Automobile rear protection plate stamping die with replaceable die head and process

Abstract

The invention discloses an automobile rear protection plate stamping die with a replaceable die head and a process, and belongs to the technical field of automobile protection plate stamping. A mounting seat, a cross-shaped sliding rod, a fixed spring, a stamping plate, an upper die and a lower die are arranged, and the cross-shaped sliding rod is clamped into a corresponding L-shaped clamping groove; the cross-shaped sliding rod is loosened and slides in the L-shaped clamping groove under the springback effect of the fixing spring, so that the fixing base is clamped and fixed in the mounting groove, meanwhile, the lower die is clamped and fixed in the mounting groove, the stamping plate is controlled to be tightly attached to the top of the upper die, and the fixing clamping groove corresponds to the fixing bolt in position; the fixing bolts are rotated to be clamped into the fixing clamping grooves, the fixing nuts are tightened to clamp and fix the fixing bolts into the fixing clamping grooves, and the upper die is connected and fixed to the bottom of the stamping plate, so that the upper die and the lower die can be conveniently disassembled, overhauled or fixedly installed, and meanwhile it is ensured that the upper die and the lower die cannot be dislocated or deviated during installation.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile guard plate stamping, and in particular relates to an automobile rear guard plate stamping die with a replaceable die head and a process. Background Art

[0002] As an important component of the automobile body, the rear guard plate of a car is fixedly installed at the rear of the car to protect the car body. When a collision occurs at the rear of the car, it absorbs the impact force and reduces the injury of the passengers. The processing of the rear guard plate of a car requires multiple processing steps such as material selection, cutting, stamping, welding and surface treatment. Among them, stamping is an important step in the processing of the rear guard plate of a car. The cut plate is stamped into shape to obtain the rear guard plate of the car with the required contour and curvature. After a long period of use, the stamping die will have problems such as wear, deformation, and damage. Continuing to use it is easy to cause jamming during the stamping process, making the opening and closing of the die not smooth, thereby affecting production efficiency. At the same time, the damaged die may crack or break, and fragments may fly during the stamping process, posing a threat to the safety of the operator.

[0003] When the existing automobile rear guard plate stamping die is performing stamping processing, the upper die and the lower die generally need to be fixed with multiple bolts. It takes a long time to tighten the multiple bolts to fix the upper die and the lower die, which affects the efficiency of the stamping process. At the same time, the bolts are prone to rust and difficult to tighten after long-term use, making it difficult to disassemble, repair and replace the upper die and the lower die. Therefore, improvement is needed. Summary of the invention

[0004] In order to overcome the above-mentioned defects, the present invention provides a car rear guard plate stamping die and process with a replaceable die head, which solves the problem that the upper die and the lower die of the existing car rear guard plate stamping die generally need to be fixed with multiple bolts during stamping processing. It takes a long time to screw the multiple bolts to fix the upper die and the lower die, which affects the efficiency of the stamping processing. At the same time, the bolts are prone to rust after long-term use and are difficult to screw, resulting in difficulty in disassembling, repairing and replacing the upper die and the lower die.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a stamping die for a rear guard plate of an automobile with a replaceable die head, comprising a mounting frame, a mounting seat is fixedly installed at the bottom of one side of the mounting frame, a lower die is slidably installed on the top of the mounting seat, a fixed seat is fixedly installed on one side of the lower die, and a plurality of groups of limiting rollers are fixedly installed on both sides of the lower die and the fixed seat, a punching machine body is fixedly installed on the top of one side of the mounting frame, and the positions of the punching machine body and the mounting seat correspond, an upper die is provided at the bottom of the punching machine body, and the positions of the upper die and the lower die correspond, and limiting frames are symmetrically provided on both sides of the lower die and the upper die.

[0006] As a further solution of the present invention: a mounting groove is provided on the top of the mounting seat, an L-shaped slot is symmetrically provided on one side of the bottom of the mounting groove, limiting slide grooves are symmetrically provided on both sides of the inner wall of the mounting groove, and a limiting roller is slidably connected to the inside of the limiting slide groove.

[0007] As a further solution of the present invention: a punching rod is provided at the central position of the bottom of the punching machine body, and limiting slide bars are respectively provided at the four corners of the bottom of the punching machine body. A punching plate is fixedly installed at the bottom ends of the punching rod and the four groups of limiting slide bars, and the positions of the punching plate and the installation groove correspond to each other. Fixed card grooves are respectively provided at the central positions of both sides of the punching plate.

[0008] As a further solution of the present invention: a rotating seat is rotatably installed at the central position of both sides of the upper mold, a fixing bolt is fixedly installed on the top of the rotating seat, and the position of the fixing bolt corresponds to the position of the limiting slide groove, a fixing nut is provided at the bottom of the surface of the fixing bolt, and a punch is fixedly installed at the bottom of the upper mold.

[0009] As a further solution of the present invention: a concave mold is provided on the top of the lower mold, the position of the concave mold and the punch mold correspond and have the same shape, a return groove is provided at the bottom of the concave mold, and a lifting frame is provided inside the concave mold, and the position of the lifting frame and the return groove correspond and have the same shape.

[0010] As a further solution of the present invention: push rods are fixedly installed at the four corners of the bottom of the lifting frame, and the push rods are slidably connected to the bottom of the return groove. A limiting plate is fixedly installed on the surface of the push rod at the bottom of the return groove, and a lifting spring is provided on the surface of the push rod at the bottom of the limiting plate.

[0011] As a further solution of the present invention: installation grooves are respectively provided at both ends of the fixed seat, and a limit plate 2 is slidably installed at one end inside the installation groove, a cross slide bar is fixedly installed on one side of the limit plate 2, and the end of the cross slide bar away from the limit plate 2 passes through the installation groove and extends to the outside of the fixed seat corresponding to the position of the L-shaped slot, a fixing spring is provided on the surface of the cross slide bar located inside the installation groove, and fixed clamping plates are symmetrically installed on both ends of the top of the fixed seat, and fixed clamping holes are provided on the surface of the fixed clamping plates, and the fixed clamping holes correspond to the position of the cross slide bar.

[0012] As a further solution of the present invention: the limit frame includes two groups of fixed protrusions, and the surfaces of the two groups of fixed protrusions are rotatably mounted with a rotating frame 1 and a rotating frame 2 respectively, and the rotating frame 1 is rotatably connected with one end of the rotating frame 2 away from the fixed protrusions.

[0013] A process for stamping a rear guard plate of an automobile with a replaceable die head, the process comprising the following steps:

[0014] When the rear guard plate of the automobile is being stamped, the main body of the stamping machine is controlled to extend and retract to drive the stamping rod to rise and fall, so that the stamping plate drives the upper mold to approach or move away from the lower mold, and the plate placed on the top of the lower mold is stamped. The lower mold and the upper mold that are impacted by stamping for a long time are prone to wear and deformation, which will affect the stamping of the rear guard plate of the automobile. The lower mold and the upper mold need to be disassembled, repaired and replaced regularly, and the main body of the stamping machine is controlled to extend to drive the stamping rod to move down until the lower mold and the upper mold are close to each other, loosen the fixing nut, turn the fixing bolts to both sides, and turn the fixing bolts out of the corresponding fixed card slots. Then, the main body of the stamping machine is controlled to contract to drive the stamping rod to move up and drive the stamping plate to separate from the top of the upper mold, turn the fixed card plate to separate from the cross slide bar, push and squeeze the two groups of cross slide bars to approach each other, so that the bottom end of the cross slide bar is close inside the L-shaped card slot, and the lower mold and the fixing seat are pulled out from the inside of the installation slot. At the same time, the upper mold is stuck on the top of the lower mold and is pulled out of the installation slot at the same time;

[0015] Select a new set of lower mold and upper mold and place them on one side of the installation slot, so that the limit roller corresponds to the limit slide slot, push the fixed seat to insert the lower mold into the installation slot, and squeeze the two sets of cross slide bars until the cross slide bars are stuck in the corresponding L-shaped slots. After the lower mold and the upper mold move to the bottom of the stamping plate, release the cross slide bar and reset the cross slide bar under the rebound action of the fixed spring to fix it in the L-shaped slot. At the same time, turn the fixed card plate to make the fixed card hole stuck at the top of the cross slide bar, clamp and fix the cross slide bar, clamp and fix the lower mold and the fixed seat in the installation slot, control the main body of the punching machine to extend so that the punching plate is close to the top of the upper mold, and turn the fixing screw The bolt is inserted into the corresponding fixed slot, and the fixing nut is tightened to clamp and fix the fixing bolt in the fixed slot, so as to connect and fix the upper mold and the stamping plate, and the main body of the stamping machine is controlled to shrink so that the stamping plate drives the upper mold to move up and away from the lower mold, and the cut sheet is placed on the top of the lower mold, and the upper mold is controlled to press down until the punch presses the sheet into the die to stamp the sheet. At the same time, the sheet is pressed into the die to squeeze the lifting frame downward, so that the limit plate squeezes the lifting spring and deforms. When the upper mold moves up to separate the punch from the die, the lifting spring rebounds to lift the lifting frame, so that the formed sheet is ejected out of the die, which is convenient for taking the formed sheet.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. In the present invention, a mounting seat, a cross slide bar, a fixing spring, a stamping plate, an upper mold and a lower mold are provided, and the lower mold is inserted into the mounting seat, so that the upper mold which is close to the top of the lower mold moves to a position corresponding to the stamping plate, and at the same time, the two groups of cross slide bars are pushed and squeezed to approach each other, and the fixing spring is squeezed and deformed, until the cross slide bar is clamped into the corresponding L-shaped groove, and the cross slide bar is released. Under the rebound action of the fixing spring, the cross slide bar slides in the L-shaped groove, so that the fixing seat is clamped and fixed in the mounting groove, and the lower mold is clamped and fixed in the mounting groove, and the stamping plate is controlled to be close to the top of the upper mold, so that the fixing groove corresponds to the position of the fixing bolt, the fixing bolt is rotated to be clamped into the fixing groove, and the fixing nut is tightened to clamp and fix the fixing bolt in the fixing groove, and the upper mold is connected and fixed to the bottom of the stamping plate, so that it is convenient to disassemble, inspect or install the upper mold and the lower mold, and at the same time, it is ensured that the upper mold and the lower mold will not be dislocated or offset during installation.

[0018] 2. In the present invention, by setting a die, a lifting frame, a lifting spring and a punch, the main body of the stamping machine controls the stamping plate to drive the upper die to move upward, so that when the punch is separated from the die, the top of the plate formed inside the die is no longer under pressure, so that the pressure on the top of the lifting frame is reduced, and the lifting spring rebounds at the bottom of the limit plate 1, lifting the limit plate 1 and the ejector rod, so that the lifting frame moves upward inside the die to separate from the return groove, and lifts the formed plate to separate from the die, so as to facilitate the removal of the stamped plate and replace it with an unprocessed plate for repeated stamping and forming. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the explosion structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the structure of the mounting frame, the mounting seat and the punching machine body of the present invention;

[0021] Figure 3 It is a cross-sectional structural schematic diagram of the lower mold and the fixing seat of the present invention;

[0022] Figure 4 For the present invention Figure 3 A schematic diagram of the enlarged structure at A in the middle;

[0023] Figure 5 For the present invention Figure 3 A schematic diagram of the enlarged structure at B in the middle;

[0024] Figure 6 It is a structural schematic diagram of the upper mold of the present invention;

[0025] Figure 7 It is a structural schematic diagram of the limiting frame of the present invention;

[0026] In the figure: 1, mounting frame; 2, mounting seat; 201, mounting slot; 202, L-shaped slot; 203, limit slide slot; 3, punching machine body; 301, punching rod; 302, limit slide rod; 303, punching plate; 304, fixed slot; 4, lower mold; 401, concave mold; 402, return groove; 403, lifting frame; 404, ejector; 405, limit plate 1; 406, lifting spring; 5 , fixed seat; 501, mounting slide; 502, limit plate 2; 503, cross slide bar; 504, fixed spring; 505, fixed clamping plate; 506, fixed clamping hole; 6, upper mold; 601, rotating seat; 602, fixing bolt; 603, fixing nut; 604, punch; 7, limit frame; 701, fixed protrusion; 702, rotating frame 1; 703, rotating frame 2; 8, limit roller. DETAILED DESCRIPTION

[0027] The technical solution of the present application is further described in detail below in conjunction with specific implementation methods.

[0028] like Figure 1-7 As shown, the present invention provides a technical solution: a stamping die for a rear guard plate of an automobile with a replaceable die head, comprising a mounting frame 1, a mounting seat 2 is fixedly installed at the bottom of one side of the mounting frame 1, a lower die 4 is slidably installed on the top of the mounting seat 2, and a fixing seat 5 is fixedly installed on one side of the lower die 4; a punching machine body 3 is fixedly installed on the top of one side of the mounting frame 1, and the position of the punching machine body 3 corresponds to that of the mounting seat 2. By providing the mounting seat 2, the lower die 4 and the fixing seat 5 are fixed on the top of the mounting seat 2 to ensure that the lower die 4 does not directly contact the ground; multiple groups of limiting rollers 8 are fixedly installed on both sides of the lower die 4 and the fixing seat 5, and limiting slide grooves 203 are symmetrically provided on both sides of the inner wall of the mounting groove 201, and the limiting rollers 8 are slidably connected to the inside of the limiting slide groove 203. Due to the provision of the limiting rollers 8, when the lower die 4 and the fixing seat 5 are inserted into the inside of the mounting groove 201, the limiting rollers 8 roll inside the limiting slide groove 203, thereby reducing the friction of the lower die 4 and the fixing seat 5 when they move inside the mounting groove 201.

[0029] A die 401 is provided on the top of the lower mold 4, and the position of the die 401 and the punch 604 correspond to each other and have the same shape. A return groove 402 is provided at the bottom of the die 401, and a lift frame 403 is provided inside the die 401. The lift frame 403 and the return groove 402 correspond to each other in position and have the same shape, and the lift frame 403 is in the return groove 402. Because of the return groove 402 and the lift frame 403, when the punch 604 is pressed into the die 401, the punch 604 squeezes the lift frame 403 and snaps it into the return groove 402, so as to avoid the lift frame 403 leaving an indentation on the surface of the sheet when the punch 604 is stamping the sheet.

[0030] A push rod 404 is fixedly installed at the four corners of the bottom of the lifting frame 403, and the push rod 404 is slidably inserted and connected in the bottom hole of the return groove 402. A limit plate 405 is fixedly installed on the surface of the push rod 404 at the bottom of the return groove 402. A lifting spring 406 is provided on the surface of the push rod 404 at the bottom of the limit plate 405. The limit plate 405 and the spring 406 are matched and placed in a mounting slide hole with a slightly larger diameter in the hole. By providing a push spring 406, the limit plate 405 is lifted up under the elastic force of the push spring 406, driving the push rod 404 to move upward, and the lifting frame 403 is pushed out of the return groove 402, thereby ejecting the sheet material formed in the die 401, making it convenient to take out the stamped sheet material.

[0031] The two ends of the fixed seat 5 are respectively provided with mounting grooves 501, and one end of the mounting groove 501 is slidably installed with a second limiting plate 502, and a cross slide bar 503 is fixedly installed on one side of the second limiting plate 502, and the top of the cross slide bar 503 away from the second limiting plate 502 passes through the slide hole at the top of the mounting groove 501 to extend to the outside of the fixed seat 5, and the bottom of the cross slide bar 503 away from the second limiting plate 502 passes through the slide hole at the bottom of the mounting groove 501 to extend to the outside of the fixed seat 5 and corresponds to the position of the L-shaped slot 202. A fixing spring 504 is provided on the surface of the cross slide bar 503 located inside the mounting groove 501, a mounting groove 201 is provided on the top of the mounting seat 2, and an L-shaped groove 202 is symmetrically provided on one side of the bottom of the mounting groove 201. After the cross slide bar 503 is inserted into the corresponding L-shaped groove 202, the limiting plate 2 502 is pushed toward one end of the mounting groove 501 under the rebound action of the fixing spring 504, so that the cross slide bar 503 is clamped and fixed in the L-shaped groove 202, thereby clamping and fixing the fixing seat 5 in the mounting groove 201.

[0032] The two ends of the top of the fixed seat 5 are symmetrically hingedly installed with fixed clamping plates 505, and the surface of the fixed clamping plates 505 is provided with fixed clamping holes 506, and the fixed clamping holes 506 correspond to the positions of the cross slide bar 503. The fixed clamping plates 505 can be rotated and laid flat on the top surface of the fixed seat 5. The fixed clamping plates 505 are rotated to make the fixed clamping holes 506 clamp on the end surface of the cross slide bar 503 extending from the top slide hole of the installation slide groove 501, and the cross slide bar 503 is clamped and fixed to ensure that the cross slide bar 503 will not slide freely inside the installation slide groove 501, thereby preventing the cross slide bar 503 from sliding out of the L-shaped clamping groove 202.

[0033] A punching rod 301 is provided at the central position of the bottom of the punching machine body 3, and limiting slide bars 302 are respectively provided at the four corners of the bottom of the punching machine body 3. A punching plate 303 is fixedly installed at the bottom of the punching rod 301 and the four groups of limiting slide bars 302 so that the lower mold 4 can be stably placed on the bottom of the punching plate 303, and the position of the punching plate 303 corresponds to the position of the mounting groove 201. Fixed card grooves 304 are respectively provided at the central positions on both sides of the punching plate 303. Because the punching rod 301 and the limiting slide bar 302 are provided, the punching machine body 3 controls the extension and retraction of the punching rod 301, so that the punching plate 303 drives the limiting slide bar 302 to extend and retract and slide at the bottom of the punching machine body 3, thereby ensuring that the punching plate 303 drives the upper mold 6 to move up and down on the top of the lower mold 4 without misalignment or offset.

[0034] An upper mold 6 is provided at the bottom of the punching machine body 3, and the position of the upper mold 6 corresponds to that of the lower mold 4. Rotating seats 601 are rotatably installed at the central positions on both sides of the upper mold 6, and fixing bolts 602 are fixedly installed on the top of the rotating seat 601, and the fixing bolts 602 correspond to the positions of the fixed slots 304. After the stamping plate 303 is tightly attached to the upper mold 6, the fixed slots 304 on both sides of the stamping plate 303 correspond to the positions of the rotating seats 601 on both sides of the upper mold 6. When the rotating seat 601 is controlled to rotate, the fixing bolts 602 will rotate and snap into the inside of the fixing slots 304, so that the upper mold 6 will not be misplaced when fixed to the bottom of the stamping plate 303. A fixing nut 603 is provided at the bottom of the surface of the fixing bolt 602; a punch 604 is fixedly installed at the bottom of the upper mold 6. By providing a fixing bolt 602, when the stamping plate 303 is pressed against the top of the upper mold 6, the fixing bolt 602 is rotated to fit into the corresponding fixing slot 304, and the fixing nut 603 is tightened to press against the top of the stamping plate 303, thereby fixing the upper mold 6 to the bottom of the stamping plate 303.

[0035] The lower mold 4 and the upper mold 6 are symmetrically provided with limit frames 7 on both sides. The limit frames 7 include two groups of fixed protrusions 701, and the surfaces of the two groups of fixed protrusions 701 are rotatably mounted with a rotating frame 1 702 and a rotating frame 2 703, respectively. The rotating frame 1 702 is rotatably connected with one end of the rotating frame 2 703 away from the fixed protrusion 701. Because the rotating frame 1 702 and the rotating frame 2 703 are provided, when the upper mold 6 is controlled to move up and down on the top of the lower mold 4, the rotating frame 1 702 and the rotating frame 2 703 rotate, thereby limiting the distance between the upper mold 6 and the lower mold 4.

[0036] The process of stamping die for automobile rear guard plate with replaceable die head includes the following steps:

[0037] When the rear guard plate of the automobile is being stamped, the main body 3 of the stamping machine is controlled to extend and retract to drive the stamping rod 301 to move up and down, so that the stamping plate 303 drives the upper mold 6 to approach or move away from the lower mold 4, and the plate placed on the top of the lower mold 4 is stamped. The lower mold 4 and the upper mold 6 that are impacted by stamping for a long time are prone to wear and deformation, which will affect the stamping of the rear guard plate of the automobile. The lower mold 4 and the upper mold 6 need to be disassembled, repaired and replaced regularly. The main body 3 of the stamping machine is controlled to extend so that the stamping rod 301 drives the stamping plate 303 to move downward until the lower mold 4 and the upper mold 6 are close to each other, and the fixing nut 6 is loosened. 03, rotate the fixing bolts 602 to both sides, after the fixing bolts 602 are rotated out from the corresponding fixed card slots 304, control the main body 3 of the punching machine to contract so that the punching rod 301 drives the punching plate 303 to move upward, drives the punching plate 303 to separate from the top of the upper mold 6, rotates the fixed card plate 505 to separate from the cross slide bar 503, pushes and squeezes the two groups of cross slide bars 503 to approach each other, makes the bottom ends of the cross slide bars 503 close to each other in the L-shaped card slot 202, pulls the lower mold 4 and the fixing seat 5 out of the installation slot 201, and at the same time, the upper mold 6 is stuck on the top of the lower mold 4 and is pulled out of the installation slot 201;

[0038] Select a new set of lower mold 4 and upper mold 6 to be placed on one side of the installation groove 201, so that the limiting roller 8 corresponds to the limiting slide groove 203, push the fixed seat 5 to insert the lower mold 4 into the installation groove 201, and at the same time squeeze the two sets of cross slide bars 503 until the cross slide bar 503 is stuck in the corresponding L-shaped slot 202. After the lower mold 4 and the upper mold 6 move to the bottom of the stamping plate 303, release the cross slide bar 503. Under the rebound action of the fixing spring 504, the cross slide bar 503 is reset and clamped in the L-shaped slot 202. At the same time, rotate the fixed card plate 505 so that the fixed card hole 506 is stuck in the top of the cross slide bar 503, clamp and fix the cross slide bar 503, clamp and fix the lower mold 4 and the fixed seat 5 in the installation groove 201, control the punching machine body 3 to extend so that the stamping plate 303 is close to the top of the upper mold 6, and turn the fixing screw The bolt 602 is inserted into the corresponding fixed slot 304, and the fixing nut 603 is tightened to clamp and fix the fixing bolt 602 into the fixed slot 304, so that the upper mold 6 is connected and fixed to the stamping plate 303, and the stamping machine body 3 is controlled to shrink so that the stamping plate 303 drives the upper mold 6 to move up and away from the lower mold 4, and the cut sheet is placed on the top of the lower mold 4, and the upper mold 6 is controlled to press down until the punch 604 presses the sheet into the inside of the die 401 to stamp the sheet. At the same time, the sheet is pressed into the inside of the die 401 to squeeze the lifting frame 403 downward, so that the limit plate 405 squeezes the lifting spring 406 to deform. When the upper mold 6 moves up to make the punch 604 separate from the inside of the die 401, the lifting spring 406 rebounds to lift the lifting frame 403, so that the formed sheet is ejected out of the die 401, which is convenient for taking the formed sheet.

[0039] In the description of the present invention, it is necessary to understand that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present invention, unless otherwise clearly specified and limited, the first feature "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one scheme", "some schemes", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the scheme or example are included in at least one scheme or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same scheme or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more schemes or examples in a suitable manner.

Claims

1. A stamping die for a rear guard plate of an automobile with a replaceable die head, comprising a mounting frame (1), characterized in that: A mounting seat (2) is fixedly mounted at the bottom of one side of the mounting frame (1), a lower mold (4) is slidably mounted on the top of the mounting seat (2), a fixed seat (5) is fixedly mounted on one side of the lower mold (4), and a plurality of groups of limiting rollers (8) are fixedly mounted on both sides of the lower mold (4) and the fixed seat (5), a punching machine body (3) is fixedly mounted on the top of one side of the mounting frame (1), and the positions of the punching machine body (3) and the mounting seat (2) correspond, an upper mold (6) is arranged at the bottom of the punching machine body (3), and the positions of the upper mold (6) and the lower mold (4) correspond, and limiting frames (7) are symmetrically arranged on both sides of the lower mold (4) and the upper mold (6).

2. The automobile rear guard plate stamping die with replaceable die head according to claim 1, characterized in that: The top of the mounting seat (2) is provided with a mounting groove (201), one side of the bottom of the mounting groove (201) is symmetrically provided with an L-shaped slot (202), both sides of the inner wall of the mounting groove (201) are symmetrically provided with limiting sliding grooves (203), and the limiting roller (8) is slidably connected to the inside of the limiting sliding groove (203).

3. The automobile rear guard plate stamping die with replaceable die head according to claim 2, characterized in that: A punching rod (301) is provided at the central position of the bottom of the punching machine body (3), and limiting slide bars (302) are respectively provided at the four corners of the bottom of the punching machine body (3). A punching plate (303) is fixedly installed at the bottom ends of the punching rod (301) and the four groups of limiting slide bars (302), and the positions of the punching plate (303) and the mounting groove (201) correspond to each other. Fixed slots (304) are respectively provided at the central positions of both sides of the punching plate (303).

4. The automobile rear guard plate stamping die with replaceable die head according to claim 2, characterized in that: A rotating seat (601) is rotatably mounted at the central position on both sides of the upper mold (6), a fixing bolt (602) is fixedly mounted on the top of the rotating seat (601), and the position of the fixing bolt (602) corresponds to the position of the limiting slide groove (203), a fixing nut (603) is provided at the bottom of the surface of the fixing bolt (602), and a punch (604) is fixedly mounted at the bottom of the upper mold (6).

5. The automobile rear guard plate stamping die with replaceable die head according to claim 4, characterized in that: A concave mold (401) is provided at the top of the lower mold (4), the concave mold (401) and the convex mold (604) are in corresponding positions and have the same shape, a return groove (402) is provided at the bottom of the concave mold (401), and a lifting frame (403) is provided inside the concave mold (401), and the lifting frame (403) and the return groove (402) are in corresponding positions and have the same shape.

6. The automobile rear guard plate stamping die with replaceable die head according to claim 5, characterized in that: A push rod (404) is fixedly installed at the four corners of the bottom of the lifting frame (403), and the push rod (404) is slidably connected to the bottom of the return groove (402). A limit plate (405) is fixedly installed on the surface of the push rod (404) located at the bottom of the return groove (402), and a lifting spring (406) is provided on the surface of the push rod (404) located at the bottom of the limit plate (405).

7. The automobile rear guard plate stamping die with replaceable die head according to claim 2, characterized in that: The two ends of the fixed seat (5) are respectively provided with mounting grooves (501), one end of the interior of the mounting groove (501) is slidably installed with a second limiting plate (502), one side of the second limiting plate (502) is fixedly installed with a cross slide bar (503), and the end of the cross slide bar (503) away from the second limiting plate (502) passes through the mounting groove (501) and extends to the outside of the fixed seat (5) corresponding to the position of the L-shaped groove (202), the surface of the cross slide bar (503) located inside the mounting groove (501) is provided with a fixing spring (504), and the two ends of the top of the fixed seat (5) are symmetrically rotatably installed with a fixing card plate (505), and the surface of the fixing card plate (505) is provided with a fixing card hole (506), and the fixing card hole (506) corresponds to the position of the cross slide bar (503).

8. The automobile rear guard plate stamping die with replaceable die head according to claim 1, characterized in that: The limiting frame (7) comprises two groups of fixed protrusions (701), and a rotating frame 1 (702) and a rotating frame 2 (703) are rotatably mounted on the surfaces of the two groups of fixed protrusions (701), respectively. The rotating frame 1 (702) and the rotating frame 2 (703) are rotatably connected at one end away from the fixed protrusions (701).

9. A process for a stamping die for a rear guard plate of an automobile with a replaceable die head, according to any one of claims 1 to 8, characterized in that: The process comprises the following steps: When the rear protection plate of the automobile is being stamped, the main body (3) of the stamping machine is controlled to extend and retract to drive the stamping rod (301) to move up and down, so that the stamping plate (303) drives the upper mold (6) to approach or move away from the lower mold (4), and the plate placed on the top of the lower mold (4) is stamped. The lower mold (4) and the upper mold (6) are easily worn and deformed due to long-term stamping and impact, which will affect the stamping of the rear protection plate of the automobile. The lower mold (4) and the upper mold (6) need to be disassembled, repaired and replaced regularly. The main body (3) of the stamping machine is controlled to extend to drive the stamping rod (301) to move the stamping plate (303) downward until the lower mold (4) and the upper mold (6) are close to each other, and the fixing nut (603) is loosened. The fixing bolts (602) are rotated to both sides, and after the fixing bolts (602) are rotated out from the corresponding fixing slots (304), the main body (3) of the punching machine is controlled to contract so that the punching rod (301) drives the punching plate (303) to move upward, and drives the punching plate (303) to separate from the top of the upper mold (6), and the fixing plate (505) is rotated to separate from the cross slide bar (503), and the two groups of cross slide bars (503) are pushed and squeezed to approach each other, so that the bottom ends of the cross slide bars (503) are close to each other in the L-shaped slot (202), and the lower mold (4) and the fixing seat (5) are pulled out from the installation slot (201), and at the same time, the upper mold (6) is stuck on the top of the lower mold (4) and is pulled out of the installation slot (201) at the same time; A new set of lower mold (4) and upper mold (6) are selected and placed on one side of the installation groove (201), so that the limiting roller (8) corresponds to the limiting slide groove (203), and the fixing seat (5) is pushed to insert the lower mold (4) into the installation groove (201), and at the same time, the two sets of cross slide bars (503) are squeezed until the cross slide bars (503) are inserted into the corresponding L-shaped slots (202). After the lower mold (4) and the upper mold (6) move to the bottom of the stamping plate (303), the cross slide bars (503) are released. Under the rebound effect of the fixing spring (504), the cross slide bar (503) is reset and clamped and fixed inside the L-shaped clamping groove (202). At the same time, the fixing clamping plate (505) is rotated to clamp the fixing clamping hole (506) on the top of the cross slide bar (503). The cross slide bar (503) is clamped and fixed, and the lower mold (4) and the fixing seat (5) are clamped and fixed inside the installation groove (201). The punching machine body (3) is controlled to extend so that the punching plate (303) is closely attached to the top of the upper mold (6). The punching machine body (3) is controlled to extend so that the punching plate (303) is closely attached to the top of the upper mold (6). The fixing bolt (602) is inserted into the corresponding fixing slot (304), and the fixing nut (603) is tightened to fix the fixing bolt (602) in the fixing slot (304), thereby connecting and fixing the upper mold (6) and the punching plate (303). The punching machine body (3) is controlled to contract so that the punching plate (303) drives the upper mold (6) to move upward and away from the lower mold (4), and the cut plate is placed on the top of the lower mold (4). The upper mold (6) is controlled to press downward until the punch is (604) presses the plate into the inside of the die (401) to form the plate by stamping. At the same time, the plate is pressed into the inside of the die (401) to press the lifting frame (403) downward, so that the limit plate (405) squeezes the lifting spring (406) to deform. When the upper mold (6) moves upward to make the male mold (604) separate from the inside of the die (401), the lifting spring (406) rebounds to lift the lifting frame (403), so that the formed plate is pushed out of the die (401), making it convenient to take the formed plate.

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