Power Supply Enclosures CNC Machining for Cleanroom Equipment

Aluminum 5052-H32has excellent corrosion resistance, with 2.2 to 2.8 percent magnesium content allows for the formation of protective oxide layers, especially useful for cleanrooms with 30 to 50 percent humidity. Heavily chemically cleaned rooms do not hinder the maintained surface integrity. With a 193 MPa yield strength, it meets the structural requirements of the enclosures for the 20 to 100 kilograms of internal equipment mass. It possesses superior formability for the complex bent sheet metal designs, which allows for the formation of acute angles with bend radii of 1.5 to 3.0 times the material thickness and achieves dimensional accuracy of ±0.010 inches. Also, it has low particle generation characteristics with outgassing rates below 1×10⁻⁶ Torr·liter per second, which permits high-vacuum applications. Aluminum 6061-T6 has enhanced mechanical strength with ya yield strength of 276 MPa to support heavier internal components, 50 to 200 kilograms, and equipment mounting loads. It also has excellent thermal conductivity of 167 W/m·K, which helps to dissipate heat and maintain the ambient temperature rise below 15°C around internal power electronics. It also has excellent electromagnetic shielding with 40 to 60 dB across 10 kHz to 1 GHz when the seams and gaskets are properly designed.
Stainless steel 304 offers outstanding corrosion resistance to cleaning agents such as isopropyl alcohol and hydrogen peroxide in 3 to 30 percent concentrations, as well as deionized water, while preserving surface finishes Ra 0.4 to 0.8 microns after over 1000 cleaning cycles. It's also non-magnetic, which means it won't interfere with metrology equipment with field strengths below 0.5 gauss. Electropolishing is also possible to achieve surface roughness Ra 0.1 to 0.3 microns, which minimizes particle adhesion sites and facilitates cleaning validation according to FDA 21 CFR Part 211 for pharma applications, making it conform to various cleanroom and pharmaceutical application requirements. Stainless steel 316L provides additional corrosion resistance due to its molybdenum content, 2 to 3 percent for more aggressive chemical environments, which include cleanroom sanitization with peracetic acid and chlorine dioxide. Its low carbon content of below 0.03 percent also eliminates sensitization during welding, which eliminates intergranular corrosion. It also has biocompatibility, which meets USP Class VI requirements for biotechnology and life sciences applications.

From 300 to 1500 millimeter panels, 5-axis CNC machining centers create ventilation louvers, cable entry cutouts, and mounting bosses. With 3 to 20 mm solid carbide end mills, 12,000 to 24,000 RPM spindle CNC machining centers achieve enclosure fine features with ±0.005 inches dimensional accuracy. Laser cutting with 2 to 6 kilowatt fiber lasers allows CNC cuts to be performed with edge finishing Ra 3.2 to 6.3 microns, cutting speed 4 to 15 m/min, and eliminates secondary deburring for cut panels from 1.5 to 6.0 mm thick aluminum and 1.0 to 4.0 mm thick stainless steel. Ventilation grids, mounting features, and hole pattern punching at CNC turret 200 to 600 hits per minute with ±0.005 inches positional accuracy for standard holes 6 to 50 mm diameter. With CNC-controlled back gauge bending, precision press brakes achieve enclosure panel bending with angle accuracy ±0.5 degrees, internal radius 1.5 to 3.0 times the thickness of the material, flatness ±0.010 inches for 500 mm, and in different heights with measuring.
Seams on enclosures are fused using TIG welding and laser welding techniques. Weld penetrations are maintained at 1.0 to 3.0 millimeters with heat-affected zones at 2 to 5 millimeters, which preserves the properties of the base material. Automated welding cells with robotic manipulation are employed for high-volume production. 20 to 50 enclosures are produced per shift, and the quality of the welds is controlled and monitored using real-time current and voltage measurements.

Flatness tolerance for all panels within the 300-1000 mm range is 0.010 in. This is critical for maintaining the geometry of the gasket sealing area, which is 0.5 to 1.5 mm, as well as for the electromagnetic shield to close the gaps with contact resistance of less than 2.5 milliohms and withstand the MIL-DTL-83528. Mounting holes pattern for every 100-600 mm can achieve position tolerance of ±0.005 in holes, which helps the equipment frames and DIN rail-mounted systems to align properly. Additionally, end closure 90 degree corners hinge layout can maintain bend angle tolerance of ±0.5 degree, which helps to improve enclosure squareness as well as door fit-up gaps of 0.5 to 2.0 mm. Cutouts for display windows, connector panels, and ventilation openings have a ±0.008 in tolerance, ensuring proper mounting of components and respect of airflow performance. Edge straightness is ±0.015 in per 500 mm for 5 km on the straight part of a section of the enclosure. This, in turn, impacts the uniformity of sealing of the gasket and IP65 ingress protection sealing efficiency, which is achieved with the water spray test of 12.5 L/min. Critical sealing surfaces achieve flatness of 0.005 in and a Ra 1.6 to 3.2 micron finish. This is critical for the 10+ year- -10 to 60 degree compression set gasket to seal and perform reliably.

Yes, Zintilon offers rapid prototyping and limited production runs for cleanroom enclosures. Prototypes for cleanroom compatibility testing with particle count and EMI shielding measurements in calibrated test chambers and low-volume production runs of 50 to 500 enclosures for specialized semiconductor tools and pharmaceutical equipment, with complete dimensional reports and material certificates, take 2 to 4 weeks. Zintilon also offers high-volume production, 5,000 enclosures and more each year for mass-market cleanroom equipment and electronics manufacturing systems, complete with automated quality control systems. All production phases include coordinate measuring machine inspections with 0.005-millimeter repeatability, surface finishing with Ra 0.4 to 3.2 microns, and cleanroom compatibility, testing for MIL-STD-461 electromagnetic shielding effectiveness, and proving ingress protection via IEC 60529 test methods. Zintilon also controls internal particle generation with precise outgassing and surface shedding measurements. Enclosure dimensions comply with NEMA, IEC, and client specification standards to receive ISO 9001 certification. Zintilon also performs IC 60529 testing to validate ingress protection with dust exposure and water spray. Additionally, custom specifications are included for dimensional verification to ensure high quality according to ISO 9001 standards.

In all our processes, we comply with ISO 9001:2015 quality management system standards, meaning we have documented processes, traceability of materials, and controls for cleanroom compatibility. Enclosures comply with ISO 14644 standards for cleanrooms, which include environments of Class 1 to Class 100, and for particle generation rates of 0.5 microns for particles under 0.1 particles per cubic foot, and rated with IEC 60529’s ingress protection standards of IP54 to IP67 which was validated using dust chamber testing and water spray exposure testing of 12.5 to 100 liters per minute, and also with NEMA 250 standards for NEMA 1, 4, 4X, 12 enclosures for industrial applications. Furthermore, our enclosures comply with UL 50 and UL 508A standards for electrical enclosures and power distribution and control equipment, and also comply with MIL-STD-461 as well as electromagnetic compatibility for conducted and radiated emissions for CE102, CE106, and RE102 for radiated emissions. EMI shielding effectiveness was validated using IEEE 29,9, which showed attenuation of 40 to 100 dB for frequencies of 10 kHz to 18 GHz, also proven with FCC Part 15 Class A and Class B limits, and CISPR 25 standards for automotive EMC.
The certifications provided with the materials include mill test reports, which contain the breakdown of the alloys as well as the mechanical properties, verification of the given surface finish of Ra 0.1 to 6.3 microns depending on the requirements of the application, and conformance certificates for RoHS, REACH, and compliance with conflict minerals.

Among the finishing methods are electropolishing of stainless steel to achieve surface roughness of Ra 0.1 to 0.3 microns which reduces particle adhesion sites by 90 percent and improves cleanability for pharmaceutical Grade A/B cleanrooms per EU GMP Annex 1, Type II anodizing of aluminum enclosures to create an oxide layer of 5-25 microns thick which provides electrical insulation and corrosion resistance up to 1000 megohms in humid environments, foam epoxy or polyurethane powder coating to achieve 60-120 microns dry film thickness in cleanroom-compatible low-outgassing formulations with outgassing rates < 1×10⁻⁶ Torr·liter per second, chemical passivation of stainless steel per ASTM A967 to improve the stainless steel surface with corrosion resistance in sanitization cycles after cyclic corrosion testing and to create an additional chromium oxide layer of 2-4 nanometers thick and finally, conductive coatings of nickel or copper plating of 5-15 microns to enhance electromagnetic shielding by 10-20 dB for RF sensitive applications.
Special treatments include bead blasting to create a uniform surface texture of Ra 1.6 to 3.2 microns to improve coating adhesion and reduce glare in operator interface areas, laser etching to create permanent part identification and traceability markings that do not compromise surface cleanliness, and conductive gasket groove machining with width tolerance of ±0.005 inches and depth of 1.0 to 3.0 millimeters to ensure proper EMI gasket compression of 15 to 40 percent with shielding continuity, and contact resistance of less than 2.5 milliohms per linear inch.

If you order common-sized enclosures between 400 x 300 x 200 mm to 800 x 600 x 400 mm enclosures made from aluminum or stainless steel sheet metal enclosures with standard features and wall-mountable, it will take 4 to 6 weeks. This includes procurement of the materials, CNC laser cutting, bending, welding, finishing the surface, and quality check. With complex floor-standing cabinets, where thermal management systems are built, having several access panels and custom cable hook features takes 8 to 12 weeks. This is due to the precision fabrication and welding validation, and the special leak testing. For enclosures with surface finishing for prototypes used to develop clean room equipment or to qualify tools used in the semiconductor industry, it takes 2 to 3 weeks due to the rapid fabrication process. When it comes to large production orders, that is, over 2000 enclosures for high-volume equipment manufacturing programs, the first setup takes 10 to 14 weeks. This includes the tooling for progressive die operations, welding fixture fabrication, and first article inspection, which includes EMI testing along with cleanroom compatibility and tiered delivery in 200 to 1000-unit monthly batches.

Yes. We design "custom power supply enclosures" for 'thermally sc managed enclosures ' for 'cleanrooms'. We design fully integrated liquid-cooled heat exchangers for heat dissipation between 2 to 10 kW. We ensure that 30 to 45 °.C maintained for the innards of the enclosure. We design custom enclosures for Class 1 to Class 100 cleanrooms. We design enclosures for explosion-proof custom power supplies. We design enclosures in compliance with ATEX, IEC Ex, flame path dimensions, and limitations for surface temperatures. We prevent the ignition of flammable atmospheres. We design over 10,000 enclosures for hazardous locations, Zone 1 and Zone 2. We design ultra-high vacuum compatible enclosures with 316L electropolished stainless steel, which achieve outgassing rates lower than '1 x 10 -9 torr litters per second'. We work with a semiconductor process tool which operates in the vacuum of '1 x 10 -6 to 1 x 10 -9 torr'. We design modular enclosure systems. We incorporate standardized mounting rails and removable panels. We design so enclosures can be field reconfigured and eas maintained in 15 to 30 minutes, rather than 2 to 4 hours. We incorporate welded designs. We design Faraday cage enclosures, which achieve shielding effectiveness of over 100 dB for frequencies ranging from 100 MHz to 18 GHz. These enclosures are for metrology equipment and RF test systems. We depositive-pressure purged enclosures and maintain internal cleanliness to Class 1 standards. We do this using HEPA/ULP, air that is filtered at defined flow rates of 50 to 200 cubic feet per minute. We maintain a pressure differential of 10 to 30 Pascal. We maintain transparent polycarbonate windows with EMI shielding mesh of 40-60 dB. We maintain 70-85% optical transmission for visibility.
We design custom enclosthatwhich are biocompatible and made of pharma-grade materials as per the requirements. All surfaces are welded and construction crevice-free to lay within 0.5 micron max surface roughness. This is designed to meet cleaning validation per the FDA. We support sterile manufacturing operations in Grade A/B cleanrooms.

The flattening of the electromagnetic shield sealing surfaces to within 0.005 inches across contact areas 20 to 200 mm wide "optimizes" precision machining. This guarantees complete uniformity of conductive gasket compression (15 to 40%) and the shield continuity contact resistance of under 2.5 milliohms per linear inch. RF leakage is measured from the designed 80 dB to the real 40 dB at 100 MHz to 1GHz, proving the level of de minimis leakage of the designed shield is RF. The ±0.005 inch precision of hole placement for mounting patterns ensures equipalign with positional ±0.25 millimeters alignment limits along the ±0.5 millimeter optical axis in photolithography tools and the control of vibration transmission to within the 2 to 10 microns peak-to-peak specification limits.0.010-inch control of panel flatness is what ensures no gasket compression differences. Panel flatness controls the prevention of gasket compression differences, preventing seal leakage. 5 cleanroom classification degradation to ISO Class 7 is evidenced by the increase in 0.5 micron particle counts from 100 to 10,000 per cubic foot. The edge of the panels meets the Ra 0.4 to 3.2 micron specification as interior surfaces to reduce the generation sites of particles to increase bioburden for the pharmaceutical level. The bioburden level required for pharmaceutical applications is 100 colony-forming units per 100 square centimeters. The new level is 10 cfu.
Bend angle accuracy with ±0.5 degree fault tolerance maintains enclosure squareness, which ensures door alignment with 1.0 to 2.0 millimeter gaps and prevents EMI leakage through quadrants and non-dedicated EMI shielding asymmetrical apertures with leakage of 20 to 40 dB. This confirms contamination control and electromagnetic compatibility for a 10 to 15-year design life validated in 300 millimeter wafer semiconductor fabs, sterile injectable pharmaceuticals, mammalian cell culture biotechnology clean rooms, and electronics assembly for Class 10 to Class 10,000 environments with 5 to 100 kilowatt power distribution systems and 99.5 percent equipment uptime.