CN109986155B - Engine injector inner bolt outlet end micro-groove structure machining tool and method - Google Patents
Engine injector inner bolt outlet end micro-groove structure machining tool and method Download PDFInfo
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- CN109986155B CN109986155B CN201910330639.9A CN201910330639A CN109986155B CN 109986155 B CN109986155 B CN 109986155B CN 201910330639 A CN201910330639 A CN 201910330639A CN 109986155 B CN109986155 B CN 109986155B
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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
Abstract
The invention relates to a tool and a method for machining a micro-groove structure at the outlet end of an inner bolt of an engine injector, wherein the method comprises the following steps: the method comprises the steps of designing a clamping tool which is convenient for clamping a linear cutting machine and can ensure accurate positioning of an inner bolt part, precisely aligning and clamping an inner bolt of the tool on a linear cutting device, precisely aligning the initial position of a wire electrode according to the position of a micro-groove structure to be machined, setting an electric machining parameter to machine a first pair of micro-groove structures, and finally repeatedly precisely aligning when the subsequent micro-groove structures are machined. The frock includes that cylindrical alignment portion, alignment portion both sides are equipped with the boss respectively, and the boss of one of them side is marked as clamping portion for on the clamping wire-electrode cutting equipment, the opposite side boss is marked as location portion, location portion surface and mounting flange center shrinkage pool tight fit, clamping portion, alignment portion, location portion are coaxial, and the bottom surface of alignment portion is perpendicular with the cylinder of clamping portion. The invention solves the processing problem of high precision requirement of the inner bolt outlet structure in the injector.
Description
Technical Field
The invention relates to the technical field of special processing, in particular to a precision processing method of a high-density symmetrical microgroove structure of an injector.
Background
In the field of aerospace, a pintle injector is a common injector mode, and the outlet structure of an inner bolt part in the injector directly determines the control of the flow size and uniformity. In order to achieve the purpose of accurately controlling the flow, a newly developed motive injector adopts a combination form of a high-density symmetrical micro-groove structure and a circular seam for the first time, wherein the outlet end of an inner bolt comprises 36 (18 pairs in total) micro-groove structures which are uniformly distributed along the circumferential direction, the sizes of the micro-groove structures are small (the depth is 0.14mm, the width is 0.3mm), the precision requirement is high, the consistency and the position degree of the micro-grooves are extremely high, the area and the position degree of the micro-groove structures directly influence the flow size and the uniformity of the injector, the combustion efficiency of a propellant is determined on one hand, the liquid film cooling efficiency of the wall surface of a combustion chamber of the engine is influenced on the other hand, the jet injector plays an important role in the performance and the reliability of the engine. At present, the precision machining method for the micro-groove structure mainly comprises cutting machining, linear cutting machining and the like, the cutting machining is limited by the requirements of high size precision and high position degree of the micro-groove structure, the requirements of parts are difficult to achieve, the linear cutting machining has the advantages of no obvious macroscopic stress in non-contact machining, small size machining, high positioning precision and the like, and the precision machining of the high-density micro-groove can be realized. Meanwhile, 36 structures of the inner bolt microgrooves of the injector need repeated overturning for 18 times, clamping and positioning errors are easy to accumulate in the machining process, the consistency of uniformly distributed microgrooves is difficult to guarantee the design requirement, and therefore a special method is needed to guarantee the area and the position degree of the structures of the microgrooves.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the tool and the method for machining the micro-groove structure at the outlet end of the inner bolt of the injector of the engine solve the machining problem of high-precision requirement of the outlet structure of the inner bolt in the injector.
The technical solution of the invention is as follows:
a micro-groove structure machining tool for an outlet end of an injector inner bolt of an engine is characterized in that micro-groove structures are uniformly distributed on the end face of the outlet end of the injector inner bolt along the circumferential direction, the direction of the outlet end of the injector inner bolt is perpendicular to a mounting flange, the end face of the outlet end of the injector inner bolt is parallel to the bottom surface of the mounting flange, the outer contour of the mounting flange is of a non-circular structure, a concave hole is formed in the center of the back face of the mounting flange and corresponds to the outlet end of the injector inner bolt, and the concave hole; the tool comprises a cylindrical alignment part, wherein bosses are arranged on two sides of the alignment part respectively, the boss on one side is marked as a clamping part and used for clamping the wire-electrode cutting equipment, the boss on the other side is marked as a positioning part, the outer surface of the positioning part is tightly matched with a central concave hole of a mounting flange and used for fixing an inner bolt of the injector on the tool, the clamping part, the alignment part and the positioning part are coaxial, and the bottom surface of the alignment part is perpendicular to the cylindrical surface of the clamping part.
The perpendicularity of the side face of the clamping part of the tool and the bottom face of the alignment part is within 0.01, the flatness of the joint face of the alignment part and the flange face of the inner bolt of the injector is guaranteed to be within 0.01mm, the coaxiality of the clamping part, the alignment part and the positioning part is within 0.01mm, and the clamping part, the alignment part and the positioning part are integrally formed and machined.
The machining method of the engine injector inner bolt outlet end micro-groove structure based on the tool comprises the following steps:
(1) fastening the injector inner bolt to the processing tool to ensure that the coaxiality of the clamping part of the processing tool and the excircle of the outlet end of the injector inner bolt fixed on the tool meets the preset requirement;
(2) clamping the machining tool after fastening the inner bolt of the injector on a precision dividing head of the linear cutting equipment, and aligning an alignment part of the machining tool;
(3) aligning the outlet end of the inner bolt of the injector;
(4) and finding the original position of the outlet end of the inner plug of the wire electrode cutting injector by using a discharge opposite side alignment method, and cutting the micro-groove structure in a linear mode.
The specific method of the step (4) comprises the following steps:
(4.1) placing a wire electrode of a linear cutting device near the end face of the outlet end of the inner plug;
(4.2) connecting a meter pen on one side of the universal meter with the electrode wire, and connecting a meter pen on the other side of the universal meter with an injector inner bolt;
(4.3) turning on a pulse power supply of the wire cutting equipment, and placing the universal meter at an ohmic gear, wherein the pointer of the universal meter is positioned at the rightmost side;
(4.4) moving the wire electrode to enable the wire electrode to be close to the end face of the outlet end of the inner bolt until the wire electrode is contacted with the end face of the outlet end of the inner bolt;
(4.5) when the pointer of the universal meter swings greatly, namely the universal meter changes from open circuit to short circuit, and the position of the electrode wire at the moment is set as the original position of the electrode wire;
(4.6) and a plurality of steps (4.4) to (4.6), confirming that the end face position of the outlet end of the inner bolt of the injector is the original position of the wire electrode;
(4.7) carrying out linear cutting machining on a first pair of micro-groove structures according to the original point position of the wire electrode, the size requirement of the micro-grooves and optimized linear cutting process parameters;
(4.8) after the first pair of micro-groove structures are machined, the dividing head is rotated, the steps (4.1) to (4.8) are repeated, and the next pair of micro-groove structures are machined until all the micro-groove structures are machined.
The step (4.2) is added with the following steps: and closing a pulse power supply of the linear cutting equipment, and touching two meter pens of the universal meter together, so that the end face of the outlet end of the inner plug of the injector is in short circuit with the electrode wire, and redundant electric quantity is released to avoid damaging the universal meter.
The linear cutting equipment is micro-electro-machining equipment, the feeding amount of a servo system of the linear cutting equipment can be controlled within a micron-sized range, the machining precision is within 5 mu m, and the working liquid is preferably Barcol Sorepi LM electro-machining liquid.
The specific implementation of the step (3) is as follows: and measuring whether the coaxiality of the outlet end of the inner bolt of the injector and the clamping end is within 0.01mm, if so, determining that the outlet end of the inner bolt of the injector is aligned, otherwise, finely adjusting the relative position of the mounting flange of the inner bolt and the joint part of the alignment part of the machining tool until the coaxiality of the outlet end of the inner bolt of the injector and the clamping end is within 0.01 mm.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention designs a processing tool for the micro-groove structure at the outlet end of the inner bolt of the engine injector, which is convenient for clamping a linear cutting machine and can ensure the accurate positioning of inner bolt parts;
(2) the invention determines the linear cutting precision alignment method for processing the micro-groove structure at the outlet end of the inner bolt of the engine injector, and the initial position of the wire electrode relative to the micro-groove structure can be accurately determined by the alignment method, so that the positioning precision is improved;
(3) the optimal technological parameter range of the linear cutting processing of the micro-groove structure at the outlet end of the inner bolt of the engine injector is determined, and the requirements of the size precision and the roughness of the micro-groove structure are met;
(4) the precision machining method of the invention processes a plurality of symmetrical micro-groove structures by determining the initial position of the electrode wire through multiple opposite sides, thereby ensuring the consistency of the size and the position degree of the micro-groove structures.
Drawings
FIG. 1(a) is a cross-sectional view of an injector inner plug of the present invention;
FIG. 1(b) is a schematic view of the structure of the microgrooves at the outlet end of the inner plug of the injector according to the present invention;
FIG. 2(a) is a left side view of the special precision positioning and clamping tool in the embodiment of the invention;
FIG. 2(b) is a front view of the special precision positioning and clamping tool in the embodiment of the invention;
FIG. 3 is a process flow diagram of a precision machining method for high-density symmetrical micro-groove structures according to an embodiment of the present invention;
fig. 4 is a schematic view of a method for aligning discharge edges of wire cutting according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples:
as shown in fig. 1(a) and fig. 1(b), the micro-groove structures are uniformly distributed on the end surface of the outlet end of the inner bolt of the injector along the circumferential direction, the direction of the outlet end of the inner bolt of the injector is perpendicular to the mounting flange, the end surface of the outlet end of the inner bolt of the injector is parallel to the bottom surface of the mounting flange, the outer contour of the mounting flange is of a non-circular structure, a concave hole is arranged in the center of the back surface of the mounting flange and corresponds to the outlet end of the inner bolt of the injector, and the.
The invention aims to provide a precision machining method for a high-density symmetrical microgroove structure of an injector inner plug outlet, which mainly comprises the following machining routes: the special fixing and clamping tool convenient for clamping of the linear cutting machine tool and capable of guaranteeing accurate positioning of the inner bolt part is designed, then the inner bolt of the special fixing tool is precisely aligned and clamped on the linear cutting equipment, then the initial position of the electrode wire is precisely aligned according to the position of the micro-groove structure to be machined, then the first pair of micro-groove structures are machined by setting the electrical machining parameters, and then the precise alignment is repeated when the subsequent micro-groove structures are machined, so that the precise machining of the high-density micro-groove structure is completed.
As shown in fig. 2(a) and 2(b), the tool for processing the micro-groove structure at the outlet end of the inner bolt of the engine injector provided by the invention comprises a cylindrical alignment part, wherein bosses are respectively arranged on two sides of the alignment part, the boss on one side is marked as a clamping part and used for clamping on a wire cutting device, the boss on the other side is marked as a positioning part, the outer surface of the positioning part is tightly matched with a central concave hole of a mounting flange and used for fixing the inner bolt of the injector on the tool, the clamping part, the alignment part and the positioning part are coaxial, and the bottom surface of the alignment part is perpendicular to the cylindrical surface of the clamping part. The verticality of the side surface (surface A) of the clamping part of the tool and the bottom surface (surface B) of the alignment part is within 0.01; the flatness of the joint surface of the alignment part and the flange surface of the inner bolt of the injector is ensured to be within 0.01 mm. The coaxiality of the surface A (clamping part) and the surface C (positioning part) needs to be guaranteed to be 0.01mm, the flatness of the surface B (alignment part) needs to be guaranteed to be within 0.01mm, and meanwhile, the surface C (positioning part) of the excircle of the boss and the inner hole of the end face of the inner bolt part are tightly matched and machined strictly. The coaxiality of the clamping part, the alignment part and the positioning part is within 0.01mm, and the clamping part, the alignment part and the positioning part are integrally formed and processed.
As shown in FIG. 3, the invention also provides a method for processing the micro-groove structure at the outlet end of the inner bolt of the engine injector, which comprises the following steps:
(1) fastening the injector inner bolt to a processing tool to ensure that the coaxiality of a clamping part of the processing tool and an excircle of an outlet end of the injector inner bolt fixed on the tool meets the preset requirement; the inner bolt part of the injector is positioned through a positioning part (a boss C surface), the inner bolt part is completely attached to a positioning part (a B surface) of the special fixing and clamping tool, hole positions of 8 screw holes are aligned, and the inner bolt part is fastened on the special fixing and clamping tool through screws.
(2) And clamping the machining tool after fastening the inner bolt of the injector on a precision dividing head of the linear cutting equipment, and aligning the alignment part of the machining tool. The method specifically comprises the following steps: adjusting a linear cutting machine tool, fixing a dial indicator at a proper position of the linear cutting machine tool by using a clamping part A surface (a clamping part) of a special fixing and clamping tool for index head three-jaw clamping, striking a dial indicator to align the excircle of a microgroove structure part needing to be machined on an injector inner bolt part, finely adjusting the position of the inner bolt by adjusting a fastening screw, ensuring that the excircle of the microgroove structure part jumps within 0.01mm, and then screwing the fastening screw.
(3) And aligning the outlet end of the inner plug of the injector. The method specifically comprises the following steps: and measuring whether the coaxiality of the outlet end of the inner bolt of the injector and the clamping end is within 0.01mm, if so, determining that the outlet end of the inner bolt of the injector is aligned, otherwise, finely adjusting the relative position of the mounting flange of the inner bolt and the joint part of the alignment part of the machining tool until the coaxiality of the outlet end of the inner bolt of the injector and the clamping end is within 0.01 mm.
(4) And finding the original position of the outlet end of the inner plug of the wire electrode cutting injector by using a discharge opposite side alignment method, and cutting the micro-groove structure in a linear mode. The method specifically comprises the following steps:
(4.1) placing the wire electrode of the linear cutting equipment near the end face of the outlet end of the bolt;
(4.2) connecting a meter pen on one side of the multimeter with the electrode wire, and connecting a meter pen on the other side of the multimeter with an injector inner bolt, as shown in fig. 4;
(4.3) turning on a pulse power supply of the linear cutting equipment, placing the universal meter in an ohmic gear, enabling the internal bolt part and the electrode wire to approach by using a manual control box or an operation panel for measurement, moving the electrode wire to the end face of the internal bolt by using the manual control box or the operation panel to ensure good contact, and enabling a pointer of the universal meter to be positioned on the rightmost side;
(4.4) moving the wire electrode to be close to the end face of the outlet end of the inner bolt at the speed of 0.002mm each time by adopting a manual control box or an operation panel until the wire electrode is contacted with the end face of the outlet end of the inner bolt;
(4.5) when the pointer of the multimeter swings greatly, namely the multimeter changes from open circuit to short circuit, the electrode wire is instantly connected with the end face of the outlet end of the inner bolt, and the position of the electrode wire at the moment is set as the original point position of the electrode wire;
(4.6) and a plurality of steps (4.4) to (4.6), confirming that the end face position of the outlet end of the inner plug of the injector is the original point position of the wire electrode; after multiple times of alignment, the maximum error is 0.004mm, and the alignment requirement of uniformly distributed microgrooves during processing can be met.
It is worth noting that: and (4) before the measurement in the steps (4.4) to (4.6), a pulse power supply of the linear cutting equipment is turned off, two meter pens of the multimeter are touched together, when the end face of the outlet end of the inner plug of the injector is instantly contacted with the electrode wire, a pointer of the multimeter is aligned to zero, the end face of the outlet end of the inner plug of the injector is in short circuit with the electrode wire, and redundant electric quantity is released to avoid damaging the multimeter. The edge of the wire electrode is just contacted, and the radius compensation of the wire electrode is needed after the edge is found, so that the high-precision requirement of the verticality of the wire electrode and the structure of the micro-groove and the precise position of the wire electrode relative to the inner bolt of the injector are ensured.
(4.7) carrying out linear cutting machining on a first pair of micro-groove structures according to the original point position of the wire electrode and the size requirements of the micro-grooves;
the linear cutting equipment is micro-electro-machining equipment, the feeding amount of a servo system of the linear cutting equipment can be controlled within a micron-sized range, the machining precision is within 5 mu m, and the working box liquid is preferably basorepi LM electro-machining liquid.
The electrical parameter selection of the wire-electrode cutting micro-groove structure adopts an orthogonal test method, process index factors influencing wire-electrode cutting processing are selected by combining processing experience, test data points are uniformly distributed, an orthogonal test is set, a wire-electrode cutting motion track is programmed, electrical processing parameters including electrode polarity, discharge waveform, pulse width, pulse interval, feeding speed, peak current and the like are preset, a preliminary test is carried out, various electrical parameters are continuously optimized, and the requirements of the size precision and the surface roughness of the micro-groove structure are met.
The electrical machining parameters with better reliability are as follows: electrode polarity, positive polarity; discharge waveform, rectangular; pulse width, 1-3 μ s; the pulse interval is 18-20 mu s; spinning speed: 1-1.2 m/s; feeding speed: 0.6 to 1; the peak current is 0.8-1.2A.
(4.8) after the first pair of micro-groove structures are machined, the dividing head is rotated, the steps (4.1) to (4.8) are repeated, and the next pair of micro-groove structures are machined until all the micro-groove structures are machined.
Example (b):
the special tool for clamping the inner bolt part is used for aligning the excircle of the inner bolt to 0.01mm by using the design, aligning the electrode wire to 0.003mm, and designing the linear cutting machining parameters as follows: electrode polarity, positive polarity; discharge waveform, rectangular; pulse width, 2 μ s; the pulse interval is 18 mus; spinning speed: 2 m/s; feeding speed: 1; peak current 1A.
The implementation effect is as follows: the microgroove structure of 36 internal bolt parts observed and processed under a high-power imager has better dimensional accuracy and consistency.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (5)
1. A method for processing a micro-groove structure at the outlet end of an injector inner bolt of an engine comprises the steps that the micro-groove structure is uniformly distributed on the end face of the outlet end of the injector inner bolt along the circumferential direction, the direction of the outlet end of the injector inner bolt is perpendicular to an installation flange, the end face of the outlet end of the injector inner bolt is parallel to the bottom surface of the installation flange, the outer contour of the installation flange is of a non-circular structure, a concave hole is formed in the center of the back face of the installation flange and corresponds to the outlet end of the injector inner bolt, and; the method is characterized by comprising the following steps:
(1) fastening the injector inner bolt to a processing tool to ensure that the coaxiality of a clamping part of the processing tool and an excircle of an outlet end of the injector inner bolt fixed on the tool meets the preset requirement; the tool comprises a cylindrical alignment part, wherein bosses are respectively arranged on two sides of the alignment part, the boss on one side is marked as a clamping part and used for clamping the tool on the wire cutting equipment, the boss on the other side is marked as a positioning part, the outer surface of the positioning part is tightly matched with a central concave hole of a mounting flange and used for fixing an inner bolt of an injector on the tool, the clamping part, the alignment part and the positioning part are coaxial, and the bottom surface of the alignment part is perpendicular to the cylindrical surface of the clamping part; the perpendicularity between the side surface of the clamping part of the tool and the bottom surface of the alignment part is within 0.01; the flatness of the joint surface of the alignment part of the tool and the flange surface of the inner bolt of the injector is guaranteed to be within 0.01 mm; the coaxiality of the clamping part, the alignment part and the positioning part is within 0.01 mm; the clamping part, the aligning part and the positioning part are integrally formed and processed, and the aligning part is provided with 8 screw holes and is used for installing an flange with a non-circular outer contour;
the method comprises the following specific steps: positioning the outlet end of an inner bolt of the injector through a positioning part, simultaneously completely attaching the outlet end of the inner bolt to a tool alignment part, aligning hole positions of 8 screw holes, and mounting an installation flange with a non-circular outer contour by using screws;
(2) clamping the machining tool after fastening the inner bolt of the injector on a precision dividing head of the linear cutting equipment, and aligning an alignment part of the machining tool; the method specifically comprises the following steps: adjusting a linear cutting machine tool, fixing a dial indicator at a proper position of the linear cutting machine tool by using a clamping part of a dividing head three-jaw clamping tool, striking the dial indicator to align the outer circle of the micro-groove structure to be machined at the outlet end of an inner bolt of an injector, finely adjusting the position of the inner bolt by adjusting a fastening screw to ensure that the outer circle of the micro-groove structure jumps within 0.01mm, and then screwing the fastening screw;
(3) aligning the outlet end of the inner bolt of the injector; the method specifically comprises the following steps: measuring whether the coaxiality of the outlet end of the inner bolt of the injector and the clamping end is within 0.01mm, if so, determining that the outlet end of the inner bolt of the injector is aligned, otherwise, finely adjusting the relative position of the mounting flange of the inner bolt and the joint part of the alignment part of the processing tool until the coaxiality of the outlet end of the inner bolt of the injector and the clamping end is within 0.01 mm;
(4) and finding the original position of the outlet end of the inner plug of the wire electrode cutting injector by using a discharge opposite side alignment method, and cutting the micro-groove structure in a linear mode.
2. The method for processing the micro-groove structure at the outlet end of the engine injector inner bolt according to claim 1, wherein the specific method in the step (4) is as follows:
(4.1) placing a wire electrode of a linear cutting device near the end face of the outlet end of the inner plug;
(4.2) connecting a meter pen on one side of the universal meter with the electrode wire, and connecting a meter pen on the other side of the universal meter with an injector inner bolt;
(4.3) turning on a pulse power supply of the wire cutting equipment, and placing the universal meter at an ohmic gear, wherein the pointer of the universal meter is positioned at the rightmost side;
(4.4) moving the wire electrode to enable the wire electrode to be close to the end face of the outlet end of the inner bolt until the wire electrode is contacted with the end face of the outlet end of the inner bolt;
(4.5) when the pointer of the universal meter swings greatly, namely the universal meter changes from open circuit to short circuit, and the position of the electrode wire at the moment is set as the original position of the electrode wire;
(4.6) and a plurality of steps (4.4) to (4.6), confirming that the end face position of the outlet end of the inner bolt of the injector is the original position of the wire electrode;
(4.7) carrying out linear cutting machining on a first pair of micro-groove structures according to the original point position of the wire electrode, the size requirement of the micro-grooves and optimized linear cutting process parameters;
(4.8) after the first pair of micro-groove structures are machined, the dividing head is rotated, the steps (4.1) to (4.8) are repeated, and the next pair of micro-groove structures are machined until all the micro-groove structures are machined.
3. The method for machining the micro-groove structure at the outlet end of the engine injector inner bolt is characterized in that the following steps are added after the step (4.2):
and closing a pulse power supply of the linear cutting equipment, and touching two meter pens of the universal meter together, so that the end face of the outlet end of the inner plug of the injector is in short circuit with the electrode wire, and redundant electric quantity is released to avoid damaging the universal meter.
4. The method for processing the micro-groove structure at the outlet end of the inner bolt of the engine injector according to claim 1, wherein the linear cutting equipment is micro-electro-machining equipment, the feeding amount of a servo system of the linear cutting equipment can be controlled within a micron-sized range, the processing precision is within 5 μm, and the working fluid is Barso Sorepi LM electro-machining fluid.
5. The method for processing the micro-groove structure at the outlet end of the inner bolt of the engine injector according to claim 1, wherein the step (3) is realized by the following steps: and measuring whether the coaxiality of the outlet end of the inner bolt of the injector and the clamping end is within 0.01mm, if so, determining that the outlet end of the inner bolt of the injector is aligned, otherwise, finely adjusting the relative position of the mounting flange of the inner bolt and the joint part of the alignment part of the machining tool until the coaxiality of the outlet end of the inner bolt of the injector and the clamping end is within 0.01 mm.
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