Non-pre-buried type abnormal-shaped bent water channel hot-work die and manufacturing method of non-pre-buried type abnormal-shaped bent water channel hot-work die

Abstract

The invention discloses a non-pre-buried type abnormal-shaped bent water channel hot-work die and a manufacturing method of the non-pre-buried type abnormal-shaped bent water channel hot-work die. The manufacturing method is characterized in that casting-state die workblank manufacturing is achieved by combining a ceramic core or a 3D printing core with a traditional sand casting method, and includes the steps of die workblank manufacturing, casting-state die workblank coarse machining and casting-state die workblank finish machining. The die workblank manufacturing includes the steps of manufacturing a cavity, an abnormal-shaped bent water channel core and a casting system, assembling the die, smelting steel, carrying out rapid casting, and carrying out cleaning, shot blasting, annealing, post-processing and flaw detection on the abnormal-shaped bent water channel core and a water collecting groove inlet-and-outlet core. The casting-state die workblank coarse machining includes the steps of casting-state die workblank profile coarse machining, quenching and tempering. The casting-state die workblank finish machining includes the steps of casting-state die workblank profile finish machining, casting-state die workblank matching face finish machining and profile PVD plating. The non-pre-buried type abnormal-shaped bent water channel hot-work die and the manufacturing method of the non-pre-buried type abnormal-shaped bent water channel hot-work die solve the problems that an abnormal-shaped bent water channel with optimized values cannot be achieved through a traditional mechanical drilling manner and the cooling rate of the traditional mechanical drilling manner is uneven, and have the advantages that the profile temperature is even, and the die machining cost is reduced.

Description

Technical field [0001] The invention relates to the field of metal material forming, in particular to a non-embedded special-shaped curved waterway hot working die and a manufacturing method thereof. Background technique [0002] At present, hot work molds containing special-shaped curved cooling water channel systems can be used in industries such as automobiles, rail vehicles, ships, machinery industry, and construction, especially in the automotive industry, where there are many applications. Due to the increasingly serious environmental pollution and the increasingly scarce resources, the promotion of light weight in the above industries has become an inevitable trend of scientific and technological development, so high-strength steel plates and magnesium aluminum alloys are used in large quantities. Warm forming is the most suitable method for forming high-strength steel sheets and magnesium-aluminum alloys. This requirement includes good thermomechanical properties, high w...

AI Technical Summary

Problems solved by technology

The mechanical drilling method cannot process the curved water channel to adapt to the complex surface mold. At the same time, due to the limitation of the machining depth, the mold must be divided into many inserts, which makes it difficult to seal between the inserts, reduces the fluidity of the coolant, and is easy to press during the stamping process. A gap is generated, which seriously affects the quality of hot stamping parts

The straight water channel will also make the mold cooling uneven, affect the in-mold quenching quality of hot stamping parts, affect the strength and life of the mold, and also affect the production efficiency of hot stamping parts

Jilin University (Zhu Chao. Design and optimization of hot stamping dies for ultra-high-strength steel plates [D]. Jilin University: School of Materials Science and Engineering, 2010, 5; A method of manufacturing hot-forming dies for automotive high-strength steel stamping parts [P] .China, Invention Patent, CN102179499A, 2011.09.14) and Harbin Institute of Technology (Wang Hongguang. Research on Cooling Effect of Mixed Cooling System for Thermoforming Mold [D]. Harbin Institute of Technology: School of Mechanical and Electrical Engineering, 2011, 6; Li Lintao. Automobile Research on bumper thermoforming mold and its embedded cooling system [D]. Harbin Institute of Technology: School of Mechanical and Electrical Engineering, 2010, 6) The researched rigid water pipe embedded casting method can also obtain hot stamping with conformal curved cooling channels inside However, the rigid water pipe is difficult to bend, the process is complicated, the precision is not high, the cross section is almost limited to a circle, and the rigid water pipe is difficult to fuse with the casting base material to form an air gap during casting, and it cannot be processed after cooling. Clearing, significantly affects the cooling function of the mold, and according to the relevant literature (Q.Bai.An efficient closed-form method for determining interfacial heat transfer coefficient in metal forming, International Journal of Machine Tools&Manufacture56(2012)102-110) reports, sheet metal and The heat transfer of the mold is related to the pressure it bears. When the mold surface is complex, it is not possible to ensure uniform temperature of the mold surface by adopting the method of manufacturing the water channel according to the shape, but must press non-equidistant transition distribution or adopt mutual influence Shaped channel

In addition, Tianjin Vocational and Technical Normal University's invention patent (a high-strength steel plate hot stamping die manufacturing method [P]. China, invention patent, CN102744328A, 2012.10.24) studied a manufacturing method of a hot stamping die with a conformal water channel , its technical characteristics cannot be applied to molds with complex profiles and curved and cross-shaped water channels; secondly, tailor-welded processing of follow-up water channels will lead to difficulties in processing the outer surface, and a certain gap between the water channels and the mold wall will cause great heat dissipation for the mold big impact

Furthermore, the method of fastening the split parts of the male and female dies with bolts is prone to loosening when subjected to continuous impact loads, causing damage to the dies

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