A bending machine die with active material withdrawal

Abstract

The utility model discloses a kind of bending machine moulds of initiative material withdrawal, belong to bending machine mould field.A kind of bending machine mould of initiative material withdrawal, including substrate, substrate is equipped with lower mould, the upper side of lower mould is provided with upper mould, a plurality of notches are equipped on lower mould, rotatingly connected with shaft in the inside of notch, the outside of shaft is fixed with tab and curved arm, the end of curved arm is connected with dog by spring, the end of shaft is fixed with ratchet wheel, the outside of lower mould is provided with sliding assembly.The utility model solves the problem that part is tightly covered on upper die due to plastic deformation when using existing bending machine mould, leading to the problem that ejector pin cannot be normally ejected, the utility model is equipped with dog structure rotating synchronously with bending action on lower mould, dog can be timely against on plate upper surface during bending process, so as to provide reverse restraint force when upper die returns, effectively prevent plate from being covered on the outside of upper die due to plastic deformation and friction effect.

Description

Technical Field

[0001] This utility model relates to the field of bending machine molds, specifically a bending machine mold with active material ejection. Background Technology

[0002] Bending machine dies are specialized tools used for bending and forming metal sheets. They typically consist of upper and lower dies. Pressure is applied to bend the sheet at a preset angle. The dies are mostly made of high-strength alloy steel, which is heat-treated to improve wear resistance. The upper die (punch) and lower die (concave) work together to form a V-shaped or U-shaped groove, which determines the bending angle and shape. Their design must take into account the sheet thickness, bending radius, and springback compensation. They are widely used in sheet metal processing, automobile manufacturing, and other fields. They can efficiently complete precise bending operations and are key process equipment for metal forming.

[0003] Existing bending machine dies typically incorporate ejector pin mechanisms for U-shaped bending to eject the sheet metal from the die after bending. However, in practice, due to the intense plastic deformation of the sheet metal during bending, especially for thicker sheets or high-strength metals, the sheet metal often tightly wraps around the outer side of the upper die (punch) after bending. This prevents the ejector pin's thrust from being effectively transmitted to the sheet metal, resulting in difficulties in material removal.

[0004] In summary, to improve the material ejection efficiency of bending machine dies during U-shaped bending, it is necessary to solve the problem that parts tightly wrap around the upper die due to plastic deformation and friction, preventing the ejector pins from ejecting properly. This will enable the die to complete material ejection stably and efficiently, ensuring smooth production and workpiece quality. Utility Model Content

[0005] The purpose of this utility model is to provide a bending machine mold with active material unloading. By setting a claw structure on the lower mold that rotates synchronously with the bending process, the claw can abut against the upper side of the sheet after bending. This prevents the sheet from covering the outside of the upper mold when the upper mold is lifted, thus solving the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an active unloading bending machine mold, comprising a base plate, a lower mold mounted on the base plate, an upper mold disposed on the upper side of the lower mold, a plurality of slots provided on the lower mold, a rotating shaft rotatably connected inside the slots, a paddle and a crank arm fixed on the outer side of the rotating shaft, a pawl connected to the end of the crank arm by a spring, a ratchet fixed to the end of the rotating shaft, a sliding assembly disposed on the outer side of the lower mold, a ratchet tooth disposed on the sliding assembly, a lifting assembly for ejecting parts disposed on the lower mold, and a positioning mechanism for connecting to the hydraulic end of the bending machine disposed on the upper mold.

[0007] Preferably, the sliding assembly includes a guide sleeve fixed to the outside of the lower mold, a slide rod slidably connected inside the guide sleeve, and a pull block fixed to the end of the slide rod, with the slide rod being fixedly connected to a ratchet.

[0008] Preferably, the lifting assembly includes a mounting hole on the lower mold, a lifting spring disposed inside the mounting hole, an ejector pin fixed to the end of the lifting spring, and a top plate fixed to the ejector pin, wherein the ejector pin is slidably connected to the mounting hole.

[0009] Preferably, the positioning mechanism includes a movable component disposed on the upper mold, a driving component disposed on the movable component, a rotating component disposed on the side of the movable component, and a locking component disposed on the rotating component.

[0010] Preferably, the movable component includes a guide rail fixed on the upper mold, a rack disposed inside the guide rail, and a positioning bar fixed on the rack, wherein the positioning bar is slidably connected to the guide rail.

[0011] Preferably, the drive assembly includes two supports fixed on the upper mold, a lead screw rotatably connected between the two supports, and a knob fixed to the end of the lead screw. The knob is used to drive the lead screw to rotate, and the lead screw passes through a rack and is threadedly connected to the rack.

[0012] Preferably, the rotating assembly includes a plurality of gears rotatably connected to the upper mold and a mating block fixed to the gears, the plurality of gears being equally spaced and all of the gears meshing with a rack.

[0013] Preferably, the engaging assembly includes a locking block fixed to the outside of the engaging block, an engaging sleeve sleeved on the outside of the engaging block, a cavity opened inside the engaging sleeve, and a fixing plate fixed to the top of the engaging sleeve. The fixing plate is fixedly connected to the hydraulic end of the bending machine, and the engaging block and the engaging sleeve are slidably connected.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This invention adds a chuck structure to the lower die that rotates synchronously with the bending action. During the bending process, the chuck can abut against the upper surface of the sheet metal at the appropriate time, thereby providing a reverse constraint force when the upper die returns. This effectively prevents the sheet metal from being covered by the outer side of the upper die due to plastic deformation and friction. This design can significantly improve the limitations of traditional ejector mechanisms during material ejection. It is especially suitable for U-shaped bending of small parts. It not only reduces the risk of workpiece deformation and die wear, but also improves the stability and efficiency of material ejection, ensuring that the bent sheet metal accurately detaches from the upper die, and guaranteeing production continuity and consistent forming quality. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0017] Figure 2This is a three-dimensional structural diagram of the lower mold of this utility model;

[0018] Figure 3 This is a schematic diagram of the three-dimensional structure of the claw of this utility model;

[0019] Figure 4 This is a three-dimensional structural diagram of the upper mold of this utility model;

[0020] Figure 5 This is a three-dimensional structural diagram of the docking block of this utility model;

[0021] Figure 6 This is a schematic diagram of the internal three-dimensional structure of the docking sleeve of this utility model.

[0022] In the diagram: 1. Base plate; 2. Lower mold; 3. Upper mold; 4. Rotating shaft; 5. Paddle; 6. Crank arm; 7. Claw; 8. Ratchet; 91. Guide sleeve; 92. Slide rod; 93. Pull block; 10. Ratchet; 111. Mounting hole; 112. Ejector pin; 113. Top plate; 121. Guide rail; 122. Rack; 123. Positioning bar; 124. Support; 125. Lead screw; 126. Knob; 127. Gear; 128. Connecting block; 129. Clamping block; 1210. Fixing plate; 1211. Connecting sleeve; 1212. Cavity. Detailed Implementation

[0023] The present invention will be further described below with reference to specific embodiments.

[0024] Refer to the instruction manual appendix Figures 1 to 6 An active unloading bending machine mold includes a base plate 1, a lower mold 2 mounted on the base plate 1, an upper mold 3 disposed on the upper side of the lower mold 2, a plurality of slots on the lower mold 2, a rotating shaft 4 rotatably connected inside the slots, a paddle 5 and a crank arm 6 fixed on the outer side of the rotating shaft 4, a pawl 7 connected to the end of the crank arm 6 by a spring, a ratchet 8 fixed to the end of the rotating shaft 4, a sliding assembly disposed on the outer side of the lower mold 2, a ratchet tooth 10 disposed on the sliding assembly, a lifting assembly for ejecting parts disposed on the lower mold 2, and a positioning mechanism for connecting to the hydraulic end of the bending machine disposed on the upper mold 3.

[0025] It should be noted that during bending, the upper mold 3 presses down and contacts the paddle 5, which drives the rotating shaft 4 to rotate. The rotating shaft 4 then drives the ratchet 8 and the crank arm 6 to rotate. The engagement of the ratchet 8 and the ratchet tooth 10 can prevent the rotating shaft 4 from rotating back, ultimately causing the end of the chuck 7 to rotate to the upper side of the sheet. When the upper mold 3 returns, the chuck 7 provides a restraining force to prevent the sheet from moving upward with the upper mold 3. At the same time, the lifting component pushes the sheet upward, thereby effectively preventing the sheet from covering the outside of the upper mold 3 and achieving active and reliable material removal.

[0026] Refer to the instruction manual appendix Figure 2 and Figure 3 The sliding assembly includes a guide sleeve 91 fixed to the outside of the lower mold 2, a slide rod 92 slidably connected inside the guide sleeve 91, and a pull block 93 fixed to the end of the slide rod 92. The slide rod 92 is fixedly connected to the ratchet 10.

[0027] It should be noted that by setting the guide sleeve 91 and the slide bar 92, the sliding slide bar 92 can make the ratchet 10 disengage from the tooth groove of the ratchet 8, thereby releasing the lock on the ratchet 8.

[0028] Refer to the instruction manual appendix Figure 2 and Figure 3 The lifting assembly includes a mounting hole 111 on the lower mold 2, a lifting spring disposed inside the mounting hole 111, a ejector pin 112 fixed to the end of the lifting spring, and a top plate 113 fixed to the ejector pin 112. The ejector pin 112 is slidably connected to the mounting hole 111.

[0029] It should be noted that the lifting spring provides an auxiliary lifting force for the bent parts, which, together with the constraint of the chuck 7, ensures that the bent sheet can be smoothly released.

[0030] Refer to the instruction manual appendix Figures 4 to 6 The positioning mechanism includes a moving component disposed on the upper mold 3, a driving component disposed on the moving component, a rotating component disposed on the side of the moving component, and a locking component disposed on the rotating component.

[0031] It should be noted that this positioning mechanism is responsible for achieving stable and rapid connection and positioning between the upper mold 3 and the hydraulic actuator of the bending machine.

[0032] Refer to the instruction manual appendix Figures 4 to 6 The moving component includes a guide rail 121 fixed on the upper mold 3, a rack 122 disposed inside the guide rail 121, and a positioning bar 123 fixed on the rack 122. The positioning bar 123 is slidably connected to the guide rail 121.

[0033] It should be noted that the rack 122 can slide along the inner surface of the guide rail 121 through the cooperation of the positioning strip 123.

[0034] Refer to the instruction manual appendix Figures 4 to 6 The drive assembly includes two supports 124 fixed on the upper mold 3, a lead screw 125 rotatably connected between the two supports 124, and a knob 126 fixed to the end of the lead screw 125. The knob 126 is used to drive the lead screw 125 to rotate. The lead screw 125 passes through the rack 122 and is threadedly connected to the rack 122.

[0035] It should be noted that rotating the knob 126 can drive the lead screw 125 to rotate, and when the lead screw 125 rotates, it can drive the rack 122, which is threadedly engaged with it, to move inside the guide rail 121.

[0036] Refer to the instruction manual appendix Figures 4 to 6 The rotating assembly includes multiple gears 127 rotatably connected to the upper mold 3 and a mating block 128 fixed to the gears 127. The multiple gears 127 are evenly spaced and all of them mesh with the rack 122.

[0037] It should be noted that since the rack 122 meshes with the gear 127, when the rack 122 moves, it can drive multiple gears 127 to rotate synchronously, thereby driving the mating block 128 to rotate.

[0038] Refer to the instruction manual appendix Figure 6 The engaging assembly includes a locking block 129 fixed to the outside of the engaging block 128, an engaging sleeve 1211 sleeved on the outside of the engaging block 128, a cavity 1212 opened inside the engaging sleeve 1211, and a fixing plate 1210 fixed to the top of the engaging sleeve 1211. The fixing plate 1210 is fixedly connected to the hydraulic end of the bending machine, and the engaging block 128 is slidably connected to the engaging sleeve 1211.

[0039] It should be noted that during docking, the connector is inserted into the docking sleeve 1211, and then the rack 122 is moved to rotate the connector. When fully inserted, the locking block 129 is located inside the cavity 1212. Thus, the rotation of the connector can cause the locking block 129 to shift off the slot inside the docking sleeve 1211, thereby achieving quick locking between the connector and the docking sleeve 1211.

[0040] Working Principle: When the bending operation starts, the hydraulic end of the bending machine drives the upper die 3 to press down. Its bottom first contacts the paddle 5 installed in the slot of the lower die 2, forcing the paddle 5 to drive the rotating shaft 4 to rotate. The rotating shaft 4 synchronously drives the crank arm 6 and ratchet 8 fixed on it to rotate. The pawl 7 at the end of the crank arm 6 rotates to the upper surface of the sheet metal. At the same time, the ratchet 8 engages and locks with the ratchet tooth 10 at the front end of the slide bar 92 to prevent the rotating shaft 4 from rotating back. After the bending is completed, the upper die 3 returns to the starting position. At this time, the pawl 7 continues to press against the upper surface of the sheet metal to form a constraint, preventing the sheet metal from moving upward with the upper die 3 due to the covering force. At the same time, the ejector pin 112 in the mounting hole 111 of the lower die 2 pushes the sheet metal upward under the push of the lifting spring. The constraint force of the pawl 7 and the ejection force of the ejector pin 112 work together to ensure that the sheet metal is accurately separated from the upper die 3. The locking of the rotating shaft 4 needs to be released. When the operator manually slides the slide bar 92 inside the guide sleeve 91, the ratchet 10 can be disengaged from the tooth groove of the ratchet 8. The positioning of the upper mold 3 is achieved by operating the knob 126. Rotating the knob 126 drives the lead screw 125 to rotate, which drives the rack 122 to slide along the guide rail 121. The rack 122 meshes with multiple equidistantly distributed gears 127, causing the mating blocks 128 on the gears 127 to rotate. When the connector of the hydraulic end of the bending machine is inserted into the cavity 1212 of the mating sleeve 1211, the locking block 129 on the outside of the mating block 128 is screwed into the internal groove of the mating sleeve 1211 to achieve quick locking. Rotating the knob 126 in the opposite direction will release the locking.

[0041] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A bending machine mold with active material ejection, comprising a base plate (1), characterized in that, A lower mold (2) is mounted on the base plate (1). An upper mold (3) is provided on the upper side of the lower mold (2). The lower mold (2) has multiple slots. A rotating shaft (4) is rotatably connected inside the slots. A paddle (5) and a crank arm (6) are fixed on the outside of the rotating shaft (4). A pawl (7) is connected to the end of the crank arm (6) by a spring. A ratchet (8) is fixed to the end of the rotating shaft (4). A sliding assembly is provided on the outside of the lower mold (2). A ratchet tooth (10) is provided on the sliding assembly. A lifting assembly for ejecting parts is provided on the lower mold (2). A positioning mechanism for connecting to the hydraulic end of the bending machine is provided on the upper mold (3).

2. The bending machine mold with active material unloading according to claim 1, characterized in that, The sliding assembly includes a guide sleeve (91) fixed to the outside of the lower mold (2), a slide rod (92) slidably connected inside the guide sleeve (91), and a pull block (93) fixed to the end of the slide rod (92). The slide rod (92) is fixedly connected to the ratchet (10).

3. The bending machine mold with active material unloading according to claim 1, characterized in that, The lifting assembly includes a mounting hole (111) on the lower mold (2), a lifting spring disposed inside the mounting hole (111), a ejector pin (112) fixed to the end of the lifting spring, and a top plate (113) fixed to the ejector pin (112). The ejector pin (112) is slidably connected to the mounting hole (111).

4. The bending machine mold with active material unloading according to claim 1, characterized in that, The positioning mechanism includes a moving component disposed on the upper mold (3), a driving component disposed on the moving component, a rotating component disposed on the side of the moving component, and a locking component disposed on the rotating component.

5. The bending machine mold with active material unloading according to claim 4, characterized in that, The moving component includes a guide rail (121) fixed on the upper mold (3), a rack (122) disposed inside the guide rail (121), and a positioning bar (123) fixed on the rack (122). The positioning bar (123) is slidably connected to the guide rail (121).

6. The bending machine mold with active material unloading according to claim 5, characterized in that, The drive assembly includes two supports (124) fixed on the upper mold (3), a lead screw (125) rotatably connected between the two supports (124), and a knob (126) fixed to the end of the lead screw (125). The knob (126) is used to drive the lead screw (125) to rotate. The lead screw (125) passes through the rack (122) and is threadedly connected to the rack (122).

7. A bending machine mold with active material unloading according to claim 6, characterized in that, The rotating assembly includes multiple gears (127) rotatably connected to the upper mold (3) and a mating block (128) fixed to the gears (127). The multiple gears (127) are evenly spaced and mesh with the rack (122).

8. A bending machine mold with active material unloading according to claim 7, characterized in that, The engagement assembly includes a locking block (129) fixed to the outside of the docking block (128), a docking sleeve (1211) sleeved on the outside of the docking block (128), a cavity (1212) opened inside the docking sleeve (1211), and a fixing plate (1210) fixed to the top of the docking sleeve (1211). The fixing plate (1210) is fixedly connected to the hydraulic end of the bending machine, and the docking block (128) and the docking sleeve (1211) are slidably connected.

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