Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
  • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
  • G01B7/28—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring contours or curvatures
  • G01B7/287—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring contours or curvatures using a plurality of fixed, simultaneously operating transducers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
  • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
  • B22D11/043—Curved moulds
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
  • B22D11/16—Controlling or regulating processes or operations

Definitions

• This invention relates to a device for measuring the inside dimensions of a cast iron mould according to the preamble of the appended claim 1.
• a cast iron mould in a continuous casting plant is often subjected to relatively strict tolerance demands in respect of its inside dimensions.
• a typical embodiment of a cast iron mould is a relatively long curved tube of a square or rectangular cross section.
• a measuring means is arranged movable within the cast iron mould on one or more guide rails, said measuring means comprising a rim with plates, each of which forming a capacitor together with an adjacent portion of the mould wall, and an electronic unit for generating and subsequently processing signals corresponding to the capacitances of the separate capacitors.
• the capacitors formed with the mould wall are preferably connected in oscillating circuits and the signals corresponding to the capacitances of the separate capacitors can be derived from the frequencies of the oscillating circuits.
• the measuring means according to the invention for each mould wall is preferably provided with a number of plates disposed beside each other parallel to the wall, opposite plates in the rim being connected in pairs in an oscillating circuit.
• Fig. 1 shows a cast iron mould with a mounted measuring device according to the invention
• Fig . 2 shows a section A-A through a mould and the measuring device according to Fig. 1.
• the cast iron mould 10 in Fig. 1 consists e.g. of a 700 mm long tube of a square or rectangular cross section.
• the tube has the same radius of curvature as the continuous casting path, e.g. 6 m.
• a movable slide with a measuring means 12 is arranged, which consists of a rim with plates for capacitive measurement of the inside dimensions of the cast iron mould and an electronic unit for supplying voltage to the measuring means and for processing the signals obtained from the capacitive measurement.
• Fig. 2 showing a section A-A through the cast iron mould 10 and the rim with plates of the measuring means 12, that the measuring means for each mould wall is provided with a number of plates arranged beside each other parallel to the wall.
• the rim according to Fig. 2 comprises in all 16 plates 1a to 8a and 1b to 8b which are distributed over the four walls of the mould in a way as is apparent from the drawing.
• the plates are arranged at a relatively short distance from the mould wall, preferably about 2 to 3 mm.
• the capacitance of the capacitor formed by one plate and the adjacent portion of the mould wall is a function of this distance the dimensions of the mould can be obtained from a capacitance measurement.
• the capacitance measurement can be performed via a frequency measurement. If opposite plates are connected in pairs a minor eccentricity of the guide rail will not influence the measurement result.
• Fig. 2 only one oscillating circuit is indicated by means of an oscillator coil 13 having the inductance L, connected to the plates 1a and 1b.
• Such an oscillating circuit is an oscillator of Colpitt type, the capacitance C of which is obtained as
• C a is the capacitance between the plate 1a and the adjacent portion of the mould wall and C b , is the capacitance between the plate 1b and the adjacent portion of the mould wall.
• the resonance frequency f of the Oscillating circuit is thus determined by
• Variations in frequency when the measuring means 12 is moved through the cast iron mould 10 thus correspond to the variations of the inside dimensions of the mould.
• the electronic unit which consists of conventional signal processing circuits is not shown in detail in the drawing.
• the signal from each oscillator can be supplied to a separate counter via a gate.
• This gate can be enabled by means of a signal from an optically or electronically readable marking on the guide rail and be kept enabled for a predetermined time during which the counter is advanced stepwise. When the gate has been disabled the contents of the counter is transferred to a storage and the counter is reset.
• the electronic unit After taking the measuring device out of the cast ironmould the electronic unit can be connected to a printer or a display unit where the contents of the storage is displayed after the necessary calculation to an absolute measure or a deviation from nominal measures.
• the storage can be made large enough to store data from several cast iron moulds.
• the measurement result can also be fed directly from the electronic unit to a printer or a display unit.
• the electronic unit can be battery-operated, which eliminates the need of a cable to the movable measuring means.

Applications Claiming Priority (1)

Publications (1)

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ID=8164806

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Cited By (1)

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• 1980
  • 1980-07-07 WO PCT/EP1980/000046 patent/WO1982000195A1/en not_active Application Discontinuation
  • 1980-07-07 AU AU62213/80A patent/AU6221380A/en not_active Abandoned
  • 1980-07-07 EP EP19800901483 patent/EP0056365A1/de not_active Withdrawn

Non-Patent Citations (1)

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