CN111300178A - Method for controlling grinding deformation of central pull rod of helicopter - Google Patents
Method for controlling grinding deformation of central pull rod of helicopter Download PDFInfo
- Publication number
- CN111300178A CN111300178A CN202010210807.3A CN202010210807A CN111300178A CN 111300178 A CN111300178 A CN 111300178A CN 202010210807 A CN202010210807 A CN 202010210807A CN 111300178 A CN111300178 A CN 111300178A
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- China
- Prior art keywords
- grinding
- helicopter
- deformation
- controlling
- pull rod
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
- B24B5/02—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work
- B24B5/04—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work for grinding cylindrical surfaces externally
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B1/00—Methods for turning or working essentially requiring the use of turning-machines; Use of auxiliary equipment in connection with such methods
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B5/00—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/005—Feeding or manipulating devices specially adapted to grinding machines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
- B24B41/061—Work supports, e.g. adjustable steadies axially supporting turning workpieces, e.g. magnetically, pneumatically
- B24B41/062—Work supports, e.g. adjustable steadies axially supporting turning workpieces, e.g. magnetically, pneumatically between centres; Dogs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B47/00—Drives or gearings; Equipment therefor
- B24B47/20—Drives or gearings; Equipment therefor relating to feed movement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
- B24B49/006—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation taking regard of the speed
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Abstract
The invention relates to a method for grinding the outer diameter of a slender shaft part, and provides a method for controlling grinding deformation by a central pull rod of a helicopter, which comprises the following steps: after blanking, carrying out solid solution aging on the parts; roughly turning the parts and carrying out ultrasonic inspection; carrying out semi-finish turning on the part to machine the appearance; and entering a grinding process, wherein a longitudinal grinding method is adopted for grinding the slender shaft part, and a small allowance grinding method that a grinding wheel is not separated from the grinding surface of the part is adopted when the intermittent shaft part of the part is ground. The invention controls the clamping force of the part by reducing the positioning and clamping area of the central hole of the part, and simultaneously adopts a novel grinding method to reduce the self-excited vibration generated in the grinding process of the part, thereby effectively controlling the deformation problem of the slender shaft type part in the processing. Meanwhile, a feasible excellent processing mode and parameter are explored, and the purpose of improving the processing precision of the part is achieved by using a simple and easy method.
Description
Technical Field
The invention relates to a method for grinding the outer diameter of a slender shaft part, in particular to a method for grinding the outer diameter of a center pull rod of a helicopter.
Background
The central pull rod is an important component of a hot end part of a helicopter engine. The bending deformation of the helicopter component belongs to a slender shaft type part, can be influenced by machining resistance and self-excited vibration in the machining process, and has higher technological requirements for parts on the helicopter. In the past, one or more central supports are adopted to process slender shafts to add auxiliary supports for parts, so that the processing deformation of the parts is reduced, and the technical requirements are met. The use of a central support to process products has certain disadvantages: 1. when the central support is used for machining the slender shaft, the central support needs to be subjected to a follow-up new adjustment process every time the allowance of 0.03mm is ground on the shaft diameter of a part, so that the preparation time of the part is increased, 16 hours are needed for grinding a product by using the method, the machining efficiency is low, and the risk of product machining out-of-tolerance is also born when the central support is not used properly. 2. Because one end of the part is an orifice with the diameter of 8, when the part is clamped, the part is clamped and deformed due to the large clamping pressure generated by the large contact area between the part and the top of the machine tool, which is also a main factor restricting the qualification of products. 3. The grinding resistance is generally reduced by grinding the slender shaft by adopting a longitudinal grinding method, but when a part such as a central pull rod with an intermittent grinding part in the middle is ground, the circular run-out of the part after grinding can not be ensured to be within 0.01mm only by adopting the longitudinal grinding method, and even if the circular run-out is qualified, the precision value of the part is limited to the edge with the maximum tolerance value, so that the processing quality is unstable.
Disclosure of Invention
The invention aims to provide a method for controlling grinding deformation of a central pull rod of a helicopter, which can effectively control the deformation problem of slender shaft type parts in processing and improve the processing precision of the parts.
The technical scheme adopted by the invention is as follows:
a method for controlling grinding deformation of a center pull rod of a helicopter, comprising the following steps:
after blanking, carrying out solid solution aging on the parts;
roughly turning the parts and carrying out ultrasonic inspection;
carrying out semi-finish turning on the part to machine the appearance;
and entering a grinding process, wherein a longitudinal grinding method is adopted for grinding the slender shaft part, and a small allowance grinding method that a grinding wheel is not separated from the grinding surface of the part is adopted when the intermittent shaft part of the part is ground.
In the grinding process, a small-taper mandrel is configured for grinding the part, and the taper of the mandrel is 1: 2000.
the part is arranged between two apexes of a grinding machine, and a new processing standard is formed by the aid of a phi 2mm central hole of the part and a phi 2mm technological central hole on a small-taper mandrel at the other end of the part.
The part is arranged between two tips of a grinding machine, and the jacking pressure takes the minimum pressure of the part which does not jump between the two tips as a reference standard, so that the part is clamped under zero pressure which is close to a free state.
The small allowance grinding method has the advantage that the grinding wheel and the grinding surface of the part are not separated, and the feeding amount of each grinding is 0.002 mm.
The small allowance grinding method has the advantage that the grinding wheel and the grinding surface of the part are not separated, and the longitudinal feed speed is 50 mm/min.
The small allowance grinding method is characterized in that the grinding wheel and the grinding surface of the part are not separated, and the contact area of the grinding wheel and the two sides of the part are not less than 2 mm.
And (5) semi-finish turning the appearance, and keeping the allowance of 0.15mm for the diameter of each outer shaft.
The invention has the beneficial effects that:
the clamping force of the part is controlled by reducing the positioning and clamping area of the central hole of the part, and meanwhile, the self-excited vibration generated in the grinding process of the part is reduced by adopting a novel grinding method, so that the deformation problem of the slender shaft type part in the processing process is effectively controlled. Meanwhile, a feasible excellent processing mode and parameter are explored, and the purpose of improving the processing precision of the part is achieved by using a simple and easy method.
Drawings
Fig. 1 is a schematic view of a central pull rod structure.
Detailed description of the preferred embodiments
The invention provides a method for controlling grinding deformation of a central pull rod of a helicopter, which comprises the steps of carrying out solid solution aging on a part after blanking to improve the cutting performance of the material, then roughly turning the part, carrying out ultrasonic inspection to check whether the part has processing defects, finally carrying out semi-finish turning on the part to obtain a machined shape, and entering a grinding process after the allowance of the diameter of each outer shaft is 0.15 mm.
In the grinding process, a small-taper mandrel is firstly configured for grinding the part, and the taper of the mandrel is 1: 2000. so as to ensure that the pressure is not excessively concentrated on one point when the mandrel is assembled with the inner hole of the part, and the part is assembled and deformed. When the mandrel and the part are assembled, the mandrel is manually pushed into the inner hole of the part in a rotating mode, the mandrel and the inner hole of the part are tightly held without bouncing, and the assembling pressure of the part and the mandrel reaches an optimal value. At the moment, a part forms a new processing standard by utilizing a phi 2mm central hole of the part and a phi 2mm technological central hole on a small-taper mandrel at the other end. The part is arranged between two tips of the grinding machine, the jacking pressure takes the minimum pressure of the part which does not shift between the two tips as a reference standard, the part is clamped at zero pressure close to a free state, and the clamping deformation of the part is reduced by controlling the machining deformation. The grinding resistance of the part is reduced by grinding the slender shaft part by adopting a longitudinal grinding method, and the grinding vibration and the self-excited vibration of the part are effectively reduced by adopting a small-allowance grinding method that a grinding wheel is not separated from the grinding surface of the part when the discontinuous shaft diameter part of the part is ground, so that the problem of grinding bounce of the part is solved. The machined part is shown in fig. 1.
The invention can effectively ensure the processing quality of the central pull rod by adopting a new grinding method and adopting a technological central hole to reduce the clamping force.
1. In the machining process, the size of the positioning contact area determines the size of the clamping force when the part is clamped. Therefore, the positioning contact area is reduced by manufacturing an ideal technological center hole by using a matched and ground small-taper mandrel, and the zero-pressure clamping state close to the free state is realized. The principle is the same as that of using a central support to reduce self-excited vibration of parts, but the zero-pressure clamping target is fundamentally realized, so that the processing quality of the parts is improved.
2. The invention replaces the function of the central support and saves the preparation time for adjusting the central support, so the processing efficiency of parts is improved from the original 16-hour processing of one product to 8-hour processing of one product, and the efficiency is improved by 200%.
3. The small-allowance grinding method which is adopted by the invention and has the advantages that the grinding wheel and the grinding surface of the part are not separated, the feeding amount of grinding each time is 0.002mm, the longitudinal feed speed is 50mm/min, and the two sides of the contact area of the grinding wheel and the part are not less than 2mm respectively, so that the grinding vibration and the self-excited vibration of the part are effectively reduced, the deflection amount of the part generated by the self-excited vibration can be completely ground by the grinding wheel in the grinding process, the circumferential symmetry of the part is ensured to be uniform, the circular runout is not more than 0.005mm, and the technical requirement of the part is ensured with.
The invention can make the product percent of pass reach 100%, meet the use requirement and provide a new idea for the processing of products with similar structures and precision.
Claims (8)
1. A method for controlling grinding deformation of a central pull rod of a helicopter is characterized by comprising the following steps:
after blanking, carrying out solid solution aging on the parts;
roughly turning the parts and carrying out ultrasonic inspection;
carrying out semi-finish turning on the part to machine the appearance;
and entering a grinding process, wherein a longitudinal grinding method is adopted for grinding the slender shaft part, and a small allowance grinding method that a grinding wheel is not separated from the grinding surface of the part is adopted when the intermittent shaft part of the part is ground.
2. The method for controlling grinding deformation of the center pull rod of the helicopter of claim 1,
in the grinding process, a small-taper mandrel is configured for grinding the part, and the taper of the mandrel is 1: 2000.
3. the method for controlling grinding deformation of the center pull rod of the helicopter in claim 2,
the part is arranged between two apexes of a grinding machine, and a new processing standard is formed by the aid of a phi 2mm central hole of the part and a phi 2mm technological central hole on a small-taper mandrel at the other end of the part.
4. The method for controlling grinding deformation of the center pull rod of the helicopter as claimed in claim 3, characterized in that the part is loaded between two tips of the grinding machine, and the jacking pressure is based on the minimum pressure of the part which does not shift between the two tips, so that the part is in zero-pressure clamping which is close to a free state.
5. The method for controlling grinding deformation of the center draw rod of the helicopter of claim 1, wherein the grinding feed per grinding is 0.002mm by a small margin grinding method in which the grinding wheel is not separated from the grinding surface of the part.
6. The method for controlling grinding deformation of the center pull rod of the helicopter as claimed in claim 5, wherein the longitudinal feed speed is 50mm/min for a small margin grinding method in which the grinding wheel does not separate from the grinding surface of the part.
7. The method for controlling grinding deformation of a center stay of a helicopter of claim 6 wherein the grinding wheel is not detached from the ground surface of the part by a small allowance grinding method, and the contact area between the grinding wheel and the part is not less than 2mm on both sides.
8. The method for controlling grinding deformation of a center stay of a helicopter of claim 1 wherein the profile is semi-finish turned with a margin of 0.15mm for each outer shaft diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010210807.3A CN111300178B (en) | 2020-03-20 | 2020-03-20 | Method for controlling grinding deformation of central pull rod of helicopter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010210807.3A CN111300178B (en) | 2020-03-20 | 2020-03-20 | Method for controlling grinding deformation of central pull rod of helicopter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111300178A true CN111300178A (en) | 2020-06-19 |
| CN111300178B CN111300178B (en) | 2022-07-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010210807.3A Active CN111300178B (en) | 2020-03-20 | 2020-03-20 | Method for controlling grinding deformation of central pull rod of helicopter |
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| CN (1) | CN111300178B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111975462A (en) * | 2020-07-10 | 2020-11-24 | 中国航发哈尔滨东安发动机有限公司 | Grinding processing method for slender shaft workpiece |
Citations (6)
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| SU730526A1 (en) * | 1976-02-09 | 1980-04-30 | Предприятие П/Я Р-6681 | Method of making thin-wall cylinder with through cam grooves |
| CN202928545U (en) * | 2012-11-12 | 2013-05-08 | 中国航空工业第六一八研究所 | Combined type tool used for processing blind hole thin wall sensor winding |
| CN105537860A (en) * | 2014-10-31 | 2016-05-04 | 陕西天财工程造价咨询有限公司 | Machining method for vacuum pump rotor |
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Patent Citations (6)
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|---|---|---|---|---|
| SU730526A1 (en) * | 1976-02-09 | 1980-04-30 | Предприятие П/Я Р-6681 | Method of making thin-wall cylinder with through cam grooves |
| CN202928545U (en) * | 2012-11-12 | 2013-05-08 | 中国航空工业第六一八研究所 | Combined type tool used for processing blind hole thin wall sensor winding |
| CN105537860A (en) * | 2014-10-31 | 2016-05-04 | 陕西天财工程造价咨询有限公司 | Machining method for vacuum pump rotor |
| CN107470856A (en) * | 2017-07-10 | 2017-12-15 | 张真真 | A kind of processing technology of thin-walled tube kind part |
| CN108274193A (en) * | 2018-01-12 | 2018-07-13 | 中国航发哈尔滨东安发动机有限公司 | A kind of insulation guide post processing method with thin-walled nylon bushing |
| CN110449848A (en) * | 2019-09-23 | 2019-11-15 | 沈阳三科核电设备制造股份有限公司 | A kind of processing technology of built-up welding Si Taili hard alloy thin-walled set |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111975462A (en) * | 2020-07-10 | 2020-11-24 | 中国航发哈尔滨东安发动机有限公司 | Grinding processing method for slender shaft workpiece |
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| CN111300178B (en) | 2022-07-08 |
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