Company Profile - Vollmer America - Strip Width Gaugevollmeramerica.com/wp-content/uploads/Vabm-u5g.pdf · 2015-01-26 · VABM-e5 FRIEDRICH VOLLMER Feinme ßgerätebau GMBH, 58093

Strip Width Gauge

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Operating and Service Instructions

VABM-e5 erstellt am 25.2.2002 freigegeben am BemerkungenRev.01 Seiten: Name: Rietdorf Name: Name:

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Content .................................................................................................. Page

Safety Precautions, please read carefully! ................................................... 3

Intended use of this machine ......................................................................... 3

Spares .............................................................................................................. 3

Design and function ....................................................................................... 4

Operation ........................................................................................................ 8Power on / Zero setting ...................................................................... 8Set nominal size .................................................................................. 8To adjust the gauge position .............................................................. 8Digital indicator .................................................................................. 8Analog indicator ................................................................................. 9To check the measurement accuracy ................................................. 9To clean the gauge .............................................................................. 9

To calibrate the gauge .................................................................................. 10

Checking / Trouble Shooting ...................................................................... 11Measurement rollers ......................................................................... 11Measurement arms ............................................................................ 11Measurement transducer .................................................................. 11

Maintenance ................................................................................................. 13To replace the transducer / the hard metal pin ............................... 13Measurement arms ............................................................................ 14Measurement rollers ......................................................................... 15

Counter Module MO41................................................................... Appendix

Subject to change without prior notice

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FRIEDRICH VOLLMER Feinmeßgerätebau GMBH, 58093 Hagen, Verbandsstraße 60, � +49 (0) 2334/507-0 Fax +49 (0) 2334/53015

Safety Precautions, please read carefully!

This gauge is meant to be used exclusively as a fix mounted component ofa strip processing machine. The strip processing machine must not be start-ed up until a written statement was made that the entire machine (into whichthe gauge is installed) is in accordance with the regulations of the EG-Maschinen-richtlinie 89/392/EWG or , outside the EEC, with the local safety regula-tions. The manufacturer hereby points out, that this may include the installationof an appropriate protection device. The protection device (if one is neces-sary) has to be made in such a way that the operator can put the gauge downon the strip and lift it off the strip during the rolling process without facingany hazard by the running or by the possibly breaking strip.

This manual has to be handed to the machine operator, and one copy mustbe permanently available to operator and service personnel.

Nobody is allowed to work on or with the gauge, before he has read andunderstood this manual. Feel free to call the Vollmer company in case ofany questions (phone +49 2334 507 0).

Intended use of this machine

This gauge must be used exclusively for the measurement of cold strip orprofile as specified in the contract. It must be firmly installed in its intendedposition and connected as intended by the Vollmer company. Any altera-tion might cause damage. The maximum strip width on which the customerand the manufacturer agreed on must not be exceeded. Otherwise measure-ment errors may occur or the gauge might get damaged.

Spares

Please order spares referring to the part number and drawing number of theenclosed documentation drawings. To speed up our work, please do alsostate the Project number which is written as P-Nr. on the identity plate ofthe gauge. It is recommended to use the large drawings of the documenta-tion for ordering spare parts rather than to refer to this manual.

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VABM 4/00:

The gauge head is lifted to so that thestrip can easily be fed over the guiderollers. For measurement, the gauge headis lowered manually. The slidebase al-lows to shift the gauge across the passline.

Design and function

The Vollmer gauge VABM 4/00 E/R measures continuously the width of apassing strip or profile, e.g. on a slitter line. The measurement range may beindividually different, depending on the customers requirements. It is de-termined when the gauge is manufactured, eg. as 0-35mm.

Two movable measurement arms measure the edges of the strip while itpasses through the gauge. The arms measure the strip edges with measure-ment rollers and they can move apart or come closer when the measurementrollers follow the strip edges. Any alteration of the strip width is measuredby a transducer inside the gauge.

The transducer signal is passed on to the measurement electronics. Here itis digitally indicated and put out as analog signal as well as via a digitalinterface. In this way the measurement data can be used in a separate eval-uation computer for quality control documentation according to ISO 9000.

The two measurement rollers are pushed off the strip edge by a two waypneumatic cylinder. This cylinder is in many applications only used as achoke so that the rollers are slowly approaching to the strip edges. At heirtop end, the measurement arms are pushed apart by a pressure spring so thatthe measurement rollers are pushed against the strip edge.

The strip width nominal size (only available on the analog output and onlyaffecting the analog indicator) is set by a thumb wheel decade switch. Whena nominal size is set, the indication of the measurement value is reduced forthe nominal size. The indicator needle is on zero as long as the measuredstrip has the nominal width.

The digital indicator shows the actually measured strip width as absolutevalue.

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This VABM 4/00 has adjustable guide rollers. They allowto measure even very slim profile and strip. The rollershelp to extend the life of the measurement rollers by utiliz-ing all sections instead of wearing off only the middle.

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Strip width gauge VABM: Two measurement arms

A and B have a folding mechanism to move the

hard metal measurement rollers R apart or put

them together. In some applications, the two pneu-

matic cylinders P are used to press the meas-

urement rollers firmly against the edges of strip

ST. Other applications use only the spring at the

transducer MT. In such cases, one direction of

the pneumatic cylinder remains unused except

that it regulates the closing speed of the guide

rollers by the choke valve on its exhaust outlet.

If the gauge is not measuring, the guide rollers

are pulled apart to their limit stop (see pictures

on the right.)

The electronic transducer T measures the distance

between the measurement arms. It is fastened to

arm B and moves with it. The transducer ram is

pushed against a hard metal pin on arm A.

The handle H is used to swivel the gauge up and

down. The slidebase SF allows to shift the gauge

across the passline so that the strip runs always

over the center of the guide rollers F.

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In the normal measurement mode, the digital indicator shows the measured strip width.

The pushbutton OS is pressed to set the gauge to zero while the measurement rollers

are put together.

The thumb wheel switch is used for nominal size setting of the analogue indicator. A

diode flashes right beside the last digit, as long as the new nominal size was not read

into the measurement electronics by pressing the Start button. The diode is switched

to permanent light after value was read in. Not all gauges have such a thumb wheel

switch, e.g. none is installed when the nominal size is set on a PC.

Power on switches the entire system on and off. The pushbutton Switch

analogue voltage controls the indicator range.

See the text for details.

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Operation

Power on / Zero setting

The gauge needs to be set to zero after power-on, as the electronically savedzero may have been erased when the gauge was switched off. Go ahead inthe following way:

- Set POWER ON to 1- operate the pneumatic valve so that the measurement rollers are put to-

gether- press the OS button below the digital indicator to set the indication to

zero

Set nominal size

Set the thumb wheel decade switch S to the nominal size in microns. Thelast digit shows single microns. A nominal width of 30mm means to set thethumb wheels to 30 000. The diode behind the last digit flashes.

The press START. Now the measurement electronics read the nominal val-ue. The digital indicator shows a short message, e.g. 1P30000. This mes-sage means that the nominal value of 30000 microns (µm) was entered andthat the last digit of the digital indicator is 1/100mm, i.e. 10µm. Read theseparate instruction manual of the measurement module for details.

The diode in the thumb wheel switch stops flashing and is permanently onwhen the selected nominal size is read. The analogue indicator now showszero when the selected nominal width is measured while the digital indica-tor continues to show the measured width as absolute value.

To adjust the gauge position

With the gauge swivelled up, shift the slidebase to such a position that thestrip runs over the middle of the guide rollers. In that position tighten thescrew L to lock the slidebase. Now open the measurement rollers and swiv-el the gauge head down onto the strip.

Digital indicator

The digital indicator shows the measured strip width. In the default setting,the last digit is 10 µm. It is also possible to set the indication to 1µm or to

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100µm as last digit. This procedure is described in the separate manual forthe counter module.

The button OS sets the currently measured value to zero. For zero setting,there must be no strip in the gauge and the measurement rollers must be puttogether.

Analog indicator

An analog indicator which may be connected to the analog output indicatesthe measurement value reduced by the read nominal size (see before underSet nominal size).

The operator may select different indication ranges by pressing the push-button SWITCH ANALOG VOLTAGE. The following ranges are availa-ble, each of them corresponding to a measurement signal between -10V and+10V for the full deflection of the indicator needle:

± 30 µm± 100 µm± 300 µm± 1000 µm

A message shows the currently set analog indicator range when the buttonis pressed (e.g. H 1000 for the range ±1000 µm). The indicator switches tothe following range if the button is quickly pressed for a second time. Theindicator then shows the new range for a short moment. This setting re-mains saved even in the system was switched off.

To check the measurement accuracy

Put a slip gauge or a master straight between the measurement rollers. Thedigital indicator needs to show the exact width of the slip gauge or the ref-erence piece (if correctly positioned, so that the indication is the lowestvalue). If the deviation exceeds the tolerance, check the entire gauge.

To clean the gauge

Clean the surface of the measurement rollers so that no deposits can built upwhich would disturb the smooth running of the rollers.

The gauge should be cleaned regularly to prevent movable parts from be-coming blocked by dirt deposits. This is meant especially for the gap be-tween the holders of the measurement rollers

The inside of the gauge does not need any cleaning unless the measurementaccuracy is affected by dirt deposits inside the gauge.

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To calibrate the gauge

The gauge has been calibrated at the factory. New calibration is required if:

- a new transducer was installed, or- the measurement arms were mechanically changed, e.g. by replacing

bearings or- the linearisation data were erased.

Calibration is performed step by step. Nine caliper gauges are measuredone after the other and their size is read into a linearisation data file. Theprocedure is described in a separate instruction manual for the counter module.

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Checking / Trouble Shooting

Measurement rollers

� Deposits on the surface?Some strip materials leave deposits on the rollers. They cannot run smoothon the strip and might mark the strip.

� clean or replace rollers

� Surface worn ?If the rollers show only a single section of wear, you might alter themeasurement height for utilizing not worn roller sections. It is recom-mended to do so precautionary before a single section shows signs ofwear. If, after a long time of operation, the rollers are worn over theentire usable surface, then

� replace the rollers

� Clearance?The rollers have to move freely. They should have only little axial clearance.

� Replace defective rollers. If the roller surface is OK, replace only thebearings.

Measurement arms

� Parallel ?If the measurement rollers are put together, the light must come evenlythrough the gap. If not, check the measurement rollers, their axles andthe folding mechanism of the measurement arms and its bearings.

� replace defective or worn parts

� Lateral clearance ?The measurement arms may not have any detectable lateral clearance,i.e. the may not move in or against the running direction of the strip.If so,

� check the bearings in the measurement arm folding mechanism for wear

Measurement transducer

� Ram easy movable ?The transducer rams must be easy to be pushed in and spring back imme-diately. If not,

� replace the transducer

� The hard metal ball at the measurement tip worn or damaged?The ball must have a shining, even surface. if not,

� remove the transducer from the gauge and replace the measurement tip

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which is screwed to the transducer ram. Be careful not to bend the ramand not to damage its surface.

� Hard metal pin surface dirty or damaged ?The surface must be shining, flat and even. If not

� replace the hard metal pin HM

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Maintenance

The Vollmer VABM width gauge does not need much maintenance. In mostcases, only the guide rollers are subject to wear.

The transducer needs to be replaced, if the indication does not follow everymotion of the measurement arms, e.g. because the transducer is stuck ormoves too slow because of wear.

After a long time of operation, the bearings in the folding mechanism of themeasurement arms might be worn. This may be the same with hard metalpin opposite the transducer.

To replace the transducer / the hard metal pin

First remove the top side cover from the gauge head.

The transducer MT can be pulled off its clamp hole after the clamp screwKT was loosened. Before inserting a transducer, spread the measurementrollers as far as possible. Then push the transducer into the clamp hole up tothe limit stop (as shown below). The transducer ram must have some travelleft even if the rollers are apart for the maximum distance. That means thetransducer ram must not be pushed in to its limit stop (see the followingsections).

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The hard metal pin is clamped with clamp screw KH. The pin is installed insuch a position that the transducer ram has a little travel left to its limit stopwhile the measurement rollers are apart for the maximum distance.

To ensure this, spread the measurement rollers pneumatically or manuallyto their limit stop. Then insert the hard metal pin into its clamp hole andpush it in until the transducer reaches its limit stop. Now pull the hard metalpin back for about 0,5 mm and tighten the clamp screw KH to fasten thehard metal pin in that position.

Measurement arms

The bearings in the folding mechanism of the measurement arms need to befree of clearance. The surface of the measurement arms may not have dirtdeposits so that their motion is not impeded in any way.

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Measurement rollers

The hard metal measurement rollers R must be easy running and free ofclearance. If they have only sectional wear, they may be turned upside down.

To replace the measurement rollers R, remove one side panel from the gaugehead. Then turn out the Allen bolt RS from the top. Take care to well holdon to the measurement arm, so that its precision mechanics do not get dam-aged. Then pull the measurement roller out towards the top, turn it upsidedown and push it back into the lower holding. If the roller bearing sticksfirmly in the lower plate, remove this plate as well before driving the bear-ing out (see picture on the following page)

The closed cover plate must be at the top, the plate with the open bore mustbe at the bottom side of the measurement roller. This protects the bearingsfrom being permanently flushed with emulsion, but allows any liquid todrain off easily.

Replace defective bearings with new bearings. If the roller surface is OK,there is no need to replace it together with the defective bearings. However,if a roller is replaced, always replace the bearings as well.

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Gauge head installation

The gauge must be installed in the middle of the strip, exactly rectangular tothe passline, and the axles of the measurement rollers must stand perpen-dicular to the strip surface.

The limit stop screw HA must be set in such a way that the measurementrollers are exactly perpendicular to the guide rollers. In most cases this maybe checked with a water-level which is put on top of the gauge head. Alter-natively, put a plate onto the horizontal guide rollers and a use a square tocheck if the front side of the gauge head is rectangular to the plate.

This setting was adjusted at the first start-up on site. Usually there is noneed for re-adjustment.

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Notes

Documents

Company Profile - Vollmer America - Strip Width Gaugevollmeramerica.com/wp-content/uploads/Vabm-u5g.pdf · 2015-01-26 · VABM-e5 FRIEDRICH VOLLMER Feinme ßgerätebau GMBH, 58093