Flange furnace chassis design and manufacturing process method for improving thermal structure

Abstract

The invention provides a flange furnace chassis design and manufacturing process method for improving a thermal structure, and relates to the field of metal processing heat treatment equipment, the flange furnace chassis design and manufacturing process method comprises a chassis body, heat conduction grooves are formed in the top of the chassis body in an annular array mode, the heat conduction grooves are arc-shaped, the external specification of the chassis body is that the outer diameter phi is 2050 mm, the thickness is 140 mm, and the size phi of a center through hole is 480 mm. In the whole structure, the transition inclined plane and the heat conduction groove are designed on the lower surface of the chassis body, so that the heat conduction area and the heat transfer efficiency are increased, heat can be transferred to a silicon steel coil more quickly, and the uniform heating and annealing effects of the silicon steel coil are ensured. Meanwhile, the included angle and the number of the heat conduction grooves are optimized, it is ensured that the furnace chassis has uniform and consistent performance under the action of heating power, pressure, silicon steel coil gravity and the like, stress relief treatment is conducted on a workpiece in the machining process, the phenomena of internal stress release and the like of the chassis body are reduced, and the stability and reliability of the chassis body are improved.

Description

Technical Field

[0001] The invention relates to the field of metal processing heat treatment equipment, and in particular to a flange furnace chassis design and manufacturing process method with improved thermal structure. Background Art

[0002] As an important part of the annealing furnace, the design and performance of the flange furnace chassis directly affect the production quality and efficiency of silicon steel coils.

[0003] In the early days, conventional furnace bottom support plates were used in the thermal process of cold-rolled oriented silicon steel hood annealing furnaces. Since the highest temperature in the furnace reached 1200°C, the silicon steel coils needed to be placed on the support plates during decarburization annealing in the furnace to prevent the silicon steel coils from deforming and ensure uniform heating of the silicon steel coils, thereby improving the yield of silicon steel.

[0004] In the existing working process, when the furnace bottom plate is placed in a high-temperature annealing furnace, the heat accumulates in the flange furnace bottom plate for a long time, and the furnace bottom plate bears the weight of the silicon steel coil at the same time. The working environment is harsh and it cannot maintain the heat resistance and deformation resistance for a long time. At the same time, the furnace bottom support plate originally used by the user is similar to the shape of the friction grinding wheel, and the material is Q235-B. There is no heat conduction groove on the bottom surface of the support plate. Due to the slow heat transfer speed and uneven heat transfer between the furnace bottom plate and the product contact surface, the produced products are prone to watermarks, edge waves and other edge defects, affecting the finished product quality and yield rate of silicon steel sheets. Long-term use at high temperatures is prone to abnormal phenomena such as deformation and cracking of the furnace bottom plate, so a flange furnace bottom plate design and manufacturing process method with improved thermal structure is needed to solve the above problems. Summary of the invention

[0005] Technical issues solved

[0006] In view of the deficiencies in the prior art, the present invention provides a flange furnace bottom plate design and manufacturing process method with improved thermal structure. By improving the surface shape of the flange furnace bottom plate, sufficient heat is released evenly, deformation and cracking of the furnace bottom plate are reduced, the service life is increased, and the quality of silicon steel coils is improved.

[0007] Technical Solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: a flange furnace chassis design with improved thermal structure, including a chassis body, the top annular array of the chassis body has heat conduction grooves, the heat conduction grooves are arc-shaped, and the external specifications of the chassis body are an outer diameter of Φ2050mm, a thickness of 140mm, and a center through hole size of Φ480mm.

[0009] Preferably, the middle part of the lower surface of the chassis body from Φ800mm to the outer diameter Φ2050mm is processed into a transition slope, and the slope height is 15mm.

[0010] Preferably, the heat-conducting groove and the chassis body are horizontal, the depth of the heat-conducting groove is 30 mm, the angle of the heat-conducting groove is 4-6°, and the heat-conducting groove is distributed in a ring array.

[0011] Preferably, the included angles of the intermediate heat insulating plates between two adjacent heat conducting grooves are consistent.

[0012] Preferably, the junction between the heat-conducting groove and the middle heat-insulating plate is designed to have R3-R6 fillet.

[0013] Preferably, the bottom grille portion of the chassis body is constructed by steel beams.

[0014] Preferably, a plurality of evenly distributed support ribs are disposed inside the chassis body, and the support ribs inside the chassis body radiate outward from the central through hole and are connected to the upper and lower surfaces of the chassis body.

[0015] Preferably, a reinforcement ring is provided on the outside of the chassis body, and the reinforcement ring is tightly connected to the outer surface of the chassis body.

[0016] Preferably, a thermal bridge structure is provided between the heat-conducting groove and the central through hole.

[0017] A manufacturing process method of a flange furnace chassis with improved thermal structure, a flange furnace chassis design with improved thermal structure, including a chassis body, a top annular array of the chassis body has heat conduction grooves, the heat conduction grooves are arc-shaped, and the external specifications of the chassis body are: outer diameter Φ2050mm, thickness 140mm, and center through hole size: Φ480mm.

[0018] Preferably, the middle part of the lower surface of the chassis body from Φ800mm to the outer diameter Φ2050mm is processed into a transition slope, and the slope height is 15mm.

[0019] Preferably, the heat-conducting groove and the chassis body are horizontal, the depth of the heat-conducting groove is 30 mm, the angle of the heat-conducting groove is 4-6°, and the heat-conducting groove is distributed in a ring array.

[0020] Preferably, the included angles of the intermediate heat insulating plates between two adjacent heat conducting grooves are consistent.

[0021] Preferably, the junction between the heat-conducting groove and the middle heat-insulating plate is designed to have R3-R6 fillet.

[0022] Preferably, the bottom grille portion of the chassis body is constructed by steel beams.

[0023] Preferably, a plurality of evenly distributed support ribs are disposed inside the chassis body, and the support ribs inside the chassis body radiate outward from the central through hole and are connected to the upper and lower surfaces of the chassis body.

[0024] Preferably, a reinforcement ring is provided on the outside of the chassis body, and the reinforcement ring is tightly connected to the outer surface of the chassis body.

[0025] Preferably, a thermal bridge structure is provided between the heat-conducting groove and the central through hole.

[0026] A method for manufacturing a flange furnace chassis with improved thermal structure, wherein the specific manufacturing method and steps of the chassis body are as follows:

[0027] Sp1: Select SUS309S austenitic stainless steel material, use stamping, forging and casting processes to process the cut materials into shape, use a stamping machine to press the materials into a prototype, and open holes at the bottom of the chassis body to connect the pipes. The holes opened include threaded holes, bolt holes and welding holes;

[0028] Sp2: Cut a heat conduction groove on the top surface of the pressed material, and set a thermal stress relief hole on the surface;

[0029] Sp3: Install the heat sink and fins in the heat conduction groove in sequence;

[0030] Sp4: Wear-resistant coating is applied on the upper and lower surfaces of the chassis body, and insulation material is covered on the outside of the heat conduction groove. The insulation material is aluminum silicate fiber felt;

[0031] Sp5: The inner volume of the annealing furnace is set to 12m3, the temperature in the annealing furnace is constant at 1200℃, the fuel used is natural gas; the heat loss rate of the furnace is 20%. The specific manufacturing process and steps of the chassis body are as follows:

[0032] Sp1: Select SUS309S austenitic stainless steel material, use stamping, forging and casting processes to process the cut materials into shape, use a stamping machine to press the materials into a prototype, and open holes at the bottom of the chassis body to connect the pipes. The holes opened include threaded holes, bolt holes and welding holes;

[0033] Sp2: Cut a heat conduction groove on the top surface of the pressed material, and set a thermal stress relief hole on the surface;

[0034] Sp3: Install the heat sink and fins in the heat conduction groove in sequence;

[0035] Sp4: Wear-resistant coating is applied on the upper and lower surfaces of the chassis body, and insulation material is covered on the outside of the heat conduction groove. The insulation material is aluminum silicate fiber felt;

[0036] Sp5: The inner volume of the annealing furnace is set to 12m3, the temperature in the annealing furnace is constant at 1200℃, the fuel used is natural gas; the heat loss rate of the furnace is 20%.

[0037] Beneficial Effects

[0038] The present invention provides a flange furnace chassis design and manufacturing process method for improving thermal structure. It has the following beneficial effects:

[0039] 1. In the overall structure of the present invention, the lower surface of the chassis body is designed with a transition slope and heat conduction grooves, which increase the heat conduction area and heat transfer efficiency, so that the heat can be transferred to the silicon steel coil more quickly, ensuring the uniform heating and annealing effect of the silicon steel coil. At the same time, the angle and number of the heat conduction grooves are optimized to ensure that the furnace chassis has uniform and consistent performance under the effects of heat, pressure, and gravity of the silicon steel coil. During the processing, the workpiece is subjected to stress relief treatment, which reduces the phenomenon of stress release inside the chassis body and improves the stability and reliability of the chassis body. At the same time, through strict testing and quality control, the manufacturing accuracy and performance of the chassis body are ensured.

[0040] 2. According to calculations, under the same operating conditions and unit time, the heat transferred to the silicon steel coil by the newly designed flange furnace chassis is greater than that of the early designed products, which is beneficial to the annealing of oriented silicon steel products and can ensure the stability and further improvement of the quality of silicon steel products.

[0041] 3. The chassis of the present invention is additionally provided with a supporting structure, and the chassis body structure is optimized and upgraded to enhance its load-bearing capacity and anti-deformation ability to adapt to the harsh working environment. During assembly, the expansion pipeline from the oil-gas separator to the heat conduction groove is required to rise vertically all the time to ensure the natural convection of the hot oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A top view of the chassis body of the present invention;

[0043] Figure 2 It is a side view of the chassis body of the present invention;

[0044] Figure 3 It is a schematic diagram of the thermal bridge structure of the present invention.

[0045] Among them: 1. Chassis body; 2. Heat conduction groove; 3. Reinforcement ring. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Specific embodiment one:

[0048] like Figure 1-3As shown, a flange furnace chassis design with improved thermal structure includes a chassis body 1, a top annular array of the chassis body 1 has heat conduction grooves 2, the heat conduction grooves 2 are arc-shaped, and the external specifications of the chassis body 1 are: outer diameter Φ2050mm, thickness 140mm, and center through hole size: Φ480mm.

[0049] The middle part of the lower surface of the chassis body 1 from Φ800mm to the outer diameter Φ2050mm is processed into a transition slope with a slope height of 15mm.

[0050] The heat conducting groove 2 and the chassis body 1 are horizontal, the depth of the heat conducting groove 2 is 30 mm, the angle of the heat conducting groove 2 is 4-6°, and they are distributed in a ring array.

[0051] In actual operation, through the above design, the heat in the annealing box is increased and quickly transferred to the bottom of the furnace bottom plate, and then the heat is transferred to the silicon steel coil for annealing through the furnace bottom plate.

[0052] The included angles of the intermediate heat insulation plates between two adjacent heat conduction grooves 2 are consistent, and the junction between the heat conduction groove 2 and the intermediate heat insulation plate is designed to be R3-R6 rounded, which can reduce the phenomenon of stress release inside the chassis body 1.

[0053] The bottom grille of the chassis body 1 is constructed by steel beams. A plurality of evenly distributed support ribs are arranged inside the chassis body 1 . The support ribs in the chassis body 1 radiate outward from the central through hole and are connected to the upper and lower surfaces of the chassis body 1 .

[0054] Through the support structure, the chassis body 1 structure is optimized and upgraded to enhance its load-bearing capacity and anti-deformation ability to adapt to harsh working environments. During assembly, the expansion pipeline from the oil-gas separator to the heat conduction groove 2 is required to rise vertically all the time to ensure natural convection of the hot oil.

[0055] A reinforcement ring 3 is provided on the outside of the chassis body 1 , and the reinforcement ring 3 is tightly connected to the outer surface of the chassis body 1 . The presence of the reinforcement ring 3 can further enhance the rigidity and deformation resistance of the chassis, especially when bearing the weight of the silicon steel coil.

[0056] A thermal bridge structure is provided between the heat conducting groove 2 and the central through hole. Figure 3 As shown, the thermal bridge structure can effectively and quickly transfer the heat in the central through hole area to the peripheral heat conduction groove 2, thereby improving the thermal conduction efficiency of the entire chassis body 1.

[0057] Heat-resistant stainless steel SUS309S is used as the main material of the furnace chassis. Compared with traditional Q235-B carbon structural steel, it has higher heat resistance, oxidation resistance and corrosion resistance, and can work stably for a long time in a high temperature environment.

[0058] In the overall structure, the lower surface of the chassis body 1 is designed with a transition slope and a heat conduction groove 2, which increases the heat conduction area and heat transfer efficiency, so that the heat can be transferred to the silicon steel coil more quickly, ensuring the uniform heating and annealing effect of the silicon steel coil. At the same time, the angle and number of the heat conduction grooves 2 are optimized to ensure that the furnace chassis has uniform and consistent performance under the effects of heat, pressure, and gravity of the silicon steel coil.

[0059] During the processing, the workpiece is subjected to stress relief treatment, which reduces the phenomenon of stress release inside the chassis body 1 and improves the stability and reliability of the chassis body 1. At the same time, the manufacturing accuracy and performance of the chassis body 1 are ensured through strict testing and quality control. Specific embodiment 2:

[0061] like Figure 1-3 As shown, a flange furnace chassis manufacturing process method with improved thermal structure, the specific manufacturing process method and steps of the chassis body 1 are as follows:

[0062] Sp1: Select SUS309S austenitic stainless steel material, use stamping, forging and casting processes to process the cut materials into shapes, use a stamping machine to press the materials into a prototype, and open holes at the bottom of the chassis body 1 to connect the pipes. The opened holes include threaded holes, bolt holes and welding holes;

[0063] Sp2: A heat conduction groove 2 is cut on the top surface of the pressed material, and a thermal stress release hole is set on the surface. These holes can allow a part of the material to undergo a slight change when the chassis body 1 is heated, thereby releasing thermal stress and reducing cracking and deformation caused by thermal stress;

[0064] Sp3: Install heat sinks and fins in the heat conduction slot 2 in sequence to increase the heat dissipation area and improve the heat dissipation efficiency;

[0065] Sp4: A wear-resistant coating is applied to the upper and lower surfaces of the chassis body 1, and a heat-insulating material is covered on the outside of the heat-conducting groove 2. The heat-insulating material is aluminum silicate fiber felt to reduce heat loss;

[0066] Sp5: Set the inner volume of the annealing furnace to 12m3, the temperature in the annealing furnace to be constant at 1200℃, the fuel used is natural gas; the heat loss rate of the furnace is 20%, and then start calculating the heat required by the annealing furnace:

[0067] Q=(V×ρ×c×Δt)÷(1-20%)

[0068] Q=(12×0.75×2.2×1200)÷0.8=29700MJ

[0069] In the above formula, the meanings of specific symbols are:

[0070] Q: The heat released after a certain fuel is completely burned - Joule J

[0071] V: Volume - m3 (the volume of the annealing furnace)

[0072] ρ: density - kg / m 3 (Natural gas density: 0.75kg / m 3 )

[0073] c: Specific heat capacity - kJ / kg·K; natural gas (CH4) specific heat capacity at 25°C: 2.2 kJ / kg.k

[0074] Δt: temperature difference --℃; relative to room temperature, furnace temperature: 1200℃

[0075] The furnace bottom support plate used by early customers has a finished thickness of 110mm and is made of Q235-A or. There is no heat conduction groove on the bottom surface under the flange. After calculation, the surface area of ​​the workpiece is S = 7113665.325mm2.

[0076] Now a new design of flange furnace chassis with improved thermal structure has a finished product thickness of 140mm, which is 30mm thicker than the early product and has improved rigidity. The material used is: SUS309S. After calculation, the surface area of ​​the workpiece is S=8256322.005mm2.

[0077] According to the above data, the surface area of ​​the newly designed furnace chassis workpiece increases by 16.1%.

[0078] According to Fourier's law, the amount of heat conducted is proportional to the temperature gradient, the heat transfer area, and the heat transfer time.

[0079] The formula is as follows:

[0080]

[0081] Φ=Q / τ---heat transfer rate, W;

[0082] A---area of ​​isothermal surface, m2;

[0083] λ---Proportional coefficient, called thermal conductivity, W / (m·℃)

[0084] The negative sign indicates that the direction of heat flow is always opposite to the direction of the temperature gradient.

[0085] According to the above comparison, under the same working conditions and unit time, the heat transmitted to the silicon steel coil by the newly designed flange furnace chassis is greater than that of the early designed products, which is conducive to the annealing of oriented silicon steel products and can better ensure the stability and further improvement of the quality of silicon steel products. Specific embodiment three:

[0087] like Figure 1-3 As shown, the chassis body 1 needs to meet the following technical requirements during the manufacturing process:

[0088] ①. The material is SUS309S rolled, and defects such as cracks, slag inclusions, loose structure, shrinkage holes, etc. are not allowed.

[0089] ②. Processing can be carried out after rough machining and ultrasonic flaw detection are qualified.

[0090] ③. After the through holes, bevels and grooves are processed, the workpiece is subjected to stress relief treatment.

[0091] ④. The R3 fillet inside the groove is processed strictly according to the drawing.

[0092] ⑤. Parallelism of upper and lower surfaces <0.1mm, flatness of upper flange furnace chassis <0.2mm;

[0093] ⑥. The upper and lower surface roughness requirements are Ra < 3.2um;

[0094] ⑦. The chemical composition is as follows: C: ≤0.08, Si: ≤1.00, Mn: ≤2.00, 0.40~0.70, S≤0.030, P≤0.035, Cr: 22~24, Ni: 12~15.

[0095] ⑧. Yield strength (σb): ≥205MPa, tensile strength (σ0.2) ≥520MPa, elongation (δ5) ≥40%, hardness: HB187, surface roughness Ra<3.2um. Specific embodiment three:

[0097] like Figure 1-3 As shown, the material of the chassis body 1 is SUS309S austenitic stainless steel, and the material parameters of the chassis body 1 are compared with those of the Q235B steel plate used in existing production as shown in the following table:

[0098] (1) Chemical composition:

[0099]

[0100] (2) Physical properties:

[0101]

[0102] According to the above two tables analysis:

[0103] Q235-B steel plate is a low-carbon steel. It complies with the national standard GB / T 700-2006 "Carbon Structural Steel". Q235-B is one of the most common steel materials in China. It is inexpensive and can be used for most products with low performance requirements. Q235-B has a certain elongation, strength, good toughness and castability, is easy to stamp and weld, and is widely used in the manufacture of general mechanical parts.

[0104] SUS309S austenitic stainless steel is often used in operations under high temperature environments. Its high chromium and nickel content has high high temperature strength, ensuring good corrosion resistance and oxidation resistance. Compared with austenitic 304 alloy, it has a higher strength at room temperature. Excellent corrosion resistance and strength, suitable for parts with working temperatures of 1000℃. Including exhaust machines, heat treatment furnaces and heat exchangers.

[0105] Based on the above analysis, the tensile strength of SUS309S material is greater than that of Q235-B; a flange furnace chassis design with improved thermal structure chooses SUS309S material, which can better meet and satisfy actual production needs, and its performance is better than that of Q235-B material.

[0106] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprising a reference structure" do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0107] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A flange furnace chassis design with improved thermal structure, comprising a chassis body (1), characterized in that: The top annular array of the chassis body (1) has heat conduction grooves (2), and the heat conduction grooves (2) are arc-shaped. The external specifications of the chassis body (1) are: outer diameter Φ2050mm, thickness 140mm, and center through hole size: Φ480mm.

2. A flange furnace chassis design for improving thermal structure according to claim 1, characterized in that: The middle part of the lower surface of the chassis body (1) from Φ800mm to the outer diameter Φ2050mm is processed into a transition slope with a slope height of 15mm.

3. A flange furnace chassis design for improving thermal structure according to claim 1, characterized in that: The heat-conducting groove (2) and the chassis body (1) are horizontal, the depth of the heat-conducting groove (2) is 30 mm, the included angle of the heat-conducting groove (2) is 4-6°, and they are distributed in a ring array.

4. A flange furnace chassis design for improving thermal structure according to claim 1, characterized in that: The included angles of the intermediate heat insulating plates between two adjacent heat conducting grooves (2) are consistent.

5. A flange furnace chassis design for improving thermal structure according to claim 1, characterized in that: The junction between the heat-conducting groove (2) and the middle heat-insulating plate is designed to have R3-R6 fillets.

6. A flange furnace chassis design for improving thermal structure according to claim 1, characterized in that: The bottom grille portion of the chassis body (1) is constructed by means of steel beams.

7. A flange furnace chassis design for improving thermal structure according to claim 1, characterized in that: A plurality of evenly distributed support ribs are arranged inside the chassis body (1); the support ribs inside the chassis body (1) radiate outwards from the central through hole and are connected to the upper and lower surfaces of the chassis body (1).

8. The flange furnace chassis design for improving thermal structure according to claim 1 is characterized by: A reinforcement ring (3) is provided on the outside of the chassis body (1), and the reinforcement ring (3) is tightly connected to the outer surface of the chassis body (1).

9. The flange furnace chassis design for improving thermal structure according to claim 1 is characterized by: A thermal bridge structure is provided between the heat-conducting groove (2) and the central through hole.

10. A method for manufacturing a flange furnace chassis with improved thermal structure, characterized in that: The specific manufacturing process and steps of the chassis body (1) are as follows: Sp1: Select SUS309S austenitic stainless steel material, use stamping, forging and casting processes to process and shape the cut material, use a stamping machine to press the material into a prototype, and open holes at the bottom of the chassis body (1) to connect the pipes. The opened holes include threaded holes, bolt holes and welding holes; Sp2: cutting a heat conduction groove (2) on the top surface of the pressed material, and setting a thermal stress release hole on the surface; Sp3: Install the heat sink and fins in the heat conduction groove (2) in sequence; Sp4: A wear-resistant coating is applied to the upper and lower surfaces of the chassis body (1), and a heat-insulating material is covered on the outside of the heat-conducting groove (2), wherein the heat-insulating material is aluminum silicate fiber felt; Sp5: The inner volume of the annealing furnace is set to 12m3, the temperature in the annealing furnace is constant at 1200℃, the fuel used is natural gas; the heat loss rate of the furnace is 20%.

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