A springback deformation compensation die and method for producing hot-formed parts

Abstract

The present invention is applicable to the technical field of hot forming molds, and provides a rebound deformation compensation mold and method for producing hot forming parts. Two rotating blocks are rotatably installed on the lower mold plate, and the two rotating blocks are both arranged below the support ring. A card interface is provided on the rotating block, and a clamping block is fixedly installed on the rotating block. The rotating block is connected to the lower mold plate through a tension spring. When the support ring descends, the two rotating blocks are driven to rotate, so that the clamping block is used to resist the outer wall of the part to fix it and prevent it from rebounding; two lifting rods are installed at the lower end of the support ring, and two sliding grooves slidably connected to the lifting rods are provided on the lower pad plate, and a telescopic groove is provided at the bottom end of the lifting rod, and a telescopic rod is slidably connected in the telescopic groove. A reset spring is mounted on the outer wall of the telescopic rod, and the reset spring is arranged inside the slide groove. After the support ring is squeezed, the reset spring is compressed, and the reset spring drives the support ring to reset, thereby lifting the part to facilitate its demoulding.

Description

Technical Field

[0001] The invention belongs to the technical field of thermoforming dies, and in particular relates to a springback deformation compensation die and a method thereof for producing thermoforming parts. Background Art

[0002] In the current field of thermoforming mold technology, thermoforming is a manufacturing process in which a plastic sheet is heated to a temperature at which it can be molded, then molded into a specific shape using a mold, and trimmed to create a usable product. The mold used in this process is called a thermoforming mold. When the parts are heated and then bent, stamped, etc., they will rebound due to thermal expansion and contraction, so a rebound deformation compensation mold is required to process them.

[0003] The utility model patent with authorization announcement number CN205587535U discloses a mold based on a rebound angle compensation structure, including a lower die base, a die, a positioning plate, an upper die base, a die handle, a push rod, a guide sleeve, a guide column, a ejector plate, an ejector rod and a punch and other part structures; the upper die base, the pad and the punch fixing plate are provided with threaded holes, stop pin holes and pin holes, the stop pin connects the upper die base and the pad together, and the screws and pins connect the upper die base, the pad and the punch fixing plate together; a die and an ejector plate are provided above the lower die base, and guide columns are also provided at the four corners of the lower die base; springback is the most important defect in the forming process of U-shaped parts. Considering that the generation of springback is due to the recovery of elastic deformation, the utility model adopts the principle of springback angle compensation to construct a new compensation arc during compensation, so as to ensure the dimensional accuracy of the parts, and on this basis, considers the springback angle compensation to design the bottom arc method to eliminate the negative angle of stamping.

[0004] However, the above patent has the following shortcomings:

[0005] 1. The above patent uses the springback angle compensation principle to construct a new compensation arc to ensure the dimensional accuracy of the parts, but it is unable to shape the heated parts, the cooling efficiency of the parts is low, and springback is prone to occur after the parts are removed.

[0006] 2. After the above patent and the commonly used thermoforming molds are processed, the parts are not easy to be taken out from the molds, which reduces the service life of the parts. Summary of the invention

[0007] The present invention provides a springback deformation compensation mold and method for producing hot-formed parts, aiming to solve the problems mentioned in the above background that ordinary molds cannot shape heated parts, the parts cooling efficiency is low, springback is easy to occur after the parts are removed, the parts are not easy to be taken out of the mold, and the service life of the parts is reduced.

[0008] The present invention is achieved by providing a springback deformation compensation die for producing hot-formed parts, comprising an upper die seat;

[0009] A molding assembly, which is used for molding parts, and the molding assembly is installed on the upper mold base;

[0010] A lower die base, the lower die base is arranged below the upper die base, a lower pad is fixedly mounted on the lower die base, and a lower template is fixedly mounted on the lower pad;

[0011] A pressing plate is fixedly mounted on the lower mold plate, and a supporting cylinder is mounted on the pressing plate, which passes through the pressing plate, the lower mold plate, the lower pad and the lower mold seat in sequence;

[0012] A limiting assembly, the limiting assembly comprising a support ring, the support ring being arranged on the outer wall of the support tube and the support ring being slidably connected to the lower template;

[0013] Two rotating blocks are rotatably mounted on the lower template, and the two rotating blocks are both arranged below the supporting ring;

[0014] A card interface is provided on the rotating block, and a clamping block is fixedly installed on the rotating block;

[0015] The rotating block is connected to the lower template via a tension spring.

[0016] Preferably, two lifting rods are installed at the lower end of the support ring, and two sliding grooves slidably connected to the lifting rods are opened on the lower pad; in this solution, the lifting rods can move longitudinally in the sliding grooves, and the sliding grooves limit the moving position of the lifting rods.

[0017] Preferably, a telescopic slot is provided at the bottom end of the lifting rod, and a telescopic rod is slidably connected in the telescopic slot;

[0018] A return spring is mounted on the outer wall of the telescopic rod, and the return spring is arranged inside the slide groove; in this scheme, when the lifting rod descends, the return spring is squeezed, the telescopic rod slides inside the lifting rod, and the telescopic rod can improve the stability of the telescopic rod when it moves longitudinally, and when the support ring lacks pressure, the return spring squeezes the lifting rod, thereby driving the support ring to reset, thereby lifting the parts.

[0019] Preferably, a chip removal groove penetrating the support tube is provided inside the support tube;

[0020] A cooling coil is arranged in the support tube, and a joint connected to the cooling coil is arranged at the lower end of the support tube; in this scheme, the cooling coil is connected to a cooling water source through the joint, and the cooling water is transported to the cooling coil to cool the parts and shape them.

[0021] Preferably, an upper pad is fixedly mounted on the lower surface of the upper die seat, and an upper clamp is fixedly mounted on the lower surface of the upper pad.

[0022] Two positioning pins are installed on the upper clamping plate, and two positioning holes for the positioning pins are provided on the upper surface of the pressing plate; in this scheme, when the upper clamping plate descends, the positioning pins are inserted into the positioning holes to improve the positioning accuracy of the upper clamping plate.

[0023] Preferably, the molding assembly comprises a push rod, and the push rod is slidably connected to the upper mold base;

[0024] A mounting frame is fixedly mounted on the lower end of the push rod, and a convex module which is annular and passes through the upper clamping plate is fixedly mounted on the lower end of the mounting frame, and a conical surface 1 is arranged on the inner wall of the convex module; in this scheme, the push rod drives the mounting frame and the convex module to move longitudinally.

[0025] Preferably, a pressing block is slidably connected inside the male module, and the outer wall of the pressing block is provided with a second conical surface matching the first conical surface;

[0026] An inner release block is slidably mounted in the center of the pressing block, and the push rod is fixedly connected to the inner release block;

[0027] A connecting frame is fixedly installed on the outer wall of the push rod, and the connecting frame is connected to the pressing block through a plurality of connecting springs; in this scheme, the push rod pushes the pressing block through the connecting spring to press the parts, and at the same time, the inner stripping block continues to move with the push rod to cut off excess material.

[0028] The present invention also provides a method for compensating for springback deformation in the production of hot-formed parts, comprising the following steps:

[0029] S1. The heated part is placed on the pressing plate and is stamped and formed by the forming assembly;

[0030] S2. When the part is stamped, the rotating block rotates with it, and the clamping block is used to abut against the outer wall of the part to fix it and prevent it from rebounding;

[0031] S3. The support cylinder contacts the inner wall of the part, and the part is cooled by the cooling coil to improve the cooling efficiency and shape the part;

[0032] S4. The support ring is reset and the part is pushed out of the mold using the support ring.

[0033] Compared with the prior art, the beneficial effects of the present invention are: a springback deformation compensation die and method for producing hot-formed parts of the present invention,

[0034] 1. Two rotating blocks are rotatably installed on the lower template. Both rotating blocks are arranged below the support ring. A card interface is provided on the rotating block, and a clamping block is fixedly installed on the rotating block. The rotating block is connected to the lower template through a tension spring. When the support ring descends, the two rotating blocks are driven to rotate, so that the clamping block is used to contact the outer wall of the part to fix it and prevent it from rebounding;

[0035] 2. A cooling coil is provided in the support tube, and a joint for connecting the cooling coil is provided at the lower end of the support tube. The cooling water source is connected through the joint, and the cooling water is transported to the cooling coil to cool the parts, and the parts are shaped in cooperation with the clamping block;

[0036] 3. Two lifting rods are installed at the lower end of the support ring, and two sliding grooves for slidingly connecting the lifting rods are provided on the lower pad. A telescopic groove is provided at the bottom end of the lifting rod, and a telescopic rod is slidably connected in the telescopic groove. A reset spring is mounted on the outer wall of the telescopic rod. The reset spring is arranged inside the sliding groove. After the support ring is squeezed, the reset spring is compressed, and the reset spring drives the support ring to reset, thereby lifting the part to facilitate its demoulding. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic diagram of the overall structure of the present invention

[0038] Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle

[0039] Figure 3 The structural schematic diagram of the molding component of the present invention is

[0040] Figure 4 The structural diagram of the support ring of the present invention is

[0041] In the figure:

[0042] 1. Upper die seat; 11. Upper pad; 12. Upper clamping plate; 121. Positioning pin;

[0043] 2. Lower die base; 21. Lower pad; 211. Slide; 22. Lower die plate; 23. Pressing plate; 231. Positioning hole; 24. Support cylinder; 241. Chip removal groove; 25. Cooling coil; 251. Joint;

[0044] 3. Molding assembly; 31. Push rod; 311. Mounting frame; 312. Connecting frame; 313. Connecting spring; 32. Male module; 321. Conical surface 1; 33. Press block; 331. Conical surface 2; 34. Internal stripping block;

[0045] 4. Limiting assembly; 41. Support ring; 42. Lifting rod; 421. Telescopic slot; 43. Telescopic rod; 431. Return spring; 44. Rotating block; 441. Card interface; 442. Clamping block; 45. Tension spring. DETAILED DESCRIPTION

[0046] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0047] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0048] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0049] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", 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, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0050] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] See also Figure 1-4 The present invention provides a technical solution: a springback deformation compensation mold for the production of hot formed parts, comprising an upper mold base 1 and a lower mold base 2, the lower mold base 2 is arranged below the upper mold base 1, a lower pad 21 is fixedly installed on the lower mold base 2, a lower mold plate 22 is fixedly installed on the lower pad 21, a pressing plate 23 is fixedly installed on the lower mold plate 22, and a supporting tube 24 is installed on the pressing plate 23, which passes through the pressing plate 23, the lower mold plate 22, the lower pad 21 and the lower mold base 2 in sequence.

[0052] Among them, two guide sleeves are installed on the upper die base 1, and two guide rods slidably connected to the guide sleeves are installed on the lower die base 2, thereby limiting the lifting and lowering position of the upper die base 1, which is convenient for processing parts. At the same time, a spring can be installed on the outer wall of the guide rod to utilize the spring to reduce the vibration of the lower die base 2 and extend the service life of the lower die base 2.

[0053] The limit assembly 4 includes a support ring 41, which is arranged on the outer wall of the support tube 24 and is slidably connected to the lower template 22. Two rotating blocks 44 are rotatably installed on the lower template 22. The two rotating blocks 44 are both arranged below the support ring 41. A card interface 441 is opened on the rotating block 44, and a clamping block 442 is fixedly installed on the rotating block 44. The rotating block 44 is connected to the lower template 22 through a tension spring 45.

[0054] Among them, when the parts are pressed together, the support ring 41 descends, thereby squeezing the card interface 441 on the rotating block 44, thereby driving the rotating block 44 to rotate, so that the clamping block 442 on the rotating block 44 is used to fix the outer wall of the part to shape it and prevent rebound. At the same time, the clamping block 442 can be fixedly connected to the rotating block 44 by bolts. The unused clamping block 442 can be replaced according to different parts, and after the rotating block 44 is not squeezed, the tension spring 45 drives the rotating block 44 to reset.

[0055] Two lifting rods 42 are installed at the lower end of the support ring 41, and two sliding grooves 211 for slidingly connecting the lifting rods 42 are provided on the lower pad 21. A telescopic groove 421 is provided at the bottom end of the lifting rod 42, and a telescopic rod 43 is slidably connected in the telescopic groove 421. A return spring 431 is mounted on the outer wall of the telescopic rod 43, and the return spring 431 is arranged inside the slide groove 211.

[0056] Furthermore, when the support ring 41 descends, the lifting rod 42 follows and descends, causing the telescopic rod 43 to slide inside the lifting rod 42, and the return spring 431 is compressed. At the same time, after the support ring 41 is no longer squeezed, the return spring 431 drives the lifting rod 42 and the support ring 41 to reset, thereby lifting the part and demolding the part.

[0057] A chip removal groove 241 penetrating the support tube 24 is provided inside the support tube 24 , and a cooling coil 25 is provided inside the support tube 24 . A joint 251 connected to the cooling coil 25 is provided at the lower end of the support tube 24 .

[0058] In addition, the connector 251 is connected to a cooling water source to deliver cooling water to the cooling coil 25, thereby cooling the parts and shaping them so that they are less likely to rebound. The chip groove 241 facilitates the removal of excess material during pressing.

[0059] An upper pad 11 is fixedly mounted on the lower surface of the upper die base 1 , an upper clamping plate 12 is fixedly mounted on the lower surface of the upper pad 11 , two positioning pins 121 are mounted on the upper clamping plate 12 , and two positioning holes 231 for the positioning pins 121 are opened on the upper surface of the pressing plate 23 .

[0060] In addition, when the upper die base 1 descends, the two positioning pins 121 are inserted into the corresponding positioning holes 231 , thereby improving the positioning accuracy of the upper clamping plate 12 and the pressing plate 23 .

[0061] The molding component 3 is used for molding parts. The molding component 3 is installed on the upper mold base 1. The molding component 3 includes a push rod 31, which is slidably connected to the upper mold base 1. The lower end of the push rod 31 is fixedly installed with a mounting frame 311, and the lower end of the mounting frame 311 is fixedly installed with a convex module 32 that passes through the upper clamping plate 12 in an annular manner. The inner wall of the convex module 32 is provided with a conical surface 1 321, and a pressure block 33 is slidably connected in the convex module 32. The outer wall of the pressure block 33 is provided with a conical surface 2 331 that matches the conical surface 1 321. An inner stripping block 34 is slidably installed in the center point of the pressure block 33. The push rod 31 is fixedly connected to the inner stripping block 34, and a connecting frame 312 is fixedly installed on the outer wall of the push rod 31. The connecting frame 312 is connected to the pressure block 33 through a plurality of connecting springs 313.

[0062] Specifically, the push rod 31 and the upper die seat 1 are installed on the punching machine. When the push rod 31 descends, it pushes the mounting frame 311 to move longitudinally, and then the parts are pressed together by the pressing block 33. The pressing block 33 moves in the convex module 32, and the convex module 32 squeezes the support ring 41, driving the support ring 41 to descend to form the folding edge. The inner stripping block 34 slides out of the inner hole of the extruded part by the pressing block 33. After the push rod 31 rises, it drives the convex module 32, the pressing block 33 and the inner stripping block 34 to rise.

[0063] The present invention provides a technical solution: a method for compensating for springback deformation in the production of hot-formed parts, comprising the following steps:

[0064] S1. The heated part is placed on the pressing plate 23, and is stamped and formed by the molding assembly 3;

[0065] S2. When the part is stamped, the rotating block 44 follows the rotation, and the clamping block 442 is used to resist the outer wall of the part to fix it to prevent it from rebounding;

[0066] S3. The support cylinder 24 contacts the inner wall of the part, and the part is cooled by the cooling coil 25 to improve the cooling efficiency and shape the part;

[0067] S4. The support ring 41 is reset, and the support ring 41 is used to push the part out of the mold.

[0068] Working principle and use process of the present invention: please refer to Figure 1-4, the part is placed on the pressing plate 23, and the push rod 31 pushes the mounting frame 311 to move longitudinally when it descends, and then the pressing block 33 is used to press the part into place, and the pressing block 33 moves in the convex module 32, and the convex module 32 squeezes the support ring 41, driving the support ring 41 to descend to form the folding edge, and when the part is pressed, the support ring 41 descends, and then squeezes the card interface 441 on the rotating block 44, and then drives the rotating block 44 to rotate, so that the outer wall of the part is fixed by the clamping block 442 on the rotating block 44, and the joint 251 is connected to the cooling water source to transport the cooling water to the cooling coil 25, so as to cool the part, make it fixed and prevent rebound, and after the push rod 31 rises, it drives the convex module 32, the pressing block 33 and the inner stripping block 34 to rise, and after the support ring 41 is not squeezed, the reset spring 431 drives the lifting rod 42 and the support ring 41 to reset, thereby lifting the part and demolding the part.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A springback deformation compensation die for the production of hot-formed parts, characterized in that: It includes an upper die base (1); A molding assembly (3) for molding parts, wherein the molding assembly (3) is mounted on the upper mold base (1); A lower die base (2), the lower die base (2) being arranged below the upper die base (1), a lower pad (21) being fixedly mounted on the lower die base (2), and a lower template (22) being fixedly mounted on the lower pad (21); A material pressing plate (23) is fixedly mounted on the lower mold plate (22), and a support cylinder (24) is mounted on the material pressing plate (23) and passes through the material pressing plate (23), the lower mold plate (22), the lower pad (21) and the lower mold base (2) in sequence; A limiting assembly (4), the limiting assembly (4) comprising a support ring (41), the support ring (41) being arranged on the outer wall of the support tube (24), and the support ring (41) being slidably connected to the lower template (22); Two rotating blocks (44) are rotatably mounted on the lower template (22), and the two rotating blocks (44) are both arranged below the supporting ring (41); The rotating block (44) is provided with a card interface (441), and a clamping block (442) is fixedly mounted on the rotating block (44); The rotating block (44) is connected to the lower template (22) via a tension spring (45).

2. A springback deformation compensation die for producing hot-formed parts according to claim 1, characterized in that: Two lifting rods (42) are installed at the lower end of the support ring (41), and two sliding grooves (211) for slidably connecting the lifting rods (42) are provided on the lower pad (21).

3. A springback deformation compensation die for thermoforming parts production as claimed in claim 2, characterized in that: A telescopic slot (421) is provided at the bottom end of the lifting rod (42), and a telescopic rod (43) is slidably connected in the telescopic slot (421); A return spring (431) is sleeved on the outer wall of the telescopic rod (43), and the return spring (431) is arranged inside the sliding groove (211).

4. A springback deformation compensation die for thermoforming parts production as claimed in claim 1, characterized in that: The support tube (24) is provided with a chip removal groove (241) penetrating the support tube (24); A cooling coil (25) is arranged in the support tube (24), and a joint (251) connected to the cooling coil (25) is arranged at the lower end of the support tube (24).

5. The springback deformation compensation die for thermoforming parts production according to claim 1, characterized in that: An upper pad (11) is fixedly mounted on the lower surface of the upper die seat (1), and an upper clamping plate (12) is fixedly mounted on the lower surface of the upper pad (11). Two positioning pins (121) are installed on the upper clamping plate (12), and two positioning holes (231) corresponding to the positioning pins (121) are opened on the upper surface of the pressing plate (23).

6. A springback deformation compensation die for producing hot-formed parts according to claim 5, characterized in that: The molding assembly (3) comprises a push rod (31), and the push rod (31) is slidably connected to the upper mold base (1); A mounting frame (311) is fixedly mounted on the lower end of the push rod (31), and a convex module (32) which is annular and passes through the upper clamping plate (12) is fixedly mounted on the lower end of the mounting frame (311), and a conical surface (321) is provided on the inner wall of the convex module (32).

7. A springback deformation compensation die for producing hot-formed parts according to claim 6, characterized in that: A pressing block (33) is slidably connected inside the male module (32), and an outer wall of the pressing block (33) is provided with a second conical surface (331) matching the first conical surface (321); An inner disengagement block (34) is slidably mounted in the center of the pressing block (33), and the push rod (31) is fixedly connected to the inner disengagement block (34); A connecting frame (312) is fixedly mounted on the outer wall of the push rod (31), and the connecting frame (312) is connected to the pressing block (33) via a plurality of connecting springs (313).

8. A method for compensating for springback deformation in the production of hot-formed parts according to any one of claims 1 to 7, comprising the following steps: S1. The heated part is placed on the pressing plate (23), and the forming assembly (3) performs stamping and forming on the part; S2. When the part is stamped, the rotating block (44) rotates accordingly, and the clamping block (44) is used to abut against the outer wall of the part to fix it and prevent it from rebounding; S3. The support cylinder (24) contacts the inner wall of the part, and the part is cooled by the cooling coil (25), thereby improving the cooling efficiency and shaping the part; S4. The support ring (41) is reset, and the support ring (41) is used to push the part out of the mold.

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