CN111111897A - Bimetal composite striking plate for fan type coal mill and processing technology thereof - Google Patents
Bimetal composite striking plate for fan type coal mill and processing technology thereof Download PDFInfo
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- CN111111897A CN111111897A CN201911364202.3A CN201911364202A CN111111897A CN 111111897 A CN111111897 A CN 111111897A CN 201911364202 A CN201911364202 A CN 201911364202A CN 111111897 A CN111111897 A CN 111111897A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D31/00—Cutting-off surplus material, e.g. gates; Cleaning and working on castings
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
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Abstract
A bimetal composite striking plate for a fan type coal mill comprises an inner striking plate and an outer striking plate, wherein the inner striking plate and the outer striking plate are both cast by 35# steel and high-chromium alloy; an inner striking plate clapboard and an outer striking plate clapboard are respectively arranged between the inner striking plate and the outer striking plate; the processing technology comprises the following steps: 1) designing a product drawing; 2) designing a mould; 3) manufacturing a partition plate; 4) modeling; 5) pouring; 6) discharging the product out of the box; 7) polishing the workpiece; 8) inspecting the product; 9) and (4) carrying out heat treatment on the product. The invention adopts two different metals for smelting and one-time composite casting; the abrasion resistance and the impact resistance of the striking plate are improved, and the service cycle is prolonged; meanwhile, the maintenance cost of the fan mill is reduced; the downtime is reduced, and the equipment operation rate is improved; the loss of the reduction of equipment productivity and the increase of power consumption caused by abrasion is reduced; reduce the environmental pollution caused by abrasion, damage and blanking and increase the cost of cleaning and maintaining.
Description
Technical Field
The invention belongs to the field of application of power plant mechanical accessories, and particularly relates to a processing technology of a fan mill bimetal composite striking plate.
Background
In power generation of a power plant, machine consideration is generally carried out according to selected coal types, and a fan type coal mill is more suitable for grinding high-moisture lignite and soft bituminous coal compared with other coal mills. During the working process of the fan coal mill, the fineness of pulverized coal grinding also relates to the quality of power generation and combustion of a power plant. After the crocus grinding work is accomplished at fan-type coal pulverizer, can blow into the boiler with the buggy through the hot branch, then the hot flue gas that the buggy formed after the boiler fully burns can be exothermic along the boiler flow, follow-up coal ash separation that carries on, and fan-type coal pulverizer's grinding efficiency and meticulous degree have a fine assurance, so change in, the buggy is fully burnt at the boiler, also can improve the utilization ratio of buggy, reduces environmental pollution.
The work of current fan coal pulverizer is the impacted style, so to its component structure if strike the board and require highly, it not only needs can be quick dismantle, still will have wear-resisting, shock-resistant, characteristics such as high temperature resistant, current strike board that is used for fan coal pulverizer, the structure is complicated and do not have wear-resisting, shock-resistant, characteristics such as high temperature resistant, can not satisfy current fan coal pulverizer's assembly user demand, and this is present waiting to solve urgently. Therefore, in view of the above problems, it is necessary to provide a fan-driven striking plate that is capable of improving the wear resistance and impact resistance of the striking plate and prolonging the service life by modifying the product according to the working conditions of the customer site.
Disclosure of Invention
The invention aims to provide a bimetal composite striking plate for a fan-type coal mill and a processing technology thereof, and solves the technical problems.
In order to achieve the technical purpose and achieve the technical requirements, the invention adopts the technical scheme that: the utility model provides a fan-type coal pulverizer is with compound striking board of bimetal which characterized in that: the bimetal composite striking plate comprises an inner striking plate and an outer striking plate, wherein the inner striking plate and the outer striking plate are both cast by 35# steel and high-chromium alloy; and an inner striking plate clapboard and an outer striking plate clapboard are respectively arranged between the inner striking plate and the outer striking plate.
Preferably, the method comprises the following steps: the inner striking plate partition board and the outer striking plate partition board are respectively provided with a plurality of rows of pins which are uniformly distributed, and the pins in the adjacent rows are arranged in a staggered manner.
The processing technology of the bimetal composite striking plate for the fan-type coal mill is characterized by comprising the following steps of: the method comprises the following steps:
1) product drawing design: redesigning according to the overall dimension of the striking plate used on site, making a new manufacturing process, disassembling a part drawing and noting the manufacturing dimension key point;
2) designing a mold: the lining plate mould is produced by adopting a wood mould (a special bottom plate for a mould is matched);
3) manufacturing a partition plate: when the partition board is manufactured, the length of the partition board is required to be consistent with the positioning of the die, and the deviation is controlled within 1 mm;
4) modeling: the casting adopts a special sand box and a resin sand production process;
5) pouring: two metal materials are used for casting: one is high chromium alloy, and one is 35# steel;
6) discharging the product out of the box: casting and preserving heat for 24 hours, and taking out of the box, wherein the workpiece after being taken out of the box cannot be horizontally placed and needs to be vertically placed and cooled to normal temperature;
7) polishing a workpiece: when a casting is polished, a dead head part needs to be cleaned, flatness is ensured, thermal cutting is not needed as much as possible, and peripheral burrs are cleaned;
8) product inspection: detecting each part by spectrum, determining whether the casting is qualified according to the spectrum report, and performing heat treatment after the casting is qualified;
9) and (3) heat treatment of the product: the heat treatment adopts the process specified by the company for heat treatment, the concentration and the temperature of the quenching liquid are detected, the hardness of the casting is ensured, no crack exists, and the hardness HRC56-58 is obtained after the heat treatment; the casting needs to be vertically placed and fixed, and abnormal conditions such as bending and the like during quenching are avoided.
Further: the mould in the step 2) is divided into an upper moulding box and a lower moulding box, two vertical pouring channels of molten steel are made on the upper moulding box and the lower moulding box, a loam core is additionally arranged at the bottom of the striking plate in a through-length mode, and a horizontal pouring channel and an inner pouring channel are made on two side faces of the loam core; and reserving a dead head positioning position on the bottom plate, positioning the partition plate on the striking plate body mould according to a drawing, calculating the shrinkage rate of the casting by 2.6% for the rest of the moulds except for the moulds with certain dimensions specified by the drawing without shrinkage, inspecting the moulds according to the drawing, and waiting for drying and standby after painting.
Further: the pin shaft for the partition plate in the step 3) is customized by adopting a standard part, so that the length and the right angle are consistent according to a figure; the diameter ratio of the drilled hole of the partition board is equal to plus 0.5mm of the pin shaft, the flatness of the partition board is ensured, the pin shaft needs to be penetrated on a special template and is firmly welded, and the partition board is subjected to rust removal treatment after being qualified.
Further: the partition plate in the step 3) comprises an outer striking plate partition plate and an inner striking plate partition plate, three rows of pins are arranged on the outer striking plate partition plate, and two adjacent rows of pins are arranged in a staggered manner; seven rows of pin bolts are arranged on the inner striking plate partition plate, and two adjacent rows of pin bolts are arranged in a staggered manner; the right middle of the outer striking plate clapboard and the inner striking plate clapboard is provided with a pin shaft hole which is connected through a pin shaft.
Further: in the step 4), a chill needs to be arranged on the casting working surface, the height of a riser is about 200mm, and the coating of the cavity is coated for 2-3 times to ensure the strength of the coating; checking the stability and firmness of the mud core of each part, if a molding box has a gap, embedding refractory materials, and scraping a coating to ensure that the corner cleaning coating does not stagnate after the molding box is brushed with the coating; and removing redundant paint and resin sand garbage in the cavity, arranging a partition plate according to the shape of a drawing, checking whether the partition plate and the molding box have no gap, closing the molding box after the partition plate and the molding box are qualified, and fastening a fixing bolt.
Further: in the step 5): controlling the temperature of the two materials before pouring, and performing deoxidation work to ensure that no gas exists in the molten steel; casting the 35# steel firstly when casting, casting the high-chromium alloy molten steel after the molten steel enters the die cavity for about 3-5 seconds, observing the casting speed, wherein the molten steel of the 35# steel is slightly higher than the high-chromium alloy and rises synchronously; stopping pouring when the No. 35 molten steel reaches the height of the partition plate of the molding box; continuously pouring the high-chromium alloy, and stopping pouring when the high-chromium alloy molten steel reaches the root of the riser; and after about 10 seconds, continuously pouring the high-chromium alloy molten steel until the riser is full, and finishing the pouring.
The invention adopts two different metals for smelting and one-time composite casting; the abrasion resistance and the impact resistance of the striking plate are improved, and the service cycle is prolonged; meanwhile, the maintenance cost of the fan mill is reduced; the downtime is reduced, and the equipment operation rate is improved; the loss of the reduction of equipment productivity and the increase of power consumption caused by abrasion is reduced; reduce the environmental pollution caused by abrasion, damage and blanking and increase the cost of cleaning and maintaining.
Drawings
FIG. 1 is a table of chemical compositions of high carbon and high chromium alloys;
FIG. 2 is a table of chemical compositions of No. 35 steel;
FIG. 3 is a view of the outer striking plate diaphragm;
FIG. 4 is a view of the inner striking plate diaphragm;
FIG. 5 is a schematic cross-sectional view of an outer striking plate;
FIG. 6 is a schematic cross-sectional view of an inner striking plate
In the figure: 1. an outer striking plate spacer; 2. an inner striking plate spacer; 3. an outer striking plate; 4. an inner striking plate; 5. a pin.
Detailed Description
1. Drawing design: redesigning according to the overall dimension of the striking plate used on site, making a new manufacturing process, disassembling a part drawing and noting the manufacturing dimension.
2. Designing a mold: the lining plate mould is produced by adopting a wood mould (a special bottom plate for a matched mould). The mould is divided into an upper molding box and a lower molding box, two vertical pouring channels for molten steel are made on the upper molding box and the lower molding box, the bottom of the striking plate is additionally provided with a loam core in a through-length mode, and a horizontal pouring channel and an inner pouring channel are made on two side faces of the loam core. And reserving a dead head positioning position on the bottom plate, positioning a partition plate on a striking plate body mould according to a drawing, calculating the rate of accommodation of the casting by the rest of the moulds according to 2.6% except that the sizes of the moulds are not shrunk according to the drawing, inspecting the moulds according to the drawing, and waiting for drying and standby after painting.
3. Manufacturing a partition plate: when the partition board is manufactured, the length of the partition board is required to be consistent with the positioning of the die, and the deviation is controlled within 1 mm. The partition pin shaft is customized by adopting a standard part, so that the length and the right angle are ensured to be consistent according to a figure. The diameter ratio of the drilled hole of the partition board is equal to plus 0.5mm of the pin shaft, the flatness of the partition board is ensured, the pin shaft needs to be penetrated on a special template and is firmly welded, and the partition board is subjected to rust removal treatment after being qualified. The bimetal composite striking plate comprises an inner striking plate 4 and an outer striking plate 3, wherein the inner striking plate 4 and the outer striking plate 3 are both cast by 35# steel and high-chromium alloy; the middle of the inner striking plate 3 and the middle of the outer striking plate 4 are respectively provided with an inner striking plate clapboard 2 and an outer striking plate clapboard 1. A plurality of rows of pins 5 which are uniformly distributed are arranged on the two sides of the inner striking plate partition plate 2 and the outer striking plate partition plate 1, and the pins 5 in the adjacent rows are arranged in a staggered mode.
4. Modeling: the casting adopts a special sand box and a resin sand production process. A casting working surface needs to be provided with a chill, the height of a riser is about 200mm, and a cavity coating is coated for 2-3 times to ensure the strength of the coating. Checking the stability and firmness of the mud core of each part, if the molding box has a gap, embedding refractory materials, and scraping the coating to ensure that the corner cleaning coating does not stagnate after the molding box is brushed with the coating. And removing redundant paint and resin sand garbage in the cavity, arranging a partition plate according to the shape of a drawing, checking whether the partition plate and the molding box have no gap, closing the molding box after the partition plate and the molding box are qualified, and fastening a fixing bolt.
5. Pouring: the casting adopts two metal materials, one is high-chromium alloy, and the other is 35# steel (the specific component proportion is shown in attached figures 1 and 2); before pouring, the temperature of the two materials is controlled, and deoxidation work is carried out to ensure that no gas exists in the molten steel. When in casting, the 35# steel is cast firstly, after the molten steel enters the die cavity for about 3-5 seconds, the high-chromium alloy molten steel is cast, the casting speed is observed, and the 35# steel molten steel is slightly higher than the high-chromium alloy and rises synchronously. And stopping pouring when the No. 35 molten steel reaches the height of the partition plate of the molding box. And continuously pouring the high-chromium alloy, and stopping pouring when the molten high-chromium alloy steel reaches the root of the riser. And after about 10 seconds, continuously pouring the high-chromium alloy molten steel until the riser is full, and finishing the pouring.
6. Discharging: and (4) taking out the workpiece from the box after casting and heat preservation for 24 hours, wherein the workpiece taken out of the box cannot be horizontally placed and needs to be vertically placed and cooled to the normal temperature.
7. Polishing: when the casting is polished, the dead head position needs to be cleaned, the casting is ensured to be flat, thermal cutting is not needed as much as possible, and peripheral burrs are cleaned.
8. And (4) checking: detecting each part by spectrum, determining whether the casting is qualified according to the spectrum report, and performing heat treatment after the casting is qualified.
9. And (3) heat treatment: the heat treatment is carried out by adopting the process specified by the company, the concentration and the temperature of the quenching liquid are detected, the hardness of the casting is ensured, no crack is generated, and the hardness HRC56-58 is obtained after the heat treatment. The casting needs to be vertically placed and fixed, and abnormal conditions such as bending and the like during quenching are avoided.
The foregoing examples are given solely for the purpose of illustrating the invention and are not to be construed as limiting the embodiments, and other variations and modifications in form thereof will be suggested to those skilled in the art upon reading the foregoing description, and it is not necessary or necessary to exhaustively enumerate all embodiments and all such obvious variations and modifications are deemed to be within the scope of the invention.
Claims (7)
1. The utility model provides a fan-type coal pulverizer is with compound striking board of bimetal which characterized in that: the bimetal composite striking plate comprises an inner striking plate (4) and an outer striking plate (3), wherein the inner striking plate (4) and the outer striking plate (3) are both cast by 35# steel and high-chromium alloy; the middle of the inner striking plate (3) and the middle of the outer striking plate (4) are respectively provided with an inner striking plate clapboard (2) and an outer striking plate clapboard (1).
2. The bimetallic composite striking plate for the fan-type coal mill according to claim 1, characterized in that: the inner striking plate partition plate (2) and the outer striking plate partition plate (1) are respectively provided with a plurality of rows of uniformly distributed pins (5), and the pins (5) in the adjacent rows are arranged in a staggered manner.
3. A processing technology of a bimetal composite striking plate for a fan-type coal mill comprises the following steps: the method comprises the following steps:
product drawing design: redesigning according to the overall dimension of the striking plate used on site, making a new manufacturing process, disassembling a part drawing and noting the manufacturing dimension key point;
designing a mold: the lining plate mould is produced by adopting a wood mould (a special bottom plate for a mould is matched);
manufacturing a partition plate: when the partition board is manufactured, the length of the partition board is required to be consistent with the positioning of the die, and the deviation is controlled within 1 mm;
modeling: the casting adopts a special sand box and a resin sand production process;
pouring: two metal materials are used for casting: one is high chromium alloy, and one is 35# steel;
discharging the product out of the box: casting and preserving heat for 24 hours, and taking out of the box, wherein the workpiece after being taken out of the box cannot be horizontally placed and needs to be vertically placed and cooled to normal temperature;
polishing a workpiece: when a casting is polished, a dead head part needs to be cleaned, flatness is ensured, thermal cutting is not needed as much as possible, and peripheral burrs are cleaned;
product inspection: detecting each part by spectrum, determining whether the casting is qualified according to the spectrum report, and performing heat treatment after the casting is qualified;
and (3) heat treatment of the product: the heat treatment adopts the process specified by the company for heat treatment, the concentration and the temperature of the quenching liquid are detected, the hardness of the casting is ensured, no crack exists, and the hardness HRC56-58 is obtained after the heat treatment; the casting needs to be vertically placed and fixed, and abnormal conditions such as bending and the like during quenching are avoided.
4. The processing technology of the bimetal composite striking plate for the fan-type coal mill according to claim 4, characterized in that: the mould in the step 2) is divided into an upper moulding box and a lower moulding box, two vertical pouring channels of molten steel are made on the upper moulding box and the lower moulding box, a loam core is additionally arranged at the bottom of the striking plate in a through-length mode, and a horizontal pouring channel and an inner pouring channel are made on two side faces of the loam core; and reserving a dead head positioning position on the bottom plate, positioning the partition plate on the striking plate body mould according to a drawing, calculating the shrinkage rate of the casting by 2.6% for the rest of the moulds except for the moulds with certain dimensions specified by the drawing without shrinkage, inspecting the moulds according to the drawing, and waiting for drying and standby after painting.
5. The processing technology of the bimetal composite striking plate for the fan-type coal mill according to claim 4, characterized in that: the pin shaft for the partition plate in the step 3) is customized by adopting a standard part, so that the length and the right angle are consistent according to a figure; the diameter ratio of the drilled hole of the partition board is equal to plus 0.5mm of the pin shaft, the flatness of the partition board is ensured, the pin shaft needs to be penetrated on a special template and is firmly welded, and the partition board is subjected to rust removal treatment after being qualified.
6. The processing technology of the bimetal composite striking plate for the fan-type coal mill according to claim 4, characterized in that: in the step 4), a chill needs to be arranged on the casting working surface, the height of a riser is about 200mm, and the coating of the cavity is coated for 2-3 times to ensure the strength of the coating; checking the stability and firmness of the mud core of each part, if a molding box has a gap, embedding refractory materials, and scraping a coating to ensure that the corner cleaning coating does not stagnate after the molding box is brushed with the coating; and removing redundant paint and resin sand garbage in the cavity, arranging a partition plate according to the shape of a drawing, checking whether the partition plate and the molding box have no gap, closing the molding box after the partition plate and the molding box are qualified, and fastening a fixing bolt.
7. The processing technology of the bimetal composite striking plate for the fan-type coal mill according to claim 4, characterized in that: in the step 5): controlling the temperature of the two materials before pouring, and performing deoxidation work to ensure that no gas exists in the molten steel; casting the 35# steel firstly when casting, casting the high-chromium alloy molten steel after the molten steel enters the die cavity for about 3-5 seconds, observing the casting speed, wherein the molten steel of the 35# steel is slightly higher than the high-chromium alloy and rises synchronously; stopping pouring when the No. 35 molten steel reaches the height of the partition plate of the molding box; continuously pouring the high-chromium alloy, and stopping pouring when the high-chromium alloy molten steel reaches the root of the riser; and after about 10 seconds, continuously pouring the high-chromium alloy molten steel until the riser is full, and finishing the pouring.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117483723A (en) * | 2023-12-29 | 2024-02-02 | 邯郸慧桥复合材料科技有限公司 | Manufacturing method of wear-resistant composite casting and detection method of composite interface bonding strength |
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