How to package and weld the four foot toggle switch? Let's give you details below.
Four foot toggle switch refers to the toggle switch with four welding feet, which is connected with the circuit board through the welding feet. Four foot toggle switch is a very common toggle switch. It looks like four feet, but actually it is only a switch. Generally, the upper and lower are switches, and the left and right are straight. Two feet can be diagonally welded when welding on the circuit board.
Package of four foot toggle switch:
Four foot toggle switch
A four foot toggle switch, how to draw a key package in pads. Because usually, pad components and package pins must correspond. If it does not correspond, first build PCB package, then CAE package, then part. In the process of part, first add PCB, then CAE, then there will be unused pins. Define all unused pins as signal pins, and operate in the tab of part attribute.
Welding of four foot toggle switch:
Four foot toggle switch can be divided into patch four foot toggle switch and plug-in four foot toggle switch according to the direction of welding foot. The direction of the welding foot is perpendicular to the main body, which is the four foot toggle switch of the chip, so that it is convenient to use the machine automatic welding on the surface of the circuit board. The direction of the welding pin is parallel to the main body of the plug-in four pin toggle switch. This welding pin needs to pass through the circuit board and be welded on the back of the circuit board, so that the combination of the device and the circuit board will be more solid.
Here are some welding methods of toggle switch:
1. Manual welding one by one, the advantage is that it can accurately grasp the welding of each component, and the disadvantage is that it is too time-consuming and laborious.
2. The wave soldering of pin has the advantages of low price, time-saving and labor-saving. Disadvantages: as the current components become smaller and the PCB is more and more dense, the possibility of bridging and short circuit between solder joints is also increased.
3. The advantage of reflow soldering is that the temperature is easy to control, oxidation can be avoided in the welding process, and the manufacturing cost is easier to control. The disadvantage is that solder edge collapse also occurs in the process of welding heating, which occurs in preheating and main heating. When the preheating temperature is in the range of dozens to 100, the solvent, as one of the components of solder, will reduce the viscosity and flow out. If the flow out tends to be strong, solder particles will be extruded out of the gold particles outside the welding area at the same time. If it cannot return during melting In the welding area, solder balls will be formed.