Anti-pinch flat thin-walled tube cutting jig, sawing machine and method

Abstract

The invention provides an anti-pinch flat thin-walled tube cutting jig, a sawing machine and a method. The jig comprises a clamping seat, a semicircular sleeve and a laser transmitter, the clamping seats are symmetrically and fixedly arranged on a jaw of the bench clamp and are used for assembling the jig on the bench clamp; each semicircular sleeve is of a half-section structure, a semicircular arc-shaped containing cavity is formed in each semicircular sleeve, the arc diameter of each semicircular arc-shaped containing cavity is matched with the outer diameter of a thin-walled pipe to be cut, and when the two semicircular sleeves are folded, the thin-walled pipe is wrapped and clamped, and a cutting gap is reserved; the back of the semicircular sleeve is connected with the clamping seat, and the semicircular sleeve is fixed to the lower portion of the clamping seat in a cantilever mode. The laser transmitter is arranged at the top of the clamping base and used for transmitting cross-shaped laser rays to judge clamping of the thin-walled tube. The semicircular sleeve provides uniform and firm radial support for the thin-walled tube, and huge clamping force of the bench clamp is dispersed to the whole semicircular sleeve, so that plastic deformation and flattening caused by the fact that the clamping force directly acts on the thin-walled tube are avoided, and the technical problem of deformation and flattening during cutting of the thin-walled tube in the prior art is effectively solved.

Description

Technical Field

[0001] This invention relates to a cutting and clamping device in the field of thin-walled tube processing, and in particular to a cutting fixture, saw, and method for preventing the flattening of thin-walled tubes. Background Technology

[0002] Cutting thin-walled tubes is a common but challenging problem in the metalworking industry. These tubes have thin walls, poor rigidity, and very little self-support. When cutting thin-walled tubes on a saw, the saw uses a vise to clamp the tube. If the clamping force is insufficient, the tube will move or vibrate during the cutting process, resulting in poor cut quality, inability to guarantee dimensional accuracy, and even the safety hazard of saw blade breakage. If the clamping force is too large, the saw's vise will deform the tube, easily flattening it and causing the product to be scrapped.

[0003] However, in the process of implementing the inventive technical solution in the embodiments of this application, the inventors of this application discovered that the above-mentioned technology has at least the following technical problems: Copper-nickel alloy thin-walled tubes typically have a wall thickness of around 2mm, resulting in very low wall support. Currently, these thin-walled tubes are commonly cut using laser cutting. However, laser cutting is a thermal cutting process, which creates a heat-affected zone, altering the metallographic structure and mechanical properties of the material around the cut. This cannot meet the requirements of some products with strict requirements for the physicochemical properties of the cut. Because thermal cutting affects the physicochemical properties of the cut, only cold cutting can be used. Manual cold cutting with a handheld grinder is inefficient and lacks precision, resulting in low efficiency, high labor intensity, and difficulty in guaranteeing the quality and perpendicularity of the cut surface. Ultimately, considering all factors, only sawing is the appropriate method.

[0004] To solve the problem of copper-nickel alloy thin-walled tubes being flattened by sawing machine vises and to increase the tube's support force, this device was invented. This device effectively solves the flattening problem by adding an arc-shaped support shell to the tube externally. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies and address the problems of insufficient support force and easy flattening of thin-walled tubes after clamping deformation, this application provides an anti-flattening thin-walled tube cutting fixture, a saw, and a method. The fixture clamps the thin-walled tube with two semi-circular sleeves, forming an arc-shaped support shell on the outside of the tube. This provides sufficient support force to prevent the thin-walled tube from being flattened and assists in clamping and centering, thus solving the technical problem of deformation and flattening during thin-walled tube cutting.

[0006] The solution adopted by the embodiments of this application to solve the technical problem is: A cutting fixture for preventing flattening of thin-walled tubes includes a clamping base, a semi-circular sleeve, and a laser emitter; The clamping base is symmetrically fixed to the jaws of the vise and is used to assemble the fixture onto the vise. The semi-circular sleeve has a semi-section structure with a semi-circular arc-shaped cavity inside. The arc diameter matches the outer diameter of the thin-walled tube to be cut. When the two semi-circular sleeves are closed, they cover and clamp the thin-walled tube and leave a cutting gap. The back of the semi-circular sleeve is connected to the clamping base, and the semi-circular sleeve is fixed to the side of the clamping base in a cantilever manner. The laser emitter is set on the top of the clamping base and is used to emit a cross-shaped laser line to determine the clamping of the thin-walled tube.

[0007] To further address the technical problems to be solved in the embodiments of this application, the embodiments of this application provide a method for cutting thin-walled tubes to prevent clamping, which utilizes a cutting fixture for thin-walled tubes to prevent clamping, and includes the following steps: Step 1. First, select the appropriate semicircular sleeve according to the outer diameter of the thin-walled tube and install it on the clamping seat; then, place the left and right clamping seats on the jaws of the bench vise and tighten the connecting bolts initially; finally, place the thin-walled tube to be cut into the circular space formed by the left and right semicircular sleeves and make its bottom contact the worktable of the saw. Step 2. Turn on both laser emitters to project cross-shaped laser lines onto the thin-walled tube or the worktable of the saw. The operator observes that the two cross-shaped laser lines are aligned. If the axis of the thin-walled tube is perpendicular to the feed direction of the saw blade, the two cross-shaped laser lines should be completely parallel or coincident. If the cross-shaped laser lines are found to be intersecting or at an angle, it indicates that the fixture installation or the placement of the thin-walled tube is tilted. It is necessary to loosen the connecting bolts and fine-tune the angle of the fixture until the cross-shaped laser lines are parallel or coincident. Step 3. After centering, start the clamping program of the vise; the jaws of the vise push the semi-circular sleeves on both sides to move towards the center at the same time. The two semi-circular sleeves completely cover and hold the thin-walled tube, and the cutting operation is carried out.

[0008] Positive effects: The technical solutions provided in this application embodiment have at least the following technical effects or advantages: 1. Because the embodiments of this application adopt the technical means of providing a semi-circular sleeve on the inner side of the clamping seat, when the two semi-circular sleeves are closed, they cover the thin-walled tube. The semi-circular sleeves provide uniform and solid radial support for the thin-walled tube, distributing the huge clamping force of the bench vise to the entire semi-circular sleeve, thereby avoiding the plastic deformation and flattening caused by the clamping force acting directly on the thin-walled tube. This effectively solves the technical problem of deformation and flattening during the cutting of thin-walled tubes in the prior art, and thus achieves the technical effect of preventing the deformation of thin-walled tubes during cutting from causing flattening.

[0009] 2. Since the embodiments of this application adopt the technical means of setting a laser emitter on the top of the clamping seat, the operator can observe whether the cross-shaped laser lines emitted by the left and right laser emitters are parallel or coincident, judge whether the fixture and thin-walled tube are tilted, and make timely corrections. This effectively solves the technical problem of deformation and flattening during thin-walled tube cutting in the prior art, thereby achieving the technical effect of improving the cutting accuracy of thin-walled tubes.

[0010] 3. Because the embodiments of this application adopt the technical means of setting a horizontal part at the bottom of the semi-circular sleeve, when the semi-circular sleeve covers the thin-walled tube, the thin-walled tube supported by the semi-circular sleeve, the sawing table and the thin-walled tube bracket at the tail of the sawing machine are kept on the same horizontal plane. There is no need to readjust the level of the thin-walled tube after each clamping, which effectively solves the technical problem of deformation and flattening when cutting thin-walled tubes in the prior art, thereby achieving the technical effect of improving the cutting and clamping efficiency of thin-walled tubes.

[0011] In summary, this method is suitable for use as a method for cutting thin-walled tubes to prevent them from being clamped. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is the southeast isometric view of this embodiment; Figure 2 This is the isometric drawing of the southwest region in this embodiment; Figure 3 This is the northeast isometric view of this embodiment; Figure 4 This is the isometric view of the northwest region in this embodiment; Figure 5 This is the front view of this embodiment; Figure 6 This is a top view of this embodiment; Figure 7 This is the right view of this embodiment; Figure 8 This is the isometric drawing AA of this embodiment; Figure 9 This is a schematic diagram of the clamping base structure; Figure 10 This is a schematic diagram of a semi-circular sleeve structure.

[0014] In the figure, 100. Clamping seat, 110. Vertical plate, 120. Side plate, 130. Top plate, 140. Mounting plate, 150. Threaded hole, 160. Bolt hole, 170. Laser seat, 200. Semicircular sleeve, 210. Horizontal part, 220. Countersunk hole, 300. Laser emitter, 400. Thin-walled tube. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0016] This application provides an anti-flattening thin-walled tube cutting fixture, which solves the problem of clamping deformation leading to flattening in the prior art when cutting thin-walled tubes. By using an anti-flattening thin-walled tube cutting fixture in a sawing machine, an arc-shaped support shell is formed on the outer wall of the thin-walled tube 400 to withstand the clamping force and prevent the thin-walled tube 400 from being flattened.

[0017] According to the instruction manual Figure 1-10 As shown, a cutting fixture for preventing flattened thin-walled tubes includes a clamping seat 100, a semi-circular sleeve 200, and a laser emitter 300. The clamping base 100 is symmetrically fixed to the jaws of the bench vise and is used to assemble the fixture onto the bench vise. The semi-circular sleeve 200 has a semi-section structure with a semi-circular arc-shaped cavity inside. The arc diameter of the cavity matches the outer diameter of the thin-walled tube 400 to be cut. When the two semi-circular sleeves 200 are closed, they cover and clamp the thin-walled tube 400 and leave a cutting gap. The semi-circular sleeves 200 cover the outer wall of the thin-walled tube 400. The supporting force of the semi-circular sleeves 200 prevents the thin-walled tube 400 from deforming and flattening. The back of the semi-circular sleeve 200 is connected to the clamping seat 100. The semi-circular sleeve 200 is fixed to the side of the clamping seat 100 in a cantilever manner. The laser emitter 300 is located on top of the clamping base 100 and is used to emit a cross-shaped laser line. By observing whether the two laser lines are parallel or overlapped, it can be determined whether the clamping of the thin-walled tube 400 is centered and without tilt.

[0018] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages: Because the clamping seat 100 has a semi-circular sleeve 200 on its inner side, when the two semi-circular sleeves 200 are closed, they cover the thin-walled tube 400. Therefore, the semi-circular sleeves 200 provide uniform and solid radial support for the thin-walled tube 400, distributing the huge clamping force of the vise to the entire semi-circular sleeve 200. This avoids the problem of plastic deformation and flattening caused by the clamping force acting directly on the thin-walled tube. At the same time, it allows the operator to use sufficient clamping force to prevent the thin-walled tube 400 from moving, improving the cutting accuracy.

[0019] Since the clamping seat 100 is equipped with a laser emitter 300, the operator can observe whether the cross-shaped laser lines emitted by the left and right laser emitters 300 are parallel or coincident to determine whether the fixture and thin-walled tube 400 are tilted, and make timely corrections. This fundamentally avoids the scrap caused by misaligned clamping and ensures the perpendicularity of the cut end face.

[0020] To ensure the stability of the structure in this embodiment, the clamping base 100 is a frame structure, including a vertical plate 110, a side plate 120, a top plate 130, and a mounting plate 140. The vertical plate 110 is provided on the side of the clamping base 100, the top plate 130 is provided on the upper part of the vertical plate 110, and the side plate 120 is provided on the outer side of the top plate 130. Threaded holes 150 are distributed on the top plate 130 and the side plate 120. The clamping base 100 is fixed on the jaws of the vise by screwing in the threaded holes 150 with connecting bolts and adjusting the horizontal position. The mounting plate 140 is provided on the top of the top plate 130, and a laser mount 170 is provided on the mounting plate 140 for mounting the laser emitter 300. Bolt holes 160 are provided on the lower part of the vertical plate 110, and the semi-circular sleeve 200 is detachably connected by countersunk bolts and nuts.

[0021] In this embodiment, the laser holder 170 is a rectangular groove.

[0022] As a standard technical choice, bolt hole 160 is a stepped through hole used for screwing the clamping seat 100 and the semi-circular sleeve 200.

[0023] To further ensure the stability of the structure in this embodiment, a countersunk hole 220 is provided on the side of the semicircular sleeve 200. The countersunk hole 220 corresponds to the bolt hole 160 of the upright plate 110. The countersunk bolt and nut are screwed onto the upright plate 110 through the countersunk hole 220 and the bolt hole 160.

[0024] To optimize the structure of this embodiment, a horizontal part 210 is provided at the bottom of the semicircular sleeve 200. The horizontal part 210 is a horizontal surface formed by cutting, so that the bottom plane of the semicircular sleeve 200 is horizontal with the sawing table. At the same time, the horizontal part 210 can ensure that the overall position of the thin-walled tube 400 remains unchanged when the semicircular sleeve 200 covers the thin-walled tube 400. When the fixture is installed on the bench vise, the lowest point of the thin-walled tube 400 supported in the semicircular sleeve 200 is in direct contact with the surface of the sawing table, so that the thin-walled tube 400, the sawing table and the thin-walled tube bracket at the tail of the sawing machine are kept on the same horizontal plane, avoiding the formation of a height difference.

[0025] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages: Because the bottom of the semicircular sleeve 200 is provided with a horizontal part 210, when the semicircular sleeve 200 covers the thin-walled tube 400, the thin-walled tube 400 supported by the semicircular sleeve 200, the sawing table and the thin-walled tube bracket at the tail of the sawing machine are kept on the same horizontal plane. There is no need to readjust the level of the thin-walled tube 400 after each clamping, which improves the clamping efficiency and accuracy of thin-walled tube cutting.

[0026] Preferably, a saw includes: a bench vise and a jig for cutting thin-walled tubes to prevent clamping.

[0027] A method for cutting thin-walled tubes to prevent flattening, using a cutting fixture for thin-walled tubes to prevent flattening, includes the following steps: Step 1. First, select the appropriate semi-circular sleeve 200 according to the outer diameter of the thin-walled tube 400 and install it on the clamping seat 100; then, place the left and right clamping seats 100 on the jaws of the bench vise and tighten the connecting bolts initially; finally, place the thin-walled tube 400 to be cut into the circular space formed by the left and right semi-circular sleeves 200 and make its bottom contact the worktable of the saw. Step 2. Turn on both laser emitters 300 to project cross-shaped laser lines onto the thin-walled tube 400 or the worktable of the saw. The operator observes the alignment of the two cross-shaped laser lines. If the axis of the thin-walled tube 400 is perpendicular to the feed direction of the saw blade, the two cross-shaped laser lines should be completely parallel or coincident. If the cross-shaped laser lines are found to be intersecting or at an angle, it indicates that the fixture installation or the placement of the thin-walled tube 400 is tilted. It is necessary to loosen the connecting bolts and fine-tune the angle of the fixture until the cross-shaped laser lines are parallel or coincident, thereby achieving precise alignment. Step 3. After centering, start the clamping program of the vise; the jaws of the vise push the semicircular sleeves 200 on both sides to move towards the center at the same time, and the two semicircular sleeves 200 completely cover and hold the thin-walled tube 400; since the semicircular sleeves 200 provide full-circumference support, the huge clamping force is borne by the semicircular sleeves 200, and the force acting directly on the outer wall of the thin-walled tube 400 becomes uniform and bearable, thus effectively preventing the thin-walled tube 400 from being flattened; at this time, normal cutting operations can be carried out to obtain a high-quality and deformation-free cut end face.

[0028] Features of this embodiment: 1. Effective anti-flattening: The thin-walled tube 400 is externally covered by two semi-circular sleeves 200, providing uniform and solid radial support for the thin-walled tube 400. This disperses the huge clamping force of the vise onto the entire semi-circular sleeve 200, thereby avoiding plastic deformation and flattening caused by the clamping force acting directly on the thin-walled tube. This allows the operator to use sufficient clamping force to prevent the thin-walled tube 400 from moving.

[0029] 2. Automatic leveling: The unique leveling part at the bottom of the semi-circular sleeve 200 ensures that the thin-walled tube 400 is always on the same level as the saw table and tail bracket when the fixture is clamped. This eliminates the need to readjust the level of the thin-walled tube 400 after each clamping, thus improving the clamping efficiency and accuracy of the thin-walled tube 400.

[0030] 3. Visual alignment and calibration: When the laser emitter 300 emits its laser beam, it can intuitively and quickly display the clamping status of the thin-walled tube. The operator can immediately determine whether the fixture and tube are tilted by observing whether the left and right cross-shaped laser lines are parallel or coincident, and make timely corrections. This fundamentally avoids the scrap caused by misalignment and ensures the perpendicularity of the cut end face.

[0031] 4. High adaptability: The fixture is connected to the bench vise by standard bolts. Its modular structure allows for the replacement of the corresponding semi-circular sleeve 200 according to different thin-walled pipe diameters. It has good versatility and is easy to promote and use on existing equipment.

[0032] It is worth noting that all content not described in detail in this specification belongs to existing technology known to those skilled in the art, and the model parameters of the saw, vise, and laser emitter 300 are not specifically limited and can be determined using conventional equipment. Electrical control components not mentioned in this technical solution are not shown in the figures because they belong to existing technology, and will not be described further here. The description of this invention is given for illustrative and descriptive purposes only, and is not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

[0033] Finally, it should be noted that: The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A thin-walled pipe cutting jig for preventing pinching, characterized in that: it comprises a clamping seat (100), a semicircular sleeve (200) and a laser emitter (300); the clamping seat (100) is symmetrically fixed on the jaw of a bench clamp, and is used for assembling the jig on the bench clamp; the semicircular sleeve (200) is of a semicircular structure, and is internally provided with a semicircular arc-shaped accommodating cavity, the diameter of the semicircular arc-shaped accommodating cavity is matched with the outer diameter of a thin-walled pipe (400) to be cut, when the two semicircular sleeves (200) are closed, the thin-walled pipe (400) is clamped and tightly covered, and a cutting gap is reserved; the back of the semicircular sleeve (200) is connected with the clamping seat (100), and the semicircular sleeve (200) is fixed on the side of the clamping seat (100) in a cantilevered manner; and the laser emitter (300) is arranged on the top of the clamping seat (100), and is used for emitting a cross-shaped laser line to determine the clamping of the thin-walled pipe (400).

2. The thin-walled pipe cutting jig for preventing pinching according to claim 1, characterized in that: the clamping seat (100) comprises a vertical plate (110), a side plate (120), a top plate (130) and a mounting plate (140); the vertical plate (110) is arranged on the side of the clamping seat (100), the top plate (130) is arranged on the upper portion of the vertical plate (110), the side plate (120) is arranged on the outer side of the top plate (130), and screw holes (150) are distributed on the top plate (130) and the side plate (120); the clamping seat (100) is fixed on the jaw of the bench clamp by screwing connecting bolts into the screw holes (150), and the horizontal position is adjusted; the mounting plate (140) is arranged on the top of the top plate (130), and a laser seat (170) is arranged on the mounting plate (140) and used for mounting the laser emitter (300); and screw holes (160) are arranged on the lower portion of the vertical plate (110), and the semicircular sleeve (200) is detachably connected with the clamping seat (100) by means of the countersunk head bolts and nuts.

3. The thin-walled pipe cutting jig for preventing pinching according to claim 2, characterized in that: the screw holes (160) are stepped through holes, and are used for screwing the clamping seat (100) and the semicircular sleeve (200).

4. The thin-walled pipe cutting jig for preventing pinching according to claim 2, characterized in that: countersunk head holes (220) are arranged on the side of the semicircular sleeve (200), the countersunk head holes (220) correspond to the screw holes (160) of the vertical plate (110), and the semicircular sleeve (200) is screwed on the vertical plate (110) by means of the countersunk head holes (220) and the screw holes (160) and the countersunk head bolts and nuts.

5. The thin-walled pipe cutting jig for preventing pinching according to claim 1, characterized in that: a horizontal portion (210) is arranged on the bottom of the semicircular sleeve (200), the horizontal portion (210) is a horizontal plane formed by cutting processing, the bottom plane of the semicircular sleeve (200) is horizontal with the working table of a sawing machine, and the horizontal portion (210) can keep the overall position of the thin-walled pipe (400) unchanged when the semicircular sleeve (200) covers the thin-walled pipe (400).

6. A sawing machine, characterized in that: it comprises: a bench clamp and a thin-walled pipe cutting jig for preventing pinching arranged on the jaw of the bench clamp, the thin-walled pipe cutting jig for preventing pinching being any one of the thin-walled pipe cutting jigs for preventing pinching according to claims 1-5. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 7. A method for cutting thin-walled pipe without pinching, using the cutting jig according to any one of claims 1-5, characterized by comprising the following steps: Step 1. First, select the corresponding semicircular sleeve (200) according to the outer diameter of the thin-walled pipe (400) and install it on the clamping seat (100); Then, place the left and right clamping seats (100) on the jaws of the bench vice and tighten the connecting bolts; Finally, place the thin-walled pipe (400) to be cut into the circular space formed by the left and right semicircular sleeves (200) and make the bottom of the pipe contact the saw bench workbench; Step 2. Turn on the two laser emitters (300) to project cross-shaped laser lines onto the thin-walled pipe (400) or the saw bench workbench; the operator observes the alignment of the two cross-shaped laser lines; Step 3. After the alignment is completed, start the clamping program of the bench vice; the jaws of the bench vice push the left and right semicircular sleeves (200) to move towards the center, and the two semicircular sleeves (200) completely cover and hold the thin-walled pipe (400) for cutting operation.

8. The method for cutting thin-walled pipe without pinching according to claim 7, characterized in that: In step 2, if the axis of the thin-walled pipe (400) is perpendicular to the saw blade feeding direction, the two cross-shaped laser lines should be completely parallel or coincident; if the cross-shaped laser lines are found to intersect or have an angle, it indicates that the jig is installed or the thin-walled pipe (400) is placed at an angle, and the connecting bolts need to be loosened to adjust the angle of the jig until the cross-shaped laser lines are parallel or coincident. ​

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