In high-performance cycling,reducing component weight while maintaining the required structural stiffness is an important design consideration.Advanced composite materials provide opportunities to achieve lightweight and efficient structures.Within these constructions,PMI foam is widely used as a structural core in high-performance sandwich applications.

However,specialized components often require more than standard rectangular foam sheets.Circular profiles,central openings,and customized contours demand precise CNC machining.

In a recent customer project,Xintan machined a customized white PMI foam component featuring a circular profile and central opening for a bicycle disc wheel application.This project demonstrates how customized PMI foam machining can support specialized lightweight composite designs.

1.Why PMI Foam for Advanced Cycling Components?

High-performance bicycle components have demanding requirements for weight,stiffness,and geometry.PMI foam offers several characteristics suitable for lightweight sandwich structures:

Low density to help reduce component weight.

High specific mechanical properties for lightweight structural designs.

Dimensional stability when the appropriate grade and processing conditions are selected.

Process compatibility with various composite manufacturing methods.

When integrated into a properly designed sandwich structure,PMI foam serves as a lightweight core between composite face sheets.Final structural performance depends on the foam grade,face-sheet materials,bonding system,and overall design.

2.CNC Machining for Customized Disc Wheel Geometries

Unlike standard flat panels,specialized components often require customized machining.

For this bicycle disc wheel project,the PMI foam was machined into a circular component featuring:

A customized outer profile.

A precisely machined central opening.

Specified thickness and dimensional requirements.

Geometry tailored to the customer's design.

CNC machining enables customized foam components to be manufactured according to engineering drawings,supporting the production of specialized composite parts.

3.Why Machining Accuracy Matters

For circular components,dimensional accuracy is particularly important.The outer profile,central opening,thickness,and alignment must meet the design requirements to ensure proper fit during subsequent manufacturing and assembly.

Key machining considerations include:

Outer and inner diameter tolerances.

Concentricity between the central opening and outer profile.

Thickness consistency.

Surface quality.

Dimensional inspection against approved drawings.

4.Beyond Conventional Flat Panels

PMI foam is not limited to conventional flat sandwich panels.With customized CNC machining,it can be processed into various geometries,including:

Circular and annular components.

Curved and contoured core sections.

Components with holes,pockets,and recesses.

Complex shapes for specialized composite assemblies.

These capabilities give designers greater flexibility when developing customized lightweight structures.

5.Xintan's Customized PMI Foam Machining Capabilities

At Xintan,XTylene®PMI foam cores are available in multiple density grades and can be CNC-machined into customized dimensions,thicknesses,and complex geometries based on customer drawings.

From conventional sandwich cores to specialized components such as circular foam parts,Xintan provides material and machining solutions for diverse composite manufacturing requirements.

Looking for customized PMI foam cores for your next project?

Contact Xintan to discuss your material selection,drawings,and CNC machining requirements.