Q: How to avoid deformation or breakage when using stainless steel hinges for heavy equipment doors (such as cabinets and industrial ovens)?
A: Dongguan Aoji Precision Hardware Co., Ltd. has summarized the following technical points based on years of experience in heavy-duty hardware production:
Mechanical structure design
Bearing type:
Ordinary hinges adopt a single axis structure, with a load-bearing capacity of ≤ 50kg;
Heavy duty hinges (such as our OHJ-70 series) are equipped with needle roller bearings, with a load-bearing capacity of up to 120kg and a switching frequency of over 100000 times.
Strengthening rib layout: The hinge arm is not designed as a flat surface, but is formed into an "I" - shaped three-dimensional support through stamping (as shown in the figure), which increases the bending strength by 40%.
Material thickness and process
Door weight ≤ 80kg: It is recommended to use 3mm thick 304 stainless steel plate, laser cutting to ensure that the edges are free of burrs and stress concentration.
Door weight>80kg: Made of 4-5mm sheet metal and subjected to heat treatment and tempering (hardness HRC28-32) to avoid internal microcracks caused by cold processing.
Installation supporting plan
Pre embedded installation: For concrete walls, we recommend using our hinges with expansion kits, which have a tensile strength three times higher than ordinary self tapping screws.
Distributed force design: Each door should be equipped with at least 3 hinges, and the top hinge should be ≤ 15cm away from the edge of the door frame to reduce deformation caused by leverage effect.
Customer Case:
The OHJ-70B hinge (4mm 316 stainless steel+ceramic coating) provided for a lithium battery production line in Shenzhen in 2023 successfully solved the problem of door sagging in high-temperature workshops, and its service life was extended by two times compared to traditional hinges.
Maintenance suggestion:
Check the torque of hinge screws every 6 months (standard value ≥ 5N · m);
High dust environments require regular application of high-temperature lubricating grease (such as molybdenum disulfide).