A semicircular product welding method

Abstract

The invention discloses a semicircular product welding method, comprising the following steps: S1: processing a semicircular tube, specifically, the semicircular tube can be preliminarily processed by a stretching method, the height of the processed semicircular tube is A, A=D / 2+β, wherein D is the theoretical value of the full circle diameter, β is the springback amount, and the root of the semicircular tube is chamfered; S2: removing the redundant stretched material of the semicircular tube preliminarily processed in S1, and ensuring that the width of the semicircular tube after cutting is B, B=C+2*m; wherein: C=the width of the actual semicircle after the stretching R angle, m=2.0-2.5 times the material thickness; S3: shaping the side of S2, and removing the redundant material, so that the width of the semicircle after forming is E, E=@*D; wherein D is the theoretical value of the full circle diameter, @=0.95-0.98); the height after forming is A: S4: merging the two semicircles processed in step S3 into a round tube by welding. This method ensures that the diameter of two semicircular products does not deform after welding, thereby ensuring that the circular diameter is a full circle.

Description

Technical Field

[0001] The invention relates to the technical field of tubular product production, in particular to a semicircular product welding method. Background Art

[0002] The automobile body-in-white has stamping parts of various shapes. Due to the molding characteristics of the material itself, stamping parts will rebound after molding and need to be reshaped again to meet product requirements. In the shaping process, the product will have multiple materials due to shaping, which affects the size requirements of the product and further affects the subsequent welding and assembly. The phenomenon of multiple materials after shaping generally requires other processes to be added after the shaping process to meet product requirements, which is a certain waste of cost.

[0003] Therefore, a semicircular product welding method is urgently needed. Summary of the invention

[0004] In order to solve the technical problems existing in the background technology, the present invention provides a semicircular product welding method.

[0005] A semicircular product welding method proposed by the present invention comprises the following steps:

[0006] S1: Processing the semicircular tube. Specifically, the semicircular tube can be preliminarily processed by a stretching method. The height of the preliminarily processed semicircular tube is A, A=D / 2+β, where D is the theoretical value of the full circle diameter, β is the springback amount, and the root of the semicircular tube is chamfered;

[0007] S2: Cut off the excess stretched material of the semicircular tube processed in S1, and ensure that the width of the semicircular tube after cutting is B, B = C + 2 * m; where: C = the actual width of the semicircle after stretching R angle, m = 2.0 to 2.5 times the material thickness;

[0008] S3: shaping the side of the semicircular tube cut from S2 and removing the excess material to make the semicircular width E after forming, E = @*D; where D is the theoretical value of the full circle diameter, @ = 0.95-0.98); the height A after forming, A = D / 2 + β, where β = springback;

[0009] S4: The two semicircles processed in step S3 are combined by welding to form a round tube.

[0010] As a further optimized solution of the present invention, the chamfer radius of the semicircle root in step S1 is R, R=8-10 mm.

[0011] As a further optimized solution of the present invention, the value range of β is between 0.2 mm and 0.3 mm.

[0012] As a further optimized solution of the present invention, in step S3, the material mold for shaping the semicircle includes a lower die punch and an upper die punch, wherein the lower die punch has a semicircular convex surface convex upward, and the semicircular convex surface matches the inner side surface of the semicircular tube, and the upper die punch has a semicircular concave surface concave upward, and the semicircular concave surface matches the outer side wall of the semicircular tube.

[0013] As a further optimized solution of the present invention, the lower die punch is provided with a trimming knife, and the blade of the trimming knife is just below the semicircular raised surface. When the upper die punch squeezes the semicircular tube and contacts the semicircular tube surface, the trimming knife completes the trimming of both sides of the semicircular tube.

[0014] As a further optimized solution of the present invention, two groups of trimming knives are provided, and the distance between the blades of the two groups of trimming knives is equal to the semicircle width E after the excess material is cut off in step S3.

[0015] As a further optimized solution of the present invention, the upper die punch includes a first upper die punch and a second upper die punch, and the first upper die punch and the second upper die punch are respectively used to shape the two sides of the semicircular tube, and when the first upper die punch and the second upper die punch are both in contact with the semicircular tube, a deformation distance is formed between the first upper die punch and the second upper die punch.

[0016] As a further optimization scheme of the present invention, in step S4, during the welding process, it is first required that the welding tool surface fastening belt is controlled within ±0.02mm; after the semicircular tube is positioned by the welding tool positioning pin, N points are selected for welding and fixed by resistance welding, and the welding is cooled for 30s after the welding is completed.

[0017] In the present invention, the proposed semicircular product welding method ensures that the diameter of the two semicircular products does not deform after welding, thereby ensuring that the circular diameter is a full circle; avoids the diameter shaping of the two semicircular products after welding together, thereby reducing costs; ensures that there is no gap at the joint after the two semicircular products are welded; and the method can be used for the forming of three-way pipe fittings.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the component after processing in step S1 in an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure after processing in step S2 in an embodiment of the present invention;

[0021] Figure 3 Schematic diagram of the actual structure of the component after processing in step S2 in the embodiment of the present invention

[0022] Figure 4 This is a schematic structural diagram of the production process of step S3 of the present invention;

[0023] Figure 5 This is a schematic structural diagram of the component after processing in step S3 of the present invention;

[0024] Figure 6 This is a schematic actual structural diagram of the product after processing in step S3 of the present invention;

[0025] Figure 7 This is a schematic actual structural diagram of the product after processing in step S4 of the present invention;

[0026] In the figure: 1. Lower die punch; 20. First upper die punch; 21. Second upper die punch; 3. Trimming knife. Detailed implementation manners

[0027] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar symbols represent the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention, and should not be construed as a limitation to the present invention.

[0028] It should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0029] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0032] A semicircular product welding method comprises the following steps:

[0033] S1: Preliminary processing of the semicircular tube. Specifically, the semicircular tube can be preliminarily processed by stretching method. The height of the preliminarily processed semicircular tube is A, A=D / 2+β, where D is the theoretical value of the full circle diameter, β is the springback amount, and the value range of β is between 0.2mm-0.3mm. The root of the semicircular tube is chamfered, and the R angle of the semicircular root is R=8~10mm. Figure 1 As shown;

[0034] S2: Remove the excess stretched material of the semicircular tube processed in S1, cut the semicircular product after stretching, and remove the excess stretched material, but the material at the semicircle must be calculated accurately. The width obtained after cutting the semicircle is B, B = C + 2 * m (where C = the actual width of the semicircle after stretching R angle, which can be calculated by calculating that the length of the semicircle line is equal to the length of the line after stretching with R angle, m = 2.0 to 2.5 times the material thickness) Figure 2 Theoretical indications, Figure 3 Actual schematic diagram;

[0035] S3: Shape the side of the semicircular tube cut from S2 and remove excess material to make the semicircular width E after forming, E = @ * D; where D is the theoretical value of the full circle diameter, @ = 0.95 ~ 0.98); the height after forming A, A = D / 2 + β, where: D is the theoretical value of the full circle diameter, β is the rebound amount, the product after S3 processing is as shown in the figure Figure 5-6 As shown;

[0036] In this process, the material die for shaping the semicircle includes a lower die punch and an upper die punch, wherein the lower die punch has an upwardly convex semicircular convex surface, the semicircular convex surface matches the inner side surface of the semicircular tube, and the upper die punch has an upwardly concave semicircular concave surface, the semicircular concave surface matches the outer side wall of the semicircular tube;

[0037] The lower die punch is provided with a trimming knife, and the blade of the trimming knife is just below the semicircular raised surface. When the upper die punch squeezes the semicircular tube and contacts the semicircular tube surface, the trimming knife completes trimming of both sides of the semicircular tube.

[0038] There are two groups of trimming knives, and the distance between the blades of the two groups of trimming knives is equal to the semicircle width E after the excess material is cut off in step S3;

[0039] The upper die punch includes a first upper die punch and a second upper die punch, and the first upper die punch and the second upper die punch are respectively used to shape the two sides of the semicircular tube, and when the first upper die punch and the second upper die punch are both in contact with the semicircular tube, a deformation distance is formed between the first upper die punch and the second upper die punch;

[0040] like Figure 4 As shown, during the processing, the semicircular tube is first placed on the semicircular raised surface so that the inner wall of the semicircular tube contacts the semicircular raised surface, and then the upper die punch moves downward, and the first upper die punch and the second upper die punch are symmetrical relative to the axis of the semicircular tube. When the first upper die punch and the second upper die punch push the semicircular tube downward and move to complete the pre-bending, during this process, both sides of the semicircular tube touch the trimming knife, and the trimming knife cuts off excess material. Specifically, the cut material must include m in step S2, and also includes excess material after the chamfer R is reshaped;

[0041] S4: The two semicircles processed in step S3 are combined by welding to form a round tube.

[0042] Specifically, in the welding process, the welding tool surface fastening belt is first required to be controlled within ±0.02mm; after the semicircular tube is positioned by the welding tool positioning pin, N points are selected for welding and fixed by resistance welding. After welding, it is cooled for 30s. After cooling, the diameter of the circle is detected by the inspection tool, and the gap gauge is used to detect the gap at the joint. After passing the inspection, another pair of tooling is used to position the product, and the remaining areas that are not welded are welded by brazing, so as to achieve overall welding, and finally the assembly inspection tool is used to inspect the specific product as shown in the figure. Figure 7 shown.

[0043] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A semicircular product welding method, It is characterized in that The steps include: S1: Processing a semicircular tube, wherein the height of the semicircular tube is A, A=D / 2+β, wherein D is the theoretical value of the full circle diameter, β is the springback amount, and the root of the semicircular tube is chamfered; S2: Cut off the excess stretched material of the semicircular tube processed in S1, and ensure that the width of the semicircular tube after cutting is B, B = C + 2 * m; where: C = the actual width of the semicircle after stretching R angle, m = 2.0 to 2.5 times the material thickness; S3: shaping the side of the semicircular tube after cutting in S2, and removing the excess material, so that the width of the semicircle after forming is E, E = @ * D; wherein D is the theoretical value of the full circle diameter, @ = 0.95 ~ 0.98; the height after forming is A; S4: The two semicircles processed in step S3 are combined by welding to form a round tube.

2. The semicircular product welding method according to claim 1, It is characterized in that In step S1, the chamfer radius of the semicircle root is R, R=8-10 mm.

3. The semicircular product welding method according to claim 1, It is characterized in that The value range of β is between 0.2mm and 0.3mm.

4. The semicircular product welding method according to claim 1, It is characterized in that In step S3, the material mold for shaping the semicircle includes a lower die punch and an upper die punch, wherein the lower die punch has a semicircular convex surface convex upward, and the semicircular convex surface matches the inner side surface of the semicircular tube, and the upper die punch has a semicircular concave surface concave upward, and the semicircular concave surface matches the outer side wall of the semicircular tube.

5. The semicircular product welding method according to claim 4, It is characterized in that The lower die punch is provided with a trimming knife, and the blade of the trimming knife is just below the semicircular raised surface. When the upper die punch squeezes the semicircular tube and contacts the semicircular tube surface, the trimming knife completes trimming of both sides of the semicircular tube.

6. According to the semicircular product welding method of claim 5, two groups of trimming knives are provided, and the distance between the blades of the two groups of trimming knives is equal to the semicircle width E after the excess material is cut off in step S3.

7. According to the semicircular product welding method according to claim 4, the upper die punch includes a first upper die punch and a second upper die punch, and the first upper die punch and the second upper die punch are respectively used to shape the two sides of the semicircular tube, and when the first upper die punch and the second upper die punch are both in contact with the semicircular tube, a deformation distance is formed between the first upper die punch and the second upper die punch.

8. The semicircular product welding method according to claim 1, It is characterized in that In step S4, during the welding process, the welding tool surface fastening belt is first required to be controlled within ±0.02 mm; after the semicircular tube is positioned by the welding tool positioning pin, N points are selected for welding and fixed by resistance welding, and cooling is performed for 30 seconds after welding is completed.

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