Inspection and Repairs of Extrusion Press Components by Al Kennedy www.alkennedy.net Company Logo
Ideas presented here apply to extrusion presses and also other equipment Logo de Empresa
Fatigue (n) fa-tēg′: Weakening or failure of materials under the action of repeated stresses Logo de Empresa
Types of non-destructive inspection visual ultrasonic magnetic particle liquid penetrant infrared thermography eddy current radiography (x-ray)
Types of non destructive inspection visual ultrasonic magnetic particle liquid penetrant infrared thermography eddy current radiography (x-ray)
These high-tech tests require special knowledge and equipment My expert: Ron Manganello, Carlesa NDE: RonManganello@PressTest.com Following examples are from Mr. Manganello
Visual Inspections The primary method used for extrusion presses Look for: loose or missing components oil leaks cracks
Visual Inspections
Visual Inspections
Ultrasonic Inspections The most sensitive technology for detecting subsurface flaws It can detect extremely small flaws such as cracks at great depths. It can evaluate the thickness of an object to determine if there is corrosion. Ultrasonic needs only one accessible surface
Ultrasonic Inspections Indication of crack in tie-rod
Magnetic Particle Inspections First magnetizes the surface Colored magnetic particles are spread over the surface. If there is a crack or other flaw, magnetic particles become attracted to and build up along the area of the defect
Magnetic Particle Inspections
Liquid Penetrant Inspections Often used on materials where magnetic particle examination is difficult to use. The surface is first cleaned, a red dye is placed on the area of interest, then a white developer is sprayed onto the surface. The developer draws the dye into the surface defects. If a colored dye appears, that indicates the position of the flaw
Liquid Penetrant Inspections
Liquid Penetrant Inspections
Examples of Common Problems with Different Components
Main Cylinders
Main Cylinders Casting flaws –bubbles & impurities
Main Cylinders
Main Cylinders
Main Cylinders
Main Cylinders
Main Cylinders
Main Cylinders
Main Cylinders
Main Cylinders
Main Cylinders
Main Cylinders
Main Cylinders
Main Cylinders
Front Platens
Front Platens
Front Platens
Tie Rods
Tie Rods
Tie Rods
Ram Stems
Ram Stems
Ram Stems
Container Shift Cylinders
Container Shift Cylinders
SUMMARY Non-destructive tests provide a good picture of the press’s condition Repairs may be anticipated well in advance, to purchase long-delivery parts, and to avoid unplanned downtime Results are cost savings and possible prevention of injury or death to workers Tests require competent technicians and specialized equipment – may be in-house or consultants Tests should include detailed records and documentation of results
RonManganello@presstest.com
¡Gracias! alkennedy@usa.net www.alkennedy.net www.pressmaintmanual.com