CN115488585A - Method and device for manufacturing top first-wall graphite mounting plate - Google Patents
Method and device for manufacturing top first-wall graphite mounting plate Download PDFInfo
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- CN115488585A CN115488585A CN202211060436.0A CN202211060436A CN115488585A CN 115488585 A CN115488585 A CN 115488585A CN 202211060436 A CN202211060436 A CN 202211060436A CN 115488585 A CN115488585 A CN 115488585A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 92
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 92
- 239000010439 graphite Substances 0.000 title claims abstract description 92
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 31
- 238000003801 milling Methods 0.000 claims abstract description 111
- 238000005520 cutting process Methods 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 9
- 239000010959 steel Substances 0.000 claims abstract description 9
- 238000003754 machining Methods 0.000 claims description 38
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000009434 installation Methods 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 9
- 238000005096 rolling process Methods 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- 230000008439 repair process Effects 0.000 claims description 4
- 238000005242 forging Methods 0.000 claims description 3
- 238000005098 hot rolling Methods 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 230000035699 permeability Effects 0.000 abstract description 7
- 230000007774 longterm Effects 0.000 abstract description 4
- 230000004927 fusion Effects 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 13
- 238000010586 diagram Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 9
- 230000035882 stress Effects 0.000 description 9
- 239000000463 material Substances 0.000 description 3
- 239000012467 final product Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007730 finishing process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
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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
- B23C—MILLING
- B23C3/00—Milling particular work; Special milling operations; Machines therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C9/00—Details or accessories so far as specially adapted to milling machines or cutter
-
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/10—Nuclear fusion reactors
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Abstract
The application belongs to the technical field of manufacturing of magnetic confinement nuclear fusion devices, and particularly relates to a method and a device for manufacturing a top first-wall graphite mounting plate, which are used for ensuring the relative magnetic permeability, the profile tolerance and the long-term dimensional stability of parts; the method comprises the following steps: selecting a steel ingot raw material to roll a thick plate, cutting an arc blank with the shape similar to the outline of the first-wall graphite mounting plate on the top in the thick plate, clamping one annular end face of the arc blank in a milling machine, milling the other annular end face, and processing a plurality of threaded holes in the milled other annular end face; installing the other annular end face of the arc blank on a milling appearance clamping tool by utilizing a plurality of threaded holes, and milling the appearance outlines of the inner side and the outer side of the arc blank and the appearance outline of the annular end face; clamping the arc blanks assembled and locked with the milling shape clamping tool together to complete the processing of the bolt through holes on all the contour surfaces; and finely milling the arc blank to a final target contour to obtain the top first-wall graphite mounting plate.
Description
Technical Field
The application belongs to the technical field of manufacturing of magnetic confinement nuclear fusion devices, and particularly relates to a method and a device for manufacturing a top first-wall graphite mounting plate.
Background
In a tokamak device, the wall material facing the plasma is generally referred to as the first wall. In the new generation of tokamak device, graphite is adopted as a wall material facing to plasma at the present stage, and the graphite is supported and fixed by a metal mounting plate made of 316L material, so the shape and the precision of the graphite mounting plate directly determine the spatial distribution position and the positioning precision of the graphite.
The first wall graphite mounting plate at the top is to be installed at the top of the inner cavity of the annular vacuum chamber with the D-shaped section, and the 360-degree annular space at the top of the whole vacuum chamber is paved around the central axis of the device. As shown in fig. 1 and 2, the shape of the outer side contour of the first wall graphite mounting plate 1 on the top of the new generation tokamak device is composed of an arc and a plane, the inner side contour of the new generation tokamak device is composed of a plurality of space planes, each small plane is provided with two bolt through holes 104 for mounting graphite, the arc length of the first wall graphite mounting plate 1 on the whole top is more than 1 meter, two annular end surfaces 101 and 102 are cut by an included angle plane passing through the central axis of the tokamak device, and the length and the width of the annular maximum chord 103 reach 140mm. In order to ensure the installation accuracy of graphite, the profile of the entire inner profile consisting of a plurality of planes must be less than 0.2mm and must be maintained without deformation for a long time. In addition, since the top first-wall graphite mounting plate 1 is located in the strong magnetic field of the tokamak device, the relative permeability of the finished product is required to be less than 1.04.
Because the top first-wall graphite mounting plate 1 has the characteristics of complex space shape, high requirement on dimensional accuracy, strict magnetic conductivity and the like, the top first-wall graphite mounting plate belongs to first-time manufacture in China, and no mature processing experience can be used for reference.
Disclosure of Invention
The application aims to provide a method and a device for manufacturing a top first-wall graphite mounting plate, and the method and the device solve the problem of how to manufacture the top first-wall graphite mounting plate with complex spatial shape and high requirement on dimensional accuracy.
The technical scheme for realizing the purpose of the application is as follows:
a first aspect of an embodiment of the present application provides a method for manufacturing a top first-wall graphite mounting plate, the method comprising:
selecting a steel ingot raw material to roll a thick plate, wherein the thickness of the thick plate is greater than the maximum circumferential chord length of the top first-wall graphite mounting plate;
cutting an arc blank with the shape similar to the outline of the top first-wall graphite mounting plate into the thick plate, wherein the circumferential chord length of the arc blank is equal to the thickness of the thick plate;
clamping one annular end face of the circular arc blank in a milling machine, milling the other annular end face, and machining a plurality of threaded holes in the center line position of the wall thickness of the inner circular arc profile and the outer circular arc profile on the milled other annular end face;
installing the other annular end face of the arc blank on a milling outer shape clamping tool by utilizing the threaded holes, and milling the outer side outer shape outline and the outer side outer shape outline of the arc blank and the outer shape outline of the annular end face which is not clamped;
clamping the arc blanks assembled and locked with the milling appearance clamping tool on a rotating platform of a numerical control horizontal machining center together to complete the machining of the bolt through holes on all contour surfaces;
and carrying out finish milling on the arc blank to a final target contour by using the milling shape clamping tool and the annular end face milling tool to obtain the top first-wall graphite mounting plate.
Optionally, the selecting a steel ingot raw material to roll a thick plate further includes:
and carrying out solution heat treatment on the thick plate, preserving the heat at 1050-1100 ℃ for 120 minutes, and discharging and cooling the thick plate by water after the heat preservation time is reached.
Optionally, the selecting a steel ingot raw material to roll a thick plate specifically includes:
and selecting a steel ingot raw material, and rolling a thick plate in a slab forging and hot rolling mode, wherein the thickness of the rolled thick plate is 10 mm longer than the maximum circumferential chord length of the top first-wall graphite mounting plate.
Optionally, the use of a circular arc blank cut out in the thick plate and having a shape similar to the contour of the top first-wall graphite mounting plate further includes:
and (3) carrying out heat treatment on the arc blank to eliminate stress, keeping the temperature for 4-8 hours at 410-425 ℃, and discharging the arc blank from the furnace for air cooling after the temperature is kept for the time.
Optionally, the milling of the outer contour of the inner side and the outer contour of the arc blank and the contour of the non-clamped annular end face further includes:
and (3) carrying out heat treatment on the arc blank to eliminate stress, keeping the temperature for 4-6 hours at 410-425 ℃, and discharging the arc blank from the furnace for air cooling after the temperature is kept for the time.
Optionally, the cutting of the circular arc blank in the thick plate, which is similar to the contour shape of the top first-wall graphite mounting plate, specifically includes:
and cutting the arc-shaped blank in the thick plate by using a linear cutting machining mode, wherein the single-side machining allowance of the outline of the arc-shaped blank is kept between 3mm and 5mm.
Optionally, the utilization mill appearance clamping frock and hoop face milling frock, right the circular arc blank finish milling arrives final target profile, obtains the first wall graphite mounting panel in top, specifically includes:
assembling the arc-shaped blank and the milling appearance clamping tool, and circularly polishing the appearance contour surfaces of the inner side and the outer side of the arc-shaped blank by adopting an integral coating rod milling cutter through one feed;
and assembling the arc blank and the annular end face milling tool, processing the annular end face with a threaded hole to a final target contour by an upper vertical numerical control processing center or a numerical control gantry milling machine, performing clamping repair on the processed arc blank, and removing burrs and fins to obtain the top first-wall graphite mounting plate.
A second aspect of the embodiments of the present application provides an apparatus for manufacturing a top first-wall graphite mounting plate, applied to any one of the methods for manufacturing a top first-wall graphite mounting plate provided in the first aspect of the embodiments of the present application; the apparatus, comprising: milling an appearance clamping tool and an annular end face milling tool;
the platform plane of the milling shape clamping tool is attached to the annular end face of the threaded hole of the arc-shaped blank, and a through hole which is superposed with the position of the bolt hole of the arc-shaped blank is formed in the platform plane and used for assembling the arc-shaped blank;
the outside of hoop face milling frock is provided with the work piece installation locating surface, the overall dimension of work piece installation locating surface with the theoretical dimension of the inboard plane profile of the first wall graphite mounting panel in top matches the corresponding position of each facet on the work piece installation locating surface is pressed work piece locking screw hole has been seted up to the hole site of the theoretical model of the first wall graphite mounting panel in top and has been used for the first wall graphite mounting panel in top with the locking of hoop face milling frock.
Optionally, a positioning pin hole is formed in the milling shape clamping tool, and the circular arc blank is accurately positioned by installing a cylindrical pin in the positioning pin hole.
Alternatively to this, the first and second parts may,
a first coordinate system positioning hole is formed in the platform plane of the milling shape clamping tool, and a first clamping alignment face is arranged on one side, away from the arc blank, of the milling shape clamping tool and used for rapidly determining a feed coordinate system and a direction during machining;
and a second coordinate system positioning hole and a second clamping alignment surface are formed in the plane of the annular end face milling tool and used for rapidly aligning the annular end face milling tool and determining a machining coordinate system during machining.
The beneficial technical effect of this application lies in:
according to the embodiment of the application, the blank with the outline of the product is manufactured by rolling a thick plate and then cutting the thick plate in a linear mode, so that the problems of serious internal stress and over-standard magnetic conductivity caused by thin plate profiling and welding are avoided, and the deformation of the product in the subsequent processing process is reduced; the rough milling and finish milling procedures of the inner and outer side profiles can be finished on a three-axis numerical control machine tool by arranging a threaded hole at one end of a workpiece and fixing the threaded hole with a special milling tool, and the machining efficiency and the machining precision are higher; the heat treatment process is reasonably arranged among the processes, so that the internal stress of the product in the processing process is fully eliminated, and the long-term dimensional stability of the final product is improved. The method has the advantages that the operability is high, the processing efficiency is high, the profile degree of the top first-wall graphite mounting plate processed according to the method can be stably kept within 0.2mm for a long time, and the magnetic permeability of all areas of a finished product is smaller than 1.04.
Drawings
FIG. 1 is a schematic diagram of a top first wall graphite mounting plate of a tokamak apparatus in an embodiment of the present application;
FIG. 2 is a schematic diagram of a top first wall graphite mounting plate of another embodiment of the tokamak apparatus of the present application;
FIG. 3 is a schematic flow chart diagram of a method for manufacturing a top first-wall graphite mounting plate according to an embodiment of the present application;
FIG. 4 is a schematic diagram illustrating the cutting of a circular arc blank according to an embodiment of the present application;
FIG. 5 is a schematic view illustrating the machining of a threaded hole according to an embodiment of the present application;
FIG. 6 is a schematic structural diagram of a milling profile clamping tool in an embodiment of the present application;
FIG. 7 is a schematic structural diagram of an annular face milling fixture in an embodiment of the present application;
fig. 8 is an assembly schematic diagram of a milling shape clamping tool and an arc blank in the embodiment of the present application;
fig. 9 is an assembly schematic diagram of an annular face milling tool and an arc blank in the embodiment of the present application.
In the figure:
1-a top first wall graphite mounting plate; 101. 102-annular two end faces; 103-circumferential maximum chord;
104-bolt through hole;
2-thick plate; 21-arc blank; 22-a threaded hole;
3-milling an appearance clamping tool; 31-a platform plane; 32-a via hole; 33-positioning pin holes; 34-cylindrical pin; 35-first coordinate system locating holes; 36-first clamping and locating the front surface;
4-annular end face milling tooling; 41-workpiece mounting and positioning surface; 42-workpiece locking threaded hole; 43-second coordinate system locating holes; 44-second chuck to face.
Detailed Description
In order to make the technical solutions in the embodiments of the present application more comprehensible to those skilled in the art, the following description will be made in detail and completely with reference to the accompanying drawings in the embodiments of the present application. It should be apparent that the embodiments described below are only some of the embodiments of the present application, and not all of them. All other embodiments that can be derived by a person skilled in the art from the embodiments described herein without inventive step are within the scope of the present application.
For ease of understanding, the specific structure of the top first-wall graphite mounting plate to which the embodiments of the present application relate will be first described below.
As shown in fig. 1, the outline of the outer side of the finished product of the top first-wall graphite mounting plate 1 of the tokamak device, which is mounted in the inner cavity of the vacuum chamber, is composed of an arc and a plane, the inner side of the finished product is in a space outline shape formed by all small planes, each small plane is provided with two bolt through holes 104 for mounting and fixing graphite, and the wall thickness of the top first-wall graphite mounting plate 1 is different from 15mm to 25 mm.
Defining OZ as the central axis of the Tokamak device, and defining the direction of one rotation around the central axis of OZ as a ring direction. In the Tokamak device, a plurality of top first-wall graphite mounting plates 1 are annularly paved on the top of an annular vacuum chamber with an OZ axis as a center, wherein the D-shaped section of the Tokamak device is a section of the annular vacuum chamber; as shown in fig. 1, the circumferential end faces 101 and 102 of the top first-wall graphite mounting plate 1 are defined as circumferential included angle faces, and the circumferential end faces 101 and 102 are cut by two included angle faces passing through the central axis of the OZ, so that the circumferential chord length value closer to the OZ axis is smaller, and the circumferential chord length value farther from the OZ axis is larger, and the circumferential chord length at the outermost side is defined as a circumferential maximum chord 103, and the value of the circumferential maximum chord 103 is about 140mm. Because the top first-wall graphite mounting plate 1 has the characteristics of complex space shape, high requirement on dimensional accuracy, strict magnetic conductivity and the like, the top first-wall graphite mounting plate belongs to first-time manufacture in China, and no mature processing experience can be used for reference.
The embodiment of the application provides a method and a device for manufacturing a top first-wall graphite mounting plate, so that the relative permeability, the profile degree and the long-term dimensional stability of parts are guaranteed.
Based on the above, in order to clearly and specifically explain the above advantages of the present application, the following description of the embodiments of the present application will be made with reference to the accompanying drawings.
Referring to fig. 3, a schematic flow chart of a method for manufacturing a top first-wall graphite mounting plate according to an embodiment of the present disclosure is shown.
The embodiment of the application provides a method for manufacturing a top first-wall graphite mounting plate, which comprises the following steps:
s101: and selecting a steel ingot raw material to roll a thick plate 2.
In the present embodiment, the thickness of the slab 2 is greater than the maximum circumferential chord length of the top first-wall graphite mounting plate 1. As an example, the thickness of the rolled plank 2 is 10 millimeters longer than the maximum circumferential chord 103 of the top first wall graphite mounting plate 1.
In practical applications, the slab 2 can be rolled by forging a slab and hot rolling, which are not listed here, from a steel ingot raw material with a qualified composition.
In one example, in order to ensure the relative permeability of the top first-wall graphite mounting plate 1, after step S101, the method may further include:
and carrying out solution heat treatment on the thick plate 2, preserving the heat at 1050-1100 ℃ for 120 minutes, and discharging and cooling the thick plate after the heat preservation time is reached.
The relative permeability of the thick plate 2 rolled according to the step can be kept below 1.04.
S102: an arc blank 21 similar to the outline shape of the top first-wall graphite mounting plate 1 is cut out of the thick plate 2.
In the present embodiment, as shown in fig. 4, the circumferential chord length of the circular arc blank 21 is equal to the thickness of the thick plate 2. It will be appreciated that in practice, a plurality of circular arcs of blank 21 may be cut into a slab 2, as shown in fig. 4. For the convenience of subsequent processing, compared with the top first-wall graphite mounting plate 1, the single-edge processing allowance of the contour of the circular arc blank 21 cut in the step can be left at 3 mm-5 mm. In practical application, the arc-shaped blank can be cut out of the thick plate by using a linear cutting machining mode.
In some possible implementation manners of the embodiment of the present application, after step S102, the method may further include:
and (3) performing heat treatment on the arc blank 21 to eliminate stress, preserving the heat for 4 to 8 hours at the temperature of between 410 and 425 ℃, and discharging the arc blank out of the furnace for air cooling after the heat preservation time is reached. The function of this step is to substantially eliminate the internal stress generated inside the slab 2 during the rolling process and to improve the dimensional stability of the circular arc blank 21.
S103: clamping one annular end face of the circular arc blank 21 in a milling machine, milling the other annular end face, and processing a plurality of threaded holes 22 at the central line position of the wall thickness of the circular arc outline on the inner side and the outer side of the milled other annular end face.
In the embodiment of the present application, as shown in fig. 5, a plurality of threaded holes 22 may be machined at the centerline position of the wall thickness of the inner and outer circular arc profiles on the milled circumferential end surface, and the threaded holes 22 machined in this step are used for end surface mounting and locking in the subsequent rough milling and finish milling processes. The distance between the two threaded holes can be 25 mm-50 mm.
In practical application, one annular end face of the arc blank 21 can be clamped on a workbench of a vertical numerical control machining center or a numerical control gantry milling machine, and the other annular end face is milled and polished.
S104: installing the other annular end face of the arc blank 21 on the milling shape clamping tool 3 by utilizing the threaded holes 22, and milling the inner and outer side shape profiles of the arc blank 21 and the shape profile of the unclamped annular end face;
in order to roughly mill the outline, in practical application, the outline of the inner side and the outline of the outer side of the arc blank 21 and the outline of the annular end face which is not clamped can be clamped and milled at one time on a vertical numerical control machining center or a numerical control gantry milling machine. The specific structure and assembly method of the milling shape clamping tool 3 will be described in detail later, and will not be described herein again.
As an example, the outline of the arc blank 21 after rough milling may have a subsequent finish milling single-edge machining allowance of 0.6mm to 0.8mm for each face compared to the top first-wall graphite mounting plate 1, except for the threaded circumferential end face and the hole.
In some possible implementations of the embodiment of the present application, in order to relieve the thermal stress, the step S104 may further include: and (3) carrying out heat treatment on the arc blank 21 to relieve stress, keeping the temperature for 4-6 hours at 410-425 ℃, and discharging and air cooling after the temperature is kept for the time.
S105: clamping the arc blank 21 assembled and locked with the milling shape clamping tool 3 on a rotating platform of a numerical control horizontal machining center together to complete the machining of the bolt through holes 104 on all contour surfaces;
in the embodiment of the application, the arc blank 21 after the step S104 and the milling appearance clamping tool 3 are assembled and locked in a manner of being fixed by the threaded hole 22 and clamped on the rotating platform of the numerical control horizontal machining center together, the rotating platform used in the step and the machining center host can realize numerical control linkage, and the bolt through holes 104 on all the contour surfaces are machined by generating a hole machining program of the top first-wall graphite mounting plate 1 according to a theoretical model through UG or other numerical control machining three-dimensional software. The bolt through hole 104 is machined before finish machining of the inner and outer contour surfaces, deformation of the contour surfaces caused by machining of the bolt through hole 104 after finish milling of the inner and outer contour surfaces is avoided, and improvement of final contour degree of a finished product is facilitated.
S106: and (3) finish milling the arc blank 21 to a final target contour by using a milling appearance clamping tool 3 and a circumferential end face milling tool 4 to obtain the top first-wall graphite mounting plate 1.
In some possible implementation manners of the embodiment of the present application, step S106 may specifically include:
assembling the arc blank 21 and the milling appearance clamping tool 3, and circularly polishing the appearance contour surfaces of the inner side and the outer side of the arc blank 21 by adopting an integral coating rod milling cutter in one feed;
assembling the arc blank 21 and the annular end face milling tool 4, machining the annular end face with the threaded hole 22 to a final target contour by an upper vertical numerical control machining center or a numerical control gantry milling machine, performing clamping repair on the machined arc blank 21, and removing burrs to obtain the top first-wall graphite mounting plate 1.
In the embodiment of the present application, the arc blank 21 after the step S105 is completed may be firstly removed from the horizontal machining center together with the assembly state maintained by the milling shape clamping tool 3, and the vertical machining center or the numerical control planer type milling machine is again used to finish mill the shape profile to the theoretical target size, including the shape of the unclamped annular end face. In the final finishing process of the inner and outer contour surfaces, the outer contour surfaces of the inner and outer sides of the arc blank 21 are circularly finished by adopting an integral coating rod milling cutter through one feed, so that better shape precision and surface roughness of a finished product can be obtained. After the machining of the step, the arc blank 21 is machined to the final theoretical size except for the unprocessed thread clamping end face.
Then, the arc blank 21 and the annular end face milling tool 4 are assembled, the annular end face with the threaded hole 22 is machined to the final target contour by an upper vertical numerical control machining center or a numerical control gantry milling machine, and then clamping repair is carried out to remove flash and burrs. After this step of machining, the circular arc blank 21 is machined to the final finished dimensions of the top first-wall graphite mounting plate 1. In practical application, the precision machining of the annular end face can be realized by generating a profiling machining program of the outline end face through three-dimensional machining software such as UG.
According to the embodiment of the application, the blank with the outline of the product is manufactured by rolling a thick plate and then cutting the thick plate in a linear mode, so that the problems of serious internal stress and excessive magnetic conductivity caused by thin plate profiling and welding are avoided, and the deformation of the product in the subsequent processing process is reduced; the rough milling and finish milling processes of the inner and outer side profiles can be finished on a three-axis numerical control machine tool in a mode of arranging a threaded hole at one end of a workpiece and fixing the threaded hole with a special milling tool, and the machining efficiency and the machining precision are higher; the heat treatment process is reasonably arranged among the processes, so that the internal stress of the product in the processing process is fully eliminated, and the long-term dimensional stability of the final product is improved. The method has the advantages that the operability is high, the processing efficiency is high, the profile degree of the top first-wall graphite mounting plate processed according to the method can be stably kept within 0.2mm for a long time, and the magnetic permeability of all areas of a finished product is smaller than 1.04.
Based on the method for manufacturing the top first-wall graphite mounting plate provided by the above embodiment, the embodiment of the application also provides a device for manufacturing the top first-wall graphite mounting plate, and the method for manufacturing the top first-wall graphite mounting plate is applied to any one of the above embodiments.
Referring to fig. 6 and 7, the schematic diagrams of an apparatus for manufacturing a top first-wall graphite mounting plate according to an embodiment of the present disclosure are shown.
The device for manufacturing the top first-wall graphite mounting plate comprises: a milling appearance clamping tool 3 and a circumferential end face milling tool 4;
a platform plane 31 of the milling shape clamping tool 3 is attached to the circumferential end face of the arc blank 21 with the threaded hole 22, and a through hole 32 which is superposed with the bolt hole 22 of the arc blank 21 is formed in the platform plane 31 and used for assembling the arc blank 21;
the outside of the annular end face milling tool 4 is provided with a workpiece mounting and positioning surface 41, the contour dimension of the workpiece mounting and positioning surface 41 is matched with the theoretical dimension of the inner side plane contour of the top first-wall graphite mounting plate 1, and workpiece locking threaded holes 42 are formed in the corresponding positions of all facets on the workpiece mounting and positioning surface 41 according to the hole positions of the theoretical model of the top first-wall graphite mounting plate 1 and used for locking the top first-wall graphite mounting plate 1 and the annular end face milling tool 4.
It can be understood that the circumferential end face of the circular arc blank 21 with the thread is attached to the platform plane 31 of the milling shape clamping tool 3, the threaded hole 22 of the circular arc blank 21 is overlapped with the through hole 32 of the milling shape clamping tool 3, and the circular arc blank 21 is assembled and locked in a mode of tightening the end face of the workpiece through the bolt, as shown in fig. 8.
In the embodiment of the present application, an installation positioning surface 41 is disposed on the outer side of the annular end face milling tool 4, the contour dimension of this installation positioning surface 41 is processed according to the theoretical dimension of the inner side plane contour of the top first-wall graphite mounting plate 1, and a workpiece locking threaded hole 42 is formed in the corresponding position of each facet on the installation positioning surface 41 according to the hole position of the theoretical model of the top first-wall graphite mounting plate 1 for locking the workpiece and the tool. During assembly, the inner plane profile of the circular arc blank 21 is uniformly and tightly attached to the installation positioning surface 41 of the annular end face milling tool 4, and is locked by bolts, as shown in fig. 9.
In some possible implementation manners of the embodiment of the application, the milling shape clamping tool 3 is provided with a positioning pin hole 33, and the circular arc blank 21 is accurately positioned by installing a cylindrical pin 34 in the positioning pin hole 33.
As an example, the positioning pin holes 33 are 3 hole positions, two positioning pin holes 33 are positioned at the inner contour position, the third positioning pin hole 33 is positioned at the plane corner of the outer circular arc, and the circular arc blank 21 is accurately positioned through the cylindrical pin 34. In practice, workpieces with different machining allowances can be positioned by changing the outer diameter of the cylindrical pin 25.
In some possible implementation manners of the embodiment of the application, a first coordinate system positioning hole 35 is formed in the platform plane 31 of the milling shape clamping tool 3, and a first clamping front face 36 is formed on one side, away from the arc blank 21, of the milling shape clamping tool 3, and is used for quickly determining a feed coordinate system and a direction during machining;
and a second coordinate system positioning hole 43 and a second clamping alignment surface 44 are formed in the plane of the annular end face milling tool 4 and used for rapidly aligning the annular end face milling tool 4 and determining a processing coordinate system during processing.
In practical application, the relative position relationship between the first coordinate system positioning hole 35 and the first clamping alignment surface 36, the relative position relationship between the through hole 32 and the positioning pin hole 33 are determined by UG three-dimensional software simulation of the theoretical shape and the theoretical position of the top first-wall graphite mounting plate 1, and the machining feed coordinate system and the machining direction can be rapidly determined by aligning and milling the contour clamping tool 3 during machining. The circular arc blank 21 can be quickly installed, positioned and aligned in a mode of assembling the circular arc blank 21 with the milling appearance clamping tool 3, the phenomenon that the machining precision and the machining efficiency are reduced due to multiple tool receiving caused by replacement of a clamping pressing plate in the milling and feeding process is avoided, and the machining precision and the machining efficiency of the inner and outer side profiles and the hole machining of the circular arc blank 21 are guaranteed.
The present application has been described in detail with reference to the drawings and examples, but the present application is not limited to the above examples, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application. The prior art can be used for all the matters not described in detail in this application.
Claims (10)
1. A method for manufacturing a top first wall graphite mounting plate, the method comprising:
selecting a steel ingot raw material to roll a thick plate, wherein the thickness of the thick plate is greater than the maximum circumferential chord length of the top first-wall graphite mounting plate;
cutting an arc blank with the shape similar to the outline of the top first-wall graphite mounting plate into the thick plate, wherein the circumferential chord length of the arc blank is equal to the thickness of the thick plate;
clamping one annular end face of the arc blank in a milling machine, milling the other annular end face, and processing a plurality of threaded holes at the central line position of the wall thickness of the inner and outer arc profiles on the milled other annular end face;
installing the other annular end face of the arc blank on a milling appearance clamping tool by utilizing the threaded holes, and milling the appearance outlines of the inner side and the outer side of the arc blank and the appearance outline of the unclamped annular end face;
clamping the arc blanks assembled and locked with the milling appearance clamping tool on a rotating platform of a numerical control horizontal machining center together to complete the machining of the bolt through holes on all contour surfaces;
and carrying out finish milling on the arc blank to a final target contour by using the milling shape clamping tool and the annular end face milling tool to obtain the top first-wall graphite mounting plate.
2. A method for manufacturing a top first wall graphite mounting plate according to claim 1, wherein said selecting a bloom stock to roll a slab, thereafter further comprises:
and carrying out solution heat treatment on the thick plate, preserving the heat at 1050-1100 ℃ for 120 minutes, and discharging and cooling the thick plate by water after the heat preservation time is reached.
3. Method for manufacturing a top first wall graphite mounting plate according to claim 1, characterized in that said selection of ingot raw material rolling slabs comprises in particular:
and selecting a steel ingot raw material, and rolling a thick plate in a slab forging and hot rolling mode, wherein the thickness of the rolled thick plate is 10 mm larger than the maximum circumferential chord length of the graphite mounting plate on the first wall at the top.
4. The method for manufacturing a top first-wall graphite mounting plate according to claim 1, wherein said using a circular arc blank cut out in said slab in a shape similar to the contour shape of said top first-wall graphite mounting plate, further comprises:
and (3) carrying out heat treatment on the arc blank to eliminate stress, keeping the temperature for 4-8 hours at 410-425 ℃, and discharging the arc blank from the furnace for air cooling after the temperature is kept for the time.
5. The method for manufacturing a top first-wall graphite mounting plate according to claim 1, wherein the milling of the contour of the inside and outside of the circular arc blank and the contour of an unclamped circumferential end face further comprises:
and (3) carrying out heat treatment on the arc blank to eliminate stress, keeping the temperature for 4-6 hours at 410-425 ℃, and discharging the arc blank from the furnace for air cooling after the temperature is kept for the time.
6. The method for manufacturing a top first-wall graphite mounting plate according to claim 1, wherein said using a circular-arc blank cut out in the thick plate in a shape similar to the contour shape of the top first-wall graphite mounting plate specifically comprises:
and cutting the arc-shaped blank in the thick plate by using a linear cutting machining mode, wherein the single-side machining allowance of the outline of the arc-shaped blank is kept between 3mm and 5mm.
7. The method according to claim 1, wherein the step of using the milling contour clamping tool and the circumferential end face milling tool to finish mill the circular arc blank to a final target contour to obtain the top first-wall graphite mounting plate specifically comprises:
assembling the arc-shaped blank and the milling appearance clamping tool, and circularly polishing the appearance contour surfaces of the inner side and the outer side of the arc-shaped blank by adopting an integral coating rod milling cutter through one feed;
and assembling the arc blank and the annular end face milling tool, processing the annular end face of the threaded hole to a final target contour by using an upper vertical numerical control processing center or a numerical control gantry milling machine, performing clamping repair on the processed arc blank, and removing burrs and fins to obtain the top first-wall graphite mounting plate.
8. An apparatus for manufacturing a top first-wall graphite mounting plate, characterized by being applied to the method for manufacturing a top first-wall graphite mounting plate according to any one of claims 1 to 7; the apparatus, comprising: milling an appearance clamping tool and an annular end face milling tool;
the platform plane of the milling shape clamping tool is attached to the annular end face of the threaded hole of the arc-shaped blank, and a through hole which is superposed with the position of the bolt hole of the arc-shaped blank is formed in the platform plane and used for assembling the arc-shaped blank;
the outside of hoop face milling frock is provided with the work piece installation locating surface, the overall dimension of work piece installation locating surface with the theoretical dimension of the inboard plane profile of the first wall graphite mounting panel in top matches the corresponding position of each facet on the work piece installation locating surface is pressed work piece locking screw hole has been seted up to the hole site of the theoretical model of the first wall graphite mounting panel in top and has been used for the first wall graphite mounting panel in top with the locking of hoop face milling frock.
9. The apparatus of claim 8, wherein the milling fixture is provided with a positioning pin hole, and the circular arc blank is accurately positioned by installing a cylindrical pin in the positioning pin hole.
10. The apparatus for manufacturing a top first wall graphite mounting plate according to claim 8,
a first coordinate system positioning hole is formed in the platform plane of the milling shape clamping tool, and a first clamping alignment face is arranged on one side, away from the arc blank, of the milling shape clamping tool and used for rapidly determining a feed coordinate system and a direction during machining;
and a second coordinate system positioning hole and a second clamping alignment surface are formed in the plane of the annular end face milling tool and used for rapidly aligning the annular end face milling tool and determining a machining coordinate system during machining.
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| CN202211060436.0A CN115488585A (en) | 2022-08-31 | 2022-08-31 | Method and device for manufacturing top first-wall graphite mounting plate |
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| CN202211060436.0A CN115488585A (en) | 2022-08-31 | 2022-08-31 | Method and device for manufacturing top first-wall graphite mounting plate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116393940A (en) * | 2023-06-05 | 2023-07-07 | 成都迈特航空制造有限公司 | Cam valve machining and manufacturing method |
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| CN108857301A (en) * | 2018-07-26 | 2018-11-23 | 深圳市东方碳素实业有限公司 | The manufacturing method of graphite jig |
| CN113102955A (en) * | 2021-04-23 | 2021-07-13 | 襄阳天宇机械有限公司 | Tooth-shaped processing technology of metal sealing washer |
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| US5033559A (en) * | 1990-05-11 | 1991-07-23 | Dresser Industries, Inc. | Drill bit with faceted profile |
| US20080247899A1 (en) * | 2007-04-03 | 2008-10-09 | Cho H Sam | Contoured PCD and PCBN for twist drill tips and end mills and methods of forming the same |
| CN103949854A (en) * | 2014-04-23 | 2014-07-30 | 马鞍山马钢表面工程技术有限公司 | Subsection machining method for large-diameter arc toothed plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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