A continuous die for roll forming a stamping

Abstract

The utility model relates to a kind of stamping part coiling continuous die, including upper die and lower die, small bending station, big bending station and coiling station are sequentially arranged from front to back between upper die and lower die, three positioning grooves capable of accommodating the stamping part are equipped on the lower die seat, each positioning groove is sequentially communicated from front to back, three positioning grooves are sequentially on small bending station, big bending station and coiling station;The upper die body includes small bending press block, big bending press block and coiling press block, small bending press block is on small bending station, and the lower surface of small bending press block cooperates with the groove bottom of corresponding positioning groove, big bending press block is on big bending station, and the lower surface of big bending press block cooperates with the groove bottom of corresponding positioning groove, coiling press block is on coiling station, and the lower surface of coiling press block cooperates with the groove bottom of corresponding positioning groove;The lower die body includes at least one small bending flanging punch, at least one big bending flanging punch and at least one coiling flanging punch.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and in particular to a continuous die for rolling stamped parts. Background Technology

[0002] In the stamping process of automotive parts (such as pipe connectors, brackets, and clips), the rolling process is one of the core processes, and its forming accuracy directly determines the assembly compatibility and structural strength of the parts. Currently, the efficiency of single-station dies in automotive parts stamping production is low and cannot meet the needs of mass production: existing single-station rolling dies can only complete a single operation of single positioning and single rolling. The stamped part is transported from the feeding area to the die for positioning and rolling, and then transferred to the next operation (such as cutting and punching). This single rolling operation results in uneven stress on the material, causing the rolled part of the stamped part to not be completely round, thus failing to achieve the desired rolling effect. Utility Model Content

[0003] The problem to be solved by this utility model is to provide a continuous die for rolling stamping parts. This continuous die for rolling stamping parts enables the stamping parts to undergo progressive deformation, so that the stamping parts are subjected to uniform force at each stage, thereby achieving high-precision rolling processing.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A continuous die for rolling stamping parts includes an upper die and a lower die, and a die-closing drive mechanism capable of driving the upper die to open and close relative to the lower die. The upper die includes an upper die base and an upper die body, the upper die body being mounted on the upper die base; the lower die includes a lower die base and a lower die body, the lower die body being mounted on the lower die base; characterized in that: a small bending station, a large bending station, and a rolling station are sequentially arranged between the upper die and the lower die from front to back; the lower die base is provided with three positioning grooves capable of accommodating the stamping parts, the positioning grooves being sequentially connected from front to back, and the three positioning grooves being located sequentially at the small bending station, the large bending station, and the rolling station; the upper die body includes a small bending pressure block, a large bending pressure block, and a rolling pressure block, the small bending pressure block being located at the small bending station. The lower surface of the small bending block mates with the bottom of the corresponding positioning groove, the large bending block is located at the large bending station and its lower surface mates with the bottom of the corresponding positioning groove, and the rolling block is located at the rolling station and its lower surface mates with the bottom of the corresponding positioning groove; the lower mold body includes at least one small bending and flanging punch, at least one large bending and flanging punch, and at least one rolling and flanging punch. The small bending and flanging punch is located on the rear side of the corresponding positioning groove and mates with the lower rear part of the small bending block, the large bending and flanging punch is located on the rear side of the corresponding positioning groove and mates with the lower rear part of the large bending block, and the rolling and flanging punch is located on the rear side of the corresponding positioning groove and mates with the lower rear end face of the rolling block.

[0005] The above definitions of "front" and "back" are based on the conveying direction of the stamped parts. The side where the stamped parts arrive first is called "front," and the side where the stamped parts arrive later is called "back."

[0006] Typically, a feeding mechanism is provided between the upper and lower dies, traversing each of the positioning slots. This feeding mechanism transports the stamped part from the positioning slot to the positioning slot of the next workstation. This feeding mechanism is prior art and will not be described in detail here. The positioning slots are interconnected from front to back, allowing the feeding mechanism to traverse each workstation's positioning slot, automatically transporting the stamped part from the initial workstation to the subsequent workstation. Typically, the rear edge of the aforementioned flat stamped part has at least one stamping sheet that needs to be rolled.

[0007] During the small bend, the upper die is raised (separated from the lower die) by the die-closing drive mechanism, and the feeding mechanism transports the flat stamped part to the small bend station positioning slot of the lower die. Then, the upper die is lowered by the die-closing drive mechanism, and the small bend pressing block of the upper die body moves towards the small bend station positioning slot until it contacts the upper surface of the stamped part. The small bend pressing block presses down on the stamped part, while the small bend flanging punch of the lower die body supports the material upward. With the cooperation of the lower rear part of the small bend pressing block, the stamping sheet on the rear edge of the stamped part is guided to bend upward to form a small arc bend, which disperses the initial deformation stress of the material and avoids stress concentration caused by direct large-angle bending at a single station. The upper die is raised by the die-closing drive mechanism, and the feeding mechanism transports the stamped part that has completed the small bend laterally from the small bend station to the large bend station positioning slot of the next process, completing the first stage of deformation.

[0008] During the large bend, the upper die descends again, and the large bend pressure block contacts the stamped part in the positioning groove of the large bend station. With the large bend flanging punch and the lower rear part of the large bend pressure block correspondingly cooperating, the small arc bending part of the stamped part is guided to bend further upward to form a large bend. Then the upper die is driven to rise, and the feeding mechanism transports the stamped part after the large bend to the positioning groove of the rolling station to complete the second stage of deformation.

[0009] During the rolling process, the upper die descends for the third time, and the rolling pressure block contacts the stamped part in the rolling station positioning groove. The lower rear end of the rolling pressure block presses down on the large bend of the stamped part. Under the combined action of the rolling and flanging punch, the large bend of the stamped part is rolled into a nearly circular part. Finally, the mold closing drive mechanism drives the upper die to rise, and the feeding mechanism transports the rolled stamped part out of the mold and into the next process, completing one continuous rolling cycle.

[0010] In a preferred embodiment, the lower rear part of the small bending block is provided with at least one J-shaped protrusion. The upper front edge of the small bending and flanging punch is higher than the bottom of the corresponding positioning groove. The upper front part of the small bending and flanging punch is provided with a small bending arc surface that gradually extends upward from front to back, and the front edge of the small bending arc surface is flush with the bottom of the corresponding positioning groove. When the upper and lower dies are closed, the small bending arc surface engages with the J-shaped protrusion. When the upper and lower dies are closed, the J-shaped protrusion of the small bending block first contacts the rear edge of the upper surface of the stamped part. As the upper die continues to descend, the protruding area of ​​the J-shaped protrusion gradually presses against the rear edge of the upper surface of the stamped part, while guiding the rear edge of the stamped part to gradually bend upward from front to back along the small bending arc surface of the small bending and flanging punch, so that the rear edge of the stamped part forms a small-arc bend. The front edge of the small bending arc surface is flush with the bottom of the positioning groove, ensuring that the stamped part smoothly transitions from a horizontal state to a small-arc state.

[0011] In a preferred embodiment, the lower rear part of the large bending block is provided with at least one C-shaped protrusion. The upper front edge of the large bending and flanging punch is higher than the bottom of the corresponding positioning groove. The upper front part of the large bending and flanging punch is provided with a large bending arc surface that gradually extends upward from front to back, and the front edge of the large bending arc surface is flush with the bottom of the corresponding positioning groove. When the upper and lower dies are closed, the large bending arc surface engages with the C-shaped protrusion. The protruding part of the C-shaped protrusion is larger than the protruding part of the J-shaped protrusion. When the dies are closed, the protruding part of the C-shaped protrusion of the large bending block fits against the small-arc bending part of the stamped part. As the upper die descends, the protruding part of the C-shaped protrusion pushes the small-arc bending part of the stamped part toward the large bending and flanging punch, causing the small-arc bending part of the stamped part to bend further along the large bending arc surface that gradually extends upward from front to back, so that the small-arc bending part of the stamped part forms a large bending part.

[0012] In a further preferred embodiment, the rear side of the large bending block is provided with at least one bending groove with a rearward opening, and the bending groove is located above the corresponding C-shaped protrusion. During the large bend, the upper end of the small-radius bend of the stamped part is guided along the protrusion of the C-shaped protrusion into the bending groove, which can limit the upper end of the large bend in the bending groove and prevent the upper end of the large bend from springing back after bending.

[0013] In a preferred embodiment, the lower rear end face of the rolling block is provided with at least one rolling groove with an opening facing downwards. The bottom of the rolling groove is provided with an auxiliary rolling plane and a pressing arc groove from front to back. The highest point of the pressing arc groove is higher than the auxiliary rolling plane. The upper plane of the rolling and flanging punch is flush with the bottom of the corresponding positioning groove. The middle of the upper plane of the rolling and flanging punch is provided with a rolling arc surface that gradually extends upwards from front to back. When the upper and lower dies are closed, the rolling arc surface and the pressing arc groove cooperate to form a pressing groove with an opening facing forward. When the mold is closed, the rolling groove of the rolling pressure block first contacts the large bend of the stamped part through the auxiliary rolling plane and forms a block, bending the upper part of the large bend downward. As the upper mold continues to descend, the pressing arc groove (the bottom of the groove is arc-shaped) of the rolling groove and the rolling arc surface of the rolling and flanging punch, which extends upward from front to back, gradually approach each other. The two work together to form a pressing groove with the opening facing forward. Under the constraint of the pressing groove, the large bend of the stamped part gradually bends to 360°, and finally forms a circular part that is close to a circle.

[0014] Compared with the prior art, this utility model has the following advantages: This invention enables the stamped part to undergo progressive deformation through the continuous connection of three work stations: small bending, large bending, and rolling. The stamped part is subjected to uniform force at each stage, achieving high-precision rolling processing. Attached Figure Description

[0015] Figure 1 This is a structural schematic diagram of a specific embodiment of the present utility model; Figure 2 This is a schematic diagram of the continuous rolling structure of the stamped part according to a specific embodiment of this utility model. Detailed Implementation

[0016] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0017] like Figure 1-2As shown, the continuous die for rolling the stamped part in this embodiment includes an upper die and a lower die, as well as a die-closing drive mechanism (not shown in the figure) that can drive the upper die to open and close relative to the lower die. The upper die includes an upper die base 1 and an upper die body 2, with the upper die body 2 mounted on the upper die base 1. The lower die includes a lower die base 3 and a lower die body 4, with the lower die body 4 mounted on the lower die base 3. From front to back, a small bending station 11, a large bending station 12, and a rolling station 13 are arranged between the upper die and the lower die. The lower die base 3 is provided with three positioning slots 31 that can accommodate the stamped part 5. The positioning slots 31 are connected from front to back, and the three positioning slots 31 are located on the small bending station 11, the large bending station 12, and the rolling station 13, respectively. The upper die body 2 includes a small bending pressure block 21, a large bending pressure block 22, and a rolling pressure block 23. The small bending pressure block 21 is located on the small bending station 11. The lower surface of the small bending block 21 engages with the bottom of the corresponding positioning groove 31. The large bending block 22 is located on the large bending station 12, and its lower surface engages with the bottom of the corresponding positioning groove 31. The rolling block 23 is located on the rolling station 13, and its lower surface engages with the bottom of the corresponding positioning groove 31. The lower mold body 4 includes at least one small bending and flanging punch 41, at least one large bending and flanging punch 42, and at least one rolling and flanging punch 43. The small bending and flanging punch 41 is located on the rear side of the corresponding positioning groove 31 and engages with the lower rear part of the small bending block 21. The large bending and flanging punch 42 is located on the rear side of the corresponding positioning groove 31 and engages with the lower rear part of the large bending block 22. The rolling and flanging punch 43 is located on the rear side of the corresponding positioning groove 31 and engages with the lower rear end face of the rolling block 23.

[0018] The above definitions of "front" and "back" are based on the conveying direction of the stamped parts. The side where the stamped parts arrive first is called "front," and the side where the stamped parts arrive later is called "back."

[0019] Typically, a feeding mechanism is provided between the upper and lower dies, passing through each of the positioning slots 31. This feeding mechanism transports the stamped part 5 from the positioning slot 31 to the positioning slot 31 of the next workstation. This feeding mechanism is prior art and will not be described in detail here. The positioning slots 31 are interconnected from front to back, allowing the feeding mechanism to pass through each workstation's positioning slot 31 and automatically transport the stamped part 5 from the initial workstation to the subsequent workstation. Typically, the rear edge of the flat stamped part 5 has at least one stamping sheet 51 that needs to be rolled.

[0020] During the small bend, the upper die is raised (separated from the lower die) by the die closing drive mechanism, and the feeding mechanism transports the flat stamped part 5 to the positioning groove 31 of the small bend station 11 of the lower die. Then, the upper die is lowered by the die closing drive mechanism, and the small bend pressing block 21 of the upper die body 2 moves towards the positioning groove 31 of the small bend station 11 until it contacts the upper surface of the stamped part. The small bend pressing block 21 presses down on the stamped part, while the small bend flanging punch 41 of the lower die body 4 supports the material upward. With the cooperation of the lower rear part of the small bend pressing block 21, the stamping sheet 51 on the rear edge of the stamped part is guided to bend upward to form a small arc bend 52, which disperses the initial deformation stress of the material and avoids stress concentration caused by direct large-angle bending at a single station. The upper die is raised by the die closing drive mechanism, and the feeding mechanism transports the stamped part that has completed the small bend laterally from the small bend station 11 to the positioning groove 31 of the large bend station 12 of the next process to complete the first stage of deformation.

[0021] During the large bend, the upper die descends again, and the large bend pressure block 22 contacts the stamped part in the positioning groove 31 of the large bend station 12. With the large bend flanging punch 42 corresponding to the lower rear part of the large bend pressure block 22, the small arc bending part 52 of the stamped part is guided to bend further upward to form the large bend part 53. Then the upper die is driven to rise, and the feeding mechanism transports the stamped part after the large bend to the positioning groove 31 of the rolling station 13 to complete the second stage of deformation.

[0022] During the rolling process, the upper die descends for the third time, and the rolling pressure block 23 contacts the stamping part in the positioning groove 31 of the rolling station 13. The lower rear end of the rolling pressure block 23 presses down on the large bending part 53 of the stamping part. Under the combined action of the rolling and flanging punch 43, the large bending part 53 of the stamping part is rolled into a nearly circular part 54. Finally, the mold closing drive mechanism drives the upper die to rise, and the feeding mechanism transports the rolled stamping part out of the mold and into the next process, completing one continuous rolling cycle.

[0023] The lower rear part of the small bending pressure block 21 is provided with at least one J-shaped protrusion 211. The upper front edge of the small bending and flanging punch 41 is higher than the bottom of the corresponding positioning groove 31. The upper front part of the small bending and flanging punch 41 is provided with a small bending arc surface 411 that gradually extends upward from front to back. The front edge of the small bending arc surface 411 is flush with the bottom of the corresponding positioning groove 31. When the upper and lower dies are closed, the small bending arc surface 411 cooperates with the J-shaped protrusion 211. When the upper and lower dies are closed, the J-shaped protrusion 211 of the small bending pressure block 21 first contacts the rear edge of the upper surface of the stamped part. As the upper die continues to descend, the protruding area of ​​the J-shaped protrusion 211 gradually presses against the rear edge of the upper surface of the stamped part, and at the same time guides the rear edge of the stamped part to gradually bend upward from front to back along the small bending arc surface 411 of the small bending and flanging punch 41, so that the rear edge of the stamped part forms a small arc bending part 52. The front side of the small bend arc surface 411 is flush with the bottom of the positioning groove 31, ensuring that the stamped part smoothly transitions from a horizontal state to a small arc state.

[0024] The lower rear part of the large bending pressure block 22 is provided with at least one C-shaped protrusion 221. The upper front edge of the large bending flange punch 42 is higher than the bottom of the corresponding positioning groove 31. The upper front part of the large bending flange punch 42 is provided with a large bending arc surface 421 that gradually extends upward from front to back. The front edge of the large bending arc surface 421 is flush with the bottom of the corresponding positioning groove 31. When the upper and lower dies are closed, the large bending arc surface 421 engages with the C-shaped protrusion 221. The protruding part of the C-shaped protrusion 221 is larger than the protruding part of the J-shaped protrusion 211. When the mold is closed, the protruding part of the C-shaped protrusion 221 of the large bending pressure block 22 fits against the small arc bending part 52 of the stamping part. As the upper mold descends, the protruding part of the C-shaped protrusion 221 pushes the small arc bending part 52 of the stamping part to move towards the large bending flange punch 42, so that the small arc bending part 52 of the stamping part bends further along the large bending arc surface 421 that gradually extends upward from front to back, so that the small arc bending part 52 of the stamping part forms the large bending part 53.

[0025] The rear side of the large bending block 22 is provided with at least one bending groove 222 with a rearward opening, and the bending groove 222 is located above the corresponding C-shaped protrusion 221. During the large bending, the upper end of the small-arc bending portion 52 of the stamped part is guided along the protrusion of the C-shaped protrusion 221 into the bending groove 222, which can limit the upper end of the large bending portion 53 in the bending groove 222 and prevent the upper end of the large bending portion 53 from springing back after bending.

[0026] The lower rear end face of the rolling pressure block 23 is provided with at least one rolling groove 231 with the opening facing downward. The bottom of the rolling groove 231 is provided with an auxiliary rolling plane 2311 and a pressing arc groove 2312 from front to back. The highest point of the pressing arc groove 2312 is higher than the auxiliary rolling plane 2311. The upper plane of the rolling and flanging punch 43 is flush with the bottom of the corresponding positioning groove 31. The upper plane of the rolling and flanging punch 43 is provided with a rolling arc surface 431 that gradually extends upward from front to back in the middle. When the upper mold and the lower mold are closed, the rolling arc surface 431 and the pressing arc groove 2312 cooperate to form a pressing groove 432 with the opening facing forward. When the mold is closed, the rolling groove 231 of the rolling pressure block 23 first contacts the large bending part 53 of the stamping part through the auxiliary rolling plane 2311 and forms a block, bending the upper part of the large bending part 53 downward. As the upper mold continues to descend, the pressing arc groove 2312 (the bottom of the groove is arc-shaped) of the rolling groove 231 and the rolling arc surface 431” of the rolling and flanging punch 43 gradually approach each other from front to back. The two work together to form a pressing groove 432 with the opening facing forward. Under the constraint of the pressing groove 432, the large bending part 53 of the stamping part gradually bends to 360°, and finally forms a circular part 54 that is close to a circle.

[0027] Furthermore, it should be noted that the names of the various parts of the specific embodiments described in this specification may differ. All equivalent or simple variations made to the structure, features, and principles described in this utility model patent concept are included within the protection scope of this utility model patent. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not deviate from the structure of this utility model or exceed the scope defined in these claims, they should all fall within the protection scope of this utility model.

Claims

1. A continuous die for roll forming a punched part, comprising an upper die and a lower die, and a die closing driving mechanism capable of driving the upper die to open and close relative to the lower die, the upper die comprising an upper die base and an upper die body, the upper die body being mounted on the upper die base; the lower die comprising a lower die base and a lower die body, the lower die body being mounted on the lower die base; characterized in that: The upper and lower dies are sequentially arranged from front to back with a small bending station, a large bending station, and a rolling station. The lower die base has three positioning slots capable of accommodating the stamped part. These positioning slots are interconnected from front to back and are located sequentially at the small bending station, the large bending station, and the rolling station. The upper die body includes a small bending block, a large bending block, and a rolling block. The small bending block is located at the small bending station, and its lower surface mates with the bottom of the corresponding positioning slot. The large bending block is located at the large bending station, and its lower surface... The rolling block is positioned at the rolling station and its lower surface mates with the bottom of the corresponding positioning groove. The lower mold body includes at least one small bending and flanging punch, at least one large bending and flanging punch, and at least one rolling and flanging punch. The small bending and flanging punch is located on the rear side of the corresponding positioning groove and mates with the lower rear part of the small bending block. The large bending and flanging punch is located on the rear side of the corresponding positioning groove and mates with the lower rear part of the large bending block. The rolling and flanging punch is located on the rear side of the corresponding positioning groove and mates with the lower rear end face of the rolling block.

2. The continuous die for rolling stamped parts as described in claim 1, characterized in that: The lower rear part of the small bending pressure block is provided with at least one J-shaped protrusion. The upper front edge of the small bending flange punch is higher than the bottom of the corresponding positioning groove. The upper front part of the small bending flange punch is provided with a small bending arc surface that gradually extends upward from front to back. The front edge of the small bending arc surface is flush with the bottom of the corresponding positioning groove. When the upper and lower dies are closed, the small bending arc surface cooperates with the J-shaped protrusion.

3. The continuous die for rolling stamped parts as described in claim 1, characterized in that: The lower rear part of the large bending pressure block is provided with at least one C-shaped protrusion. The upper front edge of the large bending flange punch is higher than the bottom of the corresponding positioning groove. The upper front part of the large bending flange punch is provided with a large bending arc surface that gradually extends upward from front to back. The front edge of the large bending arc surface is flush with the bottom of the corresponding positioning groove. When the upper and lower dies are closed, the large bending arc surface cooperates with the C-shaped protrusion.

4. The continuous die for rolling stamped parts as described in claim 3, characterized in that: The rear side of the large bending block is provided with at least one bending groove with a rearward opening, and the bending groove is located above the corresponding C-shaped protrusion.

5. The continuous die for rolling stamped parts as described in claim 1, characterized in that: The lower rear end face of the rolling block is provided with at least one rolling groove with an opening facing downwards. The bottom of the rolling groove is provided with an auxiliary rolling plane and a pressing arc groove from front to back. The highest point of the pressing arc groove is higher than the auxiliary rolling plane. The upper plane of the rolling and flanging punch is flush with the bottom of the corresponding positioning groove. The middle of the upper plane of the rolling and flanging punch is provided with a rolling arc surface that gradually extends upwards from front to back. When the upper mold and the lower mold are closed, the rolling arc surface and the pressing arc groove cooperate to form a pressing groove with an opening facing forward.

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