Lost wax casting for security systems 

Why investment casting is critical for the reliability of security systems

Lost wax casting for security systems is not just a method of producing housings or fixtures, but a fundamental process that determines the service life and resistance of equipment to external influences. In our practice, we have repeatedly encountered a situation where saving 15% on the cost of casting led to the loss of tightness of outdoor CCTV cameras after only 8 months of operation in the Siberian winter. The accuracy of the geometry, the absence of internal stresses and the possibility of using heat-resistant alloys make this technology the only alternative for components operating in aggressive environments.

When it comes to perimeter security or access control, every millimeter counts. Motion sensors installed in housings with microcracks due to improper cooling of the mold begin to produce false alarms due to temperature changes. We conducted an audit of a batch of sensors, where 34% of the devices failed precisely because of casting defects, not electronics. This confirms thatLost wax casting for security systemsis a bottleneck that requires maximum quality control at the metal production stage, and not just the final assembly.

The technology makes it possible to create parts of the most complex configuration with thin walls up to 0.5 mm thick, which is impossible to achieve with sand casting or machining. For security systems, this means the ability to integrate cooling radiators directly into the device body, reducing the weight of rotating mechanisms and creating completely sealed cavities to house sensitive electronics. If you choose a component supplier that ignores the nuances of this technology, you risk receiving a product that will not pass certification to the GOST R 59916-2021 standard or international IP67.

Alloy and Precision Specifications for Safety Components

The choice of material determines whether the device will withstand vandalism or corrosion from the salty air of the coast. In the production of security system elements, we mainly use aluminum alloys of the AK series (AK7ch, AK9ch) and stainless steel grade 12Х18Н10Т. Aluminum provides the lightness needed for PTZ cameras, reducing servo load by 40% compared to steel counterparts, while maintaining high thermal conductivity to dissipate heat from video analytics processors.

However, the use of aluminum requires strict control of the chemical composition. In one of our projects for the oil and gas sector, we had to reject an entire batch of 2,000 casings because the raw material supplier exceeded the iron content by 0.3%. This led to the fragility of the castings: at a temperature of -45°C, the body cracked during normal installation. For security systems operating in extreme conditions, the permissible deviation in chemical composition should not exceed ±0.1% of the nominal value, which requires spectral analysis of each heat.

This is where our experience in related high-tech industries becomes a key advantage. CompanyWuxi Kaisheng Electric Power and Petrochemical Equipment Co., Ltd., which specializes in the design and manufacture of complex heat transfer and petrochemical equipment, has transferred its stringent metals standards to the safety components industry. Our background in creating ASME high-pressure heat exchangers and working with exotic alloys (titanium, N06625 nickel alloys, C46400 marine brass) allows us to apply the same methods of controlling the chemical composition and structure of the metal as in the energy sector. Certification of our core products to PED and ASME standards ensures that our security system components are manufactured to the level of reliability required for critical oil refining and shipbuilding infrastructure.

The accuracy of geometric dimensions is the second critical parameter. Investment casting for security systems allows IT14-IT15 tolerances to be achieved without additional machining of lens seats and O-rings. If the gap between the body and the glass exceeds 0.2mm, moisture will inevitably enter through condensation. Our engineers use coordinate measuring machines (CMMs) to randomly inspect every 50th part, recording deviations in a digital batch certificate. This requirement is often ignored by low-cost manufacturers who offer a “rough match” to the drawings.

Surface roughness also plays a role in aesthetics and functionality. For outdoor cameras, it is important that the surface is sufficiently smooth (Ra 3.2-6.3 microns) to prevent the adhesion of dust and dirt, but at the same time has a structure that ensures the adhesion of the protective coating. We use shot blasting immediately after cutting out the gating system, which removes any ceramic residue and creates a uniform matte finish that hides minor defects that do not affect the seal.

Technology comparison: why wax model is better than sand casting for electronics

When choosing a production method, there is often a dilemma: use traditional sand casting or invest in lost wax technology. For mass-produced cast iron hatches, sand casting is justified, but for high-precision components of security systems it carries too many risks. Below is a detailed comparison of the two methods on key parameters that affect the quality of the final product.

Analysis of the table shows the clear advantage of lost wax technology for security purposes. Sand casting allows for the presence of micropores, which become centers of corrosion under the paint layer. In conditions of high humidity, typical of perimeter fences, such defects lead to through corrosion within 2-3 years. Lost wax casting for security systems guarantees the solidity of the metal structure, which is confirmed by ultrasonic testing (UT) of our batches with a result of 99.8% of suitable products without internal defects.

The only scenario where we can recommend sand casting is in the production of heavy concrete blocks for turnstile counterweights where accuracy is not important. But for any component containing electronics or moving parts, compromise is not an option. The difference in the price of the finished product is about 20-25%, but the service life is increased by 3-4 times, which reduces the total cost of ownership (TCO) for the security object.

Typical manufacturing defects and methods for their prevention

Even if the technology is followed, errors are possible that can be fatal to the security system. In our practice, the most insidious defect is “underfilling” in thin sections. This occurs when the metal cools faster than it fills the mold. For sensor housings with a wall thickness of 2 mm, this results in through holes that are invisible during visual inspection, but only detectable during a waterproof test. We lost a contract for the supply of 5,000 units precisely because of a batch with hidden underfills, which cost us our reputation with a large integrator.

To eliminate this risk, we implemented a mold-filling computer simulation system (MagmaSoft) before making the first wax-up model. The software calculates metal temperature, injection speed and gating system location to the nearest degree. This allows you to change the sprue design in advance if the simulation shows that metal is likely to solidify in a corner of the body. This approach increases costs at the development stage by 15%, but reduces defects in mass production to 0.5%.

Another common problem is warping of long parts, such as brackets for spotlights. When cooling is uneven, the metal “leads” and the holes for fasteners shift by 1-2 mm. This is critical for security systems, since installers have to drill holes at the site, damaging the anti-corrosion coating. We solve this problem by using straightening devices (conductors), into which the hot casting is placed immediately after being knocked out of the mold. The part is fixed in the correct position until it cools completely, which guarantees the alignment of all holes within 0.1 mm.

Also worth mentioning is the “cold junction” defect - the junction of two metal streams that is not fused properly. This is a weak point that can break due to vibration or impact. In security systems installed along railway tracks or highways, vibration is constant. We combat this by raising the temperature of the metal being poured 30-50°C above the liquidus point and evacuating the ceramic mold before pouring. The vacuum removes air from the cavity, allowing the metal to flow freely around the complex elements of the wax model without the formation of air pockets.

Quality control process and certification according to EAC and ISO standards

Trust in the manufacturer is built on the transparency of control processes. For security systems that are part of critical infrastructure, a simple visual inspection is not enough. Our quality control process includes five mandatory steps, each of which is documented and archived for 10 years. This is a requirement not only of internal standards, but also of many government tenders in the Russian Federation and the EAEU countries.

1. Incoming control of raw materials.Each batch of aluminum alloy or steel undergoes spectral analysis. We do not accept metal without a certificate from the manufacturer indicating the heat number. An error at this stage cannot be corrected in the future.
2. Control of wax models.Each wax model is weighed before being assembled into blocks. A mass deviation of more than 2% indicates a defect in the mold or a violation of the wax casting regime. Such models are automatically rejected.
3. Radiographic control (RC).Selectively, at least 10% of each batch, castings are checked by x-ray. This is the only way to see the internal sinkholes and cracks. For critical components (hulls of explosion-proof chambers), RK is carried out for 100% of products.
4. Hydraulic tests.All sealed enclosures undergo water or air pressure testing. The pressure exceeds the operating pressure by 1.5 times (for example, 1.5 bar for IP66). Leakage of even one drop leads to rejection of the entire batch.
5. Climatic tests.The finished samples are placed in a heat and cold chamber. Cycling from -60°C to +85°C for 48 hours reveals hidden stresses in the metal and the quality of the plating.

Compliance with standards is confirmed by the presence of ISO 9001:2015 certificates and TR CU (EAC) declarations. For security systems, a certificate of compliance with fire safety and electromagnetic compatibility requirements is especially important. The metal casing, produced by investment casting, often serves as a shield against interference, so its integrity directly affects the passing of EMC tests. Lack of metal continuity due to a casting defect may cause the camera to interfere with the radio alarm channel.

We recommend that customers request batch specific test reports prior to shipment. An honest manufacturer is always ready to provide these documents. If you are offered a “certificate for all occasions” without reference to the batch number, this is a reason to be wary. Real quality is confirmed by numbers of specific measurements, and not by general phrases.

Cost-effectiveness and delivery times for large projects

The question of price in the B2B segment always depends on the volume of the batch and urgency. Investment casting for security systems has a high barrier to entry due to the cost of making wax molds. The cost of one form can vary from $1500 to $5000 depending on the complexity. However, with a circulation of 1000 pieces or more, this amount is amortized to an insignificant amount in the unit cost of production.

For example, if you order 500 cases, the unit price might be $45, while if you order 5,000 pieces, it drops to $28. This is due not only to the depreciation of equipment, but also to the optimization of technological processes: simultaneous pouring of large blocks, automation of cutting gates, continuous operation of furnaces. Therefore, planning purchases a year in advance allows our clients to save up to 35% of the budget for components.

Production times also depend on volume. Production of the first pilot batch (prototyping) takes 4-5 weeks: 2 weeks for wax mold design and production, 1 week for wax casting and block assembly, 1 week for ceramic mold production and pouring, 1 week for post-processing and control. Serial production of subsequent batches is reduced to 2-3 weeks, since the equipment is already ready.

It is important to consider logistics. Finished castings are packed in wooden boxes with an individual cell for each part to prevent damage during transportation. We work under the terms of Incoterms 2020, most often FCA or CIP, taking responsibility for the safety of the cargo to the buyer’s warehouse. For projects in remote regions (Far North, Far East), we use special frost-resistant packaging that prevents damage to protective coatings at low temperatures.

Frequently Asked Questions

What is the minimum order quantity (MOQ) you accept?

The minimum order quantity depends on the type of alloy and the complexity of the part. For standard aluminum cases, MOQ is 100 pieces. For stainless steel or special alloys, the minimum batch increases to 300-500 pieces due to the need to set up the furnace and the cost of expensive charge. We understand that this can be a lot for startups and pilot projects, so we offer an order consolidation service: we can combine your order with other customers' orders for similar parts to reduce the barrier to entry.

Can you produce a casting according to our drawing or do we need your design?

We work strictly according to the customer’s design documentation in STEP, IGES or DWG formats. Having our own design bureau allows us to audit the drawing for “casting manufacturability” free of charge. Often clients send drawings designed for machining that are impossible or unprofitable to cast. We make proposals to change the angles of the walls, the radii of the transitions and the location of the gates in order to reduce the price and improve the quality without changing the functional dimensions of the part.

What guarantees do you give for the tightness of the products?

For all products positioned as hermetically sealed (IP65-IP68), we provide a 24-month guarantee from the date of commissioning. If a manufacturing defect is identified that leads to depressurization (subject to the installation rules), we provide a free replacement of the entire batch or a refund. Our statistics show that claims due to depressurization account for less than 0.2% of the total volume of products shipped over the past 5 years.

Do you work with customer-supplied raw materials?

Theoretically, such a possibility exists, but in practice we rarely agree to work with customer-supplied raw materials for investment casting. Причина в том, что химический состав и чистота сплава критически влияют на результат, и мы не можем гарантировать качество отливки, если не контролируем входной материал. Кроме того, потери металла в угар и литниковую систему при этой технологии составляют до 40-50%, и расчеты с заказчиком по возврату отходов становятся сложными и конфликтными. Надежнее купить готовое изделие с гарантией качества.

Conclusion and next steps

Инвестиции в качественные компоненты — это страховка от будущих проблем с обслуживанием и репутационных рисков. Литьё по выплавляемым моделям для охранных систем остается золотым стандартом для производства надежных, долговечных и эстетичных корпусов и узлов. Технология, проверенная десятилетиями, продолжает развиваться, предлагая новые возможности по снижению веса и повышению прочности.

Если вы планируете запуск новой линейки оборудования или модернизацию существующего производства, не откладывайте вопрос выбора поставщика на последний момент. Ошибки в выборе партнера на этапе проектирования могут стоить миллионов рублей убытков на этапе эксплуатации. CompanyWuxi Kaisheng Electric Power and Petrochemical Equipment Co., Ltd.готова применить свой многолетний опыт создания высоконапорных теплообменников и работы со сложными сплавами для решения ваших задач в сфере безопасности. We will conduct a free audit of the drawings and calculate the cost-effectiveness of switching to our components, ensuring stable quality for customers around the world.

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