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

Abstract

The invention relates to the technical field of automobile square oil tanks, 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. According to the necking device, necking machining can be conducted on the oil tank end cover, rebounding caused in the stretching process of the oil tank end cover is corrected, the purpose of controlling deformation of the end cover in the necking process is achieved, and the necking machining quality of the oil tank end cover is further improved.

Description

Technical Field

[0001] The invention 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] In order to increase the fuel tank capacity within the limited chassis space, the new energy light truck adopts a square fuel tank, which is made of 0.8-1.2mm thick thin stainless steel, including a cylinder and end caps at both ends, which are connected to the cylinder by welding. During processing, in order to ensure the cylinder rolling and welding process, the two ends of the cylinder cannot be shrunken, and the shrinkage can only be completed on the end caps.

[0003] The current fuel tank end cover includes an end cover body, a welding overlap section and a guide section, wherein 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 body. 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 twisting and deformation, which affects the shrinking processing quality of the fuel tank end cover. Summary of the invention

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

[0005] The technical solution adopted by the present invention to solve its technical problems is: an oil tank end cover, including 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 along the direction from the inner end to the outer end of the guide section, the size of the cross-sectional shape of the guide section gradually decreases, and at least two guide notches 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-sectional shape 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 an arc transition. The four arcs of the welding overlap section correspond to the four arcs of the guide section in position one by one. Four guide notches are provided in the guide section, and the four guide notches 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 present invention is to provide a tank end cover with better shrinkage processing quality.

[0012] The shrinking device of the above-mentioned oil tank end cover includes a positioning plate, a clamping 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 arranged in the middle of the positioning plate. The clamping piece can be connected to the clamping cylinder through a second fastener. The clamping piece can removably clamp the oil tank end cover in the positioning groove. The shrinking inner mold can be connected to the longitudinal moving platform through a third connecting piece, and the longitudinal moving platform can move the shrinking inner mold up and down. The shrinking outer mold can be connected to the transverse moving platform through a fourth connecting piece, and the transverse moving 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 an I-shape.

[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 cover, the guide notches can improve the material fluidity of the guide section during the shrinking process, reduce the possibility of local deformation caused by unsmooth material flow, and effectively improve the shrinking processing quality of the fuel tank end cover. The shrinking device of the present invention can shrink the fuel tank end cover, and correct the rebound caused by the stretching process of the fuel tank end cover, 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 fuel tank end cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 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 3is a top view schematic diagram of the fuel tank end cover;

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

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

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

[0022] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0023] like Figures 1 to 4 As shown, the oil tank end cover of the present invention comprises 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 size of the cross-sectional shape of the welding overlap section 2 is smaller than the size of the cross-sectional shape of the end cover body 1, the size of the cross-sectional shape of the guide section 3 is smaller than the size of the cross-sectional shape of the welding overlap section 2, and the size of 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 arranged on the guide section 3.

[0024] By providing at least two guide notches 4 on the guide section 3 of the 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 unsmooth material flow, and effectively improve the shrinking processing quality of the 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 shapes of the end cover body 1, the welding overlap section 2 and the guide section 3 are generally the same, but the sizes are reduced successively. This arrangement facilitates the insertion of the oil tank end cover into the cylinder body for welding. Since the oil tank is square as a whole, the cross-sectional shape of the welding overlap section 2 is a rectangle, and two adjacent sides of the rectangle of the welding overlap section 2 are connected by an arc transition; the cross-sectional shape of the guide section 3 is a rectangle, and two adjacent sides of the rectangle of the guide section 3 are connected by an arc transition. The four arcs of the welding overlap section 2 correspond to the four arcs of the guide section 3 in position. Four diversion notches 4 are provided in the guide section 3, and the four diversion notches 4 are respectively located in the four arcs of the guide section 3.

[0027] In order to improve the use effect of the guide gap 4, the guide gap 4 is located in the middle of the corresponding arc, and the innermost point of the guide gap 4 is on the outer surface of the welded overlap section 2. This arrangement reduces the cracking caused by stress concentration due to shape changes during the shrinking process of the guide gap 4. Furthermore, in a guide gap 4, the innermost point of the guide gap 4 and the outermost points on both sides are connected by arc transitions, thereby improving the material fluidity of the guide section during the shrinking process and reducing the possibility of local deformation due to unsmooth 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 clamping piece 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 arranged in the middle of the positioning plate 5. The clamping piece 6 can be connected to the clamping cylinder through a second fastener. The clamping piece 6 can detachably clamp the oil tank end cover in the positioning groove. The shrinking inner mold 7 can be connected to the longitudinal moving platform through a third connecting piece, and the longitudinal moving platform can move the shrinking inner mold 7 up and down. The shrinking outer mold 8 can be connected to the transverse moving platform through a fourth connecting piece, and the transverse moving 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, firstly, the positioning plate 5 is 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, and 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 moving platform through the third connecting piece, and the shrinking outer mold 8 is connected to the transverse moving platform through the fourth connecting piece, the longitudinal moving platform moves the shrinking inner mold 7 downward, and the transverse moving platform moves the shrinking outer mold 8 to the left, so that the molding part of the shrinking inner mold 7 fits with the inner surface of the position where the fuel tank end cover needs to be shrunken, and the molding part of the shrinking outer mold 8 fits with the outer surface of the position where the fuel tank end cover needs to be shrunken, and 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 by CNC profiling as a whole, and its shape is consistent with the shape of the end cover body 1, and a certain gap is reserved to ensure that the tank end cover is easy and quick to load and unload. The bottom and side of the positioning groove are connected by an arc transition, and the height of the side straight section is no more than 5mm, ensuring that the rebound angle of the tank end cover is fully calibrated.

[0031] The molding part of the shrinking inner mold 7 needs to reduce the angle of the molding part according to the rebound amount, and the distance between its bottom surface and the upper surface of the clamping member 6 is 1-2mm. The molding part of the shrinking outer mold 8 has the same rebound angle as the shrinking 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 present invention 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. An oil 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), the guide section (3) is arranged in the middle of the welding overlap section (2), the size of the cross-sectional shape of the welding overlap section (2) is smaller than the size of the cross-sectional shape of the end cover body (1), the size of the cross-sectional shape of the guide section (3) is smaller than the size of the cross-sectional shape of the welding overlap section (2), and the size of 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-sectional shape of the welded overlap section (2) is a rectangle, and two adjacent sides of the rectangle of the welded overlap section (2) are connected by an arc transition; The cross-sectional shape of the guide section (3) is a rectangle, two adjacent sides of the rectangle of the guide section (3) are connected by arc transition, 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 flow guide notch (4) is located in the middle of the corresponding arc, and the innermost point of the flow guide notch (4) is on the outer surface of the welding overlap section (2).

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

6. The shrinking 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 arranged 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 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; and a shrinking cavity is formed between the shrinking inner die (7) and the shrinking outer die (8).

7. The shrinking device for processing the 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 more than 5mm.

8. The shrinking device for processing the 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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