Bending device with variable bending angle

Abstract

The utility model discloses a variable bending angle bending device which comprises an upper die, a lower die, an L supporting block assembly and an R supporting block assembly, the L supporting block assembly and the R supporting block assembly are respectively connected with a lower die plate in a sliding mode, and the L supporting block assembly and the R supporting block assembly slide relatively in the X-axis direction. When the bending device is closed, a pipe is placed between the upper die and the lower die and is extruded and bent by the upper die and the lower die, and the L-shaped supporting block assembly and the R-shaped supporting block assembly adjust the bending radian of the two sides of the pipe correspondingly. According to the variable-bending-angle bending method for the pipe, the bending angle can be changed by adjusting the center positions of the supporting blocks on the two sides and the return stroke final position of the lower die, the size of a die cavity can be adjusted conveniently, rebound deformation can be adjusted and controlled, rebound deformation of a part can be effectively compensated, the upper die and the lower die are always attached in the whole bending process, and the bending efficiency is improved. And undesirable conditions such as wrinkles and deformation of the bending angle of the part can be prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe bending angle control, in particular to a variable bending angle bending device. Background Art

[0002] The bending process is completed in two steps. The first step is to press the hollow tube into a specific bending shape; the second step is to perform internal high pressure forming to bulge the curved corner area of ​​the part to reach the final profile state. Press bending is the most critical process in the production of bent tubes. Conventional press bending methods include Figure 1 As shown in the figure, the tube is placed in the lower mold of the mold, and the upper mold is moved down until the mold is closed. The tube is deformed under pressure until it completely fits the mold cavity, so that the part obtains the specified bending angle θ2; because the mold cavity size is unique, after the part is pressurized, the inner bend is contracted by the pressure material, and the outer bend is stretched by the tension material, as shown in the figure. Figure 2 As shown, due to the reversible elasticity of the material, springback θ1<θ2 is generated. Therefore, parts processed by conventional press bending methods cannot fully meet the design angle requirements. The springback can only be compensated by modifying the mold cavity size. However, the springback amount is different for different material strength properties, and the springback compensation value cannot be accurately determined. Press bending springback is a problem that is difficult to solve by conventional press bending methods.

[0003] Patent document with application number CN201720374723.7 discloses a U-shaped bending die, which has the characteristics of simple structure, high precision of formed parts, good quality and high production efficiency. However, it also has the following problems: complex structure, not suitable for large-angle bending of pipes, and difficult to adjust the bending rebound. Utility Model Content

[0004] The utility model aims to provide a variable bending angle bending device to solve the problem that the size of the mold cavity is difficult to adjust and the springback compensation amount of the pipe is difficult to adjust and control.

[0005] The purpose of the utility model can be achieved through the following technical solutions: a variable bending angle bending device, comprising:

[0006] An upper mold, the upper mold being connected to an upper mold plate;

[0007] A lower mold, the lower mold is connected to the lower mold plate;

[0008] An L support block assembly and an R support block assembly, wherein the L support block assembly and the R support block assembly are arranged on both sides of the lower mold and are slidably connected to the lower mold plate respectively, and the L support block assembly and the R support block assembly slide relatively along the X-axis direction;

[0009] Among them, when the bending device is closed, the pipe is placed between the upper mold and the lower mold and is squeezed and bent by the upper mold and the lower mold, and the L support block assembly and the R support block assembly respectively adjust the curvature of the bending on both sides of the pipe.

[0010] Optionally, a displacement controller Z is provided between the lower die and the lower mold plate, and the displacement controller Z controls the lower die to slide along the Y-axis direction.

[0011] Optionally: the L support block assembly includes: a support block L, a displacement controller L and a support block base L;

[0012] Among them, the support block L is connected to the support block base L, the support block base L is connected to the lower template, and the displacement controller L controls the support block base L to slide along the X-axis direction;

[0013] The R support block assembly includes: a support block R, a displacement controller R and a support block base R;

[0014] Among them, the support block R is connected to the support block base R, the support block base R is connected to the lower template, and the displacement controller R controls the support block base R to slide along the X-axis direction.

[0015] Optionally: the L support block assembly further comprises a rotation shaft L, the support block L is rotationally connected to the support block base L, and the rotation shaft L controls the rotation angle of the support block L rotationally connected to the support block base L;

[0016] The R support block assembly also includes a rotation axis R, the support block R is rotatably connected to the support block base R, and the rotation axis R controls the rotation angle of the support block R rotatably connected to the support block base R.

[0017] Optionally: the pipe includes a round pipe, a square pipe and an oval pipe.

[0018] Beneficial effects of the utility model:

[0019] The utility model discloses a variable bending angle bending method for pipes. The servo-controlled displacement controller L / R / A can be used during the bending process. The bending angle can be changed by adjusting the center positions of the support blocks on both sides and the return end position of the lower die. The mold cavity size can be adjusted conveniently. The rebound deformation can be controlled and the rebound deformation of the parts can be effectively compensated. The upper die and the lower die are always in close contact during the entire bending process, which can prevent the parts from having wrinkles, deformation and other undesirable conditions at the bending corners. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of an existing bending device;

[0021] Figure 2 Schematic diagram of springback of pipe bent by press bending device;

[0022] Figure 3 It is a structural schematic diagram of the bending device of the utility model.

[0023] A. Pipe material;

[0024] 110, upper template; 120, upper mold; 130, lower template; 140, lower mold; 150, L support block assembly; 151, support block L; 152, displacement controller L; 153, support block base L; 154, rotation axis L; 160, R support block assembly; 161, support block R; 162, displacement controller R; 163, support block base R; 164, rotation axis R; 170, displacement controller Z. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0026] like Figure 3 As shown, the utility model discloses a variable bending angle bending device, including: an upper die 120, a lower die 140, an L support block assembly 150 and an R support block assembly 160.

[0027] The upper mold 120 is connected to the upper mold plate 110 , and moves up and down along the Y-axis direction with the upper mold plate 110 , and the lower mold 140 is connected to the lower mold plate 130 .

[0028] Preferably, a displacement controller Z170 is arranged between the lower mold 140 and the lower mold plate 130, the upper end of the displacement controller Z170 is connected to the lower mold 140, and the lower end of the displacement controller Z170 is connected to the lower mold plate 130. The displacement controller Z170 can be implemented by devices such as an oil cylinder, an air cylinder, and a wedging mechanism. The displacement controller Z170 controls the upward and downward displacement of the lower mold 140 along the Y-axis direction.

[0029] The L support block assembly 150 and the R support block assembly 160 are disposed opposite to each other on both sides of the lower mold 140 and are slidably connected to the lower mold plate 130 respectively. The L support block assembly 150 and the R support block assembly 160 slide relatively along the X-axis direction.

[0030] When the press-bending device is closed, the tube A is placed between the upper die 120 and the lower die 140 and is squeezed and bent by the upper die 120 and the lower die 140. The L support block assembly 150 and the R support block assembly 160 respectively adjust the curvature of the bending on both sides of the tube A, wherein the tube A can be a round tube, a square tube, an elliptical tube, etc.

[0031] Specifically, Figure 3As shown, the L support block assembly 150 includes: a support block L151, a displacement controller L152 and a support block base L153; wherein, the support block L151 is connected to the support block base L153, ​​the support block base L153 is connected to the lower template 130, and the displacement controller L152 controls the support block base L153 to slide along the X-axis direction.

[0032] The R support block assembly 160 includes: a support block R161, a displacement controller R162 and a support block base R163; wherein the support block R161 is connected to the support block base R163, the support block base R163 is connected to the lower template 130, and the displacement controller R162 controls the support block base R163 to slide along the X-axis direction.

[0033] The displacement controller L152 and the displacement controller R162 can be implemented by using devices such as oil cylinders, air cylinders, and wedging mechanisms. The support block base can be connected through the displacement controller L152 and the displacement controller R162, and the support block base can be slid along the X-axis direction by using devices such as oil cylinders, air cylinders, and wedging mechanisms to extend and retract.

[0034] Further, such as Figure 3 As shown, the L support block assembly 150 further includes a rotation axis L154 , and the R support block assembly 160 further includes a rotation axis R164 .

[0035] The support block L151 is rotatably connected to the support block base L153, ​​and the rotation axis L154 controls the inclination angle of the support block L151 relative to the support block base L153; the support block R161 is rotatably connected to the support block base R163, and the rotation axis R164 controls the inclination angle of the support block R161 relative to the support block base R163, so that the inclined surfaces of the support block L151 and the support block R161 can better fit the pipe A.

[0036] Principle of the utility model:

[0037] The bending die of the utility model mainly comprises an upper die 120, a lower die 140, a support block L151, a support block R161, a displacement controller L152, a displacement controller R162 and a displacement controller Z170. The upper mold 120 is fixedly connected to the upper mold plate 110. As the upper mold plate 110 moves up and down, the lower mold 140 is controlled by the displacement controller Z170 to move up and down. The support block L151 and the support block R161 are slidably connected to the lower mold plate 130 through the support block base. The lower mold plate 130 is provided with a guide rail. The lower mold plate 130 and the support block base form a sliding combination. The support block base L153 and the support block base R163 can slide along the guide rail of the lower mold plate 130 along the X-axis direction. The displacement controller L152 and the displacement controller R162 control the sliding position of the support block L151 and the support block R161 respectively. The rotating shaft L154 adjusts the inclination angle of the support block L151 and the support block base L153 according to the bending requirements and locks them. The rotating shaft R164 adjusts the inclination angle of the support block R161 and the support block base R163 according to the bending requirements and locks them.

[0038] In the mold opening state, the lower mold 140 and the upper mold 120 are separated, and the displacement controller Z170 controls the lower mold 140 to move upward, the lower mold 140 is lifted up, and the pipe A is placed in the lower mold 140; after the pipe A is placed, the bending operation begins, and the displacement controller L152 and the displacement controller R162 push the support block L151 and the support block R161 forward to the set position respectively; the hydraulic press moves downward to drive the upper mold plate 110 and the upper mold 120 to press downward, and the displacement controller Z170 is The lower die 140 provides a force from bottom to top, so that the upper die 120 and the lower die 140 fit and clamp the middle area of ​​the pipe A to prevent wrinkles and deformation at the highest point of the middle bend; the support blocks L151 and R161 on both sides rotate with the force and always fit with the outer surface of the pipe A; the hydraulic press drives the upper die 120 downward, and the displacement controller Z170 controls the lower die 140 to move downward to the set end position, and the pipe A is bent in place; the hydraulic press returns, and the bending step of the pipe A is completed.

[0039] The support block L151 and the support block R161 are set by sliding, and the positions of the support blocks L151 and R161 determine the size of the bending angle. If the support blocks L151 and R161 are relatively far away from each other, the bending angle of the tube A becomes larger, and if the support blocks L151 and R161 are relatively close to each other, the bending angle of the tube A becomes smaller. The lower mold 140 is controlled to move up and down by the displacement controller Z170, and the downward end position of the lower mold 140 determines the size of the bending angle, and the lower the lower mold 140 moves, the larger the bending angle becomes.

[0040] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes according to the technical scheme and concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0041] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "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.

[0042] 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 at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0043] 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 one; it can be a mechanical connection, an electrical connection, or communication with each other; 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

Claims

1. A variable bending angle bending device, characterized in that: include An upper mold (120), wherein the upper mold (120) is connected to the upper mold plate (110); A lower mold (140), wherein the lower mold (140) is connected to the lower mold plate (130); An L support block assembly (150) and an R support block assembly (160), wherein the L support block assembly (150) and the R support block assembly (160) are arranged on both sides of the lower mold (140) and are respectively slidably connected to the lower mold plate (130), and the L support block assembly (150) and the R support block assembly (160) slide relatively along the X-axis direction; When the bending device is closed, the tube (A) is placed between the upper die (120) and the lower die (140) and is squeezed and bent by the upper die (120) and the lower die (140), and the L support block assembly (150) and the R support block assembly (160) respectively adjust the curvature of the bending on both sides of the tube (A).

2. A variable bending angle bending device according to claim 1, characterized in that: A displacement controller Z (170) is provided between the lower mold (140) and the lower mold plate (130), and the displacement controller Z (170) controls the lower mold (140) to slide along the Y-axis direction.

3. The variable bending angle bending device according to claim 1, characterized in that: The L support block assembly (150) comprises: a support block L (151), a displacement controller L (152) and a support block base L (153); The support block L (151) is connected to the support block base L (153), the support block base L (153) is connected to the lower template (130), and the displacement controller L (152) controls the support block base L (153) to slide along the X-axis direction; The R support block assembly (160) comprises: a support block R (161), a displacement controller R (162) and a support block base R (163); The support block R (161) is connected to the support block base R (163), the support block base R (163) is connected to the lower template (130), and the displacement controller R (162) controls the support block base R (163) to slide along the X-axis direction.

4. The variable bending angle bending device according to claim 3, characterized in that: The L support block assembly (150) further comprises a rotation shaft L (154), the support block L (151) is rotatably connected to the support block base L (153), and the rotation shaft L (154) controls the rotation angle of the support block L (151) rotatably connected to the support block base L (153); The R support block assembly (160) further comprises a rotation axis R (164), the support block R (161) is rotationally connected to the support block base R (163), and the rotation axis R (164) controls the rotation angle of the support block R (161) rotationally connected to the support block base R (163).

5. The variable bending angle bending device according to claim 1, characterized in that: The pipe (A) includes round pipes, square pipes and oval pipes.

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