In automated production, the key to applying thermal grease to heat sinks using dispensing equipment lies in the precise control of the amount of grease, the application path and the equipment parameters. This typically involves three main stages: preparation, dispensing and pressing.
Ι.Automated Dispensing Process?
1. Preparation and Fixing
Before dispensing, the heat sink base must be fixed to the dispensing machine’s work platform using a dedicated clamp (such as an adjustable baffle) for precise positioning to prevent displacement during dispensing. Simultaneously, the thermally conductive material needs to be connected to the dispensing system.
● Fixing the Heat Sink: First, the heat sink base needs to be fixed to the dispensing machine’s work platform using a clamp for precise positioning to prevent displacement during dispensing.
● Connecting the Dispensing System: The dispensing of thermally conductive gel is usually packaged in 30cc, 55cc syringes, or drum larger containers, and directly connected to the dispensing machine’s dispensing system.
● Material Type: Thermally conductive silicone grease; Dispensing Form: Syringe, drum container; Characteristics: High viscosity, typically using servo pressure dispensing technology for precise control.
Automatic In-line PCB Glue Dispensing Machine SEC-DH400L
Second Intelligent In-line Automated Glue Dispensing Machine SEC-DH400L adopts an integrated mineral casting design, with ultra-high precision and super stability, powerful expansion capabilities, and can realize ion cleaning, dispensing, detection, UV exposure and other functions;
Adopting a gantry structure, it can bear large loads, stable structure, and a powerful CCD visual positioning system, which can meet the requirements of Mark point positioning, edge positioning, and 3D scanning positioning; strong scalability, and can expand AOI detection 3D detection, UV exposure curing and other functions;
Strong platform compatibility, contact and non-contact dispensing, single-head and multi-head synchronous dispensing, automatic compensation and adjustment of double-head spacing, five-axis dispensing function based on needle A/R displacement, etc.
2.Setting up the dispensing process (this is the most critical technical step)
During dispensing, based on the heat dissipation area and gap requirements, the following path patterns are mainly selected:
a.Coating area: less than 15mm × 15mm, recommended dispensing path: dot application, meaning a single dot of adhesive is applied to the center of the heat-generating component;
b.Coating area: greater than 15mm × 15mm, recommended dispensing path: “U” shape or “S” shape/serpentine shape, ensuring uniform adhesive coverage and avoiding air bubbles.
c.Coating area: elongated area, recommended dispensing path: linear, L-shaped, meaning even application along the long side.
● Calculating adhesive volume: The dispensing volume needs to be calculated based on the designed gap and chip area. Empirically, the dispensing height is usually 2-3 times the final bonding gap.
● Equipment parameters: Set appropriate pressure (eg, reference value 621 kPa), flow rate (eg, reference value 25 g/min) and dispensing time, and select appropriate needles (eg, conical or angled needles) to suit different scenarios.
3. Pressing and Curing
● Bonding and Assembly: After dispensing, the heat sink is vertically pressed onto the heating element using a pick-and-place machine or manually. The gel automatically spreads under pressure, filling all microscopic gaps.
● No Curing Required: Most single-component thermal conductive gels are thixotropic and do not require oven curing. Assembly is completed after pressing, greatly simplifying the production process.
SMT automatic glue dispenser SEC-DH600L
Second Intelligent high precision smt automatic glue dispenser machine apply epoxy resin to the bottom of the PCB board for underfill
Second Intelligent smt automatic glue dispenser automation SEC-DH600L has the following advantages:
● CCD visual programming precise positioning, visual correction, improve programming efficiency and dispensing accuracy;
● Chinese and English operating system, the software interface layout is clear, the operation is simple, easy to learn and understand;
● Support visual inspection, integrated control of dispensing and visual inspection, multi-purpose machine, effective control of dispensing yield;
● It can be equipped with a lin e laser scanner for 3D path guidance and flexible dispensing;
● The software can support a variety of dispensing systems and functional module applications, such as automatic needle alignment, automatic height measurement, dispensing weighing compensation, five-axis linkage and other functions, which can effectively overcome the difficulties of various dispensing processes and help improve quality;
Ⅱ.Key Considerations and Equipment Selection
● Compatibility with high-viscosity adhesives dispensing machine is crucial: Thermally conductive gels (especially those with high thermal conductivity above 6 W/m·K) have very high viscosity, easily leading to stringing with ordinary dispensing valves. Industrial production often uses screw pump dispensing machines or piston dispensing valves, which provide stable extrusion pressure, ensuring accurate adhesive dosage and clean, crisp dispensing.
● Strong tolerance adaptability: Thermally conductive gels are very soft and have low compressibility, perfectly adapting to gaps from 0.5mm to 4mm, making them particularly suitable for assembly scenarios with large tolerances or uneven surfaces.
● Quality control: After dispensing, the coating area and position are typically checked using a vision system, and the heat dissipation effect is inspected using online temperature measurement or thermal imaging.
Double Barrel Precision Screw Pump Glue Supply
Automated dispensing significantly improves production efficiency and ensures consistency in dispensing position and amount. Furthermore, for materials such as thermal pads, automated placement machines can also be used for placement.
Second Intelligent has played an important role in theresearch, development, manufacturing, pre-sales and after-sales services of fluid dispensing robot , potting and coating solutions which range from various types of automatic fluid dispensing, potting, two-component potting machines and coating machines with desktop, free-standing, inline or cobot combined systems, and widely used in global electrical, electronics, home appliances, automobile, telecom, pharmaceutical, automotive electronics, semiconductor, aerospace, LED and more.
