BookTitleMAGNET_GENERAL_CATALOG_2019

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MAGNET_GENERAL_CATALOG_2019

Magnetic ChucksHolding Power of Magnetic ChucksThe holding power varies largely depending on the type of magnetic chucks andmaterial, thickness and attractive area of workpieces and distribution of mass andsurface roughness of the attractive face of workpieces. The following graphs showtypical examples; you can refer to them for tendency. Please note, however, thatvalues differ slightly among chucks. Always locate workpieces in such a mannerthat the holding area is positioned over both the N and S poles.Holding Power and Pitch between PolesThere is no absolute rule for selection of pitches suitable for workpieces. Ageneral guide, however, is that the best condition for holding is that the thicknessof workpieces is 2 to 4 times the pitch.To attract a workpiece firmly, it should be placed over the N pole and S pole, andaccordingly, the attractive face of workpieces must at least be 3 times the pitch.■An example of holding power <>(1N≒0.1kgf)●Relation between attractive area ofworkpiece and holding powerTest piece thickness 25 mm, SS400 ground surface(N/cm2)150(cmAttractive area of test piece2 0 200 400 600 ) 0●Relation between thickness ofworkpiece and holding powerTest piece 50×50 mm, SS400 ground surface(N)6000KETZ5000KETN4000■An example of construction of rectangular electromagnetic chuck■An example of construction of rectangular permanent magnetic chuckSeparatorWaterproof layerIron coreCoilFace plateHolding power per unit area125100755025KETZKETNKET・KECMagnetic poleHolding power300020001000SeparatorKESLKET10 20 30(mm)Thickness of test pieceFace plate3■StandardsBody■An example of holding power <>(1N≒0.1kgf)●Relation between thickness of workpiece and holding powerMax. holding powerTest piece 50×50 mm, SS400 ground surface(N)3000RMA2500??????????2000???????? RMT・RMC1500RMWH・RMCW10005000?????????????????? RTHMax. holding powerTest piece 50×50 mm, SS400 ground surface(N)60050040030020010010 20 30(mm) 0Thickness of test pieceRMWH・RMCW(1N≒0.1kgf)●Relation between thickness of workpiece and holding powerTest piece 50×50 mm, SS400 ground surface(N)35005 10 15 20 25 30Thickness of test piece(mm)RTH1.0 2.0 3.0Thickness of test piece (mm)■An example of holding power <>Max. holding power300025002000150010005000EP-QEP-DEPT-DWMEPT-HEPTCaseMagnet0 25 50 75 100(%)SS400SUS430S45CS45C hardenedSKH2SKH2 hardenedFC400FC200Selection of grinding fluidBase plateIron core■Relation between material and holding power<>●Difference in holding power due to●Difference in holding power due tomaterials (%)attractive surface roughness (%)0255075100(%)SS400▽▽▽GSS400▽▽SS400▽SS400~The separator part of the chuck work faces is made of brass, resin, etc. Selectgrinding fluid that does not corrode these materials. For details, please consultwith grinding fluid suppliers.EnvironmentallyfriendlyThese magnetic chucks employ special resin forbonding attractive face structural members,instead of solder that is normally used, but is anenvironmentally hazardous substance.※The data shown in an example of holding power is reference datataken from typical models and does not indicate warrantedvalues.※Use the Facsimile Communication Form (Selection Data) at theend.Standards of electromagnetic chucksThe quality standards of electro-(mm)magnetic chucks have been estab-???????????????????????????????? Up to 300 Over 300 up to 600 Over 600 up to 900 Over 900lished as described in the right-side0.010.0150.020.025Surface roughness: 6.3S????????table for dimensional accuracyMounting face: Not convex.(flatness/parallelism), holding???????????0.020.030.040.05power, electrical performance (with-?????????????The holding power on the chuck face plate must be 98.1 N (10 kgf) or over in average and 49 N (5 kgf) or over in the weakest area.stand voltage/insulation resistance/-?????????????????Dielectric breakdown between the charged part and the body is not allowed. (1500 VAC, 1 min.)temperature rise limit) and water?????????????????????The insulation resistance must be 5ΩM or over. (Measured with 500 V insulation resistance tester)resistance including testing meth-?????????????????The temperature rise on the chuck work face must be below 15℃. (Powered on for 3 hours)ods.?????????????????When a chuck is immersed in water, no water must enter the inside or its insulation performance must not drop.Note: The standards for the holding power and temperature rise vary depending on models.