Are there any specific case studies on how to improve pressure resistance performance?

This case study from a domestic automobile injection molding provider shows how the solution that was put in place greatly increased pressure resistance and dependability:

Case Background: Standard domestic direct-pressure vibration sensors with a rated pressure of 150 MPa were initially employed in a vehicle bumper hot runner production line. In reality, the hot runner's maximum working pressure was 120 MPa. The sensor failed and the diaphragm split and leaked twice after just three months of usage, resulting in mold cleaning shutdowns and decreased production capacity.

Optimization Solution (whole process modification from installation to selection):

Selection Upgrade: A 17-4PH stainless steel thick diaphragm was used to replace the sensor's original carbon steel diaphragm, increasing its thickness from 0.8 to 1.2 mm. The margin requirement of "rated pressure ≥ 1.5 times working pressure" was met by raising the rated pressure from 150 MPa to 200 MPa. Weak areas in the splicing seams were eliminated by switching from bolted connections to an integrated all-stainless steel welded enclosure.

Installation Optimization: In order to prevent direct molten material collision, the sensor that was initially placed directly across from the flow channel's molten material impact point was shifted to the side of the channel. A PTFE + metal composite gasket, which is resistant to high pressure and satisfies high-temperature requirements, was used in place of the original regular rubber gasket. In order to prevent overtightening and injuring the diaphragm or undertightening the sealing gap, the installation torque was meticulously controlled using a torque wrench as recommended by the manufacturer.

Maintenance Optimization: Every three months, the machine is disassembled to check for gasket deformation and clean the molten material crystals on the diaphragm surface. To avoid failure, the gasket is changed every 12 months.

Results of Optimization: The average sensor lifespan rose from three months to eighteen months following optimization. Leakage failures and diaphragm breaking vanished. Sensor pressure failure downtime was eliminated, saving over 100,000 RMB in maintenance and production losses and about ten unplanned downtimes a year.

With a cost increase of only roughly 20% over the original solution, this method is highly cost-effective for enhancing the pressure resistance of the majority of hot runner contact molten material vibration sensors.