一、内容概述Overview
试验铁地板base Plate
附件Accessories：空气弹簧隔振系统Air springs vibration isolation system.
二、技术资料Technical information：
铸件标准Castin standard JB/T7974-1999；
时效处理Aging treatment GB/T9439-2010；
T型槽执行标准T-slot standard JB/T158-1996；
未注线性公差标准Undeclared leaner tolerance standard GB/T1804-2000；
铸件鉴定Casting identification GB4986-85；
三、技术要求及有关说明Technical requirements and attentions：
T型槽尺寸DIN28，间距为250mm均匀分布；
T-slot standard according to DIN28,distance between T-slots is 250 mm;
铸铁平板精度等级为三级（整体外观质量），材料为：HT250，时效处理HT250执行GB/T9439-2010标准；
Casting iron plate accuracy is Grade 3,material is HT250, Aging treatment for HT250 according to standard GB/T9439-2010
铸件表面不得有裂纹、砂眼、气孔、缩松等铸造缺陷以及毛刺、浇帽口和氧化皮等工艺缺陷，不得有影响铸件使用性能的冷隔、加渣、穿透性气孔等缺陷；
Following defects are not acceptable :casting defects such as crack,sand hole,air blister,shrinkage,etc;technology defects such as burr,casting head,scale,etc;defects which affect the normal use such as cold shut,production of dross,penetrating pore,etc.
平板的制造分铸造、粗加工、精加工三大阶段，整个过程进行两次回火处理，第一次在铸件毛坯形成后，第二次在粗加工完毕后。铸造后进行充分时效处理，消除内应力，技术斜度2°30′；
There are three steps which are casting,rough machining,finish machining for making clamping plate.Two times tempering should be done in the whole manufacturing process,the first time is after rough casting,the second time is after rough machining.Enough
aging treatment and relieving of internal stress should be done after casting,technical slope 2°30′.
铁地板工作平面的平面度（单位，对角线）：≤0.25mm，工作平面的粗糙度为3.2μm，底部安装空气弹簧平面粗糙为＜6.3μm，T型槽的平行度公差≤0.3mm；
Flatness of working surface(unit,catercorner): ≤0.25mm
Roughness of working surface: 3.2μm
Roughness of surface for air spring installation: ＜6.3μm
T-slot parallelism tolerance: ＜6.3μm
除上述要求外，铸件按标准
JB/T7974-1999铸造平板生产，国标GB4986-85进行鉴定；尺寸和公差按双方的图纸要求。如上述标准被替代按相应标准进行，未注线性公差按
GB/T1804-2000按m级规定执行；
In addition to above requirements,the casting manufacturing is according to standard JB/T7974-1999,authentication is according to national standard GB4986-85,dimension and tolerance is according to the requirements in the drawings.Refer the relevant standard if any of above standards is replaced, undeclared leaner tolerance is according to GB/T1804-2000,grade m.
平板非工作面涂防锈底漆，面漆为蓝色，工作表面涂防锈油；
Plate non-working surface should be coated by rust inhibiting primer,finishing coat in blue,working surface should be coated by rust preventive oil.
平板安装采用弹簧阻尼隔震系统；
The clamping plate is installed on air springs vibration isolation system.
铁地板的整体结构必须满足设备250KN的静态载荷和180kN的动态载荷的要求。
