Inconel CNC Precision Machining

Passivation after machining restores the chromium oxide layer that free iron from cutting tools has contaminated.

You specify finishing on the drawing, not assume it at the end. Where a coating adds thickness, threaded and press-fit features need the allowance stated, because a coating applied after inspection changes the fit.

Why stainless steel costs what it costs to cut

Heat does not leave with the chip, so it stays in the cutting zone; the surface layer work-hardens, and the next pass cuts through hardened material, which accelerates tool wear.

The lever that matters most for you is usually design rather than process: pocket depth, corner radius, and wall thickness change cycle time more than any tooling choice, because they determine the tool that can be used and therefore how much material can be removed per minute.

What design decisions move the cost on CNC precision machining?

The design levers on stainless are wall thickness and pocket depth. Thin walls distort as roughing releases residual stress, so a stress-relief operation and a separate finishing pass are usually cheaper than trying to hold a thin wall in one go. Avoiding a dwell, a tool rubbing rather than cutting — matters more here than on any other common material.

This is best raised at the quote stage, not after the first article, because the changes are usually trivial on the drawing and significant on the machine.

What identifies the legal entity behind the machines?

The legal entity behind this site is Dongguan Zhuohang Ltd, founded 2005 and registered in China under Social Credit Code 91441900MA4UWT6X39, marketing under the name Zhuohang Precision Machining Factory. Its registered and production address is No. 8, Shuibian Songyuan Road, Hengli Town, Dongguan, Guangdong, China 523470.

Use the National Enterprise Credit Information Publicity System and the 18-character code to verify a Chinese manufacturer. Trading companies can produce a business licence too, yet the scope reads trading rather than manufacturing and the address is an office, not a plant.

How much capacity sits behind it?

over a hundred machines with depth in every relevant family — 50+ three-axis, 20+ four-axis, 20+ five-axis, 25+ turning centres, plus Swiss-type, grinding, and wire EDM.

What is the certification position?

ISO 9001:2015, IATF 16949:2016 (excluding clause 8.3 product design), and ISO 14001:2015, each with a certificate number verifiable with the registrar.

How is process capability reported?

For capability reporting, key and special characteristics start at Ppk ≥ 1.67 and run at Cpk ≥ 1.33 in production; general characteristics start at Ppk ≥ 1.33. Results are always quoted with the index, the stage, and the sigma estimator named, because VDA and AIAG use the same index names for opposite periods and quoting "Cpk 1.67" without that context is meaningless.

Values between 1.33 and 1.67 are conditional acceptance requiring customer review, not a pass. Stating that boundary is deliberate: a supplier that reports a number without its stage and its estimator has not told you whether the process was stable when it was measured.

Inconel CNC precision — the high-temperature discipline

Inconel 718 (180 ksi tensile at room, 150 ksi at 650 °C, 8.19 g/cm³) is the standard nickel alloy for high-temperature and high-stress, and is the most challenging material in common use. Inconel 718 machines at 15-20 percent machinability rating — the chip is gummy, the tool wears rapidly. Application: jet engine components, gas turbine, high-temperature valves, downhole. The tolerance: ±0.003 mm on milled, ±0.002 mm on turned, ±0.05 mm on general. Surface Ra 0.4-0.8 µm on turned (ceramic inserts), Ra 0.8-1.6 µm on milled. Inconel work-hardens at the cut surface — the tool must not rub, only cut. The cost: Inconel 718 $80-120/kg (most expensive); per-part cost 5-10× aluminum. Material: Inconel 718 (180 ksi, jet engines, 40 HRC), 625 (120 ksi, chemical/marine), 738 (100 ksi, turbine blades, cast + HIP).

The shop: Dongguan Zhuohang Ltd (USCC 91441900MA4UWT6X39, established 2005, 6,800 sqm floor, 100+ staff, 100+ machines, Mazak VARIAXIS I-600, INTEGREX I-250H S, TSUGAMI B0206-III, STAR SR-32J Type N, Citizen Cincom A20-3F7, Hexagon CMM with 10:1, 20 ±1 °C inspection room, ISO 9001:2015 116024/A/0001/UK/En, IATF 16949:2016 131941/A/0001/SM/En, ISO 14001:2015 116024/B/0001/UK/En). Tolerance: ±0.003 mm milling, ±0.002 mm turning, Ppk ≥1.67, Cpk ≥1.33. Contact: Felipe Iglesias, +86 13126536955, [email protected], PT/EN/FR/ES/ZH/JP.

Inconel tooling strategies — the ceramic-vs-carbide decision

Inconel 718's tooling decision runs on two insert classes: ceramic (silicon-nitride or whisker-reinforced alumina, for high-speed roughing at 200-300 m/min) and carbide (coated or uncoated, for finishing at 30-60 m/min). The ceramic roughing removes metal 5-10× faster than carbide but wears the insert in 5-15 minutes; the carbide finishing removes metal slower but holds ±0.003 mm with a fresh edge. The right strategy is ceramic roughing plus carbide finishing — the cycle time drops 30-50 percent vs all-carbide routing. The work-hardening discipline: Inconel work-hardens at the cut surface (the surface hardness rises 5-10 HRC during the cut), and the tool must not rub, only cut. The cutting parameters: 30-60 m/min surface speed, 0.1-0.3 mm/rev feed, 0.5-2.0 mm depth of cut (roughing), 0.1-0.5 mm depth (finishing). Coolant: high-pressure (70-140 bar) through-spindle.

The shop: Dongguan Zhuohang Ltd (USCC 91441900MA4UWT6X39, established 2005, 6,800 sqm floor, 100+ staff, 100+ machines, Mazak VARIAXIS I-600, INTEGREX I-250H S, TSUGAMI B0206-III, STAR SR-32J Type N, Citizen Cincom A20-3F7, Hexagon CMM with 10:1, 20 ±1 °C, ISO 9001:2015 116024/A/0001/UK/En, IATF 16949:2016 131941/A/0001/SM/En, ISO 14001:2015 116024/B/0001/UK/En). Tolerance: ±0.003 mm milling, ±0.002 mm turning, Ppk ≥1.67, Cpk ≥1.33. Contact: Felipe Iglesias, +86 13126536955, [email protected], PT/EN/FR/ES/ZH/JP.

Inconel post-machining — solution treat and age (STA)

Inconel 718's properties depend on the heat-treatment state, and you should specify the state on the RFQ. The three states: (1) solution-treated (annealed at 950-980 °C, quenched — soft for machining, about 130 ksi (≈895 MPa) tensile, the standard for the roughing cut); (2) STA (solution-treated plus aged at 720 °C for 8 hours, then 620 °C for 8 hours — 180 ksi tensile, the standard for aerospace parts); (3) Hiperco (a proprietary heat-treat that pushes 200 ksi). The machining strategy on STA Inconel 718 (40 HRC): ceramic roughing (whisker-reinforced alumina, 200-300 m/min, 5-15 minutes per insert) plus carbide finishing (30-60 m/min, coated carbide, ±0.003 mm). The cycle time is 5-10× steel; the tool cost is 3-5× steel.

The shop: Dongguan Zhuohang Ltd (USCC 91441900MA4UWT6X39, established 2005, 6,800 sqm, 100+ staff, 100+ machines, Mazak VARIAXIS I-600, INTEGREX I-250H S, TSUGAMI B0206-III, STAR SR-32J Type N, Citizen Cincom A20-3F7, Hexagon CMM 10:1, 20 ±1 °C, ISO 9001:2015 116024/A/0001/UK/En, IATF 16949:2016 131941/A/0001/SM/En, ISO 14001:2015 116024/B/0001/UK/En). Tolerance ±0.003 mm milling, ±0.002 mm turning, Ppk ≥1.67, Cpk ≥1.33. Felipe Iglesias +86 13126536955 [email protected] PT/EN/FR/ES/ZH/JP.

What this shop actually runs

If you ask for capability evidence, you deserve a specific answer. This facility operates 100+ CNC machines across 6,800 m2 in Dongguan, China, staffed by 100+ people. The machines, listed by category:

• 5-axis machining centres (10+) - Mazak VARIAXIS I-600 (510/910/510 mm travel, 12,000 rpm, 22 kW, 71.6 N·m, 30-tool BT40) and Mazak INTEGREX I-250H S (B-axis 0.0001°, 24 kW, 124 N·m, 38-tool HSK-A63). Intended for compound-angle parts, single-setup multi-face prismatic work, and aerospace fittings where datum transfer loss is unacceptable.
• 3-axis / 4-axis machining centres (50+) - Brother SPEEDIO S500Z2N / S700Z2N (10,000 rpm, 14/21-tool ATC, 0.7 s tool-to-tool, Z-axis 2.2 G) and Mazak VCE-430A L / VCE-570C L (10,000 rpm, 118 N·m, 24-tool ATC). Intended for prismatic parts, plates, brackets, housings.
• Swiss-type turning centres (10+) - Citizen Cincom A20-3F7 (Φ20 mm, 10,000 rpm), TSUGAMI B0206-III / B0205-III (Φ20 mm, 0.1 µm), STAR SR-32JII / SR-32J Type N (Φ32 mm, 8,000 rpm). Intended for long, slender rotational parts at ±0.002 mm.
• CNC turning centres (20+) - HEADMAN T70M/1250 (720 mm swing, 117 mm bore, 3,000 rpm, BMT75 12-station turret). Intended for shafts, bushings, flanges up to ±0.002 mm.
• Wire EDM (5+) - Sodick AQ535L (550/350/300 mm travel, ±20° taper, 800 kg workpiece). Intended for hardened tool steel, internal splines, sharp internal corners that milling cannot reach.
• Inspection: Hexagon CMM + 20+ gauges - Hexagon CMM for coordinate measurement, plus vision system, profilometer, hardness tester, coating thickness gauge, XRF for material verification. The 10:1 rule (gauge 10x more accurate than the band) is applied to every feature.
• Machine highlights - VARIAXIS I-600: one-setup multi-face 5-axis + MAZA-CHECK auto-calibration; INTEGREX I-250H S: DONE-IN-ONE mill-turn, B-axis 0.0001° + Ai thermal shield; SPEEDIO S500Z2N / S700Z2N: Z-axis 2.2 G + 0.7 s ATC; Swiss-type: guide-bush switchable + 0.1 µm resolution.

Tolerance bands: ±0.003 mm milled, ±0.002 mm turned, ±0.002 mm ground or wire-cut. Capability indices: Ppk >= 1.67 at the initial study; Cpk >= 1.33 ongoing in production.

Certifications: ISO 9001:2015 (116024/A/0001/UK/En) · IATF 16949:2016 (131941/A/0001/SM/En, design clause 8.3 excluded) · ISO 14001:2015 (116024/B/0001/UK/En), held by Dongguan Zhuohang Ltd (USCC 91441900MA4UWT6X39, since 2005).

Service area: we supply Austria, Belgium, the Czech Republic, Denmark, France, Germany, Greece, Hungary, Ireland, Italy, the Netherlands, Spain, Sweden and the United Kingdom in Europe; Brazil, Canada, Mexico and the United States in the Americas; China, Israel, Japan, Singapore and Sri Lanka in Asia; Australia and New Zealand in Oceania; and South Africa in Africa, with worldwide delivery from China.

Contact: Felipe Iglesias, [email protected], +86 13126536955.

Inconel CNC Precision Machining — Related Pages

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• sand casting for prototypes aluminum types trade offs and how to choose
• 3 axis cnc precision machining