CN109590637B - Pre-forming brazing coating material for rotary blade - Google Patents
Pre-forming brazing coating material for rotary blade Download PDFInfo
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- CN109590637B CN109590637B CN201811525203.7A CN201811525203A CN109590637B CN 109590637 B CN109590637 B CN 109590637B CN 201811525203 A CN201811525203 A CN 201811525203A CN 109590637 B CN109590637 B CN 109590637B
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- brazing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3033—Ni as the principal constituent
Abstract
The invention provides a preformed brazing material for a rotary blade, which is coated on the edge part of the rotary blade to form a cutter sleeve with a U-shaped section, wherein the inner cavity of the cutter sleeve is matched with the edge part of the rotary blade, and the brazing material is prepared from the following raw materials: the preparation method of the brazing coating material comprises the following steps: A. weighing tungsten carbide powder, brazing flux type binder, toughening agent and nickel-based brazing filler metal powder according to the mass parts, putting the tungsten carbide powder, the brazing flux type binder, the toughening agent and the nickel-based brazing filler metal powder into a container, mixing, stirring and kneading to obtain an elastic powder mass with certain bonding strength; B. placing the elastic powder dough obtained in the step A in a mould, and carrying out cold pressing to obtain a blank matched with the working surface of the rotary blade; C. the blank is placed into an oven for drying and cooling to prepare the preformed brazing coating material, the invention is suitable for the brazing coating of the rotary tillage cutter, is matched with the heating in the oven, can realize the positioning, temperature setting, timing and quantitative high-efficiency brazing coating, and can effectively avoid the waste of the brazing coating material and improve the work efficiency.
Description
Technical Field
The invention relates to a brazing coating material, in particular to a preformed brazing coating material for a rotary blade.
Background
With the development of agriculture, especially mechanization of agricultural production, the requirement on the wear resistance of agricultural machinery accessories is higher and higher. The rotary blade is the main wearing part of the rotary cultivator, and the wear and the replacement of the rotary blade cause great loss every year. Therefore, the surface technology is of great significance for preparing the wear-resistant coating on the surface of the rotary blade.
At present, the surface technology is less applied to the preparation of wear-resistant coatings on the working surfaces of rotary tillage cutters, but the surface technology is widely applied to the preparation of wear-resistant coatings on the working surfaces of some parts. Common surface techniques are physical vapor deposition, chemical vapor deposition, thermal spray, build-up, and recently developed braze processes. The wear resistant layers obtained by the first methods are limited in thickness, while the brazing method can obtain coatings with a wide range of thicknesses. In addition, the brazing method has the advantages of simple equipment and higher process flexibility, and can prepare a surface functional coating with excellent properties such as wear resistance, corrosion resistance and the like on the surface of a workpiece at lower cost.
Braze coating is essentially a special braze, unlike conventional brazes where the braze coating material consists of two parts: one part is a common solder alloy, which has a relatively low melting temperature and is known as a low melting point component; the other part is a hard alloy with a high melting point, which is called a high melting point component. In theory any brazing filler metal can constitute the low melting component of the braze coating material. However, as the wear-resistant layer, the brazing filler metal itself is required to have a certain hardness and be soft. Currently, nickel-based solders are commonly used. The nickel-based brazing filler metal is hard and brittle and has poor processability, and is difficult to be processed into coiled wire-shaped or strip-shaped brazing filler metal. The conventional method is to prepare the nickel-based brazing filler metal into powder brazing filler metal, then prepare the powder brazing filler metal and hard alloy particles, a binder, organic matters and the like into suspended slurry or a strip-shaped brazing coating material, and coat or adhere the slurry or the strip-shaped brazing coating material on the surface of a workpiece. The problems that quantitative coating cannot be carried out and working hours and materials are wasted exist when the rotary blade is coated by the traditional slurry or strip-shaped brazing material, and efficient brazing of positioning, temperature setting, timing and quantification of the rotary blade is difficult to realize. In addition, the traditional pasty or strip brazing coating material contains organic adhesive, so that harmful gas and residues are easily generated in the brazing coating process, and the environment is polluted; therefore, there is a need for an efficient and environmentally friendly brazing material for rotary blades.
Disclosure of Invention
The invention aims to overcome the defects of the existing brazing coating material, and provides the high-efficiency brazing coating material for the rotary blade, which is suitable for brazing coating of the rotary blade, can realize positioning, temperature setting, timing and quantitative high-efficiency brazing coating by matching with heating in a furnace, and can effectively avoid the waste of the brazing coating material and improve the working efficiency; in addition, the binder in the brazing coating material is a brazing flux binder, the main component is a brazing flux flow aid borax, the organic binder is not contained, and the brazing coating material has the advantages of no carbon residue, no toxic smoke and strong environmental friendliness in the brazing coating process.
The technical scheme adopted by the invention for solving the technical problems is as follows: a preformed brazing material for a rotary blade is coated on the edge of the rotary blade to form a cutter sleeve with a U-shaped section, the inner cavity of the cutter sleeve is matched with the edge of the rotary blade, and the preformed brazing material is prepared from the following components in parts by mass: 30-50 parts of tungsten carbide powder, 1-5 parts of brazing flux binder, 0.1-1 part of toughening agent and 45-75 parts of nickel-based brazing filler powder.
Further, the tungsten carbide powder is composed of 40-60-mesh tungsten carbide powder and 160-200-mesh tungsten carbide powder in a mass ratio of 1: 5-1: 2.
Further, the braze-flux type binder is prepared from the following components in a mass ratio of 3: 1-2: 1, the preparation method of the soldering flux type binder comprises the following steps: 1) according to the weight percentage of borax: the water content is 3: 1-2: 1, adding the weighed water into the weighed borax while stirring until the borax is completely dissolved, and then continuously stirring for 3-5 min to form uniform pasty liquid; 2) and putting the pasty liquid prepared in the step 1) into a ceramic tank of a planetary ball mill for grinding to obtain the soldering flux type binder.
Furthermore, the grinding speed of the planetary ball mill is 40-50 r/min, and the grinding time is 45-60 min.
Further, the toughening agent is hollow polyester fiber.
A preparation method of a preformed brazing coating material for a rotary blade comprises the following steps:
A. weighing 30-50 parts of tungsten carbide powder, 1-5 parts of brazing flux type binder, 0.1-1 part of flexibilizer and 45-75 parts of nickel-based brazing filler metal powder according to parts by mass, and putting into a container for mixing, stirring and kneading to obtain an elastic powder mass with certain bonding strength;
B. placing the elastic powder dough obtained in the step A in a mould, and carrying out cold pressing to obtain a blank matched with the working surface of the rotary blade;
C. and (3) putting the blank into an oven for drying and cooling to prepare the preformed brazing coating material.
Further, the die cavity in the step B is matched with the working surface of the rotary blade.
And further, in the step C, heating the blank in an oven at 0.5-2 ℃/min to 230-250 ℃, preserving heat for 1.5-2.0 h, and then cooling the blank to room temperature along with the oven.
The beneficial effects of the invention are mainly expressed as follows:
1. compared with the traditional brazing coating material, the invention is suitable for the brazing coating of the rotary tillage cutter, is matched with heating in a furnace, can realize positioning, temperature setting, timing and quantitative high-efficiency brazing coating, can effectively avoid the waste of the brazing coating material and improve the working efficiency.
2. The invention does not contain organic adhesive, has high brazing reliability, does not discharge harmful gas and residual carbon in the brazing process, is green and environment-friendly, and is beneficial to protecting the health of workers and preventing environmental pollution.
Drawings
FIG. 1 is a schematic structural view of a preformed braze-coated material according to the invention;
FIG. 2 is a schematic view of the assembly of the rotary blade of the present invention with a preformed braze-coating material.
Detailed Description
The present invention is described in detail with reference to the following examples, which are provided for the purpose of explaining the technical solutions of the present invention and describing the detailed embodiments and the specific operation procedures, but the scope of the present invention is not limited to the following examples.
Example one
The preformed brazing material for the rotary blade is coated on the edge of the rotary blade to form a cutter sleeve with a U-shaped section, an inner cavity of the cutter sleeve is matched with the edge of the rotary blade, and the preformed brazing material is prepared from the following components in parts by mass: 30-50 parts of tungsten carbide powder, 1-5 parts of brazing flux binder, 0.1-1 part of toughening agent and 45-75 parts of nickel-based brazing filler powder.
Further, the tungsten carbide powder is composed of 40-60-mesh tungsten carbide powder and 160-200-mesh tungsten carbide powder in a mass ratio of 1: 5-1: 2.
Further, the braze-flux type binder is prepared from the following components in a mass ratio of 3: 1-2: 1, the preparation method of the soldering flux type binder comprises the following steps: 1) according to the weight percentage of borax: the water content is 3: 1-2: 1, adding the weighed water into the weighed borax while stirring until the borax is completely dissolved, and then continuously stirring for 3-5 min to form uniform pasty liquid; 2) and putting the pasty liquid prepared in the step 1) into a ceramic tank of a planetary ball mill for grinding to obtain the soldering flux type binder. The main components of the brazing flux type binder are borax and water, and the borax plays a role of a soldering flux due to the fact that the borax is a brazing flux, so that the brazing flux type binder not only plays a role in flow aid and protection, but also does not have carbon residue and toxic gas emission in the brazing coating process.
The molecular formula of borax is Na2B4O7.10H2O, which in water can form with hydroxyl, aldehyde group, etc. of gelatinized oxidized starch, [ B4O7］2-The ion-centered network structure has the functions of crosslinking and tackifying. Therefore, the special chemical structure characteristics of borax determine that the borax can be used as a binder under certain conditions.
Furthermore, the grinding speed of the planetary ball mill is 40-50 r/min, and the grinding time is 45-60 min.
Further, the toughening agent is hollow polyester fiber.
A preparation method of a preformed brazing coating material for a rotary blade comprises the following steps:
A. weighing 30-50 parts of tungsten carbide powder, 1-5 parts of brazing flux type binder, 0.1-1 part of flexibilizer and 45-75 parts of nickel-based brazing filler metal powder according to parts by mass, and putting into a container for mixing, stirring and kneading to obtain an elastic powder mass with certain bonding strength;
B. placing the elastic powder dough obtained in the step A in a mould, and carrying out cold pressing to obtain a blank matched with the working surface of the rotary blade;
C. and (3) putting the blank into an oven for drying and cooling to prepare a preformed brazing coating material, wherein the thickness of the brazing coating material layer is 0.3-0.8 mm.
Further, the die cavity in the step B is matched with the working surface of the rotary blade.
And further, in the step C, heating the blank in an oven at 0.5-2 ℃/min to 230-250 ℃, preserving heat for 1.5-2.0 h, and then cooling the blank to room temperature along with the oven.
Example two
A. The preformed brazing coating material is prepared from the following components in parts by mass: 25 parts of tungsten carbide powder, 1 part of brazing flux type binder, 0.1 part of toughening agent and 73.9 parts of nickel-based brazing filler powder; wherein the braze-flux type binder is prepared from the following components in percentage by mass of 2: 1, borax and water;
B. the preparation method of the braze-type binder comprises the following steps: 1) according to the weight percentage of borax: the water content is 2: 1, adding the weighed water into the weighed borax while stirring until the borax is completely dissolved, and stirring for 3-5 min to form uniform pasty liquid; 2) putting the pasty liquid prepared in the step 1) into a ceramic tank of a planetary ball mill for grinding, wherein the grinding speed of the planetary ball mill is 45r/min, and the grinding time is 45-60 min, so as to obtain a soldering flux type binder;
C. weighing 35 parts of tungsten carbide powder, 1 part of brazing flux type binder, 0.1 part of flexibilizer and 73.9 parts of nickel-based brazing filler metal powder according to the mass parts, and putting the materials into a container for mixing, stirring and kneading to obtain elastic powder balls with certain bonding strength;
D. placing the elastic powder dough in a die and cold-pressing to obtain a blank matched with the working surface of the rotary blade;
E. and (3) putting the blank into an oven for drying and cooling to prepare the preformed brazing coating material.
The water is distilled water or purified water.
The toughening agent is hollow polyester fiber.
The shape and the size of the cold pressing die cavity are matched with those of the rotary blade.
The procedure of example 3 to example 8 was the same as that of example 2 except that the procedure of step A was different.
Example 3
A. The preformed brazing coating material is prepared from the following components in parts by mass: 30 parts of tungsten carbide powder, 1.5 parts of brazing flux type binder, 0.3 part of toughening agent and 68.2 parts of nickel-based brazing filler powder; wherein the braze-flux type binder is prepared from the following components in a mass ratio of 2.5: 1 borax and water.
Example 4
A. The preformed brazing coating material is prepared from the following components in parts by mass: 35 parts of tungsten carbide powder, 2 parts of brazing flux type binder, 0.5 part of toughening agent and 62.5 parts of nickel-based brazing filler powder; wherein the braze-flux type binder is prepared from the following components in a mass ratio of 2.5: 1 borax and water.
Example 5
A. The preformed brazing coating material is prepared from the following components in parts by mass: 40 parts of tungsten carbide powder, 2.5 parts of brazing flux type binder, 0.6 part of toughening agent and 56.9 parts of nickel-based brazing filler powder; wherein the braze-flux type binder is prepared from the following components in percentage by mass of 3: 1 borax and water.
Example 6
A. The preformed brazing coating material is prepared from the following components in parts by mass: 45 parts of tungsten carbide powder, 3 parts of brazing flux type binder, 0.8 part of toughening agent and 51.2 parts of nickel-based brazing filler powder; wherein the braze-flux type binder is prepared from the following components in a mass ratio of 2.5: 1 borax and water.
Example 7
A. The preformed brazing coating material is prepared from the following components in parts by mass: 50 parts of tungsten carbide powder, 5 parts of a brazing flux type binder, 1 part of a toughening agent and 44 parts of nickel-based brazing filler powder; wherein the mass of the braze-flux type adhesive is 3: 1 borax and water.
Compared with the traditional brazing coating material, the invention is suitable for the brazing coating of the rotary tillage cutter, is matched with heating in a furnace, can realize positioning, temperature setting, timing and quantitative high-efficiency brazing coating, can effectively avoid the waste of the brazing coating material and improve the working efficiency. The invention does not contain organic adhesive, has high brazing reliability, does not discharge harmful gas and residual carbon in the brazing process, is green and environment-friendly, and is beneficial to protecting the health of workers and preventing environmental pollution.
It is further noted that relational terms such as i, ii, iii, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
Claims (6)
1. A pre-forming brazing coating material for a rotary blade is characterized in that: the preformed brazing material is coated on the cutting part of the rotary blade and forms a cutter sleeve with a U-shaped section, the inner cavity of the cutter sleeve is matched with the cutting part of the rotary blade, and the preformed brazing material is prepared from the following components in parts by mass: 30-50 parts of tungsten carbide powder, 1-5 parts of brazing flux binder, 0.1-1 part of flexibilizer and 45-75 parts of nickel-based brazing filler powder; the braze-flux type binder is prepared from the following components in percentage by mass of 3: 1-2: 1, the preparation method of the soldering flux type binder comprises the following steps: 1) according to the weight percentage of borax: the water content is 3: 1-2: 1, adding the weighed water into the weighed borax while stirring until the borax is completely dissolved, and then continuously stirring for 3-5 min to form uniform pasty liquid; 2) putting the pasty liquid prepared in the step 1) into a ceramic tank of a planetary ball mill for grinding to obtain a soldering flux type binder;
a preparation method of a preformed brazing coating material for a rotary blade comprises the following steps:
A. weighing 30-50 parts of tungsten carbide powder, 1-5 parts of brazing flux type binder, 0.1-1 part of flexibilizer and 45-75 parts of nickel-based brazing filler metal powder according to parts by mass, and putting into a container for mixing, stirring and kneading to obtain an elastic powder mass with certain bonding strength;
B. placing the elastic powder dough obtained in the step A in a mould, and carrying out cold pressing to obtain a blank matched with the working surface of the rotary blade;
C. and (3) putting the blank into an oven for drying and cooling to prepare the preformed brazing coating material.
2. A preformed brazing material for rotary blades according to claim 1, wherein: the tungsten carbide powder is composed of 40-60-mesh tungsten carbide powder and 160-200-mesh tungsten carbide powder in a mass ratio of 1: 5-1: 2.
3. A preformed brazing material for rotary blades according to claim 1, wherein: the grinding speed of the planetary ball mill is 40-50 r/min, and the grinding time is 45-60 min.
4. A preformed brazing material for rotary blades according to claim 1, wherein: the toughening agent is hollow polyester fiber.
5. The method for preparing a preformed brazing material for rotary blades according to claim 1, wherein: and the die cavity in the step B is matched with the working surface of the rotary blade.
6. The method for preparing a preformed brazing material for rotary blades according to claim 1, wherein: and C, heating the blank in an oven at 0.5-2 ℃/min to 230-250 ℃, preserving heat for 1.5-2.0 h, and cooling to room temperature along with the oven.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811525203.7A CN109590637B (en) | 2018-12-13 | 2018-12-13 | Pre-forming brazing coating material for rotary blade |
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| CN201811525203.7A CN109590637B (en) | 2018-12-13 | 2018-12-13 | Pre-forming brazing coating material for rotary blade |
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| CN109590637B true CN109590637B (en) | 2021-07-02 |
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| CN109706445A (en) * | 2018-12-13 | 2019-05-03 | 郑州机械研究所有限公司 | A kind of bilayer rotary tillage cutter wear-resistant coating |
| CN110508804B (en) * | 2019-09-27 | 2021-07-02 | 郑州机械研究所有限公司 | Braze coating paste and preparation method and application thereof |
| CN113579547B (en) * | 2021-08-12 | 2023-03-10 | 郑州机械研究所有限公司 | Brazing filler metal paste for copper-aluminum dissimilar metal brazing flux-free brazing and brazing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20100215983A1 (en) * | 2009-02-20 | 2010-08-26 | Kennametal Inc. | Brazed Claddings for Cast Iron Substrates |
| US8445117B2 (en) * | 2010-09-28 | 2013-05-21 | Kennametal Inc. | Corrosion and wear-resistant claddings |
| CN202192378U (en) * | 2011-08-25 | 2012-04-18 | 郑州机械研究所 | Anti-rolling brazing filler metal |
| CN102528313A (en) * | 2012-03-04 | 2012-07-04 | 中国人民解放军总装备部军械技术研究所 | Welding rod containing waste propellant and preparation method thereof |
| CN104907722A (en) * | 2015-05-25 | 2015-09-16 | 郑州机械研究所 | Brass flux-cored brazing filler metal with reducing agents and flow aids and preparation method thereof |
| CN106541223A (en) * | 2015-09-23 | 2017-03-29 | 天津职业技术师范大学 | Cloth-like Nickel-based brazing material and its preparation method and application |
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Effective date of registration: 20221010 Address after: 315700 no.929 Binhai Avenue, Danxi street, Xiangshan County, Ningbo City, Zhejiang Province (main building) 2002 Patentee after: Ningbo Intelligent Machine Tool Research Institute Co., Ltd. of China National Machinery Institute Group Address before: 450000 149 science Avenue, Zhengzhou high tech Industrial Development Zone, Henan Patentee before: ZHENGZHOU RESEARCH INSTITUTE OF MECHANICAL ENGINEERING Co.,Ltd. |