Prefer Jinan Green and fine-grained dense diabase granite; prohibit coarse-grained, layered, or cracked materials:
Mohs hardness HS\u226570, wear and scratch resistant;
Water absorption rate \u22640.15%, avoiding deformation due to temperature and humidity-induced water absorption;
Coefficient of linear expansion \u22644.5\u00d710\u207b\u2076\/\u2103, excellent thermal stability;
Free of mica, sulfides, dark cracks, sand holes, and air pores;
High elastic modulus, minimal deflection under compression huishijm.c\u2026<\/li>\n\n\n\n
After rough cutting, the raw block must undergo constant-temperature natural aging for 72~168h to release billion-year-old geological stresses cutting mechanical stresses; high-precision 000\/00 grade plates undergo an additional constant-temperature static rest to prevent long-term slow warping deformation of the finished product Jiancaiwang.<\/li>\n\n\n\n
Petrographic analysis, hardness, water absorption rate, dimensional uniformity, internal ultrasonic flaw detection (to screen for hidden cracks); unqualified raw blocks are scrapped directly.
II. Full-Process Manufacturing Quality Control (Process Precision Convergence)
Complete process chain: Rough cutting \u2192 Rough milling and shaping \u2192 Aging \u2192 Semi-precision grinding \u2192 Precision grinding \u2192 Ultra-precision polishing \u2192 Drilling \/ Slotting \u2192 Full inspection, with mandatory closed-loop inspection for each process.<\/li>\n\n\n\n
Constant temperature, constant humidity, dust-free, and anti-vibration workshop:
Temperature: 20\u2103\u00b10.5\u2103, hourly fluctuation <0.3\u2103;
Humidity: 45%~55% RH, to prevent hygroscopic expansion;
Independent vibration isolation foundation, vibration acceleration <0.01g;
Class 10,000 air cleanliness, to avoid abrasive scratches on the working surface Huagong Yiqiwang.<\/li>\n\n\n\n
Progressive grinding with multi-stage diamond abrasives to gradually converge flatness error:
Rough grinding 80~120 grit: Remove milling tool marks, flatness \u22640.02mm\/m;
Semi-precision grinding 240~400 grit: Ra\u22643.2\u03bcm;
Precision grinding 800~3000 grit: Working surface Ra\u22640.63\u03bcm;
000\/00 grade ultra-polishing: Cerium oxide polishing, Ra\u22640.0<\/li>\n<\/ol>\n\n\n\n
III. Precise Measurement Methods for Key Geometric Accuracy of Finished Products Mandatory Measured Indicators: Surface waviness, side perpendicularity, top and bottom surface parallelism, surface roughness, appearance defects, rated load deflection. Douyin Baike.<\/p>\n\n\n\n (II) Four Mainstream High-Precision Measurement Methods (from low to high accuracy)<\/p>\n\n\n\n (III) Auxiliary Form and Position Accuracy Measurement IV. Factory Finished Product Quality Control and Certification System \u0627\u0644\u0642\u064a\u0627\u0633 \u0627\u0644\u062f\u0642\u064a\u0642 \u0648\u0645\u0631\u0627\u0642\u0628\u0629 \u0627\u0644\u062c\u0648\u062f\u0629 \u0644\u0623\u0644\u0648\u0627\u062d \u0627\u0644\u062c\u0631\u0627\u0646\u064a\u062a \u0627\u0644\u062f\u0642\u064a\u0642\u0629: \u062a\u064f\u0633\u062a\u062e\u062f\u0645 \u0623\u0644\u0648\u0627\u062d \u0627\u0644\u062c\u0631\u0627\u0646\u064a\u062a \u0627\u0644\u062f\u0642\u064a\u0642\u0629 (\u062d\u062c\u0631 \u0627\u0644\u062c\u0631\u0627\u0646\u064a\u062a) \u0643\u0645\u0633\u062a\u0648\u0649 \u0645\u0631\u062c\u0639\u064a \u0641\u064a \u0639\u0644\u0645 \u0627\u0644\u0642\u064a\u0627\u0633\u060c \u0648\u0622\u0644\u0627\u062a \u0627\u0644\u0642\u064a\u0627\u0633 \u0627\u0644\u0645\u0646\u0633\u0642\u0629 (CMM)\u060c \u0648\u0627\u0644\u0641\u062d\u0635 \u0627\u0644\u0628\u0635\u0631\u064a\u060c \u0648\u0627\u0644\u062a\u062c\u0645\u064a\u0639 \u0627\u0644\u062f\u0642\u064a\u0642. \u062a\u0646\u0642\u0633\u0645 \u0639\u0645\u0644\u064a\u0629 \u0627\u0644\u0645\u0631\u0627\u0642\u0628\u0629 \u0627\u0644\u0623\u0633\u0627\u0633\u064a\u0629 \u0625\u0644\u0649 \u0633\u062a\u0629 \u0623\u0642\u0633\u0627\u0645 \u0631\u0626\u064a\u0633\u064a\u0629: \u0645\u0631\u0627\u0642\u0628\u0629 \u062c\u0648\u062f\u0629 \u0627\u0644\u0645\u0648\u0627\u062f \u0627\u0644\u062e\u0627\u0645\u060c \u0648\u0645\u0631\u0627\u0642\u0628\u0629 \u062c\u0648\u062f\u0629 \u0627\u0644\u062a\u0635\u0646\u064a\u0639 \u0637\u0648\u0627\u0644 \u0627\u0644\u0639\u0645\u0644\u064a\u0629\u060c \u0648\u0642\u064a\u0627\u0633 \u0627\u0644\u0645\u0646\u062a\u062c \u0627\u0644\u0646\u0647\u0627\u0626\u064a \u0628\u062f\u0642\u0629 \u0639\u0627\u0644\u064a\u0629\u060c \u0648\u0627\u0644\u062a\u062d\u0642\u0642 \u0641\u064a \u0627\u0644\u0645\u0635\u0646\u0639\u060c \u0648\u0627\u0644\u0645\u0639\u0627\u064a\u0631\u0629 \u0627\u0644\u062f\u0648\u0631\u064a\u0629 \u0623\u062b\u0646\u0627\u0621 \u0627\u0644\u062e\u062f\u0645\u0629\u060c \u0648\u0645\u0631\u0627\u0642\u0628\u0629 \u062c\u0648\u062f\u0629 \u0627\u0644\u0627\u0633\u062a\u062e\u062f\u0627\u0645\/\u0627\u0644\u0635\u064a\u0627\u0646\u0629...<\/p>","protected":false},"author":1,"featured_media":3067,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","_seopress_robots_follow":"","_seopress_robots_imageindex":"","_seopress_robots_snippet":"","_seopress_robots_primary_cat":"","_seopress_robots_breadcrumbs":"","_seopress_robots_freeze_modified_date":"","_seopress_robots_custom_modified_date":"","_seopress_robots_canonical":"","_seopress_social_fb_title":"","_seopress_social_fb_desc":"","_seopress_social_fb_img":"","_seopress_social_fb_img_attachment_id":0,"_seopress_social_fb_img_width":0,"_seopress_social_fb_img_height":0,"_seopress_social_twitter_title":"","_seopress_social_twitter_desc":"","_seopress_social_twitter_img":"","_seopress_social_twitter_img_attachment_id":0,"_seopress_social_twitter_img_width":0,"_seopress_social_twitter_img_height":0,"_seopress_redirections_value":"","_seopress_redirections_enabled":"","_seopress_redirections_enabled_regex":"","_seopress_redirections_logged_status":"","_seopress_redirections_param":"","_seopress_redirections_type":0,"_seopress_analysis_target_kw":"","_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_kadence_starter_templates_imported_post":false,"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"categories":[35],"tags":[],"class_list":["post-3066","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"taxonomy_info":{"category":[{"value":35,"label":"NEWS"}]},"featured_image_src_large":["https:\/\/jtlcnc.com\/wp-content\/uploads\/2026\/07\/123.png",500,375,false],"author_info":{"display_name":"jinxing6611@gmail.com","author_link":"https:\/\/jtlcnc.com\/ar\/author\/jtlcnc\/"},"comment_info":0,"category_info":[{"term_id":35,"name":"NEWS","slug":"news","term_group":0,"term_taxonomy_id":35,"taxonomy":"category","description":"","parent":0,"count":364,"filter":"raw","cat_ID":35,"category_count":364,"category_description":"","cat_name":"NEWS","category_nicename":"news","category_parent":0}],"tag_info":false,"_links":{"self":[{"href":"https:\/\/jtlcnc.com\/ar\/wp-json\/wp\/v2\/posts\/3066","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jtlcnc.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jtlcnc.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jtlcnc.com\/ar\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jtlcnc.com\/ar\/wp-json\/wp\/v2\/comments?post=3066"}],"version-history":[{"count":1,"href":"https:\/\/jtlcnc.com\/ar\/wp-json\/wp\/v2\/posts\/3066\/revisions"}],"predecessor-version":[{"id":3068,"href":"https:\/\/jtlcnc.com\/ar\/wp-json\/wp\/v2\/posts\/3066\/revisions\/3068"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/jtlcnc.com\/ar\/wp-json\/wp\/v2\/media\/3067"}],"wp:attachment":[{"href":"https:\/\/jtlcnc.com\/ar\/wp-json\/wp\/v2\/media?parent=3066"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jtlcnc.com\/ar\/wp-json\/wp\/v2\/categories?post=3066"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jtlcnc.com\/ar\/wp-json\/wp\/v2\/tags?post=3066"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 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(I) Core Indicator Tolerance Grading (GB\/T4987, 20\u00b0C Standard Temperature)
Flatness Tolerance Formula: (T=K\u00d7(1 d\/1000) \\ \\mu m), where d is the platform diagonal in mm.<\/p>\n\n\n\nTolerance Grade<\/th> Coefficient K<\/th> 1000mm Diagonal Flatness<\/th> \u0633\u064a\u0646\u0627\u0631\u064a\u0648 \u0627\u0644\u062a\u0637\u0628\u064a\u0642<\/th><\/tr><\/thead> 000 Grade<\/td> 1<\/td> \u22482\u03bcm<\/td> Optical metrology, laser interferometry reference, semiconductors<\/td><\/tr> 00 Grade<\/td> 2<\/td> \u22483\u03bcm<\/td> CMM laboratory, metrology calibration room<\/td><\/tr> 0 Grade<\/td> 4<\/td> \u22486\u03bcm<\/td> Precision molds, aerospace component inspection<\/td><\/tr> 1 Grade<\/td> 8<\/td> \u224812\u03bcm<\/td> Machining workshop routine inspection<\/td><\/tr> 2 Grade<\/td> 16<\/td> \u224824\u03bcm<\/td> Ordinary marking, assembly positioning<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n \n
Tools: Grade 0 granite straightedge, digital dial indicator with 0.1\u03bcm resolution, bridge plate;
Layout: Four sides two diagonals segmented measurement;
Judgment: The maximum gap represents the local flatness error, suitable for workshop initial inspection.<\/li>\n\n\n\n
Equipment: 0.001mm\/m high-precision electronic level, standard bridge plate;
Layout: Cross shape (diagonals central cross) or full 5\u00d75 grid coverage;
Bridge plate end-to-end overlapping segmented scanning, recording tilt angle readings;
Least squares method fitting to ideal reference plane, calculating global flatness error;
Simultaneously outputting surface waviness (local micro-undulations directly affecting workpiece measurement repeatability) xian.shand\u2026<\/li>\n\n\n\n
Optical reference non-contact measurement, eliminating bridge plate self-weight bending error, suitable for large Grade 00 platforms over 2m, continuous segmented collection of tilt data, computer-fitted plane.<\/li>\n\n\n\n
Using laser wavelength as the length reference, interference fringes directly converted to height difference, measurement accuracy up to 0.1\u03bcm, used for traceability verification of the highest-level platforms in metrology institutes.<\/li>\n<\/ol>\n\n\n\n
Perpendicularity: Grade 00 granite square dial indicator, measuring the perpendicularity of the side to the working surface, tolerance \u2264 Grade 12 (GB\/T1184);
Parallelism: Standard reference platform stacking and dial reading, height difference between top and bottom working surfaces;
Surface Roughness: Surface roughness tester, working surface Ra \u2264 0.63\u03bcm;
Coloring and Lapping Inspection (Auxiliary verification): Uniformly apply red lead powder to a standard straightedge, \u226525 lapping spots within a 25\u00d725mm square represent microscopic plane uniformity without local depressions or pits Zhenjiang Thailand\u2026
(IV) Essential Pre-measurement Conditions (To avoid measurement distortion)
Platform constant temperature rest for 24h, completely consistent with ambient temperature;
Working surface free of dust, oil stains, iron filings, and water stains;
Level and bridge plate pre-tempered to constant temperature, eliminating temperature difference of measuring instruments;
Measurement area free of fans, direct sunlight, and machine tool vibrations.<\/p>\n\n\n\n
Full Outgoing Inspection Checklist
Appearance defects (no cracks, sand holes, scratches) \u2192 Dimensional tolerance \u2192 Flatness \u2192 Planarity fluctuation \u2192 Perpendicularity \u2192 Parallelism \u2192 Roughness \u2192 Load deflection test;
Qualification Criteria
All indicators must simultaneously meet the corresponding grade tolerances; any single indicator exceeding the tolerance must be reworked and precision-ground; downgrading and releasing the product is strictly prohibited;
Traceability Certificate
Issue a CNAS traceable verification report, marking the testing environment, instrument model, original flatness data, error distribution chart, and accuracy grade, to be delivered with the platform.
V. In-service Quality Control (Long-term Precision Maintenance)<\/p>\n\n\n\n\n
Class 000\/00 Metrology Lab: Calibrate every 3\u20136 months;
Class 0 Precision Inspection Room: Calibrate annually;
Class 1 Machining Workshop: Calibrate every 1\u20132 years;
Class 2 General Workstation: Calibrate every 2\u20133 years;
Heavy-duty, impact, or oil-contaminated harsh environments shorten the cycle by half hxrtools.c\u2026<\/li>\n\n\n\n
Daily Cleaning: Wipe with waterless alcohol lint-free cloth; wire brushes and hard tools are prohibited for scraping;
Weekly Visual Inspection: Check for bumps, chipped corners, cracks, and obvious scratches;
Monthly Simple Verification: Color-coat standard gauge blocks for lapping to judge if local planarity has deteriorated.<\/li>\n\n\n\n
Keep away from heat sources, welding machines, machine tool vibrations, and direct sunlight from doors and windows;
Equip with three-point vibration-isolating supports; direct placement on the ground is prohibited;
Overloading, single-point heavy impact, and dragging workpieces across the surface are prohibited;
For long-term idle storage, flip the platform every 3 months to offset gravity-induced creep deformation.
VI. Common Quality Defects and Rectification Solutions
\u0627\u0644\u062c\u062f\u0648\u0644
Defect Phenomenon | Root Cause | Quality Control Rectification Measures
Flatness out of tolerance, middle bulging \/ corners lifting | Insufficient aging, large temperature difference during grinding, unreasonable support | Re-perform constant-temperature aging, comprehensive secondary precision grinding, adjust three-point support
Localized dense scratches | Machining dust, workpiece dragging | Polish to repair, standardize the use of protective pads
Sparse lapping spots, local high points | Grinding abrasive particle size jumps, uneven polishing | Gradual fine grinding uniform polishing, local correction via laser interferometry
Slow deformation during long-term use | High water absorption of stone, drastic temperature and humidity fluctuations | Replace with low-absorption stone, install constant-temperature covers at workstations
Perpendicularity out of tolerance | Side machining grinding vibration | Fine grinding of the side, section-by-section correction with a square ruler
VII. Summary: Complete Quality Control Closed-Loop Logic
Raw material screening \u2192 Natural aging for stress relief \u2192 Constant-temperature anti-vibration graded grinding \u2192 Multi-method high-precision measurement of finished products \u2192 Factory verification and traceability \u2192 In-service cycle calibration daily maintenance
The entire system revolves around the core characteristics of granite\u2014low expansion, high stability, and non-magnetic. Through environmental temperature control, stress elimination, micron-level optical measurement, and periodic calibration, it ensures the platform maintains its reference plane precision over the long term, meeting the traceability requirements of precision manufacturing and metrological testing.<\/li>\n<\/ol>\n\n\n\n![\"\"](\"https:\/\/jtlcnc.com\/wp-content\/uploads\/2026\/07\/123.png\")
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