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Method for preparing coated metal/ceramic/molding sand powder
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A powder and metal technology, applied in the field of additive manufacturing of 3D printing materials, can solve problems such as low production efficiency and complicated preparation process, and achieve good wrapping effect and mature and stable process
Inactive Publication Date: 2019-08-20
深圳市畅形增材科技有限公司
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Problems solved by technology
[0002] The existing SLS selective lasersinteringcoating metal / ceramic / sand powder preparation process is complicated, usually mainly by solvent precipitation method or the method of diluting and stirring the hot meltadhesive with a diluent to prepare, in which the solvent precipitation method needs to add a mixed solvent, Prepare a suspension of binder-coated metal / ceramic / casting sand powder. After vacuum distillation, solid-liquid separation, the solid powder is vacuum-dried, ball milled and sieved to obtain coated metal / ceramic / casting sand powder, and the suspension preparation process Especially complex, and therefore inefficient production of coated metal / ceramic / sand powders for SLS selective lasersintering
Method used
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[0025] see figure 1 , a method for preparing film-coated metal / ceramic / casting sand powder, comprising:
[0026] S1. Mixing and granulating metal / ceramic / casting sand powder and binder to obtain mixed granules. In this step, use a special kneader / granulator for PIM (powder injection molding) The metal / ceramic / sand powder of the film is mixed and granulated. The mixer / granulator includes but not limited to the double crankshaft strong mixer and the supporting granulator, or the compound mixing and granulationmachine , in which, in order to adapt to different formulations of binders, the temperature of banburying is also different;
[0027] S2. Crushing and pulverizing the kneaded particles to obtain coated metal / ceramic / casting sand powder.
[0028] In step S1, this embodiment uses the parameters of the plastic-based binder formula. First, preheat the internal mixer to 180-185°C. When the temperature reaches the preset temperature, pour the powder to be processed into the in...
Embodiment 1
[0039] In step S21, the kneaded particles are subjected to jet pulverization treatment at an air pressure of 0.3-1.2 MPa.
[0040] In this embodiment, an air pressure of 0.3-1.2 MPa is used for air injection, and the air flow can effectively drive the kneading particles to collide with each other or make the particles collide with the cavity wall, thereby being crushed into coarsely ground powder.
Embodiment 2
[0042] In step S3, in step S23, the kneaded particles are subjected to air-jet fine grinding treatment at an air pressure of 0.2-0.8 MPa.
[0043] In this embodiment, a lower air pressure of 0.2-0.8 MPa is used for air injection, which can prolong the residence time of the coarsely ground powder in the crushing chamber, blunt the edges and corners of the powder, and obtain a nearly spherical powder. Such a coated powder Good fluidity and good powder spreading effect.
[0044] When the powder is ground to a certain extent and the quality becomes lighter, the powder is collected from the upper outlet in the middle of the crushing chamber along with the gas, and the finely ground powder is obtained.
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Abstract
The present invention provides a method for preparing coated metal / ceramic / molding sandpowder, comprising: S1, mixing metal / ceramic / molding sandpowder with a binder and then prilling, to obtain mixed particles; and S2, crushing and pulverizing the mixed particles to obtain the coated metal / ceramic / molding sandpowder. The present invention has the beneficial effects of providing a method for preparing coated metal / ceramic / molding sand powder which can be realized without adding a mixed solvent, the method is mature and stable, and the coated metal / ceramic / molding sand powder is wrapped perfectly after pulverization, thus the method is especially suitable for mass production, and the manufactured coated metal / ceramic / molding sand powder is suitable for SLS selective laser sintering to manufacture indirect metal / ceramic / molding sand 3D printing parts.
Description
technical field [0001] The invention relates to the technical field of additive manufacturing of 3D printing materials, in particular to a preparation method of coated metal / ceramic / casting sand powder. Background technique [0002] The existing SLS selective laser sinteringcoating metal / ceramic / sand powder preparation process is complicated, usually mainly by solventprecipitation method or the method of diluting and stirring the hot meltadhesive with a diluent to prepare, in which the solventprecipitation method needs to add a mixed solvent, Prepare a suspension of binder-coated metal / ceramic / casting sand powder. After vacuum distillation, solid-liquid separation, the solid powder is vacuum-dried, ball milled and sieved to obtain coated metal / ceramic / casting sand powder, and the suspension preparation process Especially complex, and therefore inefficient production of coated metal / ceramic / sand powders for SLS selective laser sintering. [0003] Therefore, it is necessa...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information
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