Norck, a leading digital manufacturing company, provides extremely reliable, top quality, and fast injection molding, and overmolding projects for a wide range of industries including aerospace, defense, robotics,  industrial, automotive, electronics, energy, hardware, and consumer products. Our team of highly qualified engineers and cutting-edge facilities will provide you with quality products with the quickest turnaround time at a competitive price. Whether you have high volume production projects or rapid protototyping needs, Norck can manage it with the results better than expectations.

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Let’s give you some insight how Norck achieves overmolding.

It is a plastic injection molding process that combines multiple plastic materials. The mold for overmolding is made from hardened steel to withstand the pressure and heat of the overmolding process. Overmolding mold is unique compared to insert molding and injection molding mold. The overmolding process is used for high and medium-volume production

Overmolding is used for several purposes, such as:

   • Improving the grip of a component
   • Prevent vibration
   • Add sealing

Overmolding offers many advantages:

• A rigid connection: The injected plastic englobes the insert, which results in a rigid connection between materials
• Accuracy: Overmolding offers tight tolerances, around ±0.05mm.
• More rigid threads: The inserts are added to a plastic part to avoid wearing of threads in plastic material.
• No need for fasteners: There is no need for post-molding operations as the molded parts come off the mold and can have a mirror glass surface, mat color, or texture.
• Low production costs: The production cost is reduced since post-machining operations are reduced or eliminated.

But there are some disadvantages as well:

   - Longer cycle time
   - Higher cost

There are two types of overmolding:

I. Two Shots overmolding:

1. Plastification: The plastic granules are transferred from the hopper to the mold using a rotating screw and molted using heaters.

2. First shot: The screw will advance to increase pressure in the injection chamber to inject the molted plastic into the mold. The two cavities are maintained close until the plastic solidifies

3. Die rotation: After injecting the 1stshot, the Die is opened and rotates until the injected part meets the 2ndshot cavity.

4. Second shot: The mold is closed again, and 2ndmaterial is injected into the mold.

5. Ejection: After the molted plastic solidifies using a cooling circuit, the Die is opened, and the part is ejected via ejector pins.

II. Co-injection molding (2k/3k injection mol):

1. Plastification: The plastic granules are transferred from both hoppers to the mold using a rotating screw and molted using heaters.

2. First material injection: The first material is injected after closing the mold.

3. Second material injection:The second material is injected without opening the mold.

4. Ejection: After the molted plastic solidifies using a cooling circuit, the Die is opened, and the part is ejected via ejector pins. The screws will retreat to prepare for the next injection.

Obtaining a fully functional part might require extra processing for features that can’t be made with the overmolding process, such as taping. The designed part should follow Overmolding and overmolding design guidelines.

Norck, a leading manufacturing company driven by technology, high quality data and artificial intelligence, focuses on manufacturing excellent quality of sheet metal parts, custom parts and components, a wide range of 3D printed parts and moldings. It is a single source for a wide of range of companies around the world for their need of sheet metal fabrication, CNC machining, 3D printing, and molding. 

Besides its own production capacity, Norck’s ability access to a huge amount of manufacturing capacity of its top quality partners across Europe and the U.S allows it to provide its customers with low and high volume production, rapid prototyping and a wide range of manufacturing services from sheet metal fabrication to 3D printing.

Norck’s data-driven AI approach to manufacturing maximizes its overall product and service quality, while minimizing the overall cost of its parts and services. This leads to high quality products, better inventory programs for our customers worldwide, better visibility for supply chain management.

Norck’s team of manufacturing engineers, mechnical engineers, quality engineers, supply chain engineers, industrial designers, artificial intelligence engineers, data scientists, and software application developers work in a unique and coherent way to provide your company with high quality manufacturing parts and services, better design for manufacturability and all driven by data and artificial intelligence.

As a single source for all your manufacturing needs, Norck minimizes your overhead cost, diversifies your supply chain, improves your parts’ design for manufacturability, significantly improves the quality of services and parts you outsource, minimizes suppliers’ risks, improves your purchasing power, and provides the goods and services with a philosophy of just in time.