{"id":594,"date":"2020-08-24T00:12:30","date_gmt":"2020-08-23T15:12:30","guid":{"rendered":"http:\/\/www.koyo-machine.co.jp\/?page_id=594"},"modified":"2020-11-30T23:14:04","modified_gmt":"2020-11-30T14:14:04","slug":"air","status":"publish","type":"page","link":"https:\/\/www.machine.jtekt.co.jp\/english\/product\/precision\/air\/","title":{"rendered":"\u30a8\u30a2\u8ef8\u53d7\u30b9\u30d4\u30f3\u30c9\u30eb\u30e6\u30cb\u30c3\u30c8"},"content":{"rendered":"<main id=\"product\" class=\"precision sum air\">\r\n    <article id=\"top\" class=\"contentsWrap\">\r\n\r\n        <div class=\"pageHeader\">\r\n            <h1 class=\"pageMainTitle\"><a href=\"https:\/\/www.machine.jtekt.co.jp\/english\/product\/product\/precision\/air\/\">Air Bearing <br class=\"sp\">Spindle Units<\/a><\/h1>\r\n        <\/div>\r\n\r\n        <section>\r\n            <div class=\"inner\">\r\n                <p class=\"bred\"><a href=\"https:\/\/www.machine.jtekt.co.jp\/english\/\">Home<\/a><span class=\"arrowRight1\">&gt;<\/span><a href=\"https:\/\/www.machine.jtekt.co.jp\/english\/product\/\">Product Information<\/a><span class=\"arrowRight1\">&gt;<\/span><a href=\"https:\/\/www.machine.jtekt.co.jp\/english\/product\/precision\/\">Precision Mechanical Equipment<\/a><span class=\"arrowRight1\">&gt;<\/span><a href=\"https:\/\/www.machine.jtekt.co.jp\/english\/product\/precision\/#anc01\">Spindle Units<\/a><span class=\"arrowRight1\">&gt;<\/span>Air Bearing Spindle Units<\/p>\r\n\r\n\r\n                <ul class=\"productLinkList leftIcon flexBox pt45 pb10\">\r\n                    <li><h3><a href=\"https:\/\/www.machine.jtekt.co.jp\/english\/product\/precision\/#anc01\">Spindle Units<\/a><\/h3><\/li>\r\n                    <li><h3><a href=\"https:\/\/www.machine.jtekt.co.jp\/english\/product\/precision\/#anc02\">Ball Screws<br \/>XY Tables and Linear Actuators<\/a><\/h3><\/li>\r\n                    <li><h3><a href=\"https:\/\/www.machine.jtekt.co.jp\/english\/product\/precision\/#anc03\">Indexing Chucks<\/a><\/h3><\/li>\r\n                <\/ul>\r\n\r\n                <!------\/\/.productLinkList + .productLinkList2------->\r\n\r\n                <ul class=\"productDetailList\">\r\n                    <li class=\"productDetailListBlock\" id=\"anc01\">\r\n                        <h4 class=\"productTitle type2\">Air Bearing Spindle Units<i class=\"fas fa-angle-double-down\"><\/i><\/h4>\r\n                        <div class=\"acoWrap\">\r\n\r\n                            <h5 class=\"subTitle\">4.1 Description<\/h5>\r\n                            <p class=\"mt25\">For manufacturing equipment of semiconductors and IT devices, it is important to maintain high accuracy flatness of wafers in the grinding process. Therefore, high runout accuracy is required for spindles used in such a process. Especially, NRRO (Non-Repeatable Runout) is required among rotational accuracy. To meet this requirement, we have newly developed air bearings that use porous graphite and obtained high accuracy NRRO.\r\n                            <\/p>\r\n\r\n\r\n\r\n                            <h5 class=\"subTitle mt75\">4.2 Features<\/h5>\r\n\r\n                            <ul class=\"mt25 lh19 midashiList\">\r\n                                <li><span>\uff081\uff09<\/span>Includes air bearings with porous throttling,these spindle units have high rigidity when compared to other types that utilize bearings with orifice throttling, spontaneous throttling, etc.<\/li>\r\n                                <li><span>\uff082\uff09<\/span>Reusable after slight contact since adhesion does not occur in contact with the rotating axis because of the self-lubricity of graphite.<\/li>\r\n                                <li><span>\uff083\uff09<\/span>High rotational accuracy: NRRO (Non-Repeatable Runout) 0.05 \u03bcm or less<\/li>\r\n                                <li><span>\uff084\uff09<\/span>Energy saving effect with air consumption minimized to 40 NL\/min or less.<\/li>\r\n                            <\/ul>\r\n\r\n\r\n                            <h5 class=\"subTitle mt75\">4.3 Principle of Air Bearing<\/h5>\r\n                            <p class=\"mt30\">As shown in Fig. 4.1, an air bearing consists of the rotating main axis and a ring or flat plate made of porous graphite to support rotation. Its performance depends on the gap amount between them and the air pressure applied there.<\/p>\r\n\r\n\r\n                            <h6 class=\"mt35\">\u25a0Fig. 4.1 Principle of Air Bearing<\/h6>\r\n                            <figure class=\"mt10 borderBox\">\r\n                                <img decoding=\"async\" src=\"https:\/\/www.machine.jtekt.co.jp\/english\/wp-content\/uploads\/2020\/08\/img_air_01eng_.png\" alt=\"\u25a0Figure4.1 Principle of Air Bearing\" class=\"pc\">\r\n                                <img decoding=\"async\" src=\"https:\/\/www.machine.jtekt.co.jp\/english\/wp-content\/uploads\/2020\/08\/img_air_01eng_.jpg\" alt=\"\u25a0Figure4.1 Principle of Air Bearing\" class=\"sp\">\r\n                                <img decoding=\"async\" src=\"https:\/\/www.machine.jtekt.co.jp\/english\/wp-content\/uploads\/2020\/08\/img_air_01_sp2eng.png\" alt=\"\u25a0Figure4.1 Principle of Air Bearing\" class=\"sp mt20\">\r\n                            <\/figure>\r\n\r\n\r\n                            <h5 class=\"subTitle mt75\">4.4 Characteristics of Radial Bearings<\/h5>\r\n\r\n                            <p class=\"mt30\">\uff081\uff09Basic load capacity<br \/><span class=\"block pl40\">The basic load capacity is represented as in the following formula, using the size of the radial bearing attached to the spindle and the supplied air pressure.<br \/>Base load capacity = (Bearing internal diameter) x (Bearing width) x (Average pressure) <br \/>Average pressure = Supplied air pressure \/ 2<\/span>\r\n                            <\/p>\r\n                            <p class=\"mt40\">\uff082\uff09Radial rigidity<br \/><span class=\"block pl40\">The radial rigidity is obtained by dividing the basic load capacity by the gap amount of the bearing as shown in the following formula.<br \/>Radial rigidity = Basic load capacity\/radial gap (radius)<\/span><\/p>\r\n                            <p class=\"mt40\">\uff083\uff09Example calculation<br \/><span class=\"block pl40\">With bearing internal diameter 70 mm,bearing width 70 mm, bearing gap 0.009 mm and supplied air pressure 0.5 MPa<br \/>Base load capacity = 1,225 N<br \/>Radial rigidity = 136 N\/\u03bcm<\/span><\/p>\r\n\r\n                            <h5 class=\"subTitle mt75\">4.5 Characteristics of Axial Bearing<\/h5>\r\n\r\n                            <p class=\"mt30\">\uff081\uff09Basic load capacity<br \/><span class=\"block pl40\">\r\n                                The basic load capacity is represented in the following formula, using the size of the axial bearing attached to the spindle and the supplied air pressure.<br \/>\r\n                                Basic load capacity = ((Bearing outer diameter)<span class=\"small\">2<\/span>\uff0d(Bearing internal diameter)<span class=\"small\">2<\/span>)  \uff0f 4 \u00d7 \u03c0 \u00d7\uff08Average pressure\uff09<\/span>\r\n                            <\/p>\r\n                            <p class=\"mt40\">\uff082\uff09Axial rigidity<br \/><span class=\"block pl40\">\r\n                                The axial rigidity is obtained by dividing the basic load capacity by the gap amount of the bearing as shown in the following formula.<br \/>Axial rigidity = Basic load capacity \/ Axial gap (one side)<\/span><\/p>\r\n                            <p class=\"mt40\">\uff083\uff09Example calculation<br \/><span class=\"block pl40\">\r\n                                With bearing external diameter 145 mm, bearing internal diameter 75 mm, bearing gap 0.009 mm and supplied air pressure 0.5 MPa<br \/>\r\n                                Base load capacity = 3,023 N<br \/>\r\n                                Axial rigidity = 330 N\/\u03bcm<\/span><\/p>\r\n\r\n\r\n                            <h5 class=\"subTitle mt75\">4.6 Structure<\/h5>\r\n                            <figure class=\"mt40 borderBox w55p\">\r\n                                <img decoding=\"async\" src=\"https:\/\/www.machine.jtekt.co.jp\/english\/wp-content\/uploads\/[show_air_img1&#039;]\" alt=\"\u25a0structure\" >\r\n                            <\/figure>\r\n\r\n\r\n\r\n                            <h5 class=\"subTitle mt75\">4.7 Main Dimensions and Accuracy<\/h5>\r\n\r\n                            <div class=\"w100p brH0\">\r\n\r\n                                <table class=\"sumTable type1 mt40\">\r\n                                    \r\n                                <\/table>\r\n                            <\/div>\r\n\r\n                            <div class=\"w100p brH0\">\r\n                                <table class=\"sumTable type1 mt40 txtC\">\r\n                                    \r\n                                <\/table>\r\n                            <\/div>\r\n                        <\/div>\r\n                    <\/li><!--\/anc01-->\r\n\r\n                    <li class=\"productDetailListBlock mt40 pt0\" id=\"anc02\">\r\n                        <h4 class=\"productTitle type2\">Contact Us<i class=\"fas fa-angle-double-down\"><\/i><\/h4>\r\n                        <div class=\"acoWrap\">\r\n\r\n                            <p>If you have any questions about our products, please contact us.<\/p>\r\n\r\n\r\n                            <div class=\"pageFooterLink\">\r\n                                <a href=\"https:\/\/www.machine.jtekt.co.jp\/english\/contact1\/\" target=\"_blank\" class=\"linkBox afterArrow\">Contact Us<\/a>\r\n                            <\/div>\r\n\r\n\r\n                        <\/div>\r\n                    <\/li><!--\/anc02-->\r\n\r\n                <\/ul>\r\n\r\n            <\/div><!--\/inner-->\r\n        <\/section>\r\n\r\n    <\/article>\r\n<\/main>\r\n<script>\r\n    $(window).on('load',function(){\r\n        $('.brH0 br:nth-of-type(n+2)').remove();\r\n        $('.brH0 table').prev('br').remove();\r\n    });\r\n\r\n<\/script>","protected":false},"excerpt":{"rendered":"Air Bearing Spindle Units Home&gt;Product Information&#038;g [&hellip;]","protected":false},"author":2,"featured_media":0,"parent":541,"menu_order":0,"comment_status":"open","ping_status":"open","template":"product-machine-air-temp.php","meta":{"footnotes":""},"class_list":["post-594","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.machine.jtekt.co.jp\/english\/wp-json\/wp\/v2\/pages\/594","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.machine.jtekt.co.jp\/english\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.machine.jtekt.co.jp\/english\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.machine.jtekt.co.jp\/english\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.machine.jtekt.co.jp\/english\/wp-json\/wp\/v2\/comments?post=594"}],"version-history":[{"count":1,"href":"https:\/\/www.machine.jtekt.co.jp\/english\/wp-json\/wp\/v2\/pages\/594\/revisions"}],"predecessor-version":[{"id":2878,"href":"https:\/\/www.machine.jtekt.co.jp\/english\/wp-json\/wp\/v2\/pages\/594\/revisions\/2878"}],"up":[{"embeddable":true,"href":"https:\/\/www.machine.jtekt.co.jp\/english\/wp-json\/wp\/v2\/pages\/541"}],"wp:attachment":[{"href":"https:\/\/www.machine.jtekt.co.jp\/english\/wp-json\/wp\/v2\/media?parent=594"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}