MATERIALS | ELECTRICAL & ELECTRONIC
Precise positioning using rotary table machine
An optional “surround view” feature to make parking easier for BMW 7 Series drivers uses no fewer than four digital cameras. Eight-pin connectors, injection moulded in PBT and featuring liquid silicone (LSR) seals for protection against spray water and dust, are responsible for reliable connection between the cameras and the car electronics. German company H&B Electronic produces around two million of these connectors for Bosch each year on a two-component rotary table Allrounder machine from Arburg. It is the first time the com- pany has used LSR processing for its connectors. During production, eight separate
pins are fed from stamping reels, automatically bent and inserted into a carrier component by a Scara robot. The finished pre-assemblies are conveyed into the injection moulding cell on workpiece carriers. H&B Electronic’s Stephan
Schöne, responsible for project planning, says: “A combination of two injection moulding machines would have been significantly less expensive.
while also supporting the manufacturer’s need for consumer acceptance and a successful product launch.”
Earlier this year, Trinseo announced it had been selected to supply its Emerge 7700 PC/ABS blend to Mo Fe Ma, a start-up company based in Poland making a new portable foetal monitor called ZuZaMED. The expectant mother places it on her belly to monitor the health condition of the foetus; it can be used without any restriction to length of time. Emerge 7700 meets technical requirements for the application including not only good mechani- cal properties but also biocompatibility for extend- ed skin contact, low density, and V-0 flame retar- dancy. It can be cleaned with a 40% alcohol solution. It uses ABS produced using Trinseo’s mass
58 INJECTION WORLD | October 2017
Surround-view camera and components
However, the precise positioning of the pins is of the greatest importance for us. We’ve had extensive and very good experiences with rotary table machines. Combining two moulds on a single Allrounder also dispenses with coordination problems. We
Below: H&B Electronic’s production cell
consequently opted for a two-compo- nent Allrounder 1,500t rotary table machine with size 30 and 100 injection units for the LSR and PBT components respectively.” For the sprueless production of
the pre-moulded part, H&B Electronic built a four-cavity hot runner mould. For moulding-on the LSR seal, it uses a thermally self-sufficient cold runner mould. The mixing and dosing technology is supplied by Reinhardt Technik and the automation solution was implemented jointly with Arburg partner FPT Robotik. The fully automated produc- tion cell is completed by a traverse handling system, three six-axis robots as well as two inspection stations and one tempering station.
polymerisation technology, which results in a very white base resin; this was essential for the applica- tion, as Mo Fe Ma wanted a base colour with as little yellowing as possible for ease of colouring.
CLICK ON THE LINKS FOR MORE INFORMATION: �
www.aschulman.com �
www.akro-plastic.com �
www.basf.com �
www.lanxess.com �
www.dsm.com �
www.eurostar-ep.com �
www.trinseo.com �
www.victrex.com �
www.h-und-b.de �
www.arburg.com
www.injectionworld.com
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