About Shaft Parts What You Need to Know

Analysis of the Structure, Material, and Process of Shaft Parts

1)Function and Structure of Shaft Parts

Shafts are used to support transmission parts and transmit torque or movement. The shaft needs to bear the load during work to ensure a certain degree of rotation accuracy. The machining surface of shaft parts usually has inner and outer cylindrical surfaces, inner and outer conical surfaces, step planes, and end planes, as well as threads, splines, keyways, and grooves.

2)Materials and Blanks of Shaft Parts

The materials of shaft parts generally include carbon structural steel and alloy structural steel.

The blanks of shaft parts include round bars, forgings, and steel castings.

shaft parts manufactured by YIJIN Hardware

3) Analysis of the Processing Technology of Shaft Parts

①The common axis is the radial design benchmark for each rotating surface. For shaft parts with high accuracy requirements, the axis of the center holes at both ends can be used as the radial machining datum; for gear shafts with low accuracy requirements and for rough machining, the outer circular surface can be used as the machining datum.

②Machining in the order of rough turning→semi-finishing turning→finishing turning, the splined shafts with high precision requirements should be arranged for grinding.

③The spline, keyway, and thread processing on the shaft parts are arranged after turning and before cutting; for the shaft parts that need to be quenched, the thread processing is placed after surface quenching.

④When the shaft blanks are forgings, normalizing treatment should be arranged, and important shaft parts should undergo multiple heat treatments.

Analysis of Gear Shaft Parts Processing Technology

shaft parts manufactured by YIJIN Hardware

1) Analysis of Shaft Parts.

2) Blank Selection.

3) Division of Processing Stages:

Divided into three stages: roughing, semi-finishing, and finishing.

Roughing stage: flush the end face, punch the center hole, and rough the outer circle.

Semi-finishing stage: semi-finishing turning, finishing each external circle, threading, keyway milling, gear milling.

Finishing stage: study the center hole, rough/finish two outer circles of 20, taper 1:10 truncated cone/30 gear top circle.

4) Benchmark Selection

Rough turning adopts the outer surface and the center hole as positioning benchmarks and adopts “one clamp and one top” turning, Two center holes are used as positioning reference when finishing turning and grinding.

5) Heat Treatment Process

the quenching and tempering process is placed after the rough turning process and before the semi-finishing process; the gear quenching is before the grinding process.

6) The Processing Process of Single-Piece and Small-Batch Production

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