A sheet metal extrusion workpiece bending method

Abstract

The invention discloses a bending method for sheet metal extrusion workpieces. After the first bending is completed, the second bending exceeds 90°, the bending part of the bent workpiece is retreated to the inner side of the tip of the upper and lower pressing knives, the upper folding knife Z axis rises to a position where its tip ball is higher than the position above the second bending part of the bent workpiece, and the X axis advances to the position of the second bending part of the bent workpiece, and then the upper folding knife Z axis presses down a specified distance to extrude the bent workpiece, so as to realize continuous deep bending of the extruded workpiece. The invention improves the forming efficiency and bending accuracy of sheet metal extrusion bending workpieces, gets rid of the limitation of bending molds, reduces costs, makes bending more flexible and convenient, does not need to adjust the position manually, and realizes intelligent and automatic bending process.

Description

Technical Field

[0001] The invention relates to the technical field of automated bending, in particular to a method for bending a sheet metal extrusion workpiece. Background Art

[0002] In the existing sheet metal bending technology, a stamping upper die is generally used in conjunction with a special bending die (a V-groove die with a common angle of 30 degrees) to bend the workpiece. During the bending process, due to the limitation of the bending die, it is not possible to bend too large an angle at one time, and it is necessary to manually adjust the position and use a flattening die to perform secondary edge bending on the folded edge. The existing bending method has low accuracy. After one side of the workpiece is bent multiple times, the structure of the workpiece becomes complicated. Due to the limitation of the flattening die, some positions that do not meet the angle requirements cannot be effectively bent in depth and flattened, which increases the difficulty of bending and complicates the bending process, resulting in low production efficiency and correspondingly increased costs. Moreover, even some existing intelligent bending equipment cannot well meet the continuous deep bending requirements and flattening of the bent edge. Summary of the invention

[0003] The purpose of the present invention is to provide a sheet metal extrusion workpiece bending method in view of the deficiencies in the prior art, which realizes continuous deep bending and flattening of the bent workpiece by extruding the bent workpiece.

[0004] Technical solution: The technical solution adopted by the present invention to solve the problem is: a sheet metal extrusion workpiece bending method, characterized in that it includes the following steps:

[0005] 1. A method for bending a sheet metal extrusion workpiece, comprising the following steps:

[0006] 1) Select the fully automatic sheet metal bending processing device, move the upper and lower bending knives of the device to the first knife folding position on the X-axis and Z-axis, move the upper pressing knife to the set initial position, return the U-axis assembly to the position pressing the bent workpiece, return the W-axis assembly to the initial position, rotate the C-axis and C1-axis pressing claws to 0 degrees, and move the Y1, Y2, and U1 rulers to the position of the reserved spacing for the bent workpiece. The Y1 and Y2 rulers are raised at the same time, and the U1 axis ruler is lowered;

[0007] 2) After placing the bending workpiece in the reserved position on the work surface, completely fix the bending workpiece, and make the bending edge of the bending workpiece face the upper and lower pressing knives, the bending line is parallel to the top surface of the knife tip, and send the bending workpiece to the first knife bending position;

[0008] 3) Through the operation of step 2), the bending edge of the bent workpiece is located between the upper and lower pressing knives, and the bending begins. The upper pressing knife presses the bent workpiece, and the Z-axis motor controls the tool holder assembly to move up and down, so that the upper and lower bending knives squeeze the bent workpiece to achieve upward bending or downward bending. The X-axis slide assembly moves forward to control the bending knife in the tool holder assembly to bend forward. The first knife angle bending of the bent workpiece can be achieved by controlling the moving distance of the Z-axis and the X-axis;

[0009] 4) After the first knife bending is completed, the Z axis and X axis of the bending knife retreat to the next knife bending preparation position, the W axis upper pressure knife is raised, and the U axis assembly continues to transport the bent workpiece forward. Repeating the above bending action can achieve continuous bending; when the bending of one side of the bending workpiece is completed, the W axis upper pressure knife moves up, and the U axis assembly leads the bending workpiece to retreat, and according to the specific bending shape of the bending workpiece, if there is interference when the upper pressure knife moves up, it is necessary to move the workpiece to avoid the position, then lift the upper pressure knife, and then the U axis assembly leads the bending workpiece to retreat; at the same time, the upper and lower pressure claws rotate the bending workpiece to the next side of the bending under the drive of the C axis and C1 axis motors, the W axis upper pressure knife drops to the initial position, and the U axis assembly transports the bending workpiece forward again, stops after reaching the bending position, and the W axis upper pressure knife falls, presses the bending workpiece, and then the other bending side of the bending workpiece can continue to bend; this process is a multi-axis linkage process, and the U axis and W axis move simultaneously.

[0010] Furthermore, the bending edge of the bent workpiece in step 4) can also be bent continuously and deeply by extruding the bent workpiece, and the specific steps are as follows: after the first bending of the bending edge of the bent workpiece is completed, Figure 2 As shown, the second bend needs to be upward more than 90°, such as Figure 3 As shown, the W-axis upper pressure knife is then lifted up to release the front end position of the bent workpiece. At this time, the bent workpiece is fixed by the pressure claw on the rear U-axis assembly, and the bent workpiece moves with the pressure claw; the bending knife Z-axis and X-axis return to the bending position of the bent workpiece, and the U-axis assembly retreats at the same time, so that the bending part of the bent workpiece retreats to the inner side of the tip of the upper and lower pressure knives, and the upper folding knife Z-axis rises to a position where its tip ball is higher than the second bending part of the bent workpiece. At this time, the X-axis advances to the position of the second bending part of the bent workpiece, and then the upper folding knife Z-axis presses down a specified distance to squeeze the bent workpiece, so as to achieve continuous deep bending of the extruded workpiece. The continuous bending effect is shown in FIG. Figure 4 shown.

[0011] Furthermore, the specific operations in the step 1) are as follows: turn on the X-axis motor in the base assembly, the X-axis screw drives the slide assembly, the Z-axis motor in the slide assembly controls the Z-axis screw to drive the tool holder assembly to move the upper and lower bending knives X-axis and Z-axis to the first knife folding position, and then, in the W-axis assembly, the W-axis motor controls the W-axis screw to drive the lower pressure assembly to move, so that the upper pressure knife runs to the set initial position, and finally, driven by the U-axis motor, the upper and lower pressure claws in the arm pressure assembly return to the position of pressing the bent workpiece.

[0012] The U-axis assembly in the present invention is a fixed assembly, and the arm pressure assembly is a secondary assembly of the U-axis assembly. The U-axis moves forward and backward under the drive of the motor screw, and the upper and lower pressure claws in the arm pressure assembly clamp the workpiece.

[0013] Furthermore, the specific operation in the step 2) is as follows: after the bent workpiece is placed in the reserved position on the worktable, the v1-axis ruler in the U-axis assembly rises, and at this time the bent workpiece is exactly located between the three rulers Y1, Y2, and U1. Then the three rulers Y1, Y2, and U1 run to the clamping position to clamp the bent workpiece, and the W1-axis pressure claw presses down to press the bent workpiece. At this time, the bent workpiece is completely fixed, and the bending edge position of the bent workpiece must be directly opposite the upper and lower pressure knives, and the bending line is parallel to the top surface of the knife tip. Then the Y1, Y2, and U1 rulers retreat to the spacing position reserved for the bent workpiece clamping position, and then the three rulers descend at the same time, the U-axis motor starts, and the U-axis assembly clamps the bent workpiece through the upper and lower pressure claws and moves it to the knife pressure position and sends it to the first knife bending position.

[0014] Furthermore, the specific operations in the step 3) are as follows: after the feeding is completed, the bending edge of the bent workpiece is located between the upper and lower pressing knives, and the bending action starts. The W-axis motor controls the lower pressing assembly to move downward, and the upper pressing knife completely presses the bent workpiece. The Z-axis motor controls the tool holder assembly to move up and down, so that the upper and lower bending knives squeeze the bending workpiece to achieve upward or downward bending, and the X-axis slide assembly moves forward to control the bending knife in the tool holder assembly to bend forward. By controlling the moving distance of the Z-axis and the X-axis, bending at any angle can be achieved.

[0015] Furthermore, the upper folding knife Z axis rises to a position where the tip ball is slightly higher than the second bending position of the bent workpiece by 1-2 mm. In specific operations, the height position can be adjusted automatically according to working conditions.

[0016] Furthermore, the fully automatic sheet metal bending processing device is configured as a bending mechanism of the LHA02-2000P model, which can realize 9-axis concurrent linkage and a maximum of 44-axis linkage, and is provided with an automatic bending and pressing mechanism, a self-driven integrated loading and unloading automation component, and an automatic bending mechanism.

[0017] Beneficial effects: Compared with the prior art, the present invention has the following advantages: Compared with traditional bending, the bending method of the present invention can achieve continuous deep bending and flattening bending effects of the bent workpiece by extruding the sheet metal workpiece, thereby improving the forming efficiency and bending accuracy of the sheet metal extrusion bending workpiece, getting rid of the limitations of the bending mold, reducing costs, making bending more flexible and convenient, and eliminating the need for manual position adjustment, making the bending process intelligent and automated. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the first knife bending of the present invention;.

[0019] Figure 2 This is a schematic diagram of the second knife bending of the present invention;

[0020] Figure 3 This is a diagram showing the position of the lower folding knife during continuous deep bending of the present invention;

[0021] Figure 4 This is a diagram showing the continuous deep bending effect of the present invention;

[0022] Figure 5 This is a structural diagram of the fully automatic sheet metal bending processing device in Example 1 of the present invention. DETAILED DESCRIPTION

[0023] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. The embodiments are implemented based on the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0024] Example 1

[0025] The fully automatic sheet metal bending process used in this embodiment is a flexible bending center model LHA02-2000P produced by Nanjing Lanhao Intelligent Technology Co., Ltd. The flexible bending center can realize 9-axis concurrent linkage and a maximum of 44-axis linkage. It is equipped with an automatic bending and pressing mechanism, a self-driven loading and unloading integrated automation component, and an automatic bending mechanism. The bending mechanism consists of a base component, a slide assembly, a W-axis assembly, a pressing assembly, a tool holder assembly, and a U-axis assembly; the specific axial motion relationship is as follows Figure 5 As shown:

[0026] X-axis: controls the forward and backward movement of the bending knife (dual drive);

[0027] U axis: controls the forward and backward movement of the arm press frame;

[0028] U1 axis: controls the front ruler to move forward and backward;

[0029] Y1 axis: controls the left Y ruler to move left and right;

[0030] Y2 axis: controls the right Y ruler to move left and right;

[0031] C axis: controls the rotation of C axis chuck;

[0032] C1 axis: controls the rotation of C1 axis chuck;

[0033] Z axis: controls the bending knife to move up and down

[0034] Z1 axis: controls the left power hinge knife side knife to move up and down;

[0035] Z2 axis: controls the right power hinge knife side knife to move up and down;

[0036] W axis: controls the upper pressing knife to move up and down (dual drive);

[0037] W1 axis: controls the up and down movement of the C1 axis chuck.

[0038] Before starting bending, this embodiment needs to be adjusted according to the above-mentioned axial mechanisms, and a series of preparatory actions are required: first, in the base assembly, the X-axis motor is started, and the X-axis screw drives the slide assembly. The Z-axis motor in the slide assembly controls the Z-axis screw to drive the tool holder assembly to move the upper and lower bending knives X-axis and Z-axis to the first knife to be folded position. Then, in the W-axis assembly, the W-axis motor controls the W-axis screw to drive the pressing assembly to move, so that the upper pressing knife runs to the set initial position. Finally, the U-axis assembly returns to the position of pressing the bent workpiece under the drive of the U-axis motor, wherein the W1-axis pressing claw returns to the initial position, the C-axis and C1-axis pressing claws rotate to 0 degrees, and the Y1, Y2, and U1 rulers run to the position of the reserved spacing for the bent workpiece, the Y1 and Y2 rulers rise at the same time, and the U1-axis ruler is lowered.

[0039] After the preparation action is completed, the feeding action before bending begins: when the bent workpiece is placed in the reserved position on the worktable, the U1-axis ruler in the U-axis assembly rises. At this time, the bent workpiece is exactly located between the three rulers Y1, Y2, and U1. Then the three rulers Y1, Y2, and U1 run to the clamping position to clamp the bent workpiece. The W1-axis pressure claw presses down to press the bent workpiece. At this time, the bent workpiece is completely fixed, and the bending edge position of the bent workpiece must be directly opposite the upper and lower pressure knives. The bending line is parallel to the top surface of the knife tip. Then the Y1, Y2, and U1 rulers retreat to the spacing position reserved for the bending workpiece clamping position. Then the three rulers descend at the same time, the U-axis motor starts, and the U-axis assembly clamps the bent workpiece through the upper and lower pressure claws and moves it to the knife pressure position and sends it to the first knife bending position.

[0040] After the feeding is completed, the bending edge of the bending workpiece is located between the upper and lower pressing knives, and the bending action can begin. The W-axis motor controls the lower pressing assembly to move downward, and the upper pressing knife completely presses the bending workpiece. The Z-axis motor controls the tool holder assembly to move up and down, so that the upper and lower bending knives squeeze the bending workpiece to achieve upward or downward bending, and the X-axis slide assembly moves forward to control the bending knife in the tool holder assembly to bend forward. In this way, by controlling the moving distance of the Z-axis and X-axis, bending at almost any angle can be achieved. The bending effect is as follows: Figure 1 shown.

[0041] After the bending is completed, the Z-axis and X-axis of the bending knife retreat to the position for the next bending preparation, the W-axis upper pressure knife is raised, and the U-axis assembly continues to transport the bent workpiece forward. Repeating the above bending action can achieve continuous bending. When one side of the bending is completed, the W-axis upper pressure knife moves up, and the U-axis assembly leads the bent workpiece backward. At the same time, the upper and lower pressure claws rotate the bent workpiece to the next side of the bending under the drive of the C-axis and C1-axis motors. The W-axis upper pressure knife drops to the initial position, and the U-axis assembly transports the bent workpiece forward again. It stops when it reaches the bending position, and the W-axis upper pressure knife falls to press the bent workpiece, and then the bending can continue.

[0042] On this basis, when one side of the bending workpiece needs to be bent deeply for multiple times, and the second reverse bending needs to bend at a larger angle and flattened, the final forming effect can be achieved by extruding the bending workpiece. The specific plan is as follows:

[0043] When the first bending of the bending edge of the workpiece is completed, Figure 2 As shown, the second bend needs to be upward more than 90°, such as Figure 3 As shown, the W-axis upper pressure knife is then lifted up to release the front end position of the bent workpiece. At this time, the bent workpiece is fixed by the pressure claw on the rear U-axis assembly, and the bent workpiece moves with the pressure claw; the bending knife Z-axis and X-axis return to the bending position of the bent workpiece, and the U-axis assembly retreats at the same time, so that the bending part of the bent workpiece retreats to the inner side of the tip of the upper and lower pressure knives, and the upper folding knife Z-axis rises to a position where its tip ball is higher than the second bending part of the bent workpiece. At this time, the X-axis advances to the position of the second bending part of the bent workpiece, and then the upper folding knife Z-axis presses down a specified distance to squeeze the bent workpiece, so as to achieve continuous deep bending of the extruded workpiece. The continuous bending effect is shown in FIG. Figure 4 shown.

[0044] Compared with traditional bending, the bending method of the present invention can achieve continuous deep bending and flattening bending effects of the bent workpiece by extruding the sheet metal workpiece, thereby improving the forming efficiency and bending accuracy of the sheet metal extrusion bending workpiece, getting rid of the limitations of the bending mold, reducing costs, making bending more flexible and convenient, and eliminating the need for manual position adjustment, making the bending process intelligent and automated.

[0045] The above specific implementation is only a preferred embodiment of the present invention and is not intended to limit the implementation of the present invention and the scope of the claims. All equivalent changes and modifications made according to the content of the patent protection scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A method for bending a sheet metal extrusion workpiece, characterized in that: The following steps are involved: 1) Select the fully automatic sheet metal bending processing device, move the upper and lower bending knives of the device to the first knife folding position on the X-axis and Z-axis, move the upper pressing knife to the set initial position, return the U-axis assembly to the position pressing the bent workpiece, return the W-axis assembly to the initial position, rotate the C-axis and C1-axis pressing claws to 0 degrees, and move the Y1, Y2, and U1 rulers to the position of the reserved spacing for the bent workpiece. The Y1 and Y2 rulers are raised at the same time, and the U1 axis ruler is lowered; 2) After placing the bending workpiece in the reserved position on the work surface, completely fix the bending workpiece, and make the bending edge of the bending workpiece face the upper and lower pressing knives, the bending line is parallel to the top surface of the knife tip, and send the bending workpiece to the first knife bending position; the specific operations are as follows: After the bending workpiece is placed in the reserved position on the worktable, the U1-axis ruler in the U-axis assembly rises. At this time, the bending workpiece is exactly located between the three rulers Y1, Y2, and U1. Then, the three rulers Y1, Y2, and U1 run to the clamping position to clamp the bending workpiece. The W1-axis pressure claw presses down to press the bending workpiece. At this time, the bending workpiece is completely fixed, and the bending edge position of the bending workpiece must be directly opposite the upper and lower pressure knives. The bending line is parallel to the top surface of the knife tip. Then, the Y1, Y2, and U1 rulers return to the spacing position reserved for the bending workpiece clamping position. Then, the three rulers descend at the same time, the U-axis motor starts, and the U-axis assembly clamps the bending workpiece through the upper and lower pressure claws and moves it to the pressure knife position and sends it to the first knife bending position. 3) Through the operation of step 2), the bending edge of the bent workpiece is located between the upper and lower pressing knives, and the bending begins. The upper pressing knife presses the bent workpiece, and the Z-axis motor controls the tool holder assembly to move up and down, so that the upper and lower bending knives squeeze the bent workpiece to achieve upward bending or downward bending. The X-axis slide assembly moves forward to control the bending knife in the tool holder assembly to bend forward. By controlling the moving distance of the Z-axis and the X-axis, the angle bending of the first knife of the bent workpiece can be achieved; 4) After the first knife bending is completed, the Z-axis and X-axis of the bending knife retreat to the next knife bending preparation position, the W-axis upper pressure knife is raised, and the U-axis assembly continues to transport the bent workpiece forward. Repeating the above bending action can achieve continuous bending; when the bending of one side of the bending workpiece is completed, the W-axis upper pressure knife moves up, and the U-axis assembly leads the bent workpiece to retreat. At the same time, the upper and lower pressure claws rotate the bent workpiece to the next side of the bending under the drive of the C-axis and C1-axis motors. The W-axis upper pressure knife drops to the initial position, and the U-axis assembly transports the bent workpiece forward again. After reaching the bending position, it stops, and the W-axis upper pressure knife falls to press the bent workpiece, so that the other bending side of the bent workpiece can continue to bend; The bending edge of the bent workpiece in the step 4) can also be continuously bent by extruding the bent workpiece, and the specific steps are as follows: after the first knife bending of the bending edge of the bent workpiece is completed, the second knife bending needs to be upward more than 90°, and then the W-axis upper pressure knife is lifted to release the front end position of the bent workpiece. At this time, the bent workpiece is fixed by the pressure claw on the rear U-axis assembly, and the bent workpiece moves with the pressure claw; the bending knife Z axis and X axis return to the bending position of the bent workpiece, and the U-axis assembly retreats at the same time, so that the bending part of the bent workpiece retreats to the inner side of the tip of the upper and lower pressure knives, and the upper folding knife Z axis rises to a position where its tip ball is higher than the second bending part of the bent workpiece. At this time, the X axis advances to the position of the second bending part of the bent workpiece, and then the upper folding knife Z axis presses down a specified distance to extrude the bent workpiece to achieve continuous deep bending of the extruded workpiece.

2. A sheet metal extrusion workpiece bending method according to claim 1, characterized in that: The specific operations in step 1) are as follows: turn on the X-axis motor in the base assembly, the X-axis screw drives the slide assembly, the Z-axis motor in the slide assembly controls the Z-axis screw to drive the tool holder assembly to move the upper and lower bending knives X-axis and Z-axis to the first knife folding position, and then in the W-axis assembly, the W-axis motor controls the W-axis screw to drive the lower pressing assembly to move so that the upper pressing knife runs to the set initial position. At the same time, the arm pressing assembly in the U-axis assembly carries the upper and lower pressing claws back to the position of pressing the bent workpiece under the drive of the U-axis motor.

3. A sheet metal extrusion workpiece bending method according to claim 1, characterized in that: The specific operation in step 3) is as follows: after the feeding is completed, the bending edge of the bent workpiece is located between the upper and lower pressing knives, and the bending action begins. The W-axis motor controls the lower pressing assembly to move downward, and the upper pressing knife completely presses the bent workpiece. The Z-axis motor controls the tool holder assembly to move up and down, so that the upper and lower bending knives squeeze the bent workpiece to achieve upward bending or downward bending, and the X-axis slide assembly moves forward to control the bending knife in the tool holder assembly to bend forward. By controlling the moving distance of the Z-axis and the X-axis, bending at any angle can be achieved.

4. A sheet metal extrusion workpiece bending method according to claim 1, characterized in that: The upper folding knife Z axis rises to a position where the knife tip ball is slightly higher than the position 1-2mm above the second bending point of the bent workpiece.

5. A sheet metal extrusion workpiece bending method according to claim 1, characterized in that: The fully automatic sheet metal bending processing device is configured as a bending mechanism of the LHA02-2000P model, which can realize 9-axis concurrent linkage and a maximum of 44-axis linkage, and is provided with an automatic bending and pressing mechanism, a self-driven integrated loading and unloading automation component, and an automatic bending mechanism.

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