低圧ダイカスト

Process Overview

Low-pressure die casting (LPDC) is the preferred process when you need aluminum components that are both lightweight and structurally reliable. Unlike gravity casting, LPDC uses controlled gas pressure (0.02–0.1 MPa) to push molten aluminum upward into a permanent steel die. The slow, laminar fill eliminates the turbulence that causes gas porosity in conventional casting — the number one failure mode in structural aluminum parts. The result is a dense, homogeneous microstructure that responds well to T5 and T6 heat treatment, achieving tensile strengths of 250–310 MPa. This is why LPDC has become the dominant process for EV battery housings, wheel hubs, and rail transit structural frames. Our engineering team reviews every LPDC drawing for wall thickness transitions, gate placement, and solidification sequence before quoting.

Key Advantages

• Controlled laminar fill eliminates gas porosity — internal density superior to gravity casting
• Heat-treatable to T5/T6 — tensile strength 250–310 MPa achievable in A356/A357
• CT6–CT7 dimensional tolerance — consistent across production runs of 500 to 50,000+ pieces
• Ideal for medium-to-large aluminum components: 0.5kg to 80kg weight range
• Permanent die tooling amortized over long runs — lower per-part cost than sand casting
• Scrap rate typically under 2% with optimized gating and solidification design

Technical Specifications