A rear fender production line for high-end motorcycles and its processing technology

Abstract

The present invention proposes a rear fender production line for high-end motorcycles and its processing technology, including: a drawing die for drawing materials; a trimming die for cutting excess edge materials of the intermediate product of drawing; a flanging die for flanging the intermediate product of drawing; and a shaping die for shaping the raised portion on the intermediate product of drawing; improving the situation in the prior art that the rear fender is prone to cracking after only drawing. The shaping process is used to shape the middle bulge, which ensures the performance and structure of the bulge without affecting the product attributes of the appearance surface. The bulge after shaping has a small R angle, the material is not easy to flow, and the product is not easy to crack.

Description

Technical Field

[0001] The invention relates to the field of motorcycle rear fender processing equipment, and in particular to a rear fender production line for a high-end motorcycle and a processing technology thereof. Background Art

[0002] The rear fenders used in high-end motorcycles are manufactured through multiple molds to form a production line, such as Figure 1 As shown, the product forming process of the rear fender is gradually formed through multiple dies such as a steel plate rolling die, a drawing die, a trimming die and a flanging die, and corresponding forming processing is performed at different stations; in the existing production line, the material plate first enters the drawing die for drawing forming to form an intermediate product, and then the excess material on the edge is trimmed by the flanging die to directly obtain the product; however, the product structure has a raised portion structure at a high point. Since the raised portion is located at a high position and the raised portion has multiple sharp corners (R angle is about 0.5mm) and complex shapes, the material fluidity is poor during the forming process, which is easy to cause cracking and wrinkling after drawing, affecting the function and appearance of the product. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a rear fender production line for high-end motorcycles, which solves the problem in the prior art that the rear fender is prone to cracking and wrinkling after being drawn.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A rear fender production line for high-end motorcycles, comprising:

[0006] Drawing die, used for drawing materials;

[0007] The trimming die is used to trim the excess edge material of the intermediate product during drawing;

[0008] Flanging die, used for flanging the intermediate product of drawing;

[0009] The invention also comprises a shaping die for shaping the raised part on the intermediate product formed by drawing.

[0010] Preferably, the shaping die comprises an upper die and a lower die that cooperate with each other, and the upper die and the lower die are combined to position the intermediate product of the drawing forming;

[0011] The upper die is provided with a shaping die core for positioning the raised portion of the intermediate product;

[0012] The lower die is provided with a shaping punch core for extruding the raised portion of the intermediate product;

[0013] The shaping concave mold core and the shaping convex mold core cooperate to form a shaping mold cavity.

[0014] Preferably, the upper die comprises an upper die base and an upper die core mounted on the upper die base;

[0015] The upper die base is also provided with at least two symmetrically arranged upper nitrogen springs for pushing the upper die core to slide longitudinally;

[0016] The upper die seat is also provided with an upper limit slider for limiting the sliding of the upper die core;

[0017] The shaping die core is installed on the upper die seat, and an upper slide groove for passing the shaping die core is provided on the upper die core.

[0018] Preferably, the lower die comprises a lower die base and a lower die core mounted on the lower die base;

[0019] The lower die base is provided with at least two symmetrically arranged lower nitrogen springs for pushing the lower die core to slide longitudinally;

[0020] The lower die base is also provided with a lower limit slider for limiting the sliding of the lower die core;

[0021] The shaping punch core is installed on the lower die base, and a sliding groove for passing the shaping punch core is provided on the lower die core.

[0022] Preferably, the lower die seat is provided with symmetrically arranged positioning seats and guide rods installed on the positioning seats;

[0023] A guide seat which is slidably matched with the guide rod is installed on the upper die seat.

[0024] Preferably, at least two symmetrically arranged lower positioning rods are installed on the lower die base;

[0025] An upper positioning rod is mounted on the upper die seat and is positioned against the lower positioning rod.

[0026] Preferably, the upper die base and the lower die base are both provided with lifting bearing blocks which are symmetrically arranged in pairs.

[0027] The present invention further proposes a processing technology for a rear fender production line of a high-end motorcycle, comprising the following steps:

[0028] 1) Roll steel plates and cut them into lining blocks;

[0029] 2) Drawing;

[0030] 3) Shaping, edge trimming, first pressing the fender and then shaping, pressing the material and pressing the appearance;

[0031] 4) Trimming

[0032] 5) Flanging and shaping,

[0033] Flanging: Flanging the two long edges; Shaping: Shaping the bulge in the middle;

[0034] 6) Punch holes. Punch the mounting holes. First, punch the holes connected to the seat in a forward direction, and then punch the taillight mounting holes and the frame steel pipe connection holes diagonally.

[0035] Preferably, the deformation rate during drawing is within 20%.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] 1. Adding a shaping die to shape the raised parts on the intermediate product in the process after drawing can effectively solve the deformation and wrinkling caused by direct drawing, and at the same time avoid the situation where the drawing is completed in one go and the cracking of the raised parts; by improving the entire model processing production line, the structural strength and mechanical properties of the raised parts can be guaranteed.

[0038] 2. The shaping process is used to shape the middle bulge, which ensures the performance and structure of the bulge without affecting the product attributes of the appearance. The bulge after shaping has a small R angle, the material is not easy to flow, and the product is not easy to crack. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a diagram showing the rear fender molding process;

[0040] Figure 2 The exploded structure diagram of the plastic mold;

[0041] Figure 3 It is a structural schematic diagram of the lower mold;

[0042] Figure 4 It is a structural schematic diagram of the upper die;

[0043] In the figure,

[0044] Upper die 1, upper die seat 11, upper die core 12, upper nitrogen spring 13, upper limit slider 14, upper slide groove 15, lower die 2, lower die seat 21, lower die core 22, lower nitrogen spring 23, lower limit slider 24, lower slide groove 25, shaping die core 3, shaping punch core 4, positioning seat 5, guide rod 6, guide seat 7, lower positioning rod 8, upper positioning rod 9, lifting bearing block 10. DETAILED DESCRIPTION

[0045] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0046] In an embodiment of the present invention, a rear fender production line for a high-end motorcycle is proposed, which includes a drawing die, a trimming die, a flanging die, etc. Before the drawing die is processed, a steel plate die is required to prepare the material. After the material is transported to the drawing die, it is drawn and formed to form the preliminary outline of the entire rear fender; then the intermediate product of the drawing and forming is cut with excess edge material through a trimming die, and finally the intermediate product that has been cut with edge material is flanging formed through a flanging die, thereby completing the entire rear fender production process; however, in the current forming process, the forming of the raised part in the rear fender is mainly achieved by a drawing die. Since the raised part is located at a higher position and has a smaller rounded corner, it is easy to crack after one-time forming. In order to improve the above problem, a shaping die for shaping the raised part on the intermediate product is added after the drawing and forming, thereby improving the mechanical properties and structural strength of the raised part.

[0047] Specifically, Figure 2 to Figure 4 As shown, the shaping mold includes an upper mold 1 and a lower mold 2 that cooperate with each other, and the intermediate product formed by drawing is positioned after the upper mold 1 and the lower mold 2 are molded together. The shaping is mainly performed on the raised part, so the intermediate product needs to be reliably positioned before shaping without causing damage to the already formed structure. Therefore, the intermediate product needs to be fit and positioned by the upper mold 1 and the lower mold 2; a shaping die core 3 for positioning the raised part of the intermediate product is provided on the upper mold 1, and a shaping punch core 4 for squeezing the raised part of the intermediate product is provided on the lower mold 2, so that the shaping die cavity is formed by the shaping die core 3 and the shaping punch core 4; after the upper mold 1 and the lower mold 2 are molded together, the raised part is pressed and shaped by the shaping die core 3 and the shaping punch core 4, so that the raised part can be locally shaped without causing structural damage to the already formed part.

[0048] Among them, the upper die 1 includes an upper die base 11 and an upper die core 12 installed on the upper die base 11, and the upper die base 11 is also equipped with at least two symmetrically arranged upper nitrogen springs 13 for pushing the upper die core 12 to slide longitudinally; at the same time, the upper die base 11 is also provided with an upper limit slider 14 for limiting the sliding of the upper die core 12; and the shaping die core 3 is installed on the upper die base 11, and the upper die core 12 is provided with an upper slide groove 15 for passing through the shaping die core 3; and the lower die 2 includes a lower die base 21 and a lower die core 22 installed on the lower die base 21; and at least two symmetrically arranged and used upper nitrogen springs 13 are installed on the lower die base 21. A lower nitrogen spring 23 is provided to push the lower die core 22 to slide longitudinally; at the same time, a lower limit slider 24 is also provided on the lower die base 21 for limiting the sliding of the lower die core 22; specifically, the shaping punch core 4 is installed on the lower die base 21, and the lower die core 22 is provided with a lower sliding groove 25 for passing the shaping punch core 4; the upper die core 12 and the lower die core 22 cooperate with each other to reliably position the intermediate product, and then the shaping concave die core 3 and the shaping punch core 4 cooperate to shape the raised part; after the shaping is completed, the upper die core 12 is pushed to move by the upper nitrogen spring 13, and the lower die core 22 is pushed to move by the lower nitrogen spring 23 to achieve demolding.

[0049] In order to achieve a stable guiding process when the upper mold base 11 and the lower mold base 21 approach each other, a symmetrically arranged positioning seat 5 and a guide rod 6 installed on the positioning seat 5 are installed on the lower mold base 21; and a guide seat 7 that slides with the guide rod 6 is installed on the upper mold base 11; through the sliding cooperation between the guide seat 7 and the guide rod 6, the function of limiting guidance is realized in the process of the upper mold 1 moving downward, thereby ensuring an accurate mold closing process.

[0050] At the same time, in order to limit the relative movement distance between the lower die base 21 and the upper die base 11, at least two symmetrically arranged lower positioning rods 8 are installed on the lower die base 21; an upper positioning rod 9 is installed on the upper die base 11 to be positioned against the lower positioning rod 8. After the upper die base 11 and the lower die base 21 are close to each other, the upper positioning rod 9 and the lower positioning rod 8 are used to limit the relative movement position to avoid damage to the already formed structure due to excessive force.

[0051] At the same time, in order to facilitate the lifting of the upper die 1 and the lower die 2, lifting bearing blocks 10 symmetrically arranged in pairs are installed on the upper die base 11 and the lower die base 21.

[0052] The invention also proposes a processing technology for a rear fender production line of a high-end motorcycle, comprising the following steps:

[0053] 1) Roll steel plates and cut them into lining blocks;

[0054] 2) Drawing;

[0055] 3) Shaping, edge trimming, first pressing the fender and then shaping, pressing the material and pressing the appearance;

[0056] 4) Trimming

[0057] 5) Flanging and shaping,

[0058] Flanging: Flanging the two long edges; Shaping: Shaping the bulge in the middle;

[0059] 6) Punch holes. Punch the mounting holes. First, punch the holes connected to the seat in a forward direction, and then punch the taillight mounting holes and the frame steel pipe connection holes diagonally.

[0060] Preferably, the deformation rate during drawing is within 20%, and no cracking or wrinkling is allowed.

[0061] The middle bulge is shaped by a shaping process, which ensures the performance and structure of the bulge without affecting the product attributes of the appearance. The bulge after shaping has a small R angle, the material is not easy to flow, and the product is not easy to crack.

[0062] Design the optimal pre-forming surface for the convex part of the drawing and shaping process, through which the material can be guided to the corner area where the material is not easy to flow. If the material flows too much, it will wrinkle, affecting the appearance of the commodity. If the material flows too little, it will crack, affecting the function of the product. Therefore, it is necessary to accurately calculate the volume of the convex part based on the principle of constant volume, reversely calculate and design the pre-forming surface, and protect and limit the material flow of the appearance surface in other areas except the convex area to a certain extent by pre-pressing other appearance surfaces, so as to avoid the orange peel or ripple effect caused by uneven material flow on the product surface, which affects the product appearance.

[0063] In the description of the present invention, it is necessary to understand that the terms indicating orientation or positional relationship are 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 cannot be understood as a limitation on the present invention.

[0064] 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 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, it can be the internal connection of two elements or the interaction relationship between 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.

[0065] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. The processing technology of the rear fender production line of high-end motorcycles is adopted, which is characterized by: The following steps are involved: 1) Roll steel plates and cut them into lining blocks; 2) Drawing: Use a drawing die to draw the material to form the initial outline of the entire rear fender; 3) Shaping, edge trimming, first pressing the fender and then shaping, pressing the material and pressing the appearance surface; 4) Trimming: using trimming dies to trim excess edge material of the intermediate product after drawing; 5) Flanging and shaping, Flanging: Flanging the two long edges; Shaping: straighten the middle bulge; use the flanging die to flanging the intermediate product of the drawing forming; use the shaping die to shape the bulge on the intermediate product of the drawing forming; 6) Punching holes, punching mounting holes, first punching the holes connected to the seat in a forward direction, and then punching the taillight mounting holes and the frame steel pipe connection holes in an oblique direction; The shaping mold comprises an upper mold (1) and a lower mold (2) that cooperate with each other, and the upper mold (1) and the lower mold (2) are molded together to position the intermediate product after drawing; The upper die (1) is provided with a shaping die core (3) for positioning the raised portion of the intermediate product; The lower die (2) is provided with a shaping punch (4) for extruding the raised portion of the intermediate product; The shaping die core (3) and the shaping punch core (4) cooperate to form a shaping die cavity; The upper die (1) comprises an upper die base (11) and an upper die core (12) mounted on the upper die base (11); The upper die base (11) is also provided with at least two symmetrically arranged upper nitrogen springs (13) for pushing the upper die core (12) to slide longitudinally; The upper die base (11) is also provided with an upper limit slider (14) for limiting the sliding movement of the upper die core (12); The shaping die core (3) is mounted on the upper die base (11), and an upper slide groove (15) for the shaping die core (3) to pass through is provided on the upper die core (12); The lower die (2) comprises a lower die base (21) and a lower die core (22) mounted on the lower die base (21); The lower die base (21) is provided with at least two symmetrically arranged lower nitrogen springs (23) for pushing the lower die core (22) to slide longitudinally; The lower die base (21) is also provided with a lower limit slider (24) for limiting the sliding movement of the lower die core (22); The shaping punch (4) is mounted on the lower die base (21); the lower die base (22) is provided with a lower slide groove (25) for the shaping punch (4) to pass through; the lower die base (21) is provided with a symmetrically arranged positioning seat (5) and a guide rod (6) mounted on the positioning seat (5); A guide seat (7) is mounted on the upper die seat (11) and is slidably matched with the guide rod (6); At least two symmetrically arranged lower positioning rods (8) are mounted on the lower die base (21); An upper positioning rod (9) is mounted on the upper die seat (11) and is positioned against the lower positioning rod (8).

2. The processing technology according to claim 1, characterized in that: The upper die base (11) and the lower die base (21) are both provided with lifting bearing blocks (10) symmetrically arranged in pairs.

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