Continuous Die for Stamping Large Chamfer at the End of Rolled Sleeve

Abstract

The present invention discloses a continuous die for stamping large chamfers at the ends of a coiled round sleeve. In the processing and conveying direction of the continuous die, a plurality of lifting devices are arranged in two columns on both sides of the processing area. A horizontally placed material plate is supported between the two columns of lifting devices. The long strip-shaped punching punch, chamfering punch, and fine cutting punch are successively arranged in sequence to form three stations, all horizontally placed and perpendicular to the processing and conveying direction. The punching punch and the fine cutting punch are both fixedly installed on the upper fixing plate above the material plate, and the chamfering punch is fixedly installed on the lower fixing plate below the material plate. The punching punch processes long strip-shaped punching holes at the material sheet separation on the material plate, the chamfering punch processes chamfers on the two long sides of the punching holes, and the fine cutting punch removes the bulging edges during chamfering. This continuous die ensures the processing requirements for large chamfers on both sides of the material sheet, forms an R arc transition at the root of the chamfer, has accurate chamfer dimensions, directly and effectively removes the filamentous burrs generated by chamfering, has a stable processing process, and the quality of the obtained products is stable.

Description

Technical Field

[0001] The present invention belongs to the technical field of manufacturing molds, and particularly relates to a stamping die for machining chamfers at the ends of coiled sleeves. Background Art

[0002] With the popularization and increasing ownership of new energy vehicles, it has become a major trend in the market development. At the same time, the safety of new energy vehicles cannot be ignored. The frame bushing of the chassis suspension system of new energy vehicles is an essential component in the rocker arm mechanism of automobiles. The frame bushing plays a role in protecting mechanical parts during the relative movement between the rocker arm and the shaft, preventing the loss of mechanical parts due to long-term friction, reducing wear between parts, reducing vibrations of the motor and transmission, improving the comfort and safety of vehicle rides, and extending the service life of parts.

[0003] The bushing is sleeved and assembled. During assembly, it is necessary to ensure no scratching and burring to prevent iron filings interference and filamentous burrs from affecting the accuracy. However, the chamfers at the upper and lower ends of some current bushings are relatively small and not easy to assemble. Therefore, it is necessary to machine large chamfers. However, the molds usually used for chamfering coiled sleeves such as bushings can only achieve small sizes with a chamfer radius within 0.5 mm or a deburring process. Machining large chamfers is a technological bottleneck. And obtaining large chamfers by machining will increase the processing cost of products. Moreover, the chamfer edges formed by machining will generate filamentous burrs, and a deburring process needs to be added, further increasing the processing cost and lowering the efficiency. Summary of the Invention

[0004] Object of the Invention: The present invention provides a stamping die for chamfering the ends of coiled sleeves, which can stamp and machine large chamfers on the sheet material of the coiled bushing without burrs.

[0005] Technical Solution: A continuous die for stamping large chamfers at the ends of coiled sleeves includes a lower die base, a lower fixed plate fixed above it, an upper die base, an upper fixed plate fixed below it, a punching punch, a chamfering punch, a fine cutting punch, and a lifting device. In the processing and conveying direction of the continuous die, multiple lifting devices are arranged in two columns on both sides of the processing area. The lifting devices are vertically installed on the lower fixed plate, and the upper ends extend out of the lower fixed plate. The horizontally placed sheet material is supported by the upper ends of the lifting devices between the two columns of lifting devices. The punching punch, the chamfering punch, and the fine cutting punch are arranged in sequence to form three stations. The long-strip punching punch, chamfering punch, and fine cutting punch are all horizontally placed and perpendicular to the processing and conveying direction. The punching punch and the fine cutting punch are both fixedly installed on the upper fixed plate above the sheet material, and the chamfering punch is fixedly installed on the lower fixed plate below the sheet material. The punching punch processes long-strip punching holes at the sheet material separation of the sheet material. The chamfering punch processes chamfers on the two long sides of the punching holes. The fine cutting punch removes the bulging edges during chamfering.

[0006] Further, both sides of the chamfer punch along the length direction are vertical punch surfaces, and a limiting surface extending outwards is arranged below the punch surfaces, and the limiting surface corresponds to the morphology and size of the large chamfer.

[0007] Further, it further includes a chamfer pressing component, the chamfer pressing component is installed on the upper fixing plate, and a chamfer limiting groove matching with the punch surface is arranged on the end surface of the chamfer pressing component facing the chamfer punch.

[0008] Further, the width spacing between the punch surfaces is smaller than the width of the punching hole processed by the punching punch, and the width difference between the two does not exceed 0.45 mm, serving as a stock expansion space.

[0009] Further, it further includes a strip-shaped material blocking block, the material blocking block is installed on the lower fixing plate, in the processing and conveying direction, the material blocking block is arranged prior to and in the same direction as the chamfer punch, the material blocking block is located at one long side of the punching hole of the sheet at the chamfer punch station, and the material blocking block limits the sheet on one side at the chamfer punch station to prevent the sheet from displacing during stock expansion.

[0010] Further, it further includes a fine cutting female die, the fine cutting female die is installed on the lower fixing plate and matches with the fine cutting punch for die assembly, and the upper surface of the fine cutting female die has a supporting surface consistent with the surface of the large chamfer.

[0011] Further, the lifting device includes a spring seat and a lifting pin arranged coaxially in the vertical direction, the lifting pin is installed on the spring seat, the spring seat penetrates through the lower die base, the lifting pin penetrates through the lower fixing plate, and the upper end of the lifting pin extends out of the lower fixing plate. The lifting device enables the sheet to switch between the conveying state and the processing state.

[0012] Further, a circumferential groove is arranged on the outer peripheral surface of the part of the lifting pin extending out of the lower fixing plate, and the horizontally placed sheet is inserted into the groove and supported.

[0013] Further, it further includes a stripper plate, the stripper plate is located below the upper fixing plate and is connected to the upper fixing plate through an elastic mechanism, and the lower ends of the punching punch and the fine cutting punch penetrate through the stripper plate.

[0014] Advantageous effects: The advantages of the present invention are as follows: This stamping and forming continuous die punches punching holes through the punching punch, punches large chamfers through the chamfer punch, and finely cuts and removes the stock expansion edge through the fine cutting punch, ensuring the processing requirements of large chamfers on both sides of the sheet, forming an R arc transition at the root of the chamfer, with accurate chamfer dimensions, directly and effectively removing the filamentous burrs generated by the chamfer, without the need for machining and deburring processes during the processing, with stable processing technology and stable product quality. Description of the Drawings

[0015] Figure 1 The main view of the structure of the present invention

[0016] Figure 2 for Figure 1 A-direction view;

[0017] Figure 3 This is the front view of the chamfering punch;

[0018] Figure 4 for Figure 3 A top view of

[0019] Figure 5 for Figure 3 Right view of;

[0020] Figure 6 It is the front view of the chamfered component;

[0021] Figure 7 The main view of the precision cutting die

[0022] Figure 8 It is a schematic diagram of the blank before processing at the chamfering punch and fine cutting punch stations;

[0023] Figure 9 This is a schematic diagram of the blank being processed at the chamfering punch and fine cutting punch stations. DETAILED DESCRIPTION

[0024] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments.

[0025] A continuous die for stamping and forming a large chamfered end of a rolled sleeve, as shown in the attached Figure 1 , 2 As shown, it includes a lower die base 1, a lower fixed plate 2, an upper die base 3, an upper fixed plate 4, a punching punch 5, a chamfering punch 6, a fine cutting punch 7, a floating device 8, a chamfering component 9, a stop block 10, a fine cutting die 11, and a discharge plate 12.

[0026] The lower die base 1, the lower fixed plate 2, the upper die base 3, the upper fixed plate 4, and the unloading plate 12 constitute the basic structure of a conventional continuous die. The lower die base 1, the lower fixed plate 2, the unloading plate 12, the upper fixed plate 4, and the upper die base 3 are arranged opposite to each other from bottom to top. The lower fixed plate 2 is fixed on the top of the lower die base 1, and the two constitute the lower die. The upper fixed plate 4 is fixed on the bottom of the upper die base 3. The unloading plate 12 is located below the upper fixed plate 4 and is connected to the upper fixed plate 4 through an elastic mechanism 13. The three constitute the upper die. Pads can be arranged between the lower die base 1 and the lower fixed plate 2, between the unloading plate 12 and the upper fixed plate 4, and between the upper fixed plate 4 and the upper die base 3. The upper die and the lower die are connected by a guide mechanism to enable them to be molded and separated.

[0027] The processing of the coiled round sleeve involves multiple processes. The material plate can be fed into the progressive die at a fixed pitch, and each process can be completed at each station on the progressive die in sequence. This application is concerned with machining a large chamfer at the end of the coiled round sleeve. The structure of the processes involved in machining the large chamfer at the end is only shown on the progressive die attached Figure 1 、 2 .

[0028] In the processing and conveying direction of the progressive die, the punching punch 5, the chamfering punch 6, and the fine cutting punch 7 are arranged in sequence to form three stations. The punching punch 5, the chamfering punch 6, and the fine cutting punch 7 are all strip-shaped, are all horizontally placed relative to the progressive die, and are arranged perpendicular to the processing and conveying direction.

[0029] In the processing and conveying direction of the progressive die, multiple lifter devices 8 are arranged in two columns on both sides of the processing area composed of each station (only part of the lifter devices are shown in the attachment Figure 1 ). The lifter device 8 is vertically installed on the lower die. The lifter device 8 includes a spring seat 801 and a lifter pin 802, which are vertically coaxially arranged. The lower end of the lifter pin 802 is installed and connected to the upper end of the spring seat 801. The spring seat 801 is passed through and installed on the lower die base 1, and the lifter pin 802 is passed through the lower fixing plate 2. The upper end of the lifter pin 802 extends out of the surface of the lower fixing plate 2. On the extended part, a circumferential groove 803 is provided on the outer peripheral surface. The horizontally placed material plate 14 is between the two columns of lifter devices 8 and is supported by being inserted into the groove 803. There is a gap between the material plate 14 and the surface of the lower fixing plate 2.

[0030] When the dies are closed, the upper die presses down on the material plate, the lifter pin moves downward, driving the material plate downward to fit with the surface of the lower fixing plate. The stripper plate presses on the material plate, and the elastic mechanism presses on the stripper plate, and the processing components at each station work. When the dies are opened, the upper die moves upward. The stripper plate generates a downward force on the material plate under the downward force generated by the reset of the elastic mechanism, so that the material plate is separated from the processing components acting on the material plate on the upper die and does not follow the upper die upward due to adhesion, etc. The lifter pin resets upward, driving the material plate upward to maintain a gap with the surface of the lower fixing plate, and then conveys forward.

[0031] The punching punch 5 is fixedly installed on the upper fixing plate 4. The lower end of the punching punch 5 passes through the stripper plate 12, and the punching punch 5 is above the material plate 14. In the relevant processes before the punching punch station, the material piece 1401 has been punched out on the material plate 14, and the material piece 1401 is still connected to the material plate 14 and is conveyed with the material plate. At the punching punch station, a long strip-shaped punching 15 is processed through the punching punch at the separation of adjacent material pieces 1401.

[0032] The chamfering punch 6 is fixedly installed on the lower fixing plate 2 and is below the material plate 14 when the dies are opened. Combined with the attachment Figures 3 to 5As shown, on both sides of the chamfering punch 6 along its length direction are vertical punch surfaces 601. Below the punch surfaces 601 are provided limiting surfaces 602 extending outwards. Combining with the attached Figure 8 As shown, the width spacing between the punch surfaces on both sides is smaller than the punching width, having a width difference D. The pressing chamfering component 9 is installed on the stripper plate 12 where the upper die directly contacts the material plate 14 during mold closing. Combining with the attached Figure 6 , 8 As shown, the pressing chamfering component 9 is opposite to the chamfering punch 6. On the end face of the pressing chamfering component 9 facing the chamfering punch 6 is provided a chamfer limiting groove 901. The width of the chamfer limiting groove 901 matches the width spacing between the punch surfaces 601 on both sides, so that they are press-fitted with each other during mold closing. The stop block 10 is strip-shaped. The stop block 10 is installed on the lower fixing plate 2. In the conveying direction of the progressive die processing, the stop block 10 is ahead of the chamfering punch 6 and arranged in the same direction as the length direction of the chamfering punch 6. The stop block 10 is located at one long side of the punching hole of the material piece at the chamfering punch station.

[0033] The fine blanking punch 7 is fixedly installed with the upper fixing plate 4. The lower end of the fine blanking punch 7 penetrates through the stripper plate 12. The fine blanking punch 7 is above the material plate 14. The fine blanking die 11 is installed on the lower fixing plate 2. The fine blanking die 11 is opposite to the fine blanking punch 7. Combining with the attached Figure 7 As shown, the upper surface of the fine blanking die 11 has a supporting surface 1101, and the supporting surface is consistent with the surface of the chamfer processed at the chamfering punch station.

[0034] As shown in the attached Figure 8 , 9 As shown, at the chamfering punch station, before mold closing, the two long sides of the punching hole are vertical sides. During mold closing, the chamfering punch moves upwards from the punching hole. The limiting surfaces and the punch surfaces on both sides act on the two long sides of the punching hole from the lower surface of the material piece. The pressing chamfering component presses from the upper surface of the material piece. Since the chamfer limiting groove is press-fitted with the punch surfaces on both sides, the stop block abuts and limits it on the left side of the left material piece to prevent the left material piece from moving leftwards. The fine blanking punch abuts and limits it on the right side of the right material piece to prevent the right material piece from moving rightwards. Under the combined action, the limiting surface punches and extrudes the material on the lower surface of the material piece in this area, and the material piece bulges only towards the gap between the punch surface and the punching hole (i.e., the gap space with the width difference D), forming a bulging edge 16. Thus, chamfers are punched on the two long sides of the punching hole from the lower surface of the material piece by the chamfering punch. It can be seen that the morphology and size of the chamfer are formed corresponding to the limiting surface. By designing the limiting surface, large chamfers can be punched correspondingly. Usually, the width difference D is designed not to exceed 0.45 mm. In addition, the height of the punch surface is designed to be higher than the upper surface of the material plate during mold closing, so that the press-fitting of the chamfer limiting groove and the punch surface effectively limits the bulging towards the gap space with the width difference D, and the upper surface of the material piece near the long side of the punching hole does not warp and deform during chamfer punching.

[0035] As shown in the attached Figure 8 、 9 figure, at the fine blanking punch station, the supporting surface fits and supports the lower surface of the sheet material and the chamfered surface. The fine blanking punch extends downward from the upper side of the sheet material into the fine blanking die to remove the bulging edge during chamfering.

[0036] So far, the machining of the large chamfers on the long sides of the sheet material is completed. In the subsequent machining process, the sheet material is divided into individual pieces, and each piece is made into a coiled sleeve. The large chamfers on the long sides of the sheet material are the large chamfers at the ends of the coiled sleeves.

[0037] In the stamping and forming progressive die of the present invention, the punching punch punches the holes, the chamfering punch punches the large chamfers, and the fine blanking punch finely blanks to remove the bulging edge, ensuring the machining requirements for the large chamfers on both sides of the sheet material. An R arc transition is formed at the root of the chamfer, the chamfer size is accurate, the filamentous burrs generated by the chamfering are directly and effectively removed, the machining process does not require machining and deburring processes, the machining process is stable, and the quality of the obtained products is stable.

Claims

1. A continuous die for stamping large chamfers at the ends of a coiled round sleeve, characterized in that: It includes a lower die base (1), a lower fixed plate (2) fixed above it, an upper die base (3), an upper fixed plate (4) fixed below it, a punching punch (5), a chamfering punch (6), a fine cutting punch (7), and a lifting device (8). In the processing and conveying direction of the progressive die, multiple lifting devices (8) are arranged in two columns on both sides of the processing area. The lifting devices (8) are vertically installed on the lower fixed plate (2), and the upper ends extend out of the lower fixed plate (2). The flat stock plate is supported by the upper ends of the two columns of lifting devices (8). The punching punch (5), the chamfering punch (6), and the fine cutting punch (7) are arranged in sequence to form three stations. The long strip-shaped punching punch (5), chamfering punch (6), and fine cutting punch (7) are all flat and perpendicular to the processing and conveying direction. The punching punch (5) and the fine cutting punch (7) are both installed and fixed on the upper fixed plate (4) above the stock plate, and the chamfering punch (6) is installed and fixed on the lower fixed plate (2) below the stock plate. The punching punch (5) processes a long strip-shaped punching at the sheet separation of the stock plate. The chamfering punch (6) processes chamfers on the two long sides of the punching. The fine cutting punch (7) removes the bulging edge during chamfering; Both sides of the chamfering punch (6) along the length direction are vertical punch profiles (601), and a limiting profile (602) extending outward is provided below the punch profile (601). It further includes a chamfer pressing component (9). The chamfer pressing component (9) is installed on the upper fixed plate (4). On the end face of the chamfer pressing component (9) facing the chamfering punch (6), a chamfer limiting groove (901) matching the punch profile (601) for die closing is provided. The width spacing between the punch profiles (601) is smaller than the width of the punching processed by the punching punch (5); It further includes a long strip-shaped stop block (10). The stop block (10) is installed on the lower fixed plate (2). In the processing and conveying direction, the stop block (10) is arranged prior to and in the same direction as the chamfering punch (6). The stop block (10) is located at one long side of the punching of the sheet in the station of the chamfering punch (6).

2. The continuous die for stamping and forming large chamfers at the ends of a coiled round sleeve according to claim 1, characterized in that: The width difference between the width spacing between the punch profiles (601) and the width of the punching processed by the punching punch (5) does not exceed 0.45 mm.

3. The continuous die for stamping the large chamfer at the end of the curling sleeve according to claim 1, wherein: It further includes a fine cutting female die (11). The fine cutting female die (11) is installed on the lower fixed plate (2) to match and cooperate with the fine cutting punch (7). The upper surface of the fine cutting female die (11) has a supporting profile (1101) consistent with the profile of the large chamfer.

4. The continuous die for stamping and forming a large chamfer at the end of a coiled sleeve according to claim 1, wherein: The lifting device (8) includes a spring seat (801) and a lifting pin (802) arranged coaxially in the vertical direction. The lifting pin (802) is installed on the spring seat (801). The spring seat (801) passes through the lower die base (1), and the lifting pin (802) passes through the lower fixed plate (2). The upper end of the lifting pin (802) extends out of the lower fixed plate (2).

5. The continuous die for stamping the large chamfer at the end of the curling sleeve according to claim 4, wherein: The part of the lifting pin (802) extending out of the lower fixing plate (2) is provided with a circumferential groove (803) on the outer peripheral surface, and the horizontally placed material plate extends into the groove (803) and is supported.

6. The continuous die for stamping the large chamfer at the end of the curling sleeve according to claim 1, characterized in that: It further includes a stripper plate (12). The stripper plate (12) is located below the upper fixing plate (4) and is connected to the upper fixing plate (4) through an elastic mechanism (13). The lower ends of the punching punch (5) and the fine blanking punch (7) penetrate through the stripper plate (12).

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