Aluminum alloy pipe expansion device

Abstract

An aluminum alloy tube expanding device. The present invention relates to the technical field of aluminum tube expanding, and in particular to an improvement of an aluminum alloy tube expanding device. An aluminum alloy tube expanding device with a simple structure and easy operation is provided, which improves the degree of automation and product precision. The present invention is an aluminum alloy tube expanding device, which adopts a spinning expanding method to replace the original hydraulic mold expanding method, thereby improving the degree of automation of the equipment and the product precision. The wall thickness of the tube in the expanding area can be controlled by controlling the moving trajectory of the spinning wheel in the X-axis and Y-axis directions, that is, controlling the material flow direction, to achieve equal wall thickness or increased wall thickness of the product, meet the requirements of shell strength performance and arcing performance, and improve product precision. In addition, the expanding fixture is composed of two semicircular molds, and the encirclement is always a full circle. The expanding section and the non-expanding section of the two half molds are integrated. The expanding fixture has high concentricity, thereby ensuring the concentricity of the two ends of the tube after expansion, and further ensuring the quality of the product.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum tube expansion, and in particular to an improvement of an aluminum alloy tube expansion device. Background Art

[0002] In order to reduce the diameter of the GIS / GIL shell for high-voltage power transmission and distribution and reduce the use of sulfur hexafluoride gas, thus saving costs and reducing the risk of environmental pollution, a small-diameter aluminum alloy pipe is required to be used to make the shell. In order to ensure the insulation performance and arcing performance inside the shell, the two ends of the small-diameter pipe need to be expanded with equal wall thickness. Usually, a hydraulic mold is used to expand the ends of the pipe. The wall thickness of the pipe is reduced by about 30% at the expansion point, and the maximum concentricity at the expansion points of both ends is 2mm.

[0003] The State Intellectual Property Office published a Chinese invention patent on March 26, 2019. The patent name is: an aluminum sheath expanding device, announcement number: CN208643888U. It uses a hydraulic press for operation, and no manpower is required during the operation, eliminating safety hazards. The center line of the aluminum tube clamping device is designed to be on the same line as the center line of the vertebral body, and the force is evenly applied during the operation, increasing the accuracy of the results.

[0004] However, the above technical solution has the problems of large wall thickness reduction in the expansion section, which cannot meet the requirements of shell strength and arcing performance; the concentricity error at both ends of the pipe after expansion is large, which causes great difficulties in the subsequent assembly of internal components of the shell and a high product scrap rate. Summary of the invention

[0005] In view of the disadvantages of the existing technology, the present invention provides an aluminum alloy pipe expanding device with simple structure and easy operation, thereby improving the degree of automation and product precision.

[0006] Technical solution of the present invention:

[0007] The invention comprises a base, a spindle drive mechanism, an X-axis drive mechanism, a Y-axis drive mechanism, a spinning wheel and at least one pipe clamping and fixing device; the spindle drive mechanism comprises a spindle box, a motor and a spindle, the spindle is horizontally mounted on the spindle box and connected to the output end of the motor; the X-axis drive mechanism comprises an X-axis motor, an X-axis ball screw and an X-axis drive box, the X-axis ball screw is connected to the X-axis ball screw and the X-axis ball screw is connected to the X-axis ball screw. The output end of the X-axis motor is connected, and the X-axis ball screw is arranged in the X-axis drive box; the Y-axis drive mechanism includes a Y-axis drive box, a Y-axis ball screw and a Y-axis motor, the Y-axis ball screw is connected to the output end of the Y-axis motor, and the Y-axis ball screw is arranged in the Y-axis drive box; the Y-axis drive box is arranged on the base, and a Y-axis guide rail is arranged on the top of the Y-axis drive box, and a Y-axis sliding seat is slidably connected on the Y-axis guide rail, the Y-axis ball screw is transmission-connected with the Y-axis sliding seat, and the Y-axis motor drives the Y-axis sliding seat to move in the Y-axis direction; the spindle box and the motor are respectively arranged on the Y-axis sliding seat, The output end of the spindle is vertically connected to the X-axis drive box, an X-axis guide rail is arranged in the Y-axis direction of the X-axis drive box, an X-axis sliding fixture is slidably arranged on the X-axis guide rail, the X-axis ball screw is transmission-connected with the X-axis sliding fixture, and the X-axis motor drives the X-axis sliding fixture to move in the X-axis direction; a rotating wheel seat is arranged on the X-axis sliding fixture, a spinning wheel is arranged on the rotating wheel seat, and the pipe clamping and fixing device is arranged on the same horizontal line as the base.

[0008] The pipe clamping and fixing device includes a support frame and a flaring fixture, the flaring fixture includes a fixed semicircular mold and a movable semicircular mold, and its inner cavity forms a full circle after being enclosed, the fixed semicircular mold is fixedly installed at one end of the support frame, and the movable semicircular mold is movably connected to the other end of the support frame through a power driving device.

[0009] The power driving device includes a fixed seat, a hydraulic cylinder installed on the fixed seat, a linear guide rail installed on the fixed seat, a connecting plate and a hydraulic rod, the connecting plate is slidably arranged on the linear guide rail, the connecting plate is connected to the back side of the movable semicircular mold, the inner end of the hydraulic rod is connected to the hydraulic cylinder, and the outer end of the hydraulic rod is connected to the connecting plate.

[0010] The fixed semicircular mold and the movable semicircular mold both include a non-expanding section and a expanding section, and the non-expanding section and the expanding section are connected into one body.

[0011] The present invention is an aluminum alloy tube expansion device, which adopts a spinning expansion method to replace the original hydraulic mold expansion method, thereby improving the automation degree of the equipment and the product precision; using an X-axis drive mechanism to drive the spinning wheel to move in the X-axis direction to find the center of the tube to be expanded, and taking the center as the reference point, and then continuously moving in the X-axis direction and the Y-axis direction by the X-axis drive mechanism and the Y-axis drive mechanism to realize interpolation spinning expansion, and can control the wall thickness of the tube in the expansion area by controlling the movement trajectory of the spinning wheel in the X-axis and Y-axis directions, that is, controlling the material flow direction, to achieve equal wall thickness or increased wall thickness of the product, meet the shell strength performance and arcing performance requirements, and improve product precision. In addition, the expansion fixture is composed of two semicircular molds, and the encirclement is always a full circle. The expansion section and the non-expansion section of the two half molds are integrated, and the expansion fixture has high concentricity, thereby ensuring the concentricity of the two ends of the tube after expansion, and further ensuring the quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a stereogram of the present invention;

[0013] Figure 2 It is a schematic diagram of the structure of the present invention;

[0014] Figure 3 yes Figure 2 Right view of;

[0015] Figure 4 is a schematic diagram of the power propulsion device in the present invention;

[0016] Figure 5 is a cross-sectional view of the expansion fixture of the present invention;

[0017] In the figure: 1-base; 2-spinning wheel; 3-spindle drive mechanism; 4-X-axis drive mechanism; 5-Y-axis drive mechanism; 6-tube clamping and fixing mechanism; 7-tube;

[0018] 301-spindle box; 302-motor; 303-spindle;

[0019] 401-X axis motor; 402-X axis ball screw; 403-X axis drive box; 404-X axis guide rail; 405-X axis sliding fixture; 406-rotating wheel seat;

[0020] 501- Y-axis motor; 502- Y-axis ball screw; 503- Y-axis drive box; 504- Y-axis guide rail; 505- Y-axis sliding seat;

[0021] 601-support frame; 602-expansion mold; 603-power driving device; 604-fixing device;

[0022] 6021-fixed semicircular mold; 6022-movable semicircular mold; 6023-expanding section; 6024-non-expanding section. Specific embodiments

[0023] The present invention is further described below in conjunction with the accompanying drawings. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0024] See also Figure 1 — Figure 3 In one embodiment, an aluminum alloy tube flaring device comprises a base 1, a spindle drive mechanism 3, an X-axis drive mechanism 4, a Y-axis drive mechanism 5, a spinning wheel 2 and at least one tube clamping and fixing device 6; the spindle drive mechanism 3 comprises a spindle box 301, a motor 302 and a spindle 303, the spindle 303 is horizontally mounted on the spindle box 301 and connected to the output end of the motor 302; the X-axis drive mechanism 4 comprises an X-axis motor 401, an X-axis ball screw 402 and an X-axis drive box 403, the X-axis ball screw 402 is connected to the X The output end of the X-axis motor 401 is connected, and the X-axis ball screw 402 is arranged in the X-axis drive box 403; the Y-axis drive mechanism 5 includes a Y-axis drive box 503, a Y-axis ball screw 502 and a Y-axis motor 501, the Y-axis ball screw 502 is connected to the output end of the Y-axis motor 501, and the Y-axis ball screw 502 is arranged in the Y-axis drive box 503; the Y-axis drive box 503 is arranged on the base 1, and the top of the Y-axis drive box 503 is arranged with a Y-axis guide rail 504, the Y-axis guide rail 504 is slidably connected with a Y-axis sliding seat 505, the Y-axis ball screw 502 is transmission-connected with the Y-axis sliding seat 505, and the Y-axis motor 501 drives the Y-axis sliding seat 505 to move in the Y-axis direction; the spindle box 301 and the motor 302 are respectively arranged on the Y-axis sliding seat 505, The output end of the spindle 303 is vertically connected to the X-axis driving box 403, an X-axis guide rail 404 is arranged in the Y-axis direction of the X-axis driving box 403, an X-axis sliding fixture 405 is slidably arranged on the X-axis guide rail 404, the X-axis ball screw 402 is transmission-connected with the X-axis sliding fixture 405, and the X-axis motor 401 drives the X-axis sliding fixture 405 to move in the X-axis direction; a rotating wheel seat 406 is arranged on the X-axis sliding fixture 405, a spinning wheel 2 is arranged on the rotating wheel seat 406, and the pipe clamping and fixing device 6 is arranged on the same horizontal line as the base 1.

[0025] The pipe clamping and fixing device 6 is used to fix the pipe 7 , and the center line of the pipe 7 on the pipe clamping and fixing device 6 is at the same height as the center line of the spinning wheel 2 .

[0026] The aluminum alloy tube expansion device described in the present invention includes a main shaft and two feed shafts. When the device is in operation, the X-axis driving mechanism 4 drives the X-axis sliding fixture 405 to drive the spinning wheel 2 to find the center of the tube 7 to be expanded, and the center is used as the reference point. During spinning, the X-axis driving mechanism 4 drives the X-axis sliding fixture 405 to drive the spinning wheel 2 to operate uninterruptedly in the X-axis direction, and the Y-axis driving mechanism 5 drives the spindle box 3 to drive the spinning wheel 2 to move forward and backward in the Y-axis direction to achieve interpolation spinning. By controlling the material flow direction, the wall thickness of the tube in the expansion area is controlled, thereby ensuring the equal wall thickness or increased wall thickness of the tube, meeting the shell strength performance and arcing performance requirements. The above-mentioned driving mechanisms are all connected to the control system, and instructions are given by the control system for processing, thereby improving product precision.

[0027] See also Figure 1 The pipe clamping and fixing device 6 includes a support frame 601 and a flaring fixture 602. The flaring fixture 602 includes a fixed semicircular mold 6021 and a movable semicircular mold 6022, and its inner cavity forms a whole circle after being enclosed. The fixed semicircular mold 6021 is fixedly installed at one end of the support frame 601, and the movable semicircular mold 6022 is movably connected to the other end of the support frame 601 through a power driving device 603.

[0028] See also Figure 4 , wherein the power driving device 603 includes a fixed seat 6031, a hydraulic cylinder 6032 installed on the fixed seat 6031, a linear guide rail 6033 installed on the fixed seat 6031, a connecting plate 6034 and a hydraulic rod 6035, the connecting plate 6034 is slidably set on the linear guide rail 6033, the connecting plate 6034 is connected to the back side of the movable semicircular mold 6022, the inner end of the hydraulic rod 6035 is connected to the hydraulic cylinder 6032, and the outer end of the hydraulic rod 6035 is connected to the connecting plate 6034.

[0029] The pipe 7 to be expanded is clamped on the pipe clamping and fixing mechanism 6, and the movable semicircular mold 6022 is pushed by the hydraulic cylinder 6032 and guided by the linear guide 6033. The rodless cavity of the hydraulic cylinder 6032 is always supplied with oil during the spinning process, ensuring that the two halves of the mold are always a full circle after being assembled, and the inner diameter of the fixed semicircular mold 6021 and the movable semicircular mold 6022 after being enclosed is adapted to the outer diameter of the pipe 7.

[0030] In addition, the fixed installation measures of the fixed semicircular mold 6021 can be found in Figure 1The fixing device 604 shown in the figure comprises a fixing seat 6031 and a connecting plate 6034. The back of the fixed semicircular mold 6021 is connected to the connecting plate 6034. The connecting plate 6034 is connected to the fixing seat 6031 through a connecting rod, so that the fixed semicircular mold 6021 is fixedly installed on one end of the support frame 601. The fixed semicircular mold can also be fixedly installed by conventional means in the technical field, and is not limited to this embodiment.

[0031] refer to Figure 5 , wherein the fixed semicircular mold 6021 and the movable semicircular mold 6022 both include a non-expanding section 6023 and a expanding section 6024, and the non-expanding section 6023 and the expanding section 6024 are connected as a whole.

[0032] The expansion fixture 602 is manufactured by CNC lathe molding through one-time clamping, and is cut by 0.1-0.12mm molybdenum wire with wire cutting, which not only ensures that the roundness of the parent material is not damaged, but also ensures the concentricity of the non-expanded section 6023 and the expanded section 6024. At the same time, the concentricity of the expanded ends of the pipe cannot be guaranteed, which brings convenience to the subsequent assembly of the internal components of the shell and reduces the scrap rate of the product.

[0033] The working steps of the aluminum alloy tube expanding device of the present invention are as follows:

[0034] First, the pipe 7 to be expanded is installed on the pipe clamping and fixing mechanism 6, and the expansion fixture 602 clamps the pipe 7 to be expanded and fixes it on the support frame 601, and the spinning wheel 2 is in the initial state; the X-axis drive mechanism 4 works to drive the spinning wheel 2 to find the center of the pipe 7 to be expanded, and this center is used as the reference point; during spinning, the X-axis drive mechanism 4 operates uninterruptedly, and at the same time, the Y-axis drive mechanism 5 drives the spin wheel 2 to move in the Y-axis direction close to the expanded part of the pipe to be expanded, and then the spinning wheel 2 is driven by the X-axis drive mechanism 4 and the Y-axis drive mechanism 5 to perform spinning expansion until the expansion reaches the qualified size. After the expansion of the pipe to be expanded is completed, the Y-axis drive mechanism 5 stops running, and the Y-axis drive mechanism 5 drives the spinning wheel 2 to move away from the expanded part of the pipe 7 to be expanded in the Y-axis direction, and at the same time, the spindle drive mechanism 3 stops rotating, and the spinning wheel returns to the initial position, and the expanded pipe 7 is removed.

[0035] In the aluminum alloy tube expanding device of the present invention, the control system controls each driving mechanism, thereby accurately controlling the trajectory of the spinning wheel 2 in the X-axis and Y-axis directions, ensuring that the tube thickness at the expanded portion is equal to or greater than the original tube wall thickness, thereby ensuring the product performance and product accuracy.

[0036] The present invention is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed in the present invention, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present invention.

Claims

1. An aluminum alloy tube expansion device, characterized in that: It includes a base, a spindle drive mechanism, an X-axis drive mechanism, a Y-axis drive mechanism, a spinning wheel and at least one pipe clamping and fixing device; Wherein, the spindle drive mechanism includes a spindle box, a motor and a spindle, the spindle is horizontally mounted on the spindle box and connected to the output end of the motor; the X-axis drive mechanism includes an X-axis motor, an X-axis ball screw and an X-axis drive box, the X-axis ball screw is connected to the output end of the X-axis motor, and the X-axis ball screw is arranged in the X-axis drive box; The Y-axis driving mechanism comprises a Y-axis driving box, a Y-axis ball screw and a Y-axis motor, wherein the Y-axis ball screw is connected to the output end of the Y-axis motor, and the Y-axis ball screw is arranged in the Y-axis driving box; The Y-axis driving box is arranged on the base, and a Y-axis guide rail is arranged on the top of the Y-axis driving box. The Y-axis guide rail is slidably connected to the Y-axis sliding seat, and the Y-axis ball screw is transmission-connected to the Y-axis sliding seat, and the Y-axis motor drives the Y-axis sliding seat to move in the Y-axis direction; the spindle box and the motor are respectively arranged on the Y-axis sliding seat, and the output end of the spindle is vertically connected to the X-axis driving box, the X-axis guide rail is arranged on the X-axis driving box, and an X-axis sliding fixture is slidably arranged on the X-axis guide rail, the X-axis ball screw is transmission-connected to the X-axis sliding fixture, and the X-axis motor drives the X-axis sliding fixture to move in the X-axis direction; a rotating wheel seat is arranged on the X-axis sliding fixture, and a spinning wheel is arranged on the rotating wheel seat, and the pipe clamping and fixing device is arranged on the same horizontal line as the base; The pipe clamping and fixing device comprises a support frame and a flaring fixture, the flaring fixture comprises a fixed semicircular mold and a movable semicircular mold, and the inner cavity thereof forms a full circle after being enclosed, the fixed semicircular mold is fixedly mounted on one end of the support frame, and the movable semicircular mold is movably connected to the other end of the support frame through a power driving device; The fixed semicircular mold and the movable semicircular mold both include a non-expanding section and a expanding section, and the non-expanding section and the expanding section are connected as one body; During operation, the X-axis driving mechanism drives the X-axis sliding fixture to drive the spinning wheel to find the center of the pipe to be expanded, and takes this center as the reference point. During spinning, the X-axis driving mechanism drives the X-axis sliding fixture to drive the spinning wheel to operate continuously in the X-axis direction, and the Y-axis driving mechanism drives the spindle box to drive the spinning wheel to move back and forth in the Y-axis direction to realize interpolation spinning, and the wall thickness of the pipe in the expansion area is controlled by controlling the material flow direction.

2. The aluminum alloy tube expanding device according to claim 1, characterized in that: The power driving device includes a fixed seat, a hydraulic cylinder installed on the fixed seat, a linear guide rail installed on the fixed seat, a connecting plate and a hydraulic rod, the connecting plate is slidably arranged on the linear guide rail, the connecting plate is connected to the back side of the movable semicircular mold, the inner end of the hydraulic rod is connected to the hydraulic cylinder, and the outer end of the hydraulic rod is connected to the connecting plate.

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