DFM and Mold Structure Design

Before mold steel is cut, the tooling team reviews the 3D part model, 2D tolerances, material, expected volume, assembly requirements, and cosmetic standards. This DFM stage confirms parting line, draft angle, shutoff, slider and lifter design, insert layout, wall thickness, ribs, bosses, texture, and ejection positions. A strong DFM review prevents common tooling problems such as flash, sink marks, drag marks, weak shutoff, difficult demolding, and avoidable mold modification.

• Parting line and shutoff should protect cosmetic areas and critical assembly surfaces.
• Slides, lifters, inserts, and core pulls must be designed for stability and easy maintenance.
• Critical dimensions need clear tolerance strategy before machining starts.

Mold Flow, Gate, Runner, and Cooling

Mold flow analysis helps predict filling balance, weld lines, air traps, pressure loss, shrinkage, and warpage. Gate position and runner design should fill the cavity smoothly while keeping the visible surface clean and the holding pressure effective. Cooling channels must remove heat evenly from thick and thin sections, because uneven cooling is one of the main causes of deformation and unstable cycle time.

• Gate location should support part strength, appearance, and dimensional stability.
• Balanced runners improve cavity-to-cavity consistency in multi-cavity molds.
• Cooling layout affects cycle time, warpage, and long-term production cost.

Precision Machining and Steel Control

Precision mold manufacturing depends on the correct combination of CNC machining, high-speed milling, EDM, mirror EDM, wire cutting, grinding, fitting, and polishing. Steel selection should match resin corrosiveness, glass fiber content, expected mold life, surface finish, and maintenance needs. Rilong's tooling center uses high-precision equipment and inspection control to keep cavity, core, insert, and electrode work within drawing requirements.

• CNC and EDM accuracy affects cavity fit, parting line quality, and dimensional repeatability.
• Wire cutting and grinding are important for inserts, shutoffs, and precision mold components.
• Polishing and texture preparation must match the resin, draft, and release requirements.

Mold Trial, Validation, and Correction

Trial production verifies whether the mold performs under real injection conditions. The team checks short shot, flash, sink, weld line, burn mark, warpage, gate vestige, ejection mark, surface defect, and critical dimensions. For precision molds, the first trial is not only about getting parts out of the mold; it is about defining a stable process window and confirming whether tooling corrections are needed before production approval.

• T0/T1 samples should be measured against 2D drawings and functional requirements.
• Process parameters should be recorded so changes are based on data, not guesswork.
• Correction plans should separate tooling issues from molding process issues.

Mold Types and Capabilities

• Single-color plastic injection molds and multi-cavity production molds.
• 2K, two-shot, multi-material, and overmolding tools.
• LSR injection molds, silicone compression molds, rubber molds, and keypad molds.
• Flip-top cap molds, medical soft-part molds, gaskets, housings, and precision inserts.
• Tooling support for medical, automotive, telecommunication, security, consumer electronics, sports, musical, and marine equipment.

What Customers Should Prepare

For faster quoting and more accurate mold design, provide 3D CAD files, 2D drawings with critical dimensions, material grade, shrinkage data if available, surface finish or texture requirements, target volume, sample quantity, assembly information, and special testing standards such as sealing, pull force, torque, drop test, or heat resistance.