Mirror Plastic Mold Steel PMS is a precipitation-hardening aging steel known for its outstanding mirror finishing capabilities, excellent hot and cold workability, electrical machining performance, and superior overall mechanical properties. The heat treatment process is straightforward: after solution treatment at 850 ± 20°C, the microstructure becomes a dual-phase of bainite and martensite following aging at 500 ± 10°C. This results in minimal heat treatment deformation (≤ -0.05%). For sections with diameters ≤ 150mm or thicknesses ≤ 150mm, the hardness distribution is uniform. Mechanical properties include a yield strength (σs) over 980MPa, tensile strength (σB) exceeding 1200MPa, elongation (δ5) greater than 13%, and reduction of area (ψ) above 45%. It is ideal for manufacturing plastic molds operating at around 300°C, with a hardness range of HRC 30–45, especially where high mirror finish and precision are required. PMS steel also exhibits excellent nitriding surface hardening properties, achieving a surface hardness of HV 800–1200 after treatment. It is widely used in optical systems, such as lenses, audio and video tape casings, phones, and various plastic housing molds including tape recorders, quartz clocks, washing machines, vehicle lamps, and instrument appliances. Rapid Tooling Technology is an efficient and practical method for mold production. Its main advantages include a short production cycle, simple process, easy implementation, low cost, high accuracy, and long service life, meeting specific functional needs while offering strong economic benefits. It is particularly suitable for new product development, trial production, process validation, and multi-variety, small-batch manufacturing. With the intensifying market competition, the pace of product updates has accelerated, making many varieties and small batches a key production model in the industry. As a result, there's a growing demand for rapid prototyping and mold manufacturing. This has driven the dynamic development of rapid molding technology. Currently, several rapid mold-making techniques are commonly applied: 1. Rapid Prototyping-Based Modeling: This approach uses advanced material accumulation methods like stereolithography, laminated object manufacturing, selective laser sintering, 3D printing, and fused deposition modeling to create long-life metal molds or low-life non-metal molds. It offers technological advancement, low cost, and a short design and manufacturing cycle. 2. High-Speed Machining: Modern high-speed cutting tools operate at speeds up to 25,000 rpm. This significantly boosts processing efficiency by more than ten times, reducing molding time. The finished surfaces require only minor polishing, saving substantial grinding and polishing effort. 3. Aluminum Alloy Molds: Due to their light weight, good machinability, and high thermal conductivity, aluminum alloys have become increasingly popular in plastic mold manufacturing. Using aluminum can reduce production cycles and costs. Some foreign manufacturers already produce aluminum alloys specifically for plastic molds. These molds can last up to 100,000 cycles, and with cavity surface chemical treatment, their service life can reach 200,000 to 30,000 cycles.

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