CN1200794C - Pile-up welding striking board manufacturing method - Google Patents
Pile-up welding striking board manufacturing method Download PDFInfo
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- CN1200794C CN1200794C CN 02130863 CN02130863A CN1200794C CN 1200794 C CN1200794 C CN 1200794C CN 02130863 CN02130863 CN 02130863 CN 02130863 A CN02130863 A CN 02130863A CN 1200794 C CN1200794 C CN 1200794C
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Abstract
The present invention relates to a manufacturing method of a striking plate of main parts in a fan coal grinding mill used for fuel electric plants, which belongs to the technical field of weld. The manufacturing method of a pile-up welding striking plate comprises the procedures of the preheating of a basal body, the tooling of the basal body, the build-up weld of two medium-high alloy material layers, heat treatment after the weld, finishing, processing, etc. The manufacturing method of the pile-up welding striking plate of the present invention uses a low carbon and low alloy rolled plate as the basal body, adopts a build-up welding method for the build-up weld of the metallic layers of medium-high alloy materials on the basal body and has the advantages of high strength, high tenacity, high hardness and high abrasion resistance, and service life is increased to more than 1.5 to 2 times. Particularly, the volume and the weight of the striking plate are greatly reduced to reduce the load of a fan coal grinding mill and increase striking space so as to save energy consumption and improve efficiency, and moreover, the present invention has obvious economic benefit.
Description
Technology neck city
The manufacture method of critical piece beater plate belongs to welding technology field in the blower mill that the present invention relates to use in the thermal power plant.
Background technology
Blower mill is an equipment of in the thermal power plant bunker coal being pulverized processing, so that the fuel of the coal dust with certain fineness is provided for the generator boiler.Coal is pulverized under the impact of beater wheel and rubbing action, also eliminates simultaneously the most of moisture content in the coal, obtains sufficient drying, and beater plate be in the beater wheel surface be hit, wash away, critical component easy to wear.Beater plate in " S " type blower mill beater wheel that China's imported technology is produced, it is that beater plate by three different-thickness is combined into stairstepping, and a synthetic working face (small-sized coal pulverizer is formed a working face by 1～2 beater plate), with the beater plate of low-carbon and low-alloy material Mn13 casting.Its advantage is higher intensity, toughness to be arranged, moderate wearability.But this beater plate is owing to weight consumes energy greatly greatly, because the alloy content of material is low and not wear-resisting, because the internal flaw that casting produces and easy fracture, thereby in the long-term deficiencies such as highly energy-consuming, low life-span, potential safety hazard are big that show in service.To equipment, operating personnel's personal safety is had great threat.
Summary of the invention
The present invention is directed to exist in the prior art to topic, design and a kind ofly do matrix with the low-carbon and low-alloy rolled plate, adopt overlaying method to weld middle and high alloy material metal level, make the pile-up welding striking board of high strength, high tenacity, high rigidity, high-wear resistance, thereby have better serviceability and longer service life.
The manufacture method of pile-up welding striking board of the present invention, its step is as follows:
1) pre-hot basal body: selecting the low-carbon and low-alloy rolled plate for use is matrix; On matrix surface, lay electric heating sheets and add hot basal body to 60～80 ℃, and cover insulation, temperature retention time 30～40 minutes with insulation material;
2) matrix frock: the matrix of preheating insulation is placed on the convex workbench, and the both sides of its length direction and workbench rigidity are fixed, and block with copper water-cooled piece in both sides in addition;
3) built-up welding: the welding rod of alloy material during ground floor is selected for use, carry out built-up welding continuously with the power supply of MZ1000 type automatic arc welding, this layer main component is that to contain weight ratio be 0.8～1.0% carbon, 1.8% manganese, 1.2% silicon, 4.0～5.0% chromium, 1.5～2.0% molybdenum; Postwelding hardness HRC52～55; Thickness is less than half of two overlay cladding thickness;
The second layer is selected the automatic welding wire of high alloy material for use, carries out built-up welding continuously automatically with MZ1000-1 type automatic arc welding; This layer main component is that to contain weight ratio be 3.0～4.0% carbon, 1.4% manganese, 1.2% silicon, 18～20% chromium, 0.5～1.0% molybdenum, 1.0% vanadium; Postwelding hardness HRC58～62; Be welded to the thickness of requirement;
Wherein two-layer built-up welding operation must be carried out incessantly continuously, and interlayer temperature is remained between 180～220 ℃;
4) post weld heat treatment: the matrix of postwelding is covered with insulation material, under the surplus temperature state of matrix, be incubated 6～7 hours, after cooling, unload;
5) finishing and processing: remove built-up welding overproof projection in surface and welding slag in the polishing mode; And matrix is worked into the size that requires by machining.
The manufacture method of pile-up welding striking board of the present invention, wherein two overlay cladding thickness must not surpass 1/3 of beater plate gross thickness.
The manufacture method of pile-up welding striking board of the present invention, wherein matrix can be a monoblock, also can be the structure of the synthetic working face of matrix of two same thickness, thickness is determined according to the design needs.
The manufacture method of pile-up welding striking board of the present invention, do matrix with the low-carbon and low-alloy rolled plate, adopt overlaying method, the metal level of the middle and high alloy material of built-up welding on matrix, have high strength, high tenacity, high rigidity and high-wear resistance, be original more than 1.5～2 times service life.Particularly the volume and weight of beater plate greatly reduces, and the blower mill load is reduced, hit the space and increase, thereby energy efficient raise the efficiency, have tangible economic benefit.
Description of drawings
Fig. 1 is a pile-up welding striking board structural profile schematic diagram of the present invention;
Fig. 2 settles the state generalized section for the preceding matrix of welding;
Fig. 3 is the A-A directional profile schematic diagram of Fig. 2.
The specific embodiment
Select for use the low-carbon alloy rolled plate to do matrix 1, it is to have certain thickness rectangular slab, and leaves allowance.On matrix 1 one surfaces, lays electric heating sheets before the built-up welding, and cover, add hot basal body to 60～80 ℃, be incubated 30～40 minutes with insulation material.Purpose is the deposition intensity that improves between matrix surface and the resurfacing welding material.
By Fig. 2, Fig. 3 as seen, the matrix 1 with preheating before the welding is placed on the convex workbench 4, and the both sides 5 of its length direction rigidly fix with convex workbench 4 and are connected, and block with copper water-cooled piece 6 in both sides in addition, so that resurfacing welding material is forced to be shaped in edge.Being placed on the convex workbench 4 is to do reversible deformation in advance, makes postwelding matrix 1 recover straight through being out of shape in cooling procedure.
Can carry out the built-up welding operation through after the above-mentioned installation adjustment, the welding rod of alloy material during ground floor 2 is selected for use, power supply with MZ1000 type automatic arc welding carries out built-up welding continuously, the second layer 3 is selected the automatic welding wire of high alloy material for use, automatically carry out built-up welding continuously with MZ1000-1 type automatic arc welding, be welded to the thickness of requirement.Owing to be two-layer built-up welding, the interpass temperature must remain between 180～220 ℃.Therefore, each layer built-up welding operation must be carried out incessantly continuously, can reach and keep such interlayer temperature.
Postwelding is heat-treated workpiece, is about to workpiece under the surplus temperature condition of postwelding, covers with insulation material, is incubated 6～7 hours, just unloads after cooling.Its objective is to make slowly evenly cooling of workpiece, to alleviate crackle or distortion tendency.Remove built-up welding overproof projection in surface and welding slag in the polishing mode then, and matrix is worked into the size that requires by machining.
The matrix of specific embodiments of the invention is that long 947mm, wide 500mm, thickness are the Mn16 low-carbon and low-alloy rolled plate of 60mm, beater plate by above-mentioned manufacture method built-up welding one-tenth, replace the beater plate of three different-thickness of former cause to be combined into a working face, beater plate with low-carbon and low-alloy material Mn13 casting, through operation for a long time, has better serviceability and longer service life.
Claims (3)
1, a kind of manufacture method of pile-up welding striking board the steps include:
1) pre-hot basal body: selecting the low-carbon and low-alloy rolled plate for use is matrix (1); On matrix (1) surface, lay electric heating sheets and add hot basal body to 60～80 ℃, and cover insulation, temperature retention time 30～40 minutes with insulation material;
2) matrix frock: the matrix (1) of preheating insulation is placed on the convex workbench (4), and the both sides of its length direction (5) are fixed with the workbench rigidity, and block with copper water-cooled piece (6) in both sides in addition;
3) built-up welding: the welding rod of alloy material during ground floor (2) is selected for use, carry out built-up welding continuously with the power supply of MZ1000 type automatic arc welding, this layer main component is that to contain weight ratio be 0.8～1.0% carbon, 1.8% manganese, 1.2% silicon, 4.0～5.0% chromium, 1.5～2.0% molybdenum; Postwelding hardness HRC52～55; Thickness is less than half of two overlay cladding thickness;
The second layer (3) is selected the automatic welding wire of high alloy material for use, automatically carry out built-up welding continuously with MZ1000-1 type automatic arc welding, this layer main component is that to contain weight ratio be 3.0～4.0% carbon, 1.4% manganese, 1.2% silicon, 18～20% chromium, 0.5～1.0% molybdenum, 1.0% vanadium; Postwelding hardness HRC58～62; Be welded to the thickness of requirement;
Two-layer built-up welding operation must be carried out incessantly continuously, and interlayer temperature is remained between 180～220 ℃;
4) post weld heat treatment: the matrix (1) of postwelding is covered with insulation material, under the surplus temperature state of matrix, be incubated 6～7 hours, after cooling, unload;
5) finishing and processing: remove built-up welding overproof projection in surface and welding slag in the polishing mode; And matrix (1) is worked into the size that requires by machining.
2, the manufacture method of pile-up welding striking board according to claim 1 is characterized in that two overlay cladding thickness must not surpass 1/3 of beater plate gross thickness.
3, the manufacture method of pile-up welding striking board according to claim 2 is characterized in that matrix (1) can be a monoblock, also can be the structure of the synthetic working face of matrix (1) of two same thickness, and thickness is determined according to the design needs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02130863 CN1200794C (en) | 2002-10-14 | 2002-10-14 | Pile-up welding striking board manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02130863 CN1200794C (en) | 2002-10-14 | 2002-10-14 | Pile-up welding striking board manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1490117A CN1490117A (en) | 2004-04-21 |
| CN1200794C true CN1200794C (en) | 2005-05-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02130863 Expired - Fee Related CN1200794C (en) | 2002-10-14 | 2002-10-14 | Pile-up welding striking board manufacturing method |
Country Status (1)
| Country | Link |
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| CN (1) | CN1200794C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101585013B (en) * | 2009-07-10 | 2011-04-13 | 沈阳重型机械集团有限责任公司 | Impulse wheel of fan coal grinding mill using casting-forging welding device |
| CN103447711B (en) * | 2013-08-28 | 2016-06-01 | 黑龙江八一农垦大学 | Agricultural machinery and implement soil-engaging component plasma build-up wear-resistant powdered alloy and overlaying method |
| CN103894262B (en) * | 2014-03-19 | 2016-02-03 | 大连汉顿工业有限公司 | The abrasionproof beater plate of a kind of blower mill and use thereof |
| CN104139231A (en) * | 2014-06-17 | 2014-11-12 | 铁岭灵飞重型机器有限公司 | Composite surfacing method |
| CN105879973B (en) * | 2016-06-02 | 2018-03-13 | 兴化市安帅电力设备有限公司 | Wear-resisting beater plate applied to blower mill |
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2002
- 2002-10-14 CN CN 02130863 patent/CN1200794C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1490117A (en) | 2004-04-21 |
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