Jinhua Machinery manufactures cold-forged and machined components from customer-approved drawings. The confirmed route starts with cut stock, rough machining of the cold-extrusion datum, phosphate and soap coating, and cold extrusion of internal or external splines, cold upsetting, or cold diameter reduction. Subsequent operations establish clamping datums from the spline, finish bores and outside diameters, add milled and specified tooth features, grind functional surfaces, apply QR-code traceability, and complete cleaning and packaging. Material, deformation, allowance, datum relationships, heat treatment, quantity, and inspection requirements are reviewed before quotation.
A cold-forged machined component uses controlled forming near room temperature to create splines, upset sections, reduced diameters, or other near-net features before finish machining. The route can reduce material removal, but its suitability depends on steel formability, feature depth, deformation ratio, lubrication, tooling access, functional datums, heat treatment, and production demand.
Cold forging can be evaluated for sleeves, splined parts, bushings, shafts, fastener-related parts, and other repeated components where controlled material flow and reduced machining waste support the drawing. The approved route is determined from the part rather than from the category name alone.
Cold forging is commonly evaluated for repeat components where an internal or external spline, upset section, reduced diameter, sleeve, or stepped feature can be formed near net shape before machining. It can reduce stock removal and material consumption, but the decision depends on steel formability, delivery condition, deformation level, feature depth, section transitions, tooling access, annual demand, and the finishing stock required by the drawing.
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 cold-forging materials include 16MnCr5, ZF6, Chinese 20, 25, 35, 45, and 40Cr, together with SAE 1010, 1015, 1020, 1025, 1035, 1045, and 4140. Formability, spheroidization or delivery condition, surface quality, hardenability, deformation level, and certification must match the drawing and purchasing specification.
Cold-formed stock is planned so the spline or other formed feature can establish a stable relationship with later clamping datums, bores, journals, faces, and milled features. The review considers deformation sequence, elastic recovery, section transitions, tool access, post-forming heat treatment, clamping force, and grinding stock before finished tolerances are committed.
The process plan identifies responsibility for material preparation, phosphate and soap coating, cold extrusion or upsetting, machining, tooth or spline operations, grinding, and any drawing-specific heat treatment or surface protection. Inspection planning can include incoming material condition, formed-feature checks, spline datum relationships, finished bore and outside-diameter dimensions, runout, roughness, QR-code traceability, cleaning, and packaging records.
Cold forging programs are reviewed around stock preparation, extrusion datums, lubrication, forming feasibility, machining allowance, tolerance targets, and stable production control.
We review geometry, material grade, feature depth, quantity, strength target, and whether cold forming can reduce machining waste for the program.
CNC turning, milling, drilling, grinding, threading, keyway, spline, shoulder, and bore features can be added after cold forged blank preparation.
Phosphate and soap coating is included before the confirmed cold-extrusion step. Any later heat treatment or surface protection is controlled by the released drawing and application.
We identify critical fits, datum relationships, runout, thread quality, tooth or spline features, and inspection methods before quotation.
These cases document component-specific materials, routes, and drawing controls. They are manufacturing evidence, not universal specifications for a new inquiry.
A cold-forged shaft case combining spline rolling, turning, milling, grinding, laser marking, bulk heat treatment, and selective induction hardening under component-specific controls.
View manufacturing caseA cold-forged external-spline case followed by turning, milling, deep-hole drilling, quench and temper, and drawing-specified zinc-nickel surface protection.
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.
Internal or external splined parts, sleeves, bushings, stepped shafts, upset sections, reduced diameters, and related repeat components can be evaluated. Suitability depends on material condition, deformation level, feature depth, radii, tooling access, annual demand, and post-forming finishing requirements.
They can be evaluated as part of the confirmed route. The review considers spline geometry, material formability, extrusion datum, lubrication, deformation sequence, tool access, later clamping datums, heat treatment, and the final gauge or analytical inspection requirement.
The drawing and purchasing specification govern the grade and standard. Formability, spheroidization or delivery condition, surface quality, cleanliness, hardenability, deformation amount, later heat treatment, mechanical properties, and certification are reviewed before a material is accepted.
Yes. The confirmed route can establish clamping datums from the formed spline, finish bores and outside diameters, add milled and specified tooth features, grind functional surfaces, apply QR-code traceability, and complete cleaning and packaging.
Send the released drawing and available 3D model, revision, material and delivery condition, prototype and annual quantity, formed-feature requirements, heat treatment, critical datums and tolerances, spline or tooth standard, inspection method, marking, packaging, and delivery target.
Include material, quantity, tolerance, heat treatment, finishing, and application requirements when available.
