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Standby operation description
The main parameters of the hot press equipment are: temperature, time and pressure. If these three factors are controlled, the welding products will be stable. The products welded by hot press are generally PCB / FPC / FFC, which are connected with each other by solder to achieve functions.
For welding products, it is very important to set the above parameters accurately. A good solder joint can make the solder fully weld two surfaces and fuse the tin on the surfaces of two parts. Only when the above parameters are effectively cooperated can a good product be welded.
FPC is composed of two layers of polyimide and copper platinum. The operating temperature of FPC ranges from 130 to 200 degrees It can taste the short-time welding temperature up to 300 degrees. When PCB and FPC are welded, it will bring heat dissipation effect to the indenter (FPC and PCB will absorb heat. When the indenter is pressed down, the air convection between the data to be welded and the indenter will cause heat dissipation of the indenter). In addition, the thickness of FPC is between 0.02 and 0.12, so the loss of 50 to 80 degrees may occur when reaching the welding surface. Therefore, the temperature of loss should be added when setting the temperature (solder melting point plus loss temperature)
Parameter value and its setting scale:
1、 Setting of heating speed.
The heating speed range has 8 gears (gear 1 to gear 8). The heating speed of gear 1 is fast and that of gear 8 is slow. Its setting is related to the width of the indenter. The slow heating gear (i.e. gears 6, 7 and 8) is used for the narrow head (10mm), and the fast heating gear (i.e. gears 1, 2 and 3) is used for the wide head (e.g. 80mm).
2、 Temperature and time setting: the temperature setting is divided into three stages: preheating, welding and cooling.
1. Setting of the first preheating temperature: make the solder point of the solder pad reach the melting point. The setting value is about the melting point temperature of tin. The lead-free temperature is about 230 degrees. The lead-free temperature is about 180 degrees. The time is set at 2 to 4 seconds. The advantages of preheating setting are:
1) It takes a few seconds for the temperature of the indenter to rise to the welding temperature (including the set time of holding the temperature). During this time, the flux is activated and the oxide layer is removed to improve the melting tin Preheating is generally used for excessive heat dissipation of products, or when soft substrates (such as ceramics) are applied, heating is required in a more controlled way to avoid cracking
2) During the second heating stage, the tin of the solder pad can move smoothly Otherwise, during the second heating stage, the pressure head suddenly rises to the melting temperature of tin, causing the solder on the solder pad to melt suddenly under pressure, while the temperature at both ends of the solder pad is low, making the tin unable to move back and forth, resulting in left-right movement and short circuit
2. Setting of the heating temperature of the second stage: the FPC and PCB are completely integrated, and the setting value depends on the raw materials to be welded. Generally, the temperature with lead is about 230 to 320 degrees. The temperature without lead is about 280 to 350 degrees. Due to different products and different sizes of indenters, the heat dissipation speed is different Set the temperature according to the heat dissipation
Note: when the electrodeposited copper of FPC is less than 0.03mm, the temperature of the two sections should not be set too high. It should be at the temperature at which the tin is completely melted. If the temperature is too high, the temperature transmitted to the welding surface through FPC will also be too high, resulting in strong mobility of tin Simple formation of short circuit and tin bead. And the product will change color due to high temperature. Setting the temperature too low will cause snowflake short circuit
The following is a reference value:
The first stage temperature setting scale of lead-free products: 230 to 280 degrees; the second stage temperature setting scale: 280 to 350 degrees
The temperature setting scale of the first stage of lead products: 200 to 230 degrees; the temperature setting scale of the second stage: 230 to 320 degrees
3. Cooling temperature setting of the third stage. The setting is to allow the two welding surfaces to be sufficiently cooled to condense. Avoid that after the indenter has welded the product, the solder joint will rise without condensation. At this moment, FPC will rise with the indenter to form desoldering. If the cooling temperature is set too low, the production power will be reduced. The temperature can be set at about 180 degrees
3、 Pressure setting
The general setting scale is 0.08 to 0.14mp Lower than this set scale, the cylinder may rise and fall slowly, or the welding is not solid and the welding is poor. If the pressure is too high, it is easy to produce short circuit of tin beads, which will damage FPC and PCB.
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[old brand of board splitting machine, yushunli is the first to be promoted] "yushunli board splitting machine" Suzhou yushunli Kunshan Dongguan Chang'an yushunli automation equipment Co., Ltd. specializes in developing milling cutter type board splitting machine, PCBA router, LED board splitting machine, light bar board splitting machine, Punch Board splitting machine, FPC punch board splitting machine, PCB board splitting machine, PCB circuit board splitting machine, curve board splitting machine, pneumatic board splitting machine, circuit board splitting machine, PCB cutting machine, PCB Gong board machine, aluminum substrate board splitting machine, walking knife board splitting machine, Automatic plate splitting machine, curve plate splitting machine, etc. The equipment is mainly used in various soft and hard PCB boards, FR4 / fr6 PCB, soft FPC, LED light strip, LED light strip, aluminum substrate, copper substrate stamping and splitting machine, etc. of mobile phone tablet and other communication digital electronics, household appliances, LED lighting, security electronics and other related electronic industries.
Suzhou yushunli Electronics Co., Ltd. South China address: (Headquarters)
Address: No. 10, Shanquan Road, yongtou village, Dongguan City, Guangdong Province
Tel: 0769-88087410
Ms. Liu: 13862072520
East China address: Address: No. 1068, Jinyang East Road, Kunshan City, Suzhou City, Jiangsu Province (Guorui Industrial Park)
Tel: 0512-62751429
Mr. Cao: 13450659407
Email / mail: seles@hk-yush.com
Business scope: laser substrate splitting machine, full-automatic milling cutter splitting machine, online PCB router machine, PCB, FPC, substrate, copper substrate, aluminum substrate cutting and splitting die, stamping splitting machine, splitting machine, non-standard automatic customized full-automatic MCPCB splitting machine # font automatic splitting machine FPC laser splitting equipment light bar splitting machine FPC splitting machine PCB board splitting machine V cut blanking machine punch splitting machine, substrate pulse welding machine, substrate wiring welding machine, Substrate optical device module hot press
