Custom Pinion Gear Manufacturing
Jinhua Machinery manufactures pinions to customer drawings for gear, steering and transmission assemblies. The component shown combines external spline features with machined diameters and heat-treated surfaces. Because spline geometry, datums, hardness and mating interfaces affect one another, quotation and process planning are based on the complete released drawing.
Verified component specification
- Material: Low-carbon steel.
- Spline forming: Spline rolling and cold forging for two external splines.
- Machining: Turning, milling and grinding.
- Heat treatment: Carburizing and quenching with low tempering.
- Hardness: HRC 58–63.
- Dimensional control: Outer-diameter tolerance within 12 μm and inner-diameter tolerance within 22 μm.
Manufacturing process
The production route begins with review of the material, spline definitions, datum system and controlled dimensions. Spline rolling and cold forging form the two external spline features. Turning and milling establish the specified shaft geometry, while grinding is used for the features identified in the process plan. Carburizing, quenching and low tempering produce the stated hardness range. Final sequencing and machining allowance are set from the drawing so the heat-treated part can meet its dimensional and spline requirements.
Heat treatment and inspection
The drawing and purchase specification should identify the required hardened zone, case requirements if applicable, test locations and acceptance method. Inspection can include spline geometry, outside and inside diameters, datum-related dimensions, machined surfaces and HRC 58–63 hardness. Material certificates, heat-treatment records, dimensional reports, spline inspection results and traceability records can be included when required by the agreed purchasing specification.
Application review
Pinions of this type are reviewed for gear, steering and transmission assemblies where torque transfer, spline engagement and controlled fits are important. Load, mating geometry, lubrication, service conditions and final design validation remain defined by the customer. Jinhua Machinery’s role is to manufacture and inspect the part to the approved specification.
Information required for quotation
- 2D drawing and available 3D model
- Material grade and governing standard
- Spline or gear geometry and quality requirements
- Heat-treatment, hardness and surface requirements
- Critical dimensions, datums and tolerances
- Prototype quantity, production quantity and annual demand
- Inspection documents, certificates and delivery target
See our custom gear manufacturing capabilities and quality inspection process. To start a review, send the available project requirements to Jinhua Machinery.