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Challenges in robotics: Part VIII - The art of Molding

Molding plays a critical role in the manufacturing process of robots and electronic devices. With the rapid growth of these industries, the need for effective molding methods and materials has become more important than ever. In this blog post, we will explore common materials, their pros and cons, popular molding techniques, and how manufacturers can improve their processes by considering molding best practices.

Common Materials for Molding

1. Thermoplastics: Widely used in electronic devices and robotic applications, thermoplastics are known for their versatility, ease of processing, and recyclability. Common examples include ABS, polycarbonate, and nylon.


  • Easy to process

  • Lightweight

  • Good mechanical properties

  • Cost-effective

  • Recyclable


  • Limited heat resistance

  • Can be sensitive to chemicals

2. Thermosetting plastics: These materials undergo an irreversible curing process, which gives them superior heat resistance and dimensional stability. Examples include epoxy, phenolic, and melamine.


  • High heat resistance

  • Good electrical insulating properties

  • Dimensional stability


  • Cannot be remelted or recycled

  • More difficult to process

  • Higher cost

3. Liquid silicone rubber (LSR): LSR is gaining popularity in the electronics and robotics industries due to its excellent temperature resistance, flexibility, and biocompatibility.


  • Excellent temperature resistance

  • Flexibility

  • Biocompatible

  • Good chemical resistance


  • Requires specialized equipment for processing

  • Higher cost

Common Molding Methods

  1. Injection Molding: Injection molding is a popular manufacturing process used for producing complex parts in high volumes. The process involves heating a material, injecting it into a mold, and cooling it until solidification.

  2. Compression Molding: This method involves placing a pre-measured amount of material into a heated mold cavity, closing the mold, and applying heat and pressure to shape the material.

  3. Transfer Molding: Similar to compression molding, transfer molding involves pre-heating a material and transferring it to a closed mold cavity using a plunger system.

  4. Reaction Injection Molding (RIM): RIM is a low-pressure process where two or more liquid components are mixed and injected into a mold, where they react and cure into a solid part.

Improving the Manufacturing Process Through Molding Manufacturers can greatly improve their manufacturing process by focusing on molding best practices. Here are some tips to consider:

  1. Material Selection: Choose the right material based on the desired properties, cost, and ease of processing.

  2. Mold Design: Optimize the mold design to minimize cycle time, reduce stress on the part, and improve overall part quality.

  3. Process Optimization: Use scientific molding principles and data-driven techniques to determine the optimal molding conditions and reduce variations in the process.

  4. Quality Control: Implement stringent quality control measures, such as in-process inspections and statistical process control, to ensure consistent part quality.

  5. Training: Provide continuous education and training to your workforce to stay updated on the latest molding technologies and best practices.

Conclusion Molding is a vital aspect of manufacturing robots and electronic devices. By selecting the right materials, mastering various molding techniques, and continually refining the manufacturing process, manufacturers can optimize production, reduce costs, and improve part quality. Staying informed about industry advancements and embracing innovation will keep your organization competitive in the ever-evolving world of robotics and electronics.



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