Pipe bending device without mandrel

Abstract

The utility model provides a mandrel-free pipe bending device which comprises a feeding shaft, a guide die, a wheel die and a clamping die, the guide die and the clamping die are sequentially arranged in an adjacent mode, the wheel die is arranged right ahead of the clamping die, and the feeding shaft is arranged right ahead of the end face of the end, away from the clamping die, of the guide die. A plurality of guide die semicircular grooves and a plurality of clamping die semicircular grooves which extend in the length direction of the guide die and the clamping die are formed in the side faces of the sides, close to the wheel die, of the guide die and the clamping die in an up-down spaced mode respectively, and each guide die semicircular groove and one clamping die semicircular groove are coaxially arranged. A plurality of wheel die semicircular grooves opposite to the clamping die semicircular grooves are formed in the wheel die at intervals up and down; the diameters of the guide mold semicircular groove, the clamping mold semicircular groove and the wheel mold semicircular groove are the same; the lower end of the wheel die is fixed to the machine table transmission main shaft, and the wheel die is driven by the machine table transmission main shaft to rotate clockwise from outside to the die clamping direction. The pipe bending device without the mandrel has no limitation of length and angle, and is suitable for pipelines made of various materials, including seamed, seamless and non-ferrous metal pipes.

Description

Technical Field

[0001] This utility model belongs to the field of pipe manufacturing technology, specifically relating to a mandrel-less pipe bending device. Background Technology

[0002] The working principle of pipe bending dies is based on cold bending technology, applying external force to the pipe through the die to bend it. Traditional mandrel bending requires a mandrel inside the pipe for support and an anti-wrinkle die to prevent the outer wall of the bend from collapsing and wrinkling. However, when bending short, thin-walled pipes with excessively small inner bend angles or straight clamping sections, traditional mandrel bending devices cannot guarantee the quality of the bend and reduce quality problems caused by mandrel issues. Utility Model Content

[0003] To address the aforementioned problems, this utility model provides a mandrel-less pipe bending device that has no length or angle limitations and is suitable for pipes of various materials, including welded, seamless, and non-ferrous metal pipes.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A mandrel-less pipe bending device includes a feeding shaft, a guide mold, a wheel mold, and a clamping mold. The guide mold and the clamping mold are arranged adjacent to each other in sequence. The wheel mold is located directly in front of the clamping mold. The feeding shaft is located directly in front of the end face of the guide mold away from the clamping mold. On the sides of the guide mold and the clamping mold near the wheel mold, a plurality of guide mold semicircular grooves and clamping mold semicircular grooves extending along their length directions are respectively arranged vertically at intervals. Each guide mold semicircular groove is coaxially arranged with a clamping mold semicircular groove. On the wheel mold, a plurality of wheel mold semicircular grooves are arranged vertically at intervals opposite to the clamping mold semicircular grooves. The diameters of the guide mold semicircular grooves, clamping mold semicircular grooves, and wheel mold semicircular grooves are the same. The lower end of the wheel mold is fixed to the main shaft of the machine tool drive. Driven by the main shaft of the machine tool drive, the wheel mold rotates clockwise from the outside towards the clamping mold.

[0006] Furthermore, the number of the guide mold semicircular groove, the clamping mold semicircular groove, and the wheel mold semicircular groove are all two.

[0007] Furthermore, a U-shaped groove with an opening facing the wheel mold is provided between the two semi-circular guide mold grooves. The outer end face of the upper side wall of the U-shaped groove is staggered with the outer end face of the lower side wall. The outer end face of the upper side wall of the U-shaped groove is located on the side of the lower side wall away from the wheel mold. The outer side face of the upper semi-circular guide mold groove is in the same vertical plane as the outer end face of the upper side wall of the U-shaped groove. The outer side face of the lower semi-circular guide mold groove is in the same vertical plane as the outer end face of the lower side wall of the U-shaped groove.

[0008] Furthermore, the clamping mold has a horizontal stepped surface at the center of its side near the wheel mold, and the two semi-circular grooves of the clamping mold are respectively provided on the two vertical sidewalls located on the upper and lower sides of the horizontal stepped surface.

[0009] Furthermore, the wheel mold includes a base, a top plate, and a central semi-circular plate. The base, top plate, and central semi-circular plate have the same diameter. Two semi-circular grooves are located between the base and the central semi-circular plate, and between the top plate and the central semi-circular plate, respectively, and are staggered vertically. The arcuate surfaces of the openings of the two semi-circular grooves are both located on the side of the circumferential sidewall of the central semi-circular plate near the central axis. Each semi-circular groove includes an arcuate section in the middle and straight sections at both ends. The straight section near one end of the clamping mold is positioned opposite to the semi-circular groove of the clamping mold. The middle semi-circular disk extends from the end face near one end of the clamping mold to the connection between the straight section and the arc-shaped section. An upper clamping groove is provided on the lower end face of the top plate, and a lower clamping groove is provided on the upper end face of the bottom plate. A middle clamping groove is provided between the two straight sections and on the front side of the middle semi-circular disk. When bending the pipe, the pipe fitting is embedded in the U-shaped groove, and the horizontal step surface extends into the middle clamping groove.

[0010] Furthermore, the guide mold is fixed on the guide mold base, and the clamping mold is fixed on the upper end surface of the clamping mold base.

[0011] Compared with the prior art, the mandrel-less pipe bending device of this utility model has the following advantages:

[0012] (1) Reduces a lot of preparation work such as core preparation before bending pipes, thereby improving production efficiency;

[0013] (2) Avoiding the manufacture of mandrels reduces costs;

[0014] (3) No lubrication is required inside the pipe, saving the lubricant and oil spraying process;

[0015] (4) It ensured the quality of the pipe bend;

[0016] (5) There is no friction between the mandrel and the pipe wall, which reduces the torque during pipe bending and thus extends the service life of the pipe bending machine;

[0017] (6) Reduce consumables, increase bending speed, and save mold changing and debugging time. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the mandrel-less pipe bending device described in this utility model.

[0019] Figure 2 This is a schematic diagram of the working state of the mandrel-less pipe bending device described in this utility model. Figure 1 .

[0020] Figure 3 This is a schematic diagram of the working state of the mandrel-less pipe bending device described in this utility model. Figure 2 .

[0021] Figure 4 This is a schematic diagram of the structure of the guide mold described in this utility model.

[0022] Figure 5 This is a schematic diagram of the clamping mold described in this utility model.

[0023] Figure 6 This is a schematic diagram of the structure of the wheel mold described in this utility model. Figure 1 .

[0024] Among them, 1-guide mold, 2-wheel mold, 3-clamping mold, 4-pipe fitting, 5-feeding shaft, 6-guide mold base, 7-clamping mold base, 8-machine base drive shaft, 11-guide mold semi-circular groove, 12-U-shaped groove, 21-wheel mold semi-circular groove, 22-base plate, 23-top plate, 24-middle semi-circular plate, 25-clamping mold middle groove, 211-arc section, 212-straight section, 231-clamping mold upper groove, 221-clamping mold lower groove, 31-clamping mold semi-circular groove, 32-horizontal step surface. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0026] like Figures 1-6As shown, a mandrel-less pipe bending device includes a feeding shaft 5, a guide mold 1, a wheel mold 2, and a clamping mold 3. The guide mold 1 and the clamping mold 3 are arranged adjacent to each other in sequence. The wheel mold 2 is located directly in front of the clamping mold 3. The feeding shaft 5 is located directly in front of the end face of the guide mold 1 away from the clamping mold 3. On the side surfaces of the guide mold 1 and the clamping mold 3 near the wheel mold 2, a plurality of semi-circular grooves 11 extending along their length are respectively provided vertically at intervals. Each semi-circular groove 11 of the guide mold is respectively connected to a... A semi-circular groove 31 is coaxially arranged, and a plurality of semi-circular grooves 21 are arranged on the wheel mold 2 at intervals above and below, opposite to the semi-circular grooves 31. The diameters of the guide mold semi-circular groove 11, the clamping mold semi-circular groove 31, and the wheel mold semi-circular grooves 21 are the same. The lower end of the wheel mold 2 is fixed on the machine tool drive shaft 8, the guide mold 1 is fixed on the guide mold base 6, and the clamping mold 3 is fixed on the upper end surface of the clamping mold base 7. Driven by the machine tool drive shaft 8, the wheel mold 2 rotates clockwise from the outside towards the clamping mold 3.

[0027] Specifically, there are two of each of the semi-circular groove 11 for the guide mold, the semi-circular groove 31 for the clamping mold, and the semi-circular groove 21 for the wheel mold.

[0028] A U-shaped groove 12 with an opening facing the wheel mold 2 is provided between the two semi-circular grooves 11 of the guide mold. The outer end face of the upper side wall of the U-shaped groove 12 is staggered with the outer end face of the lower side wall. The outer end face of the upper side wall of the U-shaped groove 12 is located on the side of the lower side wall away from the wheel mold 2. The outer side face of the upper semi-circular groove of the guide mold 1 is in the same vertical plane as the outer end face of the upper side wall of the U-shaped groove 12. The outer side face of the lower semi-circular groove of the guide mold 1 is in the same vertical plane as the outer end face of the lower side wall of the U-shaped groove 12.

[0029] The clamping mold 3 has a horizontal stepped surface 32 in the middle of the side of the wheel mold 2, and the two semi-circular grooves 31 of the clamping mold are respectively provided on the two vertical side walls located on the upper and lower sides of the horizontal stepped surface 32.

[0030] The wheel mold 2 includes a base plate 22, a top plate 23, and a central semi-circular plate 24. The base plate 22, the top plate 23, and the central semi-circular plate 24 have the same diameter. Two wheel mold semi-circular grooves 21 are located between the base plate 22 and the central semi-circular plate 24, and between the top plate 23 and the central semi-circular plate 24, respectively, and are staggered vertically. The arc-shaped surfaces where the openings of the two wheel mold semi-circular grooves 21 are located on the side of the circumferential sidewall of the central semi-circular plate 24 near the central axis. Each wheel mold semi-circular groove 21 includes a central arc-shaped section 211 and straight sections 212 at both ends, close to the clamping mold. The straight section 212 at one end of the mold is opposite to the semi-circular groove 31 of the clamping mold. The middle semi-circular disk 24 extends from the end face of the clamping mold 3 to the connection between the straight section 212 and the arc section 211. The upper clamping groove 231 is provided on the lower end face of the top disk 23, and the lower clamping groove 221 is provided on the upper end face of the bottom disk 22. The middle clamping groove 25 is provided between the two straight sections 212 and on the front side of the middle semi-circular disk 24. When bending the pipe, the pipe 4 is embedded in the U-shaped groove 12, and the horizontal step surface 32 extends into the middle clamping groove 25.

[0031] The arc of the arc segment 211 is less than 180°.

[0032] The working method of this utility model device is as follows: loosen the feeding shaft 5, insert one end of the pipe 4 into the feeding shaft 5 and stick it to the wheel mold 2, then tighten the feeding shaft 5, then close the clamping mold 3 and the wheel mold 2. After the wheel mold 2 and the clamping mold 3 are closed, the guide mold 1 closes and sticks to the surface of the pipe 4, start the program to form it in one go, and take out the pipe to complete the entire pipe bending process.

[0033] The two guide mold semicircular grooves 11, the two clamping mold semicircular grooves 31, and the two wheel mold semicircular grooves 2 are all staggered vertically, which can realize two pipe bending operations at the same time, and the two pipes do not interfere with each other during bending.

[0034] Those skilled in the art should understand that the above description is merely a specific embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A mandrel-less pipe bending device, characterized in that, The system includes a feeding shaft, a guide mold, a wheel mold, and a clamping mold. The guide mold and the clamping mold are arranged adjacent to each other in sequence. The wheel mold is located directly in front of the clamping mold. The feeding shaft is located directly in front of the end face of the guide mold away from the clamping mold. On the sides of the guide mold and the clamping mold near the wheel mold, there are multiple semi-circular grooves for the guide mold and the clamping mold extending along their length directions, spaced vertically. Each semi-circular groove for the guide mold is coaxially arranged with one semi-circular groove for the clamping mold. On the wheel mold, there are multiple semi-circular grooves for the wheel mold that are spaced vertically opposite to the semi-circular grooves for the clamping mold. The semi-circular grooves for the guide mold, the semi-circular grooves for the clamping mold, and the semi-circular grooves for the wheel mold have the same diameter. The lower end of the wheel mold is fixed to the main shaft of the machine tool drive. Driven by the main shaft of the machine tool drive, the wheel mold rotates clockwise from the outside towards the clamping mold.

2. The mandrelless pipe bending device according to claim 1, characterized in that, The number of semi-circular grooves for the guide mold, clamping mold, and wheel mold is two each.

3. The mandrel-less pipe bending device according to claim 2, characterized in that, A U-shaped groove with an opening facing the wheel mold is provided between the two semi-circular guide mold grooves. The outer end face of the upper side wall of the U-shaped groove is staggered with the outer end face of the lower side wall. The outer end face of the upper side wall of the U-shaped groove is located on the side of the lower side wall away from the wheel mold. The outer side face of the upper semi-circular guide mold groove is in the same vertical plane as the outer end face of the upper side wall of the U-shaped groove. The outer side face of the lower semi-circular guide mold groove is in the same vertical plane as the outer end face of the lower side wall of the U-shaped groove.

4. The mandrel-less pipe bending device according to claim 3, characterized in that, The clamping mold has a horizontal stepped surface in the middle of the side near the wheel mold, and the two semi-circular grooves of the clamping mold are respectively provided on the two vertical side walls located on the upper and lower sides of the horizontal stepped surface.

5. The mandrelless pipe bending device according to claim 4, characterized in that, The wheel mold includes a base, a top plate, and a central semi-circular plate. The base, top plate, and central semi-circular plate have the same diameter. Two semi-circular grooves are located between the base and the central semi-circular plate, and between the top plate and the central semi-circular plate, respectively, and are staggered vertically. The arc-shaped surfaces of the openings of the two semi-circular grooves are both located on the side of the circumferential sidewall of the central semi-circular plate near the central axis. Each semi-circular groove includes an arc-shaped section in the middle and straight sections at both ends, close to the central axis. The straight section at one end of the clamping mold is positioned opposite to the semi-circular groove of the clamping mold. The middle semi-circular disk extends from the end face of the clamping mold to the connection point between the straight section and the arc-shaped section. An upper clamping groove is provided on the lower end face of the top plate, and a lower clamping groove is provided on the upper end face of the bottom plate. A middle clamping groove is provided between the two straight sections and on the front side of the middle semi-circular disk. When bending the pipe, the pipe fitting is embedded in the U-shaped groove, and the horizontal step surface extends into the middle clamping groove.

6. The mandrelless pipe bending device according to claim 5, characterized in that, The guide mold is fixed on the guide mold base, and the clamping mold is fixed on the upper end face of the clamping mold base.

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