Hydraulic roll forming method for pipe joint raised head

Abstract

The invention discloses a pipe joint raised head hydraulic roll forming method which comprises the following steps: (1) fixing a die on a three-jaw chuck of a lathe, (2) extending one end of a metal pipe, which needs to be processed with a raised head, into a central hole of the die, and enabling the metal pipe to be coaxial with the central hole of the die; (3) the front end of the auxiliary tool body extends into the metal pipe, and the pressure head and the annular groove of the mold are located in the same plane; the auxiliary tool body is coaxial with the central hole of the mold; 4) fixing the roll forming assistive device, driving the die to clamp the outer circle of the hydraulic metal pipe to rotate by a lathe spindle, manually adjusting an adjusting screw rod to pressurize, and forming a convex head of a rolling drum; 5, the auxiliary tool body is dismantled and fixed, the auxiliary tool body is pulled out of the metal pipe, then the mold is dismantled from the three-jaw chuck, and the metal pipe is taken out. Operation is convenient, field operation can be conducted during field work, and the production efficiency is improved.

Description

Technical Field

[0001] The invention provides a hydraulic rolling method for a pipe joint boss. Background Art

[0002] In the production of hydraulic metal pipe parts, the process of making bulge heads is relatively complicated, the equipment is highly specialized, and the operating technology is relatively difficult.

[0003] For the production of hydraulic metal pipe mouth bulge convex heads in non-professional production workshops (such as Figure 1 When engineering equipment working in the field breaks down and needs to replace the hydraulic metal pipe, it is basically impossible to make the bulge head, which affects the efficiency of the engineering equipment. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a hydraulic rolling method for pipe joint bosses which is easy to operate and can be used to make bosses in the field.

[0005] The technical scheme adopted by the present invention is: a method for hydraulically rolling a pipe joint convex head, which is realized by using a hydraulic rolling auxiliary tool for a pipe joint convex head, the hydraulic rolling auxiliary tool for a pipe joint convex head comprises a mold and a rolling auxiliary tool, the mold comprises an upper mold and a lower mold; the upper mold and the lower mold are assembled into an annular structure, and an annular groove with an arc-shaped cross-section is provided on the inner wall of the annular structure; the rolling auxiliary tool comprises an auxiliary body, an adjusting screw and a pressure head; the auxiliary body is rod-shaped, and a plurality of pressure head holes are provided at the front end of the auxiliary body, the axis of the pressure head hole is arranged along the radial direction of the auxiliary body, and the pressure head holes are located in the same plane; a pressure head is provided in each pressure head hole, and the outer end of the pressure head is a ball head; an oil hole connecting the pressure head hole and the rear end is provided at the center of the auxiliary body; the rear diameter of the oil hole is larger than the front diameter, and a thread is provided at the rear end of the oil hole, and the thread is screwed to the adjusting screw; the part between the adjusting screw and the pressure head in the oil hole is filled with hydraulic oil; The steps include: 1) Fix the mold on the three-jaw chuck of the lathe, 2) Insert the end of the metal tube that needs to be processed with a bulge into the center hole of the mold, and make the metal tube coaxial with the center hole of the mold; adjust the distance between the end face of the metal tube and the annular groove of the mold to ensure the accurate position of the bulge; 3) Insert the front end of the auxiliary body into the metal tube, and make the pressure head and the annular groove of the mold in the same plane; and make the auxiliary body coaxial with the center hole of the mold; 4) Fix the rolling auxiliary tool, the lathe spindle drives the mold to clamp the outer circle of the hydraulic metal tube to rotate, manually adjust the screw pressure, and the rolling drum convex head is formed; 5) Remove and fix the auxiliary body, manually adjust the adjusting screw to release the pressure, and pull the auxiliary body out of the metal tube; then remove the mold from the three-jaw chuck; open the mold and take out the metal tube.

[0006] Furthermore, in step 3), before the front end of the auxiliary body is inserted into the metal pipe, grease is added to the ball head of the pressure head.

[0007] Furthermore, the upper die and the lower die are semi-annular structures, two locating pins are arranged on the joint surface of the upper die, and two locating pin holes are arranged on the joint surface of the lower die; the two locating pins are respectively inserted into the two locating pin holes.

[0008] Furthermore, two pressure head holes are provided at the front end of the auxiliary body, and the two pressure head holes are coaxial.

[0009] Furthermore, the radius of the ball head of the pressure head is equal to the inner radius of the arc section of the bulge to be processed; the radius of the arc section of the annular groove of the mold is equal to the outer radius of the arc section of the bulge to be processed.

[0010] Furthermore, the pressure head is made of hard alloy.

[0011] Compared with the prior art, the present invention has the following beneficial effects: When the present invention is used, it only needs to place one end of the round tube in the mold, insert the front end of the auxiliary body from the round tube into the annular groove of the mold, and then screw in the adjusting screw to extend the pressure head and rotate the mold to realize the molding of the bulge head. The operation is convenient and can be performed on-site during field work, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural diagram of the drum convex head used for production of the present invention.

[0013] Figure 2 It is a structural diagram of the pipe joint boss hydraulic rolling auxiliary tool used in the present invention.

[0014] Figure 3 It is a structural diagram of the mold of the pipe joint boss hydraulic rolling auxiliary tool used in the present invention.

[0015] Figure 4 It is a structural diagram of the hydraulic rolling auxiliary tool for the pipe joint boss adopted by the present invention when the mold is opened.

[0016] Figure 5 It is a structural diagram of the rolling tool of the pipe joint boss hydraulic rolling tool adopted by the present invention. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] like Figure 2-5 As shown, the hydraulic rolling aid for the pipe joint convex head adopted by the present invention includes a mold 1 and a rolling aid 2, wherein the mold 1 includes an upper mold 11 and a lower mold 12; the upper mold 11 and the lower mold 12 are assembled into an annular structure, and an annular groove 13 with an arc-shaped cross section is provided on the inner wall of the annular structure. The upper mold 11 and the lower mold 12 are semi-annular structures, and two locating pins 14 are provided on the assembled surface of the upper mold 11, and two locating pin holes 15 are provided on the assembled surface of the lower mold 12; the two locating pins 14 are respectively inserted into the two locating pin holes 15, so as to realize the assembly of the upper mold and the lower mold. The radius of the cross-sectional arc of the annular groove 13 of the mold 1 is equal to the outer radius Φ of the arc-shaped cross section of the processed drum convex head.

[0019] The rolling aid 2 includes an auxiliary body 21, an adjusting screw 22 and a pressure head 23; the auxiliary body 21 is rod-shaped, and two pressure head holes 24 are arranged at the front end of the auxiliary body 21 (the number of pressure head holes 24 is not limited to two, it can be one or more than two), the two pressure head holes 24 are coaxially arranged, and the axis of the pressure head hole 24 is arranged along the radial direction of the auxiliary body 21 (when there are multiple pressure head holes 24, the pressure head holes 24 are located in the same plane). A pressure head 23 is arranged in each pressure head hole 24, and the outer end of the pressure head 23 is a ball head; the radius of the ball head of the pressure head 23 is equal to the inner radius of the arc section of the convex head to be processed. The pressure head 23 is made of cemented carbide and has good wear resistance. An oil hole 25 connecting the pressure head hole and the rear end is arranged at the center of the auxiliary body; the rear diameter of the oil hole 25 is larger than the front diameter, and a thread is arranged at the rear end of the oil hole 25, and the thread is screwed with the adjusting screw 22. The portion between the adjusting screw 22 and the pressure head 23 in the oil hole 25 is filled with hydraulic oil.

[0020] The present invention comprises the following steps: 1) Fix the mold 1 on the three-jaw chuck of the lathe. 2) Insert the end of the metal tube 3 that needs to be processed with the bulge into the center hole of the mold, and make the metal tube 3 coaxial with the center hole of the mold 1; adjust the distance between the end surface of the metal tube 3 and the annular groove 13 of the mold to ensure the accurate position of the bulge; 3) Insert the front end of the auxiliary body 21 into the metal tube 3, and make the pressure head 23 and the annular groove of the mold in the same plane; and make the auxiliary body 21 coaxial with the center hole of the mold; 4) Fix the rolling auxiliary tool 2, and the lathe spindle drives the mold 1 to clamp the outer circle of the hydraulic metal tube 3 to rotate, and manually adjust the adjusting screw 22 to increase the pressure, and the rolling drum convex head is formed; 5) Remove and fix the auxiliary body 21, manually adjust the adjusting screw 22 to release the pressure, and pull the auxiliary body 21 out of the metal tube 3; then remove the mold 1 from the three-jaw chuck; open the mold 1, and take out the metal tube 3.

Claims

1. A method for hydraulically rolling a pipe joint convex head, which is implemented by a hydraulic rolling auxiliary tool for a pipe joint convex head, the hydraulic rolling auxiliary tool for a pipe joint convex head comprises a mold and a rolling auxiliary tool, the mold comprises an upper mold and a lower mold; the upper mold and the lower mold are assembled into an annular structure, and an annular groove with an arc-shaped cross-section is provided on the inner wall of the annular structure; the rolling auxiliary tool comprises an auxiliary body, an adjusting screw and a pressure head; the auxiliary body is rod-shaped, and a plurality of pressure head holes are provided at the front end of the auxiliary body, and the axis of the pressure head hole is arranged along the radial direction of the auxiliary body, and the pressure head holes are located in the same plane; a pressure head is provided in each pressure head hole, and the outer end of the pressure head is a ball head; an oil hole connecting the pressure head hole and the rear end is provided at the center of the auxiliary body; the rear diameter of the oil hole is larger than the front diameter, and a thread is provided at the rear end of the oil hole, and the thread is screwed with the adjusting screw; the part between the adjusting screw and the pressure head in the oil hole is filled with hydraulic oil; The steps include: 1) Fix the mold on the three-jaw chuck of the lathe, 2) Insert the end of the metal tube that needs to be processed with a bulge into the center hole of the mold, and make the metal tube coaxial with the center hole of the mold; adjust the distance between the end face of the metal tube and the annular groove of the mold to ensure the accurate position of the bulge; 3) Insert the front end of the auxiliary body into the metal tube, and make the pressure head and the annular groove of the mold in the same plane; and make the auxiliary body coaxial with the center hole of the mold; 4) Fix the rolling auxiliary tool, the lathe spindle drives the mold to clamp the outer circle of the hydraulic metal tube to rotate, manually adjust the screw pressure, and the rolling drum convex head is formed; 5) Remove and fix the auxiliary body, manually adjust the adjusting screw to release the pressure, and pull the auxiliary body out of the metal tube; then remove the mold from the three-jaw chuck; open the mold and take out the metal tube.

2. The method for hydraulically rolling a pipe joint boss according to claim 1, wherein in step 3), before the front end of the auxiliary body is inserted into the metal pipe, grease is added to the ball head of the pressure head.

3. The method for hydraulically rolling a pipe joint boss according to claim 1, characterized in that: The upper die and the lower die are semi-annular structures. Two locating pins are arranged on the joint surface of the upper die, and two locating pin holes are arranged on the joint surface of the lower die; the two locating pins are respectively inserted into the two locating pin holes.

4. The method for hydraulically rolling a pipe joint boss according to claim 1, characterized in that: The front end of the auxiliary body is provided with two pressure head holes, and the two pressure head holes are coaxial.

5. The method for hydraulically rolling a pipe joint boss according to claim 1, characterized in that: The radius of the ball head of the pressure head is equal to the inner radius of the arc section of the bulging head to be processed; the radius of the arc section of the annular groove of the mold is equal to the outer radius of the arc section of the bulging head to be processed.

6. The method for hydraulically rolling a pipe joint boss according to claim 1, characterized in that: The pressure head is made of hard alloy.

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