A non-planar open hole cutting tool and method of use

Abstract

The present application relates to the technical field of hole cutting tools, and discloses a non-planar hole cutting tool and a use method, which comprise a center positioning needle, a cutting assembly, an angle adjusting mechanism, an adjustable support guide base and a magnetic positioning base; a first level gauge is arranged on the upper surface of the magnetic positioning base, and an electromagnet is arranged at the bottom of the magnetic positioning base; the upper surface of the magnetic positioning base is connected with the adjustable support guide base through a connecting rod; the angle adjusting mechanism comprises a fixed end and a rotating end, a second level gauge and a third level gauge are arranged on the fixed end, the fixed end is fixedly connected with one side of a sliding rod, the other side of the sliding rod is slidably connected with the adjustable support guide base, and the upper surface of the adjustable support guide base is parallel to the sliding rod; the rotating end of the angle adjusting mechanism is slidably connected with the center positioning needle, the center positioning needle is slidably connected with the cutting assembly, and the cutting assembly is provided with a cutting arm. The tool solves the problems of low cutting precision, complex operation and poor adaptability.

Description

Technical Field

[0001] This invention relates to the field of hole-cutting tools, and in particular to a non-planar hole-cutting tool and its method of use. Background Technology

[0002] In industrial settings such as transformer tank manufacturing and piping assembly, it is often necessary to perform drilling operations on non-planar structures (such as folded sections of the tank, sloping surfaces of the tank cover, and saddle-shaped openings at the intersection of connecting pipes and main connecting pipes). Traditional methods rely on operator experience, and using conventional tools such as steel rulers and compasses makes it difficult to achieve precise positioning of the drilling center and continuous symmetrical cutting of the intersection contour on curved or sloping surfaces. This not only results in large errors and low efficiency but also easily leads to defects in the quality of subsequent cutting and welding.

[0003] The existing patent with publication number CN217192734U fixes the center by spot welding the positioning pin to the surface of the workpiece, but spot welding will damage the surface of the workpiece and is not applicable to finished parts or situations where welding is not allowed; although the existing patent with publication number CN217192734U can fit the curved surface for scribing, it cannot cut. Summary of the Invention

[0004] To address existing problems, this invention provides a non-planar hole-cutting tool. It aims to achieve a secure base positioning through electromagnet attraction of a magnetic positioning base, and uses paired levels for orthogonal verification to ensure the parallel positioning of the sliding rod with the upper surface of the magnetic positioning base. Multiple clamps are used to fine-tune the rod connection to achieve standard directional limiting, thus solving the problems of low precision, complex operation, and poor adaptability in existing non-planar hole-cutting technologies.

[0005] To achieve the above objectives, the present invention provides the following technical solution.

[0006] This invention provides a non-planar hole-opening cutting tool, including a center positioning pin, a cutting assembly, an angle adjustment mechanism, an adjustable support guide base, and a magnetic positioning base. The magnetic positioning base has a first level on its upper surface and an electromagnet at its bottom, the electromagnet being used to attract and fix it to the surface of the workpiece to be drilled. The upper surface of the magnetic positioning base is connected to the adjustable support guide base via a connecting rod. The angle adjustment mechanism includes a fixed end and a rotating end. A second level is provided on the fixed end, which is fixedly connected to one side of a sliding rod. The other side of the sliding rod is slidably connected to the adjustable support guide base. A fourth level is provided on the adjustable support guide base, and the upper surface of the adjustable support guide base remains parallel to the sliding rod. The rotating end of the angle adjustment mechanism is slidably connected to the center positioning pin, and the center positioning pin is slidably connected to the cutting assembly, which is provided with a cutting arm.

[0007] As a further improvement of the present invention, the adjustable bracket guide base is provided with a first clip for limiting the sliding rod.

[0008] As a further improvement of the present invention, a second clip for limiting the center positioning pin is provided on the rotating end of the angle adjustment mechanism.

[0009] As a further improvement of the present invention, a reference line is provided on the fixed end, and an angle dial scale is provided on the rotating end.

[0010] As a further improvement of the present invention, the cutting assembly further includes a slider; the slider is slidably connected to the central positioning pin, and a control rotation motor is provided on the slider to drive the cutting arm to rotate relative to the central positioning pin; the cutting arm passes through the variable diameter groove of the slider.

[0011] As a further improvement of the present invention, the cutting arm includes a variable diameter ruler and a sliding arm that are perpendicular to each other, and a laser cutting distance measuring system is slidably connected to the sliding arm.

[0012] As a further improvement of the present invention, the variable diameter ruler is perpendicular to the center positioning needle.

[0013] As a further improvement of the present invention, the laser cutting ranging system is parallel to the center positioning needle.

[0014] As a further improvement of the present invention, the slider is provided with a locking knob for limiting the cutting arm.

[0015] The present invention also discloses a method of using a non-planar hole-cutting tool, including the following steps: S1: Place the magnetic positioning base on the non-planar surface of the workpiece to be drilled, and fix it to the workpiece surface by energizing the bottom electromagnet, observe the first level and the second level to adjust the adsorption position angle of the magnetic positioning base, or observe the third level and the fourth level to adjust the angle of the rotating sliding rod relative to the adjustable bracket guide base. S2: Connect the adjustable bracket guide base to the magnetic positioning base via the connecting rod, adjust the sliding position of the sliding rod on the adjustable bracket guide base and lock it; S3: Adjust the tilt angle of the center positioning pin by rotating the rotating end of the angle adjustment mechanism relative to the fixed end; S4: Slide the cutting assembly along the center positioning pin to bring the end of the cutting arm to the preset opening radius position and lock the relative position of the cutting assembly and the center positioning pin; S5: Start the cutting assembly. Using the tip of the center positioning pin as the rotation center, the cutting arm rotates around the center positioning pin to cut the workpiece, completing the hole opening operation on a non-planar surface.

[0016] The present invention has the following beneficial effects: The tool is magnetically attached to the surface of a ferromagnetic workpiece using a magnetic positioning base. An angle adjustment mechanism and an adjustable support guide base allow for adjustment of the angle and position of the central positioning pin. This, combined with the cutting assembly, enables precise hole cutting on non-planar surfaces (curved surfaces, bends, and slopes). A pair of levels are used for leveling in two orthogonal directions to verify that the upper surface of the magnetic positioning base is parallel to the sliding rod. This ensures that the laser cutting rangefinder system lies on the plane formed by the magnetic positioning base and the sliding rod, preventing skewed cutting. This cutting tool solves the problems of traditional tools being difficult to fix and inaccurately positioned on non-planar surfaces, improving cutting accuracy and efficiency.

[0017] Preferably, the first clamp can lock the sliding rod in any adjustable position of the adjustable bracket guide base, preventing the sliding rod from shifting during the cutting process and causing the center positioning to deviate, thus ensuring the stability of the cutting posture.

[0018] Preferably, the second clamp can lock the center positioning pin at any extension length position of the rotating end, ensuring that the center positioning pin does not slip axially during the cutting process and guaranteeing the positioning accuracy of the opening center.

[0019] Preferably, by combining the baseline with the angle scale, easy-to-operate angle cutting on non-planar surfaces can be achieved, and the tilt angle of the center positioning pin can be accurately read and locked, enabling sequential cutting of multiple holes in a row according to the same standard, thus improving the tool's adaptability to inclined and curved surfaces and the consistency of cutting angles.

[0020] Preferably, the slider can adjust the cutting radius of the virtual cutting circle by sliding along the central positioning pin, and the variable diameter groove allows the cutting arm to be finely adjusted in the radial direction of the virtual cutting circle. The two work together to achieve continuous adjustable cutting of different hole diameters, improving the versatility of the tool.

[0021] Preferably, the variable diameter gauge is used to read and lock the cutting radius, and the laser cutting ranging system contacts the workpiece surface vertically downward. The vertical arrangement of the two ensures that the laser cutting ranging system always moves in the radial direction of the central positioning pin, ensuring the accuracy of the drawn circular outline.

[0022] Preferably, this vertical relationship allows the reading of the variable diameter gauge to directly correspond to the cutting radius, eliminating the need for angle conversion, simplifying the radius adjustment operation, and improving cutting efficiency.

[0023] Preferably, the laser cutting ranging system is parallel to the central positioning pin, ensuring that the trajectory drawn by the laser cutting ranging system on the workpiece surface is a precise circle with the central positioning pin as the center, thus avoiding distortion of the cutting trajectory caused by tilting.

[0024] Preferably, the locking knob can lock the cutting arm at any extended position relative to the slider, preventing the cutting arm from shifting during the cutting process and causing a change in radius, thus ensuring the accuracy and repeatability of the cutting dimensions.

[0025] This method uses a magnetic positioning base to adhere to the surface of a non-planar workpiece. A pair of levels are used to level the base in two orthogonal directions, providing a stable reference platform for all subsequent adjustment steps and solving the problem of difficulty in fixing tools on non-planar surfaces. The sliding action of the sliding rod on the adjustable bracket guide base confirms the precise positioning of the central positioning pin on the non-planar workpiece, eliminating positioning errors caused by bracket installation deviations. The cutting radius is adjusted and locked by sliding the cutting assembly along the central positioning pin, ensuring the accuracy and consistency of the opening size. Finally, the cutting arm rotates and cuts using the tip of the central positioning pin as the rotation center, achieving one-time precise forming of circular openings on non-planar surfaces (curved or inclined surfaces). The entire process eliminates the need for repeated positioning or multiple adjustments, significantly improving the accuracy and efficiency of non-planar openings. Attached Figure Description

[0026] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely schematic to aid in understanding the invention and are not intended to specifically limit the shapes and proportions of the components. In the drawings: Figure 1 This is an overall structural diagram of a non-planar hole-cutting tool as described in Embodiment 1; Figure 2 This is a schematic diagram of a non-planar hole-cutting tool used at the bend of a transformer, as described in Example 1. Figure 3 This is a schematic diagram of the laser cutting ranging system described in Example 1; The components include: 1. Center positioning pin; 2. Cutting assembly; 21. Cutting arm; 211. Variable diameter gauge; 212. Sliding arm; 213. Laser cutting range measuring system; 2131. Laser cutting head; 2132. Laser range measuring scanning head; 2133. Laser diameter measuring scanning head; 2134. Slide rail; 22. Slider; 221. Locking knob; 222. Control rotary motor; 3. Angle adjustment mechanism; 31. Fixed end; 32. Rotating end; 321. Second clamp; 4. Adjustable bracket guide base; 41. First clamp; 5. Magnetic positioning base; 6. Connecting rod; 7. Sliding rod; 8. First level; 9. Second level; 10. Third level; 11. Fourth level. Detailed Implementation

[0027] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0028] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0029] Unless otherwise defined below, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] Example 1 like Figure 1 As shown, this embodiment provides a non-planar hole-cutting tool, including a center positioning pin 1, a cutting component 2, an angle adjustment mechanism 3, an adjustable bracket guide base 4, and a magnetic positioning base 5.

[0031] The magnetic positioning base 5 has a first level 8 on its upper surface and an electromagnet at its bottom. The electromagnet is used to attract and fix the magnetic positioning base 5 to the surface of the workpiece to be drilled. The upper surface of the magnetic positioning base 5 is connected to the adjustable bracket guide base 4 through a connecting rod 6. The adjustable bracket guide base 4 is provided with a first clip 41 for limiting the sliding rod 7.

[0032] The angle adjustment mechanism 3 includes a fixed end 31 and a rotating end 32, which are connected by a pivot. The rotating end 32 has a scale line on its outer wall near the pivot, used to read the rotation angle, and an inner groove to accommodate the fixed end 31. A second level 9 and a third level 10 are mounted on the fixed end 31, respectively positioned on two perpendicular sides. The fixed end 31 is fixedly connected to one side of a sliding rod 7, and the other side of the sliding rod 7 is slidably connected to an adjustable support guide base 4. A fourth level 11 is mounted on the adjustable support guide base 4, and the upper surface of the adjustable support guide base 4 is parallel to the sliding rod 7. The upper surface of the magnetic positioning base 5 is parallel to the sliding rod 7. By comparing the flatness using two levels, it is ensured that the sliding rod 7 is parallel to both the upper surface of the magnetic positioning base 5 and the fixed end 31, so as to ensure that the laser cutting range measuring system 213 falls on the plane formed by the magnetic positioning base 5 and the sliding rod 7 and avoids cutting skew.

[0033] like Figure 1 As shown, the first level 8, the second level 9, the third level 10, and the fourth level 11 can be paired for verification. When the hole-cutting tool is placed vertically, the operator operates from above, activating the first level 8 on the upper surface of the magnetic positioning base 5 and the second level 9 at the fixed end 31 to level in two orthogonal directions parallel to the plane of the upper surface of the magnetic positioning base 5; as shown... Figure 2 As shown, when the hole-cutting tool is placed horizontally, the operator operates from above, using the third level 10 on the upper surface of the fixed end 31 and the fourth level 11 on the adjustable bracket guide base 4 to level in two orthogonal directions perpendicular to the plane on the upper surface of the magnetic positioning base 5.

[0034] The rotating end 32 of the angle adjustment mechanism 3 is slidably connected to the center positioning pin 1, and the center positioning pin 1 is slidably connected to the cutting assembly 2. The cutting assembly 2 is provided with a cutting arm 21. The cutting arm 21 includes a perpendicular variable diameter ruler 211 and a sliding arm 212, and a laser cutting rangefinder system 213 is slidably connected to the sliding arm 212. Figure 3As shown, a slide rail 2134 is provided on one side of the laser cutting ranging system 213. A laser cutting head 2131 and laser ranging scanning heads 2132 and laser diameter scanning heads 2133 are located on either side of the laser cutting head 2131 at its end. The laser ranging scanning head 2132 scans and measures the distance from the surface to be cut to the laser cutting head 2131, ensuring that the laser cutting head 2131 slides up and down on its embedded slide rail 2134 via the sliding arm 212 according to the uneven surface to be cut. The laser diameter scanning head 2133 scans the dimensions of the workpiece after the hole is opened and displays the dimensions through a matching display device, ensuring that the dimensions after cutting can be verified against the drawing. The variable diameter gauge 211 is perpendicular to the center positioning pin 1. The laser cutting ranging system 213 points parallel to the center positioning pin 1.

[0035] The rotating end 32 of the angle adjustment mechanism 3 is provided with a second clip 321 for limiting the center positioning pin 1.

[0036] The fixed end 31 of the angle adjustment mechanism 3 is equipped with a baseline, and the rotating end 32 is equipped with an angle dial scale. It can accurately read and lock the tilt angle of the center positioning pin 1, realize the sequential cutting of multiple holes in a row with the same standard, and improve the tool's adaptability to inclined and curved surfaces and the consistency of the cutting angle.

[0037] The cutting assembly 2 also includes a slider 22; the slider 22 is slidably connected to the center positioning pin 1, and a control rotation motor 222 is provided on the slider 22 for driving the cutting arm 21 to rotate relative to the center positioning pin 1; the cutting arm 21 passes through the variable diameter groove of the slider 22. The slider 22 is provided with a locking knob 221 for limiting the cutting arm 21, and the locking knob 221 is used to adjust the position of the variable diameter ruler 211 relative to the center positioning pin 1; the cutting arm 21 passes through the variable diameter groove of the slider 22.

[0038] The method of using this non-planar hole-cutting tool includes the following steps: S1: Place the magnetic positioning base 5 on the non-planar surface of the workpiece to be drilled, and fix it to the workpiece surface by energizing the bottom electromagnet. Observe the first level 8 and the second level 9 to adjust the adsorption position angle of the magnetic positioning base 5, or observe the third level 10 and the fourth level 11 to adjust the angle of the rotating sliding rod 7 relative to the adjustable bracket guide base 4. S2: Connect the adjustable bracket guide base 4 to the magnetic positioning base 5 via the connecting rod 6, adjust the sliding position of the sliding rod 7 on the adjustable bracket guide base 4 and lock it; S3: The tilt angle of the center positioning pin 1 is adjusted by rotating the rotating end 32 of the angle adjustment mechanism 3 relative to the fixed end 31. S4: Slide the cutting component 2 along the center positioning pin 1 so that the end of the cutting arm 21 reaches the preset opening radius position, and lock the relative position of the cutting component 2 and the center positioning pin 1. S5: Start the cutting assembly 2, with the tip of the center positioning pin 1 as the rotation center, and cut the workpiece by rotating the cutting arm 21 around the center positioning pin 1 to complete the hole opening operation on the non-plane.

[0039] Advantages of this invention: 1. Multi-purpose: It can cut flat circular holes at the bends of transformers and the bevels of the tank cover, and it can also cut spatial curves at the intersection of pipe saddle openings, making it widely applicable.

[0040] 2. When drilling on a bevel, the center of the hole can be precisely located as given in the drawing (based on the reference edge / fold / bevel) by using the reference block and the length adjustment rod, avoiding errors from manual visual inspection; the radius adjustment seat enables precise setting of the hole radius to ensure roundness.

[0041] 3. When cutting pipe intersection lines, the magnetic positioning base and adjustable support guide base can achieve fast and stable installation; the angle adjustment mechanism combined with the cutting arm radius adjustment can adapt to different intersection angles and branch pipe outer diameters.

[0042] 4. The center positioning pin ensures that the reference point is aligned, improving cutting accuracy.

[0043] 5. The overall structure is simple and easy to operate, significantly improving the efficiency and consistency of non-planar cutting.

[0044] The above embodiments are merely one of the implementation methods for achieving the technical solution of the present invention. The scope of protection claimed by the present invention is not limited to this embodiment, but also includes any variations, substitutions, and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention. 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.

Claims

1. A non-planar hole-cutting tool, suitable for ferromagnetic materials to be drilled, characterized in that, The system includes a center positioning pin (1), a cutting assembly (2), an angle adjustment mechanism (3), an adjustable support guide base (4), and a magnetic positioning base (5). The magnetic positioning base (5) has a first level (8) on its upper surface and an electromagnet at its bottom, the electromagnet being used to attract and fix it to the surface of the workpiece to be drilled. The upper surface of the magnetic positioning base (5) is connected to the adjustable support guide base (4) via a connecting rod (6). The angle adjustment mechanism (3) includes a fixed end (31) and a rotating end (32), the fixed end (31) being equipped with a second level (9) and a third level. The level (10) is fixedly connected to one side of a sliding rod (7), and the other side of the sliding rod (7) is slidably connected to the adjustable bracket guide base (4). A fourth level (11) is provided on the adjustable bracket guide base (4), and the upper surface of the adjustable bracket guide base (4) is parallel to the sliding rod (7). The rotating end (32) of the angle adjustment mechanism (3) is slidably connected to the center positioning pin (1), and the center positioning pin (1) is slidably connected to the cutting assembly (2). The cutting assembly (2) is provided with a cutting arm (21).

2. The non-planar hole-cutting tool according to claim 1, characterized in that, The adjustable bracket guide base (4) is provided with a first clip (41) for limiting the sliding rod (7).

3. A non-planar hole-cutting tool according to claim 1, characterized in that, The rotating end (32) of the angle adjustment mechanism (3) is provided with a second clip (321) for limiting the center positioning pin (1).

4. A non-planar hole-cutting tool according to claim 1, characterized in that, A baseline is provided on the fixed end (31), and an angle dial scale is provided on the rotating end (32).

5. A non-planar hole-cutting tool according to claim 1, characterized in that, The cutting assembly (2) further includes a slider (22); the slider (22) is slidably connected to the center positioning pin (1), and a control rotary motor (222) is provided on the slider (22). The control rotary motor (222) is used to drive the cutting arm (21) to rotate relative to the center positioning pin (1); the cutting arm (21) passes through the variable diameter groove of the slider (22).

6. A non-planar hole-cutting tool according to claim 5, characterized in that, The cutting arm (21) includes a variable diameter ruler (211) and a sliding arm (212) that are perpendicular to each other. A laser cutting range measuring system (213) is slidably connected to the sliding arm (212).

7. A non-planar hole-cutting tool according to claim 6, characterized in that, The variable diameter ruler (211) is perpendicular to the center positioning needle (1).

8. A non-planar hole-cutting tool according to claim 6, characterized in that, The laser cutting rangefinder system (213) is parallel to the center positioning needle (1).

9. A non-planar hole-cutting tool according to claim 5, characterized in that, The slider (22) is provided with a locking knob (221) for limiting the cutting arm (21).

10. The method of using a non-planar hole-cutting tool according to claim 1, characterized in that, Includes the following steps: S1: Place the magnetic positioning base (5) on the non-planar surface of the workpiece to be drilled, and fix it to the workpiece surface by energizing the bottom electromagnet. Observe the first level (8) and the second level (9) to adjust the adsorption position angle of the magnetic positioning base (5), or observe the third level (10) and the fourth level (11) to adjust the angle of the rotating sliding rod (7) relative to the adjustable bracket guide base (4). S2: Connect the adjustable bracket guide base (4) to the magnetic positioning base (5) via the connecting rod (6), adjust the sliding position of the sliding rod (7) on the adjustable bracket guide base (4) and lock it; S3: Adjust the tilt angle of the center positioning pin (1) by rotating the rotating end (32) of the angle adjustment mechanism (3) relative to the fixed end (31); S4: Slide the cutting assembly (2) along the center positioning pin (1) so that the end of the cutting arm (21) reaches the preset opening radius position and lock the relative position of the cutting assembly (2) and the center positioning pin (1); S5: Start the cutting assembly (2), with the tip of the center positioning pin (1) as the rotation center, and cut the workpiece by rotating the cutting arm (21) around the center positioning pin (1) to complete the hole opening operation on the non-plane.

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