A method for surface cladding after alloy powder wire mesh composite rolling

Abstract

The present invention discloses a method for surface cladding after composite rolling of alloy powder wire mesh, firstly, the alloy powder material is uniformly rolled onto a metal wire mesh belt to obtain an alloy powder wire mesh belt blank, then the alloy powder wire mesh belt blank is covered and attached to the surface of a metal solid, and fixed (such as welding and fixing the edge of the metal powder wire mesh composite blank belt material), and then the alloy powder wire mesh belt blank is clad onto the surface of the metal solid. The present invention can solve the powder feeding problem in the surface cladding process while maintaining the physical and chemical properties of the powder by uniformly rolling the alloy powder onto the metal wire mesh belt, simplifying the mechanical structure of the surface cladding equipment, and improving the surface cladding production efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of surface cladding, in particular to a method for surface cladding after composite rolling of alloy powder wire mesh. Background Art

[0002] Laser cladding technology refers to placing the selected coating material on the surface of the substrate in different filler methods, melting it simultaneously with the shallow layer on the substrate surface through laser irradiation, and forming a surface coating with extremely low dilution and metallurgical bonding with the substrate material after rapid solidification, thereby significantly improving the wear resistance, corrosion resistance, heat resistance, oxidation resistance and electrical properties of the substrate surface. Laser cladding is divided into two forms according to different powder coating methods, namely preset and synchronous. The main process flow of preset laser cladding is surface pretreatment-presetting cladding material-preheating-melting-post-heat treatment, and the main process flow of synchronous laser cladding is surface pretreatment-melting-post-heat treatment. Although synchronous laser cladding has a high degree of automation, it has the disadvantages of complex powder feeder structure, high manufacturing cost, and difficulty in mixing mixed powder evenly. Therefore, in the application of laser cladding, preset laser cladding is more commonly used, especially the method of directly presetting the powder layer.

[0003] In addition, similar patent applications were retrieved, such as application number: CN201610116307.7; patent name: Method and device for automatic tableting and placing powder tablets during laser cladding process. A method and device for automatic tableting and automatic placement of powder tablets are disclosed. The invention effectively solves the problem of achieving rapid laser cladding pre-setting powder tabletting while improving the automation level of the cladding process in the absence of a synchronous laser cladding device and manual pressing and low efficiency of placing powder tablets; Application number: CN201710335440.6; Patent name: An adjustable pre-setting powder spreading device for laser cladding. An adjustable pre-setting powder spreading device for laser cladding is disclosed. During the pre-setting powder feeding laser cladding, the powder spreading thickness and powder spreading area during the pre-setting powder spreading of laser cladding can be accurately controlled, and the powder spreading area and powder spreading thickness can be adjusted, which is convenient to operate; Application number: CN201910859162.3; Patent name: A method for preparing coatings by laser cladding by vacuum sintering. The powder to be clad is made into a paste or paste, screen-printed on the surface of the substrate to be clad, sintered to form a preset layer, and the preset layer is melted by an ultrasonic vibrator and a laser at the same time to obtain a composite coating, which is annealed and heat-treated to obtain a high-quality composite coating. It can be seen from the above patent applications that the laying of the powder to be clad is the core issue in the laser cladding process. Laying the powder evenly, achieving controllable powder thickness and reducing costs are issues that technicians are still studying. Generally, improvements are made in the powder feeding mechanism structure or the pre-setting powder process. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art and propose a method for surface cladding after alloy powder wire mesh composite rolling. By uniformly rolling the alloy powder on a metal wire mesh belt, the powder feeding problem in the surface cladding process can be solved while maintaining the physical and chemical properties of the powder, the mechanical structure of the surface cladding equipment can be simplified, and the surface cladding production efficiency can be improved.

[0005] To achieve the above object, the technical solution provided by the present invention is: a method for surface cladding of alloy powder wire mesh after composite rolling, comprising the following steps:

[0006] Step 1: Prepare the wire mesh tape

[0007] First, select the mesh size of the required metal wire mesh according to the required thickness of the cladding layer, and cut the metal wire mesh belt of the required length and width according to the shape and size of the substrate to be clad;

[0008] Step 2: Prepare alloy powder

[0009] According to the mesh number of the selected metal wire mesh, alloy powder with corresponding mesh number is selected, and after the powder is mixed, it is placed in a powder mixer for mixing to mix the powders of different components evenly;

[0010] Step 3: Alloy powder screening

[0011] According to the required powder layer thickness, adjust the powder box gap of the rolling powder feeding box, and then sieve the mixed alloy powder to remove the powder with unqualified particles to ensure the continuity of powder feeding during the rolling process;

[0012] Step 4: Prepare alloy powder wire mesh strip blank

[0013] Rolling the prepared metal mesh belt and the mixed and sieved alloy powder, evenly distributing the alloy powder on the metal mesh belt and combining them, to obtain the desired alloy powder mesh belt blank;

[0014] Step 5: Fix the alloy powder wire mesh with blank

[0015] Wrapping the alloy powder wire mesh strip blank on the substrate material to be clad, and fixing the alloy powder wire mesh strip blank on the substrate;

[0016] Step 6: Cladding and sintering

[0017] The fixed alloy powder mesh belt blank is melted and solidified to cover the surface of the base material. After the coating is completed, the metal solid surface is clad, and a suitable cladding method is used to achieve metallurgical bonding between the alloy powder mesh belt blank and the base material, thereby achieving the purpose of forming a wear-resistant coating on the surface of the base material;

[0018] Step 7: Rolling the Cladding Layer

[0019] After the cladding is completed, the cladding layer is rolled to make its structure more dense and improve the comprehensive performance of the cladding layer.

[0020] Preferably, the cladding is laser continuous local scanning sintering, plasma continuous local scanning sintering or placing the workpiece in a sintering furnace for overall sintering.

[0021] Preferably, the cladding metal solid surface is a plane, an outer surface of a cylinder or an inner surface of a metal part hole.

[0022] Preferably, the cladding metal solid surface is the surface of the gear metal part tooth, wherein the alloy powder wire mesh strip blank is firstly attached to the contour surface of the tooth, and the edge of the alloy powder wire mesh strip blank is fixed by laser welding.

[0023] Preferably, the metal wire mesh is a stainless steel wire mesh, and the alloy powder is a 304 stainless steel-WC alloy formula powder.

[0024] Preferably, the metal wire mesh is a copper wire mesh, and the alloy powder is a Cu-WC alloy composite formula powder.

[0025] Preferably, the alloy powder wire mesh strip blank has a thickness of 0.1-2.0 mm.

[0026] Preferably, the alloy powder wire mesh belt blank can be coated on the outer surface of the cylindrical material, fixed with tape, then wrapped with a layer of mica paper or graphite paper, and then locked with a wide locking hoop, and placed in a vacuum sintering furnace for sintering.

[0027] Preferably, the alloy powder is cemented carbide formula powder or titanium alloy powder.

[0028] Preferably, the cladding sintering environment is a vacuum or protective atmosphere.

[0029] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0030] 1. The present invention uses a prefabricated strip method to evenly distribute the powder on the metal wire mesh belt, with high rolling efficiency and easy control of the thickness of the powder layer. In the unsintered state, the alloy powder wire mesh belt blank has good flexibility and does not fall off when bent.

[0031] 2. The present invention pre-bonds the alloy powder wire mesh strip blank to the surface of the base metal part material. The process is simple and reliable, and the powder feeding-sintering process is simplified to the sintering process, and the cladding sintering scanning speed will be improved.

[0032] 3. The thickness of the powder metallurgy cladding layer of the present invention is easy to control and can be made thin and uniform, the surface quality of the cladding layer is better, the subsequent machining allowance is small, and the material utilization rate is high.

[0033] 4. The present invention does not require a special powder feeding system, and the structure of the required cladding device is greatly simplified, thereby reducing the equipment manufacturing cost, and the working efficiency is high and stable and reliable.

[0034] 5. Compared with the powder spraying process, the present invention consumes less powder, does not generate powder splash waste, and has a high powder utilization rate.

[0035] 6. The present invention can reduce the thickness of the metal powder layer by adjusting the gap of the rolling powder feeding box, which can effectively save costs when the unit price of the material is high.

[0036] 7. The process route of the present invention is simple and convenient, and can be applied to scenes such as repairing worn large parts of wind power generation equipment in the field.

[0037] 8. The metal wire mesh used in the present invention can be made of nickel-containing stainless steel that has good bonding performance with both the powder material and the matrix material, so as to bond the powder material with opposite properties to the surface of the steel matrix material.

[0038] 9. The method of the present invention is high in efficiency, low in cost, stable and reliable, and the surface quality of the obtained cladding layer is good. It can be mass-produced and create good economic benefits. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto.

[0040] Example 1

[0041] This embodiment discloses a method for surface cladding of alloy powder wire mesh after composite rolling, and obtains a cladding layer manufactured by surface cladding of alloy powder wire mesh after composite rolling. The materials used are 400 mesh 304 stainless steel wire mesh, 75μm WC powder and 75μm 304 stainless steel powder.

[0042] The above cladding layer, application steps and process conditions are as follows:

[0043] Step 1: Prepare the wire mesh tape

[0044] Cut the 400-mesh 304 stainless steel wire mesh into metal wire mesh strips of corresponding length and width according to the shape and size of the substrate to be clad;

[0045] Step 2: Prepare alloy powder

[0046] 75μm WC powder was mixed with 75μm 304 stainless steel powder in a powder mixing tank at a mass fraction of 10%. The mixing time was set to 24h and the speed was 60r / min.

[0047] Step 3: Alloy powder screening

[0048] Adjust the gap of the powder box used for rolling to the required width, sieve the alloy powder, repeat 3 times, and remove the powder that does not meet the particle size requirements;

[0049] Step 4: Prepare alloy powder wire mesh strip blank

[0050] The powder after sieving in the previous step is laid on the 304 stainless steel wire mesh with a preset thickness (0.1-1mm), and then the powder and the wire mesh are rolled together through a two-roll cold rolling mill to obtain a WC-304 wire mesh strip blank (i.e., alloy powder wire mesh strip blank) with high bonding strength and good toughness;

[0051] Step 5: Fix the alloy powder wire mesh with blank

[0052] The WC-304 wire mesh with good toughness prepared in the above steps is tightly coated on the outer surface of the No. 45 steel bar and pressed to make the materials fit;

[0053] Step 6: Cladding and sintering

[0054] The fixed alloy powder mesh belt blank is melted and solidified to cover the surface of the base material. After the coating is completed, the metallurgical bonding between the composite belt and the base material is achieved by laser continuous local scanning sintering, thereby achieving the purpose of forming a wear-resistant coating on the surface of the base material;

[0055] Step 7: Rolling the cladding layer. After the cladding is completed, the cladding layer is rolled to make its structure more dense and improve the comprehensive performance of the cladding layer.

[0056] Example 2

[0057] The cladding layer manufactured in this embodiment is made of 400 mesh 304 stainless steel wire mesh, 75 μm WC powder and 75 μm 304 stainless steel powder.

[0058] The above-mentioned cladding layer, application steps and process conditions are basically the same as those in Example 1. The difference from Example 1 is that in this embodiment: the mass fraction of WC powder in step 2 is 20%.

[0059] Example 3

[0060] The raw materials of the cladding layer manufactured in this embodiment are 80-mesh copper wire mesh, 180 μm WC powder and 180 μm copper powder.

[0061] The above-mentioned cladding layer, application steps and process conditions are basically the same as those in Example 1. The difference from Example 1 is that in this embodiment: the metal wire mesh in step 1 is an 80-mesh copper wire mesh, and the alloy powder in step 2 is 180μm WC powder and 180μm copper powder.

[0062] Example 4

[0063] The cladding layer manufactured in this embodiment is made of 200 mesh copper wire mesh, 75 μm WC powder and 75 μm copper powder.

[0064] The above-mentioned cladding layer, application steps and process conditions are basically the same as those in Example 1. The difference from Example 1 is that in this embodiment: the metal wire mesh in step 1 is a 200-mesh copper wire mesh, and the alloy powder in step 2 is 75μm WC powder and 75μm copper powder.

[0065] Example 5

[0066] The raw materials of the cladding layer manufactured in this embodiment are 200-mesh copper wire mesh, 75 μm WC powder and 75 μm copper powder.

[0067] The above-mentioned cladding layer, application steps and process conditions are basically the same as those in Example 1. The difference from Example 1 is that in this embodiment: the metal wire mesh in step 1 is a 200-mesh copper wire mesh, the alloy powder in step 2 is 75μm WC powder and 75μm copper powder, and the cladding method in step 6 is plasma continuous local scanning sintering cladding.

[0068] Example 6

[0069] The raw materials of the cladding layer manufactured in this embodiment are 200-mesh copper wire mesh, 75 μm WC powder and 75 μm copper powder.

[0070] The above-mentioned cladding layer, application steps and process conditions are basically the same as those in Example 1. The difference from Example 1 is that in this embodiment: the metal wire mesh in step 1 is a 200-mesh copper wire mesh, the alloy powder in step 2 is 75 μm WC powder and 75 μm copper powder, and the cladding method in step 6 is to place the workpiece in a sintering furnace for overall sintering, the sintering temperature is 850°C, and the holding time is 2 h.

[0071] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A method for surface cladding after composite rolling of alloy powder wire mesh, characterized in that: The following steps are involved: Step 1: Prepare the wire mesh tape First, select the mesh size of the required metal wire mesh according to the required thickness of the cladding layer, and cut the metal wire mesh belt of the required length and width according to the shape and size of the substrate to be clad; Step 2: Prepare alloy powder According to the mesh number of the selected metal wire mesh, alloy powder with corresponding mesh number is selected, and after the powder is mixed, it is placed in a powder mixer for mixing to mix the powders of different components evenly; Step 3: Alloy powder screening According to the required powder layer thickness, adjust the powder box gap of the rolling powder feeding box, and then sieve the mixed alloy powder to remove the powder with unqualified particles to ensure the continuity of powder feeding during the rolling process; Step 4: Prepare alloy powder wire mesh strip blank Rolling the prepared metal mesh belt and the mixed and sieved alloy powder, evenly distributing the alloy powder on the metal mesh belt and combining them, to obtain the desired alloy powder mesh belt blank; Step 5: Fix the alloy powder wire mesh with blank Wrapping the alloy powder wire mesh strip blank on the substrate material to be clad, and fixing the alloy powder wire mesh strip blank on the substrate; Step 6: Cladding and sintering The fixed alloy powder mesh belt blank is melted and solidified to cover the surface of the base material. After the coating is completed, the metal solid surface is clad, and a suitable cladding method is used to achieve metallurgical bonding between the alloy powder mesh belt blank and the base material, thereby achieving the purpose of forming a wear-resistant coating on the surface of the base material; Step 7: Rolling the Cladding Layer After the cladding is completed, the cladding layer is rolled to make its structure more dense and improve the comprehensive performance of the cladding layer.

2. The method for surface cladding after composite rolling of alloy powder wire mesh according to claim 1, characterized in that: The cladding is laser continuous local scanning sintering, plasma continuous local scanning sintering or placing the workpiece in a sintering furnace for overall sintering.

3. The method for surface cladding after composite rolling of alloy powder wire mesh according to claim 1, characterized in that: The cladding metal solid surface is a plane, an outer surface of a cylinder or an inner surface of a metal part hole.

4. The method for surface cladding after composite rolling of alloy powder wire mesh according to claim 1, characterized in that: The cladding metal solid surface is the surface of the gear metal part tooth, wherein the alloy powder wire mesh strip blank is firstly attached to the contour surface of the tooth, and the edge of the alloy powder wire mesh strip blank is fixed by laser welding.

5. The method for surface cladding after composite rolling of alloy powder wire mesh according to claim 1, characterized in that: The metal wire mesh is a stainless steel wire mesh, and the alloy powder is a 304 stainless steel-WC alloy formula powder.

6. The method for surface cladding of alloy powder wire mesh after composite rolling according to claim 1, characterized in that: The metal wire mesh is a copper wire mesh, and the alloy powder is a Cu-WC alloy composite formula powder.

7. The method for surface cladding of alloy powder wire mesh after composite rolling according to claim 1, characterized in that: The thickness of the alloy powder wire mesh strip blank is 0.1-2.0 mm.

8. The method for surface cladding after composite rolling of alloy powder wire mesh according to claim 1, characterized in that: The alloy powder wire mesh belt blank can be coated on the outer surface of a cylindrical material, fixed with an adhesive tape, then wrapped with a layer of mica paper or graphite paper, and then locked with a wide locking hoop, and placed in a vacuum sintering furnace for sintering.

9. The method for surface cladding after composite rolling of alloy powder wire mesh according to claim 1, characterized in that: The alloy powder is cemented carbide formula powder or titanium alloy powder.

10. The method for surface cladding after alloy powder wire mesh composite rolling according to claim 1, characterized in that: The cladding sintering environment is a vacuum or protective atmosphere.