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Description: The West·Bond 7400A is an ultrasonic/thermosonic wedge-wedge wire bonder designed to interconnect wire leads to semi-conductor, hybrid or microwave devices. The machine bonds aluminum or gold wires ranging from 0.0007 in. to 0.002 in. Bonds are made by the wedge-wedge technique using ultrasonic energy to attach aluminum wire at room temperature and adding work piece heat for gold wire. Wire is clamped and threaded diagonally under the bonding wedge, allowing independent feeding action but requiring front-to-back bonding direction. The bonding tool is lifted and lowered manually by the operator using hand/eye reference to the work elevations and to loop height.
Control of bonding wire motion for severing and feeding new tail length under the bond tool is accomplished by a motor driven cam bank on the tool mount platform guided by the X-Y-Z manipulator. The motor is Haydon, AC Synchronous, Model K81415. The cam bank is run to fixed positions defined by Hall Effect switches, which complete portions of the motions cut into the cam faces for the functions of severing and feeding. Beyond the fixed positions, the cams can be moved incrementally by timing logic to vary the length of the tail fed and to reverse to re-close clamps for loop arching.
For short connections, re-closing the clamps for loop arch control before descent to bond can be signalled by two methods; manually by push button switch, and automatically when a mechanically adjusted elevation is reached in the tool path. Selection between these methods is by panel switch. Stitch bonding capability is provided for one, two or three loop arches, selectable by panel switch. In operation, wire severing is withheld until the selected number of loop arches is completed.
This unit has the following options:
26 = Unknown
28 = Inching Control for wire feed to vary position of tail end before bond
44A = Radiant tool heat with panel mounted, constant current control
45E = Unknown
46 = Unknown
66 = Adjustable height rotary platform, screws up or down through a range of approximately 0.500 in.
This auction includes a West-Bond 7400A Wire Bonder, a West-Bond 1400 Controller, and a Wild M3Z Microscope.
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