A processing method for a special-shaped cup body

Abstract

The present invention discloses a processing method for a special-shaped cup body. The special-shaped cup body includes a cup body and a cup bottom made of a metal material. A concave portion is provided on the side wall of the cup body, and the cup bottom is fixedly connected to the bottom of the cup body. The processing steps include: S1 pipe pressing, S2 hydroforming, S3 bottom cutting, S4 necking, S5 head cutting, S6 thread rolling, and S7 bottom welding. For S1 pipe pressing, a pipe press is used to process and form the concave portion on the side wall of the cup body by rolling. The processing method for the special-shaped cup body of the present invention is simple to implement, and can greatly deepen the concave depth of the concave portion of the cup body, and can increase the depth by 100% compared with the prior art process.

Description

Technical Field

[0001] The present invention belongs to the technical field of water cup processing, and particularly relates to a processing method for a special-shaped cup body. Background Art

[0002] As is well known, plastic cups have the best plasticity and rich shapes. Various special-shaped plastic cups can well meet the personalized needs of consumers. However, for water cups made of metal materials (such as stainless steel or titanium), due to the limitations of processing technology and material properties, metal cups mainly have a rotational symmetric structure. For the metal special-shaped cups manufactured by the existing processes, there are many limitations; for example Figure 1 As shown, it is a special-shaped cup with a concave portion 11 on the cup body. The existing process generally uses hydroforming dies such as those with application numbers 201920866331.1 or 202120649767.2 to directly process and form by hydroforming process. This solution can be directly thought of by those skilled in the art, but it has the following defects: Limited by the elongation rate of the metal material, the concave depth of the concave portion 11 is insufficient, and the aesthetic appearance of the special-shaped cup is greatly reduced; the elongation rate of stainless steel materials generally does not exceed 50%. For example Figure 2 As shown, taking a metal round tube with a conventional diameter of 50 mm as an example, when processed by the above solution, the maximum diameter of the cup body 10 after hydroforming is about 75 mm. That is to say, the convex portion 13 above the concave portion 11 has an outward convex dimension of about 12.5 mm compared with the round tube 1. That is, the maximum concave depth d1 of the concave portion 11 relative to the convex portion 13 can only reach 12.5 mm, which is far from enough. Therefore, the processing method needs to be improved. Summary of the Invention

[0003] The purpose of the present invention is to provide a processing method for a special-shaped cup body, which is simple to process and can greatly deepen the concave depth of the cup body. Compared with the existing technology process, the depth can be increased by 100%.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions.

[0005] A processing method for a special-shaped cup body, the special-shaped cup body includes a cup body and a cup bottom made of metal material, a concave portion is provided on the side wall of the cup body, and the cup bottom is fixedly connected to the bottom of the cup body; it includes the following processing steps:

[0006] S1. Tube pressing

[0007] Cut a straight cylindrical round tube with a preset length, and press a concave portion on its side wall to form a cup body blank; the upper and lower parts of the concave portion are the ends of the round tube, and at this time, the concave depth of the concave portion relative to the ends is d2;

[0008] S2. Hydroforming

[0009] The cup body blank is placed into the water expansion mold of the water expansion equipment, and the middle part of the cup body blank is expanded outward except for the concave part by water pressure molding. The ends of the upper and lower ends of the cup body blank close to the concave part expand outward to form a convex part, and the upper and lower ends of the cup body blank form a head and a bottom respectively; the convex part and the head and the bottom are respectively an upper transition section and a lower transition section; at this time, the outer convex dimension of the convex part relative to the end part is d1, and the inner concave depth d3 of the concave part relative to the convex part is d1+d2;

[0010] S3. Bottom cutting

[0011] Use cutting equipment to horizontally cut off the lower transition section and bottom of the cup body blank;

[0012] S4. Shrinkage

[0013] Use the shrinking equipment to shrink the head of the cup body blank so that the diameter of the head reaches the preset size to match the cup cover, and at the same time make the weld of the head smooth;

[0014] S5. Cutting head

[0015] Use cutting equipment to horizontally cut off the excess part of the head of the cup body blank, leaving a preset length at the head to form the cup mouth;

[0016] S6. Thread rolling

[0017] Use thread rolling equipment to roll threads on the cup mouth to form threads for screw connection with the cup cover to form a complete cup body;

[0018] S7. Solder bottom

[0019] Take the cup bottom and use welding equipment to weld it to the bottom of the cup body to form a special-shaped cup body.

[0020] Preferably, in step S1, the tube is pressed by rolling to press a concave portion on the side wall of the round tube.

[0021] Preferably, step S1 is used for tube pressing, and a rolling machine is used, including a bracket, a rolling die is horizontally fixed on the bracket and a connecting part, a limiting part, a sleeve part and a forming part are arranged in sequence from left to right; the connecting part is used to be fixedly connected to the bracket, and the left side of the limiting part is abutted against the bracket for limiting; the outer diameter of the limiting part is larger than the outer diameter of the sleeve part; the upper surface of the forming part is flat and the height is lower than the sleeve part, and the height difference between the two is d2; the upper die is arranged above the rolling die, and includes a pressing wheel rotatably connected to the lower end of the connecting member, and the connecting member is fixedly connected to the power mechanism and can move up, down, left and right.

[0022] According to the above-mentioned rolling machine, the steps of pressing the tube in step S1 are as follows:

[0023] S1-1: insert the round tube into the rolling die, and the left end of the round tube is sleeved on the sleeve joint and contacts the limit part to limit the position;

[0024] S1-2: Start the device and lower the pressure wheel of the upper die until it touches the round tube.

[0025] S1-3: After the upper die continues to feed downward by a preset amount, the power mechanism drives the upper die to move left and right, causing the pressure wheel to roll back and forth on the middle part of the round tube.

[0026] S1-4: Repeat step S1-3 until a concave part is formed on the side wall of the middle part of the round tube to form a cup body blank. At this time, the inner concave depth of the concave part is d2.

[0027] S1-5: The upper die moves upward driven by the power mechanism, and the cup body blank is taken out.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows: By adopting the above technical solution, first, the middle part of the round tube is rolled inward to form a concave part. At this time, the inner concave depth of the concave part is d2. Then, a hydroforming process is used to expand the end part to form a convex part, and the outer convex dimension of the convex part is d1. At this time, the inner concave depth d3 of the concave part relative to the convex part is d1 + d2. Both d1 and d2 can be set according to the elongation rate of the selected metal material. For example, for a stainless steel round tube with an elongation rate of 50% and a diameter of 50 mm, d1 and d2 can be set up to 12.5 mm at most, and then d3 can reach 25 mm. Compared with the prior art process, the inner concave depth of the concave part of the special-shaped cup body manufactured by the processing method of the present invention has increased by 100%, and the processing method can be relatively easily realized based on the existing technology.

[0029] A further beneficial effect is that the pressure tube adopts the above-mentioned rolling machine, and a concave part is rolled on the side wall of the round tube by rolling. This method can avoid risks such as cracking, wrinkling, and deformation of the round tube during the forming process of the concave part. Description of the Drawings

[0030] Figure 1 It is a three-dimensional structure schematic diagram of a special-shaped cup body.

[0031] Figure 2 It is a schematic diagram of a special-shaped cup body manufactured by the prior art process.

[0032] Figure 3 It is a schematic diagram of the steps of the processing method of the present invention.

[0033] Figure 4 is Figure 3 a schematic diagram of the cup body blank after hydroforming in

[0034] Figure 5 is Figure 3 a schematic diagram of the open die state when the pressure tube in step S1 uses a rolling machine in

[0035] Figure 6 isFigure 3 Schematic diagram of the pipe pressing state when step S1 in the [description] presses the pipe using a rolling press. Detailed implementation mode

[0036] To make the technical solution of the present invention clearer, the following is a detailed description of the present invention in conjunction with the attached [drawings]. It should be understood that the specific implementation modes described in this specification are only for explaining the present invention and are not intended to limit the protection scope of the present invention. Figures 1 to 6 Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific implementation modes and are not intended to limit the present invention.

[0037] The present invention is a processing method for a special-shaped cup body. As shown in [figure], the special-shaped cup body includes a cup body 10 and a cup bottom 20 made of a metal material. A concave portion 11 is provided on the side wall of the cup body 10, and the cup bottom 20 is welded to the bottom of the cup body 10; as shown in [figure], the processing steps are as follows:

[0038] The present invention is a processing method for a special-shaped cup body. As Figure 1 shown, the special-shaped cup body includes a cup body 10 made of a metal material and a cup bottom 20. A concave portion 11 is provided on the side wall of the cup body 10, and the cup bottom 20 is welded to the bottom of the cup body 10; as Figure 3 shown, the processing steps are as follows:

[0039] S1. Pipe pressing: Cut a straight cylindrical round pipe 1 of a preset length, and press a concave portion 11 on its side wall to form a cup body blank. The upper and lower parts of the concave portion 11 are the ends 12 of the round pipe 1. At this time, the inner concave depth of the concave portion 11 relative to the end 12 is d2;

[0040] S2. Hydroforming: Place the cup body blank into the hydroforming die of the hydroforming equipment, and use hydraulic pressure to form it, so that the middle part of the cup body blank except for the concave portion 11 expands outward. The parts of the ends 12 at the upper and lower ends of the cup body blank close to the concave portion 11 expand outward to form convex portions 13. The upper and lower ends of the cup body blank respectively form a head 14 and a bottom 15; between the middle part and the head 14 and the bottom 15 are an upper transition section and a lower transition section respectively; as Figure 4 shown, at this time, the outer convex dimension of the convex portion 13 relative to the end 12 is d1, and the inner concave depth d3 of the concave portion 11 relative to the convex portion 13 can reach d1 + d2; both d1 and d2 can be set according to the elongation rate of the selected metal material. For example, for a stainless steel round pipe with an elongation rate of 50% and a diameter of 50 mm, d1 and d2 can be set to a maximum of 12.5 mm, then d3 can reach 25 mm. Compared with the prior art process, the inner concave depth of the concave portion 11 has increased by 100%;

[0041] S3. Bottom cutting: Use a cutting device to horizontally cut off the lower transition section and the bottom 15 of the cup body blank;

[0042] S4. Necking: Use a necking device to perform necking on the head 14 of the cup body blank, so that the diameter of the head 14 reaches a preset size to match the cup lid. Since the round tube is formed by rolling and welding a metal sheet and has a weld seam on the side wall, necking can make the weld seam of the head 14 smooth and avoid difficult handling of the weld seam after rolling the thread;

[0043] S5. Cutting the head: Use a cutting device to horizontally cut off the excess part of the head 14 of the cup body blank, so that the head 14 leaves a preset length to form the cup mouth 16;

[0044] S6. Rolling the thread: Use a thread rolling device to roll a thread 17 for screwing with the cup lid on the cup mouth 16 to form a complete cup body 10;

[0045] S7. Welding the bottom: Take the cup bottom 20 and use a welding device to weld and fix it to the bottom of the cup body 10 to form a special-shaped cup body.

[0046] For the forming method of the concave part 11, if the stretching and stamping method is adopted, one-time stretching and stamping is likely to cause the round tube to rupture. Even if the stretching and stamping is fed downward more than twice to reduce the risk of round tube rupture, when the inner concave depth of the concave part 11 reaches 3 mm, poor phenomena such as wrinkling and deformation of the cup body blank will occur; to avoid the above problems, in this embodiment, the concave part 11 is formed by rolling, as Figure 5 shown in FIG. 6, the rolling is performed by a rolling machine, which includes a bracket 31, and a rolling die 32 is horizontally or vertically fixedly arranged on the bracket 31. In this embodiment, it is horizontally arranged. The rolling die 32 is respectively provided with a connecting part 321, a limiting part 322, a socket part 323 and a forming part 324 from left to right; the connecting part 321 is used for fixedly connecting with the bracket 31, and the left side of the limiting part 322 abuts against and limits the bracket 31; the outer diameter of the limiting part 322 is larger than the outer diameter of the socket part 323; the upper surface of the forming part 324 is a plane and is lower than the socket part 323, and the height difference is the inner concave depth d2 of the concave part 11; an upper die 33, which includes a pressure wheel 331 rotatably connected to the lower end of a connecting member 332, and the connecting member 332 is fixedly connected to a power mechanism and can move up, down, left and right.

[0047] According to the above rolling machine, when pressing the tube, it includes the steps as Figures 5 - 6 shown:

[0048] S1: First, put the round tube 1 on the rolling die 32, the left end of the round tube 1 abuts against and limits the limiting part 322, and the left end of the round tube 1 is sleeved on the socket part 323;

[0049] S2: Start the device, and lower the pressure wheel 331 of the upper die 33 until it abuts against the round tube 1;

[0050] S3: After the upper die 33 continues to feed downward by a preset amount, the power mechanism drives the upper die 33 to move left and right so that the pressing wheel 331 rolls back and forth left and right in the middle of the round tube 1;

[0051] S4: Repeat S3 until the recess 11 on the middle side wall of the round tube 1 is formed to form a cup body blank, and the inner concave depth of the recess 11 is d2;

[0052] S5: The upper die 33 moves upward driven by the power mechanism, and the cup body blank is taken out.

Claims

1. A processing method for a special-shaped cup body, the special-shaped cup body comprising a cup body (10) and a cup bottom (20) made of a metal material, a concave portion (11) being provided on the side wall of the cup body (10), and the cup bottom (20) being fixedly connected to the bottom of the cup body (10); characterized in that: The processing steps include: S1.Press tube A straight cylindrical round tube (1) of a preset length is cut, and a concave portion (11) is pressed out on the side wall of the straight cylindrical tube (1) to form a cup body blank; the upper and lower parts of the concave portion (11) are the end portions (12) of the round tube (1), and the inner concave depth of the concave portion (11) relative to the end portions (12) is d2; S2. Water swelling The cup body blank is placed in a water expansion mold of a water expansion device, and is formed by water pressure, so that the middle part of the cup body blank, except for the concave part (11), expands outward, and the end parts (12) at the upper and lower ends of the cup body blank close to the concave part (11) expand outward to form a convex part (13), and the upper and lower ends of the cup body blank form a head (14) and a bottom (15) respectively; the convex part (13) and the head (14) and the bottom (15) are respectively an upper transition section and a lower transition section; at this time, the outer convex dimension of the convex part (13) relative to the end part (12) is d1, and the inner concave depth d3 of the concave part (11) relative to the convex part (13) is d1+d2; S3. Bottom cutting Using a cutting device to horizontally cut off the lower transition section and the bottom (15) of the cup body blank; S4. Shrinkage Using a necking device to neck the head (14) of the cup body blank, so that the diameter of the head (14) reaches a preset size to match the cup cover, and at the same time, the weld of the head (14) is smooth; S5. Cutting head Using a cutting device to horizontally cut off the excess portion of the head (14) of the cup body blank, so that a preset length of the head (14) is left to form a cup mouth (16); S6. Thread rolling Using a thread rolling device to roll threads on the cup mouth (16) to form threads (17) for screw connection with the cup cover, thereby forming a complete cup body (10); S7. Solder bottom The cup bottom (20) is taken and welded to the bottom of the cup body (10) using welding equipment to form a special-shaped cup body.

2. The processing method of the special-shaped cup body according to claim 1, characterized in that: Step S1: rolling the tube to form a concave portion (11) on the side wall of the round tube (1).

3. The processing method of the special-shaped cup body according to claim 2, wherein: Step S1: The rolling process of the pressed tube adopts a rolling machine, comprising a bracket (31), a rolling die (32) horizontally fixed on the bracket (31) and provided with a connecting portion (321), a limiting portion (322), a sleeve portion (323) and a forming portion (324) in sequence from left to right; the connecting portion (321) is used for fixed connection with the bracket (31), and the left side of the limiting portion (322) abuts against the bracket (31) for limiting; the outer diameter of the limiting portion (322) is greater than the outer diameter of the sleeve portion (323); the upper surface of the forming portion (324) is a plane and the height is lower than the sleeve portion (323), and the height difference between the two is d2; the upper die (33) is arranged above the rolling die (32), and comprises a pressing wheel (331) rotatably connected to the lower end of the connecting member (332), and the connecting member (332) is fixedly connected to the power mechanism and can move up, down, left and right.

4. The processing method of the special-shaped cup body according to claim 3, characterized in that: Step S1: The steps of pressing the tube are as follows: S1-1: inserting the round tube (1) into the rolling die (32), wherein the left end of the round tube (1) is sleeved on the sleeve connection portion (323) and abuts against the limit portion (322) for limit position; S1-2: starting the equipment to press the pressing wheel (331) of the upper mold (33) downward until it contacts the round tube (1); S1-3: After the upper die (33) continues to feed downward by a preset amount, the power mechanism drives the upper die (33) to move left and right so that the pressing wheel (331) rolls back and forth left and right in the middle of the circular tube (1); S1-4: Repeat step S1-3 until the recess (11) on the middle side wall of the circular tube (1) is formed into a cup body blank. At this time, the inner concave depth of the recess (11) is d2; S1-5: The upper die (33) moves upward driven by the power mechanism, and the cup body blank is taken out.

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