A forming machining system and machining process for a curved sheet metal part

Abstract

The application discloses a forming and machining system for a curved sheet metal part and a machining process thereof. The forming and machining system comprises forming dies, edge milling dies, shaping dies and punching dies arranged in sequence according to procedures. The forming dies are used for pressing sheet metal plates into formed curved sheet metal parts. The edge milling dies are used for machining and removing the excess sheet metal material around the formed curved sheet metal parts, so that the curved sheet metal parts can be welded. The shaping dies are used for secondary forming of the curved sheet metal parts. The punching dies are used for punching machining of the curved sheet metal parts. The forming and machining system improves the machining efficiency of the curved sheet metal parts, and reduces the possibility of machining defects such as scratches, creases, scratches, drawing marks and the like, and has good practicability.

Description

Technical Field

[0001] This invention belongs to the technical field of curved sheet metal forming and processing equipment, specifically relating to a forming and processing system for curved sheet metal parts and its processing technology. Background Technology

[0002] like Figure 1 As shown, the curved sheet metal part to be processed is used in the exhaust casing of a certain type of aero-engine. The exhaust casing is formed by welding 18 curved sheet metal parts. The raw material thickness of this curved sheet metal part is 1.4mm, and the minimum thickness after forming is 1.12mm. This curved sheet metal part must not have processing defects such as dents, scratches, wrinkles, or drawing marks after processing. In addition, a 16mm diameter circular hole needs to be machined on this sheet metal part. According to the previous technology, the forming and processing of such complex curved surfaces requires multiple forming and shaping processes, thus requiring multiple sets of molds for processing, and machining this circular hole is also relatively difficult. The present invention adopts a step-by-step processing and forming technology, which simplifies the complex process and reduces processing costs. Summary of the Invention

[0003] The purpose of this invention is to provide a forming and processing system for curved sheet metal parts and its processing technology, which aims to process curved sheet metal parts efficiently and with high quality.

[0004] This invention is mainly achieved through the following technical solutions:

[0005] A forming system for curved sheet metal parts includes a forming mold, a milling mold, a shaping mold, and a punching mold arranged sequentially according to the process steps. The forming mold is used to press a sheet metal plate into a formed curved sheet metal part. The milling mold is used to process and remove excess sheet metal material around the edges of the formed curved sheet metal part to facilitate welding. The shaping mold is used to perform secondary forming on the curved sheet metal part. The punching mold is used to punch holes in the curved sheet metal part.

[0006] To better realize the present invention, the forming mold further includes a base, an upper template, a lower template, a forming die, a forming punch, an ejector plate, a top plate, ejector rods, and a guide mechanism; the lower template is fixedly installed on the top of the base, and a top plate is installed at the bottom; the upper template is installed above the lower template, and guide mechanisms are respectively installed on both sides between the lower template and the upper template; the forming punch is fixedly installed in the middle of the top of the lower template, and the forming die is fixedly connected to the upper template; an ejector plate is installed on the lower template outside the forming punch, and a plurality of ejector rods are installed on the top of the top plate, the top ends of the ejector rods sliding through the lower template and connecting to the ejector plate, and the top of the ejector plate abutting against the forming die; the top of the upper template and the bottom of the top plate are respectively connected to the driving end of the pressure driving mechanism.

[0007] To better realize the present invention, the molding die further includes guide pillars, and guide pillars are respectively provided on both sides between the top plate and the molding die. The guide pillars are fixedly connected to the lower template, and the top plate and the molding die are slidably connected to the guide pillars.

[0008] To better realize the present invention, the top plate and the forming die are respectively provided with matching toothed end faces at their contact points.

[0009] To better realize the present invention, the base body further includes a first base and a second base. The bottom ends of the lower template are respectively provided with the first base, and the middle part is provided with a plurality of second bases. The second base is an inverted U-shaped structure to avoid the lifting and lowering of the top plate.

[0010] To better realize the present invention, the milling die further includes a milling punch, a milling die, a first pressure plate, a second pressure plate, a stud, and a column. The milling punch is provided at the center of the top of the milling die, and the second pressure plate is provided above the punch. The two ends of the second pressure plate are respectively connected to the milling die through the column. One end of the stud passes downward through the second pressure plate and is connected to the first pressure plate. The first pressure plate abuts against the top of the punch. The stud is threadedly connected to the second pressure plate, and a rotating pin is provided laterally at the top of the stud.

[0011] To better realize the present invention, the forming mold further includes an upper pressing template, a lower pressing template, a forming die, a forming punch, and a guiding mechanism. The forming punch is fixedly installed on the top of the lower pressing template, and the forming die is fixedly installed on the bottom of the upper pressing template. Guiding mechanisms are respectively provided on both sides between the upper pressing template and the lower pressing template. The top of the upper pressing template is connected to the driving end of the pressure driving mechanism.

[0012] To better realize the present invention, the punching die further includes a mounting base, a lower punching die, a punching die, and a punching punch; the mounting base has a V-shaped groove, the lower punching die is installed obliquely inside the groove, the higher end of the upper part of the lower punching die is provided with a plurality of positioning pins, the curved sheet metal part is provided with corresponding positioning holes, the lower end of the upper part of the lower punching die is provided with a punching die, and the lower end of the upper part of the lower punching die is provided with a punching groove corresponding to the middle through hole of the punching die, and the punching punch is provided above the punching die.

[0013] To better realize the present invention, the punching die further includes a punch fixing plate and a die shank, the bottom of which is connected to the punching punch through the punch fixing plate.

[0014] This invention is mainly achieved through the following technical solutions:

[0015] A forming process for curved sheet metal parts, using the aforementioned forming system, includes the following steps:

[0016] Step S1: Forming: Under hydraulic pressure, the upper pressure column of the press drives the upper template of the forming mold to move linearly along the guide mechanism, creating a gap between the forming die and the forming punch of the forming mold; then, the lower pressure column of the press drives the top plate and the ejector plate of the forming mold to move linearly along the guide column, moving the ejector plate to a position parallel to the forming punch, placing the sheet metal plate above the forming punch and the ejector plate; then, the hydraulic pressure of the upper pressure column is made greater than that of the lower pressure column, at which point the upper template and the forming die move downwards, causing the forming die and the forming punch to close, pressing the sheet metal plate into a curved sheet metal part, and at this time the ejector plate is also pressed down;

[0017] Step S2: Milling excess sheet metal around the curved sheet metal part: Place the formed curved sheet metal part into the middle of the milling die cavity of the milling mold, then place the milling punch of the milling mold above the curved sheet metal part, fix the second pressure plate of the milling mold above the milling punch, the second pressure plate is installed horizontally, and the first pressure plate of the milling mold is pressed against the top of the milling punch, so that the curved sheet metal part is fixed in the milling mold, and the entire milling mold is placed on the milling machine to mill the sheet metal on the top and bottom sides; then disassemble the milling mold so that the second pressure plate is installed vertically to press the milling punch, and then place the entire milling mold on the milling machine to mill the sheet metal on the left and right sides;

[0018] Step S3: Perform secondary forming on the curved sheet metal part: Place the milled curved sheet metal part between the forming die and the forming punch of the forming mold, and then press down the upper pressing plate and the forming die to achieve forming;

[0019] Step S4: Punching the curved sheet metal part: Place the shaped curved sheet metal part on the lower punch of the punching die, and insert the positioning hole of the curved sheet metal part into the positioning pin on the lower punch. Then, punch the punching punch of the punching die downward.

[0020] The beneficial effects of this invention are as follows:

[0021] (1) The present invention improves the processing efficiency of curved sheet metal parts by sequentially cooperating with forming mold, milling mold, shaping mold and punching mold, and reduces the possibility of processing defects such as bumps, scratches, wrinkles, and drawing marks, and has good practicality.

[0022] (2) The present invention realizes the feeding and processing of sheet metal flat plates by driving the upper template and top plate of the forming mold; the guiding mechanism and guide column of the forming mold improve the stability and accuracy of processing; the setting of the first base and the second base ensures the support stability and the flexible movement of the top plate, and has good practicality.

[0023] (3) The present invention achieves flexible pressing of curved sheet metal parts by means of the second pressure plate and the first pressure plate in the milling mold, which facilitates the conversion processing of the left and right sides and the top and bottom sides of the curved sheet metal parts, and has good practicality.

[0024] (4) The present invention realizes secondary forming of the milled curved sheet metal parts through the forming die and the forming punch of the forming mold, which reduces the generation of defects and has good practicality;

[0025] (5) The present invention facilitates the positioning and placement of curved sheet metal parts by means of the V-shaped groove on the mounting base of the punching die and the positioning pin on the stamping die; the inclined stamping die facilitates the positioning and placement of curved sheet metal parts and facilitates punching and material discharge, thus having good practicality. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the three-dimensional structure of a curved sheet metal part;

[0027] Figure 2 This is a schematic diagram of the three-dimensional structure of the molding die;

[0028] Figure 3 This is a schematic diagram of the connection structure between the ejector plate and the guide pillar of the forming mold;

[0029] Figure 4 This is a schematic diagram of the connection structure between the forming punch and the lower template of the forming die;

[0030] Figure 5 This is a schematic diagram of the cross-sectional structure of the molding die;

[0031] Figure 6 for Figure 5 A cross-sectional schematic diagram of HH in the middle;

[0032] Figure 7 This is a three-dimensional structural diagram of a milling die;

[0033] Figure 8 This is a schematic diagram of the cross-sectional structure of a milling die;

[0034] Figure 9 This is a schematic diagram of the milling die.

[0035] Figure 10 This is a three-dimensional structural diagram of the shaping mold;

[0036] Figure 11 This is a cross-sectional structural diagram of the shaping mold;

[0037] Figure 12 This is a schematic diagram of the forming punch structure of the forming die;

[0038] Figure 13 This is a schematic diagram of the forming die structure of a forming mold;

[0039] Figure 14 This is a three-dimensional structural diagram of a punching die;

[0040] Figure 15 This is a schematic diagram of the connection structure between the lower punch of a punching die and the locating pin.

[0041] Figure 16 This is a schematic diagram of the cross-sectional structure of a punching die;

[0042] Figure 17 This is a schematic diagram of the mounting base for a punching die.

[0043] in:

[0044] 1-First base, 3-Ejector rod, 4-Second base, 6-Lower template, 8-Guide post, 10-Ejector plate, 11-Guide post seat, 12-Forming punch, 13-Guide post, 14-Forming die, 16-Guide sleeve, 17-Upper template, 18-Upper limit post, 23-Lower limit post, 25-Top plate, 27-Punch pad, 29-Positioning block;

[0045] 31-Milling die, 33-Milling punch, 34-First pressure plate, 35-Column, 36-Second pressure plate, 38-Stud, 39-Rotating pin;

[0046] 42-Lower pressing plate, 45-Shaping punch, 47-Shaping die, 48-Upper pressing plate;

[0047] 51-Mounting base, 52-Mounting pad, 53-Punching die, 54-Punching die, 55-Punching punch, 56-Punch fixing plate, 57-Die shank, 59-Positioning pin. Detailed Implementation

[0048] Example 1:

[0049] A forming system for curved sheet metal parts includes a forming mold, a milling mold, a shaping mold, and a punching mold arranged sequentially according to the process steps. The forming mold is used to press a sheet metal plate into a formed curved sheet metal part. The milling mold is used to process and remove excess sheet metal material around the edges of the formed curved sheet metal part to facilitate welding. The shaping mold is used to perform secondary forming on the curved sheet metal part. The punching mold is used to punch holes in the curved sheet metal part.

[0050] This invention improves the processing efficiency of curved sheet metal parts by using a combination of forming mold, milling mold, shaping mold and punching mold, and reduces the possibility of processing defects such as bumps, scratches, wrinkles, and drawing marks, and has good practicality.

[0051] Example 2:

[0052] This embodiment is an optimization based on Embodiment 1, such as... Figures 2-5 As shown, the forming mold includes a base, an upper template 17, a lower template 6, a forming die 14, a forming punch 12, an ejector plate 10, an ejector plate 25, ejector rods 3, and a guide mechanism. The lower template 6 is fixedly mounted on the top of the base, and the ejector plate 25 is mounted on the bottom. The upper template 17 is mounted above the lower template 6, and guide mechanisms are respectively provided on both sides between the lower template 6 and the upper template 17. The forming punch 12 is fixedly mounted in the middle of the top of the lower template 6, and the forming die 14 is fixedly connected to the upper template 17. An ejector plate 10 is mounted on the lower template 6 outside the forming punch 12. Several ejector rods 3 are mounted on the top of the ejector plate 25. The top ends of the ejector rods 3 slide through the lower template 6 and connect to the ejector plate 10. The top of the ejector plate 10 abuts against the forming die 14. The top of the upper template 17 and the bottom of the ejector plate 25 are respectively connected to the driving end of the pressure driving mechanism. Preferably, as shown... Figure 6 As shown, a forming punch 12 is fixedly installed at the center of the top of the lower template 6 via a punch pad 27.

[0053] Preferably, such as Figures 3-5 As shown, the molding die also includes guide pillars 8. Guide pillars 8 are respectively provided on both sides between the top plate 10 and the molding die 14. The guide pillars 8 are fixedly connected to the lower template 6. The top plate 10 and the molding die 14 are slidably connected to the guide pillars 8.

[0054] Preferably, such as Figure 5 As shown, the top plate 10 and the forming die 14 are respectively provided with matching toothed end faces at their contact points. Preferably, the top plate 10 is a closed frame structure, with a clearance through hole in the middle corresponding to the forming punch 12.

[0055] Preferably, such as Figures 2-4 As shown, the base includes a first base 1 and a second base 4. The bottom ends of the lower template 6 are respectively provided with the first base 1, and a plurality of second bases 4 are respectively provided in the middle. The second base 4 has an inverted U-shaped structure to avoid the lifting and lowering of the top plate 25. Preferably, two second bases 4 are symmetrically arranged in the middle of the bottom of the lower template 6.

[0056] Preferably, such as Figures 2-5As shown, the guiding mechanism includes a guide post 13 seat 11, a guide post 13, and a guide sleeve 16. The guide post 13 seat 11 is installed on the top of the lower template 6, and the guide post 13 is vertically installed inside the guide post 13 seat 11. A through hole is correspondingly opened on the upper template 17, and a through guide sleeve 16 is installed in the through hole. The guide sleeve 16 is slidably connected to the guide post 13.

[0057] Preferably, the molding die further includes a limiting mechanism. A plurality of limiting mechanisms are arranged circumferentially along the periphery between the lower mold plate 6 and the upper mold plate 17. Each limiting mechanism includes an upper limiting post 18 and a lower limiting post 23. The lower mold plate 6 and the upper mold plate 17 are respectively provided with the upper limiting post 18 and the lower limiting post 23. Preferably, the upper limiting post 18 and the lower limiting post 23 are respectively provided at the four corners of the lower mold plate 6 and the upper mold plate 17.

[0058] In the forming mold, the first base 1 and the second base 4 together support the lower template 6. The ejector rod 3 and the top plate 25 are bolted together. The force from below causes the ejector rod 3 and the top plate 25 to move upward. The ejector rod 3 passes through the hole in the lower template 6 and can lift the ejector plate 10. Above the ejector plate 10 is the forming die 14, which is bolted to the upper template 17. There are two guide pillars 8 between the ejector plate 10 and the forming die 14 to ensure that the vertical movement between the ejector plate 10 and the forming die 14 does not cause lateral or longitudinal displacement. At the bottom center of the mold is the punch pad 27, and in the middle center is the forming punch 12. The punch pad 27, the forming punch 12, and the lower template 6 are bolted together and fixed in the middle of the lower template 6. There are two guide pillars 13 on both sides of the upper template 17 and the lower template 6 to guide the movement of the upper template 17 and prevent lateral or longitudinal displacement when the upper template 17 moves up and down. Four positioning blocks 29 are placed between the lower template 6 and the punch pad 27, and between the punch pad 27 and the forming punch 12, to restrict and position the displacement of the punch pad 27 and the forming punch 12. In use, this mold is placed on a press, with the upper pressure column of the press connected to the upper template 17 of the mold, and the lower ejector column of the press connected to the top plate 25 of the mold.

[0059] Example 3:

[0060] This embodiment is an optimization based on embodiment 1 or 2, such as... Figures 7-9As shown, the milling die includes a milling punch 33, a milling die 31, a first pressure plate 34, a second pressure plate 36, a stud 38, and a column 35. The milling punch 33 is disposed at the center of the top of the milling die 31. The second pressure plate 36 is disposed above the punch. The two ends of the second pressure plate 36 are respectively connected to the milling die 31 through the column 35. One end of the stud 38 passes downward through the second pressure plate 36 and is connected to the first pressure plate 34. The first pressure plate 34 abuts against the top of the punch. The stud 38 is threadedly connected to the second pressure plate 36, and a rotating pin 39 is provided laterally on the top of the stud 38.

[0061] like Figure 7 , Figure 8 As shown, the milling die 31 has detachable columns 35 on its left and right sides or front and back sides for flexibly mounting the second pressure plate 36. When milling the front and back sides of a curved sheet metal part, the columns 35 are bolted to the left and right sides of the milling die 31, and the two ends of the second pressure plate 36 are bolted to the columns 35. Then, the rotating pin 39 is rotated to make the stud 38 drive the first pressure plate 34 downward, thereby pressing the milling punch 33. The entire milling die is then placed on a milling machine for peripheral milling of the front and back sides of the curved sheet metal part. Similarly, when milling the left and right sides of a curved sheet metal part, the columns 35 on the left and right sides are removed, and the columns 35 are bolted to the front and back sides of the milling die 31. The second pressure plate 36 is installed, and the first pressure plate 34 is tightened to press the milling punch 33. The entire milling die is then placed on a milling machine for peripheral milling of the left and right sides of the curved sheet metal part.

[0062] In the milling fixture, after the curved sheet metal part is formed, the excess sheet metal around the curved sheet metal part needs to be processed to leave a reasonable allowance for welding. Rotate the rotary pin 39 and stud 38 to lift the first pressure plate 34 upwards, remove the milling punch 33, place the formed curved sheet metal part into the middle of the milling die 31, then press the milling punch 33 back onto the curved sheet metal part, pressing the first pressure plate 34 tightly onto the top of the milling punch 33, thus fixing the curved sheet metal part in the mold. Remove the columns 35 on both sides of the second pressure plate 36, and place the mold with the curved sheet metal part installed on it onto the milling machine. According to the corresponding technical requirements, mill the sheet metal material from two of the four sides of the curved sheet metal part. Then remove the second pressure plate 36, dismantle the two side columns 35, reinstall the other two side columns 35, place the second pressure plate 36 on the adjacent column 35, place the mold of the installed curved sheet metal part on a milling machine, and mill away the remaining two sides of the curved sheet metal part. In this way, the excess material around the curved sheet metal part is removed.

[0063] The other parts of this embodiment are the same as those in Embodiment 1 or 2 above, so they will not be described again.

[0064] Example 4:

[0065] This embodiment is an optimization based on any one of embodiments 1-3, such as... Figures 10-13 As shown, the forming mold includes an upper pressing template 48, a lower pressing template 42, a forming die 47, a forming punch 45, and a guiding mechanism. The forming punch 45 is fixedly installed on the top of the lower pressing template 42, and the forming die 47 is fixedly installed on the bottom of the upper pressing template 48. Guiding mechanisms are respectively provided on both sides between the upper pressing template 48 and the lower pressing template 42. The top of the upper pressing template 48 is connected to the driving end of the pressure driving mechanism.

[0066] Preferably, such as Figure 10 , Figure 11 As shown, the guiding mechanism includes a guide post 13 seat 11, a guide post 13, and a guide sleeve 16. The guide post 13 seat 11 is installed on the top of the lower pressing template 42, and the guide post 13 is vertically installed inside the guide post 13 seat 11. A through hole is correspondingly opened on the upper pressing template 48, and a through guide sleeve 16 is installed in the through hole. The guide sleeve 16 is slidably connected to the guide post 13.

[0067] Preferably, such as Figure 10 , Figure 11 As shown, the molding die also includes a limiting mechanism. A plurality of limiting mechanisms are arranged circumferentially on the periphery between the lower pressing platen 42 and the upper pressing platen 48. Each limiting mechanism includes an upper limiting post 18 and a lower limiting post 23. The lower pressing platen 42 and the upper pressing platen 48 are respectively provided with the upper limiting post 18 and the lower limiting post 23. Preferably, the upper limiting post 18 and the lower limiting post 23 are respectively provided at the four corners of the lower pressing platen 42 and the upper pressing platen 48.

[0068] In the forming mold, the lower pressing platen 42 and the forming punch 45 are bolted together, as are the upper pressing platen 48 and the forming die 47. On both sides of the mold, there are two guide pillars 13 to guide the upper pressing platen 48 and the forming die 47 to move up and down, and there are also upper limit pillars 18 and lower limit pillars 23 to limit the movement of the upper pressing platen 48.

[0069] There are four positioning blocks 29 between the lower pressing platen 42 and the forming punch 45, and between the upper pressing platen 48 and the forming die 47, to limit the lateral and longitudinal displacement between the forming die 47 and the forming punch 45. In use, the upper pressing platen 48 and the forming die 47 are lifted, the curved sheet metal part is placed into the upper part of the forming punch 45, and then the upper pressing platen 48 and the forming die 47 are pressed down to perform secondary forming of the sheet metal part. Finally, the upper pressing platen 48 and the forming die 47 are lifted, and the curved sheet metal part is removed.

[0070] The other parts of this embodiment are the same as any one of the embodiments 1-3 above, so they will not be described again.

[0071] Example 5:

[0072] This embodiment is an optimization based on any one of embodiments 1-4, such as... Figures 14-17 As shown, the punching die includes a mounting base 51, a lower punching die 53, a punching die 54, and a punching punch 55. The mounting base 51 has a V-shaped groove, inside which the lower punching die 53 is installed at an incline. Several locating pins 59 are protruding from the higher top end of the lower punching die 53. Corresponding locating holes are provided on the curved sheet metal part. The lower top end of the lower punching die 53 has the punching die 54, and a punching groove is provided inside the lower punching die 54 corresponding to the central through hole. The punching punch 55 is positioned above the punching die 54. Preferably, two locating pins 59 are provided at the higher top end of the lower punching die 53. Preferably, the punching die 54 is embedded in the lower punching die 53. Preferably, the bottom of the punching punch 55 is an inclined end face for easy punching. Preferably, the punching groove is a through hole.

[0073] Preferably, such as Figures 14-16 As shown, the punching die also includes a punch fixing plate 56 and a die shank 57, the bottom of which is connected to the punching punch 55 via the punch fixing plate 56.

[0074] Preferably, such as Figure 16 As shown, the mounting base 51 is fixedly mounted on the lower stamping die 53 via a mounting pad 52. The mounting pad 52 is parallel to the lower stamping die 53 and is fixedly connected by screws. One side of the V-shaped groove has several screw mounting holes. Preferably, as shown... Figure 17 As shown, a limiting protrusion is provided on one side of one end of the V-shaped groove to limit the mounting pad 52. Preferably, four screw mounting holes are provided on one side of the V-shaped groove.

[0075] In the punching die, the shaped curved sheet metal part is placed above the lower punching die 53. The lower punching die 53 has two locating pins 59, and the curved sheet metal part has locating holes, which can position the curved sheet metal part in the lower punching die 53. Then the punching punch 55 and the punching punch 55 fixing plate punch downwards to punch holes, thus completing the processing of holes in the curved sheet metal part.

[0076] The other parts of this embodiment are the same as any one of the embodiments 1-4 above, so they will not be described again.

[0077] Example 6:

[0078] A forming process for curved sheet metal parts, using the aforementioned forming system, includes the following steps:

[0079] Step S1: Processing and forming: Under the action of oil pressure, the upper pressure column of the press drives the upper template 17 of the forming mold to move linearly along the guide mechanism, so that the forming die 14 and the forming punch 12 of the forming mold have a gap; then the lower pressure column of the press drives the top plate 25 and the ejector plate 10 of the forming mold to move linearly along the guide column 8, so that the ejector plate 10 moves to a position parallel to the forming punch 12, and the sheet metal plate is placed above the forming punch 12 and the ejector plate 10; then, the oil pressure of the upper pressure column is made greater than the oil pressure of the lower pressure column, at which time the upper template 17 and the forming die 14 move downward, so that the forming die 14 and the forming punch 12 close, and the sheet metal plate is pressed into a curved sheet metal part. At this time, the ejector plate 10 is also pressed down.

[0080] Step S2: Milling excess sheet metal around the curved sheet metal part: Place the formed curved sheet metal part into the middle of the milling die 31 of the milling die, then place the milling punch 33 of the milling die above the curved sheet metal part, fix the second pressure plate 36 of the milling die above the milling punch 33, with the second pressure plate 36 installed horizontally, and press the first pressure plate 34 of the milling die against the top of the milling punch 33, so that the curved sheet metal part is fixed in the milling die. Place the entire milling die on the milling machine to mill the sheet metal on the top and bottom sides; then disassemble the milling die so that the second pressure plate 36 is installed vertically to press the milling punch 33, and then place the entire milling die on the milling machine to mill the sheet metal on the left and right sides;

[0081] Step S3: Perform secondary forming on the curved sheet metal part: Place the milled curved sheet metal part between the forming die 47 and the forming punch 45 of the forming mold, and then press down the upper pressing plate 48 and the forming die 47 to achieve forming;

[0082] Step S4: Punching the curved sheet metal part: Place the shaped curved sheet metal part on the lower punching die 53 of the punching die, and insert the positioning hole of the curved sheet metal part into the positioning pin 59 on the lower punching die 53. Then, punch the punching punch 55 of the punching die downward.

[0083] In step S1, before forming, a sheet metal plate needs to be taken, with an area approximately equal to that of the ejector plate 10. The forming process is as follows: First, under hydraulic pressure, the upper pressure column of the press, the upper template 17 of the mold, and the forming die 14 move upward, creating a gap between the forming die 14 and the forming punch 12. Second, under hydraulic pressure, the lower ejector column of the press, the ejector plate 25 of the mold, the ejector rod 3, and the ejector plate 10 move upward, with the ejector plate 10 moving to a position basically parallel to the forming punch 12. Third, the sheet metal plate is placed above the forming punch 12 and the ejector plate 10, and then the hydraulic press is started, making the upper hydraulic pressure greater than the lower hydraulic pressure. The upper template 17 and the forming die 14 move downward, allowing the forming die 14 and the forming punch 12 to close, pressing the sheet metal plate into a curved sheet metal part, and the ejector plate 10 is also pressed into the bottom. Fourth, lift the upper template 17 and the forming die 14 of the mold, and take out the formed curved sheet metal part.

[0084] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A forming and processing system for curved sheet metal parts, characterized in that, The assembly includes a forming mold, a milling mold, a shaping mold, and a punching mold arranged sequentially according to the process steps. The forming mold is used to press sheet metal flat plates into shaped curved sheet metal parts. The milling mold is used to process and remove excess sheet metal material around the edges of the shaped curved sheet metal parts to facilitate welding. The shaping mold is used to perform secondary shaping on the curved sheet metal parts. The punching mold is used to perform punching processing on the curved sheet metal parts. The forming mold includes a base, an upper template (17), a lower template (6), a forming die (14), a forming punch (12), an ejector plate (10), a top plate (25), an ejector rod (3), and a guide mechanism; the lower template (6) is fixedly installed on the top of the base, and the top plate (25) is installed at the bottom; the upper template (17) is installed above the lower template (6), and guide mechanisms are respectively installed on both sides between the lower template (6) and the upper template (17); a forming punch is fixedly installed in the middle of the top of the lower template (6). The mold (12) is fixedly connected to the upper template (17) and the forming die (14). A top plate (10) is provided on the lower template (6) outside the forming punch (12). A number of top rods (3) are provided on the top of the top plate (25). The top of the top rods (3) slides through the lower template (6) and is connected to the top plate (10). The top of the top plate (10) abuts against the forming die (14). The top of the upper template (17) and the bottom of the top plate (25) are respectively connected to the driving end of the pressure driving mechanism. The milling die includes a milling punch (33), a milling die (31), a first pressure plate (34), a second pressure plate (36), a stud (38), and a column (35). The milling die (33) is provided at the middle of the top of the milling die (31). The second pressure plate (36) is provided above the punch. The two ends of the second pressure plate (36) are connected to the milling die (31) through the column (35). One end of the stud (38) passes downward through the second pressure plate (36) and is connected to the first pressure plate (34). The first pressure plate (34) abuts against the top of the punch. The stud (38) is threadedly connected to the second pressure plate (36), and a rotating pin (39) is provided laterally at the top of the stud (38). The forming mold includes an upper pressing template (48), a lower pressing template (42), a forming die (47), a forming punch (45), and a guiding mechanism. The forming punch (45) is fixedly installed on the top of the lower pressing template (42), and the forming die (47) is fixedly installed on the bottom of the upper pressing template (48). Guiding mechanisms are respectively provided on both sides between the upper pressing template (48) and the lower pressing template (42). The top of the upper pressing template (48) is connected to the driving end of the pressure driving mechanism.

2. The forming and processing system for curved sheet metal parts according to claim 1, characterized in that, The forming mold also includes guide pillars (8). Guide pillars (8) are provided on both sides between the top plate (10) and the forming die (14). The guide pillars (8) are fixedly connected to the lower template (6). The top plate (10) and the forming die (14) are slidably connected to the guide pillars (8).

3. A forming and processing system for curved sheet metal parts according to claim 1 or 2, characterized in that, The top plate (10) and the forming die (14) are respectively provided with matching toothed end faces at their contact points.

4. The forming and processing system for curved sheet metal parts according to claim 1, characterized in that, The base includes a first base (1) and a second base (4). The bottom ends of the lower template (6) are respectively provided with the first base (1) and the middle part is provided with a number of second bases (4). The second base (4) is an inverted U-shaped structure, which is used to avoid the lifting and lowering of the top plate (25).

5. The forming and processing system for curved sheet metal parts according to claim 1, characterized in that, The punching die includes a mounting base (51), a lower punching die (53), a punching die (54), and a punching punch (55). The mounting base (51) has a V-shaped groove, and the lower punching die (53) is installed obliquely inside the groove. Several positioning pins (59) are provided on the higher end of the upper part of the lower punching die (53). Positioning holes are provided on the curved sheet metal part. The lower end of the upper part of the lower punching die (53) is provided with a punching die (54), and a punching groove is provided inside the middle through hole of the punching die (54). The punching punch (55) is provided above the punching die (54).

6. The forming and processing system for curved sheet metal parts according to claim 5, characterized in that, The punching die also includes a punch fixing plate (56) and a die shank (57), the bottom of which is connected to the punching punch (55) via the punch fixing plate (56).

7. A forming process for curved sheet metal parts, characterized in that, The molding process, performed using the molding system described in claim 5 or 6, includes the following steps: Step S1: Processing and forming: Under the action of oil pressure, the upper pressure column of the press drives the upper template (17) of the forming mold to move linearly along the guide mechanism, so that the forming die (14) and forming punch (12) of the forming mold have a gap; then the lower pressure column of the press drives the top plate (25) and the ejector plate (10) of the forming mold to move linearly along the guide column (8), so that the ejector plate (10) moves to a position parallel to the forming punch (12), and the sheet metal plate is placed above the forming punch (12) and the ejector plate (10); then, the oil pressure of the upper pressure column is greater than the oil pressure of the lower pressure column, at this time the upper template (17) and the forming die (14) move downward, so that the forming die (14) and the forming punch (12) close, and the sheet metal plate is pressed into a curved sheet metal part, at this time the ejector plate (10) is also pressed down; Step S2: Milling the excess sheet metal around the curved sheet metal part: Place the formed curved sheet metal part into the middle of the milling die (31) of the milling die, then place the milling punch (33) of the milling die above the curved sheet metal part, fix the second pressure plate (36) of the milling die above the milling punch (33), the second pressure plate (36) is installed horizontally, and the first pressure plate (34) of the milling die is pressed against the top of the milling punch (33), so that the curved sheet metal part is fixed in the milling die, and the entire milling die is placed on the milling machine to mill the sheet metal on the upper and lower sides; then disassemble the milling die so that the second pressure plate (36) is installed vertically to press the milling punch (33), and then place the entire milling die on the milling machine to mill the sheet metal on the left and right sides; Step S3: Perform secondary forming on the curved sheet metal part: Place the milled curved sheet metal part between the forming die (47) and the forming punch (45) of the forming mold, and then press down the upper pressing plate (48) and the forming die (47) to achieve forming; Step S4: Punch the curved sheet metal part: Place the shaped curved sheet metal part on the punching lower die (53) of the punching die, and insert the positioning hole of the curved sheet metal part into the positioning pin (59) on the punching lower die (53) for positioning. Then, punch the punching punch (55) of the punching die downward.

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