CN111299769B - Manufacturing process of unmanned aerial vehicle engine support - Google Patents

Manufacturing process of unmanned aerial vehicle engine support Download PDF

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Publication number
CN111299769B
CN111299769B CN202010147999.8A CN202010147999A CN111299769B CN 111299769 B CN111299769 B CN 111299769B CN 202010147999 A CN202010147999 A CN 202010147999A CN 111299769 B CN111299769 B CN 111299769B
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China
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support
clamp
mounting
positioning plate
positioning
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CN111299769A (en
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王�忠
杨光
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Chengdu Kaihang Automation Complete Equipment Co ltd
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Chengdu Kaihang Automation Complete Equipment Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/16—Arc welding or cutting making use of shielding gas
    • B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
    • B23K37/0426—Fixtures for other work
    • B23K37/0435—Clamps
    • B23K37/0443—Jigs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/32—Accessories

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)

Abstract

The invention relates to the field of unmanned aerial vehicle manufacturing, in particular to a manufacturing process of an unmanned aerial vehicle engine support, which comprises the following steps: preparing parts and fixtures for installation according to a digital-analog structure, firstly assembling a tool main body, wherein the tool main body comprises an upright post, an upper positioning plate and a lower positioning plate, two ends of the upright post are respectively connected with the upper positioning plate and the lower positioning plate, the upper positioning plate comprises an upright post mounting hole and a support positioning hole I, the lower positioning plate comprises an upright post mounting hole and a support positioning hole II, and the tool main body is used for limiting the whole space range of a support pipe fitting; then installing a clamp for fixing the space positions of the tooling and the positioning bracket pipe fitting; mounting sleeves at the positions corresponding to the first support positioning hole and the second support positioning hole, and determining the end mounting position of the support pipe fitting; configuring the stent tube according to a specific spatial location structure; and welding the support pipe fitting under the constraint of the tool fixture, and performing heat treatment together to eliminate welding stress to finish the manufacturing of the engine mounting support.

Description

Manufacturing process of unmanned aerial vehicle engine support
Technical Field
The invention relates to the field of unmanned aerial vehicle manufacturing, in particular to a manufacturing process of an unmanned aerial vehicle engine support.
Background
At present, manual assembly welding is adopted for most bracket manufacturing, welding is free of constraint, and a free annealing and stress relieving mode is adopted after welding. The method can not realize the accurate positioning of the main intersection point of the support pipe fitting in the support and the space position of the support pipe fitting, and the welding stress can cause the structural deformation. When the support is subjected to heat treatment, after annealing, deformation can be further generated, and the support is unconstrained, so that the reference is difficult to find in secondary processing.
The process can meet the use requirements of the support which is single in structure, low in requirement on spatial position and low in interchangeability, but the performance requirements of the support which is complex in spatial structure, high in requirement on internal space or high in positioning accuracy cannot be met by adopting the existing manufacturing process, and particularly the process is applied to the field of unmanned aerial vehicle manufacturing.
Disclosure of Invention
The invention aims to: adopt unrestrained artifical group to the welded mode among the prior art to the support, lead to the problem that the spatial position location of support is inaccurate, the error is big, provide a manufacturing process of unmanned aerial vehicle engine support for can be to the main nodical and the position accurate positioning of pipe fitting of support, can wholly keep in certain restraint within range after annealing responds, make things convenient for follow-up processing.
In order to achieve the purpose, the invention adopts the technical scheme that:
a manufacturing process of an unmanned aerial vehicle engine support comprises the following steps:
step 1, preparing parts and fixtures for installation: establishing a three-dimensional model, and preparing each part and clamp with a specific space structure according to a digital-analog structure; the fixture is used for assisting in fixing the tooling and positioning the spatial position of the bracket pipe fitting and an important intersection point of the bracket pipe fitting;
step 2, assembling the tool main body: the tool comprises a combined tool main body, a tool main body and a tool main body, wherein the tool main body comprises a stand column, an upper positioning plate and a lower positioning plate, and two ends of the stand column are respectively connected with the upper positioning plate and the lower positioning plate; the upper positioning plate comprises an upright mounting hole and a support positioning hole I, and the lower positioning plate comprises an upright mounting hole and a support positioning hole II. The upright column, the upper positioning plate and the lower positioning plate are used for limiting the whole space range of the support pipe fitting; a first support positioning hole in the upper positioning plate and a second support positioning hole in the lower positioning plate are used for positioning the end part position of the support pipe fitting and used as a positioning reference of the main intersection point of the engine support; the upright posts play a role in positioning and connecting.
Step 3, installing a clamp: installing a clamp on the tool main body according to the spatial position of the digital-analog structure, wherein the clamp is provided with a first positioning groove, and the first positioning groove is used for matching the position of the fixed support pipe fitting;
step 4, setting an installation sleeve: respectively fixing the mounting sleeves on a first support positioning hole on the upper positioning plate and a second support positioning hole on the lower positioning plate to be used as a reference for positioning the end part of the support pipe fitting; the upper and lower parts are only for the vertical state of the whole tool.
Step 5, configuring a support pipe fitting: corresponding to the spatial position of the first positioning groove in the clamp, fixing the corresponding support pipe fitting in the first positioning groove;
step 6, butt welding of the support pipe fittings: welding the end face groove of the support pipe fitting with the contacted surface to complete the construction and the fixation of the support pipe fitting;
and 7, maintaining the positioning states of the tool main body, the clamp and the support pipe fitting, and carrying out heat treatment on the welded support to eliminate welding internal stress.
When the support is built, the tool and the clamp are used for positioning the key intersection point and the space direction of the support pipe fitting, so that the accurate positioning of the space position of the support is ensured; when the bracket is welded, the welding is carried out under the fixation of a tool clamp, and the welding stress is sealed in the whole tool assembly through the tool and the clamp to form balance; before the welding stress is eliminated, if the support is taken down, the welding stress in the support can be separated from the constraint of the tool, so that the stress is redistributed, deformation is caused, and the situation of tearing of the welding seam can be caused more seriously. Therefore, when the heat treatment is eliminated after welding, the whole bracket and the tool are annealed together, and the assembly precision of the bracket is further ensured.
Wherein step 3 and step 4 are interchangeable.
Preferably, during welding, a tungsten electrode argon arc welding mode is adopted, small currents of 40-70A are adopted, the support pipe fitting is assembled in a spot welding mode from top to bottom under the clamping of the tool main body and the clamp, and then full welding is conducted from inside to outside. And after welding is finished, detecting all welding seams.
Preferably, when the bracket with qualified welding seam quality is subjected to heat treatment, a complete annealing mode in a furnace is adopted; charging at room temperature, heating to 540 ℃ at the heating rate of 160 ℃/h after charging, preserving heat for 1.5 hours at 540 ℃, then cooling to 380 ℃ at 180 ℃/h, and then discharging and air cooling; wherein the temperature difference in the furnace is not more than +/-20 ℃ in the temperature rising stage, and is not more than +/-10 ℃ in the temperature keeping stage. And after the heat treatment is finished, removing the tool clamp, measuring all parts of the support on the scribing platform by using the measuring tool, and recording numerical values.
Furthermore, the invention also comprises an auxiliary machining mounting plate, wherein the auxiliary machining mounting plate comprises a first support positioning hole and a second support positioning hole; after the heat treatment is finished, taking the bracket out of the tool, and fixing one side of the bracket on an auxiliary machining mounting plate; the auxiliary machining mounting plate is arranged on a machining center workbench; defining an original point by taking the first support positioning hole or the second support positioning hole on the auxiliary machining mounting plate as a coordinate, and carrying out secondary machining on a corresponding hole position on the mounting sleeve on the other side of the support; and (5) turning the support, and performing secondary processing on the corresponding hole positions on the rest mounting sleeve. The auxiliary machining mounting plate provides a machining reference for secondary machining of the support, assists related machining instruments to further position and correct the support, further guarantees assembling precision, and does not interfere with accessories on an engine.
Furthermore, after the previous working procedures are completed and qualified, a surface spraying process is carried out, the surface of the processed qualified support is cleaned, and then the primer and the finish paint are sprayed, so that the support performance is favorably improved, and the service life is prolonged.
The support is composed of a plurality of support pipe fittings and a plurality of mounting sleeves, the mounting sleeves are arranged at main intersection points of the support structure, and preferably, the mounting end surfaces of the mounting sleeves are planes; the integral structure of the bracket is in a frustum shape.
Preferably, when the stent tube is configured, the stent tube can be fixed by the pressing plate and the G-shaped clamp. Anchor clamps are square pipes, are equipped with the second constant head tank that matches with the stand, and anchor clamps pass through the gland with the stand and fix mutually, gland and stand adaptation, easily support is built and is fixed a position the installation.
Furthermore, the upper positioning plate and the lower positioning plate are identical in structure and size, and interchangeability is strong.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the invention provides a manufacturing process of an engine bracket of an unmanned aerial vehicle, which adopts the design of a tool and a clamp, can accurately position the main intersection point of a bracket pipe fitting and the space positions of all parts of the bracket when the bracket pipe fitting is welded in a butt joint mode, and restrains stress generated in the welding process.
2. The tool clamp and the bracket are subjected to heat treatment simultaneously, the tool clamp and the bracket can be integrally kept in the constraint range of the tool after annealing and stress relief, the deformation error in the heat treatment stress relief process is constrained, the subsequent secondary processing is convenient, the mounting precision of the bracket is further ensured, and the engine cannot interfere with accessories of the bracket during mounting.
3. The tool is designed to be split, all split parts of the tool can be assembled into a whole through the machined related positioning holes and grooves and the corresponding connecting pieces, and the tool has arbitrary interchangeability, is convenient to install and disassemble, can be used for multiple times, and is low in investment cost and good in economic benefit.
4. The design concept of the bracket manufacturing process provides a new idea for building the bracket space structure with complex space structure, high requirement on internal space and high positioning precision, and has practical significance.
Drawings
FIG. 1 is an assembly schematic of the embodiment.
Fig. 2 is a bottom view of fig. 1.
Fig. 3 is a schematic structural view of the tool main body.
Fig. 4 is a schematic view of the structure of the jig.
Fig. 5 is a schematic structural view of the stent.
FIG. 6 is an auxiliary machining tooling plate.
Fig. 7 is a schematic view of a secondary processing structure.
Icon: 1-a tool main body; 11-upright post; 12-upper positioning plate; 13-lower positioning plate; 2-clamping; 21-a first positioning groove; 22-a second positioning groove; 3-a scaffold; 31-a stent tube; 32-mounting the sleeve; 4-pressing the cover; 5, pressing a plate; 6-auxiliary machining and plate loading; 7-column mounting holes; 81-bracket positioning hole I; 82-bracket positioning hole II.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples
A manufacturing process of an unmanned aerial vehicle engine support comprises the following steps:
step 1, preparing parts and fixtures for installation 2: establishing a three-dimensional model, such as figures 1 and 2, and preparing each part with a specific space structure and a clamp 2 according to a digital-analog structure; the clamp 2 is used for assisting in fixing the space position of the tool and the positioning bracket 3 and important intersection points of the space position;
step 2, assembling the tool main body 1: the combined tool main body 1 is shown in fig. 3, the tool main body 1 comprises an upright post 11, an upper positioning plate 12 and a lower positioning plate 13, and two ends of the upright post 11 are respectively connected with the upper positioning plate 12 and the lower positioning plate 13; the upper positioning plate 12 comprises a column mounting hole 7 and a bracket positioning hole I81, and the lower positioning plate 13 comprises a column mounting hole 7 and a bracket positioning hole II 82. The upper positioning plate 12 and the lower positioning plate 13 define the spatial distance of the bracket 3 by four columns 11. Wherein, the upright post 11 is a two-stage stepped shaft with a large middle and small two ends, and the two end parts are provided with threads; the upper positioning plate 12 and the lower positioning plate 13 are formed by welding Q345 steel plates and are in a frame form, the upright post mounting holes 7 are machined in proper positions according to the overall structure, the upright post mounting holes 7 are distributed in a rectangular shape, and two ends of the four upright posts 11 penetrate through the upright post mounting holes 7 and are fastened by nuts. The upper positioning plate 12 and the lower positioning plate 13 have the same structure and size and can be mounted interchangeably.
Step 3, installing the clamp 2: according to the space position of the digital-analog structure, the clamp 2 is provided with a first positioning groove 21, and the first positioning groove 21 is used for matching the position of the fixed support pipe fitting 31; the clamp 2 is further provided with a second positioning groove 22 matched with the stand column 11, the clamp 2 is fixed on the two adjacent stand columns 11, the clamp 2 and the stand columns 11 are fixed through the pressing cover 4, and the pressing cover 4 is matched with the stand columns 11. The clamp 2 can be a square tube and is easy to install and position. The mounting structure and the body structure of the clamp 2 are shown in figures 1 and 4;
step 4, setting the installation sleeve 32: respectively fixing the mounting sleeve 32 on a first support positioning hole 81 on the upper positioning plate 12 and a second support positioning hole 82 on the lower positioning plate 13, wherein the mounting sleeve 32 is also provided with a corresponding connecting hole position and a secondary machining allowance for an appropriate assembling hole; the mounting sleeve 32 may be machined from a hollow cylinder. The mounting sleeve 32 is used as a reference for positioning the end part of the bracket pipe piece 31; the upper and lower parts are only for the vertical state of the whole tool. The mounting sleeve 32 is detachably connected with the upper positioning plate 12 and the lower positioning plate 13 and is respectively fixed on the upper positioning plate 12 and the lower positioning plate 13 through bolts.
Step 5, configuring the support pipe fitting 31: corresponding to the spatial position of the first positioning groove 21 in the clamp 2, fixing the corresponding support pipe fitting 31 in the first positioning groove 21; the support pipe fitting 31 of inboard can be fixed with anchor clamps 2 looks cramps through clamp plate 5, and clamp plate 5 and 2 bolted connection of anchor clamps, the support pipe fitting 31 of outside can select to press from both sides fixedly through the G according to actual space position.
Step 6, assembling and welding the support pipe fittings 31: the end face bevel of the support pipe 31 is welded to a contact surface, which may be a circumferential surface of the mounting sleeve 32 or a circumferential surface of the support pipe 31. During welding, a tungsten electrode argon arc welding mode is adopted, small currents of 40-70A are adopted, the support pipe fitting 31 is assembled in a spot welding mode from top to bottom under the clamping of the tool main body 1 and the clamp 2, and full welding is conducted from inside to outside. And after welding is finished, detecting all welding seams. The support 3 is composed of a plurality of support pipe fittings 31 and a plurality of mounting sleeves 32, the mounting end surface of each mounting sleeve 32 is a plane, and the whole structure of the support 3 is in a frustum shape, as shown in fig. 5;
and 7, keeping the positioning states of the tool main body 1, the clamp 2 and the bracket 3, and carrying out heat treatment on the welded bracket 3. During heat treatment, a mode of complete annealing in a furnace is adopted; charging at room temperature, heating to 540 ℃ at the heating rate of 160 ℃/h after charging, preserving heat for 1.5 hours at 540 ℃, then cooling to 380 ℃ at 180 ℃/h, and then discharging and air cooling; wherein the temperature difference in the furnace is not more than +/-20 ℃ in the temperature rising stage, and is not more than +/-10 ℃ in the temperature keeping stage. After the heat treatment is finished, the tool clamp is removed, and measuring tools are used for measuring all parts of the support 3 on the scribing platform and recording numerical values.
Wherein step 3 and step 4 are interchangeable.
Further, in order to directly mount the unmanned aerial vehicle engine on the processed bracket 3, secondary processing is performed with the assistance of the auxiliary machining mounting plate 6, the auxiliary machining mounting plate 6 is as shown in fig. 6, and the auxiliary machining mounting plate 6 comprises a bracket positioning hole I81 and a bracket positioning hole II 82; after the heat treatment is finished, taking the bracket 3 out of the tool (comprising the tool main body 1 and the clamp 2), and fixing one side of the bracket on an auxiliary machining mounting plate 6; the auxiliary machining mounting plate 6 is arranged on a machining center workbench; defining an original point by taking a first support positioning hole 81 or a second support positioning hole 82 on the auxiliary machining mounting plate 6 as coordinates, and performing secondary machining on a corresponding hole position on the mounting sleeve 32 on the other side of the support 3; and (5) turning the support, and performing secondary processing on the corresponding hole positions on the rest mounting sleeve 32 until the mounting conditions are met. Fig. 7 is a schematic structural view of the bracket 3 undergoing a secondary processing process. The auxiliary machining mounting plate 6 provides a machining reference for secondary machining of the support 3, assists related machining instruments to further position and correct the support, further guarantees assembling precision, and does not interfere with engine accessories.
And performing surface spraying after the previous processes are completed and qualified. Before spraying, the steel brush and the chiba are used to remove the impurities such as rust on the surface of the bracket 3, and then the cleaning agent is used to remove the greasy dirt on the surface of the bracket 3 and the coloring and displaying agent left after flaw detection. And after the surface is cleaned, spraying a phosphating primer with strong adhesive force, spraying a first finish after the primer is solidified and dried completely, and spraying a second finish after the first finish is dried completely.
In order to ensure the quality of the welding seam of the support without affecting the strength of the welding seam and ensure that the support can be subjected to precise machining at a corresponding position subsequently, the tool main body 1 and the clamp 2 are adopted to accurately align the prefabricated part and the main pipe fitting, when the support pipe fittings 31 are assembled and welded, the main intersection point of the support pipe fittings 31 and the spatial position of the support 3 can be accurately positioned, and the stress generated during welding is restrained; during heat treatment, the annealing stress relief can be integrally kept within the constraint range of the tool after annealing stress relief, so that deformation errors in the heat treatment stress relief process are constrained; and after the completion of the elimination and the qualified flaw detection, secondary machining is carried out on the key positions of the support, the size and the position degree of each key point are ensured, the mounting precision can reach 0.1mm, and the engine is ensured not to interfere with accessories of the engine during mounting.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. The utility model provides a manufacturing process of unmanned aerial vehicle engine support, its characterized in that, support (3) comprise a plurality of support pipe fittings (31) and a plurality of installation cover (32), wherein installation cover (32) are the main nodical of support (3), the overall structure of support (3) is frustum shape, and manufacturing process includes following step:
step 1, preparing parts and fixtures for installation (2): establishing a three-dimensional model, and preparing each part and clamp (2) with a specific space structure according to a digital-analog structure;
step 2, combining the tool main body (1): the tool comprises a combined tool main body (1), wherein the tool main body (1) comprises an upright post (11), an upper positioning plate (12) and a lower positioning plate (13), two ends of the upright post (11) are respectively connected with the upper positioning plate (12) and the lower positioning plate (13), the upper positioning plate (12) comprises an upright post mounting hole (7) and a support positioning hole I (81), and the lower positioning plate (13) comprises an upright post mounting hole (7) and a support positioning hole II (82);
step 3, mounting the clamp (2): according to the space position of a digital-analog structure, the clamp (2) is installed on the tool main body (1), the clamp (2) is provided with a first positioning groove (21), and the first positioning groove (21) is used for matching the position of a fixed support pipe fitting (31);
step 4, setting an installation sleeve (32): fixing a plurality of mounting sleeves (32) on the first support positioning holes (81) on the upper positioning plate (12) and the second support positioning holes (82) on the lower positioning plate (13) respectively;
step 5, configuring a support pipe fitting (31): corresponding to the spatial position of the first positioning groove (21) in the clamp (2), fixing the corresponding support pipe fitting (31) in the first positioning groove (21);
step 6, assembling and welding the support pipe fittings (31): groove welding is carried out on the end face of the support pipe fitting (31); completing the construction and the fixation of the bracket (3);
and 7, maintaining the positioning states of the tool main body (1), the clamp (2) and the support pipe fitting (31), and carrying out heat treatment on the welded support (3).
2. The manufacturing process according to claim 1, characterized in that during welding, a argon tungsten-arc welding mode is adopted, 40-70A current is adopted, the support pipe fitting (31) is assembled in a spot welding mode from top to bottom under the clamping of the tool main body (1) and the clamp (2), and then full welding is carried out from inside to outside.
3. The manufacturing process according to claim 1, wherein the heat treatment is performed by a complete annealing in a furnace; charging at room temperature, heating to 540 ℃ at the heating rate of 160 ℃/h after charging, preserving heat for 1.5 hours at 540 ℃, then cooling to 380 ℃ at 180 ℃/h, and then discharging and air cooling; wherein the temperature difference in the furnace is not more than +/-20 ℃ in the temperature rising stage, and is not more than +/-10 ℃ in the temperature keeping stage.
4. The manufacturing process according to claim 1, further comprising the step of secondary machining of the support (3) by means of an auxiliary machining mounting plate (6), in particular: the auxiliary machining plate (6) comprises a first support positioning hole (81) and a second support positioning hole (82); after the heat treatment is finished, taking the bracket (3) out of the tool, and fixing one side of the bracket on the auxiliary machining mounting plate (6); the auxiliary machining mounting plate (6) is arranged on a machining center workbench; defining an origin point by taking the first support positioning hole (81) or the second support positioning hole (82) on the auxiliary machining mounting plate (6) as a coordinate, and performing secondary machining on a corresponding hole position on the mounting sleeve 32 on the other side of the support (3); and (3) overturning the support (3) and carrying out secondary processing on the corresponding hole positions on the rest mounting sleeve 32.
5. The manufacturing process of claim 4, further comprising a surface spray coating process: and cleaning the surface of the qualified bracket (3), and then spraying primer and finish paint.
6. The manufacturing process according to any one of claims 1 to 5, wherein step 3 and step 4 are interchanged.
7. A manufacturing process according to any one of claims 1 to 5, characterised in that the mounting end face of the mounting sleeve (32) is planar.
8. The manufacturing process according to any one of claims 1 to 5, wherein in step 5, when the stent tube (31) is configured, the stent tube (31) is fixed on the jig (2) by a pressing plate (5) and a G-clamp, and the pressing plate (5) has a rectangular shape.
9. The manufacturing process according to any one of claims 1 to 5, characterized in that the clamp (2) is a square tube provided with a second positioning groove (22) matched with the upright (11), the clamp (2) and the upright (11) are fixed by a gland (4), and the gland (4) is matched with the upright (11).
10. Manufacturing process according to any one of claims 1 to 5, characterized in that the upper positioning plate (12) and the lower positioning plate (13) are of identical construction and dimensions.
CN202010147999.8A 2020-03-05 2020-03-05 Manufacturing process of unmanned aerial vehicle engine support Active CN111299769B (en)

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FR2008967A6 (en) * 1968-05-21 1970-01-30 Schottl Lorenz
CN203019262U (en) * 2013-01-30 2013-06-26 成都大漠石油机械有限公司 Pressing plate structure capable of increasing contact area
KR101335519B1 (en) * 2013-07-15 2013-12-02 한국플랜트서비스주식회사 Rotor supporting device for power generation
CN204545785U (en) * 2015-02-04 2015-08-12 象山星旗电器科技有限公司 A kind of positioner of GND ear
CN105081643B (en) * 2015-08-21 2016-09-28 莱芜钢铁集团有限公司 The middle frame blank production labor dress of withdrawal straightening machine and method
CN207289317U (en) * 2017-10-19 2018-05-01 京信通信系统（中国）有限公司 Positioning fixture for welding
CN209552090U (en) * 2018-09-30 2019-10-29 湖南东方红住宅工业有限公司 A kind of prefabricated beam stirrup positioning tool

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