みづほ合成工業所 List of Products and Services

Supporting the primary line from a 6600V transmission line and the secondary line after conversion to 200V with thick-walled thermosetting resin insert molding. It was challenging to achieve a straight product while maintaining a flatness of less than 0.1mm. There were numerous unstable factors such as material shrinkage, temperature distribution of the mold, and material flowability. However, by returning to the basics and utilizing our expertise in compression molding and mold structure, we resolved this issue. [Case Study] ■Product: High Voltage Terminal ■Material: Epoxy Resin (EP) Insert *For more details, please refer to the catalog or feel free to contact us.

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The overall imbalance of the fan is adjusted by changing the thickness of the blades in the mold to achieve weight balance. However, about 30 years ago, the precision of the molds was not very good, and it was common to repeatedly grind the molds to achieve balance. We boldly changed the mold structure to fundamentally solve this issue. Since then, we have utilized that experience even in the production of 3D-shaped radiator fans, enabling a quick response for mass production, including balance adjustments. Currently, we also own a balance testing machine to ensure proper quality control. 【Case Study】 ■Product: FAN & Radiator Fan ■Material: 6,6 Nylon with Glass (PA6.6 + 33% GF) Polypropylene with Glass (PP + 30% GF) *For more details, please refer to the catalog or feel free to contact us.

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The heart of the stepping motor, the coil, was deformed due to the injection pressure, starting from a point where it was almost defective. We tried to maintain the molding conditions with the lowest possible injection pressure and keep the mold temperature as high as possible to stop the deformation, but it did not go well. While we were experimenting, we made a significant mistake in one process and continued molding without realizing it. However, that mistake resulted in a good product and became a new method of handling. [Case Study] ■Product: Rotor ■Material: Polyphenylene Sulfide (PPS) Coil Insert *For more details, please refer to the catalog or feel free to contact us.

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Delamination refers to a defect where the product appears to be visually perfect, but in reality, it has become hollow inside, resulting in a complete loss of physical properties. Moreover, this defect does not occur immediately after molding; it is a very concerning defect that arises several hours later. By changing the molding conditions and the mold, we were able to successfully eliminate the defect entirely. [Case Study] ■ Product: Inverter case (including main body, operation panel, etc.) ■ Material: Polyphenylene ether (PPE) Polyphenylene oxide (PPO) *For more details, please refer to the catalog or feel free to contact us.

• Resin processing machine
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It is a simple shape with a length of 90mm and a diameter of φ15mm, but this product consistently experienced defects where it would break in half from the middle once every 1 to 2 years (annual production volume of 30,000 to 50,000 units). By changing the molding method from transfer to compression, as well as automating the material feeding process and the surrounding molding equipment, we successfully achieved a zero defect rate and reduced costs. 【Case Study】 ■Product: Arc extinguishing rod ■Material: Urea resin (UF) *For more details, please refer to the catalog or feel free to contact us.

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• Resin processing machine
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Mizuho Gosei Kogyo Co., Ltd. contributes to the longevity of molds (i.e., overall cost reduction) through mold structures and molding management optimized for thermosetting resins. Our representative molded products made from thermosetting resins include electrical terminal terminals that can withstand high voltage and arcing, coil bobbins for transformers, and fire prevention-related products designed to melt without losing their original shape during a fire. 【Features】 ■ From thin-walled products of 1.5mm to ultra-thick molded products exceeding 20mm ■ Contributes to the longevity of molds through management of molds and molding optimized for thermosetting resins ■ A wide range of process options based on required specifications and quantities *For more details, please refer to our catalog or feel free to contact us.

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• Processing Contract

At Mizuho Gosei Kogyo Co., Ltd., we offer a lineup of gapless molding machines ranging from 30 tons to 450 tons, and we optimize automatic machines necessary for improving production efficiency, such as insert molding, through in-house design and manufacturing. The main materials we handle include PPS with a heat resistance temperature of 150°C, as well as engineering plastics containing glass fiber and calcium carbonate. We have a wide range of achievements, from small mechanical parts such as gears, screws, and coil bobbins to housings. 【Features】 - A lineup of gapless molding machines from 30t to 450t - Proficient in producing high value-added products in a flexible production line with a variety of types - Skilled in precision mechanical parts that require strict dimensional tolerances for weight balance and center axis holes, such as fans and gears - Expertise in gas-assisted injection molding for hollow thick-walled shapes and addressing warping and sink marks in complex uneven thickness products *For more details, please refer to our catalog or feel free to contact us.

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• Processing Contract

At Mizuho Gosei Kogyo Co., Ltd., we offer a range of 3D printers with different work sizes and characteristics, allowing us to produce items from small to large without the need for molds. The material used is 12 nylon. Additionally, we can also create parts made from glass-filled nylon, which is suitable for applications requiring strength and heat resistance. We can accommodate various processing needs for functional evaluation, including coloring of printed products, vapor deposition plating, tapping, and press-fitting of insert fittings. 【Features】 ■ Capable of handling items from small to large (approximately up to 650mm x 300mm x 450mm) ■ Can also accommodate requests for larger products through segmented printing ■ Requests can be made with sketches or 2D data even without 3D data (note: data creation incurs additional costs) ■ We can assist with consultations for testing on actual machines, leveraging mechanical strength and elasticity ■ Supports coloring and vapor deposition plating *For more details, please refer to our catalog or feel free to contact us.

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• Processing Contract
• Contract manufacturing