CN103522068A - Special numerical control machine tool for milling end face, drilling center hole and lathing outer circle of thin and long shaft part - Google Patents

Special numerical control machine tool for milling end face, drilling center hole and lathing outer circle of thin and long shaft part Download PDF

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Publication number
CN103522068A
CN103522068A CN201310492623.0A CN201310492623A CN103522068A CN 103522068 A CN103522068 A CN 103522068A CN 201310492623 A CN201310492623 A CN 201310492623A CN 103522068 A CN103522068 A CN 103522068A
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CN
China
Prior art keywords
main
machine tool
spindle box
clamping
milling
Prior art date
Application number
CN201310492623.0A
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Chinese (zh)
Inventor
柏新岩
Original Assignee
沈阳市大鑫数控机械有限责任公司
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Priority to CN201310492623.0A priority Critical patent/CN103522068A/en
Publication of CN103522068A publication Critical patent/CN103522068A/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P23/00Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
    • B23P23/02Machine tools for performing different machining operations

Abstract

The invention relates to a special numerical control machine tool for milling an end face, drilling a center hole and lathing an outer circle of a thin and long piston rod part of a special device in the filed of petroleum, in particular to a special numerical control machine tool for milling an end face, drilling a center hole and lathing an outer circle of a thin and long shaft part. The machine tool comprises a main shaft box, a main shaft box base, a clamping and guiding device, a clamping and feeding device, material supporting frames and a machine tool body. The main shaft box comprises three main shafts, namely the milling main shaft, the drilling main shaft and the lathing main shaft, and the main shaft box is supported on the main shaft box base which is connected with the machine tool body below. The clamping and feeding device is connected with the clamping and guiding device, wherein the clamping and feeding device and the clamping and guiding device clamp a workpiece together and perform workpiece feeding, and the material frames only play a role in supporting parts. According to the numerical control machine tool, three processes, namely milling the end face, drilling the center hole and lathing the outer circle of a thin and long shaft are finished through one-time clamping, the working efficiency is high, clamping, positioning, the feeding amount and the feeding speed are numerically controlled, the machining precision is high, and the rejection rate is low.

Description

Thin and long shafts part end face milling drill centers turning specialized nc machine tool
Technical field
The present invention relates to the end face milling of the elongated piston component of rod category in oil field special equipment, drill centers, turning is processed special-purpose Digit Control Machine Tool, is thin and long shafts part end face milling drill centers turning specialized nc machine tool specifically.
Background technology
While processing the elongated piston component of rod category in oil field special equipment at present, the processing of employing engine lathe, milling, bore, car three process needs twice clamping, during clamping by workman's hand-operated clamping, and adjustment center, first end face milling, rear drill centers, during boring, need manually tool holder to be exited to original operating position, manually rocking-turn tailstock is realized boring, after completing drilling operating, need to stop, by manually unclamping chuck, after being stretched out according to the length of size, part clamps again, and manually tailstock is exited to original operating position, carry out again the cylindrical turning processing to part, whole process expends time in very long, efficiency is low, the yielding precision of workpiece is difficult to guarantee, percent defective is high.
Due to the existence of the problems referred to above, the inventor is studied and analyzes existing manufacturing process, so that it is fast to design process velocity, and the new machine that process is succinct and machining accuracy is high.
Summary of the invention
In order to address the above problem, the inventor has carried out with keen determination, found that the advantage of end face milling drill centres machine tool and two kinds of lathes of Centreless lathe is combined and adopt digital control, main spindle box is set, main spindle box comprises: Milling Process main shaft connects facing cutter, drilling machining spindle connects centre drill, the machining spindle adapter sleeve hull of harnessing an animal to a cart, the machining spindle of wherein harnessing an animal to a cart is hollow structure, there is the through hole passing through for part to be processed, main spindle box is arranged on main spindle box base, by ball, drives main spindle box to move in orbit; Main spindle box base is arranged in machine tool main body, and is driven it is moved in orbit by ball-screw; Clamping and feed arrangement are by Z axis guide rail movement; Comprise a pair of gripper, hydraulic jack two and charging servomotor; Clamping and guider are fixed in machine tool main body, comprise round hub and hydraulic jack one; Machine tool main body, comprises Z axis guide rail, Z axis ball-screw and Z axis servomotor; Two material supporting racks are for support part to be processed; Thereby complete the present invention.
The object of the present invention is to provide following aspect:
(1) thin and long shafts part end face milling drill centers turning specialized nc machine tool, is characterized in that: this Digit Control Machine Tool comprises
Main spindle box 1, main spindle box comprises three main shafts parallel to each other, three main shafts are respectively Milling Process main shaft 11, drilling machining spindle 12 and the machining spindle 13 of harnessing an animal to a cart, three main shafts are horizontally disposed with and in same horizontal plane, wherein, the machining spindle 13 of harnessing an animal to a cart is for hollow structure, and the machining spindle 13 of harnessing an animal to a cart arranges through hole along axis direction, main spindle box bottom surface is provided with X-axis guide-track groove 14
Main spindle box base 2, main spindle box base 2 upper surfaces are provided with the X-axis guide rail 21 matching with X-axis guide-track groove 14; Main spindle box base 2 lower surfaces are provided with main shaft Z axis guide-track groove 23, and main spindle box base front end arranges X-axis servomotor 22, and X-axis servomotor (22) is connected with main spindle box 1 by X-axis ball-screw;
Machine tool main body 7, its top arranges Z axis guide rail 71, the main spindle box base 2 that bottom is provided with main shaft Z axis guide-track groove 23 is arranged on Z axis guide rail 71, and the left end at machine tool main body 7 tops arranges Z axis servomotor 72, and Z axis servomotor 72 is connected with main spindle box base 2 by Z axis ball-screw 73; The right-hand member at machine tool main body 7 tops arranges charging servomotor 43;
Facing cutter 11a, facing cutter is fixed on Milling Process main shaft;
Centre drill 12a, centre drill is fixed on drilling machining spindle;
Cover hull 13a, is provided with through hole along its axis, and cover hull is fixed on harnesses an animal to a cart on machining spindle;
Clamp and feed arrangement 4, be arranged on machine tool main body 7 away from a side of main spindle box 1, clamping and feed arrangement 4 bottom surfaces are provided with feeding Z axis guide-track groove 44, and feeding Z axis guide-track groove 44 matches with the Z axis guide rail 71 of machine tool main body; Clamping and feed arrangement 4 tops arrange a pair of gripper 41, clamping and feed arrangement 4 front ends hydraulic clamp oil cylinder 2 42 are set, and clamping and feed arrangement 4 bottoms are connected with charging servomotor 43 by feed roller ballscrew;
Clamp and guider 3, it is fixed between machine tool main body 7 top lathe headstocks 1 and clamping and feed arrangement 4, and clamping and guider 3 tops arrange round hub 31 and hydraulic clamp oil cylinder 1;
(2) according to the thin and long shafts part end face milling drill centers turning specialized nc machine tool above-mentioned (1) Suo Shu, it is characterized in that, this lathe also comprises two material supporting racks that are arranged side by side along Z-direction 6.
(3) according to the thin and long shafts part end face milling drill centers turning specialized nc machine tool above-mentioned (1) Suo Shu, it is characterized in that, part to be processed 5 passes from outside to inside successively in jaw and circle hub 31, and wherein, the diameter of part to be processed is 27mm-50mm; Part to be processed length is 1000mm-6000mm; Boring part to be processed center-hole diameter is 1.6mm-10mm.
(4) according to the thin and long shafts part end face milling drill centers turning specialized nc machine tool above-mentioned (1) Suo Shu, it is characterized in that, the harness an animal to a cart through hole of machining spindle and the diameter of through hole of cover hull is all greater than 50mm, and the center line of two through holes overlaps with the machining spindle center line of harnessing an animal to a cart.
(5) according to the thin and long shafts part end face milling drill centers turning specialized nc machine tool above-mentioned (1) Suo Shu, it is characterized in that three main shafts on main spindle box work independently in order, the main shaft of not working, in dead ship condition, works alone between each main shaft, does not interfere with each other.
(6) according to the thin and long shafts part end face milling drill centers turning specialized nc machine tool above-mentioned (1) Suo Shu, it is characterized in that, relative position in described main spindle box between three main shafts is constant, and facing cutter outermost end equals or is slightly larger than the distance that centre drill outermost end arrives main spindle box to the distance of main spindle box.
The present invention has following beneficial effect:
(1) slender axles end face milling, drill centers, turning three process clamped one time completes, and operating efficiency is high;
(2) adopt digital control clamping, location and the amount of feeding, feed speed, machining accuracy is high, and percent defective is low;
(3) after end face milling operation completes, main spindle box only needs X axis to move just can to make the centre drill alignment pieces center of next process, completes location, and grinding machine structure design is reasonable, saves the distance of main axle moving, and time availability is high;
(4) only need X axis to move during main shaft orientation, only need Z-axis direction to move during feeding, working line is simple, and failure rate is low is safe and reliable;
(5) hydraulic clamp workpiece and have supporting parts and guiding mechanism fixation workpiece, in process, workpiece is stable, and mismachining tolerance is little.
Accompanying drawing explanation
Fig. 1 illustrates the thin and long shafts part end face milling drill centers turning specialized nc machine tool overall structure schematic diagram of a kind of preferred embodiment according to the present invention;
Fig. 2 illustrates the thin and long shafts part end face milling drill centers turning Special NC Machine Tool Spindle box structure schematic diagram of a kind of preferred embodiment according to the present invention;
Fig. 3 illustrates the thin and long shafts part end face milling drill centers turning specialized nc machine tool three main axle structure schematic diagrames of a kind of preferred embodiment according to the present invention;
Fig. 4 illustrates the turning specialized nc machine tool clamping of thin and long shafts part end face milling drill centers and feed arrangement and clamping and the guider structural representation of a kind of preferred embodiment according to the present invention;
Fig. 5 illustrates the schematic diagram of the thin and long shafts part end face milling drill centers turning specialized nc machine tool overall structure front view of a kind of preferred embodiment according to the present invention;
Fig. 6 illustrates the schematic diagram of the thin and long shafts part end face milling drill centers turning specialized nc machine tool overall structure top view of a kind of preferred embodiment according to the present invention.
Drawing reference numeral explanation:
1-main spindle box
11-Milling Process main shaft
12-drilling machining spindle
The 13-machining spindle of harnessing an animal to a cart
11a-facing cutter
12a-centre drill
13a-overlaps hull
14-X axis rail groove
2-main spindle box base
21-X axis rail
22-X axle servomotor
23-main shaft Z axis guide-track groove
3-clamps and guider
31-circle hub
32-hydraulic clamp oil cylinder one
4-clamps and feed arrangement
41-gripper
42-hydraulic clamp oil cylinder two
43-charging servomotor
44-feeding Z axis guide-track groove
45-feed roller ballscrew
5-part to be processed
6-material supporting rack
7-machine tool main body
71-Z axis rail
72-Z axle servomotor
73-Z axle ball-screw
The specific embodiment
Below by drawings and Examples, the present invention is described in more detail.Leading to these explanations, it is more explicit that the features and advantages of the invention will become.
Here special-purpose word " exemplary " means " as example, embodiment or illustrative ".Here as " exemplary " illustrated any embodiment, needn't be interpreted as being better than or being better than other embodiment.Although the various aspects of embodiment shown in the drawings, unless otherwise indicated, needn't draw accompanying drawing in proportion.
According to of the present invention one preferred embodiment in, as shown in Fig. 1,2 and 4, provide thin and long shafts part end face milling drill centers turning specialized nc machine tool, this Digit Control Machine Tool comprises:
Main spindle box 1, main spindle box base 2, clamping and guider 3, clamping and feed arrangement 4, material supporting rack 6 and machine tool main body 7, wherein main spindle box 1 is arranged on main spindle box base 2, by X-axis guide rail phase 21, connects; Main spindle box base 2 and clamping and feed arrangement 4 are arranged in machine tool main body 7, use Z axis guide rail 71 to be connected; Clamping and guider 3 are fixed in machine tool main body 7, between main spindle box and clamping and feed arrangement;
One preferred embodiment in, as shown in Fig. 2,3, the main spindle box of this Digit Control Machine Tool comprises three main shafts, wherein Milling Process main shaft 11 is connected with facing cutter 11a; Drilling machining spindle 12 is connected with centre drill 12a; The machining spindle 13 of harnessing an animal to a cart is connected with cover hull 13a, and three main shafts are all horizontally disposed with, parallel to each other, and wherein harness an animal to a cart machining spindle 12 and cover hull 13a are hollow structure, have the through hole passing through for part to be processed, and this through-hole diameter are greater than 50mm; There is X-axis guide-track groove 14 main spindle box bottom surface.
One preferred embodiment in, as shown in Fig. 1,2,3, three main shafts of this Digit Control Machine Tool work independently in order, the main shaft of not working, in dead ship condition, does not interfere with each other between each main shaft; Relative position in main spindle box between three main shafts is constant, and facing cutter outermost end equals or is slightly larger than centre drill outermost end to the distance of main spindle box to the distance of main spindle box, after being completed, Milling Process needn't adjust the Z axis position of main spindle box 1, only need the X-axis position of adjusting main spindle box 1 can carry out drilling processing, simplify main axle moving step in process.
One preferred embodiment in, as shown in Figure 2, above the main spindle box base of this Digit Control Machine Tool, being provided with X-axis guide rail 21 matches with X-axis guide-track groove 14, support main spindle box, and there is X-axis servomotor that power is provided, by X-axis ball-screw, conduct, main spindle box can be moved axially along X-axis guide rail 21X; Main spindle box base is arranged in machine tool main body, and main spindle box base 2 lower surfaces are provided with the main shaft Z axis guide-track groove 23 that main shaft Z-direction moves is used in conjunction with the Z axis guide rail of mainframe box.
One preferred embodiment in, as shown in Figure 4, the clamping of this Digit Control Machine Tool and feed arrangement 4 are arranged in machine tool main body 7 away from a side of main spindle box, there is feeding Z axis guide-track groove 44 bottom surface, matches with the Z axis guide rail 71 of machine tool main body; Comprise a pair of gripper 41, hydraulic clamp oil cylinder 2 42, charging servomotor 43 and feed roller ballscrew 45; Wherein gripper is used for clamping part to be processed 5, and hydraulic clamp oil cylinder 2 42 provides power for gripper 41; Charging servomotor 43 makes to clamp by feed roller ballscrew 45 conduction power and feed arrangement 4 moves to Z axis along Z axis guide rail, drives part to be processed 5 to move to Z axis, completes the feed motion of part to be processed 5.
One preferred embodiment in, as shown in Fig. 2,4, the clamping of this Digit Control Machine Tool and guider 3 are fixed in machine tool main body 7, between lathe headstock 1 and clamping and feed arrangement 4, comprise round hub 31 and hydraulic clamp oil cylinder 1; Wherein hydraulic clamp oil cylinder 1 provides power to make it to clamp part to be processed 5 to circle hub 31, plays the fixation of part; When needs unclamp part to be processed 5, circle hub 31 can loosen rapidly, the feeding while being convenient to part to be processed 5, and can also play guide effect when feeding.
One preferred embodiment in, as shown in Fig. 2,4, Z axis guide rail 71 and Z axis servomotor 72 are set in the machine tool main body of this Digit Control Machine Tool; Wherein on Z axis guide rail 71, be provided with main spindle box base 2 and clamping and feed arrangement 4, track can move along Z axis with making its upper-part coordinating of rail groove; Z axis servomotor 72 by Z axis ball-screw 73 for main spindle box base provides power, can drive main spindle box base 2 and on main spindle box 1 along Z axis move forward into.
One preferred embodiment in, as shown in fig. 1, this Digit Control Machine Tool is also with a pair of material supporting rack being arranged side by side along Z axis, two material supporting rack spacing determine according to part to be processed length, material supporting rack blowing position is V-shape.
One preferred embodiment in, as shown in fig. 1, the Parameters of The Parts of the suitable processing of this Digit Control Machine Tool is: diameter is 27mm-50mm; Length is 1000mm-6000mm; Drill centers diameter is 1.6mm-10mm.
Parts in above-mentioned all preferred embodiments move, and all, by digital control realization, movement velocity is reasonable, and accuracy is high.
The X-axis relating in above-mentioned explanation and Z axis, be virtual direction; X-direction and Z-direction are as shown in Fig. 1,5,6.
The present invention has following beneficial effect:
(1) slender axles end face milling, drill centers, turning three process clamped one time completes, and operating efficiency is high;
(2) adopt digital control clamping, location and the amount of feeding, feed speed, machining accuracy is high, and percent defective is low;
(3) after end face milling operation completes, main spindle box only needs X axis to move just can to make the centre drill alignment pieces center of next process, completes location, and grinding machine structure design is reasonable, saves the distance of main axle moving, and time availability is high;
(4) only need X axis to move during main shaft orientation, only need Z-axis direction to move during feeding, working line is simple, and failure rate is low is safe and reliable;
(5) hydraulic clamp workpiece and have supporting parts and guiding mechanism fixation workpiece, in process, workpiece is stable, and mismachining tolerance is little.
More than combine preferred embodiment and describe the present invention, but these embodiments are only exemplary, only play illustrative effect.On this basis, can carry out multiple replacement and improvement to the present invention, these all fall within the scope of protection of the present invention.

Claims (6)

1. thin and long shafts part end face milling drill centers turning specialized nc machine tool, is characterized in that: this Digit Control Machine Tool comprises
Main spindle box (1), main spindle box comprises three main shafts parallel to each other, three main shafts are respectively Milling Process main shaft (11), drilling machining spindle (12) and the machining spindle of harnessing an animal to a cart (13), three main shafts are horizontally disposed with and in same level, wherein, the machining spindle of harnessing an animal to a cart (13) is hollow structure, and the machining spindle (13) of harnessing an animal to a cart arranges through hole along axis direction, main spindle box bottom surface is provided with X-axis guide-track groove (14)
Main spindle box base (2), main spindle box base (2) upper surface is provided with the X-axis guide rail (21) matching with X-axis guide-track groove (14); Main spindle box base (2) lower surface is provided with main shaft Z axis guide-track groove (23), and main spindle box base front end arranges X-axis servomotor (22), and X-axis servomotor (22) is connected with main spindle box (1) by X-axis ball-screw;
Machine tool main body (7), its top arranges Z axis guide rail (71), the main spindle box base (2) that bottom is provided with main shaft Z axis guide-track groove (23) is arranged on Z axis guide rail (71), the left end at machine tool main body (7) top arranges Z axis servomotor (72), and Z axis servomotor (72) is connected with main spindle box base (2) by Z axis ball-screw (73); The right-hand member at machine tool main body (7) top arranges charging servomotor (43);
Facing cutter (11a), facing cutter is fixed on Milling Process main shaft;
Centre drill (12a), centre drill is fixed on drilling machining spindle;
Cover hull (13a), is provided with through hole along its axis, and cover hull is fixed on harnesses an animal to a cart on machining spindle;
Clamp and feed arrangement (4), be arranged on machine tool main body (7) away from a side of main spindle box (1), clamping and feed arrangement (4) bottom surface are provided with feeding Z axis guide-track groove (44), and feeding Z axis guide-track groove (44) matches with the Z axis guide rail (71) of machine tool main body; Clamping and feed arrangement (4) top arrange a pair of gripper (41), clamping and feed arrangement (4) front end arrange hydraulic clamp oil cylinder two (42), and clamping and feed arrangement (4) bottom are connected with charging servomotor (43) by feed roller ballscrew (45); With
Clamp and guider (3), it is fixed between machine tool main body (7) top lathe headstock (1) and clamping and feed arrangement (4), and clamping and guider (3) top arrange round hub (31) and hydraulic clamp oil cylinder one (32).
2. thin and long shafts part end face milling drill centers turning specialized nc machine tool according to claim 1, is characterized in that, this lathe also comprises two material supporting racks that are arranged side by side along Z-direction (6).
3. thin and long shafts part end face milling drill centers turning specialized nc machine tool according to claim 1, it is characterized in that, part to be processed (5) passes from outside to inside successively in jaw and circle hub (31), and wherein, the diameter of part to be processed is 27mm-50mm; Part to be processed length is 1000mm-6000mm; Boring part to be processed center-hole diameter is 1.6mm-10mm.
4. thin and long shafts part end face milling drill centers turning specialized nc machine tool according to claim 1, it is characterized in that, the harness an animal to a cart through hole of machining spindle and the diameter of through hole of cover hull is all greater than 50mm, and the center line of two through holes overlaps with the machining spindle center line of harnessing an animal to a cart.
5. thin and long shafts part end face milling drill centers turning specialized nc machine tool according to claim 1, it is characterized in that, three main shafts on main spindle box work independently in order, and the main shaft of not working is in dead ship condition, between each main shaft, work alone, do not interfere with each other.
6. thin and long shafts part end face milling drill centers turning specialized nc machine tool according to claim 1, it is characterized in that, relative position in described main spindle box between three main shafts is constant, and facing cutter outermost end equals or is slightly larger than the distance that centre drill outermost end arrives main spindle box to the distance of main spindle box.
CN201310492623.0A 2013-10-18 2013-10-18 Special numerical control machine tool for milling end face, drilling center hole and lathing outer circle of thin and long shaft part CN103522068A (en)

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Application Number Priority Date Filing Date Title
CN201310492623.0A CN103522068A (en) 2013-10-18 2013-10-18 Special numerical control machine tool for milling end face, drilling center hole and lathing outer circle of thin and long shaft part

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Application Number Priority Date Filing Date Title
CN201310492623.0A CN103522068A (en) 2013-10-18 2013-10-18 Special numerical control machine tool for milling end face, drilling center hole and lathing outer circle of thin and long shaft part

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Publication Number Publication Date
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104014822A (en) * 2014-05-16 2014-09-03 苏州创丰精密五金有限公司 Machining device used for annular grooves in long-axis products
CN104190952A (en) * 2014-07-15 2014-12-10 武汉兆航精密工业有限公司 Machining tool for long-shaft parts
CN105436893A (en) * 2014-08-07 2016-03-30 东营信盛机械有限公司 Machine tool for automatically milling two end faces and drilling central holes of pin shaft
CN106064311A (en) * 2016-07-29 2016-11-02 中国长江动力集团有限公司 A kind of big overhanging narrow drill reaming power set and large-sized numerical control sleeping carriage
CN107282953A (en) * 2017-06-13 2017-10-24 嘉兴耐思得模具科技有限公司 A kind of engine lathe positioner
CN107824850A (en) * 2017-11-02 2018-03-23 齐齐哈尔齐机工业产品有限公司 A kind of rotating shaft keyway specific CNC milling machine
CN108705261A (en) * 2018-03-30 2018-10-26 西安西航集团莱特航空制造技术有限公司 A kind of elongated shaft design basis hole forming method of spline

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104014822A (en) * 2014-05-16 2014-09-03 苏州创丰精密五金有限公司 Machining device used for annular grooves in long-axis products
CN104014822B (en) * 2014-05-16 2017-01-25 苏州创丰精密五金有限公司 Machining device used for annular grooves in long-axis products
CN104190952A (en) * 2014-07-15 2014-12-10 武汉兆航精密工业有限公司 Machining tool for long-shaft parts
CN105436893A (en) * 2014-08-07 2016-03-30 东营信盛机械有限公司 Machine tool for automatically milling two end faces and drilling central holes of pin shaft
CN105436893B (en) * 2014-08-07 2018-01-19 东营信盛机械有限公司 The automatic milling both ends of the surface drill centres machine tool of bearing pin
CN106064311A (en) * 2016-07-29 2016-11-02 中国长江动力集团有限公司 A kind of big overhanging narrow drill reaming power set and large-sized numerical control sleeping carriage
CN107282953A (en) * 2017-06-13 2017-10-24 嘉兴耐思得模具科技有限公司 A kind of engine lathe positioner
CN107282953B (en) * 2017-06-13 2019-01-15 嘉兴耐思得模具科技有限公司 A kind of center lathe positioning device
CN107824850A (en) * 2017-11-02 2018-03-23 齐齐哈尔齐机工业产品有限公司 A kind of rotating shaft keyway specific CNC milling machine
CN108705261A (en) * 2018-03-30 2018-10-26 西安西航集团莱特航空制造技术有限公司 A kind of elongated shaft design basis hole forming method of spline
CN108705261B (en) * 2018-03-30 2020-04-03 西安西航集团莱特航空制造技术有限公司 Method for machining slender shaft design reference hole of spline

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Application publication date: 20140122