YHYuehongPowder Metallurgy
Process capability

Sizing

Sizing is a secondary pressing of a sintered part inside a sizing die to improve dimensional accuracy and surface finish. It is used when pressed-and-sintered tolerances are not tight enough for the application.

How the process works

  • The sintered part is pressed in a sizing die at room temperature.
  • The tooling burnishes surfaces and corrects dimensions.
  • Sizing improves precision beyond the sintered state.

When it is used

  • Tight bore or outside-diameter tolerances
  • Improved straightness and parallelism
  • Better surface finish on functional faces

Suitable geometry

  • Bushings
  • Gears with critical faces
  • Flanged components

Secondary operations

  • Secondary machining
  • Cleaning

Typical applications

  • Bearing bores
  • Gear critical dimensions
  • Structural mating surfaces

Advantages

  • Improves dimensional consistency
  • Enhances surface finish
  • Sometimes improves fatigue performance by surface compression

Limitations

  • Adds a tooling and processing step
  • Adds cost per part, justified by accuracy requirements
Quality & engineering

Quality and Engineering Information

In-process controls applied to this capability. Specific acceptance criteria are defined from the customer specification.

Dimensional inspection
Surface finish measurement
Related products

Parts Made With This Capability

Automotive & Transportation · Power Tools

Sintered Gears

Sintered gears are powder metallurgy components pressed and sintered to near-net shape. The process suits high-volume production of repeatable gear geometries in iron-, copper- and stainless-steel-based powders, for automotive, power tool, office equipment and smart home drive trains.

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Automotive & Transportation · Smart Home

Sintered Bushings

Sintered bushings and oil-impregnated bearings are pressed from metal powder and sintered with a controlled porous structure that can hold lubricating oil. They provide a self-lubricating, cost-efficient bearing solution for high-volume rotating and sliding applications.

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Related capabilities

Other Processes in the PM Line

General powder metallurgy reference. Achievable tolerance ranges require engineering confirmation.

Plan your part

Discuss Your Manufacturing Requirement

Describe the geometry, material and volume you have in mind. Our engineering team will recommend the right process route and review feasibility.