A CNC machining process for filter housing

Abstract

The application discloses a filter shell numerical control machining process, which comprises the following steps: 1) correcting the flange surface and the inner cavity bottom surface of the A surface on a correction platform, so as to ensure that the flatness is within a preset value; 2) performing primary processing on the B surface; 3) performing primary processing on the A surface; 4) performing secondary processing on the A surface; 5) performing secondary processing on the B surface; 6) performing tertiary processing on the B surface, operating a numerical control machining center to pause, rotating the clamp with the blank by 90 degrees, and processing the C1 surface; 7) processing the C2 surface, the C3 surface and the C4 surface in sequence; and 8) performing post-processing on the processed shell material. According to the machining process, the pressing plate position and the positioning hole are processed first, then the fixed pin is positioned and the downward pressing mode is adopted, so that the stability of the key size can be better ensured, and the machining quality of the filter shell is effectively ensured.

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. High precision is required in the machining of the resonator stages and cavity depth within the cavity.

[0003] Currently, the common method for machining cavity filters is to use floating pin positioning and upward machining. However, due to unstable die-cast blank dimensions and unstable clamping, problems such as misalignment of the inner cavity hole coordinates, unstable resonant stage and cavity depth dimensions, and out-of-tolerance coupling dimensions occur. Summary of the Invention

[0004] To address the problems of unstable die-cast blank dimensions and clamping in existing technologies, such as floating pin positioning and upward machining, which lead to misalignment of internal cavity hole coordinates, unstable dimensions of the resonant stage and cavity depth, and out-of-tolerance coupling dimensions, this invention provides a CNC machining process for filter housings. First, the pressure plate position and positioning holes are machined, and then fixed pins are used for positioning and downward clamping. This better ensures the stability of key dimensions and effectively guarantees the machining quality of the filter housing.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

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

[0007] 1) On the calibration platform, calibrate the flange face and the bottom surface of the inner cavity of surface A to ensure that the flatness is within the preset value;

[0008] 2) Using the bottom surface of the inner cavity of surface A as a reference, perform one machining operation on surface B;

[0009] 3) Using the bottom surface of the inner cavity of surface B as a reference, surface A is machined once;

[0010] 4) Using the processed surfaces of several pressure plate positions processed in the first processing step of surface B as a reference, surface A is processed a second time;

[0011] 5) Using the processed surfaces of several pressure plate positions processed in the first processing step of surface A as a reference, surface B is processed a second time;

[0012] 6) Using surface A as a reference, perform three machining operations on surface B. Pause the CNC machining center and control the fixture to rotate 90 degrees with the blank to machine surface C1.

[0013] 7) Machining surfaces C2, C3, and C4 sequentially;

[0014] 8) Post-process the processed shell material.

[0015] As a further limitation of the present invention, the correction operation in step 1) specifically includes:

[0016] First, use a rubber mallet to calibrate the flange face and pressure plate position on the calibration base plate to ensure that the flatness is ≤0.3mm;

[0017] Then, calibrate the bottom plane of the inner cavity to ensure that the dial indicator range is ≤0.2mm;

[0018] Finally, use a knife-edge ruler to check the two pressure plate positions in the middle of side B to ensure that the flatness is ≤0.1mm.

[0019] As a further limitation of the present invention, the specific process of step 2) for processing surface B is as follows:

[0020] First, using the bottom surface of the inner cavity of surface A as a reference, install several die-casting pre-holes on the billet onto the positioning pins on the fixture, and position them through the die-casting pre-holes. Then, load the long pressure plate through the mounting pins on the fixture and use the long pressure plate to press the billet.

[0021] Then, process several end faces of the pressure plate position to ensure that the height difference between the pressure plate position machine surface is H, and the dimensions of the pressure plate position machine surface to the bottom of the inner cavity of surface A are h1 and h2 respectively, and H = h1 + h2;

[0022] Finally, several through holes are machined as positioning holes for positioning in subsequent processes.

[0023] As a further limitation of the present invention, the specific process of step 3) of processing surface A is as follows:

[0024] First, using the bottom surface of the inner cavity of surface B as a reference, install the several through holes processed above onto the positioning pins on the fixture for positioning. Then, load the long pressure plate through the mounting pins on the fixture and use the long pressure plate to press the blank.

[0025] Then, process several end faces of the pressure plate positions to ensure that the height difference between the machine-made surfaces of the pressure plate positions is H, and the dimensions from the machine-made surfaces of the pressure plate positions to the bottom surface of the inner cavity are h3 and h4, respectively, and H = h3 + h4.

[0026] As a further limitation of the present invention, the specific process of step 4) for secondary processing of surface A is as follows:

[0027] First, using the machined surfaces of several pressure plate positions processed in one machining operation on surface A as a reference, the positioning pins on the fixture are matched with several through holes to achieve precision hole positioning. The blank is pressed by the cylinder on the fixture and supported by the bottom support block of the fixture.

[0028] Then, the features of surface A, such as the large surface, inner cavity, and boss, are machined to meet the machining requirements, ensuring a cavity depth of 30.00 (+ / -0.30) mm;

[0029] Next, machine the through holes, round holes, waist holes, and threaded holes on surface A;

[0030] Finally, process the remaining features on surface A of the product drawing according to the drawing requirements.

[0031] As a further limitation of the present invention, the specific process of step 5) for secondary processing of surface B is as follows:

[0032] First, using the machined surfaces of several pressure plate positions processed in one machining operation on side B as a reference, the positioning pins on the fixture are matched with several through holes to achieve precision hole positioning. The blank is pressed by the cylinder on the fixture and supported by the bottom support block of the fixture.

[0033] Then, process the features of the B side, such as the large surface, inner cavity, boss, and heat dissipation teeth, to meet the processing requirements, ensuring a cavity depth of 30.00 (+ / -0.30) mm, and process the planar features other than the PCB cover plate surface.

[0034] Next, machine all the through holes and threaded holes on surface B;

[0035] Finally, the remaining features on surface B of the product drawing were processed to meet the requirements of the drawing.

[0036] As a further limitation of the present invention, the specific process of step 6) of performing three processing steps on surface B is as follows:

[0037] First, using surface A as a reference, the precision hole positioning is achieved by using the positioning pins on the fixture to engage with several through holes. The blank is then pressed by the cylinder on the fixture and supported by the bottom support block of the fixture.

[0038] Then, process the PCB cover plate on side B, as well as the through holes, countersunk holes, and threaded holes, and process the features of the PCB cover plate surface area.

[0039] As a further limitation of the present invention, the specific process for machining surface C1 in step 6) is as follows:

[0040] First, machine the boss surface of surface C1, then machine the precision holes, round holes, waist holes and threaded holes on surface C1, and finally machine the remaining features of surface C1 to meet the machining requirements of the drawing.

[0041] As a further limitation of the present invention, the specific process of sequentially processing surfaces C2, C3, and C4 in step 7) is as follows:

[0042] First, using surface A as a reference, install several through holes onto the positioning pins on the fixture for positioning. Then, load the long pressure plate through the mounting pins on the fixture and use the long pressure plate to press the blank.

[0043] Next, the CNC machining center is paused, and the fixture is rotated 180 degrees with the billet to machine the C2 surface gate and the countersink.

[0044] Next, pause the CNC machining center, control the fixture to rotate 90 degrees with the blank, machine the large surface of C3, machine the threaded hole of the toothed sleeve, machine the pressure plate position, and leave a 0.3mm grinding allowance;

[0045] Finally, pause the CNC machining center, control the fixture to rotate 180 degrees with the blank, machine the C4 surface and T side groove to meet the drawing requirements, machine the pressure plate position, and leave a 0.3mm grinding allowance.

[0046] As a further limitation of the present invention, the post-processing operation of the processed shell material in step 8) is specifically as follows:

[0047] First, place the product with the inner cavity facing down and magnetically grind for 3 minutes. Be careful to protect the product's appearance and prevent scratches or damage.

[0048] Then, the magnetically ground shell is clamped using a fixture, and a robotic arm is used to wet grind the shell.

[0049] Next, two dental braces were attached to the side of the shell;

[0050] Next, the shell is deburred, and the areas to be powder coated are chamfered at sharp angles. Surface debris and aluminum shavings are then blown away.

[0051] Finally, the shell is subjected to surface oxidation, powder coating, and electroplating in sequence.

[0052] Compared with the prior art, the present invention has the following advantages:

[0053] 1. The processing technology of this invention first processes the pressure plate position and positioning hole, and then uses a fixed pin for positioning and a downward pressing method, which can better ensure the stability of key dimensions and effectively ensure the processing quality of the filter housing. Compared with the floating pin positioning scheme used in the past, it can effectively avoid the problems of internal cavity hole position coordinate deviation, resonant table and cavity depth dimension instability, and coupling dimension deviation caused by unstable die-cast blank dimensions and unstable clamping.

[0054] 2. Optimize processing procedures based on product structure to save manpower, fixtures, and cutting tools, thereby reducing costs. Attached Figure Description

[0055] 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.

[0056] Figure 1 This is a schematic diagram showing the numbering of each side of the filter housing of the present invention;

[0057] Figure 2 This is a schematic diagram of the calibration operation in the CNC machining process of the present invention;

[0058] Figure 3 This is a schematic diagram of the calibration operation in the CNC machining process of the present invention;

[0059] Figure 4 This is a schematic diagram illustrating the positioning process for surface B during a single machining operation in the CNC machining process of the present invention.

[0060] Figure 5 This is a schematic diagram of clamping the blank during a single machining operation on surface B in the CNC machining process of the present invention;

[0061] Figure 6 This is a schematic diagram of the pressure plate position during a single machining operation of surface B in the CNC machining process of the present invention;

[0062] Figure 7 This is a schematic diagram of the pressure plate position during a single machining operation of surface B in the CNC machining process of the present invention;

[0063] Figure 8 This is a schematic diagram illustrating the positioning process for surface A during a single machining operation in the CNC machining process of this invention.

[0064] Figure 9 This is a schematic diagram of clamping the blank during a single machining operation on surface A in the CNC machining process of the present invention;

[0065] Figure 10 This is a schematic diagram of the pressure plate position during a single machining operation of surface A in the CNC machining process of the present invention;

[0066] Figure 11 This is a schematic diagram of the pressure plate position during a single machining operation of surface A in the CNC machining process of the present invention;

[0067] Figure 12This is a schematic diagram illustrating the positioning process for secondary machining of surface A in the CNC machining process of the present invention.

[0068] Figure 13 This is a schematic diagram illustrating the positioning process for secondary machining of surface A in the CNC machining process of the present invention.

[0069] Figure 14 This is a schematic diagram illustrating the positioning process for secondary machining of surface B in the CNC machining process of the present invention.

[0070] Figure 15 This is a schematic diagram illustrating the positioning process for secondary machining of surface B in the CNC machining process of the present invention.

[0071] Figure 16 This is a schematic diagram illustrating the positioning process for surface B during three machining operations in the CNC machining process of this invention.

[0072] Figure 17 This is a schematic diagram of machining surface C1 in the CNC machining process of the present invention;

[0073] Figure 18 This is a schematic diagram of clamping the blank when machining surfaces C2, C3, and C4 in the CNC machining process of the present invention;

[0074] Figure 19 (a), (b), (c), (d), and (e) in the diagrams are schematic diagrams of chamfering and deburring processes performed by a CNC machining center.

[0075] Figure 20 (a), (b), (c), and (d) in the diagrams are schematic diagrams of manual deburring of surfaces A, B, C1, and C2, respectively. Detailed Implementation

[0076] 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.

[0077] 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 is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0078] 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.

[0079] like Figure 1 As shown, the CNC machining process for the filter housing of the present invention first involves correcting the blank to be machined. On the correction platform, a correction fixture is used to correct the flange surface and pressure plate position of surface A to ensure that the flatness is ≤0.3mm; the bottom plane of the inner cavity is corrected to ensure that the dial gauge range is ≤0.2mm.

[0080] Specifically, first use a rubber mallet to align the flange face and pressure plate position on the alignment base plate to ensure flatness is ≤0.3mm. Figure 2 As shown, Figure 2 The black lines in the text represent the entire large surface area, indicating the alignment of the flange face and pressure plate position on side A.

[0081] Then, calibrate the bottom plane of the inner cavity to ensure that the dial indicator range is ≤0.2mm;

[0082] Finally, use a knife-edge ruler to check the two pressure plate positions in the middle of surface B to ensure that the flatness is ≤0.1mm. Figure 3 As shown by the black lines in the middle.

[0083] The specific method for using a rubber mallet to calibrate the A-side flange face and pressure plate position on the calibration base plate is as follows: Place the product on the calibration base plate and use a 0.3mm feeler gauge to insert along the edge of the product. If the feeler gauge can be inserted, it indicates that the product deformation exceeds 0.3mm, and the corresponding area needs to be tapped with the rubber mallet until the feeler gauge can no longer be inserted. It should be noted that the product must not be damaged when performing the above calibration operation, and a feeler gauge must be used to check after calibration.

[0084] After completing the above correction process, surface B is processed once.

[0085] The specific processing steps are as follows:

[0086] First, using the bottom surface of the inner cavity of surface A as a reference, install the three die-casting pre-holes 21 on the billet onto the positioning pins 11 on the fixture, and position them through the die-casting pre-holes. Then, load the long pressure plate 22 onto the fixture through the mounting pins 12, and use the long pressure plate 22 to press the billet. Figure 4 , 5 As shown;

[0087] Then, machine the end faces of the six pressure plate positions 23, ensuring that the height difference between the machined surfaces of the pressure plate positions 23 is 73.5±0.03mm, and the dimensions from the machined surface of the pressure plate position 23 to the bottom surface of the inner cavity of surface A are 36.9±0.2mm and 36.6±0.2mm respectively. Figure 6 , Figure 7 As shown;

[0088] Next, machine three Ф7.5mm (+0.05 / 0) through holes 24 for positioning in subsequent processes, such as... Figure 6 As shown.

[0089] After completing the above processing steps, surface A is processed once.

[0090] The specific processing steps are as follows:

[0091] First, using the bottom surface of the inner cavity of surface B as a reference, the three through holes 24 machined above are installed onto the positioning pins 13 on the fixture for positioning. Then, the long pressure plate 25 is loaded through the mounting pins 14 on the fixture, and the long pressure plate 25 is used to press the blank. Figure 8 , 9 As shown.

[0092] Then, machine the end faces of the six pressure plate positions 26, ensuring that the height difference between the machined surfaces of the pressure plate positions 26 is 73.5±0.03 mm. The dimensions from the machined surfaces of the pressure plate positions 26 to the bottom surface of the inner cavity are 32.1±0.2 mm and 41.4±0.2 mm, respectively. Figure 10 , Figure 11 As shown.

[0093] It should be noted that the reason why this solution involves processing surface B once, then processing surface A once and twice, and then processing surface B a second and third time, is that, on the one hand, ... Figure 4 , 5 As shown, the long pressure plate 22 presses down on the product, blocking the features on side B, making it impossible to process them all. Furthermore, because the product has a double-cavity structure, directly processing the features on side B cannot guarantee the cavity depth. This process design flow is based on the product structure and meets the dimensions specified in the drawings. The first machining of sides B and A is for milling the support and positioning parts; the second machining of side A and the second and third machining of side B are to ensure that all features meet the dimensional requirements of the drawings.

[0094] After completing the above processing steps, surface A undergoes secondary processing.

[0095] Specifically, taking the machined surfaces of the six pressure plate positions 26 processed in the first machining operation on side B as a reference, the positioning pins 13 on the fixture cooperate with the three Ф7.5 through holes 24 to achieve precision hole positioning. The blank is clamped by the cylinder on the fixture, and auxiliary support is provided by the bottom support block of the fixture. Figure 12 , 13 As shown;

[0096] Then, the large surface, inner cavity, boss and other features of surface A are machined to meet the machining requirements, ensuring a cavity depth of 30.00 (+ / - 0.30) mm;

[0097] Next, machine the through holes, round holes, waist holes, and threaded holes on surface A.

[0098] Specifically, machine 5 through holes of Ф7.5(+0.05 / 0)mm; Ф4.15(+ / -0.03)mm holes, 14mm deep round holes; machine 2 holes of Ф5.0(+0.05 / -0)mm, 27mm deep; 1 hole of Ф4.0(0 / -0.05)mm, 9mm deep; spot drill 511 holes of Ф2.75mm, 10mm deep, and make countersunk holes of Ф3.2mm, 0.6mm deep; machine 4 M14*1.0-6G threads; 4 through holes of Ф7.2(+ / -0.05)mm; machine 4 holes of Ф10.5(0 / -0.05)mm. 0.5 mm hole, 3.0 mm deep; 12 holes with a diameter of 9.22 (+ / -0.02) mm; 16 holes with a diameter of 7.22 (+ / -0.02) mm; 4 holes with a diameter of 6.22 (+ / -0.02) mm; 32 M2.5 holes, 6.0 mm deep; 8 M2.5 holes, 6.0 mm deep; 32 M3 holes, 6.0 mm deep; 20 M3 holes, 5.0 mm deep; 5 M3 holes, 6.5 mm deep; 2 M4 holes, 8.0 mm deep; 13 M4 holes, 9.0 mm deep; 4 M4 holes, 9.0 mm deep; 40 M4 holes, 7.0 mm deep.

[0099] Finally, engrave the lettering according to the drawing requirements, including the drawing number, version number, machine number, and date, and process all other features on side A of the product drawing to meet the processing requirements of the drawing.

[0100] After completing the above processing steps, surface B undergoes secondary processing.

[0101] Specifically, taking the machined surfaces of the six pressure plate positions 23 processed in one machining operation on surface A as a reference, the positioning pins 11 on the fixture cooperate with the three Ф7.5 through holes 24 to achieve precision hole positioning. The blank is clamped by the cylinder on the fixture, and auxiliary support is provided by the bottom support block of the fixture. Figure 14 , 15 As shown;

[0102] Then, process all features such as the large surface, inner cavity, boss, and heat dissipation teeth of the B side to meet the processing requirements, ensuring a cavity depth of 30.00 (+ / -0.30) mm, and process planar features other than the PCB cover plate surface;

[0103] Next, machine all through holes on surface B (machine 12 through holes with a diameter of 7.22 (+ / -0.02) mm; spot drill 590 holes with a diameter of 2.75 mm and a depth of 10 mm; countersink 3.2 mm holes with a depth of 0.6 mm), and machine low-profile grooves to ensure a width of 6.12 (+ / -0.02) mm and a depth of 6.09 (+ / -0.02) mm; and machine all threaded holes on surface B (spot drill and tap 8 M2.5 threaded holes with a depth of 5.0 mm; 32 M2.5 threaded holes with a depth of 6.0 mm; 20 M3 threaded holes with a depth of 6.0 mm; 32 M3 threaded holes with a depth of 6.0 mm; 2 M4 threaded holes with a depth of 8.0 mm; 40 M4 threaded holes with a depth of 7.0 mm; 10 M4 threaded holes with a depth of 8.5 mm).

[0104] Finally, all other features on surface B of the product drawing are processed to meet the requirements of the drawing.

[0105] After completing the above processing steps, surface B is processed three times.

[0106] Specifically, using surface A as a reference, the locating pins on the fixture engage with three Ф7.5 through holes to achieve precision hole positioning. The blank is then clamped by a cylinder on the fixture, and further supported by a bottom support block. Figure 16 As shown;

[0107] Then, process the B-side PCB cover plate by spot drilling 46 Ф2.75mm holes with a depth of 10mm; Ф3.2mm countersunk holes with a depth of 0.6mm; 72 Ф2.25mm holes with a depth of 8mm; Ф2.6 countersunk holes with a depth of 0.6mm; spot drilling and tapping 3 M2.5 threaded holes with a depth of 6.0mm, and processing all features of the PCB cover plate surface area.

[0108] Next, the CNC machining center is paused, and the fixture is rotated 90 degrees with the blank to machine the C1 surface.

[0109] Specifically, the C1 surface boss is machined by spot drilling and reaming four 9.22mm precision holes, machining a Ф6.0mm round hole and a waist hole, spot drilling and tapping 16 M3 holes (8.0mm deep), one M4 threaded hole (8.0mm deep), and four M4 threaded holes (8.0mm deep). Finally, all remaining features are machined to the drawing, such as... Figure 17 As shown.

[0110] After completing the above processing steps, C2, C3, and C4 surfaces are processed sequentially.

[0111] Specifically, first, using surface A as a reference, install the three Ф7.5 through holes onto the locating pins on the fixture for positioning. Then, load the long pressure plate using the mounting pins on the fixture, and use the long pressure plate to clamp the blank. Figure 18 As shown;

[0112] Next, the CNC machining center is paused, and the fixture is rotated 180 degrees with the billet to machine the gate on surface C2 and the countersink.

[0113] Next, pause the CNC machining center, control the fixture to rotate 90 degrees with the blank, machine the large surface of C3, tap two M8 threaded holes with a hole depth of 18mm, mill off the pressure plate position, and leave 0.3mm grinding allowance.

[0114] Finally, pause the CNC machining center, control the fixture to rotate 180 degrees with the blank, machine the C4 surface, T side groove, mill off the pressure plate position, and leave 0.3mm grinding allowance.

[0115] After completing the above processing, the processed shell material undergoes post-processing.

[0116] Specifically, first place the product with the inner cavity facing down and magnetically grind it for 3 minutes, taking care to protect the product's appearance and prevent scratches or damage;

[0117] Then, the magnetically ground shell is clamped using a general-purpose fixture, and a robotic arm is used to wet grind the shell, with each surface not exceeding 0.5 minutes.

[0118] Next, two M8 threaded rods are machined on the side of the housing;

[0119] Next, the shell is deburred, and the areas to be powder coated are chamfered at sharp angles. Surface debris and aluminum shavings are then blown away.

[0120] Finally, the shell is subjected to surface oxidation, powder coating, and electroplating in sequence.

[0121] The deburring process is divided into two parts: one part is chamfering and deburring by a CNC machining center, and the other part is deburring by hand.

[0122] The CNC machining center performs chamfering and deburring on the following parts: connector face low-profile opening, inner cavity sidewall low-profile hole, fly rod groove bottom, isolation rib edge, and inner cavity low-profile groove end, respectively as follows: Figure 19 As shown in (a), (b), (c), (d), and (e).

[0123] Specifically, the processing technology for the low-profile connector is as follows:

[0124] 1. Use a center drill with a diameter of 5mm or greater, and use the center drill to chamfer in a circular motion.

[0125] 2. The length of the tool attachment must not exceed 5 to 7 times the diameter of the tool holder.

[0126] 3. The bottom depth of the chamfered surface is ≥1.5mm.

[0127] 4. Machining parameters: spindle speed 9600 rpm, feed rate 1200 mm / min.

[0128] The machining process for the low-profile orifice on the inner cavity sidewall is as follows:

[0129] 1. Use a dovetail cutter to chamfer the edges in a rounded manner;

[0130] 2. Machining parameters: spindle speed 3200 rpm, feed rate 200 mm / min.

[0131] The machining process for the bottom of the fly rod groove is as follows:

[0132] 1. Use a center drill with a diameter of 5mm or greater, and use the center drill to chamfer in a circular motion;

[0133] 2. The length of the tool attachment must not exceed 5 to 7 times the diameter of the tool holder;

[0134] 3. The bottom depth of the chamfered surface is ≥1.5mm;

[0135] 4. Machining parameters: spindle speed 9600 rpm, feed rate 1500 mm / min.

[0136] The processing technology for the edge of the isolation rib is as follows:

[0137] 1. Use a center drill with a diameter of 5mm or greater, and use the center drill to chamfer in a circular motion;

[0138] 2. The length of the tool attachment must not exceed 5 to 7 times the diameter of the tool holder;

[0139] 3. The bottom depth of the chamfered surface is ≥1.5mm;

[0140] 4. Machining parameters: spindle speed 9600 rpm, feed rate 1500 mm / min.

[0141] The machining process for the end of the inner cavity low-pass groove is as follows:

[0142] 1. Use a center drill with a diameter of 5mm or greater, and use the center drill to chamfer in a circular motion;

[0143] 2. If the chamfer is greater than 0.3mm, roughing must be increased, leaving a 0.1mm allowance for finishing;

[0144] 3. The length of the tool attachment must not exceed 5 to 7 times the diameter of the tool holder;

[0145] 4. The depth of the chamfered bottom surface is ≥1.5mm;

[0146] 5. Machining parameters: spindle speed 9600 rpm, feed rate 1200 mm / min.

[0147] The following parts of the deburring process involve manual deburring:

[0148] Side A: The inner cavity is deburred and chamfered to ≤C0.1mm; the red side is powder-coated, sharp corners and edges are ground to R0.5-1.0 rounded corners, and the opening is chamfered to C0.5 or R0.5. Figure 20 As shown in (a);

[0149] Side B: Deburring and chamfering of the inner cavity ≤ C0.1mm; red surface powder-coated, sharp corners and edges ground to R0.5-1.0 rounded corners, chamfering of orifices C0.5 or R0.5, removal of ejector pin burrs and mold marks from heat dissipation teeth, such as... Figure 20 As shown in (b);

[0150] C1 side: The powder-coated surface with sharp corners and edges ground to a radius of R0.5-1.0 to protect the connector mounting surface (red side), such as... Figure 20 As shown in (c);

[0151] C2 surface: The sharp corners and edges of the powder-coated surface are ground into a radius of R0.5-1.0, such as... Figure 20 As shown in (d).

[0152] 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 filter housing numerical control machining process, characterized by, Comprise the following steps: 1) correct the flange surface of A surface, the inner cavity bottom surface on the correction platform, ensure that the flatness is within the preset value; The correction operation of step 1) is specifically: First, use the glue hammer head to correct the A surface flange surface and the pressing plate position on the correction bottom plate, ensure that the flatness is ≦0.3mm; Then, correct the inner cavity bottom plane, ensure that the dial gauge interval is ≦0.2mm; Finally, use the knife edge ruler to detect the pressing plate position of B surface in the middle of 2, ensure that the flatness is ≦0.1mm; 2) take the inner cavity bottom surface of A surface as the reference, process B surface once; The operation process of processing B surface once is specifically: First, take the inner cavity bottom surface of A surface as the reference, install the several places of the blanking pre-hole on the fixture on the positioning pin, position through the blanking pre-hole, then load the long pressing plate through the mounting pin on the fixture, and adopt the long pressing plate to press the blank; Then, process the end face of several pressing plate positions, ensure that the height difference of the pressing plate position machining surface is H, the size of the pressing plate position machining surface to the inner cavity bottom surface of A surface is h1, h2 respectively, and H=h1+h2; Finally, process several through holes as positioning holes for subsequent process positioning; 3) take the inner cavity bottom surface of B surface as the reference, process A surface once; The operation process of processing A surface once is specifically: First, take the inner cavity bottom surface of B surface as the reference, install the several through holes processed above on the positioning pin of the fixture for positioning, then load the long pressing plate through the mounting pin on the fixture, and adopt the long pressing plate to press the blank; Then, process the end face of several pressing plate positions, ensure that the height difference of the pressing plate position machining surface is H, the size of the pressing plate position machining surface to the inner cavity bottom surface is h3, h4 respectively, and H=h3+h4; 4) take the machining surface of several pressing plate positions processed in the first processing procedure of B surface as the reference, process A surface twice; The operation process of processing A surface twice in step 4) is specifically: First, take the machining surface of several pressing plate positions processed in the first processing procedure of B surface as the reference, realize fine hole positioning through the cooperation of the positioning pin on the fixture and several through holes, press the blank through the air cylinder on the fixture, and assist the support through the bottom support block of the fixture; Then, process the large surface, inner cavity, boss and other features of A surface to meet the processing requirements, ensure that the cavity depth is 30.00(+ / -0.30)mm; Again, process each through hole, round hole, waist hole and threaded hole of A surface; Finally, process the remaining features on the A surface of the product drawing according to the drawing requirements to meet the drawing processing requirements; 5) take the machining surface of several pressing plate positions processed in the first processing procedure of A surface as the reference, process B surface twice; The operation process of processing B surface twice in step 5) is specifically: First, take the machining surface of several pressing plate positions processed in the first processing procedure of A surface as the reference, realize fine hole positioning through the cooperation of the positioning pin on the fixture and several through holes, press the blank through the air cylinder on the fixture, and assist the support through the bottom support block of the fixture; Then, process the large surface, inner cavity, boss, heat dissipation teeth and other features of B surface to meet the processing requirements, ensure that the cavity depth is 30.00(+ / -0.30)mm, and process the plane features except the PCB cover plate surface; Thirdly, process each hole and each threaded hole on the B surface; Finally, process the remaining features on the B surface of the product drawing to meet the drawing processing requirements; 6) Take the A surface as the reference, process the B surface three times, pause the operation of the numerical control machining center, control the clamp to rotate the blank by 90 degrees, and process the C1 surface; 7) Process the C2 surface, C3 surface, and C4 surface in turn; 8) Post-process the processed shell material.

2. The filter housing numerical control machining process of claim 1, wherein: The operation process of step 6) for processing the B surface three times is as follows: First, take the A surface as the reference, realize fine hole positioning by cooperating with the positioning pins on the clamp and the through holes, press the blank by the air cylinder on the clamp, and assist the support by the bottom support block of the clamp; Then, process the PCB cover plate and each hole, counterbore, and threaded hole on the B surface, and process the features on the PCB cover plate surface area.

3. The filter housing numerical control machining process of claim 1, wherein: The operation process of step 6) for processing the C1 surface is as follows: First, process the boss surface of the C1 surface, then process the fine hole, round hole, waist hole, and threaded hole of the C1 surface, and finally process the remaining features of the C1 surface to meet the drawing processing requirements.

4. The filter housing numerical control machining process of claim 1, wherein: The operation process of step 7) for processing the C2 surface, C3 surface, and C4 surface in turn is as follows: First, take the A surface as the reference, install the through holes to the positioning pins on the clamp for positioning, then load the long pressing plate by the mounting pins on the clamp, and press the blank by the long pressing plate; Next, pause the operation of the numerical control machining center, control the clamp to rotate the blank by 180 degrees, process the pouring gate of the C2 surface, and process the sink; Again, pause the operation of the numerical control machining center, control the clamp to rotate the blank by 90 degrees, process the large surface of the C3 surface, process the mouthpiece threaded hole, process the pressing plate position, and leave a 0.3mm polishing allowance; Finally, pause the operation of the numerical control machining center, control the clamp to rotate the blank by 180 degrees, process the C4 surface and the T side surface groove to meet the drawing processing requirements, process the pressing plate position, and leave a 0.3mm polishing allowance.

5. The filter housing numerical control machining process of claim 1, wherein: The operation process of step 8) for post-processing the processed shell material is as follows: First, place the product inner cavity surface downward, and magnetically polish for 3 minutes, pay attention to protect the product appearance to prevent scratches; Then, clamp the shell after magnetic polishing by the clamp, and wet polish the shell by the mechanical hand; Again, inlay two mouthpieces on the side surface of the shell; Next, perform deburring treatment on the shell, and perform sharp corner chamfering on the positions that need to be powder coated later, and blow clean the surface debris and aluminum chips; Finally, perform surface oxidation, powder coating, and electroplating treatment on the shell in turn.

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