I. Application Background and Severe Challenges

In precision casting (especially cold box and no-bake sand processes), the metering and conveying accuracy of benzenesulfonic acid as an acid catalyst (curing agent) directly determines the curing speed, strength of molding sand and surface quality of castings. Benzenesulfonic acid is highly acidic and corrosive, with obvious viscosity changes with temperature. Due to the large temperature difference in foundry workshops, traditional conveying solutions have long been plagued by pump corrosion, flow drift and loss of accuracy.

II. Pain Points of Traditional Solutions: Imported U.S. PPS Plastic Gear Pumps

Previously, the industry widely relied on imported U.S. PPS (polyphenylene sulfide) plastic gear pumps. Although PPS has certain corrosion resistance, three prominent problems emerged during long-term operation:

III. JONSN Innovative Solution: Hastelloy C-276 Precision Micro Gear Pump

1. Why choose Hastelloy C-276?C-276 is a nickel-chromium-molybdenum-tungsten alloy with excellent corrosion resistance, capable of withstanding most highly corrosive media, including the strong corrosion of benzenesulfonic acid at high temperatures and concentrations.

· Extremely low thermal expansion sensitivity: The integrated homogeneous design of metallic Hastelloy C-276 with the pump body and gears ensures highly constant precision fitting clearances between gears and pump chambers in a wide temperature range from -20°C to 150°C. It effectively avoids clearance fluctuations and flow accuracy drift of plastic pumps caused by temperature changes.

· Excellent wear and corrosion resistance: Even when conveying benzenesulfonic acid curing agent containing solid impurities, the wear-resistant service life of alloy gears is several to more than ten times that of PPS plastics, with almost no flow attenuation during long-term operation.

2. Empowered by JONSN Precision Machining TechnologyJONSN pumps adopt ultra-precision grinding and micron-level matching processes to ensure micron-level control of gear meshing and end clearances.

· Extremely low internal leakage: With constant and optimized clearances, the pump’s volumetric efficiency reaches over 95%.

· Linear flow output: The displacement per revolution is accurately consistent. Coupled with servo motor drive, it achieves repeat metering accuracy within ±0.5%, meeting the stringent requirements of high-end casting processes for curing agent addition ratio (usually 0.3%–2.0%).

IV. Detailed Explanation of Metering and Conveying Application Scheme

Application Case: As a well-known domestic enterprise in no-bake sand equipment, Jinan Foundry Machinery Co., Ltd. has equipped JONSN C-276 gear pumps in batches in its intelligent sand mixing system for accurate proportioning of furan resin/benzenesulfonic acid curing agent. After commissioning, the metering accuracy is stably controlled within ±0.5%, effectively solving the problems of temperature drift and wear attenuation of the original plastic pumps. The consistency of sand mixing quality is significantly improved, and the equipment delivery cycle is shortened from months to weeks, greatly enhancing the overall competitiveness and customer satisfaction.

VI. Achieving Long-Cycle, Low-Commissioning, High-Precision Metering

JONSN Hastelloy C-276 precision micro gear pump successfully integrates high corrosion resistance with high-hardness precision machining. It is not just a replacement for imported U.S. PPS plastic pumps, but a comprehensive performance upgrade. It greatly reduces the troubles of "temperature change, wear and waiting" in the curing agent conveying system of foundry machinery, realizing long-cycle, low-commissioning and high-precision metering.