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Numerical simulation method for superfine cemented carbide step round bar PIM (Powder Injection Molding) mold filling process

A cemented carbide and numerical simulation technology, which is applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as numerical simulation of ultra-fine hard alloys that have not been seen, and achieve improved PIM technology, improved convergence, Optimizing the effectiveness of binder formulations

Active Publication Date: 2017-05-24
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no relevant report on the numerical simulation of the filling process of ultrafine cemented carbide injection molding.

Method used

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  • Numerical simulation method for superfine cemented carbide step round bar PIM (Powder Injection Molding) mold filling process
  • Numerical simulation method for superfine cemented carbide step round bar PIM (Powder Injection Molding) mold filling process
  • Numerical simulation method for superfine cemented carbide step round bar PIM (Powder Injection Molding) mold filling process

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Embodiment Construction

[0040] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0041] Taking the numerical simulation of the ultrafine WC / 10Co cemented carbide PIM mold filling process as an example, a numerical simulation method of the ultrafine cemented carbide stepped round rod PIM mold filling process of the present invention is illustrated. Specifically follow the steps below:

[0042] 1) Establish the finite element model: a) Simplify the model of the stepped round bar, take the actual gate of the mold cavity as the filling inlet, and take the far end of the gate as the filling outlet, and use the three-dimensional drawing software UG NX5.0 to establish the mold cavity The three-dimensional geometric model of the stepped round bar, which is a single-sided outlet model, s...

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Abstract

The invention relates to a numerical simulation method for a superfine cemented carbide step round bar PIM (Powder Injection Molding) mold filling process. Through equivalent powder, a multi-fluid model, the optimization of fluid inlets and outlets, the refining of a mesh model and the reasonable setting of the mutual function of a fluid pair, the astringency of a simulation process is effectively improved, the problem that calculation is likely to be divergent due to the big density difference, the big viscosity difference, small interface interaction depth and the like of binder and powder can be overcome, the visualization of a feeding melt mold filling flowing process is realized, mold filling characteristics, including respective speed, temperature and viscosity physical field distribution, of the powder and the binder can be effectively mastered, a binder formula is optimized, and a critical powder loading amount is determined so as to improve the PIM technology of the superfine cemented carbide. The method can be used for investigating defects including bubbles, defects and the like in a mold filling process, a root for generating segregation and the influence factor of the root are analyzed, defect generation information, including cracks, air holes, weld bonds and the like, can be predicted, and useful information is provided for analyzing superfine cemented carbide PIM technological conditions and feeding properties, guiding technological parameters and mold design.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy near-net forming, and in particular relates to a numerical simulation method for a PIM mold filling process of an ultrafine hard alloy stepped round rod. Background technique [0002] Ultra-fine grained WC-Co cemented carbide, due to its high strength, high hardness and high wear resistance, is widely used in tools, molds and wear-resistant parts, including metal cutting tools, wire drawing and stamping forming dies, sealing rings, nozzles, etc. Many areas. [0003] Ultra-fine cemented carbide powder injection molding (PIM) can not only obtain high-strength, high-hardness and high-wear-resistant alloys, but also prepare near-net-shaped products with complex shapes, which has advantages unmatched by conventional powder metallurgy and machining methods. Advantage. [0004] The mold filling process of powder injection molding is a non-isothermal and unsteady complex flow of non-Newtonian ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 谢兴铖曹瑞军林中坤林晨光李忠武
Owner GRIMAT ENG INST CO LTD
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