CN111673143B - Method for machining precise deep hole by automatic compensation cutting of vibration reduction tool and casing - Google Patents
Method for machining precise deep hole by automatic compensation cutting of vibration reduction tool and casing Download PDFInfo
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- CN111673143B CN111673143B CN202010470998.7A CN202010470998A CN111673143B CN 111673143 B CN111673143 B CN 111673143B CN 202010470998 A CN202010470998 A CN 202010470998A CN 111673143 B CN111673143 B CN 111673143B
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- 238000003754 machining Methods 0.000 title claims abstract description 115
- 238000005520 cutting process Methods 0.000 title claims abstract description 113
- 230000009467 reduction Effects 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000012545 processing Methods 0.000 claims abstract description 41
- 238000013016 damping Methods 0.000 claims description 28
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 13
- 229910045601 alloy Inorganic materials 0.000 claims description 12
- 239000000956 alloy Substances 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 7
- 238000012937 correction Methods 0.000 claims description 4
- 238000003672 processing method Methods 0.000 claims description 2
- 238000005299 abrasion Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B41/00—Boring or drilling machines or devices specially adapted for particular work; Accessories specially adapted therefor
- B23B41/02—Boring or drilling machines or devices specially adapted for particular work; Accessories specially adapted therefor for boring deep holes; Trepanning, e.g. of gun or rifle barrels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B47/00—Constructional features of components specially designed for boring or drilling machines; Accessories therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q15/00—Automatic control or regulation of feed movement, cutting velocity or position of tool or work
- B23Q15/007—Automatic control or regulation of feed movement, cutting velocity or position of tool or work while the tool acts upon the workpiece
- B23Q15/14—Control or regulation of the orientation of the tool with respect to the work
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- B64D27/40—
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- B64D27/402—
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
- B64F5/00—Designing, manufacturing, assembling, cleaning, maintaining or repairing aircraft, not otherwise provided for; Handling, transporting, testing or inspecting aircraft components, not otherwise provided for
Abstract
The invention discloses a method for machining a precise deep hole by a vibration reduction cutter through automatic compensation cutting and a casing, wherein the machining allowance reserved for machining the precise deep hole is 3a, the machining allowance is machined to the final size by three times of feed machining, and the three times of feed machining comprises first feed, second feed and third feed; the three-time feed processing comprises the following steps: s1: the first feed processing is carried out, and the feed amount a1 of the first feed is
S2: measuring the aperture size of the precise deep hole, calculating the residual machining allowance A, and performing secondary feed machining, wherein the feed amount a2 of the secondary feed is a 2-A-a 1; s3: and measuring the aperture size of the precise deep hole, calculating the final machining allowance B, and performing third-time feed machining, wherein the feed amount a3 of the third-time feed is B. According to the machining method for automatically compensating and cutting the precise deep hole by the vibration reduction cutter, the cutter back-off error is automatically compensated and eliminated by utilizing the cutter back-off rule through three times of cutter feeding machining, the cutting stability is improved, and the machining precision and the surface quality of the precise deep hole are ensured.
Description
Technical Field
The invention relates to the field of machining of precise deep holes of casings of aeroengines, in particular to a machining method for automatically compensating and cutting precise deep holes by a vibration reduction cutter. In addition, the invention also relates to a casing prepared by the machining method for automatically compensating and cutting the precise deep hole by the vibration reduction tool.
Background
The complex titanium alloy and high-temperature alloy casings of the aircraft engines are often provided with some precise deep holes, the complex titanium alloy and high-temperature alloy casings are mainly used for mounting and matching bearings or precise components and the like, the dimensional precision, the form and position requirements and the surface quality requirements are extremely high, the diameter tolerance is 0.01-0.015, the cylindricity is less than 0.005, the coaxiality is less than 0.01, the surface roughness is less than Ra0.4 mu m, the complex titanium alloy and high-temperature alloy casings are machined by adopting a numerical control machine tool, a cutter needs to avoid the interference and the overhanging extension of a part structure, the length-diameter.
The vibration reduction cutter improves the dynamic stiffness of the cutter bar, reduces the cutting vibration of the cutter and improves the precision hole machining precision in a damping vibration reduction mode. The vibration reduction cutter is of an elastic structure, the static rigidity of the cutter bar is not strong, a large cutter back-off phenomenon exists during cutting, and particularly, the vibration reduction cutter is poor in cutting performance, large in cutting resistance and more obvious in cutter back-off phenomenon aiming at titanium alloy and high-temperature alloy parts. The larger the cutting depth is, the larger the cutting force is, and the cutter back-off amount is correspondingly increased.
As shown in FIG. 1, the feed amount is a0When cutting, the cutter bar deforms to generate cutter back-off, and the cutter back-off amount is w0The actual removal margin is a01I.e. w0＝a0－a01And the cutter rebounds to a feed point after cutting, so that the cutter back-off amount is required to be found out when different cutting depths are processed, the efficiency is low, and the size is extremely easy to be out of tolerance. Generally, in order to better ensure the dimensional accuracy, the cutting needs to be continuously carried out for 3 to 5 times to process the hole to the final size, the cutting amount of the last two times and the last three times may only be 0.005mm to 0.01mm, the cutting depth is far smaller than the round corner of the tool nose, the cutting containing angle is too small to generate radial cutting force, and meanwhile, the cutting edge is easy to wear quickly, the cutting is not stable, and the processing accuracy and the surface quality of a precise hole are influencedAmount of the compound (A).
Disclosure of Invention
The invention provides a method and a casing for automatically compensating and cutting precise deep holes by a vibration-damping cutter, which aim to solve the technical problems of unstable cutter yield, low repeated compensation machining efficiency, quick abrasion of a cutting edge and poor dimensional stability during the machining of the vibration-damping boring cutter.
The technical scheme adopted by the invention is as follows:
a vibration reduction cutter automatic compensation cutting precise deep hole processing method is used for processing a titanium alloy or high-temperature alloy casing precise deep hole, the processing allowance reserved for processing the precise deep hole is 3a, vibration reduction boring cutters are used for processing the precise deep hole to a final size in a three-time feeding mode by adopting the same linear speed and feeding parameters, and the three-time feeding processing comprises first feeding, second feeding and third feeding;
the three-time feed processing comprises the following steps:
s1: the first feed processing is carried out, and the feed amount a1 of the first feed is
S2: measuring the aperture size of the precise deep hole, calculating the residual machining allowance A, and performing secondary feed machining, wherein the feed amount a2 of the secondary feed is a 2-A-a 1;
s3: and measuring the aperture size of the precise deep hole, calculating the final machining allowance B, and performing third-time feed machining, wherein the feed amount a3 of the third-time feed is B.
Further, the length-diameter ratio of the cutter bar of the vibration-damping boring cutter is more than 7.
Furthermore, the feed amount a1 of the first time of feed is 1/2-3/4 of the corner fillet radius R of the vibration reduction boring cutter; and/or the feed amount a2 of the secondary feed is 1/2-3/4 of the tool nose fillet radius R of the vibration reduction boring tool; and/or the feed amount a3 of the third time of feed is 1/2-3/4 of the corner fillet radius R of the vibration reduction boring cutter.
Further, in step S1, the relief amount w1 of the first cutting feed process is w1 ═ kxX a1, wherein: k is a radical ofxFor correction of the coefficient, a1 is the feed of the first feedAn amount; the actual removal amount Y1 of the first feed processing was Y1 ═ a1 to w 1.
Further, in step S2, the remaining machining allowance a is 3 a-Y1; the actual cutting amount of the second feed machining is a2+ w 1; the cutter relieving amount w2 of the second time of cutter feeding processing is w2 ═ kxX (a2+ w 1); the actual removal amount Y2 of the second feed processing is Y2 ═ a2+ w 1-w 2.
Further, in step S3, the final machining allowance B is 3 a-Y1-Y2; the actual cut amount of the third feed machining is a3+ w 2; the cutter relieving amount w3 of the third feed processing is w3 ═ kxX (a3+ w 2); the actual removal amount Y3 of the third feed processing was Y3 ═ a3+ w 2-w 3.
Further, a machining error Δ a exists between the actual removal amount Y3 of the third plunge cutting and the machining allowance B, and the machining error Δ a is 0.0009 or less.
Furthermore, the radius R of the tool nose fillet of the vibration-damping boring tool adopted by the three times of feeding processing is 0.15 mm-0.25 mm.
According to another aspect of the invention, the casing prepared by the machining method for automatically compensating and cutting the precise deep hole by using the vibration reduction tool is also provided.
The invention has the following beneficial effects:
the machining method of the vibration reduction cutter for automatically compensating and cutting the precise deep hole is used for machining the precise deep hole of the titanium alloy or the high-temperature alloy casing, the machining allowance 3a for finish machining is selected to be fed for three times, and the same linear speed and feed parameters are adopted, namely the feed amount of each feed is close to a, so that the cutter yield of each cutting is basically consistent. Because the vibration reduction cutter is of an elastic structure, the cutter relieving amount and the rebound amount generated by each time of feeding are basically consistent during finish machining, and therefore the actual cutting amount of the second feeding and the third feeding is the sum of the feeding amount and the rebound amount of the last feeding. The second cutting feed amount a2 is selected as A-a 1, which is to eliminate the cutter yield w1 generated by the first cutting feed to a certain extent, and make the actual cutting amount of the second cutting feed substantially consistent with the actual cutting amount of the third cutting feed by utilizing the mutual offset compensation of the cutter yields generated by each cutting feed, so as to achieve the purpose of infinitely small difference between the two cutting yields, and during the final third cutting, the cutter yield rebound amount of the second cutting and the third cutting yield can be substantially offset, so that the actual removal amount of the third machining is ensured to be substantially consistent with the measured final machining allowance B, and the cutter yield error is eliminated to the greatest extent, so as to obtain higher dimensional accuracy. Therefore, the vibration reduction cutter is machined by adopting the cutting feed strategy, the cutter relieving rule of each time of feeding is utilized to automatically compensate and eliminate cutter relieving errors, cutter relieving amount when different cutting feeds are groped is avoided, an operator does not need to repeatedly and cautiously feed, the operation method is simpler and more convenient, and the machining efficiency is improved. Meanwhile, the size out-of-tolerance caused by the fact that the cutter back-off amount is not controlled repeatedly is avoided, the cutting edge is prevented from being worn quickly when the cutter nose fillet of the vibration reduction boring cutter is far smaller than the cutter back-off amount, the cutting stability is better, and the machining precision and the surface quality of the precision hole are improved. The method for automatically compensating and cutting the precise deep hole by the vibration reduction cutter has wide application range, can be applied to the condition that other cutters with poor rigidity process the precise hole, improves the processing precision and the surface quality of the precise deep hole, and prolongs the service life of the cutter.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of a prior art vibration reducing tool cutting back-off of the present invention;
FIG. 2 is a schematic illustration of a three-pass process of a vibration reducing tool according to a preferred embodiment of the present invention;
FIG. 3 shows the machining errors Δ a and k according to the preferred embodiment of the present inventionXThe relationship is a graph.
The reference numbers illustrate:
1. roughly machining the surface; 2. and (6) finishing the surface.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
FIG. 1 is a schematic view of a prior art vibration reducing tool cutting back-off of the present invention; FIG. 2 is a schematic view of a three-pass process of the vibration reducing tool of the preferred embodiment of the present invention; FIG. 3 shows the machining errors Δ a and k according to the preferred embodiment of the present inventionXThe relationship is a graph.
As shown in fig. 2, the method for machining a precise deep hole by using a vibration-damping tool to automatically compensate and cut a precise deep hole according to the present embodiment is used for machining a precise deep hole of a titanium alloy or a high-temperature alloy casing, wherein a machining allowance reserved for machining the precise deep hole is 3a, the vibration-damping boring tool is used for performing three-time feed machining to a final size by using the same linear velocity and feeding parameters, and the three-time feed machining includes a first feed, a second feed and a third feed;
the three-time feed processing comprises the following steps:
s1: the first feed processing is carried out, and the feed amount a1 of the first feed is
S2: measuring the aperture size of the precise deep hole, calculating the residual machining allowance A, and performing secondary feed machining, wherein the feed amount a2 of the secondary feed is a 2-A-a 1;
s3: and measuring the aperture size of the precise deep hole, calculating the residual machining allowance B, and performing third-time feed machining, wherein the feed amount a3 of the third-time feed is B.
The machining method of the vibration reduction cutter for automatically compensating and cutting the precise deep hole is used for machining the precise deep hole of the titanium alloy or the high-temperature alloy casing, the machining allowance 3a for finish machining is selected to be fed for three times, and the same linear speed and feed parameters are adopted, namely the feed amount of each feed is close to a, so that the cutter yield of each cutting is basically consistent. Because the vibration reduction cutter is of an elastic structure, the cutter relieving amount and the rebound amount generated by each time of feeding are basically consistent during finish machining, and therefore the actual cutting amount of the second feeding and the third feeding is the sum of the feeding amount and the rebound amount of the last feeding. The A-a 1 is selected as the second cutting feed amount a2, so that the cutter back feed amount w1 generated by the first cutting feed is eliminated to a certain extent, the cutter back feed amount generated by each cutting feed is mutually offset and compensated, the actual cutting feed amount of the second cutting feed is basically consistent with the actual cutting feed amount of the third cutting feed, the purpose that the difference value of the two cutting cutter back feed amounts is infinitely small is achieved, the cutter back feed amount of the second cutting feed and the third cutting cutter back feed amount can be basically mutually offset during the final third cutting, the actual removal amount of the third machining is basically consistent with the measured final machining allowance B, the cutter back feed error is eliminated to the greatest extent, and the higher dimensional accuracy is obtained. Therefore, the vibration reduction cutter is machined by adopting the cutting feed strategy, the cutter relieving rule of each time of feeding is utilized to automatically compensate and eliminate cutter relieving errors, cutter relieving amount when different cutting feeds are groped is avoided, an operator does not need to repeatedly and cautiously feed, the operation method is simpler and more convenient, and the machining efficiency is improved. Meanwhile, the size out-of-tolerance caused by the fact that the cutter back-off amount is not controlled repeatedly is avoided, the cutting edge is prevented from being worn quickly when the cutter front fillet of the vibration-damping boring cutter is far smaller than the cutter nose fillet, the cutting stability is better, and the machining precision and the surface quality of the precision hole are improved. The machining method for automatically compensating and cutting the precise deep hole by the vibration reduction cutter has wide application range, can also be applied to the condition that other cutters with poor rigidity machine the precise hole, improves the machining precision and the surface quality of the precise hole, and prolongs the service life of the cutter.
In the embodiment, the length-diameter ratio of the cutter bar of the vibration-damping boring cutter is greater than 7. Based on the mechanical characteristics of a titanium alloy or high-temperature alloy casing, the structural interference and suspension extension of parts need to be avoided in the machining process of the vibration-damping cutter, and the length-diameter ratio of the cutter bar of the vibration-damping boring cutter is designed to be larger than 7 so as to meet the requirement of machining precise deep holes.
In the embodiment, the feed amount a1 of the first time of feed is 1/2-3/4 of the corner fillet radius R of the vibration reduction boring cutter. And/or the feed amount a2 of the secondary feed is 1/2-3/4 of the tool nose fillet radius R of the vibration reduction boring tool. And/or the feed amount a3 of the third time of feed is 1/2-3/4 of the corner fillet radius R of the vibration reduction boring cutter. When the precise deep hole is finely machined, in order to guarantee the cutting stability and the service life of the vibration reduction tool, 1/2-3/4 of the radius R of a tool nose fillet is generally selected as the optimal feed amount, and meanwhile, in order to reduce cutting vibration, the cutting force is reduced as much as possible, the small feed amount is selected within a reasonable range, and the sharpness of the vibration reduction tool is improved. The tool nose fillet of the vibration-damping boring tool generally adopts R0.2, and the tool feed amount is generally about 0.1 mm. The cutter has the advantages that the phenomenon that the cutting edge loses efficacy due to rapid abrasion of the cutting edge to influence machining precision and surface quality due to extrusion friction of the cutting edge and a machining surface due to too small feed amount is avoided, the rapid abrasion of the cutting edge is avoided, the service life of the cutter is prolonged, and the cost is reduced.
As shown in fig. 2, in the present embodiment, the cutting back amount w1 of the first cutting process in step S1 is w1 ═ kxX a1, wherein: k is a radical ofxTo correct the coefficient, a1 is the feed amount of the first feed. The actual removal amount Y1 of the first feed processing was Y1 ═ a1 to w 1. K represents the above w1xXa 1 was obtained based on the radial cutting force F: f ═ 54 × ap 0.9×f0.75×KpWherein: a ispFor cutting depth, f is the feed per revolution of the vibration-damping boring tool, i.e. the feed parameter, KpThe correction coefficient is related to the mechanical property of the workpiece material and the geometric parameter of the cutter. According to the above relation, in the precision deep hole finishing, the cutting depth apThe radial cutting force F is small, and when the material of the part to be processed, the geometric parameters of the vibration reduction cutter and the feed per revolution are not changed, the radial cutting force F and the cutting depth apApproximately proportional to each other, and the vibration-damping boring cutter is of an elastic structure, and when the radial cutting force F is not large, the cutting yield w ispApproximately proportional to the radial cutting force F, thereby obtaining the cutter back-off amount wpAnd cutting depth apApproximately proportional, i.e. wp＝kX×ap，kXIs a correction factor. Therefore, the relief amount w1 of the first feed processing is approximately in direct proportion to the feed amount a1 of the first feed.
As shown in fig. 2, in the present embodiment, in step S2, the remaining machining allowance a is 3 a-Y1. The actual cut amount in the second plunge cutting is a2+ w 1. The cutter relieving amount w2 of the second time of cutter feeding processing is w2 ═ kxX (a2+ w 1). The actual removal amount Y2 of the second feed processing is Y2 ═ a2+ w 1-w 2. On the upper partThe residual machining allowance a is 3 a-Y1, the cutting is rebounded after the first cutting, a1 is a, and the cutting feed amount a2 of the second cutting is a-a 1, a-a is 3 a-Y1-a is 3 a- (a-w 1) -a is a + w 1. The actual cut amount a2+ w1 of the second cutting pass is a + w1+ w1 is a +2w 1. The cutter yield w2 ═ kx×(a2+w1)＝kxX (a +2w 1). The actual removal amount Y2 of the second feed processing is Y2 ═ a2+ w 1-w 2 ═ a +2w 1-w 2.
As shown in fig. 2, in the present embodiment, in step S3, the final machining allowance B is 3 a-Y1-Y2. The actual cut amount in the third plunge cutting is a3+ w 2. The cutter relieving amount w3 of the third feed processing is w3 ═ kxX (a3+ w 2). The actual removal amount Y3 of the third feed processing was Y3 ═ a3+ w 2-w 3. The final machining allowance B is B-3 a-Y1-Y2, B-a 3-3 a-Y1-Y2-3 a- (a-w 1) - (a +2w 1-w 2) -a + w 2-w 1. And the actual cutting amount a3+ w2 of the third feed machining is a +2w 2-w 1 because the cutter rebounds after the second feed machining. The cutter yield w3 ═ k in the third feeding processx×(a3 +w2)＝kxX (a +2w 2-w 1). The actual removal amount Y3 is Y3 ═ a3+ w 2-w 3 ═ a +2w 2-w 1-w 3.
In this embodiment, a machining error Δ a exists between the actual removal amount Y3 of the third feed machining and the machining allowance B. Δ a-Y3 ═ k (a + w 2-w 1) - (a +2w 2-w 1-w 3) ═ w 3-w 2 ═ kx 2×(4kx-1) × a. As shown in fig. 3, assuming that a is 1, a coordinate curve is established, and Δ a is proportional to kx. When the titanium alloy and high-temperature alloy parts are precisely processed in deep holes, the feeding parameters are moderate, when the cutting feed a is not more than 0.2mm each time, kx is about 0.05-0.15, and delta a is usually-0.0018-0.0004. The finish machining usually adopts R0.2 tool nose fillets, in order to ensure the surface quality, the service life of a tool and the cutting stability, the cutting feed amount a can be generally only selected to be about 0.1mm each time, and the precision deep hole machining error delta a can be obtained to be-0.0002 to-0.0009. Finally, the maximum machining error of the precise deep hole is determined to be 0.0009 and can be ignored. The measuring method is unchanged in the machining process, the measuring error is small, the measuring precision and the boring cutter feed error are comprehensively considered, and the machining precision of the precise deep hole size can reach 0.002.
In the embodiment, the radius R of the corner fillet is 0.15-0.25 mm.
As shown in fig. 2, the method for machining the precise deep hole by the vibration reduction tool with automatic compensation comprises the following specific steps:
taking the precision deep hole phi 50(0, +0.01) processing of a certain type titanium alloy casing as an example, the cutter bar diameter of the vibration-damping boring cutter is less than phi 40, the overhanging length is close to 310mm, the length-diameter ratio of the cutter bar is greater than 7, and the vibration-damping cutter is adopted for processing. The linear velocity Vc is 50m/min, the feed amount f per revolution is 0.025mm, the fillet R of the finish machining tool nose is 0.2, and the average feed amount per time is about 0.1 mm.
S1, performing semi-finishing by using a common standard boring cutter, reserving a finishing allowance of about 0.3mm for the precise deep hole, wherein the finishing allowance is approximately close to 0.3mm, measuring to obtain the actual machining allowance of the hole of 0.27mm, performing finishing by using a vibration reduction boring cutter, feeding for three times, and feeding the first time by a feeding amount of 0.09mm which is one third of the actual machining allowance;
s2, measuring the aperture of the precise deep hole, calculating the residual machining allowance A to be 0.19mm, and feeding the vibration-damping boring cutter for the second time to be 0.10mm, namely 0.19-0.09 mm is 0.10 mm;
and S3, measuring the aperture of the precise deep hole, calculating the final machining allowance B to be 0.092mm, feeding the vibration-damping boring cutter for the third time to be 0.092mm, and machining to the final size to obtain a finish machining surface 2. The machining precision of the obtained precise deep hole size can reach within 0.002.
According to another aspect of the invention, the casing prepared by the machining method for automatically compensating and cutting the precise deep hole by using the vibration reduction tool is also provided. The processing precision of the precise deep hole size of the case made of the titanium alloy or the high-temperature alloy obtained by the method for automatically compensating and cutting the precise deep hole by the vibration reduction cutter can reach within 0.002, and the design requirement of the case is met.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A vibration reduction cutter automatic compensation cutting precise deep hole processing method is used for processing a titanium alloy or high-temperature alloy casing precise deep hole, and is characterized in that the processing allowance reserved for processing the precise deep hole is 3a, the vibration reduction boring cutter is used for processing the precise deep hole to a final size by three times of feed according to the same linear speed and feeding parameters, and the three times of feed processing comprises first feed, second feed and third feed;
the three-time feed processing comprises the following steps:
s1: performing a first feed process, wherein the feed amount a1 of the first feed process is
S2: measuring the aperture size of the precise deep hole, calculating the residual machining allowance A, and performing secondary feed machining, wherein the feed amount a2 of the secondary feed is a 2-A-a 1;
s3: and measuring the aperture size of the precise deep hole, calculating the final machining allowance B, and performing third-time feed machining, wherein the feed amount a3 of the third-time feed machining is B.
2. The method for machining a precision deep hole by automatic compensation cutting of a vibration damping tool according to claim 1,
the length-diameter ratio of the cutter bar of the vibration-damping boring cutter is larger than 7.
3. The method for machining a precision deep hole by automatic compensation cutting of a vibration damping tool according to claim 1,
the feed amount a1 of the first time of feed is 1/2-3/4 of the corner fillet radius R of the vibration reduction boring cutter; and/or
The feed amount a2 of the secondary feed is 1/2-3/4 of the corner fillet radius R of the vibration reduction boring cutter; and/or
The feed amount a3 of the third time of feed is 1/2-3/4 of the corner fillet radius R of the vibration reduction boring cutter.
4. The method for machining a precision deep hole by automatic compensation cutting of a vibration damping tool according to claim 1,
in step S1, the relief amount w1 of the first plunge cut is w1 ═ kxX a1, wherein: k is a radical ofxFor the correction factor, a1 is the feed amount of the first feed;
the actual removal amount Y1 of the first feed processing was Y1 ═ a1 to w 1.
5. The method for machining a precision deep hole by automatic compensation cutting of a vibration damping tool according to claim 4,
in step S2, the remaining machining allowance a is a — 3 a-Y1;
the actual cutting amount of the second feed machining is a2+ w 1;
the cutter relieving amount w2 of the second time of cutter feeding processing is w2 ═ kx×(a2+w1)；
The actual removal amount Y2 of the second feed processing is Y2 ═ a2+ w 1-w 2.
6. The method for machining a precision deep hole by automatic compensation cutting of a vibration damping tool according to claim 5,
in step S3, the final machining allowance B is 3 a-Y1-Y2;
the actual cutting amount of the third feed machining is a3+ w 2;
the cutter relieving amount w3 of the third feed processing is w3 ═ kx×(a3+w2)；
The actual removal amount Y3 of the third feed processing was Y3 ═ a3+ w 2-w 3.
7. The method for machining a precision deep hole by automatic compensation cutting of a vibration damping tool according to claim 6,
a machining error Δ a exists between the actual removal amount Y3 of the third feed machining and the final machining allowance B;
the machining error Δ a is equal to or less than 0.0009.
8. The method for machining a precision deep hole by automatic compensation cutting of a vibration damping tool according to claim 3,
the radius R of the tool nose fillet of the vibration-damping boring tool adopted for the third feeding processing is 0.15 mm-0.25 mm.
9. A housing obtained by using the vibration damping tool according to any one of claims 1 to 8 in a machining method for automatically compensating and cutting a precise deep hole.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010470998.7A CN111673143B (en) | 2020-05-29 | 2020-05-29 | Method for machining precise deep hole by automatic compensation cutting of vibration reduction tool and casing |
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| CN202010470998.7A CN111673143B (en) | 2020-05-29 | 2020-05-29 | Method for machining precise deep hole by automatic compensation cutting of vibration reduction tool and casing |
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| CN111673143A CN111673143A (en) | 2020-09-18 |
| CN111673143B true CN111673143B (en) | 2021-06-18 |
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