铸铁平板平台接触点面积比率的检验
时间：2016/1/25 10:11:40
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将被测铸铁平板平台工作面涂上显示剂，用不低于其精度等级的平板研合，研合后的被测铸铁平板平台工作面显示出明显的接触点。然后用一在50mm×50mm范围内刻有2.5mm×2.5mm的400个方格的透明薄板（例如有机玻璃），置于被测铸铁平板工作面的任意位置上，依次观察每个方格内包容接触点所占面积的份数（以1/10为单位）。求上述份数之和除以4，即为所测试部分的接触点面积的比率。为取得典型的数值，应在另一位置上测出接触点面积的比率，求出两次结果的平均值。
铸铁平板平台技术要求
1、平板工作面不得有严重影响外观和使用性能的砂孔、气孔、裂纹、夹渣、缩松、划痕、碰伤、绣点等缺陷。
2、平板的铸造表面应清楚型砂且平整，涂漆牢固。
3、精度等级为0级~3级的平板工作面上，直径小于15mm的砂孔允许用相同材料堵塞，其硬度应小于周围材料的硬度。工作面堵塞的砂孔应不多于4个，且砂孔之间的距离应不小于80mm。
4、平板应采用优质细密的灰口铸铁等材料制造，其工作面硬度应为170~220HB。
5、平板工作面通常采用刮削工艺。对采用刮削加工的3级平板工作面，其表面粗糙度Ra最大允许值为5μm。
6、平板应去磁和稳定性处理。
7、平板相对两个侧面上，应有安装手柄或吊环装置的螺纹孔（或圆柱孔），且装置位置的设计应尽量减少因搬运而引起的变形。
8、若平板工作面上设置螺纹孔（或沟槽），其部位应不高于工作面。
Inspection of contact area ratio of cast
iron flat platform
The working surface of the cast iron flat
plate platform to be tested is coated with a display agent, and the flat
surface of the cast iron flat plate platform after the joint test shows a clear
contact point. Then, using a 400 square transparent sheet (for example,
plexiglass) engraved with 2.5 mm × 2.5 mm in a range of 50 mm × 50 mm, placed
on any position of the cast iron plate working surface, and sequentially
observed in each square. The number of copies of the area occupied by the
contact points (in units of 1/10). The sum of the above parts is divided by 4,
which is the ratio of the contact area ofthe tested portion.
To obtain a typical value, the ratio of the area ofthe contact point should be measured at another location to find the
average of the two results.
Cast iron flat platform technical
requirements
1. The flat working surface shall not have
defects such as sand holes, pores, cracks, slag inclusions, shrinkage,
scratches, bumps, and embroidered points that seriously affect the appearance
and performance.
2. The casting surface of the flat plate
should be clear and smooth, and the paint should be firm.
3. On the flat working surface with the
accuracy grade of 0 to 3, the sand hole with diameter less than 15mm is allowed
to be blocked with the same material, and its hardness should be less than the
hardness of the surrounding material. There should be no more than 4 sand holes
in the working face, and the distance between the sand holes should be no less
than 80mm.
4, the plate should be made of high-quality
fine gray cast iron and other materials, the working surface hardness should be
170 ~ 220HB.
5, the flat working surface usually uses
the scraping process. For the 3-stage flat working surface using the scraping
process, the maximum allowable surface roughness Ra is 5 μm.
6, the plate should be demagnetized and
stable.
7. On the opposite sides of the flat plate,
there should be a threaded hole (or cylindrical hole) for mounting the handle
or the lifting device, and the position of the device should be designed to
minimize the deformation caused by the handling.
8. If a threaded hole (or groove) is
provided on the working surface of the plate, its position should not be higher
than the working surface.
Company name: botou zhuoyuan mechanical equipment manufacturing co.,LTD
Registered
address: jiaohe development zone, botou city, hebei province
Fax
number: 0317-8031093
Contact
information: 15369812793 (WeChat with the same number) liansheng chu
Postcode:
062151
Enterprise
email:1358827475@qq.com
Account
Opening Bank: Botou Branch of Bank of China
Account
number: 100399943203
Agricultural
bank account number: 6228481739059615270
http://zhuoyuanjixie.com