CNC machining Invar

High precision, low expansion, stability, durability, complex geometries.

Invar applications

  1. Precision instruments
  2. Clocks and watch balance wheels
  3. Seismic creep gauges
  4. Color-television tubes’ shadow-mask frames
  5. Engine valves
  6. Large aerostructure molds
  7. Pendulum rods for precision clocks
  8. First-order elevation leveling rods in land surveying
  9. Pistons for thermal expansion control
  10. Aerospace carbon fiber layup molds
  11. Structural components in astronomical telescopes
Invar CNC parts manufacturing

Invar alloy CNC milling

Key Properties of Invar

Property Description
Composition Approximately 36% nickel and 64% iron
Solid Solution Invar is a single-phase alloy
Nickel Content Range “30-45 atom percent nickel”
Coefficient of Thermal Expansion (α) Common grades of Invar have a thermal expansion coefficient of about 1.2 × 10^−6 K−1 (1.2 ppm/°C); extra-pure grades (<0.1% Co) can achieve values as low as 0.62–0.65 ppm/°C
Thermal Expansion Coefficient Comparison Ordinary steels have thermal expansion coefficients of around 11–15 ppm/°C
Negative Thermal Expansion (NTE) Characteristics Some formulations display negative thermal expansion characteristics
High Dimensional Stability Displays high dimensional stability over a range of temperatures
Propensity to Creep Has a tendency to creep

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Why Choose Modo Rapid

We Are Experienced in Machining Invar Parts

At Modo Rapid, we pride ourselves on our extensive experience in machining Invar, an alloy renowned for its unique properties, particularly its minimal thermal expansion. Invar, composed mainly of nickel and iron, is critical in applications requiring dimensional stability across a wide range of temperatures.

Invar is relatively easy to machine compared to other nickel-based alloys, thanks to its low work hardening rate. However, it still presents certain challenges that require a nuanced understanding and specialized techniques to ensure the highest quality results.

Our machining process for Invar involves using sharp tools and maintaining a consistent cutting speed to prevent any potential deformation or surface hardening. We typically employ carbide or high-speed steel tools, which are excellent for maintaining precision and achieving smooth finishes on Invar parts.

One of the critical factors in machining Invar is managing its thermal properties. Due to its low thermal conductivity, we use a combination of flood cooling and proper chip evacuation techniques to maintain optimal temperature control during the machining process. This approach minimizes the risk of thermal expansion and ensures that the dimensional integrity of the part is preserved.

For operations requiring threading, we utilize precision lathes and thread-milling machines, ensuring clean and accurate threads that meet stringent industry standards. Whether it’s internal or external threading, our attention to detail and adherence to best practices guarantee the production of reliable, high-performance components.

Our team’s expertise in working with Invar allows us to deliver components that exhibit exceptional stability and precision, making them ideal for applications in aerospace, scientific instruments, and other fields where minimal thermal expansion is critical. Trust Modo Rapid to provide you with expertly machined Invar parts that meet your exacting specifications and exceed your expectations.

Invar CNC turning