2results about How to "Dimensionally stable structure" patented technology

This invention discloses a drilling device for processing and producing wrought iron railings, relating to the field of wrought iron railing processing technology. It includes a support leg, a drilling mechanism, and a fourth transmission rail. The drilling mechanism is located on the top of the support leg, and the fourth transmission rail is installed on the top of the support leg. The drilling mechanism includes multiple positioning frames that slide on the top of the fourth transmission rail. Each positioning frame has a railing placement groove on its top to ensure the holes are at the same horizontal position. After drilling, the railings are directly welded and fixed, ensuring that the holes of the connecting pieces align with the connecting posts during subsequent bolt connections. This improves installation quality and avoids enlarged holes and misalignment of the railings after installation. This process ensures that the holes of the connecting pieces and connecting posts correspond perfectly, improving hole accuracy. Direct welding after drilling reduces process steps, increases processing efficiency, and ensures overall structural dimensional stability.

This application belongs to the technical field of high-temperature resistant foam materials, and specifically relates to a high-temperature resistant polymethacrylamide (PMI) foam material, its preparation method, and its applications. Addressing the deficiency of existing PMI foam materials where mechanical properties rapidly degrade at high temperatures, this application introduces maleimide monomers into the PMI foam material to improve the rigidity of the molecular chain segments. Then, through a crosslinking reaction between carboxyl groups and polyisocyanates, a high-temperature resistant PMI foam material is obtained. The PMI foam material exhibits excellent mechanical strength and a low rate of mechanical property degradation at high temperatures, enabling it to withstand loads and maintain structural dimensional stability under high-temperature conditions, making it suitable for use as a structural core material in the aerospace field.