Production process for forming and trimming of wet-process cast steel ceiling framework and forming die of wet-process cast steel ceiling framework
By employing wet casting steel technology and precisely controlled mold design, the problems of uneven glass fiber distribution and low molding accuracy in dry molding have been solved, enabling the production of high-quality and efficient cast steel roof frames, and improving the mechanical properties and market competitiveness of the products.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- LINHAI SHENGSHUN MOULD MFG CO LTD
- Filing Date
- 2026-02-08
- Publication Date
- 2026-05-12
AI Technical Summary
Existing dry-forming steel casting processes suffer from problems such as uneven glass fiber distribution, poor material flowability, low forming accuracy, inaccurate cutting dimensions, and unstable product quality, making it difficult to meet the requirements of high-precision assembly.
The wet casting process is adopted, using glass fiber mat to reinforce thermoplastic sheets. Combined with technologies such as mold preheating, progressive pressurization, circulating cooling water and high-pressure water gun cleaning, it ensures uniform material flow, precise molding and edge trimming. The mold structure using reinforcing ribs and temperature control pipelines improves molding accuracy and efficiency.
This has enabled the production of high-quality, high-precision cast steel roof frames, improving the mechanical properties, surface quality, and production efficiency of the products, reducing production costs, and enhancing market competitiveness.
Smart Images
Figure CN122008588A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the technical field of wet-cast steel roof frame, and more specifically, to a production process for forming and trimming the edges of a wet-cast steel roof frame and its forming mold. Background Technology
[0002] Early steel casting processes often employed dry molding. This method was prone to uneven distribution of glass fibers during production, leading to unstable strength and mechanical properties of the canopy frame. Furthermore, the poor fluidity of materials formed by dry molding made it difficult to fully fill complex mold shapes, resulting in localized defects in the finished product, such as voids and cracks, which severely affected product quality and lifespan.
[0003] Furthermore, traditional processes lack precise control over the forming and trimming stages. For example, the forming pressure and holding time are not precisely controlled, easily leading to large dimensional deviations in the products and failing to meet high-precision assembly requirements. In the trimming process, the sharpness of the cutting edge and the trimming speed are difficult to control effectively, resulting in low dimensional accuracy and uneven edges. This requires a significant amount of subsequent manual finishing work, increasing production costs and time. Summary of the Invention
[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a high-quality, high-precision, and high-efficiency wet-cast steel roof frame forming and trimming production process and its forming mold.
[0005] To achieve the above objectives, the present invention provides the following technical solution: a production process for forming and trimming the edges of a wet-cast steel roof frame, comprising the following steps: S1. Raw material preparation: Glass fiber reinforced thermoplastic sheet is used as the main material of the tent frame. The glass fiber content of this material is 30%-50%, and the tensile strength is not less than 80MPa and the flexural strength is not less than 120MPa. S2. Material preheating: Place the material in a preheating furnace, control the preheating temperature at 200-220℃, and preheat for 3-5 minutes to make the material reach a uniform thermoplastic state, ensuring the fluidity and plasticity of the material in the subsequent molding process; S3. Mold preparation: Clean and apply release agent to the forming and trimming mold to ensure that the mold surface is smooth, the release agent is evenly covered, and the thickness is controlled at 0.05-0.1mm. Preheat the mold to 80-100℃ to reduce the temperature difference between the material and the mold and improve the molding quality; S4. Molding operation: Quickly transfer the preheated material to the molding and trimming mold. Control the mold closing pressure at 10-15MPa and the holding time at 2-3 minutes to allow the material to be fully formed in the mold cavity and obtain the required tent frame shape. During the molding process, circulating cooling water is introduced through the cooling channels inside the mold. The temperature of the cooling water is controlled at 20-30℃ to accelerate the cooling and solidification of the material. S5. Trimming process: After the canopy frame cools to 40-60℃, the trimming operation is carried out using the trimming structure on the mold. The sharpness of the trimming blade is 0.01-0.03mm, and the trimming speed is 50-100mm / s, ensuring that the trimming size accuracy is controlled within ±0.5mm. S6. Post-processing: After the edge is cut, the tent frame is deburred and cleaned to remove residual impurities and burrs from the surface, so that the surface roughness of the tent frame reaches Ra6.3-12.5μm.
[0006] The present invention is further configured such that: in the molding operation step, the mold closing process adopts a progressive pressurization method, with an initial pressure of 3-5 MPa, which is gradually increased to the set mold closing pressure within 1-2 minutes.
[0007] The present invention is further configured such that: in the post-processing step, a high-pressure water gun is used for cleaning, with a water gun pressure of 1-3 MPa, to ensure that surface impurities are thoroughly removed.
[0008] This application also provides a forming mold for the wet-cast steel roof frame forming and trimming production process. The forming mold consists of a lower mold body and an upper mold body. The lower mold body is provided with a forming cavity that matches the shape of the wet-cast steel roof frame. The lower mold body is provided with a temperature control pipeline arranged in a continuous serpentine pattern inside, which is used to circulate the temperature control medium to regulate the temperature during the forming process.
[0009] The present invention is further configured such that: the lower mold body is also provided with reinforcing ribs for improving the structural strength and deformation resistance of the mold.
[0010] The present invention is further configured such that: the lower mold body is also provided with heat dissipation holes arranged in a rectangular array.
[0011] The beneficial effects of this invention are: 1. This wet-process casting steel canopy frame forming and trimming production process has many beneficial effects. Regarding raw materials, glass fiber felt-reinforced thermoplastic sheets are selected, with a glass fiber content of 30%-50%, a tensile strength of no less than 80MPa, and a flexural strength of no less than 120MPa. This ensures excellent mechanical properties and structural stability of the canopy frame while achieving a balance between quality and cost. In the material preheating stage, preheating at 200-220℃ for 3-5 minutes ensures the material reaches a uniform thermoplastic state, improving molding results and production efficiency. During mold preparation, a 0.05-0.1mm thick release agent is applied, and preheating at 80-100℃ ensures smooth demolding and reduces temperature differences to improve molding quality. During the molding operation, a mold closing pressure of 10-15MPa, a holding pressure time of 2-3 minutes, and circulating cooling water at 20-30℃ achieve precise molding and accelerate cooling and curing. The edge trimming process is carried out at 40-60℃, using a cutting tool with a blade sharpness of 0.01-0.03mm at a speed of 50-100mm / s to ensure dimensional accuracy within ±0.5mm and good cut quality. Post-processing, including deburring and cleaning, brings the surface roughness of the tent frame to Ra6.3-12.5μm, improving surface quality, corrosion resistance, and stain resistance, which is beneficial for subsequent processes. Precise control at each stage of this process significantly improves product quality, production efficiency, and market competitiveness, resulting in good economic and social benefits.
[0012] 2. During the molding process, a progressive pressure clamping method is adopted. The initial pressure is 3-5 MPa, gradually increasing to the set clamping pressure of 10-15 MPa within 1-2 minutes. This method allows the material to fill the mold cavity more evenly, further improving the molding accuracy and quality. Pressure is held for 2-3 minutes to allow the material to fully solidify and achieve the desired shape. Simultaneously, circulating cooling water at 20-30℃ within the mold accelerates material cooling and solidification, refining the material's microstructure and improving the strength and hardness of the tent frame. The post-processing steps involve cleaning with a high-pressure water gun at 1-3 MPa to ensure thorough removal of surface impurities. Combined with deburring, the surface roughness of the tent frame reaches Ra6.3-12.5 μm, improving the product's aesthetics, corrosion resistance, and stain resistance, and also facilitating subsequent coating and other surface treatment processes.
[0013] 3. In terms of molding precision, the molding cavity of the lower mold perfectly matches the shape of the wet-cast steel ceiling ribs, accurately replicating the required product shape and reducing errors caused by mismatch between the mold and the product. This ensures that the product's dimensions and height meet design standards. Regarding temperature control, the continuous serpentine temperature control pipeline inside the lower mold base plays a crucial role. Through circulating temperature control media, it precisely regulates the temperature according to different stages of the molding process. During the heating stage, it rapidly and evenly raises the temperature, promoting material flow and molding. During the cooling stage, it promptly removes heat, ensuring rapid product solidification. This not only improves molding efficiency but also effectively avoids product defects caused by improper temperature changes, such as internal stress concentration and surface unevenness, greatly improving product quality and stability and enhancing its market competitiveness.
[0014] 4. The reinforcing ribs within the lower mold body effectively enhance the mold's structural strength and resistance to deformation. Under high-pressure molding conditions, the mold maintains a stable shape, reducing deformation caused by external forces, ensuring product molding accuracy, and significantly extending the mold's lifespan, thus lowering replacement costs. Meanwhile, the rectangular array of heat dissipation holes plays a crucial role in temperature control. They accelerate heat dissipation from within the mold and work in conjunction with the temperature control piping to ensure the mold reaches and maintains the appropriate temperature more accurately and quickly during molding. This prevents product defects caused by heat accumulation, further improving molding efficiency and product quality, and enhancing the product's market competitiveness. Attached Figure Description
[0015] Figure 1 This is a flowchart illustrating an embodiment of the production process for forming and trimming the edge of a wet-cast steel roof frame according to the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the lower mold body; Figure 3 This is a schematic diagram of the lower mold body from another direction. Figure 1-3 Reference numerals: 1. Molding chamber; 2. Temperature control pipeline; 3. Reinforcing rib; 4. Heat dissipation hole. Detailed Implementation
[0016] Reference Figure 1-3 The embodiments of the present invention will be further described below.
[0017] For ease of explanation, spatial relative terms such as “up,” “down,” “left,” and “right” are used in the embodiments to describe the relationship of one element or feature shown in the figures relative to another element or feature. It should be understood that, in addition to the orientations shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figures is inverted, an element described as being “down” of other elements or features would be positioned “up” of those other elements or features. Therefore, the exemplary term “down” can encompass both up and down orientations. The device may be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.
[0018] Moreover, relational terms such as “first” and “second” are used merely to distinguish one component from another that has the same name, without necessarily requiring or implying any such actual relationship or order between the components.
[0019] Figures 1 to 3 The production process for forming and trimming the wet-cast steel roof frame, as shown, includes the following steps: S1. Raw material preparation: Glass fiber reinforced thermoplastic sheet is used as the main material of the tent frame. The glass fiber content of this material is 30%-50%, and the tensile strength is not less than 80MPa and the flexural strength is not less than 120MPa. S2. Material preheating: Place the material in a preheating furnace, control the preheating temperature at 200-220℃, and preheat for 3-5 minutes to make the material reach a uniform thermoplastic state, ensuring the fluidity and plasticity of the material in the subsequent molding process; S3. Mold preparation: Clean and apply release agent to the forming and trimming mold to ensure that the mold surface is smooth, the release agent is evenly covered, and the thickness is controlled at 0.05-0.1mm. Preheat the mold to 80-100℃ to reduce the temperature difference between the material and the mold and improve the molding quality; S4. Molding operation: Quickly transfer the preheated material to the molding and trimming mold. Control the mold closing pressure at 10-15MPa and the holding time at 2-3 minutes to allow the material to be fully formed in the mold cavity and obtain the required tent frame shape. During the molding process, circulating cooling water is introduced through the cooling channels inside the mold. The temperature of the cooling water is controlled at 20-30℃ to accelerate the cooling and solidification of the material. S5. Trimming Process: After the canopy frame cools to 40-60℃, trim the edges using the trimming structure on the mold. The cutting edge sharpness of the trimming tool should be 0.01-0.03mm, and the trimming speed should be 50-100mm / s, ensuring that the trimming dimensional accuracy is controlled within ±0.5mm. S6. Post-processing: After the edge is cut, the tent frame is deburred and cleaned to remove residual impurities and burrs from the surface, so that the surface roughness of the tent frame reaches Ra6.3-12.5μm.
[0020] This wet-process casting steel canopy frame forming and trimming process offers numerous advantages. Regarding raw materials, it utilizes glass fiber mat-reinforced thermoplastic sheets with a glass fiber content of 30%-50%, coupled with a tensile strength of no less than 80MPa and a flexural strength of no less than 120MPa. This ensures excellent mechanical properties and structural stability of the canopy frame while achieving a balance between quality and cost. In the material preheating stage, preheating at 200-220℃ for 3-5 minutes ensures the material reaches a uniform thermoplastic state, improving molding results and production efficiency. During mold preparation, a 0.05-0.1mm thick release agent is applied, and preheating at 80-100℃ ensures smooth demolding and reduces temperature differences to improve molding quality. During the molding operation, a mold closing pressure of 10-15MPa, a holding pressure time of 2-3 minutes, and circulating cooling water at 20-30℃ achieve precise molding and accelerate cooling and curing. The edge trimming process is carried out at 40-60℃, using a cutting tool with a blade sharpness of 0.01-0.03mm at a speed of 50-100mm / s to ensure dimensional accuracy within ±0.5mm and good cut quality. Post-processing, including deburring and cleaning, brings the surface roughness of the tent frame to Ra6.3-12.5μm, improving surface quality, corrosion resistance, and stain resistance, which is beneficial for subsequent processes. Precise control at each stage of this process significantly improves product quality, production efficiency, and market competitiveness, resulting in good economic and social benefits.
[0021] During the molding process, a progressive pressure clamping method is adopted. The initial pressure is 3-5 MPa, and it is gradually increased to the set clamping pressure of 10-15 MPa within 1-2 minutes. This method allows the material to fill the mold cavity more evenly, further improving the molding accuracy and quality. Pressure is held for 2-3 minutes to allow the material to fully mold and obtain the desired shape. Simultaneously, circulating cooling water at 20-30℃ within the mold accelerates the cooling and solidification of the material, refines the material's microstructure, and improves the strength and hardness of the mold frame.
[0022] The post-processing step uses a high-pressure water gun with a pressure of 1-3MPa for cleaning, which ensures thorough removal of surface impurities. Combined with deburring and other operations, the surface roughness of the tent frame reaches Ra6.3-12.5μm, which improves the product's aesthetics, corrosion resistance and stain resistance, and is also beneficial for subsequent surface treatment processes such as coating.
[0023] This application also provides a molding die for the wet-cast steel ceiling frame forming and trimming process. The molding die consists of a lower mold body and an upper mold body. The lower mold body has a molding cavity adapted to the shape of the wet-cast steel ceiling frame. The lower mold base has a temperature control pipeline 2 arranged in a continuous serpentine pattern inside, used to circulate the temperature control medium to regulate the temperature during the molding process. In terms of molding accuracy, the molding cavity of the lower mold body perfectly matches the shape of the wet-cast steel ceiling frame, accurately replicating the required product shape and reducing errors caused by mismatch between the mold and the product, ensuring that the product's dimensions and height meet design standards. Regarding temperature control, the continuous serpentine temperature control pipeline 2 inside the lower mold base plays a crucial role. Through the circulation of the temperature control medium, it can precisely regulate the temperature according to different stages of the molding process. During the heating stage, it can quickly and uniformly raise the temperature, promoting material flow and molding; during the cooling stage, it can promptly remove heat, ensuring rapid product solidification. This not only improves molding efficiency but also effectively avoids product defects caused by improper temperature changes, such as internal stress concentration and uneven surface, greatly improving product quality and stability and enhancing product competitiveness in the market.
[0024] The lower mold body is also provided with reinforcing ribs 3 to improve the structural strength and deformation resistance of the mold. This effectively improves the structural strength and deformation resistance of the mold. Under high pressure molding environment, the mold can maintain a stable shape, reduce deformation caused by external forces, ensure the molding accuracy of the product, and greatly extend the service life of the mold, thereby reducing the cost of replacing the mold.
[0025] The lower mold body is also provided with heat dissipation holes 4 arranged in a rectangular array, which can accelerate the dissipation of heat inside the mold. Working in conjunction with the temperature control pipeline 2, this allows the mold to more accurately and quickly reach and maintain a suitable temperature during the molding process, avoiding product defects caused by heat accumulation, further improving molding efficiency and product quality, and enhancing the product's market competitiveness. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Ordinary changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included within the protection scope of the present invention.
Claims
1. A production process for forming and trimming the edges of a wet-cast steel roof frame, characterized in that, Includes the following steps: S1. Raw material preparation: Glass fiber reinforced thermoplastic sheet is used as the main material of the tent frame. The glass fiber content of this material is 30%-50%, and the tensile strength is not less than 80MPa and the flexural strength is not less than 120MPa. S2. Material preheating: Place the material in a preheating furnace, control the preheating temperature at 200-220℃, and preheat for 3-5 minutes to make the material reach a uniform thermoplastic state, ensuring the fluidity and plasticity of the material in the subsequent molding process; S3. Mold preparation: Clean and apply release agent to the forming and trimming mold to ensure that the mold surface is smooth, the release agent is evenly covered, and the thickness is controlled at 0.05-0.1mm. Preheat the mold to 80-100℃ to reduce the temperature difference between the material and the mold and improve the molding quality; S4. Molding operation: Quickly transfer the preheated material to the molding and trimming mold. Control the mold closing pressure at 10-15MPa and the holding time at 2-3 minutes to allow the material to be fully formed in the mold cavity and obtain the required tent frame shape. During the molding process, circulating cooling water is introduced through the cooling channels inside the mold. The temperature of the cooling water is controlled at 20-30℃ to accelerate the cooling and solidification of the material. S5. Trimming process: After the canopy frame cools to 40-60℃, the trimming operation is carried out using the trimming structure on the mold. The sharpness of the trimming blade is 0.01-0.03mm, and the trimming speed is 50-100mm / s, ensuring that the trimming size accuracy is controlled within ±0.5mm. S6. Post-processing: After the edge is cut, the tent frame is deburred and cleaned to remove residual impurities and burrs from the surface, so that the surface roughness of the tent frame reaches Ra6.3-12.5μm.
2. The production process for forming and trimming the wet-cast steel roof frame according to claim 1, characterized in that, In the molding process, the mold closing process adopts a progressive pressurization method, with an initial pressure of 3-5 MPa, which is gradually increased to the set mold closing pressure within 1-2 minutes.
3. The production process for forming and trimming the wet-cast steel roof frame according to claim 1, characterized in that, In the post-processing step, a high-pressure water gun is used for cleaning, with a water gun pressure of 1-3 MPa, to ensure that surface impurities are thoroughly removed.
4. The forming mold for the wet-cast steel roof frame forming and trimming production process according to claims 1-3, characterized in that, The molding die consists of a lower mold body and an upper mold body. The lower mold body is provided with a molding cavity that is adapted to the shape of the wet-cast steel ceiling frame. The lower mold base is provided with a temperature control pipeline (2) arranged in a continuous serpentine pattern to circulate the temperature control medium to regulate the temperature during the molding process.
5. The forming mold for the wet-cast steel roof frame forming and trimming production process according to claim 4, characterized in that, The lower mold body is also provided with reinforcing ribs (3) to improve the structural strength and deformation resistance of the mold.
6. The forming mold for the wet-cast steel roof frame forming and trimming production process according to claim 4, characterized in that, The lower mold body is also provided with heat dissipation holes (4) arranged in a rectangular array.