CN112589148A - Boring machining method for high-precision thin-wall titanium alloy frame - Google Patents
Boring machining method for high-precision thin-wall titanium alloy frame Download PDFInfo
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- CN112589148A CN112589148A CN202011475197.6A CN202011475197A CN112589148A CN 112589148 A CN112589148 A CN 112589148A CN 202011475197 A CN202011475197 A CN 202011475197A CN 112589148 A CN112589148 A CN 112589148A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B35/00—Methods for boring or drilling, or for working essentially requiring the use of boring or drilling machines; Use of auxiliary equipment in connection with such methods
-
- 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
- B23Q3/062—Work-clamping means adapted for holding workpieces having a special form or being made from a special material
- B23Q3/065—Work-clamping means adapted for holding workpieces having a special form or being made from a special material for holding workpieces being specially deformable, e.g. made from thin-walled or elastic material
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drilling And Boring (AREA)
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Abstract
The invention discloses a boring processing method of a high-precision thin-wall titanium alloy frame, which comprises the following steps: (1) grinding the bottom surface and each side surface of the frame; (2) placing the bottom surface on a workbench, installing a dial indicator on a spindle of a horizontal boring machine, aligning a frame, and uniformly pressing a boss in the frame by using a pressing plate; (3) placing a square angle square on the top surface of the frame to calibrate the rotation precision of the horizontal boring machine; (4) c, D processing test blocks are respectively arranged on the outer side surfaces of the C, D holes of the frame, and C, D processing test block inner holes are processed; (5) installing a dial indicator on a spindle of the horizontal boring machine, and eliminating the error between the spindle of the horizontal boring machine and the center of a workbench; (6) removing C, D the processing test block, and processing C, D holes of the frame; (7) thereafter A, B holes were machined. The invention can effectively control and reduce the processing deformation when processing the high-precision thin-wall titanium alloy frame, ensure the form and position tolerance of a shaft system and improve the surface processing quality of the thin-wall titanium alloy frame in boring processing.
Description
Technical Field
The invention relates to a boring processing method of a high-precision thin-wall titanium alloy frame, and belongs to the technical field of product forming and processing.
Background
Titanium and titanium alloy materials are increasingly widely applied in the fields of aviation, aerospace, ships, weapons and the like due to the characteristics of small density, high specific strength, excellent corrosion resistance and the like.
However, in general, thin-walled titanium alloy parts are very easy to deform during machining, and in order to ensure machining quality and surface accuracy, extra allowance is often required, and the machining process needs to be repeated for many times, so that the machining period is long. And because of the limitation of the rotation precision of the machine tool, the high-precision form and position tolerance of the frame shafting is difficult to guarantee.
Disclosure of Invention
The invention provides a boring processing method of a high-precision thin-wall titanium alloy frame, which can effectively control and reduce processing deformation when the high-precision thin-wall titanium alloy frame is processed, ensure the form and position tolerance of a shaft system and improve the surface processing quality of the thin-wall titanium alloy frame in boring processing.
In order to solve the technical problems, the invention adopts the following technical scheme:
a boring processing method of a high-precision thin-wall titanium alloy frame is a square frame, the top surface and the bottom surface of the frame are open, A, B through holes are formed in the middle lower parts of the front side surface and the rear side surface of the frame, C, D threaded through holes are formed in the middle upper parts of the left side surface and the right side surface of the frame, the central axes of A, B holes are overlapped, the central axes of A, B holes are perpendicular to and intersected with the vertical central line of the frame, the central axes of C, D holes are overlapped, and the central axes of C, D holes are perpendicular to and intersected with the vertical central line of the frame:
(1) grinding the bottom surface and the side surfaces of the thin-wall titanium alloy frame to ensure the flatness of the bottom surface and the side surfaces of the frame, the verticality between the bottom surface and each side surface and the verticality between the adjacent side surfaces, and taking the bottom surface as a positioning reference;
(2) placing the bottom surface of the frame on the working table surface of a horizontal boring machine, installing a dial indicator on a spindle of the horizontal boring machine, moving the frame along a Z-direction coordinate of the horizontal boring machine to check the appearance of the frame, and finely adjusting the frame to enable the reading of the dial indicator to be less than 0.02 mm; rotating the workbench by 90 degrees, wherein the detection method is the same as the above, so that the reading of the dial indicator is smaller than 0.02mm, the central axis of an A, B hole of the frame is intersected with the rotation center of the workbench, and the central axis of a C, D hole of the frame is intersected with the rotation center of the workbench, thereby aligning the frame, and then uniformly pressing a boss in the frame by a pressing plate;
(3) placing a square angle ruler at the top surface of the frame to calibrate the rotation precision of the horizontal boring machine, specifically, installing a marking rod provided with a micrometer on a tail seat of the horizontal boring machine, enabling a pointer of the micrometer to be in contact with the square angle ruler, rotating a working table until the maximum reading difference value of the micrometer is less than 0.002mm, and then dispensing glue on the contact surface of the square angle ruler and the frame to fix the square angle ruler;
(4) selecting a cutter according to the state and the precision requirement of the frame in the processing stage, adjusting the rotating speed of a main shaft and setting the feeding amount at the same time, and adopting cooling lubricating liquid;
(5) respectively mounting C, D processing test blocks on the outer side surfaces of the C, D holes of the frame in a threaded manner, processing inner holes of the C processing test blocks, rotating the workbench by 180 degrees, and processing the inner holes of the D processing test blocks;
(6) installing a dial indicator on a spindle of the horizontal boring machine, penetrating through buses on inner hole sides of test blocks machined at two ends of a pull meter, and moving a workbench along an X-direction coordinate to eliminate the position error of the spindle of the horizontal boring machine and the workbench if the reading of the dial indicator is greater than 0.002 mm;
(7) after moving the workbench along the X-direction coordinate, repeating the step (5) to process C, D at two ends to process the inner holes of the test block, and repeating the step (6) until the reading of the dial indicator is less than 0.002 mm;
(8) removing C, D the processing test block, and processing C, D holes of the frame;
(9) rotating the workbench by 90 degrees, and processing a hole A; and then, rotating the workbench by 180 degrees, and processing the hole B.
Further, in step (1): the flatness error between the bottom surface and each side surface of the thin-wall titanium alloy frame is less than 0.002mm, the verticality error between the bottom surface and each side surface of the thin-wall titanium alloy frame is less than 0.005mm, and the verticality error between the adjacent side surfaces of the thin-wall titanium alloy frame is less than 0.005 mm.
Furthermore, C, D holes of the frame are bearing holes, C, D holes of the frame are provided with shafts, and the outer end face of A, B holes of the frame is provided with the shafts.
Further, in step (3): the mutual verticality error between the four side surfaces of the square angle square is less than 0.002 mm.
Further, in the step (4): the integral hard alloy YG8 cutter is selected, the rotation speed of the main shaft is adjusted to 80 r/min, the feed rate is set to 0.04 mm/r, and No. 20 engine oil is used as cooling and lubricating liquid.
Further, in step (5): and C, after the inner hole of the test block is machined, rotating the workbench for 180 degrees, straightening the square angle ruler by the dial indicator through the micro-rotating workbench until the maximum reading difference value of the dial indicator is less than 0.002mm, eliminating the rotation error of the workbench, and machining the inner hole of the test block.
Further, in step (9): and after the hole A is machined, rotating the workbench by 180 degrees, straightening the square angle ruler by the dial indicator through rotating the micro workbench until the maximum reading difference of the dial indicator is less than 0.002mm, eliminating the rotation error of the workbench, and machining the hole B.
Compared with the prior art, the invention has the beneficial effects that:
in the invention, when a high-precision thin-wall titanium alloy frame is processed, the rotation precision of a horizontal boring machine is calibrated by placing a square angle square on the top surface of the frame, and the central position precision of a spindle and a workbench of the horizontal boring machine is calibrated by processing a test block C, D, so that the processing precision of the high-precision thin-wall titanium alloy frame is ensured; the deformation of the high-precision thin-wall titanium alloy frame is reduced by selecting a reasonable press-fitting mode and a cutter, and the processing period is shortened;
in conclusion, the machining deformation can be effectively controlled and reduced when the high-precision thin-wall titanium alloy frame is machined, the form and position tolerance of a shaft system is ensured, and the surface machining quality of the thin-wall titanium alloy frame in boring machining is improved.
Drawings
FIG. 1 is a three-dimensional view of a frame according to the present invention;
FIG. 2 is a right sectional view of the frame of FIG. 1;
FIG. 3 is a front cross-sectional view of the frame of FIG. 1;
FIG. 4 is a schematic view of a positioning reference of FIG. 3;
FIG. 5 is a three-dimensional view of a square placed on the top surface of the frame;
FIG. 6 is a schematic structural view illustrating the C, D processing test block being mounted on the outer side of the hole C, D of the frame in FIG. 5;
fig. 7 is a left sectional view of fig. 6.
Description of the drawings: 1. the frame, 2, square angle square, 3, C processing test block, 4, D processing test block.
Detailed Description
As shown in fig. 1, 2 and 3, the thin-wall titanium alloy frame 1 is a square frame with open top and bottom surfaces, A, B through holes are formed in the middle-lower parts of the front side surface and the rear side surface of the frame 1, C, D threaded through holes are formed in the middle-upper parts of the left side surface and the right side surface of the frame 1, central axes of A, B holes coincide, central axes of A, B holes are perpendicular to and intersect with a vertical central line of the frame 1, central axes of C, D holes coincide, and central axes of C, D holes are perpendicular to and intersect with a vertical central line of the frame 1. The main technical requirements of the frame are as follows: C. the coaxiality of the hole D is required to be less than or equal to phi 0.003 mm; A. the coaxiality of the hole B is required to be less than or equal to phi 0.003 mm; A. the perpendicularity error between the outer end face of the hole B and the central axis of A, B is less than or equal to 0.003 mm; A. the perpendicularity error of the central axis B and the central axis C, D is less than or equal to 0.005 mm.
The steps of processing A, B holes and C, D holes of the frame 1 by adopting the method of the invention are as follows:
(1) grinding the bottom surface X and the four side surfaces N of the thin-wall titanium alloy frame 1 to ensure that the flatness error of the bottom surface X and each side surface N of the frame 1 is less than 0.002mm, the verticality error between the bottom surface X and each side surface N of the frame 1 is less than 0.005mm, and the verticality error between the adjacent side surfaces N of the frame 1 is less than 0.005mm, wherein the bottom surface X is taken as a positioning reference as shown in FIG. 4;
(2) placing the bottom surface X of the frame 1 on a workbench surface of a horizontal boring machine, installing a dial indicator on a spindle of the horizontal boring machine, moving the frame 1 along a Z-direction coordinate of the horizontal boring machine to check the appearance of the frame 1, and finely adjusting the frame 1 to enable the reading of the dial indicator to be less than 0.02 mm; rotating the workbench by 90 degrees by the same detection method, so that the reading of the dial indicator is smaller than 0.02mm, the central axis of the A, B hole of the frame 1 is intersected with the rotation center of the workbench, the central axis of the C, D hole of the frame 1 is intersected with the rotation center of the workbench, thereby aligning the frame 1, and then uniformly pressing the boss in the frame 1 by a pressing plate;
(3) as shown in fig. 5, a square angle square 2 is placed on the top surface of a frame 1 to calibrate the rotation precision of the horizontal boring machine, specifically, a marker post provided with a micrometer is installed on a tailstock of the horizontal boring machine, a pointer of the micrometer is in contact with the square angle square 2, a workbench is rotated until the maximum reading difference of the micrometer is less than 0.002mm, and then glue is applied to the contact surface of the square angle square 2 and the frame 1 to fix the square angle square 2, so that the relative position of the square angle square 2 and the frame 1 is not changed due to the rotation of the workbench;
(4) according to the state and precision requirements of the frame 1 at the processing stage, a whole hard alloy YG8 cutter is selected, the rotating speed of a main shaft is adjusted to 80 revolutions per minute, the feeding amount is set to 0.04mm per revolution, and No. 20 engine oil is adopted as cooling lubricating liquid;
(5) as shown in fig. 6 and 7, a C processing test block 3 and a D processing test block 4 are respectively installed on the outer side surface of the C, D hole of the frame 1 in a threaded manner, an inner hole of the C processing test block 3 is processed, the workbench is rotated by 180 degrees, the micrometer rotates the workbench, the micrometer straightens the square angle 2 until the maximum reading difference value of the micrometer is less than 0.002mm, the rotation error of the workbench is eliminated, and the inner hole of the D processing test block 4 is processed;
(6) installing a dial indicator on a spindle of the horizontal boring machine, penetrating through buses on inner hole sides of test blocks machined at two ends of a pull meter, and moving a workbench along an X-direction coordinate to eliminate the position error of the spindle of the horizontal boring machine and the workbench if the reading of the dial indicator is greater than 0.002 mm;
(7) after moving the workbench along the X-direction coordinate, repeating the step (5) to process the inner holes of the test block 3C and the test block 4D at the two ends, and repeating the step (6) until the reading of the dial indicator is less than 0.002mm, so that the processed part can ensure the requirement of the coaxiality of the C, D holes;
(8) c, removing the C processing test block 3 and the D processing test block 4, and processing C, D holes of the frame 1;
(9) and (3) rotating the workbench by 90 degrees to process the hole A, then rotating the workbench by 180 degrees, straightening the square angle ruler 2 by the dial indicator through the micro-rotating workbench until the maximum reading difference value of the dial indicator is less than 0.002mm, eliminating the rotation error of the workbench, and processing the hole B.
The C, D holes of the frame 1 are bearing holes, the C, D holes of the frame 1 are provided with a shaft system, and the outer end face of the A, B holes of the frame 1 is provided with a shaft.
Wherein, in the step (3): the mutual verticality error between the four side surfaces of the square angle square 2 is less than 0.002 mm.
Claims (7)
1. The boring processing method of the high-precision thin-wall titanium alloy frame is characterized in that the frame is a square frame, the top surface and the bottom surface of the frame are open, A, B through holes are formed in the middle lower parts of the front side surface and the rear side surface of the frame, C, D threaded through holes are formed in the middle upper parts of the left side surface and the right side surface of the frame, the central axes of A, B holes are overlapped, the central axes of A, B holes are perpendicular to and intersected with the vertical central line of the frame, the central axes of C, D holes are overlapped, and the central axes of C, D holes are perpendicular to and intersected with the vertical central line of:
(1) grinding the bottom surface and the side surfaces of the thin-wall titanium alloy frame to ensure the flatness of the bottom surface and the side surfaces of the frame, the verticality between the bottom surface and each side surface and the verticality between the adjacent side surfaces, and taking the bottom surface as a positioning reference;
(2) placing the bottom surface of the frame on the working table surface of a horizontal boring machine, installing a dial indicator on a spindle of the horizontal boring machine, moving the frame along a Z-direction coordinate of the horizontal boring machine to check the appearance of the frame, and finely adjusting the frame to enable the reading of the dial indicator to be less than 0.02 mm; rotating the workbench by 90 degrees, wherein the detection method is the same as the above, so that the reading of the dial indicator is smaller than 0.02mm, the central axis of an A, B hole of the frame is intersected with the rotation center of the workbench, and the central axis of a C, D hole of the frame is intersected with the rotation center of the workbench, thereby aligning the frame, and then uniformly pressing a boss in the frame by a pressing plate;
(3) placing a square angle ruler at the top surface of the frame to calibrate the rotation precision of the horizontal boring machine, specifically, installing a marking rod provided with a micrometer on a tail seat of the horizontal boring machine, enabling a pointer of the micrometer to be in contact with the square angle ruler, rotating a working table until the maximum reading difference value of the micrometer is less than 0.002mm, and then dispensing glue on the contact surface of the square angle ruler and the frame to fix the square angle ruler;
(4) selecting a cutter according to the state and the precision requirement of the frame in the processing stage, adjusting the rotating speed of a main shaft and setting the feeding amount at the same time, and adopting cooling lubricating liquid;
(5) respectively mounting C, D processing test blocks on the outer side surfaces of the C, D holes of the frame in a threaded manner, processing inner holes of the C processing test blocks, rotating the workbench by 180 degrees, and processing the inner holes of the D processing test blocks;
(6) installing a dial indicator on a spindle of the horizontal boring machine, penetrating through buses on inner hole sides of test blocks machined at two ends of a pull meter, and moving a workbench along an X-direction coordinate to eliminate the position error of the spindle of the horizontal boring machine and the workbench if the reading of the dial indicator is greater than 0.002 mm;
(7) after moving the workbench along the X-direction coordinate, repeating the step (5) to process C, D at two ends to process the inner holes of the test block, and repeating the step (6) until the reading of the dial indicator is less than 0.002 mm;
(8) removing C, D the processing test block, and processing C, D holes of the frame;
(9) rotating the workbench by 90 degrees, and processing a hole A; and then, rotating the workbench by 180 degrees, and processing the hole B.
2. The boring processing method of the high-precision thin-wall titanium alloy frame as claimed in claim 1, wherein in the step (1): the flatness error between the bottom surface and each side surface of the thin-wall titanium alloy frame is less than 0.002mm, the verticality error between the bottom surface and each side surface of the thin-wall titanium alloy frame is less than 0.005mm, and the verticality error between the adjacent side surfaces of the thin-wall titanium alloy frame is less than 0.005 mm.
3. The boring processing method of the high-precision thin-wall titanium alloy frame as claimed in claim 1, wherein: the C, D hole of frame is the bearing hole, and C, D hole dress shafting of frame, the outer terminal surface department of the A, B hole of frame dress axle.
4. The boring processing method of a high-precision thin-wall titanium alloy frame as claimed in claim 1, wherein in the step (3): the mutual verticality error between the four side surfaces of the square angle square is less than 0.002 mm.
5. The boring processing method of the high-precision thin-wall titanium alloy frame as claimed in claim 1, wherein in the step (4): the integral hard alloy YG8 cutter is selected, the rotation speed of the main shaft is adjusted to 80 r/min, the feed rate is set to 0.04 mm/r, and No. 20 engine oil is used as cooling and lubricating liquid.
6. The boring processing method of the high-precision thin-wall titanium alloy frame as claimed in claim 1, wherein in the step (5): and C, after the inner hole of the test block is machined, rotating the workbench for 180 degrees, straightening the square angle ruler by the dial indicator through the micro-rotating workbench until the maximum reading difference value of the dial indicator is less than 0.002mm, eliminating the rotation error of the workbench, and machining the inner hole of the test block.
7. The boring processing method of a high-precision thin-wall titanium alloy frame as claimed in claim 1, wherein in the step (9): and after the hole A is machined, rotating the workbench by 180 degrees, straightening the square angle ruler by the dial indicator through rotating the micro workbench until the maximum reading difference of the dial indicator is less than 0.002mm, eliminating the rotation error of the workbench, and machining the hole B.
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| CN202011475197.6A CN112589148A (en) | 2020-12-15 | 2020-12-15 | Boring machining method for high-precision thin-wall titanium alloy frame |
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| CN202011475197.6A CN112589148A (en) | 2020-12-15 | 2020-12-15 | Boring machining method for high-precision thin-wall titanium alloy frame |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113814434A (en) * | 2021-09-16 | 2021-12-21 | 江西省宝凯科技有限公司 | Quick alignment method for manufacturing electric smelting tee pipe fitting press fitting tool during boring |
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| US4329094A (en) * | 1978-10-30 | 1982-05-11 | General Electric Company | Boring and facing apparatus for use inside a large vessel |
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Application publication date: 20210402 |