CN114227149B - High-precision machining tool and method for titanium alloy hemispherical assembly welding piece - Google Patents
High-precision machining tool and method for titanium alloy hemispherical assembly welding piece Download PDFInfo
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- CN114227149B CN114227149B CN202111375681.6A CN202111375681A CN114227149B CN 114227149 B CN114227149 B CN 114227149B CN 202111375681 A CN202111375681 A CN 202111375681A CN 114227149 B CN114227149 B CN 114227149B
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- 238000003466 welding Methods 0.000 title claims abstract description 93
- 238000003754 machining Methods 0.000 title claims abstract description 68
- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000012545 processing Methods 0.000 claims abstract description 59
- 238000003825 pressing Methods 0.000 claims description 26
- 230000003014 reinforcing effect Effects 0.000 claims description 8
- 238000005520 cutting process Methods 0.000 claims description 7
- 238000003801 milling Methods 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 6
- 238000003672 processing method Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P23/00—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
- B23P23/02—Machine tools for performing different machining operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, 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
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
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Abstract
The invention discloses a high-precision machining tool for a titanium alloy hemispherical assembly welding piece and a machining method thereof, the high-precision machining tool comprises a base and a plurality of supporting seats, wherein the supporting seats are arranged on the base and distributed around the center of the base, an arc-shaped notch is formed on one side of each supporting seat close to the center of the base, the arc-shaped notch of each supporting seat forms an accommodating space for accommodating the hemispherical assembly welding piece, a plurality of groups of supporting adjusting bolts are distributed on the arc-shaped surface at the arc-shaped notch, the supporting adjusting bolts are distributed along the length direction of the arc-shaped surface, and the outer ends of the supporting adjusting bolts are contacted with the hemispherical assembly welding piece to adjust the space pose state of the hemispherical assembly welding piece to the position of a machining coordinate system. The technical scheme is aimed at the processing design of the large-specification titanium alloy hemispherical assembly welding piece, reasonably arranges the processing sequence, specially designs the processing tool, and solves the processing difficulty of the large-specification high-precision titanium alloy hemispherical assembly welding piece.
Description
Technical Field
The invention belongs to the technical field of machining of metal structural parts, and particularly relates to a high-precision machining tool and a machining method of a titanium alloy hemispherical assembly welding part.
Background
In order to bear huge seawater pressure, the deep sea manned cabin is usually made of light and high-strength titanium alloy as a main material, and is generally in a spherical structure, and is usually manufactured into a whole spherical structure by adopting a welding mode of two hemispherical assemblies. Because manned cabin size is great, and the diameter can reach 2m, and whole blank weight reaches 3.5t, and is very strict to whole true sphericity, control system interface and watertight hatch department dimensional accuracy requirement, and the viscosity of titanium alloy itself and the intensity of gigapascal level, cause very big degree of difficulty to its machining, on the one hand must guarantee to fix on the lathe bench that can be stable when processing the interior sphere, on the other hand need guarantee the precision of its every size. Because the structures such as the hole seat and the connector for welding on the hemisphere in the project can only be processed in a milling mode, compared with a turning mode, the precision control and the processing parameters are more complex, the processing allowance of part of positions is only 2mm, and the leveling and alignment reference difficulty is very high.
The prior art discloses a high-precision machining method of a titanium alloy spherical shell, but the machining object is pure spherical, no welding component exists, and the machining method can be used for turning, so that the method is not suitable for welding hemispherical components in the project. In addition, in the search of literature and patent technology, the previous work method and tooling for the titanium alloy hemispherical assembly welding piece have not found related research reports.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a high-precision machining tool and a machining method for a titanium alloy hemispherical assembly welding piece.
The invention aims to provide a high-precision machining tool for a titanium alloy hemispherical assembly welding piece, which comprises a base and a plurality of supporting seats, wherein the supporting seats are arranged on the base and distributed around the center of the base, an arc-shaped notch is formed on one side of each supporting seat close to the center of the base, the arc-shaped notches of all the supporting seats form an accommodating space for accommodating the hemispherical assembly welding piece, a plurality of groups of supporting adjusting bolts are distributed on the arc-shaped surface at the arc-shaped notch, the supporting adjusting bolts are distributed along the length direction of the arc-shaped surface, and the outer ends of the supporting adjusting bolts are contacted with the hemispherical assembly welding piece to adjust the space pose state of the hemispherical assembly welding piece to the position of a machining coordinate system.
Preferably, the base comprises an annular seat and a center seat, wherein the annular seat is used for installing the supporting seat, and the center seat is arranged at the center of the annular seat and is used for supporting the bottom of the hemispherical assembly welding piece.
Preferably, a spherical groove is formed in the upper end surface of the center seat.
As the preferred scheme, the supporting seat includes a backup pad, two bed plates and two reinforcing plates, backup pad perpendicular to annular seat's up end, the bed plate sets up in the lower edge both sides of backup pad and rather than perpendicular, has seted up the screw on the bed plate for pass through bolt fixed connection with annular seat, the reinforcing plate is vertical to the symmetry sets up in the both sides of backup pad.
As the preferable scheme, support adjusting bolt includes adjusting screw and lock nut, be provided with the screw hole on the arcwall face, adjusting screw's lead screw screws in the screw hole on the arcwall face, lock nut wears to establish on adjusting screw to realize adjusting screw's locking or loosen the regulation.
As an optimal scheme, the ring-shaped seat between the adjacent supporting seats is provided with a hanging ring for hanging the processing tool.
As a preferable scheme, the inner side of the lifting ring is provided with a strip-shaped hole, and the length direction of the strip-shaped hole is arranged along the radial direction of the annular seat.
The invention further aims to provide a high-precision machining method of the titanium alloy hemispherical assembly welding piece, wherein the hemispherical assembly welding piece is obtained by firstly carrying out rough machining on an inner spherical surface of the hemispherical assembly welding piece, then carrying out rough machining and finish machining on an outer spherical surface of the hemispherical assembly welding piece in sequence, then detecting the size of the outer spherical surface through three coordinates, carrying out fine adjustment on a coordinate system according to a detection result, and finally carrying out finish machining on the inner spherical surface of the hemispherical assembly welding piece.
Preferably, the high-precision machining method of the hemispherical assembly welding part comprises the following steps of:
step one, welding pressing plates with the same number as the supporting seats on the outer edges of hemispherical equatorial planes of the hemispherical assembly welding parts, wherein the pressing plates are respectively in one-to-one correspondence with the supporting seats;
step two, milling a reference hole on the pressing plate;
thirdly, performing three-dimensional laser scanning on the hemispherical assembly welding piece to generate a solid, and determining a processing coordinate system and processing allowance of each part by comparing the solid with a processing model of the hemispherical assembly welding piece;
Fourthly, placing the hemispherical assembly welding piece on a processing tool, wherein the inner spherical surface of the hemispherical assembly welding piece faces upwards, adjusting the position of the hemispherical assembly welding piece to the position of a processing coordinate system by using a supporting adjusting bolt and a horizontal adjusting bolt, fastening a pressing plate welded on the hemispherical equatorial plane by using a bolt, performing rough processing on the inner spherical surface by using a numerical control gantry type triaxial machine tool, and after the processing procedure is finished, leaving 2mm of processing allowance on the inner spherical surface;
Turning over the hemispherical assembly welding piece, namely, turning up the outer spherical surface of the hemispherical assembly welding piece, and adopting a numerical control gantry type triaxial machine tool to carry out rough machining on the outer spherical surface, wherein the machining allowance of the outer spherical surface is 2 mm;
step six, semi-finishing of the outer spherical surface is carried out on a numerical control gantry type five-axis machine tool, and the machining allowance of the outer spherical surface is remained by 0.5 mm;
Step seven, performing finish machining of an outer spherical surface on a numerical control gantry type five-axis machine tool to a required size;
Step eight, checking the size of the outer sphere on three coordinates, measuring the radius and the sphere center position of the outer sphere, and performing fine adjustment on a coordinate system according to the actual measurement result;
Step nine, placing the hemispherical assembly welding piece on a processing tool, determining processing coordinates according to the coordinate system adjusted in the step seven, and performing semi-finishing of an inner spherical surface on a gantry type five-axis machine tool, wherein the residual processing allowance of the inner spherical surface is 0.5 mm;
step ten, carrying out finish machining of the inner spherical surface on a gantry five-axis machine tool to a required size;
and step eleven, milling an equatorial plane, and simultaneously machining and removing the pressing plate welded by the hemispherical assembly welding piece.
Preferably, the processing parameters in the seventh and tenth steps are as follows: the spindle rotation speed is 1200r/min, the cutting speed is 1000mm/min, the cutting depth is 0.5mm, and the feeding amount is 0.2mm.
Advantageous effects
By improvement, the invention designs a special processing tool, which obviously improves the reference adjustment precision and the processing precision and solves the processing difficulty of the large-specification high-precision titanium alloy hemispherical assembly welding piece. The hemispherical assembly welding piece is placed in the accommodating cavity of the processing tool in an upward mode, the inner spherical surface of the hemispherical assembly welding piece faces upward, the outer spherical surface of the hemispherical assembly welding piece is contacted with the supporting adjusting bolt, the space pose state of the hemispherical assembly welding piece can be adjusted in different directions by the supporting adjusting bolt, the hemispherical assembly welding piece is adjusted to a processing coordinate system position, the processing size and the processing precision are guaranteed, and after the position is adjusted, the pressing plate is fixedly connected with the upper end of the supporting seat, and the hemispherical assembly welding piece is positioned.
According to the machining method of the second scheme, the gantry three-axis machine tool and the gantry five-axis machine tool with high-precision heavy cutting force are adopted to carry out machining in a matched mode, and the machining sequence is optimized.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a perspective view of a tooling assembly of the present invention;
FIG. 2 is a top view of the tooling of the present invention;
FIG. 3 is a perspective view of a hemispherical weldment of the present invention;
FIG. 4 is a top view of the hemispherical weldment of the present invention;
FIG. 5 is a first view of the processing state of the hemispherical weldment of the present invention;
FIG. 6 is a second view of the semi-spherical weldment of the present invention in a processed state;
FIG. 7 is a block diagram of a support adjustment bolt in accordance with the present invention;
The marks in the figure: 1. the support seat, 11, the support plate, 111, the horizontal screw hole, 112, the fastening hole, 12, the base plate, 13, the reinforcing plate, 2, the support adjusting bolt, 21, the adjusting screw, 22, the lock nut, 3, the annular seat, 4, the center seat, 5, the rings, 6, the bar hole, 7, the fastening bolt, 10, the hemispherical assembly welding piece, 101, the pressing plate, 102, the hemispherical equatorial plane, 103 and the reference hole.
Detailed Description
The invention is described in detail below by way of exemplary embodiments. It is to be understood that elements, structures and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.
It should be noted that: unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. As used in the specification and claims of this application, the terms "a," "an," and "the" and similar referents are not to be construed to limit the scope of at least one. The word "comprising" or "comprises", and the like, indicates that elements or items listed thereafter or equivalents thereof may be substituted for elements or items thereof in addition to those listed thereafter or equivalents thereof without departing from the scope of the word "comprising" or "comprising".
As shown in fig. 1 and 2, the embodiment provides a high-precision machining tool for a titanium alloy hemispherical assembly welding piece, which comprises a base, wherein the base comprises an annular base 3 and a center base 4, the upper part of the annular base 3 is used for installing a supporting base 1, the center base 4 is arranged at the center of the annular base 3, and a spherical groove is formed in the upper end face of the center base 4 and is used for supporting the bottom of the hemispherical assembly welding piece 10.
In this embodiment, the supporting seat 1 includes a supporting plate 11, two base plates 12 and two reinforcing plates 13, the supporting plate 11 is perpendicular to the upper end surface of the annular seat 3, the base plates 12 are disposed on two sides of the lower edge of the supporting plate 11 and perpendicular thereto, screw holes 121 are formed in the base plates 12 and are fixedly connected with the annular seat 3 through fastening bolts 7, the reinforcing plates 13 are vertically disposed and symmetrically disposed on two sides of the supporting plate 11, and the reinforcing plates 13 are perpendicular to the base plates 12 and the supporting plate 11. A fastening hole 112 is formed in the upper end surface of the support plate 11 to correspond to the reference hole 103, and the support base 1 and the pressing plate 101 are fixedly coupled by bolts.
According to the scheme, 5 supporting seats 1 are distributed around the center of the base, an arc notch is formed on one side, close to the center of the base, of each supporting seat 1, an accommodating space for accommodating the hemispherical assembly welding pieces 10 is formed by the arc notches of the 5 supporting seats 1, a plurality of groups of supporting adjusting bolts 2 are distributed on the arc surface at the arc notch, the supporting adjusting bolts 2 are distributed along the length direction of the arc surface, the axial directions of the supporting adjusting bolts are all directed to the spherical center position of the hemispherical assembly welding pieces 10, and the outer end nuts of the supporting adjusting bolts 2 are contacted with the hemispherical assembly welding pieces 10 so as to adjust the space pose state of the hemispherical assembly welding pieces 10 and adjust the position to a processing coordinate system.
In this embodiment, the supporting adjusting bolt 2 includes an adjusting screw 21 and a locking nut 22, a threaded hole is formed in the arcuate surface of the supporting seat 1, a screw rod of the adjusting screw 21 is screwed into the threaded hole in the arcuate surface, the locking nut 22 is threaded on the adjusting screw 21 to realize locking or loosening adjustment of the adjusting screw 21, when the supporting position of the adjusting screw 21 needs to be adjusted, the locking nut 22 needs to be loosened first, the adjusting screw 21 is rotated, so that the nut portion of the adjusting screw 21 pushes the hemispherical assembly welding member 10 to realize fine adjustment, and after the position of the hemispherical assembly welding member 10 is adjusted in place, the adjusting screw 21 is locked and fixed again through the locking nut 22.
According to the scheme, the ring-shaped base 3 between the adjacent supporting bases 1 is provided with the hanging rings 5 for hanging the processing tool, and the hanging rings in the embodiment are 5. The inboard of rings 5 is provided with bar hole 6, and the length direction in bar hole 6 sets up along annular seat 3 radial direction, and bar hole 6 is used for the base to subtract heavy, rings 5 and bar hole 6 in this scheme evenly distributed around annular seat 3's center respectively.
In order to realize the fine adjustment of the hemispherical assembly welding pieces 10 in the horizontal direction, 2 groups of horizontal adjusting bolts are arranged at the upper end of each supporting seat 1 in parallel, horizontal screw holes 111 are formed at the upper end of each supporting plate 11 in the horizontal direction, the horizontal adjusting bolts penetrate through the horizontal screw holes 111 at the upper end of each supporting plate 11 to realize the adjustment of the hemispherical assembly welding pieces 10 in the horizontal direction, so that the fastening holes 112 are aligned, the holes and the fastening holes 112 on the pressing plates 101 are used for fixing the hemispherical assembly welding pieces through the bolts, the horizontal adjusting bolt adjusting principle is the same as that of the supporting adjusting bolts 2, the adjusting bolts comprise adjusting bolts and locking nuts, when the horizontal position of the hemispherical assembly welding pieces 10 is required to be fine-adjusted, the locking nuts are firstly loosened, when the horizontal position of the hemispherical assembly welding pieces 10 is adjusted to be in place, after the holes of the pressing plates 101 coincide with the fastening holes 112 below, the locking nuts are fastened, two horizontal screw holes 111 of each supporting plate 11 are arranged in parallel, and the adjustment is performed from different angles to prevent the adjustment position deflection.
The working principle of the processing tool of the scheme is as follows: the hemispherical assembly welding part 10 is placed on a processing tool, the inner spherical surface faces upwards, the base and the supporting adjusting bolt 2 play a supporting role on the hemispherical assembly welding part 10, the hemispherical position is finely adjusted by the supporting adjusting bolt 2 and the horizontal adjusting bolt to be adjusted to the position of a processing coordinate system, and the pressing plate 101 welded on the hemispherical equatorial plane 102 is fastened by the bolts, so that rough machining and finish machining can be further carried out by a machine tool.
The embodiment also provides a high-precision machining method of the titanium alloy hemispherical assembly welding piece, which adopts the machining sequence of inner spherical surface rough machining, outer spherical surface finish machining, outer spherical surface three-coordinate detection and inner spherical surface machining, and effectively ensures the overall dimensional precision.
The method comprises the following specific steps: step 1,5 pressing plates 101,5 pressing plates 101 are welded at positions corresponding to the outer edges of hemispherical equatorial planes 102 of the hemispherical assembly welding piece 10, and the positions of the pressing plates 101 correspond to the positions of the supporting seat 1 respectively;
Step 2, milling holes on two pressing plates 101, and taking the holes of the two pressing plates 101 as reference holes 103 to prepare for the comparison of a subsequent model and a real object, wherein the reference holes 103 are also references for the subsequent alignment of a coordinate system on a machine tool;
Step 3, performing three-dimensional laser scanning on the hemispherical assembly welding piece 10 to generate a solid, and determining a machining coordinate system and machining allowance of each part by comparing the solid with a machining model;
step 4, placing the hemispherical assembly welding part 10 on a processing tool, enabling an inner spherical surface to face upwards, supporting the hemispherical assembly welding part 10 by a base of the processing tool and a supporting adjusting bolt 2, fine adjusting the hemispherical position by the supporting adjusting bolt 2 and a horizontal adjusting bolt to a processing coordinate system position, fastening and connecting a pressing plate 101 welded on a hemispherical equatorial plane 102 with a supporting seat 1 by a bolt, and carrying out rough processing on the inner spherical surface by a numerical control gantry triaxial machine tool, wherein after the processing procedure is finished, the residual processing allowance of the inner spherical surface is 2 mm;
Step 5, turning over the hemispherical assembly welding piece 10, enabling the outer spherical surface to face upwards, adopting a numerical control gantry type triaxial machine tool to carry out outer spherical surface rough machining, and remaining 2mm machining allowance;
step6, semi-finishing the outer spherical surface on a numerical control gantry type five-axis machine tool, wherein the machining allowance is 0.5 mm;
Step 7, performing finish machining of an outer spherical surface on a numerical control gantry type five-axis machine tool until the outer spherical surface is machined to the required size of a drawing;
Step 8, checking all sizes of the outer spherical surface of the hemispherical assembly welding piece 10 on a three-coordinate measuring machine, measuring the radius and the spherical center position of the hemispherical assembly welding piece, and performing fine adjustment on a coordinate system according to an actual measurement result to ensure the accuracy of the final size and the uniformity of the wall thickness;
Step 9, placing the hemispherical assembly welding piece 10 on a processing tool, determining processing coordinates by the coordinate system adjusted in the root step 8, performing semi-finishing of an inner spherical surface on a numerical control gantry five-axis machine tool, and remaining a machining allowance of 0.5 mm;
step 10, carrying out finish machining of an inner spherical surface on a numerical control gantry type five-axis machine tool until the size required by a drawing is achieved;
and step 11, milling Ping Banqiu the equatorial plane 102, ensuring the flatness and roughness of the equatorial plane, and simultaneously processing and removing the welded pressing plate 101.
Specifically, in this embodiment, the hemispherical assembly weldment 10 is made of Ti62A titanium alloy.
Specifically, the tool used in the processing of the hemispherical assembly welding element 10 is an alloy tool, and the processing parameters in the step 7 and the step 10 are as follows: the spindle rotation speed is 1200r/min, the cutting speed is 1000mm/min, the cutting depth is 0.5mm, and the feeding amount is 0.2mm.
It should be noted that the processing method of the present solution can also be used for processing other same kind of assembly welding parts.
By adopting the processing tool and the processing method, the radius dimensional tolerance of the inner spherical surface and the outer spherical surface can reach +/-0.3 mm, the true sphericity can reach 0.2mm, and the roughness can reach 3.2Ra.
The present invention is not limited to the above-mentioned embodiments, but is intended to be limited to the following embodiments, and any modifications, equivalent changes and variations in the above-mentioned embodiments can be made by those skilled in the art without departing from the scope of the present invention.
Claims (6)
1. The high-precision machining method of the titanium alloy hemispherical assembly welding piece is characterized by comprising the following steps of:
the hemispherical assembly welding piece is obtained by firstly carrying out rough machining on the inner spherical surface of the hemispherical assembly welding piece, then carrying out rough machining and finish machining on the outer spherical surface of the hemispherical assembly welding piece in sequence, then detecting the size of the outer spherical surface through three coordinates, carrying out fine adjustment on a coordinate system according to a detection result, and finally carrying out finish machining on the inner spherical surface of the hemispherical assembly welding piece; the specific processing method comprises the following steps:
step one, welding pressing plates with the same number as the supporting seats on the outer edges of hemispherical equatorial planes of the hemispherical assembly welding parts, wherein the pressing plates are respectively in one-to-one correspondence with the supporting seats;
step two, milling a reference hole on the pressing plate;
thirdly, performing three-dimensional laser scanning on the hemispherical assembly welding piece to generate a solid, and determining a processing coordinate system and processing allowance of each part by comparing the solid with a processing model of the hemispherical assembly welding piece;
Fourthly, placing the hemispherical assembly welding piece on a processing tool, wherein the inner spherical surface of the hemispherical assembly welding piece faces upwards, adjusting the position of the hemispherical assembly welding piece to the position of a processing coordinate system by using a supporting adjusting bolt and a horizontal adjusting bolt, fastening a pressing plate welded on the hemispherical equatorial plane by using a bolt, performing rough processing on the inner spherical surface by using a numerical control gantry type triaxial machine tool, and after the processing procedure is finished, leaving 2mm of processing allowance on the inner spherical surface;
Turning over the hemispherical assembly welding piece, namely, turning up the outer spherical surface of the hemispherical assembly welding piece, and adopting a numerical control gantry type triaxial machine tool to carry out rough machining on the outer spherical surface, wherein the machining allowance of the outer spherical surface is 2 mm;
step six, semi-finishing of the outer spherical surface is carried out on a numerical control gantry type five-axis machine tool, and the machining allowance of the outer spherical surface is remained by 0.5 mm;
Step seven, performing finish machining of an outer spherical surface on a numerical control gantry type five-axis machine tool to a required size;
Step eight, checking the size of the outer sphere on three coordinates, measuring the radius and the sphere center position of the outer sphere, and performing fine adjustment on a coordinate system according to the actual measurement result;
Step nine, placing the hemispherical assembly welding piece on a processing tool, determining processing coordinates according to the coordinate system adjusted in the step seven, and performing semi-finishing of an inner spherical surface on a gantry type five-axis machine tool, wherein the residual processing allowance of the inner spherical surface is 0.5 mm;
step ten, carrying out finish machining of the inner spherical surface on a gantry five-axis machine tool to a required size;
step eleven, milling an equatorial plane, and simultaneously machining and removing a pressing plate welded by the hemispherical assembly welding piece;
the processing method adopts a high-precision machining tool for the titanium alloy hemispherical assembly welding piece, the machining tool comprises a base and a plurality of supporting seats, the supporting seats are arranged on the base and distributed around the center of the base, an arc notch is formed on one side of each supporting seat close to the center of the base, the arc notches of all the supporting seats form an accommodating space for accommodating the hemispherical assembly welding piece, a plurality of groups of supporting adjusting bolts are distributed on the arc surface at the arc notch, the supporting adjusting bolts are distributed along the length direction of the arc surface, and the outer ends of the supporting adjusting bolts are contacted with the hemispherical assembly welding piece so as to adjust the space pose state of the hemispherical assembly welding piece to the position of a machining coordinate system;
The support seat comprises a support plate, two base plates and two reinforcing plates, wherein the support plate is perpendicular to the upper end face of the annular seat, the base plates are arranged on two sides of the lower edge of the support plate and perpendicular to the lower edge of the support plate, screw holes are formed in the base plates and are used for being fixedly connected with the annular seat through bolts, and the reinforcing plates are vertically arranged and symmetrically arranged on two sides of the support plate; the supporting adjusting bolt comprises an adjusting screw rod and a locking nut, a threaded hole is formed in the arc-shaped surface, a screw rod of the adjusting screw rod is screwed into the threaded hole in the arc-shaped surface, and the locking nut is arranged on the adjusting screw rod in a penetrating mode so as to realize locking or loosening adjustment of the adjusting screw rod;
5 pressing plates are welded at corresponding positions of the outer edges of the hemispherical equatorial plane of the hemispherical assembly welding piece, holes are milled on the two pressing plates, the holes of the two pressing plates are used as reference holes, and fastening holes are formed in the upper end face of the supporting plate and are used for corresponding to the reference holes.
2. The method for high precision machining of a titanium alloy hemispherical assembly weldment according to claim 1, wherein the method comprises the steps of: the base comprises an annular seat and a center seat, wherein the annular seat is used for installing the supporting seat, and the center seat is arranged at the center of the annular seat and is used for supporting the bottom of the hemispherical assembly welding piece.
3. The high precision machining method of the titanium alloy hemispherical assembly weldment according to claim 2, which is characterized in that: the upper end face of the center seat is provided with a spherical groove.
4. The high precision machining method of the titanium alloy hemispherical assembly weldment according to claim 2, which is characterized in that: and a hanging ring for hanging the processing tool is arranged on the annular seat between the adjacent supporting seats.
5. The high precision machining method of the titanium alloy hemispherical assembly weldment according to claim 4, which is characterized in that: the inner side of the lifting ring is provided with a strip-shaped hole, and the length direction of the strip-shaped hole is along the radial direction of the annular seat.
6. The method for high-precision machining of the titanium alloy hemispherical assembly weldment according to claim 1, which is characterized in that: the processing parameters in the seventh step and the tenth step are as follows: the spindle rotation speed is 1200r/min, the cutting speed is 1000mm/min, the cutting depth is 0.5mm, and the feeding amount is 0.2mm.
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| CN112405044A (en) * | 2020-11-19 | 2021-02-26 | 首都航天机械有限公司 | Additional device of integral spinning type semi-spherical shell inner surface molding machine |
| CN113084560A (en) * | 2021-06-10 | 2021-07-09 | 四川航天长征装备制造有限公司 | Flexible supporting device for processing large thin-wall spherical part and reference alignment method |
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