Cast iron plate purposes: flat can be used to measure the reference test mechanical parts flatness, parallelism, straightness tolerance and other forms can also be used for precision parts of the line and measurement, laboratory, welding, soldering, base, table, etc. . It is also divided into measured according to the use of cast iron flat iron plate, cast iron plate test, crossed iron plate, welded iron plate, cast iron table, a large cast iron plate, and so on. Cast iron plate packaging: iron packaging and wood packaging in two forms, the platform surface with plastic film packaging, the packaging is suitable for flat inland transportation, and good moisture, shock, rust and rough handling protection plate measures to ensure the safety of arriving at the scene. Cast iron plate of Transportation: Transportation is an important part of the plate to ensure that no deformation, so the transport plate to ensure that no overload, no speed, no driver fatigue, not the harsh weather conditions of transport. Note the use of cast iron plates: When first installation and commissioning. Then, wipe clean the face plate, used in the case confirmed that no problem using the process, to avoid the workpiece and the face plate has a radical impact, prevent damage face plate; workpiece weight but can not over flat rated load, which will cause lower quality of work, there may be damage to the flat structure, or even cause flat deformation, so that the damage can not be used. When using the tablet first installation and commissioning. Then, wipe clean the face plate, used in the case confirmed that no problem using the process, to avoid the workpiece and the face plate has a radical impact, prevent damage face plate; workpiece weight but can not over flat rated load, which will cause lower quality of work, there may be damage to the flat structure, or even cause flat deformation, so that the damage can not be used. Cast iron plate manufacturing standards: the platform according to the national GB7947-1999 standards. Accuracy levels have 0,1,2,3, level and fine plane, the platform is made of plate and box-style ribs, face a rectangular, square or round. Face using scraping process, the working surface can be processed V-shaped, T-shaped, U-shaped grooves and holes, long holes and so on. Cast iron plate quality testing: 1, the working surface should not have rust, appearance defects scratches, bumps and other effects used. 2, the working surface should not have sand holes, pores, cracks, slag and shrinkage and other casting defects. Various casting surface should be cleared of sand, and a smooth surface, painted solid. Each edge shall be rounded obtuse. Accuracy level is below the flat work surface "00" level, the hole diameter less than 15mm of sand allows the same plugging material, its hardness should be lower than the hardness of the surrounding material. The site of blockage in the work surface should be no more than four, the distance between them, shall be not less than 80mm. 3, the opposite on both sides, should be provided with threaded holes or cylindrical hole mounting handles, lifting rings and other facilities. Design lifting position should be considered to minimize variation caused due to lifting. 4, according to user requirements, in the work surface plate screw holes or grooves, these areas should not be higher than face the phenomenon of projection. 5, should be of gray cast iron or cast iron alloy fine particles of high-quality materials. 6, face hardness should HB 170-220. 7. Face scraping process should be used for the "3" level flat working surface can also be used planing process, the surface roughness of the surface planing work according to the outline of an arithmetic mean deviation Ra value should be less than 5um 8, should be subject to the stability of the processing and demagnetization. Cast iron plate grinding: the platform at a very early time, people use three platforms are matched to produce a true horizontal plane. A skilled master grindstone and have patience without the aid of any measuring instruments, but only matched using a three-way platform, do rotating multiple of 90 degrees, can produce truly incredible degree level. Cast iron plate flatness: divided into laboratory grade (Reference), calibration level (Master), tool room level (Working) three 1.AA level: its flatness (μm) = 1 + 1.6D2 (D platform for diagonal length or diameter) for the high degree of precision measurement purposes, commonly used in laboratories. 2. A level: its flatness is twice the AA level of error, commonly used in laboratory tool for testing the use of precision measuring tools. Level 3. B: its flatness AA level of the four-fold error, commonly used in the laboratory or in the field tool inspection gage or crossed purposes. Cast iron plate in accordance with zoning: cast iron platform can be divided into: base plate, crossed plate, inspection plate, welding plate, welded plate, Pyrotechnics flat fitter plate, grinding plate, scraping the plate, pressure sand flat, test plate, machine tool Workbench (such as: floor boring machine table), coordinate flat, mold plate, assembled plate (also called mounting plate). Or: basic platform, crossed platforms, testing platforms, welding platform, welding platform, Pyrotechnics platform, fitter platform, grinding platform, scraping platform, pressure sand platform, test bench (such as: vibration test bench for short vibration test stand ), the machine table (such as: floor boring machine table), coordinate platform, mold table, assembly platforms (also known as assembly platform). According to shape classification: ordinary flat (common platform), circular plates (also called round flat / round platform / circular platform), side plate (side platforms) according to the surface process can be divided into: flat plate and T-slot plate (T -slot platform) positioning of the workpiece 1 is completely full six degrees of freedom is restricted position, called perfectly positioned. When the workpiece x, y, z coordinate directions on both the size requirements or location accuracy requirements, generally use this positioning. 2 not fully positioned according to processing requirements, it does not need to limit the freedom of all the work, such positioning called incomplete positioning. For example, in lathe axis of the through hole, according to the processing requirements, without limitation x / and x / two degrees of freedom, so with jaw self-centering chuck holding limit remaining four degrees of freedom, to achieve four-point positioning. For example, cast iron plate or iron platform, cast iron table, a large cast iron platform measuring flat ground plane on the workpiece surface grinder, only the thickness of the workpiece and parallel requirement, so just limit x / y / z / three degrees of freedom, electromagnetic bench grinder can be realized on a three-point positioning. 3 due to positioning by step processing requirements, positioning of the workpiece should limit the freedom of all restrictions have not been called due to positioning. Location can not be guaranteed due to processing requirements, it is absolutely not allowed. Such as car stepped shaft, to ensure the size of the x-axis direction L. stepped shaft But after positioning grinds x-axis direction positioning element is not set, will make the workpiece clamping position along the x-axis direction uncertain, it would be a number of workpiece clamping position after inconsistent, L size can not guarantee that occurs due to positioning. 4 through the positioning of the workpiece positioning, the same two or more degrees of freedom is the anchor of the workpiece positioning repeat restrictions, known as over positioning. Under normal circumstances, Guo positioning may cause the workpiece can not be installed, generating interference or positioning of the workpiece clamping or positioning element after deformation.