Because the production technology of some companies still needs to be improved, the following phenomena will occur in the straight thread produced: (1) The screw thread gauge of the end thread exceeds 3P (P is the pitch). (2) The length and outer diameter dimensions do not meet the design requirements. (3) End stop gauge through thread trails. (4) Cracks. (5) Through-end thread plug gauges cannot be screwed into both ends of the coupling sleeve and reach the screw-in length.
The above phenomena have not only brought a lot of trouble to the construction, but also made the project quality without any guarantee. To this end, our company organizes technical staff to summarize the reasons, mainly due to the following two points: First, the sleeve material is not satisfactory, after processing cracks; Second, poor processing machinery maintenance, there are large tolerances. In this regard, it is hoped that the construction and quality control units will perform the following prevention and control measures: (1) A certificate must be issued for the approach of the sleeve, and the sleeve should be properly protected during transportation and storage to avoid rain, contamination, mechanical damage, etc. . (2) Operation The machine tool should be strictly in accordance with the operating instructions of the machine tool.
