CN218460518U

CN218460518U - Numerical control pipe bending die with deformation compensation function

Info

Publication number: CN218460518U
Application number: CN202222602392.1U
Authority: CN
Inventors: 罗建宏; 牛润军; 吴昊; 张温韬; 王波
Original assignee: Shaanxi Aircraft Industry Co Ltd
Current assignee: Shaanxi Aircraft Industry Co Ltd
Priority date: 2022-09-30
Filing date: 2022-09-30
Publication date: 2023-02-10
Anticipated expiration: 2032-09-30

Abstract

The utility model belongs to the technical field of the aviation is made, a take numerical control bending die of deformation compensation is related to. The tool consists of a bending die, a clamping die and a pressing die. The bending die is a one-piece step shaft with a flange at the bottom, arc grooves of the conduits with the same or different pipe diameters are formed in each layer of step, the number, the positions and the sizes of the steps and the arc grooves on the clamping die and the pressing die are matched with those of the bending die, and the shape of the arc groove is an ellipse opposite to the bending direction of the conduit. The tool is high in structural strength, convenient to install and adjust, capable of bending and forming the pipes with different pipe diameters and different bending radiuses, good in universality, capable of compensating the bending deformation of the pipes and capable of improving the quality of the bent pipe.

Description

Numerical control pipe bending die with deformation compensation function

Technical Field

The utility model belongs to the technical field of the aviation, a take numerical control bending die of deformation compensation is related to.

Background

The numerical control bent pipe is a processing method for bending and forming a conduit by adopting numerical control bent pipe equipment and utilizing bent pipe radius tools of different specifications. The structure of a conventional numerical control pipe bending tool is shown in figure 1, and the tool consists of a bending die, a pressing die, a clamping die, a T-shaped key and a connecting plate. The bending die is connected with a machine tool working turntable through a bottom positioning key and a central shaft, the clamping die is connected with a machine tool through a T-shaped key, and the pressing die is connected with the machine tool through a connecting plate. The tool structure has the following defects: one is that bending die bottom navigation key bears great moment of torsion when the pipe is crooked, and the die pressing compresses tightly the pipe on the bending die with pressing from both sides the mould simultaneously, and the center pin need bear certain yawing force, and in order to guarantee intensity, the center pin has the restriction of minimum size, and when pipe diameter and bend radius are less (the bending die outline is little), bending wheel circular arc groove department wall thickness is little, intensity is low, easy deformation. And secondly, the guide pipe with a small diameter is bent, the inner side supporting core rod of the guide pipe cannot be manufactured, and the cross section of the bent guide pipe is easily changed from a circle to an ellipse. Thirdly, the tool is a die and a cavity, is only suitable for the bending of the guide pipe with one specification diameter and bending radius, needs to be replaced when the diameter or the bending radius of the guide pipe changes, is debugged repeatedly, and has low production efficiency.

SUMMERY OF THE UTILITY MODEL

The invention aims to: the numerical control pipe bending die with deformation compensation is provided, and is used for solving the problems that when the bending radius of a small-diameter conduit is smaller, the wall thickness of an arc groove of a bending wheel is small, the strength is low, and the deformation is easy to occur; the problem that the circular section of the pipe after the pipe is bent becomes elliptical; the tool is one die and one cavity, is only suitable for the bending of the guide pipe with one specification diameter and bending radius, needs to be replaced when the diameter or the bending radius of the guide pipe is changed, is debugged repeatedly, and has low production efficiency.

Technical scheme

A numerical control bending die with deformation compensation comprises a bending die 2, a clamping die 4 and a pressing die 5; the bending die 2 is a one-piece step shaft, and the radius of the step is the same as the bending radius required by the forming of the conduit; the front end of the clamping die 4 is provided with a step, the step is provided with a conduit arc groove, and the number, the position and the size of the step and the arc groove are matched with those of the bending die 2; the front end of the pressing die 5 is provided with a step, the step is provided with a conduit circular arc groove, the number, the position and the size of the step and the circular arc groove are matched with those of the bending die 2, the conduit circular arc groove of the pressing die 5 is a multi-curvature circular groove, the conduit circular arc groove of the bending die 2 is a single-curvature circular groove on a straight line segment, and then the single-curvature circular groove is transited to the multi-curvature circular groove within the range of 15 degrees.

Furthermore, the steps of the integrated step shaft of the bending die 2 are a plurality of layers. The installation and debugging process can be simplified.

Further, the radius of the steps is increased according to the multiple of the diameter d of the conduit; the product standardization is convenient to realize.

Furthermore, arc grooves of the conduits with the same or different pipe diameters are formed in each layer of steps; the product of different pipe diameters can be processed according to the demand in a clamping, improves work efficiency.

And a positioning key 1 and a screw 3 are arranged on a flange at the bottom of the bending die 2 and are used for fixing the bending die 2 on a workbench of a machine tool.

The tail part of the clamping die 4 is provided with a dovetail groove which is connected with a machine tool through the dovetail groove.

The pressing die 5 is provided with a dovetail groove at the tail part and is connected with a machine tool through the dovetail groove.

And the upper part of the pressing die 5 is provided with an adjusting screw 6 for adjusting the height of the pressing die and ensuring that the arc groove of the guide pipe of the pressing die 5 is concentric with the arc groove of the guide pipe of the bending die 2.

Technical effects

The utility model discloses in, the bending die bottom is equipped with the switching flange, fixes the bending die on the lathe workstation through the navigation key and the connecting screw that set up on the flange to give the bending die with the moment of torsion transmission, released the bending die center pin region, made it become the solid partly of frock, be convenient for arrange less diameter pipe and less bend radius's circular arc recess on the bending die, also improved frock intensity. The upper part of the bending die is provided with steps with different bending radiuses, and each layer of step is provided with the same or different pipe diameter guide pipe arc grooves, so that the pipe bending tool is changed into a plurality of cavities, the tool with different pipe diameters and different bending radiuses can be formed in a bending mode, and the good universality is achieved. The arc grooves of the pressing die and the bending die are designed to compensate deformation, so that the quality of the bent pipe is improved.

Drawings

FIG. 1 is a schematic structural diagram of a conventional numerical control pipe bending tool;

FIG. 2 is a schematic structural view of the numerical control pipe bending tool of the utility model;

wherein: 1. positioning key, 2 bending die, 3 connecting screw, 4 clamping die and 5 pressing die

6. Adjusting screw

FIG. 3a is a schematic cross-sectional dimension of a groove of a bend die conduit;

FIG. 3b is a partially enlarged view of the cross-sectional dimension of the groove of the bending die conduit;

FIG. 3c is a schematic side view of the cross-sectional dimension of a groove in a bend die conduit

FIG. 4a is a schematic cross-sectional dimension of a channel of a clamp die conduit;

FIG. 4b is an enlarged partial cross-sectional view of the channel of the clamp die conduit;

FIG. 4c is a schematic side view of the cross-sectional dimension of a channel in a clamp die conduit

FIG. 5a is a schematic cross-sectional dimension of a conduit groove of a die press;

FIG. 5b is an enlarged partial cross-sectional view of the groove of the die guide;

FIG. 5c is a schematic side view of the cross-sectional dimension of the die guide groove;

Detailed Description

The tool is used on a numerical control pipe bending machine and comprises a bending die 2, a clamping die 4 and a pressing die 5, wherein the bending die 2 is an integrated step shaft, and a positioning key 1 and a screw 3 are arranged on a flange at the bottom of the bending die 2 and are used for fixing the bending die 2 on a workbench of a machine tool. The upper part of the bending die 2 is provided with steps with different bending radiuses, the bending radiuses are the same as the bending radiuses required by the forming of the guide pipe, and in order to achieve product standardization and reduce the quantity of pipe bending tools, the bending radiuses are generally designed according to 2d, 3d and 4d of the diameter d of the guide pipe. And arc grooves of the conduits with the same or different pipe diameters are arranged on each layer of steps.

The tail part of the clamping die 4 is provided with a dovetail groove which is connected with a machine tool through the dovetail groove. The front end of the clamping die 4 is provided with a step, the step is provided with a conduit arc groove, the number, the position and the size of the step and the arc groove are matched with those of the bending die 2, and the conduit is compressed when the conduit is bent.

The pressing die 5 is provided with a dovetail groove at the tail part and is connected with a machine tool through the dovetail groove. And the upper part of the bending die is provided with an adjusting screw for adjusting the height of the pressing die and ensuring that the arc-shaped groove of the guide pipe of the pressing die 5 is concentric with the arc-shaped groove of the guide pipe of the bending die 2. The front end of the pressing die 5 is step-shaped, the steps are provided with guide pipe arc grooves, the number, the positions and the sizes of the steps and the arc grooves are matched with those of the bending die 2, and the guide pipe is pressed when the guide pipe is bent.

The circular arc groove of the guide pipe of the pressing die 5 is a multi-curvature circular groove (ellipse), and is shown in figure 4a. The arc groove of the guide pipe of the clamping die 4 is a single-curvature circular groove, and is shown in figure 4b. The arc groove of the pipe of the bending die 2 is a single-curvature circular groove in the size section of fig. 3a, as shown in fig. 4c, and then the single-curvature circular groove is transited to a multi-curvature circular groove within the range of 15 degrees. When the pipe is bent in a numerical control mode, the pipe groove combination of the bending die 2 and the clamping die 4 is round, the section of the pipe part is guaranteed to be unchanged, the pipe groove combination of the bending die 2 and the pressing die 5 is oval, the section of the bent part is consistent with the section of the die when the pipe is bent, the section is changed from the circle to the oval, and the section is changed from the oval after being bent under the influence of resilience, so that the purpose of improving the quality of the pipe is achieved.

When the conduit is bent, the clamping die 4 clamps the conduit with the section A (figures 3a, 3b and 3 c) of the bending die 2, the conduit is pulled to rotate along with the center of the bending die 2, and the bending die 2 and the pressing die 5 keep clamping the conduit all the time in the process, so that the conduit is bent and formed to a required angle. The numerical control pipe bending device pushes the guide pipe forward for a certain distance under the control of a program, rotates for a certain angle, repeats the first action, and completes the bending forming of the whole guide pipe by the circulation reciprocating.

Claims

1. The numerical control bending die with deformation compensation is characterized by comprising a bending die (2), a clamping die (4) and a pressing die (5); the bending die (2) is a one-piece step shaft, and the radius of the step is the same as the bending radius required by the forming of the conduit; the front end of the clamping die (4) is provided with a step, the step is provided with a conduit arc groove, and the number, the position and the size of the step and the arc groove are matched with those of the bending die (2); the front end of the pressing die (5) is provided with a step, the step is provided with a conduit circular arc groove, the step and the number, the position and the size of the circular arc groove are matched with those of the bending die (2), the conduit circular arc groove of the pressing die (5) is a multi-curvature circular groove, the conduit circular arc groove of the bending die (2) is a single-curvature circular groove on a straight line segment, and then the single-curvature circular groove is transited to the multi-curvature circular groove within the range of 15 degrees.

2. The numerical control bending die with deformation compensation as claimed in claim 1, wherein the steps of the one-piece step shaft of the bending die (2) are in a plurality of layers.

3. The digitally controlled pipe bending die with deformation compensation of claim 2, wherein the radius of the plurality of steps increases by a multiple of the conduit diameter d.

4. The numerical control pipe bending die with deformation compensation function according to claim 3, wherein arc grooves of the same or different pipe diameters are formed in each step.

5. The numerical control bending die with deformation compensation as claimed in claim 1, wherein a positioning key (1) and a screw (3) are arranged on a flange at the bottom of the bending die (2) and used for fixing the bending die (2) on a workbench of a machine tool.

6. The numerical control bending die with deformation compensation as claimed in claim 1, wherein the clamping die (4) is provided with a dovetail groove at the tail part and is connected with a machine tool through the dovetail groove.

7. The numerical control bending die with deformation compensation as claimed in claim 1, wherein the die (5) is provided with a dovetail groove at the tail part and is connected with a machine tool through the dovetail groove.

8. The numerical control bending die with deformation compensation of claim 1, wherein an adjusting screw (6) is arranged at the upper part of the pressing die (5) for adjusting the height of the pressing die.