CN116900635A - Processing method of large-curvature narrow-web thin-wall aluminum alloy part - Google Patents

Processing method of large-curvature narrow-web thin-wall aluminum alloy part Download PDF

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Publication number
CN116900635A
CN116900635A CN202310935387.9A CN202310935387A CN116900635A CN 116900635 A CN116900635 A CN 116900635A CN 202310935387 A CN202310935387 A CN 202310935387A CN 116900635 A CN116900635 A CN 116900635A
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China
Prior art keywords
die
die body
forming
pressing plate
stretch bending
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CN202310935387.9A
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Inventor
王慧
吴华东
李财正
杜建宁
崔丽
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Shenyang Aircraft Industry Group Co Ltd
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Shenyang Aircraft Industry Group Co Ltd
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Priority to CN202310935387.9A priority Critical patent/CN116900635A/en
Publication of CN116900635A publication Critical patent/CN116900635A/en
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D7/00Bending rods, profiles, or tubes
    • B21D7/06Bending rods, profiles, or tubes in press brakes or between rams and anvils or abutments; Pliers with forming dies
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23QDETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q3/00Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23QDETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q2703/00Work clamping
    • B23Q2703/02Work clamping means
    • B23Q2703/10Devices for clamping workpieces of a particular form or made from a particular material

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Abstract

A processing method of a large-curvature narrow-web thin-wall aluminum alloy part belongs to the technical field of aviation aircraft sheet metal part processing. According to the principle of stretch bending forming of the section bar, the section of the plate bending forming material is formed, and the technological processes of numerical control milling blanking, gate pressing forming, stretch bending forming and manual trimming are used for forming and trimming the part by matching with two sets of tools with brand new design, so that the problems that the manual operation strength is high, the unloading is impossible after the part is formed, the molded surface is inaccurate, the outer edge cutting size exceeds allowable deviation and the like are solved, and the product quality and the production efficiency are improved.

Description

Processing method of large-curvature narrow-web thin-wall aluminum alloy part
Technical Field
The invention belongs to the technical field of processing of metal plate parts of aviation aircrafts, and relates to a processing device and a processing method of a large-curvature thin-wall part with a narrow web.
Background
In the scientific research type project of the military machine, more large-curvature narrow-web thin-wall parts exist at the cabin part of the aircraft. The typical characteristic of the part is that the groove section and the appearance are semicircle arc, the bending radius is up to R800mm, the width of the groove section is 20mm, the thickness of the material is thinner, and is generally 1.5mm. The size of the part relates to the theoretical outer edge of the aircraft cabin cover, and the manufacturing precision requirement is high. Because the width of the groove section of the part is smaller and the inside is pore-free, the part cannot be accurately positioned on a tool during sheet metal forming, so that the shape cannot be formed after the part is unfolded and sized, only the woolen can be used for forming, and then the outer edge of the part is cut according to the edge line of the tool, and the typical process flow is 'straight line blanking-manual forming-shape cutting'. Because the part is positioned by the 2-phi 5.2 pins which are added to the ends of the two sides, the position movement easily occurs in the forming process, and the dimensional deviation of the molded surface of the part is caused. The parts are closed angle parts with arc sections exceeding 1/2 circle, and cannot be normally taken out from a tool after being formed, but the parts are required to be forcibly unloaded and the molded surface is corrected again according to the shape sample plate, the molded surface of the parts is changed in the process, and the molded surface is difficult to accurately control according to the sample plate. The outer edge of the part is manually cut after the linear blanking is adopted, the workload is large, the edge size of the part is difficult to control, and the size precision is poor. As a typical convex curve flanging part, the material is forced to flow by repeated material collecting, discharging and material collecting and discharging combination during forming, so that the manual workload is large, a large number of hammer marks are formed on the surface of the part, the surface quality is affected, and fatigue damage is easy to occur. The above problems lead to a great difficulty in forming such parts.
Disclosure of Invention
The invention aims to provide a manufacturing method of a large-curvature narrow-web thin-wall aluminum alloy part, which is characterized in that two sets of tools are designed completely for part forming, and the process flow of numerical control milling blanking, gate press forming, stretch bending forming and manual trimming is used for replacing the process flow of straight line blanking, manual forming and shape cutting. The tooling used by the invention can solve the problems of positioning and unloading of the parts on the tooling, and avoid the problems of incapability of taking out and outer edge deviation after the parts are formed, so that the accurate blanking according to the unfolding dimension of the parts can be realized, the final appearance of the parts is formed according to the tooling, and the manual cutting of edge lines is not required in the subsequent width direction except for the cutting stretch bending allowance of the ends at the two sides. The method comprises the steps of carrying out numerical control milling on a part unfolding material, carrying out gate press forming and stretch bending forming, and finally carrying out manual trimming to form the part into a final shape, thereby finally achieving the purposes of obtaining the shape of the part and improving the production efficiency and the processing precision. The main steps of the part are milling and blanking, gate press forming and stretch bending forming all adopt machining, the labor intensity of operators is low, and the machining precision is high.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
the processing method of the large-curvature narrow-web thin-wall aluminum alloy part comprises numerical control milling blanking, gate press forming, stretch bending forming and manual trimming.
Further, the numerical control milling blanking is specifically as follows:
milling adopts an unfolding digital model of the part as a medium, and the outer edge in an unfolding state is milled for subsequent forming; considering the subsequent forming and adding a stretch bending process, adding allowance for clamping at the two side ends of the part during milling; after the plate milling is finished, filing and deburring are carried out on the processed end face by using a file and sand paper; and (3) comparing the two-dimensional unfolding data set by adopting a sheet metal visual system to test the edge of the sheet metal visual system, so as to ensure that the shape limit deviation meets the test standard.
Further, the gate press forming is specifically as follows:
the gate press forming process aims to manufacture a flat plate blank with the section the same as the final groove section of the part and the linear shape in the length direction for subsequent stretch bending forming; the gate pressing forming process can be completed by adopting a numerical control bending machine and matching with a universal cutter and a template.
Further, a tooling used for stretch bending forming is a stretch bending die and is used for bending the straight strip material with the groove-shaped section into a semi-ring shape after gate press forming; the stretch bending die comprises a carcass 1, a tool hole 2, a clamp hole 3, a pressing plate 4, a die clamping screw 5 and a hanging ring 6;
the molded surface of the tire body 1 is designed according to the inner molded surface of the part, namely the outer side of the molded surface presents a convex shape, and the tire body 1 is provided with a tool hole 2 for aligning and connecting a pressing plate 4 with the tire body 1; through holes are formed in corresponding positions of the carcass 1 and the pressing plate 4 and are used for fixing a die on a stretch bending die platform by using a clamp; the whole appearance of the pressing plate 4 is similar to that of the carcass 1, the outline size is larger than that of the carcass 1, and 2 pressing plates 4 with the same structure are respectively arranged on the upper surface and the lower surface of the carcass 1 and used for limiting blanks in the stretch bending process so as to prevent the blanks from moving in the vertical direction; a gap is formed in the range that the end position between the carcass 1 and the pressing plate 4 is 5mm greater than the part flanging height, so that the blank can flow and the surface can be prevented from being scratched in the stretch bending process; the die closing screw 5 sequentially penetrates through the tire body 1 and the pressing plate 4 and is aligned, screwed and fixed; the hanging ring 6 is respectively arranged on the carcass 1 and the pressing plate 4 and is used for lifting and carrying the mould.
Further, for complex sheet metal parts, a rebound angle is manufactured on a stretch bending die tool, namely, the profile of the structure of the carcass 1 is locally adjusted, so that the influence of rebound on stretch bending forming of parts is reduced.
Further, the tooling adopted in the manual trimming procedure is a 'tire', and is used for processing the stretch-formed semi-finished product to the final shape of the part, and unloading the part from the tooling without changing the molded surface of the part; the 'tire' comprises a die body 7, a locating pin 8, a die matching pin 9, a pressing plate 10, a bolt 11, an inner cover plate 12, a screw 13, a pressing plate nut 14, an outer cover plate 15 and a tightening nut 16; the die body 7 comprises a die body I, a die body II and a die body III;
the die body 7 is used for determining the molded surface of a part during forming, wherein the die body I and the die body III are of arc structures, the molded surfaces of the die body I and the die body III are coordinated with the grooved inner wall of the part, and positioning pins 8 are respectively arranged at the corresponding positions of the two side ends of the part and used for positioning the part during trimming; pin holes are distributed at 4 positions of edge lines of the parts and are matched with pins 11 to prevent position movement during part forming; the die body II is of a strip-mounted structure, and after the part is formed, the die body II can be pulled out from the space between the die body I and the die body III, so that the part is convenient to unload; the die body I, the die body II and the die body III are fixed on an inner cover plate 12 by using a pressing plate 10 after the relative positions of the die pins 9 are determined, and are screwed by using a screw 13 and a pressing plate nut 14; through holes are formed in the middles of the die body I, the die body III and the inner cover plate 12, so that the fixture is convenient to clamp and the weight of the carcass is reduced; the profile of the outer cover plate 15 is coordinated according to the groove-shaped outer wall of the part, and the tightening nut 16 is adopted to fix the part, so that the relative positions among the part, the part and the cover plate are kept unchanged in the part forming process, the part profile is ensured to be accurate, and the part can be unloaded.
The invention has the beneficial effects that: according to the principle of stretch bending forming of the section bar, the section of the plate bending forming material is formed, the process flow of numerical control milling blanking, gate pressing forming, stretch bending forming and manual trimming is used for replacing the process flow of straight line blanking, manual forming and shape cutting, and two sets of tools with brand new design are matched for forming and trimming the part, so that the problems that the manual operation intensity in the forming process is high, the unloading is not carried out after the part is formed, the molded surface is inaccurate, the outer edge cutting size exceeds allowable deviation and the like are solved, and the product quality and the production efficiency are improved.
The manufacturing method can be popularized to other parts in sheet metal manufacturing, and solves the problem of part processing of a large-curvature belt-bent edge structure. In consideration of factors such as strength influence, structural holes such as pin holes are not designed in part of sheet metal parts, particularly, for sheet metal forming, particularly, parts which are thin and long and are provided with bent edges, the parts cannot be positioned without holes in the parts, and the problem of inaccurate appearance caused by blank play easily occurs in hydraulic forming or manual forming.
Drawings
Fig. 1 is a part outline view.
Fig. 2 is a profile view after gate forming, in which (a) is a front view and (b) is a side view.
Fig. 3 is a drawing of a drawing die structure in which (a) is a front view and (b) is a side view.
Fig. 4 is a view showing a tire structure, in which (a) is a front view and (b) is a side view.
In the figure: 1 matrix, 2 tool holes, 3 clamp holes, 4 pressing plates, 5 die closing screws, 6 lifting rings, 7 die bodies, 8 positioning pins, 9 die closing pins, 10 pressing plates, 11 bolts, 12 inner cover plates, 13 screws, 14 pressing plate nuts, 15 outer cover plates and 16 tightening nuts.
Detailed Description
The specific scheme for processing the large-curvature narrow-web thin-wall aluminum alloy part is as follows:
the processing method adopts a gate press forming and stretch bending forming method to realize the manufacture of the large-curvature narrow-web thin-wall aluminum alloy part and improve the production efficiency and the surface quality by blanking in a numerical control milling mode, and the specific steps are simply introduced as follows.
Fig. 3 and 4 show a processing method of a large-curvature narrow-web thin-wall aluminum alloy part, and the processing method is realized based on a stretch bending die and a mold. The stretch bending die structure comprises a carcass 1, a tool hole 2, a clamp hole 3, a pressing plate 4, a die clamping screw 5 and a hanging ring 6. The tire structure comprises a mold body 7, a positioning pin 8, a matched mold pin 9, a pressing plate 10, a bolt 11, an inner cover plate 12, a screw 13, a pressing plate nut 14, an outer cover plate 15 and a tightening nut 16; the die body 7 comprises a die body I, a die body II and a die body III.
The stretch bending die is used for bending the straight strip with the groove-shaped section into a semi-ring shape after gate press forming. The tyre body profile of the structure 1 is designed according to the inner profile of the part, namely the outer side is in a convex shape, and 3 tool holes 2 are formed at proper positions of the tyre body and used for aligning and connecting the pressing plate and the tyre body. In order to facilitate the installation and fixation of the die on the stretch bender, through holes of 4-phi 135mm are milled at the corresponding positions of the carcass and the pressing plate and are used for fixing the die on a stretch bending die platform by using a clamp. The whole appearance of the pressing plate 4 is similar to that of a tire body, the outline size is slightly larger than that of the tire body (generally, the pressing plate is only required to be 20 mm), 2 identical structures are adopted to be respectively arranged on the upper surface and the lower surface of the tire body, the pressing plate is used for limiting blanks in the stretch bending process, the blanks are prevented from moving in the vertical direction, a gap of 0.5mm can be formed in the range that the end position between the tire body and the pressing plate is larger than the part crimping height by 5mm, and the blanks can flow and scratch surfaces are prevented in the stretch bending process conveniently. The mold clamping screw 5 aligns the tire body and the pressing plate, and tightens and fixes the tire body and the pressing plate. The hanging ring 6 is respectively arranged on the carcass and the pressing plate and used for hanging and carrying the die. For complex sheet metal parts, the rebound angle is manufactured on the tooling (namely, the profile of the carcass structure 1 is locally adjusted), so that the influence of rebound on the stretch-bending forming of the parts is reduced.
The mould body of the 'mould body' is used for determining the molded surface of a part during forming, wherein the mould body I and the mould body III are arc-shaped structures, the molded surface is coordinated with the grooved inner wall of the part, and 1-phi 5 locating pins 8 are respectively arranged at the corresponding positions of the two side ends of the part and used for locating the part during trimming. The part edge line positions are distributed with pin holes at 4, and the pin holes are matched with the pins 11 to prevent position movement during part forming. The die body II is of a strip-mounted structure, and after the part is formed, the die body II can be pulled out from the space between the die body I and the die body III, so that the part is convenient to unload. The die body I, the die body II and the die body III are fixed on an inner cover plate 12 by using a pressing plate 10 after the relative positions of the die pins 9 are determined, and are screwed by using a screw 13 and a pressing plate nut 14. Through holes are formed in the middles of the die body I, the die body III and the inner cover plate 12, so that the fixture is convenient to clamp and the weight of the tire body is reduced. All the above structures constitute the carcass of a molded tire. The profile of the outer cover plate 15 is coordinated according to the groove-shaped outer wall of the part, and the tightening nut 16 is adopted to fix the part, so that the relative positions among the part, the part and the cover plate are kept unchanged in the part forming process, the part profile is ensured to be accurate, and the part can be unloaded.
Furthermore, the structure is manufactured according to the data set, the manufacturing tolerance of the molded surface is +/-0.1 mm, the roughness of the working molded surface is not higher than Ra1.6, and the hanging ring is used for lifting and carrying the die.
The processing method of the curvature narrow web thin-wall aluminum alloy part comprises the following steps:
step one: milling and blanking.
And milling the unfolded shape (rectangular strip shape, 200mm allowance is respectively added at two ends) of the part according to a two-dimensional unfolded data set by adopting a numerical milling mode, and ensuring that the limit deviation of the shape is not more than 0.5mm by adopting the processing precision. And milling and selecting two tooth milling cutters with helix angles smaller than 45 degrees, so that chip removal is facilitated, the drill bit selects a vertex angle of 90-110 degrees, and the two sides of the vertex angle are symmetrical. After the plate milling is finished, the processing end face is filed and deburred by using files and sand paper. Comparing the two-dimensional unfolding data set by adopting a sheet metal visual system to test the edge of the two-dimensional unfolding data set, so as to ensure that the shape limit deviation meets the test standard;
step two: and (5) gate pressing and forming.
The procedure is used for manufacturing the milled flat blank into an outline with the same section as the final groove section of the part and the linear shape in the length direction, and the outline is used for subsequent stretch bending forming. The forming is completed by adopting a numerical control bending machine and a universal cutter, the flat plate blank is bent into an L-shaped section by first gate pressing, and is bent into a concave section by second forming. Firstly, selecting a proper knife switch and a knife rest notch corresponding to the knife switch according to the bending radius and the bending angle of the section of the part, and installing the knife switch on a fixed block of a numerical control bending machine to realize the connection of the knife switch and a sliding block of the bending machine. And setting the position of a rear baffle of the bending machine and the bottom dead center of the stroke of the sliding block according to the bending height and the bending angle shown by the template. And then, feeding the flat blank, attaching the bottom surface of the plate to the upper surface of the cutter pillow, attaching the end surface of the plate to the rear baffle plate, stepping on a die closing switch of the equipment, and sliding the sliding block downwards to realize die closing. Loosening a die closing switch, taking out a part after the sliding block ascends, measuring the bent edge height and the bending angle, entering a subsequent procedure if the size meets the requirement, and adjusting the position of a rear baffle of the bending machine and the bottom dead center of the sliding block stroke after reshaping until the size is qualified if the size is unqualified;
step three: stretch bending and forming.
First, a "stretch bending die" is secured to a stretch bender platform by means of a securing pin on the stretch bender platform. Then, a concave jaw is selected according to the shape of the groove-shaped section of the part, two ends of the blank are clamped in the jaw, the clamping amount of the two ends is not less than 100mm, and the central part of the blank is propped against the bending central part of the stretch bending die. And adjusting the tension value, wherein the blank moves along with the jaw, the jaw and the stretch bending die generate relative displacement, and the blank bends until the blank is completely tightly attached to the stretch bending die. The steps are finished, the pulling force is unloaded, and the part (semi-finished product) is taken out along the direction vertical to the molded surface of the stretch bending die;
step four: and (5) manually finishing.
Firstly, the tire is horizontally placed on a platform, a tightening nut 16 is pulled out, an outer cover plate 15 is separated from a tire body (formed by a mold body I, a mold body II, a mold body III, a pressing plate 10 and an inner cover plate 12), a pressing plate nut 14 is tightened, and the mold body I, the mold body II, the mold body III, the pressing plate 10 and the inner cover plate 12 are ensured to be clamped. And placing the blank after stretch bending forming between an outer cover plate and a matrix (formed by a matrix I, a matrix II, a matrix III, a pressing plate 10 and an inner cover plate 12), drilling positioning holes phi 5.2 at the ends of two sides according to the positions of the positioning pins 9, and fixing the positioning holes by using the positioning pins. Tightening the tightening nut 16 to ensure that the position between the cover plate and the carcass remains unchanged during the forming process;
secondly, trimming the blank by adopting a manual trimming mode to be tightly attached to the die body 7 (the die body I, the die body II and the die body III) and manufacturing two end heads of the part to sink. In the trimming process, the distance between the edges of two sides of the part and the plug 11 on the die body needs to be observed, and if the two sides are contacted with the plug, the blank is not moved in the forming process, and the external dimension of the part can be ensured; if one side of the edge of the part is in clearance with the bolt, and the other side of the part is embedded into the bolt, the blank is indicated to have position movement, and the blank needs to be readjusted.
After the part is tightly attached to the fixture, the tightening nut 16 is pulled out, the outer cover plate 15 is separated from the tire body by a certain distance, and the outer cover plate is taken out from the upper part of the fixture. Unscrewing the clamp plate nut 14, detaching the clamp plate 10, extracting the die body II from the side, and then moving the die body I and the die body III inwards for a certain distance respectively, wherein the part can be removed from the tool in a free state;
step five: and (5) quenching the parts.
The quenching treatment is carried out on the part, so as to improve the strength and the hardness of the part. After the quenching of the parts is finished, the parts are kept at room temperature for 120-240 h, and are sent to a physical and chemical department to conduct conductivity or hardness inspection according to the standard, wherein the conductivity acceptance value is 18.5MS/m-20MS/m, and when the conductivity is unqualified, the acceptance according to the hardness is allowed, and the acceptance value is more than or equal to 62HRB. If the conductivity and the hardness are not detected to be qualified, repeating the steps to perform heat treatment until the physicochemical properties are qualified, and entering the subsequent procedures;
step six: and (5) trimming, quenching and deforming.
The quenched part is placed between an outer cover plate and a tire body (formed by a mold body I, a mold body II, a mold body III, a pressing plate 10 and an inner cover plate 12), and positioning pins 8 are inserted into the ends of two sides. Tightening the tightening nut 16 to ensure that the relative position between the cover plate and the carcass remains unchanged during the part trimming process; and the deformed position of the part is manually trimmed by tools such as a hammer, an aluminum hammer or a rubber beating plate, so that the fitting of the part and the tool is tight. After finishing, the screw nut 16 is pulled out and screwed, the outer cover plate 15 is separated from the carcass by a certain distance, and the outer cover plate is taken out from the upper part of the tool. Unscrewing the clamp nut 14, removing the clamp 10, extracting the die body II from the side, and then moving the die body I and the die body III inwards for a certain distance respectively, wherein the part can be taken out from the tool in a free state.
Step seven: removing ear pieces.
Cutting and removing lugs for positioning the ends of two sides of the part, and filing and deburring to ensure that the roughness of the processed end surface meets the design requirement;
step eight: and (5) surface treatment of the parts.
Anodizing and painting the part to improve the corrosion resistance of the part; and (3) completing the steps to obtain the final state part object.

Claims (6)

1. The processing method of the large-curvature narrow-web thin-wall aluminum alloy part is characterized by comprising numerical control milling blanking, gate press forming, stretch bending forming and manual trimming.
2. The method for processing the large-curvature narrow-web thin-wall aluminum alloy part according to claim 1, wherein the numerical control milling blanking is specifically as follows:
milling adopts an unfolding digital model of the part as a medium, and the outer edge in an unfolding state is milled for subsequent forming; considering the subsequent forming and adding a stretch bending process, adding allowance for clamping at the two side ends of the part during milling; after the plate milling is finished, filing and deburring are carried out on the processed end face by using a file and sand paper; and (3) comparing the two-dimensional unfolding data set by adopting a sheet metal visual system to test the edge of the sheet metal visual system, so as to ensure that the shape limit deviation meets the test standard.
3. The method for processing a large-curvature narrow-web thin-wall aluminum alloy part according to claim 1 or 2, wherein the gate press forming is specifically as follows:
the gate press forming process aims to manufacture a flat plate blank with the section the same as the final groove section of the part and the linear shape in the length direction for subsequent stretch bending forming; the gate pressing forming process can be completed by adopting a numerical control bending machine and matching with a universal cutter and a template.
4. The method for processing the large-curvature narrow-web thin-wall aluminum alloy part according to claim 1 or 2, wherein a tooling used for stretch bending forming is a stretch bending die and is used for bending a straight bar with a groove-shaped section into a semi-ring shape after gate press forming; the stretch bending die comprises a carcass (1), a tool hole (2), a clamp hole (3), a pressing plate (4), a die clamping screw (5) and a hanging ring (6);
the molded surface of the tire body (1) is designed according to the inner molded surface of the part, namely, the outer side of the molded surface is convex, and a tool hole (2) is formed in the tire body (1) and is used for aligning and connecting a pressing plate (4) with the tire body (1); through holes are formed in corresponding positions of the carcass (1) and the pressing plate (4) and are used for fixing a die on a stretch bending die platform by using a clamp; the overall appearance of the pressing plate (4) is similar to that of the carcass (1), the overall size is larger than that of the carcass (1), and 2 pressing plates (4) with the same structure are respectively arranged on the upper surface and the lower surface of the carcass (1) and used for limiting blanks in the stretch bending process and preventing the blanks from moving in the vertical direction; a gap is formed in the range that the end position between the carcass (1) and the pressing plate (4) is 5mm greater than the part flanging height, so that the blank can flow and the surface can be prevented from being scratched in the stretch bending process; the die closing screw (5) sequentially penetrates through the tire body (1) and the pressing plate (4) and is aligned, screwed and fixed; the lifting rings (6) are respectively arranged on the tire body (1) and the pressing plate (4) and are used for lifting and carrying the mold.
5. The method for processing the large-curvature narrow-web thin-wall aluminum alloy part according to claim 4, wherein for complex sheet metal parts, a rebound angle is manufactured on a stretch bending die tool, namely, the structure of a carcass (1) is subjected to profile local adjustment, so that the influence of rebound on stretch bending forming of the part is reduced.
6. The method for processing the large-curvature narrow-web thin-wall aluminum alloy part according to claim 1 or 2, wherein a tooling adopted in the manual trimming procedure is a "tire" for realizing processing of a stretch-formed semi-finished product to a final shape of the part and unloading of the part from the tooling without changing the profile of the part; the tyre comprises a mould body (7), a positioning pin (8), a mould matching pin (9), a pressing plate (10), a bolt (11), an inner cover plate (12), a screw (13), a pressing plate nut (14), an outer cover plate (15) and a tightening nut (16); the die body (7) comprises a die body I, a die body II and a die body III;
the die body (7) is used for determining the molded surface of the part during forming, wherein the die body I and the die body III are of arc structures, the molded surfaces of the die body I and the die body III are coordinated with the grooved inner wall of the part, and positioning pins (8) are respectively arranged at the corresponding positions of the two side ends of the part and used for positioning the part during trimming; the part edge line position distribution 4 is provided with a bolt hole which is matched with a bolt (11) to prevent the position from moving when the part is formed; the die body II is of a strip-mounted structure, and after the part is formed, the die body II can be pulled out from the space between the die body I and the die body III, so that the part is convenient to unload; the die body I, the die body II and the die body III are fixed on an inner cover plate (12) by using a pressing plate (10) after the relative positions of the die pins (9) are determined, and are screwed by using a screw (13) and a pressing plate nut (14); through holes are formed in the middles of the die body I, the die body III and the inner cover plate (12), so that the fixture is convenient to clamp, and the weight of a tire body is reduced; the profile of the outer cover plate (15) is coordinated according to the groove-shaped outer wall of the part, and a tightening nut (16) is adopted to fix the part with the carcass, so that the relative positions among the carcass, the part and the cover plate are kept unchanged in the part forming process, the part profile is ensured to be accurate, and the part can be unloaded.
CN202310935387.9A 2023-07-28 2023-07-28 Processing method of large-curvature narrow-web thin-wall aluminum alloy part Pending CN116900635A (en)

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