For commutator bars, mainly hot rolled or hot extruded material is cold drawn with good dimensional precision. Commutator bars has the longest history in our Cu products and evaluated highly also for the quality.
Commutator Bar Shapes and production size range
In specifying the length, short length, enlarged length and standard length can be selected.
- Short length is to be selected for use with no cutting.
- Enlarged length is selected for length for few cuts, including the length for cutting margin.
- Standard length is selected when the entire length is specified.
Standard Dimensional Tolerance
Tolerance of A, B and C is listed below. Please consult us for if more precise tolerances are necessary.
|10 less than||±0.04||±0.04|
|ー||0.02 less than||±0.035||±0.035|
|remarks||measured at marginal limit||direct measurement|
|Up to 50||Up to 0.03|
|Above 50||Up to 0.04|
Warp, Twist and Camber(㎜)
|over100||under 0.15% of length|
|up to 100||Please consult|
Production Size Range and Properties
Material that can be applied id listed below conforming to JIS C2801 and besides TPC and 20Ag, 3Ag,8Ag is possible.
Please request us based on your application.
Mold commutators produced in recent years not only apply commutator bars but also formed bars, Cu tubes and strips and oxygen free Cu and AgOFC are also available.
|Material||Chemical Composition(%)||Electrical Conductivity%
|TPC||99.9%min||ー||ー||98min||Equivalent to JIS2801 class1, general purpose with no requirements on Heat softening resistance.|
|ー||99.9%min||0.15〜0.25||97min||Equivalent to JIS C2810 class2, mainly for rolling stock with requirements on heat softening resistance|
|ー||99.9%min||0.085〜0.102||97min||Mainly for rolling stock with requirements on heat softening resistance and general industrial use.|
Gauge for dimension Cross Section Gauge
Basically, the gauge for dimension measurement is to be provided.
It is possible for us to prepare the gauge bared by customer under actual expense.
The gauge to be provided should have dimensions or shape similar to the figure.