CN109622687B - Pipe fitting forming method for motorcycle frame - Google Patents
Pipe fitting forming method for motorcycle frame Download PDFInfo
- Publication number
- CN109622687B CN109622687B CN201811640811.2A CN201811640811A CN109622687B CN 109622687 B CN109622687 B CN 109622687B CN 201811640811 A CN201811640811 A CN 201811640811A CN 109622687 B CN109622687 B CN 109622687B
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- Prior art keywords
- pipe fitting
- shaped groove
- strip
- pipe
- fan
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/86—Making other particular articles other parts for bicycles or motorcycles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/16—Auxiliary equipment, e.g. for heating or cooling of bends
- B21D7/162—Heating equipment
Abstract
The invention relates to the field of motorcycles, and particularly discloses a pipe fitting forming method for a motorcycle frame, which comprises a pipe fitting preparation step; the method comprises the steps of preparing bending equipment, wherein the bending equipment comprises a processing table, a power supply, a plurality of high-frequency heating coils, a plurality of fixing rings and a die with a bending surface, a strip-shaped groove for containing a pipe fitting and a fan-shaped groove for allowing the end part of the pipe fitting to rotate are arranged on the upper surface of the processing table, one side of the strip-shaped groove is communicated with one side of a straight edge of the fan-shaped groove, the fixing rings are coaxially arranged in the strip-shaped groove in a sliding mode, the high-frequency heating coils are fixedly arranged; the die is fixedly arranged in the fan-shaped groove, and the bending surface of the die is opposite to the fixed ring; a step of installing pipe fittings; heating the pipe fitting; a pipe bending step and a pipe cooling and disassembling step. This scheme can buckle the pipe fitting, reduces the resilience ability after the pipe fitting buckles simultaneously.
Description
Technical Field
The invention belongs to the field of motorcycles, and particularly relates to a pipe fitting forming method for a motorcycle frame.
Background
The frame of the motorcycle is the outline of the whole motorcycle, and can integrate an engine, a gearbox, a storage battery, a shock absorber, a seat and the like together. In addition, the frame is subjected to the weight of the rider, the influence of inertia during acceleration and deceleration, and deformation caused by oversteer. The frame can be divided into a plate frame and a tubular frame according to whether the frame is formed by pipe fittings or sheet metal parts. The tubular frame is formed by connecting a plurality of pipe fittings in a welding mode, a threaded connection mode and the like, the installation mode of each pipe fitting is simple, the processing technology of the pipe fittings is mature, and the tubular frame is a common frame type in the market.
When the pipe fitting in the tubular frame is processed, the operations of cutting, bending, painting and the like of the pipe fitting are involved. The part of bending wherein is the difficult point of pipe fitting processing, and the processing of conventional buckling generally adopts the pipe fitting device of buckling to buckle the pipe fitting under the normal atmospheric temperature is adjusted, though can conveniently take out the pipe of buckling, improve work efficiency, at the in-process of buckling of pipe fitting, pipe fitting self has stress, produces the resilience under the effect of stress after the pipe fitting takes off easily, causes the size of bending of pipe fitting to have the mistake easily like this.
Disclosure of Invention
The invention aims to provide a pipe fitting forming method for reducing the resilience deformation of a bent part of a pipe fitting after the pipe fitting is bent.
In order to achieve the above object, the basic scheme of the invention is as follows: the pipe fitting forming method for the motorcycle frame comprises the following processing steps:
step 1: preparing a plurality of pipe fittings to be bent;
step 2: preparing bending equipment, which comprises a processing table, a power supply, a plurality of high-frequency heating coils, a plurality of fixing rings and a die with a bending surface, wherein a strip-shaped groove for containing a pipe fitting and a fan-shaped groove for allowing the end part of the pipe fitting to rotate are arranged on the upper surface of the processing table, one side of the strip-shaped groove is communicated with one side of a straight edge of the fan-shaped groove, the fixing rings are coaxially arranged in the strip-shaped groove in a sliding manner, the high-frequency heating coils are fixedly arranged in the fixing rings, and the high-; the die is fixedly arranged in the fan-shaped groove, and the bending surface of the die is opposite to the fixed ring;
and step 3: inserting the pipe fitting in the step 1 into the strip-shaped groove, sequentially penetrating the pipe fitting through a plurality of fixing rings, and contacting the outer wall of the pipe fitting with the inner rings of the fixing rings;
and 4, step 4: turning on a power supply, heating the pipe fitting in the fixed ring by the high-frequency heating coil, and preserving heat for 10-20S when the temperature of the pipe fitting in the fixed ring is constant at 800-;
and 5: clamping one end of the pipe fitting close to the fan-shaped groove, bending the pipe fitting around the heating position of the pipe fitting, sliding one end of the pipe fitting close to the fan-shaped groove to one side of the mold, and attaching the fixing ring to the bending surface of the mold;
step 6: after all the fixing rings are matched with the bending surfaces of the die, the power supply is turned off, and the pipe fitting is cooled in air; and when the pipe fitting is cooled to the room temperature, taking out the pipe fitting in the fixed ring.
The principle and advantages of the basic scheme are as follows: 1. all the fixing rings are coaxially and slidably arranged in the strip-shaped groove, when the pipe fitting is placed in the strip-shaped groove in the step 3, the pipe fitting needs to penetrate through the fixing rings, and the fixing rings and the strip-shaped groove can fully limit the pipe fitting; because the high-frequency heating coil is arranged in the fixing ring in the step 2, the pipe fitting in the fixing ring can be subjected to high-frequency heating by starting the high-frequency heating coil of the power supply in the step 4, so that the pipe fitting can be conveniently bent in the step 5; meanwhile, the distance between the high-frequency heating coil and the peripheral surface of the pipe fitting is kept constant under the limitation of the fixing ring, so that the peripheral surface of the pipe fitting is uniformly heated.
2. In step 3, the pipe is heated to the temperature of 800-; the purpose is to fully and uniformly heat the to-be-bent part of the pipe fitting, so that the pipe fitting in the step 5 is more easily bent and deformed; and in the bending process, the pipe fitting can slide to the die in the fan-shaped groove from the strip-shaped groove without obstacles.
3. When reading the pipe fitting and carrying out the air cooling in step 6, the department of buckling of pipe fitting is also spacing by the curved surface and the solid fixed ring of mould, and the elastic deformation of curved surface and solid fixed ring ability effectual reduction pipe fitting cooling process.
In conclusion, the forming method uses the bending device, and the bending device comprises the fixing ring, the high-frequency heating coil and the die, so that the pipe fitting can be heated in the process of bending the pipe fitting, and the pipe fitting is easier to bend; the pipe fitting after buckling can be limited by the fixing ring and the die, and springback deformation is caused when the pipe fitting is cooled effectively.
Further, in the step 4, when the temperature of the pipe fitting positioned in the fixed ring is a constant temperature of 900 ℃, the heat is preserved for 15S.
When the heating temperature of the pipe reaches higher temperature, the heat preservation time can be properly reduced, and the pipe has high toughness while the pipe has the characteristic of easy bending.
Further, in the step 2, the pipe bending device further comprises a bending mechanism, the bending mechanism comprises a clamping block for clamping the end part of the pipe fitting and a walking unit for driving the clamping block to slide in the strip-shaped groove or the fan-shaped groove, and the clamping block is in sliding contact with the bottom surface of the strip-shaped groove or the bottom surface of the fan-shaped groove.
The clamping blocks slide in the strip-shaped grooves or the fan-shaped grooves, the end portions of the pipe fittings can be clamped tightly by the clamping blocks, the walking units can drive the clamping blocks to slide in the strip-shaped grooves or the fan-shaped grooves after the end portions of the pipe fittings are clamped tightly, torsion is applied to the positions, to be bent, of the pipe fittings, and the pipe fittings are bent smoothly.
Furthermore, an annular cavity is arranged in the clamping block, a convex block is arranged at the bottom of the annular cavity, and a clamping hole is arranged in the convex block and is opposite to the side wall of the annular cavity; a wedge block is arranged in the clamping hole in a sliding mode, a spring is arranged in the clamping hole, one end of the spring is fixedly connected with the wedge block, the other end of the spring is fixedly connected with the inner wall of the clamping block, and the wedge surface of the wedge block is opposite to the fixing ring.
When the end part of the pipe fitting is inserted into the clamping block, the end surface of the pipe fitting abuts against the wedge surface of the wedge block, the wedge block is extruded into the clamping block, the spring contracts, the elastic force of the spring acts on the wedge block, and the wedge block fully abuts against the inner wall of the pipe fitting to fix and limit the end part of the pipe fitting.
Furthermore, in the step 2, two ends of the high-frequency heating coil penetrate out of the fixing rings to be connected with the high-frequency heating coil in the adjacent fixing ring, the free end of the high-frequency heating coil close to one end of the strip-shaped groove is connected with the positive electrode of the power supply, and the free end of the high-frequency heating coil close to the other end of the strip-shaped groove is connected with the negative electrode of the power supply.
Meanwhile, the high-frequency heating coils in the two adjacent fixing rings are connected, so that all the fixing rings are connected into a whole, and when the clamping block drives the end part of the pipe fitting to rotate around the bent part, the pipe fitting can drive the fixing rings and the high-frequency heating coils to synchronously rotate; the outer wall contact of solid fixed ring and mould, the interval under high frequency heating coil is connected between solid fixed ring and the solid fixed ring keeps invariable relatively, lets the buckling of pipe fitting not influenced.
Drawings
FIG. 1 is a flow chart of the process for forming a tubular member for a motorcycle frame according to the present invention;
FIG. 2 is a front sectional view of a bending apparatus according to an embodiment of the present invention;
FIG. 3 is a top view of FIG. 2;
figure 4 is an enlarged view of the clamping block of figure 2.
Detailed Description
The following is further detailed by the specific embodiments:
reference numerals in the drawings of the specification include: the machining table 10, the strip groove 101, the mounting portion 111, the bent portion 121, the rotating portion 131, the sector groove 102, the slide groove 103, the ejection groove 104, the die 20, the curved surface 201, the clamp block 30, the guide frame 301, the guide rail 302, the roller 303, the annular cavity 304, the projection 305, the detent hole 306, the wedge 307, the spring 308, the high-frequency heating coil 401, the fixing ring 402, the compression spring 403, the tension spring 404, and the pipe 50.
The operation flow of the pipe fitting forming method for the motorcycle frame in the embodiment is basically as shown in the attached figure 1, and the specific steps are as follows:
step 1: a plurality of pipe members 50 to be bent are prepared.
Step 2: preparing a bending apparatus substantially as shown in figures 2, 3 and 4 comprising a processing station 10, a die 20, a bending mechanism and a heating mechanism; the upper surface of the processing table 10 is provided with a strip-shaped groove 101 for containing the pipe 50 and a fan-shaped groove 102 for allowing the end part of the pipe 50 to rotate, and the bottom surface of the strip-shaped groove 101 is an arc surface attached to the side surface of the pipe 50; as shown in fig. 2 and 3, the strip groove 101 includes a mounting portion 111, a bending portion 121, and a rotating portion 131, which are arranged in this order from left to right.
As shown in fig. 3, the die 20 is rectangular parallelepiped, the lower right side of the die 20 is a curved surface 201 of the bent pipe 50, the upper sides of the bent portion 121 and the rotating portion 131 are communicated with the lower straight edge of the fan-shaped groove 102, the bottom of the fan-shaped groove 102 is coplanar with the bottom of the strip-shaped groove 101, the die 20 is welded in the fan-shaped groove 102 of the machining table 10, and the lower side of the curved surface 201 of the die 20 is opposite to the bent portion 121.
As shown in fig. 2, the bending mechanism comprises a clamping block 30 and a traveling unit, the traveling unit comprises a guide frame 301 and a guide rail 302 for driving the clamping block 30 to move, the guide frame 301 is horizontally and fixedly installed above the processing table 10, and the guide rail 302 is welded with the lower surface of the guide frame 301; the bottom of the fan-shaped groove 102 is provided with an arc-shaped sliding groove 103, and the track of the sliding groove 103 is consistent with the moving track of the clamping block 30.
As shown in fig. 3, the heating mechanism includes a power supply, six high-frequency heating coils 401 and six fixing rings 402, the fixing rings 402 are coaxially slidably disposed in the bending portions 121, the high-frequency heating coils 401 are fixedly mounted in the fixing rings 402, and both ends of the high-frequency heating coils 401 penetrate out of the fixing rings 402 and are connected to the high-frequency heating coils 401 in the adjacent fixing rings 402, the free end of the leftmost high-frequency heating coil 401 is connected to the positive electrode of the power supply, and the free end of the rightmost high-frequency heating coil 401 is connected to the negative electrode of the; a pressure spring 403 is fixedly installed between every two adjacent fixing rings 402, and the pressure spring 403 is arranged on the upper sides of the fixing rings 402; a tension spring 404 is fixedly installed between two adjacent fixing rings 402, the tension spring 404 is arranged on the lower side of the fixing rings 402, and the tension spring 404 is opposite to the compression spring 403 and is located on the same horizontal plane.
As shown in fig. 4, the bottom of the clamping block 30 is rotatably provided with a roller 303, the axis of the roller 303 is parallel to the axis of the fixing ring 402, and the roller 303 at the bottom of the clamping block 30 is in sliding contact with the bottom surface of the sliding groove 103; as shown in fig. 3, an exit groove 104 for exiting the clamp block 30 is provided at the left end of the slide groove 103.
As shown in fig. 4, an annular cavity 304 is provided in the clamping block 30, a protrusion 305 integrally formed with the clamping block 30 is provided at the bottom of the annular cavity 304, two retaining holes 306 are provided on the side wall of the protrusion 305, and the retaining holes 306 are opposite to the side wall of the annular cavity 304; a wedge block 307 is arranged in the clamping hole 306 in a sliding manner, a spring 308 is arranged in the clamping hole 306, one end of the spring 308 is fixedly connected with the wedge block 307, the other end of the spring 308 is fixedly connected with the inner wall of the clamping block, and the wedge surface of the wedge block 307 is opposite to the fixing ring 402.
Further, the upper surface of the mold 20 is higher than the top of the fixing ring 402.
And step 3: horizontally inserting the pipe 50 in the step 1 into the strip-shaped groove 101 from left to right, wherein the bottom surface of the strip-shaped groove 101 is attached to the side surface of the pipe 50, the bent part of the pipe 50 is positioned at the fixing ring 402, and the outer wall of the pipe 50 is in contact with the inner wall of the fixing ring 402; the right end of the pipe 50 is horizontally inserted into the annular cavity 304 as shown in fig. 3, in the process of inserting the pipe 50, the end surface of the pipe 50 abuts against the wedge surface of the wedge 307, the wedge 307 is extruded into the clamping block, the spring 308 contracts, the elastic force of the spring 308 acts on the wedge 307, and the wedge 307 fully abuts against the inner wall of the pipe 50, so that the right end of the pipe 50 is fixed and limited.
And 4, step 4: the power supply is turned on, the current in the high-frequency heating coil 401 flows, and the high-frequency heating coil 401 is arranged in the fixing ring 402 in a coil mode, so that the high-frequency heating coil 401 can perform high-frequency heating on the pipe fitting 50 installed in the fixing ring 402, the bent position of the pipe fitting 50 can quickly reach 900 ℃, and when the temperature reaches 900 ℃, the heat of the pipe fitting 50 is preserved for 10-20 seconds.
And 5: starting the guide rail 302, the guide rail 302 drives the clamping block 30 to slide along the sliding groove 103, the roller 303 slides in the sliding groove 103, and at the moment, the clamping block 30 drives the right end of the pipe fitting 50 to synchronously rotate around the bent part of the pipe fitting 50 along the sliding groove 103; in the process of rotating the right end of the pipe 50, the bending part 121 of the pipe 50 is attached to the bending surface 201 of the die 20; the right ends of the fixing ring 402 and the pipe 50 slide in the fan-shaped groove 102, meanwhile, as shown in fig. 3, the pressure spring 403 on the upper side of the fixing ring 402 is compressed, the tension spring 404 on the lower side of the fixing ring 402 is stretched, the high-frequency heating coil 401 in the fixing ring 402 continuously heats the pipe 50, one side of the pipe 50 close to the pressure spring 403 is extruded, one side of the pipe 50 close to the tension spring 404 is stretched, bending of the pipe 50 is achieved, the inner wall of the fixing ring 402 abuts against the circumferential surface of the pipe 50 during bending, and the pipe 50 is formed uniformly.
Step 6: after all the fixing rings 402 are matched with the curved surfaces of the mold 20, the power supply is turned off, and the pipe fitting 50 is cooled in air; when the pipe 50 is cooled to room temperature, the guide rails 302 move the clamp blocks 30 upward of the withdrawing groove 104, so that the upper end of the pipe 50 is loosened, and then the pipe 50 located in the fixing ring 402 and the strip groove 101 is withdrawn.
Claims (4)
1. The pipe fitting forming method for the motorcycle frame is characterized by comprising the following processing steps of:
step 1: preparing a plurality of pipe fittings to be bent;
step 2: preparing bending equipment, which comprises a processing table, a power supply, a plurality of high-frequency heating coils, a plurality of fixing rings and a die with a bending surface, wherein a strip-shaped groove for containing a pipe fitting and a fan-shaped groove for allowing the end part of the pipe fitting to rotate are arranged on the upper surface of the processing table, one side of the strip-shaped groove is communicated with one side of a straight edge of the fan-shaped groove, the fixing rings are coaxially arranged in the strip-shaped groove in a sliding manner, the high-frequency heating coils are fixedly arranged in the fixing rings, and the high-; the die is fixedly arranged in the fan-shaped groove, and the bending surface of the die is opposite to the fixed ring; the bending mechanism comprises a clamping block for clamping the end part of the pipe fitting and a walking unit for driving the clamping block to slide in the strip-shaped groove or the fan-shaped groove, and the clamping block is in sliding contact with the bottom surface of the strip-shaped groove or the bottom surface of the fan-shaped groove; the bottom of the fan-shaped groove is provided with an arc-shaped sliding groove, and the track of the sliding groove is consistent with the moving track of the clamping block;
and step 3: inserting the pipe fitting in the step 1 into the strip-shaped groove, sequentially penetrating the pipe fitting through a plurality of fixing rings, and contacting the outer wall of the pipe fitting with the inner rings of the fixing rings;
and 4, step 4: turning on a power supply, heating the pipe fitting in the fixed ring by the high-frequency heating coil, and preserving heat for 10-20S when the temperature of the pipe fitting in the fixed ring is constant at 800-;
and 5: clamping one end of the pipe fitting close to the fan-shaped groove, bending the pipe fitting around the heating position of the pipe fitting, sliding one end of the pipe fitting close to the fan-shaped groove to one side of the mold, and attaching the fixing ring to the bending surface of the mold;
step 6: after all the fixing rings are matched with the bending surfaces of the die, the power supply is turned off, and the pipe fitting is cooled in air; and when the pipe fitting is cooled to the room temperature, taking out the pipe fitting in the fixed ring.
2. The method as claimed in claim 1, wherein in the step 4, the temperature of the pipe to be positioned in the fixing ring is maintained for 15S at a constant temperature of 900 ℃.
3. The method for forming the tube fitting for the frame of the motorcycle of claim 2, wherein the clamping block is internally provided with an annular cavity, the bottom of the annular cavity is provided with a lug, and a clamping hole is arranged in the lug and is opposite to the side wall of the annular cavity; the downthehole slidable mounting that is equipped with of screens has the voussoir, installs the spring in the screens hole, the one end and the voussoir fixed connection of spring, the other end and the inner wall fixed connection of screens piece of spring, the wedge surface and the solid fixed ring of voussoir are relative.
4. The tube forming method for a motorcycle frame as claimed in claim 3, wherein in the step 2, both ends of the high-frequency heating coil penetrate out of the fixing rings to be connected with the high-frequency heating coil in the adjacent fixing ring, the free end of the high-frequency heating coil near one end of the strip-shaped groove is connected with the positive electrode of the power supply, and the free end of the high-frequency heating coil near the other end of the strip-shaped groove is connected with the negative electrode of the power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811640811.2A CN109622687B (en) | 2018-12-29 | 2018-12-29 | Pipe fitting forming method for motorcycle frame |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811640811.2A CN109622687B (en) | 2018-12-29 | 2018-12-29 | Pipe fitting forming method for motorcycle frame |
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| Publication Number | Publication Date |
|---|---|
| CN109622687A CN109622687A (en) | 2019-04-16 |
| CN109622687B true CN109622687B (en) | 2020-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811640811.2A Active CN109622687B (en) | 2018-12-29 | 2018-12-29 | Pipe fitting forming method for motorcycle frame |
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| CN (1) | CN109622687B (en) |
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| CN102500664A (en) * | 2011-11-23 | 2012-06-20 | 大连百合氧枪喷头有限公司 | Arc curving machine for water jacket pipe of crystallizer of continuous casting machine in metallurgical industry |
| CN102847764A (en) * | 2011-06-28 | 2013-01-02 | 第一高周波工业株式会社 | Bending processing device for metal tube |
| CN102962361A (en) * | 2012-12-14 | 2013-03-13 | 西北有色金属研究院 | Detachable electromagnetic induction heater for diameter-expanded bend-pushed large-diameter elbow |
| CN203426220U (en) * | 2013-05-22 | 2014-02-12 | 洛阳理工学院 | Manual type pipe hot-bending device |
| CN104259272A (en) * | 2014-08-11 | 2015-01-07 | 西北工业大学 | Induction heating stretch-bending forming device for aircraft sectional materials |
| JP2016043375A (en) * | 2014-08-21 | 2016-04-04 | 第一高周波工業株式会社 | Method for manufacturing bent metal tube, bending device for metal tube and coil |
| RU169825U1 (en) * | 2016-06-30 | 2017-04-03 | Федеральное Государственное Унитарное Предприятие "Научно-Производственное Объединение "Техномаш" | BENDING MACHINE |
| CN108607910A (en) * | 2018-06-26 | 2018-10-02 | 郑州匹客科技有限公司 | A kind of anti-fold stainless steel elbow machine |
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2018
- 2018-12-29 CN CN201811640811.2A patent/CN109622687B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102847764A (en) * | 2011-06-28 | 2013-01-02 | 第一高周波工业株式会社 | Bending processing device for metal tube |
| CN102500664A (en) * | 2011-11-23 | 2012-06-20 | 大连百合氧枪喷头有限公司 | Arc curving machine for water jacket pipe of crystallizer of continuous casting machine in metallurgical industry |
| CN102962361A (en) * | 2012-12-14 | 2013-03-13 | 西北有色金属研究院 | Detachable electromagnetic induction heater for diameter-expanded bend-pushed large-diameter elbow |
| CN203426220U (en) * | 2013-05-22 | 2014-02-12 | 洛阳理工学院 | Manual type pipe hot-bending device |
| CN104259272A (en) * | 2014-08-11 | 2015-01-07 | 西北工业大学 | Induction heating stretch-bending forming device for aircraft sectional materials |
| JP2016043375A (en) * | 2014-08-21 | 2016-04-04 | 第一高周波工業株式会社 | Method for manufacturing bent metal tube, bending device for metal tube and coil |
| RU169825U1 (en) * | 2016-06-30 | 2017-04-03 | Федеральное Государственное Унитарное Предприятие "Научно-Производственное Объединение "Техномаш" | BENDING MACHINE |
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| CN109622687A (en) | 2019-04-16 |
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