Experience Determination Method of Reamer Diameter Tolerance
In mechanical manufacturing, it is common to determine the reamer diameter tolerance based on the dimensional accuracy of the hole being machined. The diameter tolerance of the reamer has a direct effect on the dimensional accuracy of the hole being machined, the manufacturing cost of the reamer, and the service life of the reamer. To this end, we based on practical experience. Summarized the reamer diameter tolerance determination method, as described below. Assume that the upper and lower deviations of the hole of the part being machined are ES and EI, respectively, while the upper and lower deviations of the diameter of the reamer are es and ei, respectively. Then: es = 2 (ES-EI) + EI 3 ei = es- 1 (ES-EI) 4 For example: We need to ream the hole of Ø10H9 (0 + 0.036), the upper deviation of the dumpling knife according to the above formula should be: es = 2 (0.036-0)+0=0.024 The lower deflection of the reamer according to the above formula shall be: ei=0.024- 1 (0.036-0)=0.015 Then the reamer Ø10H9 (0+0.036) hole reamer dimensions and tolerances The band is Ø10+0.015+0.024. Check the data, Ø10H9 reamer size tolerance of Ø10 +0.013 +0.023 and calculated tolerances are very small, can meet the requirements. The method can provide a reference for designing or grinding the reamer according to the dimensional accuracy of the hole being machined. However, the reaming is also affected by factors such as radial runout of the spindle of the machine tool, misalignment of the reamer, radial runout of the reamers of each tine, cooling fluid, cutting amount, and the like, so that the diameter of the hinged hole tends to expand or contract. Therefore, in order to meet the process requirements, it is generally necessary to first test the hinge, correct the calculated tolerance band according to the condition of the test hinge, and then sharpen the reamer and put it into use.
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