The Optimization Design and Manufacture of Hot Stamping Mold
In general, the structure of cold stamping die mainly includes the following several parts: upper die, lower die, blank holder ring, punch parts, die parts, all kinds of panel boards, all kinds of lifting lugs, directional plate, guide pins, guide column
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The Optimization Design and Manufacture of Hot Stamping Mold
10.1
The Key Technology of Hot Stamping Mold Design
10.1.1 The Whole Structure of Mold In general, the structure of cold stamping die mainly includes the following several parts: upper die, lower die, blank holder ring, punch parts, die parts, all kinds of panel boards, all kinds of lifting lugs, directional plate, guide pins, guide column sets, limit device, safety device, baffle plate, waste tank, variety of standard parts, etc. [6]. Cold stamping die is used only for parts forming, hot stamping tool not only for forming, but also for cooling quenching parts always with good mechanical properties and dimensional accuracy. So compared with the traditional cold stamping dies, the main characteristic of hot stamping die on the structure is the cooling system for cooling parts, and other aspects almost like cold stamping die, including the manufacturability of various parts and structural parts. Hot stamping die cooling system is composed of the external power system, mold internal cooling water circulation loop and connected with cooling pipes, etc. The internal cooling circuit design is the key and difficult point for hot stamping die design, also is the core technology of the hot stamping process. There are many ways of designing cooling water channel in the mold. According to all kinds of literature reports, there are three processing methods for hot stamping mold cooling pipe, mainly include casting, drilling, and inlaying [24] (Table 10.1). In addition, in the process of hot stamping, when put the steel blank with high temperature in the hot stamping mold, before stamping the area which blank in contact with the mold surface will cool quickly, and phase changes and harden rapidly, so that it can lead to local parts hardening and results in an uneven of forming group composition, huge parts internal thermal stress even causes cracking phenomenon in the forming process. Thus, hot stamping dies must be designed with special loading device to avoid the above potential problems [11]. © Science Press and Springer Science+Business Media Singapore 2017 P. Hu et al., Hot Stamping Advanced Manufacturing Technology of Lightweight Car Body, DOI 10.1007/978-981-10-2401-6_10
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10 The Optimization Design and Manufacture of Hot Stamping Mold
Table 10.1 The manufacturing methods of cooling channels Casting
Advantage: cooling uniformity, good sealing, high-mold intensity Disadvantages: difficult to machining, the cooling effect is not good, and is not convenient to maintain
Drilling
Advantages: good cooling effect, easy processing, good sealing, convenient repair Disadvantages: lack of uniform for curved surface cooling
Inlaying
Advantages: good cooling effect, uniform cooling Disadvantages: poor sealing, low mold strength
10.1.2 The Selection of Material In the process of high strength plate hot stamping, plate through upper austenitizing temperature falls down to room temperature. So when choosing mold materials of hot stamping die we should pay mor
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