CN104108007A

CN104108007A - Method for machining ridge waveguide horn antenna

Info

Publication number: CN104108007A
Application number: CN201410292761.9A
Authority: CN
Inventors: 徐琳
Original assignee: CETC 20 Research Institute
Current assignee: CETC 20 Research Institute
Priority date: 2014-06-25
Filing date: 2014-06-25
Publication date: 2014-10-22
Anticipated expiration: 2034-06-25
Also published as: CN104108007B

Abstract

The invention provides a method for machining a ridge waveguide horn antenna. The method comprises the steps of performing structure splitting according to a part model to form a plurality of split parts; designing structures of the split parts; machining the split parts by means of a machining mode combining numerical control milling and linear cutting; performing butt welding on the split parts through a vacuum soldering method; machining appearance and holes of a waveguide horn after butt welding is completed. By means of the technique of sequential structure splitting and butt welding, machining of the waveguide horn having the structural advantages of having a semi-closed deep cavity and ridge waveguides in the cavity, being small in size, and the like is achieved, dimension accuracy in the cavity and surface roughness can be improved effectively, machining difficulty is reduced greatly, and machining efficiency of the horn antenna is increased. The inner cavity is machined by means of the machining mode combining numerical control milling and linear cutting, 0.03mm-0.05mm dimension precision and Ra1.6 surface roughness are ensured, and surface quality of the inner cavity is improved. Special tools are utilized to assemble the split parts during butt welding, then, vacuum soldering is performed, and therefore, welding precision is improved.

Description

A kind of processing method of ridge waveguide electromagnetic horn

Technical field

The present invention relates to antenna processing technique field, be specially a kind of processing method of ridge waveguide electromagnetic horn.

Background technology

Ultra-wideband antenna is with its superior broadband character, in advanced military fields such as satellite communication, satellite navigation, command and control system, electronic countermeasure, radar detections, be widely used, along with the more and more attention of people to ultra-wideband antenna design, the ultra-wideband antenna of new construction, new capability continues to bring out, for example ridged horn (antenna).Ridged horn (antenna) is in order to meet more broadband requirement on the basis of common electromagnetic horn, according to wideband waveguide Theoretical Design out, more complicated than common electromagnetic horn in structure, conventionally there is complicated inner-cavity structure and profile, its required precision is also very high, and these have brought difficulty all to the processing of ridged horn (antenna).

In certain type research of radar process, radar antenna unit has adopted the version of ridge waveguide electromagnetic horn, material is aluminium alloy, this electromagnetic horn has the design features such as ridged step in semiclosed dark chamber, chamber, size be less, adopt existing electromagnetic horn processing method cannot complete processing at all, even if can process architectural feature, its required precision also can not meet the dimensional accuracy of 0.03～0.05mm and the surface roughness requirement of Ra1.6, therefore must propose brand-new processing scheme.

There is following drawback in the processing method of existing electromagnetic horn:

Because waveguide trumpet has type semienclosed architectural feature mostly, in chamber, semi-closed structure has limited machining feed path, the cutter space of not advancing and retreat in the processing of right angle in chamber, thereby form processing dead angle, spark machined can only be passed through in these processing dead angles, and well-known spark machined efficiency is lower, and the electric discharging machining electrode of small scale structures is very little, work in-process electrode very easily produces bending, distortion, causes the dimensional accuracy processing defective.

Summary of the invention

The object of the invention is to overcome the deficiency of existing processing method, provide a kind of and can complete the processing technology with the waveguide trumpet of the design feature such as ridged step, small size in semiclosed dark chamber, chamber, it can improve dimensional accuracy and the surface roughness of inner chamber, can significantly reduce difficulty of processing, effectively improve the working (machining) efficiency of waveguide trumpet.

Technical scheme of the present invention is:

The processing method of described a kind of ridge waveguide electromagnetic horn, is characterized in that: adopt following steps:

Step 1: in CAD software, the threedimensional model of ridge waveguide electromagnetic horn is carried out to structure fractionation, form some fractionation parts;

Step 2: in CAD software, each is split to part and carry out structural design according to processing request respectively;

Step 3: prepare blank material according to the design result of step 2, and adopt the processing mode processing of numerical control mill joint line cutting to obtain splitting part;

Step 4: adopt the method for vacuum brazing, carry out welding to splitting part;

Step 5: processing ridge waveguide electromagnetic horn profile and each hole after welding completes.

Further preferred version: the processing method of described a kind of ridge waveguide electromagnetic horn, is characterized in that: forming some fractionation part processes in step 1 is:

Step 1.1:, as processing dead angle, take and process dead angle as separation in the position, summit, right angle of take in the waveguide trumpet chamber of ridge waveguide electromagnetic horn, semi-enclosed waveguide trumpet chamber is split, and obtains fractionation face, forms the easily open cavity of processing;

Step 1.2: carry out structure fractionation according to the threedimensional model splitting in the face of ridge waveguide electromagnetic horn in CAD software, need to form the least possible some fractionation parts according to processing.

Further preferred version: the processing method of described a kind of ridge waveguide electromagnetic horn, is characterized in that: split structural design of fittings in step 2 and comprise the steps:

Step 2.1: each is split to weld parts place and be designed to bridging arrangement;

Step 2.2: the lateral surface that splits part is all designed to flat surface, and reserves at least allowance of 2mm;

Step 2.3: according to welding location needs, splitting Design Orientation step on part;

Step 2.4: determine and split accessory appearance size according to solder thickness.

Further preferred version: the processing method of described a kind of ridge waveguide electromagnetic horn, is characterized in that: the process that splits part in step 3 comprises the steps:

Step 3.1: adopt plain-milling machine processing to remove the large surplus that splits part blank material;

Step 3.2: adopt the processing that numerical control mill mode is thick, finish-milling splits each flat surface of part, vertical plane, guarantee the dimensional accuracy of each face of inner chamber 0.03～0.05mm;

Step 3.3: adopt numerical control mill mode to draw milling processing and split External Shape;

Step 3.4: adopt the processing of line cutting mode slow wire feeding to split component with inclined plane, obtain splitting part.

Beneficial effect

The invention has the beneficial effects as follows:

(1) by structure split, the process of welding again, realized the processing of the waveguide trumpet of ridged step, small scale structures feature in semiclosed dark chamber, chamber;

(2) adopt the processing mode of numerical control mill joint line cutting can meet 0.03～0.05mm dimension precision requirement and the requirement of R1.6 surface roughness of its harshness, and be suitable for batch production, difficulty of processing is little, and product percent of pass is high.

(3) adopt during welding frock to realize the accurate location before welding, vacuum brazing has once been welded, and has improved welding quality and dimensional accuracy.

Accompanying drawing explanation

Fig. 1 ridge waveguide electromagnetic horn part model;

Fig. 2 splits design of part schematic diagram;

Plate in Fig. 3 (b) structural representation;

Fig. 4 frock (f) structural representation.

In figure, (a) left plate, (b) middle plate, (c) right panel, (d) upper plate, (e) lower plate, (f) frock.

The specific embodiment

Below in conjunction with specific embodiment, the present invention is described:

The electromagnetic horn of ridge waveguide shown in Fig. 1 of take is example, and its processing method adopts following steps:

Step 1: in CAD software, the threedimensional model of ridge waveguide electromagnetic horn is carried out to structure fractionation, form some fractionation parts:

Step 1.1: ignore step, summit, right angle A, B, C, the D position of take in the waveguide trumpet chamber of ridge waveguide electromagnetic horn are processing dead angle, take processing dead angle be separation, first cavity is split into 5 parts, in like manner split other 3 cavitys, the fractionation face of obtaining, forms the easily open cavity of processing.

Step 1.2: carry out structure fractionation according to the threedimensional model splitting in the face of ridge waveguide electromagnetic horn in CAD software, need to form the least possible fractionation part according to processing: connect coplanar portions, form 8 and split body; Consider step, step is increased to respectively on left side plate, rear plate is increased to lower plate, forms L-type structure; Final 7 of forming as shown in Figure 2 split part: left plate (a), 3 blocks of middle plates (b), right panel (c), upper plate (d) and lower plate (e).

The middle plate (b) (seeing Fig. 3) of take is example, and process is as follows:

Step 3.1: plate blank material in preparation, middle plate appearance and size is 10mm * 50mm * 20mm, middle plate blank material appearance and size is 10mm * 90mm * 60mm; Adopt plain-milling machine processing to remove the large surplus that splits part blank material;

Step 3.3: adopt plate profile in numerical control mill mode edge to draw milling processing, working depth 9.8mm, machines rear part not separated yet with blank, raps thickness 0.2mm junction, separate component and defective material with little chisel;

Step 3.4: adopt the processing of line cutting mode slow wire feeding to split component with inclined plane, finally obtain middle plate.

Step 4: adopt the method for vacuum brazing, carry out welding to splitting part:

Step 4.1: the contact-making surface shape during according to fractionation Assembly of the parts, design solder physical dimension, thickness is 0.1mm;

Step 4.2: line cutting processing solder;

Step 4.3: use frock shown in Fig. 4 that each is split to part accurate assembly location, split during assembling between part and place solder, compress screw fastening with dull and stereotyped;

Step 4.4: implement vacuum brazing.

Step 5: processing ridge waveguide electromagnetic horn profile and each hole after welding completes:

Step 5.1: the ridged step surface that machines before weldering in waveguide trumpet chamber of take carries out centering as machining benchmark;

Step 5.2: horizontal plane and vertical plane in fine finishining waveguide trumpet profile, the inclined-plane in line cutting processing profile;

Step 5.3: process each hole on jig boring machine.

Claims

1. a processing method for ridge waveguide electromagnetic horn, is characterized in that: adopt following steps:

2. a kind of processing method of ridge waveguide electromagnetic horn according to claim 1, is characterized in that: in step 1, forming some fractionation part processes is:

3. a kind of processing method of ridge waveguide electromagnetic horn according to claim 1, is characterized in that: in step 2, split structural design of fittings and comprise the steps:

4. a kind of processing method of ridge waveguide electromagnetic horn according to claim 1, is characterized in that: the process that splits part in step 3 comprises the steps: