{"id":2077,"date":"2026-08-17T20:41:35","date_gmt":"2026-08-17T12:41:35","guid":{"rendered":"https:\/\/cncmachinecn.com\/?p=2077"},"modified":"2026-08-17T20:41:35","modified_gmt":"2026-08-17T12:41:35","slug":"cnc-bending-machine-tolerance","status":"publish","type":"post","link":"https:\/\/cncmachinecn.com\/zh\/cnc-bending-machine-tolerance\/","title":{"rendered":"CNC Bending Machine Tolerance &#8211; ISO Classes, DFM Rules and Accuracy Limits"},"content":{"rendered":"<h2>CNC Bending Machine Tolerance Standards and ISO 2768 Classes<\/h2>\n<p><strong>CNC bending machine tolerance<\/strong> on a press brake depends on ISO drawing classes, material springback, tooling wear, and real-time control compensation &#8211; not CAD angles alone. Achieving consistent CNC bending machine tolerance requires bridging the gap between CAD models and physical shop-floor mechanics. This guide maps ISO 2768 limits, air bending vs bottoming accuracy, DFM spacing rules, and how ProMach systems hold angle and flange repeatability on the shop floor.<\/p>\n<h3>ISO 2768 Breakdown: Linear and Angular Tolerances<\/h3>\n<p>In <a href=\"https:\/\/cncmachinecn.com\/product\/cnc-bending-machine-for-sheet-metal\/\">precision sheet metal fabrication<\/a>, <strong>ISO 2768<\/strong> serves as the universal baseline.<sup><a href=\"#ref-1\" class=\"cite-ref\" aria-label=\"Reference 1: ISO 2768 general tolerances\">[1]<\/a><\/sup> Most precision drawings apply <strong>ISO 2768-mK<\/strong>, balancing cost and part functionality.<sup><a href=\"#ref-1\" class=\"cite-ref\" aria-label=\"Reference 1: ISO 2768 general tolerances\">[1]<\/a><\/sup><\/p>\n<table>\n<thead>\n<tr>\n<th style=\"text-align: left;\">Tolerance Class<\/th>\n<th style=\"text-align: left;\">Target Precision<\/th>\n<th style=\"text-align: left;\">Ideal Application<\/th>\n<th style=\"text-align: left;\">Linear Tolerance (0.5-6mm)<\/th>\n<th style=\"text-align: left;\">Angular Tolerance (Short Side)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"text-align: left;\"><strong>f (Fine)<\/strong><\/td>\n<td style=\"text-align: left;\">High Precision<\/td>\n<td style=\"text-align: left;\">Aerospace, medical enclosures<\/td>\n<td style=\"text-align: left;\">\u00b10.05 mm<\/td>\n<td style=\"text-align: left;\">\u00b10\u00b020&#8242;<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\"><strong>m (Medium)<\/strong><\/td>\n<td style=\"text-align: left;\">Standard Industrial<\/td>\n<td style=\"text-align: left;\">Machine frames, brackets, chassis<\/td>\n<td style=\"text-align: left;\">\u00b10.10 mm<\/td>\n<td style=\"text-align: left;\">\u00b10\u00b030&#8242;<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\"><strong>c (Coarse)<\/strong><\/td>\n<td style=\"text-align: left;\">Heavy Structural<\/td>\n<td style=\"text-align: left;\">Agricultural equipment, chassis plates<\/td>\n<td style=\"text-align: left;\">\u00b10.20 mm<\/td>\n<td style=\"text-align: left;\">\u00b11\u00b000&#8242;<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\"><strong>v (Very Coarse)<\/strong><\/td>\n<td style=\"text-align: left;\">Rough Weldments<\/td>\n<td style=\"text-align: left;\">Non-functional guards, structural supports<\/td>\n<td style=\"text-align: left;\">\u00b10.50 mm<\/td>\n<td style=\"text-align: left;\">\u00b11\u00b030&#8242;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Bilateral vs. Unilateral Specifications Dictate Forming Methods<\/h3>\n<p>How your engineers specify tolerances dictates the forming process we must run on the shop floor:<\/p>\n<ul>\n<li><strong>Bilateral Callouts (e.g., 90\u00b0 \u00b10.5\u00b0)<\/strong>: Best suited for <strong>air bending<\/strong>. Air bending offers maximum machine flexibility, lower tonnage, and faster cycle times while holding standard <strong>forming tolerance<\/strong> limits.<\/li>\n<li><strong>Unilateral Callouts (e.g., 90\u00b0 +0.2\u00b0\/-0.0\u00b0)<\/strong>: Force production into <strong>bottoming<\/strong> or <strong>coining<\/strong>.<\/li>\n<li><strong>Bottoming<\/strong>: Stamp punches press the material into the V-die bed, reducing <strong>springback angle<\/strong> variance to hit tight angular repeatability. Requires 3x to 5x higher tonnage.<\/li>\n<li><strong>Coining<\/strong>: Burrys the punch tip into the sheet metal neutral axis to eliminate springback entirely. <\/li>\n<\/ul>\n<h3>Drawing Callout Best Practices<\/h3>\n<ul>\n<li><strong>Eliminate Blanket Block Tolerances<\/strong>: Over-specifying an entire sheet metal print to \u00b10.005&#8243; significantly increases tooling and inspection costs.<\/li>\n<li><strong>Isolate Functional Features<\/strong>: Apply tight tolerances strictly to critical fit-up features, such as mating flanges and mounting hole patterns.<\/li>\n<li><strong>Datum Management<\/strong>: Always dimension consecutive bends from a single primary datum point to eliminate tolerance stacking across complex multi-bend profiles.<sup><a href=\"#ref-2\" class=\"cite-ref\" aria-label=\"Reference 2: ASME Y14.5 dimensioning and tolerancing\">[2]<\/a><\/sup><\/li>\n<\/ul>\n<h2>Core Variables Driving CNC Bending Machine Tolerance<\/h2>\n<p>Holding tight tolerances in precision sheet metal fabrication isn&#8217;t just about punching numbers into a controller. <\/p>\n<h3>Material Mechanics and Springback<\/h3>\n<p>Raw material inconsistency is the primary driver of dimensional drift in <a href=\"https:\/\/cncmachinecn.com\/how-does-a-cnc-bending-machine-work\/\">press brake bending<\/a>:<\/p>\n<ul>\n<li><strong>Yield Strength Shifts:<\/strong> Alloy properties vary between heat lots. A spike in yield strength increases the <strong>springback angle<\/strong>, forcing the ram to over-bend to achieve the targeted <strong>bend angle<\/strong>.<\/li>\n<li><strong>Material Thickness Variance:<\/strong> Nominal sheet metal thickness fluctuates across a single sheet. In air bending, minor gauge variations alter punch penetration depth, shifting the final angle.<\/li>\n<li><strong>Grain Orientation:<\/strong> Bending parallel to the material rolling direction reduces ductility, changing the <strong>bend allowance<\/strong> and increasing cracking risks compared to transverse bends.<\/li>\n<\/ul>\n<h3>CNC Machine Hardware Positioning<\/h3>\n<p>Machine frame stiffness and axis positioning dictate long-term part repeatability:<\/p>\n<table>\n<thead>\n<tr>\n<th style=\"text-align: left;\">Hardware Variable<\/th>\n<th style=\"text-align: left;\">Impact on CNC Bending Machine Tolerance<\/th>\n<th style=\"text-align: left;\">Performance Benchmark<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"text-align: left;\"><strong>Backgauge Repositioning Accuracy<\/strong><\/td>\n<td style=\"text-align: left;\">Controls flange length precision and <strong>hole to bend distance<\/strong> repeatability.<\/td>\n<td style=\"text-align: left;\">+\/-0.01 mm repeatability<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\"><strong>Y1\/Y2 Synchronization<\/strong><\/td>\n<td style=\"text-align: left;\">Manages independent cylinder depth to keep the ram parallel across the full bed length.<\/td>\n<td style=\"text-align: left;\">Closed-loop proportional valves<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\"><strong>Crowning Compensation<\/strong><\/td>\n<td style=\"text-align: left;\">Eliminates machine bed flex under tonnage. <strong>Hydraulic crowning compensation<\/strong> dynamically adjusts pressure to stop center-boat angles.<\/td>\n<td style=\"text-align: left;\">Dynamic load-sensing crowning<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><img decoding=\"async\" src=\"https:\/\/cncmachinecn.com\/wp-content\/uploads\/2026\/08\/Precision_CNC_bending_machine_tolerance_BYO.webp\" alt=\"Precision CNC bending machine tolerance\"><\/p>\n<h3>Tooling Setup and Angle Measurement<\/h3>\n<p>Proper tooling selection and sensor integration mitigate environmental and wear factors:<\/p>\n<ul>\n<li><strong>V-Die Opening Ratios:<\/strong> Selecting an optimal <strong>V-die opening<\/strong> (typically 8x material thickness) stabilizes the inside <strong>bend radius<\/strong> and maintains predictable tonnage curves.<\/li>\n<li><strong>Punch Radius Wear:<\/strong> Worn tooling tips shift the neutral axis, throwing off pre-calculated <strong>k-factor<\/strong> and <strong>bend deduction<\/strong> figures in your CAD models.<\/li>\n<li><strong>Real-Time Optical Feedback:<\/strong> Integrated laser angle sensors measure the flange angle mid-stroke, automatically overriding ram positioning to defeat material springback instantly.<\/li>\n<\/ul>\n<h2>DFM Rules to Master CNC Bending Machine Tolerance<\/h2>\n<p>Ever had a batch of parts come off the press brake with stretched oval holes or warped flanges? Controlling <strong>cnc bending machine tolerance<\/strong> starts long before the sheet metal hits the backgauge. <\/p>\n<h3>Geometric Spacing and Feature Placement<\/h3>\n<p>Punching or laser-cutting holes too close to a bend line distorts the material as it stretches into the V-die. To protect your <strong>forming tolerance<\/strong> and part geometry, stick to these baseline layout rules:<\/p>\n<ul>\n<li><strong>Minimum Hole-to-Bend Distance:<\/strong> Keep holes, slots, and cutouts at a distance of at least <strong>2.5 times the material thickness plus the inside bend radius<\/strong>. If you must place a feature closer, add relief slots or plan for post-bend drilling.<\/li>\n<li><strong>Minimum Flange Length:<\/strong> A flange must bridge the V-die opening securely without slipping. Maintain a minimum flange length of <strong>4 times the sheet thickness<\/strong>. Shorter flanges slip into the die gap, throwing off your <strong>angular repeatability<\/strong> and flange height.<\/li>\n<li><strong>Flange Relief Cutouts:<\/strong> Always extend relief cuts beyond the bend line on partial flanges to avoid tearing the sheet metal at the corners.<\/li>\n<\/ul>\n<h3>Balancing K-Factor, Bend Allowance, and Bend Deduction<\/h3>\n<p>Getting a flat blank accurate down to the thousandth requires setting the correct sheet metal parameters in your 3D CAD software. A mismatch here ruins your overall <strong>cnc bending machine tolerance<\/strong> before bending even starts.<\/p>\n<table>\n<thead>\n<tr>\n<th style=\"text-align: left;\">Parameter<\/th>\n<th style=\"text-align: left;\">What It Measures<\/th>\n<th style=\"text-align: left;\">Impact on Precision Sheet Metal<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"text-align: left;\"><strong>K-Factor<\/strong><\/td>\n<td style=\"text-align: left;\">Ratio of neutral axis location to total <strong>material thickness<\/strong> (typically 0.30 to 0.50).<\/td>\n<td style=\"text-align: left;\">Controls flat pattern length calculation during material stretching.<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\"><strong>Bend Allowance<\/strong><\/td>\n<td style=\"text-align: left;\">Arc length of the neutral axis through the <strong>bend angle<\/strong>.<\/td>\n<td style=\"text-align: left;\">Determines exact material length added by the physical curve.<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\"><strong>Bend Deduction<\/strong><\/td>\n<td style=\"text-align: left;\">Amount subtracted from total outside dimensions to yield flat size.<\/td>\n<td style=\"text-align: left;\">Direct driver for laser cutting blank dimensions prior to <strong>press brake bending<\/strong>.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><img decoding=\"async\" src=\"https:\/\/cncmachinecn.com\/wp-content\/uploads\/2026\/08\/CNC_bending_machine_tolerance_DFM_rules_1W6.webp\" alt=\"CNC bending machine tolerance DFM rules\"><\/p>\n<p>We always test actual shop material lots to fine-tune our K-factor values in CAD rather than relying strictly on software defaults. Mild steel, aluminum, and stainless steel all stretch and deform differently under tension.<\/p>\n<h3>The 80\/20 Rule for Tolerancing Sheet Metal<\/h3>\n<ul>\n<li><strong>Isolate Functional Datums:<\/strong> Reserve tight dimensional callouts strictly for mating features, precision hole patterns, and critical mounting surfaces.<\/li>\n<li><strong>Loosen Non-Critical Features:<\/strong> Use standard <strong>ISO 2768-mK<\/strong> or general shop tolerances for overall length, open flanges, and aesthetic bends.<\/li>\n<li><strong>Account for Stock Variations:<\/strong> Raw mill sheet thickness varies from batch to batch. Demanding a overall part tolerance tighter than the stock thickness variation itself forces unnecessary, expensive grinding operations.<\/li>\n<\/ul>\n<h2>CNC Bending Machine Tolerance &amp; ProMach Capabilities<\/h2>\n<p>We engineer our <a href=\"https:\/\/cncmachinecn.com\/products\/cnc-bending-machine\/\">ProMach CNC bending systems<\/a> to tackle the physical limits of sheet metal fabrication. <\/p>\n<h3>Engineered Precision Limits<\/h3>\n<p>Maintaining consistent CNC bending machine tolerance requires tight physical controls on every stroke.<\/p>\n<ul>\n<li><strong>Angular Repeatability:<\/strong> Achieve dynamic bend angle control within \u00b10.3\u00b0 using real-time optical measurement.<\/li>\n<li><strong>Backgauge Repositioning Accuracy:<\/strong> High-precision servo drives hit \u00b10.01 mm backgauge repositioning accuracy for exact flange lengths.<\/li>\n<li><strong>Ram Positioning:<\/strong> Dual-axis Y1\/Y2 hydraulic synchronization maintains micro-meter repeatability across the entire bed length.<\/li>\n<\/ul>\n<h3>Intelligent Control Systems<\/h3>\n<p>Material batch variations usually throw off precision sheet metal accuracy. Our multi-axis controllers automatically calculate and compensate for sheet thickness variations on the fly.<\/p>\n<ul>\n<li><strong>Dynamic Springback Adjustment:<\/strong> Laser angle sensors read the springback angle mid-stroke and re-strike automatically to lock in the targeted angle.<\/li>\n<li><strong>Automated Hydraulic Crowning:<\/strong> Real-time hydraulic crowning compensation counteracts bed deflection, keeping bend angles straight from end to end.<\/li>\n<\/ul>\n<h3>Machine Format Comparison<\/h3>\n<p>Choosing between <a href=\"https:\/\/cncmachinecn.com\/product\/automatic-cnc-bending-machine\/\">press brake bending<\/a> and automated panel benders directly impacts your forming tolerance and unit cost.<\/p>\n<table>\n<thead>\n<tr>\n<th style=\"text-align: left;\">Feature \/ Capability<\/th>\n<th style=\"text-align: left;\">High-Tonnage CNC Press Brake<\/th>\n<th style=\"text-align: left;\">Servo-Electric Panel Bender<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"text-align: left;\"><strong>Best Application<\/strong><\/td>\n<td style=\"text-align: left;\">Heavy gauge, deep channels, custom profiles<\/td>\n<td style=\"text-align: left;\">Complex box shapes, high-volume light gauge<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\"><strong>Target Tolerance<\/strong><\/td>\n<td style=\"text-align: left;\">\u00b10.5\u00b0 angle \/ \u00b10.1 mm linear<\/td>\n<td style=\"text-align: left;\">\u00b10.2\u00b0 angle \/ \u00b10.05 mm linear<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\"><strong>Forming Method<\/strong><\/td>\n<td style=\"text-align: left;\">Air bending &amp; bottoming<\/td>\n<td style=\"text-align: left;\">Automated folding blades<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\"><strong>Cycle Speed<\/strong><\/td>\n<td style=\"text-align: left;\">Standard batch processing<\/td>\n<td style=\"text-align: left;\">High-speed automated operation<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><img decoding=\"async\" src=\"https:\/\/cncmachinecn.com\/wp-content\/uploads\/2026\/08\/high_precision_cnc_bending_machine_tolerance_uke.webp\" alt=\"high precision cnc bending machine tolerance\"><\/p>\n<h3>Custom Engineering &amp; Frame Rigidity<\/h3>\n<p>We custom-engineer our <a href=\"https:\/\/cncmachinecn.com\/about\/oem-odm-service\/\">OEM\/ODM<\/a> frame structures using stress-relieved solid steel frames to prevent deflection under peak tonnage, keeping your CNC bending machine tolerance tight over decades of heavy shop use.<\/p>\n<h2>CNC Bending Machine Tolerance FAQs<\/h2>\n<h3>What is the standard ISO 2768 tolerance for CNC sheet metal bending?<\/h3>\n<p>Most precision sheet metal operations rely on <strong>ISO 2768-mK<\/strong> as the default manufacturing standard.<sup><a href=\"#ref-1\" class=\"cite-ref\" aria-label=\"Reference 1: ISO 2768 general tolerances\">[1]<\/a><\/sup> Linear tolerances govern flange lengths and hole-to-bend positioning, while angular tolerances control bend angle variance.<\/p>\n<table>\n<thead>\n<tr>\n<th>Tolerance Class<\/th>\n<th>0.5 mm to 3 mm<\/th>\n<th>3 mm to 6 mm<\/th>\n<th>6 mm to 30 mm<\/th>\n<th>Angular (Short Side \u2264 10 mm)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>f (Fine)<\/strong><\/td>\n<td>\u00b10.05 mm<\/td>\n<td>\u00b10.05 mm<\/td>\n<td>\u00b10.10 mm<\/td>\n<td>\u00b11\u00b00&#8242;<\/td>\n<\/tr>\n<tr>\n<td><strong>m (Medium &#8211; Standard)<\/strong><\/td>\n<td>\u00b10.10 mm<\/td>\n<td>\u00b10.10 mm<\/td>\n<td>\u00b10.20 mm<\/td>\n<td>\u00b11\u00b030&#8242;<\/td>\n<\/tr>\n<tr>\n<td><strong>c (Coarse)<\/strong><\/td>\n<td>\u00b10.20 mm<\/td>\n<td>\u00b10.30 mm<\/td>\n<td>\u00b10.50 mm<\/td>\n<td>\u00b12\u00b00&#8242;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>How does sheet metal thickness variation affect CNC bending machine accuracy?<\/h3>\n<ul>\n<li><strong>Springback Shifts:<\/strong> A \u00b15% change in sheet thickness alters material stiffness, changing the springback angle by up to <strong>\u00b11.0\u00b0<\/strong> to <strong>\u00b11.5\u00b0<\/strong>.<\/li>\n<li><strong>Depth Penetration:<\/strong> In air bending, thicker sheet metal engages the die shoulders sooner, causing <strong>over-bending<\/strong>. Thinner sheets lead to <strong>under-bending<\/strong>.<\/li>\n<li><strong>Compensation:<\/strong> We eliminate thickness-induced errors using real-time optical angle measurement and dynamic crowning to maintain tight <strong>cnc bending machine tolerance<\/strong> limits across every batch.<\/li>\n<\/ul>\n<h3>What is the difference between air bending and bottoming tolerances?<\/h3>\n<p>Air bending provides flexibility and lower tonnage requirements, whereas bottoming forces tight angular repeatability through mechanical die contact.<sup><a href=\"#ref-4\" class=\"cite-ref\" aria-label=\"Reference 4: OSHA machinery guarding\">[4]<\/a><\/sup><\/p>\n<table>\n<thead>\n<tr>\n<th>Feature<\/th>\n<th>Air Bending<\/th>\n<th>Bottoming<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Angle Repeatability<\/strong><\/td>\n<td>\u00b10.5\u00b0 to \u00b11.0\u00b0<\/td>\n<td>\u00b10.25\u00b0 to \u00b10.5\u00b0<\/td>\n<\/tr>\n<tr>\n<td><strong>Linear Accuracy<\/strong><\/td>\n<td>\u00b10.20 mm to \u00b10.40 mm<\/td>\n<td>\u00b10.10 mm to \u00b10.20 mm<\/td>\n<\/tr>\n<tr>\n<td><strong>Tooling Versatility<\/strong><\/td>\n<td>High (Multiple angles with one V-die)<\/td>\n<td>Low (Dedicated punch\/die set per angle)<\/td>\n<\/tr>\n<tr>\n<td><strong>Tonnage Needed<\/strong><\/td>\n<td>Low (Standard baseline force)<\/td>\n<td>High (3x to 5x higher force)<\/td>\n<\/tr>\n<tr>\n<td><strong>Precision Control<\/strong><\/td>\n<td>Managed by CNC depth and real-time sensors<\/td>\n<td>Managed by physical punch and die coining force<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<div id=\"references\">\n<h2 id=\"references\">References<\/h2>\n<ol class=\"references-list\">\n<li id=\"ref-1\"><a href=\"https:\/\/en.wikipedia.org\/wiki\/ISO_2768\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">ISO 2768 &#8211; General tolerances (Wikipedia overview of ISO 2768-1 and ISO 2768-2)<\/a><\/li>\n<li id=\"ref-2\"><a href=\"https:\/\/www.asme.org\/codes-standards\/find-codes-standards\/y14-5-dimensioning-tolerancing\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">ASME Y14.5 &#8211; Dimensioning and Tolerancing<\/a><\/li>\n<li id=\"ref-3\"><a href=\"https:\/\/www.nist.gov\/mep\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">NIST Manufacturing Extension Partnership (MEP)<\/a><\/li>\n<li id=\"ref-4\"><a href=\"https:\/\/www.ecfr.gov\/current\/title-29\/part-1910\/subpart-O\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">eCFR Title 29 Part 1910 Subpart O &#8211; Machinery and machine guarding<\/a><\/li>\n<\/ol>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>CNC Bending Machine Tolerance Standards and ISO 2768 Classes CNC bending machine tolerance on a press brake depends on ISO [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2073,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2077","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blogs"],"_links":{"self":[{"href":"https:\/\/cncmachinecn.com\/zh\/wp-json\/wp\/v2\/posts\/2077","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cncmachinecn.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cncmachinecn.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cncmachinecn.com\/zh\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cncmachinecn.com\/zh\/wp-json\/wp\/v2\/comments?post=2077"}],"version-history":[{"count":1,"href":"https:\/\/cncmachinecn.com\/zh\/wp-json\/wp\/v2\/posts\/2077\/revisions"}],"predecessor-version":[{"id":2088,"href":"https:\/\/cncmachinecn.com\/zh\/wp-json\/wp\/v2\/posts\/2077\/revisions\/2088"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cncmachinecn.com\/zh\/wp-json\/wp\/v2\/media\/2073"}],"wp:attachment":[{"href":"https:\/\/cncmachinecn.com\/zh\/wp-json\/wp\/v2\/media?parent=2077"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cncmachinecn.com\/zh\/wp-json\/wp\/v2\/categories?post=2077"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cncmachinecn.com\/zh\/wp-json\/wp\/v2\/tags?post=2077"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}