Pipe forming method and pipe thereof

Abstract

The invention relates to a pipe forming method and a pipe thereof, which comprises the following steps of: turning a blank to form a pipe, and respectively deforming a first side surface and a second side surface of the pipe by utilizing a first forging mode and a second forging mode so as to obtain a two-section type deformed pipe finished product. According to the invention, the crystal structure of the pipe finished product is not damaged in a forging manner, so that the structural strength of the pipe finished product can be improved, the size accuracy of the pipe finished product can be improved, the material cost is further reduced, and the process efficiency is improved.

Description

Technical Field

[0001] The present invention relates to a method for forming a pipe and the pipe, in particular to a method for forging and forming the pipe through an upper forming die and a lower forming die and the pipe. Background Art

[0002] See also Figures 11 to 14 , a method for forging and drawing thick and thin pipe fittings is commonly used:

[0003] Step A, firstly, a hollow columnar raw material is processed into a blank material 1, and the blank material is extended along the axis to form a first side surface 2, a second side surface 3 along the axis opposite to the first side surface 2, and an outer peripheral surface 4 connecting the first side surface 2 and the second side surface 3, and the blank material 1 has a through groove 5 inside.

[0004] Step B: Perform the first tube drawing. Place the blank 1 in the forging and drawing die 6, and extend the forging and drawing head 7 into the through groove 5 of the blank 1 to apply force and pressure, so that the second side surface 3 and the outer peripheral surface 4 produce the first stage of deformation. At this time, the diameter of the second side surface 3 and the outer peripheral surface 4 is smaller than the diameter of the first side surface 2.

[0005] Step C: pulling out the forging tap 7 for the first time to separate the forging tap 7 from the through groove 5 of the blank 1.

[0006] Step D: Perform the second tube drawing. Place the blank 1 in the forging and drawing die 6, and extend the forging and drawing head 7 into the through groove 5 of the blank 1 to apply force and pressure, so that the first side surface 2 undergoes the second stage of deformation. At this time, the diameters of the first side surface 2, the second side surface 3 and the outer peripheral surface 4 are the same, and the outer diameters of the first side surface 2 and the second side surface 3 are greater than the outer diameter of the outer peripheral surface 4.

[0007] Step E: Pull out the forged tap 7 for the second time, so that the forged tap 7 is separated from the through groove 5 of the blank 1, so as to form a finished product of a thick or thin pipe 8.

[0008] Although the finished product can be obtained by forging and drawing by the above method, since the original thickness and hardness of each blank material 1 are slightly different, the length of the first side surface 2 will be inaccurate when the forging tap 7 is drawn out for the second time, and the crystal structure of the blank material 1 is easily destroyed during the forging and drawing operation, resulting in the disadvantage of poor strength.

[0009] In order to overcome the shortcomings of the conventional solutions, the inventors have actively considered, prototyped and improved, and developed a method for forming a tube and an improved solution for the finished product, which can completely solve or effectively improve many of the shortcomings of the conventional solutions. Summary of the invention

[0010] The object of the present invention is to provide a method for forming a tube and a tube thereof, which can overcome the defects of the prior art, and can increase the structural strength of the finished tube by forging without damaging the crystal structure of the finished tube, and can improve the accuracy of the size of the finished tube, thereby reducing material costs and improving process efficiency.

[0011] To achieve the above object, the present invention discloses a method for forming a tube, which is characterized by comprising the following steps:

[0012] Step 1: a blank is turned into a tube, wherein a center hole is provided in the center of the tube, the tube has a first side surface and a second side surface which are oppositely arranged, an outer peripheral surface is connected between the first side surface and the second side surface, the first side surface has a first diameter, the second side surface has a second diameter, the outer peripheral surface has a third diameter, the first diameter is equal to the second diameter and is larger than the third diameter;

[0013] Step 2: preparing the tube after turning and a forming device, the forming device comprising a mandrel, an upper forming die and a lower forming die, one end of the mandrel having a through-drawing portion of equal diameter;

[0014] Step 3: The extending portion of the mandrel is extended into the central hole of the tube, and the first side surface and the second side surface of the tube are placed between the upper forming die and the lower forming die, so that the upper forming die and the lower forming die are respectively located above and below the tube;

[0015] Step 4: Then forging the first side surface of the tube to cause the first side surface of the tube to produce a first stage of deformation, so that the first diameter is equal to the third diameter and both are smaller than the second diameter, and then pulling out the mandrel to separate the penetration portion from the center hole of the tube;

[0016] Step 5: Re-extending the extending portion of the mandrel into the central hole of the tube, and placing the first side surface and the second side surface of the tube between the upper forming die and the lower forming die, so that the upper forming die and the lower forming die are respectively located above and below the tube;

[0017] Step 6: Then forge the second side surface of the tube to cause the second side surface of the tube to produce a second stage of deformation, so that the second diameter is equal to the first diameter and the third diameter, and then pull out the core rod to make the extension portion separate from the center hole of the tube, thus completing a finished tube product.

[0018] The pipe is a seamless, integrally formed hollow cylindrical pipe.

[0019] Wherein, a core rod fixing block is arranged on the core rod, and the core rod fixing block is used for stopping the pipe material so that the pipe material can be separated from the core rod.

[0020] Also disclosed is a pipe, characterized in that it comprises:

[0021] A finished pipe product, the center of which is provided with a center hole, the finished pipe product has a first side surface and a second side surface which are arranged opposite to each other, an outer peripheral surface is connected between the first side surface and the second side surface, the first side surface has a first diameter, the first diameter includes a first outer diameter and a first inner diameter, the second side surface has a second diameter, the second diameter includes a second outer diameter and a second inner diameter, the outer peripheral surface has a third diameter, the third diameter includes a third outer diameter and a third inner diameter, the first diameter is equal to the second diameter and the third diameter, and the first outer diameter is equal to the second outer diameter and is larger than the third outer diameter, so that the first inner diameter is equal to the second inner diameter and is smaller than the third inner diameter.

[0022] According to the above method, the present invention can utilize the first forging and the second forging to deform the first side and the second side of the tube respectively, so as to obtain the tube product with two-stage deformation. Therefore, the present invention can prevent the crystal structure of the tube product from being destroyed by forging, increase its structural strength, and improve the accuracy of the size of the tube product, thereby reducing material costs and improving process efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The figure is a flowchart of a preferred embodiment of the present invention.

[0024] Figure 2 This is a cross-sectional view of a tube after turning according to a preferred embodiment of the present invention.

[0025] Figure 3 It is a three-dimensional diagram of a pipe and a forming device according to a preferred embodiment of the present invention.

[0026] Figure 4 This is a cross-sectional view of a pipe placed in a forming device before the first forging in a preferred embodiment of the present invention.

[0027] Figure 5 This is a cross-sectional view of a tube after forging the first side surface of a preferred embodiment of the present invention.

[0028] Figure 6 This is a cross-sectional view of the mandrel of the preferred embodiment of the present invention when it is pulled out of the tube for the first time.

[0029] Figure 7 This is a cross-sectional view of a pipe placed in a forming device before the second forging in a preferred embodiment of the present invention.

[0030] Figure 8 This is a cross-sectional view of a tube after forging the second side surface of a preferred embodiment of the present invention.

[0031] Fig. 9 This is a cross-sectional view of the mandrel being pulled out of the tube for the second time according to a preferred embodiment of the present invention.

[0032] Fig.10 It is a cross-sectional view of a finished pipe product according to a preferred embodiment of the present invention.

[0033] Fig.11 This is a cross-sectional view of the first extraction of a conventional pipe.

[0034] Fig.12 It is a cross-sectional view of a conventional pipe exiting a forging die.

[0035] Fig.13 This is a cross-sectional view of the second extraction of conventional pipes.

[0036] Fig.14 It is a cross-sectional view of a conventional rear thin pipe. DETAILED DESCRIPTION

[0037] See also Figures 1 to 3 As shown, the present invention discloses a method for forming a tube, which comprises the following steps:

[0038] Step 1 S1: a blank material 10 is turned into a tube material 11. The tube material 11 is a seamless and integrally formed hollow cylindrical tube body. A center hole 111 is provided at the center of the tube material 11. The tube material 11 has a first side surface 12 and a second side surface 13 which are arranged opposite to each other. An outer peripheral surface 14 is connected between the first side surface 12 and the second side surface 13. Preferably, the thickness of the first side surface 12 and the second side surface 13 are both greater than the thickness of the outer peripheral surface 14. The first side surface 12 has a first diameter D1, the second side surface 13 has a second diameter D2, and the outer peripheral surface 14 has a third diameter D3. The first diameter D1 is equal to the second diameter D2, and both are greater than the third diameter D3.

[0039] Step 2 S2: Matching reference Figure 4 , prepare the tube 11 after turning and a forming device 20, the forming device 20 includes a core rod 21, an upper forming die 22 and a lower forming die 23, the core rod 21 is provided with a core rod fixing block 211, and one end of the core rod 21 has a penetration portion 212 of equal diameter.

[0040] Step three S3: The extending portion 212 of the core rod 21 is extended to the central hole 111 of the tube 11, and the first side surface 12 and the second side surface 13 of the tube 11 are placed between the upper molding die 22 and the lower molding die 23, so that the upper molding die 22 and the lower molding die 23 are respectively located above and below the tube 11.

[0041] Step 4 S4: Matching reference Figure 5 and Figure 6 , then the first side surface 12 of the tube 11 is forged to cause the first stage of deformation of the first side surface 12 of the tube 11, so that the first diameter D1 is equal to the third diameter D3 and both are smaller than the second diameter D2, and then the core rod 21 is pulled out to make the penetration portion 212 detach from the center hole 111 of the tube 11, and the first side surface 12 of the tube 11 will be blocked by the core rod fixing block 211 and can be separated from the core rod 21.

[0042] Step 5 S5: Matching reference Figure 7 , the extending portion 212 of the core rod 21 is re-extended into the central hole 111 of the tube 11, and the first side surface 12 and the second side surface 13 of the tube 11 are placed between the upper forming die 22 and the lower forming die 23, so that the upper forming die 22 and the lower forming die 23 are respectively located above and below the tube 11.

[0043] Step 6 S6: Matching reference Figures 8 to 10 , then the second side surface 13 of the tube 11 is forged to cause the second side surface 13 of the tube 11 to undergo a second stage of deformation, so that the second diameter D1 is equal to the first diameter D1 and the third diameter D3, and then the core rod 21 is pulled out to allow the extending portion 212 to be separated from the center hole 111 of the tube 11, and the second side surface 13 of the tube 11 is stopped by the core rod fixing block 211 and can be separated from the core rod 21, thereby completing a finished tube 110.

[0044] Thus, the pipe manufactured by the method of the present invention comprises the finished pipe 110, wherein a center hole 111 is provided at the center thereof, the finished pipe 110 comprises a first side surface 12 and a second side surface 13 which are arranged opposite to each other, an outer peripheral surface 14 is connected between the first side surface 12 and the second side surface 13, the first side surface 12 has a first diameter D1, the first diameter D1 comprises a first outer diameter D11 and a first inner diameter D12, the second side surface 13 has a second diameter D2, and the The second diameter D2 includes a second outer diameter D21 and a second inner diameter D22, the outer peripheral surface 14 has a third diameter D3, the third diameter D3 includes a third outer diameter D31 and a third inner diameter D32, the first diameter D1 is equal to the second diameter D2 and the third diameter D3, and the first outer diameter D11 is equal to the second outer diameter D21 and is larger than the third outer diameter D31, so that the first inner diameter D12 is equal to the second inner diameter D22 and is smaller than the third inner diameter D32.

[0045] According to the above method, the first side surface 12 and the second side surface 13 of the tube 11 are deformed respectively by the first forging and the second forging, so as to obtain the tube product 110 with two-stage deformation. Therefore, the present invention can prevent the crystal structure of the tube product 110 from being destroyed by forging, thereby increasing its structural strength and improving the dimensional accuracy of the tube product 110, thereby reducing material costs and improving process efficiency.

Claims

1. A method for forming a tube, characterized in that It includes the following steps: Step 1: a blank is turned into a tube, wherein a center hole is provided in the center of the tube, the tube has a first side surface and a second side surface which are oppositely arranged, an outer peripheral surface is connected between the first side surface and the second side surface, the first side surface has a first diameter, the second side surface has a second diameter, the outer peripheral surface has a third diameter, the first diameter is equal to the second diameter and is larger than the third diameter; Step 2: preparing the tube after turning and a forming device, the forming device comprising a mandrel, an upper forming die and a lower forming die, one end of the mandrel having a through-drawing portion of equal diameter; Step 3: The extending portion of the mandrel is extended into the central hole of the tube, and the first side surface and the second side surface of the tube are placed between the upper forming die and the lower forming die, so that the upper forming die and the lower forming die are respectively located above and below the tube; Step 4: Then forging the first side surface of the tube to cause the first side surface of the tube to produce a first stage of deformation, so that the first diameter is equal to the third diameter and both are smaller than the second diameter, and then pulling out the mandrel to separate the penetration portion from the center hole of the tube; Step 5: Re-extending the extending portion of the mandrel into the central hole of the tube, and placing the first side surface and the second side surface of the tube between the upper forming die and the lower forming die, so that the upper forming die and the lower forming die are respectively located above and below the tube; Step 6: Then forge the second side surface of the tube to cause the second side surface of the tube to produce a second stage of deformation, so that the second diameter is equal to the first diameter and the third diameter, and then pull out the core rod to make the extension portion separate from the center hole of the tube, thus completing a finished tube product.

2. The method for forming a tube according to claim 1, characterized in that: The pipe is a seamless, integrally formed hollow cylindrical pipe.

3. The method for forming a tube according to claim 1, characterized in that: A core rod fixing block is arranged on the core rod, and the core rod fixing block is used for stopping the pipe material so that the pipe material can be separated from the core rod.

4. A pipe, characterized in that Include: A finished pipe product, the center of which is provided with a center hole, the finished pipe product has a first side surface and a second side surface which are arranged opposite to each other, an outer peripheral surface is connected between the first side surface and the second side surface, the first side surface has a first diameter, the first diameter includes a first outer diameter and a first inner diameter, the second side surface has a second diameter, the second diameter includes a second outer diameter and a second inner diameter, the outer peripheral surface has a third diameter, the third diameter includes a third outer diameter and a third inner diameter, the first diameter is equal to the second diameter and the third diameter, and the first outer diameter is equal to the second outer diameter and is larger than the third outer diameter, so that the first inner diameter is equal to the second inner diameter and is smaller than the third inner diameter.

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