Deep drawing integrated forming production process for asymmetric demolding angle thin-wall aluminum inner container of vehicle-mounted refrigerator

Abstract

The invention discloses a deep drawing integrated forming production process for a thin-wall aluminum inner container with asymmetric demolding angles of a vehicle-mounted refrigerator. The thin-wall aluminum inner container is manufactured through material piece blanking, drawing, expanding, shaping, edge cutting, edge turning, opening shaping and side punching. According to the structure of a thin-wall aluminum inner container product with the asymmetric demolding angle of a vehicle-mounted refrigerator, an oval material sheet is adopted for stretching, so that material flowing during stretching forming is facilitated, the problems of material stacking, wrinkling and the like are avoided, the oval material sheet is pulled up to be a cuboid through multi-time stretching, in the expanding step, a male die floats under the limitation of a female die, and the demolding angle of the thin-wall aluminum inner container product is increased. The specified side wall surface of the workpiece is expanded to the specified angle, and the material sheet is integrally formed into the product in the whole production process, so that a split welding production process can be replaced, the consistency of the product can be ensured, the production cost is reduced, and the production period is shortened.

Description

Technical Field

[0001] The invention relates to a production process of an aluminum liner for a vehicle refrigerator, in particular to a production process of a thin-walled aluminum liner for a vehicle refrigerator with an asymmetric demoulding angle. Background Art

[0002] The production process of aluminum liner forming for car refrigerators is generally divided into stretching forming or bending and welding forming.

[0003] When using the stretch forming production process, there are certain requirements for the shape of the aluminum liner. For example, the demoulding angle is preferably 0 degrees and the demoulding angle of each surface is consistent, which limits the product modeling space.

[0004] When the bending and welding forming production process is adopted, the welding process and the grinding process are added compared with the stretching forming production process, and the manufacturing cost and cycle are lower than the stretching forming production process.

[0005] For thin-walled aluminum liner shapes with inconsistent demoulding angles and asymmetric shapes, the above two production processes cannot effectively achieve production or have too many steps. Summary of the invention

[0006] Purpose of the invention: In view of the above problems, the purpose of the present invention is to provide a production process for a thin-walled aluminum inner liner with an asymmetric demolding angle for a vehicle refrigerator, which can not only adapt to the inconsistent and asymmetric shape of the thin-walled aluminum inner liner with a demolding angle, but also relatively reduce the production process.

[0007] Technical solution: A deep-drawing integrated production process for a thin-walled aluminum liner with an asymmetric demoulding angle for a car refrigerator, comprising the following steps:

[0008] S10: blanking sheet, the sheet shape is oval;

[0009] S20: stretching, stretching the sheet into a rectangular parallelepiped with an open lower end;

[0010] S30: Expanding a group of short side walls of the cuboid to expand their angles outward, and the short side walls on both sides form an asymmetric angle, and a first step is formed at the lower end opening;

[0011] S40: shaping, shaping the angles of the four side walls of the cuboid and the first step, completing the shaping of the side wall angles, and sharpening the R angle of the first step;

[0012] S50: trimming the outer edge of the first step to make the first step have a uniform circumferential width;

[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, forming punching holes on the second step corresponding to the four side wall surfaces respectively.

[0016] Further, step S20 is implemented by three stretching steps, including:

[0017] S201: Stretching once to stretch the sheet into a cylinder with an elliptical plane at the top and a circular opening at the bottom. During the stretching process, the direction of the short axis of the top ellipse is the same as the direction of the long axis of the sheet ellipse, the direction of the long axis of the top ellipse is the same as the direction of the short axis of the sheet ellipse, and both sides of the long axis direction of the top elliptical plane have tapered surfaces toward the lower end;

[0018] S202: secondary stretching, further 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 elliptical opening at the bottom. During the stretching process, the length direction of the top rectangle is the same as the major axis direction of the top ellipse, the width direction of the top rectangle is the same as the minor axis direction of the top ellipse, the circle of the bottom opening transitions to an ellipse, the major axis direction of the ellipse at the bottom opening is the same as the length direction of the top rectangle, the minor axis direction of the ellipse at the bottom opening is the same as the width direction of the top rectangle, and the conical surfaces on both sides of the top become smaller;

[0019] S203: Stretching three times, further stretching the column to increase its height and reduce its wall thickness, 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 decrease.

[0020] Furthermore, the lower opening ellipse in step S202 is the same as the top ellipse in step S201, and the top and lower opening rectangles in step S203 are the same as the top rectangle in step S202.

[0021] Furthermore, the thickness t of the sheet 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.

[0022] Furthermore, in step S30, the outward expansion angle of the short side wall after expansion is no more than 5°.

[0023] Furthermore, in step S30, a convex die of a hard die or a soft rubber punch is used to expand and mold from the inner cavity of the workpiece outward, and a concave die controls the morphology of the workpiece.

[0024] Furthermore, the material of the sheet is Al 1100.

[0025] Beneficial effect: The advantages of the present invention are: for the structure of the thin-walled aluminum liner product with an asymmetric demolding angle of the car refrigerator, an elliptical sheet is used for stretching to facilitate the flow of material during stretching and avoid problems such as piling and wrinkles. The elliptical sheet is stretched into a rectangular parallelepiped by multiple stretching. During the expansion 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 integrates the sheet into a product, which can replace the split welding production process, which can not only ensure the consistency of the product, but also reduce the production cost and shorten the production cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of product changes under the production process of this application;

[0027] Figure 2 This is a schematic diagram of product changes after three stretching steps in step S20. DETAILED DESCRIPTION

[0028] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments.

[0029] A deep drawing integrated production process for a vehicle refrigerator with an asymmetric demoulding angle thin-walled aluminum liner, specifically comprising steps S10 to S80, and the product undergoes changes in each step as shown in the attached figure. Figure 1 , 2 As shown, the red lines in the figure indicate the changing parts of the product in each step.

[0030] S10: blanking a sheet, punching and blanking are performed on the Al 1100 plate to obtain a sheet, and the sheet shape is elliptical.

[0031] S20: stretching, stretching the sheet into a rectangular parallelepiped with an open lower end, which is achieved by three stretching steps, specifically including steps S201 to S203.

[0032] S201: One stretching to stretch the sheet into a cylinder with an elliptical plane on the top and a circular opening at the bottom. During the stretching process, the direction of the short axis of the top ellipse is the same as the direction of the long axis of the sheet ellipse, the direction of the long axis of the top ellipse is the same as the direction of the short axis of the sheet ellipse, and both sides of the long axis direction of the top elliptical plane have tapered surfaces toward the lower end. The workpiece obtained by stretching in this step is an axisymmetric structure, which is symmetrical with the long axis direction of the top elliptical plane as the axis of symmetry and with the short axis direction as the axis of symmetry.

[0033] S202: Secondary stretching, continuing to stretch the cylinder to increase its height and reduce its wall thickness, stretching it 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 top elliptical opening in step S201. During the stretching process, the length direction of the top rectangle is the same as the major axis direction of the top ellipse, the width direction of the top rectangle is the same as the minor axis direction of the top ellipse, the circle of the bottom opening transitions to an elliptical shape, the major axis direction of the bottom opening is the same as the length direction of the top rectangle, the minor axis direction of the bottom opening is the same as the width direction of the top rectangle, and the conical surfaces on both sides of the top become smaller; the workpiece obtained by stretching in this step is an axisymmetric structure, which is symmetrical with the major axis direction of the top rectangular plane as the axis of symmetry and with the minor axis direction as the axis of symmetry.

[0034] S203: Three stretchings, the cylinder is stretched further 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 top and bottom opening rectangles in this step are the same as the top rectangle in step S202. During the stretching process, the length and width of the top rectangle decrease. The workpiece obtained by the stretching in this step is an axisymmetric structure, symmetrical with the long axis direction of the top rectangular plane as the symmetry axis, and symmetrical with the short axis direction as the symmetry axis.

[0035] S30: Expanding, expand a group of short side walls of the cuboid to expand their angles outward, and the expansion angles of the short side walls on both sides are not allowed, forming an asymmetric angle of the product design. The expansion angle after expansion is no more than 5°, and the first step is formed at the lower opening. In this step, the shape of the workpiece is controlled by the die, and a hard die or a soft rubber punch is used as a punch. The workpiece is expanded outward from the inner cavity, and the punch can float and change; the punch and die are made according to the product design. Figure 1 The arrows in step S30 indicate the outward expansion directions of the short sidewall surfaces on both sides.

[0036] S40: shaping, shaping the angles of the four side walls of the cuboid and the first step, completing the shaping of the side wall angles, and sharpening the R angle of the first step. This step can be completed by shaping once or twice.

[0037] S50: trimming the outer edge of the first step to make the first step have a uniform circumferential width.

[0038] S60: Flanging: flanging downward at a set position on the first step to form a second step.

[0039] S70: Mouth shaping: shaping the mouth of the second step.

[0040] S80: side punching, forming punching holes on the second step corresponding to the four side wall surfaces, so as to obtain a thin-walled aluminum liner product with an asymmetric demoulding angle for a car refrigerator.

[0041] The size of the elliptical sheet is calculated according to the actual shape of the product, and the stretching steps are designed according to the actual size of the product and the material stretching ratio. For example, if the sheet thickness t 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] The present application aims at the structure of a thin-walled aluminum liner product with an asymmetric demolding angle for a car refrigerator. An elliptical sheet is used for stretching to facilitate material flow during stretching and avoid problems such as piling and wrinkles. The elliptical sheet is stretched into a rectangular parallelepiped by multiple stretching. During the expansion step, the punch floats under the restriction of the die, and the specified side wall surface of the workpiece is expanded outward to a specified angle. The entire production process forms the sheet into an integral product, which can replace the split welding production process, which can not only ensure product consistency, but also reduce production costs and shorten the production cycle.

Claims

1. A deep drawing integrated production process for thin-walled aluminum liner with asymmetric demoulding angle for vehicle refrigerators, characterized in that The following steps are involved: S10: blanking sheet, the sheet shape is oval; S20: stretching, stretching the sheet into a rectangular parallelepiped with an open lower end; S30: Expanding a group of short side walls of the cuboid to expand their angles outward, and the short side walls on both sides form an asymmetric angle, and a first step is formed at the lower end opening; S40: shaping, shaping the angles of the four side walls of the cuboid and the first step, completing the shaping of the side wall angles, and sharpening the R angle of the first step; S50: trimming the outer edge of the first step to make the first step have a uniform circumferential 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 on the second step corresponding to the four side wall surfaces respectively.

2. According to claim 1, the deep drawing integrated production process of thin-walled aluminum liner with asymmetric demoulding angle for vehicle refrigerator is characterized by: Step S20 is implemented by three stretching steps, including: S201: Stretching once to stretch the sheet into a cylinder with an elliptical plane at the top and a circular opening at the bottom. During the stretching process, the direction of the short axis of the top ellipse is the same as the direction of the long axis of the sheet ellipse, the direction of the long axis of the top ellipse is the same as the direction of the short axis of the sheet ellipse, and both sides of the long axis direction of the top elliptical plane have tapered surfaces toward the lower end; S202: secondary stretching, further 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 elliptical opening at the bottom. During the stretching process, the length direction of the top rectangle is the same as the major axis direction of the top ellipse, the width direction of the top rectangle is the same as the minor axis direction of the top ellipse, the circle of the bottom opening transitions to an ellipse, the major axis direction of the ellipse at the bottom opening is the same as the length direction of the top rectangle, the minor axis direction of the ellipse at the bottom opening is the same as the width direction of the top rectangle, and the conical surfaces on both sides of the top become smaller; S203: Stretching three times, further stretching the column to increase its height and reduce its wall thickness, 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 decrease.

3. The deep drawing integrated production process of the thin-walled aluminum liner with asymmetric demoulding angle for a vehicle refrigerator according to claim 2 is characterized in that: The lower opening ellipse in step S202 is the same as the top ellipse in step S201 , and the top and lower opening rectangles in step S203 are the same as the top rectangle in step S202 .

4. The deep drawing integrated production process of the thin-walled aluminum liner with asymmetric demoulding angle for a vehicle refrigerator according to claim 2 or 3, characterized in that: The thickness t of the sheet 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.

5. The deep drawing integrated production process of the thin-walled aluminum liner with asymmetric demoulding angle for a vehicle refrigerator according to claim 1 is characterized in that: In step S30, the angle of the short side wall after expansion is no more than 5°.

6. The deep drawing integrated production process of the thin-walled aluminum liner with asymmetric demoulding angle for a vehicle refrigerator according to claim 1 is characterized in that: In step S30, a convex die of a hard die or a soft rubber punch is used to expand and mold from the inner cavity of the workpiece outward, and a concave die controls the morphology of the workpiece.

7. The deep drawing integrated production process of thin-walled aluminum liner with asymmetric demoulding angle for vehicle refrigerator according to claim 1 is characterized by: The material of the tablet is Al 1100.

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