Components New centring unit by Strack Norma
Strack Norma introduces a new centring unit allowing for more precise positioning.
Strack Norma is expanding its program of centring units with the angular centring unit Z55. Thanks to the four-corner-radii the insertion in the tool can flexibly be positioned by means of a precision-milled square pocket. Usually, the tool is guided by the guide pillars and the guide bushes. However, with the modern and high-precision tools, it has become inevitable to guide the mould halves even more precisely in order to prevent a misalignment of the mould contour and to increase the quality of the parts. Thus, a pairing of pillars and bushes requires a play adaptation due to the warming in the tool. If this doesn’t happen, the result would be an increased clamping behaviour. This play adjustment requires the application of a fine centring.
The new angular centring unit Z55 of Strack Norma allows an improved part quality because its four-corner radii permit insertion in the tool by means of a precision-milled square pocket and thus a more precise positioning. It ensures that the tool can work exactly and that a flat mould contour without misalignment arises. The centring unit Z55 can be introduced over the centre axis in the tool like the other centring units in the program of the standard part producer to compensate different heat expansions in the two mould halves. They are screwed either from the parting plane or the rear side. Thanks to two-sided threads in the fixing holes the centring unit Z55 can easily be dismounted in the case of maintenance. It is available in 5 dimensions from 20 to 50 mm for different mould sizes so that it can optimally absorb the forces in each case.