CN218475874U - Precision folding semicircle application progressive die - Google Patents

Abstract

The utility model provides an accurate semicircle of rolling over is used and upgrades mould, including the station of once bending, the secondary that sets gradually the station of bending, the station of triple bending, the station of once bending on be provided with bending device for carry out the quadrant to the product blank and bend, the secondary be provided with secondary bending device on bending the station, be used for carrying out the third circle to the product blank and bend, the cubic be provided with cubic bending device on bending the station for carry out the semicircle to the product blank and bend. Use the utility model is used for thick to product material, the support frame product that the part is little carries out precision finishing, makes the product can satisfy the high requirement of bending, and the size needs undulant little in order to influence the assembly.

Description

Precision folding semicircle application progressive die

Technical Field

The utility model relates to a mould processing technology field upgrades especially relates to an accurate semicircle of rolling over is used and upgrades mould.

Background

The progressive die is a relatively advanced die in the current stage production and processing, integrates a single-process die and combines a plurality of pairs of dies together, thereby realizing the automatic production of various processes, having the advantages of good processing quality, high production efficiency, few operators and the like, and being a great direction for the design and development of the die in the stage.

The holder product part for an engine shown in fig. 1 is applied to a VVL engine of an automobile, and therefore, the size of the product is highly required. Due to the characteristics of large product demand, thick material, small parts, toothed structure, semicircular forming and the like, if the conventional process is used for decomposing and shearing the broken semicircle step by step, the product has unstable size due to large trimming and burr and forming. Therefore, a precise folding semicircle application progressive die needs to be invented.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an accurate semicircle of rolling over is used and is advanced mould for thick to product material, the back-up frame product that the part is little carries out precision finishing, makes the product can satisfy the high requirement of bending, and the size needs undulant little in order to influence the assembly.

The utility model provides a technical scheme that its technical problem adopted is:

a precision semi-circle bending application progressive die comprises a primary bending station, a secondary bending station and a tertiary bending station which are sequentially arranged, wherein a primary bending device is arranged on the primary bending station, a secondary bending device is arranged on the secondary bending station, and a tertiary bending device is arranged on the tertiary bending station;

the primary bending device comprises a first upper bending die and a first lower bending die, wherein the first upper bending die comprises a first upper bending template and a first upper die stripper plate arranged below the first upper bending template; a first bending upper male die is fixedly arranged in the first upper die discharging plate, and a first R angle is arranged at the lower left corner of the first bending upper male die; the first bending lower die comprises a first lower die plate, a first bending lower female die is fixedly arranged in the first lower die plate, and a first R-shaped corner groove is formed in the upper right corner of the first bending lower female die; when the product is bent for the first time, a quarter-circle structure is bent by matching a first R angle of the first bending upper male die and a first R angle groove of the first bending lower female die;

the secondary bending device comprises a second upper bending die and a second lower bending die, the second upper bending die comprises a second upper bending die plate and a second upper die stripper plate arranged below the second upper bending die plate; an upper sliding block male die is fixedly arranged in the second bending upper die plate, penetrates through a second upper die discharging plate, and an inclined surface is arranged at the lower right corner of the upper sliding block male die; the second bending lower die comprises a second lower die plate, a second bending lower female die is fixedly arranged in the second lower die plate, a second R-angle groove is formed in the upper right corner of the second bending lower female die, a sliding block male die limiting block is arranged on the right side of the second bending lower female die, a lower sliding block male die is movably arranged in the sliding block male die limiting block, and the lower sliding block male die can move towards the upper right direction or the lower left direction; the left side of the head part of the lower sliding block male die is provided with an inclined plane which inclines towards the lower left side, and the inclined plane of the lower sliding block male die corresponds to the inclined plane of the upper sliding block male die in parallel; a second R angle is arranged at the lower left corner of the lower sliding block convex die head; when the product is bent for the second time, the product is bent into a one-third round structure through the cooperation of the inclined plane of the male die of the upper sliding block, the second R angle groove and the second R angle;

the third bending device comprises a third bending upper die and a third bending lower die, the third bending upper die comprises a third bending upper die plate and a third upper die stripper plate arranged below the third bending upper die plate; a wedge is fixedly arranged in the third bending upper template, an inclined plane is arranged at the lower right corner of the wedge, the wedge penetrates through a third upper die discharging plate, a forming sliding block is movably arranged in the third upper die discharging plate, a sliding block spring is arranged on the right side of the forming sliding block, an inclined plane matched with the wedge is arranged at the upper left corner of the forming sliding block, and a third R-shaped corner slot is arranged at the lower right corner of the forming sliding block; a third bending lower male die is fixedly arranged in the third bending lower die, and a fourth R-shaped groove is formed in the upper right corner of the third bending lower male die; a third bending lower female die is arranged on the right side of the third bending lower male die, and the left side of the head of the third bending lower female die is of a semicircular structure; when the product is bent for three times, the product is bent into a semicircular structure through the matching of the outer semicircle formed by the third R angle groove and the fourth R angle groove and the matching of the inner semicircle at the head part of the third bending lower female die.

Furthermore, a first upper die unloading spring for pushing the first upper die unloading plate open is arranged in the first bending upper die plate; the first bending upper template is also provided with a first limiting hanging plate used for limiting the first upper die discharging plate.

Furthermore, a first lower discharging mechanism is further arranged in the first lower template, and the first lower discharging mechanism comprises a first lower die discharging spring, a first lower ejector rod arranged on the first lower die discharging spring, and a discharging block arranged on the first lower ejector rod.

Furthermore, a second upper die discharging spring for pushing a second upper die discharging plate is arranged in the second bent upper die plate; the second bending upper die plate is also provided with a second limiting hanging plate for limiting a second upper die discharging plate.

Furthermore, a pressing block is fixedly arranged in the second upper die discharging plate and used for pressing the lower sliding block male die downwards.

Furthermore, a second lower discharging mechanism is further arranged in the second lower template and comprises a second lower die discharging spring and a second lower ejector rod arranged on the second lower die discharging spring, and the lower sliding block male die is arranged above the second lower ejector rod.

Furthermore, a third upper die discharging spring for pushing a third upper die discharging plate is arranged in the third bent upper die plate; and a third limiting hanging plate for limiting a third upper die discharging plate is further arranged on the third bending upper die plate.

Furthermore, a third lower discharging mechanism is arranged in the third bending lower die and comprises a third lower die discharging spring and a third lower ejector rod arranged on the third lower die discharging spring, and a third bending lower female die is arranged above the third lower ejector rod.

Further, the precision folding semicircle application progressive die further comprises the following forming stations which are sequentially arranged: the device comprises a rib pressing chamfering and pilot hole punching station, a primary punching and cutting station, a secondary punching and cutting station, a tertiary punching and cutting station, a primary chamfering station, a secondary chamfering station, a trimming station, a quartic bending station and a trimming blanking station; the rib pressing chamfering and pilot hole punching station, the primary punching and cutting station, the secondary punching and cutting station, the tertiary punching and cutting station, the primary chamfering station and the secondary chamfering station are arranged in front of the primary bending station; the edge cutting station is arranged between the primary bending station and the secondary bending station, and the quartic bending station and the edge cutting blanking station are arranged behind the tertiary bending station.

Furthermore, a plurality of idle stations for improving the strength of the die parts are arranged between the forming stations.

The utility model has the advantages that: compared with the traditional mode of processing such parts step by step through a plurality of sets of dies, the three-step circular arc bending die has higher processing precision, effectively ensures the dimensional stability of the bent product, and has small size fluctuation and can not influence the assembly of subsequent products; the processing efficiency is greatly improved, the requirement of mass production can be met, and meanwhile, the labor cost and the material cost are also greatly reduced.

The present invention will be described in more detail with reference to the accompanying drawings and examples.

Drawings

Fig. 1 is a structural diagram of the product of the present invention.

Fig. 2 is the utility model relates to a mould design layout drawing of mould is advanced in accurate semicircle of rolling over application.

Fig. 3 is a structural view of the open state of the primary bending device of the present invention.

Fig. 4 is a structure diagram of the closed state of the primary bending device of the present invention.

Fig. 5 is the open structure view of the secondary bending device of the present invention.

Fig. 6 is a structure diagram of the closed state of the middle secondary bending device of the present invention.

Fig. 7 is a structural view of the open state of the triple bending device of the present invention.

Fig. 8 is a structure diagram of the closed state of the triple bending device of the present invention.

Detailed Description

A progressive die for precise folding of a semicircle is shown in figure 2 and is divided into 12 main stations from g1 to g 12. According to the feeding direction from front to back, wherein g1 is a rib pressing chamfering and guide hole punching station which is used for carrying out forced beating rib pressing chamfering on a product blank and punching a guide positive hole on a material belt so as to provide high-precision positioning for each subsequent forming station; g2, a primary punching and cutting station, which is used for punching part of the carrier of the product on the material belt and finishing the blanking of the outline of the product blank; g3, a secondary punching and cutting station, which is used for punching part of the carrier of the product on the material belt and finishing the blanking of the outline of the blank of the product; g4, a third punching and cutting station for punching part of the carrier of the product on the material belt and finishing the blanking of the outline of the product blank; g5 is a primary chamfering station for removing burrs and quick openings left after punching and cutting; g6 is a secondary chamfering station for removing burrs and quick openings left after punching and cutting; g7, a primary bending station is provided with a primary bending device and is used for bending a quarter circle on the product blank; g8, an edge cutting station which is used for mainly finishing the blanking of the product blank outline; g9 is a secondary bending station, and is provided with a secondary bending device for bending one third of a circle on a product blank; g10 is a tertiary bending station, and is provided with a tertiary bending device for performing semicircular bending on the product blank; g11 is a four-time bending and shaping station used for bending and shaping the produced blank; g12 is a trimming and blanking station. The continuous punch forming of the whole product is completed through the stations. The utility model discloses the key point of description lies in g7 once bending station, g9 secondary station and the g10 cubic station of bending, and all the other settings are the empty station of technology that sets up for the shaping product, and main aim at improves the intensity of mould part, guarantees mould length, makes the mould accord with punch press atress scope, the even atress of each shaping blanking process step, or assistance-localization real-time etc. do not explain in detail one by one here.

As shown in fig. 3 and 4, the primary bending device includes a first upper bending die and a first lower bending die, the first upper bending die includes a first upper bending die plate 10, and a first upper die stripper plate 11 disposed below the first upper bending die plate 10; a first bending upper male die 12 is fixedly arranged in the first upper die discharging plate 11, and a first R angle is arranged at the lower left corner of the first bending upper male die 12; in order to facilitate the fixed bending of the upper male die 12, a male die fixing block 13 can be arranged in the first upper die discharging plate 11; the first bending lower die comprises a first lower die plate 20, a first bending lower female die 21 is fixedly arranged in the first lower die plate 20, and a first R corner groove is formed in the upper right corner of the first bending lower female die 21; when the product is bent for the first time, a quarter-circle structure is bent by matching a first R angle of the first bending upper male die 12 and a first R angle groove of the first bending lower female die 21;

as shown in fig. 5 and 6, the secondary bending device includes a second upper bending die and a second lower bending die, the second upper bending die includes a second upper bending die plate 30, and a second upper die stripper plate 31 disposed below the second upper bending die plate 30; an upper sliding block male die 32 is fixedly arranged in the second bending upper die plate 30, the upper sliding block male die 32 penetrates through a second upper die discharging plate 31, and an inclined surface is arranged at the lower right corner of the upper sliding block male die 32; the second bending lower die comprises a second lower die plate 40, a second bending lower female die 41 is fixedly arranged in the second lower die plate 40, a second R-angle groove is formed in the upper right corner of the second bending lower female die 41, a sliding block male die limiting block 43 is arranged on the right side of the second bending lower female die 41, a lower sliding block male die 42 is movably arranged in the sliding block male die limiting block 43, and the lower sliding block male die 42 can move towards the upper right direction or the lower left direction; in order to facilitate sliding, a trapezoidal groove can be arranged in the slider male die limiting block 43, and a trapezoidal boss matched with the trapezoidal groove is arranged on the lower slider male die 42; the left side of the head of the lower sliding block male die 42 is provided with an inclined surface which inclines towards the lower left, and the inclined surface of the lower sliding block male die 42 is parallel and corresponding to the inclined surface of the upper sliding block male die 32; a second R angle is arranged at the lower left corner of the head part of the lower sliding block male die 42; when the product is bent for the second time, the product is bent into a one-third circular structure through the cooperation of the inclined plane of the upper sliding block male die 32, the second R angle groove and the second R angle;

as shown in fig. 7 and 8, the third bending device includes a third upper bending die and a third lower bending die, the third upper bending die includes a third upper bending die plate 50, and a third upper die discharging plate 51 disposed below the third upper bending die plate 50; a wedge 52 is fixedly arranged in the third bending upper die plate 50, an inclined surface is arranged at the lower right corner of the wedge 52, the wedge 52 passes through a third upper die discharging plate 51, a forming sliding block 53 is movably arranged in the third upper die discharging plate 51, a sliding block spring 54 is arranged at the right side of the forming sliding block 53, an inclined surface matched with the wedge 52 is arranged at the upper left corner of the forming sliding block 53, and a third R-shaped corner groove is arranged at the lower right corner of the forming sliding block 53; a third bending lower male die 62 is fixedly arranged in the third bending lower die, and a fourth R-shaped groove is formed in the upper right corner of the third bending lower male die 62; a third bending lower female die 63 is arranged on the right side of the third bending lower male die 62, and the left side of the head of the third bending lower female die 63 is of a semicircular structure; when the product is bent for three times, the product is bent into a semicircular structure through the matching of the outer semicircle formed by the third R corner groove and the fourth R corner groove and the matching of the inner semicircle at the head part of the third bending lower female die 63.

Preferably, in order to facilitate the discharging, a first upper die discharging spring 14 for pushing the first upper die discharging plate 11 is provided in the first bent upper die plate 10; in order to control the stroke of the first upper die stripper plate 11 and hang the first upper die stripper plate 11 to prevent the first upper die stripper plate from falling, the first bending upper die plate 10 is further provided with a first limiting hanging plate 15 for limiting the first upper die stripper plate 11.

Preferably, in order to facilitate pushing the product blank upwards for discharging, the first lower die plate 20 is further provided with a first lower discharging mechanism 22, and the first lower discharging mechanism comprises a first lower die discharging spring 223, a first lower mandril 222 arranged on the first lower die discharging spring 223, and a discharging block 221 arranged on the first lower mandril 222.

Preferably, in order to facilitate the discharging, a second upper mold discharging spring 34 for pushing the second upper mold discharging plate 31 is provided in the second bent upper mold plate 30; in order to control the stroke of the second upper die stripper plate 31 and hang the second upper die stripper plate 31 to prevent the second upper die stripper plate 31 from falling, the second bending upper die plate 30 is further provided with a second limiting hanging plate 35 for limiting the second upper die stripper plate 31.

Preferably, in order to press the lower sliding block male die 42 to slide towards the lower left side and better bend the product blank, a pressing block 33 is further fixedly arranged in the second upper die discharging plate 31, and the pressing block 33 is used for pressing the lower sliding block male die 42.

Preferably, in order to provide a sliding elastic force to the lower sliding block punch 42, a second lower discharging mechanism 44 is further disposed in the second lower die plate 40, the second lower discharging mechanism 44 includes a second lower die discharging spring 442, a second lower ejector pin 441 disposed on the second lower die discharging spring 442, and the lower sliding block punch 42 is disposed above the second lower ejector pin 441.

Preferably, for facilitating the discharging, a third upper die discharging spring 55 for pushing open the third upper die discharging plate 51 is provided in the third bent upper die plate 50; in order to control the stroke of the third upper die stripper 51 and hang the third upper die stripper 51 to prevent the third upper die stripper 51 from falling, the third bending upper die plate 50 is further provided with a third limiting hanging plate 56 for limiting the third upper die stripper 51.

Preferably, in order to facilitate pushing the product blank upwards for discharging, a third lower discharging mechanism 64 is arranged in the third bending lower die, the third lower discharging mechanism 64 includes a third lower die discharging spring 642 and a third lower ejector rod 641 arranged on the third lower die discharging spring 642, and the third bending lower concave die 63 is arranged above the third lower ejector rod 641.

Preferably, the precision folding semicircle application progressive die further comprises the following forming stations which are arranged in sequence: rib pressing chamfering and pilot hole punching station, primary punching and cutting station, secondary punching and cutting station, tertiary punching and cutting station, primary chamfering station, secondary chamfering station, trimming station, quaternary bending station and trimming blanking station; the rib pressing chamfering and guide hole punching station, the primary punching and cutting station, the secondary punching and cutting station, the tertiary punching and cutting station, the primary chamfering station and the secondary chamfering station are arranged in front of the primary bending station; the edge cutting station is arranged between the primary bending station and the secondary bending station, and the quartic bending station and the edge cutting blanking station are arranged behind the tertiary bending station.

Preferably, a plurality of idle stations for improving the strength of the die parts are arranged between the forming stations.

The principle of the utility model is as follows:

as shown in fig. 3, when the punch press drives the first upper bending die to move upward to a vertex, the feeder conveys a product finished in a previous process onto the first lower bending die according to a material supporting belt, and then the punch press drives the first upper bending die to close the die downward, in the process of closing the die downward, the first upper die discharging plate 11 contacts with a product blank first, the first upper bending die 12 presses the product downward, the first upper die discharging spring 14 starts to be stressed and retracted, and the first upper bending die plate 10 is gradually closed with the first upper die discharging plate 11; at this time, the discharging block 221 and the first lower ejector rod 222 are forced to retract, and the first lower die discharging spring 223 contracts; the product blank is bent into a quarter circle structure through the matching of the first R angle of the first bending upper male die 12 and the first R angle groove of the first bending lower female die 21, and the bending angle of the blank is 90 degrees; and as shown in fig. 4, when the punch press runs to the limit, the quarter-circle bending forming of the product blank is completed at the same time. After the quarter circle bending of the product is finished, the punch drives the first bending upper die to move upwards, and the first upper die discharging spring 14 pushes the first upper die discharging plate 11 away first, so that the product is discharged. As described above, the dies are opened and closed back and forth, completing the stamping of one product blank at a time.

As shown in fig. 5, when the punch press drives the second upper bending die to move upward to a vertex, the feeder conveys a product finished in a previous process to the second lower bending die according to a material supporting belt, and then the punch press drives the second upper bending die to close the die downward, in the process of closing downward, the second upper die discharging plate 31 contacts with a product blank first, the upper sliding block male die 32 contacts with the side edge of the product, the second upper die discharging spring 34 starts to retract under stress, the second upper bending die plate 30 gradually closes with the second upper die discharging plate 31, and the upper sliding block male die 32 contacts with the second lower bending die 41; meanwhile, the press block 33 also presses down the lower sliding block male die 42, the second lower die discharging spring 442 and the second lower ejector rod 441 are stressed to retract, the lower sliding block male die 42 moves towards the left direction, the inclined surface of the upper sliding block male die 32 is matched with the inclined surface of the head of the lower sliding block male die 42 to limit the two sides of the product blank, the product blank is continuously bent into a one-third round structure through a second R angle of the head of the lower sliding block male die 42 and a second R angle groove of the second bending lower female die 41, and the bending angle of the blank is 60 degrees; and as shown in fig. 6, when the punch press runs to the limit, the bending forming of the one third circle of the product blank is completed at the same time. After one third round bending of the product is finished, the punch drives the second bending upper die to move upwards, the second upper die discharging spring 34 pushes the second upper die discharging plate 31 away first, and the second lower discharging mechanism 44 also pushes the lower slider male die 42 upwards, so that the product is discharged. As described above, the dies are opened and closed back and forth, completing the stamping of one product blank at a time.

The initial state of the third-time bending device is as shown in fig. 7, when the punch press drives the third upper bending die to move upwards to the vertex, the feeder conveys the product finished in the previous process to the third lower bending die according to a material supporting belt, the punch press drives the third upper bending die to close the die downwards, the forming slide block 53 is contacted with a product blank in the process of closing downwards, the third lower bending die 63 and the third lower ejector rod 641 start to retreat, and the third lower die unloading spring 642 is stressed to contract; the first bent upper template 10 is gradually closed with the first upper die discharging plate 11, at the moment, the wedge 52 pushes the forming slide block 53 to move towards the right side, and the slide block spring 54 is stressed to contract; the product blank is bent into a semicircular structure through the matching of an outer semicircle formed by the third R angle groove and the fourth R angle groove and the matching of an inner semicircle at the head part of the third bending lower female die 63. And as shown in fig. 8, when the punch press runs to the limit, the semicircular bending forming of the product blank is completed at the same time. After the semi-circle bending of the product is finished, the punch drives the third bending upper die to move upwards, the third upper die discharging spring 55 pushes the third upper die discharging plate 51 away, the slider spring 54 pushes the forming slider 53 away, and the third lower discharging mechanism 64 also pushes the third bending lower female die 63 away, so that the product blank is discharged. As described above, the dies are opened and closed back and forth, completing the stamping of one product blank at a time.

It should be noted that all the directional indicators (such as up, down, left, right, front, back, 8230; \8230;) in the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

The present invention has been described above with reference to the accompanying drawings, and it is obvious that the present invention is not limited to the above embodiments, and various modifications made by the method concept and technical solution of the present invention or those directly applied to other applications without modification fall within the protection scope of the present invention.

Claims (10)

1. A precision bending semicircle application progressive die is characterized by comprising a primary bending station, a secondary bending station and a tertiary bending station which are sequentially arranged, wherein the primary bending station is provided with a primary bending device, the secondary bending station is provided with a secondary bending device, and the tertiary bending station is provided with a tertiary bending device;

the primary bending device comprises a first upper bending die and a first lower bending die, the first upper bending die comprises a first upper bending template (10) and a first upper die stripper plate (11) arranged below the first upper bending template (10); a first bending upper male die (12) is fixedly arranged in the first upper die discharging plate (11), and a first R angle is arranged at the lower left corner of the first bending upper male die (12); the first bending lower die comprises a first lower die plate (20), a first bending lower female die (21) is fixedly arranged in the first lower die plate (20), and a first R-shaped corner groove is formed in the upper right corner of the first bending lower female die (21); when the product is bent for the first time, a quarter-circle structure is bent by matching a first R angle of a first bending upper male die (12) and a first R angle groove of a first bending lower female die (21);

the secondary bending device comprises a second upper bending die and a second lower bending die, the second upper bending die comprises a second upper bending die plate (30) and a second upper die discharging plate (31) arranged below the second upper bending die plate (30); an upper sliding block male die (32) is fixedly arranged in the second bending upper die plate (30), the upper sliding block male die (32) penetrates through a second upper die discharging plate (31), and an inclined surface is arranged at the lower right corner of the upper sliding block male die (32); the second bending lower die comprises a second lower die plate (40), a second bending lower female die (41) is fixedly arranged in the second lower die plate (40), a second R corner groove is formed in the upper right corner of the second bending lower female die (41), a sliding block male die limiting block (43) is arranged on the right side of the second bending lower female die (41), a lower sliding block male die (42) is movably arranged in the sliding block male die limiting block (43), and the lower sliding block male die (42) can move towards the upper right direction or the lower left direction; the left side of the head of the lower sliding block male die (42) is provided with an inclined surface which inclines towards the lower left, and the inclined surface of the lower sliding block male die (42) is in parallel correspondence with the inclined surface of the upper sliding block male die (32); a second R angle is arranged at the lower left angle of the head part of the lower sliding block male die (42); when the product is bent for the second time, the product is bent into a one-third round structure through the matching of the inclined plane of the upper sliding block male die (32), the second R angle groove and the second R angle;

the tertiary bending device comprises a third bending upper die and a third bending lower die, the third bending upper die comprises a third bending upper die plate (50) and a third upper die stripper plate (51) arranged below the third bending upper die plate (50); a wedge (52) is fixedly arranged in the third bending upper template (50), an inclined plane is arranged at the lower right corner of the wedge (52), the wedge (52) penetrates through a third upper die discharging plate (51), a forming sliding block (53) is movably arranged in the third upper die discharging plate (51), a sliding block spring (54) is arranged on the right side of the forming sliding block (53), an inclined plane adaptive to the wedge (52) is arranged at the upper left corner of the forming sliding block (53), and a third R-corner groove is arranged at the lower right corner of the forming sliding block (53); a third bending lower male die (62) is fixedly arranged in the third bending lower die, and a fourth R-shaped corner groove is formed in the upper right corner of the third bending lower male die (62); a third bending lower female die (63) is arranged on the right side of the third bending lower male die (62), and the left side of the head of the third bending lower female die (63) is of a semicircular structure; when the product is bent for three times, the product is bent into a semicircular structure through the matching of the outer semicircle formed by the third R corner groove and the fourth R corner groove and the matching of the inner semicircle at the head part of the third bending lower female die (63).

2. The precision semi-circle folding progressive die of claim 1, wherein the first folding upper die plate (10) is provided therein with a first upper die unloading spring (14) for pushing open a first upper die unloading plate (11); the first bending upper template (10) is further provided with a first limiting hanging plate (15) used for limiting the first upper die discharging plate (11).

3. The precision semicircle folding progressive die according to claim 1, characterized in that a first unloading mechanism (22) is further provided in the first lower die plate (20), the first unloading mechanism comprises a first lower die unloading spring (223), a first lower ejector pin (222) provided on the first lower die unloading spring (223), and a unloading block (221) provided on the first lower ejector pin (222).

4. The precision folding semicircle application progressive die of claim 1, characterized in that the second folding upper die plate (30) is provided therein with a second upper die stripper spring (34) for pushing away the second upper die stripper plate (31); and a second limiting hanging plate (35) used for limiting a second upper die discharging plate (31) is further arranged on the second bending upper die plate (30).

5. The progressive die for precision semicircular folding as claimed in claim 1, wherein a pressing block (33) is further fixedly provided in the second upper die stripper plate (31), and the pressing block (33) is used for pressing down the lower sliding block male die (42).

6. The precision semicircle folding progressive die according to claim 1, wherein a second lower discharging mechanism (44) is further provided in the second lower die plate (40), the second lower discharging mechanism (44) comprises a second lower die discharging spring (442), a second lower ejector pin (441) is provided on the second lower die discharging spring (442), and the lower sliding block male die (42) is provided above the second lower ejector pin (441).

7. The precision folding semicircle application progressive die of claim 1, characterized in that the third folding upper die plate (50) is provided therein with a third upper die stripper spring (55) for pushing open the third upper die stripper plate (51); and a third limiting hanging plate (56) used for limiting a third upper die discharging plate (51) is further arranged on the third bending upper die plate (50).

8. The precision semicircle-folding progressive die according to claim 1, wherein a third lower discharging mechanism (64) is provided in the third lower bending die, the third lower discharging mechanism (64) comprises a third lower die discharging spring (642), a third lower ejector rod (641) provided on the third lower die discharging spring (642), and the third lower bending die (63) is provided above the third lower ejector rod (641).

9. The precision folding semicircle application progressive die of claim 1, wherein the precision folding semicircle application progressive die further comprises the following forming stations arranged in sequence: the device comprises a rib pressing chamfering and pilot hole punching station, a primary punching and cutting station, a secondary punching and cutting station, a tertiary punching and cutting station, a primary chamfering station, a secondary chamfering station, a trimming station, a quartic bending station and a trimming blanking station; the rib pressing chamfering and pilot hole punching station, the primary punching and cutting station, the secondary punching and cutting station, the tertiary punching and cutting station, the primary chamfering station and the secondary chamfering station are arranged in front of the primary bending station; the edge cutting station is arranged between the primary bending station and the secondary bending station, and the quartic bending station and the edge cutting blanking station are arranged behind the cubic bending station.

10. The progressive die for precision semicircular folding as claimed in claim 9, wherein a plurality of idle stations for increasing the strength of the die parts are further provided between the forming stations.

Images