Flat pipe stamping forming device
By using a flat tube stamping forming device to form flat and round ends in one step, the problems of low efficiency and poor shape consistency in traditional processes are solved, and efficient and simplified flat tube processing is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-03-06
AI Technical Summary
Traditional processes are inefficient and costly when processing flat tubes. Furthermore, multiple clamping operations result in poor consistency of end shapes, and the molds occupy a large space and are complex to maintain.
The flat tube stamping forming device includes a stamping frame, an upper die, and a lower die. It forms flat and round ends in one press, and eliminates springback deformation by using lateral power and radial pressure. Combined with a segmented structure and elastic elements to adjust the pressure, the forming quality is ensured.
It enables efficient flat tube forming, improves production efficiency, ensures consistent end shape, simplifies mold structure, and reduces maintenance complexity.
Smart Images
Figure CN223970692U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of automotive parts processing technology, and in particular to a flat tube stamping forming device. Background Technology
[0002] Flat tubes used in automotive components (such as exhaust pipes and frame tubes) are typically made by machining round tubes.
[0003] Traditional processes require the separate use of flattening dies, square dies, and end-shaping dies, resulting in low efficiency and high costs due to multiple clamping operations. Furthermore, the step-by-step processing is prone to affecting the consistency of end shape (such as roundness or straightness) due to pipe springback or positioning deviations. Multiple sets of dies occupy a large amount of equipment space and are complex to maintain. Utility Model Content
[0004] One objective of this invention is to solve or alleviate the aforementioned technical problems.
[0005] The present invention employs a flat tube stamping forming device, which is used to stamp a round tube into a formed tube, the two ends of which are a flat end and a round end, respectively. The flat tube stamping forming device includes a stamping frame, an upper die, and a lower die. The stamping frame includes an upper die holder and a lower die holder. The upper die is set on the upper die holder, and the lower die is fixed on the lower die holder. The flat tube stamping forming device also includes a flat forming structure and a round forming structure set on the lower die holder. The round forming structure includes a round end inner liner with lateral power. The flat forming structure includes a lower pressing member, a transverse moving member, and a flat inner liner fixed on the transverse moving member. The lower pressing member is fixed on the upper die holder, and the transverse moving member is laterally slidably connected to the lower die holder. Both the lower pressing member and the transverse moving member are provided with a transition slope.
[0006] The effect achieved by this invention is that the flat end and the round end can be formed in one press, which can improve production efficiency.
[0007] In a further technical solution, when the upper and lower molds are abutting each other and can no longer move downwards, the inner liner at the round end continues to move laterally to apply radial pressure to the round end.
[0008] It can eliminate springback deformation at the round end.
[0009] A further technical solution involves providing an inwardly protruding end positioning component in the lower mold.
[0010] It facilitates the accurate placement of round tubes in the radial direction.
[0011] A further technical solution involves providing a threaded sleeve on the lower mold; the end positioning component is screwed into the threaded sleeve.
[0012] This allows for fine-tuning of the radial position of the end locator.
[0013] Further technical solutions also include side top parts with power along the direction perpendicular to the forming tube, and both the upper and lower molds are provided with side top holes facing the side top parts.
[0014] This ensures accurate positioning of the round tube.
[0015] A further technical solution involves a square segment between the flat end and the round end; the square segment and the flat end have different thicknesses; the upper mold has a segmented structure, which includes a round shaping segment and a square pressing segment. The round shaping segment corresponds to the round end, and the square pressing segment corresponds to the square segment and the flat end; when the upper mold frame is at its highest position, the square pressing segment is lower than the round shaping segment, so that when the upper mold frame moves downward, the square pressing segment of the upper mold contacts the round tube first.
[0016] It can prevent the flat end from cracking.
[0017] A further technical solution involves a fixed elastic element seat on the upper mold frame, with the upper mold and the elastic element seat being elastically connected and the maximum distance between them being limited.
[0018] During the pressing process of the upper mold, the upper mold can automatically adjust the pressure on the forming tube due to the elastic force, which can ensure that the shape of the forming tube conforms to the design.
[0019] A further technical solution is that the flat forming structure also includes a transverse elastic element, the two ends of which are fixedly connected to the lower mold frame and the transverse moving element, respectively, so that the flat inner liner has a tendency to move away from the lower mold.
[0020] It can simplify the structure and also ensure the forming quality of the flat end.
[0021] A further technical solution is that the flat forming structure also includes a stabilizing component fixed on the lower mold frame, the side of which can fit against the side of the lower pressing component.
[0022] It can ensure that the pressing parts will not be skewed and improve the lateral movement accuracy of the flat inner liner. Attached Figure Description
[0023] Figure 1 This is a perspective view of a flat tube stamping forming device according to an embodiment of the present invention. Figure 1 .
[0024] Figure 2 This is a perspective view of a flat tube stamping forming device according to an embodiment of the present invention. Figure 2 .
[0025] Figure 3 This is a three-dimensional exploded view of the flat tube stamping forming device according to an embodiment of the present invention. Figure 1 .
[0026] Figure 4 This is a three-dimensional exploded view of the flat tube stamping forming device according to an embodiment of the present invention. Figure 2 .
[0027] Figure 5 This is a half-sectional view of the flat tube stamping forming device according to an embodiment of the present invention. Figure 1 .
[0028] Figure 6 This is a half-sectional view of the flat tube stamping forming device according to an embodiment of the present invention. Figure 2 .
[0029] Figure 7 This is a schematic diagram of section SEC1.
[0030] Figure 8 This is a schematic diagram of section SEC2; upper mold 1 is not shown.
[0031] Stamping frame 9 only Figure 1 , 6 Draw, but Figure 2-5 None of them are drawn in 7 and 8.
[0032] The accompanying drawings in the specification that best illustrate the technical features of this utility model are: Figure 3 .
[0033] Section 1 (SEC1); Section 2 (SEC2); Upper mold 1; Lower mold 2; Flat forming structure 3; Flat inner liner 31; Flat inner liner groove 311; Guide frame 312; Lateral movement component 32; Lower pressing component 33; Conversion slope 34; Lateral elastic component 35; Connecting end 351; Stabilizing component 352; Detachable body 353; Round forming structure 4; Round end inner liner 41; Round inner liner groove 411; Concave forming body 419; End positioning component 42; Threaded sleeve 421; Side top component 5; Side top hole 51; Segmented structure 6; Press square section 63; Round shaping section 64; Forming tube 8; Square section 82; Flat end 83; Round end 84; Concave part 849; Stamping frame 9; Upper mold frame 91; Limiting component 911; Elastic component seat 912; Lower mold frame 92; Guide structure 93. Detailed Implementation
[0034] The specific embodiments of this utility model will now be described with reference to the accompanying drawings.
[0035] As a specific embodiment, the flat tube stamping forming device of this utility model is used to stamp a round tube (not shown in the figure) into a formed tube 8, the two ends of the formed tube 8 being a flat end 83 and a round end 84, respectively. The cross-section of the flat end 83 is approximately rectangular, and the cross-section of the round end 84 is approximately circular.
[0036] The flat tube stamping forming apparatus includes a stamping frame 9, an upper die 1, and a lower die 2. The stamping frame 9 includes an upper die holder 91 and a lower die holder 92. The upper die 1 is mounted on the upper die holder 91, for example, fixed to the upper die holder 91 or mounted on the upper die holder 91 in a manner described later. The lower die 2 is fixed to the lower die holder 92. The stamping frame 9 is a prior art stamping frame, and its upper die holder 91 and lower die holder 92 are connected by a conventional guide structure 93 for linear guidance, allowing the upper die holder 91 to move closer to or further away from the lower die holder 92. After the stamping frame 9 is mounted on a power device (not shown in the attached figure) such as the output end of a punch press or cylinder, the upper die holder 91 or the lower die holder 92 is driven by the power device to move closer to or further away from the other one. It is easy to understand that the upper die 1 and the lower die 2 will also move with the upper die holder 91 and the lower die holder 92, respectively.
[0037] The flat tube stamping forming apparatus also includes a flat forming structure 3 and a round forming structure 4 disposed on the lower die holder 92; the round forming structure 4 includes a round end liner 41 with lateral power. For example, the round end liner 41 is driven by a hydraulic cylinder or air cylinder (not shown in the figure) to have lateral power. Typically, some round ends 84 are required to have a concave portion 849, and the round end liner 41 is correspondingly provided with a concave forming body 419.
[0038] The flat forming structure 3 includes a pressing member 33, a transverse member 32, and a flat inner liner 31 fixed on the transverse member 32.
[0039] The pressing component 33 is fixed on the upper mold base 91, and the transverse sliding component 32 is laterally slidably connected to the lower mold base 92, for example, through a linear guide rail; both the pressing component 33 and the transverse sliding component 32 are provided with a transition slope 34. Typically, the lower mold base 92 is fixedly provided with a guide frame 312; the flat inner liner 31 fits snugly through the guide frame 312 to ensure the accuracy of the transverse sliding component 32 during transverse movement.
[0040] It is easy to understand that both the upper mold 1 and the lower mold 2 are provided with a flat inner lining groove 311 corresponding to the flat inner lining body 31 and a round inner lining groove 411 corresponding to the round end inner lining body 41.
[0041] The working principle is as follows: A round tube (not shown in the attached diagram, i.e., the raw material before forming the tube 8) is placed in the lower mold 2. The upper mold frame 91 and the upper mold 1 move downwards, so that the upper mold 1 and the lower mold 2 clamp the round tube. From the moment the upper mold 1 contacts the round tube until the upper mold 1 abuts against the lower mold 2 and can no longer move downwards, the pressing member 33 abuts against the transverse moving member 32, causing the flat inner liner 31 to move laterally and insert into the flat end 83. The round end inner liner 41 moves laterally and inserts into the round end 84, until the upper mold 1 abuts against the lower mold 2 and can no longer move downwards, so that both the flat end 83 and the round end 84 are completely formed. Then, the round end inner liner 41 continues to move laterally to apply radial pressure to the round end 84, which can eliminate the springback deformation of the round end 84. After that, the upper mold frame 91, the upper mold 1, the flat inner liner 31, and the round end inner liner 41 are all reset, and the formed tube 8 can be removed from the lower mold 2.
[0042] As can be seen from the above, the flat tube stamping forming device of this utility model can complete the forming of the flat end 83 and the round end 84 in one press, which can improve production efficiency.
[0043] As one specific implementation, the lower mold 2 is provided with an inwardly protruding end positioning member 42. For example, the lower mold 2 is provided with a threaded sleeve 421; the end positioning member 42 is screwed into the threaded sleeve 421 to facilitate fine adjustment of the radial (i.e., along the axis of the circular tube) position of the end positioning member 42. It should be noted that the round end liner 41 is provided with a groove (not shown in the attached figure) to avoid the end positioning member 42 and the threaded sleeve 421. This facilitates accurate radial placement of the circular tube.
[0044] As one specific implementation, the flat tube stamping forming apparatus of this utility model further includes a side top member 5 with power along a direction perpendicular to the forming tube 8 (i.e., perpendicular to the forming tube 8 when viewed from above). Both the upper die 1 and the lower die 2 are provided with side top holes 51 facing the side top member 5. The side top member 5 clamps the round tube, which can ensure accurate positioning of the round tube.
[0045] As one specific implementation method, a square segment 82 is formed between the flat end 83 and the circular end 84. There is a difference in thickness between the square segment 82 and the flat end 83. This is easily understood, as both the square segment 82 and the flat end 83 have roughly rectangular cross-sections, but their thicknesses differ. The upper mold 1 is a segmented structure 6, which includes a circular shaping segment 64 and a pressing square segment 63. The circular shaping segment 64 corresponds to the circular end 84, and the pressing square segment 63 corresponds to the square segment 82 and the flat end 83. When the upper mold frame 91 is at its highest position, the pressing square segment 63 is lower than the circular shaping segment 64, so that when the upper mold frame 91 moves downwards, the pressing square segment 63 of the upper mold 1 contacts the circular tube first. During the downward movement of the upper mold frame 91 and the upper mold 1, the pressing square segment 63 contacts the forming tube 8 first, causing the square segment 82 of the circular tube to first be formed into a rectangular cross-section. Then, the end portion of the square segment 82 is flattened to form the flat end 83, which prevents the flat end 83 from cracking. Typically, the inner cavity of the pressing section 63 and the inner cavity of the lower mold 2 corresponding to the pressing section 63 are both designed with arc surfaces to achieve a smooth transition from the ring shape to the direction.
[0046] As one specific implementation, an elastic element seat 912 is fixedly provided on the upper mold frame 91. The upper mold 1 and the elastic element seat 912 are elastically connected, and the maximum distance between them is limited. For example, a circular hole is provided in the elastic element seat 912, and an elastic element such as a nitrogen spring cylinder (not shown in the attached figure) is provided in the circular hole. The two ends of the elastic element such as the spring cylinder abut against the elastic element seat 912 and the upper mold 1 respectively, so that the upper mold 1 has a tendency to move downward relative to the upper mold frame 91. The bottom end of the limiting member 911 is threadedly connected to the upper mold 1 and fixed. The top end of the limiting member 911 can abut against the upper mold frame 91 or the elastic element seat 912 to limit the maximum distance between the upper mold 1 and the elastic element seat 912. In other words, the upper mold 1 and the elastic element seat 912 will not separate. During the pressing process of the upper mold 1, the upper mold 1 can automatically adjust the pressure on the forming tube 8 due to the elastic force, which can ensure that the shape of the forming tube 8 conforms to the design.
[0047] As one specific implementation, the flat forming structure 3 also includes a transverse elastic element 35, which is a nitrogen spring cylinder, etc. Both ends of the transverse elastic element 35 (for example, one end is fixed inside the lower mold frame 92, and the connecting end 351 of the other end passes through the lower mold frame 92 and is fixedly connected to the transverse moving element 32) are fixedly connected to the lower mold frame 92 and the transverse moving element 32 respectively, causing the flat inner liner 31 to tend to move away from the lower mold 2. After the upper mold frame 91 and the upper mold 1 move upward and reset, the flat inner liner 31 and the transverse moving element 32 automatically reset, so that the flat inner liner 31 is synchronously pulled out from the flat end 83 along with the upward movement of the upper mold frame 91 and the upper mold 1, which simplifies the structure. The process of the flat inner liner 31 being pulled out from the flat end 83 under the premise that the flat end 83 is surrounded by the upper mold 1 (for embodiments where the upper mold 1 and the elastic element seat 912 are elastically connected, this process is relatively long) ensures the forming quality of the flat end 83.
[0048] As one specific implementation, the flat forming structure 3 also includes a stabilizing member 352 fixed on the lower mold frame 92, the side of which can fit against the side of the pressing member 33. When the pressing member 33 is subjected to the spring force of the lateral elastic member 35 restoring the lateral moving member 32, the stabilizing member 352 can absorb the restoring spring force of the lateral elastic member 35, thereby ensuring that the pressing member 33 will not tilt and improving the lateral movement accuracy of the flat inner liner 31. Typically, the stabilizing member 352 includes a detachable body 353, the side of which is the side of the detachable body 353, facilitating the replacement of the detachable body 353.
[0049] The terms used in this invention, such as "first," "second," etc., do not indicate any order, quantity, or importance, but are merely for distinction.
[0050] In this invention, terms such as "a" or "an" are used to indicate not a limitation on the quantity, but rather to indicate the existence of at least one of the mentioned objects.
[0051] In this utility model, terms indicating direction or location such as top, bottom, side, longitudinal, transverse, middle, center, outside, inside, horizontal, vertical, left, right, above, and below are used to indicate relative positions rather than absolute positions.
[0052] Terms used in this invention, such as "approximately," "generally," "approximately," and "similar," are limiting terms used to indicate features that are present but allow for certain deviations. The amount of deviation allowed may vary depending on the specific context; for example, regarding dimensional deviations, the specific context may include, but is not limited to, relevant standards for dimensional tolerances.
Claims
1. A flat tube stamping forming device for stamping a round tube into a shaped tube (8), the shaped tube (8) having a flat end (83) and a round end (84) at two ends respectively, the flat tube stamping forming device comprising a stamping frame (9), an upper die (1) and a lower die (2), the stamping frame (9) comprising an upper die frame (91) and a lower die frame (92), the upper die (1) being arranged on the upper die frame (91), and the lower die (2) being fixed on the lower die frame (92) ; characterized in that the flat tube stamping forming device further comprising a flat forming structure (3) and a round forming structure (4) arranged on the lower die frame (92), the round forming structure (4) comprising a round end inner lining body (41) with transverse power, and the flat forming structure (3) comprising a pressing piece (33), a transverse moving piece (32) and a flat inner lining body (31) fixed on the transverse moving piece (32), the pressing piece (33) being fixed on the upper die frame (91), and the transverse moving piece (32) being transversely slidably connected with the lower die frame (92), and the pressing piece (33) and the transverse moving piece (32) being provided with a conversion inclined surface (34).
2. The apparatus according to claim 1, wherein When the upper die (1) and the lower die (2) cannot continue to move downward, the round end inner lining body (41) continues to move transversely to exert radial pressure on the round end (84).
3. The apparatus according to claim 1, wherein The lower die (2) is provided with an end positioning piece (42) protruding inward.
4. The apparatus according to claim 3, wherein The lower die (2) is provided with a threaded sleeve (421), and the end positioning piece (42) is screwed into the threaded sleeve (421).
5. The apparatus according to claim 1, wherein Further comprising a side top piece (5) with power in a direction perpendicular to the shaped tube (8), and the upper die (1) and the lower die (2) are provided with a side top hole (51) facing the side top piece (5).
6. The flat tube punch forming apparatus according to claim 1, wherein The flat end (83) and the round end (84) are connected by a square section (82), and the thickness of the square section (82) is different from that of the flat end (83), the upper die (1) is a segmented structure (6) comprising a round shaping section (64) and a square pressing section (63), the round shaping section (64) corresponding to the round end (84), and the square pressing section (63) corresponding to the square section (82) and the flat end (83), and when the upper die frame (91) is at the highest position, the square pressing section (63) is lower than the round shaping section (64), so that when the upper die frame (91) moves downward, the square pressing section (63) of the upper die (1) is first in contact with the round tube.
7. The apparatus according to claim 6, wherein The upper die frame (91) is fixedly provided with an elastic piece seat (912), and the upper die (1) is elastically connected with the elastic piece seat (912), and the maximum distance between them is limited.
8. The apparatus according to claim 7, wherein The flat forming structure (3) further comprises a transverse elastic piece (35), and the two ends of the transverse elastic piece (35) are fixedly connected with the lower die frame (92) and the transverse moving piece (32) respectively, so that the flat inner lining body (31) has a tendency to move away from the lower die (2).
9. The apparatus according to claim 8, wherein The flat forming structure (3) further comprises a stabilizing piece (352) fixed on the lower die frame (92), and the side surface of the stabilizing piece (352) can be attached to the side surface of the pressing piece (33).