Analysis of Injection Mold Base Classification Systems
The injection mold base serves as the skeletal framework of a mold, supporting the molding system, guiding mechanisms, and ejection devices. Its classification directly impacts mold rigidity, machining efficiency, and cost control.
I. Classification by Standardization Level
Standard Mold Bases (LKM/DME Standards)
Standard injection mold bases utilize prefabricated template components (e.g., LKM's A/B/C series), with specifications ranging from 2020 to 8080. Features like guide pillars and ejector pin holes are machined to ISO standards, reducing procurement lead times by 40%. These bases suit 80% of conventional injection molds.
Custom Mold Bases
Tailored for specialized product structures (e.g., automotive bumper molds), custom injection mold bases require additional auxiliary plates or irregular-shaped templates.
II. Classification by Structural Design
Two-Plate Mold Base
The basic injection mold base structure consists of fixed and moving mold halves with a single parting line. Suitable for over 90% of simple plastic parts, total thickness typically ranges from 300–600 mm.
Three-Plate Mold Base
Incorporates a stripper plate on the fixed side to automatically separate the runner system, enhancing efficiency in injection molds with complex gating requirements.
Hot Runner Mold Base
Dedicated injection mold bases integrated with hot runner systems require thermal insulation layers (3–5 mm air gaps) and pressure-bearing rings to manage heat distribution.
III. Classification by Material Type
Pre-Hardened Steel Bases (P20/718 Series)
With hardness HRC28–32, these injection mold bases allow direct cavity machining. For example, 718H steel bases achieve 500,000 cycles in appliance housing molds.
Quenched Steel Bases (S136/H13 Series)
High-wear-resistant bases (HRC48–52) are ideal for glass-fiber-reinforced materials. S136 bases resist abrasion from 30% GF-PA66 in automotive engine cover molds.
Lightweight Bases (Aluminum/Beryllium Copper)
7075 aluminum injection mold bases reduce weight by 60% for quick mold changes, though rigidity must be compensated with reinforcement ribs (rib-to-thickness ratio 1:0.6).
