Machines of 7300C Series pick up and place chips and then bond them by the mechanical scrub, eutectic method. All operation is controlled by West·Bond’s unique three-axis micromanipulator under microprocessor control. The work piece is held on a heated work holder, where chips are also arrayed for pick up.

The bond tool is a fitted die collet heated by a radiant heater with steady state control. Bonding of the die to the work piece by the eutectic method is initiated by mechanical scrub action in "Y" Axis, imparted to the tool by a motor driven linear actuator. The distance of scrub strokes, the number of stroke repetitions, rate of stroke and delay before scrub are executed by microprocessor routines. Bond force is adjusted by compression spring through the range of zero to approximately 75 grams. Initiation of scrub action and toggling of vacuum are controlled by the firing switch upon work contact. An optical encoder on the Z Axis reads elevation above work contact so that the sequence of pick up and bonding can be completely controlled by simple motions of the single lever manipulator. This method is further enabled by the design of the "C Series" manipulator in which each axis is independently guided and therefore can be locked on command by pneumatic brake. As implemented here, the Z and Y Axes are locked during bonds.

All machine configuration constants are programmable at the machine panel, prompted by a series of "screens" displayed on a 4-line 40-character LCD. West·Bond Part No 8100 CPU containing a Motorola 68000 microprocessor and 256 KB of nonvolatile RAM controls execution. Using for input either the encoder that reads tool position down from home, or a panel toggle switch can do entry of program values. These values together with sequence status are displayed during bonding.

Both the work piece and the chip array are held on the free workstation that is moveable to present chip or work piece to the tool for pick up or placement. Two adjustable height work platforms are available as options, one with planarity control and one without.

• Model No. 7316C. The machine described here for eutectic die bonding. One set of values are programmed for velocity, distance and number of "Y" axis scrub strokes. Scrub Horn Part No. 869 is standard and accepts collets of 0.0625-in. diameter; Part No. 869.001 is available on special order to accept collets of 0.1250-in. diameter. For this model, the length of collets of both diameters is 0.6250-inch.
• Model No. 7327C. This machine with a pneumatically operated turret mechanism to rotate into use position a succession of six differently sized die collets. Collets may not be heated. The turret head tool assembly No. 8695 replaces Model 7316C tool assembly No. 8697. Turret advance to the next position is by a pushbutton switch on the manipulator control. Six sets of values for velocity, distance and number of "Y" axis scrub strokes are entered into buffers associated with the turret tool positions, and so execute a scrub motion program appropriate to each bond tool. The Hexa-collet Turret Part No. 1009 is standard and accepts collets of 0.0625-in. diameter; Part No. 1009.001 is available on special order to accept collets of 0.1250-in. diameter. For this model, the length of collets of both diameters is 0.4375-inch.

• Feature -81: Adjustable Height Work Platform for "C" and "E" Series

The work platform is adjustable vertically by a single thumb screw through a range of 5/8 in., and with Planarity Control, adjusts thru a range of 0.625 in., 0.09375 above and 0.53125 below nominal work elevation. Planarity control of platform is by 3-point adjustment.

Note that Die Collets are not included but should be ordered directly from Tool manufacturers.

Workholders also are not included, and are priced separately. Quite a large number of previously designed special workholders, both heated and unheated, are available for selection from the Workholders Product List on our Website: Those with Status of Current can be selected for delivery in the same time span as the machine, while those of Status AvailableNotStocked must be ordered separately. Workholders for new work pieces requiring custom design and fabrication will be quoted upon receipt of drawings and samples: These must be ordered on separate purchase orders.

K~Sine Model K~1200D Temperature Controller is recommended and is priced separately with the work holders.

The microscope recommended for this series is Nikon SMZ660 with the "Luxuray" LED #10265.01illuminator. Neither microscope nor illuminator are included. Die collets are not included.

Compressed air at 50 psi and shop vacuum are required for operation. An air pressure regulating valve and an indicating pressure gauge are provided.

For 200-240 VAC, an external step-down transformer is required - must be secured by end-user as electrical codes vary from country to country.