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Specifications: Model 7400D Series, Wedge-Wedge Wire
Bonders, Manual X-Y-Z Last Revised: 4/18/2003
Overview
Year 2000 saw the "C" Series finally replace the venerable
"A" Series, and now witnesses the transition from
"C" to "D". The "C" Series brought
forth improvements to the core X-Y-Z manipulator ? independently
guided and locked axes ? but retained the "A" Series
tool assembly. Now "D" Series brings across the revolutionary
"E" wire clamps and groups them with their drive motor
and a full wavelength transducer on a new tool assembly pivoted
as before. The X-Y-Z follower mechanism has improved linear
ways and accepts the new tool assemblies of the wire bonders
as well as other cast-body tool assemblies.
The angled wedge wire bond configuration is shown below.
Application
Machines of this series bond aluminum or gold wires from 0.0007
in. to 0.002 in. diameter, 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 fed to the
work point by two methods selectable by exchange of wire clamps;
either diagonally through the heel of the bonding wedge, or
vertically down through a hollow wedge. Either allows programmed
motions to clamp, break, and feed wire continuously, but requires
front-to-back bonding direction
Bond Tool Head Assembly
The all-new tool assembly of this series features wire clamps
brought over from "E" Series. The Clamps are air-opened
and spring-closed, and have self-contained closure pivots. A
separate pivot about an axis located to serve both overhead
and angled feed generates the clamp motions along their lines
of feed action. To change between angled feed and overhead feed,
it is necessary only to exchange the small clamp assemblies
and to change the wire drag means. Alignment of clamps to the
tool is facilitated by individual adjustments along three axes.
Actuation of all clamp motion is by the same spiral cam of an
onboard motor. Appropriate clamp motion settings for each method
are configured in software and are retained in non-volatile
memory. Motions toward the tool are spring-driven, while the
more powerful motor drives away from the tool ? to ease concerns
during set-up.
The ultrasonic transducer is K~Sine Model K~74D-W, 1½ wavelength,
operating at a nominal frequency of 63 Khz and with tool length
of 0.750-in. dropped 0.656-in.below center. Ultrasonic power
supply is K~Sine built-in, five Watts, dual channel.
Two values of bond force in the overall range of 18 to 90 grams
are adjusted at the tool assembly as two preset positions of
a compression spring. Either high or low force setting can be
programmed for each bond. Initiation of bonding is upon the
opening of the firing switch.
The elevation at which to feed new wire is measured from each
bond by an optical encoder on the Z Axis. More importantly,
this encoder can initiate clamp re-closing to control wire loop
arch consistently. Radiant tool heat with panel mounted, constant
current control is included.
Mechanical
Throat reach is 5.125-in. from tool home position back to the
machine lower panel. Vertical clearance above the work plane
with 0.750-in. tool length is 0.438-in. over a reach of 3.750-in.
and is 0.188-in. over the balance of reach. This clearance applies
for either angled or overhead clamps, except immediately behind
the tool for angled. The pivot radius of the tool assembly is
the same 8.688-in. extant for West?Bond’s history, as is the
pivot radius of 12.000-in. of the X-Y-Z manipulator assembly.
Range of movement of the tool by manipulator control is 0.563-in.
vertically and 0.625-in. in horizontal directions with an 8/1
ratio of mechanical advantage.
The work platform is a bolt-on assembly. An optional adjustable
height platform is available as Feature -79.
Preparation of a new end of the wire stock and the threading
of that end into the feed hole of a 45? bond tool can be done
automatically by machine motions following a simple location
of the wire relative to the tool. The method is patented and
requires use of special bond tools available from West?Bond.
ESD Protection
Protection against Electrostatic Discharge is implemented by
finishing exposed tool assemblies and other moving parts by
Electroless Nickel plating, which is conductive; and all exposed
painted parts with a powder-coated paint that is dissipative.
Electrical Software and Hardware
Control of machine logic, motor motions, and Ultrasonic energy
is programmed to and executed by West?Bond Part No 8100 CPU
containing a Motorola 68000 microprocessor and 256 KB of nonvolatile
RAM. All machine configuration constants and bond settings are
programmable at the machine panel, prompted by a series of "screens"
displayed on a 4-line 40-character LCD. Three separate buffers
of bond settings for a wire type can be entered and selected
during bonding by a selector switch. Each wire type can have
approximately 21 stitch bonds, each with its own settings of
ultrasonic power and time. All programmed values are displayed
during bonding. At "home", various options are enabled.
Definitions of Models of this Series:
◆ Model No. 7476D. This machine with interchangeable
wire clamps for bonding by either angled-feed or vertical-feed
wedge bond methods.
◆ Model No. 7440D. Insulated
Wire Bonder Series, -- see separate specification.
Features available for this Series:
◆ Feature No. 79. Adjustable
height work platform.
Machine Configuration
The microscope recommended for this series is Nikon SMZ660 with
the "Luxuray" LED No. 10265.01 illuminator. Neither
microscope nor illuminator are included. One recommended bonding
tool is included.
All work holders are priced separately. Quite a large number
of previously designed special work holders, both heated and
unheated, are listed under Products, Workholder Assemblies,
on West?Bond’s Web Site. Those with Status of "Current"
are maintained in stock and can be ordered with machines: This
selection covers most needs. If a selection must be made with
Status "AvailableNotStocked", then it must be ordered
on a separate purchase order.
Services Required
Compressed air, regulated to 50 psig, is required. Connection
is via 1/4-inch tubing.
Electrical service required is 100-120 VAC, 50-60 Hz, 2 Amps.
For 200-240 VAC, an external step-down transformer is required
which must be secured by end-user as electrical codes vary from
country to country.
Dimensions
Machine size is 22" deep X 19" wide X 12" high,
exclusive of microscope, or 18" in height to scope eyepieces.
Weight is 60 lb. uncrated, or 95 lb. crated.
Click here
to see Photos of Bond Tool Assembly.
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