Production Process
1.
Making filament light bulbs
2.
Cutting Glass tube
After the glass tube is cut to length, an exhaust tube must be attached to the top. First the top of the tube is heated using gas/oxygen fires. A tungsten carbide wheel folds the softened glass over to form a dome shape containing a small hole.
3.
making the Mount
First, the bridge is made by embedding preformed tungsten wires in a small cylindrical quartz rod. The filament is welded to these support wires and welded to the outerlead assembly consisting of the molybdenum sealing foils and outerleads.
4.
Bridge the tungsten wire into cyclindrical quartz rod & Press Sealing
The mount is inserted into the bulb and both parts held securely. The bottom portion of the bulb is then heated to around 3,272°F (1,800°C) using gas/oxygen burners to soften the quartz. Stainless steel press pads, operating at pressures of 20-60 psi, press the quartz to the molybdenum foils forming the hermetic seal. During this operation, the bulb is being flushed with an inert gas (nitrogen or argon) to remove the air and prevent the mount from oxidizing. The outerleads protrude from the end of the press and provide a means to electrically connect the lamp to the lamp base.
5.
Evacuating and filling the pressed bulb
The pressed bulb is filled with the halogen gas on the exhaust machine. This machine employs vacuum pumps to evacuate the air from the bulb and a filling system to introduce the halogen gas mixture into the bulb through the exhaust tube. The high internal lamp pressure is achieved by first filling the lamp above atmospheric pressure and then dipping the bulb into liquid nitrogen (-170 °C) which cools and condenses the fill gas below atmospheric pressure. Gas/oxygen fires then melt the exhaust tube at the top of the bulb forming the tip and trapping the gas in the bulb. The gas expands as it warms to the ambient temperature and thus results in a pressurized lamp.
6.
capsule buring and focusing
After the filling process, the lamps are tested for leaks by placing them onto a rotary machine
7.
Capsule Buring # Aging after 72 hours
A random sample is usually taken though some lamps are 100% tested. After the filling process, the lamps are tested for leaks by placing them onto a rotary machine and lighting them for a few minutes. If there is a major leak, the lamp will turn a white yellow color. If there are any major mechanical defects, the lamp will usually arc out.
8.
Assembly base and capsule
The base fixed to the jig model are controlled by the vision system information entered to control the movement of the servo motor x,y and z axis unit, and the filament portion of the bulb accurately matches the set value before completing with laser welding. The assembled product is moved to the next process by the conveyor system.
9.
Top- coating & marking
The top-coating is made on the surface of the glass tube end of the bulb to inhibit the light of the bulb illuminated from the vehicle’s headlamps directly forward. The product Then the products are moved to marking, which is completed by marking [brand name, part number, specification, date of manufacture, origin, and other customer requirements] on the surface of the BASE using an inkjet printer or laster according to the input value.
10.
100% vision #the final inspection
A random sample from each lot is also tested to make sure all specifications (watts, temperature, light output, and life) are met. It applies the most similar environmental conditions to the facility to conduct the lighting test.The examiner will visually screen the appearance. These efforts are meet our customer satisfaction in order to prevent the leakage of even one single defect out of a million.
11.
Coating capsule
Finished product without top coating, can coating on surface of glass to change the outlooking color and lighting color. And coating material is imported form Korea. The coating color we could choose dark blue、yellow、golden and so on. We could meet all different meet from our customers.
