Injection mold making involves engineering review, mold design, material selection, machining, assembly, and mold trials before a mold is ready for production use. Each stage affects mold accuracy, surface finish, functionality, and expected service life.
At Soul Chain, our engineering and production teams coordinate key manufacturing stages, including DFM review, CNC machining, EDM, mold assembly, dimensional verification, and mold trials in Taiwan. This article explains the manufacturing workflow and the capabilities used to build and verify custom injection molds before delivery.
What Is Injection Mold Manufacturing
Injection mold manufacturing is the process of designing and building tooling used to produce plastic parts through injection molding. Unlike injection molding itself, which produces plastic components, mold manufacturing focuses on the tooling that helps define part geometry, surface quality, and molding performance.
A typical project may include DFM review, mold design, steel selection, CNC machining, EDM, polishing, mold assembly, and trial injection molding. The exact scope depends on the part and project specifications.
Why Mold Quality Matters
Mold quality affects the consistency, reliability, and maintainability of the finished tooling. Each stage of mold manufacturing—from material selection and mold design to machining, assembly, and mold trials—can influence the final mold performance. Properly designed and manufactured tooling helps support the specified part dimensions and appearance while reducing the risk of unnecessary mold adjustments and maintenance. Actual molding results also depend on factors such as resin, injection machine settings, and production conditions.
Our Mold-Making Workflow
DFM Review & Moldflow
Before machining begins, DFM review considers part geometry and potential manufacturing concerns. Where required, Moldflow analysis can help assess gate locations, filling balance, pressure, weld-line positions, and cooling trends. These evaluations support engineering decisions but cannot eliminate all molding risks.
Mold Design
The mold design addresses the mold structure, gate locations, cooling channels, draft, ejection systems, and other features relevant to manufacturability and the molded part’s requirements.
CNC Machining and EDM
CNC machining produces mold plates, cores, cavities, sliders, inserts, and other components. EDM is used for features that are difficult to produce with conventional cutting tools, such as deep ribs, narrow areas, and sharp internal corners.
Polishing and Mold Assembly
Polishing is performed according to the required mold surface finish and product design. During assembly, components and moving mechanisms are fitted and checked to support proper alignment and operation before trial injection molding.
Look closer to mold surface finish clarification, see SPI Mold Finish Guide.
Mold Trials
Mold trials are used to evaluate mold functionality and molding behavior, identify issues, and determine whether adjustments are needed. Trial stages and the number of trials depend on mold complexity, trial results, and project requirements.
The mold-making workflow typically includes DFM review, mold design, steel preparation, machining, assembly, inspection, and mold trials. For a step-by-step explanation of how these stages come together, see our guide on how a plastic injection mold is made.
Our Mold Manufacturing Capabilities
CNC Machining
CNC machining is used to manufacture mold cores, cavities, mold bases, and other components. Soul Chain’s engineering and production teams manage machining specifications and coordinate development to address critical dimensions and tolerances.
EDM
EDM is used for mold features that are difficult to produce through conventional cutting, including deep ribs, narrow areas, sharp corners, and other complex geometries. It helps achieve the required details where conventional machining may be limited.
Mold Polishing
Mold polishing is carried out according to the product requirements, mold design, and specified surface finish. The required finish depends on the part’s appearance and functional requirements.
Dimensional Inspection
Inspection is performed according to the function and dimensional requirements of individual mold components. After CNC machining, critical dimensions of the core and cavity are checked on the machine. Additional checks depend on the component, project specifications, and agreed quality requirements. Relevant quality information can be shared upon request.
Die Spotting
Die spotting is used during fitting and assembly to assess contact at the parting surfaces and mold alignment. It helps identify fitting issues before trial injection molding.
Manufacturing Capacity and Development Coordination
Soul Chain maintains in-house manufacturing equipment for key mold-making and supporting processes. When additional capacity is required, qualified external machining partners may supplement in-house development. Our engineering and production teams coordinate specifications and critical requirements across the process.
These capabilities support Soul Chain's custom mold manufacturing projects for automotive, motorcycle, ATV, and personal watercraft applications. Plastic injection mold manufacturing capabilities.
Frequently Asked Questions
What is the difference between mold making and injection molding?
Mold making is the design and manufacture of the tooling. Injection molding is the process of producing plastic parts with that tooling. Soul Chain manufactures molds and conducts mold trials; we do not provide mass-production injection molding services.
How many mold trials are typically needed before mold approval?
The number of trials depends on mold design, part complexity, trial results, and project specifications. T0 is commonly used to identify initial issues; a follow-up trial can verify adjustments. More complex molds may require additional trials, such as T2. Not every project requires all stages.
How do you verify mold dimensions?
After CNC machining, critical dimensions of the core and cavity are checked on the machine. Inspection requirements for other components vary according to component function, dimensional requirements, and project specifications.
Why is DFM important?
DFM review helps identify potential manufacturability concerns before steel cutting. Discussing these issues early can reduce avoidable design changes during later stages.
What is the difference between CNC and EDM?
CNC machining removes material with cutting tools. EDM uses electrical discharge to machine selected features that may be difficult to reach with conventional cutting tools, such as deep ribs or sharp internal corners.
About Soul Chain
Soul Chain is a Taiwan-based plastic injection mold manufacturer established in 1998. Our engineering and production teams coordinate DFM review, mold design, machining, EDM, mold assembly, dimensional verification, and trial injection molding according to project requirements.
Contact Soul Chain to discuss your plastic injection mold project.
Contact Soul ChainSOUL CHAIN INDUSTRIAL CO., LTD.｜Tainan, Taiwan
