) and field (2 yuan / hour) expense, cost savings have (CO2 laser):

1.7 × (30 + 25 + 2 + 38.3) = 162 (yuan)

Section quality

Section quality usually refers roughness (finish), verticality.

The following cutting 3mm thick steel plate, fiber laser cutting section quality (roughness and vertical degrees) slightly worse than CO2. As the thickness increases the mass difference sectional increasingly apparent.

≥3mm thickness stainless steel, fiber laser cutting section was frosted, and CO2 was bright like.

16mm thick carbon steel, vertical cross-section of the optical fiber laser cutting far worse than CO2, the former is 0.4 ~ 0.5mm, the latter up to 0.1mm.

In addition, carbon fiber plate laser energy absorption rate, cutting holes (≤ aperture plate thickness), it could be a disadvantage, poor cut quality.

Incidentally, laser cutting precision regardless of what kind of laser and machine positioning accuracy, repeatability, consistency kerf width of about. Fiber laser cutting slits narrow, CO2 slit slightly wider. However, the width of the slit does not affect the accuracy of parts, because by cutting compensation function, you can offset the slit width.

Fiber lasers and CO2 lasers exactly what good

With these data, it is easy to arrive at a logical conclusion, in order to make a rational choice.

Generally speaking is not good fiber laser, it can not generally speaking is good CO2 laser. It should be analyzed based on a particular application, judgment.

No advantage. Cutting speed comparable with the CO2 laser. Section quality, the piercing efficiency was inferior to the CO2 laser.

There are advantages: cutting speed slightly faster than the fiber laser; good section quality; high piercing efficiency, the time can be reduced and more than offset the higher cost of fiber lasers.

We see, fiber lasers and CO2 lasers in the face of the needs of a particular application has its own strengths and weaknesses. Within the current and future period of time, fiber lasers and CO2 lasers can not replace each other, but only complementary coexistence. Radially polarized CO2 laser technology noteworthy progress, may narrow the gap in the fiber laser sheet cutting aspects.

Contact:

Company Name:WUHAN GN LASER EQUIPMENT MANUFACTURING CO., LTD.
Address:No.4, 7th part, private science and technology industrial park,quanli first road,economic and techn
Zip Code:430050
Telephone:+86-27-87318320/84658466
Fax:+86-27-83600135
Email:
service.vip.laser@hotmail.com

 

 

Laser Cutting and Engraving Machine for Advertising

Product Name: Laser Cutting and Engraving Machine for Advertising
Model Number: GN-D10060
Place of Origin: Hubei, China
Brand Name: GN LASER
Application: Laser cutting and engraving
Laser Type: CO2

Applicable Field
It is suitable for fabric clothing, leatherware, furniture, home textile, packing and pringting,
cloth toy, computer embroidery cutting, etc. Which the manufactures widely processing the
material’s cutting, hollowing and engraving.

Acrylic handicraft engraving&cutting

Double color boards laser engraving

Cardboard laser cutting

Equipment Feature
1.Adopting new sheet metal process design, smooth lines, appearance is more beautiful.
2.The overall upgrade laser control system, with more user-friendly operation an interface.
3.Increased the power function, avoided material waste when suddenly loss power.
4.Control system upgrade to handheld panel, with more user-friendly operation and more flexible control mode.

Technical Parameter
MODEL :  GN-D10060
LASER TYPE :  hermetic and detached CO2 laser tube
LASER WAVELENGTH :  10600nm
LASER POWER(STANDARD) :  65W
LASER POWER(OPTIONAL) :  80W/130W/150W
WORKING AREA :  1000mm*600mm
WORKING TABLE :  zinc and iron thicker strip working table
ENGRAVING SPEED :  0-1200mm/s
COMPATIBLE FILE FORMAT :  PLT AI DXF DST JPG BMP GIF PNG TGA TIF
COOLING MODE :  specialized constant-temperature chiller
POWER SUPPLY :  220V±10% 50 Hz /60 Hz
WHOLE POWER :  1.1KW

Contact Us

Contact:

Company Name:WUHAN GN LASER EQUIPMENT MANUFACTURING CO., LTD.
Address:No.4, 7th part, private science and technology industrial park,quanli first road,economic and techn
Zip Code:430050
Telephone:+86-27-87318320/84658466
Fax:+86-27-83600135
Email:
service.vip.laser@hotmail.com

Hand-Held Fiber Laser Marking Machine


Product Name: Hand-Held Fiber Laser Marking Machine
Model Number: GN-FS20
Place of Origin: Hubei, China
Brand Name: GN LASER
Application: Laser marking
Laser Type: Fiber

Applicable Field
Fabrication of metal parts, auto parts, hardware, artware, digital products parts, axletree, measuring implement,
communication product, sanitary ware, electronic components, building material, pipes, electrical machinery,
jewelry, precision machinery, glasses, clock and watch, plastic buttons, medical device, etc.
It is more suitable for the marking of product which requests for high accuracy, high speed and more depth.


Applicable Material
1. Metal material: Stainless steel, copper, iron, aluminum, carbon steel and alloy.
Such as mechanical components, metal parts, clock case, metal artware, MP3, case of cell phone,
frame of eye glasses, etc.
2. Metal oxidation material: Surface of metal oxide, metal phosphorization, metal electroplating.
Such as metal nameplate, hardware product, metal artware, case of USB flash disk, etc.
3. Laser marking of EP material
Such as electronic component packaging, terminal pillars, PCB, IC, etc.
4. ABS and other plastic material.
Such as marking serial number or logo for pipe and tubes, case of electric instruments, electronic products.
5. Ink and painting process
Such as keypad of cell phone, panel, commodity, printing product, etc.

Equipment Feature
1. It is hand-held laser source, compact size, can be embedded in production line.
2. Completely close and free-maintenance fixed optical system, operate as you like.
3. Light weight, small size, easy to carry, can work in different working places.
4. It can be equipped with rotary encoder optionally. By cooperating with the function of flying marking, it can realize
automatic online marking.
5. Adopting the third generation fiber laser source, the electronic-optic efficiency of pump light source after fiber
coupling is up to 80%.
Better beam quality, long lifetime. The life-span of laser source is 100,000 hours.
6. Air cooling, no consumable material, free-maintenance, saves electricity and energy(whole power is 500W),
lowest late-use cost.
7. No need intermedium, the marking is environmental, completely meet the standard of ROHS.
8. Adopting the most advanced marking control system with strong software function:
a.It can use SHX, TTF font library directly;
b.It can mark various graphic, character, text and one-dimensional, two-dimensional bar-code;
c.Supporting auto-encoding, marking of serial number, lot number, date, bar-code, two dimensional
code, skip number.
d.It is compatible with CorelDraw, AutoCAD, Photoshop.
e.It supports various general file format, such as PLT, DXF, AI, DST, BMP, JPG, etc.

Technical Parameter
MODEL : GN-FS20
LASER TYPE : fiber laser source
LASER-WAVELENGTH : 1064nm
LASER POWER(STANDARD) : 20W
LASER POWER(OPTIONAL) : 10W
MARKING AREA(STANDARD) : 100mm*100mm
MARKING AREA(OPTIONAL) : 70mm*70mm
MARKING DEPTH : ≤0.3mm
MARKING SPEED : ≤10000mm/s
POSITIONING SYSTEM : red-light pointer
COMPATIBLE FILE FORMAT : PLT、DXF、AI、DST、BMP、JPG、etc.
WORKING POWER SUPPLY : AC 220V±5% 50Hz(60Hz optional)
WHOLE POWER : 0.6KW
COOLING MODE : Air cooling

Contact:

Company Name:WUHAN GN LASER EQUIPMENT MANUFACTURING CO., LTD.
Address:No.4, 7th part, private science and technology industrial park,quanli first road,economic and techn
Zip Code:430050
Telephone:+86-27-87318320/84658466
Fax:+86-27-83600135
Email:
service.vip.laser@hotmail.com

Laser cutting machine for both sheet metal and tubes

Model:GN-TPF3015-500W
Laser type:Imported fiber laser source
Laser wave-length:1064nm
Laser power:500w
Cutting area:3000mm*1500mm(Length*Width)
Max cutting thickness:6mm
Max tube wall cutting thickness:4mm
Tube cutting diameter:10-100mm
Max tube cutting length:3000mm
Cutting accuracy:≤0.08mm
Min.cutting kerf:0.10mm
Power supply:380V±5% 50Hz
Main power:4.5kw

Applicable Material
Stainless steel, carbon steel, alloy steel, spring steel, aluminum, aluminum alloy, galvanized steel,
cincalumzalutite, copper, silver, gold, titanium and other metal sheet, tubes and pipes.

Equipment Feature
Able to cut for holes of cylinder intersection (line) in different directions and diameter, meeting the requirement about eccentric/non-eccentric vertical intersection of main tube axis and auxiliary tube axis.Able to cut square tubes and engrave any image on wall of column tube.

Contact:

Company Name:WUHAN GN LASER EQUIPMENT MANUFACTURING CO., LTD.
Address:No.4, 7th part, private science and technology industrial park,quanli first road,economic and techn
Zip Code:430050
Telephone:+86-27-87318320/84658466
Fax:+86-27-83600135
Email:
service.vip.laser@hotmail.com

CTF6000-2000W Tube laser cutting machine

MODEL :  GN-CTF6000-2000W
LASER TYPE :  Imported fiber laser source
LASER WAVE-LENGTH :  1064nm
LASER POWER : 2000W
CUTTING AREA:  6000mm
MAX TUBE CUTTING DIAMETER:160mm
MAX TUBE CUTTING LENGTH:6000mm
CUTTING ACCURACY :  ≤0.08mm
MIN.CUTTING KERF :  0.10mm
FOCUSING SYSTEM :  non-contact automatic tracking system
COOLING MODE :  water cooling
POWER SUPPLY :  AC 380V±5% 50Hz(60Hz optional)
MAIN POWER :  35KW
Applicable Field
Widely used for tubes and pipes processing, advertising trademark, advertising character,
high/low voltage electrical cabinet, mechanism parts, kitchenware, cars, mechanical, metal craftwork, saw blade,
electronic parts, eyeglasses, spring, circuit board, kettle, medical microelectronics, hard ware,
knives tool, measurement, instrument, etc.

Applicable Material
Stainless steel, carbon steel, alloy steel, spring steel, aluminum, aluminum alloy, galvanized steel,
cincalumzalutite, copper, silver, gold, titanium and other metal

Contact:

Company Name:WUHAN GN LASER EQUIPMENT MANUFACTURING CO., LTD.
Address:No.4, 7th part, private science and technology industrial park,quanli first road,economic and techn
Zip Code:430050
Telephone:+86-27-87318320/84658466
Fax:+86-27-83600135
Email:
service.vip.laser@hotmail.com

GN-CFD3015 Fiber laser cutting machine with exchangeable pallet

Technical Parameter

Model: GN-CFD3015
Laser type: imported fiber laser
Laser wave-length:1070nm
Laser power: 2000W
Cutting area:3000mm*1500mm
Max cutting thickness:16mm
Cutting accuracy:≤0.03mm
Min cutting kerf:0.10mm
Cooling model: water cooling
Power supply:AC 380V±5% 50Hz
Main power:30KW

Equipment Feature

1.World top rank SPI fiber laser source equipped
2.Advance double driving system structure, Dual driving force from high precision driving method. Top standard gear, rack and guide rail, no need maintenance, high speed and efficiency.
3.Components from world famous suppliers.
4.Environmental working medium, screen out radiation harm. Ensure green and safer working circumstance.
5.Quality assurance, long warranty. various warranty plan for you to choose.
6.Professional and fast respond service mechanism, door to door after-sale service, free 24/7 online technical support and before-sale technical consultation.
7.High laser cutting speed, high laser cutting accuracy, laser cutting machine

Applicable Field

Widely used for metal sheet processing, advertising trademark, advertising character,
high/low voltage electrical cabinet, mechanism parts, kitchenware, cars, mechanical, metal craftwork, saw blade,
electronic parts, eyeglasses, spring, circuit board, kettle, medical microelectronics, hard ware,
knives tool, measurement, instrument, etc.

Contact:

Company Name:WUHAN GN LASER EQUIPMENT MANUFACTURING CO., LTD.
Address:No.4, 7th part, private science and technology industrial park,quanli first road,economic and techn
Zip Code:430050
Telephone:+86-27-87318320/84658466
Fax:+86-27-83600135
Email:
service.vip.laser@hotmail.com

GN-CFD3015-B Super speed fiber laser cutting machine

Technical Parameter
Model: GN-CFD3015-B
Laser type: Disk fiber laser
Laser wave-length:1070nm
Laser power: 3000W
Cutting area:3000mm*1500mm
Max cutting thickness:20mm
Cutting accuracy:≤0.03mm
Min cutting kerf:0.10mm
Cooling model: water cooling
Power supply:AC 380V±5% 50Hz
Main power:35KW
Applicable

Equipment Feature
1.World top trumpf disk fiber laser source equipped
2.Advance double driving system structure, Dual driving force from high precision driving method. Top standard gear, rack and guide rail, no need maintenance, high speed and efficiency.
3.Components from world famous suppliers, Panasonic,Yaskawa,YYC,Simens,Precite,etc.
4.Environmental working medium, screen out radiation harm. Ensure green and safer working circumstance.
5.Quality assurance, long warranty. various warranty plan for you to choose.
6.Professional and fast respond service mechanism, door to door after-sale service, free 24/7 online technical support and before-sale technical consultation.

Applicable Field
Widely used for metal sheet processing, advertising trademark, advertising character,
high/low voltage electrical cabinet, mechanism parts, kitchenware, cars, mechanical, metal craftwork, saw blade,
electronic parts, eyeglasses, spring, circuit board, kettle, medical microelectronics, hard ware,
knives tool, measurement, instrument, etc.

CE ISO Certificated, Machine and Service Quality Double Assurance!

Contact:

Company Name:WUHAN GN LASER EQUIPMENT MANUFACTURING CO., LTD.
Address:No.4, 7th part, private science and technology industrial park,quanli first road,economic and techn
Zip Code:430050
Telephone:+86-27-87318320/84658466
Fax:+86-27-83600135
Email:
service.vip.laser@hotmail.com

750W fiber laser cutting machine for 8mm steel metal cutting GN-NCF3015-750

Technical Parameter
Model: GN-NCF3015
Laser type: imported fiber laser
Laser wave-length:1070nm
Laser power: 750W
Cutting area: 3000mm*1500mm
Max cutting thickness: 8mm
Cutting accuracy: ≤0.03mm
Min cutting kerf: 0.10mm
Cooling model: water cooling
Power supply: AC 380V±5% 50Hz
Main power: 4KW

Equipment Feature
1. top rank RAYCUS fiber laser source equipped
2.Advance double driving system structure, Dual driving force from high precision driving method. Top standard gear, rack and guide rail, no need maintenance, high speed and efficiency.
3.Components from world famous suppliers, Panasonic,Yaskawa,YYC,Simens,Precite,etc.
4.Environmental working medium, screen out radiation harm. Ensure green and safer working circumstance.
5.Quality assurance, long warranty. various warranty plan for you to choose.
6.Professional and fast respond service mechanism, door to door after-sale service, free 24/7 online technical support and before-sale technical consultation.

Applicable Field
Widely used for metal sheet processing, advertising trademark, advertising character,
high/low voltage electrical cabinet, mechanism parts, kitchenware, cars, mechanical, metal craftwork, saw blade,
electronic parts, eyeglasses, spring, circuit board, kettle, medical microelectronics, hard ware,
knives tool, measurement, instrument, etc.

CE ISO Certificated, Machine and Service Quality Double Assurance!

Contact:

Company Name:WUHAN GN LASER EQUIPMENT MANUFACTURING CO., LTD.
Address:No.4, 7th part, private science and technology industrial park,quanli first road,economic and techn
Zip Code:430050
Telephone:+86-27-87318320/84658466
Fax:+86-27-83600135
Email:
service.vip.laser@hotmail.com

YAG Laser Cutting Machine GN-CY3015-850W

Technical Parmeter

MODEL : GN-CY3015-850W

LASER TYPE : Nd:YAG

LASER WARE-LENGTH : 1064nm

CUTTING AREA : 3000mm*1500mm(length*width)

MAX CUTTING THICKNESS : 12mm(depend on material)

CUTTING ACCURACY : ≤0.08mm

MIN.CUTTING KERF : 0.15mm

FOCUSING SYSTEM : non-contact automatic tracking system

POWER SUPPLY : AC380V ±5% 50Hz(60 Hz optional)

MAIN POWER : 21KW

Applicable Field

Widely used for metalsheet processing, advertising trademark, advertising character, high/low voltage electrical cabinet, mechanism parts, kitchenware, cars, mechanical, metal craftwork, saw blade,electronic parts, eyeglasses, spring, circuit board, kettle, medical microelectronics, hard ware, knives tool, measurement, instrument, etc.

Applicable Material

Stainless steel, carbon steel, alloy steel, spring steel, aluminum, aluminum alloy, galvanized sheet, cincalumzalutite, pickling plate, copper, silver, gold, titanium and other metal sheet, pipes and tubes.

Contact:

Company Name:WUHAN GN LASER EQUIPMENT MANUFACTURING CO., LTD.
Address:No.4, 7th part, private science and technology industrial park,quanli first road,economic and techn
Zip Code:430050
Telephone:+86-27-87318320/84658466
Fax:+86-27-83600135
Email:
service.vip.laser@hotmail.com