With the rapid development of the international electronics industry, the economy pick up, reflow soldering equipment as a surface mount soldering equipment domestic brands become the main force quickly occupy the international market, the domestic models to cost-effective advantage. Reflow development in recent years to its peak, appearing on the market low-cost low-quality reflow soldering. Electronics stage lighting company manufacturers in the purchase of reflow, the price gap is too far away I do not know where to start, I hope below can give you some inspiration.
How to choose a good reflow:
Reflow quality and has a very close relationship, and has the following main parameters affecting the quality of reflow:
A temperature control accuracy of soil 1 ° C (theoretical value):
Affect the temperature control accuracy and reflow heating with the heating mode of heat transfer:
a: heating wire heating element (usually imported nickel-chromium wire wound heating element), such fever general exchange rate is relatively high, long life
b: infrared tube heating element (infrared heater) stage lighting company imported materials, such heating element radiation, good uniformity, but the color temperature difference and produce mainly used for thermal compensation area, does not apply to the welding zone
c: heating tube heating element, such heat pipe heat efficiency is low, if not through the hot air, poor uniformity of heating surface (typically using less)
Heated heat transfer mode: full of hot air circulating (good) and hot air circulation + infrared composite (good) and infrared formula (poor)
Transmission with a lateral temperature requirements of the soil below 5 ° C, it would be difficult to ensure the welding quality.
High-quality reflow can generally be controlled at the soil 2 ° C / the soil 3 ° C (MCR series and ROHS Series)
Belt width to meet the requirements of maximum PCB stage lighting company size.
The PCB the 200MM network with application selection 300MM, according to the on your PCB choice width: general: 300 350 400 450 500MM select
The larger the width of the reflow power will be greater, so choose the right is the most important
4 The longer the length of the heating zone, the more the number of heating zones, the more easy to adjust and control the temperature curve. The general small batch select 5-6 zone, the reflow oven that is able to meet the requirements of the heating zone length of about 1.8m. In addition, the upper and lower heater should be independent of temperature control, in order to adjust and control the temperature curve.
Standard lead-free production we usually 8 temperature zones, according to different production requirements can be divided into S Series M Series the MCR series ROHS series, in terms of control have instrumented touch-type (optional) computer-based control systems: computer systems with Siemens systems must test its computer crashes or removed, will affect production, the IPC system board versatility bad, do not have the storage function, select the computer reflow Once the computer system will not be able to use equipment the low cost of such systems, the procurement of such models is not recommended.
(5) The maximum heating temperature is generally 300 to 350 ° C, considering the lead-free solder or metal substrate should be chosen above 350 ℃.
Different reflow insulation properties, low-end products are generally insufficient insulation, the maximum temperature is usually less than 300 degrees, the general requirements of the design temperature can reach more than 300 degrees mid-range reflow design over more than 320-350 if the radiator welding Reflow 400 degrees
Conveyor belt running smooth belt vibrations will cause the shift, suspension bridge, cold welding and other welding defects.
Middle and low reflow, the transmission mechanism is relatively simple, there will be a little vibration, the force front MCR ROHS series high stability synchronization device generally can solve the above problem.