The material selected for the cast iron platform plate charge is the choice of pig iron according to GB718-82. The technical conditions and inspection of the cast iron platform: According to the type of cast iron platform, there are different technical requirements for gray iron castings, malleable iron castings and ductile iron. In general, gray iron castings are carried out in accordance with GB976-67. Pig iron for ductile iron is selected according to GB1412-78. Standards are divided into groups, classes, and grades by chemical composition of pig iron, but carbon content is not considered. Inspection can be carried out according to GB1348-88. The shape size and quality deviation shall comply with the drawings or comply with the provisions of GB6414-1999. The grade, processing allowance and dimensional deviation of the platform shall comply with the provisions of the drawings or comply with the provisions of GB6414-1999.
1. The deflection of the cast iron platform is placed on the working surface of the tested platform. When the load is not applied, the torsion spring comparator head is in contact with the working surface (for accurate measurement, a piece can be placed between the probe and the working surface) Thin gauge) and note the reading. Then apply the force according to the rated load specified in Table 5 and record the reading; the difference between the two readings is the deflection value of the working surface of the tested plate under the rated load.
2. The ratio of the contact area of ​​the cast iron platform will be coated with the display agent on the inclined surface of the platform, and will be grounded on the platform board not lower than its accuracy level, showing obvious contact points on the tested platform, and then using a 400 small square transparent sheets (such as plexiglass sheets) with 2.5MM×2.5MM are engraved in the range of 50MM×50MM. Place it at any position on the working surface of the platform to be inspected, and then observe the proportion of the area occupied by the contact points in each square (in units of 1/10). The sum of the above ratios is calculated, and dividing by 4 is the ratio of the contact area of ​​the detected portion. To get a typical value. The ratio of the area of ​​the contact point should be measured at another location to find the average of the two results.
3. Plane fluctuation of cast iron platform Place the plane wave instrument on the working surface of the platform and move the plane wave instrument along any straight line direction. The moving distance is half of the diagonal length of the platform and should not be less than 200MM. Take the difference between the most value and the minimum value on the indicator table of the plane wave meter (index value is 0.001MM). That is, the amount of plane fluctuation of the working surface of the platform to be inspected.
Auto Lock Steel Measuring Tape
Auto Lock Steel Measuring Tape
The telescopic tape can reliably and automatically lock and return the button without twisting to extend the distance, and it can be immediately drawn into a small shell.
It is suitable for kitchens, garages, manufacturing factories, steel factories, hardware stores, etc. it can be used to measure the length and width of measuring tools or casting aircraft, machines, furniture, etc., and it can be used to measure the accurate large tape.
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