A CNC machining process for communication device housings

Abstract

The application discloses a kind of communication device shell numerical control processing technology, including the following steps: 1) with the way of side positioning blank is clamped to numerical control center fixture, A face is processed once;2) with the positioning hole that B face is processed once is positioned, A face is processed once;3) with the positioning hole that B face is processed once is positioned, A face is processed twice, and positioning precision hole is processed;4) with the positioning precision hole that A face is processed twice is positioned, B face is processed twice;5) with the positioning precision hole that A face is processed twice is positioned, while cooperating numerical control processing center control fixture with blank rotation, C face, D face, E face, F face are processed in turn.The processing technology of the application processes pressing plate position and positioning hole first, then positions with fixed pin and adopts the way of pressing down, can better guarantee the stability of key dimension, can effectively guarantee the processing quality of filter shell.

Description

Technical Field

[0001] This invention belongs to the technical field of CNC machining, specifically relating to a process for machining filter housings using CNC machining equipment. Background Technology

[0002] Cavity filters are key components of modern mobile communication systems, widely used in wireless communication base stations and various communication terminals. A cavity filter consists of an RF connector, a cavity, a cover plate, multiple resonator units, and frequency tuning and coupling strength adjustment components. The resonant frequencies of the multiple resonator units are distributed within the passband, blocking signals outside the resonant frequency and thus selectively selecting microwave transmission signals. The machining precision requirements for the resonator stages and cavity depth within the cavity are high.

[0003] Currently, the machining of cavity filters typically employs a floating pin positioning method, where the filter is pushed upwards during machining. However, due to unstable die-cast blank dimensions and clamping issues, problems such as misalignment of the inner cavity hole coordinates, instability of the resonant stage and cavity depth dimensions, and out-of-tolerance coupling dimensions can occur. Summary of the Invention

[0004] To address the problems of misalignment of internal cavity hole coordinates, instability of resonant stage and cavity depth dimensions, and out-of-tolerance coupling dimensions caused by the previous floating pin positioning and upward machining method, this invention provides a CNC machining process for communication device housings. The process first machines the pressure plate position and positioning hole, and then uses fixed pin positioning and downward pressing to better ensure the stability of key dimensions and effectively guarantee the machining quality of the filter housing.

[0005] To achieve the above objectives, the following technical solution is provided:

[0006] A CNC machining process for a communication device housing includes the following steps:

[0007] 1) The blank is clamped onto the CNC center fixture using edge positioning, and surface B is machined in one operation;

[0008] 2) Position the A surface using the positioning holes machined during the first machining of the B surface, and then perform the first machining of the A surface.

[0009] 3) Use the positioning holes machined during the first machining of surface B for positioning, perform a second machining of surface A, and machine positioning precision holes;

[0010] 4) Use the positioning precision hole machined during the secondary machining of surface A for positioning, and then perform secondary machining on surface B;

[0011] 5) Position the workpiece using the positioning holes machined during the second machining of surface A, and simultaneously coordinate with the CNC machining center to control the fixture to rotate the workpiece, and machine surfaces C, D, E and F in sequence;

[0012] 6) Post-process the processed shell material.

[0013] As a further limitation of the technical solution of the present invention, the specific operation process of step 1) is as follows: first, the edge positioning method is used for positioning, the blank is clamped with a vise, and after clamping, the B surface is milled in a CNC machining center until the surface is smooth and the thickness is more than 52mm.

[0014] Then, precision mill the three positioning holes and the anti-fool hole, and machine the T-plate grooves around the perimeter.

[0015] As a further limitation of the technical solution of the present invention, the specific operation process of step 2) is as follows: first, the three positioning holes precision milled during the first processing of surface B are used for positioning, and the blank is pressed onto the fixture by the surrounding T-plate grooves.

[0016] Then, surface A is milled until the entire surface is smooth, ensuring a thickness of 50.5±0.1mm;

[0017] Next, the cover plate mounting surface, inner cavity, resonant stage, and tap stage are milled in sequence. The inner cavity is milled to a depth of 25mm and the step surface depth is 11mm. The surface roughness of the resonant stage and tap stage is Ra0.8, and chamfering is performed.

[0018] Finally, process the ribs at each location and chamfer them, with the cover plate surface chamfered to C0.1-C0.2.

[0019] As a further limitation of the technical solution of the present invention, the specific operation process of step 3) is as follows: first, the three positioning holes milled during the first processing of surface B are used for positioning, and the blank is pressed onto the fixture by the surrounding T-plate grooves, and the misalignment with surface A during the first processing is within 0.1mm.

[0020] Then, tap each threaded hole, and chamfer or countersunk the threaded holes, and make the countersunk holes on two of the threaded holes into positioning precision holes.

[0021] As a further limitation of the technical solution of the present invention, the specific operation process of step 4) is as follows: first, the two Φ4.3 positioning holes milled during the secondary processing of surface A are used for positioning, and the blank is pressed onto the fixture by the surrounding T-plate grooves;

[0022] Then, the plane is milled to ensure the total height is 49.5mm. After that, the heat dissipation teeth, bracket bosses are machined, the rounded corners are chamfered, and the four corners are milled into rounded arcs.

[0023] Finally, drill four M5 threaded holes, each 12mm deep, and chamfer them.

[0024] As a further limitation of the technical solution of the present invention, the specific processing steps of the heat dissipation teeth are as follows:

[0025] First, use a D10.0 roughing cutter to perform rough machining, milling away most of the excess aluminum material;

[0026] Next, use D7.0 and D5.8 milling cutters to machine the remaining material after roughing the heat dissipation tooth surface;

[0027] Next, use a D5.8 angled round nose end mill to finish the heat dissipation tooth surface, and the heat dissipation tooth is basically formed;

[0028] Finally, the curved surfaces on both sides of the heat dissipation teeth are machined using a D5.8 milling cutter, and the heat dissipation teeth are now machined.

[0029] As a further limitation of the technical solution of the present invention, the specific operation process of step 5) is as follows: first, positioning is performed using the two Φ4.3 positioning holes milled during the secondary processing of surface A, and surface E and surface F are clamped by a fixture;

[0030] Then, the steps and the outer circle boss of the connector are machined by milling, and then the M18 thread is machined. The thread opening is chamfered at C0.5 and a relief groove is reserved. Two through holes are drilled and reamed. The inner cavity through hole is chamfered and deburred with a dovetail cutter to complete the C-surface machining.

[0031] Next, the CNC machining center is paused, and the fixture is rotated 180 degrees with the blank. The steps and the outer diameter boss of the connector are milled, and then the M18 thread is machined. The thread opening is chamfered at C0.5 and a relief groove is reserved. Four through holes are drilled and reamed, and the inner cavity through hole is chamfered and deburred with a dovetail cutter to complete the machining of surface D.

[0032] Next, pause the CNC machining center, control the fixture to rotate 90 degrees with the blank, mill the steps and threaded columns, tap 4 M5 threaded holes with a depth of 10.5mm, machine the vent hole, and make a countersunk plate with a diameter of 12.2mm and a depth of 3.9mm; tap M12*1.5-6G through holes, chamfer ￠14.3*60 degrees, and complete the E surface machining;

[0033] Finally, the CNC machining center is paused, the fixture is rotated 180 degrees with the blank, the steps and threaded columns are milled, and chamfering is performed. Four M5 threaded holes with a depth of 10.5mm are drilled at the spot to complete the machining of the F surface.

[0034] As a further definition of the technical solution of the present invention, the specific operation process of step 6) is as follows: the processed blank is taken out from the CNC machining center, and the filter housing is subjected to deburring, wet grinding, shot blasting, powder spraying and electroplating in sequence.

[0035] As a further definition of the technical solution of the present invention, the deburring process is as follows: First, all edges and corners of the area to be powder-coated are ground smooth, the joints of the steps processed in different processes are ground smoothly, and the corners are ground with a radius of R0.5 or more; then, the inner cavity cover plate surface, resonant table, ribs, step surfaces, etc. are not deburred, and the sharp edges of the CNC machining cannot be chamfered are removed with tools; finally, the surface is polished and trimmed with a quick-cleaning cloth to complete the entire deburring process.

[0036] As a further limitation of the technical solution of the present invention, the shot blasting process is as follows: the filter housing is subjected to mixed shot blasting treatment, and the shot blasting treatment uses stainless steel and mixed steel shot with diameters of 0.1mm and 0.3mm.

[0037] Compared with the prior art, the present invention has the following advantages:

[0038] 1) The processing technology of the present invention first processes the pressure plate position and positioning hole, and then uses fixed pins for positioning and downward pressing, which can better ensure the stability of key dimensions and effectively ensure the processing quality of the filter housing. It can better solve the problems of internal cavity hole position coordinate deviation, unstable resonant stage and cavity depth dimensions, and out-of-tolerance coupling dimensions caused by the floating pin positioning previously used.

[0039] 2) Use fixing pins and downward pressing to reduce defects caused by dimensional deviations;

[0040] 3) Optimize processing procedures based on product structure to save manpower, fixtures, and tooling, thereby reducing costs. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a schematic diagram showing the numbering of each side of the filter housing of the present invention;

[0043] Figure 2 This is a schematic diagram illustrating edge positioning during a single processing step of surface B according to the present invention;

[0044] Figure 3 This is a schematic diagram illustrating edge positioning during a single processing step of surface B according to the present invention;

[0045] Figure 4 This is a schematic diagram of the positioning holes processed during the first processing of surface B in this invention;

[0046] Figure 5 This is a schematic diagram of the T-plate groove processed during the first processing of surface B in this invention;

[0047] Figure 6 This is a schematic diagram of the structure when surface A is processed once according to the present invention;

[0048] Figure 7 This is a schematic diagram of the structure when the A-side is processed in the secondary process according to the present invention;

[0049] Figure 8 This is a schematic diagram of the structure when the B-side is processed in the secondary process according to the present invention;

[0050] Figure 9 This is a schematic diagram of the structure during the processing of surface C in this invention;

[0051] Figure 10 This is a schematic diagram of the structure during the processing of surface C in this invention;

[0052] Figure 11 This is a schematic diagram of the structure during the processing of surface D in this invention;

[0053] Figure 12 This is a schematic diagram of the structure during the processing of surface D in this invention;

[0054] Figure 13 This is a schematic diagram of the structure during the processing of surface E in this invention;

[0055] Figure 14 This is a schematic diagram of the structure during the processing of surface F according to the present invention. Detailed Implementation

[0056] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application.

[0058] It should be noted that the singular forms of "a," "an," and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that terms such as "comprising / including" or "having" specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0059] like Figure 1 As shown, the CNC machining process for the communication device housing of the present invention includes the following machining steps.

[0060] First, the B side is processed once.

[0061] Specifically, positioning is first performed using edge positioning, such as... Figure 2 , 3 As shown, the blank is clamped in a vise, and then the B side is milled in a CNC machining center until the surface is smooth and the thickness is greater than 52mm.

[0062] Mill three 6mm deep positioning holes 11 and anti-fool holes, each Φ5 (+0.05 / +0.02)mm in diameter, and machine the surrounding T-shaped pressure plate grooves 12. Figure 4 , 5 As shown.

[0063] Then, surface A is processed once.

[0064] Specifically, the blank is first positioned using the three Φ5 positioning holes 11 precision milled during the first machining of surface B, and then pressed onto the fixture by the surrounding T-plate grooves 12.

[0065] Then, surface A is milled until the entire surface is smooth, ensuring a thickness of 50.5±0.1mm;

[0066] Next, the cover plate mounting surface, inner cavity, resonant stage 13, and tap stage 14 are milled sequentially. The inner cavity is milled to a depth of 25mm, and the step surface depth is 11mm. The surface roughness of the resonant stage 13 and tap stage 14 is Ra0.8, and chamfering is performed. Figure 6 As shown;

[0067] Finally, process the reinforcing bars 15 at each location, such as... Figure 6 As shown, bevel the edges, with the cover plate surface beveled to C0.1-C0.2.

[0068] Next, surface A undergoes secondary processing.

[0069] Specifically, the workpiece is first positioned using the three Φ5 positioning holes 11 precision milled during the first machining of surface B, and the workpiece is pressed onto the fixture by the surrounding T-plate grooves 12, ensuring that the machining misalignment between surface A and surface B is within 0.1mm during the first machining of surface A.

[0070] Then, tap 18 M3 threaded holes, each 8mm deep, and chamfer them with a Φ3.2(+0.2)mm*90-degree bevel. Figure 4 In the diagram, holes A1 to A18; 134 are M3 threaded holes, 10mm deep, with countersunk holes of Φ3.3mm and 3mm deep (B1 to B134); 24 are M3 threaded holes, 11.5mm deep, with countersunk holes of Φ3.3mm and 2mm deep (C1 to C24); 20 are M3 threaded holes, 7mm deep, with chamfered Φ3.5mm*90 degrees (D1 to D20); 16 are M2.5 threaded holes, 8mm deep, with countersunk holes of Φ2.7mm and 2mm deep (E1 to E16); 4 are M4 threaded holes, 12mm deep, with countersunk holes of Φ4.3mm and 4mm deep (F1 to F4). Figure 7 As shown;

[0071] Among them, the countersunk holes F1 and F4 are made into positioning precision holes of Φ4.3(+0.05 / +0.02)mm.

[0072] It should be noted here that since the first surface is entirely threaded, it cannot be used as a positioning hole. Considering that F1 and F4 are two φ4.3 countersunk holes located diagonally, which facilitates the clamping of the positioning pin and the positioning of the product, the countersunk holes F1 and F4 are selected as the positioning precision holes 16 for subsequent processes.

[0073] Then, the B side undergoes secondary processing.

[0074] Specifically, the blank is first positioned using the two Φ4.3 positioning precision holes 16 (i.e., F1 and F4) milled during the secondary machining of surface A, and then the blank is pressed onto the fixture by the T-plate grooves around the perimeter.

[0075] Then, the plane is milled to ensure the total height is 49.5mm. After that, heat dissipation teeth 17, bracket boss, chamfered corners, and milled the four corners of the outer arc.

[0076] Finally, drill four M5 threaded holes, each 12mm deep, and chamfer them with a Φ5.9(0 / -0.2)mm x 90 degrees. Figure 8 As shown.

[0077] The processing method for the heat dissipation teeth is as follows:

[0078] First, use a 10.0mm diameter rough milling cutter to rough machine and remove most of the excess aluminum material;

[0079] Next, the remaining material after roughing the heat dissipation tooth surface was machined using end mills with diameters of 7.0 mm and 5.8 mm.

[0080] Next, the heat dissipation tooth surface is precision machined using a 5.8mm diameter beveled round nose end mill, and the heat dissipation tooth is basically formed;

[0081] Finally, the curved surfaces on both sides of the heat dissipation teeth were machined using a 5.8mm diameter milling cutter, and the heat dissipation teeth were completed.

[0082] Next, surfaces C, D, E, and F are machined.

[0083] Specifically, the two Φ4.3mm positioning precision holes 16 (i.e., F1 and F4) that were precision milled during the secondary machining of surface A are used for positioning, and surfaces E and F are clamped by a fixture;

[0084] Then, machine surface C. Specifically, first, mill step 19 and the connector outer circular boss, then machine M18 thread 20, and chamfer C0.5 at the thread opening, leaving a relief groove; drill and ream two through holes of Φ4.4±0.05mm and Φ7±0.05mm, 24mm deep (the hole on the surface of the step is Φ7±0.05mm in diameter and 24mm deep, and the lower part of the step is a through hole of Φ4.4±0.05mm in diameter). Deburr the inner cavity through hole using a dovetail cutter. Figure 9 , Figure 10 As shown;

[0085] Next, the horizontal CNC machining center is rotated 180 degrees to machine surface D.

[0086] Specifically, first, the step 21 and the outer circular boss of the connector are milled, then the M18 thread 22 is machined, and a chamfer C0.5 is made at the thread opening, with a relief groove reserved; four through holes of Φ4.4±0.05mm and Φ7±0.05mm in diameter and 24mm in depth are drilled and reamed (the holes on the surface of the step are Φ7±0.05mm in diameter and 24mm in depth, and the lower part of the step is a through hole of Φ4.4±0.05mm in diameter). The inner cavity through hole is deburred by chamfering with a dovetail cutter, such as... Figure 11 , Figure 12 As shown;

[0087] Next, after the horizontal CNC machining center is paused, the product is manually transferred to another clamping position of the fixture, then the pressure plate is tightened, and then surface E is machined.

[0088] Specifically, first mill the step 23 and threaded post 24, then tap four M5 threaded holes, each 10.5mm deep. Next, machine the vent hole 25: first machine a countersunk plate Φ12.2mm deep and 3.9mm deep, then tap an M12*1.5-6G through hole, and chamfer Φ14.3*60 degrees (the countersunk plate taps the M12*1.5 threaded hole to the through, then chamfers the surface of the threaded hole with a diameter of Φ14.3 and an angle of 60 degrees). Figure 13 As shown.

[0089] Finally, process surface F.

[0090] Specifically, first mill the steps and threaded posts, then chamfer them. Next, drill four M5 threaded holes, each 10.5mm deep, at the spot. Figure 14 As shown.

[0091] After completing the above processing steps, the processed blank is taken out from the CNC machining center, and the filter housing is post-processed.

[0092] Specifically, first, all edges and corners of the areas that will be powder coated are ground smooth, and the joints between different processing steps are ground smoothly, with corners rounded to a radius of R0.5 or more. Then, the inner cavity cover plate, resonant table, ribs, and step surfaces are not deburred, and sharp edges are removed from areas that cannot be chamfered by CNC machining. Finally, the surface is polished and finished with a quick-cleaning cloth to complete the entire deburring process.

[0093] Then, a robotic arm is used to perform wet grinding on the filter housing;

[0094] Next, the filter housing after wet grinding is cleaned with ultrasonic waves to remove oil and aluminum shavings;

[0095] Next, the filter housing is subjected to mixed shot blasting treatment using stainless steel and mixed steel shot with diameters of 0.1 mm and 0.3 mm.

[0096] Next, the filter housing undergoes an overall oxidation process; after the oxidation process, the filter housing is then powder-coated.

[0097] Finally, electroplating is performed on the inner cavity and interface areas.

[0098] The above embodiments are illustrative of the present invention and not intended to limit the invention. It is understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A communication device housing numerical control machining process, characterized in that, Comprise the following steps: 1) adopt the edge positioning mode to clamp the blank to the numerical control center fixture, and process B face once; The operation process of step 1) is as follows: first, adopt the edge positioning mode to position, adopt the vice to clamp the blank, clamp the blank, and mill B face in the CNC machining center, until the fly surface is light, and the thickness size is above 52mm; Then, fine milling 3 positioning holes (11) and foolproof holes, and processing the T pressing plate groove (12) around; 2) positioning with the positioning hole processed when B face is processed once, and processing A face once; The operation process of step 2) is as follows: first, position with the 3 positioning holes (11) fine-milled when B face is processed once, and press the blank on the fixture through the T pressing plate groove (12) around; Then, mill A face to the whole surface light, and ensure that the thickness size is 50.5±0.1mm; Then, mill the cover plate mounting surface, the inner cavity, the resonance table (13), and the tap table (14) in turn, wherein the inner cavity is milled to a cavity depth of 25mm, and the step surface depth is 11mm; The roughness of the resonance table (13) and the tap table (14) is Ra0.8, and chamfering is carried out; Finally, process the rib (15) everywhere, and chamfer the cover plate surface C0.1-C0.2; 3) positioning with the positioning hole processed when B face is processed once, and processing A face twice, and processing positioning precision hole; The operation process of step 3) is as follows: first, position with the 3 positioning holes (11) fine-milled when B face is processed once, and press the blank on the fixture through the T pressing plate groove (12) around, and ensure that the misalignment with A face processed once is within 0.1mm; Then, drill and tap each threaded hole, and chamfer or process the counterbore of the threaded hole, and make the counterbore of two threaded holes into positioning precision holes (16); 4) positioning with the positioning precision hole processed when A face is processed twice, and processing B face twice; The operation process of step 4) is as follows: first, position with the 2 Φ4.3 positioning precision holes (16) fine-milled when A face is processed twice, and press the blank on the fixture through the T pressing plate groove around; Then, mill the plane, ensure that the total height is 49.5mm, then process the heat dissipation teeth (17), the support boss, the R angle, and mill the four corner arcs; Finally, drill and tap 4 M5, 12mm deep threaded holes (18), and chamfer; 5) positioning with the positioning precision hole processed when A face is processed twice, and processing C face, D face, E face, and F face in turn while the fixture with the blank is rotating under the control of the numerical control machining center; The operation process of step 5) is as follows: first, position with the 2 Φ4.3 positioning precision holes (16) fine-milled when A face is processed twice, and press E face and F face on the fixture; Then, mill the step and the connector outer circular boss, then process M18 thread, and chamfer C0.5 at the thread port, and reserve the tool withdrawal groove; Drill 2 through holes, chamfer the inner cavity through hole with dovetail tool, and deburr, complete C face processing; ​ Next, the numerical control machining center is operated to pause, the clamp is controlled to rotate the blank by 180 degrees, the step, the connector outer circle boss is processed by milling, then the M18 thread is processed, the chamfer C0.5 is processed at the thread opening, and the tool withdrawal groove is reserved; four through holes are drilled and reamed, the inner cavity through hole is chamfered with a dovetail tool and deburred, and the D surface processing is completed; Next, the numerical control machining center is operated to pause, the clamp is controlled to rotate the blank by 90 degrees, the step and the threaded column are milled, four M5, 10.5mm deep threaded holes are drilled and tapped, the air hole is processed, the Φ12.2mm, 3.9mm deep sink is processed; the M12*1.5-6G hole is drilled and tapped, the chamfer is Φ14.3*60 degrees, and the E surface processing is completed; Finally, the numerical control machining center is operated to pause, the clamp is controlled to rotate the blank by 180 degrees, the step and the threaded column are milled, chamfered, four M5, 10.5mm deep threaded holes are drilled and tapped, and the F surface processing is completed; 6) The processed shell material is post-treated.

2. The communication device housing numerical control machining process according to claim 1, characterized in that: The machining process of the heat dissipation teeth (17) is specifically: First, use a D10.0 roughing milling cutter to rough mill most of the excess aluminum material; Next, use D7.0 and D5.8 milling cutters to process the remaining residual material after roughing the heat dissipation tooth surface; Then, use a D5.8 bevel nose milling cutter to finish machining the heat dissipation tooth surface, and the heat dissipation teeth are basically formed; Finally, use a D5.8 milling cutter to process the circular arc surface on both sides of the heat dissipation teeth, and the heat dissipation teeth are completed.

3. The communication device housing numerical control machining process according to claim 1, characterized in that: The operation process of step 6) is specifically: the processed blank is taken out from the numerical control machining center, and the filter shell is sequentially deburred, wet ground, shot blasted, powder sprayed, and electroplated.

4. The communication device housing numerical control machining process according to claim 3, characterized in that: The deburring process is: first, polish all the corners of the area that needs to be treated by powder spraying in the subsequent process, polish the tool joint step of different process machining to be smooth, and polish the corner position to be R0.5 or more; then, do not deburr the inner cavity cover plate surface, resonance platform, rib, step surface and other positions, and use tools to remove sharp edges that cannot be chamfered by numerical control machining; finally, polish and trim with a quick cleaning cloth to complete the entire deburring process.

5. The communication device housing numerical control machining process according to claim 3, characterized in that: The shot blasting process is: the filter shell is mixed shot blasted, the shot blasting treatment uses stainless steel mixed with 0.1mm and 0.3mm steel shots. ​

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