Oil tank end cover and necking device for machining oil tank end cover

Abstract

The utility model relates to the technical field of square oil tanks of automobiles, in particular to an oil tank end cover and a necking device for machining the oil tank end cover. The oil tank end cover comprises an end cover body, a welding lap joint section and a guide section, at least two flow guide notches are formed in the guide section of the oil tank end cover, the flow guide notches can improve the material fluidity of the guide section in the necking process, the possibility of local deformation caused by unsmooth material flowing is reduced, and the necking machining quality of the oil tank end cover is effectively improved. The necking device can conduct necking processing on the oil tank end cover, shape correction is conducted on springback caused in the stretching process of the oil tank end cover, the purpose of controlling deformation of the end cover in the necking process is achieved, and the necking processing quality of the oil tank end cover is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile square fuel tanks, in particular to a fuel tank end cover and a shrinking device used for processing the fuel tank end cover. Background Art

[0002] To increase fuel tank capacity within the limited chassis space, new energy light trucks utilize a square fuel tank. Made from thin stainless steel sheets with a thickness of 0.8-1.2mm, the tank consists of a cylinder and two end caps, which are welded to the cylinder. During processing, to ensure proper rolling and welding of the cylinder, the ends of the cylinder cannot be tapered; only the end caps are tapered.

[0003] The current fuel tank end cover includes an end cover body, a welding overlap section and a guide section. The guide section is a hollow structure. The welding overlap section is arranged in the middle of the end cover body, and the guide section is arranged in the middle of the welding overlap section. The size of the cross-sectional shape of the welding overlap section is smaller than the size of the cross-sectional shape of the end cover body, the size of the cross-sectional shape of the guide section is smaller than the size of the cross-sectional shape of the welding overlap section, and the size of the cross-sectional shape of the guide section gradually decreases from the inner end to the outer end of the guide section. The guide section is provided to facilitate the assembly of the end cover and the cylinder. Since the side lengths of the welding overlap section and the guide section are relatively long, they are severely deformed during the shrinking process, especially the material at the surface-to-surface connection cannot flow during the shrinking process, resulting in distortion and deformation, which affects the shrinking processing quality of the fuel tank end cover. Utility Model Content

[0004] The technical problem solved by the utility model is to provide an oil tank end cover with good shrinkage processing quality.

[0005] The technical solution adopted by the utility model to solve its technical problems is: the oil tank end cover includes an end cover body, a welding overlap section and a guide section, the guide section is a hollow structure, the welding overlap section is arranged in the middle of the end cover body, the guide section is arranged in the middle of the welding overlap section, the size of the cross-sectional shape of the welding overlap section is smaller than the size of the cross-sectional shape of the end cover body, the size of the cross-sectional shape of the guide section is smaller than the size of the cross-sectional shape of the welding overlap section, and the size of the cross-sectional shape of the guide section gradually decreases from the inner end to the outer end of the guide section, and at least two diversion gaps are arranged on the guide section.

[0006] Furthermore, the center axes of the end cover body, the welding overlap section and the guide section are on the same straight line.

[0007] Furthermore, the cross-section of the welded overlap section is a rectangle, and two adjacent sides of the rectangle of the welded overlap section are connected by an arc transition;

[0008] The cross-sectional shape of the guide section is a rectangle, and two adjacent sides of the rectangle of the guide section are connected by arc transitions. The four arcs of the welding overlap section correspond one to one with the four arcs of the guide section in position. Four diversion gaps are provided in the guide section, and the four diversion gaps are respectively located in the four arcs in the guide section.

[0009] Furthermore, the guide notch is located in the middle of the corresponding arc, and the innermost point of the guide notch is on the outer surface of the weld overlap section.

[0010] Furthermore, in a guide gap, the innermost point of the guide gap and the outermost points on both sides thereof are connected by arc transitions.

[0011] In addition, the technical problem solved by the utility model is to provide a fuel tank end cover with good shrinkage processing quality.

[0012] The above-mentioned shrinking device of the oil tank end cover includes a positioning plate, a pressing piece, a shrinking inner mold and a shrinking outer mold. The positioning plate can be connected to the main shaft of the machine tool through a first fastener. A positioning groove for placing the oil tank end cover is provided in the middle of the positioning plate. The pressing piece can be connected to the pressing cylinder through a second fastener. The pressing piece can removably press the oil tank end cover in the positioning groove. The shrinking inner mold can be connected to the longitudinal movable platform through a third connecting piece, and the longitudinal movable platform can move the shrinking inner mold up and down. The shrinking outer mold can be connected to the transverse movable platform through a fourth connecting piece, and the transverse movable platform can move the shrinking outer mold left and right. The shrinking cavity is between the shrinking inner mold and the shrinking outer mold.

[0013] Preferably, the bottom surface and the side surface of the positioning groove are connected by an arc transition, and the height of the straight section of the side surface is not greater than 5 mm.

[0014] Preferably, the pressing member is in the shape of an I-beam.

[0015] The beneficial effects of the present invention are as follows: by providing at least two guide notches on the guide section of the fuel tank end cap, the guide notches can improve the material flowability of the guide section during the shrinking process, reduce the possibility of local deformation caused by poor material flow, and effectively improve the shrinking quality of the fuel tank end cap. The shrinking device of the present invention can shrink the fuel tank end cap and correct the springback caused by the stretching process of the fuel tank end cap, thereby achieving the purpose of controlling deformation of the end cap during the shrinking process and further improving the shrinking quality of the fuel tank end cap. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the main view of the fuel tank end cover;

[0017] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0018] Figure 3 1 is a top view schematic diagram of the fuel tank end cover;

[0019] Figure 4 yes Figure 3 Middle B-direction view;

[0020] Figure 5 It is a schematic diagram of the necking processing device;

[0021] Marked as: end cover body 1, welding overlap section 2, guide section 3, guide notch 4, positioning plate 5, pressing piece 6, necking inner mold 7, necking outer mold 8, first fastener 9. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] like Figures 1 to 4 As shown, the fuel tank end cover of the present invention includes an end cover body 1, a welding overlap section 2 and a guide section 3. The guide section 3 is a hollow structure. The welding overlap section 2 is arranged in the middle of the end cover body 1, and the guide section 3 is arranged in the middle of the welding overlap section 2. The cross-sectional shape of the welding overlap section 2 is smaller than the cross-sectional shape of the end cover body 1, and the cross-sectional shape of the guide section 3 is smaller than the cross-sectional shape of the welding overlap section 2. The cross-sectional shape of the guide section 3 gradually decreases from the inner end to the outer end of the guide section 3, and at least two guide notches 4 are provided on the guide section 3.

[0024] By providing at least two guide notches 4 on the guide section 3 of the fuel tank end cover, the guide notches 4 can improve the material fluidity of the guide section 3 during the shrinking process, reduce the possibility of local deformation due to uneven material flow, and effectively improve the shrinking processing quality of the fuel tank end cover.

[0025] Specifically, in order to further improve the shrinkage processing quality of the fuel tank end cover and improve the use effect of the fuel tank end cover, the center axes of the end cover body 1, the welding overlap section 2 and the guide section 3 are on the same straight line.

[0026] The end cap body 1, welded lap section 2, and guide section 3 are generally identical in shape, though their sizes decrease in sequence. This arrangement facilitates simultaneous insertion and welding of the tank end cap onto the tank body. Since the tank is square overall, the welded lap section 2 has a rectangular cross-section, with two adjacent sides of the rectangle connected by a circular arc transition. The guide section 3 also has a rectangular cross-section, with two adjacent sides of the rectangle connected by a circular arc transition. The four arcs of the welded lap section 2 correspond one-to-one with the four arcs of the guide section 3. Four diversion notches 4 are provided in the guide section 3, each located within one of the four arcs of the guide section 3.

[0027] To enhance the effectiveness of the guide notch 4, it is located in the center of the corresponding circular arc, with the innermost point of the notch 4 on the outer surface of the welded overlap section 2. This arrangement reduces the risk of cracking due to stress concentration caused by shape changes at the notch 4 during the shrinking process. Furthermore, within a guide notch 4, the innermost point of the notch 4 is connected to the outermost points on either side by a circular arc transition, thereby improving the material flowability of the guide section during the shrinking process and reducing the possibility of local deformation caused by poor material flow.

[0028] like Figure 5 As shown, the shrinking device for processing the above-mentioned oil tank end cover includes a positioning plate 5, a pressing member 6, a shrinking inner mold 7 and a shrinking outer mold 8. The positioning plate 5 can be connected to the main shaft of the machine tool through a first fastener 9. A positioning groove for placing the oil tank end cover is provided in the middle of the positioning plate 5. The pressing member 6 can be connected to the pressing cylinder through a second fastener. The pressing member 6 can detachably press the oil tank end cover in the positioning groove. The shrinking inner mold 7 can be connected to the longitudinal movable platform through a third connecting member, and the longitudinal movable platform can move the shrinking inner mold 7 up and down. The shrinking outer mold 8 can be connected to the transverse movable platform through a fourth connecting member, and the transverse movable platform can move the shrinking outer mold 8 left and right. The shrinking cavity is between the shrinking inner mold 7 and the shrinking outer mold 8.

[0029] During the shrinking process of the fuel tank end cover, the positioning plate 5 is first connected to the main shaft of the machine tool through the first fastener 9, and then the fuel tank end cover to be processed is placed in the positioning groove, and the pressing piece 6 is connected to the pressing cylinder through the second fastener. The pressing cylinder extends downward to drive the pressing piece 6 to press the fuel tank end cover in the positioning groove; then the shrinking inner mold 7 is connected to the longitudinal movable table through the third connecting piece, and the shrinking outer mold 8 is connected to the transverse movable table through the fourth connecting piece. The longitudinal movable table moves the shrinking inner mold 7 downward, and the transverse movable table moves the shrinking outer mold 8 to the left, so that the forming part of the shrinking inner mold 7 fits the inner surface of the fuel tank end cover where the shrinking position is required, and the forming part of the shrinking outer mold 8 fits the outer surface of the fuel tank end cover where the shrinking position is required. Finally, the main shaft of the machine tool rotates, and the shrinking inner mold 7 and the shrinking outer mold 8 move to shrink the fuel tank end cover.

[0030] The positioning groove is formed integrally through CNC profiling. Its shape aligns with the end cap body 1, while maintaining a certain gap to ensure convenient and quick loading and unloading of the tank end cap. The bottom and side surfaces of the positioning groove are connected by an arc transition. The height of the straight section on the side is no more than 5mm, ensuring that the tank end cap's rebound angle is fully calibrated.

[0031] The forming part of the necking inner mold 7 needs to reduce the angle of the forming part according to the rebound amount. The distance between its bottom surface and the upper surface of the pressing part 6 is 1-2 mm. The forming part of the necking outer mold 8 has the same rebound angle as the necking inner mold 7.

[0032] In order to improve the use effect of the pressing member 6, the pressing member 6 is in an I-shape.

[0033] The shrinking device of the utility model can shrink the end cover of the fuel tank and correct the springback caused by the stretching process of the end cover of the fuel tank, so as to achieve the purpose of controlling the deformation of the end cover during the shrinking process and further improve the shrinking processing quality of the end cover of the fuel tank.

Claims

1. A fuel tank end cover, comprising an end cover body (1), a welding overlap section (2) and a guide section (3), wherein the guide section (3) is a hollow structure, the welding overlap section (2) is arranged in the middle of the end cover body (1), and the guide section (3) is arranged in the middle of the welding overlap section (2), the cross-sectional shape of the welding overlap section (2) is smaller than the cross-sectional shape of the end cover body (1), the cross-sectional shape of the guide section (3) is smaller than the cross-sectional shape of the welding overlap section (2), and the cross-sectional shape of the guide section (3) gradually decreases from the inner end to the outer end of the guide section (3), characterized in that: At least two flow guide notches (4) are provided on the guide section (3).

2. The fuel tank end cover according to claim 1, characterized in that: The center axes of the end cover body (1), the welding overlap section (2) and the guide section (3) are on the same straight line.

3. The fuel tank end cover according to claim 2, characterized in that: The cross-section of the welded lap section (2) is rectangular, and two adjacent sides of the rectangle of the welded lap section (2) are connected by an arc transition; The cross-section of the guide section (3) is rectangular, two adjacent sides of the rectangle of the guide section (3) are connected by arc transitions, the four arcs of the welding overlap section (2) correspond to the four arcs of the guide section (3) in position, and four guide notches (4) are provided in the guide section (3), and the four guide notches (4) are respectively located in the four arcs in the guide section (3).

4. The fuel tank end cover according to claim 3, characterized in that: The guide notch (4) is located in the middle of the corresponding arc, and the innermost point of the guide notch (4) is on the outer surface of the weld overlap section (2).

5. The fuel tank end cover according to claim 4, characterized in that: In a guide gap (4), the innermost point of the guide gap (4) and the outermost points on both sides thereof are respectively connected via circular arc transitions.

6. The necking device for processing the fuel tank end cover according to any one of claims 1 to 5, characterized in that: The invention comprises a positioning plate (5), a pressing member (6), a shrinking inner die (7) and a shrinking outer die (8). The positioning plate (5) can be connected to the main shaft of the machine tool through a first fastener (9). A positioning groove for placing the oil tank end cover is provided in the middle of the positioning plate (5). The pressing member (6) can be connected to the pressing cylinder through a second fastener. The pressing member (6) can detachably press the oil tank end cover into the positioning groove. The shrinking inner die (7) can be connected to the longitudinal moving platform through a third connecting member, and the longitudinal moving platform can move the shrinking inner die (7) up and down. The shrinking outer die (8) can be connected to the transverse moving platform through a fourth connecting member, and the transverse moving platform can move the shrinking outer die (8) left and right. A shrinking cavity is formed between the shrinking inner die (7) and the shrinking outer die (8).

7. The necking device for processing a fuel tank end cover according to claim 6, characterized in that: The bottom surface and the side surface of the positioning groove are connected by an arc transition, and the height of the straight section of the side surface is not greater than 5mm.

8. The necking device for processing a fuel tank end cover according to claim 6, characterized in that: The shape of the pressing piece (6) is an I-shape.

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