CN116900170B - Side stacking workpiece stamping device and method thereof - Google Patents
Side stacking workpiece stamping device and method thereof Download PDFInfo
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- CN116900170B CN116900170B CN202311177249.5A CN202311177249A CN116900170B CN 116900170 B CN116900170 B CN 116900170B CN 202311177249 A CN202311177249 A CN 202311177249A CN 116900170 B CN116900170 B CN 116900170B
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000007493 shaping process Methods 0.000 claims abstract description 53
- 239000000463 material Substances 0.000 claims description 41
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 19
- 239000002994 raw material Substances 0.000 claims description 19
- 238000004080 punching Methods 0.000 claims description 11
- 230000003746 surface roughness Effects 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 11
- 238000003672 processing method Methods 0.000 description 3
- 238000003754 machining Methods 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
Abstract
The invention discloses a stamping device and a stamping method for a side surface material-overlapping workpiece, wherein the workpiece is of a cup-shaped structure, the outer wall of the middle part of the workpiece is provided with an annular material-overlapping structure protruding outwards, the thickness of the inner wall of the workpiece is 2.5+/-0.01 mm, the roughness of the inner wall of the workpiece is less than Ra0.03, the height of the material-overlapping structure protruding out of the outer wall of the workpiece is greater than 15mm, and the following stations are arranged on a lower die holder of the stamping device at equal intervals: a blanking station; a pre-stretching station; a stretching station; a side forming station; a side stacking station; shaping stations; and (5) a roughness finishing station. The beneficial effects of the invention are as follows: 1) Realizing a stamping process of side stacking; 2) The vertical positions of the punch and the lower die are fixed to improve concentricity, and then the process requirement meeting roughness can be met by stamping, so that the processing technology is reduced, and the production efficiency is improved. 3) The side forming punch consists of a plurality of sub punches which are circumferentially distributed, so that the step of placing the side forming punch is reduced, and the production efficiency is improved.
Description
Technical Field
The invention relates to the field of machinery, in particular to a side stacking workpiece stamping device and a side stacking workpiece stamping method.
Background
Materials such as aluminum and stainless steel are suitable for manufacturing various stamping parts, especially various lightweight parts used in new energy vehicles, because of their good ductility. The bearing type part has an annular stacking material protruding outwards from the outer wall of the middle part, and the design requirement is that the wall thickness is smaller than 2.5+/-0.01 mm, the roughness of the inner wall is smaller than Ra0.03, and the height of the stacking material protruding out of the outer wall of a workpiece is larger than 15mm. For this type of part machining, it is difficult for the conventional stamping structure to form side stacks, and the stamped roughness is difficult to meet the requirements, requiring post machining to improve the roughness. This not only increases the processing procedure, but also increases the turnover procedure, greatly reducing the efficiency.
Disclosure of Invention
The invention aims to provide a side stacking workpiece stamping device and a side stacking workpiece stamping method, wherein the side stacking workpiece stamping device is high in production efficiency and meets the production process requirements.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the utility model provides a side fold material work piece stamping device, the work piece is cup type structure, the outer wall of middle part has the annular fold material of outwards protrusion, its wall thickness is 2.5 ± 0.01mm, the roughness of its inner wall is less than Ra0.03, fold the material protrusion in the height of work piece outer wall is greater than 15mm, stamping device includes upper die base and die holder, equidistant following station that is provided with on the die holder:
1) The blanking station is used for punching a round raw material from the metal plate, and the thickness of the raw material is more than 3.0mm and less than 3.2mm;
2) The pre-stretching station is used for stamping the raw materials to form a cup-shaped primary blank I, wherein the height of the primary blank I is less than or equal to 2/3 of the total design length of the workpiece;
3) The drawing station is used for carrying out punching drawing on the primary blank I to the designed total length to obtain a primary blank II, wherein the wall thickness of the primary blank II is more than 2.55mm and less than 2.6mm;
4) The side forming station is used for extruding the inner wall of the primary blank II at the material stacking position from inside to outside to obtain a primary blank III with a protruding part protruding outwards; the line length of the protruding part is equal to that of the stacked material;
5) A side stacking station is used for extruding the protruding part of the primary blank III upwards to form the stacking, so as to obtain a primary blank IV;
6) A shaping station for shaping the primary blank IV to obtain a primary blank V with the inner diameter smaller than the designed inner diameter by 0.1mm, the outer diameter smaller than the designed outer diameter by 0.07mm and the wall thickness of 2.65 mm;
7) A roughness finishing station for finishing the primary blank five to obtain a product with the inner wall roughness smaller than Ra0.03 and the wall thickness of 2.5+/-0.01 mm;
transferring the workpiece between the stations through a transfer clamp; each station comprises a lower female die fixedly arranged on the lower die holder and a punch corresponding to the lower female die and arranged on the upper die holder; the lower female dies of the shaping station and the roughness finishing station comprise a cylindrical cavity; concentricity of the lower female die and the punch of the shaping station and the roughness finishing station is less than or equal to 0.005mm, and tolerance of the inner diameter of the lower female die and the outer diameter of the punch of the shaping station and the roughness finishing station is +/-0.005 mm;
the inner diameter of the lower female die of the side forming station is 0.8mm larger than the outer diameter of the workpiece, and the lower female dies of the side stacking station, the shaping station and the roughness finishing station all comprise grooves for accommodating stacked materials.
Preferably, the surfaces of the punch and the lower die of the roughness finishing station are plated with a titanium alloy layer, the thickness of the titanium alloy layer is smaller than 2 mu m, and the surface roughness of the titanium alloy layer is smaller than or equal to Ra0.01.
Preferably, a side forming punch is sleeved on the punch of the side forming station, the side forming punch consists of a plurality of sub punches which are circumferentially arranged, and the side forming punch comprises a central hole for the punch to pass through; the lower parts of the inner sides of the sub-punches are respectively provided with a wedge-shaped guide surface towards the inner side, and the punches of the side forming stations comprise a conical part matched with the wedge-shaped guide surfaces.
Preferably, the sub-punch comprises a tail portion and a head portion made of hard material, the tail portion and the head portion being connected by an intermediate portion made of flexible material, the wedge-shaped guide surface being provided at the head portion.
Preferably, the punch of the side forming station comprises a limiting block positioned at the front part of the conical part, and all the sub-punches are connected through a plurality of elastic ropes so that the sub-punches are wrapped on the punch of the side forming station.
Preferably, two side forming sliding blocks are horizontally movably arranged on the lower die holders of the side forming station, the shaping station, the side stacking station, the shaping station and the roughness finishing station, guide inclined planes are arranged on the outer sides of the side forming sliding blocks, and two slotting tools for driving the side forming sliding blocks to horizontally move are arranged on the upper die holders of the side forming station, the shaping station, the side stacking station, the shaping station and the roughness finishing station and correspond to the guide inclined planes.
Preferably, the transfer fixture comprises a horizontal rail and a reciprocating cylinder, wherein the horizontal rail is arranged on the lower die holder, two sliding blocks are movably arranged on the horizontal rail, the reciprocating cylinder drives the sliding blocks to reciprocate along the horizontal rail, two clamping jaws are horizontally arranged on the sliding blocks, and the two clamping jaw cylinders drive the two clamping jaws to oppositely or oppositely move.
The invention also provides a side stacking workpiece stamping processing method, which comprises the side stacking workpiece stamping device, wherein the workpiece is of a cup-shaped structure, the outer wall of the middle part of the workpiece is provided with an annular stacking material protruding outwards, the wall thickness of the stacking material is smaller than 2.5+/-0.01 mm, the roughness of the inner wall of the stacking material is smaller than Ra0.03, and the height of the stacking material protruding out of the outer wall of the workpiece is larger than 15mm, and the side stacking workpiece stamping processing method comprises the following steps:
s1, blanking: die-cutting a round raw material from a metal plate;
s2, prestretching: prestretching the raw materials by a punch head to form a cup-shaped structure, wherein the total length of the cup-shaped structure is less than or equal to 2/3 of the designed total length of the workpiece;
s3, stretching: stretching the primary blank I obtained in the step S2 through a punch head to ensure that the total length of the primary blank I is equal to the total length of a workpiece;
s4, side forming: side punching is carried out on the primary blank II obtained in the step S3 through a side forming punch, so that the middle part of the primary blank II protrudes outwards in an annular mode to form a protruding part, and the line length of the protruding part is equal to that of the stacked material;
s5, side stacking: extruding the primary blank III obtained in the step S4 from bottom to top through a punch and a lower die of a side stacking station, so that a convex part of the primary blank III flows upwards to form the stacking;
s6, shaping: shaping the primary blank IV obtained in the step S5 through a punch and a lower die of a shaping station, so that the appearance is consistent with the product;
s7, fine shaping, namely fine shaping the primary blank five obtained in the S6 through a punch and a lower die of a roughness finishing station to obtain a product with inner wall roughness less than Ra0.03;
s8, discharging and taking out the product.
Preferably, the outer diameter of the punch of the shaping station is 0.1mm smaller than that of the punch of the roughness finishing station, the inner diameter of the lower female die of the shaping station is 0.07mm smaller than that of the lower female die of the finishing station, and the tolerance of the design parameters of the punch of the roughness finishing station and the lower female die and the product is +/-0.005 mm.
Preferably, the surfaces of the punch and the lower die of the roughness finishing station are plated with a titanium alloy layer, the thickness of the titanium alloy layer is smaller than 2 mu m, and the surface roughness of the titanium alloy layer is smaller than or equal to Ra0.01.
The beneficial effects of the invention are as follows:
1) Realizing a stamping process of side stacking;
2) The vertical positions of the punch and the lower die are fixed to improve concentricity, and then the process requirement meeting roughness can be met by stamping, so that the processing technology is reduced, and the production efficiency is improved.
3) The side forming punch consists of a plurality of sub punches which are circumferentially distributed, so that the step of placing the side forming punch is reduced, and the production efficiency is improved.
Drawings
FIG. 1 is a schematic view of a part of the structure of the present invention in a top view;
FIG. 2 is a schematic view of a part of the structure of the present invention in elevation;
FIG. 3 is a schematic view of the structure of the transfer jig;
FIG. 4 is a schematic representation of a variation of the work piece at each station;
FIG. 5 is a schematic view of the structure of the pretensioning station
FIG. 6 is a schematic structural view of a shaping station;
FIG. 7 is a schematic view of a partial construction of a side forming station;
fig. 8 is a schematic perspective view of a sub-punch.
Detailed Description
The technical scheme of the invention is further described in detail below with reference to the specific embodiments.
In the description of the present invention, it should be noted that the positional or positional relationship indicated by the terms such as "inner", "outer", "upper", "lower", "horizontal", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
As shown in fig. 1 to 8, in the side stacking workpiece stamping device, a workpiece 10 is of a cup-shaped structure, an outer wall of the middle part of the workpiece 10 is provided with an annular stacking material protruding outwards, the wall thickness of the stacking material is 2.5+/-0.01 mm, the roughness of the inner wall of the stacking material is less than Ra0.03, and the height of the stacking material protruding out of the outer wall of the workpiece 10 is greater than 15mm. Of course, the present invention should not be limited to processing the workpiece 10 with the above design requirements, and the workpiece 10 of the same type, even if other parameters are different, can be properly adjusted by referring to the implementation manner of the present invention, so as to complete the processing.
The stamping device comprises a machine base 14, wherein the machine base 14 is provided with the following stations at equal intervals:
1) A blanking station 20 for punching a circular raw material from a metal plate, wherein the thickness of the raw material is more than 3.0mm and less than 3.2mm;
2) A prestretching station 22 for punching the raw material to form a cup-shaped primary blank 1, the height of the primary blank being less than or equal to 2/3 of the design total length of the workpiece 10;
3) Drawing station 24, namely punching and drawing the primary blank I to the designed total length to obtain a primary blank II, wherein the wall thickness of the primary blank II is more than 2.55mm and less than 2.6mm;
4) A side forming station 26 for extruding the inner wall of the blank II at the stacking position from inside to outside to obtain a blank III with a convex part protruding outwards; wherein the line length of the protruding part is equal to the line length of the stacked material;
5) A side stacking station 28 for extruding the protruding part of the primary blank III upwards to form a stacked material, so as to obtain a primary blank IV;
6) A shaping station 30 for shaping the primary blank IV to obtain a primary blank V with an inner diameter smaller than the designed inner diameter by 0.1mm, an outer diameter smaller than the designed outer diameter by 0.07mm and a wall thickness of 2.65 mm;
7) And a roughness finishing station 32 for finishing the primary blank five to obtain a finished product with the inner wall roughness less than Ra0.03 and the wall thickness of 2.5+/-0.01 mm.
Wherein each station is provided with an upper die holder 16 and a lower die holder 18, and the adjacent stations are used for transferring the workpiece 10 through a transfer clamp 34; the transfer fixture 34 in this embodiment includes a horizontal rail 36 disposed on the lower die holder 18, and a reciprocating cylinder 38, wherein two sliding blocks 40 are movably disposed on the horizontal rail 36, the reciprocating cylinder 38 drives the sliding blocks 40 to reciprocate along the horizontal rail 36, two clamping jaws 42 are horizontally disposed on the sliding blocks 40, and two clamping jaw cylinders 44 drive the two clamping jaws 42 to move relatively or oppositely. Of course, a multi-axis robot may be used instead of the transfer jig 34.
Each station comprises a lower die 46 fixedly arranged on a lower die holder 18 through a die fixing seat 45, an upper backing plate 72, an upper clamping plate 74 and a punch 48 which correspond to the lower die 46 and are arranged on an upper die holder 16; the lower die 46 of the shaping station 30 and the roughness finishing station 32 each include a cylindrical cavity; the positions of the lower die 46 and the punch 48 of the shaping station 30 and the roughness finishing station 32 are fixed, and thus their positions can be precisely set so that their concentricity is 0.005mm or less and the tolerances of the inner diameter of the lower die 46 and the outer diameter of the punch 48 are + -0.005 mm.
The inner diameter of the lower die 46 of the side forming station 26 is 0.8mm greater than the outer diameter of the workpiece 10 and the lower die 46 of the side lay-up station 28, the shaping station 30 and the roughness finishing station 32 each include a recess to receive the lay-up.
The surface of the punch 48 and the lower die 46 of the roughness finishing station 32 are plated with a titanium alloy layer, the thickness of the titanium alloy layer is less than 2 mu m, and the surface roughness of the titanium alloy layer is less than or equal to Ra0.01.
Further, the punch 48 of the side forming station 26 is sleeved with a side forming punch, the side forming punch is composed of a plurality of sub-punches 52 which are circumferentially arranged, and the side forming punch comprises a central hole for the punch 48 of the side forming station 26 to pass through; the lower inner portions of the sub-punches 52 are each provided inwardly with a wedge-shaped guide surface 54 and the punches 48 of the side forming stations 26 include a tapered portion 56 which is in shape mating with the wedge-shaped guide surface 54.
The sub-punch 52 includes a tail portion 58 and a head portion 60 made of a hard material, the tail portion 58 and the head portion 60 being connected by an intermediate portion 62 made of a flexible material, the wedge-shaped guide surface 54 being provided on the head portion 60. The flexible material may be an elastic sheet.
The punch 48 of the side forming station 26 includes a stop 66 at the front of the tapered portion 56, the stop 66 preventing the sub-punches 52 from falling out when the punch 48 of the side forming station 26 is moved upwardly. All the sub-punches 52 are connected by a plurality of elastic cords 64 so that the sub-punches 52 are wrapped around the punches 48 of the side forming station, typically by connecting two elastic cords 64 in series with a tail portion 58 and a head portion 60, respectively, with corresponding slots (not shown) provided in the tail portion 58 and the head portion 60. Conventional side forming punches require additional mechanisms to place them into the workpiece and then stamp them, which require additional structure, increasing the complexity of the equipment and also resulting in difficulty in simultaneous removal and placement, thus causing failure and rejection. After the invention is improved, the invention can be up and down along with the punch 48, and no additional structure and process are needed, thereby reducing the cost and improving the efficiency.
Two side forming slide blocks 40 are horizontally movably arranged on the lower die holder 18 of the side forming station 26, the shaping station 30, the side stacking station 28, the shaping station 30 and the roughness finishing station 32, guide inclined planes 76 are arranged on the outer sides of the side forming slide blocks 40, and two slotting tools 78 for driving the side forming slide blocks 40 to horizontally move are arranged on the upper die holder 16 of the side forming station 26, the shaping station 30, the side stacking station 28, the shaping station 30 and the roughness finishing station 32 at positions corresponding to the guide inclined planes. The slotting tool 78 descends to contact the guide ramp 76, thereby driving the side forming slide 40 inwardly, thereby laterally spacing the workpiece 10.
The invention also provides a side surface stacked workpiece stamping processing method, which comprises a side surface stacked workpiece stamping device, comprising the following steps:
s1, blanking: in the blanking station 20, round raw materials are punched (or die-cut) from a metal plate by using a punch 48 and a lower die 46 thereof, the diameter of the raw materials should ensure that the materials required for stretching the whole workpiece 10 are all stretched, that is, the total weight of the raw materials is greater than the design weight of the workpiece 10, and the thickness of the raw materials should be 0.05mm greater than the thickness of the design workpiece 10, and neither too thick nor too thin is beneficial for punching;
s2, prestretching: prestretching the raw material by a punch 48 to form a cup-shaped structure, wherein the total length of the prestretching raw material is less than or equal to 2/3 of the design total length of the workpiece 10;
s3, stretching: drawing the primary blank obtained in the step S2 by a punch 48, wherein the total length of the primary blank is equal to that of the workpiece 10, namely, drawing in the two steps S2 and S3, so as to obtain a cup-shaped semi-finished product, wherein the cup height is consistent with the design height; the situation of material fracture caused by overstretching can be avoided by two-step stretching; this may also be adjusted depending on the height of the workpiece 10, for example by stretching only once or more.
S4, side forming: side punching is carried out on the primary blank II obtained in the step S3 through a side forming punch, so that the middle part of the primary blank II protrudes outwards in an annular mode to form a protruding part, and the line length of the protruding part is equal to that of the stacked material; the length of the projections and the stacks refers to the length over which they are spread out in a straight line.
S5, side stacking: extruding the primary blank III obtained in the step S4 from bottom to top through a punch 48 and a lower die 46 of the side stacking station 28, so that a convex part of the primary blank III flows upwards to form a stacked material;
s6, shaping: shaping the primary blank IV obtained in the step S5 through a punch 48 and a lower female die 46 of the shaping station 30, so that the appearance is consistent with the product;
s7, fine shaping, namely fine shaping the primary blank five obtained in the S6 through a punch 48 and a lower female die 46 of the fine shaping station 30 to obtain a product with inner wall roughness less than Ra0.03;
s8, blanking, taking out the product through the transfer clamp 34, and putting the product into the inclined slide way 70, thereby finishing processing.
In S4, a side forming punch is horizontally movably disposed in the lower die 46 of the side forming station 26, and the side forming punch is composed of a plurality of circumferentially arranged sub-punches 52, and the side forming punch includes an axially disposed central hole; the side forming punch is arranged in the primary blank II; the lower inner portions of the sub-punches 52 are each provided inwardly with a wedge-shaped guide surface 54 and the punches 48 of the side forming stations 26 include a tapered portion 56 which is in shape mating with the wedge-shaped guide surface 54. The sub-punch 52 includes a tail portion 58 and a head portion 60 made of a hard material, the tail portion 58 and the head portion 60 being connected by an intermediate portion 62 made of a flexible material, the wedge-shaped guide surface 54 being provided on the head portion 60. The punches 48 of the side forming station 26 include a stop 66 at the front of the tapered portion 56, with all of the sub-punches 52 connected by a plurality of elastic cords 64. The working principle is as follows: the punches 48 of the side forming station 26 are secured with 4 or 6 sub-punches 52 by means of elastic cords 64, the sub-punches 52 having a turned-out fold, all of the sub-punches 52 forming a side forming punch of annular configuration and being attached to the punches 48 of the side forming station 26. The side forming punch is limited by the stopper 66 so as not to fall off from the bottom. When the punch 48 of the side forming station 26 is pressed downwardly, the side forming punch enters the blank two, then its fold is blocked by the blank two and cannot continue to move downwardly, at which point the punch 48 of the side forming station 26 continues downwardly until its tapered portion 56 contacts the wedge-shaped guide surface 54, thereby driving the head 60 of the sub-punch 52 to expand outwardly, thereby expanding the blank outwardly to form a projection. Upon exit, the punches 48 of the side forming station 26 are moved first, the sub-punches 52 are retracted, and then exit with the punches 48 of the side forming station 26. This structure allows the sub-punches 52 to be attached to the punches 48, avoiding the need for a separate side forming punch structure, thereby simplifying the structure and saving costs.
Wherein the punch 48 of the shaping station 30 is 0.1mm smaller than the outer diameter of the punch 48 of the finishing station 30, the lower die 46 of the shaping station 30 is 0.07mm smaller than the inner diameter of the lower die 46 of the finishing station 30, and the tolerance of the punch 48 and the lower die 46 of the finishing station 30 to the design parameters of the product is + -0.005 mm. The structure can reserve enough materials, so that the filling mould is conveniently extruded when the finishing station 30 performs the roughness fine finishing, and the requirements of the finishing and the roughness are met.
The surfaces of the punch 48 and the lower die 46 of the finishing station 30 are plated with a titanium alloy layer, the thickness of the titanium alloy layer is less than 2 mu m, and the surface roughness of the titanium alloy layer is less than or equal to Ra0.01. The titanium alloy layer has higher hardness, and can ensure that higher surface roughness and shape accuracy can be maintained after batch stamping.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present invention.
Claims (10)
1. The utility model provides a material work piece stamping device is folded to side, the work piece is cup-shaped structure, the outer wall of middle part has outwards convex annular fold material, its wall thickness is 2.5 ± 0.01mm, the roughness of its inner wall is less than Ra0.03, fold the material protrusion in the height of work piece outer wall is greater than 15mm, stamping device includes frame, its characterized in that: the machine base is provided with the following stations at equal intervals:
1) The blanking station is used for punching a round raw material from the metal plate, and the thickness of the raw material is more than 3.0mm and less than 3.2mm;
2) The pre-stretching station is used for stamping the raw materials to form a cup-shaped primary blank I, wherein the height of the primary blank I is less than or equal to 2/3 of the total design length of the workpiece;
3) The drawing station is used for carrying out punching drawing on the primary blank I to the designed total length to obtain a primary blank II, wherein the wall thickness of the primary blank II is more than 2.55mm and less than 2.6mm;
4) The side forming station is used for extruding the inner wall of the primary blank II at the material stacking position from inside to outside to obtain a primary blank III with a protruding part protruding outwards; the line length of the protruding part is equal to that of the stacked material;
5) A side stacking station is used for extruding the protruding part of the primary blank III upwards to form the stacking, so as to obtain a primary blank IV;
6) A shaping station for shaping the primary blank IV to obtain a primary blank V with the inner diameter smaller than the designed inner diameter by 0.1mm, the outer diameter smaller than the designed outer diameter by 0.07mm and the wall thickness of 2.65 mm;
7) A roughness finishing station for finishing the primary blank five to obtain a product with the inner wall roughness smaller than Ra0.03 and the wall thickness of 2.5+/-0.01 mm;
the work stations comprise an upper die holder and a lower die holder, and the work pieces are transferred between the work stations through a transfer clamp; each station comprises a lower female die fixedly arranged on the lower die holder and a punch corresponding to the lower female die and arranged on the upper die holder; the lower female dies of the shaping station and the roughness finishing station comprise a cylindrical cavity; concentricity of the lower female die and the punch of the shaping station and the roughness finishing station is less than or equal to 0.005mm, and the tolerance of the inner diameter of the lower female die and the tolerance of the outer diameter of the punch of the shaping station and the roughness finishing station are +/-0.005 mm;
the inner diameter of the lower female die of the side forming station is 0.8mm larger than the outer diameter of the workpiece, and the lower female dies of the side stacking station, the shaping station and the roughness finishing station all comprise grooves for accommodating stacked materials.
2. The side-stacked workpiece stamping device according to claim 1, wherein the surfaces of the punch and the lower die of the roughness finishing station are plated with a titanium alloy layer, the thickness of the titanium alloy layer is smaller than 2 μm, and the surface roughness of the titanium alloy layer is smaller than or equal to Ra0.01.
3. The side stacking workpiece stamping device according to claim 1, wherein a side forming punch is sleeved on the punch of the side forming station, the side forming punch consists of a plurality of sub punches which are circumferentially arranged, and the side forming punch comprises a central hole for the punch to pass through; the lower parts of the inner sides of the sub-punches are respectively provided with a wedge-shaped guide surface towards the inner side, and the punches of the side forming stations comprise a conical part matched with the wedge-shaped guide surfaces.
4. A side stack workpiece stamping apparatus as claimed in claim 3, wherein the sub-punch comprises a tail portion and a head portion of a hard material, the tail portion and the head portion being joined by a middle portion of a flexible material, the wedge-shaped guide surface being provided at the head portion.
5. The side stacker work-piece stamping device of claim 4, wherein the punches of the side forming station include a stopper located at the front of the tapered portion, all of the sub-punches being connected by a plurality of elastic cords such that the sub-punches are wrapped around the punches of the side forming station.
6. The side-stacked workpiece stamping device according to any one of claims 4 to 5, wherein two side forming sliders are horizontally movably arranged on lower die holders of the side forming stations, the shaping stations, the side stacking stations, the shaping stations and the roughness finishing stations, guide inclined planes are arranged on the outer sides of the side forming sliders, and two slotting tools for driving the side forming sliders to horizontally move are arranged on upper die holders of the side forming stations, the shaping stations, the side stacking stations, the shaping stations and the roughness finishing stations at positions corresponding to the guide inclined planes.
7. The side stacking workpiece stamping device according to claim 1, wherein the transfer clamp comprises a horizontal rail and a reciprocating cylinder, the horizontal rail is arranged on the lower die holder, two sliding blocks are movably arranged on the horizontal rail, the reciprocating cylinder drives the sliding blocks to reciprocate along the horizontal rail, two clamping jaws are horizontally arranged on the sliding blocks, and the two clamping jaw cylinders drive the two clamping jaws to relatively move.
8. A side-face stacked workpiece stamping method, using the side-face stacked workpiece stamping device according to claim 6, the workpiece is of a cup-shaped structure, the outer wall of the middle of the workpiece is provided with an outwardly protruding annular stacked workpiece, the wall thickness of the stacked workpiece is 2.5±0.01mm, the roughness of the inner wall of the stacked workpiece is less than ra0.03, and the height of the stacked workpiece protruding from the outer wall of the workpiece is greater than 15mm, the method is characterized by comprising the following steps:
s1, blanking: die-cutting a round raw material from a metal plate;
s2, prestretching: prestretching the raw materials by a punch head to form a cup-shaped structure, wherein the total length of the cup-shaped structure is less than or equal to 2/3 of the designed total length of the workpiece;
s3, stretching: stretching the primary blank I obtained in the step S2 through a punch head to ensure that the total length of the primary blank I is equal to the total length of a workpiece;
s4, side forming: side punching is carried out on the primary blank II obtained in the step S3 through a side forming punch, so that the middle part of the primary blank II protrudes outwards in an annular mode to form a protruding part, and the line length of the protruding part is equal to that of the stacked material;
s5, side stacking: extruding the primary blank III obtained in the step S4 from bottom to top through a punch and a lower die of a side stacking station, so that a convex part of the primary blank III flows upwards to form the stacking;
s6, shaping: shaping the primary blank IV obtained in the step S5 through a punch and a lower die of a shaping station, so that the appearance is consistent with the product;
s7, fine shaping, namely fine shaping the primary blank five obtained in the S6 through a punch and a lower die of a roughness finishing station to obtain a product with inner wall roughness less than Ra0.03;
s8, discharging and taking out the product.
9. The method of stamping a side stack workpiece according to claim 8, wherein the outer diameter of the punch of the shaping station is 0.1mm smaller than the outer diameter of the punch of the roughness finishing station, and the inner diameter of the lower die of the shaping station is 0.07mm smaller than the inner diameter of the lower die of the roughness finishing station.
10. The method for stamping a side-stacked workpiece according to claim 9, wherein the surfaces of the punch and the lower die of the roughness finishing station are plated with a titanium alloy layer, the thickness of the titanium alloy layer is less than 2 μm, and the surface roughness of the titanium alloy layer is less than or equal to ra0.01.
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