A buyer in Nagoya, Japan working on semiconductor equipment has a thin perforated electrode plate where every hole exit carries a burr and the plate cannot tolerate distortion. SurfacePolish supplies vibratory and related finishing equipment, media and compounds across borders, and runs a free sample trial: parts go to Xiamen and come back with observed results and a proposed processing direction for the buyer's engineering team. This brief is written for a buyer in Nagoya working on semiconductor equipment; it describes equipment, media and a scoped sample review, not a local polishing service.
Which cleanliness method and limit does the buyer own, and is it applied before or after the buyer's own cleaning step?
Can the required finish be reached in one mechanical route, or does the part need a cut stage followed by a refinement stage?
What is the smallest internal passage, slot or hole the charge must not plug, and how will a lodged medium be detected and removed?
Batch composition is a process variable, not a logistics detail. Mixing a 4 kg chamber lid with a handful of small stainless fittings changes media circulation, the cycle energy per part and the contact pattern between parts. Delicate electrode plates and thin-wall liners can be dented by heavier neighbours, and aluminium fines released in one batch can transfer onto stainless parts in the next unless the charge and the machine are cleaned between material families. Decide the part mix, the maximum mass per batch and whether fragile parts need racking or compartmentalisation. Decide also how batches are identified, with a traveller that carries material, media charge, compound, cycle time and operator, so a finishing result can be traced back to the settings that produced it. Batch identity is the basis for any later comparison.
Steel media produces a bright, burnished appearance and high contact pressure, and it is usually paired with a corrosion-inhibiting compound. On semiconductor equipment parts it belongs mainly on stainless items where appearance and edge blending matter, and it should be treated with caution on aluminium, where steel can transfer iron and leave rust spotting or embedded fragments that later appear as particles or staining. Separation at unload is critical: steel media is dense, is easily retained in blind holes and slots, and can be recovered magnetically only if the equipment is set up for that. Steel charges also need their own containment and cleaning discipline to keep ferrous contamination out of aluminium work. A bright result from a steel charge is an observation about a surface, not evidence about cleanliness or suitability for a process environment.
| Media | Best fit | Watch out for |
|---|---|---|
| Heavy-cut ceramic, angle-cut triangles in a coarse size class | Removing a substantial machining burr from open external edges and pockets on aluminium and stainless housings before a refinement stage | Cuts edges and corners aggressively, leaves a coarse surface, and lodges in slots whose width approaches the media section |
| Plastic triangles and pyramids in a soft to medium grade | Deburring aluminium and other soft alloys where surface marking and edge rounding must be kept to a minimum | Slow cut rate, media deforms and wears, and a worn charge behaves noticeably differently from a fresh one |
| Aluminium oxide grinding media in a dense ceramic bond | Where a heavier stock removal or a more consistent cut is needed on robust stainless parts with thick edges | High removal energy rounds functional edges quickly and is a poor match for thin aluminium plates or knife-edge seal lands |
| Fine ceramic or porcelain spheres in a small size class | Refinement and light edge blending after a cutting stage, and reaching tighter external geometry on chamber bodies and plates | Small sizes enter and retain in gas passages and fine slots; media wear shrinks the charge and changes the finish over its life |
Magnetic finishing uses a small charge of pin-shaped or fine media driven by a moving magnetic field, which lets it reach narrow gaps, small bores and fine internal radii that tumbling media cannot enter. For semiconductor equipment parts it is most relevant on small precise items: gas nozzles, orifice plates, small machined inserts and fine slot arrays where the requirement is deburring and light refinement rather than bulk stock removal. The working envelope is small, so chamber bodies and long gas lines are out of scope. The media pins themselves are a lodging risk in the same features they are chosen to reach, and they are difficult to see inside a closed passage. Magnetic finishing also leaves a different surface signature from tumbling, so a roughness figure obtained on one route cannot be assumed to transfer to another.
| Machine route | Where it fits | What it will not do |
|---|---|---|
| Magnetic finishing machine | Fine deburring and light refinement of small precise features such as nozzles, orifice plates and narrow slots | Small working envelope that excludes chamber bodies and long gas lines, with pin media that can lodge in fine passages |
| Grinding finishing machine | Taking off a heavy machining burr or a defined stock layer before a refinement pass on robust stainless work | High removal energy cuts functional edges fast and demands a tighter geometry assessment and shorter cycles |
| Vibratory finishing machine (bowl) | General deburring and refinement of chamber bodies, plates and housings that fit and can tumble without racking, with easy mid-cycle inspection | Continuous part-on-part contact and no access to deep internal passages; thin plates and finished mating faces need separation |
| Tub vibrator | Long gas rails, tubular manifolds, weldments and linear electrode assemblies that cannot rotate in a bowl | Lower energy per unit area so heavy burrs take longer, and large tubs need floor space and a suitable part support method |
Compound film, media dust and embedded particles on a sealing face are the failure mode that most often forces a semiconductor equipment part back through cleaning or into scrap. The face may look acceptable under shop light while carrying a tenacious silicate film, a smear of aluminium, or fine ceramic debris forced into a soft surface. Impingement can also peen media fragments into aluminium, which is difficult to detect without magnification or a wipe test. Likely causes include too little rinse, a compound that forms a film, insufficient separation after the cycle, and drying a part before it is genuinely clean. Inspection should combine magnification of the sealing land, a solvent wipe over a defined area, and the buyer's own cleanliness method. Surface finish alone is not evidence that a face is free of residue.
| Failure mode | Likely cause | How to catch it |
|---|---|---|
| Thin plate or liner distorted, bowed or dimensionally drifted after the cycle | Tumbling load on an unsupported thin section, part-on-part contact, or heat and pressure from a high-energy route | Measure flatness, wall thickness and critical dimensions at the same marked points as the pre-process baseline, using a CMM or surface plate and gauge |
| Tapped threads rounded, galled or opened out by edge finishing | Media working the thread crest during a long or high-energy cycle, with no plugging or masking on the hole | Run a go and no-go thread gauge on every sampled hole, inspect crest condition at magnification, and confirm that plugs or masks were used and removed |
| Grey aluminium smear transferred onto stainless parts in a shared batch | Aluminium fines retained in media, compound or the machine after an aluminium lot, with no purge before the stainless lot | Check stainless surfaces under angled light for a dull grey film, review the changeover record, and inspect the charge and machine sump for retained fines |
| Compound film or tenacious residue left on a sealing face | A film-forming or silicate-bearing compound, insufficient rinse volume, or drying the part before it is genuinely clean | Magnify the sealing land and wipe a defined area with solvent, comparing the wipe against a clean reference; confirm with the buyer's own cleanliness method |
Nagoya anchors one of Japan's three major economic zones, an area the city describes as built on 'manufacturing industries' such as ceramics, automobiles and machine tools. Nagoya City's own industry report states that Aichi Prefecture's value of manufactured goods shipments was 47,894.6 billion yen in 2021, 14.5 per cent of the national total, holding first place among prefectures for 45 consecutive years since 1977. The city publishes the annual 'Industry of Nagoya' report covering manufacturing, wholesale and retail trade, services and trade through Nagoya Port and Chubu Centrair International Airport, and its industrial vision to 2028 sets out startup, SME resilience and human-capital programmes. The region is served by Nagoya Port, which the port authority says has become first in Japan for total cargo handled.
The nearest part of that base to this brief is machinery: Nagoya City's industry report lists machine tools alongside automobiles and ceramics among the manufacturing industries on which the Nagoya area economy was built.
The Nagoya area's automotive and machine-tool base runs on high-volume, high-tolerance parts, where burrs and edge condition affect assembly fit, fatigue behaviour and the cleanliness of subsequent heat treatment, coating or washing steps. Aerospace work adds a certification dimension: Nagoya City has funded support specifically for maintaining aerospace industry certification, so surface and process records must survive audit as well as meet the drawing.
A Nagoya buyer should establish whether the finishing operation is inside or outside its quality-system scope, because automotive and aerospace customers here audit process records and certification, not only the delivered surface.
Freight context: Port of Nagoya (名古屋港) — first in Japan for total cargo handled, with terminals under the Nagoya Port Authority, Chubu Centrair International Airport (中部国際空港), opened 2005. The Nagoya Port Authority states that the port, open since 10 November 1907, has developed as the logistics backbone of manufacturing industry in the Chubu region and is now first in Japan for total cargo handled. Nagoya City's industry report records Nagoya Port's 2023 trade value at 22,512.3 billion yen, up 5.2 per cent year on year, and the port authority publishes monthly and annual statistics series for freight planning.
The customs authority is Japan Customs, the Customs and Tariff Bureau of the Ministry of Finance, with regional customs at Tokyo, Yokohama, Nagoya, Osaka and Kobe. Any person importing goods must declare them to the Director-General of Customs and obtain an import permit after examination and payment of customs duty and consumption tax. The declaration is normally filed by the importer or by a customs broker acting as proxy, on a triplicate import (customs duty payment) declaration form (Customs form C-5020) supported by the invoice, the bill of lading or air waybill, a certificate of origin where a WTO rate applies, certificates of origin for preferential rates, packing lists and freight and insurance documents where required, plus any licence or certificate demanded by laws other than the Customs Law. More than 90 per cent of import procedures are computerised. A JIS Mark certificate is a separate, voluntary third-party scheme; foreign exporters are eligible to apply, and certification bodies must comply with ISO/IEC 17065.
Documentation and technical communication are Japanese-language in practice: JISC states that the documents submitted for JIS certification-body accreditation must be written in Japanese, and drawings, inspection sheets and purchase specifications from Japanese buyers are normally issued in Japanese. Import declarations are filed in triplicate and importers commonly use licensed customs brokers, so the commercial invoice, packing list and origin documents must be complete and consistent with the declared commodity code. As general industry practice in Japan, industrial buyers qualify a supplier on documentation, quality-management evidence and a defined inspection standard before volume orders, and expect a named Japanese-speaking contact for technical and commercial follow-up.
SurfacePolish supplies from Xiamen, China. The buyer's own destination rules, conformity marking, tariff classification and documentation responsibilities stay with the buyer; confirm them against the authorities named above before ordering.
Functional checks catch the failures that visual inspection and roughness measurement miss. On a vacuum part that means the buyer's own leak test on the assembled component, which is the only way to see a seal land that has been rounded or a residue film that opens a virtual leak path. On a gas line it means a flow check against a reference part, since an internal burr or a lodged medium changes conductance. Dimensional verification belongs on a CMM or with hand gauges at the features that can move: slot widths, bore diameters, flange flatness, position of dowel holes and wall thickness on thin parts. Thread gauges confirm that a tapped hole was not rounded out by edge finishing. These checks are performed by the buyer's quality function against the buyer's limits; a finishing report is supporting evidence, not a qualification.
A sample trial answers a narrow question: what happened to these parts under these settings on this equipment. It does not prove that a production lot will be uniform, because bowl size, load ratio, media age and operator practice all shift the outcome. It does not establish a particle count, a cleanliness level or fitness for a cleanroom or any regulated process environment, and it does not transfer a roughness value from a coupon to a complex geometry. It cannot guarantee a cycle time, a cost per part, a capacity or a delivery schedule, and it does not qualify a machine, medium or compound for a semiconductor application. Treat the returned parts and the settings record as evidence for the buyer's own engineering decision, and plan the production route with its own first-article and sampling discipline.
A batch record should identify what was done rather than simply assert a result. Ask for part numbers and quantities, the machine used, the media type and size class, charge mass and age since the last screen, the compound and dose, the rinse water source, cycle time, inspection results and the lot disposition. Request the media and compound data sheets offered by the supplier. Where aluminium and stainless are processed on the same site, ask for the changeover note covering media purge, machine cleaning and compound replacement. This is finishing process documentation, not a certificate of compliance, and it supports your own traceability in Japan.
Mechanical mass finishing and electropolishing are different processes with different effects, and SurfacePolish does not supply or perform electropolishing. A mechanical route can deburr and refine a surface, and it may reduce the reason to consider an electrochemical step, but it does not reproduce what electropolishing does to a surface. The honest comparison is to define what the gas line actually requires, then test whether a mechanical route can observe those requirements on representative parts. Where an electrochemical finish is mandatory in your specification, that requirement stays with your own supply chain. This page treats electropolishing only as a comparison point and as a reason to evaluate a mechanical alternative.
A pump housing is usually assessed on external edges, bore condition and appearance, and a slightly rounded edge is often acceptable. A chamber component is assessed on small functional surfaces: a seal land that must not round, a gas passage that must stay clear, a locating bore that sets position. That shifts the whole process toward smaller media, gentler energy, more masking and fixturing, and a defined cleanliness step. It also shifts acceptance from a visual judgement to measurements at named features. If a shop quotes both parts the same way, the finishing route is probably being chosen by part size rather than by what the surfaces actually do.
Use Nagoya, Japan as the destination on the enquiry and state whether the deliverable is equipment, media and compound, a representative sample review or a line concept. A destination does not imply local stock, a local service point or a local delivery time.
Nagoya buyers work to JIS, maintained by the Japanese Industrial Standards Committee, whose mechanical engineering, ferrous materials and aircraft and aviation divisions cover the parts made in this region, with the JIS Mark scheme available for third-party product certification. Aerospace suppliers additionally carry industry certification that Nagoya City has supported maintaining, so finishing processes are documented against both the drawing and the customer's quality system.
Sources were retrieved on 2026-09-29 and describe the local industrial and trade context only. They do not evidence any SurfacePolish project, shipment, installation or service in Nagoya.
The buyer must deburr hundreds of hole exits on a thin plate without warping it or driving media fragments into the holes.
Send the material, dimensions, approximate weight, batch quantity, the incoming condition and photographs of the difficult features. Mark which features must not be contacted by media and state how the result will be inspected. This form carries source reference PSEO-0825; quote it if you prefer an additional manual reference.
Open the SurfacePolish enquiry form Email a prepared enquiry
No price, lead time, certification or result is promised here. Confirm whether a sample trial is available for the specific part and what the trial can and cannot show.
Page PSEO-0825 · revised 2026-09-29 · cross-border equipment, media and scoped sample review. City context is sourced and cited above.
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