Technology / product information

“Discoloration” refers to a phenomenon where the surface color of metal changes due to manufacturing processes or environmental factors. In aluminum die-casting, discoloration may occur on the surface of parts after casting, and this significantly affects product quality and customer satisfaction. In particular, for products where appearance and finish are crucial, suppressing discoloration is extremely important.

Main Causes of Discoloration in Aluminum Die-Casting
- Oxidation Reactions During Casting
Aluminum is highly prone to oxidation. Exposure to oxygen during casting or cooling can oxidize surfaces, causing color changes.
- Improper Use of Mold Release Agents
Mold release agents are essential for separating the product from the die-casting mold. However, if the composition is unsuitable, chemical reactions can occur during casting, resulting in discoloration.

Our Discoloration-Suppression Technologies
Discoloration is a major challenge in aluminum die-casting, but it can be mitigated with proper technology and process control. Utilizing our years of experience and technical expertise, we have established a manufacturing process that minimizes discoloration. Key measures include:
✔ Regular flux treatment to remove oxides and impurities from molten aluminum.
✔ Precision spray robots that apply release agents uniformly, preventing water droplet retention and black residue.
✔ Optimized and standardized casting conditions for stable production environments.
✔ Strict control of molten metal and mold temperatures during casting.

Features of Yamaguchi’s Aluminum Die-Casting
Our aluminum die casting technology differentiates itself from other companies in the following aspects:
Wide Range of Size Compatibility: Equipped with die casting machines ranging from 420t to a maximum of 800t, we can handle various product sizes, both large and small.
Integrated Production System: By performing everything from casting to precision machining and final finishing within our own factory, we achieve both quality assurance and short lead times.

Equipment
Aluminum Die-Casting Machine BD-V7EX800T
Aluminum Die-Casting Machine SD-420CH
Shot Blasting Machine

Quality Assurance and Production System
Quality Control System:
We implement a strict quality management process, conducting thorough visual and dimensional inspections at every stage from casting to finishing.

Facilities and Technical Capabilities:
Utilizing state-of-the-art die-casting machines and shot blasting equipment, we ensure high-quality consistency even in complex-shaped products.

Delivery Capability:
Our integrated production system allows us to optimize scheduling and provide flexible and prompt delivery.

Suppressing discoloration in aluminum die-cast products is extremely important for maintaining quality and improving customer satisfaction. At our company, we take measures such as flux treatment to remove impurities, optimal release agent application using spray robots, standardization of casting conditions, and thorough temperature management to minimize the occurrence of discoloration.
Furthermore, with die-casting machines ranging from 420t to 800t and a fully integrated production system, we ensure stable quality and rapid delivery.
Going forward, we will continue to focus on technological innovation and quality improvement to provide high-quality aluminum die-cast products with minimal discoloration.