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- Plywood Hot Press
English 
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| Quantity: | |
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Q235/Q345
XINHUACHENG
8466.92
In wood processing machinery, the two most important mechanical equipment are the hot press machine and the cold press machine, so today we will talk about the most important part of the hot press machine, the hot press plate.
First of all, the function of hot pressing is: under the condition of heating and pressurization, the board is quickly compressed to a predetermined thickness; under the condition of heat preservation and pressure, the adhesive is cured, the board is formed, and part of the moisture in the board is vaporized, from out of the board.
Traditional heating methods include steam heating and electric heating. Steam heats up quickly, but it needs to be equipped with a pressure boiler. The pipeline pressure is high, and the steam is easy to condense into water, resulting in uneven plate temperature; electric heating has the characteristics of fast temperature rise, high heating temperature, and simple control, but it consumes a lot of electricity and consumes a lot of energy. It is difficult to replace resistance wire in specific applications.
The advantages of heat conduction oil heating are: high heat capacity, uniform temperature, high temperature under normal pressure, low heat loss, and low production cost. Its disadvantage is that the heating rate is slow and the temperature is difficult to control. In the furniture industry, when the hot pressing temperature is not high, the hot water circulation furnace can also achieve satisfactory results, and the fixed investment and working costs are very low.
Its role is very important because it is mainly used to transfer pressure, heat, etc., and it is the mechanical strength, stiffness and heat transfer performance of the hot pressing plate that affect the quality of the finished product and the output of the equipment. The hot-pressed plate is divided into two materials, ordinary plate and manganese plate.
Common steel plate is a kind of steel plate: the abbreviation of ordinary carbon structural steel. It belongs to a large category of steel products, including: Q235, SS400, A36, SM400St37-2, etc. Q represents the yield of this material, and the following 235 refers to the yield value of this material, which is around 235. And the yield value will decrease as the thickness of the material increases.
It can be annealed. It is generally used in the manufacture of weldment blanks. Due to the welding stress, the internal stress should be eliminated, so annealing treatment can be used。
Q235 plates generally come out in a normalized state.
When the cross section of Q235 is not large, it can be quenched and tempered at low temperature.
It can be used to make 4.8 grade bolts with not too large diameter, etc.
In addition, surface treatment such as carburizing rate fire is also possible.
Generally speaking, the manganese plate is a low-alloy high-strength structural steel, 16Mn (Q345) or 16Mn (Q345), which is weldable and can be welded by various methods. 16Mn was renamed Q345. There are five grades of Q345: A, B, C, D, and E, and different types have different uses.
Different: The lower limit of the yield strength of q235 is 235mpa, and the lower limit of the yield strength of q345 is 345mpa. The alloy content of the two is different: q235 is ordinary carbon steel , q345 is low alloy steel.
performance and application
q235--Metal structural parts, carburized or cyanided parts with low core strength requirements, tie rods, connecting rods, hooks, couplers, bolts and nuts, sleeves, shafts and weldments.
q345--Good comprehensive mechanical properties, low temperature performance, good plasticity and weldability, used as medium and low pressure containers, oil tanks, vehicles, cranes, mining machinery, power stations, bridges and other dynamic load-bearing structures, mechanical parts, building structures , General metal structural parts, used in hot rolling or normalizing state, can be used in various structures below -40C.
If the structure is controlled by strength, you can consider using q345. If the structure is controlled by stiffness, you can consider using q235. The price of q345 is slightly more expensive, but because of its high strength, it can save materials. The specific selection can be comprehensively compared from the above points.
The function of the hot press plate can be evaluated from several aspects, firstly, the application of the press plate material, secondly, the processing accuracy, and finally, the placement of the medium holes in the hot press plate.
The hot-pressed plate is generally made of an integral restrained steel plate through deep hole drilling, which is mainly used for oil heating and steam heating; another method is to paste an aluminum plate on the back of the welded pipe, which is mainly used for electric heating. The entire steel plate can prevent oil leakage caused by poor sealing, and has high rigidity and strength, but the hot-pressed plate is thicker; the latter generally uses thin plates, which will generate stress during welding, so high processing accuracy is required.
Thin hot pressing plate is easy to preheat and control temperature, but it has high requirements on the workpiece, and the uneven thickness of the workpiece will cause deformation of the pressing plate and affect the quality of subsequent processing. Thick hot press plate is beneficial to increase heat capacity, positive strength and stiffness, but it will increase the overall size of the woodworking hot press and consume more steel.
During manufacturing and processing, the flatness of the hot pressing plate and the upper and lower surfaces should have sufficient parallelism. The flatness tolerance of the hot-pressed plate should be in the range of 0.1-0.18mm, the parallelism tolerance should be in the range of 0.15-027mm, and the surface roughness of the plate should be 3.2μm. The temperature difference across the entire width of the hot press plate should not exceed 2-3°C. If the temperature difference is too large, the moisture will be uneven, and the product will easily warp, which will affect the strength and appearance quality of the product.
People in the general furniture industry don't pay much attention to the heating channel of the heating medium in the hot press plate. Correct circuit planning should be based on the principle of facilitating heat medium movement, heating the plate evenly, and reducing heat medium leakage. For small presses used in the furniture industry, the single-hole and double-ring design is generally adopted, which can meet the application requirements.
In wood processing machinery, the two most important mechanical equipment are the hot press machine and the cold press machine, so today we will talk about the most important part of the hot press machine, the hot press plate.
First of all, the function of hot pressing is: under the condition of heating and pressurization, the board is quickly compressed to a predetermined thickness; under the condition of heat preservation and pressure, the adhesive is cured, the board is formed, and part of the moisture in the board is vaporized, from out of the board.
Traditional heating methods include steam heating and electric heating. Steam heats up quickly, but it needs to be equipped with a pressure boiler. The pipeline pressure is high, and the steam is easy to condense into water, resulting in uneven plate temperature; electric heating has the characteristics of fast temperature rise, high heating temperature, and simple control, but it consumes a lot of electricity and consumes a lot of energy. It is difficult to replace resistance wire in specific applications.
The advantages of heat conduction oil heating are: high heat capacity, uniform temperature, high temperature under normal pressure, low heat loss, and low production cost. Its disadvantage is that the heating rate is slow and the temperature is difficult to control. In the furniture industry, when the hot pressing temperature is not high, the hot water circulation furnace can also achieve satisfactory results, and the fixed investment and working costs are very low.
Its role is very important because it is mainly used to transfer pressure, heat, etc., and it is the mechanical strength, stiffness and heat transfer performance of the hot pressing plate that affect the quality of the finished product and the output of the equipment. The hot-pressed plate is divided into two materials, ordinary plate and manganese plate.
Common steel plate is a kind of steel plate: the abbreviation of ordinary carbon structural steel. It belongs to a large category of steel products, including: Q235, SS400, A36, SM400St37-2, etc. Q represents the yield of this material, and the following 235 refers to the yield value of this material, which is around 235. And the yield value will decrease as the thickness of the material increases.
It can be annealed. It is generally used in the manufacture of weldment blanks. Due to the welding stress, the internal stress should be eliminated, so annealing treatment can be used。
Q235 plates generally come out in a normalized state.
When the cross section of Q235 is not large, it can be quenched and tempered at low temperature.
It can be used to make 4.8 grade bolts with not too large diameter, etc.
In addition, surface treatment such as carburizing rate fire is also possible.
Generally speaking, the manganese plate is a low-alloy high-strength structural steel, 16Mn (Q345) or 16Mn (Q345), which is weldable and can be welded by various methods. 16Mn was renamed Q345. There are five grades of Q345: A, B, C, D, and E, and different types have different uses.
Different: The lower limit of the yield strength of q235 is 235mpa, and the lower limit of the yield strength of q345 is 345mpa. The alloy content of the two is different: q235 is ordinary carbon steel , q345 is low alloy steel.
performance and application
q235--Metal structural parts, carburized or cyanided parts with low core strength requirements, tie rods, connecting rods, hooks, couplers, bolts and nuts, sleeves, shafts and weldments.
q345--Good comprehensive mechanical properties, low temperature performance, good plasticity and weldability, used as medium and low pressure containers, oil tanks, vehicles, cranes, mining machinery, power stations, bridges and other dynamic load-bearing structures, mechanical parts, building structures , General metal structural parts, used in hot rolling or normalizing state, can be used in various structures below -40C.
If the structure is controlled by strength, you can consider using q345. If the structure is controlled by stiffness, you can consider using q235. The price of q345 is slightly more expensive, but because of its high strength, it can save materials. The specific selection can be comprehensively compared from the above points.
The function of the hot press plate can be evaluated from several aspects, firstly, the application of the press plate material, secondly, the processing accuracy, and finally, the placement of the medium holes in the hot press plate.
The hot-pressed plate is generally made of an integral restrained steel plate through deep hole drilling, which is mainly used for oil heating and steam heating; another method is to paste an aluminum plate on the back of the welded pipe, which is mainly used for electric heating. The entire steel plate can prevent oil leakage caused by poor sealing, and has high rigidity and strength, but the hot-pressed plate is thicker; the latter generally uses thin plates, which will generate stress during welding, so high processing accuracy is required.
Thin hot pressing plate is easy to preheat and control temperature, but it has high requirements on the workpiece, and the uneven thickness of the workpiece will cause deformation of the pressing plate and affect the quality of subsequent processing. Thick hot press plate is beneficial to increase heat capacity, positive strength and stiffness, but it will increase the overall size of the woodworking hot press and consume more steel.
During manufacturing and processing, the flatness of the hot pressing plate and the upper and lower surfaces should have sufficient parallelism. The flatness tolerance of the hot-pressed plate should be in the range of 0.1-0.18mm, the parallelism tolerance should be in the range of 0.15-027mm, and the surface roughness of the plate should be 3.2μm. The temperature difference across the entire width of the hot press plate should not exceed 2-3°C. If the temperature difference is too large, the moisture will be uneven, and the product will easily warp, which will affect the strength and appearance quality of the product.
People in the general furniture industry don't pay much attention to the heating channel of the heating medium in the hot press plate. Correct circuit planning should be based on the principle of facilitating heat medium movement, heating the plate evenly, and reducing heat medium leakage. For small presses used in the furniture industry, the single-hole and double-ring design is generally adopted, which can meet the application requirements.
