阅读说明：本技术 一种利用3d打印制备模具材料的方法 (Method for preparing mold material by 3D printing ) 是由 孙海霞 郭志猛 张欣悦 杨芳 郝俊杰 邵艳茹 龙海明 于 2019-12-16 设计创作，主要内容包括：本发明公开了一种利用3D打印制备模具材料的方法,包括采用气雾化工艺制备原料粉末,原料粉末成分质量百分比：C为0.1%~0.5%、Cr为5%~6%、V为3%~10%、Mo为1%~2%,剩余量为Fe,粒度为-325目；将所需尺寸进行三维建模,同时由铺粉辊将所述原料粉末铺至3D打印平台,然后将模型切片处理,输入打印机,采用氮气气氛进行SLM打印,打印底板加热150℃,激光功率为70 W~130W,激光扫描速度为400 mm/s~600mm/s；打印结束后进行去应力退火,900℃固溶1h,530℃×3h炉冷,得模具材料。本发明工艺简单、晶粒细小、碳化物均匀,能够提高模具材料的强韧性和耐磨性。(The invention discloses a method for preparing a die material by 3D printing, which comprises the following steps of preparing raw material powder by adopting an air atomization process, wherein the raw material powder comprises the following components in percentage by mass: 0.1-0.5% of C, 5-6% of Cr, 3-10% of V, 1-2% of Mo, and the balance of Fe, wherein the granularity is-325 meshes; performing three-dimensional modeling on the required size, meanwhile, paving the raw material powder to a 3D printing platform by a powder paving roller, then slicing the model, inputting the sliced model into a printer, performing SLM printing by adopting nitrogen atmosphere, heating a printing bottom plate at 150 ℃, wherein the laser power is 70-130W, and the laser scanning speed is 400-600 mm/s; and after printing is finished, stress relief annealing is carried out, solid solution is carried out for 1h at 900 ℃, and furnace cooling is carried out for 3h at 530 ℃ to obtain the die material. The invention has simple process, fine crystal grains and uniform carbide, and can improve the toughness and the wear resistance of the die material.)

1. A method for preparing a mold material by using 3D printing is characterized by comprising the following steps:

a) preparing raw material powder by adopting an air atomization process, wherein the raw material powder comprises the following components in percentage by mass: 0.1-0.5% of C, 5-6% of Cr, 3-10% of V, 1-2% of Mo, and the balance of Fe, wherein the granularity is-325 meshes;

b) performing three-dimensional modeling on the required size, meanwhile, paving the raw material powder to a 3D printing platform by a powder paving roller, then slicing the model, inputting the sliced model into a printer, performing SLM printing by adopting nitrogen atmosphere, heating a printing bottom plate at 150 ℃, wherein the laser power is 70-130W, and the laser scanning speed is 400-600 mm/s;

c) and after printing is finished, stress relief annealing is carried out, solid solution is carried out for 1h at 900 ℃, and furnace cooling is carried out for 3h at 530 ℃ to obtain the die material.

2. The method for preparing a mold material by 3D printing according to claim 1, wherein in the step a), C is 0.1%, Cr is 5%, V is 6%, Mo is 1%, and the balance is Fe.

3. The method for preparing a mold material by 3D printing according to claim 1, wherein in the step a), C is 0.2%, Cr is 5.5%, V is 3%, Mo is 2%, and the balance is Fe.

4. The method for preparing a mold material by 3D printing according to claim 1, wherein in the step a), C is 0.5%, Cr is 6%, V is 10%, Mo is 1.5%, and the balance is Fe.

5. The method for preparing a mold material by 3D printing according to claim 1, wherein the laser power in step b) is 70W, and the laser scanning speed is 400 mm/s.

6. The method for preparing a mold material by 3D printing according to claim 1, wherein the laser power in step b) is 90W, and the laser scanning speed is 600 mm/s.

7. The method for preparing a mold material by 3D printing according to claim 1, wherein the laser power in step b) is 130W, and the laser scanning speed is 500 mm/s.

Technical Field

The invention relates to the technical field of molds, in particular to a method for preparing a mold material by utilizing 3D printing.

Background

The existing die material is mainly manufactured by adopting a casting-forging process, and the die material produced by adopting the casting process has serious segregation which is mainly shown as follows: the large-size die material has uneven grain distribution and large core grains due to different cooling rates of the core and the edge; coarse carbides are generated in the high alloy die material; in order to eliminate the segregation, a large amount of deformation and a plurality of passes of deformation processing are required, and therefore, the process is repeated and the requirement for controlling the forging process is high.

Disclosure of Invention

In view of the above, the invention is expected to provide a method for preparing a mold material by 3D printing, which has a simple process, fine crystal grains, uniform carbide, and can improve toughness and wear resistance of the mold material.

In order to achieve the above object, the present invention provides a method for preparing a mold material by 3D printing, comprising the steps of:

a) preparing raw material powder by adopting an air atomization process, wherein the raw material powder comprises the following components in percentage by mass: 0.1-0.5% of C, 5-6% of Cr, 3-10% of V, 1-2% of Mo, and the balance of Fe, wherein the granularity is-325 meshes;

b) performing three-dimensional modeling on the required size, meanwhile, paving the raw material powder to a 3D printing platform by a powder paving roller, then slicing the model, inputting the sliced model into a printer, performing SLM printing by adopting nitrogen atmosphere, heating a printing bottom plate at 150 ℃, wherein the laser power is 70-130W, and the laser scanning speed is 400-600 mm/s;

c) and after printing is finished, stress relief annealing is carried out, solid solution is carried out for 1h at 900 ℃, and furnace cooling is carried out for 3h at 530 ℃ to obtain the die material.

Preferably, in step a), C is 0.1%, Cr is 5%, V is 6%, Mo is 1%, and the balance is Fe.

Preferably, in step a), C is 0.2%, Cr is 5.5%, V is 3%, Mo is 2%, and the balance is Fe.

Preferably, in step a), C is 0.5%, Cr is 6%, V is 10%, Mo is 1.5%, and the balance is Fe.

Preferably, the laser power in step b) is 70W, and the laser scanning speed is 400 mm/s.

Preferably, the laser power in step b) is 90W, and the laser scanning speed is 600 mm/s.

Preferably, the laser power in step b) is 130W, and the laser scanning speed is 500 mm/s.

The invention has the following beneficial effects: the invention has simple process, fine crystal grains and uniform carbide, and can improve the toughness and the wear resistance of the die material.

Drawings

FIG. 1 is a microstructure diagram of a mold material obtained in example 3 of the present invention.

Detailed Description

So that the manner in which the features and aspects of the invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to embodiments, some of which are illustrated in the appended drawings.

The invention discloses a method for preparing a mold material by utilizing 3D printing, which comprises the following steps of:

a) preparing raw material powder by adopting an air atomization process, wherein the raw material powder comprises the following components in percentage by mass: 0.1-0.5% of C, 5-6% of Cr, 3-10% of V, 1-2% of Mo, and the balance of Fe, wherein the granularity is-325 meshes;

b) performing three-dimensional modeling on the required size, meanwhile, paving the raw material powder to a 3D printing platform by a powder paving roller, then slicing the model, inputting the sliced model into a printer, performing SLM printing by adopting nitrogen atmosphere, heating a printing bottom plate at 150 ℃, wherein the laser power is 70-130W, and the laser scanning speed is 400-600 mm/s;

the vanadium nitride can be generated by adopting nitrogen atmosphere printing, so that the wear resistance of the die material can be improved;

c) and after printing is finished, stress relief annealing is carried out, solid solution is carried out for 1h at 900 ℃, and furnace cooling is carried out for 3h at 530 ℃ to obtain the die material.

Preferably, in step a), C is 0.1%, Cr is 5%, V is 6%, Mo is 1%, and the balance is Fe.

Preferably, in step a), C is 0.2%, Cr is 5.5%, V is 3%, Mo is 2%, and the balance is Fe.

Preferably, in step a), C is 0.5%, Cr is 6%, V is 10%, Mo is 1.5%, and the balance is Fe.

Preferably, the laser power in step b) is 70W, and the laser scanning speed is 400 mm/s.

Preferably, the laser power in step b) is 90W, and the laser scanning speed is 600 mm/s.

Preferably, the laser power in step b) is 130W, and the laser scanning speed is 500 mm/s.

It is to be noted that the application of step a) of the present invention to 3D printing also allows the direct preparation of the mold.