An on-line cutting device and method for continuously extruded metal tubing

Abstract

The application discloses an on-line cutting device and method for continuously extruding and forming metal pipes, which comprises a follow-up system, a cutting system and a supporting structure. The cutting system can make the pipe cutting cutter produce transverse movement to cut the pipe. The follow-up system can make the movement speed of the cutting system consistent with the movement speed of the extruded pipe. The on-line cutting device and cutting method can adapt to the needs of the continuous extrusion and formation of the pipe, and can realize industrialization and large-scale production.

Description

Technical Field

[0001] This invention relates to the field of metal plastic forming technology, specifically to an online cutting device and method for continuously extruded metal tubes. Background Technology

[0002] A more advanced forming method for small-diameter thin-walled metal tubes (referred to as tubes) is the superimposed extrusion forming technology where a rear-mounted tube blank pushes a front-mounted tube blank. This forming method can form all the remaining material into tubes, thus achieving continuous production, convenient demolding, and high production efficiency and material utilization. The forming of these tubes is carried out on a vertical hydraulic press and requires an online automatic cutting device to meet production efficiency requirements. Currently, there is no cutting device or method that meets these requirements.

[0003] Existing technologies for extruding plastic pipes include online automatic cutting methods, such as patent CN202540371U. Its working principle is as follows: 1) After the plastic pipe on the production line reaches the predetermined length, a limit switch sends a signal, and the blade motor drives the circular saw blade to rotate at high speed. The clamping motor, through a reducer and chain drive, drives the clamping jaws to clamp the pipe. The cutting machine moves forward at the same speed as the pipe under the traction force, while the reset motor moves in the same direction as the pipe; 2) After a delay, the circular saw blade rotates under the drive of the motor, and the linear feed motor rotates forward to drive the circular saw blade to make a linear feed. After a certain period of feed, the feed stops; 3) The linear feed motor reverses to drive the circular saw blade to retract linearly. The retraction position is determined by a retraction limit switch. Pressing the retraction limit switch stops the retraction, and the cutting is completed. However, this device has a complex structure, occupies a large space, and cannot be used for online cutting of metal pipes. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an online cutting device and method for continuously extruded metal pipes. This cutting method can adapt to the needs of continuous extrusion forming of pipes, enabling industrialization and large-scale production.

[0005] To achieve the above objectives, the specific solution adopted by the present invention is as follows:

[0006] The present invention provides an online cutting device for continuously extruded metal tubes, including a cutting system and a follower system mounted on a support structure. The follower system keeps the movement speed of the cutting system consistent with the movement speed of the extruded tube, and the cutting system causes the cutter to move laterally to cut the tube.

[0007] Furthermore, the follow-up system includes a follow-up block, a follow-up electromagnet, a follow-up valve, and a synchronization cylinder. The follow-up electromagnet, the follow-up valve, and the synchronization cylinder are all installed inside the follow-up block. The follow-up system enables the downward speed of the online cutting mechanism to be consistent with the movement speed of the extruded pipe.

[0008] Furthermore, the follower electromagnet includes an iron core with a flap-shaped tubular structure having two truncated cones, and a housing with a conical hole structure that can be adapted to the upper and lower truncated cones of the iron core. When the follower electromagnet is energized, the iron core generates a downward motion and thereby generates a clamping motion, which can clamp the downward tube and move together with the tube.

[0009] The follow-up valve includes a valve body and a valve core. The valve core rests against the lower end of the iron core. By changing the position of the valve core in the valve body, the direction of the hydraulic oil output can be changed.

[0010] The synchronizing cylinder is a double piston rod cylinder containing two oil chambers, upper and lower. The upper and lower oil chambers are respectively connected to the output oil circuit of the follower valve. The piston rod located above the piston is fixedly installed on the support structure. The action of the synchronizing cylinder can drive the follower system to follow the movement of the extruded pipe.

[0011] Furthermore, the cutting system includes a cutting block, a cutting mechanism, a double-link mechanism, and a bending pin mechanism; the cutting block is provided with a guide groove, and the double-link mechanism enables the cutting mechanism to move to the left along the guide groove to cut the extruded pipe; the bending pin mechanism enables the double-link mechanism to reset when the cutting mechanism returns.

[0012] Furthermore, the cutting mechanism is a sawing mechanism or a punching mechanism.

[0013] Furthermore, the sawing mechanism includes a cutting table, a cutting machine, and a sawing blade. The cutting table can move laterally along the guide groove. Through a double linkage mechanism, the cutting table and the cutting machine mounted on the cutting table can be moved to the left, thereby driving the sawing blade mounted on the cutting machine to cut the extruded pipe.

[0014] Furthermore, the punching mechanism includes a cutting table, a cutting machine, and a punching cutter. The cutting table can move laterally along the guide groove and can be driven to move to the left by a double linkage mechanism, thereby driving the punching cutter mounted on the cutting table to cut the extruded pipe.

[0015] Furthermore, the bending pin mechanism includes a bending pin and a slider, the bending pin being fixed to the support structure, and the slider being able to move laterally along the guide groove;

[0016] The double-link mechanism includes a double link and a top block. The left and right ends of the double link are connected to the cutting mechanism and the slider respectively by cylindrical pins. The top block is fixed on the support structure and is used to generate an upward force on the connecting shaft of the double link.

[0017] Another aspect of the present invention provides an online cutting method for continuously extruded tubing, mainly comprising the following steps:

[0018] Step 1: When the electromagnet is attracted, the iron core can hold the extruded pipe and move down synchronously with it. Under the action of the iron core, the valve core of the follow-up valve moves downward relative to the valve body, so that the hydraulic oil provided by the hydraulic control system enters the lower chamber of the synchronous cylinder, causing the synchronous cylinder to perform a synchronous downward action, thereby realizing the following of the pipe movement.

[0019] Step 2: The cutting mechanism moves downward synchronously with the follow-up system. Under the action of the bent pin, the slider moves to the left and the double connecting rod bends downward.

[0020] Step 3: Under the action of the top block, the downward-bending double connecting rod straightens, causing the cutting mechanism to move horizontally and cut the pipe.

[0021] Step 4: After the cutting is completed, the top block continues to act to make the double connecting rod bend upwards in the opposite direction, and the cutting mechanism separates from the pipe.

[0022] Step 5: When the electromagnet is de-energized, the iron core and valve core move upward, the follower valve reverses, the synchronous cylinder produces a reverse action, the follower system drives the cutting system to return, the slider moves to the right along the bent pin, and the double connecting rod straightens.

[0023] Step 6: After the iron core touches the support structure, it returns to the neutral position. The follower valve also returns to the neutral position, and both the follower system and the cutting system stop moving.

[0024] Beneficial effects:

[0025] 1) The cutting device in this invention uses an electromagnet to hold the pipe and tracks the movement of the pipe through a follow-up valve and a synchronous cylinder to achieve synchronous movement of the pipe cutting system and the pipe, resulting in high quality of the cut end face.

[0026] 2) In the cutting system of the present invention, the bending pin mechanism and the double linkage mechanism work together to achieve the feed and retraction of the tool through the downward and return movements during the synchronous downward movement, which is reliable.

[0027] 3) The online cutting device in this invention integrates a follow-up system and a cutting system, has a compact structure, and is suitable for continuous extrusion forming of metal pipes on hydraulic presses with limited installation space. It is especially suitable for continuous extrusion forming of small-diameter metal pipes on vertical hydraulic presses. Attached Figure Description

[0028] Figure 1 This is one of the structural principle diagrams of the online cutting device in this invention.

[0029] Figure 2This is the second structural schematic diagram of the online cutting device in this invention.

[0030] Figure 3 This is the third structural schematic diagram of the online cutting device in this invention.

[0031] Figure 4 This is the fourth structural schematic diagram of the online cutting device in this invention.

[0032] Figure 5 This is the fifth structural schematic diagram of the online cutting device in this invention.

[0033] Figure 6 This is the sixth schematic diagram of the online cutting device in this invention.

[0034] Figure 7 yes Figure 6 Enlarged view of point I in the middle.

[0035] Figure label:

[0036] 11. Pad, 12. Vertical plate, 13. Base plate;

[0037] 21. Piston, 22. Cylinder, 23. Housing, 24. Spring ring, 25. Iron core, 26. Valve core, 27. Valve body, 28. Valve spring, 29. Follower block;

[0038] 31. Cutting table; 32. Double connecting rod; 33. Slider; 34. Top block; 35. Bending pin; 36. Cutting block; 37. Limiting spring; 38. Sawing tool; 39. Cutting machine. Detailed Implementation

[0039] The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0040] It should be noted that, unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. In the specification and claims of this patent application, the terms "thin-walled tube," "tube," "extruded tube," and "tube" have the same meaning, referring to seamless tubes with small diameters produced by extrusion molding; the words "the" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" indicate that the elements or objects preceding "comprising" encompass the elements or objects listed following "comprising" or "including" and their equivalents, but do not exclude other elements or objects having the same function. The directions of movement of the elements described in the specification are only described according to the directions shown in the accompanying drawings and are not intended to limit the actual directions of movement of the elements.

[0041] The technical solution of the present invention will be described in detail below with reference to specific embodiments.

[0042] Example 1

[0043] This embodiment describes in detail an online cutting device for continuous extrusion forming of tubing, such as... Figure 1 As shown, the online cutting device includes a follow-up system, a cutting system, and a support structure. The follow-up system enables the cutting system to move at the same speed as the extruded pipe, avoiding interference between the cutting system and the pipe during cutting. The cutting system is located below the follow-up system and enables the pipe cutting tool to move laterally to cut the pipe.

[0044] The support structure includes a pad 11, a vertical plate 12, and a base plate 13; the pad 11 and the base plate 13 are fixedly connected by the vertical plate 12, and the space formed by the three is used to install the follow-up system and the cutting system; the pad 11 is located at the lower part of the pipe extrusion die, and the base plate 13 is fixed to the worktable of the hydraulic press.

[0045] The follow-up system includes a follower block 29, a follower electromagnet, a follower valve, and a synchronization cylinder. The follower electromagnet, follower valve, and synchronization cylinder are respectively mounted in the follower block 29 through the housing 23, valve body 27, and cylinder body 22, forming an integrated structure. The follower block 29 can move up and down within the space provided by the two vertical plates 12. The specific structures of the follower electromagnet, follower valve, and synchronization cylinder are described in detail below.

[0046] The follower electromagnet is a specially structured electromagnet, comprising a housing 23 and an iron core 25. A coil is housed within the housing 23. A through-hole is located in the middle of the housing 23, with both upper and lower sections of the through-hole being tapered structures, wider at the top and narrower at the bottom. The iron core 25 is a two-lobed tubular structure split axially. The upper and lower ends of the outer circumference of the iron core 25 each have a frustum-shaped structure matching the through-hole. An annular groove is located within the inner hole of the iron core 25, and a spring coil 24 is installed within the groove to allow the two tubular lobes to separate laterally. When the follower electromagnet is not energized, the upper end of the iron core 25 rests against the pad 11 under the action of the spring coil 24, remaining in a neutral position. At this time, there is a certain gap between the inner hole of the iron core 25 and the tubular material, which does not affect the downward movement of the tubular material. When the follower electromagnet is energized, the iron core 25 moves downward, simultaneously moving inward through the action of the frustum-shaped structure to engage with the tubular material. The downward-moving tubular material provides the downward force for the iron core 25.

[0047] The follow-up valve includes a valve core 26 and a valve body 27, which together form a three-position four-way valve with an O-type function. The P and O ports of the follow-up valve are connected to the oil inlet and return ports of the hydraulic control system, respectively. The A and B ports are the oil output terminals of the follow-up valve, respectively connected to the upper and lower oil chambers of the synchronous cylinder. The upper end of the valve core 26 rests against the iron core 25 of the follow-up electromagnet, and a valve spring 28 is installed at the lower end. It should be noted that since this device is installed below the pipe extrusion die on the hydraulic press, the hydraulic control system connected to the follow-up valve can be either the hydraulic control system of the hydraulic press or a separately installed hydraulic control system. Preferably, the hydraulic control system of the hydraulic press is used, eliminating the need for a separate hydraulic control system.

[0048] The synchronizing cylinder is a double piston rod cylinder. The synchronizing cylinder includes a cylinder body 22 located in the follower block 29 and a piston 21 located inside the cylinder body 22. The upper and lower ends of the piston 21 are respectively connected to an upper piston rod and a lower piston rod. The upper end of the upper piston rod is provided with a flange and is fixedly installed on the pad plate 11 through the flange. The piston 21 divides the inner cavity of the cylinder body 22 into two independent oil chambers, and the upper and lower oil chambers are respectively connected to the A port and B port of the follower valve.

[0049] When the iron core 25 is in the neutral position, the valve core 26 is also in the neutral position, the follower valve is closed, all oil ports are fully sealed, and the synchronous cylinder is stationary. When the follower electromagnet is energized, the iron core 25 is attracted, moving downwards while gripping the pipe and moving downwards with the pipe to the lower position. At the same time, it drives the valve core 26 to move downwards. The oil inlet P port of the follower valve is connected to the B port, and the oil return port O port is connected to the A port. Under the action of hydraulic oil, oil enters the lower chamber of the synchronous cylinder and exits the upper chamber. The cylinder body 22 drives the follower block 29 to move downwards synchronously with the pipe, realizing the following movement of the pipe. Because the follower valve and the synchronous cylinder have the force amplification function, they can amplify the iron core 25. The small downward force of core 25 is amplified, thereby driving the entire follower system to move downward synchronously with the pipe. When the follower electromagnet is de-energized, core 25, under the lateral expansion force of spring coil 24 and the axial thrust of valve spring 28, disengages from the pipe and moves upward, reaching the upper position of the follower electromagnet. The valve core 26 of the follower valve moves upward together, and the P port of the follower valve is connected to the A port, and the O port is connected to the B port. Oil enters the upper chamber of the synchronous cylinder and exits the lower chamber. The cylinder body 22 and the follower block 29 move upward to return. When the follower system moves upward to the upper starting point, core 25 touches the pad plate 11 and returns to the middle position. The follower valve closes and the synchronous cylinder stops moving.

[0050] The cutting system includes a cutting block 36 located below the follower block 29, a cutting mechanism for cutting pipes, a double-link mechanism that provides power to the cutting mechanism, and a bending pin mechanism that can reset the double-link mechanism. The cutting block 36 is provided with a guide groove, and the double-link mechanism can make the cutting mechanism move to the left along the guide groove to cut the extruded pipe. The bending pin mechanism can reset the double-link mechanism when the cutting mechanism returns, avoiding collision and interference between the cutter and the pipe.

[0051] The bending pin mechanism includes a bending pin 35 and a slider 33. The bending pin 35 is fixed on the base plate 13, and the slider 33 can move laterally along the cutting block 36.

[0052] The double-link mechanism can control the cutting action of the cutting mechanism. The double-link mechanism includes a double link 32 and a top block 34. The left and right ends of the double link 32 are connected to the cutting mechanism and the slider 33 respectively through cylindrical pins. The top block 34 is fixed on the base plate 13 and is used to generate an upward force on the connecting shaft of the double link 32.

[0053] The stroke of the lateral motion generated by the bending pin mechanism and the double linkage mechanism is equal to the stroke of the pipe cutting action.

[0054] The cutting mechanism used in this embodiment is a sawing mechanism, which includes a cutting table 31, a cutting machine 39 fixed on the cutting table 31, and a sawing blade 38 mounted on the cutting machine 39. The slider 33 and the cutting table 31 are slidably connected to the follower block 29 through the guide groove on the cutting block 36, and can generate lateral movement respectively; the cutting table 31 is equipped with a limit spring 37, which can make the cutting table 31 move to the right, and the right side of the cutting table 31 has a limit pin, so that the cutting table 31 has a right starting point.

[0055] Specifically, the sawing tool 38 can be a disc saw blade or an abrasive wheel cutting disc.

[0056] The online disconnection method includes the following steps:

[0057] Step 1: When the hydraulic press descends to a certain position and the pipe is extruded to the required length, the electromagnet is energized, and the iron core 25 descends. Under the action of the through hole and the frustum structure, the two tubular structures of the iron core 25 close, holding the downward-moving pipe. The pipe then drives the pipe to continue descending, forcing the valve core 26 to descend. Relative to the valve body 27, it is in the lower position. The pressure oil from the hydraulic press enters the follower valve through port P, and then enters the synchronous cylinder through port B, causing the entire follower system to move downwards. Figure 2 ;

[0058] Step 2: The sawing mechanism moves downwards synchronously with the follower system. Under the action of the bent pin 35, the slider 33 moves to the left, and the double connecting rod 32 bends downwards. Figure 2 ;

[0059] Step 3: After being acted upon by the top block 34, the double connecting rod 32 gradually straightens, forcing the cutting table 31 to move to the left, driving the rotating cutting machine 39 and the sawing blade 38 to perform the pipe cutting action, as shown below. Figure 3 ;

[0060] Step 4: Cutting ends. The cutting mechanism continues to descend. The top block 34 bends the double connecting rod 32 upwards, shortening its horizontal dimension. This causes the cutting table 31 to move to the right, disengaging the sawing blade 38 from the pipe. Figure 4 ;

[0061] Step 5: When the electromagnet is de-energized, the iron core 25 and valve core 26 rise to their upper positions under the elastic force of the valve spring 28. Simultaneously, the iron core 25 disengages from the pipe, and the pressurized oil changes its oil path, entering the synchronous cylinder through port A, causing the follow-up system and cutting mechanism to move upwards. Figure 5 ;

[0062] Step Six: During the upward movement of the follower system, slider 33 moves to the right position along bent pin 35, and double connecting rod 32 is gradually straightened, as... Figure 6 and Figure 7 ;

[0063] Step 7: The follow-up system continues to move upwards until it abuts against the pad 11. After the iron core 25 abuts against the pad 11, it returns to the neutral position. The follow-up valve also returns to the neutral position. Both the follow-up system and the cutting system stop moving. Figure 1 The original state.

[0064] Example 2

[0065] The online cutting device and its working process in this embodiment are basically the same as in Embodiment 1. The difference is that the cutting mechanism uses a punching mechanism. The punching tool is fixed on the cutting table 31, and the thrust generated by the double connecting rod 32 is used to directly punch and cut the pipe. This punching mechanism does not require a cutting machine, has a simpler structure, and does not produce chips, but the quality of the cut is poor.

[0066] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the invention in any way. All equivalent transformations or modifications made in accordance with the essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. An on-line cutting apparatus for continuously extruded shaped metal tubes, characterized in that, It includes a cutting system and a follower system mounted on a support structure. The follower system keeps the movement speed of the cutting system consistent with the movement speed of the extruded pipe. The cutting system causes the cutter to move laterally to cut the pipe. The follow-up system includes a follow-up block, a follow-up electromagnet, a follow-up valve, and a synchronization cylinder. The follow-up electromagnet, the follow-up valve, and the synchronization cylinder are all installed inside the follow-up block. The follow-up system can keep the downward speed of the online cutting mechanism consistent with the movement speed of the extruded pipe. The follower electromagnet includes an iron core with a truncated tubular structure having two truncated cones and a housing with a conical hole structure that can be adapted to the truncated cones of the iron core. When the follower electromagnet is energized, the iron core moves downward and thereby generates a clamping motion, which can clamp the downward tube and move with the tube. The follow-up valve includes a valve body and a valve core. The valve core rests against the lower end of the iron core. By changing the position of the valve core in the valve body, the direction of the hydraulic oil output can be changed. The synchronizing cylinder is a double piston rod cylinder containing two oil chambers, upper and lower. The upper and lower oil chambers are respectively connected to the output oil circuit of the follower valve. The piston rod located above the piston is fixedly installed on the support structure. The action of the synchronizing cylinder can drive the follower system to follow the movement of the extruded pipe.

2. An on-line cutting device for continuously extruded metal pipe as defined in claim 1, characterized in that: The cutting system includes a cutting block, a cutting mechanism, a double-link mechanism, and a bending pin mechanism. The cutting block is provided with a guide groove, and the double-link mechanism enables the cutting mechanism to move to the left along the guide groove to cut the extruded pipe. The bending pin mechanism enables the double-link mechanism to reset when the cutting mechanism returns.

3. An on-line cutting apparatus for continuously extruded metal pipe as defined in claim 2, wherein The cutting mechanism is a sawing mechanism or a punching mechanism.

4. An on-line cutting apparatus for continuously extruded metal pipe as defined in claim 3, wherein The sawing mechanism includes a cutting table, a cutting machine, and a sawing blade. The cutting table can move laterally along the guide groove. Through a double linkage mechanism, the cutting table and the cutting machine mounted on the cutting table can be moved to the left, thereby driving the sawing blade mounted on the cutting machine to cut the extruded pipe.

5. An on-line cutting apparatus for continuously extruded metal pipe as defined in claim 3, wherein The punching mechanism includes a cutting table, a cutting machine, and a punching cutter. The cutting table can move laterally along the guide groove. Through a double linkage mechanism, the cutting table can be moved to the left, thereby driving the punching cutter mounted on the cutting table to cut the extruded pipe.

6. An on-line cutting apparatus for continuously extruded metal pipe as defined in claim 2, wherein The bending pin mechanism includes a bending pin and a slider. The bending pin is fixed on the support structure, and the slider can move laterally along the guide groove. The double-link mechanism includes a double link and a top block. The left and right ends of the double link are connected to the cutting mechanism and the slider respectively by cylindrical pins. The top block is fixed on the support structure and is used to generate an upward force on the connecting shaft of the double link.

7. A method of on-line cutting using the on-line cutting apparatus for continuously extruded metal pipe according to any one of claims 1 to 6, characterized by, The main steps include: Step 1: When the electromagnet is attracted, the iron core can hold the extruded pipe and move down synchronously with it. Under the action of the iron core, the valve core of the follow-up valve moves downward relative to the valve body, so that the hydraulic oil provided by the hydraulic control system enters the lower chamber of the synchronous cylinder, causing the synchronous cylinder to perform a synchronous downward action, thereby realizing the following of the pipe movement. Step 2: The cutting mechanism moves downward synchronously with the follow-up system. Under the action of the bent pin, the slider moves to the left and the double connecting rod bends downward. Step 3: Under the action of the top block, the downward-bending double connecting rod straightens, causing the cutting mechanism to move horizontally and cut the pipe. Step 4: After the cutting is completed, the top block continues to act to make the double connecting rod bend upwards in the opposite direction, and the cutting mechanism separates from the pipe. Step 5: When the electromagnet is de-energized, the iron core and valve core move upward, the follower valve reverses, the synchronous cylinder produces a reverse action, the follower system drives the cutting system to return, the slider moves to the right along the bent pin, and the double connecting rod straightens. Step 6: After the iron core touches the support structure, it returns to the neutral position. The follower valve also returns to the neutral position, and both the follower system and the cutting system stop moving.

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