CN109986155A - Bolt outlet end micro groove structure processing tool and method in a kind of engine ejector filler - Google Patents
Bolt outlet end micro groove structure processing tool and method in a kind of engine ejector filler Download PDFInfo
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- CN109986155A CN109986155A CN201910330639.9A CN201910330639A CN109986155A CN 109986155 A CN109986155 A CN 109986155A CN 201910330639 A CN201910330639 A CN 201910330639A CN 109986155 A CN109986155 A CN 109986155A
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- ejector filler
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- micro groove
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/02—Wire-cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H9/00—Machining specially adapted for treating particular metal objects or for obtaining special effects or results on metal objects
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H2500/00—Holding and positioning of tool electrodes
- B23H2500/20—Methods or devices for detecting wire or workpiece position
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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
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- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
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Abstract
The present invention relates to bolt outlet end micro groove structure processing tool and methods in a kind of engine ejector filler, method are as follows: design can guarantee the interior pinpoint clamping tooling of bolt part convenient for wire cutting machine tool clamping simultaneously, then interior bolt of the cutting on line equipment precision centering clamping in tooling, then according to the initial position of the micro groove structure position precision centering wire electrode to be processed, then setting EDM parameter processes first pair of micro groove structure, repeats accurate centering when finally continuing micro groove structure after processing.Tooling includes cylindrical centering portion, centering portion two sides are respectively equipped with boss, the wherein boss of side, it is denoted as clamping portion, is used for clamping cutting on line equipment, other side boss, it is denoted as positioning region, positioning region outer surface and mounting flange central pit hole tight fit, clamping portion, centering portion, positioning region are coaxial, and the bottom surface in centering portion is vertical with the cylinder in clamping portion.The present invention solves the processing problem of interior bolt export structure high-precision requirement in ejector filler.
Description
Technical field
The present invention relates to technical field, especially a kind of precision of the symmetrical micro groove structure of ejector filler high density adds
Work method.
Background technique
In field of aerospace, pintle formula ejector filler is a kind of common ejector filler mode, and interior bolt part in ejector filler
Export structure directly determine the control of uninterrupted and uniformity.In order to achieve the purpose that accurate flow control, certain is newly ground
Engine ejector filler uses the combining form of the symmetrical micro groove structure+circumferential weld of high density for the first time, wherein interior bolt outlet end contains
36 (totally 18 pairs) micro groove structures being along the circumferential direction uniformly distributed, size is small (depth 0.14mm, width 0.3mm), essence
Degree requires height, and the consistency of microflute and position degree requirement are high, and the area and position degree of micro groove structure directly affect ejector filler
Uninterrupted and uniformity, on the one hand determine the efficiency of combustion of propellant, on the other hand influence engine chamber wall surface
Film cooling efficiency, plays the role of the Performance And Reliability of engine vital, is the nuclear structure of ejector filler.Mesh
Before, mainly there are machining and linear cutter etc. for the precision machining method of micro groove structure, and machining is limited by
The size high-precision and the requirement of high position degree of this micro groove structure, are extremely difficult to part requirements, linear cutter with its it is non-contact plus
Work without obvious macro-stress, processable microsize and positioning accuracy are high the advantages that, it can be achieved that high density microflute Precision Machining,
But due to interior bolt part flange be tetragonal, be accurately positioned clamping it is difficult, meanwhile, influence linear cutter because
Element it is also very much, the improper dimensional homogeneity that can all cause the symmetrical micro groove structure of high density such as aligning method, EDM parameter and
Surface smoothness is difficult to meet the requirements.Meanwhile bolt micro groove structure totally 36 in the ejector filler, need up to 18 times repetitions to turn over
Turn, easily accumulative Clamped Positioning Error in process, the consistency of uniformly distributed microflute needs to use it is difficult to ensure that design requirement
Special method ensures the area and position degree of multiple micro groove structures.
Summary of the invention
Technology of the invention solves the problems, such as: providing bolt outlet end micro groove structure processing tool in a kind of engine ejector filler
And method, solve the processing problem of interior bolt export structure high-precision requirement in ejector filler.
The technical solution of the invention is as follows:
Bolt outlet end micro groove structure processing tool in a kind of engine ejector filler, the micro groove structure are along the circumferential direction uniformly distributed
In ejector filler on the end face of bolt outlet end, bolt outlet extreme direction is perpendicular to mounting flange in ejector filler, bolt outlet end in ejector filler
End face is parallel with mounting flange bottom surface, and the outer profile of mounting flange is non-circular structure, at back center with bolt in ejector filler
The corresponding position in outlet end is equipped with shrinkage pool, and shrinkage pool and bolt outlet end in ejector filler are coaxial；The tooling includes cylindrical centering portion,
Centering portion two sides are respectively equipped with boss, wherein the boss of side, are denoted as clamping portion, are used for clamping cutting on line equipment, another
Side boss is denoted as positioning region, positioning region outer surface and mounting flange central pit hole tight fit, for bolt in ejector filler to be fixed on
In tooling, clamping portion, centering portion, positioning region are coaxial, and the bottom surface in centering portion is vertical with the cylinder in clamping portion.
The verticality of the bottom surface of the clamping portion side and centering portion of the tooling is within 0.01, in centering portion and ejector filler
The flatness of bolt flange face binding face guarantees within 0.01mm, clamping portion, centering portion, positioning region concentricity in 0.01mm,
Clamping portion, centering portion, positioning region are integrally formed and are process.
Bolt outlet end micro groove structure processing method in a kind of engine ejector filler based on the tooling, including walk as follows
It is rapid:
(1), bolt in ejector filler is fastened on the processing tool, guarantees the clamping portion of processing tool and is fixed on work
The outer circles of bolt outlet end meet preset requirement in the ejector filler loaded onto；
(2), it by the processing tool clamping to the precision indexer of linear cutting equipment after bolt in fastening ejector filler, will process
The centering portion centering of tooling；
(3), by bolt outlet end centering in ejector filler；
(4), using electric discharge opposite side aligning method, the origin position of bolt outlet end in wire electrode cutting ejector filler is found, and
Wire cutting micro groove structure.
The step (4) method particularly includes:
(4.1), linear cutting equipment wire electrode is placed near the end face of interior bolt outlet end；
(4.2), by multimeter side test pencil receiving electrode silk, other side test pencil connects bolt in ejector filler；
(4.3), the linear cutting equipment pulse power is opened, multimeter is placed in ohms range, general-purpose list index is in most at this time
Right side；
(4.4), traveling electrode silk makes it close to interior bolt outlet end end face, until wire electrode and interior bolt outlet end end face connect
Touching；
(4.5), when the generation of general-purpose list index is significantly swung, i.e., multimeter is short circuit by open circuit variation, will be electric at this time
Wire electrode origin position is arranged in polar filament position；
(4.6), multiple step (4.4)~step (4.6), it is wire electrode that confirmation, which connects bolt outlet end endface position in ejector filler,
Origin position；
(4.7), it is cut according to wire electrode origin position and the requirement of microflute size, and the wire cutting technology parameter of optimization, line
Cut first pair of micro groove structure of processing；
(4.8), after rotating dividing head after first pair of micro groove structure of processing, repeat the above steps (4.1)~step
(4.8), lower a pair of of the micro groove structure of processing, until all pairs of micro groove structures all complete the process.
Increase following steps after the step (4.2): closing the pulse power of linear cutting equipment, and by two, multimeter
Test pencil touches together, so that bolt outlet end end face and wire electrode short circuit in ejector filler, discharge extra electricity in order to avoid damaging general-purpose
Table.
The linear cutting equipment is EDM micro elements equipment, and the servo-system amount of feeding is can be controlled in micro-scaled range,
Machining accuracy is within 5 μm, preferred bar of rope Sorepi LM electric machining liquid of working solution.
The specific implementation of the step (3) is: in measurement ejector filler bolt outlet end and clamping end concentricity whether
Within 0.01mm, it is, then it is assumed that otherwise centering finely tunes interior bolt mounting flange and processing tool for bolt outlet end in ejector filler
Centering portion is bonded the relative position at position, until bolt outlet end and clamping end concentricity are within 0.01mm in ejector filler.
Compared with the prior art, the invention has the advantages that:
(1), the present invention devises the processing tool of bolt outlet end micro groove structure in engine ejector filler, which is convenient for line
Cutting off machine clamping, while can guarantee that interior bolt part is accurately positioned；
(2), present invention determine that in engine ejector filler the processing of bolt outlet end micro groove structure wire cutting precision centering side
Method can accurately determine initial position of the wire electrode with respect to micro groove structure by the aligning method, improve positioning accuracy；
(3), present invention determine that in engine ejector filler bolt outlet end micro groove structure linear cutter optimum process ginseng
Number range, ensure that the dimensional accuracy and roughness requirements of micro groove structure；
(4) it is symmetrical more to process by multiple opposite side to determine the initial position of wire electrode to precision machining method of the invention
A micro groove structure ensure that the size and position degree consistency of micro groove structure.
Detailed description of the invention
Fig. 1 (a) is bolt cross-sectional view in ejector filler of the present invention；
Fig. 1 (b) is bolt outlet end micro groove structure schematic diagram in ejector filler of the present invention；
Fig. 2 (a) is Special precision positioning and clamping tooling left view of the embodiment of the present invention；
Fig. 2 (b) is Special precision positioning and clamping tooling front view of the embodiment of the present invention；
Fig. 3 is the precision machining method process flow chart of the symmetrical micro groove structure of high density of the embodiment of the present invention；
Fig. 4 is wire cutting of embodiment of the present invention electric discharge opposite side aligning method schematic diagram.
Specific embodiment
The present invention is described in further detail in the following with reference to the drawings and specific embodiments:
As shown in Fig. 1 (a) and Fig. 1 (b), the micro groove structure is along the circumferential direction evenly arranged on bolt outlet end end face in ejector filler
On, bolt outlet extreme direction is perpendicular to mounting flange in ejector filler, and bolt outlet end end face is parallel with mounting flange bottom surface in ejector filler,
The outer profile of mounting flange is non-circular structure, and position corresponding with bolt outlet end in ejector filler is equipped with recessed at back center
Hole, shrinkage pool and bolt outlet end in ejector filler are coaxial.
The object of the present invention is to provide in a kind of ejector filler bolt outlet the symmetrical micro groove structure of high density precision machining method,
Main processing route are as follows: design can guarantee the pinpoint dedicated fixed dress of interior bolt part convenient for wire cutting machine tool clamping simultaneously
Press from both sides tooling, then cutting on line equipment precision centering clamping dedicated fixing tool interior bolt, then according to the microflute to be processed
Then the initial position of locations of structures precision centering wire electrode sets EDM parameter and processes first pair of micro groove structure, then exists
Accurate centering is repeated when processing subsequent micro groove structure, completes the Precision Machining of high density micro groove structure.
As shown in Fig. 2 (a) and Fig. 2 (b), bolt outlet end micro groove structure adds in a kind of engine ejector filler provided by the invention
Work tooling includes cylindrical centering portion, and centering portion two sides are respectively equipped with boss, and wherein the boss of side, is denoted as clamping portion, is used for
In clamping cutting on line equipment, other side boss is denoted as positioning region, positioning region outer surface and mounting flange central pit hole close-fitting
It closes, for bolt in ejector filler to be fixed on tooling, clamping portion, centering portion, positioning region are coaxial, the bottom surface and clamping portion in centering portion
Cylinder it is vertical.The verticality of the bottom surface (face B) of the clamping portion side (face A) and centering portion of the tooling is within 0.01；It looks for
The flatness of bolt flange face binding face guarantees within 0.01mm in positive portion and ejector filler.The face A (clamping portion) and the face C (positioning region)
Concentricity need to guarantee that, in 0.01mm, the flatness in the face B (centering portion) need to guarantee within 0.01mm, while the face boss outer circle C
The stringent tight fit of the inner hole of (positioning region) and interior bolt part end face is processed.The clamping portion, centering portion, positioning region concentricity exist
In 0.01mm, clamping portion, centering portion, positioning region are integrally formed and are process.
As shown in figure 3, the present invention also provides bolt outlet end micro groove structure processing method in a kind of engine ejector filler, it should
Method includes the following steps:
(1), bolt in ejector filler is fastened on processing tool described in claim 1, guarantees the clamping portion of processing tool
Meet preset requirement with the outer circles for being fixed on bolt outlet end in the ejector filler in tooling；Bolt part in ejector filler is passed through
Positioning region (face boss C) positioning, while interior bolt part is bonded completely with dedicated fixed clamping tooling centering portion (face B), centering 8
The hole location of screw hole, with screw by interior bolt fastening parts on dedicated fixed clamping tooling.
(2), it by the processing tool clamping to the precision indexer of linear cutting equipment after bolt in fastening ejector filler, will process
The centering portion centering of tooling.Specifically: adjustment wire cutting machine tool, with the clamping of the dedicated fixed clamping tooling of dividing head three-jaw clamping
Amesdial is fixed on the suitable position of wire cutting machine tool by the part face A (clamping portion), design specialized parallels, makes table centering ejector filler
Interior bolt part need to process the outer circle at micro groove structure, and the position of interior bolt is finely tuned by adjusting fastening screw, is guaranteed at micro groove structure
Outer circle beat within 0.01mm, then tighten fastening screw.
(3), by bolt outlet end centering in ejector filler.Specifically: bolt outlet end and clamping end concentricity in measurement ejector filler
Whether within 0.01mm, it is, then it is assumed that otherwise centering is finely tuned interior bolt mounting flange and added for bolt outlet end in ejector filler
Work tooling centering portion is bonded the relative position at position, until in ejector filler bolt outlet end and clamping end concentricity 0.01mm with
It is interior.
(4), using electric discharge opposite side aligning method, the origin position of bolt outlet end in wire electrode cutting ejector filler is found, and
Wire cutting micro groove structure.Specifically:
(4.1), linear cutting equipment wire electrode is placed near the end face of bolt outlet end；
(4.2), by multimeter side test pencil receiving electrode silk, other side test pencil connects bolt in ejector filler, as shown in Figure 4；
(4.3), the linear cutting equipment pulse power is opened, multimeter is placed in ohms range, manual control box or operation panel make interior
Bolt part approaches to measure with wire electrode, and wire electrode is moved on to interior bolt end face with manual control box or operation panel, guarantees contact
Well, general-purpose list index is in the rightmost side at this time；
(4.4), manual control box or operation panel is used to make it close to interior bolt with the speed traveling electrode silk of each 0.002mm
Outlet end end face, until wire electrode is contacted with interior bolt outlet end end face；
(4.5), when the generation of general-purpose list index is significantly swung, i.e., multimeter is short circuit by open circuit variation, illustrates electrode
Silk is connected with interior bolt outlet end end face moment, wire electrode origin position will be arranged in wire electrode position at this time；
(4.6), multiple step (4.4)~step (4.6) confirms that bolt outlet end endface position is that wire electrode is former in ejector filler
Point position；By multiple centering, error is up to 0.004mm, can meet uniformly distributed microflute processing centering requirement.
It is worth noting that: the pulse power of linear cutting equipment should be closed before step (4.4)~step (4.6) measurement,
And two test pencils of multimeter are touched together, the general-purpose list index when bolt outlet end end face in ejector filler and wire electrode instantaneous touch
To zero, bolt outlet end end face and wire electrode short circuit in ejector filler discharge extra electricity in order to avoid damage multimeter.It is when contact just
The edge of wire electrode is sought behind side and being needed plus the radius compensation of silk, it is ensured that the verticality high-precision requirement of wire electrode and micro groove structure
And wire electrode is with respect to the exact position of bolt in ejector filler.
(4.7), according to wire electrode origin position and the requirement of microflute size, linear cutter first is to micro groove structure；
The linear cutting equipment is EDM micro elements equipment, and the servo-system amount of feeding is can be controlled in micro-scaled range,
Machining accuracy is within 5 μm, preferred bar of rope Sorepi LM electric machining liquid of work box liquid.
The electrical parameter selection of wire cutting micro groove structure uses orthogonal test method, influences wire cutting in conjunction with processing experience selection
The technic index factor of processing is uniformly distributed test data point, sets orthogonal test, line program cutting movement track and default electricity
Machined parameters, including polarity of electrode, discharge waveform, pulse width, pulse spacing, feed speed, peak point current etc. carry out preliminary
Test, continues to optimize every electrical parameter, guarantees the dimensional accuracy and surface roughness requirements of micro groove structure.
The preferable EDM parameter of reliability is as follows: polarity of electrode, positive polarity；Discharge waveform, rectangle；Pulse width, 1-3
μs；Pulse spacing 18-20 μ s；Silk speed: 1-1.2m/s；Feed speed: 0.6-1；Peak point current 0.8-1.2A.
(4.8), after rotating dividing head after first pair of micro groove structure of processing, repeat the above steps (4.1)~step
(4.8), lower a pair of of the micro groove structure of processing, until all pairs of micro groove structures all complete the process.
Embodiment:
Using bolt part in the special tooling clamping of design, it is electric to 0.01mm that wire cutting machine tool beats bolt outer circle in table centering
Polar filament centering is to 0.003mm, and linear cutter parameter designing is as follows: polarity of electrode, positive polarity；Discharge waveform, rectangle；Pulse is wide
Degree, 2 μ s；18 μ s of pulse spacing；Silk speed: 2m/s；Feed speed: 1；Peak point current 1A.
Implementation result: observed under high power image instrument the micro groove structure dimensional accuracies of 36 interior bolt parts of processing with it is consistent
Property is preferable.
The content that description in the present invention is not described in detail belongs to the well-known technique of those skilled in the art.
Claims (10)
1. bolt outlet end micro groove structure processing tool, the micro groove structure are along the circumferential direction evenly arranged in a kind of engine ejector filler
In ejector filler on the end face of bolt outlet end, bolt outlet extreme direction is perpendicular to mounting flange in ejector filler, bolt outlet end end in ejector filler
Face is parallel with mounting flange bottom surface, and the outer profile of mounting flange is non-circular structure, goes out at back center with bolt in ejector filler
The corresponding position in mouth end is equipped with shrinkage pool, and shrinkage pool and bolt outlet end in ejector filler are coaxial；It is characterized by: the tooling includes cylinder
Shape centering portion, centering portion two sides are respectively equipped with boss, and wherein the boss of side, is denoted as clamping portion, for frock clamping is online
On cutting equipment, other side boss is denoted as positioning region, positioning region outer surface and mounting flange central pit hole tight fit, and being used for will
Bolt is fixed in tooling in ejector filler, and clamping portion, centering portion, positioning region are coaxial, and the bottom surface in centering portion and the cylinder in clamping portion hang down
Directly.
2. being based on bolt outlet end micro groove structure processing tool in a kind of engine ejector filler described in claim 1, feature exists
In the clamping portion side and centering portion of the tooling bottom surface verticality within 0.01.
3. being based on bolt outlet end micro groove structure processing tool in a kind of engine ejector filler described in claim 1, feature exists
Guarantee within 0.01mm in the flatness of bolt flange face binding face in the centering portion of the tooling and ejector filler.
4. being based on bolt outlet end micro groove structure processing tool in a kind of engine ejector filler described in claim 1, feature exists
In the clamping portion, centering portion, positioning region concentricity in 0.01mm.
5. being based on bolt outlet end micro groove structure processing tool in a kind of engine ejector filler described in claim 1, feature exists
It is integrally formed and is process in clamping portion, centering portion, positioning region.
6. bolt outlet end micro groove structure processing method in a kind of engine ejector filler based on tooling described in claim 1, special
Sign is to include the following steps:
(1), bolt in ejector filler is fastened on processing tool described in claim 1, guarantees the clamping portion of processing tool and consolidated
The outer circles for being scheduled on bolt outlet end in the ejector filler in tooling meet preset requirement；
(2), it will fasten on processing tool clamping to the precision indexer of linear cutting equipment in ejector filler after bolt, by processing tool
Centering portion centering；
(3), by bolt outlet end centering in ejector filler；
(4), using electric discharge opposite side aligning method, the origin position of bolt outlet end in wire electrode cutting ejector filler is found, doubling is cut
Cut micro groove structure.
7. bolt outlet end micro groove structure processing method in a kind of engine ejector filler of tooling according to claim 6, special
Sign is the step (4) method particularly includes:
(4.1), linear cutting equipment wire electrode is placed near the end face of interior bolt outlet end；
(4.2), by multimeter side test pencil receiving electrode silk, other side test pencil connects bolt in ejector filler；
(4.3), the linear cutting equipment pulse power is opened, multimeter is placed in ohms range, general-purpose list index is in the rightmost side at this time；
(4.4), traveling electrode silk makes it close to interior bolt outlet end end face, until wire electrode is contacted with interior bolt outlet end end face；
(4.5), when the generation of general-purpose list index is significantly swung, i.e., multimeter is short circuit by open circuit variation, will wire electrode at this time
Wire electrode origin position is arranged in position；
(4.6), multiple step (4.4)~step (4.6), it is wire electrode origin that confirmation, which connects bolt outlet end endface position in ejector filler,
Position；
(4.7), added according to wire electrode origin position and the requirement of microflute size, and the wire cutting technology parameter of optimization, wire cutting
Work first is to micro groove structure；
(4.8), after rotating dividing head after first pair of micro groove structure of processing, (the 4.1)~step that repeats the above steps (4.8) adds
A pair of of micro groove structure under work, until all pairs of micro groove structures all complete the process.
8. bolt outlet end micro groove structure processing method in a kind of engine ejector filler based on tooling described in claim 7, special
Sign is to increase following steps after the step (4.2):
The pulse power of linear cutting equipment is closed, and two test pencils of multimeter are touched together, so that bolt outlet end in ejector filler
End face and wire electrode short circuit discharge extra electricity in order to avoid damaging multimeter.
9. bolt outlet end micro groove structure processing method in a kind of engine ejector filler based on tooling described in claim 6, special
Sign is that the linear cutting equipment is EDM micro elements equipment, and the servo-system amount of feeding can be controlled in micro-scaled range, adds
Work precision is within 5 μm, preferred bar of rope Sorepi LM electric machining liquid of working solution.
10. bolt outlet end micro groove structure processing method in a kind of engine ejector filler according to claim 6, feature exist
Specific implementation in the step (3) is: in measurement ejector filler bolt outlet end and clamping end concentricity whether within 0.01mm,
It is, then it is assumed that otherwise centering finely tunes interior bolt mounting flange and processing tool centering portion sticking part for bolt outlet end in ejector filler
The relative position of position, until bolt outlet end and clamping end concentricity are within 0.01mm in ejector filler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910330639.9A CN109986155B (en) | 2019-04-23 | 2019-04-23 | Engine injector inner bolt outlet end micro-groove structure machining tool and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910330639.9A CN109986155B (en) | 2019-04-23 | 2019-04-23 | Engine injector inner bolt outlet end micro-groove structure machining tool and method |
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| CN109986155A true CN109986155A (en) | 2019-07-09 |
| CN109986155B CN109986155B (en) | 2021-06-11 |
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| CN113814494A (en) * | 2021-08-31 | 2021-12-21 | 西安航天发动机有限公司 | Precise machining method for closed injection groove of pintle injector |
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| CN109986155B (en) | 2021-06-11 |
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