Penetration hardness tester
First Claim
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1. A hardness tester for performing materials hardness testing on a test specimen through the use of an indentor which creates a deformation in the specimen, said hardness tester operating on a load range including Rockwell tests comprising:
- an electric motor,an actuator vertically movable under control of said electric motor,said actuator coupled to a load cell which is directly coupled to said indentor,a linear displacement transducer sensing the amount of vertical movement of said actuator and said indentor,a closed loop control system to apply load to the test specimen and control indentor movement,a central processor unit included in said closed loop,a user interface electronically connected to said central processing unit to provide electrical signals to direct the test operation run by said hardness tester,said linear displacement transducer connected to said closed loop control system which, in combination, controls non-load vertical movement of the indentor resulting from an electrical feedback signal from the linear displacement transducer which is indicative of the amount of vertical movement of the indentor,said load cell connected to said closed loop control system which, in combination, controls indentor movement resulting from an electrical feedback signal from the load cell which is also indicative of the amount of load applied to said load cell and said indentor, the signal emitted from said load cell during the operation of the hardness tester directly controlling the indentor movement through said closed loop system, whereby the value of the load being applied is used both to determine said load and control movement of the indentor.
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Abstract
A hardness tester is disclosed which conducts its hardness test through a penetrator impinging upon the surface of a test specimen. Enhanced accuracy and repeatability is achieved through the use of a closed loop system and directly mounting a load cell to the indentor, connecting a linear displacement transducer directly to the load cell and eliminating an elevating screw in initially positioning and applying load to the specimen to be tested.
43 Citations
19 Claims
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1. A hardness tester for performing materials hardness testing on a test specimen through the use of an indentor which creates a deformation in the specimen, said hardness tester operating on a load range including Rockwell tests comprising:
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an electric motor, an actuator vertically movable under control of said electric motor, said actuator coupled to a load cell which is directly coupled to said indentor, a linear displacement transducer sensing the amount of vertical movement of said actuator and said indentor, a closed loop control system to apply load to the test specimen and control indentor movement, a central processor unit included in said closed loop, a user interface electronically connected to said central processing unit to provide electrical signals to direct the test operation run by said hardness tester, said linear displacement transducer connected to said closed loop control system which, in combination, controls non-load vertical movement of the indentor resulting from an electrical feedback signal from the linear displacement transducer which is indicative of the amount of vertical movement of the indentor, said load cell connected to said closed loop control system which, in combination, controls indentor movement resulting from an electrical feedback signal from the load cell which is also indicative of the amount of load applied to said load cell and said indentor, the signal emitted from said load cell during the operation of the hardness tester directly controlling the indentor movement through said closed loop system, whereby the value of the load being applied is used both to determine said load and control movement of the indentor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification
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Current AssigneeIllinois Tool Works Inc.
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Original AssigneeInstron Corporation (Illinois Tool Works Inc.)
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InventorsConti, Richard, Merck, John J. Jr., Wyman, Jon
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Primary Examiner(s)RAEVIS, ROBERT R
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Application NumberUS08/591,292Time in Patent Office432 DaysField of Search73/12.09, 73/12.12, 73/81-83, 73/78US Class Current73/82CPC Class CodesG01N 2203/0082 Indentation characteristics...G01N 3/42 by performing impressions u...
