Years of design practice in cold stamping molds have deeply impressed me with the importance of the structural rationality and usability of the design. Whether the mold can produce qualified workpieces and whether the newly developed product will be successful hinges on this. A set of mold, with a simple structure, may consist of just dozens of parts. However, we must never underestimate its significance.
At the initial design stage, the choice of mold structure is a topic worthy of in-depth discussion. Should we opt for the upright mold structure (where the die is mounted on the lower mold base) or the inverted mold structure (where the punch is mounted on the lower mold base)? Should we choose a single-process mold structure or a compound mold structure? There's much to delve into here.
When to Use Standard Molding Structures (Due to the relatively low precision requirements and the production of small batch parts, this is a common situation in many manufacturing enterprises. Therefore, only single-process molds without guiding devices will be discussed.) 1.1 Characteristics of Standard Molding Structures
The structural feature of the formal mold is that the die is mounted on the lower mold base. Therefore, whether it is the blanking or punching of the workpiece,
Other processes, workpieces, or waste materials can conveniently fall into the waste hole on the press bed. Therefore, when designing the mold, there is no need to consider the flow of workpieces or waste materials. Consequently, the designed mold structure is very simple and practical.
1.2 Advantages of the Formal Molding Structure
Due to the simple mold structure, the mold manufacturing cycle can be shortened, which is beneficial for the development and research of new products.
(2) Easy to use and maintain.
(3) Easier installation and adjustment of male and female mold gaps (compared to inverted molds). (4) Low mold manufacturing costs, beneficial for enhancing the company's economic benefits.
(5) Due to the constant presence of edge pressure throughout the stretching process, it is suitable for stretching non-rotary bodies (refer to Hardware Technology, 1997; 6: 42-44). 1.3 Drawbacks of the assembled mold structure.
Due to the accumulation of workpieces or scrap inside the die cavity, it has increased the minor expansion force within the die cavity.
Increase wall thickness to enhance **degree.**
(2) Due to the accumulation of workpieces or scrap material within the die cavity, it is generally necessary to machine a drop angle on the die blade. In some cases, the reverse face (material discharge hole) of the die blade also needs to be machined. This not only extends the mold production cycle but also increases the mold processing costs.
1.4 Selection Principles for the Mold Structure Assembly
In summary, the design principles we should adhere to when designing die molds are: prioritize the use of positive molds.
Structural integrity is essential. Other mold structures can only be considered when they meet the technical requirements of the workpiece under formal mold structures.
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