Complete Acceptance Standards for 00/000 Grade High-Precision Granite Surface Plates I. Basis of Execution II. Part One: Raw Material Acceptance (Mandatory inspection upon arrival, determining long-term deformation resistance) 1. Hard Requirements for Stone Types Only Jinan Qinghui Longyan / Indian Black Fine-grained Granite are permitted; dyed stones, stratified miscellaneous stones, and porous ordinary marble are…
Complete Processing Workflow for # 00/000 Grade High-Precision Granite Plate Adhering to the national standard GB/T 20428 “Granite Flat Plates”, the entire precision machining process must be completed in a dust-free, vibration-dampened workshop at a constant temperature of 20±0.5℃. The core process is divided into nine major stages: Raw Material Screening → Rough Cutting →…
The Impact of Granite Platform Processing Technology on Accuracy and StabilityThe initial flatness of a granite platform at the time of delivery is determined by the grinding process, while its long-term stability is determined by the full-process stress control. No matter how good the raw material is, if the processing technology is unreasonable, it may…
How to determine whether the raw materials for granite platforms meet the requirementsThe later-stage deformation and precision deviation of granite platforms often stem from defects in the stone billets. The judgment of raw materials is divided into document verification, visual inspection, simple on-site screening, laboratory testing, and ultrasonic flaw detection to check for internal defects,…
How to select high-precision granite platforms with long-term stability The long-term precision drift and warping deformation of granite platforms are mostly not caused by insufficient grinding precision, but by the loss of control in five major stages: raw material selection, stress aging, structural design, processing technology, and acceptance inspection. To achieve long-term stability, one cannot…
Complete Purchasing Guide for Precision Granite Measuring Tools (Industry Alias: Marble Measuring Tools)The industry term “marble measuring tools” actually refers entirely to natural gabbro granite; cast iron and ordinary marble cannot meet the requirements of micron-level precision inspection. Selection is divided into 7 core dimensions: matching material, precision, size, thickness, process, certification, and accessories according…
Data Monitoring and Analysis Report on Granite Bases for Chinese CMMs I. Monitoring Objects and Basic Conditions II. Comparative Analysis of Temperature Deformation Monitoring Data (Core Error Sources) Material Maximum surface temperature difference Total expansion per meter ΔL 48h measurement repeatability drift Jinan Qing Granite ≤1.8℃ ≤0.006mm/m 0.6~0.8μm HT250 Cast Iron 7.5~8.2℃ 0.014mm/m 2.1~2.5μm Data…
Analysis of the Six Core Advantages of Using Granite for High-Precision Machine BasesI. Extremely Low Thermal Expansion Coefficient, Zero Precision Drift in Constant Temperature Conditions (Core Advantage)The linear expansion coefficient of high-density Jinan blue granite is only 4.5~6×10⁻⁶/℃, about half that of cast iron (11~13×10⁻⁶/℃), and its thermal diffusion speed is much slower than metals,…
Granite vs. Cast Iron Base — Comprehensive Vibration Control ComparisonI. Core Vibration-Related Material ParametersTablePerformance Indicator Natural Granite (Jinan Green / Black Granite) Gray Cast Iron HT250/HT300 Impact on Vibration ReductionDamping Coefficient (Core of Vibration Reduction) 0.06–0.12 0.02–0.03 Granite damping is 3–4 times that of cast iron, vibration decay is much fasterElastic Modulus Approx. 50GPa 100–140GPa…
Full-field Applications of Granite Machine Tool Bases (Granite Bases)Relying on six core characteristics—low linear expansion, strong vibration absorption, non-magnetic, rust-proof, zero internal stress, and high flatness—granite machine tool bases are exclusively used for micron/nanometer-level high-precision equipment. They are not suitable for general machine tools subject to heavy cutting impacts. They are divided into six major…
