CN110936108A - Machining method for improving assembly precision of thin-wall annular casing type parts - Google Patents
Machining method for improving assembly precision of thin-wall annular casing type parts Download PDFInfo
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- CN110936108A CN110936108A CN201911130760.3A CN201911130760A CN110936108A CN 110936108 A CN110936108 A CN 110936108A CN 201911130760 A CN201911130760 A CN 201911130760A CN 110936108 A CN110936108 A CN 110936108A
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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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Abstract
The invention discloses a processing method for improving the assembly precision of thin-wall annular casing parts, which comprises the following steps: the method comprises the following steps: determining a part mating surface; step two: determining a machining process route, wherein the process route is as follows; step three: adjusting the machining allowance; step four: processing the parts according to the process route. According to the invention, by optimizing the machining process route of the thin-wall annular casing type part and adopting the limiting tool simulating the assembly state for machining and detecting, the assembly precision of the part is improved, the errors of the machining and assembly states are eliminated, the problem of high repair rate of the part is solved, the production period is shortened, and the cost is reduced.
Description
Technical Field
The invention relates to the field of machining of thin-wall annular casing parts, and particularly provides a machining method for improving assembly precision of thin-wall annular casing parts.
Background
Because thin-wall annular casing parts have the characteristics of poor rigidity, easy deformation and high precision requirement, designers often give numerical values of two states, namely a limiting state and a free state, to form and position tolerance on part design drawings. The traditional process is used for detecting the limit state instead of checking on a machine tool, and the consistency of the detection state and the assembly state during processing is not considered, so that the technical indexes are unqualified during assembly of the component, the repair rate is extremely high, and the efficiency is seriously influenced.
Disclosure of Invention
The invention aims to provide a processing method for improving the assembly precision of thin-wall annular casing parts, which improves the assembly precision of the parts, eliminates errors of the processing and assembly states, solves the problem of high repair rate of the parts, and can also shorten the production period and reduce the cost by optimizing the mechanical processing process route of the thin-wall annular casing parts and adopting a limiting tool for simulating the assembly state to process and detect.
The technical scheme of the invention is as follows: a processing method for improving the assembly precision of thin-wall annular casing parts comprises the following steps:
the method comprises the following steps: determining the fitting surface of the part:
determining a positioning reference, a matching surface and a mutual position relation of a part in the component according to a component design drawing;
step two: determining a machining process route, wherein the process route comprises the following steps:
the sample No. 5 was scribed to check the machining allowance (see FIG. 3);
because the part is a thin-wall welding structure, the part deforms after welding, and the reserved machining allowance changes; the process is arranged before mechanical processing, namely, a scribing method is adopted to check the uniformity of the machining allowance of each machining surface, the position with uneven allowance or negative allowance is found as soon as possible, and adjustment and rescue are carried out as soon as possible, so that great economic loss is avoided;
the sample No. 10 was roughened at the front end face (see FIG. 1);
turning to remove most of the allowance of the front end face, and reserving 2mm allowance for semi-finish turning and finish turning;
rough turning of the rear end face in the No. 15 step (see FIG. 1);
turning to remove most of the allowance of the rear end face, and reserving 2mm allowance for fine turning;
front end of semi-finished bicycle in No. 20 step (see FIG. 1);
turning to remove the allowance of the front end face, ensuring the flatness of the end face to be 0.03max, providing a better processing reference for finish turning, and reserving 1mm of allowance for finish turning on the front end face;
no. 25 process for finish turning of the rear end and the inner bore;
machining the surfaces of the rear ends except phi B and phi C (shown in figure 2) on the inner ring in place; the phi B and phi C (shown in figure 2) surfaces on the inner ring are assembly matching surfaces, the precision requirement is high, in order to avoid the influence of subsequent milling, boring and drilling machining processes on the precision, the process leaves a machining allowance of 0.2 mm-0.3 mm on the matching surfaces, the machining allowance is not machined to the final size, a process of finely turning an inner hole with No. 60 is arranged after all machining processes, and the matching surfaces are machined;
no. 30 process fine front end and inner hole;
machining the surfaces of the front ends except the phi A (shown in figure 2) on the inner ring in place; the surface of phi A (shown in figure 2) on the inner ring is a component matching surface, the precision requirement is higher, in order to avoid the influence of subsequent milling, boring and drilling machining processes on the precision, the machining allowance of 0.2 mm-0.3 mm is reserved on the matching surface in the process, the machining allowance is not machined to the final size, a process of finely turning an inner hole with No. 60 is arranged after all machining processes, and the matching surface is machined;
the hole on the rear end face and the chamfer in the step of boring in No. 35;
processing the axial hole on the rear end face in place to ensure the requirements of the design size and the form and position tolerance;
the hole on the front end face and chamfer in the No. 40 process;
processing the axial hole on the front end face in place to ensure the requirements of the design size and the form and position tolerance;
the small grooves of the inner ring and the outer ring are milled in the step No. 45;
processing the front end inner ring small groove and the front end outer ring groove in place to ensure the requirements of design size and form and position tolerance;
the sample No. 50 is drilled by milling the inner ring plane;
processing the axial hole on the front end face in place to ensure the requirements of the design size and the form and position tolerance;
boring a mounting seat plane and a hole on an outer ring in a No. 55 process;
processing the axial hole on the front end face in place to ensure the requirements of the design size and the form and position tolerance;
no. 60 process for finish turning of inner hole;
in order to ensure that the radial runout of the inner ring is qualified, the process adopts a limiting fixture for simulating an assembly state to position, clamp and process, and the fixture is also used as a limiting tool for final form and position tolerance detection, so that the consistency of a processing state, a detection state and an assembly state can be ensured, the assembly precision is improved, and the repair is avoided;
the assembly reference in the part is a pitch circle of 16 precise holes phi A-phi 5G7 (shown in figure 1) on the rear end mounting edge, so that the limiting tool (shown in figures 4, 5 and 6) adopts 16 positioning pins corresponding to the 16 precise holes phi A-phi 5G7 (shown in figure 1) on the large end mounting edge as a positioning reference, ensures that the reference is superposed and is consistent with the assembly state;
the limiting clamp comprises a base 1, 8 pressing plates 2, 16 positioning pins 3, an adjusting nut 4, a supporting screw rod 5, a fastening nut 6, a connecting stud 7, a washer 8, a spring 9 and 8 screws 10 (shown in figure 4), wherein the bottom plane of the base 1 is taken as an axial reference, an excircle alignment belt A is taken as a radial reference, the position degree of the 16 positioning pins 3 relative to the reference A is 0.01mm, and the matching precision of pins and holes is f 7; the adjusting nut 4 and the supporting screw 5 form a pressing plate supporting mechanism for supporting the pressing plate and adjusting the height of the pressing plate; the fastening nut 6, the connecting stud 7, the washer 8, the spring 9 and the screw 10 form a pressing plate fastening mechanism for pressing the part; the locating pin is used for simulating the limiting part in the assembling state.
The invention has the following beneficial effects:
according to the invention, by optimizing the machining process route of the thin-wall annular casing type part and adopting the limiting tool simulating the assembly state for machining and detecting, the assembly precision of the part is improved, the errors of the machining and assembly states are eliminated, the problem of high repair rate of the part is solved, the production period is shortened, and the cost is reduced.
Drawings
FIG. 1 is a schematic diagram of an outer ring structure of a casing;
FIG. 2 is a schematic view of an inner ring structure of the casing;
FIG. 3 is a schematic view showing the machining allowance in the process of scribing and inspecting the No. 5 alloy;
FIG. 4 is a sectional view of a female hole finishing jig in the No. 60 process;
FIG. 5 is a plan view of a female hole finishing jig in No. 60 process;
FIG. 6 is a schematic view showing the angular distribution of positioning pins of a limiting jig for finish turning of an inner hole in a No. 60 process;
in the figure: 1. a base; 2. pressing a plate; 3. positioning pins; 4. adjusting the nut; 5. a support screw; 6. fastening a nut; 7. connecting a stud; 8. a gasket; 9. a spring; 10. and (4) screws.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
As shown in fig. 1-6, a processing method for improving assembly accuracy of thin-wall annular casing parts includes the following steps:
the method comprises the following steps: determining the fitting surface of the part:
determining a positioning reference, a matching surface and a mutual position relation of a part in the component according to a component design drawing;
step two: determining a machining process route, wherein the process route comprises the following steps:
in the No. 5 process, a scribe check is performed on machining allowance → No. 10 process rough turning front end face (see fig. 1) → No. 15 process rough turning rear end face (see fig. 1) → No. 20 process semi-finish turning front end face (see fig. 1) → No. 25 process finish turning rear end face and inner hole → No. 30 process finish turning front end face hole and inner hole → No. 35 process boring rear end face hole and chamfer → No. 40 process boring front end face hole and chamfer → No. 45 process inner ring and outer ring slot → No. 50 process milling inner ring plane and drilling → No. 55 process boring outer ring mounting seat plane and hole → No. 60 process finish turning inner hole
Step three: adjusting the machining allowance:
in the step of No. 25 and the step of No. 30, machining allowance of 0.2 mm-0.3 mm is reserved on the matching surface, namely three inner circle surfaces of the inner ring, and the matching surface is not machined to the final size, and after all machining steps, a step of No. 60 is added to finish machining of the matching surface so as to avoid the influence of machining deformation caused by the machining steps of milling, boring and drilling on the final precision of the matching size of the inner circle;
step four: processing the parts according to the process route;
(1) performing a step of No. 5 to complete the uniformity inspection of the machining allowance;
(2) performing a step of No. 10 (see fig. 1) and a step of No. 15 (see fig. 1) to finish rough machining of the front and rear end faces and remove most of the remaining amount;
(3) carrying out a step of repairing the sample No. 20 (see FIG. 1) to finish the repair of the finish turning reference;
(4) carrying out a step of No. 25 and a step of No. 30 to finish the finish machining of the machined surfaces of the front end and the rear end except the inner circle of the inner ring, wherein the inner circle of the inner ring has a margin of 0.2-0.3 mm;
(5) drilling and milling all holes and grooves in the part by performing a step of No. 35, a step of No. 40, a step of No. 45, a step of No. 50, and a step of No. 55;
(6) the step of No. 60 was performed to finish the inner circle of the inner ring.
The specific operation steps for finishing the inner circle of the inner ring by performing the step of No. 60 are as follows:
the method comprises the following steps: installing a limiting clamp on a machine tool workbench, and aligning a clamp alignment belt A;
step two: placing the part on a limiting clamp for finish turning, performing radial positioning by using 16 precise pins, and symmetrically and uniformly compressing the part by using a force limiting wrench;
step three: processing the part in a limiting state, so that the part is processed in a simulated assembly state, and the processing of the reserved allowance of the previous procedure is completed; processing the inner circle surface of the inner ring of the part to a final state, and unloading the part;
step four: detecting a part in a limiting state;
and placing the part into a limiting clamp for detection, and sending the part to a three-coordinate measuring machine to detect various technical indexes of the inner circle matching surface of the inner ring in a simulated assembly state.
The limit clamp for finish turning is the same as the limit clamp structure that is used for detecting, includes: the device comprises a base 1, 8 press plates 2, 16 positioning pins 3, 8 groups of press plate supporting mechanisms and 8 groups of press plate fastening mechanisms; the 16 positioning pins 3 are fixed in the base 1, the 8 pressing plates 2 are supported by 8 groups of pressing plate supporting mechanisms and the heights of the pressing plates 2 are adjusted, and the 8 pressing plates 2 press parts by 8 groups of pressing plate fastening mechanisms; the pressing plate supporting mechanism comprises an adjusting nut 4 and a supporting screw rod 5, the lower part of the supporting screw rod 5 is connected with the base 1, the lower surface of the pressing plate 2 is supported by the upper part of the supporting screw rod, and the adjusting nut 4 is in threaded fit with the supporting screw rod 5; the pressing plate fastening mechanism comprises a fastening nut 6, a connecting stud 7, a washer 8, a spring 9 and a screw 10, the lower part of the connecting stud 7 is fixed in the base 1 through the screw 10, and the connecting stud 7 is matched with the spring 9, the fastening nut 6 and the washer 8.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (3)
1. A processing method for improving the assembly precision of thin-wall annular casing parts is characterized by comprising the following steps:
the method comprises the following steps: determining the fitting surface of the part:
determining a positioning reference, a matching surface and a mutual position relation of a part in the component according to a component design drawing;
step two: determining a machining process route, wherein the process route comprises the following steps:
the sample No. 5 was scribed to check the machining allowance;
rough turning of the tip face in the No. 10 step;
rough turning of the rear end face in the No. 15 step;
the tip of the sample No. 20 is semi-finish turned;
no. 25 process for finish turning of the rear end and the inner bore;
no. 30 process fine front end and inner hole;
the hole on the rear end face and the chamfer in the step of boring in No. 35;
the hole on the front end face and chamfer in the No. 40 process;
the small grooves of the inner ring and the outer ring are milled in the step No. 45;
the sample No. 50 is drilled by milling the inner ring plane;
boring a mounting seat plane and a hole on an outer ring in a No. 55 process;
no. 60 process for finish turning of inner hole;
step three: adjusting the machining allowance:
in the step of No. 25 and the step of No. 30, machining allowance of 0.2 mm-0.3 mm is reserved on the matching surface, namely three inner circle surfaces of the inner ring, and the matching surface is not machined to the final size, and after all machining steps, a step of No. 60 is added to finish machining of the matching surface so as to avoid the influence of machining deformation caused by the machining steps of milling, boring and drilling on the final precision of the matching size of the inner circle;
step four: processing the parts according to the process route;
(1) performing a step of No. 5 to complete the uniformity inspection of the machining allowance;
(2) performing a step of No. 10 and a step of No. 15 to finish rough machining of the front and rear end faces and remove most of the remaining amount;
(3) carrying out a step of repairing the sample No. 20 to finish the repair of the finish turning reference;
(4) carrying out a step of No. 25 and a step of No. 30 to finish the finish machining of the machined surfaces of the front end and the rear end except the inner circle of the inner ring, wherein the inner circle of the inner ring has a margin of 0.2-0.3 mm;
(5) drilling and milling all holes and grooves in the part by performing a step of No. 35, a step of No. 40, a step of No. 45, a step of No. 50, and a step of No. 55;
(6) the step of No. 60 was performed to finish the inner circle of the inner ring.
2. The machining method for improving the assembling accuracy of a thin-walled annular casing part according to claim 1, wherein the step of performing a No. 60 process to finish the inner circle of the inner ring comprises the following specific steps:
the method comprises the following steps: installing a limiting clamp on a machine tool workbench, and aligning a clamp alignment belt A;
step two: placing the part on a limiting clamp for finish turning, performing radial positioning by using 16 precise pins, and symmetrically and uniformly compressing the part by using a force limiting wrench;
step three: processing the part in a limiting state, so that the part is processed in a simulated assembly state, and the processing of the reserved allowance of the previous procedure is completed; processing the inner circle surface of the inner ring of the part to a final state, and unloading the part;
step four: detecting a part in a limiting state;
and placing the part into a limiting clamp for detection, and sending the part to a three-coordinate measuring machine to detect various technical indexes of the inner circle matching surface of the inner ring in a simulated assembly state.
3. The machining method for improving the assembly accuracy of the thin-wall annular casing part according to claim 2, wherein the limiting clamp for finish turning and the limiting clamp for detection are the same in structure and comprise the following steps: the device comprises a base (1), 8 press plates (2), 16 positioning pins (3), 8 groups of press plate supporting mechanisms and 8 groups of press plate fastening mechanisms; the 16 positioning pins (3) are fixed in the base (1), the 8 pressing plates (2) are supported by 8 groups of pressing plate supporting mechanisms and the heights of the pressing plates (2) are adjusted, and the 8 pressing plates (2) are pressed on parts by 8 groups of pressing plate fastening mechanisms; the pressing plate supporting mechanism comprises an adjusting nut (4) and a supporting screw rod (5), the lower part of the supporting screw rod (5) is connected with the base (1), the lower surface of the pressing plate (2) is supported by the upper part of the supporting screw rod, and the adjusting nut (4) is in threaded fit with the supporting screw rod (5); the pressing plate fastening mechanism comprises a fastening nut (6), a connecting stud (7), a washer (8), a spring (9) and a screw (10), the lower portion of the connecting stud (7) is fixed in the base (1) through the screw (10), and the connecting stud (7) is matched with the spring (9), the fastening nut (6) and the washer (8).
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Cited By (4)
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| CN112122550A (en) * | 2020-09-23 | 2020-12-25 | 贵州安吉航空精密铸造有限责任公司 | Investment casting process for thin-wall annular casing casting |
| CN112222771A (en) * | 2020-09-24 | 2021-01-15 | 中国航发沈阳黎明航空发动机有限责任公司 | Method for controlling position degree of support plate of bearing frame casting of inclined support plate |
| CN112355579A (en) * | 2020-10-29 | 2021-02-12 | 中国航发南方工业有限公司 | Machining method of rotary casing |
| CN113953772A (en) * | 2021-11-13 | 2022-01-21 | 中国航发沈阳黎明航空发动机有限责任公司 | Machining method for casting special-shaped mounting edge of cone ring block |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113953772A (en) * | 2021-11-13 | 2022-01-21 | 中国航发沈阳黎明航空发动机有限责任公司 | Machining method for casting special-shaped mounting edge of cone ring block |
| CN113953772B (en) * | 2021-11-13 | 2024-01-19 | 中国航发沈阳黎明航空发动机有限责任公司 | Machining method for special-shaped mounting edge of cast cone ring block |
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