Summary

Most of the cooling channels are made of conventional molds that adopt the drilling approach and use the baffle / bubbler or spiral type in the deeper portion; however, it is difficult to place due to the complex structure of the product. If the heat accumulation area is larger, the cooling time needs to be extended and the excessive temperature difference between the core and cavity can easily cause the product warpage. The Grand Dynasty team successfully solve the warpage issue in the power inspection socket product by using Moldex3D to simulate the creation of a conformal cooling channel mold before manufacturing. This led to a reduction in molding cycle time and the discovery of excellent design conformal cooling channel mold before manufacturing. In this study case, the warpage was improved by 49%, and the production efficiency was enhanced by 25%.

Challenges

• The assembly parts are difficult to assemble due to interference.
• Improve the warpage issue of the product to achieve smooth mass production.

Solutions

Through the Moldex3D cooling analysis, we identified the issue of uneven temperature distribution between the core and cavity molds. The temperature difference of 47°C between the core and cavity molds of Part B caused the partial area of Part B to be concave, which resulted in the interference and looseness issue when assembling with parts A and C. Based on the conformal cooling channel technology. Modify the channel configuration to reduce the temperature difference between the core and cavity molds while also improving the warpage. The resulting optimized design was sent to 3D metal printing for mold production. As a result, the warpage was reduced by 49% and the molding cycle was decreased by 25%.

Benefits

• Effectively control the product size and improve the gap and looseness issue in assembled products.
• Reduce cooling time by 25% and increase the production capacity by ¼.

Case Study

There are increasingly more plastic parts used in the automotive industry, and the power inspection base is the main subject of this case. The power inspection base is composed of 3 plastic parts, as shown in Figure 1. Parts B and C are difficult to assemble due to interference, and it is easy for part B to loosen when combined with part A, as shown in Figure 2. The above-mentioned problems will result in poor quality and hinder smooth mass production.

Fig. 1 The power inspection base and 3 plastic parts

Fig. 2 Poor quality due to component assembly problems

In order to improve these issues, Grand Dynasty Industrial utilized Moldex3D to analyze the root causes and determine the optimal cooling channel design. Figure 3 displays the component model geometry and cooling channel designs, both the original and optimized versions.

Upon comparing the cooling results of the traditional and the conformal cooling channel (as shown in Table 1), it was found that the conformal cooling channel design yields better cooling efficiency and shorter ejection time compared to the original design. Further observation of the warpage deformation results (Table 2) also shows that the conformal cooling channel design can greatly optimize the warpage.

Fig 3 (a) Component model geometry and cooling channel design: (b) Original (c) Optimized.

Table 1 Cooling results of traditional and conformal cooling channels

Table 2 CAE warpage results and improving efficiency

After completing the 3D metal printing mold core, practical injection molding verification was carried out. It was confirmed that the conformal cooling channel design effectively reduces mold temperature through infrared thermal imaging. Additionally, the warpage deformation was obtained by using the 2.5D projection measurement method. The measurement results showed that the relevant dimensions have been improved, with an improvement range of 25% to 50% (Table 3).

This improvement makes the subsequent assembly of parts B and C without interference and also makes the assembly of parts B and A not easy to loosen (Figure 4, 5), and the cooling time of actual production is also improved by 14% From the above results, it clear that the conformal cooling channel can effectively shorten the molding cycle and improve the warpage deformation problem.

Table 3 On-site warpage results and improvement percentage.

Fig 4 Part B has good flatness and will not interfere with part C.

Fig 5. The assembly of parts B and A will not loosen and can be tightly connected.

Results

Grand Dynasty Industry successfully resolved the issue of uneven mold temperature distribution, especially the inconsistent temperature distribution between the core and cavity, through Moldex3D cooling analysis. In the process of designing cooling channel configurations, multiple cooling analysis scenarios were used to find the design with the smallest temperature difference between the core and cavity. This correct design solution was provided to 3D metal printing for mold manufacturing, greatly improving the warpage deformation problem.

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