CN112171203A - Machining method of microporous spray pipe - Google Patents
Machining method of microporous spray pipe Download PDFInfo
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- CN112171203A CN112171203A CN202011037488.7A CN202011037488A CN112171203A CN 112171203 A CN112171203 A CN 112171203A CN 202011037488 A CN202011037488 A CN 202011037488A CN 112171203 A CN112171203 A CN 112171203A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
- B23B27/06—Profile cutting tools, i.e. forming-tools
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Abstract
The invention discloses a method for processing a micropore spray pipe. The method comprises the steps of material preparation, flaw detection, turning, centerless external grinding, circular grinding, flat grinding, a first-time numerical control lathe, a second-time numerical control lathe and a third-time numerical control lathe. According to the machining method of the micro-hole spray pipe, the machining of the high-precision micro deep hole represented by the micro-hole spray pipe is realized by adopting the most economical and efficient means through reasonable process flow and designing the special tool and cutter for machining, the machining method has the advantages of low cost and high efficiency, the consistency of a group of micro-hole spray pipes is ensured, and reference significance is provided for machining similar high-precision micro deep hole workpieces.
Description
Technical Field
The invention belongs to the technical field of machining, and particularly relates to a machining method of a micropore spray pipe.
Background
In order to improve aerodynamic efficiency and stealth efficiency of supersonic cruising of a fighter plane and obtain optimal aerodynamic efficiency of internal and external flows, thrust vector tests of jet pipes with different skewness are required to be carried out in a wind tunnel. In order to improve the maneuvering performance of supersonic speed, particularly the turning performance, a fighter plane adopts vector control and needs to perform a thrust vector test in a wind tunnel.
The microporous nozzle is a key part for carrying out a wind tunnel thrust vector test, and the microporous nozzle is used for accelerating airflow to a jet flow speed required by the test. The machining precision of the micropore spray pipe has a decisive effect on whether the aircraft wind tunnel thrust vector test is successful or not.
The existing micropore machining method mainly comprises drilling, electric spark machining, electrolytic machining, ultrasonic machining, laser machining, electron beam machining and the like. The hardness of the micropore spray pipe material used in the wind tunnel thrust vector test is higher, and the drilling machining efficiency is not high; the precision of holes machined by electric spark machining and electrolysis is not high, and the taper is easy to appear; ultrasonic machining requires an ultrasonic vibration tool and a liquid medium with an abrasive, which is uneconomical; laser processing is adopted, the laser equipment is high in price, the surface roughness of the processed hole is large, and a horn mouth is easily formed due to poor roundness; the use of electron beams requires a vacuum environment, and the system is costly and uneconomical.
The processing difficulty of the micropore spray pipe is mainly reflected in the following points:
1. the coaxiality between the taper holes at the two ends of the microporous nozzle pipe and the throat is difficult to ensure;
2. the coaxiality detection difficulty of the inner molded surface of the micropore spray pipe and the reference excircle is very high;
3. the throat of the micropore spray pipe is difficult to process, and the size of the throat of the obtained machined part is difficult to accurately measure;
4. the lengths of the conical surfaces at the two ends of the microporous spray pipe are not easy to control accurately;
5. the parallelism of two end surfaces of the microporous nozzle is difficult to ensure;
6. the cylindricity of the outer cylinder of the microporous spray pipe is difficult to ensure;
7. the shape consistency of a group of micropore spray pipes is difficult to guarantee.
At present, the micropore spray pipes urgently needed by a wind tunnel thrust vector test are a group of micropore spray pipes with the same size and the length-diameter ratio of which is greater than 5, the shapes of the group of micropore spray pipes are required to be consistent and can be used interchangeably, and the difficulty in processing the group of micropore spray pipes is higher than that in processing one micropore spray pipe alone.
Currently, there is a need to develop a method for machining a micro-orifice nozzle.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for processing a micropore spray pipe.
The machining method of the micro-hole spray pipe comprises the following steps:
a. preparing materials; choose to use
H62 bar I;
b. flaw detection; carrying out ultrasonic flaw detection according to JB4730.3-2005 standard, and requiring that the bar stock I reaches II-level qualified index;
c. turning; roughly processing a bar I to obtain a bar II, wherein the excircle diameter of the bar II is
The length is 55.3 +/-0.1, the chamfers at the two ends are 1.5 multiplied by 45 degrees, the central holes at the two ends are A0.5, and the coaxiality is 0.05;
d. centerless grinding of the excircle; roughly grinding the excircle of the bar II by using a centerless grinding machine to obtain a bar III, wherein the excircle diameter of the bar III is
The roughness Ra0.8 is above;
e. grinding; clamping and positioning the bar III by using a clamp, aligning the outer circle of the bar III, wherein the tolerance is 0.005, finely grinding 60-degree contact surfaces of center holes at two ends of the bar III on a numerical control lathe, and obtaining a bar IV by requiring the roughness Ra0.8 of the 60-degree contact surfaces, the roundness to be more than 0.001 and the coaxiality to be more than 0.002;
f. circular grinding; circularly grinding a bar material IV on an outer circular grinding machine to obtain a bar material V, wherein the outer circular diameter of the bar material V is
The cylindricity is more than 0.001, and the roughness is more than Ra0.8;
g. flat grinding; fixing a bar material V by adopting a zero-order V-shaped block, and flatly grinding two end faces of the bar material V on a surface grinding machine to obtain a bar material VI, wherein the length of the bar material VI is 55 +/-0.002, the perpendicularity between the end face and the excircle is more than 0.001, the parallelism of the two end faces is more than 0.001, and the roughness Ra0.8 is more than;
h. a first numerical control lathe: clamping and positioning a bar VI by using a clamp, aligning the outer circle, and allowing the tolerance to be 0.005, respectively machining taper holes at two ends on a numerical control lathe, and putting machining allowance of 0.15-0.2 mm on the diameter of each taper hole to obtain a bar VII;
i. a second numerically controlled lathe; clamping and positioning the bar VII by using a clamp, aligning the outer circle and the end face, wherein the tolerance is 0.001, and machining a 15-degree taper hole on a numerical control lathe by using a 15-degree taper cutter, wherein the tolerance is +/-0.01 to obtain a bar VIII; turning a bar VIII, clamping and positioning the bar VIII by adopting a clamp, aligning an excircle and an end face, wherein the tolerance is 0.001, machining a 21-degree taper hole by adopting a 21-degree conical cutter, wherein the same cylindricity of the 21-degree taper hole and a 15-degree taper hole is more than 0.002, the tolerance is +/-0.01, and the roughness is more than Ra0.8; then processing a throat, wherein the diameter of the throat is 0.189 mm; obtaining a bar stock IX;
j. a third time of numerically controlled lathe; respectively penetrating a 15-degree core shaft and a 21-degree core shaft into two ends of a bar IX, tightly pushing center holes of the 15-degree core shaft and the 21-degree core shaft by a tip, aligning an outer circle and an end face, enabling a tolerance to be 0.001, processing the outer circle of the bar IX to reach the size required by a drawing, processing the two end faces to reach the length required by the drawing, processing sealing grooves of the two end faces to reach the drawing requirement, and finishing the processing.
The processing method of the microporous nozzle pipe aims at detecting the distribution condition of cracks and defects in the bar stock, removing unqualified bar stock and selecting qualified bar stock.
According to the machining method of the micro-hole spray pipe, the machining of the high-precision micro deep hole represented by the micro-hole spray pipe is realized by adopting the most economical and efficient means through reasonable process flow and designing the special tool and cutter for machining, the machining method has the advantages of low cost and high efficiency, the consistency of a group of micro-hole spray pipes is ensured, and reference significance is provided for machining similar high-precision micro deep hole workpieces.
Drawings
FIG. 1 is a view of a micro-orifice nozzle machined using the micro-orifice nozzle machining method of the present invention;
FIG. 2 is a process diagram of step c of the method of forming a micro-orifice nozzle of the present invention;
FIG. 3 is a process diagram of step h of the method of forming a micro-orifice nozzle of the present invention;
FIG. 4a is a 15 degree conical cutter at step i of the method of machining a micro-orifice nozzle of the present invention;
FIG. 4b is a 15 degree conical cutter (A-A cross section) of step i of the method of the present invention;
FIG. 5a is a 21 degree conical cutter at step i of the method of machining a micro-orifice nozzle of the present invention;
FIG. 5b is a cross-sectional view A-A of the 21 degree conical cutter of step i of the method of the present invention;
FIG. 6 is a 15 degree mandrel at step j of the method of machining a micro-orifice nozzle of the present invention;
FIG. 7 is a 21 degree mandrel at step j of the method of forming a micro-orifice nozzle of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
Example 1
This example was processed to obtain a micro-orifice nozzle as shown in figure 1.
The processing procedure of this example is as follows:
a. preparing materials; choose to use
H62 bar I;
b. flaw detection; carrying out ultrasonic flaw detection according to JB4730.3-2005 standard, and requiring that the bar stock I reaches II-level qualified index;
c. turning; roughly processing a bar I to obtain a bar II, wherein the excircle diameter of the bar II is
The length is 55.3 +/-0.1, the chamfers at the two ends are 1.5 multiplied by 45 degrees, the central holes at the two ends are A0.5, and the coaxiality is 0.05; the process diagram of the step is shown in figure 2;
d. centerless grinding of the excircle; roughly grinding the excircle of the bar II by using a centerless grinding machine to obtain a bar III, wherein the excircle diameter of the bar III is
The roughness Ra0.8 is above;
e. grinding; clamping and positioning the bar III by using a clamp, aligning the outer circle of the bar III, wherein the tolerance is 0.005, finely grinding 60-degree contact surfaces of center holes at two ends of the bar III on a numerical control lathe, and obtaining a bar IV by requiring the roughness Ra0.8 of the 60-degree contact surfaces, the roundness to be more than 0.001 and the coaxiality to be more than 0.002;
f. circular grinding; circularly grinding a bar material IV on an outer circular grinding machine to obtain a bar material V, wherein the outer circular diameter of the bar material V is
The cylindricity is more than 0.001, and the roughness is more than Ra0.8;
g. flat grinding; fixing a bar material V by adopting a zero-order V-shaped block, and flatly grinding two end faces of the bar material V on a surface grinding machine to obtain a bar material VI, wherein the length of the bar material VI is 55 +/-0.002, the perpendicularity between the end face and the excircle is more than 0.001, the parallelism of the two end faces is more than 0.001, and the roughness Ra0.8 is more than;
h. a first numerical control lathe: clamping and positioning a bar VI by using a clamp, aligning the outer circle, and allowing the tolerance to be 0.005, respectively machining taper holes at two ends on a numerical control lathe, and putting machining allowance of 0.15-0.2 mm on the diameter of each taper hole to obtain a bar VII; the process diagram of this step is shown in FIG. 3;
i. a second numerically controlled lathe; clamping and positioning the bar VII by using a clamp, aligning the outer circle and the end face, wherein the tolerance is 0.001, and machining a 15-degree taper hole on a numerical control lathe by using a 15-degree taper cutter as shown in figures 4a and 4b, wherein the tolerance is +/-0.01 to obtain a bar VIII; turning a bar VIII, clamping and positioning the bar VIII by adopting a clamp, aligning an excircle and an end face, wherein the tolerance is 0.001, and machining a 21-degree taper hole by adopting a 21-degree taper cutter shown in figures 5a and 5b, wherein the same cylindricity of the 21-degree taper hole and a 15-degree taper hole is more than 0.002, the tolerance is +/-0.01, and the roughness is more than 0.8; then processing a throat, wherein the diameter of the throat is 0.189 mm; obtaining a bar stock IX;
j. a third time of numerically controlled lathe; respectively penetrating a 15-degree core shaft shown in a figure 6 and a 21-degree core shaft shown in a figure 7 into two ends of a bar stock IX, tightly pushing center holes of the 15-degree core shaft and the 21-degree core shaft by a center, aligning an excircle and an end face, enabling a tolerance to be 0.001, processing the excircle of the bar stock IX to reach the size required by a drawing, processing two end faces to reach the length required by the drawing, processing sealing grooves of the two end faces to reach the drawing requirement, and finishing the processing.
Claims (1)
1. The machining method of the micro-hole spray pipe is characterized by comprising the following steps of:
a. preparing materials; choose to use
H62 bar I;
b. flaw detection; carrying out ultrasonic flaw detection according to JB4730.3-2005 standard, and requiring that the bar stock I reaches II-level qualified index;
c. turning; roughly processing a bar I to obtain a bar II, wherein the excircle diameter of the bar II is
The length is 55.3 +/-0.1, the chamfers at the two ends are 1.5 multiplied by 45 degrees, the central holes at the two ends are A0.5, and the coaxiality is 0.05;
d. centerless grinding of the excircle; roughly grinding the excircle of the bar II by using a centerless grinding machine to obtain a bar III, wherein the excircle diameter of the bar III is
The roughness Ra0.8 is above;
e. grinding; clamping and positioning the bar III by using a clamp, aligning the outer circle of the bar III, wherein the tolerance is 0.005, finely grinding 60-degree contact surfaces of center holes at two ends of the bar III on a numerical control lathe, and obtaining a bar IV by requiring the roughness Ra0.8 of the 60-degree contact surfaces, the roundness to be more than 0.001 and the coaxiality to be more than 0.002;
f. circular grinding; circularly grinding a bar material IV on an outer circular grinding machine to obtain a bar material V, wherein the outer circular diameter of the bar material V is
The cylindricity is more than 0.001, and the roughness is more than Ra0.8;
g. flat grinding; fixing a bar material V by adopting a zero-order V-shaped block, and flatly grinding two end faces of the bar material V on a surface grinding machine to obtain a bar material VI, wherein the length of the bar material VI is 55 +/-0.002, the perpendicularity between the end face and the excircle is more than 0.001, the parallelism of the two end faces is more than 0.001, and the roughness Ra0.8 is more than;
h. a first numerical control lathe: clamping and positioning a bar VI by using a clamp, aligning the outer circle, and allowing the tolerance to be 0.005, respectively machining taper holes at two ends on a numerical control lathe, and putting machining allowance of 0.15-0.2 mm on the diameter of each taper hole to obtain a bar VII;
i. a second numerically controlled lathe; clamping and positioning the bar VII by using a clamp, aligning the outer circle and the end face, wherein the tolerance is 0.001, and machining a 15-degree taper hole on a numerical control lathe by using a 15-degree taper cutter, wherein the tolerance is +/-0.01 to obtain a bar VIII; turning a bar VIII, clamping and positioning the bar VIII by adopting a clamp, aligning an excircle and an end face, wherein the tolerance is 0.001, machining a 21-degree taper hole by adopting a 21-degree conical cutter, wherein the same cylindricity of the 21-degree taper hole and a 15-degree taper hole is more than 0.002, the tolerance is +/-0.01, and the roughness is more than Ra0.8; then processing a throat, wherein the diameter of the throat is 0.189 mm; obtaining a bar stock IX;
j. a third time of numerically controlled lathe; respectively penetrating a 15-degree core shaft and a 21-degree core shaft into two ends of a bar IX, tightly pushing center holes of the 15-degree core shaft and the 21-degree core shaft by a tip, aligning an outer circle and an end face, enabling a tolerance to be 0.001, processing the outer circle of the bar IX to reach the size required by a drawing, processing the two end faces to reach the length required by the drawing, processing sealing grooves of the two end faces to reach the drawing requirement, and finishing the processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011037488.7A CN112171203A (en) | 2020-09-28 | 2020-09-28 | Machining method of microporous spray pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011037488.7A CN112171203A (en) | 2020-09-28 | 2020-09-28 | Machining method of microporous spray pipe |
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| CN112171203A true CN112171203A (en) | 2021-01-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011037488.7A Pending CN112171203A (en) | 2020-09-28 | 2020-09-28 | Machining method of microporous spray pipe |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112809323A (en) * | 2021-01-26 | 2021-05-18 | 中国空气动力研究与发展中心超高速空气动力研究所 | Manufacturing process of axisymmetric nozzle of conventional hypersonic wind tunnel |
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| CN103464846A (en) * | 2013-09-10 | 2013-12-25 | 湖北三江航天江北机械工程有限公司 | Method for machining circumferential taper holes in irregular spraying pipe casing and composite clamp thereof |
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| CN111590097A (en) * | 2020-06-23 | 2020-08-28 | 张家港玉成精机股份有限公司 | Deep hole processing cutter |
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2020
- 2020-09-28 CN CN202011037488.7A patent/CN112171203A/en active Pending
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| US8322127B2 (en) * | 2007-11-01 | 2012-12-04 | United Technologies Corporation | Nozzle assembly with flow conduits |
| CN103464846A (en) * | 2013-09-10 | 2013-12-25 | 湖北三江航天江北机械工程有限公司 | Method for machining circumferential taper holes in irregular spraying pipe casing and composite clamp thereof |
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| CN111347104A (en) * | 2020-03-24 | 2020-06-30 | 中国空气动力研究与发展中心超高速空气动力研究所 | Machining method for improving size precision of hypersonic wind tunnel nozzle interface |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112809323A (en) * | 2021-01-26 | 2021-05-18 | 中国空气动力研究与发展中心超高速空气动力研究所 | Manufacturing process of axisymmetric nozzle of conventional hypersonic wind tunnel |
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Application publication date: 20210105 |