Do You Know The Function And Choice For SMT Nozzle

Generally engaged in the SMT industry are know SMT nozzle is a key role of SMT machine components, with it to absorb and place SMT components, SMT nozzle on the market are various, according to the material divided into tungsten steel, diamond steel, ceramics, plastic steel, plastic, aluminum, iron, etc.. According to the shape of the round hole, square hole, V - shaped, according to the size is divided into a variety of. Now I will share with you the SMT nozzle and how to choose.

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I. The function of SMT nozzle of the placement machine
The SMT nozzle is not only the key part of the SMT to attach and put the absorbed components, but also the background of the camera of the optical vision system when it takes pictures. It mainly USES vacuum adsorption to absorb the components, and USES air blowing to put the absorbed components on the coordinate position of the circuit board.
When the placement machine suction element, to achieve the ideal situation must ensure that the center of the element, the center of the suction nozzle and the spatial center of the obtained image should be coincident, and the adjustment of the optical vision system is actually to compensate for the deviation caused by this non-coincidence in the actual work.
Different mounting elements require different suction nozzles. Almost every suction nozzle has a reflected background, which is mainly to have a good background during image uptake, so as to ensure the accurate highlight of the target information during image processing. When the suction nozzle is extracted from the image, the suction nozzle is used as the background, so that the image contrast of components can be enhanced and more clearly visible.

II. SMT nozzle selection

1- Select the material of SMT nozzle:

A. Tungsten steel nozzle: tungsten steel nozzle strong, durable, but easy to white, trouble friends, or SMT new people can choose tungsten steel nozzle, white with an oily pen, can continue to use.

If you want to learn more, please visit our website KF-SMT.

B. Ceramic suction nozzle: Ceramic suction nozzle will never be white, but it is very fragile and easy to break. Careful use can avoid or reduce the occurrence of fracture.

C. Diamond steel suction nozzle: strong, easy to use, never white, but very expensive, cost-effective.

D. Glue head suction nozzle: when the surface of the material is not smooth or sticky, it is suitable to choose the glue head suction nozzle, but the life of the glue head suction nozzle is not long. It is recommended to buy more glue head suction nozzle to spare, when the mouth is worn, you can directly change the glue head.

2-Select the size of SMT nozzle of the placement machine:
Standard specifications of the material, nozzle specifications are basically fixed, take Samsung SM as an example, material corresponding to CN065 suction nozzle, material corresponding to CN040 suction nozzle and so on, when some material is not big or small, strange shape, you need to customize the suction nozzle.

3-Select through the suction nozzle shape of the placement machine:
SMT nozzle shape has square hole, circular pass, V groove and so on. Custom-made suction nozzle, generally according to the shape of the material, select the flat suction point, some make elongated suction nozzle, stretch feed groove plane to absorb, some according to the edge of the material, made back font, some ends with a plane, uneven in the middle, you want to build a bridge. Some materials are sticky, it is not good to put materials, to the wall of the suction nozzle to cut some grooves, or make plastic head.

SMT (Surface Mount Technology) nozzles are essential components in automated pick-and-place equipment, primarily responsible for retrieving surface mount components from feeders and placing them onto PCB boards. The structural principle of the nozzle is as follows:

1. Inflation Principle: Nozzles typically employ an inflation principle, generating or applying negative pressure inside the nozzle to suction the surface mount components. The interior of the nozzle usually contains a cavity connected to an air source and a vacuum system. When suctioning components is required, negative pressure is applied to the cavity, creating a vacuum environment within the nozzle.
2. Suction Cup Structure: The end of the nozzle typically features a suction cup with multiple small holes. When negative pressure is applied inside the nozzle cavity, air is suctioned through the small holes in the suction cup, generating negative pressure suction force. The suction cup is usually made of flexible material to adapt to different sizes and shapes of components.
3. Contact Principle: When the suction cup of the nozzle contacts the surface of the surface mount component, a seal is formed between the suction cup and the component due to the negative pressure, firmly adhering the component to the nozzle. During this process, the contact force between the nozzle and the component needs to be just right to maintain sufficient adhesion force while avoiding damage to the component.

It is worth noting that the structural principle of the nozzle may vary depending on the type of automated pick-and-place equipment and the type of nozzle. The design of the nozzle structure is also optimized based on the size, shape of the components, and the required adhesion force.

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