پیچ های ترکیبی به طور گسترده ای مورد استفاده قرار می گیرند و دارای اشکال مختلف ساختاری هستند

Publish time: 18 Nov 21

پیچ های ترکیبی به طور گسترده مورد استفاده قرار می گیرند و اشکال ساختاری مختلفی شناخته شده است. از یک پیچ تشکیل شده است و واشر بدون افت روی پیچ ثابت می شود. To this end, the washer is inserted into the screw blank, and then the thread is introduced into the screw mainly by thread rolling so that the screw is kept above the threads on the screw without losing.

برای پیچ های ترکیبی ، تفاوت سختی بین پیچ و واشر بسیار مهم است. This is especially true when the lower head surface of the screw and the washer are equipped with ribs, which are intended to prevent the screw from loosening during operation, for example due to vibration or temperature fluctuations. برای فشار دادن دنده پیچ به واشر، واشر باید نرمتر از پیچ باشد. In this case, the difference between the hardness of the washer and the hardness of the screw is required to be at least 40HV, and sometimes even 50HV. پیچ ها و واشرهای پیچ های ترکیبی معمولاً از آلیاژ فولاد ساخته می شوند و سختی آنها با عملیات حرارتی مناسب حاصل می شود. از آنجایی که آلیاژها و مواد اولیه مختلفی در اینجا دخالت دارند، این دو ماده باید در دمای خاصی عملیات حرارتی شوند. This causes the screw blank and the washer to be heat treated separately, and after the washer is applied, the thread must be rolled on the hardened screw blank. این به نوبه خود منجر به فرآیند نورد گران قیمتی می شود که با سایش ابزار بالا مشخص می شود. بنابراین برای حل این وضعیت. Technical research and development personnel provide a combined screw, which can achieve predictable, different, and particularly small hardness of the washer relative to the screw during the joint hardening process of the screw and the washer during its manufacturing process. According to this technology, it is achieved by a gasket material having a carbon content of 0.18% to 0.23%, a manganese content of 0.5% to 0.7%, and chromium content of 0.1% to 0.4%. With the combined screw provided by this technology, in the manufacturing process of the screw and the washer, and in the co-hardening process of the screw and the washer, the combined screw can realize the predictable, different, and particularly small hardness of the washer relative to the screw.

The basic idea of this technology is to limit the tolerance of the gasket material while retaining the commonly used alloys 3B2 and C22 on the market, so that the mechanical properties of the gasket, especially its hardness, can be planned in advance, so as to realize the commonality of screws and gaskets. فرآیند خاموش کردن و تمپر کردن، که می تواند به طور قابل اعتمادی سختی واشر متفاوت، به خصوص کوچکتر را در مقایسه با پیچ ها بدست آورد. Therefore, the thread rolling of the screw body can be performed after the washer is applied and before the quenching and tempering treatment, so that the rolling process of the combined screw manufactured by mass production can be performed at a reduced cost, especially when the tool wear is less in the case of.