A device for stretching and shaping a vehicle exhaust half shell assembly

Abstract

This utility model relates to the field of automotive parts technology, specifically to a stretching and shaping device for an automotive exhaust half-shell assembly. It includes a stretching mold and a shaping mold. The stretching mold comprises an upper template and a lower template. The upper template is provided with a first punch and a second punch corresponding to a first part and a second part, respectively. The lower template is provided with a first die and a second die corresponding to the first part and the second part, respectively. Multiple limiting posts are provided around the first and second dies on the lower template, limiting the workpiece to be stretched. The upper template is provided with multiple limiting holes matching the limiting posts. The purpose is to address the issue of irregularly shaped products, which are stainless steel deep-drawn and shaped parts. By using stamping CAE analysis technology and employing in-line production, the device calculates the mold design after shaping based on the deformation after stretching, resulting in lower equipment costs and higher raw material utilization.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, specifically to a stretching and shaping device for an automotive exhaust half-shell assembly. Background Technology

[0002] The exhaust cone is a key component in the engine exhaust system. It is usually a conical metal component, some of which have mounting holes, flanges or welded bevels. It is mainly used to guide the direction of exhaust airflow and connect various components of the exhaust system (such as exhaust pipes and mufflers). At the same time, it undertakes the core functions of sealing the airflow and reducing exhaust noise and airflow resistance.

[0003] To achieve the stamping process of the exhaust end cone, a dedicated exhaust end cone stamping die is required. This die is customized according to the specific structural parameters of the exhaust end cone (such as taper, dimensional tolerances, and characteristic structures), and mainly consists of a punch, a die, and a positioning mechanism. The die is driven by a press to apply external force to the metal sheet blank, causing the blank to undergo plastic deformation or separation, thus producing the exhaust end cone prototype and characteristic structures that meet the design requirements in one go or in stages.

[0004] As per the instruction manual Figure 1 As shown, an exhaust end cone housing includes a first part (labeled A1) and a second part (labeled A2). Both the first and second parts are heterogeneous structures, having features such as arcs, protrusions, through holes, and outwardly bulging structures. If the two parts are processed separately, matching molds are required, resulting in high production costs. Summary of the Invention

[0005] In order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide a stretching and shaping device for automotive exhaust half-shell components. After stamping, a combination of the first part and the second part can be obtained. The overall equipment cost is lower and the utilization rate of raw materials is higher.

[0006] The technical solution adopted in this utility model is as follows: The device includes a stretching die and a shaping die. The stretching die stretches the workpiece to be stretched, and the shaping die shapes the stretched workpiece. The stretching die includes an upper template and a lower template. The upper template is provided with a first punch and a second punch corresponding to a first part and a second part, respectively. The lower template is provided with a first die and a second die corresponding to the first part and the second part, respectively. The lower template is provided with a plurality of limiting posts around the first die and the second die, which limit the workpiece to be stretched. The upper template is provided with a plurality of limiting holes that match the plurality of limiting posts.

[0007] Compared with the prior art, the beneficial effects of this utility model are as follows: First, stretch it to a certain angle, then shape it to complete a small-range adjustment; through the above structure, after stamping, an assembly of the first part and the second part can be obtained. After shaping and cutting the assembly, the first part and the second part can be obtained. Compared with producing the first part and the second part separately, the equipment cost is lower and the utilization rate of raw materials is higher. The combination of limiting holes and limiting posts improves the stability of the die during stamping.

[0008] In a preferred embodiment of this utility model, each of the limiting posts has a chamfer on the side near the workpiece to be stretched.

[0009] Beneficial effects: By setting chamfers on the limit posts, multiple chamfers can play a certain guiding role. When feeding, it is only necessary to place the workpiece to be stretched between the limit posts. Even if there is some deviation, it will be aligned with the center due to the chamfers during the pressing process.

[0010] In a preferred embodiment of this utility model, the limiting post is fixedly connected to the sliding block, and the sliding block is provided with a straight groove. The sliding block can be installed on the lower template by bolts passing through the straight groove.

[0011] Beneficial effects: The straight groove provides bolts with horizontal movement space. When installing the mold, the operator can slightly loosen the bolts and then move the entire limiting block back and forth along the straight groove direction to accurately adjust the final position of the limiting post relative to the mold center or product outline; small dimensional tolerances are inevitable in the processing and manufacturing of parts, and the straight groove can accommodate these errors.

[0012] In a preferred embodiment of this utility model, the sliding block and the lower template are also provided with corresponding pin holes.

[0013] Beneficial effects: During installation and debugging, after determining the position of the sliding block, the position of the pin hole is determined on the lower template, and then the pin is inserted into the pin hole. During the stamping process, the bolts in the straight groove make the sliding block more stable.

[0014] In a preferred embodiment of this utility model, the upper template is mounted on the upper mold base, and a hydraulic punch is mounted on the upper mold base.

[0015] Beneficial effect: The hydraulic punch provides downward pressure, achieving the driving force for stretching.

[0016] In a preferred embodiment of this utility model, the upper mold base is provided with a plurality of guide holes, and guide posts are provided in the guide holes. When the upper mold base is stamped, it slides downward along the guide posts.

[0017] Beneficial effects: By setting guide holes and guide pillars, the upper die holder runs more smoothly during the stamping process, resulting in higher precision of the processed products. Attached Figure Description

[0018] Figure 1 These are structural diagrams of the first and second parts; Figure 2 This is a schematic diagram of the structure of the workpiece to be stretched obtained by blanking in an embodiment of the stretching and shaping device for an automotive exhaust half-shell assembly of this utility model. Figure 3 This is a schematic diagram of the stretching mold in an embodiment of the stretching and shaping device for an automotive exhaust half-shell assembly according to this utility model. Figure 4 This is a schematic diagram of the structure of the stretching mold for placing the workpiece to be stretched in an embodiment of the stretching and shaping device for an automotive exhaust half-shell assembly according to this utility model. Figure 5 This is a schematic diagram of the structure of the stretching mold after stretching in an embodiment of the stretching and shaping device for an automotive exhaust half-shell assembly of this utility model. Figure 6 This is a schematic diagram of the shaping mold in an embodiment of the stretching and shaping device for an automotive exhaust half-shell assembly according to this utility model.

[0019] The reference numerals in the drawings include: stretching die 100, upper template 101, lower template 102, first punch 103, second punch 104, first die 105, second die 106, limiting post 107, guide hole 108, pin hole 109, chamfer 110, straight groove 111, forming die 200, workpiece to be stretched 300, first assembly 400, and second assembly 500. Detailed Implementation

[0020] Typical embodiments embodying the features and advantages of this utility model will be specifically described in the following description. It should be understood that this utility model can have various variations in different embodiments, all of which do not depart from the scope of this utility model, and the descriptions and illustrations therein are for illustrative purposes only and not intended to limit this utility model.

[0021] In the description of this application, the terms "first", "second", etc. are used only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the structure referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0022] See Figures 1 to 6As shown, this embodiment discloses a stretching and shaping device for an automotive exhaust half-shell assembly, including a stretching die 100. The stretching die 100 includes an upper template 101 and a lower template 102. The upper template 101 is provided with a first punch 103 and a second punch 104 corresponding to a first part and a second part, respectively. The lower template 102 is provided with a first die 105 and a second die 106 corresponding to the first part and the second part, respectively. The upper template 101 is mounted on an upper die base, and a hydraulic punch is mounted on the upper die base. The hydraulic punch is a hydraulically driven cylinder, and its output pressure can be adjusted within the range of 0-15MPa. The cylinder body of the hydraulically driven cylinder is fixed to the top of the frame (not shown) by a bracket. The end of the piston rod is detachably connected to the flange by screws, so that the driving force is transmitted to the upper die base. The upper die base is provided with a plurality of guide holes 108, and guide posts are provided in the guide holes 108. When the upper die base is stamped, it slides downward along the guide posts.

[0023] Among them, see Figures 3 to 5 The lower template 102 has multiple limiting posts 107 surrounding the first die 105 and the second die 106. The multiple limiting posts 107 limit the workpiece to be stretched. The upper template 101 has multiple limiting holes that match the multiple limiting posts 107. Each limiting post 107 has a chamfer 110 on the side near the workpiece to be stretched. The limiting post 107 is fixedly connected to the sliding block. The sliding block has a straight groove 111. The sliding block can be installed on the lower template 102 by bolts passing through the straight groove 111. The sliding block and the lower template 102 also have corresponding pin holes 109. During installation and debugging, after determining the position of the sliding block, the position of the pin hole 109 is determined on the lower template 102, and a pin is inserted into the pin hole 109. During the stamping process, the bolts in the straight groove 111 make the sliding block more stable.

[0024] Among them, see Figure 6 It also includes a shaping mold 200, which has a corresponding template, mold base, hydraulic punch and guide post. In order to avoid excessive bending of a single layer during stretching, it is first stretched to a certain angle before shaping.

[0025] The working principle and process of this embodiment are as follows: See Figure 2 The workpiece 300 to be stretched can be obtained by punching from a strip of sheet material through blanking. See Figures 3 to 5The workpiece 300 to be stretched is placed on the lower template 102 and positioned by the limiting rod. After the corresponding hydraulic punch is activated, the upper die base and the upper template 101 are moved downward. The first punch 103 and the second punch 104 squeeze the workpiece 300 to be stretched until the workpiece 300 to be stretched is squeezed on the lower template 102. The first punch 103 and the second punch 104 correspond to the first die 105 and the second die 106 to obtain the first assembly 400. See Figure 6 The first assembly 400 is placed in the forming mold 200 and then stamped to obtain the second assembly 500. See Figure 1 In the middle, the protrusion at point A has the shape of the second assembly 500. The second assembly 500 can be cut (by laser cutting, water jet cutting or mold cutting) to obtain the first part and the second part.

[0026] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A stretching and shaping device for an automotive exhaust half-shell assembly, comprising a stretching die (100) and a shaping die (200), wherein the stretching die (100) stretches the workpiece to be stretched, and the shaping die (200) shapes the stretched workpiece, characterized in that: The stretching die (100) includes an upper template (101) and a lower template (102). The upper template (101) is provided with a first punch (103) and a second punch (104) corresponding to the first part and the second part, respectively. The lower template (102) is provided with a first die (105) and a second die (106) corresponding to the first part and the second part, respectively. The lower template (102) is provided with a plurality of limiting posts (107) surrounding the first die (105) and the second die (106). The plurality of limiting posts (107) limit the workpiece (300) to be stretched. The upper template (101) is provided with a plurality of limiting holes that match the plurality of limiting posts (107).

2. The stretching and shaping device for automotive exhaust half-shell assembly according to claim 1, characterized in that: Each of the limiting posts (107) has a chamfer (110) on the side near the workpiece (300) to be stretched.

3. The stretching and shaping device for automotive exhaust half-shell assembly according to claim 1, characterized in that: The limiting post (107) is fixedly connected to the sliding block, which has a straight groove (111). The sliding block can be installed on the lower template (102) by bolts passing through the straight groove (111).

4. The stretching and shaping device for automotive exhaust half-shell assembly according to claim 3, characterized in that: The sliding block and the lower template (102) are also provided with corresponding pin holes (109).

5. The stretching and shaping device for automotive exhaust half-shell assembly according to claim 1, characterized in that: The upper template (101) is mounted on the upper mold base, and a hydraulic punch is mounted on the upper mold base.

6. The stretching and shaping device for automotive exhaust half-shell assembly according to claim 5, characterized in that: The upper die base is provided with multiple guide holes (108), and guide posts are provided in the guide holes (108). When the upper die base is stamped, it slides downward along the guide posts.

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