October, 2019
www.us-
tech.com High-Viscosity Fluid Air Assist Dispensing Continued from previous page
blow off excessive potting from the dispense tips between cycles. BCS engineering came up with a concept to utilize the blow/off feature during dis- pense to help breakup the material from webbing across the PCB fill hole. The blow/off stop-cock block manifold fea-
tures a main air line that channels pressured air through three air vanes at the base of the dispense nozzle. The goal was to push air while dispensing to help move the material down and away from the PCBA fill-hole. BCS requested PVA technical serv- ices through its website hub to temporarily modify its operating software. Only the air pressure was identified at this
phase to isolate any potential benefits during dis- pense. After optimizing the air pressure, with no change to pump speed or dispense time, the process revealed a shift in how the material flowed more evenly in and around the potting well. Physical teardown of the parts illus- trated a measurable improvement in how the potting flowed more evenly (distributed volume) with little or no evidence of potting adhering to the PCBA fill hole region. Preliminary re- sults confirmed that utilizing air as- sist during dispense does help to over- come the wetting forces of the materi- al in areas of restricted space. In cer- tain cases, heat, angle, and pump speeds alone are not enough in con- trolling higher wetting forces.
Permanent Upgrade BCS made a decision to move
forward with a permanent upgrade to incorporate the blow-off/air assist in its dispense operation. The upgrade also includes a three-stage dryer membrane on the main air supply line to ensure that no contaminates would compromise the TPM sensor during dispensing. After completing the installa-
tion, BCS performed a DOE to opti- mize the process. The DOE consisted of three factors, air pressure, pump speed and dispense time, in a two- level factorial experiment. After ana- lyzing the test data, an interesting correlation was noted between pump speed and air pressure.
Lenthor Continues Capacity Expansion Plan
Milpitas, CA — Lenthor Engineering, a California-based designer, manu- facturer and assembler of flex and rigid-flex PCBs, is progressing ahead with its capacity expansion plan. In order to stay ahead of increas-
ing demand for Lenthor’s flex and rigid-flex fabrication services, the company has reserved more than $3 million dollars in its fiscal 2019 capi- tal budget plan. The company is meeting its
2019 capital budget pledge with the addition of a 6th ESI Laser model 5335. The addition of this state-of- the-art laser provides for the addi- tional production capacity needed to stay ahead of customer demand. Contact: Lenthor Engineering,
311 Turquoise Street, Milpitas, CA 95035 % 408-957-3487 E-mail:
davidm@lenthor.com Web:
www.lenthor.com
1 See at productronica, Hall A4 Booth 305 6 5:25 PM With the award winning TMT-R9800S Precision Soldering Robot Increasing the pump speed in conjunction with
air pressure surprisingly reduced the wetting force’s ability to slow down the material flow, allowing it to flow more freely through the narrow channel in the housing well. This observation suggests that inject- ing the material faster under the influence of air pressure retards the material’s ability to bond im- mediately to any surfaces during initial flow into the housing assembly. Thousands of parts were processed with this
change and production reported no issues with pot- ting accumulating around the PCB fill hole. This modification eliminated the 0.36 percent reported scrap. In addition to the scrap savings, a second unexpected savings was achieved with cycle time. By incorporating air assist during dispensing,
BCS engineering was able to increase its VPX-2K pump speeds and reduce dispense time without sacrifices to volume shot size requirements. This
yielded a 19 percent improvement in cycle time. Annual cost savings for the modification showed a net savings of $45,000 and an ROI of less than three months. With this new function, BCS was also able to
increase its capacity loading without the need to invest in additional overhead. PVA technical serv- ice through its web-based team viewer made it pos- sible to change the software quickly. The working relationship between PVA and BCS encourages many new possibilities for innovation as BCS con- tinues to grow its business and investments. Contact: BCS Automotive Interface Solutions,
2150 Cranebrook Drive, Auburn, NY 13021 % 315-258-3400 Web:
www.bcs-ais.com and PVA, One Mustang Drive, Cohoes, NY 12047 % 518-371-2684 fax: 518-371-2688 E-mail:
info@pva.net Web:
www.pva.net r
See at productronica, Hall A2 Booth 253
Page 45
2019 Vision Award Winner
2019 EMI Innovation Awards
2018 Global Technology
l Award Winner 2019 NPI Award Winner SOLDER SMART
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