Mold making of plastic injection molds & components

Tooling and Injection Molds-making at BEST PRECISION TOOLS

March 18,2022

By Admin

Tooling and Mold making is the process of deriving the manufacturing components and machine parts needed for Injection Molds production. It includes sourcing and obtaining all mold components and machine parts that are essential for the manufacturing process. The most common categories are fixtures, jigs, gauges, molds, dies, cutting equipment, and patterns.

Tooling is an important process as it reflects the quality of the finished product at the end. Tooling not only produces finished quality parts, but the properties, speed, accuracy, repeatability in production, the volume of producing a machine component all depend on this tooling process. If tooling is perfect, then the whole manufacturing process is streamlined.

Injection Molds Tooling- A step by Step Process

Tooling is not a single-step process, it undertakes different stages of production as follows,

Manufacturing and Feasibility

The most crucial step in Injection Molds tooling is to check whether the tooling process is workable or not.

During the beginning stage, the Plastic Molds Manufacturer with a team of engineers and technicians determines the product specifications, component functionality, and material specifications. They identify potential operational problems that may occur during production. The team also looks for the solutions to the problems and finds if there is any scope for further improvements or enhancements. They also check the physical and chemical properties of the selected resins.

Design

Prototypes of 2D and 3D design models will provide a view of the mold geometry and sizes. These models are constructed to check mold sides and steel sizes.

Final Design Approval

The detailed design is finalized, reviewed, and approved for the further tool-building process. After final adjustments, the specifications are fed into the tool builder, and a mold is created. Best precision tools produce Injection Molds with high specifications and dimensional tooling requirements.

Construction of Primary and Secondary Tools

Exhaustive tool drawings developed with construction standards are reviewed and verified. Once the drawings are verified at all the engineering levels and aspects, then they are fed into the tool builder. The complete process is monitored from the beginning till the end. Just make certain with a comprehensive checklist for final approval.

In-House Tool Building Process

As the parameters are confirmed, the initial samples are produced by Plastic Components Manufacturer. The process is carried out through defined, scientific molding practices. Final parts are sent for final check and qualification. The quality is determined by filling the profile over time using cavity transducers kept in mold.

Final Tool Correction

After acquiring the results of inspected sample molds, any required adjustments or improvements can be carried forward. If the process is perfect, then the detailed process is documented for future reference. Injection Molds components are prepared using these tools and are always submitted to the client for approval before stepping into final large-scale production.

Considerations of Injection Molds Tooling

  • The part design is the first consideration in the tool-making process. As discussed above the part size, dimensions, volume, and quality should be determined while developing the mold-making process.
  • Choose Cam Action tooling if your molded parts need holes and handles. Cam actions are used for casting undercuts, holes, and sliding plates. It adds up to the complexity of the maintenance of the machine.
  • The lifter components in ejection systems move at an angle to mold the geometry of a machine part. The lifters should be visible before cutting.
  • The molding environment includes criteria like type of press, clamping pressure, barrel capacity, and mounting systems.
  • Additional considerations in mold design structure are that it has a clear location of water fittings, cooling systems, and wiring preferences.

Injection Molds Making Process

The mold-making process covers 6 steps followed after analysis, tool designing, and efficient production of molded plastic parts.

Clamping

The two halves of the mold are clamped together and then melted plastic is injected into the mold. It is designed as such from both halves, one half can slide. When two clamps join together tightly, then the material is injected.

Injection

Plastic pellets from the hopper to the injection molds machine are sent through injection units. The heat of the barrel and pressure melt the pellets. The derived molten plastic called “ shot ” is injected into the machine. The injection time depends on how fast the mold is filled. The injection pressure ranges from 35-140 MPa. A hydraulic system is used to control the pressure and speed of the process.

You can also opt for Machines like CNC Machining and electric discharge machining. The manufacturing process is systemized using computer-aided- design (CAD) and (CAM) in CNC machines. The manufacturing process is highly automated.

In Electrical discharge machining (EDM), desired design molds are obtained with an electrode, and fabricated out of graphite or copper. The process is slower, but it carries the added advantage that the pre-hardened molds can be shaped and eliminate the scope of additional heat treatment.

Cooling

Once the Precision Injection Moulding is done, it is set to cool for some time and we can acquire hardened molds. Based on the thermodynamic properties of plastic, the mold hardening time differs from each other.

Ejection

This is the last stage in mold making called ejection. When the mold opens, a part is pushed out with great force. The clamps are shut again and the next process begins.

As final notes, tooling and mold making together are like the backbones of the injection molding process. For the smooth running of the machinery, making the best tooling development is the core thing. Best precision tools are expertized company in tooling and mold development. As we excel in our foundation tooling process, we provide high-quality engineered machine parts at cost-effective prices. Let you purchase mold parts with contentment from the best precision tools!