A mould is an investment you only want to get right once. Yet, we regularly see designers and purchasers assessing mould costs separately from the total production costs. This is an expensive mistake. The choices you make in mould design determine not only the purchase price, but also the unit cost, lead time, and quality of every part that comes out of it.<\/p>\n
This article explains how that correlation works. And we're giving five concrete saving tips that you can apply immediately.<\/p>\n
Many companies focus on the mould price when comparing quotes. This is understandable, as it is the visible amount on the invoice. However, the mould also determines how many cavities are produced in one cycle, how fast the cycle runs, and how often the mould requires maintenance.<\/p>\n
A mould with suboptimal cooling channels leads to longer cycle times. These longer cycle times increase the machine costs per part. Over a hundred thousand products, this adds up significantly. A cleverly designed cooling system costs more during the tooling phase, but pays for itself during mass production.<\/p>\n
At Euro-Techniek, we always assess mould designs based on the total cost over the expected production lifetime. This provides a fairer picture than just the tooling invoice.<\/p>\n
A single mould is cheaper to produce. A multi-cavity mould produces more parts per cycle and reduces the unit cost. The choice depends on the expected volume, the desired lead time and the available tooling budget.<\/p>\n
Suppose you produce 200,000 units per year of a small technical component. A four-cavity mould roughly halves the required machine hours compared to a two-cavity mould. You will recoup the additional tooling investment within a few months of production.<\/p>\n
Always make this calculation in advance. We help customers determine the optimal number of cavities based on their volume forecast and desired unit price.<\/p>\n
Undercuts in an injection moulded product require slides or lifters in the mould. These significantly increase tooling costs and introduce extra moving parts that cause wear. More wear means more maintenance and a shorter mould lifespan.<\/p>\n
Many undercuts arise not from functional necessity, but from a design that is not aligned with the production process. A small adjustment in the geometry can make a slide redundant. Think of a hook that is positioned slightly differently, or an opening that escapes from a different direction.<\/p>\n
Here's what that looks like in practice: a connector housing that originally required two slides became producible without slides with a minor geometry change. Tooling costs fell by more than fifteen percent. The mould lifespan increased.<\/p>\n
The choice of mould material is linked to the plastic to be processed. Aggressive materials such as glass-fibre reinforced nylon will wear down a P20 steel mould faster than a mould made from hardened H13 steel. The cheaper mould material choice will then lead to higher maintenance costs and sooner repair work.<\/p>\n
Conversely, a fully hardened H13 die is not always necessary. For soft thermoplastic materials in limited volumes, a beryllium copper insert or an aluminium mould is sometimes the smarter choice. The thermal conductivity of these materials accelerates cooling and reduces cycle time.<\/p>\n
Euro-Techniek advises on which mould materials are suitable for the plastic, volume, and required surface finish during the design phase. This prevents costly mismatches later on.<\/p>\n
Flow analysis and cooling simulation are not a luxury but a worthwhile investment. With simulation software such as Moldflow, we calculate how the plastic melt fills the mould, where shrinkage occurs and where weld lines form. This provides insight even before any steel is machined.<\/p>\n
A weld line on a visible surface or in a critical structural part is unacceptable. Without simulation, you'll only discover this after the first shot test. Modifications to the mould will then be costly and time-consuming. With simulation, you make adjustments at the gate distribution and cooling channel design level, not at the level of physical corrections.<\/p>\n
For a technical precision part in fibreglass nylon, we discovered via simulation that the original gate location caused a weld line on the snap-fit mechanism. Relocating the gate eliminated the problem. The first injection trial immediately yielded a good part.<\/p>\n
A mould that is stationary for unplanned repair work costs far more than a mould that undergoes periodic preventative maintenance. Wear on ejectors, cooling channel contamination and surface degradation build up gradually. Those who wait until a problem is visible in the product have already produced thousands of rejected batches.<\/p>\n
Preventative mould maintenance includes cleaning cooling channels, inspecting slides and lifters, checking ejector pins, and reassessing cavity surface quality. The frequency depends on the material processed and the number of cycles.<\/p>\n
We advise customers to link a maintenance plan to the number of cycles produced, rather than a fixed period of time. This is technically more accurate and prevents both over- and under-maintenance.<\/p>\n
Setting aside the cost, there is another argument for good mould design: product quality. A mould that does not cool uniformly produces parts with uneven shrinkage and dimensional inaccuracies. A mould with insufficient draft angles will result in surface damage during ejection. These problems are visible in the final product and lead to rejection, rework, and complaints.<\/p>\n
Tolerances in injection moulded products are the result of the interplay between mould accuracy, material behaviour, and process settings. You can set the machine precisely, but if the mould itself has inaccuracies, these will be reflected in the product. An investment in mould quality is therefore a direct investment in product quality.<\/p>\n
At Euro-Techniek, after every injection moulding test, we measure the dimensions of the produced parts and compare them to the drawing. Deviations are fed back to the mould design or process setting. This is how we ensure that mould quality and product quality go hand in hand.<\/p>\n
That depends on the volume. For small batches, mould amortisation accounts for a large proportion of the unit price. For large volumes, the emphasis shifts to cycle time and material consumption. Good mould design reduces cycle time and reject rates, which has a directly measurable effect on the unit price at high volumes. As a rule of thumb, the higher the volume, the greater the influence of mould quality on total production costs.<\/p>\n
For volumes exceeding one hundred thousand units per year for a relatively simple product, a multi-cavity mould is almost always more cost-effective. The additional investment in tooling is quickly recouped through lower machine hours per unit. For complex products with numerous slides, the break-even volume is higher, as the tooling costs per cavity are also greater. We calculate this for each project based on your specific product and expected demand.<\/p>\n
It varies greatly. Small corrections, such as adjusting a runner or relocating a vent, cost a few hundred euros. Substantial modifications, such as moving a gate or adding a slider, can add up to a significant portion of the original mould price. This is precisely why investing in design review and simulation for the construction phase is always wiser than correcting afterwards.<\/p>\n
The choices you make in mould design affect every part you produce. From cycle time and unit cost to scrap rate and mould lifespan: it all starts with the mould. Anyone solely focused on tooling price is missing the bigger picture.<\/p>\n
View Euro-Techniek's injection moulding services or get in touch for a technical discussion about your mould project. We are happy to collaborate during the design phase, before costs are fixed.<\/p>","protected":false},"excerpt":{"rendered":"
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