Classification of Precision Jigs

2026-05-16

Jigs can be classified into three categories: process assembly jigs, project testing jigs, and circuit board testing jigs. Among them, process assembly jigs include assembly jigs, welding jigs, disassembly jigs, dispensing jigs, irradiation jigs, adjustment jigs, and cutting jigs. Project testing jigs include life testing jigs, packaging testing jigs, environmental testing jigs, optical testing jigs, shielding testing jigs, sound insulation testing jigs, and so on. Circuit board testing jigs mainly include ICT test jigs, FCT functional jigs, SMT reflow jigs, BGA test jigs, and CCD test jigs.

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Classification of Precision Jigs

As indispensable auxiliary tools in industrial production, manufacturing, and inspection, jigs play a core role in standardizing operational procedures, improving production efficiency, ensuring product quality, and reducing human error. They are widely used in electronics, machinery, automotive, aerospace, and many other fields. Based on their functional use and application scenarios, jigs can be mainly divided into three categories: process assembly jigs, project testing jigs, and circuit board testing jigs. Each category contains several sub-types, as detailed below:

 

Process Assembly Jigs

Process assembly jigs are core auxiliary tools in production and assembly processes. They are mainly used for positioning, fixing, assembling, and machining product components, ensuring precision and consistency in assembly, reducing manual operation errors, and improving assembly efficiency and product yield. Their sub-types and characteristics are as follows:

Assembly Jigs: The most basic and widely used type of assembly jig, primarily used to accurately join and assemble multiple components according to design requirements, such as jigs for assembling mechanical parts or electronic components. Their core advantage lies in using positioning pins, limit blocks, and other structures to fix the relative positions of components, preventing misalignment or displacement during assembly, making them suitable for standardized assembly in mass production.

 

Welding Jigs: Specialized auxiliary tools for welding processes, divided into manual and automated welding jigs. They are used to fix the components to be welded, ensure the accuracy of weld points, prevent deformation or displacement of parts during welding, and reduce defects such as spatter or cold joints. They are suitable for welding metal parts, electronic component leads, etc., such as circuit board pin welding jigs and automotive part welding jigs.

 

Disassembly Jigs: Opposite to assembly jigs, these are used for disassembling or taking apart products, especially for repair, rework, or recycling. Their design must conform to the product structure, using dedicated clamps or prying mechanisms to efficiently disassemble without damaging components. They are commonly seen in electronic device repair and scrap product recycling.

 

Dispensing Jigs: Used for automated or semi-automated dispensing operations. They secure the product with positioning structures to ensure precise control of dispensing position and volume, avoiding offset, overflow, or missed dispensing. Widely used in fixing, sealing, and bonding electronic components, such as smartphone screen dispensing jigs and circuit board component dispensing jigs.

 

Irradiation Jigs: Primarily used with ultraviolet, infrared, or other irradiation equipment for curing or drying processes, such as UV glue curing or coating drying. They secure the product and ensure uniform irradiation area, improving curing efficiency and quality. Common in electronics, plastics, and printing industries.

 

Adjustment Jigs: Used for precision adjustment and calibration after product assembly, such as adjusting component position, gap, or angle. Through precise adjustment mechanisms, they help the product meet required accuracy standards, suitable for high-precision products like instruments and precision machinery.

 

Cutting Jigs: Used for cutting or shearing product components, such as wire cutting, metal sheet shearing, or plastic part cutting. Their design matches the material characteristics and dimensions to ensure flat cuts and dimensional accuracy, improving cutting efficiency and avoiding errors and safety hazards of manual cutting.

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Project Testing Jigs

Project testing jigs are mainly used for performance testing, quality inspection, and reliability verification of products. By simulating the product’s operating environment and working conditions, they accurately measure various product indicators to determine whether the product meets design requirements and industry standards, providing a basis for quality control. Their sub-types cover multiple testing scenarios, as follows:

 

Life Testing Jigs: Used to test the service life or fatigue strength of products or components. They simulate long-term use, accelerating aging and wear to detect performance stability over a period. Examples include life test jigs for electronic components and fatigue test jigs for mechanical parts, widely used in product reliability verification.

 

Packaging Testing Jigs: For testing packaging performance, such as compression resistance, drop resistance, water resistance, and moisture resistance. They simulate various conditions during transport and storage to determine whether packaging effectively protects the product, suitable for quality inspection of various product packaging.

 

Environmental Testing Jigs: Used with environmental testing equipment to simulate product operation under different environmental conditions (e.g., high temperature, low temperature, humidity, air pressure, dust), testing environmental adaptability. Examples include high-temperature test jigs and low-temperature environment simulation jigs, commonly used for products in electronics, automotive, and aerospace industries.

 

Optical Testing Jigs: Used for optical performance testing, such as brightness, color difference, clarity, and light transmittance. They position the product to ensure precise light projection and measurement angles, applicable to displays, optical lenses, LED lamps, and other optical products.

 

Shielding Testing Jigs: Mainly used to test electromagnetic shielding performance, preventing external electromagnetic interference and ensuring the product’s own emissions do not affect other devices. Examples include electromagnetic shielding test jigs for electronic products, widely used in mobile phones, computers, and communication devices.

 

Sound Insulation Testing Jigs: Used to test sound insulation and noise reduction performance, such as for automotive parts or home appliances. They simulate noise environments to measure sound insulation effectiveness, ensuring compliance with noise emission standards and improving user experience.

 

Other Testing Jigs: In addition to the above, project testing jigs also include withstand voltage test jigs, insulation test jigs, vibration test jigs, etc., designed according to specific testing requirements for various products.

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Circuit Board Testing Jigs

Circuit board testing jigs are specially designed for testing printed circuit boards (PCBs), flexible printed circuits (FPCs), and similar products. They are used to test circuit connectivity, component soldering quality, and functional performance, making them key equipment for quality control in electronics manufacturing. Their main sub-types are as follows:

ICT Test Jigs (In-Circuit Test Jigs): Mainly used for in-circuit testing of PCBs to detect basic faults such as missing components, poor soldering, short circuits, or open circuits. Probes contact test points on the board to quickly assess basic quality, suitable for rapid screening in mass production of PCBs.

 

FCT Functional Jigs (Functional Test Jigs): Used to test the overall functional performance of PCBs by simulating actual operating conditions and checking whether output signals and operating parameters meet design requirements. Examples include functional test jigs for mobile phone motherboards or power supply boards, capable of accurately identifying functional faults and ensuring proper product operation.

 

SMT Reflow Jigs: Used in SMT (Surface Mount Technology) production to position and protect PCBs as they pass through reflow ovens. They secure the PCB to prevent deformation or component shifting during reflow and protect sensitive components, ensuring the quality and efficiency of SMT assembly. They are core auxiliary jigs on SMT production lines.

 

BGA Test Jigs: Specifically designed for testing BGA (Ball Grid Array) components, checking soldering quality and circuit connectivity. Since BGA leads are hidden beneath the package, ordinary test tools cannot directly access them. BGA test jigs use dedicated probes or test sockets to achieve precise testing, suitable for high-end electronic device PCBs.

 

CCD Test Jigs: Combined with CCD (Charge-Coupled Device) imaging technology for visual inspection of PCBs, such as line accuracy, component placement position, and solder joint quality. By positioning the PCB and using a CCD camera to capture images, they quickly identify surface defects, improving inspection efficiency and accuracy, suitable for PCBs with high requirements for surface precision.

 

In summary, different types of jigs correspond to different production and testing processes. Their design and application must align with product characteristics and process requirements. Proper selection and use of jigs not only improve production efficiency and ensure product quality but also reduce production costs and reliance on manual labor, making them an important guarantee for standardized and large-scale production in modern manufacturing.

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