CN113020421A - Forming method of deep cylindrical part - Google Patents

Forming method of deep cylindrical part Download PDF

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CN113020421A
CN113020421A CN202110266250.XA CN202110266250A CN113020421A CN 113020421 A CN113020421 A CN 113020421A CN 202110266250 A CN202110266250 A CN 202110266250A CN 113020421 A CN113020421 A CN 113020421A
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straight line
radius
forming
depth
pass
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金志浩
高锦张
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Southeast University
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Southeast University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles
    • B21D31/005—Incremental shaping or bending, e.g. stepwise moving a shaping tool along the surface of the workpiece

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Abstract

The invention discloses a forming method of a deep cylindrical part, which is characterized in that the thickness of an original plate is selected after the size of a target cylindrical part is determined, and the radius of the processed plate in the 1 st and 2 nd passes is R, and the depth of the processed plate is H1The two-step conical barrel part; the radius of the processed product is R and the depth of the processed product is H in the 3 rd and 4 th passes2The male cone member of (1); the radius of the 5 th pass is R, and the depth is H3The circular arc bottom cylinder part of (1); the radius of the 6 th pass is R, and the depth is H4The circular arc bottom cylinder part of (1); and finally, processing a workpiece with the radius of R, the depth of H and the arc radius of R in the 7 th pass. When the height-diameter ratio H/D of the target product is 1, the target product is obtained through the steps; and when the height-diameter ratio H/D of the target workpiece is less than 1, removing the redundant height to obtain the target workpiece. The method can be used for forming the deep cylinder part, and has the advantages of simple forming method, low cost and short forming period.

Description

Forming method of deep cylindrical part
Technical Field
The invention relates to a material processing and forming method, in particular to a forming method of a deep cylindrical part.
Background
The traditional cylindrical part is formed by drawing a plate, the drawing times and the intermediate transition shape are calculated according to the size of a cylinder and a related manual, then a die for drawing each time is designed, the formed cylindrical part is limited in forming depth, easy to crack in the machining process, uneven in wall thickness distribution of the part, high in manufacturing cost and long in period.
The incremental forming process adopts the idea of layered manufacturing in the rapid manufacturing technology, disperses a part to be formed into a series of two-dimensional planes to form layer by layer, drives forming equipment to form a plate material by layers and points by a pre-programmed numerical control program, and has short processing period and low cost. However, for the cylindrical parts with larger depth, especially for the cylindrical parts with the forming height-diameter ratio exceeding 0.5, the problems of cracking, bottom sinking and the like can occur, and at present, no systematic method can be used for quickly obtaining the processing path.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a method for forming a deep cylindrical part, which can be used for preparing a cylindrical part with larger depth and has a forming height-diameter ratio of 1.
The technical scheme is as follows: the invention relates to a forming method of a deep cylindrical part, which comprises the following steps:
(1) determining the size of the target cylinder: the forming method can form a straight-wall cylindrical part with the height-diameter ratio of less than or equal to 1, and can cut off redundant height to obtain a finished part for the straight-wall cylindrical part with the height-diameter ratio of less than 1;
(2) determining original sheet thickness t from formability of target barrel0；
(3) The 1 st pass adopts a two-section forming path to process the material with the radius of R and the depth of H1Wherein R is D/2 is the radius of the target cylindrical part, the forming angle of the first straight line is 70-72 degrees, the distance between the starting point of the straight line and the central axis is R, and the vertical distance of the straight line is L1The second section is divided into a straight line and a circular arc part, the forming angle of the straight line is 52-54 degrees, the circular arc is tangent with the straight line and is also tangent with the H1 depth horizontal line at the central axis, and the radius of the circular arc is R1；
(4) The 2 nd pass adopts a two-section forming path to process the material with the radius of R and the depth of H1The two-step conical barrel part: the forming angle of the first section of straight line is 75-77 degrees, the distance between the starting point of the straight line and the central axis is R, and the vertical distance of the straight line is L2The second section is divided into a straight line and an arc part, the forming angle of the straight line is 47-49 degrees, the arc is tangent to the straight line and is also tangent to H1The depth horizontal line is tangent to the central axis and has a radius R2；
(5) The 3 rd pass processing has the radius of R and the depth of H2The convex conical part of (a): the first stage straight line forming angle is 78 °80 DEG, the vertical distance of the straight line is L3The arc is tangent to the straight line and also to H2The depth level is tangent to the central axis and has a radius R3；
(6) The radius of the 4 th pass is R, and the depth is H2The convex conical part of (a): the forming angle of the first section of straight line is 83-85 degrees, and the vertical distance of the straight line is L4The end point of the straight line passing through the second segment of circular arc is also connected with H2The depth horizontal line is tangent to the central axis, the radius of the depth horizontal line is R4, and the transition radius of the straight line and the circular arc is R1；
(7) The radius of the 5 th pass is R, and the depth is H3The circular arc bottom cylinder part: the forming angle of the first section of straight line is 87 degrees to 89 degrees, and the vertical distance of the straight line is L5The end point of the straight line passing through the second segment of circular arc is also connected with H3The depth level is tangent to the central axis and has a radius R5The transition radius of the straight line and the circular arc is r2
(8) The radius of the 6 th pass is R, and the depth is H4The circular arc bottom cylinder part: the first section of straight line is a straight wall part with a vertical distance L7The forming angle of the second section of straight line is 87 degrees to 89 degrees, and the vertical distance of the straight line is L6The arc crosses the end of the line, also with H4The depth horizontal line is tangent to the central axis, the radius of the depth horizontal line is R6, and the transition radius of the straight line and the circular arc is R3；
(9) Processing a workpiece with the radius of R, the depth of H and the arc radius of R in the 7 th pass;
(10) when the height-diameter ratio H/D of the target product is 1, the product obtained in the above step is the target product; and when the height-diameter ratio H/D of the target workpiece is less than 1, removing the part with the excessive height of the target workpiece according to the height-diameter ratio of the target workpiece, and obtaining the target workpiece.
Wherein, the thickness t of the original plate is calculated in the step (2) according to the volume invariance principle0The area of the initial blank participating in deformation in the forming process is pi D2And 4, dividing the surface area of the formed straight-wall cylindrical part into a bottom surface, a fillet and a straight wall, wherein the area of each part is as follows:
bottom surface: s1＝π(D/2-r)2
Fillet: s2＝(πr)2/2+2πr(D/2-r)
Straight wall: s3＝πD(H-r)
According to the volume invariant principle: t is t0×πD2/4＝t×(S1+S2+S3)
Obtaining: t is t0＝4t×(S1+52+S3)/πD2＝t/[D2/(D2-2(4-π)Dr)+4(3-π)r2+4DH]
Substituting r to 0.2D; t0 ═ 4.6336 t.
However, because the bottom of the deep cylinder part has an obvious hard deformation area and the mouth part also has a larger thickness reduction transition area, the thickness of the easily deformable area is reduced more greatly, so that the thickness fluctuation of the whole part is larger, and therefore, the part uniformity is not defined by the theoretical wall thickness deviation, but the feasibility of the path is determined by the minimum thickness. Tests show that a workpiece with the thickness of not less than 0.35mm can be generally processed in experiments when the original blank thickness is 2.5mm, if the original blank thickness is less than 2.5mm, cracking can occur in the forming process, and the wall thickness of the cracked part is less than 0.3mm, so that 0.35mm is set as the minimum wall thickness of the workpiece, the feasibility of a forming path is evaluated by the minimum wall thickness of the formed workpiece when a cylindrical part with the height-diameter ratio of 1 is researched, and the thickness of the used plate needs to be more than 2.5 mm.
Wherein, the processing modes of the steps (3) and (5) are from top to bottom, and the processing modes of the steps (4), (6), (7) and (8) are from bottom to top.
In the 1 st pass of the step (3):
H1＝0.9107D-0.000744(D-52)(D-80)+1.124e-5(D-52)(D-100)(D-80)+0.1429；
L1＝0.5929D-0.0004762(D-52)(D-80)+9.232e-6(D-52)(D-100)(D-80)+1.171；
R1＝(H1-L1-Rtan53°+tan53°×L1/tan71°)/(1-cos53°-tan53°×sin53°)。
the processing mode of the step (3) is from top to bottom, so that the generated track can be ensured to be uniform, and the requirement on the surface smoothness of the workpiece can be met.
Wherein, in the 2 nd pass of the step (4):
L2＝0.625D-0.0005208(D-52)(D-80)+1.406e-5(D-52)(D-100)(D-80)+2；
R2＝(H1-L2-Rtan48°+tan48°×L2/tan76°)/(1-cos48°-tan48°×sin48°)。
the processing mode in the step (4) is from bottom to top, the 2 nd pass mainly deforms the materials of the bottom and the round angle part to promote the taper angle of the bottom to be enlarged, and the bottom deformation and thinning are facilitated by adopting the processing mode from bottom to top, and meanwhile, the straight wall area is not obviously thinned.
Wherein, in the 3 rd pass of the step (5):
L3＝0.6964D+7.44e-5(D-52)(D-80)+9.445e-6(D-52)(D-100)(D-80)-0.2143；
H2＝0.9643D-0.0002976(D-52)(D-80)+5.952e-6(D-52)(D-100)(D-80)+0.3571；
R3＝(R-L3/tan79°)2/[2(H2-L3)]+(H2-L3)/2。
wherein, in the 4 th pass of the step (6):
L4＝0.7857D-0.001265(D-52)(D-80)+1.947e-5(D-52)(D-100)(D-80)-1.357；
H2＝0.9643D-0.0002976(D-52)(D-80)+5.952e-6(D-52)(D-100)(D-80)+0.3571；
R4＝(R-L4/tan84°)2/[2(H2-L4)]+(H2-L4)/2；
and a fillet transition is required between the straight line and the circular arc, and the radius r1 is 0.3D.
Wherein, in the 5 th pass of the step (7):
L5＝0.8929D-0.001935(D-52)(D-80)+2.12e-5(D-52)(D-100)(D-80)-1.929；
H3＝0.9643D-0.0002976(D-52)(D-80)+5.952e-6(D-52)(D-100)(D-80)+0.3571；
R5＝(R-L5/tan88°)2/[2(H3-L5)]+(H3-L5)/2；
and a fillet transition is required between the straight line and the circular arc, and the radius r2 is 0.3D.
Wherein, in the 6 th pass of the step (8):
L6＝0.5D+0.0002083(D-52)(D-80)+2.247e-6(D-52)(D-100)(D-80)+0.3；
H4＝0.9929D-0.000372(D-52)(D-80)+4.233e-6(D-52)(D-100)(D-80)-0.4286；
R6＝(R-L6/tan88°)2/(-0.8D+2H4-2L6)+(H4-0.4D-L6)/2；
in the sixth pass, only the round corner part is processed, so that the forming path is designed to be only half of the straight wall, and L7 is (D-r)/2;
the straight line and the circular arc need round corner transition, and in order to be closer to the round corner set by the target product, the radius r3 is 0.25D.
In the step (9), the processing mode from top to bottom is adopted in the 7 th pass when the straight wall area of the cylindrical part is formed, the processing mode from bottom to top is adopted in the bottom area of the forming cylinder, the straight wall area is formed in the processing mode from top to bottom, the generated track is uniform, the material of the straight wall part can flow to a fillet area which is difficult to form, the forming of the bottom of the cylinder is favorable for the forming of a bottom plane through the processing mode from bottom to top, the material at the center of the bottom can flow from inside to outside, and the phenomenon that the fillet area is broken is avoided.
The forming method can form a cylindrical part with the height-diameter ratio of less than or equal to 1, and for a straight-wall cylindrical part with the height-diameter ratio of less than 1, a finished part can be obtained by cutting off redundant height.
Has the advantages that: the invention provides a forming method of a deep cylindrical part with a height-diameter ratio of 1, which can successfully obtain the deep cylindrical part; the processing process is stable, the workpiece is complete, the wall thickness is relatively uniform, and the mechanical property is good; the surface quality of the workpiece is good, and no scratch is caused; and the forming period is short, and the manufacturing cost is low.
The invention provides a 7-pass path forming method in a breakthrough manner, and overcomes the defects of forming a cylindrical part with a higher height-diameter ratio in the prior art.
Drawings
FIG. 1 is a schematic view of a target deep barrel.
Fig. 2 is a schematic diagram of a deep barrel forming path.
Fig. 3 is a pictorial view of a deep barrel section.
Fig. 4 is a graph of the wall thickness profile of a deep barrel.
Fig. 5 is a schematic diagram of a deep barrel path of a comparative example.
Fig. 6 is a photograph of a deep cylindrical part of a comparative example.
Detailed Description
The present invention will be described in further detail with reference to examples.
The geometric parameter diagram of the target straight-wall cylindrical member in this embodiment is shown in fig. 1, where D is 80mm, H is 80mm, and r is 16mm, where the height/diameter ratio H/D is 1, 1060 aluminum plate with a thickness of 2.5mm is selected as the original plate, and the axial feed rate is 0.4 mm.
The embodiment provides a method for forming the deep cylindrical part, the thickness of an original plate is selected after the size of a target cylindrical part is determined, and the radius of the processed plate in the 1 st and 2 nd passes is R, and the depth of the processed plate is H1The two-step conical barrel part; the radius of the processed product is R and the depth of the processed product is H in the 3 rd and 4 th passes2The male cone member of (1); the radius of the 5 th pass is R, and the depth is H3The circular arc bottom cylinder part of (1); the radius of the 6 th pass is R, and the depth is H4The circular arc bottom cylinder part of (1); and finally, processing a workpiece with the radius of R, the depth of H and the arc radius of R in the 7 th pass. When the height-diameter ratio H/D of the target product is 1, the target product is obtained through the steps; and when the height-diameter ratio H/D of the target workpiece is less than 1, removing the redundant height to obtain the target workpiece.
As shown in fig. 2, the forming process is as follows:
the 1 st pass adopts a two-stage forming path, and the two-stage forming path sequentially forms a product with the radius of R, D, 2 and the depth of H, wherein the R, D, 2 and 40mm are from top to bottom1＝0.9107D-0.000744(D-52)(D-80)+1.124e-5(D-52) (D-100) (D-80) +0.1429 ═ 73mm two-step cone bucket: the forming angle of the first straight line is theta1The distance between the starting point of the straight line and the central axis is R equal to 40mm, and the vertical distance of the first straight line is L1＝0.5929D-0.0004762(D-52)(D-80)+9.232e-6(D-52) (D-100) (D-80) +1.171 ═ 48.6 mm; the second segment is divided into a straight line and a circular arc part, the forming angle of the straight line is 53 degrees, and the circular arc is tangent to the straight line and also tangent to H1The depth horizon is tangent to the central axis and has a radius of:
R1＝(H1-L1-Rtan53°+tan53°×L1/tan71°)/(1-cos53°-tan53°×sin53°)＝9.8mm。
the 2 nd pass adopts a two-section forming path, and the radius R is 40mm and the depth H is processed from bottom to top1Two step awl bucket pieces equal to 73 mm: the forming angle of the first straight line is theta476 °, the straight vertical distance is:
L2＝0.625D-0.0005208(D-52)(D-80)+1.406e-5(D-52) (D-100) (D-80) +2 ═ 52 mm; the second section is divided into a straight line and a circular arc part, the forming angle of the straight line is 48 degrees, and the circular arc is tangent to the straight line and is H1Depth level tangent, radius R2(H1-L2-Rtan48°+tan48°L2/tan76°)/(1-cos48°-tan48°×sin48°)。
The 3 rd pass is processed into a product with the radius of 40mm and the depth of H from top to bottom2＝0.9643D-0.0002976(D-52)(D-80)+5.952e-6(D-52) (D-100) (D-80) +0.3571 ═ 77mm convex cones: the forming angle of the first straight line is 79 degrees, and the vertical distance of the straight line is as follows:
L3＝0.6964D+7.44e-5(D-52)(D-80)+9.445e-6(D-52)(D-100)(D-80)-0.2143＝55.5mm；
the arc is tangent to the straight line and is H2The depth level is tangent to the central axis and has a radius R3＝(R-L3/tan79°)2/[2(H2-L3)]+(H2-L3)/2＝30.4mm。
Processing the workpiece with radius R of 40mm and depth H from bottom to top in the 4 th pass2Convex cone 77 mm: the forming angle of the first straight line is 84 degrees, and the vertical distance of the straight line is as follows:
L4＝0.7857D-0.001265(D-52)(D-80)+1.947e-5(D-52) (D-100) (D-80) -1.357 ═ 61.5 mm; the second arc passes through the end point of the straight line and is connected with H2The depth level line is tangent to the central axis and has a radius R4＝(R-L4/tan84°)2/[2(H2-L4)]+(H2-L4) 44mm for 2mm, and 24mm for 0.3D for the transition radius r1 for straight line and circular arc.
Processing the steel plate with radius R of 40mm and depth H from bottom to top in the 5 th pass3＝0.9643D-0.0002976(D-52)(D-80)+5.952e-6(D-52) (D-100) (D-80) +0.3571 ═ 77.5mm circular arc bottom cylinder: the forming angle of the first straight line is 88 degrees, and the vertical distance of the straight line is as follows:
L5＝0.8929D-0.001935(D-52)(D-80)+2.12e-5(D-52) (D-100) (D-80) -1.929 ═ 69.5mm, and the second arc crosses the end of the straight line and is joined with H3The depth level is tangent to the central axis and has a radius R5＝(R-L5/tan88°)2/[2(H3-L5)]+(H3-L5) 92mm for 2, and the transition radius of the straight line and the circular arc is r2＝0.3D＝24mm。
The 6 th pass is processed to obtain the product with the radius of 40mm and the depth of H4＝0.9929D-0.000372(D-52)(D-80)+4.233e-6(D-52) (D-100) (D-80) -0.4286 ═ 79mm circular arc base cylinder: in the 6 th pass, only the round corner part is processed, so that the forming path is designed to be only half of the straight wall, L7(D-r)/2 ═ 32 mm; the forming angle of the first section of straight line is 84 degrees, and the vertical distance of the straight line is L6＝0.5D+0.0002083(D-52)(D-80)+2.247e-6(D-52) (D-100) (D-80) + 0.3-40.3 mm, the second arc passing through the end of the straight line and being joined with H4The depth horizontal line is tangent to the central axis and has a radius of R6 ═ R-L6/tan88°)2/(-0.8D+2H4-2L6)+(H4-0.4D-L6) 118mm, and the transition radius of the straight line and the circular arc is r 3-0.25D-20 mm.
In the 7 th pass, a top-down processing mode is adopted when a straight wall area of the cylindrical part is formed, a bottom-up processing mode is adopted when a bottom area of the cylinder is formed, and a target workpiece with the radius R of 40mm, the depth H of 80mm and the arc radius R of 16mm is processed.
In the experimental processing, UG software is adopted to carry out three-dimensional modeling on the conical piece, and processing parameters are set in a CAM module of UG, so that a forming path and a corresponding G code are obtained, and the code can be introduced into a special progressive forming machine tool to carry out experiments. And (3) introducing the G code into a machine tool to carry out an experiment, firstly, returning the three-axis coordinates to zero during the experiment, then, carrying out tool setting, setting the coordinate of the tool head when the center of the tool head is positioned at the centers of the outer contour supporting plate and the pressing plate to be 0 in the direction X, Y, and setting the coordinate of the tool head when the lowest point of the tool head just contacts with the plate material to be 0 in the direction Z. After the cutter is finished, the program can be operated to carry out experiments, and the experiments of multiple times are finished step by step, so that the deep cylindrical part shown in figure 3 is finally formed.
The method comprises the steps of cutting a workpiece along an axis, taking the center of a cylinder bottom as a starting point, arranging unit points at the cylinder bottom, a fillet and a straight wall part every 2mm along a radial straight line, taking the center of the cylinder bottom as a starting point, taking the unit points 1-5 as the cylinder bottom part, taking the unit points 6-13 as a fillet part and taking the straight wall part 14-28 as a straight wall part, measuring wall thickness values of the unit points, and obtaining a wall thickness distribution curve of the whole cross section, wherein as shown in figure 4, the wall thicknesses of the processed workpiece bottom and the straight wall part are both more than 0.45mm, the processed workpiece bottom and the processed workpiece straight wall part have good compression resistance, the minimum wall thickness is 0.37mm at the fillet part, a forming area is uniform overall, good mechanical properties are kept, and the obtained workpiece has the advantages of accurate size integrity, good surface quality and no scratch.
In conclusion, the forming method of the invention can form the deep cylinder part, and has the advantages of simple forming method, low cost and short forming period.
Comparative example:
this comparative example processed the same deep barrel as the previous example, but in a different manner. Specifically, a cylindrical part with an aspect ratio of 1 is formed by adopting a 4-pass path, and the forming path is shown in fig. 5:
the 1 st pass adopts a three-section forming path, and three-step conical barrel parts with the radius of 40mm and the depth of 80mm are formed sequentially from top to bottom: the forming angle of the first straight line is 72 degrees, and the vertical distance of the first straight line is 47 mm; the forming angle of the second section of straight line is 45 degrees, the forming angle of the third section of straight line with the straight line vertical distance of 10mm is 68 degrees, the bottom arc is tangent to the straight line, and the radius of the fillet is 8.5 mm.
The 2 nd pass adopts a two-section forming path, and a two-step conical barrel part with the radius of 40mm and the depth of 80 is milled reversely from bottom to top: the forming angle of the first section of straight line is 82 degrees, the vertical distance of the straight line is 66mm, the second section of the straight line is divided into a straight line and an arc part, the forming angle of the straight line is 27 degrees, the arc is tangent to the straight line, and the radius of the fillet is 18 mm.
The 3 rd pass adopts a two-section forming path, and an arc bottom cone barrel part with the radius of 40mm and the depth of 80mm is milled from bottom to top: the forming angle of the first section of straight line is 88 degrees, the vertical distance of the straight line is 70mm, the circular arc is tangent with the horizontal line of the cylinder bottom, and the radius of the circular arc is 100 mm.
In the 4 th pass, a top-down processing mode is adopted when a straight wall area of the cylindrical part is formed, a bottom-up processing mode is adopted when a bottom area of the cylinder is formed, and a target workpiece with the radius of 40mm, the depth of 80mm and the arc radius of 16mm is milled in a reverse mode.
As shown in fig. 6, it is apparent that the deep barrel part formed in the comparative example has cracks during the forming process, and has large thickness unevenness, poor mechanical properties, and poor surface quality.
When the cylindrical part with the height-diameter ratio of 1 in example 1 is formed by adopting the 7-pass path, the forming process parameters of each pass are also important, and when the parameters are not in the range of the invention, the target part also cracks in the forming process, the wall thickness is large in unevenness, and the mechanical property is poor.

Claims (10)

1. A method of forming a deep cylindrical member, comprising the steps of:
(1) determining the size of the target cylinder: the diameter D, the depth H, the arc radius r and the thickness t, wherein r is 0.2D, and the height-diameter ratio satisfies 0 < H/D < 1;
(2) determining the thickness t of the original sheet0；
(3) 1 st pass miningProcessing a two-stage forming path to form a workpiece with a radius of R and a depth of H1The two-step conical barrel part, wherein R is D/2 which is the radius of the target barrel part; the forming angle of the first section of straight line is 70-72 degrees, the distance between the starting point of the straight line and the central axis is R, and the vertical distance of the straight line is L1(ii) a The second section is a straight line and has a radius R1The forming angle of the straight line is 52-54 degrees, the arc is tangent with the straight line and is H1The depth horizontal line is tangent to the central axis;
(4) the 2 nd pass adopts a two-section forming path to process the material with the radius of R and the depth of H1The two-step conical barrel part: the forming angle of the first section of straight line is 75-77 degrees, the distance between the starting point of the straight line and the central axis is R, and the vertical distance of the straight line is L2(ii) a The second section is a straight line and has a radius R2The forming angle of the straight line is 47-49 degrees, and the arc is tangent with the straight line and is H1The depth horizontal line is tangent to the central axis;
(5) the 3 rd pass processing has the radius of R and the depth of H2The convex conical part of (a): the forming angle of the first section of straight line is 78-80 degrees, and the vertical distance of the straight line is L3(ii) a Radius R3Is tangent to the straight line and is H2The depth horizontal line is tangent to the central axis;
(6) the radius of the 4 th pass is R, and the depth is H2The convex conical part of (a): the forming angle of the first section of straight line is 83-85 degrees, and the vertical distance of the straight line is L4(ii) a The second arc passes through the end point of the straight line and is connected with H2The depth horizontal line is tangent to the central axis, and the radius of the circular arc is R4The transition radius of the straight line and the circular arc is r1；
(7) The radius of the 5 th pass is R, and the depth is H3The circular arc bottom cylinder part: the forming angle of the first section of straight line is 87 degrees to 89 degrees, and the vertical distance of the straight line is L5(ii) a The second arc passes through the end point of the straight line and is connected with H3The depth horizontal line is tangent to the central axis, and the radius of the circular arc is R5The transition radius of the straight line and the circular arc is r2；
(8) The radius of the 6 th pass is R, and the depth is H4The circular arc bottom cylinder part: the first straight line being a straight wall partA vertical distance of L7(ii) a The forming angle of the second section of straight line is 87 degrees to 89 degrees, and the vertical distance of the straight line is L6(ii) a The circular arc passes through the end point of the second section of the straight line and is connected with H4The depth horizontal line is tangent to the central axis, and the radius of the circular arc is R6The transition radius of the straight line and the circular arc is r3；
(9) And (5) processing a workpiece with the radius of R, the depth of H and the arc radius of R in the 7 th pass.
2. The method of forming a deep cylindrical member according to claim 1, wherein: when the height-to-diameter ratio H/D of the target product is 1, the obtained product is the target product; and when the height-diameter ratio H/D of the target workpiece is less than i, removing the part with the excessive height of the target workpiece according to the height-diameter ratio of the target workpiece, and thus obtaining the target workpiece.
3. The method of forming a deep cylindrical member according to claim 1, wherein: in step (2), t0＞2.5mm。
4. The method of forming a deep cylindrical member according to claim 1, wherein: in the 1 st pass of the step (3):
H1＝0.9107D-0.000744(D-52)(D-80)+1.124e-5(D-52)(D-100)(D-80)+0.1429；
L1＝0.5929D-0.0004762(D-52)(D-80)+9.232e-6(D-52)(D-100)(D-80)+1.171；
R1＝(H1-L1-Rtan53°+tan53°×L1/tan71°)/(1-cos53°-tan53°×sin53°)。
5. the method of forming a deep cylindrical member according to claim 1, wherein: in the 2 nd pass of the step (4):
L2＝0.625D-0.0005208(D-52)(D-80)+1.406e-5(D-52)(D-100)(D-80)+2；
R2＝(H1-L2-Rtan48°+tan48°×L2/tan76°)/(1-cos48°-tan48°×sin48°)。
6. the method of forming a deep cylindrical member according to claim 1, wherein: in the 3 rd pass of the step (5):
L3＝0.6964D+7.44e-5(D-52)(D-80)+9.445e-6(D-52)(D-100)(D-80)-0.2143；
H2＝0.9643D-0.0002976(D-52)(D-80)+5.952e-6(D-52)(D-100)(D-80)+0.3571；
R3＝(R-L3/tan79°)2/[2(H2-L3)]+(H2-L3)/2。
7. the method of forming a deep cylindrical member according to claim 1, wherein: in the 4 th pass of the step (6):
L4＝0.7857D-0.001265(D-52)(D-80)+1.947e-5(D-52)(D-100)(D-80)-1.357；
H2＝0.9643D-0.0002976(D-52)(D-80)+5.952e-6(D-52)(D-100)(D-80)+0.3571；
R4＝(R-L4/tan84°)2/[2(H2-L4)]+(H2-L4)/2；
r1＝0.3D。
8. the method of forming a deep cylindrical member according to claim 1, wherein: in the 5 th pass of the step (7):
L5＝0.8929D-0.001935(D-52)(D-80)+2.12e-5(D-52)(D-100)(D-80)-1.929；
H3＝0.9643D-0.0002976(D-52)(D-80)+5.952e-6(D-52)(D-100)(D-80)+0.3571；
R5＝(R-L5/tan88°)2/[2(H3-L5)]+(H3-L5)/2；
r2＝0.3D。
9. the method of forming a deep cylindrical member according to claim 1, wherein: in the 6 th pass of the step (8):
L6＝0.5D+0.0002083(D-52)(D-80)+2.247e-6(D-52)(D-100)(D-80)+0.3；
H4＝0.9929D-0.000372(D-52)(D-80)+4.233e-6(D-52)(D-100)(D-80)-0.4286；
R6＝(R-L6/tan88°)2/(-0.8D+2H4-2L6)+(H4-0.4D-L6)/2；
L7＝(D-r)/2；
r3＝0.25D。
10. the method of forming a deep cylindrical member according to claim 1, wherein:
the processing modes of the steps (3) and (5) are from top to bottom, and the processing modes of the steps (4), (6), (7) and (8) are from bottom to top;
in the step (9), the 7 th pass adopts a top-down processing mode when forming the straight wall area of the cylindrical part, and adopts a bottom-up processing mode when forming the bottom area of the cylinder.
CN202110266250.XA 2021-03-11 2021-03-11 Forming method of deep cylindrical part Pending CN113020421A (en)

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CN114011962A (en) * 2021-10-28 2022-02-08 陕西飞机工业有限责任公司 Forming method and device for deformed aluminum alloy closed three-dimensional sheet metal part
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