CN113172300A - Numerical control cutting method for preventing inner hole notch of thick plate part - Google Patents
Numerical control cutting method for preventing inner hole notch of thick plate part Download PDFInfo
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- CN113172300A CN113172300A CN202110361135.0A CN202110361135A CN113172300A CN 113172300 A CN113172300 A CN 113172300A CN 202110361135 A CN202110361135 A CN 202110361135A CN 113172300 A CN113172300 A CN 113172300A
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000005498 polishing Methods 0.000 claims abstract description 8
- 238000010791 quenching Methods 0.000 claims description 8
- 230000000171 quenching effect Effects 0.000 claims description 8
- 238000003466 welding Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 4
- 230000004048 modification Effects 0.000 abstract description 4
- 238000012986 modification Methods 0.000 abstract description 4
- 230000008439 repair process Effects 0.000 abstract description 4
- 229910000831 Steel Inorganic materials 0.000 abstract description 3
- 238000009499 grossing Methods 0.000 abstract description 3
- 239000010959 steel Substances 0.000 abstract description 3
- 230000007547 defect Effects 0.000 description 5
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K7/00—Cutting, scarfing, or desurfacing by applying flames
- B23K7/002—Machines, apparatus, or equipment for cutting plane workpieces, e.g. plates
Abstract
The invention provides a numerical control cutting method for preventing an inner hole notch of a thick plate part. The geometric figures of the parts are modified in batches by programming in the AutoCAD software, arc extinguishing points, slotting compensation and cutting parameters during numerical control flame cutting are reasonably set, arc pits are prevented from occurring at the cutting introduction positions of the inner holes of the thick plate parts, cutting notches are prevented from damaging the parts at the arc extinguishing points during inner hole cutting, and the technical problem that the arc pits occur when the numerical control flame cutting machine cuts the steel plate is solved. According to the invention, the geometric figures of the parts are modified in batch through programming, the manual modification workload is reduced, the arc extinguishing point, the slot compensation and the cutting parameters during numerical control flame cutting are reasonably set, the arc pit at the cutting introduction position of the inner hole of the thick plate part is avoided, the part is prevented from being damaged by a cutting gap at the arc extinguishing point during the inner hole cutting, and the manpower and material resources consumed by manually polishing and smoothing the edge of the inner hole after the cutting gap is subjected to repair welding are reduced. The method is suitable for being used as a method for preventing the inner hole notch of the thick plate part from being cut.
Description
Technical Field
The invention relates to a numerical control flame cutting thick plate part inner hole in the field of ships, in particular to a numerical control cutting method for preventing a thick plate part inner hole notch.
Background
In the process of cutting the hull structure by blanking, plates with the thickness of less than 20mm are generally cut by a numerical control plasma cutting machine, and plates with the thickness of more than 20mm are cut by a numerical control flame cutting machine. The cutting lead is mainly determined by the length and the direction of the cutting lead, and the length of the cutting lead depends on the thickness of a cutting plate.
When the inner hole of the large thick plate part is cut by flame numerical control, due to the unstable state of factors such as cutting voltage, current, cutting gas pressure, a nozzle and the like, an arc pit can appear at the cutting introduction position of the inner hole, namely, a cutting notch is generated at the arc extinguishing point of the inner hole cutting to damage the part, so that the quality problem of the cutting defect of the part is caused, and the thicker the plate is, the higher the probability of the defect is. After the defect occurs, manual repair welding is needed to be carried out on the cutting gap, and then manual polishing smoothing treatment is carried out, so that a large amount of manpower and material resources are consumed. Therefore, the arc-shaped lead wire tangent to the inner hole, the back cutting line and other measures are adopted, the cutting quality improvement effect is not ideal, the cutting gap still occurs, the root cause is that the inner hole cutting introduction position and the inner hole cutting arc quenching point are the same position, the cutting seam has width, and when the cutting torch runs to the arc quenching point, namely, the cutting torch cuts twice at the same position, the cutting gap can be generated at the arc quenching point.
In order to overcome the problem that notches are generated in the inner holes of the thick plate parts by flame cutting, the numerical control flame cutting method for the inner holes of the large thick plate parts needs to be improved, repair welding caused by the notches of the inner holes is avoided, the polishing workload is reduced, and the efficiency and the cutting quality of numerical control flame cutting blanking of the large thick plate parts are improved.
Disclosure of Invention
In order to improve the efficiency and the quality of numerical control flame cutting of large and thick plate parts, particularly to avoid the generation of part cutting defects caused by the fact that a crater appears at the cutting introduction position of the inner hole of the part when a numerical control flame cutting machine is used for cutting the inner hole of the part with the thickness of a steel plate more than 20mm, namely, a cutting notch is generated at the cutting starting point of the inner hole to damage the part, and after the defects occur, the edge of the inner hole needs to be polished and smoothed manually after the inner hole notch is subjected to repair welding, so that a large amount of manpower and material resources are consumed. According to the method, the geometric figures of the parts are modified in batch through programming in the AutoCAD software, arc extinguishing points, slotting compensation and cutting parameters during numerical control flame cutting are reasonably set, arc pits are prevented from occurring at the cutting leading-in positions of inner holes of thick plate parts, cutting notches are prevented from damaging the parts at the arc extinguishing points during inner hole cutting, and the technical problem that the arc pits occur when the numerical control flame cutting machine cuts steel plates is solved.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a numerical control cutting method for preventing a thick plate part inner hole notch optimizes cutting parameter setting by modifying an inner hole profile, and comprises the following steps:
(1) firstly, modifying a part library file, identifying parts with inner holes and thicknesses larger than 30mm in a part library, modifying identified part inner hole geometric figures in batches in AutoCAD software through VBA programming, and decomposing the part geometric figures into straight line segments and circular arc lines; selecting a middle point of a certain straight line or arc line in the inner hole of the part, respectively making two arc lines which are internally tangent to the contour of the inner hole and have the radius of 1Omm at the inner side and the left and right sides of the middle point of the inner hole of the part, wherein the intersection point of the left and right internally tangent circular arc lines is an arc extinguishing point during numerical control flame cutting; for parts with the thickness interval of more than or equal to 30mm and d less than 60mm, the minimum distance between the arc quenching point and the inner hole contour line is 1.5 mm; for parts with the thickness interval of more than or equal to 60mm and d less than 1OOmm, the minimum distance between the arc quenching point and the inner bore contour line is 2 mm; checking redundant geometric figures to be trimmed, and ensuring that a new inner hole profile consisting of two inscribed arc lines, namely a right-side inscribed arc line and a left-side inscribed arc line, and the original inner hole geometric figure is closed; and generating a part by using the modified part geometric figure, replacing the part with the same name in the part library, and updating the part library.
(2) Secondly, based on the updated part library, after the nesting is completed in nesting software, a cutting program is manufactured, linear cutting leads are added at the intersection point of two inscribed circular arcs and in the normal direction of an inner bore contour line, the length of the linear cutting lead is defaulted to be 20mm, the length of the linear cutting lead can be set to be 15mm according to the condition that the thickness of a part is not less than 30mm and d is less than 60mm, the thickness of the part is not less than 60mm and d is not less than 1OOmm, and the length of the linear cutting lead is set to be 20 mm; cutting an inner hole of the part in a clockwise direction, cutting an outer contour of the part in a counterclockwise direction, adding slotting compensation on the right side of the cutting direction, wherein d is more than or equal to 30mm and less than 40mm in thickness of the part, the slotting compensation amount is 1.5mm, d is more than or equal to 40mm and less than 60mm in thickness of the part, the slotting compensation amount is 2mm, d is more than or equal to 60mm and less than 1OOmm in thickness of the part, and the slotting compensation amount is 2.5mm, so that the cutting precision of the ship structure part is guaranteed; and generating a numerical control cutting program by the nesting software.
(3) And secondly, introducing a cutting program into the field numerical control flame cutting machine, checking the states of the voltage, the current, the cutting gas pressure, the nozzle and the like of the cutting machine before cutting, reasonably setting cutting parameters of the numerical control flame cutting machine after ensuring good states, and starting cutting.
(4) And finally, checking the cutting quality of the inner hole contour line, the right side internal tangent arc line and the left side internal tangent arc line after the cutting is finished, polishing the smooth redundant geometric figure to be trimmed at the convex part of the inner hole, and checking the cutting size of the inner hole.
The positive effects are as follows: according to the invention, the geometric figures of the parts are modified in batch through programming, the manual modification workload is reduced, the arc extinguishing point, the slot compensation and the cutting parameters during numerical control flame cutting are reasonably set, the problem of cutting quality caused by arc pits at the cutting introduction position of the inner hole of the thick plate part is avoided, namely, the part is prevented from being damaged by a cutting gap at the arc extinguishing point during the inner hole cutting, the manpower and material resources consumed by manually polishing and smoothing the edge of the inner hole after the welding gap is repaired are reduced, and the cutting quality and efficiency are improved. The numerical control cutting method is suitable for preventing the inner hole notch of the thick plate part.
Drawings
FIG. 1 is a schematic diagram of the cutting of an inner bore of a prior art numerically controlled torch cutting machine;
FIG. 2 is a schematic representation of the internal bore profile of the present invention.
In the figure: 1. an inner bore contour line; 2. a midpoint; 3. the right side is internally tangent with a circular arc line; 4. a left side is internally tangent with a circular arc line; 5. an arc extinguishing point; 6. redundant geometric figures to be trimmed; 7. and cutting the lead wire in a linear manner.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
All embodiments, implementations and features of the invention can be combined with each other in the invention without contradiction or conflict. In the present invention, conventional devices, apparatuses, components, etc. are either commercially available or self-made according to the present disclosure. In the present invention, some conventional operations and apparatuses, devices, components are omitted or only briefly described in order to highlight the importance of the present invention.
Example (b):
according to the figure, a part with the thickness of 55mm and the inner hole diameter of 1OOmm is taken as an example, the cutting step and the process are specifically explained aiming at the modification of the inner hole profile and the setting of cutting parameters.
(1) Firstly, modifying a part library file, identifying a certain part with the thickness of 55mm and the inner hole diameter of 1OOmm in a part library, modifying an identified geometric figure of the inner hole of the part in AutoCAD software, and decomposing the geometric figure of the part into a straight line section and an arc line; selecting a middle point 2 of an inner hole contour line 1 of the part, respectively making a right side inscribed circular arc line 3 and a left side inscribed circular arc line 4 which are inscribed with the middle point and have the radius of 1Omm on the inner side and the left and right sides of the inner hole of the part, wherein the intersection point of the right side inscribed circular arc line 3 and the left side inscribed circular arc line 4 is an arc extinguishing point 5 during numerical control flame cutting, and the minimum distance between the arc extinguishing point 5 and the inner hole contour line 1 is 1.5mm, so that the later polishing workload can be reduced as much as possible on the premise of ensuring that the part is not damaged; checking redundant geometric figures 6 to be trimmed, and ensuring that a new inner hole profile consisting of two inscribed arc lines of a right inscribed arc line 3 and a left inscribed arc line 4, an inner hole profile line 1 and connected geometric figures is closed; and generating a part by using the modified part geometric figure, replacing the part with the same name in the part library, and updating the part library.
(2) Secondly, based on the updated part library, after the nesting is completed in nesting software, a cutting program is manufactured, a linear cutting lead 7 is added at an arc quenching point 5 in the normal direction of an inner bore contour line 1, and the length of the linear cutting lead 7 is set to be 15 mm; cutting an inner hole of the part in a clockwise direction, cutting an outer contour of the part in an anticlockwise direction, and adding a slotting compensation amount of 2mm on the right side of the cutting direction to guarantee the cutting precision of the ship structure part; and generating a teaching and controlling cutting program by the nesting software.
(3) And secondly, introducing a cutting program into the field numerical control flame cutting machine, checking the states of the voltage, the current, the cutting gas pressure, the nozzle and the like of the cutting machine before cutting, and setting cutting parameters of the numerical control flame cutting machine after ensuring good states.
(4) And finally, checking the cutting quality of the inner hole contour line 1, the right inscribed circular arc line 3 and the left inscribed circular arc line 4 of the part after cutting, polishing the redundant geometric figure 6 to be trimmed at the convex part of the inner hole to be smooth, and checking the cutting size of the inner hole.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (1)
1. A numerical control cutting method for preventing an inner hole notch of a thick plate part is characterized by comprising the following steps: optimizing cutting parameter settings by modifying the inner bore profile, comprising the steps of:
1) firstly, modifying a part library file, identifying parts with inner holes and thicknesses larger than 30mm in a part library, modifying identified part inner hole geometric figures in batches in AutoCAD software through VBA programming, and decomposing the part geometric figures into straight line segments and circular arc lines; selecting a middle point (2) of a certain section of straight line or circular arc line in the inner hole contour line (1) of the part, respectively making two right side inscribed circular arc lines 3 and left side inscribed circular arc lines (4) inscribed with the inner hole contour line (1) and having the radius of 1Omm on the inner side of the inner hole contour line (1) and the left and right sides of the middle point (2), wherein the intersection point of the right side inscribed circular arc line (3) and the left side inscribed circular arc line (4) is an arc quenching point (5) during numerical control flame cutting; for parts with the thickness interval of more than or equal to 30mm and d less than 60mm, the minimum distance between the arc quenching point (5) and the inner hole contour line (1) is 1.5 mm; for parts with the thickness interval of more than or equal to 60mm and d less than 1OOmm, the minimum distance between the arc extinguishing point (5) and the inner bore contour line (1) is 2 mm; checking redundant geometric figures (6) to be trimmed, and ensuring that a new inner hole contour consisting of two inner tangent circular arc lines, namely a right inner tangent circular arc line (3) and a left inner tangent circular arc line (4), an inner hole contour line (1) and connected geometric figures is closed; generating parts by the modified part geometric figures, replacing parts with the same name in the part library, and updating the part library;
2) secondly, based on the updated part library, after the nesting is completed in nesting software, a cutting program is manufactured, a linear cutting lead (7) is added at an arc extinguishing point (5) of an intersection point of two inner tangent arc lines of a right inner tangent arc line (3) and a left inner tangent arc line (4) and in the normal direction of an inner bore contour line (1), the length of the linear cutting lead (7) is defaulted to be 20mm, the length of the linear cutting lead (7) can be set to be 15mm according to the part thickness of 30mm or more and d less than 60mm, the part thickness of 60mm or more and d less than 1OOmm, and the length of the linear cutting lead (7) is set to be 20 mm; cutting an inner hole of the part in a clockwise direction, cutting an outer contour of the part in a counterclockwise direction, adding slotting compensation on the right side of the cutting direction, wherein d is more than or equal to 30mm and less than 40mm in thickness of the part, the slotting compensation amount is 1.5mm, d is more than or equal to 40mm and less than 60mm in thickness of the part, the slotting compensation amount is 2mm, d is more than or equal to 60mm and less than 1OOmm in thickness of the part, and the slotting compensation amount is 2.5mm, so that the cutting precision of the ship structure part is guaranteed; then, generating a numerical control cutting program by the nesting software;
3) secondly, a cutting program is introduced into the field numerical control flame cutting machine, the states of the voltage, the current, the cutting gas pressure, the nozzle and the like of the cutting machine are checked before cutting, the cutting parameters of the numerical control flame cutting machine are reasonably set after the good state is ensured, and cutting is started;
4) and finally, checking the cutting quality of the inner hole contour line (1), the right side internal tangent arc line (3) and the left side internal tangent arc line (4) after the cutting is finished, polishing redundant geometric figures (6) to be trimmed at the convex part of the inner hole to be smooth, and checking the cutting size of the inner hole.
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| CN202110361135.0A CN113172300A (en) | 2021-04-02 | 2021-04-02 | Numerical control cutting method for preventing inner hole notch of thick plate part |
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| CN202110361135.0A CN113172300A (en) | 2021-04-02 | 2021-04-02 | Numerical control cutting method for preventing inner hole notch of thick plate part |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114473628A (en) * | 2021-11-18 | 2022-05-13 | 重庆铁马工业集团有限公司 | Numerical control cutting deformation control method for ribbed slabs |
| CN115121965A (en) * | 2022-06-22 | 2022-09-30 | 浙江大学 | Generation method of laser cutting optimized lead |
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2021
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