Injection mold processing and manufacturing is a very complex task. It requires going through the stages of injection mold design, processing, assembly, testing, and then mass production of products. Any mistake in any part of the process can affect the quality of the injection mold. For example, the following ten aspects are important factors that affect the quality of injection molds.

1. Mold Steel

Steel is a decisive factor in mold quality, and choosing the right steel is very important for manufacturing injection molds. Generally, the standards for selecting steel are:

1. Requirements for mold materials

Different plastic products require different types of steel for processing to meet high polishing and corrosion resistance requirements.

2. Surface treatment of molds

The surface treatment of molds is very important. Nitriding can continuously enhance the surface hardness of steel, effectively extending the service life of the mold. Electroplating can change the properties of mold steel to some extent, suitable for plastic parts that require high brightness and corrosion resistance. After electroplating treatment, injection molds can fully utilize electroplating to enhance and improve the performance of steel.

3. Steel price: Considering the cost of injection molds, mold steel should use materials corresponding to the mold's lifespan to avoid unnecessary waste during plastic injection molding.

2. Structural Design

A mature mold structure must consider not only the material properties of the product, such as shrinkage rate, molding temperature, elastic tensile deformation coefficient, etc., but also cooling water channels and opening/closing speeds. A reasonable mold structure design can effectively extend the mold's lifespan, ensure smooth production, improve efficiency, and reduce costs.

3. Mold Processing

To do a good job, one must first sharpen their tools. The arrangement of mold processes is particularly important; a reasonable process arrangement can accelerate production cycles, shorten processing time, and effectively save costs. More importantly, precise and reasonable processing can ensure stability during production and extend lifespan. Errors in processing can lead to welding issues; no matter how well welded, it is still a loss for the mold. Additionally, poor processing may affect mold movement, reduce lifespan, and even cause cracking or breaking during production.

4. Standard Parts

The capacity of a bucket is determined by its shortest wooden slat; this principle is well understood by everyone but often overlooked in practice. The same goes for molds; standard parts do not directly participate in forming but control the operation of the entire mold. Good standard parts should be wear-resistant, hard enough, high precision, and not easily deformed.

5. Collision (Flying Mold)

Collision relies on the experience of mold fitters; what seems like a simple task is actually one with high technical content. The complexity of molds mainly depends on this skill. Flat molds are the simplest; as long as there are no burrs or breaks on the parting surface, it is generally acceptable. Automotive parts molds are much more complicated; not only are their parting surfaces irregular, but they often include multiple sliders and ejector pins. Collision can also help improve and perfect other issues with the mold, making it a comprehensive task.

6. Polishing/Texture

Polishing is the final step in mold manufacturing. Polishing directly reflects on plastic parts; therefore, it is a very visible job. Polishing can also assist and complement mold movement, especially significant for demolding. Often some molds do not produce smoothly due to inadequate polishing, excessive resistance, or difficulty in demolding, even leading to white marks or cracks.

7. Mold Assembly

Mold assembly is like assembling a machine; every component and screw must be correct; otherwise, the consequences can be severe—ranging from product defects affecting production to completely damaging the mold and causing scrapping. Therefore, assembly work must be very meticulous. During assembly, special attention should be paid to cleaning the mold and ensuring cleanliness in water channels and screw holes.

8. Hot Runner or Cold Runner

The impact on mold quality from this aspect is actually minimal because hot runners are generally specified by clients, especially large clients. Well-known foreign brands excel in both quality and after-sales service; thus quality issues are generally rare. However, some domestic hot runners vary greatly in quality. Some small enterprises cut costs to gain price advantages by using unreliable heating and conduction components which can easily lead to problems. The main issue with cold runners is how to ensure balance in injection molding, gate size, injection pressure, etc.

9. Cooling Water Channels

Those with experience in molds know how important cooling is for a mold. Due to rising prices and labor costs, every second reduced from the injection cycle during mass production translates into unimaginable profits. However, speeding up production cycles can lead to increased mold temperatures; if temperature control is ineffective, it may cause molds to become too hot to form properly or even lead to deformation and failure resulting in scrapping. Therefore, excellent water channel design is particularly important including channel layout density, diameter, and interconnections.

10. Mold Maintenance

Mold maintenance mainly refers to maintenance and upkeep during production processes. Molds are like cars; if not used for a long time without maintenance they may become scrapped. Therefore every time a mold is used it should undergo comprehensive maintenance especially rust prevention for forming parts and moving components because molds come into contact with water during production which may get onto them during installation or disassembly; thus ensuring that molds are dry before applying a protective oil layer is essential.

The above are ten factors affecting injection mold quality introduced by Dongguan Shenke Mould Co., Ltd., which provides one-stop services including product design, mold development, manufacturing production, and quality control. If you have business needs please feel free to contact us by phone.