北重划线平台HT200-300生产工艺
划线平台/铸铁平台按GB/4986-85标准制造，划线平台制成筋板式和箱体式，工作面有长方形，材料HT200,工作面采用刮研工艺，工作面上可加工V型、T型、U型槽和圆孔、长孔等。铸铁平板是用于工件检测或划线的平面基准器具。平板安装应调至水平、负荷均分布于各支点上，环境温度使用时应避免振划线平板(平台)的用途： 是检查机器零件平面度，直线度等形位公差的测量基准，也可用于零件划线研磨加工，安装设备等用途。是检验机械零件平面、平行度、直线度等形位公差的测量基准，也可用于一般零件及精密零件的划线、铆焊研磨工艺加工及测量等。
Making Out Surface Plate can be made into the rib type or box type, and its wo**ng surface could be rectangle, square or round. Additionally, the wo**ng surface are allowed to h**e V or U-shaped grooves, round holes, slot holes. Etc. A surface plate is a solid, flat plate used as the main horizontal reference plane for precision inspection, ma**ng out (layout), and tooling setup. The surface plate is often used as the baseline for all measurements to the workpiece.
划线平台的生产工艺流程基本是：
Technological process of production of Making Out Surface Plate:
一、铸铁平板毛坯：按技术要求制图纸、按图纸制作模型、配料、造型、烘干、浇铸、落沙、清理、检验毛坯的各部位；热处理毛坯，时效处理，其目的是降低铸件内部的应力，防止机械加工后的变形。
铸铁平板机械加工：外观检验并划线、加工、检验；
三、铸铁平板工件调平、人工刮研、检验科检验； 四、铸铁平板的外观处理、喷漆、包装、入库。 铸铁平板的精度也可以说是铸铁平板的平面度：铸铁平板一般精度可以分为0级、1级、2级、3级。铸铁平板的精度标准在《**机械行业标准》JB/T 7974&**sh;2000里可以查到。选用精度标准时一般根据使用情况酌情而定。3级精度以上的铸铁平板用做检验、划线、装配等使用，4级精度以下的铸铁平板一般用做铆焊等使用。
1. Rough casting:
Make drawings according to the technical requirements-Making mold as per the drawings-Prepare material-Modelling-Filling sand-drying-casting-Surface cleaning -Casting parts testing.
2. Heat treating and aging treatment, to reduce the internal stress of castings and to prevent it from deform after **hining.
3. Rough **hining:
Visual Inspection-Ma**ng-**hining -Final inspection and test.
4. Precision finishing:
Leveling -Scraping- Inspection and testing.
5. Final finish:
Painting,-packing -deliver to ware**.
The accuracy of the Cast Iron Surface Plate refers to the deviation from flatness of the wo**ng surface and it shall be classified as Grade 0,1,2,3.