The production process and injection molding maintenance of plastic molds

Firstly, plastic product process analysis.

Before designing the mold, the designer agrees that whether the plastic product conforms to the injection molding processing principle should be discussed in detail with the product designer. This includes discussions on the geometric shape, dimensional accuracy, and appearance requirements of the product, as well as minimizing unnecessary troubles in dual color injection molding.

Secondly, mold structure design.

A good set of molds not only requires good processing equipment and skilled two-color injection workers, but also another important factor is good mold design, especially for complex molds, where the quality of mold design accounts for more than 80% of the mold quality. One of the good mold designs is to reduce processing costs, reduce processing difficulty, and shorten processing time while meeting customer needs. This not only requires fully digesting the customer's needs, but also understanding the machine, processing technology, mold structure, and the processing capabilities of the mold factory itself. Therefore, to improve the level of mold design, it is necessary to:

1. Understand every detail of each mold design and understand the purpose of each component in the mold.

2. When designing, refer to similar designs from the past, understand the situation during mold processing and product production, and learn from their experiences and lessons.

In order to deepen the relationship between molds and machines and better understand the working process of machines.

4. Go to the factory to understand the processing technology of the processed products, and understand the characteristics and limitations of each processing.

5. Understand the trial results and modification situation of the molds designed by oneself, and draw lessons from them.

6. Maximize the use of previously successful mold structures during design.

Detailed understanding of the impact of mold inflow on products.

8. Study several special mold structures and understand new mold technologies.

Plastic molds

Thirdly, determine the mold material and select standard parts.

When selecting mold materials, not only should the accuracy and quality of the product be considered, but also the actual processing and heat treatment capabilities of the mold factory should be combined to make the correct choice. In addition, to shorten the manufacturing cycle, please make full use of existing standard components.

4、 Part processing and mold assembly.

The accuracy of injection molds is not only in accordance with the structure and reasonable tolerances during design, but also important for part processing and mold assembly. Therefore, the selection of processing accuracy and processing methods dominates in dual color injection molding. The dimensional error of formed products mainly consists of the following parts:

The manufacturing error of the mold is about one-third

The error caused by mold wear is about one sixth

The error caused by uneven shrinkage of formed parts is about one-third

The error caused by the inconsistency between the scheduled shrinkage and the actual shrinkage is about one sixth

5、 Exam mode.

From design to assembly, mold sets only account for 70% to 80% of the entire manufacturing process. The errors caused by the inconsistency between the predetermined shrinkage and the actual shrinkage, whether the demolding is smooth, the cooling effect, especially the impact of the position, size, and shape of the gate on product accuracy and shape, must be checked through trial molding. Therefore, trial molding is an indispensable step in verifying the qualification of the mold and selecting the forming process. Now let's talk about the maintenance and upkeep of plastic injection molding mold products. If our commonly used plastic products do not care about maintenance and upkeep, they can shorten their normal service life. Generally speaking, the following precautions should be taken during maintenance and upkeep: 1. Plastic injection processing enterprises should first equip record cards on each mold to record in detail the use, management (lubrication, cleaning, rust prevention), and damage situation, and make statistics. Therefore, it is possible to know which components, whether they are damaged, and the degree of wear and tear, in order to provide information and data for discovering and solving problems, the molding process parameters of the mold, and the purpose of the product.

2. Plastic injection molding enterprises should conduct various performance tests on the molds during normal operation of injection molding machines and molds, confirm the existing state of the molds, and measure the size of plastic parts in the molds to determine damage to voids, cores, cooling systems, parting surfaces, etc. Based on the information provided by plastic components, the damage status and maintenance measures of the mold can be determined.

Plastic injection processing

3. Attention should be paid to the surface management of plastic injection processing molds. Directly affecting the surface quality of the product is anti-corrosion. Therefore, selecting suitable and high-quality rust proof oil is particularly important. After completing the production work of the mold, different injection molding methods need to be used carefully to remove the remaining injection molding. Copper rods, copper wires, and mold cleaning agents can be used to remove the remaining injection and other deposits inside the mold, and then dried.

Prohibit the cleaning of hard objects such as iron wires and steel bars to prevent the surface from being scratched. If there is rust caused by corrosive dead stars, a grinder should be used to grind, polish, and spray rust proof oil, and then the mold should be stored in a dry, cool, and dust-free place.

Several important parts in plastic injection processing molds need to be tracked and inspected. The function of the ejection and guiding components is to ensure the opening and closing movement of the mold and the ejection of plastic components. If these parts are obstructed due to damage, production will be interrupted. Therefore, it is necessary to regularly maintain the lubrication of the mold ejector pins and guide pillars (choose appropriate lubricants), and regularly inspect the deformation and surface damage of the ejector pins and guide pillars