Strack Norma Tailored latch locks: Finding the right solution for your mould

Editor: Steffen Donath

Customised production, numerous possible combinations, custom dimensions in all variants — with a large repertoire of latch locks, offered by Strack Norma.

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Latch lock series Z3-Z4-Z5 (from left to right).
Latch lock series Z3-Z4-Z5 (from left to right).
(Source: Strack Norma)

Movement – Latch locks control the movement sequence of the individual parting planes at the opening of an injection mould, which is adapted to the demoulding of the article. In general, in the applications a distinction can be made between:

1. Latch locks that are actuated by the tool stroke and 2. Latch locks that are controlled by the ejector stroke.

For latch locks which are actuated by the tool opening, a distinction is made between latch locks with and without retardation. Depending on whether at first the additional parting plane or the main parting plane is opened.

If the additional parting plane should reliably be opened before the main parting plane, a latch lock without retardation is used.

If an additional parting plane after previous partial opening of the main parting plane should be driven, usually latch locks with retardation are used for such a task, before the main parting plane completely opens. A classic application case is the three-plate tool. Due to the tool movement, the moulded parts are separated from the distributor at the pin gate. The distributor in the additional parting plane demoulds and ejects the moulded parts in the main parting plane.

Strack Norma offers a variety of variants from up to 90 latch locks like round-, flat-, hook-, push lock-, early return- and double stroke latch locks and therefore allows many combination possibilities.

“Our latch locks of the series Z3, Z4, Z6 and Z7 are provided in the functionally decisive areas with a DLC-coating.”, explains Ludger Müller, technical manager of Strack Norma. “This contributes to increase the profitability significantly, i.e. a longer service life due to wear reduction and the associated reduction of the maintenance costs.

Due to the low moving masses, the latch locks offer high opening- and closing speeds. As a result, also the use at fast-running tools is guaranteed. The mechanical design, the proven construction and the production-safe operation due to forced control characterise the latch lock compared with other constructions e.g. by hydraulic cylinders which are operated by the machine control.”

As individual as the tools of today are also the solutions to realise movement sequences. This very often leads to a variety of special solutions, which the technicians of Strack are individually elaborating for the customer, the company promises.