Cast iron platform included

Material: cast iron plate using HT200-300 casting, material ingredients ingredients and ingredients according to the following criteria (%): carbon: 3.1-3.4, manganese: 0.6-0.9, silicon: 1.5-2.0, sulfur <0.12, phosphorus < 0.3. Hardness> 180, the second tempering treatment.

Cast iron platform Use of the environment:

1.1 Ambient temperature: -545

1.2 Relative humidity: 95%

2, the main technical parameters and requirements:

2.1 cast iron platform cast iron grade HT200

2.2 Surface hardness HB = 170-220

2.3 Tensile strength 260N / square meter

2.4 on the platform processing finish: higher than 3.2

2.5 work platform flatness error and straightness error must meet the requirements of customers or drawings

3.1 In the casting process, strictly control the composition of the five elements of casting content, requiring no cracks in the table, ash. Surface defects according to national standards.

3.2 in the casting process must ensure that the two tempering treatment.

The first: in the casting blank after tempering qualified to eliminate cast casting to destroy the equilibrium state of stress.

The second: rough roughing in the rough after the completion of aging to eliminate machining damage caused by the balance of casting stress.

3.3 platform geometry, finished weight, dimensional accuracy and shape and position tolerance and other technical indicators, in strict accordance with the drawings or technical requirements.

3.4 working platform to do anti-rust brushing the surface of the process, the other surface brush primer twice, the exposed surface and then brush anti-rust oil twice.

Cast iron platform technical requirements:

1, the platform must be twice after the stress stress aging treatment to prevent the deformation of the stress memory distortion and the future use of the platform in the occurrence of cracks in the phenomenon of elimination of casting stress, roughing the purpose of stress, stress relief of more than 90%

2, the face of processing at the end of sharp angle;

3, the casting surface to be processed without external force, polished, the inner surface are required to paint anti-rust paint;

4, flat face can not seriously affect the appearance and performance of sand holes, pores, cracks, slag, shrinkage, scratches, bumps, rust and other defects.

3, the accuracy grade 0 ~ 3 flat working surface, the diameter of less than 15mm of sand holes allow the same material blockage, the hardness should be less than the hardness of the same material.Faceface blocked sand holes should not be more than 4 And the distance between the sand holes should not be less than 80mm.

4, the plate should be high-quality fine gray cast iron or alloy cast iron and other materials, the face hardness should be 170 ~ 220HB.

5, the flat face is usually applied to use scraping process.For scraping the three-stage flat working face, the surface roughness Ra of the maximum allowable value of 5чm.

7, the flat face with the scraping process should be carried out on the color of the test. The proportion of contact area after the inquiry shown in Table 3, or 25mm × 25mm in the number of points of contact should not be greater than 5 points Controversial, according to the ratio of contact area for the assessment basis.

8, the plate relative to the two sides, should be installed handle or ring device screw hole (or cylindrical hole), and the device location should be designed to minimize the deformation caused by handling.

9, if the flat working surface set screw hole (or groove), the site should not be higher than the face.

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2. About size GB standard gauges I have a spot with the director, received orders, 72 hours of delivery; non-standard measuring tool can be customized, the production period is short, please rest assured purchase.

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