CN114346717A - Fixture combination for controlling machining deformation of single-side slotted thin-wall waveguide cavity - Google Patents
Fixture combination for controlling machining deformation of single-side slotted thin-wall waveguide cavity Download PDFInfo
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- CN114346717A CN114346717A CN202111583374.7A CN202111583374A CN114346717A CN 114346717 A CN114346717 A CN 114346717A CN 202111583374 A CN202111583374 A CN 202111583374A CN 114346717 A CN114346717 A CN 114346717A
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- deep groove
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- 238000003754 machining Methods 0.000 title claims abstract description 35
- 238000003801 milling Methods 0.000 claims abstract description 52
- 238000010438 heat treatment Methods 0.000 claims abstract description 31
- 238000003825 pressing Methods 0.000 claims description 24
- 230000032683 aging Effects 0.000 claims description 4
- 238000004881 precipitation hardening Methods 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 229910000838 Al alloy Inorganic materials 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- 230000035882 stress Effects 0.000 description 3
- 238000010923 batch production Methods 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000000137 annealing Methods 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The invention relates to a clamp combination for controlling machining deformation of a single-side slotted thin-wall waveguide cavity, which comprises a back deep groove milling clamp, a front oblique slot milling clamp and a correction heat treatment shape-preserving clamp. According to the structural characteristics of the parts, corresponding profile modeling limit clamps are provided for deep groove milling, inclined seam milling and final heat treatment processes, the rigidity of the asymmetric thin-wall cavity type parts is improved, the machining deformation is inhibited, and the machining efficiency and the product percent of pass are improved.
Description
Technical Field
The invention relates to the technical field of precision machining of waveguide components, in particular to a clamp combination for controlling machining deformation of a single-side slotted thin-wall waveguide cavity.
Background
The crack waveguide component formed by processing and welding aluminum alloy thin-wall high-precision parts is an important component in a satellite-borne radar antenna feeder system, the manufacturing process is complex, the processing difficulty is high, and the processing and manufacturing precision of a thin-wall waveguide cavity is directly closely related to the telecommunication performance index of a product.
The traditional technical scheme for cutting and machining the aluminum alloy thin-wall precision part adopts gradual and successive cutting, and a plurality of stress relief heat treatment processes are arranged in the process, so that the production efficiency is low, and the requirement on the skill of an operator is high. For the single-side slotted thin-wall waveguide cavity part, the wall thickness of the part is less than 0.8mm, the precision requirement is 0.03mm, the non-pair type single-side slotted groove structure design is easy to generate warping deformation, a deformation clamp combination needs to be developed and controlled, the production efficiency and the product percent of pass are improved, and the requirement of batch production is met.
Disclosure of Invention
Aiming at the problem that a high-precision single-side slotted thin-wall waveguide cavity is difficult to form, the invention provides the clamp combination for controlling the machining deformation of the single-side slotted thin-wall waveguide cavity, so that the dimensional precision and the surface quality of thin-wall, high-precision and low-rigidity aluminum alloy waveguide cavity parts are ensured, and the batch manufacturing of the type of slotted waveguide can be realized.
In order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows:
a clamp combination for controlling machining deformation of a single-side slotted thin-wall waveguide cavity comprises a back deep groove milling clamp, a front oblique slot milling clamp and a correction heat treatment shape-preserving clamp, wherein the back deep groove milling clamp consists of a milling deep groove clamp bottom plate and a milling deep groove clamp pressing plate, the milling deep groove clamp bottom plate is provided with three transverse and three longitudinal limiting bosses, the characteristic width of each boss is equivalent to the characteristic width of the front slotting of a waveguide cavity rough machining structural member 1, the theoretical design gap is 0.02mm, and the boss is matched and attached to a waveguide cavity rough machining blank so as to facilitate back thin-wall deep groove milling; the oblique seam milling clamp consists of an oblique seam milling clamp bottom plate and an oblique seam milling clamp pressing plate, the oblique seam milling clamp bottom plate is provided with an oblique seam limiting boss, the characteristic width of the boss is equivalent to that of a deep groove on the back of a waveguide cavity finish machining part, the theoretical design gap is 0.02mm, the oblique seam milling clamp is matched and attached to the deep groove of the waveguide cavity, and the outer side surface of the thin-wall cavity and the oblique seam characteristics are convenient to machine; the correction heat treatment conformal clamp consists of a correction heat treatment conformal clamp bottom plate and a correction heat treatment conformal clamp pressing plate, the conformal clamp bottom plate is provided with three transverse three longitudinal limiting bosses and an oblique seam profiling limiting boss, the theoretical design gap is 0.02mm, and the single-side slotted thin-wall waveguide cavity is positioned and pressed for size stabilization heat treatment.
Furthermore, each clamp is made of precipitation hardening stainless steel, and the strength and the size stability of the clamp are improved by solution aging heat treatment and cooling treatment at minus 45 ℃.
Furthermore, the positioning tenons and the mortises are arranged at the two ends of the bottom plate and the pressing plate of each milling clamp, so that the positioning and alignment are convenient to perform during processing.
Furthermore, the heat treatment shape-preserving clamp is provided with an eccentric clamping mechanism to realize rapid clamping and pressing.
Compared with the prior art, the fixture combination for controlling the machining deformation of the unilateral slotted thin-wall waveguide cavity has the following advantages:
according to the structural characteristics of the parts, corresponding profile modeling limit clamps are provided for deep groove milling, inclined seam milling and final heat treatment processes, the rigidity of the asymmetric thin-wall cavity type parts is improved, the machining deformation is inhibited, and the machining efficiency and the product percent of pass are improved.
Drawings
1. FIG. 1 is a schematic diagram of a rough machining structure of a waveguide cavity according to the present invention;
2. FIG. 2 is a schematic diagram of deep groove clamping semi-finish machining of the back of a waveguide cavity according to the present invention;
3. FIG. 3 is a schematic diagram of a semi-finished structure of a waveguide cavity according to the present invention;
4. FIG. 4 is a schematic diagram of the front oblique seam clamping finish machining of the waveguide cavity of the present invention;
5. FIG. 5 is a schematic diagram of a waveguide cavity finish machining configuration of the present invention;
6. FIG. 6 is a schematic view of a waveguide cavity size correction clamping heat treatment of the present invention;
7. FIG. 7 is a schematic view of a waveguide cavity cover plate according to the present invention after being welded;
8. FIG. 8 is a pictorial view of a single-sided slotted thin-walled waveguide cavity embodying features of the present invention.
Description of reference numerals: 1. roughly machining a structural part of the waveguide cavity; 2. milling a deep groove clamp bottom plate; 3. milling a deep groove clamp pressing plate; 4. semi-finishing the structural member of the waveguide cavity; 5. milling a bottom plate of the oblique seam clamp; 6. milling a pressing plate of the oblique seam clamp; 7. finely machining the structural part of the waveguide cavity; 8. correcting the heat treatment conformal fixture bottom plate; 9. and (5) correcting the heat treatment conformal clamp pressing plate.
Detailed Description
The following detailed description of the invention refers to the accompanying drawings 1-8.
A clamp combination for controlling the machining deformation of a single-side slotted thin-wall waveguide cavity comprises a back deep groove milling clamp, a front oblique slot milling clamp and a correction heat treatment shape-preserving clamp. The back deep groove milling clamp consists of a milling deep groove clamp bottom plate 2 and a milling deep groove clamp pressing plate, the milling deep groove clamp bottom plate is provided with three transverse three longitudinal limiting bosses, the characteristic width of each boss is equivalent to the characteristic width of the groove on the front side of the waveguide cavity rough machining structural component 1, the theoretical design gap is 0.02mm, and the boss is matched and attached to a waveguide cavity rough machining blank so as to facilitate back thin-wall deep groove milling; the oblique seam milling clamp consists of an oblique seam milling clamp bottom plate 5 and an oblique seam milling clamp pressing plate 6, the oblique seam milling clamp bottom plate is provided with an oblique seam limiting boss, the characteristic width of the boss is equivalent to that of a deep groove on the back surface of a waveguide cavity finish machining structural member 7, the theoretical design gap is 0.02mm, the boss is matched and attached to the deep groove of the waveguide cavity tightly, and the outer side surface of the thin-wall cavity and the oblique seam characteristics are convenient to machine; the correction heat treatment conformal clamp consists of a correction heat treatment conformal clamp bottom plate 8 and a correction heat treatment conformal clamp pressing plate 9, the conformal clamp bottom plate is provided with three transverse three longitudinal limiting bosses and an oblique seam profiling limiting boss, the theoretical design gap is 0.02mm, and the single-side slotted thin-wall waveguide cavity is positioned and compressed for size stabilization heat treatment. The clamps are made of precipitation hardening stainless steel, and the strength and the dimensional stability of the clamps are improved by solid solution aging heat treatment and cold treatment at minus 45 ℃. Positioning tenons and mortises are arranged at the two ends of the bottom plate and the pressing plate of each milling clamp, so that the positioning and alignment are facilitated during processing; the heat treatment shape-preserving clamp is provided with an eccentric clamping mechanism to realize rapid clamping and pressing.
Referring to fig. 1, the processing object applied in the invention is a single-side slotted thin-wall waveguide cavity, a 3a21 aluminum alloy plate is adopted to perform rough processing according to a design drawing to obtain a rough processing structural member 1 of the waveguide cavity, a finish processing allowance and a peripheral clamping process allowance are reserved, and stress relief annealing is performed according to a process parameter of air cooling at 260 ℃ for 2 hours.
Referring to fig. 2, the rough-machined structural member 1 of the waveguide cavity is clamped with a bottom plate 2 and a pressing plate 3 of a milling deep groove clamp. The tenon and mortise structure is positioned, the characteristic width of the boss of the clamp bottom plate 2 is equivalent to the characteristic width of the front grooving of the waveguide cavity, the theoretical design gap is 0.02mm, the fit and the tight adhesion are ensured, and the back thin-wall deep groove milling is convenient. And firmly pressing the pressing plate on the working table of the high-speed milling center, and processing and forming the deep groove on the back surface of the waveguide cavity structure according to the process parameters of 10000r/min of rotation speed and 0.02mm of chip depth to obtain the waveguide cavity semi-finished structural member 4 shown in the figure 3.
Referring to fig. 4, the waveguide cavity semi-finishing structural member 4 is clamped with a milling oblique seam clamp bottom plate 5 and a pressing plate 6. The tenon and tenon hole structure is positioned, the characteristic width of the boss of the milling oblique seam clamp bottom plate 5 is equivalent to that of the deep groove on the back surface of the waveguide cavity, the theoretical design gap is 0.02mm, and the matching and the tight adhesion are ensured. And firmly pressing the pressing plate on the working table of the high-speed milling center, and performing finish machining on the allowance on the front surface of the waveguide thin-wall cavity and the slot according to the process parameters of 10000r/min of rotation speed, 20m/min of feed amount and 0.02mm of chip depth to obtain the waveguide cavity finish machining structural member 7 shown in the figure 7.
Referring to fig. 6, a waveguide cavity finish machining structural member 7 is assembled with a correction heat treatment clamp bottom plate 8 and a pressing plate 9, the clamp bottom plate 8 is provided with a deep groove and an oblique seam profiling limiting boss, a theoretical design gap is 0.02mm, a single-side slotted thin-wall waveguide cavity is positioned and pressed, and an eccentric wheel clamping mechanism clamps the waveguide cavity. The whole is placed in an oven, the temperature is kept at 100 ℃ for 4 hours, and the whole is cooled along with the oven, so that the residual stress is fully released, and the deformation is inhibited.
Referring to fig. 7, the unilateral slotted waveguide cavity 7 and the cover plate are welded by a vacuum brazing technology, and the formed slow-moving wire is subjected to linear cutting to remove a process reinforcing rib enclosure frame, so that a final sample piece is obtained, and the precision is ensured.
Furthermore, the fixture combination for controlling the processing deformation of the unilateral slotted thin-wall waveguide cavity is characterized in that each fixture is made of precipitation hardening stainless steel, and the strength and the dimensional stability of the fixture are improved by solid solution aging heat treatment and cold treatment at-45 ℃.
Referring to fig. 8, the fixture combination for controlling the machining deformation of the unilateral slotted thin-wall waveguide cavity is successfully applied to the manufacturing of physical samples and realizes batch production, and the precision meets +/-0.02 mm.
The clamp combination for controlling the machining deformation of the single-side slotted thin-wall waveguide cavity provides a corresponding profiling limiting clamp for the processes of deep groove milling, oblique slot milling and final heat treatment according to the structural characteristics of parts, improves the rigidity of asymmetric thin-wall cavity parts, inhibits machining deformation, and improves the machining efficiency and the product percent of pass.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (4)
1. A clamp combination for controlling machining deformation of a single-side slotted thin-wall waveguide cavity comprises a back deep groove milling clamp, a front oblique slot milling clamp and a correction heat treatment shape-preserving clamp, wherein the back deep groove milling clamp consists of a milling deep groove clamp bottom plate and a milling deep groove clamp pressing plate, and the milling deep groove clamp bottom plate is provided with three-transverse three-longitudinal limiting bosses which are matched and tightly attached to a waveguide cavity rough machining blank; the inclined seam milling clamp consists of an inclined seam milling clamp bottom plate and an inclined seam milling clamp pressing plate, and the inclined seam milling clamp bottom plate is provided with an inclined seam limiting boss which is matched and tightly attached to the deep groove of the waveguide cavity; the correction heat treatment conformal clamp consists of a correction heat treatment conformal clamp bottom plate and a correction heat treatment conformal clamp pressing plate, wherein the conformal clamp bottom plate is provided with three transverse three longitudinal limiting bosses and an oblique seam profiling limiting boss, and the single-side slotted thin-wall waveguide cavity is positioned and compressed to perform size stabilization heat treatment.
2. The combination of claim 1, wherein the fixture for controlling the deformation of the unilateral slotted thin-walled waveguide cavity during processing is characterized in that: the clamps are made of precipitation hardening stainless steel, and the solution aging heat treatment and the cooling treatment at minus 45 ℃ are carried out.
3. The combination of claim 1, wherein the fixture for controlling the deformation of the unilateral slotted thin-walled waveguide cavity during processing is characterized in that: and positioning tenons and mortises are arranged at the two ends of the bottom plate and the pressing plate of each milling clamp.
4. The combination of claim 1, wherein the fixture for controlling the deformation of the unilateral slotted thin-walled waveguide cavity during processing is characterized in that: the heat treatment conformal clamp is provided with an eccentric clamping mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111583374.7A CN114346717B (en) | 2021-12-22 | 2021-12-22 | Clamp combination for controlling machining deformation of unilateral slotting thin-wall waveguide cavity |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111583374.7A CN114346717B (en) | 2021-12-22 | 2021-12-22 | Clamp combination for controlling machining deformation of unilateral slotting thin-wall waveguide cavity |
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| CN114346717A true CN114346717A (en) | 2022-04-15 |
| CN114346717B CN114346717B (en) | 2024-02-27 |
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| CN202111583374.7A Active CN114346717B (en) | 2021-12-22 | 2021-12-22 | Clamp combination for controlling machining deformation of unilateral slotting thin-wall waveguide cavity |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115323291A (en) * | 2022-06-29 | 2022-11-11 | 西安航天精密机电研究所 | Low-temperature storage heat treatment method for aluminum alloy castings |
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| CN115805417A (en) * | 2022-12-28 | 2023-03-17 | 成都航新航空装备科技有限公司 | Machining method for thin-wall parts of aluminum alloy middle frame |
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2021
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114346717B (en) | 2024-02-27 |
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