Shell machining mold and machining process

Abstract

The invention discloses a shell machining mold and a machining process, and relates to the technical field of sheet metal machining, the mold comprises an upper mold and a lower mold, and the upper mold is provided with an upper mold forming plate or a shaping mold plate; a variable-radius structure is arranged on the upper die forming plate corresponding to the forming position of a circular bead R in the shell, and a uniform-radius structure is arranged on the shaping template corresponding to the forming position of the circular bead R in the shell; the process comprises the following steps: step 1, stretching; step 2, shaping; step 3, trimming; step 4, flanging; and fifthly, side punching and riveting are conducted. The variable-radius structure is arranged at the fillet R forming position of the upper die forming plate, variable-radius stretching is carried out on a material plate, after variable-radius stretching is finished, a shaping template is replaced for shaping, the fillet R of the shell is shaped into the design size, and the phenomenon that stretching cracks are generated when the size of the fillet R at the bottom of the shell is small and the overall stretching distance is large is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of sheet metal processing, and particularly relates to a shell processing die and a processing technology. Background Art

[0002] As a common structural part in modern industrial manufacturing, the processing technology of sheet metal metal shells involves precise coordination of multiple processes, which is a key link to achieve product functionality and aesthetics. For the metal outer shell of a photovoltaic inverter, traditional processing technologies usually include the following processes: stretching, trimming, flanging, side punching, riveting, etc.

[0003] However, due to functional requirements and different customers having different dimensional parameter requirements for such products. For example Figure 14 As shown, when the radius R of the rounded corner at the bottom of the shell 100 required by the customer is small and the overall stretching depth H is large, product cracking is likely to occur during the stretching stage (as Figure 15 shown), resulting in product defects.

[0004] Therefore, it is urgent to develop a die structure and a processing technology to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a shell processing die and a processing technology to solve the problem that when the radius R of the rounded corner at the bottom of the shell is small and the overall stretching depth H is large, product cracking is likely to occur during the stretching stage.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A shell processing die includes an upper die and a lower die, and an upper die forming plate or a shaping template is arranged on the upper die;

[0008] A variable radius structure is arranged on the upper die forming plate corresponding to the forming position of the rounded corner R in the shell. The variable radius structure includes a straight rounded corner part, a transition rounded corner area, and a variable radius rounded corner part;

[0009] The rounded corner radius of the variable radius rounded corner part is greater than the rounded corner radius of the straight rounded corner part, and the rounded corner radius of the straight rounded corner part is greater than or equal to twice the radius of the rounded corner R in the shell;

[0010] A uniform radius structure is arranged on the shaping template corresponding to the forming position of the rounded corner R in the shell. The rounded corner radius of the uniform radius structure is equal to the radius of the rounded corner R in the shell;

[0011] A chamfering system is arranged on the lower die, and the chamfering system chamfers the blank during the stretching process.

[0012] As a further solution of the present invention: the ratio of the fillet radius R2 of the variable-radius fillet part to the overall drawing depth H of the product is 1:7 - 7.5.

[0013] As a further solution of the present invention: the upper die includes an upper die fixing plate, and a plurality of groups of upper support seats are arranged on the bottom surface of the upper die fixing plate. The bottom surfaces of the plurality of groups of upper support seats are connected to an upper die bottom plate in a matching manner. The bottom surface of the upper die bottom plate is connected to an upper die intermediate plate, and the upper die forming plate is connected to the bottom of the upper die intermediate plate;

[0014] An upper fitting cavity is formed in the middle of the upper die intermediate plate, an upper forming cavity is formed in the middle of the upper die forming plate, and an upper die push plate is movably arranged in the upper fitting cavity.

[0015] As a further solution of the present invention: a plurality of groups of guide rods I are connected to the back surface of the upper die push plate. The plurality of groups of guide rods I all extend upward and penetrate through the upper die bottom plate. A cylinder is arranged at the top of the hydraulic press, and the ejector rod of the cylinder is connected to the upper die push plate.

[0016] As a further solution of the present invention: the lower die includes two symmetrically arranged lower die fixing plates. The top of each of the two lower die fixing plates is connected to a lower support seat, and the tops of the two lower support seats are connected to a lower die bottom plate in a matching manner;

[0017] A top plate is arranged at the bottom of the lower die bottom plate. A plurality of groups of guide rods II are arranged on the top surface of the top plate. The other ends of the plurality of groups of guide rods II penetrate through the lower die bottom plate and are connected to a lower die intermediate plate. The top of the lower die intermediate plate is connected to a lower die forming plate;

[0018] A lower fitting cavity is formed in the middle of the lower die intermediate plate, a lower forming cavity is formed in the middle of the lower die forming plate, a forming seat is arranged in the lower fitting cavity, a fixing plate is connected to the bottom of the forming seat, and a plurality of groups of connecting seats are arranged at the bottom of the fixing plate. The bottom surfaces of the plurality of groups of connecting seats are connected to the lower die bottom plate in a matching manner.

[0019] As a further solution of the present invention: the corner cutting system includes cutting knife assemblies arranged at the four corners of the lower die bottom plate corresponding to the blank, and blanking grooves opened at the corresponding positions of the lower die bottom plate. Each cutting knife assembly is arranged corresponding to each blanking groove.

[0020] The cutting knife assembly includes a cutting base. A guide material inclined surface is arranged on the outer side of the top of the cutting base, a cutter head is arranged on the inner side of the top of the cutting base, a material corner support surface is arranged on the top of the cutting base, and the material corner support surface is flush with the top surface of the cutter head.

[0021] As a further solution of the present invention: the guide material inclined surface longitudinally inclines downward from the upper end of the cutting base, and the inclination direction is outward;

[0022] The guiding inclined plane inclines transversely from the side close to the mounting seat to the side far from the mounting seat, and the inclination direction is inwards.

[0023] As a further solution of the present invention: a main air passage and an air outlet passage are provided in the cutting base. An air inlet nozzle is arranged on one side of the main air passage, and the other side is blocked by a sealing plug. An air blowing port is arranged on the air outlet passage through the material corner support surface.

[0024] As a further solution of the present invention: a housing processing process uses the above-mentioned processing die for processing, including the following steps:

[0025] Step 1, stretching: Start the lower jack cylinder of the hydraulic press to lift the lower die forming plate to a position parallel to the material corner support surface. Place the material plate into the lower die. Start the hydraulic press to drive the upper die to move downwards until the upper die forming plate cooperates with the lower die forming plate to press the material plate. Then the upper die forming plate continues to press downwards, and the lower die forming plate moves downwards synchronously and at the same speed under the drive of the lower jack cylinder. During the downward movement, the cutter head of the cutting tool assembly cooperates with the upper cutting angle mating part to cut off the protruding material corner.

[0026] After the upper die forming plate cooperates with the lower die forming plate to press the material plate, connect to the external air source to supply air to the air inlet nozzle, and the air flow flows out from the air blowing port to blow the cut material corner to one side of the blanking chute.

[0027] After cutting the corner, the upper die forming plate and the lower die forming plate continue to move downwards and cooperate with the stationary forming seat to stretch the material plate with a variable radius. After stretching to the set depth, open the die, the upper die moves up and resets. The synchronous cylinder ejector rod extends to push the upper die push plate downwards to separate the product from the upper die forming plate. After the upper die resets, the lower jack cylinder of the hydraulic press moves up to push the top plate upwards, and the top plate drives the lower die forming plate to move up to eject the stretched product formed on the forming seat.

[0028] Step 2, shaping: Place the product after variable radius stretching in another set of dies equipped with shaping templates. Then put the product after variable radius stretching on the forming seat, and the hydraulic press drives the shaping templates to move downwards to shape the variable radius structure.

[0029] Step 3, trimming: Cut off the excess material of the shaped product according to the size.

[0030] Step 4, flanging: Flange the product after cutting off the excess material to form a bottom edge structure.

[0031] Step 5, side punching and riveting: Punch holes on the side of the flanged product, and rivet rivets at the set hole positions after punching.

[0032] The beneficial effects of the present invention:

[0033] The present invention provides a variable radius structure at the rounded corner R forming position of the upper mold forming plate, performs variable radius stretching on the material plate, and after the variable radius stretching is completed, replaces the shaping template for shaping, and shapes the rounded corner R of the shell into the designed size, avoiding the tensile cracking phenomenon when the rounded corner R size of the bottom of the shell is small and the overall stretching distance is large.

[0034] The present invention also provides a corner cutting system on the lower die. By providing this system, the four corners of the sheet are cut off during the variable radius stretching process, eliminating the need for separate sheet processing before stretching, thereby improving the overall shell processing efficiency. Furthermore, by cutting off the four corners of the sheet during the variable radius stretching process, the sheet is easily fed during the variable radius stretching process. Furthermore, because the cutting and the variable radius stretching are performed simultaneously, the cutting is more accurate, and thus the processing is more precise, eliminating the need for excessive excess material, thus saving material.

[0035] The present invention provides an air outlet on the side of the material corner support surface with a larger supporting area. By connecting the air inlet nozzle with an external air source, air enters from the air inlet nozzle and blows out from the air outlet, blowing on one side of the cut material corner, thereby causing the material corner to further tilt toward the side of the blanking trough, so that the material corner can fall toward the side of the blanking trough more stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present invention will be further described below with reference to the accompanying drawings.

[0037] Figure 1 This is a schematic diagram of the clamping state of the material plate in the mold clamping of the present invention;

[0038] Figure 2 It is a schematic diagram of the upper mold structure of the present invention;

[0039] Figure 3 This is a schematic diagram of the variable radius structure of the present invention;

[0040] Figure 4 This is a schematic diagram of the cross-sectional structure of the upper mold of the present invention;

[0041] Figure 5 This is a schematic diagram of the state where the material plate of the present invention is placed on the lower mold;

[0042] Figure 6 This is a schematic diagram of the lower mold structure of the present invention;

[0043] Figure 7 This is a schematic diagram of the cross-sectional structure of the lower mold of the present invention;

[0044] Figure 8 This is a schematic diagram of the positions of the material plate and the corner cutting system of the present invention;

[0045] Figure 9 Schematic diagram of the structure of the corner cutting system of the present invention;

[0046] Figure 10It is a schematic structural diagram of the cutting tool assembly of the present invention;

[0047] Figure 11 It is a schematic diagram of the positional relationship between the main air passage and the air outlet passage of the present invention;

[0048] Figure 12 It is a schematic diagram of the stretching state after chamfering of the present invention;

[0049] Figure 13 It is a schematic diagram of the mold opening state after stretching of the present invention;

[0050] Figure 14 It is a schematic diagram of the housing structure in the prior art;

[0051] Figure 15 It is a schematic diagram of the stretching crack of the housing in the prior art.

[0052] In the figure: 1. Upper mold; 11. Upper mold fixing plate; 12. Upper support seat; 13. Upper mold bottom plate; 14. Upper mold intermediate plate; 141. Relief portion; 15. Upper mold forming plate; 151. Upper chamfering mating portion; 152. Straight fillet portion; 153. Transition fillet area; 154. Variable radius fillet portion; 16. Guide post 1; 17. Guide rod 1; 18. Upper mold push plate; 19. Limit groove; 110. Limit pull rod; 111. Ejector rod through hole; 2. Lower mold; 21. Lower mold fixing plate; 22. Lower support seat; 23. Lower mold bottom plate; 24. Mounting seat; 25. Sliding support seat; 26. Top plate; 27. Guide rod 2; 28. Guide post 2; 29. Guide sleeve 1; 210. Lower mold intermediate plate; 211. Lower mold forming plate; 2111. Lower chamfering mating portion; 213. Precision positioning; 214. Limit slide bar; 215. Forming seat; 216. Fixing plate; 217. Connecting seat; 218. Guide sleeve 2; 219. Counter; 3. Chamfering system; 31. Cutting tool assembly; 311. Cutting material base; 312. Guide material inclined plane; 313. Material angle support surface; 314. Tool bit; 315. Air inlet nozzle; 316. Blowing port; 317. Main air passage; 318. Air outlet passage; 32. Blanking groove; 100. Housing. Detailed implementation manners

[0053] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0054] Embodiment 1

[0055] As Figures 1 - 14As shown in the figure, this embodiment provides a housing processing die, which performs variable-radius stretching and shaping on the housing 100. Through the combination of variable-radius stretching and shaping processing of the die, it is possible to avoid the occurrence of stretching cracking when the radius R of the bottom fillet of the housing 100 is small and the overall stretching depth H is large.

[0056] As Figure 1 shown in the figure, the housing processing die includes an upper die 1 and a lower die 2, which perform variable-radius stretching or shaping processing on the blank when the upper die 1 and the lower die 2 are closed. Among them, the upper die 1 and the lower die 2 are connected to a hydraulic press, and the closing of the die is realized by driving the hydraulic press.

[0057] Specifically, as Figures 2 - 4 shown in the figure, in this embodiment, the upper die 1 includes an upper die fixing plate 11. A plurality of upper support seats 12 are arranged on the bottom surface of the upper die fixing plate 11. The bottom surfaces of the plurality of upper support seats 12 are connected to an upper die bottom plate 13 in a matching manner. The bottom surface of the upper die bottom plate 13 is connected to an upper die intermediate plate 14. An upper die forming plate 15 is connected to the bottom of the upper die intermediate plate 14. An upper matching cavity is opened in the middle of the upper die intermediate plate 14, and an upper forming cavity is opened in the middle of the upper die forming plate 15. The upper forming cavity and the upper matching cavity communicate with each other. An upper die push plate 18 is movably arranged in the upper matching cavity, and there is a gap between the upper die push plate 18 and the side wall of the upper matching cavity. The upper die push plate 18 is adapted to the upper forming cavity. The product in the upper forming cavity is pushed out through the movement of the upper die push plate 18 to avoid sticking of the mold.

[0058] Furthermore, specifically, as Figure 4 shown in the figure, a plurality of first guide rods 17 are connected to the back surface of the upper die push plate 18. The plurality of first guide rods 17 all extend upward and penetrate through the upper die bottom plate 13. A sliding sleeve is arranged on the upper die bottom plate 13 corresponding to the position of the first guide rods 17. The plurality of first guide rods 17 are slidably arranged in the corresponding sliding sleeves. An avoidance hole is opened in the center of the upper die fixing plate 11, and a thimble through hole 111 is opened in the center of the upper die bottom plate 13. The thimble through hole 111 and the avoidance hole are coaxially arranged and correspondingly communicated. A cylinder is arranged at the top of the hydraulic press. The thimble of the cylinder passes through the thimble through hole 111 and the avoidance hole and is connected to the upper die push plate 18 to realize the driving of the upper die push plate 18. With the guiding and limiting of the first guide rods 17, the upper die push plate 18 can move stably and then push the product during demolding to avoid the product sticking to the upper die 1. Further, a plurality of limit pull rods 110 are also slidably arranged on the upper die bottom plate 13. The connecting end of the limit pull rods 110 passes through the upper die bottom plate 13 and is connected to the upper die push plate 18. The limiting end of the limit pull rods 110 is located above the upper die bottom plate 13 to limit the moving distance of the upper die push plate 18.

[0059] Even further, first guide posts 16 are installed at the four corners of the upper die bottom plate 13 for guiding the closing of the die. A plurality of support posts are also symmetrically arranged on the upper die bottom plate 13 to buffer the impact during closing and perform preliminary limiting.

[0060] Furthermore, in order to machine the housing 100 with a relatively small rounded corner R dimension and a relatively large overall stretching depth H, in this embodiment, a variable radius structure is provided at the rounded corner R forming position of the upper die forming plate 15. The variable radius structure includes a straight rounded corner portion 152, a transition rounded corner area 153, and a variable radius rounded corner portion 154. The rounded corner radius of the straight rounded corner portion 152 is R1, and the rounded corner radius of the variable radius rounded corner portion 154 is R2. The dimension of R2 is greater than that of R1, and the dimension of R1 is greater than or equal to twice the R dimension. The rounded corner of the transition rounded corner area 153 connects the straight rounded corner portion 152 and the variable radius rounded corner portion 154 to form a smooth surface. The length L of the transition rounded corner area 153 is 1.2 - 1.8 times the R3 dimension of the housing 100 corner.

[0061] Wherein R2:H = 1:7 - 7.5; L:R3 = 1:1.2 - 1.8.

[0062] In this embodiment, a specific example is used to illustrate. When the rounded corner R dimension of the housing 100 is 4 mm and the stretching depth H = 92 mm, then R1 = 8 mm. After variable radius treatment, R2 = 13 mm, that is, R2:H = 13:92.

[0063] Furthermore, a sizing module is also provided in the upper die 1. The sizing module includes a sizing template, and the structure of the sizing template is the same as that of the upper die forming plate 15, except that the rounded corner R forming position of the sizing module is a uniform radius structure, and its radius dimension is the same as the rounded corner R dimension.

[0064] In this embodiment, after the variable radius stretching is completed, the sizing template can be replaced for sizing to size the rounded corner R of the housing 100 to the designed dimension. Or two sets of molds can be provided. One set of molds is installed with the upper die forming plate 15 for variable radius stretching, and the other set is installed with the sizing template for sizing to improve production efficiency.

[0065] Furthermore, as Figures 5 - 7 shown, the lower die 2 in this embodiment includes two sets of symmetrically arranged lower die fixing plates 21. Lower support seats 22 are connected to the tops of the two sets of lower die fixing plates 21. A lower die bottom plate 23 is connected to the tops of the two lower support seats 22 in a matching manner. Installation platforms are provided at the four corners of the lower die bottom plate 23, and mounting seats 24 are installed on the installation platforms. A first guide bushing 29 is installed in each mounting seat 24. The four first guide bushings 29 are arranged corresponding to the four first guide posts 16 in the upper die 1. During the mold closing process, precise mold closing is achieved through the cooperation of the first guide posts 16 and the first guide bushings 29.

[0066] Furthermore, a top plate 26 is disposed at the bottom of the lower die base plate 23 and between two groups of lower support seats 22. A plurality of second guide rods 27 are provided on the top surface of the top plate 26. The other ends of the plurality of second guide rods 27 penetrate through the lower die base plate 23 and are connected to a lower die intermediate plate 210. The top of the lower die intermediate plate 210 is connected to a lower die forming plate 211, and the lower die forming plate 211 is arranged corresponding to the position of the upper die forming plate 15. A lower mating cavity is formed in the middle of the lower die intermediate plate 210, a lower forming cavity is formed in the middle of the lower die forming plate 211, a forming seat 215 is arranged in the lower mating cavity, the forming seat 215 is arranged with a gap from the side wall of the lower mating cavity, and the forming seat 215 is adapted to the lower forming cavity.

[0067] Further, specifically as Figure 7 shown, a sliding support seat 25 is arranged at the center of the bottom of the lower die base plate 23, and a mating groove is formed in the middle of the top plate 26 corresponding to the position of the sliding support seat 25, and the sliding support seat 25 passes through the mating groove. A plurality of second guide sleeves 218 are arranged on the top of the lower die base plate 23, a second guide post 28 is slidably sleeved in the second guide sleeve 218, and the top of the second guide post 28 is connected to the lower die intermediate plate 210 to realize the guiding of the downward movement of the lower die intermediate plate 210.

[0068] And a fixing plate 216 is connected to the bottom of the forming seat 215, a plurality of connecting seats 217 are arranged at the bottom of the fixing plate 216, and the bottom surfaces of the plurality of connecting seats 217 are cooperatively connected to the lower die base plate 23. The forming seat 215 remains stationary during the mold closing process. The forming structure composed of the lower die forming plate 211, the lower die intermediate plate 210 and the top plate 26 moves up and down in cooperation with the upper die 1, and then cooperates with the stationary forming seat 215 to perform edge radius stretching on the stock plate.

[0069] It should be noted that the forming structure is driven by the lower jack cylinder of the hydraulic press. The lower jack cylinder of the hydraulic press is a prior art, and the specific structure will not be described in detail here.

[0070] Further, as Figures 5 - 7 shown, a plurality of symmetrically arranged fine positioning members 213 are arranged around the lower die forming plate 211, and positioning holes are formed at the corresponding positions of the upper die forming plate 15. Through the cooperation of the fine positioning members 213 and the positioning holes, the precise positioning of the upper die forming plate 15 and the lower die forming plate 211 is realized, and the plurality of fine positioning members 213 can also limit the periphery of the stock plate to ensure that the stock plate is placed in the center for alignment and avoid the offset of the stock plate, which affects the variable radius stretching process.

[0071] And a limiting slide bar 214 is arranged on one side of the lower die base plate 23, and corresponding limiting grooves 19 are respectively formed on the side edges of the upper die forming plate 15 and the upper die intermediate plate 14. A limiting groove 19 is also formed on the corresponding side edge of the lower die forming plate 211. A plurality of limiting grooves 19 are aligned and matched to form a long groove, and the limiting slide bar 214 is movably arranged in the long groove. When the mold opening and forming structure ejects, the limiting slide bar 214 limits the ejection of the lower die forming plate 211.

[0072] Furthermore, a counter 219 is arranged on the lower die base plate 23 to count the number of mold closing times. The counter 219 is a prior art, and its structure and principle will not be described in detail here.

[0073] Embodiment 2

[0074] Based on Embodiment 1, a chamfering system 3 is further arranged on the lower die 2. By arranging the chamfering system 3, during the process of variable radius stretching, the four corners of the blank are cut off, eliminating the need for separate pre-treatment of the blank before stretching (in the traditional process, the blank needs to be chamfered pre-treated before stretching), thus making the processing efficiency of the entire housing 100 higher. And by cutting off the four corners of the blank during the process of variable radius stretching, it is convenient for the blank to feed during variable radius stretching (if the four corners of the blank are not cut off, it is difficult for the blank at the four corners to feed). At the same time, since the material cutting is synchronized with the variable radius stretching, the material cutting is more accurate, and thus the processing is more accurate, and there is no need for too much allowance in the material used, saving materials.

[0075] Specifically, as Figures 8 - 11 shown, in this embodiment, the chamfering system 3 includes cutting tool assemblies 31 arranged at the four corners of the blank on the lower die base plate 23 and blanking grooves 32 formed at the corresponding positions on the lower die base plate 23, and each group of cutting tool assemblies 31 is correspondingly arranged with each blanking groove 32.

[0076] The cutting tool assembly 31 includes a cutting base 311 fixedly connected to the lower die base plate 23. A material guiding inclined surface 312 is arranged on the outer side of the top of the cutting base 311. The material guiding inclined surface 312 longitudinally inclines downward from the upper end of the cutting base 311, and the inclined direction is outward (i.e., close to the blanking groove 32 side), and the material guiding inclined surface 312 transversely inclines from the side close to the mounting seat 24 to the side away from the mounting seat 24, and the inclined direction is inward (i.e., away from the blanking groove 32 side). And a tool head 314 is arranged on the inner side of the top of the cutting base 311. A material corner supporting surface 313 is arranged on the top of the cutting base 311, and the material corner supporting surface 313 is flush with the top surface of the tool head 314.

[0077] Due to the lateral inclination of the material guiding inclined surface 312, the material angle supporting surface 313 becomes smaller along the inclined direction, thereby reducing the support for the material angle after cutting, causing the center of gravity of the falling material angle to deviate towards the side with a smaller supporting area of the material angle supporting surface 313, and further causing the material angle to fall towards the blanking chute 32 side, and timely sliding into the external collection box, avoiding the material angle falling onto the lower die base plate 23, being unable to slip off in time, interfering with the corresponding structures in the mold, and affecting the mold closing of the upper die 1 and the lower die 2.

[0078] Furthermore, in order to further improve the falling direction of the material angle, in this embodiment, a main air duct 317 and an air outlet duct 318 are provided in the material cutting base 311. The main air duct 317 and the air outlet duct 318 are communicated. Among them, the main air duct 317 is inclined, reducing the opening depth of the air outlet duct 318 and improving the processing efficiency. An air inlet nozzle 315 is provided on one side of the main air duct 317, and the other side is blocked by a sealing plug. And the air outlet duct 318 is provided with a blowing port 316 penetrating through the material angle supporting surface 313. The blowing port 316 is located on the side with a larger supporting area of the material angle supporting surface 313. By connecting the air inlet nozzle 315 with an external air source, the air flow enters from the air inlet nozzle 315 and blows out from the blowing port 316, blowing one side of the cut material angle, and further causing the material angle to tilt further towards the blanking chute 32 side, so that the material angle can fall towards the blanking chute 32 side more stably.

[0079] Even further, as Figure 3 and Figure 6 , an avoidance part 141 is provided at the position of the upper die intermediate plate 14 in cooperation with the cutting tool assembly 31, an upper cutting angle matching part 151 is provided at the position of the upper die forming plate 15 in cooperation with the cutting tool assembly 31, a lower cutting angle matching part 2111 is provided at the position of the lower die forming plate 211 in cooperation with the cutting tool assembly 31, and a matching part is provided at the position of the lower die intermediate plate 210 in cooperation with the cutting tool assembly 31. Among them, the side surfaces of the avoidance part 141 and the matching part are both set with a gap from the inner side surface of the tool head 314, and the side surfaces of the upper cutting angle matching part 151 and the lower cutting angle matching part 2111 are adapted to the inner side surface of the tool head 314, so that when the tool head 314 moves up and down, the cutting of the material angle is more sufficient.

[0080] During the operation of this embodiment:

[0081] Start the lower ejector cylinder of the hydraulic press to lift the lower die forming plate 211 from the initial position (i.e., the position where the bottom surface of the lower die intermediate plate 210 is attached to the lower die base plate 23) to a position parallel to the material angle supporting surface 313, and place the material plate into the lower die 2. The material plate is located between multiple groups of precise positioning 213. Start the hydraulic press to drive the upper die 1 to move downwards until the upper die forming plate 15 cooperates with the lower die forming plate 211 to press the material plate. Then, the upper die forming plate 15 continues to press downwards, and the lower die forming plate 211 moves downwards synchronously and at the same speed under the drive of the lower ejector cylinder. During the downward movement, the tool head 314 of the cutting tool assembly 31 cooperates with the upper cutting angle matching part 151 to cut off the protruding material angle;

[0082] After the upper die forming plate 15 and the lower die forming plate 211 press the stock plate together, connect to an external air source to supply air to the air inlet nozzle 315. The air flow flows out from the air blowing port 316, blowing the cut stock corner to one side of the blanking chute 32, so that the cut stock corner can conveniently and fully fall into the blanking chute 32.

[0083] After cutting, the upper die forming plate 15 and the lower die forming plate 211 continue to move downward, and cooperate with the stationary forming seat 215 to stretch the stock plate with a variable radius. After stretching to the set depth, the mold is opened, the external air source is disconnected, and the air intake of the chamfering system 3 is stopped. Then the upper die 1 moves upward to reset. The synchronous cylinder ejector rod extends to push the upper die push plate 18 downward, so that the product is separated from the upper die forming plate 15, avoiding the stretched product sticking to the upper die forming plate 15. After the upper die 1 is reset, the lower ejector cylinder of the hydraulic press moves upward, pushing the top plate 26 upward. The top plate 26 drives the lower die forming plate 211 upward to eject the stretched product formed on the forming seat 215, completing the blanking.

[0084] Place the product with a variable radius stretch in another set of molds equipped with shaping templates. Put the product with a variable radius stretch on the forming seat 215. The hydraulic press drives the shaping templates downward to shape the variable radius structure, so that the fillet R of the housing 100 is shaped into the designed size.

[0085] It should be noted that when the top surface of the lower die forming plate 211 is flush with the stock corner support surface 313, the top surface height of the forming seat 215 is lower than the top surface height of the lower die forming plate 211, and the difference in distance is greater than the thickness of the stock plate. Select an appropriate chamfering stroke according to actual requirements.

[0086] Embodiment III

[0087] This embodiment provides a housing processing process, which uses the processing mold in Embodiment II for processing. This process includes the following steps:

[0088] Step 1: Stretching: Start the lower ejector cylinder of the hydraulic press to lift the lower die forming plate 211 to a position parallel to the stock corner support surface 313, and place the stock plate into the lower die 2; Start the hydraulic press to drive the upper die 1 downward until the upper die forming plate 15 and the lower die forming plate 211 press the stock plate together. Then the upper die forming plate 15 continues to press downward, and the lower die forming plate 211 moves downward synchronously and at the same speed under the drive of the lower ejector cylinder. During the downward movement, the cutter head 314 of the cutter assembly 31 cooperates with the upper chamfering mating part 151 to cut off the protruding stock corner.

[0089] After the upper die forming plate 15 and the lower die forming plate 211 press the stock plate together, connect to an external air source to supply air to the air inlet nozzle 315. The air flow flows out from the air blowing port 316, blowing the cut stock corner to one side of the blanking chute 32;

[0090] After chamfering, the upper die forming plate 15 and the lower die forming plate 211 continue to move downward, and cooperate with the stationary forming seat 215 to stretch the material plate with a variable radius. After stretching to the set depth, the mold is opened, the upper die 1 moves upward and resets, the synchronous cylinder ejector rod extends to push the upper die push plate 18 downward, so that the product is separated from the upper die forming plate 15. After the upper die 1 is reset, the lower jack cylinder of the hydraulic press moves upward, pushing the top plate 26 upward. The top plate 26 drives the lower die forming plate 211 upward to eject the stretched product formed on the forming seat 215.

[0091] Step 2, shaping: Place the product after variable radius stretching in another set of molds equipped with shaping templates. Put the product after variable radius stretching on the forming seat 215, and the hydraulic press drives the shaping template to move downward to shape the variable radius structure.

[0092] Step 3, trimming: Cut off the excess material of the shaped product according to the dimensions.

[0093] Step 4, flanging: Flange the product after cutting off the excess material to form a bottom edge structure.

[0094] Step 5, side punching and riveting: Punch holes on the side of the flanged product, and rivet rivets at the set hole positions after punching.

[0095] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, as well as a specific orientation structure and operation. Therefore, it should not be construed as a limitation of the present invention. In addition, "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0096] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0097] The above has described in detail an embodiment of the present invention, but the above content is only a preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the application of the present invention shall still fall within the scope covered by the patent of the present invention.

Claims

1. A housing processing mold, comprising an upper mold (1) and a lower mold (2), characterized in that, An upper die (1) is provided with an upper die forming plate (15) or a sizing template; The upper die forming plate (15) is provided with a variable radius structure corresponding to the forming position of the fillet R in the housing (100). The variable radius structure includes a straight fillet portion (152), a transition fillet area (153), and a variable radius fillet portion (154); The fillet radius of the variable radius fillet portion (154) is greater than the fillet radius of the straight fillet portion (152), and the fillet radius of the straight fillet portion (152) is greater than or equal to twice the radius of the fillet R in the housing (100); The sizing template is provided with a uniform radius structure corresponding to the forming position of the fillet R in the housing (100), and the fillet radius of the uniform radius structure is equal to the radius of the fillet R in the housing (100); A chamfering system (3) is provided on the lower die (2), and the chamfering system (3) chamfers the blank during the stretching process.

2. The housing processing mold according to claim 1, characterized in that The ratio of the fillet radius R2 of the variable radius fillet portion (154) to the overall stretching depth H of the housing (100) is 1:7 - 7.

5.

3. A housing processing mold according to claim 1, characterized in that, The upper die (1) includes an upper die fixing plate (11). A plurality of upper support seats (12) are provided on the bottom surface of the upper die fixing plate (11). The bottom surfaces of the plurality of upper support seats (12) are cooperatively connected with an upper die bottom plate (13). The bottom surface of the upper die bottom plate (13) is connected with an upper die intermediate plate (14), and the upper die forming plate (15) is connected to the bottom of the upper die intermediate plate (14); An upper fitting cavity is formed in the middle of the upper die intermediate plate (14), an upper forming cavity is formed in the middle of the upper die forming plate (15), and an upper die push plate (18) is movably arranged in the upper fitting cavity.

4. A housing processing mold according to claim 3, characterized in that, A plurality of first guide rods (17) are connected to the back surface of the upper die push plate (18). The plurality of first guide rods (17) all extend upward and penetrate through the upper die bottom plate (13). A cylinder is provided at the top of the hydraulic press, and the ejector rod of the cylinder is connected to the upper die push plate (18).

5. A housing processing mold according to claim 1, characterized in that, The lower die (2) includes two symmetrically arranged lower die fixing plates (21). Lower support seats (22) are connected to the tops of the two lower die fixing plates (21). The tops of the two lower support seats (22) are cooperatively connected with a lower die bottom plate (23); A top plate (26) is provided at the bottom of the lower die bottom plate (23). A plurality of second guide rods (27) are provided on the top surface of the top plate (26). The other ends of the plurality of second guide rods (27) penetrate through the lower die bottom plate (23) and are connected to a lower die intermediate plate (210). The lower die intermediate plate (210) is connected to a lower die forming plate (211) at the top; A lower fitting cavity is formed in the middle of the lower die intermediate plate (210), a lower forming cavity is formed in the middle of the lower die forming plate (211), a forming seat (215) is arranged in the lower fitting cavity, a fixing plate (216) is connected to the bottom of the forming seat (215), and a plurality of connecting seats (217) are provided at the bottom of the fixing plate (216). The bottom surfaces of the plurality of connecting seats (217) are cooperatively connected to the lower die bottom plate (23).

6. The housing processing die according to claim 5, characterized in that, The chamfering system (3) includes cutting tool assemblies (31) provided at four corners of the blanking plate corresponding to the lower die bottom plate (23), and blanking grooves (32) opened at corresponding positions of the lower die bottom plate (23). Each group of the cutting tool assemblies (31) is arranged corresponding to each of the blanking grooves (32).

7. A housing processing mold according to claim 6, characterized in that, The cutting tool assembly (31) includes a blanking base (311). A material guiding inclined surface (312) is provided on the outer side of the top of the blanking base (311). A tool head (314) is provided on the inner side of the top of the blanking base (311). A material corner supporting surface (313) is provided on the top of the blanking base (311), and the material corner supporting surface (313) is flush with the top surface of the tool head (314).

8. A housing processing mold according to claim 7, characterized in that, The material guiding inclined surface (312) longitudinally inclines downward from the upper end of the blanking base (311), and the inclined direction is outward; The material guiding inclined surface (312) transversely inclines from the side close to the mounting seat (24) to the side away from the mounting seat (24), and the inclined direction is inward.

9. A housing processing mold according to claim 7, characterized in that, A main air passage (317) and an air outlet passage (318) are opened in the blanking base (311). An air inlet nozzle (315) is provided on one side of the main air passage (317), and the other side is blocked by a sealing plug. An air blowing port (316) is provided on the air outlet passage (318) through the material corner supporting surface (313).

10. A housing processing technology, characterized in that, Using the processing die according to any one of claims 1-9, includes the following steps: Step 1. Stretching: Start the lower jacking cylinder of the hydraulic press to jack up the lower die forming plate (211) to a position parallel to the material corner supporting surface (313). Place the blanking plate into the lower die (2). Start the hydraulic press to drive the upper die (1) to move downward until the upper die forming plate (15) cooperates with the lower die forming plate (211) to press the blanking plate. Then, the upper die forming plate (15) continues to press down, and the lower die forming plate (211) synchronously and at the same speed moves downward under the drive of the lower jacking cylinder. During the downward movement, the tool head (314) of the cutting tool assembly (31) cooperates with the upper chamfering mating part (151) to cut off the protruding material corner; After the upper die forming plate (15) cooperates with the lower die forming plate (211) to press the blanking plate, connect an external air source to supply air to the air inlet nozzle (315), and the air flow flows out from the air blowing port (316) to blow the cut-off material corner to one side of the blanking groove (32); After chamfering, the upper die forming plate (15) and the lower die forming plate (211) continue to move downward, and cooperate with the stationary forming seat (215) to perform variable radius stretching on the blanking plate. After stretching to the set depth, open the die, the upper die (1) moves upward to reset, the synchronous cylinder ejector rod extends to push the upper die push plate (18) downward to separate the product from the upper die forming plate (15). After the upper die (1) resets, the lower jacking cylinder of the hydraulic press jacks up to drive the top plate (26) to move upward, and the top plate (26) drives the lower die forming plate (211) to move upward to eject the stretched product formed on the forming seat (215); Step 2. Shaping: Place the product after variable radius stretching in another die equipped with shaping templates. Then, put the product after variable radius stretching on the forming seat (215), and the hydraulic press drives the shaping templates to move downward to shape the variable radius structure; Step 3. Trimming: Cut off the excess material from the shaped product according to the dimensions. Step 4. Flanging: Flange the product after cutting off the excess material to form a bottom edge structure. Step 5. Side punching and riveting: Punch holes on the side of the flanged product, and then rivet rivets at the set hole positions after punching.

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