CN213162701U - Progressive die for forming precise circular arc of ball valve cylinder - Google Patents

Abstract

A ball valve cylinder precise circular arc forming type progressive die comprises an ironing station, a shaping station and a circular arc forming station, wherein an ironing device is arranged on the ironing station, a shaping device is arranged on the shaping station, and a circular arc forming device is arranged on the circular arc forming station; the thinning and drawing device, the shaping device and the arc forming device are all arranged in the same ball valve cylinder precise arc forming device and are combined to form an effective forming mode. Utilize the utility model provides an among the prior art have the type of taking shape product of higher requirement to ball valve drum R angular region, need adopt many pairs of single process moulds to carry out substep processing, lead to the product location inaccurate, the size is bad, the problem that quality and cost and production efficiency are low is difficult to control.

Description

Progressive die for forming precise circular arc of ball valve cylinder

Technical Field

The utility model relates to a mould processing technology field upgrades, especially relates to a ball valve cylinder precision circular arc shaping class progressive die.

Background

The progressive die is an advanced die in the stamping production and processing at the present stage, solves many defects of a single-process die, realizes integration of multiple processes, and can carry out automatic production. The produced product has good processing quality, is stable and efficient, reduces the number of operators in the first-line production, and plays an extremely important role in the mold industry. For ball valve cylinder precision circular arc forming products, a single-process die adopts distribution operation, namely firstly cutting an outline circle of the product, then carrying out multi-pass deep drawing forming and circular arc forming, and then carrying out multi-pass single-process blanking and trimming to carry out stamping production. Due to the multiple positioning of the single punching die, the product positioning is inaccurate and the size is poor, for example, the ball valve cylinder product shown in fig. 1 and 2 has an inner circular arc and a side wall part, and most of the products are processed by adopting a single-process die at present. Therefore, the positioning precision of the product is greatly influenced, the process control difficulty is greatly increased, and the quality and the cost are difficult to control. The ball valve cylinder precision circular arc forming progressive die can be used for finishing the mass production of the products. Therefore, the invention provides the ball valve cylinder precise circular arc forming progressive die which can reduce the processing procedures, improve the processing precision, reduce the cost and improve the production efficiency.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a ball valve drum accurate circular arc type of taking shape is advanced mould in grades, solves among the prior art and has the type of taking shape product of higher requirement to ball valve drum R angular region, need adopt many pairs of single process mould to carry out substep processing, leads to the product location inaccurate, the size is bad, is difficult to control quality and problem that cost and production efficiency are low.

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

a ball valve cylinder precise circular arc forming type progressive die is characterized by comprising an ironing station, a shaping station and a circular arc forming station, wherein the ironing station is provided with an ironing device, the shaping station is provided with a shaping device, and the circular arc forming station is provided with a circular arc forming device; the thinning and drawing device, the shaping device and the arc forming device are all arranged in the same ball valve cylinder precise arc forming device;

the ironing device consists of an ironing upper male die device and an ironing lower female die device; the shaping device consists of an upper shaping male die device and a lower shaping female die device; the arc forming device consists of an arc forming upper male die device and an arc forming lower female die device;

the ball valve cylinder precise circular arc forming device comprises an upper die and a lower die, wherein the upper die comprises an upper die base plate, an upper base plate and an upper die fixing plate which are sequentially overlapped and fixed on the upper die base plate; the thinning drawing upper male die device, the shaping upper male die device and the arc forming upper male die device are all sequentially arranged in the upper die; the lower die device for thinning and drawing, the lower die device for shaping and the lower die device for arc forming are all arranged in the lower die in sequence;

the upper die device for ironing comprises a first fixing plate insert fixedly arranged in an upper die fixing plate, an ironing male die fixedly connected with the first fixing plate insert, and a first stripper plate insert fixedly arranged in a stripper plate; the thinning and drawing male die sequentially penetrates through the stripper plate back plate and the first stripper plate insert; the thinning and deep-drawing male die is matched with the inner diameter of a product;

the shaping upper punch device comprises a second fixing plate insert fixedly arranged in an upper die fixing plate, a shaping punch fixedly connected with the second fixing plate insert, and a second discharging plate insert fixedly arranged in a discharging plate; the shaping male die sequentially penetrates through the stripper plate back plate and the second stripper plate insert; the shaping male die is adapted to the inner diameter of a product and an R angle structure inside the product;

the upper convex die device for arc forming comprises a third fixing plate insert fixedly arranged in an upper die fixing plate, an arc forming convex die fixedly connected with the third fixing plate insert, and a third stripper plate insert fixedly arranged in a stripper plate; the arc forming male die sequentially penetrates through the stripper plate back plate and the third stripper plate insert; the arc forming male die is matched with the inner diameter and the inner arc structure of a product;

the lower die comprises a lower die seat plate, and a lower back plate, a lower base plate and a concave die plate which are sequentially fixed on the lower die seat plate in a superposed manner;

the lower female die device for thinning and drawing comprises a first nitrogen cylinder fixedly arranged in a lower die seat plate, a first transmission column and a first lower die inner ejector rod which are arranged on the first nitrogen cylinder, and a first female die insert fixedly arranged in a female die plate; the first lower die inner mandril penetrates through the lower base plate and the first die insert in sequence; the first die insert is matched with the outer diameter of a product;

the shaping lower female die device comprises a second nitrogen cylinder fixedly arranged in the lower die base plate, a second force transmission column and a second lower die inner ejector rod which are arranged on the second nitrogen cylinder, and a second female die insert fixedly arranged in the female die plate; the second lower die inner ejector rod sequentially penetrates through the lower base plate and the second die insert; the second die insert is matched with the outer diameter of a product; the top end of the ejector rod in the second lower die is matched with the R angle structure at the bottom of the product;

the arc forming lower female die device comprises a third nitrogen cylinder, a third force transmission column, a third lower die inner ejector rod and a third lower die inner ejector rod, wherein the third nitrogen cylinder is fixedly arranged in a lower die seat plate; the third die insert is matched with the outer diameter of a product; and the top end of the ejector rod in the third lower die is matched with the arc structure at the bottom of the product.

Furthermore, in order to facilitate discharging, the material belt is pushed out from the thinning drawing convex die, the shaping convex die and the arc forming convex die, and an upper elastic device for pushing a back plate of the discharging plate and the discharging plate away is further arranged in the upper die; the upper elastic device comprises a plug screw fixedly arranged in the upper die base plate, an inner discharging spring below the plug screw and an ejector rod.

Further, the forming device also comprises the following forming stations: the punching guide nail hole station, the primary cutting process edge station, the secondary cutting process edge station, the primary downward drawing station, the secondary downward drawing station, the tertiary downward drawing station and the quartic downward drawing station are sequentially arranged before the thinning and drawing station, the shaping station and the arc forming station; and a product producing station and a waste cutting station which are arranged after the thinning and drawing station, the shaping station and the arc forming station in sequence.

Furthermore, a plurality of idle stations for preventing the material belt from deforming and pulling are arranged between the forming stations.

The utility model has the advantages that: the utility model discloses integrating attenuation deep-drawing station, plastic station and circular arc shaping station together, utilize the single process mould to ball valve cylinder class product deep-drawing correlation technique, the precision of mould is advanced in the performance, it is multi-functional, high-effect advantage, but mass continuous production, and some shortcomings of single process mould have been solved well moreover, manufacturing procedure has been reduced, and the machining precision is improved, and the intensity of labour who alleviates personnel has played the important function to product quality's stability, effectively reduce the cost, and economic benefits is improved.

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

Drawings

Fig. 1 is a perspective view of a ball valve cylinder product structure of the present invention.

Fig. 2 is a top view of the structure of the ball valve cylinder product of the present invention.

Fig. 3 is a layout diagram of the mold design in the present invention.

Fig. 4 is a schematic structural view of the precise circular arc forming device of the middle ball valve cylinder of the present invention when it is opened.

Fig. 5 is a schematic structural view of the precision circular arc forming device for the middle ball valve cylinder of the present invention when closed.

Fig. 6 is a partial structure enlarged view of the closed precise circular arc forming device of the middle ball valve cylinder, which emphatically shows the structures of the thinning drawing device, the shaping device and the circular arc forming device.

Detailed Description

The utility model discloses a focus is on processing as shown in figure 1 and figure 2 ball valve cylinder class product, and it has lateral wall 12, circular arc 11 part, need pass through lateral wall attenuation deep-drawing, plastic and circular arc shaping process step when adding man-hour.

A ball valve cylinder precise circular arc forming type progressive die divides the whole processing into 28 stations from g1 to g 28. Wherein: g1 is a station for punching a positive nail hole, wherein the positive nail hole is used for accurately positioning a subsequent station and punching a phi 2.03 hole; g2 is an empty station, which leaves enough space for the distribution of the later process; g3, a primary process edge cutting station, and using a guide hole punched in front as accurate positioning; g4 is an empty station, which leaves enough space for the distribution of the later process; g5 is a secondary edge cutting station; g 6-g 7 are idle stations, and enough space is reserved for distribution of the subsequent working procedure; g8 is a primary downward drawing station for drawing a cylinder with an inner diameter phi of 11.2 downward; g 9-g 13 are idle stations, and are used for preventing the deformation of the material belt and the material pulling phenomenon; g14 is a secondary downward drawing station for drawing a cylinder with the inner diameter phi of 8.8 downward; g15 empty station, which leaves enough space for the distribution of the later process; g16 is a three-time downward drawing station and is used for drawing a cylinder with the inner diameter phi of 7.1 downward; g17 is an empty station, which leaves enough space for the distribution of the later process; g18 is a four-time downward drawing station for drawing a cylinder with an inner diameter phi of 5.8 downward; g19 is an empty station, which leaves enough space for the distribution of the later process; g20 is a thinning and drawing station, the side wall material of the ball valve cylinder is thinned and drawn by a thinning and drawing method and then is accumulated in an inner R corner area of the mouth part, and the wall thickness is changed from 1.0 to 0.8; g21 is an empty station, which leaves enough space for the distribution of the later process; g22 is a shaping station, and the material is further extruded to an R-angle area by using an R angle of minimum 0.2R, so that sufficient material is ensured for the subsequent arc forming; g23 is an empty station, which leaves enough space for the distribution of the later process; g24 arc forming station, forming the arc surface by using the forming convex-concave die; g25 is an empty station, which leaves enough space for the distribution of the later process; g26 is a product discharging station, the product is directly pulled downwards to be washed from the female die, and the product falls out from the lower part of the die holder and is conveyed to the part box by a conveyer belt; g27 is an empty station, which leaves enough space for the distribution of the later process; g28 is a scrap cutting station for cutting scrap from a strip of material. The continuous stamping and forming of the whole ball valve cylinder precision circular arc forming product is completed through the 28 stations. The utility model discloses the accurate circular arc forming device of ball valve drum of key description sets up respectively and is the ironing station for g20, g22 for plastic station and g24 circular arc forming station, and all the other settings are for the empty station of technology that the shaping product set up, or conventional station etc. do not explain in detail one by one here.

The thinning and drawing device of the thinning and drawing station, the shaping device of the shaping station and the arc shaping device of the arc shaping station are integrated together and arranged in the same ball valve cylinder precise arc shaping device;

the ironing device consists of an upper ironing die device 31 and a lower ironing die device 41; the shaping device consists of an upper shaping male die device 32 and a lower shaping female die device 42; the arc forming device consists of an arc forming upper male die device 33 and an arc forming lower female die device 43;

the ball valve cylinder precise arc forming device comprises an upper die 30 and a lower die 40, wherein the upper die 30 comprises an upper die base plate 301, an upper base plate 302 and an upper die fixing plate 303 which are sequentially overlapped and fixed on the upper die base plate 301; the upper punch device 31 for thinning and drawing, the shaping upper punch device 32 and the arc forming upper punch device 33 are all sequentially arranged in the upper die 30; the lower die device 41 for thinning and drawing, the lower shaping die device 42 and the lower die device 43 for arc forming are all arranged in the lower die 40 in sequence;

the upper punch die device 31 for ironing comprises a first fixed plate insert 311 fixedly arranged in an upper die fixed plate 303, an ironing male die 312 fixedly connected with the first fixed plate insert 311, and a first stripper plate insert 313 fixedly arranged in a stripper plate 305; the thinning and drawing male die 312 sequentially penetrates through the stripper back plate 304 and the first stripper insert 313; the thinning and deep drawing male die 312 is matched with the inner diameter of a ball valve cylinder product;

the shaping male die device 32 comprises a second retainer insert 321 fixedly arranged in the upper die retainer 303, a shaping male die 322 fixedly connected with the second retainer insert 321, and a second discharge plate insert 323 fixedly arranged in the discharge plate 305; the shaping male die 322 sequentially penetrates through the stripper plate back plate 304 and the second stripper plate insert 323; the shaping male die 322 is matched with the inner diameter of a ball valve cylindrical product and an R angle structure in the product;

the upper convex die device 33 for arc forming comprises a third fixing plate insert 331 fixedly arranged in the upper die fixing plate 303, an arc forming convex die 332 fixedly connected with the third fixing plate insert 331, and a third stripper plate insert 333 fixedly arranged in the stripper plate 305; the arc forming male die 332 sequentially penetrates through the stripper plate back plate 304 and the third stripper plate insert 333; the arc forming male die 332 is matched with the inner diameter and the inner arc structure of a ball valve cylindrical product;

the lower die 40 comprises a lower die base plate 404, and a lower back plate 403, a lower backing plate 402 and a concave die plate 401 which are sequentially fixed on the lower die base plate 404 in an overlapping manner;

the ironing lower die device 41 comprises a first nitrogen cylinder 414 fixedly arranged in the lower die base plate 404, a first force transmission column 413 and a first lower die inner ejector rod 412 which are arranged on the first nitrogen cylinder 414, and a first die insert 411 fixedly arranged in the die plate 401; the first lower die inner mandril 412 sequentially passes through the lower base plate 402 and the first die insert 411; the first die insert 411 is adapted to the outer diameter of the cylindrical ball valve piece;

the shaping lower die device 42 comprises a second nitrogen cylinder 424 fixedly arranged in the lower die base plate 404, a second force transmission column 423 and a second lower die inner ejector rod 422 which are arranged on the second nitrogen cylinder 424, and a second die insert 421 fixedly arranged in the die plate 401; the second lower die inner mandril 422 sequentially passes through the lower backing plate 402 and the second die insert 421; the second die insert 421 is adapted to the outer diameter of the ball valve cylinder product; the top end of the second lower die inner ejector rod 422 is matched with an R angle structure at the bottom of a ball valve cylindrical product;

the lower concave die device 43 for arc forming comprises a third nitrogen cylinder 434 fixedly arranged in the lower die base plate 404, a third force transmission column 433 and a third lower die inner top rod 432 which are arranged on the third nitrogen cylinder 434, and a third die insert 431 fixedly arranged in the concave die plate 401, wherein the third nitrogen cylinder 434 is fixedly arranged in the lower die base plate 404, and the third lower die inner top rod 432 sequentially penetrates through the lower base plate 402 and the third die insert 431; the third die insert 431 is matched with the outer diameter of a ball valve cylindrical product; the top end of the third lower die inner ejector rod 432 is matched with the arc structure at the bottom of the ball valve cylinder product.

In order to facilitate discharging, the material belt is pushed out from the thinning drawing male die, the shaping male die and the arc forming male die, and an upper elastic device 50 for pushing a back plate 304 and a discharging plate 305 of the discharging plate is further arranged in the upper die 30; the upper elastic device 50 comprises a plug screw 501 fixedly arranged in the upper die base plate 301, an inner discharging spring 502 and a top rod 503 below the plug screw 501.

The utility model discloses a ball valve drum accurate circular arc class progressive die that takes shape still includes following shaping station: the punching guide nail hole station, the primary cutting process edge station, the secondary cutting process edge station, the primary downward drawing station, the secondary downward drawing station, the tertiary downward drawing station and the quartic downward drawing station are sequentially arranged before the thinning and drawing station, the shaping station and the arc forming station; and a product producing station and a waste cutting station which are arranged after the thinning and drawing station, the shaping station and the arc forming station in sequence. And a plurality of idle stations for preventing the material belt from deforming and pulling are arranged between the forming stations.

During production, in the process of closing the die, the ironing male die 312 fixed on the upper fixed plate 303 firstly enters the first die insert 411, then the ejector rod 503 of the upper elastic structure 50 of the upper die 30 pushes against the upper surface of the stripper plate back plate 304 to continuously move downwards, the material strip is pressed to contact the female die plate 401, the product is pressed into the ironing lower female die device 41 through the ironing upper male die device 31, the thinning work of the side wall of the product is completed, meanwhile, the redundant material is stacked into the corner R of the product, and at this time, as shown in fig. 5 and 6, the die is completely closed. After the die is opened, the stripper plate 305 of the upper die 30 is separated along with the upper die and the lower die, and simultaneously, the elastic force of the inner stripper spring 502 in the upper die 30 separates the stripper plate back plate 304 from the upper die fixing plate 303 to push the material strip out of the ironing male die; the first lower die lift pin 412 is in the ironing lower die device 41, and its elastic force acts on the material belt to push the product out of the ironing lower die device 41, and at this time, as shown in fig. 4, the die is fully opened.

Meanwhile, in the process of closing the mold, the shaping male mold 321 fixed on the upper fixed plate 303 firstly enters the second die insert 421, then the ejector rod 503 of the upper elastic structure 50 of the upper mold 30 pushes against the upper surface of the stripper plate back plate 304 to move downwards continuously, the material belt is pressed to contact with the female mold plate 401, the product is pressed into the shaping lower female mold 42 through the shaping upper male mold device 32, the shaping work of the R angle of the product is completed, the material is further extruded to the R angle area of the product through the small R angle of 0.2R, and at this time, as shown in fig. 5 and fig. 6, the mold is completely closed. After the mold is opened, the stripper plate 305 of the upper mold 30 is separated along with the upper mold and the lower mold, and simultaneously, the elastic force of the inner stripper spring 502 in the upper mold 30 separates the stripper plate back plate 304 from the upper mold fixing plate 303 to push the material belt out of the shaping male mold 321; and the second lower mold inner ejector rod 422 is arranged in the shaping lower concave mold device 42, the elastic force of the second lower mold inner ejector rod 422 acts on the material belt to push the product out of the shaping lower concave mold device 42, and at the moment, the mold is completely opened as shown in fig. 4.

Meanwhile, in the process of closing the die, the arc forming punch 331 fixed on the upper fixed plate 303 firstly enters the third die insert 431, then the ejector rod 503 of the upper elastic structure 50 of the upper die pushes against the upper surface of the stripper plate back plate 304 to continuously move downwards, the material strip is pressed to contact the cavity plate 401, the product is pressed into the arc forming lower die 43 device through the arc forming upper punch device 33, and enough material is completely stacked in the R-angle area of the product due to the previous thinning and drawing station and shaping station processing, so that the quality and the precision of arc forming can be effectively ensured, and at the moment, as shown in fig. 5 and 6, the die is completely closed. After the mold is opened, the stripper plate 305 of the upper mold 30 is separated along with the upper mold and the lower mold, and simultaneously, the elastic force of the inner stripper spring 502 in the upper mold 30 separates the stripper plate back plate 304 from the upper mold fixing plate 303 to push the material belt out of the shaping male mold; and the third lower in-mold ejector rod 432 is in the arc forming lower female die device 43, the elastic force of the third lower in-mold ejector rod 432 acts on the material belt to push the product out of the arc forming lower female die device 43, and at this time, as shown in fig. 4, the mold is completely opened.

By the mode, the continuous stamping and forming of the whole ball valve cylinder precision circular arc forming product can be completed by the feeding machine in the feeding process.

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 (4)

1. A ball valve cylinder precise circular arc forming type progressive die is characterized by comprising an ironing station, a shaping station and a circular arc forming station, wherein the ironing station is provided with an ironing device, the shaping station is provided with a shaping device, and the circular arc forming station is provided with a circular arc forming device; the thinning and drawing device, the shaping device and the arc forming device are all arranged in the same ball valve cylinder precise arc forming device;

the ironing device consists of an ironing upper male die device (31) and an ironing lower female die device (41); the shaping device consists of an upper shaping male die device (32) and a lower shaping female die device (42); the arc forming device consists of an arc forming upper male die device (33) and an arc forming lower female die device (43);

the ball valve cylinder precise circular arc forming device comprises an upper die (30) and a lower die (40), wherein the upper die (30) comprises an upper die base plate (301), and an upper base plate (302) and an upper die fixing plate (303) which are sequentially overlapped and fixed on the upper die base plate (301); the upper punch device (31) for thinning and drawing, the shaping upper punch device (32) and the arc forming upper punch device (33) are all sequentially arranged in the upper die (30); the lower female die device (41) for thinning and drawing, the lower female die device (42) for shaping and the lower female die device (43) for arc forming are all arranged in the lower die (40) in sequence;

the upper punch device (31) for ironing comprises a first fixing plate insert (311) fixedly arranged in an upper die fixing plate (303), an ironing punch (312) fixedly connected with the first fixing plate insert (311), and a first stripper plate insert (313) fixedly arranged in a stripper plate (305); the thinning and drawing male die (312) sequentially penetrates through the stripper plate back plate (304) and the first stripper plate insert (313); the thinning and deep-drawing male die (312) is matched with the inner diameter of a product;

the shaping upper male die device (32) comprises a second fixed plate insert (321) fixedly arranged in the upper die fixed plate (303), a shaping male die (322) fixedly connected with the second fixed plate insert (321), and a second discharging plate insert (323) fixedly arranged in the discharging plate (305); the shaping male die (322) sequentially penetrates through the stripper plate back plate (304) and the second stripper plate insert (323); the shaping male die (322) is matched with the inner diameter of a product and the R-shaped structure in the product;

the upper convex die device (33) for arc forming comprises a third fixing plate insert (331) fixedly arranged in an upper die fixing plate (303), an arc forming convex die (332) fixedly connected with the third fixing plate insert (331), and a third stripper plate insert (333) fixedly arranged in a stripper plate (305); the arc forming male die (332) sequentially penetrates through the stripper plate back plate (304) and the third stripper plate insert (333); the arc forming male die (332) is matched with the inner diameter and the inner arc structure of a product;

the lower die (40) comprises a lower die base plate (404), and a lower back plate (403), a lower cushion plate (402) and a concave die plate (401) which are sequentially overlapped and fixed on the lower die base plate (404);

the lower female die device (41) for thinning and drawing comprises a first nitrogen cylinder (414) fixedly arranged in a lower die seat plate (404), a first transmission column (413) and a first lower die inner ejector rod (412) which are arranged on the first nitrogen cylinder (414), and a first female die insert (411) fixedly arranged in a female die plate (401); the first lower die inner mandril (412) sequentially penetrates through the lower base plate (402) and the first die insert (411); the first die insert (411) is matched with the outer diameter of a product;

the shaping lower die device (42) comprises a second nitrogen cylinder (424) fixedly arranged in the lower die base plate (404), a second force transmission column (423) and a second lower die inner ejector rod (422) which are arranged on the second nitrogen cylinder (424), and a second die insert (421) fixedly arranged in the die plate (401); the second lower die inner mandril (422) sequentially penetrates through the lower backing plate (402) and the second die insert (421); the second die insert (421) is adapted to the outer diameter of the product; the top end of the second lower die inner ejector rod (422) is matched with an R angle structure at the bottom of the product;

the lower concave die device (43) for arc forming comprises a third nitrogen cylinder (434) fixedly arranged in a lower die base plate (404), a third force transmission column (433) and a third lower die inner ejector rod (432) which are arranged on the third nitrogen cylinder (434), and a third die insert (431) fixedly arranged in a concave die plate (401), wherein the third nitrogen cylinder (434) is fixedly arranged in the lower die base plate (404), and the third lower die inner ejector rod (432) sequentially penetrates through a lower base plate (402) and the third die insert (431); the third die insert (431) is matched with the outer diameter of a product; the top end of the third lower die inner ejector rod (432) is matched with the arc structure at the bottom of the product.

2. A progressive die of the ball valve cylinder precision circular arc forming type according to claim 1, characterized in that said upper die (30) further comprises upper elastic means (50) for pushing away a stripper back plate (304) and a stripper plate (305); the upper elastic device (50) comprises a plug screw (501) fixedly arranged in the upper die base plate (301), an inner discharging spring (502) and an ejector rod (503) below the plug screw (501).

3. The precision circular arc forming progressive die for a ball valve cylinder as claimed in claim 1, further comprising the following forming stations: the punching guide nail hole station, the primary cutting process edge station, the secondary cutting process edge station, the primary downward drawing station, the secondary downward drawing station, the tertiary downward drawing station and the quartic downward drawing station are sequentially arranged before the thinning and drawing station, the shaping station and the arc forming station; and a product producing station and a waste cutting station which are arranged after the thinning and drawing station, the shaping station and the arc forming station in sequence.

4. The precision circular arc forming progressive die of a ball valve cylinder as claimed in claim 3, wherein a plurality of idle stations for preventing the deformation and the material tearing of the material belt are arranged between the forming stations.

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