US3803908A - Material discriminating device for metallic plates - Google Patents

Material discriminating device for metallic plates Download PDF

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Publication number
US3803908A
US3803908A US00228994A US22899472A US3803908A US 3803908 A US3803908 A US 3803908A US 00228994 A US00228994 A US 00228994A US 22899472 A US22899472 A US 22899472A US 3803908 A US3803908 A US 3803908A
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United States
Prior art keywords
passage
metallic plates
metallic
plate
deformation
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Expired - Lifetime
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US00228994A
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English (en)
Inventor
T Endo
R Yamashita
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Mitsubishi Heavy Industries Ltd
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Mitsubishi Heavy Industries Ltd
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Priority claimed from JP1774771A external-priority patent/JPS5115754B1/ja
Priority claimed from JP2143971U external-priority patent/JPS5247513Y2/ja
Priority claimed from JP1775171A external-priority patent/JPS5249354B1/ja
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
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Publication of US3803908A publication Critical patent/US3803908A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0016—Tensile or compressive
    • G01N2203/0019—Compressive

Definitions

  • MATERHAL DiSCRlMliNATlNG DEVICE FOR METALLIC PLATES Inventor's: Talkashi Endo, Kobe; Riichiro Yamashita, Kakogawa, both of Japan Mitsubishi Jukogyo Kabushiki Kaisha, Tokyo, Japan Filed: Feb. 24, 1972 Appl. No.: 228,994
  • a material discriminating device for metallic plates comprises a base member having a passage with dimensions fitting the configuration of metallic plates whose material is to be discriminated, pressing means disposed along the passage for applying a predetermined load to the metallic plates, and deformation detecting means disposed along the passage for detecting the magnitude of the permanent deformation of the metallic plates caused by the pressing means, whereby the material of metallic plates may be discriminated on the basis of the magnitude of the permanent deformation which depends upon the elastic limits of the metallic plates. Novel constructions of the pressing means as well as the deformation detecting means. are also provided.
  • the present invention relates in general to a material discriminating device for metallic plates, and more particularly to a such a device which discriminates material of metallic plates on the basis of the magnitude of permanent deformation of metallic plates caused by a predetermined load applied thereto.
  • an automatic non-destructive testing device for checking whether or not a metallic plate stamped into a desired configuration such as, for example, a circular plate, is made of desired material
  • a metallic plate stamped into a desired configuration such as, for example, a circular plate
  • one object of the present invention is to provide a novel device which can discriminate the material of metallic plates exactly and with high precision.
  • Another object of the present invention is to provide a novel device which is adapted to give a deformation to a metallic plate and to discriminate the material of the metallic plate with high precision on the basis of whether or not the deformation comes within an elastic limit of the material forming the metallic plate.
  • Yet another object of the present'invention is to provide a novel device which can reliably discriminate the material of metallic plate without being affectedby the alloy composition and/or the co-existence of impurity in the metallic plate.
  • a further object of the present invention is to provide a novel device which can automatically and nondestructively discriminate the material of metallic plates.
  • a still further object of the present invention is to provide a material discriminating device, which is adapted to apply a load to a metallic plate and to auto matically discriminate the material of the metallic plate by detecting the pennanent deformation caused by the load, and in which the means for achieving the operation steps are specifically constructed and assembled together.
  • FIG. 1 is a diagram showing the relation between the load applied to a metallic plate and the magnitude of deformation for explaining the principle of the material discrimination utilized by the device according to the present invention
  • FIG. 2 is a schematic structural view illustrating one preferred embodiment of the device according to the present invention.
  • FIG. 3 is a longitudinal cross-section view of the automatic pressing device for the metallic plate as illustrated in FIG. 2,
  • FIG. 4 is a diagram showing the variation with time of the attractive force exerted by a solenoid in the automatic pressing device
  • FIG. 5 is a plan view of the deformation measuring device for the metallic plate as illustrated in FIG. 2,
  • FIG. 6 is a side elevation view of the device illustrated in FIG. 5, and
  • FIG. 7 shows an electric circuit associated with the device illustrated in FIGS. 5 and 6.
  • curves A and B represent the relation between the load and the magnitude of deformation under the load with respect to a hard metallic material A and a soft metallic material B, respectively, as classified according to the nature of materials.
  • Points A and B represent the respective elastic limits and, under a load lower than these points A and B the deformation can be restored to zero when the load is removed. Points A and B represent the respective breaking points.
  • the relation between the load and the magnitude of deformation for the metallic material which is to be discriminated is preliminarily determined (for example, as shown by the curve OA A and if the deformation of a metallic material after a predetermined load M within the elastic limit has been applied thereto and then removed therefrom is observed, it is possible to discriminate whether or not the observed metallic material consists of the desired metallic material.
  • reference numeral (1) designates a base member provided with a channel-shaped passage (11') having a predetermined depth, the cross-section of which is shown on the right side of FIG. 2, and which is adapted to the configuration of the metallic plate whose material is to be discriminated
  • reference numeral (2) designates a metallic plate whose material is to be discriminated and having a thickness equal to the depth of the passage (1) in the base member (1), plate (2) being illustrated as a circular metallic plate made of hard material in the drawings.
  • Reference numeral (3) designates a pressing device for applying a predetermined load M to this metallic plate (2) while being transferred, and this pressing device gives a deformation of such magnitude as necessitated for the discrimination, to the metallic plate (2).
  • Reference numeral (4) designates a deformation detecting device, which detects whether or not the metallic plate (2) once applied with the load M, retains a permanent deformation caused by the load M.
  • the device By the aid of the device as described above, it is possible to discriminate whether or not the metallic plate (2) is made of predetermined material through the step of applying a load M to the metallic plate (2) while being transferred along the passage (1) in the base member (1) by means of the pressing device (3) and then detecting by means of the deformation detecting device (4) whether or not a permanent deformation has been caused in the metallic plate (2) by load M.
  • reference (D) designates a conveyer belt disposed along the passage (1) so as to frictionally engage with the upper surface of the metallic plate (2), and driven in the direction of the arrow (E), for transferring the metallic plate (2) along the passage (1) in the base member (1).
  • the base member (1) is provided with a slot (1") at the position where the pressing device (3) is disposed, and above and below slot (1") are provided a depressing rller (5) and a support roller (C), respectively, in an opposed relationship.
  • the support roller (C) is fixedly disposed at the illustrated position and its shaft (6) is supported via a ball-and-roller bearing (7).
  • the depressing roller (5) has its shaft (8) coupled to an appropriate driving device (not shown) and thereby it is rotationally driven in the direction of the arrow (F) in FIG. 3. Still further, this depressing roller (5) has a structure such that it may be moved vertically without being rocked horizontally, as described in the following.
  • the shaft (8) is carried by a support member (9), and a support rod (10) projecting vertically from the upper surface of support member (9) extends through a guide cylinder (11).
  • the top portion of the support rod (10) is connected to a driving shaft (13) of a solenoid (12) by means of a bolt-nut assembly (14).
  • the solenoid (12) comprises an iron armature (15) to which the driving shaft (13) is fixedly secured, a stator iron core (17) and a coil (18) wound around the stator iron core (17).
  • the armature (15) When no current is flowing through the coil (18), the armature (15) is lifted up by the resilient restoring force of a spring (19). Also, at the position where the support roller (C) and the depressing roller (5) are opposed to each other, there is disposed a non-contact type of position detector (20) for detecting the fact that the metallic plate has been transferred up to the substantially center position of the rollers (C) and (5).
  • the position detector (20) feeds a detection output signal to an amplifier (21), whose output is connected to the coil (18) of the solenoid (12) via a current control circuit (22), which responds to the output signal of the amplifier (21) to make a switching operation for momentarily feeding a current to the coil (18) of the solenoid (12).
  • the magnitude of the current fed to the solenoid (12) is adjusted so as to apply a predetermined load to the metallic plate (2).
  • the gap distance between the opposed surfaces of the support roller (C) and the depressing roller (5) is preset so that said gap distance may be less by AT than the thickness of the metallic plate (2) when the metallic plate (2) is not present in this opposed gap space.
  • the noncontact type of position detector (20) When the metallic plate (2) has reached the substantially central position in the gap space between the support roller (C) and the depressing roller (5), the noncontact type of position detector (20) generates a signal.
  • This signal is amplified by the amplifier (21) and then applied to the current control circuit (22) which achieves a switching operation to provide a predetermined electric current flow through the coil (18). Therefore, the stator iron core (17) is magnetized, so that the armature (15 is attracted towards the stator iron core (17). Due to this attracting effect, the depressing roller (5) is depressed towards the support roller (C) by the intermediary of the driving shaft (13). In other words, the depressing roller (5) compresses the metallic plate (2), and thereby the metallic plate (2) is subjected to flexu 1 deformation.
  • the magnitude of the force transmitted to the depressing roller (5) due to the attraction of the armature iron core (15) towards the stator iron core (17), is varied in accordance with the travelling of the metallic plate (2) as shown in FIG. 4, where the attractive force is represented by P(t).
  • P represents the initial compression force caused by the resilient member (19), this initial compression force being far smaller than the attractive force P(t). Since the effective time of the force P(t) is only momentary, the travelling of the metallic plate (2) is not prevented at the position where the roller (C) and the roller (5) are opposed to each other.
  • the previously described conveyer belt (D) is disposed at a position displaced leftwardly from the center line of the passage (1) as viewed in FIG. 5 and, at the detecting position (G-G) a depressing force is applied onto the metallic plate (2) via the conveyer belt by the action of the depressing pulley (24) disposed on the same line as the conveyer belt (D).
  • Reference numeral (25) represents a tension spring for generating the pressing force of the depressing pulley or roller (241) against the metallic plate (2)
  • numeral (26) represents a fulcrum bearing
  • numerals (27) and (28) represent a bolt and an adjusting nut, respectively, for adjusting the height of the depressing pulley (24).
  • Detecting coils (29) and (30) are disposed so as to align with the line (GG) at the detecting position along the passage (1'), and also symmetrically with respect to the center line of passage (1').
  • the magnetic fluxes emanating from the detecting coils (29) and (30) are arranged so as to be substantially perpendicular to the metallic plate (2).
  • a position detector (23) consisting of a semiconductor photoelectric transducer element or the like, is provided at a position within the circumference of the metallic plate (2) in the proximity of its front edge as viewed in FIG. 5.
  • the metallic plate (2) which was preliminarily pressed by means of the abovedescribed pressing device (3), has been transferred-to the position of the detecting device (4) having the aforementioned construction by the action of the conveyor belt (D) from up to down as viewed in FIG. 5, while retaining its permanent deformation without changing its orientation with respect to the direction of the passage (1), that is, while maintaining the state where the metallic plate (2) is bent symmetrically with respect to the center line of the passage (1').
  • This state of the bent metallic plate (2) is shown by a broken line in FIG. 6, whereas a metallic plate (2) that is free of permanent deformation is shown by a solid line.
  • the metallic plate (2) having the permanent deformation is brought to the state where the side of the metallic plate opposite to the conveyer belt (D) with respect to the center line of the passage (1') is raised due to the depressing force exerted by the conveyer belt (D) and pulley 24.
  • This amount of rising is represented by AX.
  • the impedances of the detecting coils (29) and (30) are equal to each other and amount to Z,
  • the increment of this impedance varying in accordance with the material and the physical nature of the metallic plate (2) being represented by AZ
  • the increment of the impedance varying in accordance with the distance between the detecting coil (29) or (30) and the metallic plate (2) is represented by A2,
  • the impedances Z, and Z, of the detecting coils (29) and (30) are both affected by the material of the metallic plate (2), the impedance Z, of the detecting coils (29) and (30) are both affected by the material of the metallic plate (2), the impedance Z, of
  • the detecting coil (29) does not involve the increment of impedance AZ representing the effect of the distance change between the metallic plate (2) and coil (29) that might becaused by the flexual deformation, owing to the one-side pressing effect of the depressing roller (24). Consequently, if a circuit arrangement is constructed so that the difference between the impedances Z, and Z of the detecting coils (29) and (30) may be detected, then the impedance increment AZ caused by the deformation of the metallic plate (2) can be detected and thus the magnitude of deformation AX can be also detected.
  • the circuit arrangement for such a purpose is shown in FIG. 7.
  • reference numeral (33) designates an A.C. power supply, across which are connected the detecting coils (29) and (30) in series, and also across which are connected resistors (31) and (32) in series.
  • the junction point H between the detecting coils (29) and (30) and the junction point J between the resistors (31) and (32) are respectively connected to input terminals of a discriminator circuit (34) as described later.
  • the output of discriminator circuit (34) and the output of the aforementioned position detector (23) consisting of a semiconductor photoelectric transducer element or the like are connected to the respective inputs of an AND circuit (35).
  • the resistors (31) and (32) are adjusted so that the output voltage between the junction point H for the detecting coils (29) and (30) and the junction point J for the resistors (31) and (32) in FlG. 7 may become zero under the state where a metallic plate (2) made of a standard material and subjected to no deformation is opposed to the detecting coils (29) and (30), then an output voltage AE that is proportional to the magnitude of deformation AZ of the metallic plate (2) will be produced between junction points H and J when a bent metallic plate (2), as shown by a broken line in FIG. 6, is passing over the detecting coils (29) and (30).
  • the above-described deformation detecting device (4) operates according to an electromagnetic method, it is possible to discriminate the material of a metallic plate (2) travelling at a high speed.
  • a material discriminating device for metallic plates comprising an elongated base member having a passage of such dimensions as conform to configuration of plates whose material is to be discriminated as the plates are moved along said passage, pressing means positioned at a first point along said passage and operable, only when activated, to apply a predetermined load to metallic plates passing said first point, deformation detecting means positioned at a second point along said passage and operable, only when activated, to detect the magnitude of any permanent deformation of the metallic plates, passing said second point, caused by said pressing means, first plate detector means operable, responsive to detection of a plate at said first point, to activate said pressing means only when a plate is passing said first point, and second detector means operable responsive to detection of a plate at said second point, to activate said deformation detecting means only when a plate is passing said second point, whereby the material of metallic plates moving along said passage may be discriminated on the basis of the magnitude of the permanent deformation which depends upon the elastic limit of the metallic plates.
  • a material discriminating device for metallic plates in which the base surface of said passage is substantially flat and planar, said deformation detecting means comprising a conveyor belt extending along said passage at a location spaced substantially laterally to one side of the longitudinal center line of said passage, said conveyor belt being engageable with metallic plates to move the same along said passage; a second pressing roller mounted for rotation in a vertical plane intersecting said conveyor belt, means biasing said second pressing roller into engagement with said conveyor belt to press at least that portion of metallic plates disposed to one side of the longitudinal center line of said passage against the base surface of said passage, said second pressing roller engaging said conveyor belt at a detecting position line extending perpendicularly to the direction of movement of metallic plates along said passage, a pair of electromagnetic detecting windings positioned beneath said passage on said detecting position line and disposed symmetrically on opposite sides of the longitudinal center line of said passage, said second position detector being operable to detect entry of metallic plates beneath said second pressing roller, and signal means including said electromagnetic windings and said second position detector operable
  • a material discriminating device for metallic plates in which said second position detector generates a sampling pulse responsive to a metallic plate passing over said detecting position line, said signal means including a bridge circuit having said electromagnetic detecting windings connected in a differential relationship, and a discriminator circuit generating an output signal responsive only to simultaneous existence of said sampling pulse and an output signal of said bridge circuit exceeding a predetermined signal level.
  • a material discriminating device for metallic plates as claimed in claim 3, in which said signal means further includes an AND circuit having an input connected to said discriminator circuit and an input connected to said position detector.
  • a material discriminating device for metallic plates including a second material discriminating device detecting the electrical resistance of metallic plates by electromagnetic induction and comparing the detected value with a reference resistance value.
  • a material discriminating device for metallic plates as claimed in claim 1, in which said pressing means comprises a pair of rollers in mutually opposing relation and including a rotatable plate support roller mounted at a fixed position and a rotatable plate pressing roller mounted for vertical displacement, means rotating said pressing roller in the plate travel direction, resilient means biasing said pressing roller toward said support roller, electromagnetic means operatively connected to said pressing roller and selectively energizable to press said pressing roller against metallic plates at said first point along said passage and engaged by said support roller to impart a flexural deformation to the metallic plates, said first position detector being operable to detect entry of metallic plates between said rollers, and current control means connected to said electromagnetic means and to said first position detector and operable responsive to detection of a metallic plate entering between said rollers to energize said electromagnetic means momentarily to effect flexural deformation of the metallic plate.
  • a material discriminating device for metallic plates including vertically reciprocal mounting means rotatably mounting said pressing roller, said electromagnetic means including a magnetic stator, a magnetic armature connected to said mounting means and movable relative to said stator and an energizing winding wound on said stator and connected to said current control means.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
US00228994A 1971-03-27 1972-02-24 Material discriminating device for metallic plates Expired - Lifetime US3803908A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP1774771A JPS5115754B1 (de) 1971-03-27 1971-03-27
JP2143971U JPS5247513Y2 (de) 1971-03-27 1971-03-27
JP1775171A JPS5249354B1 (de) 1971-03-27 1971-03-27

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4848162A (en) * 1986-12-22 1989-07-18 Atomic Energy Of Canada Limited Elastodynamic testing of elongate compressible material
US4901585A (en) * 1988-11-30 1990-02-20 Westvaco Corporation Method and apparatus for roll nip load measurement
US5244162A (en) * 1992-02-20 1993-09-14 Automated Gasket Corp. Method and apparatus for providing uniform thickness rolls of gasket material
US6293007B1 (en) * 1996-05-30 2001-09-25 Sony Video (M) Sdn. Bhd. Mounting system
US20120238858A1 (en) * 2011-03-17 2012-09-20 Canon Kabushiki Kaisha Subject information acquisition apparatus and subject information acquisition method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19609881C1 (de) * 1996-03-13 1997-05-28 Tuev Bayern Sachsen E V Inst F Verfahren und Vorrichtung zum Erkennen des Materials eines Probekörpers

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2404584A (en) * 1944-12-30 1946-07-23 Firestone Tire & Rubber Co Bending modulus test apparatus
US3708354A (en) * 1971-06-09 1973-01-02 Anaconda American Brass Co Method and apparatus for measuring and controlling the continuous annealing of a long length of metal tubing

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2404584A (en) * 1944-12-30 1946-07-23 Firestone Tire & Rubber Co Bending modulus test apparatus
US3708354A (en) * 1971-06-09 1973-01-02 Anaconda American Brass Co Method and apparatus for measuring and controlling the continuous annealing of a long length of metal tubing

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4848162A (en) * 1986-12-22 1989-07-18 Atomic Energy Of Canada Limited Elastodynamic testing of elongate compressible material
US4901585A (en) * 1988-11-30 1990-02-20 Westvaco Corporation Method and apparatus for roll nip load measurement
US5244162A (en) * 1992-02-20 1993-09-14 Automated Gasket Corp. Method and apparatus for providing uniform thickness rolls of gasket material
US6293007B1 (en) * 1996-05-30 2001-09-25 Sony Video (M) Sdn. Bhd. Mounting system
US20120238858A1 (en) * 2011-03-17 2012-09-20 Canon Kabushiki Kaisha Subject information acquisition apparatus and subject information acquisition method
US20150223780A1 (en) * 2011-03-17 2015-08-13 Canon Kabushiki Kaisha Subject information acquisition apparatus and subject information acquisition method
US9462997B2 (en) * 2011-03-17 2016-10-11 Canon Kabushiki Kaisha Subject information acquisition apparatus and subject information acquisition method

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Publication number Publication date
DE2213983A1 (de) 1972-10-12
DE2213983B2 (de) 1975-02-13
DE2213983C3 (de) 1975-09-11

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