Profiling and splicing method for horn-mouth-shaped stainless steel cylinder

Abstract

The invention provides a profiling and splicing method for a horn-mouth-shaped stainless steel cylinder, which comprises the following steps: cutting and blanking a planar stainless steel plate to form a planar spliced blank plate; the plane splicing blank plate is heated; the heated plane splicing blank plate is pressed, and a curved surface splicing blank plate is formed; the curved surface splicing blank plates formed after profiling are assembled, and a trumpet-shaped stainless steel cylinder assembly is formed; welding the trumpet-shaped stainless steel cylinder assembly to form a trumpet-shaped stainless steel cylinder finished product; according to the method, a plasma cutting method is adopted for cutting and blanking a planar stainless steel plate, an accurate fan-shaped planar spliced blank plate can be formed, the planar spliced blank plate is heated and subjected to heat preservation, the ductility of the material is improved, a strong constraint tool is used for positioning a trumpet-shaped stainless steel cylinder assembly, tailor welding is conducted by adopting a symmetric welding sequence, and the production efficiency is improved. The welding accuracy and uniformity are ensured, and it is ensured that the horn-mouth-shaped stainless steel cylinder has the advantages of being high in precision, quality and stability.

Description

Technical Field

[0001] The invention relates to steel production equipment, in particular to a press-forming splicing method for a bell-mouth stainless steel cylinder. Background Art

[0002] The trumpet-shaped stainless steel cylinder is one of the key components of a certain project. Patent document CN106903204B discloses a cylinder forming method, which can perform cylinder forming operations. It adopts reverse compound spinning forming of a multi-angle conical cylinder to integrate two or more sections of multi-angle conical cylinders into one. Compared with the traditional forming process of piece-by-piece welding, machining, and assembly welding, the processing efficiency is greatly improved, the processing cost is greatly reduced, the roundness requirements are met, and the processing efficiency is effectively improved. The straight edge defects formed at the butt joint of the longitudinal weld formed by piece-by-piece welding are eliminated, and the problem of easy concavity of the inner profile ring weld at the butt ring weld is also eliminated, effectively improving the overall processing accuracy, appearance quality and internal quality of the multi-angle conical cylinder.

[0003] However, in order to meet the high temperature and high performance requirements, the above-mentioned bell-shaped stainless steel cylinder is made of heat-resistant stainless steel material, which is large in size and irregular. This stainless steel material has high tensile strength at room temperature and relatively low elongation. The steel plate thickness is about 60mm, which is difficult to press at room temperature, easy to crack, and cannot be formed as a whole. Therefore, it is necessary to optimize the structure of this forming method to overcome the above defects. Summary of the invention

[0004] The purpose of the present invention is to provide a press-forming splicing method for a bell-mouth stainless steel cylinder to improve processing efficiency and product quality.

[0005] The technical solution adopted by the present invention to solve the technical problem is:

[0006] A method for press-joining a bell-mouth stainless steel cylinder, comprising the following steps:

[0007] S1, cutting and blanking the flat stainless steel plate to form a flat spliced ​​blank;

[0008] S2, heating the flat spliced ​​blank;

[0009] S3, pressing the heated flat surface spliced ​​blank to form a curved surface spliced ​​blank;

[0010] S4, assembling the curved surface spliced ​​blanks formed after the pressing to form a trumpet-shaped stainless steel cylinder assembly;

[0011] S5, welding the trumpet-shaped stainless steel cylinder assembly to form a trumpet-shaped stainless steel cylinder finished product.

[0012] In step S1, a plasma cutting method is used to cut and blank the flat stainless steel plate to form a group of fan-shaped flat spliced ​​blanks, and the size of the fan-shaped flat spliced ​​blanks has a press-forming margin.

[0013] In step S2, the planar spliced ​​blank formed by cutting is placed in a heating furnace for heating and heat preservation so that its temperature distribution is uniform to improve its elongation.

[0014] In step S3, the heated flat-surface spliced ​​blank is taken out and quickly placed on the pressing die of the pressing machine. The position is adjusted and the pressing machine is started so that the pressing punch slowly falls onto the flat-surface spliced ​​blank for precise pressing to form a curved-surface spliced ​​blank. After pressing, the blank is kept at a temperature not lower than 800°C for 30 minutes to prevent the curved-surface spliced ​​blank from rebounding.

[0015] In step S3, after the forming is completed, a sample is used to detect whether the profile of the trumpet-shaped stainless steel cylinder product meets the design requirements. If there is a deviation between the profile and the design, grinding and shaping are performed.

[0016] In step S3, during the pressing process, the pressing effect is observed in real time and the temperature of the curved surface spliced ​​blank is measured. If the temperature is lower than 800°C, the pressing needs to be stopped and the pressure is maintained for 30 minutes. The mold is opened again after the mold is completely cooled to prevent the curved surface spliced ​​blank from rebounding.

[0017] In step S4, groove processing is performed on the curved surface spliced ​​blank after the pressing process;

[0018] The curved surface spliced ​​blanks are assembled to form a trumpet-shaped stainless steel cylinder assembly that meets the design intention.

[0019] In step S5, the trumpet-shaped stainless steel cylinder assembly is positioned using a strong constraint tool, and is welded in a symmetrical welding sequence to form a trumpet-shaped stainless steel cylinder finished product.

[0020] The advantages of the present invention are:

[0021] The method adopts a plasma cutting method to cut and blank flat stainless steel plates, which can form precise fan-shaped flat spliced ​​blanks, ensuring the accuracy of subsequent steps, heating and insulating the flat spliced ​​blanks to make the temperature evenly distributed, improving the elongation of the material, ensuring the stability of the profiling, using strong constraint tooling to position the trumpet-shaped stainless steel cylinder assembly, and adopting a symmetrical welding sequence for welding, ensuring the accuracy and uniformity of welding and improving the welding quality. Through precise cutting, heating, profiling and welding steps, the high precision, high quality and high stability of the trumpet-shaped stainless steel cylinder are ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1It is a schematic diagram of the bell-mouth stainless steel cylinder structure involved in the present invention;

[0023] Figure 2 It is a schematic diagram of the processing process of the bell-mouth stainless steel cylinder. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0025] like Figure 2 As shown, the press-forming splicing method of the bell-mouth stainless steel cylinder proposed by the present invention comprises the following steps:

[0026] S1, cutting and blanking the flat stainless steel plate to form a flat spliced ​​blank;

[0027] S2, heating the flat spliced ​​blank;

[0028] S3, pressing the heated flat surface spliced ​​blank to form a curved surface spliced ​​blank;

[0029] S4, assembling the curved surface spliced ​​blanks formed after the pressing to form a trumpet-shaped stainless steel cylinder assembly;

[0030] S5, welding the trumpet-shaped stainless steel cylinder assembly to form a trumpet-shaped stainless steel cylinder finished product.

[0031] In step S1, a plasma cutting method is used to cut and blank the flat stainless steel plate to form a group of fan-shaped flat spliced ​​blanks, and the size of the fan-shaped flat spliced ​​blanks has a press-forming margin.

[0032] In step S2, the planar spliced ​​blank formed by cutting is placed in a heating furnace for heating and heat preservation so that its temperature distribution is uniform to improve its elongation.

[0033] In step S3, the heated flat-surface spliced ​​blank is taken out and quickly placed on the pressing die of the pressing machine. The position is adjusted and the pressing machine is started so that the pressing punch slowly falls onto the flat-surface spliced ​​blank for precise pressing to form a curved-surface spliced ​​blank. After pressing, the blank is kept at a temperature not lower than 800°C for 30 minutes to prevent the curved-surface spliced ​​blank from rebounding.

[0034] In step S3, after the forming is completed, a sample is used to detect whether the profile of the trumpet-shaped stainless steel cylinder product meets the design requirements. If there is a deviation between the profile and the design, grinding and shaping are performed.

[0035] In step S3, during the pressing process, the pressing effect is observed in real time and the temperature of the curved surface spliced ​​blank is measured. If the temperature is lower than 800°C, the pressing needs to be stopped and the pressure is maintained for 30 minutes. The mold is opened again after the mold is completely cooled to prevent the curved surface spliced ​​blank from rebounding.

[0036] In step S4, groove processing is performed on the curved surface spliced ​​blank after the pressing process;

[0037] The curved surface spliced ​​blanks are assembled to form a trumpet-shaped stainless steel cylinder assembly that meets the design intention.

[0038] In step S5, the trumpet-shaped stainless steel cylinder assembly is positioned using a strong constraint tool, and is welded in a symmetrical welding sequence to form a trumpet-shaped stainless steel cylinder finished product.

[0039] In step S5, after the welding is completed, a sample is used to detect whether the profile of the trumpet-shaped stainless steel cylinder product meets the design requirements. If the profile deviates from the design, grinding and shaping are performed.

[0040] In the description of the present invention, it should be noted that when terms such as "upper", "lower", "inner", "outer", "left", "right" and the like indicating orientation or positional relationship appear, it should be understood that the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed when in use, or the orientation or positional relationship commonly understood by those skilled in the art, is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the equipment or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, when terms such as "first" and "second" appear, they are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, terms such as "installation", "setting", and "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a connection between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A method for press-joining a bell-mouth stainless steel cylinder, characterized in that: The following steps are involved: S1, cutting and blanking the flat stainless steel plate to form a flat spliced ​​blank; S2, heating the flat spliced ​​blank; S3, pressing the heated flat surface spliced ​​blank to form a curved surface spliced ​​blank; S4, assembling the curved surface spliced ​​blanks formed after the pressing to form a trumpet-shaped stainless steel cylinder assembly; S5, welding the trumpet-shaped stainless steel cylinder assembly to form a trumpet-shaped stainless steel cylinder finished product.

2. The method for press-joining a bell-mouth stainless steel cylinder according to claim 1, characterized in that: In step S1, a plasma cutting method is used to cut and blank the flat stainless steel plate to form a group of fan-shaped flat spliced ​​blanks, and the size of the fan-shaped flat spliced ​​blanks has a press-forming margin.

3. The method for press-joining a bell-mouth stainless steel cylinder according to claim 1, characterized in that: In step S2, the planar spliced ​​blank formed by cutting is placed in a heating furnace for heating and heat preservation so that its temperature distribution is uniform to improve its elongation.

4. The method for press-joining a bell-mouth stainless steel cylinder according to claim 1, characterized in that: In step S3, the heated flat-surface spliced ​​blank is taken out and quickly placed on the pressing die of the pressing machine. The position is adjusted and the pressing machine is started so that the pressing punch slowly falls onto the flat-surface spliced ​​blank for precise pressing to form a curved-surface spliced ​​blank. After pressing, the blank is kept at a temperature not lower than 800°C for 30 minutes to prevent the curved-surface spliced ​​blank from rebounding.

5. The method for press-joining a bell-mouth stainless steel cylinder according to claim 4, characterized in that: In step S3, after the forming is completed, a sample is used to detect whether the profile of the trumpet-shaped stainless steel cylinder product meets the design requirements. If there is a deviation between the profile and the design, grinding and shaping are performed.

6. The method for press-joining a bell-mouth stainless steel cylinder according to claim 4, characterized in that: In step S3, during the pressing process, the pressing effect is observed in real time, and the temperature of the curved surface spliced ​​blank is measured and maintained for 30 minutes. If the temperature is lower than 800°C, the pressing needs to be stopped and the mold needs to be opened again after the mold is completely cooled to prevent the curved surface spliced ​​blank from rebounding.

7. The method for press-joining a bell-mouth stainless steel cylinder according to claim 1, characterized in that: In step S4, groove processing is performed on the curved surface spliced ​​blank after the pressing process; The curved surface spliced ​​blanks are assembled to form a trumpet-shaped stainless steel cylinder assembly that meets the design intention.

8. The method for press-joining a bell-mouth stainless steel cylinder according to claim 1, characterized in that: In step S5, the trumpet-shaped stainless steel cylinder assembly is positioned using a strong constraint tool, and is welded in a symmetrical welding sequence to form a trumpet-shaped stainless steel cylinder finished product.

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