Control of Clamping Force with BAW... in Plastic Injection Molding Machines

Analog Sensors

Improve Performance,Protect Injection Molding Machines andIncrease Lifetime of Molds and Machinery

2

Housing sizeMountingOutput signalLinear range sl

Ordering code

Rated operational voltage Ue

Supply voltage UB

RippleRated insulation voltage Ui

Rated sensing distance se

Load resistance RL

No-load supply current I0 at Ue

Protected against polarity reversalShort circuit protected

Ambient temperature range Ta

Temperature drift at sl

Max. non-linearity at sl

Adjustment indication (end of linear range)

Degree of protection per IEC 60529Insulation classHousing materialMaterial of sensing faceConnectionNo. of wires × conductor cross sectionApprovalRecommended connector

M12×1flush

voltage 0...10 V0.5...2 mm

BAW M12MI-UAC20B-S04G

24 V DC15...30 V DC≤ 15 % of Ue

250 V AC1.25 mm≥ 2 kΩ

≤ 10 mAyesyes

–10...+70 °C≤ 5 % of Ua max.±3 % of Ua max.

yes

IP 67

CuZn nickel platedPA 12

connector

cULusBKS-B 19/BKS-B 20

Please add the cable material and length tothe ordering code for sensors with cable!PUR, length 3 m = BP03

tie-baranalog sensor BAW

Analog position sensors

Even the strongest shaft willstretch as a result of hydraulicforces. Analog sensors BAWcan detect and signal thischange in length with a signalthat is proportional to the lengthchange and the clamping forceof the monitored tie-bars.

Tie-bar elongation in plasticinjection molding machines

is a side-effect that can haveuseful implications.

Tie-bar elongation is proportio-nal to the clamping force inmechanical toggle clampingsystems. Depending on themachine size and clampingforce, during ordinary operationthe actual extension can be upto 2 mm (0.08"). This relativelylarge mechanical movementleads to an interestingapplication for Balluff BAWanalog inductive displacementsensors. A high-resolutionanalog device for measuringsmall displacements of metaltargets, the Balluff BAW candetect the extention of the tie-bar in-process, providingcontinuous measurement of theclamping force without the needfor expensive instrumentation.

The Balluff BAW detects theelongation of the tie bar whenplaced in front of the tie-barsurface at the side of thestationary platen. With anoperating range of up to 5 mmit provides the change of the

length with a repeatability of±10 µm (0,0004”), which issufficient in most cases andgives a great cost-performanceratio. Since there is no need tomodify the tie-bars, installationis simple and universal for alldiameters.

The application helps to preventtie-bar overload, machine wearand protects the expensivemolds from severe damage.Besides possible damages,worn out bushings and supportsof the platens will result in lossof accuracy if the machine isoperated permanently withoverload.

The performance of themachine and the quality of themolded products will beimproved by continuous controlof the clamping force. Whileincreased mechanical stress is aresult of too high force, nonfilledcavities and flash appears whenthe force is less than calculated.

Using Balluff BAW to control thisimportant machine parameterrepresents a significant lowercost solution compared to thetraditional strain gaugetechnology which is used foradjustment and quality controlin the maintenance process.

Balluff BAW are available indifferent sizes and sensingdistances:

M12, M18

3www.balluff.de

M18×1flush

voltage 0...10 V1...5 mm

BAW M18MI-UAC50B-S04G

24 V DC15...30 V DC≤ 15 % of Ue

250 V AC3 mm≥ 2 kΩ

≤ 10 mAyesyes

–10...+70 °C≤ 5 % of Ua max.±3 % of Ua max.

yes

IP 67

CuZn nickel platedPBT

connector

cULusBKS-B 19/BKS-B 20

M18×1flush

voltage 0...10 V1...5 mm

BAW M18ME-UAC50B-S04G

24 V DC15...30 V DC≤ 15 % of Ue

75 V DC3 mm≥ 2 kΩ

≤ 10 mAyesyes

–10...+70 °C≤ 5 % of Ua max.±3 % of Ua max.

yes

IP 67

CuZn nickel platedPBT

connector

cULusBKS-B 19/BKS-B 20

M12×1flush

voltage 0...10 V0.5...2 mm

BAW M12MG2-UAC20B-

24 V DC15...30 V DC≤ 15 % of Ue

250 V AC1.25 mm≥ 2 kΩ

≤ 10 mAyesyes

–10...+70 °C≤ 5 % of Ua max.

±3 % of of Ua max.yes

IP 67

CuZn nickel platedPA 12cable

3×0.34 mm2

cULus

M12×1non-flush

voltage 0...10 V1...4 mm

BAW M12MF2-UAC40F-

24 V DC15...30 V DC≤ 15 % of Ue

250 V AC2.5 mm≥ 2 kΩ

≤ 10 mAyesyes

–10...+70 °C≤ 5 % of Ua max.±3 % of Ua max.

yes

IP 67

CuZn nickel platedPBTcable

3×0.34 mm2

cULus

M18×1flush

voltage 0...10 V1...5 mm

BAW M18ME-UAC50B-

24 V DC15...30 V DC≤ 15 % of Ue

75 V DC3 mm≥ 2 kΩ

≤ 10 mAyesyes

–10...+70 °C≤ 5 % of Ua max.±3 % of Ua max.

yes

IP 67

CuZn nickel platedPBTcable

3×0.34 mm2

cULus

Analog SensorsANALOG

For more sensors see maincatalog "The Sensor Line"on CD-ROM or online!

Analog SensorsConnectors, Approach Curve,Processing Programmable Switchpoints

BKS-B 19straight

BKS-B 19-1-_ _

10...30 V DCmolded-on PVC/PUR

3×0.34 mm²/4×0.25 mm²IP 67

–25...+ 85 °C

BKS-B 20angle

BKS-B 20-1-_ _

10...30 V DCmolded-on PVC/PUR

3×0.34 mm²/4×0.25 mm²IP 67

–25...+ 85 °C

ConnectorType

No LED

Supply voltage UB

CableNo. of wires × conductor cross sectionDegree of protection per IEC 60529Ambient temperature range Ta

Application examples

Some of the numerousapplications in measuringand controlling include:

– Distance measurement– Thickness measurement– Run-off measurement– Belt/band width

measurement– Detection of surface waves– Counting– Positioning– Position monitoring– General monitoring– Selection of parts of

various sizes andmaterials

Features

– Distance-proportionalanalog signal

– Housing sizes M8...80×80– Sensing ranges 1...50 mm– Non-contact, absolute

operating principle– High repeat accuracy– Low temperature drift– LED for setup aid– Compact, sealed, rugged

and reliable

Approach curve

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Please add the cable material and length to the ordering code!PUR, length 3 m = PU-03

Sensing arotating object

Eccentric cams, lobesor imbalances result ina periodic change of theoutput signal.

Lateral approach

Detecting larger travelby sensing an inclinedsurface.

Sensingvarious materials

With the distanceconstant, the outputsignal will change onlyof the object materialchanges.

Axial approach

Distance changes in thesensor axis result inproportionally changingoutput signals.

Balluff GmbHSchurwaldstrasse 973765 Neuhausen a.d.F.GermanyPhone +49 (0) 71 58/1 73-0Fax +49 (0) 71 58/50 10E-Mail: balluff@balluff.de

www.balluff.de

Processing programmableswitchpoints