Impact ExtrusionsTechnical Information

The Impact Extrusion Process.

A part which is formed in a confined die from a cold metal slug which has been lubricated. Using a single stroke of applied force, the metal extrudes around the punch and through an opening in the punch or die. There are three types of impact extrusions; Forward Impacting, Reverse Impacting and Combination Impacting.

Forward Impacting

Reverse Impacting

Combination Impacting

Commercial Dimensional Tolerances of Mueller Impact Extrusions

Commercial Tolerances (Inches ±) Minimum Wall Thickness (Inches)
Outside Diameter (Inches) O.D. I.D. Bottom 1100 Alloy 6061 Alloy 2014 Alloy 7075 Alloy
1 ±.005 ±.006 ±.010 0.010 0.015 0.035 0.040
2 ±.007 ±.008 ±.012 0.020 0.020 0.070 0.080
3 ±.009 ±.010 ±.015 0.030 0.020 0.105 0.120
4 ±.011 ±.012 ±.015 0.040 0.030 0.140 0.160
5 ±.014 ±.014 ±.015 0.050 0.060 0.175 0.200
6 ±.020 ±.020 ±.015 0.060 0.140 0.210 0.240
7 ±.025 ±.026 ±.018 0.150 0.300 0.430 0.450
8 ±.032 ±.033 ±.021 0.300 0.600 1.200 1.300

Wall tolerance (concentricity) generally is = 10% of the wall thickness for thin walls up to 0.25 and 7% for heavier walls between 0.25 and 1.00 inches. The above is offered as a guide only, each design should be reviewed by a Mueller Impacts Co. engineer for acceptable tolerances.

Materials currently formed by Mueller Impact Extrusions

Alloy Description Comment
Aluminum*
1100 Aluminum Excellent conductivity and heat transference. Good corrosion resistance.
2014 Aluminum and Copper Excellent mechanical properties. Heat treatable.
3003 Aluminum and Manganese Moderate strength. Non heat treatable. Brazeable applications.
4032 Aluminum and Silicon High wearing properties.
5086 Aluminum and Magnesium Non heat treatable. Good strength and corrosion resistance.
6020 Aluminum and Tin Suitable replacement for leaded aluminum alloys.
62 SN Aluminum and Tin Suitable replacement for leaded aluminum alloys.
6061 Aluminum with Silicon & Magnesium Heat treatable & medium strength. Very versatile, many applications.
6063 Aluminum with Silicon & Magnesium Heat treatable & medium strength. Good corrosion resistance.
6082 Aluminum with Silicon & Magnesium Heat treatable & medium strength. Very versatile, many applications.
7075 Aluminum and Zinc Heat treatable. For high strength applications.

* Other materials available. Please contact Mueller with any requests.