In addition to mastering basic drawing knowledge (such as mechanical drawing, tolerance standards, drawing software tools, etc.), injection mold design engineers also need to master some necessary injection molding professional knowledge:
1. Be familiar with performance knowledge of plastics.
2. Understand knowledge of injection mold structure design.
3. Understand relationship between product structure and mold structure.
4. Understand injection mold processing method and processing process flow.
5. Understand matching relationship between injection molding machine and injection mold.
6. Understand relationship between mold structure and injection molding process.
7. Understand relationship between mold structure and injection molding defects.
8. Understand performance knowledge of mold steel.
9. Understand requirements of scientific mold trial and mold following work.
10. Understand acceptance criteria for injection molds.

1. Improve scientificity and rationality of injection mold structure design.
2. Further improve ability and work quality of mold designers.
3. Quickly improve mold quality and extend mold service life.
4. Broaden scope of injection molding process and improve stability of injection molding.
5. Improve quality of injection molded parts and injection molding production efficiency.
6. Reduce number of mold trials, mold changes, and mold repairs.
7. Shorten new product development cycle to satisfy customers.
8. Ensure that injection molding production reaches state of "high quality, high efficiency, and low consumption".
9. Reduce various wastes caused by machine adjustment difficulties and reduce injection molding production costs.
10. Improve core competitiveness of injection molding companies.

1. Good injection molding starts with scientific mold design.
2. Do it right from beginning and do it well from beginning (do a good job of review before design and manufacturing, and clarify requirements).
3. Focus on optimizing effects of three flows of injection molds: material flow, air flow, and heat flow.
4. "High-quality products are designed", not produced by injection molding machine adjustment.
5. By optimizing mold, expand scope of injection molding process, ensure smooth and stable injection molding.
6. Reduce flow resistance of molten material in mold from mold design.
7. Improve product internal stress and deformation from mold design to improve product quality.
8. Prevent mold damage from mold design and extend mold service life.
9. Reduce number of mold trials and mold changes by optimizing mold design.

 

1. Avoid designer's strong subjectivity and arbitrariness.
2. Consider problem comprehensively (systematic and scientific thinking).
3. Be good at collecting information related to mold design.
4. Influenced by past experience or design ideas.
5. Lack of consideration of mold structure for injection molding.
6. Actively participate in mold trial process on site.
7. Be good at summarizing reasons for past design failures.
8. Pay attention to details of mold design (details determine success or failure).
9. Overly rely on mold trial to correct errors (many mold trials and mold changes).
10. Take initiative to investigate and understand problems of previous mold designs with similar structures.
11. Always think that the fewer gates, the better or the smaller gate, the better (reduce processing manpower).
12. Order of considering mold design requirements is wrong.
13. Relationship between mold structure and injection molding defects is not well understood (lack of foresight).

1. Consider flowability (FMI) and thermal stability of plastics.
2. Consider molding properties of injection molding process (mold matching process).
3. Consider quality requirements of injection molded parts.
4. Consider matching of mold and injection molding machine.
5. Consider technical specifications and functions of injection molding machine.
6. Consider requirements for injection molding production automation.
7. Consider processing requirements of mold.
8. Consider installation requirements of mold.
9. Consider order volume and service life of mold.
10. Consider injection molding efficiency (capacity) of mold.
11. Consider manufacturing cost of mold.
12. Consider loss of plastic raw materials.
13. Consider processing method of gate.
14. Consider processing manpower required for machine position.

 

Ensure that molten material can smoothly fill cavity and reach all corners of cavity at the same time, so that it can be cooled and solidified under uniform conditions (uniform shrinkage), and stably inject products that meet customer requirements to achieve state of "high quality, high efficiency, and low consumption".

1. Able to enter and exit (molten material can enter and gas can exit).
2. Two uniformities (uniform glue feeding and uniform cooling).
3. Three positioning (internal positioning, external positioning, guide pin\guide sleeve positioning).
4. Four balances (glue feeding, expansion force, ejection, thermal balance).
5. Five consistency (consistent filling, expansion, cooling, shrinkage, and demolding).
6. Durable (resistant to extrusion, impact, wear, and corrosion).

1. "Material flow"-needs to be fast and smooth (meet needs of glue feeding and glue filling).
2. "Air flow"-needs to be unobstructed (inlet and outlet are unobstructed).
3. "Heat flow"-cooling needs to be consistent (cooling and shrinkage are uniform).
For future reading, please refer to "Talking about mold optimization from perspective of injection molding process 2, 3, 4, 5, 6, 7, 8".