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Pulse Heated Thermode Selection Guide - 4 Pages

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

65mm / 2.56"

LARGE

105mm / 4.13"

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.

1/4

HOT BAR

Pulse Heated

THEORY OF OPERATION:

Pulse Heated Thermode Selection Guide
  1. P. 1

  2. P. 2

    HOT BAR17TD THREE DIMENSIONALTHERMODETHERMO-PLANE THERMODESTo suit block sizeThe TD (three-dimensional) family is anew range of thermodes designed togive...
  3. P. 3

    HOT BAR17BW MULTIPLE LEAD WIDE BLADE THERMODEThermode17BW1200Stainless Steel, Chrome Plated1.200.06017BW2187Stainless Steel, Chrome Plated2.187.06017BW2500•...
  4. P. 4

    HOT BAR17P SINGLE POINT PEG TIP THERMODEThermode17P2017P4017P5017P7517P93D (inch).020.040.050.075.093L (inch).070.070.200.070.250Note: Mounts to 50A, 50F...
Text version

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