阅读说明：本技术 一种用于耐火砖模具表面的等离子堆焊方法 (Plasma surfacing method for refractory brick mold surface ) 是由 戴熠帆 章倩 于 2021-09-16 设计创作，主要内容包括：本发明提供一种用于耐火砖模具表面的等离子堆焊方法,包括以下步骤：(1)复配合金粉末；(2)模具表面预处理；(3)根据模具的形状及受力情况,机械手控制焊枪走向,在模具表面形成一层合金堆焊层；(4)对堆焊后的模具进行后期机加工。本发明用于耐火砖模具表面的等离子堆焊方法,等离子堆焊后的模具具有良好的内部组织结构,无缩孔、气泡、裂纹等缺陷；模具表面具有较强的韧性、强度、硬度和抗冲击性,大大提高了其使用寿命,并大大降低了生产成本。(The invention provides a plasma surfacing method for the surface of a refractory brick mould, which comprises the following steps: (1) compounding alloy powder; (2) pretreating the surface of the mold; (3) controlling the trend of a welding gun by a manipulator according to the shape and the stress condition of the die to form an alloy surfacing layer on the surface of the die; (4) and carrying out post machining on the die subjected to overlaying welding. The plasma surfacing method for the surface of the refractory brick mould, disclosed by the invention, has the advantages that the mould after plasma surfacing has a good internal structure and does not have the defects of shrinkage cavities, bubbles, cracks and the like; the surface of the die has stronger toughness, strength, hardness and impact resistance, the service life of the die is greatly prolonged, and the production cost is greatly reduced.)

1. A plasma surfacing method for the surface of a refractory brick mold is characterized by comprising the following steps: the method comprises the following steps:

(1) compounding alloy powder;

(2) pretreating the surface of the mold;

(3) controlling the trend of a welding gun by a manipulator according to the shape and the stress condition of the die to form an alloy surfacing layer on the surface of the die;

(4) and carrying out post machining on the die subjected to overlaying welding.

2. The plasma surfacing method for a refractory brick mold surface according to claim 1, wherein: the alloy powder comprises, by weight, 50-65% of tungsten carbide, 25-40% of nickel 60 self-fluxing alloy, 1.5-4.5% of ferrovanadium powder, 1.5-4.5% of ferromolybdenum powder, 0.5-2.0% of rare earth silicon powder and 0.3-2.0% of ferroniobium powder.

3. The plasma surfacing method for a refractory brick mold surface according to claim 1, wherein: the granularity of the alloy powder in the step (1) is 80-170 meshes.

4. The plasma surfacing method for a refractory brick mold surface according to claim 1, wherein: and (3) the pretreatment of the step (2) comprises the step of removing rust, oil stains and impurities on the surface of the die.

5. The plasma surfacing method for a refractory brick mold surface according to claim 1, wherein: the thickness of the overlaying layer in the step (2) is 2.5-5 mm.

6. The plasma surfacing method for a refractory brick mold surface according to claim 1, wherein: and (4) carrying out middle and later stage machining in the step (4) including later stage machining and mirror surface polishing on the part of the workpiece, the size or the surface precision of which does not meet the design requirement.

Technical Field

The invention relates to the field of manufacturing of surface functional coatings, in particular to a plasma surfacing method for the surface of a refractory brick mold.

Background

Plasma powder surfacing is a surfacing process which takes plasma arc as a heat source, rapidly heats alloy powder and the surface of a matrix by using high temperature generated by the plasma arc, melts, mixes, diffuses and solidifies the alloy powder and the matrix together, and carries out self-excited cooling after the plasma beam leaves to form a high-performance alloy layer, thereby realizing the strengthening and hardening of the surface of a part. The method is characterized in that: 1. the surfacing cladding alloy layer is metallurgically bonded with the workpiece substrate, and the bonding strength is high; 2. the surfacing cladding speed is high, and the dilution rate is low; 3. the build-up welding layer has compact structure and beautiful forming; 4. the plasma surfacing can be directly carried out on the surface of a rusted and greasy-stained metal part without a complex pretreatment process; 5. the surfacing process is easy to realize mechanization and automation; 6. compared with other plasma spray welding, the device has simple structure, energy saving, easy operation and easy maintenance.

The refractory brick mold has the disadvantages of severe working environment, poor toughness, low strength, small hardness, poor impact resistance and short service life of common molds, and the prior mold surface strengthening adopts a heat treatment mode mostly, but the treated mold still has the defects of cracks, air holes and the like, can not meet the high strength requirement and can not meet the mechanical processing performance of the mold.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides a plasma surfacing method for the surface of a refractory brick mold, so that the surface of the mold has stronger toughness, strength, hardness and impact resistance, and the service life of the mold is greatly prolonged. The technical scheme adopted by the invention is as follows:

a plasma surfacing method for a refractory brick mold surface, wherein: the method comprises the following steps:

(1) compounding alloy powder;

(2) pretreating the surface of the mold;

(3) controlling the trend of a welding gun by a manipulator according to the shape and the stress condition of the die to form an alloy surfacing layer on the surface of the die;

(4) and carrying out post machining on the die subjected to overlaying welding.

Preferably, the plasma surfacing method for the surface of the refractory brick mold comprises the following steps: the alloy powder comprises, by weight, 50-65% of tungsten carbide, 25-40% of nickel 60 self-fluxing alloy, 1.5-4.5% of ferrovanadium powder, 1.5-4.5% of ferromolybdenum powder, 0.5-2.0% of rare earth silicon powder and 0.3-2.0% of ferroniobium powder.

Preferably, the plasma surfacing method for the surface of the refractory brick mold comprises the following steps: the granularity of the alloy powder in the step (1) is 80-170 meshes.

Preferably, the plasma surfacing method for the surface of the refractory brick mold comprises the following steps: and (3) the pretreatment of the step (2) comprises the step of removing rust, oil stains and impurities on the surface of the die.

Preferably, the plasma surfacing method for the surface of the refractory brick mold comprises the following steps: the thickness of the overlaying layer in the step (2) is 2.5-5 mm.

Preferably, the plasma surfacing method for the surface of the refractory brick mold comprises the following steps: and (4) carrying out middle and later stage machining in the step (4) including later stage machining and mirror surface polishing on the part of the workpiece, the size or the surface precision of which does not meet the design requirement.

The invention has the advantages that:

the plasma surfacing method for the surface of the refractory brick mould, disclosed by the invention, has the advantages that the mould after plasma surfacing has a good internal structure and does not have the defects of shrinkage cavities, bubbles, cracks and the like; the surface of the die has stronger toughness, strength, hardness and impact resistance, the service life of the die is greatly prolonged, and the production cost is greatly reduced.

Detailed Description

The present invention will be further described with reference to the following specific examples.

Example 1

A plasma surfacing method for a refractory brick mold surface, wherein: the method comprises the following steps:

(1) and (3) pretreating the surface of the mold to remove rust, oil stains and impurities on the surface of the mold. Wherein, the rust removing mode can be that rust remover is used for removing rust, and sand blasting treatment can also be adopted;

(2) the composite alloy powder comprises 65 percent of spherical cast tungsten carbide, 30 percent of nickel 60 self-fluxing alloy, 3.0 percent of ferrovanadium powder, 1.0 percent of ferromolybdenum powder, 0.5 percent of rare earth silicon powder and 0.5 percent of ferroniobium powder in percentage by weight;

(3) controlling the trend of a welding gun by a manipulator according to the shape and the stress condition of the die, and carrying out plasma surfacing on the stress part of the die, wherein the traveling mode of the surfacing welding gun adopts a single-channel spiral operation mode, and the thickness of a surfacing layer is 3 mm;

(4) and (4) performing post-processing machine and mirror polishing on the part of the surfacing welded mold, the size and the shape of which or the surface precision of which do not meet the design requirements.

Through metallographic analysis, the surface toughness, strength, hardness and impact resistance of the die after surfacing are obviously improved, and the internal organization structure is compact without defects such as air holes, bubbles, cracks and the like.

Comparing the mold before surfacing with the mold after surfacing:

before surfacing of the die, the Hardness (HRC) is 60, and the impact resistance is general;

after the die is subjected to overlaying welding, the Hardness (HRC) is 73, the impact resistance is good, and the service life is prolonged by more than 9 times.

Example 2

A plasma surfacing method for a refractory brick mold surface, wherein: the method comprises the following steps:

(1) and (3) pretreating the surface of the mold to remove rust, oil stains and impurities on the surface of the mold. Wherein, the rust removing mode can be that rust remover is used for removing rust, and sand blasting treatment can also be adopted;

(2) the composite alloy powder comprises, by weight, 55% of spherical cast tungsten carbide, 35% of nickel 60 self-fluxing alloy, 3.0% of ferrovanadium powder, 4.0% of ferromolybdenum powder, 1.5% of rare earth silicon powder and 1.5% of ferroniobium powder;

(3) controlling the trend of a welding gun by a manipulator according to the shape and the stress condition of the die, and carrying out plasma surfacing on the stress part of the die, wherein the traveling mode of the surfacing welding gun adopts a single-path spiral operation mode, and the thickness of a surfacing layer is 5 mm;

(4) and (4) performing post-processing machine and mirror polishing on the part of the surfacing welded mold, the size and the shape of which or the surface precision of which do not meet the design requirements.

Through metallographic analysis, the surface toughness, strength, hardness and impact resistance of the die after surfacing are obviously improved, and the internal organization structure is compact without defects such as air holes, bubbles, cracks and the like.

Comparing the mold before surfacing with the mold after surfacing:

before surfacing of the die, the Hardness (HRC) is 60, and the impact resistance is general;

after the die is subjected to overlaying welding, the Hardness (HRC) is 71, the impact resistance is good, and the service life is prolonged by more than 7 times.

The plasma surfacing method for the surface of the refractory brick mould, disclosed by the invention, has the advantages that the mould after plasma surfacing has a good internal structure and does not have the defects of shrinkage cavities, bubbles, cracks and the like; the surface of the die has stronger toughness, strength, hardness and impact resistance, the service life of the die is greatly prolonged, and the production cost is greatly reduced.

Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.