{"id":1790,"date":"2026-04-08T01:05:55","date_gmt":"2026-04-08T01:05:55","guid":{"rendered":"https:\/\/wormwheelgear.top\/?post_type=product&p=1790"},"modified":"2026-04-08T05:57:38","modified_gmt":"2026-04-08T05:57:38","slug":"customized-worm-gear-set-oem-odm-ratio-201-3001-full-material-gear-type-coverage","status":"publish","type":"product","link":"https:\/\/wormwheelgear.top\/ar\/product\/customized-worm-gear-set-oem-odm-ratio-201-3001-full-material-gear-type-coverage\/","title":{"rendered":"\u0645\u062c\u0645\u0648\u0639\u0629 \u062a\u0631\u0648\u0633 \u062f\u0648\u062f\u0629 \u0645\u064f\u062e\u0635\u0635\u0629 | \u062a\u0635\u0646\u064a\u0639 \u0627\u0644\u0645\u0639\u062f\u0627\u062a \u0627\u0644\u0623\u0635\u0644\u064a\u0629\/\u062a\u0635\u0645\u064a\u0645 \u0627\u0644\u0645\u0639\u062f\u0627\u062a \u0627\u0644\u0623\u0635\u0644\u064a\u0629\u060c \u0646\u0633\u0628\u0629 \u0627\u0644\u062a\u0631\u0648\u0633 \u0645\u0646 20:1 \u0625\u0644\u0649 300:1\u060c \u062a\u063a\u0637\u064a\u0629 \u0643\u0627\u0645\u0644\u0629 \u0644\u0644\u0645\u0648\u0627\u062f \u0648\u0623\u0646\u0648\u0627\u0639 \u0627\u0644\u062a\u0631\u0648\u0633"},"content":{"rendered":"
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\u0646\u0638\u0631\u0629 \u0639\u0627\u0645\u0629 \u0639\u0644\u0649 \u0627\u0644\u0645\u0646\u062a\u062c<\/h2>\n

Every standard gear catalog was built for the most common applications. Module M4, ratio 20:1, C45 steel, 60-tooth wheel with \u00d825 mm bore \u2014 this specification covers a large fraction of general industrial drives. But product engineering rarely produces the most common application. An automotive electric power steering column needs 73:1 from a compact package in 42CrMo with a left-hand worm. A medical positioning table needs 48:1 in stainless steel with a DIN7-class tolerance and a keyway at 15\u00b0 to a specific face datum. A defense turret traverse needs 120:1 with carburized 20CrMnTi worm and a ductile iron wheel with machined mounting bolt circle. None of these exist in any catalog. Korea Ever-Power Worm Gear Co., Ltd manufactures custom \u0645\u062c\u0645\u0648\u0639\u0627\u062a \u0627\u0644\u062a\u0631\u0648\u0633 \u0627\u0644\u062f\u0648\u062f\u064a\u0629<\/strong><\/a> to any ratio, any material pairing, any bore configuration \u2014 from 3D CAD files, 2D drawings, or physical samples when drawings are not available. The NDA is signed before the first drawing is shared.<\/p>\n

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Why Worm Gears for High-Ratio Single-Stage Drives<\/h2>\n

The worm \u2014 a cylindrical gear resembling a threaded screw \u2014 paired with a worm wheel allows smaller gearboxes or planetary drives while retaining full torque or power transmission capacity. It is common for worm gear reductions to reach 20:1 and extend to 300:1 or more in a single stage that would require two or three stages of helical gearing to replicate. The geometry that makes this possible also produces the most distinctive operational feature: the worm can effortlessly drive the worm wheel, but the worm wheel cannot drive the worm back. When the gear attempts to rotate the worm, the shallow lead angle of the worm thread means that friction between the contact surfaces keeps the worm locked in position \u2014 self-locking is a natural consequence of the geometry, not an add-on feature.<\/p>\n

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OEM Worm Gear Set \u2014 Full Service Scope<\/h2>\n
\n\n\n\n\n\n\n\n
Gear Types<\/td>\nSpur gear, helical gear, internal spur gear, ring gear, straight\/spiral bevel gear, hypoid gear, crown wheel & pinion, gear shaft, worm gear & worm shaft, spline shaft & bushing, etc.<\/td>\n<\/tr>\n
Gear Material<\/td>\nCarbon steel, alloy steel, stainless steel, brass, bronze, cast iron, nylon, etc. { GB Steel grades: C45, 40Cr, 20CrMo, 20CrMoTi, 17CrNiMo6, 20CrMnTi, 42CrMo, etc. }<\/td>\n<\/tr>\n
\u064a\u0639\u0627\u0644\u062c<\/td>\nGear blank turning, gear hobbing, gear milling, gear shaping, gear shaving, tooth grinding, broaching, etc.<\/td>\n<\/tr>\n
Heat Treating<\/td>\nQuenching, carburizing, nitriding, carbon-nitriding, salt bath quenching, etc.<\/td>\n<\/tr>\n
\u0637\u0644\u0628<\/td>\nAutomotive, Agricultural, Electronic, Industrial, Medical, Defense, Off-highway, etc.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

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GB Steel Grade Guide \u2014 Selecting the Right Alloy for Your Application<\/h2>\n

The GB steel grade list in the OEM services table is not interchangeable \u2014 each grade has a specific combination of hardenability, core toughness, and heat treatment response that makes it appropriate for certain worm gear applications and inappropriate for others. Selecting the wrong grade produces premature tooth fatigue, inadequate surface hardness, or excessive brittleness after heat treatment. The guide below covers the six most commonly specified grades for worm gears in industrial and automotive applications.<\/p>\n

\"worm<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n
\u062f\u0631\u062c\u0629<\/th>\n\u0627\u0644\u0645\u0639\u0627\u0644\u062c\u0629 \u0627\u0644\u062d\u0631\u0627\u0631\u064a\u0629<\/th>\nSurface \/ Core Hardness<\/th>\n\u0627\u0644\u0623\u0641\u0636\u0644 \u0644\u0640<\/th>\n\u062a\u062c\u0646\u0628 \u0639\u0646\u062f<\/th>\n<\/tr>\n<\/thead>\n
C45<\/td>\nInduction hardening<\/td>\n55\u201360 HRC surface \/ 22\u201328 HRC core<\/td>\nGeneral industrial worm shafts, low-to-medium torque, indoor environment<\/td>\nHigh shock loading \u2014 low core toughness fractures under impact<\/td>\n<\/tr>\n
40 \u0643\u0631\u0648\u0631<\/td>\nThrough-hardening or induction<\/td>\n50\u201355 HRC surface \/ 32\u201338 HRC core<\/td>\nAgricultural gearboxes, moderate shock, where C45 core toughness is marginal<\/td>\nHighest precision grades \u2014 machinability slightly lower than C45<\/td>\n<\/tr>\n
20CrMo<\/td>\nCarburizing + quenching<\/td>\n58\u201362 HRC case \/ 30\u201338 HRC core<\/td>\nMedium-load automotive auxiliary drives, small-module precision worm shafts<\/td>\nVery large gear bodies \u2014 hardenability depth may be insufficient for thick sections<\/td>\n<\/tr>\n
20CrMnTi<\/td>\nCarburizing + quenching<\/td>\n58\u201362 HRC case \/ 33\u201340 HRC core<\/td>\nHigh-load automotive transmission worms, heavy-duty off-highway drives, defense<\/td>\nLight-load applications where cost is primary \u2014 overkill for general industrial duty<\/td>\n<\/tr>\n
17CrNiMo6<\/td>\nCarburizing + quenching<\/td>\n60\u201363 HRC case \/ 38\u201344 HRC core<\/td>\nAircraft gearboxes, wind turbine pitch drives, maximum fatigue strength requirement<\/td>\nStandard industrial duty \u2014 material and heat treatment cost is 3\u20134\u00d7 C45; not economically justified below maximum fatigue requirements<\/td>\n<\/tr>\n
42CrMo<\/td>\nThrough-hardening + tempering<\/td>\n48\u201354 HRC uniform through-section<\/td>\nEPS column gears, press screws, heavy structural drives where uniform hardness through the section is preferred over a case-and-core structure<\/td>\nApplications requiring the highest surface hardness only \u2014 42CrMo’s uniform hardness means the core is harder (and less tough) than carburized grades with a soft core<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

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Heat Treatment Selection \u2014 Quenching vs Carburizing vs Nitriding for Worm Gears<\/h2>\n

Heat treatment method is often specified without understanding what each process actually achieves at the tooth surface. The four methods in the OEM services table produce different hardness distributions, case depths, and residual stress states \u2014 with direct consequences for wear resistance, impact tolerance, and gear accuracy after treatment.<\/p>\n

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Quenching & Tempering<\/p>\n

Through-hardening process: the gear is heated above the austenite transition, quenched in oil or water, then tempered at 150\u2013600\u00b0C to the target hardness. Produces uniform hardness from surface to core. The trade-off is brittleness at high hardness \u2014 above approximately 55 HRC, the toughness of through-hardened steel drops sharply. For worm gear applications requiring both wear resistance and shock load tolerance, through-hardening is typically not the first choice. Best applied to worm shaft materials (42CrMo, 40Cr) where core toughness is slightly less critical than for the wheel, and for gear bodies with large sections where case hardening depth is insufficient.<\/p>\n<\/div>\n

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Carburizing & Quenching<\/p>\n

Case hardening process: carbon is diffused into the surface at 880\u2013930\u00b0C over 4\u201320 hours to a depth of 0.3\u20132.0 mm, then the gear is quenched to form martensite in the case only. The result is a hard case (58\u201363 HRC) over a tough core (30\u201340 HRC). This combination gives the best combination of wear resistance and impact resistance \u2014 the hardened surface resists abrasive and adhesive wear, and the tough core absorbs shock loading at the tooth root. For worm gear applications in automotive, off-highway, and agricultural equipment where shock loads are regular, carburizing is the standard specification. The grain structure improvement from the carburizing cycle also slightly improves the material’s fatigue strength, extending service life beyond what a simple hardness comparison would predict.<\/p>\n<\/div>\n

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Nitriding<\/p>\n

Surface diffusion of nitrogen at 480\u2013520\u00b0C \u2014 below the tempering temperature for most alloy steels. This means the gear can be fully machined to final dimensions, then nitrided, with only 0.01\u20130.02 mm of dimensional change \u2014 an advantage for precision gear teeth where post-nitriding grinding would otherwise be required to restore tooth geometry. Nitrided surfaces reach 60\u201370 HN (approximately equivalent to 65\u201370 HRC on the nitrided layer scale). The case depth is shallow (0.15\u20130.5 mm), which limits the maximum contact pressure the surface can withstand \u2014 nitriding is appropriate for precision gear drives at moderate contact pressures, not for heavily loaded drives where the case depth is insufficient to support the subsurface stress field.<\/p>\n<\/div>\n

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Carbon-Nitriding (Carbonitriding)<\/p>\n

A variant of carburizing where both carbon and nitrogen are diffused simultaneously at 800\u2013880\u00b0C. The nitrogen addition improves the hardenability of the case, allows lower quench temperatures (reducing distortion), and produces a more compressive residual stress in the case that improves fatigue resistance. Carbonitriding is typically applied to smaller gear parts (module M1\u2013M3) and parts requiring good surface hardness with minimum distortion after heat treatment \u2014 common in automotive transmission and small industrial gearbox applications where post-treatment grinding is expensive or impractical. The case depth is generally 0.1\u20130.5 mm, shallower than conventional carburizing.<\/p>\n<\/div>\n<\/div>\n

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Processing Methods \u2014 What Each Operation Contributes to Gear Accuracy<\/h2>\n

The processing list in the OEM services table is not a menu of equivalent alternatives \u2014 each operation plays a specific role in the production sequence, and the combination determines the achievable precision class. Understanding this helps buyers specify a realistic process for their target tolerance without over-specifying expensive operations for tolerances that simpler processes can achieve.<\/p>\n

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