Jinhua Machinery manufactures hot-forged and machined components from customer-approved drawings. The confirmed route is forging, quench and temper, datum machining, finish machining of bores and outside diameters, specified tooth or spline processing, grinding, QR-code traceability, cleaning, and packaging. Material grade, forged-blank allowance, datum structure, heat-treatment movement, critical surfaces, annual quantity, and inspection records are reviewed before quotation. Gear shaping, hobbing, knurling, or spline rolling is selected only where required by the released drawing; the list is not a promise that every operation applies to every part.
A hot-forged machined component begins as a heated billet formed to establish the basic load-bearing shape and material flow. Quench and temper is then completed before the confirmed route proceeds through datum preparation, bore and outside-diameter finishing, applicable tooth or spline operations, grinding, traceability marking, cleaning, and packaging.
Hot forging is evaluated for parts whose geometry, section size, strength requirement, material flow, or blank economics favor heated forming. Selection still depends on the released drawing, steel grade, heat treatment, machining stock, distortion risk, quantity, and required inspection.
Hot forging is commonly evaluated when a part needs larger deformation, thicker sections, a more complex load-bearing blank, or a steel grade and geometry that are less suitable for cold forming. The objective is not simply to replace machining: the forged blank must leave controlled stock on bores, journals, faces, shoulders, splines, and gear features so heat-treatment movement and forging variation can be removed during finishing.
The sequence below reflects the confirmed manufacturing route. Individual tooth operations, heat treatment, and inspection points are selected from the released drawing and control plan.
Commonly evaluated hot-forging steels include Chinese 20, 25, 35, 45, 40Cr, and 42CrMo, together with SAE 1020, 1025, 1035, 1045, 4140, and 5140. Selection depends on the governing standard, section size, hardenability, mechanical properties, heat treatment, cleanliness, delivery condition, and certification.
Hot-forged stock is planned around bores, journals, faces, splines, and gear features so scale, forged-blank variation, and quench-and-temper movement can be removed during datum and finish machining. Datum selection is reviewed before tooling release. Section changes, wall thickness, clamping access, straightening needs, local induction-hardening areas, and grinding stock are considered before a finished tolerance is committed.
The process plan identifies responsibility for forging, quench and temper, machining, tooth or spline operations, grinding, and any drawing-specific special process. Inspection planning can include material and supplier records, bulk hardness, dimensional checks after heat treatment and finish machining, runout, surface finish, tooth or spline requirements, QR-code traceability, cleaning, and packaging records.
Hot forging programs are planned around billet design, formed geometry, machining stock, quench-and-temper movement, hardness requirements, surface quality, and production consistency.
We review whether heated blank forming fits the part geometry, material grade, strength target, annual demand, and machining allowance.
Turning, milling, drilling, boring, grinding, thread, groove, shoulder, and bearing-seat features can be planned after forged blank preparation.
The confirmed general hot-forging route includes quench and temper before datum and finish machining. Any later local induction hardening or other drawing-specific treatment is reviewed separately.
Critical dimensions, hardness, runout, surface finish, fit requirements, and packing expectations are considered before repeatable production.
These cases document component-specific materials, routes, and drawing controls. They are manufacturing evidence, not universal specifications for a new inquiry.
A forged blank followed by datum machining, bore and outside-diameter finishing, rough hobbing, local induction hardening, finish hobbing, grinding, traceability marking, cleaning, and packaging.
View manufacturing caseA separate hot-forged gear-shaft case using a drawing-specific alloy-steel, machining, gear-processing, carburizing, hardness, case-depth, and gear-quality route.
View manufacturing caseThese values can be achieved within the stated feature sizes and process ranges, subject to drawing review. Final applicability depends on material, heat treatment, geometry, datum access, stock allowance, quantity, and the inspection plan.
Up to 50 mm diameter and 300 mm effective grinding length: 0.005 mm total diameter tolerance, 0.003 mm roundness, 0.005 mm cylindricity, 0.005 mm straightness per 300 mm, and Ra 0.2 µm.
Up to 30 mm bore diameter and L/D up to 3 using precision boring or reaming: 0.009 mm total bore tolerance, 0.005 mm roundness, 0.008 mm cylindricity, and Ra 1.0 µm.
Related journal or tooth-datum total runout, bore-to-OD coaxiality or total runout, and face perpendicularity or face runout can achieve 0.010 mm when defined by the reviewed drawing.
The standards listed on related pages describe confirmed reference conditions, not an exclusive standards list. Other ISO, GB/T, DIN, AGMA, ANSI, SAE, customer-specific, or industry-specific standards can be evaluated. Equivalent grade numbers are not assumed to be interchangeable.
A hot-forged blank can be evaluated when the geometry, section size, material, load path, or quantity makes near-shape forming more appropriate than removing the complete profile from solid stock. The economic and technical benefit depends on tooling, forging allowance, annual demand, heat treatment, and finish-machining requirements.
In the confirmed general hot-forging route, quench and temper is completed after forging and before datum and finish machining. A drawing-specific local induction-hardening, carburizing, or other special treatment is reviewed separately and is not assumed for every part.
The process review assigns stock to critical bores, journals, faces, shoulders, splines, and gear features, then considers forged-blank variation, scale, heat-treatment movement, clamping access, straightening needs, and grinding stock before finished tolerances are committed.
Yes, when required by the released drawing. Gear shaping, hobbing, knurling, spline rolling, and related finishing operations are selected by geometry, material condition, heat treatment, accuracy requirement, datum system, and inspection method.
Send the released drawing and available 3D model, revision, material and standard, prototype and annual quantity, bulk and local heat treatment, critical datums and tolerances, tooth or spline requirements, inspection records, marking, packaging, and delivery target.
Include material, quantity, tolerance, heat treatment, finishing, and application requirements when available.
