In the actual SMT placement scenario, there may be 200-300 chips on a circuit board. In this case, 4 or even 6 placement nozzles are needed, but your placement machine has only 2 heads, so how to implement placement?
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The common approach is to divide the placement process into two or three parts, each handling a subset of components. This involves running the board through the pick-and-place machine multiple times to sequentially pick and place the components.
For example,
In the first part, the machine pick and place the first subset of components with Juki nozzle 502 and 503.
In the second part, the machine pick and place the second subset of components with Juki Nozzle 504 and 505 or 506.
Repeat if necessary, continue with additional passes until all components are placed on the circuit board. Each pass will address a portion of the components until the entire board is populated.
In the realm of Surface Mount Technology (SMT), achieving efficiency and flexibility in component placement is paramount. In order to improve pick and place efficiency, please optimize the programming to minimize the number of passes. One strategy to optimize this process involves the dynamic and flexible utilization of SMT nozzles, allowing for versatile handling of components with varying sizes and form factors.
Nozzle Selection:
To enhance flexibility, consider a versatile approach to nozzle selection. For instance, use nozzle 503 or 504 for components like resistors or SOT23 packages, where the component size is within the capacity of these nozzles.
For larger components such as resistors, opt for nozzle 504 or 505. Similarly, for handling TQFP components, choose nozzle 506 or 507. The key is ensuring that the component size is larger than the diameter of the selected nozzle.
Embrace a pragmatic approach by experimenting with different nozzles for components falling within the acceptable size range. If a nozzle can successfully pick up and place a component without issues, it's worth considering for your application.
While flexibility is crucial, it should not compromise precision. After placing components using a particular nozzle, assess the precision of the placement. If the accuracy meets the required standards, the chosen nozzle can be deemed suitable.
Decision Criteria
Component Size vs. Nozzle Diameter:
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The fundamental criterion is ensuring that the component's size exceeds the diameter of the selected nozzle. This provides the necessary clearance for a secure pick-and-place operation.
Precision Tolerance
While flexibility is encouraged, precision is non-negotiable. If a particular combination compromises precision, it is advisable to reevaluate the nozzle choice.
The flexible use of SMT nozzles involves a strategic balance between component size, nozzle compatibility, and precision requirements. Through systematic experimentation, careful evaluation, and optimized programming, you can achieve a versatile and efficient SMT assembly process.
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.
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.
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.
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