what is the method or connecting of tinning of terminal blocks?
2021-12-20
The method and connecting of tinning of terminal blocks
Terminal blocks are common components for connecting circuits. It is mainly used for electrical connection and signal transmission between equipment and components, components and cabinets, and systems and subsystems, and tries to prevent signal distortion and energy loss between systems. Terminal blocks are widely used in computer, telecommunications, network communication, industrial electronics, transportation, aerospace, medical equipment and automobile industry.
1. The punctured connection of the connecting terminal is also called insulation replacement connection. In the connection process, the cable does not need to peel off the insulation layer. The front end of the U-shaped contact spring of the connecting terminal is punctured into the insulation layer, so that the conductor of the cable slides into the groove of the contact spring and is clamped, so as to form a close electrical connection between the conductor of the cable and the spring of the connecting terminal.
2. Wiring terminal winding is to directly wind the conductor on the winding column of angular contact. During winding, the conductor is wound under the control of tension, pressed and fixed at the corner of the winding column of the contact to form an air tight contact. There are several requirements for the wound conductor: the nominal value of the wire diameter shall be within the range of 0.25mm ~ 1.0mm. When the wire diameter is not greater than 0.5mm, the elongation of the wire shall not be less than 15%. When the wire diameter is greater than 0.5mm, the elongation of the wire material shall not be less than 20%. The winding tools include a winding gun and a fixed winding machine.
3. Terminal crimping is a technology that compresses and moves metal within a specified range and connects wires to contact pairs. Good crimping connection can produce metal fusion flow, making the conductor and contact symmetrically deformed to the material. This connection is similar to cold welding connection, which can obtain better mechanical strength and electrical continuity, and can withstand harsh environmental conditions. At present, most people think that the correct crimping connection is better than welding, especially in the case of high current.
4. Terminal welding usually refers to tin welding. The formation of metal continuity between solder and the surface to be welded is very important for welding connection. Therefore, solderability is important for connecting terminals. Tin alloy, silver and gold are common coatings for connecting terminals. The common welding ends of reed contact pairs are welding plate, stamping welding plate and notch welding plate. The common welding end of the pinhole contact pair is drilled with a circular arc notch.
At present, in China's wiring terminal market, with the continuous warming of mobile communication and Internet markets, the connected terminals also show a good trend of continuous rise. Today's development trend of electronic information has created a broad space for the development of the connector industry. With the continuous transfer of manufacturing industries such as household appliances, electronic information products, automobiles and mobile phones to China, China has become the world's largest manufacturer of household appliances and information products, and the output of consumer electronics, network design and communication terminal products has increased rapidly. Therefore, the demand for intermediate products such as terminals is growing rapidly. At present, China has become a rapidly growing terminal market in the world. With the higher and higher automation level of industry, the industrial control requirements are more and more strict and accurate, and the use of wiring terminals is increasing gradually.
All connector terminals shall be surface treated, generally refers to electroplating. There are two main reasons for electroplating connector terminals: one is to protect the base material of terminal spring from corrosion; The second is to optimize the performance of the terminal surface, establish and maintain the contact interface between the terminals, especially the film control. In other words, it makes metal to metal contact easier.
There are three tinning methods for connector terminals: pre tinning, pre coating and electroplating. Tin is relatively soft, relatively cheap, easy to weld, and the coating thickness is 2-12 μ m。 Brass or bronze can be tinned at 110 degrees and steel can be tinned at 190 degrees. Gold plating on connector terminals is a better electroplating method for existing electrical contacts. Soft, insoluble in acid, with good conducti
vity. The gold plating thickness is usually 0.4-3.5 μ m
Terminal blocks are common components for connecting circuits. It is mainly used for electrical connection and signal transmission between equipment and components, components and cabinets, and systems and subsystems, and tries to prevent signal distortion and energy loss between systems. Terminal blocks are widely used in computer, telecommunications, network communication, industrial electronics, transportation, aerospace, medical equipment and automobile industry.
1. The punctured connection of the connecting terminal is also called insulation replacement connection. In the connection process, the cable does not need to peel off the insulation layer. The front end of the U-shaped contact spring of the connecting terminal is punctured into the insulation layer, so that the conductor of the cable slides into the groove of the contact spring and is clamped, so as to form a close electrical connection between the conductor of the cable and the spring of the connecting terminal.
2. Wiring terminal winding is to directly wind the conductor on the winding column of angular contact. During winding, the conductor is wound under the control of tension, pressed and fixed at the corner of the winding column of the contact to form an air tight contact. There are several requirements for the wound conductor: the nominal value of the wire diameter shall be within the range of 0.25mm ~ 1.0mm. When the wire diameter is not greater than 0.5mm, the elongation of the wire shall not be less than 15%. When the wire diameter is greater than 0.5mm, the elongation of the wire material shall not be less than 20%. The winding tools include a winding gun and a fixed winding machine.
3. Terminal crimping is a technology that compresses and moves metal within a specified range and connects wires to contact pairs. Good crimping connection can produce metal fusion flow, making the conductor and contact symmetrically deformed to the material. This connection is similar to cold welding connection, which can obtain better mechanical strength and electrical continuity, and can withstand harsh environmental conditions. At present, most people think that the correct crimping connection is better than welding, especially in the case of high current.
4. Terminal welding usually refers to tin welding. The formation of metal continuity between solder and the surface to be welded is very important for welding connection. Therefore, solderability is important for connecting terminals. Tin alloy, silver and gold are common coatings for connecting terminals. The common welding ends of reed contact pairs are welding plate, stamping welding plate and notch welding plate. The common welding end of the pinhole contact pair is drilled with a circular arc notch.
At present, in China's wiring terminal market, with the continuous warming of mobile communication and Internet markets, the connected terminals also show a good trend of continuous rise. Today's development trend of electronic information has created a broad space for the development of the connector industry. With the continuous transfer of manufacturing industries such as household appliances, electronic information products, automobiles and mobile phones to China, China has become the world's largest manufacturer of household appliances and information products, and the output of consumer electronics, network design and communication terminal products has increased rapidly. Therefore, the demand for intermediate products such as terminals is growing rapidly. At present, China has become a rapidly growing terminal market in the world. With the higher and higher automation level of industry, the industrial control requirements are more and more strict and accurate, and the use of wiring terminals is increasing gradually.
All connector terminals shall be surface treated, generally refers to electroplating. There are two main reasons for electroplating connector terminals: one is to protect the base material of terminal spring from corrosion; The second is to optimize the performance of the terminal surface, establish and maintain the contact interface between the terminals, especially the film control. In other words, it makes metal to metal contact easier.
There are three tinning methods for connector terminals: pre tinning, pre coating and electroplating. Tin is relatively soft, relatively cheap, easy to weld, and the coating thickness is 2-12 μ m。 Brass or bronze can be tinned at 110 degrees and steel can be tinned at 190 degrees. Gold plating on connector terminals is a better electroplating method for existing electrical contacts. Soft, insoluble in acid, with good conducti
vity. The gold plating thickness is usually 0.4-3.5 μ m
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