DE2025642A1 - Device for determining the rate of rise of liquid metals in a casting mold and the like - Google Patents

Description

Patent attorneys DipL-ing. Amthor

Dipl.-Ing. wolf

6 Frankfurt a M *

MHtelw «12

United Austrian Iron and Steel Works Aktiengesellschaft, Linz (Austria)

Device for determining the rate of rise of liquid metals in a casting mold and the like.

The invention relates to a device for determining the rate of rise of liquid metals in Casting molds and the like, especially when casting in permanent molds.

Affected when pouring molten metals, especially steel in casting molds or chill molds the casting speed and the rate of rise dependent on it en »Metal in the mold is very strong the solidification process and the surface resistance dos cast product. The aim is therefore to bela & le @? Organg » especially when pouring τοη steel, which for you each ^ bilige Steel quality, steel temperature and for the form · »bsw. Eolcllleofursat most favorable pouring or stelggeeotiwiiidigkfli; stuete11en and during the entire uieSTorgmng wtder keep constant xu or according to gawlsiftxi ». eic3i b · β under * * uc d «r irfahruisg erfendtB Eiolitlinleii

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controllable change. Above all, a predetermined or preselected rate of rise should be used when pouring from below, with the molten metal entering at the bottom of the casting mold or ingot mold, are strictly adhered to.

So far, the rate of rise of the metals during the casting process has mainly been set empirically, of course, there are large deviations from the ideal rate of climb for the respective process occurrence. An improvement has been achieved in that weighing devices were built into the pouring crane, which make it possible to control exactly what amount of metal is cast in a predetermined time, after which then, since the shape size is known, the rate of climb can be regulated. But it has showed that crane scales only work satisfactorily if when built into new cranes. When installing in existing cranes, structural difficulties result constantly to disturbances of the scales, so that old steel works no possibility of this indirect kind of the measurement of the Have the rate of rise of liquid metals during the casting process. The scales are also very expensive and rough Steel mill operation prone to failure "

To regulate the delivery rate of the emptying pulse of a crucible for metals in the sense that the amount of metal delivered in the unit of time, delivered by the pump, remains constant regardless of the base level, b © r @ its © A fireproof float is provided, which via © in © mn ie »Seal out« at the end of a rack ts> ag @ Bc! @s Linkage ®is * Control valve in the gpeisaleitimg. © iaeo ii <§ Emptying pump »sti? © ib © i5 <i © B Dru © feluftaot @ g · © si3 © ®af "fe ₀ 1» .Sohvixsmer m »& fei · !? dl · atir actuation äes Yeiatiles aötweiaiigea

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or jerky rise of the swimmer under the action of the various loading forces he is exposed to is exposed, and furthermore only one motor is roughly regulated here, but no measurement the height of the bath level or the rate of descent of the Mirror height made. It is a stationary system that can be used for several casting molds or the like. for this reason alone and also because of the measurement inaccuracies to be expected and because of the bulkiness of the Transmission linkage appears excluded.

The object of the invention is to provide a simple device for determining the rate of climb Liquid metals in casting molds and the like., In particular when casting in chill molds, of which if necessary the casting device itself can also be controlled directly or indirectly, and furthermore can easily be used one after the other with different molds or other casting molds.

Using a heat resistant Float on the liquid metal, which actuates a sensor connected to 1hm, which latter the position or rate of rise of the swimmer in an electrically or electronically detectable measured variable converts, in a device of the type mentioned, the invention consists in that the Float through a flexible link, e.g. a rope or wire, with one through a spring or is connected via a torque limiter of a motor-driven take-up drum, which .Winder drum via an intermediate gear with a The generator or potentiometer serving as a transducer is drive-connected, the spring or

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the torque exerted on the drum by the torque limiter is equal to or less than that for free lifting the required rotation of the float is selected is, so that the controllable transducer depending on the float position through the drum only during the adjustment movement of the clamped » holding flexible pontic attached. Float is drivable »

When erfindungsgemäßezi Gate direction the sum drive DE® float and d @ s MeßwertgeiTbers forces required sum most part will come from practicing additional drive device so that the float even minimal control forces _"9 to achieve the desired control or Aaseige" That an exact determination of the position and rate of rise of the Sohwimmer depending on the bath surface of the metal is made possible. By using a flexible connecting link, a handy device is obtained, which can easily be transported from one mold to another when the connecting link is wound up.

The transducer can be used as a speed-increasing Gear-driven alternating current generator, the output of which is via a rectifier and optionally a voltage amplifier is connected to a display or writing device. One can Measuring transducer, however, can also be adjusted as a function of the swimmer's movement, at a constant voltage Form a horizontal potentiometer, either with an operational amplifier, integrator and analog-to-digital converter or is connected to a moving coil recorder, the sooting strip of which is driven, so that the vertical deflection controlled by the potentiometer of the writing instrument in connection with the

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Before the speed of the strip a measure of gives the rate of rise of the metal in the mold.

A converter can also be provided which has a number τon proportional to the rate of climb Emits impulses. In the simplest pail, such a converter consists of an interrupter that can be driven by the spring drum, which acts as a mechanical interrupter with an interrupter contact operated by a gearwheel but also as an optical interrupter, e.g. with a one Light beam of a photoelectric device interrupting perforated disk or also as a piezoelectric Transducer can be implemented *

A preferred embodiment is that the transducer or the like with the drive devices. in a closed, heat-resistant housing is housed, which can be attached to a mold wall and from which the wire holding the float or the like. is led out. Through this training, the gate direction easily moved from one mold or mold to the next.

The subject of the invention is illustrated by way of example in the drawing Pig. 1 a device according to the invention from the side

seen in section along the line I-I of the? ig. 2 and fig. 2 shows the device in plan view with the housing open.

The camouflaged impact device 1 is supported on the wall 2 of a mold and with the aid of brackets 3, 4 and a "le clamping screw" shown partial device 5 releasably attached. The gate direction has one fireproof Seawlaak body 7 that raged on the surface liquid metal poured into the mold 2 and sioh foait during the · GießTorf * ng «· moved upwards.

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The vertical position of the float 7 thus corresponds to the rate of rise of the metal in the mold. A rope or wire 8 is attached to the floating body via brackets (not shown), which is guided via a pulley 9 to a spring drum 10.

In the spring drum 10, on which the wire 8 can be wound, a spiral spring 11 is attached, the other end with an axis 12 on the the drum 10 is mounted, is rigidly connected, so that the spring 11 is tensioned when the wire 8 is unwound. The wire 8 is unwound when the floating body 7 is lowered before a measuring process on the bottom of the mold or casting mold. The spring force is to be selected so that it is indeed able to keep the wire 8 permanently taut and, in the exemplary embodiment, via a gear to drive a transducer consisting of an alternator, but still the float 7 » as long as he hangs freely on the wire, sees can lift.

The transmission 13 consists of one of the Spring drum 10 drivable pinion or friction wheel 14 »a gear wheel 15 and a further pinion 16, translates into sonelle and drives from pinion 16 via a coupling 17 to the alternator 18.

The alternating current generated by the alternator 18 is rectified by a rectifier 19 and fed to a display device 21. Between dim rectifier 19 and the display device 21 can via line 22 still a voltage amplifier 20, the Via line 23 connected to the display device 21 irfc, switched on «on. Obtr another line 24 buy »the appropriate uagef © rrat® Aueg & Bgs * - ■ pairauag de · Generator »autih one mioht shown

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Writing instrument "or a control device for regulation of the casting process, in which the latter for example, the rate of climb as a function of the measured variable obtained via line 24- corresponding influencing of the casting process on one Setpoint is adjusted. The display device and the writer are preferably calibrated so that they Show the pouring or rising speed of the metal in the mold or mold.

The entire device is accommodated in a housing 25 which has a carrying handle 26 is provided and so if necessary bu every mold or casting mold can be transported.

The illustrated embodiment is only given as an example and the gate direction can be in Modified within the scope of the possibilities indicated at the beginning.

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Claims (5)

Patent claims: 1. Gate direction to determine the rate of rise of liquid metals in semolina forms, etc., especially when casting in permanent molds, using a heat-resistant float on the liquid Metal that actuates a transducer connected to it, which the latter changes the position or rate of rise of the swimmer in an electrical or electronic manner converts detectable measured variable, characterized in that the floating body (7) by a flexible intermediate member (8), e.g. a rope or a wire, with a through a spring or a torque limiter from a motor-driven winding drum (10) is connected, which winding drum (10) via a Intermediate gear (15) is drive-connected to a generator (18) or potentiometer serving as a transducer, this being via the spring (11) or the Torque limiter on the drum (10) is less than the torque exerted to freely raise the Float (7) required torque is selected so that the transducer (18) controllable as a function of the float position by the Fasten the drum (10) only during the adjustment movement of the rope or wire (8) held under tension Floating body (7) can be driven. 2. * Device naoh claim 1, characterized in that the transducer is designed as an alternating current generator (18) which can be driven via a rotary-steel-increasing gear (13), the output of which is via a rectifier (19) and optionally a voltage amplifier (20) with an input or ■ Writing implement (21) connected 1st. 00988 2/13 8 0 - 9 - ■ · ■ ■■ '.:.' ■ 3. Apparatus according to claim 1, characterized in ■ records that the transmitter as a function of the float movement adjustable potentiometer is formed, which is connected to a constant current source and connected to an operational amplifier, integrator and analog-to-digital converter. 4. Apparatus naoh claim 1, characterized in that the transducer as a function of the Schwlmmerbewegung adjustable potentiometer lying on a sonatant power source and formed connected to a coil recorder. 5. Device according to one of claims 1 - * 4 _f gekennseiohnet that the transducer (18) with the drive «devices (10-17) in a closed, on a mold or mold wall (2) attachable öehäuee (25) is housed from which the float (7) holding wire (8) or the like. brought out 1st. ORIGINAL INSPECTED 009882/1380 4ο Blank page