How do you avoid damage when heating a bearing while reducing your operating costs?
Time：10 Jan,2022
<p style="text-align: center;"><img src="/ueditor/php/upload/image/20220110/1641751130364866.png" title="1641751130364866.png" alt="6.png"/></p><p style="text-align: justify;"><span style="color: rgb(0, 0, 0);">The way you mount your bearings and sprockets is essential to the performance of your equipment. When it comes to <a href="https://www.sunspeedbearing.com/products/catalogue.html" target="_blank" style="color: rgb(0, 112, 192); text-decoration: underline;"><span style="color: rgb(0, 112, 192);"><strong>bearings</strong></span></a> alone, 17% of damage is due to poor mounting. As such, this process plays a critical role and deserves special care and attention.</span></p><p><br/></p><p style="box-sizing: inherit; font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; margin: 0px 0px 0.5rem; padding: 0px; color: rgb(30, 30, 30); text-rendering: optimizelegibility; line-height: 1.4; font-size: 1.065rem; white-space: normal; background-color: rgb(255, 255, 255); text-align: justify;"><span style="color: rgb(0, 0, 0);">A) Reminder</span></p><p style="text-align: justify;"><span style="color: rgb(0, 0, 0);">Hot mounting allows, by heating up a part of revolution, to expand the bearing's inner ring or a sprocket’s bore, so that it can effortlessly be fitted onto the shaft.</span></p><p style="box-sizing: inherit; font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; margin: 0px 0px 0.5rem; padding: 0px; color: rgb(30, 30, 30); text-rendering: optimizelegibility; line-height: 1.4; font-size: 1.065rem; white-space: normal; background-color: rgb(255, 255, 255); text-align: justify;"><br/><span style="color: rgb(0, 0, 0);">B) Avoid the pitfalls</span></p><p style="text-align: justify;"><span style="color: rgb(0, 0, 0);">Important: parts must never be heated with a blowtorch.</span></p><p style="text-align: justify;"><span style="color: rgb(0, 0, 0);">Heating a part too quickly and aggressively can alter the material's properties and thereby significantly reduce its service life. There may also be other consequences:</span></p><p style="text-align: justify;"><span style="color: rgb(0, 0, 0);">Bearings: expanding the inner ring faster than the outer ring creates significant stress on the rolling elements and may damage the actual elements or the raceway.<br/>Therefore, you are strongly advised to use appliances that keep the difference in temperature between the bearing's two rings under control.</span></p><p><br/></p><p style="text-align: justify;"><span style="color: rgb(0, 0, 0);">Sensitive parts such as sprockets: considerable mechanical stresses may be exerted on the teeth. Uneven heating may deform the sprocket, with teeth subsequently breaking under stress.</span></p><p style="text-align: justify;"><span style="color: rgb(0, 0, 0);">Linear and even heating can help prevent this type of risk. An oven may be used, or a more convenient solution is an induction heating system.</span></p><p><br/></p><p style="text-align: justify;"><span style="color: rgb(0, 0, 0);">In addition, the temperature must be high enough (maximum of 130°C for a bearing) to generate sufficient expansion and temporarily loosen the fit, so that the sprocket or bearing can easily be mounted.</span></p><p style="text-align: justify;"><span style="color: rgb(0, 0, 0);">The heating temperature depends on the ambient temperature and also the fit and material of the bearing seat.</span></p><p style="text-align: justify;"><span style="color: rgb(0, 0, 0);">To guarantee the integrity and easy mounting of the part that needs heating while ensuring operator safety, induction heating is the most recommended method.</span></p><p style="text-align: justify;"><span style="color: rgb(0, 0, 0);"> </span></p><p style="box-sizing: inherit; font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; margin: 0px 0px 0.5rem; padding: 0px; color: rgb(30, 30, 30); text-rendering: optimizelegibility; line-height: 1.4; font-size: 1.065rem; white-space: normal; background-color: rgb(255, 255, 255); text-align: justify;"><span style="color: rgb(0, 0, 0);">C) Induction heating principle</span></p><p style="text-align: justify;"><span style="color: rgb(0, 0, 0);">The device is comprised of a laminated steel core surrounded by a coil with multiple windings. When a current passes through it, this primary coil generates a magnetic field which itself induces an electric current in the part to be heated (steel part), similar to the short-circuited secondary coil of an electrical transformer.</span></p><p style="text-align: justify;"><span style="color: rgb(0, 0, 0);"><br/></span></p><p style="text-align: justify;"><span style="color: rgb(0, 0, 0);">Induction heaters offer the following advantages:</span></p><p style="text-align: justify;"><span style="color: rgb(0, 0, 0);">Even and controlled heating of sensitive parts, such as sprockets and bearings used in sensitive applications</span></p><p style="text-align: justify;"><span style="color: rgb(0, 0, 0);">Temperature control<br/>One or two probes can be used to maximise the safety of the component to be heated and thereby prevent any alteration of its physical properties</span></p><p style="text-align: justify;"><span style="color: rgb(0, 0, 0);">A cost-effective and environmentally friendly heating method</span></p><p style="text-align: justify;"><span style="color: rgb(0, 0, 0);">Safety for operators<br/>Only the part to be heated is subjected to an increase in temperature, which means easier handling and a lower risk of burns</span></p><p style="text-align: justify;"><span style="color: rgb(0, 0, 0);">Heating data can be extracted to maintain a record of the heating conditions</span></p><p><br/></p><p style="box-sizing: inherit; font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; margin: 0px 0px 0.5rem; padding: 0px; color: rgb(30, 30, 30); text-rendering: optimizelegibility; line-height: 1.4; font-size: 1.065rem; white-space: normal; background-color: rgb(255, 255, 255); text-align: justify;"><span style="color: rgb(0, 0, 0);">D) Other heating methods can be used</span></p><p style="text-align: justify;"><span style="color: rgb(0, 0, 0);">Oil bath: requires a recipient and perfectly clean oil. The uniformity of the heating temperature may be an issue, as well as pollution caused by the use of oil</span></p><p style="text-align: justify;"><span style="color: rgb(0, 0, 0);">A heating table: cannot be used for sealed bearings. In addition, you are advised to insert a wedge between the plate and the mechanical component to be heated</span></p><p style="text-align: justify;"><span style="color: rgb(0, 0, 0);">An oven</span></p><p style="text-align: justify;"><span style="color: rgb(0, 0, 0);">The technique of contracting the shaft by cooling with liquefied gas can also be used</span></p><p><br/></p>
