Miner chain plate material
Publish: 2021-05-06 04:18:24
1. With the standard roof chain as the bearing surface and the motor recer as the power transmission, it runs in the professional guide rail. According to the different process flow, the roof chain can be divided into transformation and linear type. According to the material, it can be divided into carbon steel, stainless steel, plastic steel plate chain conveyor, which is widely used in the transmission of food, canned drinks, etc
2.
The chain plate is made of 45? Steel, the pin and roller are made of 40Cr
3. 1. You can use a magnet to suck. Stainless steel is non-magnetic steel. You can know if it is made of stainless steel by suction
2. It can be tested with stainless steel chemical composition determination solution (n low). Drop a drop of liquid medicine on the plate. If it passes through the point, it will show that 201 is maroon, 202 is yellowish, and 304 stainless steel is unchanged
3. Different chemical composition determination solution (M2) should be selected to distinguish 316 and 304 materials. It is also the color of electricity, but this should be noted. Both materials are discolored, but 304 fades slowly, leaving a little bit of background color, 316 fades fast, leaving almost no color.
2. It can be tested with stainless steel chemical composition determination solution (n low). Drop a drop of liquid medicine on the plate. If it passes through the point, it will show that 201 is maroon, 202 is yellowish, and 304 stainless steel is unchanged
3. Different chemical composition determination solution (M2) should be selected to distinguish 316 and 304 materials. It is also the color of electricity, but this should be noted. Both materials are discolored, but 304 fades slowly, leaving a little bit of background color, 316 fades fast, leaving almost no color.
4. PP material and POM material
5.
Chain plate
has stainless steel, engineering plastics, carbon steel and other materials, a wide range of specifications, can be selected according to the conveying materials and process requirements, can meet the different needs of all walks of life
it is widely used in food, canned food, medicine, beverage, cosmetics, motorcycle assembly line, animal slaughtering proction line, washing procts, paper procts, condiments, dairy and tobacco, etc. for automatic transportation, distribution, and on-line transportation of post packaging
6.
Chains are usually made of metal
The chain includes four series: transmission chain; Conveyor chain; Drag chain; Special professional chain2. A series of usually metal links or rings: chain shaped objects used to obstruct traffic passage (such as in the street, at the entrance of river or harbor); A chain for mechanical loading
The chain can be divided into short pitch precision roller chain; Short pitch precision roller chain; Bending roller chain for heavy load transmission; Cement machinery chain, plate chain; High strength chain
extended data:
daily maintenance of chain:
1. The sprocket should be installed on the shaft without deflection and swing. In the same transmission assembly, the end faces of two sprockets should be in the same plane. When the center distance of sprockets is less than 0 and 5 meters, the allowable deviation is 1 mm; When the center distance of sprocket is more than 0 m or 5 m, the allowable deviation is 2 mm
However, friction on the side of sprocket teeth is not allowed. If the offset of two wheels is too large, it is easy to cause chain separation and accelerated wear. Pay attention to check and adjust the offset when replacing the sprocket If the chain is too tight, the power consumption will be increased and the bearing will be easily worn; Too loose chain is easy to jump and take off. The tightness of the chain is: lift or press down from the middle of the chain, and the center distance between the two sprockets is about 2-3cm3. The new chain is too long or stretched after use, which is difficult to adjust. The chain links can be removed according to the situation, but they must be even. The chain link shall pass through the back of the chain, the locking piece shall be inserted outside, and the opening of the locking piece shall be in the opposite direction of rotation
7.
The wear resistance of ordinary POM plastic chain plate is worse than that of high-quality POM plastic chain plate
POM is easy to aging, and the general service life is about 3 years
extended data
plastic chain plate, the main materials are: plastic steel acetal, polypropylene, PP, polyethylene, PE, nylon, PA, belongs to a kind of conveyor belt, and this is also a new type of conveyor belt, compared with the traditional conveyor belt has many advantages:
has the characteristics of high strength, acid resistance, alkali resistance, salt water resistance, wide temperature range, good anti adhesion, It can increase the baffle plate, with large lifting angle, easy to clean and easy to maintain. It can be used for conveying in various environments
such as pharmaceutical instry, food instry, packaging instry, daily chemical instry, automobile instry, logistics instry, entertainment facilities, conveyor belt, conveyor equipment, etc
according to the material: polypropylene, polyoxymethylene, polyethylene
according to the pitch: 12.5mm, 15.2mm, 19.05mm, 25.4mm, 31.75mm, 27.2mm, 38.1mm, 50.8mm, 57.15mm
according to the degree of environmental protection: food grade, non food grade
according to the performance: high temperature resistance, oil resistance, wear resistance, acid and alkali corrosion resistance
8. The application of chip removal chain plate is mainly used for the cooling and conveying of glass procts and castings, or the discharging and conveying of machining iron chips. It can also transport all kinds of metal procts, such as stamping waste or all kinds of metal processing parts, with the characteristics of large load capacity and rability< Br > chain plates are mainly as follows: chip conveyor chain plate, metal chain plate, conveying chain plate, cleaning chain plate, beer metal chain plate, chip conveyor chain plate, punching chain plate, stainless steel chain plate, carbon steel chain plate, transmission chain plate, engineering plastic chain plate, keel chain plate, etc< Br > the main characteristics of chain plate: smooth surface operation, and not easy to be disturbed by other materials, it can carry heavy materials, rable. According to the specific situation, we can design and proce the chain plate with appropriate specifications. The commonly used chain plate specifications are 31.75, 38.1 and 50.8. Compared with other transmission belts, the cost is higher< Br > the chain plates are made of stainless steel, engineering plastics, carbon steel and other materials with various specifications. They can be selected according to the conveying materials and process requirements, and can meet the different needs of all walks of life. It is widely used in food, canned food, medicine, beverage, cosmetics, motorcycle assembly line, animal slaughtering proction line, washing procts, paper procts, condiments, dairy and tobacco, etc.
9. (1) The main difference between the steel used for chain parts at home and abroad is the internal and external chain plates. The performance of chain plate requires high tensile strength and certain toughness. 40Mn and 45MN are widely used in China, while 35 steel is less used. The chemical composition of 40Mn and 45MN steel is wider than that of s35c and sael035 steel, and there is 1.5% - 2.5% decarburization in the surface layer. Therefore, the chain plate often has brittle fracture after quenching and full tempering
in the hardness test, the surface hardness of the chain plate after quenching is low (less than 40HRC). If a certain thickness of the surface layer is removed, the hardness can reach more than 50HRC, which will seriously affect the minimum tensile load of the chain< (2) foreign manufacturers generally choose s35c and sael035, adopt more advanced continuous mesh belt carburizing furnace, carburize with protective atmosphere in the heating process, and strictly control the on-site process, so the brittle fracture or low surface hardness of chain plate after quenching and tempering rarely occurs< The metallographic observation shows that there are a lot of fine acicular martensite (about 15-30um) on the surface of the chain plate after quenching, and the lath and block martensite in the center. Under the condition of the same thickness of chain plate, the minimum tensile load after tempering is larger than that of domestic procts. Generally, 1.5mm thick plate is used abroad, and the tensile force is required; 18 kn, while the domestic chain generally uses 1.6-1.7 mm thick plate, which requires tensile force & gt; 17．8 kN
(3) e to the increasing requirements for motorcycle chain parts, domestic and foreign manufacturers continue to improve the steel used for pin shaft, sleeve and roller. The minimum tensile load of the chain, especially the wear resistance, is related to the steel. The results show that the tensile load of chain increases by 13% - 18% when 20CrMnTiH steel is used as pin material instead of 20CrMnMo by domestic and foreign manufacturers recently, which is also related to sae8620 steel used as pin and sleeve material by foreign manufacturers. The practice shows that the wear resistance and tensile load of the chain can be greatly improved only by improving the fit clearance between the pin shaft and the sleeve, improving the heat treatment process and lubrication
(4) in motorcycle chain parts, the inner chain plate and sleeve, outer chain plate and pin are fixed together by interference fit, while the pin and sleeve are clearance fit. The matching of chain parts has a great influence on the wear resistance and minimum tensile load of the chain. The chain can be divided into a, B and C according to the different use occasions and failure loads. Class A is used for heavy load, high speed and important transmission; Class B is used for general transmission; Grade C is for general purpose. Therefore, the matching requirements between class a chain parts are strict
2. Heat treatment technology
heat treatment technology has a crucial impact on the internal quality of chain parts, especially the motorcycle chain. Therefore, in order to proce high quality motorcycle chain, we must have advanced heat treatment technology and equipment
e to the gap between domestic and foreign manufacturers in the understanding of motorcycle chain quality, on-site control and technical requirements, there are differences in the formulation, improvement and manufacturing process of heat treatment technology for chain parts< (1) heat treatment technology and equipment adopted by domestic manufacturers. The heat treatment equipment of chain instry in China lags behind the developed countries, especially the domestic mesh belt furnace has a series of problems such as structure, reliability and stability
the inner and outer chain plates are made of 40Mn and 45MN steel plates, which are mainly decarburized and cracked. The common mesh belt furnace is used for quenching and tempering, and there is no decarburization treatment, resulting in the decarburization layer exceeding the standard. The pin, sleeve and roller are carburized and quenched. The effective hardening depth is 0.3-0.6 mm, and the surface hardness is greater than or equal to 82 HRA. Although the roller furnace is used for flexible proction and high utilization rate of equipment, the setting and change of process parameters need to be made by technicians, and in the proction process, these manually set parameters cannot be automatically corrected with the instantaneous change of atmosphere, The quality of heat treatment still depends on the technical level of on-site technicians (skilled workers) to a great extent, and its quality reprocibility is poor. Considering the output, specifications and proction costs, this situation is difficult to change for a while< (2) heat treatment technology and equipment adopted by foreign manufacturers. The continuous mesh belt furnace or cast chain heat treatment proction line is widely used in foreign countries. The atmosphere control technology is quite mature. It is unnecessary for technicians to formulate the process, and the relevant parameters can be modified at any time according to the instantaneous change of atmosphere in the furnace; The distribution state of carburized layer concentration, hardness, atmosphere and temperature can be controlled automatically without manual adjustment. The fluctuation value of carbon concentration can be controlled in the range of ≤ 0.05%, the fluctuation value of hardness can be controlled in the range of 1hra, and the temperature can be strictly controlled in the range of 0.05% ± 5 1 ± 1 ℃
in addition to stable quality, the inner and outer chain plates have high proction efficiency. During the whole carburizing process of pin, sleeve and roller, the change of concentration distribution curve is calculated according to the actual sampling value of furnace temperature and carbon potential, and the set value of process parameters is modified and optimized at any time to ensure that the internal quality of carburized layer is under control
in a word, there is a big gap between the heat treatment technology level of motorcycle chain parts in China and that of foreign enterprises, mainly because the quality control and assurance system is not strict enough and still lags behind developed countries, especially the surface treatment technology after heat treatment. Simple, practical and pollution-free coloring technology without temperature or keeping primary color can be the first choice
3. Problems and development direction
motorcycle chain belongs to the category of instrial foundation and is a labor-intensive proct, especially in the aspect of heat treatment technology, which is still in the development stage. Due to the gap in technology and equipment, it is difficult for the chain to reach the expected service life (15000 h). In order to achieve this requirement, in addition to higher requirements for the structure, reliability and stability of heat treatment equipment, more attention should be paid to the accurate control of furnace composition, that is, the accurate control of carbon type and nitrogen type
the heat treatment of parts is developing towards micro distortion and high wear resistance. In order to greatly improve the tensile load and surface wear resistance of the pin shaft, the manufacturers with research and development ability not only improve the materials, but also try to treat the surface with other processes such as chromium plating, nitriding and carbonitriding, and have achieved good results. The key is how to make a stable process and use it in scale proction
in terms of manufacturing sleeve, the technology at home and abroad is similar. The sleeve has an important influence on the wear resistance of motorcycle chain. That is to say, the wear elongation of the chain is mainly reflected in the excessive wear of the pin shaft and sleeve. Therefore, the selection of material, joint mode, carburizing and quenching quality and lubrication are the key points. The development and proction of seamless sleeve is a hot spot to greatly improve the wear resistance of chain< There is a certain gap between the quality of domestic motorcycle chain procts and that of foreign advanced enterprises. In recent 10 years, the development of material selection and heat treatment technology of motorcycle chain has been attached great importance at home and abroad. In December 2000, China began to implement GB / t18150-2000 (equivalent to is010823:1996 roller chain drive selection guidance), which points out the direction for improving the quality and fatigue strength of chain in China. Domestic manufacturers should closely cooperate with relevant units to develop motorcycle chains for mass proction, jointly develop and trial proce chains of different materials, break through the conventional formula of using medium and low carbon steel as chain plate and 20CrMo series low carbon alloy steel as pin material, and replace low and medium alloy steel plates as chain plate, To improve the quality of the chain, the carbon content of the material used for the pin and the material used for other parts should be increased
for this reason, domestic chain manufacturers should also actively develop and proce all kinds of motorcycle engine timing chains, so as to expand the proction space of the chain, win more market share, develop and proce seamless sleeves as soon as possible, explore suitable processes such as chromium plating to greatly improve the surface hardness of the pin shaft, and actively seek measures such as high-performance chain lubricating oil, Improve the quality of motorcycle chain parts in an all-round way, and proce chains with international competitive brands to meet the market demand.
in the hardness test, the surface hardness of the chain plate after quenching is low (less than 40HRC). If a certain thickness of the surface layer is removed, the hardness can reach more than 50HRC, which will seriously affect the minimum tensile load of the chain< (2) foreign manufacturers generally choose s35c and sael035, adopt more advanced continuous mesh belt carburizing furnace, carburize with protective atmosphere in the heating process, and strictly control the on-site process, so the brittle fracture or low surface hardness of chain plate after quenching and tempering rarely occurs< The metallographic observation shows that there are a lot of fine acicular martensite (about 15-30um) on the surface of the chain plate after quenching, and the lath and block martensite in the center. Under the condition of the same thickness of chain plate, the minimum tensile load after tempering is larger than that of domestic procts. Generally, 1.5mm thick plate is used abroad, and the tensile force is required; 18 kn, while the domestic chain generally uses 1.6-1.7 mm thick plate, which requires tensile force & gt; 17．8 kN
(3) e to the increasing requirements for motorcycle chain parts, domestic and foreign manufacturers continue to improve the steel used for pin shaft, sleeve and roller. The minimum tensile load of the chain, especially the wear resistance, is related to the steel. The results show that the tensile load of chain increases by 13% - 18% when 20CrMnTiH steel is used as pin material instead of 20CrMnMo by domestic and foreign manufacturers recently, which is also related to sae8620 steel used as pin and sleeve material by foreign manufacturers. The practice shows that the wear resistance and tensile load of the chain can be greatly improved only by improving the fit clearance between the pin shaft and the sleeve, improving the heat treatment process and lubrication
(4) in motorcycle chain parts, the inner chain plate and sleeve, outer chain plate and pin are fixed together by interference fit, while the pin and sleeve are clearance fit. The matching of chain parts has a great influence on the wear resistance and minimum tensile load of the chain. The chain can be divided into a, B and C according to the different use occasions and failure loads. Class A is used for heavy load, high speed and important transmission; Class B is used for general transmission; Grade C is for general purpose. Therefore, the matching requirements between class a chain parts are strict
2. Heat treatment technology
heat treatment technology has a crucial impact on the internal quality of chain parts, especially the motorcycle chain. Therefore, in order to proce high quality motorcycle chain, we must have advanced heat treatment technology and equipment
e to the gap between domestic and foreign manufacturers in the understanding of motorcycle chain quality, on-site control and technical requirements, there are differences in the formulation, improvement and manufacturing process of heat treatment technology for chain parts< (1) heat treatment technology and equipment adopted by domestic manufacturers. The heat treatment equipment of chain instry in China lags behind the developed countries, especially the domestic mesh belt furnace has a series of problems such as structure, reliability and stability
the inner and outer chain plates are made of 40Mn and 45MN steel plates, which are mainly decarburized and cracked. The common mesh belt furnace is used for quenching and tempering, and there is no decarburization treatment, resulting in the decarburization layer exceeding the standard. The pin, sleeve and roller are carburized and quenched. The effective hardening depth is 0.3-0.6 mm, and the surface hardness is greater than or equal to 82 HRA. Although the roller furnace is used for flexible proction and high utilization rate of equipment, the setting and change of process parameters need to be made by technicians, and in the proction process, these manually set parameters cannot be automatically corrected with the instantaneous change of atmosphere, The quality of heat treatment still depends on the technical level of on-site technicians (skilled workers) to a great extent, and its quality reprocibility is poor. Considering the output, specifications and proction costs, this situation is difficult to change for a while< (2) heat treatment technology and equipment adopted by foreign manufacturers. The continuous mesh belt furnace or cast chain heat treatment proction line is widely used in foreign countries. The atmosphere control technology is quite mature. It is unnecessary for technicians to formulate the process, and the relevant parameters can be modified at any time according to the instantaneous change of atmosphere in the furnace; The distribution state of carburized layer concentration, hardness, atmosphere and temperature can be controlled automatically without manual adjustment. The fluctuation value of carbon concentration can be controlled in the range of ≤ 0.05%, the fluctuation value of hardness can be controlled in the range of 1hra, and the temperature can be strictly controlled in the range of 0.05% ± 5 1 ± 1 ℃
in addition to stable quality, the inner and outer chain plates have high proction efficiency. During the whole carburizing process of pin, sleeve and roller, the change of concentration distribution curve is calculated according to the actual sampling value of furnace temperature and carbon potential, and the set value of process parameters is modified and optimized at any time to ensure that the internal quality of carburized layer is under control
in a word, there is a big gap between the heat treatment technology level of motorcycle chain parts in China and that of foreign enterprises, mainly because the quality control and assurance system is not strict enough and still lags behind developed countries, especially the surface treatment technology after heat treatment. Simple, practical and pollution-free coloring technology without temperature or keeping primary color can be the first choice
3. Problems and development direction
motorcycle chain belongs to the category of instrial foundation and is a labor-intensive proct, especially in the aspect of heat treatment technology, which is still in the development stage. Due to the gap in technology and equipment, it is difficult for the chain to reach the expected service life (15000 h). In order to achieve this requirement, in addition to higher requirements for the structure, reliability and stability of heat treatment equipment, more attention should be paid to the accurate control of furnace composition, that is, the accurate control of carbon type and nitrogen type
the heat treatment of parts is developing towards micro distortion and high wear resistance. In order to greatly improve the tensile load and surface wear resistance of the pin shaft, the manufacturers with research and development ability not only improve the materials, but also try to treat the surface with other processes such as chromium plating, nitriding and carbonitriding, and have achieved good results. The key is how to make a stable process and use it in scale proction
in terms of manufacturing sleeve, the technology at home and abroad is similar. The sleeve has an important influence on the wear resistance of motorcycle chain. That is to say, the wear elongation of the chain is mainly reflected in the excessive wear of the pin shaft and sleeve. Therefore, the selection of material, joint mode, carburizing and quenching quality and lubrication are the key points. The development and proction of seamless sleeve is a hot spot to greatly improve the wear resistance of chain< There is a certain gap between the quality of domestic motorcycle chain procts and that of foreign advanced enterprises. In recent 10 years, the development of material selection and heat treatment technology of motorcycle chain has been attached great importance at home and abroad. In December 2000, China began to implement GB / t18150-2000 (equivalent to is010823:1996 roller chain drive selection guidance), which points out the direction for improving the quality and fatigue strength of chain in China. Domestic manufacturers should closely cooperate with relevant units to develop motorcycle chains for mass proction, jointly develop and trial proce chains of different materials, break through the conventional formula of using medium and low carbon steel as chain plate and 20CrMo series low carbon alloy steel as pin material, and replace low and medium alloy steel plates as chain plate, To improve the quality of the chain, the carbon content of the material used for the pin and the material used for other parts should be increased
for this reason, domestic chain manufacturers should also actively develop and proce all kinds of motorcycle engine timing chains, so as to expand the proction space of the chain, win more market share, develop and proce seamless sleeves as soon as possible, explore suitable processes such as chromium plating to greatly improve the surface hardness of the pin shaft, and actively seek measures such as high-performance chain lubricating oil, Improve the quality of motorcycle chain parts in an all-round way, and proce chains with international competitive brands to meet the market demand.
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