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Pulse Heated Thermode Selection Guide - 4 Pages

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Catalogue excerpts

The resistance of the thermode to the flow of electrical current produces the heat required to melt the solder and create the connection. As the electrical energy flows through the thermode, the heat generated is conducted directly to the workpiece. Since most of the electrical current passes through the thermode, there is little chance of electrical damage to the workpiece. Thermode Selection Guide The temperature of a pulse heated thermode will normally be at ambient when it contacts the parts. A quality thermode should be capable of heating itself and the portion of the workpiece it contacts in a very short time. Because of its low thermal mass, the thermode heats and cools rapidly. The amount of energy transferred to the part by the thermode should be of the same order of magnitude as the energy required to reflow the solder. After the reflow temperature is reached and the solder has flowed sufficiently, the current is terminated. The thermode remains in contact with the parts just long enough for the solder to solidify. THERMODE SELECTION The size and thermal properties of the workpiece directly affect the amount of heat required. This is why thermodes incorporate a thermocouple which provides temperature data to a closed loop heating system (Uniflow®). • Wide variety of tip shapes and sizes • Uniform heating • Dimensionally stable The pulse heated control performs the following functions during the soldering process: Miyachi America offers a variety of thermodes for different applications. In order to optimize the transfer of thermal energy from the thermode to the part, the thermode footprint should equal or exceed the size of the part. If a part is thermally more conductive than the thermode, the thermode may not be able to reach reflow temperature. • Detects when the mechanical system (head) has applied the programmed pressure of the thermode to the parts. • Rapidly heats the thermode. • Maintains the preset temperature for a precise time to achieve a quality joint. • At the end of the cooling period, the control signals the head to retract the thermode from the parts when the joint has solidified. Thermode life is dependent on set point temperature. Brazed construction offers increased operating life. HOT BAR REFLOW SOLDERING MOUNTING BLOCKS FOR THREEDIMENSIONAL THERMODES (TD) QUICK CONNECT BLOCKS (QCB) FOR THERMO-PLANE THERMODES This range of thermode QCBs will fit on all Unitek EAPRO SH80 and SH500 series weld heads. The QCB and Thermo-Plane Thermode are designed to be used as a set. The set is ground to optimize co-planarity resulting in the best quality of product bonds. The set also enables fast exchange of the Thermode in mid-production without further adjustment. The special shaft design of the QCB guarantees repeatable position of the thermode. This range of thermode mounting blocks will fit on all 80, 84 and 180 series weld heads and is standard with the 87SA/24, 84SA/24 and 180SA/24. The robust design allows efficient heat dissipation for applications with high repetition rates. The design also facilitates efficient current transfer to the thermode, thus allowing fast heat-up and cool-down, and therefore the shortest process times. A nozzle for cooling air is fitted and a cooling module can be ordered specially to fit to the Uniflow control. Unitek Eapro quick connect block (QCB) SMALL 45mm / 1.77" MEDIUM Miyachi Unitek Mounting Blocks The SMALL block (P/N: 17TDSB177) is standard on the 87SA/24 head. The MEDIUM block (P/N: 17TDMB256) is standard on the 84SA/24. The LARGE block (P/N: 17TDLB413) is standard on the 180SA/24. Pulse Heated

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17TD THREE DIMENSIONAL THERMODE THERMO-PLANE THERMODES To suit block size The TD (three-dimensional) family is a new range of thermodes designed to give optimum performance in the production environment. Thermoplane thermodes are specially designed by Unitek EAPRO for ultrafast heating and cooling cycles, minimizing process times. Forced aircooling further speeds the bonding process. Thermodes are designed to maintain co-planarity and withstand the deformation that can result from the high forces that may be necessary in the bonding process. The ThermoPlane Thermode eliminates voltage drop as...

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17BW MULTIPLE LEAD WIDE BLADE THERMODE Stainless Steel, Chrome Plated Stainless Steel, Chrome Plated • Application – Ideal for reflow soldering at operating temperatures up to 600º C. • 1.2 to 2.5 inch length faces available with thermocouple feedback. Special order other sizes. • Stainless steel construction gives long life. • Profiled blade shape for uniform heating. • Integrated cooling air tube reduces cooling time and increases throughput. • Dual mounting system: fixed mounting hardware eliminates movement for critical applications. • Self aligning pivot type mounting hardware ensures that...

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17P SINGLE POINT PEG TIP THERMODE Thermode 17P20 17P40 17P50 17P75 17P93 Note: Mounts to 50A, 50F and 87A, 87F heads. • Application – Reflow solder subminiature electronic components or small wires to rigid or semi-rigid substrates. • Peg shape tip provides excellent accessibility. • Face diameters from .020 to .093 inches. • Thermocouple feedback. High temperature plastic strap provides protective strain relief for thermocouple attachment. • Brazed tungsten construction for long life. • J type thermocouple (K & E type optional). A 17P20 peg tip thermode reflow solders a plated contact and bus...

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