Distance fixing device for inner diameter of bent center during bending machining of titanium bent pipe

Abstract

The utility model discloses a distance fixing device for the inner diameter of a bent center during bending processing of a titanium bent pipe, which is arranged in a straight pipe of a formed bent pipe in a sliding and penetrating manner, is attached to the inner wall of the straight pipe and can be bent along with the straight pipe in the process that the straight pipe is bent and deformed to be bent. The distance fixing device is composed of a plurality of distance fixing columns which are hinged at intervals and attached to the inner wall of the straight pipe in a sliding mode, a driving pull rope extending to the outside of the straight pipe is connected to the distance fixing columns on the outer side, and positioning cover bodies which are larger than the outer diameter of the straight pipe are tightly arranged on the two sides of the driving pull rope in a sleeving mode. The distance fixing device can be arranged in a straight pipe in a penetrating mode and is bent along with the straight pipe to form a bent pipe. When the bent pipe is formed, the distance fixing device can support the inner wall of a straight pipe (especially the bent center of the formed bent pipe), so that the concave deformation at the bent center of the bent pipe can be resisted, the problem that the concave defect is easily formed at the bent center after the bent pipe is formed is solved, and the inner diameter of the bent center of the bent pipe is effectively guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of titanium pipe bending and forming, and in particular to a distance device for determining the inner diameter of a bending center during the bending process of a titanium pipe. Background Art

[0002] Titanium is a lightweight, high-strength and corrosion-resistant metal element, which is widely used in aviation, medical, chemical and other fields. For example, it is used to manufacture aircraft structures and engine parts, titanium artificial joints, dental implants and other medical equipment, chemical equipment and pipelines, bicycle frames and other high-performance products.

[0003] When making titanium pipes, like other metals, they need to be made into a curved pipe shape (such as an elbow) to suit the direction and connection of the pipe. Compared with traditional carbon steel elbows, titanium elbows have longer service life and better corrosion resistance. Therefore, titanium elbows are a better choice in some occasions that require long-term use or have high requirements for pipeline systems.

[0004] Due to the high strength of titanium, its tube wall is thinner than other metals to save materials. In the process of bending a titanium straight tube (usually by a tube bender) into a curved tube, the thinner tube wall is squeezed on both sides at the inner side of the tube body (see the instruction manual). Figure 3 The middle arrow indicates the effect), which will cause a concave deformation defect at the bend center ( Figure 3 The inner diameter of the pipe body at the bend center of the elbow will be affected, which will further affect the flow rate of the fluid in the pipe body, and the concave defect is difficult to be effectively repaired later. Summary of the invention

[0005] In response to the above-mentioned problems, the present application aims to provide a spacing device for the inner diameter of the bend center during the bending process of titanium elbow, which can effectively resist the concave deformation at the bend center of the elbow, thereby solving the problem of concave defects easily formed at the bend center after the elbow is formed, and effectively ensuring the inner diameter of the bend center of the elbow.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted in this application is as follows: a distance device for the inner diameter of the bend center during the bending process of a titanium bend tube, characterized in that: the distance device is slidably inserted into the straight tube of the formed bend tube, and the distance device is in contact with the inner wall of the straight tube, and in the process of the straight tube bending and deforming into a bent tube, the distance device bends along with the straight tube.

[0007] Preferably, the distance device is composed of a plurality of distance columns hinged at intervals and slidingly attached to the inner wall of the straight tube.

[0008] Preferably, a driving rope extending to the outside of the straight tube is connected to the outer distance column.

[0009] Preferably, a positioning cover body whose diameter is larger than the outer diameter of the straight tube is tightly sleeved on both sides of the driving pull rope.

[0010] Preferably, the outer end surface of each of the distance cylinders is arranged to have an arc chamfered structure.

[0011] The beneficial effect of the present application is that the distance device can be inserted into a straight pipe and bend the straight pipe to form a curved pipe at the same time. When the curved pipe is formed, the distance device can support the inner wall of the straight pipe (especially the bend center of the formed curved pipe), thereby resisting the concave deformation at the bend center of the curved pipe, thereby solving the problem of the concave defect easily formed at the bend center after the curved pipe is formed, and effectively ensuring the inner diameter of the bend center of the curved pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a straight pipe structure diagram.

[0013] Figure 2 The diagram is a diagram of a pipe bending structure for bending a straight pipe into a shape.

[0014] Figure 3 for Figure 2 The enlarged structural diagram at point A in the middle (the concave diagram at the center of the elbow).

[0015] Figure 4 This is a diagram of the structure of the distance device of this application.

[0016] Figure 5 For this application, the distance device is installed in the straight pipe as shown in the figure.

[0017] Figure 6 For this application Figure 5 Enlarged view of the structure at point B in the middle.

[0018] Figure 7 For this application Figure 5 Illustration of a straight pipe being bent into an elbow.

[0019] Figure 8 For this application Figure 7 Enlarged view of the structure at point C in the middle. DETAILED DESCRIPTION

[0020] In order to enable ordinary technicians in the field to better understand the technical solution of the present application, the technical solution of the present application is further described below in conjunction with the accompanying drawings and embodiments.

[0021] See attached Figures 1 to 8The distance device for the inner diameter of the bend center during the bending process of a titanium bend tube shown solves the problem of the concave defect at the bend center of the current titanium bend tube after bending. Specifically, the distance device is slidably inserted into the straight tube 1 of the formed bend tube 2, and the distance device is in contact with the inner wall of the straight tube 1, and in the process of the straight tube 1 bending and deforming to the bend tube 2, the distance device bends with the straight tube 1. When the bend tube is formed, the distance device is inserted into the inner wall of the straight tube 1 and is located at the bend center after the bend tube is formed, and then the straight tube 1 is placed on the tube bending machine for bend forming. During the bending forming process, since the distance device is in contact with the inner wall of the straight tube and can bend synchronously with the bending of the straight tube, the distance device can resist the concave deformation at the bend center of the bend tube, thereby solving the problem of the easy formation of concave defects at the bend center after the bend tube is formed, and effectively guaranteeing the inner diameter of the bend center of the bend tube. At the same time, the distance device can bend synchronously with the bending of the straight pipe 1, thereby not interfering with the curvature of the curved pipe. In addition, since the distance device is in sliding contact with the straight pipe 1 and the inner wall of the curved pipe 2 after bending, the distance device can be slid out of the curved pipe after the curved pipe is bent to achieve disassembly.

[0022] Specifically, Figure 4 As shown, the distance device is composed of a plurality of distance columns 3 which are hinged at intervals and slide against the inner wall of the straight pipe 1. Before the bending pipe is formed, the distance columns 3 connected in a string are inserted into the straight pipe 1 and located at the bend center of the bending pipe ( Figure 5 As shown), the straight tube 1 is then bent by a tube bender. During the bending process, since the adjacent distance columns 3 are hinged structures, they can be bent with the straight tube 1 at any arc ( Figure 7 As shown), the bending portion of the straight tube 1 is interfered with. During the bending process, the distance column 3 is used to contact and distance the inner wall at the center of the bend ( Figure 8 After the curved tube is bent and formed, the distance column 3 can be slid out from one end of the curved tube 2 to realize disassembly.

[0023] In order to realize the bending and forming of pipes of different lengths, preferably, adjacent distance columns 3 are detachably hingedly connected and can be assembled into different lengths. Usually, the distance columns 3 only act at the bend center of the bend to resist the concave deformation, so usually 2-3 distance columns 3 are connected.

[0024] In order to facilitate the installation of the distance column 3 in the straight pipe 1 and to smoothly pull it out after the bent pipe is formed, Figure 4 , 7As shown, a driving pull rope 4 extending to the outside of the straight pipe 1 is connected to the outer distance column 3. When inserting, the driving pull rope 4 on one side is passed through the straight pipe 1, and the distance column 3 is pulled by the pull rope passing through the straight pipe 1 to quickly insert into the straight pipe 1 and be located at the bend center of the curved pipe 2. After the curved pipe is bent, the distance column 3 can be smoothly pulled out of the curved pipe 2 through the driving pull rope 4. After the curved pipe 2 is bent, its inner wall, especially the bend center, is a curved surface structure. In order to facilitate the smooth pulling out of the distance column 3, the distance column 3 can be set to a narrower width to solve the large interference caused by the curved surface at the bend center of the inner wall of the curved pipe on its sliding disassembly.

[0025] To avoid displacement of the straight tube 1 during bending, Figure 7 As shown, a positioning cover 5 having a diameter larger than the outer diameter of the straight tube 1 is tightly sleeved on both sides of the driving rope 4. Preferably, the perforation of the positioning cover 5 is smaller than the outer diameter of the driving rope 4, so that the positioning cover 5 can be positioned on the driving rope 4. When a large external force is applied to the positioning cover 5, the friction resistance between the perforation and the driving rope 4 can be overcome, so that the positioning cover 5 can be displaced on the driving rope 4. Therefore, after the positioning column 3 is inserted into the straight tube 1 and is located at the bend center of the curved tube 2, the positioning cover 5 is driven to displace on the driving rope 4 until it contacts the port of the straight tube 1, thereby effectively limiting the displacement problem of the spacing column 3 in the tube body during the bending process of the straight tube.

[0026] In order to further reduce the resistance when the distance column 3 is pulled out after the bending tube is formed, it is preferred that Figure 8 As shown, the outer end surface of each of the distance cylinders 3 is set to a circular arc chamfer structure. This structure can effectively reduce the resistance of the side end of each distance cylinder 3 in sliding contact with the inner wall of the curved pipe, making it easier to pull out the distance cylinder 3. Although the center of the curved pipe 2 can be deformed inward by the distance cylinder 3 during the bending process, the side wall of the curved pipe still has a tendency to be concave. Therefore, when the distance cylinder 3 is pulled to be disassembled, it slides in contact with the center of the curved pipe inner wall, which can effectively correct the smaller concave deformation under the concave trend. Then, when the distance cylinder 3 is pulled to be disassembled by external force, it can also smoothly trim the curvature of the curved pipe inner wall at the center of the curved pipe, thereby improving the smoothness of the inner wall at the center of the curved pipe.

[0027] The principle of the present application is: before the bending tube is formed, the driving rope 4 on one side of the distance columns 3 connected in a string is passed through the straight tube 1, and the distance columns 3 are pulled by the rope passing through the straight tube 1 to quickly pass through the straight tube 1 and be located at the bend center of the bent tube 2; then the positioning cover 5 is driven to shift on the driving rope 4 to contact the end of the straight tube 1, so as to realize the positioning of the distance columns 3 in the straight tube, and then the straight tube is placed on the tube bending machine for bending. During the bending process, the adjacent distance columns 3 are synchronously hinged and rotated along with the bending of the straight tube, and after the bent tube is bent, the distance columns 3 can be smoothly pulled out of the bent tube 2 by the driving rope 4 for disassembly.

[0028] The above shows and describes the basic principles, main features and advantages of the present application. Without departing from the spirit and scope of the present application, the present application may have various changes and improvements, which fall within the scope of the present application to be protected.

Claims

1. A device for determining the inner diameter of the bending center during the bending process of a titanium pipe, characterized in that: The distance device is slidably arranged in the straight tube (1) of the formed curved tube (2), and the distance device is in contact with the inner wall of the straight tube (1), and in the process of the straight tube (1) bending and deforming into the curved tube (2), the distance device bends along with the straight tube (1).

2. The distance device for the inner diameter of the bending center according to claim 1, characterized in that: The distance device is composed of a plurality of distance columns (3) which are hinged at intervals and slide against the inner wall of the straight tube (1).

3. The distance device for the inner diameter of the bending center according to claim 2, characterized in that: The outer distance column (3) is connected to a driving pull rope (4) extending to the outside of the straight tube (1).

4. The distance device for the inner diameter of the bending center according to claim 3, characterized in that: Positioning covers (5) having a diameter greater than the outer diameter of the straight tube (1) are tightly sleeved on both sides of the driving pull rope (4).

5. The distance device for the inner diameter of the bending center according to claim 4, characterized in that: The outer end surface of each of the distance columns (3) is arranged as a circular arc chamfered structure.

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