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Close Tolerance Magnesium Castings See full article below the photograph.
Click on above image for a larger view.
The castings above were produced for a major power tool company.
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Castings were all produced "net shape", that is, they did not require any machining.
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Typical "as cast" tolerances were:
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True position of bearing pockets, 0.0015 inch (0.0375 mm)
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Cored hole diameters, +/- 0.0005 inch (0.0127 mm)
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Perpendicularity, +/- 0.0005 inch (0.0127 mm)
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By casting net shape and eliminating the machining operations, it was possible to significantly reduce cost. For example one of the simpler castings was converted from a competing process and cost was reduced by $1.00. Its mating part was previously heavily machined. It was reduced by $2.00 resulting in a $300,000 annual savings for the pair.
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Responsibility and involvement:
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Full time employee, Senior Project Engineer
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Identified cost reduction opportunities by converting existing components to magnesium
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Managed tooling design and construction
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Managed tool maintenance
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Managed facility renovation to improve the work environment and increase employee morale
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Evaluated and selected suppliers for die cast dies, trim dies, fixtures, machine repair components, furnaces and other processing equipment.
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Instituted material flow and processes to reduce manual labor and associated errors. This contributed to reducing headcount by 40%.
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Created work and inspection instructions that allowed operators to assume responsibility for quality. Eliminated floor inspectors from all shifts. Quality improved from 65 to 99% good parts in 6 months.
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Created die casting machine rebuild specifications and managed rebuilds.
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Created new furnace control system and seal system that significantly reduced melt and dross loss.
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Developed proprietary hot chamber magnesium gooseneck and other shot end components.
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Managed new tooling sampling and approval process.
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Identified opportunities to reduce error by standardizing and clarifying specifications on part drawings. This had a worldwide benefit.
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Trained existing skilled trades in hydraulics, electrical and electronics. This improved machine up time from 75 to 95%.
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Cut employee absenteeism by 55%.
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Actual productivity increased by 2.4 times in 24 months. The type of improvements listed above may be possible in your operation. Contact us for an on-site evaluation.
Additional Casting examples, stories and case histories
Contact Bob McClintic @: RMcClintic@DrDieCast.com (Click here) Updated: August 2017 Copyright Bob McClintic and Associates, 1991- 2017 |
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