How to select injection moulds

What characterizes a good ,high-production mould ?

1. Concept and design: YongMing design team always take high productivity and lowest cost product in mind. To spent much time on the mould concept before starting the actual design, or beginning to cut steel.

2.runner system :much thought is given to decide on the most suitable runner system ,the gating, cooling, and ejection of the products.

3. Hot runner servicing : adopt famous brand hot runner, after sale service could be accessible in local place.

4. Strength of supports

Support plates are adequately heavy and sufficient supports are provided under the cavities and cores to ensure minimum deflection of the plates under load by clamping and during injection, thus guaranteeing quality products.

5.  Mold steel selection

According product material capacity,mold steel selection is appropriate for the expected life and performance of the mold and often, the best quality steels and other materials are selected, without too much concern about the added cost. (After all, with large production runs, the additional cost per molded piece is

6. Mold standard component

Make full use of standard components, before starting the actual design, careful consideration is given to select the best quality of (purchased) mold components to ensure trouble-free operation.

using standard component not only save mould manufacturing time also could be easy accessible for standard component replace in local place.

7. Mold alignment

Alignment feature (leader pins, tapers). Long, especially unsupported leader pins are heavy to ensure minimum deflection. They are long enough to protect the exposed cores from damage. Tapers for alignment are sized proportional to the length of the core.

8. Tapers

 Alignment tapers are properly engineered, with specified amounts of preload, to ensure holding

the matching parts in alignment securely.

9. Mold cooling

Cooling channels are carefully planned for optimal size and location to provide maximum cooling

efficiency and ensure highest productivity. Cross drilling of the plates (which is possible because they are thick enough) simplifies the installation of the mold and improves the accessibility of the mold for servicing during startup.

10. Moving plates

Moving plates, such as ejector plates, are properly guided and supported to minimize wear of delicate pins, etc. Proper, often automatic, lubrication of wear points is provided.

11. Mold mounting

Mounting the mold to the machine is considered from the beginning and the most suitable

mounting methods are provided.

12. Testing of mold

The mold is thoroughly tested at the mold maker, not just for product sizes and fits but also for

productivity of the mold, before delivery.

13. Cost of extras

Cost of extras are included in the mold price.

These extras consist of all necessary standard component to store, install, start up and run the mold. To have these costs included makes it possible to compare fairly all potential vendors . normally the spare parts itself cost account 5% of the mould total cost,

The following list shows some but not necessarily all of these items: (Note that when requesting a quotation, it is good practice to request that any such foreseen item or feature is included in the quotation)

Materials used for construction

. Coatings and finishing including plating  (molding surfaces)

. Pipe fittings and hoses

. Electrical cables

. Mold feet, latches, and lift bars

. Suggested spare parts

. Cost of re-cuts

. Cost of re-tests

. Guarantees on product size

. Expected productivity

14. All of the mould ordered from YongMing company is supplied with a “Mold Manual”, which documents all that is to be known about the mold and its accessories and vendor’s products. It includes mold drawings, test reports, safety tips, and mold maintenance and trouble shooting instructions.