Production process for deep drawing and integral forming of a thin-walled aluminum inner liner of a car refrigerator with an asymmetric demolding angle
Through the step of stretching and swelling, the asymmetrical demolding angle thin-walled aluminum inner liner of the vehicle refrigerator is used to form an oval piece, which solves the problems of many production processes and high costs in traditional processes, and achieves efficient and low-cost production.
Patent Information
- Application Number
- CN202411933274.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2044-12-26
AI Technical Summary
The prior art is difficult to effectively produce thin-walled aluminum inner liner of vehicle-mounted refrigerators with inconsistent demoulding angles and asymmetrical, and traditional processes have problems of many production processes and high costs.
The oval piece is used for stretching in stages, combining steps such as swelling and shaping, and floating molding is achieved through hard die or soft rubber punches under the limitation of the die, so as to achieve integrated molding of thin-walled aluminum inner liner with an asymmetric angle.
The efficient molding of asymmetric mold release angle thin-walled aluminum inner liner is achieved, reducing production processes, reducing costs and shortening production cycles.
Smart Images
Figure CN119525346B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a production process for an aluminum inner liner of a vehicle-mounted refrigerator, and particularly to a production process for a thin-walled aluminum inner liner of a vehicle-mounted refrigerator with an asymmetric demolding angle. Background Art
[0002] The forming production process of the aluminum inner liner of a vehicle-mounted refrigerator is generally divided into stretch forming or bending and welding forming.
[0003] When using the stretch forming production process, there are certain requirements for the shape of the aluminum inner liner. For example, the demolding angle is preferably 0 degree and the demolding angle of each surface is the same, which limits the product shape space.
[0004] When using the bending and welding forming production process, compared with the stretch forming production process, the welding process and the grinding process are added, and the manufacturing cost and cycle are lower than those of the stretch forming production process.
[0005] For the thin-walled aluminum inner liner with inconsistent and asymmetric demolding angles, the above two production processes cannot effectively achieve production or have more processes. Summary of the Invention
[0006] Object of the Invention: Aiming at the above problems, the object of the present invention is to provide a production process for a thin-walled aluminum inner liner of a vehicle-mounted refrigerator with an asymmetric demolding angle, which can not only adapt to the shape of the thin-walled aluminum inner liner with inconsistent and asymmetric demolding angles, but also relatively reduce the production processes.
[0007] Technical Solution: A deep drawing and integral forming production process for a thin-walled aluminum inner liner of a vehicle-mounted refrigerator with an asymmetric demolding angle, comprising the following steps:
[0008] S10: Blanking the sheet, and the shape of the sheet is oval;
[0009] S20: Stretching, stretching the sheet into a cuboid with an open bottom end;
[0010] S30: Bulging, bulging a group of short side wall surfaces of the cuboid to expand their angles, and forming asymmetric angles on the two short side wall surfaces, and forming a first step at the open bottom end;
[0011] S40: Shaping, shaping the angles of the four side wall surfaces of the cuboid and the first step, completing the forming of the side wall surface angles, and sharpening the R angle of the first step;
[0012] S50: Trimming, trimming the outer edge of the first step to make the circumferential width of the first step equal;
[0013] S60: Flanging, flanging downward at a set position on the first step to form a second step;
[0014] S70: Mouth shaping, shaping the mouth of the second step;
[0015] S80: Side punching, where punching holes are respectively formed on the second step corresponding to the four side wall surfaces.
[0016] Furthermore, step S20 is achieved through three stretches, including:
[0017] S201: First stretch, stretching the sheet into a cylinder with an oval plane at the top and a circular opening at the bottom. During the stretching process, the short axis direction of the top oval is the same as the long axis direction of the oval of the sheet, the long axis direction of the top oval is the same as the short axis direction of the oval of the sheet, and both sides in the long axis direction of the top oval plane taper downwards towards the bottom.
[0018] S202: Second stretch, continuously stretching the cylinder to increase its height and reduce its wall thickness, and stretching it into a cylinder with a rectangular plane at the top and an oval opening at the bottom. During the stretching process, the length direction of the top rectangle is the same as the long axis direction of the top oval, the width direction of the top rectangle is the same as the short axis direction of the top oval, the circular opening at the bottom transitions to an oval, the long axis direction of the oval opening at the bottom is the same as the length direction of the top rectangle, the short axis direction of the oval opening at the bottom is the same as the width direction of the top rectangle, and the tapered surfaces on both sides at the top become smaller.
[0019] S203: Third stretch, continuously stretching the cylinder to increase its height and reduce its wall thickness, and stretching it into a cuboid with a rectangular plane at the top and a rectangular opening at the bottom. During the stretching process, the length and width of the top rectangle become smaller.
[0020] Furthermore, the oval opening at the bottom in step S202 is the same as the oval at the top in step S201, and the rectangles at the top and bottom openings in step S203 are the same as the rectangle at the top in step S202.
[0021] Furthermore, the thickness t of the sheet is 1 mm, the stretch ratio of the first stretch is 0.65, the stretch ratio of the second stretch is 0.85 in length and 0.62 in width, and the stretch ratio of the third stretch is 0.85 in length and 0.75 in width.
[0022] Furthermore, in step S30, the outward expansion angle of the short side wall surface after bulging is not more than 5°.
[0023] Furthermore, in step S30, the convex die of a hard die or a punch made of soft rubber expands and forms from the inner cavity of the workpiece outwards, and the concave die controls the shape of the workpiece.
[0024] Furthermore, the material of the sheet is Al 1100.
[0025] Beneficial effects: The advantages of the present invention are as follows: For the structure of the thin-walled aluminum inner liner of a vehicle-mounted refrigerator with an asymmetric demolding angle, an oval blank is used for stretching to facilitate the material flow during the stretching process and avoid problems such as material accumulation and wrinkles. The oval blank is stretched into a cuboid through multiple stretches. During the bulging step, the punch floats under the restriction of the die, and the specified side wall surface of the workpiece is expanded to a specified angle. The entire production process forms the blank into a product integrally, which can replace the split welding production process, ensuring both the consistency of the product and reducing the production cost and shortening the production cycle. Description of the Drawings
[0026] Figure 1 Schematic diagram of the product changes under the production process of this application;
[0027] Figure 2 Schematic diagram of the product changes through three stretches in step S20. Detailed Embodiments
[0028] The present invention will be further illustrated below in conjunction with the drawings and specific embodiments.
[0029] A deep drawing and integral forming production process for the thin-walled aluminum inner liner of a vehicle-mounted refrigerator with an asymmetric demolding angle specifically includes steps S10 to S80. The changes of the product in each step are as shown in the attached Figure 1 、 2 figures. The red lines in the figures represent the changed parts of the product in each step.
[0030] S10: Blanking blank, punching and blanking on an Al 1100 sheet to obtain a blank, and the shape of the blank is oval.
[0031] S20: Stretching, stretching the blank into a cuboid with an open bottom, which is achieved through three stretches, specifically including steps S201 to S203.
[0032] S201: First stretch, stretching the blank into a cylinder with an oval plane at the top and a circular opening at the bottom. During the stretching process, the short axis direction of the top oval is the same as the long axis direction of the oval of the blank, the long axis direction of the top oval is the same as the short axis direction of the oval of the blank, and both sides of the long axis direction of the top oval plane are tapered downward to the bottom; the workpiece obtained in this step is an axisymmetric structure, symmetric about the long axis direction of the top oval plane and symmetric about the short axis direction.
[0033] S202: Secondary stretching. The cylinder is further stretched to increase its height and reduce its wall thickness, and is stretched into a cylinder with a rectangular plane at the top and an elliptical opening at the bottom. The elliptical opening at the bottom in this step is the same as the elliptical opening at the top in step S201. During the stretching process, the length direction of the rectangular shape at the top is the same as the major axis direction of the elliptical opening at the top, and the width direction of the rectangular shape at the top is the same as the minor axis direction of the elliptical opening at the top. The circular opening at the bottom transitions to an ellipse, and the major axis direction of the elliptical opening at the bottom is the same as the length direction of the rectangular shape at the top, and the minor axis direction of the elliptical opening at the bottom is the same as the width direction of the rectangular shape at the top. The conical surfaces on both sides at the top become smaller. The workpiece obtained by stretching in this step is an axisymmetric structure, symmetric about the major axis direction of the rectangular plane at the top and symmetric about the minor axis direction.
[0034] S203: Tertiary stretching. The cylinder is further stretched to increase its height and reduce its wall thickness, and is stretched into a cuboid with a rectangular plane at the top and a rectangular opening at the bottom. The rectangular shapes at the top and the bottom opening in this step are the same as the rectangular shape at the top in step S202. During the stretching process, the length and width of the rectangular shape at the top become smaller. The workpiece obtained by stretching in this step is an axisymmetric structure, symmetric about the major axis direction of the rectangular plane at the top and symmetric about the minor axis direction.
[0035] S30: Bulging. One group of short side wall surfaces of the cuboid is bulged to expand the angle outward, and the outward expansion angles of the short side wall surfaces on both sides are different, forming an asymmetric angle designed for the product. The outward expansion angle after bulging is not more than 5°, and a first step is formed at the bottom opening. In this step, the shape of the workpiece is controlled by the female die, a hard die or a soft rubber punch is used as the male die, and the expansion molding is carried out from the inner cavity of the workpiece outward. The male die can float and change; the male die and the female die are made according to the product design. Figure 1 The arrows in step S30 indicate the outward expansion directions of the short side wall surfaces on both sides.
[0036] S40: Shaping. The angles of the four side wall surfaces of the cuboid and the first step are shaped, and the side wall surface angles are formed. Then, the R angle of the first step is sharpened. This step can be completed by one or two shaping operations.
[0037] S50: Trimming. The outer edge of the first step is trimmed to make the circumference of the first step of equal width.
[0038] S60: Flanging. Flanging is carried out downward at a set position on the first step to form a second step.
[0039] S70: Mouth shaping. The mouth of the second step is shaped.
[0040] S80: Side punching. Punching holes are respectively formed on the second step corresponding to the four side wall surfaces, and the asymmetric demolding angle thin-walled aluminum inner liner product of the car refrigerator is obtained.
[0041] Calculate the size of the elliptical blank according to the actual shape of the product. The stretching steps are designed according to the actual size of the product and the material stretching ratio. For example, the thickness t of the blank is 1 mm, the stretching ratio of the first stretching is 0.65, the stretching ratio of the second stretching is 0.85 in length and 0.62 in width, and the stretching ratio of the third stretching is 0.85 in length and 0.75 in width.
[0042] In view of the structure of the thin-walled aluminum inner liner product of the vehicle-mounted refrigerator with an asymmetric demolding angle, the present application uses an elliptical blank for stretching to facilitate the material flow during stretching molding and avoid problems such as material accumulation and wrinkles. The elliptical blank is stretched into a cuboid through multiple stretches. In the bulging step, the punch floats under the restriction of the die, and the specified side wall surface of the workpiece is expanded to a specified angle. The entire production process forms the blank into a product integrally, which can replace the split welding production process, ensuring both the consistency of the product and reducing the production cost and shortening the production cycle.
Claims
1. A deep drawing and integrated forming production process for an asymmetric demolding angle thin-walled aluminum inner liner of a vehicle-mounted refrigerator, characterized in that It includes the following steps: S10: Blanking the blank, the shape of the blank is oval; S20: Stretching, stretching the blank into a cuboid with an open bottom end; S30: Bulging, bulging a set of short side wall surfaces of the cuboid to expand their angles, and the short side wall surfaces on both sides form asymmetric angles, and a first step is formed at the open bottom end; S40: Shaping, shaping the angles of the four side wall surfaces of the cuboid and the first step, completing the forming of the side wall surface angles, and the R angle of the first step is sharpened; S50: Trimming, trimming the outer edge of the first step to make the circumference of the first step of equal width; S60: Flanging, flanging downward at a set position on the first step to form a second step; S70: Mouth shaping, shaping the mouth of the second step; S80: Side punching, forming punching holes corresponding to the four side wall surfaces on the second step; Step S20 is achieved through three stretches, including: S201: First stretch, stretching the blank into a cylinder with an oval plane at the top and a circular opening at the bottom end. During the stretching process, the short axis direction of the oval at the top is the same as the long axis direction of the oval of the blank, the long axis direction of the oval at the top is the same as the short axis direction of the oval of the blank, and both sides in the long axis direction of the oval plane at the top are tapered downward; S202: Second stretch, continuously stretching the cylinder to make its height increase and wall thickness decrease, stretching it into a cylinder with a rectangular plane at the top and an oval opening at the bottom end. During the stretching process, the length direction of the rectangle at the top is the same as the long axis direction of the oval at the top, the width direction of the rectangle at the top is the same as the short axis direction of the oval at the top, the circular opening at the bottom end transitions to an oval, the long axis direction of the oval opening at the bottom end is the same as the length direction of the rectangle at the top, the short axis direction of the oval opening at the bottom end is the same as the width direction of the rectangle at the top, and the tapered surfaces on both sides at the top become smaller; S203: Third stretch, continuously stretching the cylinder to make its height increase and wall thickness decrease, stretching it into a cuboid with a rectangular plane at the top and a rectangular opening at the bottom end. During the stretching process, the length and width of the rectangle at the top become smaller.
2. The deep drawing and integral forming production process of the asymmetric demolding angle thin-wall aluminum inner liner of the vehicle-mounted refrigerator according to claim 1, characterized in that: The oval opening at the bottom end in step S202 is the same as the oval at the top in step S201, and the rectangles at the top and bottom openings in step S203 are the same as the rectangle at the top in step S202.
3. The deep drawing integrated forming production process of the asymmetric demolding angle thin-walled aluminum inner liner of the vehicle-mounted refrigerator according to claim 1, characterized in that: In step S30, the angle of outward expansion after bulging the short side wall surfaces is not more than 5°.
4. The deep drawing and integral forming production process of the asymmetric demoulding angle thin-walled aluminum inner liner of the vehicle-mounted refrigerator according to claim 1, characterized in that: In step S30, the convex die of the hard die punch expands and forms from the inner cavity of the workpiece outward, and the concave die controls the shape of the workpiece.
5. The deep drawing and integral forming production process of the asymmetric demolding angle thin-wall aluminum inner liner of the in-vehicle refrigerator according to claim 1, characterized in that: The material of the blank is Al 1100.
Citation Information
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