Cost Gap Analysis Between Low-Pressure and Gravity Aluminum Casting Molds

The cost difference between low-pressure and gravity aluminum alloy casting molds is a key factor for foundry enterprises to select production processes, covering initial manufacturing, daily operation, maintenance and full-cycle comprehensive costs. In the industrial procurement market, gravity casting molds are favored by small and medium-sized manufacturers for their low initial investment, simple structure and low maintenance difficulty, which are suitable for small-batch, low-precision aluminum casting parts production such as ordinary mechanical accessories. Low-pressure casting molds, with precise pressure control systems, high-strength pressure-resistant steel materials and professional sealing structures, have higher processing precision requirements and longer production cycles, leading to higher manufacturing costs. However, in mass production scenarios, low-pressure casting can effectively reduce shrinkage cavity, porosity and other defects, with a casting yield rate up to 92%, far higher than 65%-70% of gravity casting. From the perspective of full life cycle, when the production batch exceeds 5000 pieces, the comprehensive cost advantage of low-pressure molds becomes prominent. In addition, the two types of molds also differ in replacement cycle: gravity molds have a service life of about 8000 batches, while low-pressure molds can reach 15000 batches, further diluting unit amortization cost. Enterprises need to select mold types according to production batch size, product precision requirements and long-term production plans to optimize cost control.