T -shaped grooves are mainly verified items A. Material and surface hardness.B. The shape of the shape is tolerance, including nominal size, vertical tolerance.C. Appearance.D. Plane degree.E. Contact spots.F. Plane volatility.G. The working surface allows deflection values.H, surface roughness.
Appraisal method of T -type slot platform
1. There should be no rust, scratches, bumps, and other influential appearance defects on the working surface of the T -shaped slot platform.
2. There should be no cast defects such as sand holes, pores, cracks, residues, and shrinkage on the working surface of the T -shaped slot tablet.The surface of each casting should be thoroughly removed, and the surface is flat and painted firmly. The tax edges should be blunt.
3. On the relative sides of the tablet, the T -shaped slot should be set up, threaded holes or cylindrical holes in the installation handle or hanging position.When setting the lifting position, consider minimizing deformation caused by hanging.
4. The T -shaped slot tablet should be treated and removed by stability.
5. The T -shaped slot tablet working surface and side and the vertical tolerance on both sides are 12 levels (according to the GB1184-80 "shape position tolerance").
6. The hardness of the T -shaped slot tablet should be between HB170-220 or 187-255.
7. The main test items of the T -shaped grooves A, material and surface hardness.B. The shape of the shape is tolerance, including nominal size, vertical tolerance.C. Appearance.D. Plane degree.E. Contact spots.F. Plane volatility.G. The working surface allows deflection values.H, surface roughness.
8. Accuracy parameters.Level 3 tablets do not specify the requirements for contact with spots.Class 1 tablets require the number of contacts in the contact spots at any 25 × 25mm plane at no less than 20 points.Class 2 tablets require the number of contacts to contact spots at no less than 12 points in any 25 × 25mm plane.

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