CN103028752A - Processing method for phi 52H7*850 deep hinge pin keyhole at matched position of parts of different materials - Google Patents

Processing method for phi 52H7*850 deep hinge pin keyhole at matched position of parts of different materials Download PDF

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Publication number
CN103028752A
CN103028752A CN2012104934675A CN201210493467A CN103028752A CN 103028752 A CN103028752 A CN 103028752A CN 2012104934675 A CN2012104934675 A CN 2012104934675A CN 201210493467 A CN201210493467 A CN 201210493467A CN 103028752 A CN103028752 A CN 103028752A
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hole
boring
fairlead
processing
depth
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CN103028752B (en
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余来胜
易振明
周红祥
黄槊
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Hubei Sanhuan Forging and Pressing Equipment Co Ltd
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Hubei Sanhuan Forging and Pressing Equipment Co Ltd
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Abstract

The invention relates to a machining process, in particular to a processing method for a phi 52H7*850 deep hinge pin keyhole at a matched position of parts of different materials. The processing method comprises the following process steps of: (1) performing center drilling; (2) drilling a phi42*150mm process hole; (3) boring the phi42*150mm hole into a phi45H8*100mm hole; (4) drilling a phi45*160mm hole; (5) drilling the phi42*150mm process hole to deepen the process hole to be phi42*260mm in dimension; (6) boring the hole to be phi45H8*250mm in dimension; (7) drilling the hole to be phi45*420mm in dimension; (8) boring the hole to be phi48H6*50mm in dimension; (9) installing a guide sleeve and finely boring the hole to be phi48H6*400mm in dimension; (10) drilling the hole to be phi48*860mm in dimension; (11) boring the hole to be phi51.5H6*850mm in dimension; (12) boring the hole to be phi51.7H6*850mm in dimension; and (13) finely boring the hole to be phi52H7*850mm in dimension. By adopting the front boring and rear supporting gradually deepening processing method, the high-accuracy deep hole processing at the joint of two materials is realized, and the assembly accuracy problem of a large-sized transmission part is solved. The processing method is mainly used for processing the hinge pin keyhole between a large-sized flywheel and a main shaft.

Description

The processing method in different materials part cooperation place Φ 52H7 * 850 dark pin key holes
Technical field
The present invention relates to mechanical processing technique, be specially the processing method in different materials part cooperation place Φ 52H7 * 850 dark pin key holes.
Background technology
Connection between large-scale flywheel and the main shaft generally adopt spline or multiple tooth flat tooth flat key mode, but part is too large, and working (machining) efficiency is low, and machining accuracy is difficult to be guaranteed, more is difficult to reach the precision of designing requirement after the assembling.
Large-scale flywheel (generally adopting ZG270-500) and main shaft (generally adopting 35CrMoV) are assembled into an integral body, in both cooperation place take a plurality of bearing pins as the key transmitting torque, can solve the assembly precision problem of large-scale driving member, but the processing problems of the super dark precision holes of different materials combination cooperation place is again a technical barrier, in the national standard of tolerance fit, stipulated draw ratio (L/D) less than 3 o'clock basic hole system fit tolerance standards, but for draw ratio greater than 3(L/D 〉=3) all holes cooperate and do not stipulate.Its quality of fit is difficult to reach the 7-8 level.Particularly: one of above-mentioned two kinds of compounding ingredients are cast steel ZG270-500, HB142, σ b=500MPa, σ s=270MPa; Another material is the alloy structure steel forgings 35CrMoV through modifier treatment, HB300, σ b=1080MPa, σ s=930MPa; Both materials are different with the blank form, and its mechanical performance parameter great disparity is very large, and the machinability in hole has a long way to go.The processing difficult problem of the super dark precision holes of different materials sub-assembly cooperation place has herein affected the application prospect of this structure.
Summary of the invention
Purpose of the present invention is exactly the problem that will solve bi-material sub-assembly cooperation place high accuracy superdeep holes processing difficulties, and the processing method in different materials part cooperation place Φ 52H7 * 850 dark pin key holes is provided.
Concrete scheme of the present invention is: the processing method in different materials part cooperation place Φ 52H7 * 850 dark pin key holes; It is characterized in that: comprise following processing step:
(1) at the Working position drill centers of φ 52H7, cutting data: rotation speed n=300r/min, axial feed F=10mm/min;
(2) bore fabrication hole φ 42 * 150mm, cutting data: rotation speed n=120r/min, axial feed F=9mm/min;
(3) bore hole is carried out to the dark 100mm of size φ 45H8, roughness Ra=3.2, cutting data: rotation speed n=130r/min, axial feed F=9mm/min, the depth of cut t=0.1mm of last two cuttves in φ 42mm hole;
(4) the flower pilot hole is bored as φ 45mm in φ 45H7 * 100mm hole; Upper cooling fluid is bored flower along φ 45H7 hole feed with φ 45mm first, revises fabrication hole φ 42mm skew, and slowly drilling is until the hole is sharp, and the degree of depth must surpass 160mm: bore when spending point to contact and cut with the foramen primum point, get n=80r/min, F=3mm/min; Other processing sections, n=80r/min, F=5mm/min;
(5) upper cooling fluid is bored fabrication hole φ 42mm and is added and be deep to 260mm; Cutting data: rotation speed n=80r/min, axial feed F=15mm/min;
(6) with the double-blade boring cutter of 75 ° of tool cutting edge angles, bore hole is to the dark 250mm of size φ 45H7, cutting data: n=150r/min, F=18mm/min;
The φ 45H7 that (7) will process * 250mm hole is as the pilot hole that bores flower, upper cooling fluid, the dark 420mm of boring φ 45mm, bore flower with φ 45mm first and revise fabrication hole φ 42mm skew, slowly cutting is until the hole is sharp, degree of depth 420mm: bore when spending point to contact and cut with the foramen primum point, get n=60r/min, F=3mm/min; Other processing sections, n=60r/min, F=6mm/min;
(8) with the double-blade boring cutter of 75 ° of tool cutting edge angles, bore diameter is to size φ 48H6, and roughness Ra=3.2 are deep to 50mm, at the outside suit of Modulations tools joint fairlead; Cutting data: n=80r/min, F=8mm/min, combination boring bar active length 320mm;
(9) at the outside suit of Modulations tools joint fairlead, the fairlead internal diameter is φ 40H6, and external diameter is φ 48f5, the chip removal of limit feed cutting edge withdrawing, step by step right boring hole φ 48H6, deeply 400mm; The front 200mm degree of depth, there is the space that enough takes iron filings in the hole, not withdrawing processing; The rear 200mm degree of depth, the hole takes the space of iron filings less in, limit feed cutting, limit withdrawing chip removal; Cutting data: n=80r/min, F=18mm/min;
(10) will process φ 48H6 * 400mm hole as boring the flower pilot hole, upper cooling fluid, boring φ 48 * 860mm; Bore flower with φ 48mm first and revise fabrication hole φ 45mm skew, slowly until the hole is sharp; The degree of depth is near 15mm length range before and after the 420mm, control rotating speed and the amount of feeding, n=60r/min, F=6mm/min;
In the 15mm length range of degree of depth 420mm front and back, bore and spend point and foramen primum point to contact when being cut to the end correction F=3mm/min in the said process; Of short duration empty cutter cutting or withdraw from processing when hearing the abnormal vibrations of cutting or sound;
(11) with 75 ° of short double-blade boring cutters, bore hole is to size φ 51.5H6, roughness Ra=3.2, be deep to 50mm, at the outside suit of Modulations tools joint fairlead, the fairlead internal diameter is φ 40H6, and external diameter is φ 51.5f5, then change the double-blade boring cutter of 75 ° of long tool cutting edge angles, put in place by the whole hole depths of φ 51.5H6 boring; Cutting data: n=60r/min, F=8mm/min;
(12) with 75 ° of short double-blade boring cutters, bore hole is to size φ 51.7H6, roughness Ra=3.2, be deep to 50mm, at the outside suit of Modulations tools joint fairlead, the fairlead internal diameter is φ 40H6, and external diameter is φ 51.7f5, then change the double-blade boring cutter of 75 ° of long tool cutting edge angles, put in place by the whole hole depths of φ 51.7H7 boring; Cutting data: n=50r/min, F=3mm/min;
(13) right boring hole dimension to the φ 52H7 degree of depth puts in place; With 75 ° of double-blade boring cutters, and at the outside suit of Modulations tools joint fairlead, the fairlead internal diameter is φ 40H6, and external diameter is φ 52f5, and tool setting gauge is adjusted the symmetrical φ of assurance of point of a knife 52H7 diameter value, and the difference of control point of a knife external diameter and fairlead external diameter is 0.02-0.03mm; Remove the burr foreign material of fairlead, avoid the workpiece of burning; The import double-blade boring cutter of 75 ° of tool cutting edge angles, the boring φ 52H8 degree of depth puts cutting data in place: n=70r/min, F=6mm/min.
Boring cutter described in the present invention has basic handle, and the Modulations tools extension bar that docks with basic handle is with the Modulations tools joint that the Modulations tools extension bar docks foremost, the cutter head that docks with the Modulations tools joint; The described fairlead that is sleeved on the Modulations tools joint is to adopt spheroidal graphite cast-iron to make, and its outer wall has at least circumferential oil-way of twice, and at least four roads chip area of axially ventilating; The two ends of fairlead are provided with the conical surface.
The length of boring bar described in the present invention is that the degree of depth according to bore hole progressively lengthens, and certain boring depth correspondingly is equipped with the shortest Modulations tools extension bar.
In the process, in time blow the slag deslagging described in the present invention, uninterruptedly lubricated fairlead.
The last right boring in per step described in the present invention, every cutter depth of cut is no more than 0.10-0.15mm, and the point of a knife that the round R of employing is 0.8mm pushes the smoothing cutting.
Design principle of the present invention is: optimize technology, tool bearing and the hole deviation correcting technology of reliable cutting under Turable cutting cutting-tool engineering, knife bar damping and the knife bar minimum degree of disturbing, Optimized Matching of cutting parameter etc., the above-mentioned multiple process technology of optimum organization, it is theoretical to form the complete deep hole machining of a cover.Have following main points:
1. process accurately centre bore and guarantee the constant of process coordinate figure.
2. the length of indexable boring bar is deepened and progressively lengthening with the degree of depth of institute's boring precision holes, and the rigidity of knife bar can progressively descend.Therefore the diameter of the used knife bar of each work step and length are progressively overstriking, lengthening.
3. the precision in the hole that processes of last work step is the cutter of next work step and the benchmark of cutter fairlead.Fairlead and cutter precision-fit are integral, and with cutter rotate, feeding.High-precision fairlead adopts the spheroidal graphite cast-iron manufacturing, and is designed with guiding and lubricated key element.
4. the difference of indexable boring cutter point of a knife bus height and fairlead bus height is that 0.01-0.015mm(is that both external diameters are poor for 0.02-0.03mm), can accurately guarantee by the position that tool setting gauge is adjusted blade.During right boring, use " front right boring, rear support " pattern, that is: the precision holes in the new boring of front end of boring cutter is the accurate supporting benchmark of adjacent fairlead thereafter; Because fairlead has continuous accurate supporting benchmark supporting boring cutter and with the boring cutter axial feed motion with rotatablely move, guarantees that also boring cutter does axial feed motion and rotatablely move along accurate axis.
5. select indexable boring cutter to adopt suitable feed speed, the suitable depth of cut and suitable rotating speed, three elements change with the change in depth in hole.
The present invention designs ingenious, simple to operate, machining accuracy is high, the processing method of propping up after the boring before adopting, progressively deepening, realized the high-precision deep hole machining in bi-material junction, making large-scale flywheel and main shaft adopt a plurality of bearing pins is that driving key is achieved, and has solved the assembly precision problem of large-scale driving member, is mainly used in the bearing pin keyhole processing between large-scale flywheel and the main shaft.
Description of drawings
Fig. 1 is boring cutter deep hole machining schematic diagram;
Fig. 2 is the front view of fairlead;
Fig. 3 is the top view of fairlead.
Among the figure: 1-cutter head, 2-fairlead, 3-Modulations tools extension bar, 4-basis handle, 5-Modulations tools joint, 6-main shaft, 7-flywheel, the 8-chip area of axially ventilating, the wide oil-way of 9-, the narrow oil-way of 10-.
The specific embodiment
Referring to Fig. 1, the inventive method is used for machining large flywheel 7(ZG270-500) and the Φ 52H7 of main shaft 6 cooperation places * 850 dark pin key holes, the concrete technology step is as follows:
(1) at the Working position drill centers of φ 52H7, cutting data: rotation speed n=300r/min, axial feed F=10mm/min;
(2) bore fabrication hole φ 42 * 150mm, cutting data: rotation speed n=120r/min, axial feed F=9mm/min;
(3) bore hole is carried out to the dark 100mm of size φ 45H8, roughness Ra=3.2, cutting data: rotation speed n=130r/min, axial feed F=9mm/min, the depth of cut t=0.1mm of last two cuttves in φ 42mm hole;
(4) the flower pilot hole is bored as φ 45mm in φ 45H7 * 100mm hole; Upper cooling fluid is bored flower along φ 45H7 hole feed with φ 45mm first, revises fabrication hole φ 42mm skew, and slowly drilling is until the hole is sharp, and the degree of depth must surpass 160mm: bore when spending point to contact and cut with the foramen primum point, get n=80r/min, F=3mm/min; Other processing sections, n=80r/min, F=5mm/min;
(5) upper cooling fluid is bored fabrication hole φ 42mm and is added and be deep to 260mm; Cutting data: rotation speed n=80r/min, axial feed F=15mm/min;
(6) with the double-blade boring cutter of 75 ° of tool cutting edge angles, bore hole is to the dark 250mm of size φ 45H7, cutting data: n=150r/min, F=18mm/min;
The φ 45H7 that (7) will process * 250mm hole is as the pilot hole that bores flower, upper cooling fluid, the dark 420mm of boring φ 45mm, bore flower with φ 45mm first and revise fabrication hole φ 42mm skew, slowly cutting is until the hole is sharp, degree of depth 420mm: bore when spending point to contact and cut with the foramen primum point, get n=60r/min, F=3mm/min; Other processing sections, n=60r/min, F=6mm/min;
(8) with the double-blade boring cutter of 75 ° of tool cutting edge angles, bore diameter is to size φ 48H6, and roughness Ra=3.2 are deep to 50mm, at Modulations tools joint 5 outside suit fairleads 2; Cutting data: n=80r/min, F=8mm/min, combination boring bar active length 320mm;
(9) at Modulations tools joint 5 outside suit fairleads 2, fairlead 2 internal diameters are φ 40H6, and external diameter is φ 48f5, the chip removal of limit feed cutting edge withdrawing, step by step right boring hole φ 48H6, deeply 400mm; The front 200mm degree of depth, there is the space that enough takes iron filings in the hole, not withdrawing processing; The rear 200mm degree of depth, the hole takes the space of iron filings less in, limit feed cutting, limit withdrawing chip removal; Cutting data: n=80r/min, F=18mm/min;
(10) will process φ 48H6 * 400mm hole as boring the flower pilot hole, upper cooling fluid, boring φ 48 * 860mm; Bore flower with φ 48mm first and revise fabrication hole φ 45mm skew, slowly until the hole is sharp; The degree of depth is near 15mm length range before and after the 420mm, control rotating speed and the amount of feeding, n=60r/min, F=6mm/min;
In the 15mm length range of degree of depth 420mm front and back, bore and spend point and foramen primum point to contact when being cut to the end correction F=3mm/min in the said process; Of short duration empty cutter cutting or withdraw from processing when hearing the abnormal vibrations of cutting or sound;
(11) with 75 ° of short double-blade boring cutters, bore hole is to size φ 51.5H6, roughness Ra=3.2, be deep to 50mm, at Modulations tools joint 5 outside suit fairleads 2, fairlead 2 internal diameters are φ 40H6, and external diameter is φ 51.5f5, then change the double-blade boring cutter of 75 ° of long tool cutting edge angles, put in place by the whole hole depths of φ 51.5H6 boring; Cutting data: n=60r/min, F=8mm/min;
(12) with 75 ° of short double-blade boring cutters, bore hole is to size φ 51.7H6, roughness Ra=3.2, be deep to 50mm, at Modulations tools joint 5 outside suit fairleads 2, fairlead 2 internal diameters are φ 40H6, and external diameter is φ 51.7f5, then change the double-blade boring cutter of 75 ° of long tool cutting edge angles, put in place by the whole hole depths of φ 51.7H7 boring; Cutting data: n=50r/min, F=3mm/min;
(13) right boring hole dimension to the φ 52H7 degree of depth puts in place; With 75 ° of double-blade boring cutters, and at Modulations tools joint 5 outside suit fairleads 2, fairlead 2 internal diameters are φ 40H6, and external diameter is φ 52f5, tool setting gauge is adjusted the symmetrical φ of assurance of point of a knife 52H7 diameter value, and the difference of control point of a knife external diameter and fairlead external diameter is 0.02-0.03mm; Remove the burr foreign material of fairlead 2, avoid the workpiece of burning; The import double-blade boring cutter of 75 ° of tool cutting edge angles, the boring φ 52H8 degree of depth puts cutting data in place: n=70r/min, F=6mm/min.
Boring cutter described in the present embodiment, referring to Fig. 1, it has basic handle 4, and the Modulations tools extension bar 3 that docks with basic handle 4 is with the Modulations tools joint 5 that Modulations tools extension bar 3 docks foremost, the cutter head 1 that docks with Modulations tools joint 5; The described fairlead 2 that is sleeved on the Modulations tools joint 5 is to adopt spheroidal graphite cast-iron to be whittled into, and referring to Fig. 2,3, its outer wall has twice peripheral width oil-way 9 and the narrow oil-way 10 of twice, and the six roads chip area 8 of axially ventilating; The two ends of fairlead 2 are designed to the conical surface.
The length of boring bar described in the present embodiment is that the degree of depth according to bore hole progressively lengthens certain boring depth, the shortest Modulations tools extension bar 3 of corresponding outfit, such as boring φ 45H7 * 250mm hole, the effective active length of module combinations knife bar is 330mm, and diameter is φ 40mm; Boring φ 48H6 * 400mm hole, the effective active length of module combinations knife bar is 480mm, diameter is φ 45mm; Boring φ 52H7 * 850mm hole, the effective active length of module combinations knife bar is 880mm, diameter is φ 50mm.It is φ 80mm toolholder section that described basic handle 4 ends also are provided with diameter, the step that hinders processing is arranged and designs to dodge nose end to be processed.
In the present embodiment process, in time blow the slag deslagging, uninterruptedly lubricated fairlead 2.
The right boring of last three work steps in the present embodiment (the 11st, 12,13 work step), every cutter depth of cut is no more than 0.10-0.15mm, and the point of a knife that the round R of employing is 0.8mm pushes the smoothing cutting.

Claims (5)

1. the processing method in dark pin key hole, different materials part cooperation place Φ 52H7 * 850; It is characterized in that: comprise following processing step:
(1) at the Working position drill centers of φ 52H7, cutting data: rotation speed n=300r/min, axial feed F=10mm/min;
(2) bore fabrication hole φ 42 * 150mm, cutting data: rotation speed n=120r/min, axial feed F=9mm/min;
(3) bore hole is carried out to the dark 100mm of size φ 45H8, roughness Ra=3.2, cutting data: rotation speed n=130r/min, axial feed F=9mm/min, the depth of cut t=0.1mm of last two cuttves in φ 42mm hole;
(4) the flower pilot hole is bored as φ 45mm in φ 45H7 * 100mm hole; Upper cooling fluid is bored flower along φ 45H7 hole feed with φ 45mm first, revises fabrication hole φ 42mm skew, and slowly drilling is until the hole is sharp, and the degree of depth must surpass 160mm: bore when spending point to contact and cut with the foramen primum point, get n=80r/min, F=3mm/min; Other processing sections, n=80r/min, F=5mm/min;
(5) upper cooling fluid is bored fabrication hole φ 42mm and is added and be deep to 260mm; Cutting data: rotation speed n=80r/min, axial feed F=15mm/min;
(6) with the double-blade boring cutter of 75 ° of tool cutting edge angles, bore hole is to the dark 250mm of size φ 45H7, cutting data: n=150r/min, F=18mm/min;
The φ 45H7 that (7) will process * 250mm hole is as the pilot hole that bores flower, upper cooling fluid, the dark 420mm of boring φ 45mm, bore flower with φ 45mm first and revise fabrication hole φ 42mm skew, slowly cutting is until the hole is sharp, degree of depth 420mm: bore when spending point to contact and cut with the foramen primum point, get n=60r/min, F=3mm/min; Other processing sections, n=60r/min, F=6mm/min;
(8) with the double-blade boring cutter of 75 ° of tool cutting edge angles, bore diameter is to size φ 48H6, and roughness Ra=3.2 are deep to 50mm, at the outside suit of Modulations tools joint fairlead; Cutting data: n=80r/min, F=8mm/min, combination boring bar active length 320mm;
(9) at the outside suit of Modulations tools joint fairlead, the fairlead internal diameter is φ 40H6, and external diameter is φ 48f5, the chip removal of limit feed cutting edge withdrawing, step by step right boring hole φ 48H6, deeply 400mm; The front 200mm degree of depth, there is the space that enough takes iron filings in the hole, not withdrawing processing; The rear 200mm degree of depth, the hole takes the space of iron filings less in, limit feed cutting, limit withdrawing chip removal; Cutting data: n=80r/min, F=18mm/min;
(10) will process φ 48H6 * 400mm hole as boring the flower pilot hole, upper cooling fluid, boring φ 48 * 860mm; Bore flower with φ 48mm first and revise fabrication hole φ 45mm skew, slowly until the hole is sharp; The degree of depth is near 15mm length range before and after the 420mm, control rotating speed and the amount of feeding, n=60r/min, F=6mm/min;
In the 15mm length range of degree of depth 420mm front and back, bore and spend point and foramen primum point to contact when being cut to the end correction F=3mm/min in the said process; Of short duration empty cutter cutting or withdraw from processing when hearing the abnormal vibrations of cutting or sound;
(11) with 75 ° of short double-blade boring cutters, bore hole is to size φ 51.5H6, roughness Ra=3.2, be deep to 50mm, at the outside suit of Modulations tools joint fairlead, the fairlead internal diameter is φ 40H6, and external diameter is φ 51.5f5, then change the double-blade boring cutter of 75 ° of long tool cutting edge angles, put in place by the whole hole depths of φ 51.5H6 boring; Cutting data: n=60r/min, F=8mm/min;
(12) with 75 ° of short double-blade boring cutters, bore hole is to size φ 51.7H6, roughness Ra=3.2, be deep to 50mm, at the outside suit of Modulations tools joint fairlead, the fairlead internal diameter is φ 40H6, and external diameter is φ 51.7f5, then change the double-blade boring cutter of 75 ° of long tool cutting edge angles, put in place by the whole hole depths of φ 51.7H7 boring; Cutting data: n=50r/min, F=3mm/min;
(13) right boring hole dimension to the φ 52H7 degree of depth puts in place; With 75 ° of double-blade boring cutters, and at the outside suit of Modulations tools joint fairlead, the fairlead internal diameter is φ 40H6, and external diameter is φ 52f5, and tool setting gauge is adjusted the symmetrical φ of assurance of point of a knife 52H7 diameter value, and the difference of control point of a knife external diameter and fairlead external diameter is 0.02-0.03mm; Remove the burr foreign material of fairlead, avoid the workpiece of burning; The import double-blade boring cutter of 75 ° of tool cutting edge angles, the boring φ 52H8 degree of depth puts cutting data in place: n=70r/min, F=6mm/min.
2. the processing method in different materials part cooperation place Φ 52H7 according to claim 1 * 850 dark pin key holes, it is characterized in that: described boring cutter, has basic handle, the Modulations tools extension bar that docks with basic handle, with the Modulations tools joint that the Modulations tools extension bar docks foremost, the cutter head that docks with the Modulations tools joint; The described fairlead that is sleeved on the Modulations tools joint is to adopt spheroidal graphite cast-iron to make, and its outer wall has at least circumferential oil-way of twice, and at least four roads chip area of axially ventilating; The two ends of fairlead are provided with the conical surface.
3. according to the processing method in claim 1 or 2 described different materials part cooperation place Φ 52H7 * 850 dark pin key holes, it is characterized in that: the length of described boring bar, be that the degree of depth according to bore hole progressively lengthens, certain boring depth correspondingly is equipped with the shortest Modulations tools extension bar.
4. the processing method in different materials part cooperation place Φ 52H7 according to claim 1 * 850 dark pin key holes is characterized in that: in the process, in time blow the slag deslagging, uninterruptedly lubricated fairlead.
5. the processing method in different materials part cooperation place Φ 52H7 according to claim 1 * 850 dark pin key holes, it is characterized in that: the last right boring in per step, every cutter depth of cut is no more than 0.10-0.15mm, and the point of a knife that the round R of employing is 0.8mm pushes the smoothing cutting.
CN201210493467.5A 2012-11-28 2012-11-28 Processing method for phi 52H7*850 deep hinge pin keyhole at matched position of parts of different materials Expired - Fee Related CN103028752B (en)

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CN111347090B (en) * 2020-04-07 2021-08-06 四川源维机械科技有限公司 Method for machining deep holes in a control surface assembly

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