PCB Manufacturing Equipment

Four Stages of Assembly

The key stages that must be considered when purchasing PCB equipment are paste application, automated component placement, soldering, and inspection.

cOMMONLY USED EQUPMENT AND THEIR PURPOSES

The Four Stages of Assembly

Each stage requires different equipment to ensure the PCB is built correctly, will function as intended, and be up to standards. In this article, we’ll go through each of the four stages, the commonly used equipment, and what should be used on your PCP equipment list.

01 Paste Application

PCB assembly involves applying solder paste to pads using a metal stencil with cutouts shaped for components. This ensures precise paste application, preparing the board for efficient placement and reliable soldering.

Solder Paste Printing Machine

A solder paste printing machine is specialized PCB equipment used to deposit solder paste onto printed circuit boards before placing surface-mount technology (SMT) components. This critical step ensures high-quality electronic devices by improving reliability and consistency in the final product.

Solder Paste Inspection (Spi) Machine

A Solder Paste Inspection (SPI) machine is an automated system used to inspect solder paste deposits on PCBs. It uses a high-resolution camera and software to analyze the paste’s quantity, position, and alignment. SPI machines ensure proper assembly, minimize defects, and improve production yield.

02 Automated Placement

Automated component placement uses machines to position and mount components on a PCB. Vision systems and algorithms guide precise placement, improving speed, accuracy, and reliability while reducing manual labor and enhancing product quality.

Glue Dispensing Machine

The glue dispensing machine in PCB assembly is a robotic dispenser designed to apply adhesive compounds to printed circuit boards. This process ensures components are securely bonded to the board, preventing movement or misalignment during subsequent manufacturing steps.

Pick-And-Place Machine

Pick-and-place machines can handle up to 30,000 components per hour, automating the process of placing small SMD components onto a PCB. This method ensures fast, accurate, and efficient assembly, enhancing speed, precision, and cost-effectiveness in PCB manufacturing.

03 Soldering

Soldering joins electronic components to a PCB using solder, a metal alloy with a low melting point. Adhesives, such as flex adhesives, help secure the board layers, ensuring structural stability.

Black FR4, an epoxy-based laminate, is commonly used for high-performance PCBs due to its excellent electrical and mechanical properties. This material is particularly valued in advanced applications requiring durability.

Reflow Soldering machine

A reflow soldering machine melts solder paste to bond surface-mount components securely to the PCB by heating it to the required temperature. Boards made from materials like polyimide, valued for their exceptional resilience and ability to withstand high temperatures, are often chosen, making them particularly suited for the reflow process.

Wave Soldering Machine

Wave soldering attaches components, especially through-hole types, by passing the PCB through a molten solder wave. A flux layer cleans the surface and ensures proper adhesion before the PCB undergoes soldering, creating secure electrical connections.

04 Inspection

Inspection is crucial in PCB assembly, ensuring the assembled board meets quality standards. This process identifies defects or issues impacting board functionality or reliability.

Automatic Optical Inspection (AOI) Machine

An AOI machine inspects PCBs for defects using cameras, lighting, and software for a non-contact visual inspection during assembly.

In-Circuit Test (ICT) Fixture

The ICT fixture tests a PCB’s electrical functionality by holding it in place and contacting test points. Electrical tests, like measuring resistance and capacitance, are compared to reference values to detect defects.

Functional Validation Test (Fvt) Fixture

The FVT fixture simulates a PCB’s end-use environment, testing performance under different conditions. It includes sensors, actuators, and components to replicate inputs and outputs.