A method for processing a whole-seal horizontal split centrifugal compressor casing

Abstract

The application provides a whole sealing type horizontal split centrifugal compressor casing processing method, belonging to the compressor casing processing technical field, and comprising the following steps: casing rough machining, casing semi-finishing, first water pressure test, casing finishing and second water pressure test; the upper and lower horizontal middle split surfaces of the whole sealing type horizontal split centrifugal compressor casing are connected through the structure of closely arranged bolts to realize the sealing of the horizontal middle split surfaces; the whole sealing type horizontal split centrifugal compressor casing is matched with end covers of two whole sealing bodies through the hole size precision of end plates to realize the axial sealing of the casing; the processing method of the whole sealing type horizontal split centrifugal compressor casing guarantees the processing precision of the whole sealing type horizontal split centrifugal compressor casing processing process scheme from aspects of clamping alignment, processing amount control, machining stress removal, clamping deformation prevention and application of special accessories of large numerical control equipment, and can meet the technical requirements of actual production.

Description

Technical Field

[0001] This application belongs to the field of compressor housing processing technology, specifically relating to a method for processing an integrally sealed horizontally split split compressor housing. Background Technology

[0002] The three compressor units (cracking gas compressor, propylene compressor, and ethylene compressor) are the "heart" of an ethylene plant. Previously, these units all employed large, horizontally split, centrifugal compressor housings with separate sealed areas. This traditional design frequently resulted in deformation and misalignment of the separate sealing areas during practical applications, leading to difficulties in dry gas seal assembly and passing hydrostatic tests. With the ongoing localization of large-scale ethylene compressor units, the new generation of ethylene compressor units has undergone a completely new structural design to meet the requirements of larger stator housings, lighter weight, high pressure resistance, and low-temperature operation. This new design utilizes an integrally sealed, horizontally split, centrifugal compressor housing to fundamentally solve these problems from the housing structure perspective.

[0003] Since the large ethylene compressor unit adopted a lightweight structural design with a horizontally split casing combined with an integral sealing area end cover for the first time, higher requirements were put forward for the processing scheme of the integral sealing horizontally split self-contained compressor casing and the control of casing deformation. The traditional processing scheme of horizontally split casing can no longer meet the needs of processing the integral sealing horizontally split self-contained compressor casing. Summary of the Invention

[0004] This application aims to address at least one of the technical problems existing in the prior art or related technologies.

[0005] Therefore, this application proposes a method for machining the casing of an integrally sealed horizontally split-type compressor, including: rough machining, semi-finishing, and finishing of the casing; marking the center-parting surface machining lines, and rough milling the center-parting surfaces of the upper and lower casings; marking the machining lines for the inner holes and inner end faces of the casing, as well as the machining lines for each hole on the horizontal center-parting surface of the casing, machining the mating holes on the horizontal center-parting surface, and rough milling the inner holes, stops, and various parts of the casing cavity of the end plates at both ends of the casing; semi-finish milling the center-parting surfaces of the upper and lower casings, and semi-finish milling the inner holes of the end plates, the inner end faces that fit with the end covers, and the stops. Semi-finish milling of all parts of the machine housing cavity; machining the bolt holes for the end plates and end caps at both ends of the machine housing; continuing to machine the horizontal center split surface fitting holes; assembling the upper and lower machine housings and boring the balance air holes in the machine housing; assembling and welding all parts inside the machine housing cavity; finish milling the center split surfaces of the upper and lower machine housings; assembling the upper and lower machine housings and installing the bearing caps; finish boring the positioning inner holes for the side end plates and end caps, the inner end faces for fitting with the end caps, and the outer circle stop of the end caps; continuing to machine the fitting holes for fitting with the end caps at both ends of the machine housing; finish milling of all parts of the machine housing cavity; then grinding, cleaning, and inspecting all parts inside and outside the machine housing.

[0006] In one feasible implementation, the method for machining the casing of an integrally sealed horizontally split split compressor further includes:

[0007] First and second hydrostatic tests; after the semi-finished machining of the casing is completed, a hydrostatic test is performed on the casing cavity after semi-finished machining.

[0008] After the casing is precision machined, the left and right end covers are installed, and the casing cavity is precision machined and then subjected to a water pressure test.

[0009] In one feasible implementation, the casing is rough-machined as follows: First, the machining lines for the split flange of the casing are drawn, and the machining lines for the inlet and outlet flange planes of the casing are drawn; then, the split surfaces of the upper and lower casings are rough-milled, and the inlet and outlet flange planes of the lower casing are rough-milled; next, the machining lines for the inner holes and inner end faces of the casing, as well as the machining lines for each hole on the horizontal split surface of the casing are drawn; then, the mating holes on the horizontal split surface of the casing are machined, and the inner holes and stops of the end plates at both ends of the casing are rough-milled, as well as the positioning platforms in the abdominal cavity of the casing and the positioning platforms in the abdominal cavity of the lower casing are machined; finally, the machining stress and welding residual stress generated by rough machining are eliminated; and sandblasting is used to remove the oxide substances generated by stress relief.

[0010] Semi-finishing of the casing: First, semi-finish mill the split surfaces of the upper and lower casings, then semi-finish mill the inner holes of the end plates, the inner end faces and stops that fit with the end caps, and the various parts of the casing cavity. Next, semi-finish mill the flange planes of each air outlet and the stops of each air duct flange on the lower casing. Threads are machined into the fitting holes on the horizontal split surface of the casing. The bolt holes for fitting the end plates and end caps at both ends of the casing are machined. Then, the machining lines for the holes on the flange planes of the air inlet and outlet of the casing are drawn, as are the machining lines for the through holes in the cavities of the upper and lower casings. The through holes in the casing cavity are then machined. Finally, the various connecting pipes, elbows, and corresponding end flanges that connect with the casing cavity are assembled and welded. The welds are then inspected by radiography and ground.

[0011] Precision machining of the casing: First, precision mill the center split surface of the upper casing, then precision mill the inlet and outlet flange planes of the lower casing, and finally precision mill the center split surface and flange plane of the lower casing. Then, assemble the upper and lower casings, precision bore the positioning inner holes of the side end plates and end caps, the inner end faces of the end plates and end caps, and the outer circle stop of the end caps, and machine the end cap mating holes at both ends of the casing. Next, precision mill all parts of the upper casing cavity and all parts of the lower casing cavity. Finally, grind, clean, and inspect all parts inside and outside the casing.

[0012] In one feasible implementation, the rough machining of the housing also includes:

[0013] Before marking the machining line of the split surface, use the machine tool work platform, with the split surface as the mounting base for the upper and lower machine housings respectively, and use jacks to support the workpiece. Adjust the jacks and use the back of the flange of the split surface of the machine housing as the reference to level it. Then mark the machining line of the flange of the split surface of the machine housing, and mark the machining lines of the flange plane of the air inlet and outlet of the machine housing.

[0014] When rough milling the split surface of the upper housing, the split surface of the upper housing should be facing upwards. The square box supports the back of the flange of the split surface of the upper housing. Wedges are placed at the four corners of the housing. The wedges are adjusted to level the housing according to the split surface line. The pressure plate is pressed against the inner hole of the end plate at both ends of the upper housing. The bottom of the pressure plate is supported. Then, the split surface of the upper housing is rough milled, leaving a margin. The surface roughness is Ra6.3.

[0015] When rough milling the center section of the lower casing, the center section of the lower casing is used as the installation reference surface. Wedges are placed at the four corners of the lower casing. The wedges are adjusted and the center section line of the lower casing is pressed down to level it. The pressure plate is pressed against the back of the flange of the center section of the lower casing. Then, the inlet and outlet flange planes of the lower casing are rough milled, leaving a margin, and the surface roughness reaches Ra6.3. Then, the casing is hoisted and flipped over, with the air duct flange surface as the installation reference surface. The pressure plate is pressed against the back of the air duct flange, and the center section of the lower casing is rough milled, leaving a margin of 5mm, with a surface roughness of Ra6.3.

[0016] In one feasible implementation, marking the machining lines for the inner hole and inner end face of the housing, as well as the machining lines for each hole on the horizontal split surface of the housing, includes: considering the machining allowance of each part of the upper housing, marking axial and radial alignment lines at the inner hole and end face of the upper housing; considering the machining allowance of each part of the lower housing, marking axial and radial alignment lines at the inner hole and split surface of the lower housing.

[0017] In one feasible implementation, the rough milling of the inner holes and stops of the end plates at both ends of the machine housing, the various parts of the positioning platform in the machine housing cavity, and the various parts of the positioning platform in the lower machine housing cavity include:

[0018] When rough milling the upper housing, the split surface of the upper housing should face upwards. The square box supports the back of the flange on the split surface of the upper housing. Wedges should be placed at the four corners of the upper housing. Adjust the wedges and level the upper housing according to the split surface line. Draw axial and radial lines according to the positions of the inner holes and end faces at both ends of the upper housing to align it. Press the pressure plate to the lowest point of the inner hole of the end plate at both ends of the upper housing. Provide support at the bottom of the pressure plate position. Considering the allowance of the split surface, rough machine the horizontal split surface of the upper housing to make the mating hole. Rough mill the inner holes of the end plates at both ends of the upper housing and the stop of the inner end face of the end plate, leaving allowance on one side. Rough mill all parts of the positioning platform in the abdominal cavity of the upper housing, leaving allowance on one side.

[0019] When rough milling the lower housing, with the center split surface of the lower housing facing upwards, press down on the center split surface line to level it, and then press down on the inner hole and end face positions of the housing to draw axial and radial lines for alignment; press the pressure plate to the back of the inlet and outlet flanges, support legs, and the back of the center split surface:

[0020] Roughly machine the bottom hole of the horizontal split surface of the lower housing and tap the thread; rough mill the inner holes of the end plates at both ends of the lower housing and the stop of the inner end face of the end plates, leaving a margin; rough mill all parts of the positioning platform in the abdominal cavity of the lower housing, leaving a margin on one side.

[0021] In one feasible implementation, the semi-finishing of the housing further includes:

[0022] When semi-finish milling the upper housing, the split surface of the upper housing should face upwards. The square box supports the back of the flange on the split surface of the upper housing. Shims should be used to adjust the four corners of the back of the flange on the split surface of the upper housing. The upper housing should be leveled according to the machined split surface. The pressure plate should be pressed tightly to the lowest point of the inner hole of the end plates at both ends. The bottom of the pressure plate should provide support.

[0023] Semi-finish mill the center split surface of the upper housing, leaving machining allowance; loosen the pressure plate and check the flatness of the center split surface with a dial indicator, ensuring it meets the design drawing requirements and the surface roughness reaches Ra3.2; level the center split surface of the housing and align the inner holes of the end plates at both ends; press the pressure plate tightly against the center split surface of the housing, with support at the bottom of the pressure plate to prevent deformation of the housing during mounting; considering the allowance for the center split surface, enlarge the bolt holes on the horizontal center split surface of the upper housing, leaving reaming allowance; ream the bolt holes on the horizontal center split surface; considering the allowance for the center split surface and all other parts, semi-finish mill the end plates. The inner hole, the inner end face of the end cap, and the stop are all left with a single-sided allowance; the surface roughness of the test pressure surface reaches Ra3.2; considering the center parting surface and the allowance of each part, semi-finish mill each part of the upper housing cavity, leaving an allowance; considering the allowance of the upper and lower center parting surfaces, adjust the machine tool to the center line of the ideal state of the housing design, and mark the bolt holes of the end plates and end caps at both ends of the housing; drill the bolt holes of the end plates and end caps at both ends of the housing, machining one grade smaller; loosen the pressure plate and check the form and position tolerances of the upper housing center parting surface and sealing surface;

[0024] When semi-finish milling the lower housing, use the center section of the lower housing as the installation reference surface. Place wedges at the four corners of the center section of the lower housing, adjust the wedges, and level it according to the machined center section of the lower housing. Press the pressure plate firmly against the back of the flange of the center section of the lower housing.

[0025] Semi-finish mill the flange planes of each air outlet on the casing, leaving allowance on each side; loosen the pressure plate, check the flange planes with a dial indicator, and ensure they meet the design drawing requirements with a surface roughness of Ra3.2; considering the flange plane allowance, mill the flange stops of each air duct.

[0026] Hoist and flip the casing, using the inlet and outlet flange planes of the lower casing as the installation base surface. Level the lower casing according to the machined center split surface, press the back of the inlet and outlet flanges with the pressure plate, and support the back of the center split surface.

[0027] Semi-finish mill the center split surface of the lower housing, leaving a 1mm machining allowance; loosen the pressure plate, use a dial indicator to check the flatness of the center split flange, check the flatness of the center split surface to meet the design drawing requirements, and the roughness to Ra3.2; adjust the inlet and outlet flanges with shims, level the center split surface of the lower housing, align it according to the inner holes of the end plates at both ends, press the pressure plate to the back of the inlet and outlet flanges, and support the back of the center split surface; considering the allowance of the lower housing center split surface, enlarge the bottom hole of the screw hole of the lower housing center split surface, and mill the horizontal center of the lower housing. The split-face screw hole is threaded; considering the split face and the allowance of each part, the inner holes of the end plates at both ends and the inner end face stop of the end plates are semi-finish milled, with allowance on one side; the surface roughness of the test press reaches Ra3.2; considering the split face and the allowance of each part, the lower housing cavity is semi-finish milled according to the drawing, with allowance; considering the split face allowance, the machine tool is adjusted to the center line of the ideal state of the housing design, and the bolt holes of the end plates and end covers at both ends of the housing are marked; the bolt holes of the end plates and end covers at both ends of the housing are drilled one gear smaller.

[0028] In one feasible implementation, after marking the machining lines for the holes on the plane of the air inlet and outlet flanges of the housing, the process includes:

[0029] Drill the casing, using the middle section of the casing as the mounting base. Press the pressure plate against the back of the middle section of the casing, taking into account the machining allowance of each part of the flange: rough drill each hole on the inlet and outlet flange; enlarge each hole on the inlet and outlet flange, leaving a reaming allowance; drill and ream each hole on the inlet and outlet flange.

[0030] Mill the casing, using the inlet and outlet flange surfaces of the casing as the base surface, adjust the inlet and outlet flange gaskets, press down the center split surface of the casing to level it, and align the inner holes of the two end plates; press the pressure plate tightly against the back of the inlet and outlet flanges to support the back of the center split surface:

[0031] Check the form and position tolerances of the inner end face of the split surface and the test pressure sealing surface of the housing; mill the inclined surface of the split surface of the housing; drill the drain hole and recess of the housing.

[0032] Mill the upper housing, using the middle surface of the upper housing as the installation reference surface. Place wedges at the four corners of the middle surface of the housing, adjust the wedges, and level the housing according to the machined middle surface. Press the pressure plate to tighten the back of the flange of the middle surface of the housing. Considering the middle surface and the allowance of each part, bore the through holes in the cavities of the upper and lower housings.

[0033] Assemble and weld various pipes, elbows and corresponding end flanges in the casing cavity; perform radiographic inspection on the welds; shape; grind the welds.

[0034] In one feasible implementation, the housing finishing process further includes:

[0035] Test gauges were applied to the split surface of the upper and lower housings and the inner end face of the test pressure sealing surface, respectively.

[0036] Mill the upper housing, with the split surface of the upper housing facing upwards. Support the back of the flange on the split surface of the upper housing with a square box. Adjust the four corners of the flange on the back of the split surface of the housing with shims. Level the housing according to the split surface. Press the pressure plate to the inner hole position of the end plates at both ends. Provide support at the bottom of the pressure plate position. Precision mill the split surface of the upper housing to meet the design requirements. Loosen the pressure plate and check the flatness of the split surface to meet the design drawing requirements.

[0037] Mill the lower housing, using the center section of the lower housing as the installation reference surface. Place wedges at the four corners of the center section of the housing, adjust the wedges, and level the housing according to the center section. Press the pressure plate firmly against the back of the flange on the center section of the housing.

[0038] Mill the inlet and outlet flange planes of the lower housing, loosen the pressure plate, and check the flatness of the inlet and outlet flanges to meet the design drawing requirements; turn the housing so that the inlet and outlet flanges are the installation reference surfaces, and press the pressure plate to the back of the inlet and outlet flanges; mill the middle parting surface and flange plane of the lower housing, and check the flatness of the middle parting surface to meet the design drawing requirements;

[0039] Align the lower housing with the center split surface and the inner holes at both ends; mill the alignment plane on the flange side of the center split surface of the lower housing to a roughness of Ra3.2; assemble the upper and lower housings and install the locating pins; use a rotary table and cutter head to precision bore the locating inner hole of one end plate and end cover, the inner end face that engages with the end cover, and the outer circle stop of the end cover; rotate the worktable 180° and use a rotary table and cutter head to precision bore the locating inner hole of the other end plate and end cover, the inner end face that engages with the end cover, and the outer circle stop of the end cover; ream and ream the bolt holes at both ends of the housing that engage with the end cover; drill the bottom holes of each set screw hole on both ends of the housing and tap the threads.

[0040] In one feasible implementation, precision milling of the upper housing cavity and precision milling of the lower housing cavity further include:

[0041] Mill the upper housing, with the split surface of the upper housing facing upwards. Support the back of the flange on the split surface of the upper housing using a square box. Adjust the four corners of the flange on the back of the split surface by placing shims. Level the housing according to the split surface and align it with the inner holes of the precision-machined end plates at both ends. Press the pressure plate firmly against the inner holes of the end plates at both ends. Provide support at the bottom of the pressure plate to prevent deformation of the housing.

[0042] Precision milling of all parts of the upper housing cavity;

[0043] Mill off the casing. Using the inlet and outlet flange surfaces of the casing as the base surface, adjust the gaskets on the inlet and outlet flanges. Press down on the split surface of the casing to level it. Align it according to the inner holes of the end plates at both ends. Press the pressure plate firmly against the back of the inlet and outlet flanges.

[0044] Precision milling of all parts of the lower housing cavity; milling of the inclined surface of the lower housing split surface;

[0045] Then, grind, clean, and inspect all parts inside and outside the casing.

[0046] The method for machining the casing of an integrally sealed horizontally split split compressor disclosed in this application has the following advantages compared with the prior art:

[0047] The integrally sealed horizontally split compressor housing differs significantly from the traditional horizontally split compressor housing in both mechanical and sealing structures. The manufacturing method for this integrally sealed horizontally split compressor housing is as follows:

[0048] 1. The outer panel of the integral sealed horizontal split compressor casing is thinner than that of the traditional horizontal split casing. The positioning platform of the partition plate inside the casing cavity is produced by removing material from the outer panel, which effectively achieves the lightweight design of the large casing.

[0049] 2. The end plates of the integrally sealed horizontally split split compressor casing have a large-diameter internal bore structure, and the maximum machining positioning size can reach φ1600. The diameter of the compressor is close to the size of the casing cavity, which increases the internal space of the cavity and helps to improve the performance of the compressor. This makes the compressor more adaptable to harsh operating conditions such as high pressure and low temperature, and meets the actual use needs.

[0050] 3. The upper and lower horizontal split-type compressor housing is sealed by a structure of closely spaced bolts to achieve the sealing of the housing split surfaces. The horizontal split surfaces are also sealed by a horizontal accuracy of 0.02mm and a roughness of Ra1.6.

[0051] 4. The casing of the integrally sealed horizontal split-type compressor is matched with the end caps of the integral sealing body at both ends by the dimensional accuracy of the inner hole of the end plate, and the axial sealing of the casing is achieved by the vertical accuracy of the inner end face of the end plate of 0.03mm and the roughness Ra1.6.

[0052] 5. The coaxiality of the inner holes at both ends of the casing of the integrally sealed horizontal split-type compressor can reach 0.02mm to ensure stable operation of the unit;

[0053] Traditional horizontally split housing machining methods are no longer suitable for machining integrally sealed horizontally split self-contained compressor housings. This new machining method for integrally sealed horizontally split self-contained compressor housings ensures machining accuracy from multiple aspects, including clamping and alignment, machining parameter control, machining stress removal, prevention of clamping deformation, and the application of special accessories for large CNC equipment. It can meet the technical requirements of actual production. Attached Figure Description

[0054] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0055] Figure 1 A schematic flowchart illustrating a method for processing the casing of an integrally sealed horizontally split split compressor according to an embodiment of this application;

[0056] Figure 2 This is a first design drawing of an integrally sealed horizontally split split compressor housing according to an embodiment of this application;

[0057] Figure 3 This is a second design drawing of an integrally sealed horizontally split split compressor housing according to one embodiment of this application;

[0058] in, Figures 1 to 3 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0059] 10. Upper housing; 11. Lower housing; 12. Left end cover; 13. Right end cover; 14. End plate; 15. Air duct flange; 16. Support leg; 17. Center split flange. Detailed Implementation

[0060] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0061] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0062] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0063] The preferred embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0064] See also Figure 1 As shown in the embodiment of this application, a method for processing an integrally sealed horizontally split split compressor housing includes the following steps:

[0065] S100, rough machining of the casing:

[0066] S101, First scribing: Scribing the center parting line. Due to the excessive size of the machine housing, it is impossible to scribing the machine housing on a regular scribing platform. Therefore, a large CNC gantry milling machine platform is used instead of a scribing platform. The equipment operator works with a scribing fitter to scribing the upper and lower machine housings with the help of the machine tool.

[0067] Using the machine tool's work platform, with the upper and lower housings respectively using the split surface as the mounting base, the workpiece is supported by jacks. The jacks are adjusted, and the surface is leveled using the back of the flange on the split surface of the housing as a reference. Lines are then drawn according to the dimensions in the drawing.

[0068] S101.1, mark the machining line for the split flange on the housing;

[0069] S101.2, Draw the machining line for the split flange in the housing;

[0070] S101.3, mark the machining lines for the air inlet and outlet flanges of the casing;

[0071] S101.4, Draw the machining lines on the plane of the support leg.

[0072] S102, rough milling of the dividing surface:

[0073] For the upper casing:

[0074] S102.1, with the center section of the upper housing facing upwards, the square box supports the back of the flange on the center section of the upper housing. Wedges are placed at the four corners of the housing. The wedges are adjusted to level the housing according to the center section line. The pressure plate is pressed tightly against the inner hole of the end plates at both ends of the housing. The bottom of the pressure plate is supported to prevent the housing from deforming under pressure during installation.

[0075] S102.2, rough mill the split surface of the upper housing, leaving a margin, roughness Ra6.3;

[0076] Regarding the lower casing:

[0077] S102.3, the center plane of the lower housing is the installation reference plane. Wedges are placed at the four corners of the housing. Adjust the wedges and level the housing according to the center plane line. Press the pressure plate to the back of the flange on the center plane of the housing.

[0078] S102.4, rough mill the inlet and outlet flange planes of the lower casing, leaving a margin, with a roughness of Ra6.3;

[0079] S102.5, rough mill the leg plane, leaving allowance, with a surface roughness of Ra6.3;

[0080] S102.6, hoisting and tilting the casing, using the duct flange face as the installation reference surface, and pressing the pressure plate against the back of the duct flange:

[0081] S102.7, rough mill the split surface of the lower housing, leaving a margin, roughness Ra6.3.

[0082] S103, Second scribing: Due to the excessive size of the machine housing, it is no longer possible to scribing the machine housing on a regular scribing platform. Therefore, a large CNC gantry milling machine platform is used instead of a scribing platform. The equipment operator works with a scribing fitter to scribing the upper and lower machine housings with the assistance of the machine tool.

[0083] For the upper casing:

[0084] S103.1, Considering the machining allowance of each part of the upper housing, draw axial and radial lines on the inner hole and end face of the upper housing;

[0085] S103.2, Mark the machining lines for the inner hole and inner end face of the housing;

[0086] S103.3, Draw the machining lines for each hole on the horizontal split surface of the housing;

[0087] Regarding the lower casing:

[0088] S103.4, taking into account the machining allowance of each part of the lower housing, draw axial and radial alignment lines at the inner hole and the split surface of the lower housing;

[0089] S103.5, Draw the machining lines for the inner hole and inner end face of the housing;

[0090] S103.6, Draw the machining lines for each hole on the horizontal split surface of the housing.

[0091] S104, rough milling of upper and lower housings:

[0092] For the upper casing:

[0093] S104.1, with the split surface of the upper housing facing upwards, the square box supports the back of the flange on the split surface of the upper housing. Wedges are placed at the four corners of the housing. Adjust the wedges and level the housing according to the split surface line. Mark the axial and radial lines according to the position of the inner hole and end face of the housing for alignment. Press the pressure plate firmly against the lowest point of the inner hole of the end plate at both ends of the housing. Provide support at the bottom of the pressure plate position to prevent deformation of the housing during installation.

[0094] S104.2, mark the holes and recesses on the split surface of the housing;

[0095] S104.3, considering the allowance of the split surface, according to the drawing and the design drawing, the horizontal split surface of the machine housing is machined and drilled to form the mating hole, which is one size smaller than the design drawing size.

[0096] S104.4, taking into account the allowance of the split surface, drill and tap the disassembly screw holes according to the drawing and the recess, and process them one size smaller than the design drawing size, with the depth meeting the design drawing requirements;

[0097] S104.5, considering the allowance of the split surface, process positioning pin holes smaller than the finished tapered pin size are machined according to the drawing and the notch.

[0098] S104.6, rough mill the inner holes and stops of the end plates at both ends of the upper housing, leaving a allowance on one side;

[0099] S104.7, rough mill all parts of the positioning table in the upper housing cavity, leaving allowance on one side;

[0100] S104.8, cleaning and grinding, removing burrs and flash, removing oil and iron filings;

[0101] S104.9, flip the upper housing, with the split surface of the housing facing down, and place it on the leveling pad with the split surface of the housing as the mounting base. Use the pressure plate to press the back of the flange on the split surface of the housing.

[0102] S104.10, Drill the empty tool holes for disassembly screws to meet the requirements of the design drawings;

[0103] S104.11, drill the housing pin holes and empty tool holes, countersink the recesses, and meet the design drawing requirements;

[0104] S104.12, cleaning and grinding, removing burrs, oil stains and iron filings.

[0105] Regarding the lower casing:

[0106] S104.13, with the lower housing center surface facing upwards, level the housing according to the center surface line, and mark the axial and radial lines according to the position of the housing inner hole and end face for alignment; press the pressure plate tightly against the back of the air inlet and outlet flanges, support the legs and the back of the center surface to prevent the housing from deforming during installation:

[0107] S104.14, mark each hole and recess on the split surface of the housing;

[0108] S104.15, considering the allowance of the split surface, according to the drawing and the design drawing, the bottom hole of the horizontal split surface of the housing is machined one size smaller than the design drawing size, and the thread is tapped;

[0109] S104.16, Considering the allowance of the split surface, process positioning pin holes smaller than the finished tapered pin size are machined according to the drawing and the notch.

[0110] S104.17, rough mill the inner holes and stops at both ends of the machine housing, leaving a margin;

[0111] S104.18, rough mill all parts of the positioning platform in the lower housing cavity, leaving allowance on one side.

[0112] S200, stress relief and sandblasting:

[0113] S201, Stress Relief: Eliminates machining stress generated during rough machining and residual welding stress.

[0114] S202, sandblasting: removes oxidizing substances generated during stress relief.

[0115] S300, semi-finished casing:

[0116] S301, First Semi-finish Milling:

[0117] For the upper casing:

[0118] S301.1, with the split surface of the upper housing facing upwards, the square box supports the back of the flange on the split surface of the upper housing. Adjust the four corners of the flange on the back of the split surface by using shims. Level the upper housing according to the machined split surface. Press the pressure plate firmly against the lowest point of the inner hole of the end plates at both ends. Provide support at the bottom of the pressure plate to prevent deformation of the housing during mounting.

[0119] S301.2, semi-finish mill the split surface of the upper housing, leaving machining allowance; loosen the pressure plate, use a dial indicator to check the flatness of the split surface, and ensure it meets the design drawing requirements, with a surface roughness of Ra3.2;

[0120] S301.3, Level the casing according to the split surface, and align it according to the inner holes of the end plates at both ends. The dial indicator value should be less than 0.02mm. Provide support at the bottom of the pressure plate to prevent deformation of the casing during installation.

[0121] S301.4, considering the allowance of the split surface, enlarge the bolt holes on the horizontal split surface of the upper housing, leaving allowance for reaming; countersink the holes to meet the design drawing requirements; ream the bolt holes on the horizontal split surface to meet the design drawing requirements;

[0122] S301.5, considering the allowance of the split surface, drill and ream the positioning pin hole; machine the pin hole and the empty tool hole;

[0123] S301.6, Drilling and tapping set screw holes; Machining set screw holes and empty tool holes;

[0124] S301.7, considering the split surface and allowances of each part, the inner hole of the end plate, the inner end face of the end cover and the stop are semi-finish milled, and allowances are left on one side; the surface roughness of the test pressure surface reaches Ra3.2;

[0125] S301.8, considering the split surface and the allowance of each part, semi-finish mill each part of the upper housing cavity according to the drawing, leaving allowance;

[0126] S301.9, considering the allowance of the upper and lower center split surfaces, adjust the machine tool to the center line of the ideal state of the machine housing design, and mark the bolt holes of the end plates and end covers at both ends of the machine housing according to the drawing;

[0127] S301.10, according to the drawing and the hole, the bolt holes of the end plates and end covers at both ends of the drill housing are machined one size smaller to meet the process requirements; the countersinking hole is made to meet the dimensions of the design drawing;

[0128] S301.11, Cleans burrs and removes oil and metal filings.

[0129] S301.12, Loosen the pressure plate, and the operator, together with the inspector, checks the form and position tolerances of the split surface and sealing surface of the machine casing and fills in the form.

[0130] Regarding the lower casing:

[0131] S301.13, the following is the installation reference surface of the housing split surface. Wedges are placed at the four corners of the housing split surface. Adjust the wedges to level the housing split surface according to the machined housing split surface. Press the pressure plate to the back of the housing split surface flange:

[0132] S301.14, semi-finish mill the flange planes of each air outlet on the lower casing, leaving allowance on each side; loosen the pressure plate, check the flange planes of the air outlets with a dial indicator, and ensure that they meet the design drawing requirements with a surface roughness of Ra3.2;

[0133] S301.15, taking into account the flange plane allowance, mill the flange stop of each air duct to meet the design drawing requirements;

[0134] S301.16, hoist and flip the casing. Use the inlet and outlet flange planes of the lower casing as the installation base. Level the lower casing according to the machined split surface. Press the back of the inlet and outlet flanges with the pressure plate and support the back of the split surface to prevent the casing from being deformed during installation.

[0135] S301.17, semi-finish mill the split surface of the lower housing, leaving machining allowance; loosen the pressure plate, use a dial indicator to check the flatness of the split flange, check the flatness of the split surface to meet the design drawing requirements, and the roughness to Ra3.2;

[0136] S301.18, use shims to adjust the inlet and outlet flanges, press down the split surface of the housing to level it, align it according to the inner holes of the end plates at both ends, press the pressure plate to the back of the inlet and outlet flanges, support the back of the split surface, and prevent the housing from deforming during installation.

[0137] S301.19, taking into account the allowance of the split surface of the housing, enlarge the bottom hole of the screw hole on the split surface of the housing, and mill the thread of the screw hole on the horizontal split surface of the housing to meet the design drawing requirements;

[0138] S301.20, considering the split surface and the allowance of each part, the inner holes of the end plates at both ends and the inner end face stop of the end plate and end cover are semi-finish milled, with allowance left on one side; the surface roughness of the test pressure reaches Ra3.2;

[0139] S301.21, considering the center plane and the allowance of each part, semi-finish mill each part of the machine housing cavity according to the drawing, leaving allowance;

[0140] S301.22, Considering the centering allowance, adjust the machine tool to the center line of the ideal state of the machine housing design, and connect the bolt holes of the end plates and end covers at both ends of the machine housing as shown in the figure.

[0141] S301.23, Install the drill bit according to the drawing, and align the bolt holes of the end plates and end covers at both ends of the drill housing with the smaller end plates to meet the process requirements; countersink the drill bit to meet the dimensions in the design drawing.

[0142] S302, underlined:

[0143] S302.1, mark the machining lines for the holes on the flange plane of the air inlet and outlet of the housing;

[0144] S302.2, draw the slag discharge hole lines inside the abdominal cavity of the upper and lower casings.

[0145] S303, Drilling:

[0146] Regarding the lower casing:

[0147] S303.1, the following housing split surface is the mounting base surface, the pressure plate presses against the back of the housing split surface, taking into account the machining allowance of each part of the flange:

[0148] S303.2, Rough drilling: all holes on the inlet and outlet flanges;

[0149] S303.3, Reaming: Leave reaming allowance for each hole on the inlet and outlet flanges;

[0150] S303.4, drill and ream the holes on the inlet and outlet flanges, and countersink the flat seats of each hole.

[0151] S303.5, the upper and lower housings are assembled, and the upper housing is drilled and the lower housing is reamed according to the process of drilling and reaming the horizontal center split surface of the lower housing to make direct pin holes.

[0152] S304, Second semi-finish milling:

[0153] Regarding the lower casing:

[0154] S304.1, using the inlet and outlet flange faces of the casing as the base surface, adjust the inlet and outlet flange gaskets, press down the split surface of the casing to level it, align the inner holes of the end plates at both ends, press the pressure plates to tighten the back of the inlet and outlet flanges, and provide symmetrical support on the four outlet positions, supporting the back of the split surface:

[0155] S304.2, The operator shall cooperate with the inspector to check the form and position tolerances of the inner end face of the split surface of the housing and the pressure test sealing surface, and fill in the form;

[0156] S304.3, Mill the inclined surface of the split surface of the machine housing; retain the dial indicator plane;

[0157] S304.4, Drill through holes in the abdominal cavity of the casing;

[0158] For the upper casing:

[0159] S304.5, the split surface of the housing is used as the installation reference surface. Wedges are placed at the four corners of the split surface of the housing. Adjust the wedges to level the housing according to the machined split surface. Press the pressure plate to the back of the flange on the split surface of the housing.

[0160] S304.6, considering the split surface and the allowance of each part, bore the plane of the balance air hole boss on the upper housing;

[0161] S304.7, taking into account the center plane and the allowance of each part, bore all through holes of the upper housing and countersink the recesses to meet the design drawing requirements.

[0162] S305 involves assembling and welding various pipes, elbows, and corresponding end flanges in the casing cavity; performing radiographic inspection on the welds; shaping; and grinding the welds.

[0163] S400, First hydrostatic test: Using the test fixture, the casing cavity was semi-finished according to the pressure test instructions and then subjected to hydrostatic test. The test pressure was 1.5 times the design pressure.

[0164] S500, casing precision machining:

[0165] S501, first finish milling:

[0166] S501.1, Perform dialing on the split surface of the upper and lower housings and the inner end face of the pressure test sealing surface respectively, and record the dialing data;

[0167] For the upper casing:

[0168] S501.2, with the split surface of the upper housing facing upwards, the square box supports the back of the flange on the split surface of the upper housing. Adjust the four corners of the flange on the back of the split surface by using shims. Level the housing according to the split surface. Press the pressure plate firmly into the inner holes of the end plates at both ends. Provide support at the bottom of the pressure plate to prevent deformation of the housing.

[0169] S501.3, mill the split surface of the upper housing to meet the design requirements, loosen the pressure plate, check the flatness of the split surface to meet the design drawing requirements;

[0170] S501.4, positioning pin hole using reaming and boring processes;

[0171] Regarding the lower casing:

[0172] S501.5, the center section of the lower housing is the installation reference surface. Wedges are placed at the four corners of the center section of the housing. Adjust the wedges to level the housing according to the center section. Press the pressure plate to the back of the flange on the center section of the housing.

[0173] S501.6, mill the inlet and outlet flanges of the lower housing to meet the design drawing requirements, loosen the pressure plate, and check the flatness of the inlet and outlet flanges to meet the design drawing requirements;

[0174] S501.7, the precision milling of the housing positioning key meets the design drawing requirements;

[0175] S501.8, reverse the orientation, with the inlet and outlet flanges of the casing as the installation reference surface, and press the pressure plate to the back of the inlet and outlet flanges;

[0176] S501.9, precision mill the split surface and flange plane of the lower housing to meet the design drawing requirements, and check the flatness of the split surface to meet the design drawing requirements;

[0177] S501.10, according to the process of drilling and reaming the horizontal split surface of the lower housing, the upper housing is equipped with a direct pin hole;

[0178] S501.11, Clean burrs and remove oil and metal filings.

[0179] S502, Boring:

[0180] S502.1, Align the lower housing with the center split and the inner holes at both ends;

[0181] S502.2, Mill the alignment plane on the side of the split flange in the lower housing, with a surface roughness of Ra3.2;

[0182] S502.3, Assemble the upper and lower housings and install the positioning pins; fine boring is only permitted after the inspection is passed, and records are made during the inspection.

[0183] S502.4, using a flat rotary table and a cutter head to precision bore one side of the end plate and the end cover positioning inner hole, the inner end face of the end cover and the outer circle stop of the end cover respectively, to meet the design drawing requirements;

[0184] S502.5, the worktable is rotated 180°, and the other end plate and end cover positioning inner hole, the inner end face of the end cover and the outer circle stop of the end cover are precision bored using a flat rotary table and a cutter head, respectively, to meet the design drawing requirements;

[0185] S502.6, according to the drawing, expand and ream the bolt holes at both ends of the machine housing and the end cover to meet the design drawing requirements;

[0186] S502.7, drill the bottom holes of each set screw hole on both ends of the machine housing according to the drawing, and tap the threads; machine the empty tool to meet the design drawing requirements.

[0187] S503, second finish milling:

[0188] For the upper casing:

[0189] S503.1, with the center split facing upwards, the back of the center split flange on the upper part of the square box support is adjusted with shims at the four corners of the back of the center split flange. The surface is leveled according to the center split of the housing, and aligned with the inner holes of the precision-machined end plates at both ends. The pressure plate is pressed tightly against the inner holes of the end plates at both ends, and a support is provided at the bottom of the pressure plate to prevent deformation of the housing.

[0190] S503.2, Mill all parts of the upper housing cavity according to the drawing;

[0191] S503.3, Machining the upper housing groove according to the drawing;

[0192] Regarding the lower casing:

[0193] S503.4, using the inlet and outlet flange faces of the casing as the base surface, adjust the gaskets of the inlet and outlet flanges, press down the split surface of the casing to level it, align the inner holes of the end plates at both ends, and press the pressure plates to tighten the back of the inlet and outlet flanges:

[0194] S503.5, mill each part of the lower housing cavity according to the drawing;

[0195] Regarding the lower casing:

[0196] S503.6, using the inlet and outlet flange faces of the casing as the base surface, adjust the gaskets of the inlet and outlet flanges, press down the split surface of the casing to level it, align the inner holes of the end plates at both ends, and press the pressure plates to tighten the back of the inlet and outlet flanges:

[0197] S503.7, mill the inclined surface of the split surface of the machine housing; retain the dial indicator plane;

[0198] S503.8, Mill the positioning grooves on the split surface of the housing;

[0199] S503.9, Mill the planes of each support leg and the positioning keyway;

[0200] S503.10, Holes and recesses on the plane of the support leg;

[0201] S503.11, clean burrs and flash, remove oil and metal filings, blow and wipe dry the coolant, and apply rust-preventive oil.

[0202] S504, Drilling:

[0203] Regarding the lower casing:

[0204] S504.1, the inlet and outlet flange plane of the lower casing is the installation reference plane. Level it according to the split surface of the casing. Press the pressure plate to the back of the casing air outlet flange: drill holes on the plane of the support legs.

[0205] S505, Fitter work:

[0206] S505.1, Grind and polish all parts of the housing to remove burrs and flash, ensuring the appearance quality of the housing;

[0207] S505.2, Grind the lifting ring area to create a smooth transition;

[0208] S505.3, Clean all pores;

[0209] S505.4 Clean all parts inside and outside the casing, ensuring no metal filings or other debris remain;

[0210] S505.5, rust prevention treatment shall be carried out in accordance with the "General Process Code for Rust Prevention in Fan Manufacturing";

[0211] S505.6, the process can only proceed to the next step after passing the inspection.

[0212] S506 Inspection: Inspect all parts inside and outside the casing for any remaining metal filings or other debris.

[0213] S600, Second hydrostatic test: Using the left and right end covers and test fixtures, the casing cavity was precision machined according to the pressure test instructions and then subjected to hydrostatic test. The cavity test pressure was 1.1 times the design pressure.

[0214] S601, precision milling: dial gauges are used to mark the inner end faces of the split surfaces of the upper and lower housings and the pressure test sealing surfaces, and the dial gauge data is recorded.

[0215] S602, fitter's work: reassembling the upper and lower housings, direct sales of installation process, and connecting the bolts of the upper and lower housings.

[0216] S603, Drilling: Disassemble the process pins in sequence, and drill and ream the tapered pin holes on the split surface of the housing to meet the design drawing requirements.

[0217] Complete the casing machining.

[0218] The processing method provided by this invention differs significantly from traditional horizontally split compressor housings in both mechanical and sealing structures. The processing method for this integrally sealed horizontally split compressor housing involves: the outer plate of the integrally sealed horizontally split compressor housing is thinner than that of traditional horizontally split housings; the positioning platform for the internal partition plate is generated by removing material from the outer plate, effectively achieving a lightweight design for large housings; and the end plates of the integrally sealed horizontally split compressor housing feature large-diameter internal bore structures, allowing for a maximum machining positioning size of φ1600. The diameter of the compressor casing is close to the internal cavity size, increasing the internal space and improving compressor performance. This allows the compressor to better adapt to harsh operating conditions such as high pressure and low temperature, meeting actual usage requirements. The upper and lower horizontal split-type compressor casing is sealed by closely spaced bolts, and the horizontal split surface is sealed with a horizontal accuracy of 0.02mm and a roughness of Ra1.6. The casing of the integrated seal horizontal split-type compressor is matched with the end caps of the integrated sealing body at both ends by the dimensional accuracy of the end plate inner hole, and the axial sealing of the casing is achieved by the vertical accuracy of the inner end face of the end plate of 0.03mm and a roughness of Ra1.6. The coaxiality of the inner holes at both ends of the integrated seal horizontal split-type compressor casing can reach 0.02mm, ensuring stable operation of the unit. The machining accuracy of the new integral sealed horizontal split-type split compressor housing machining process is ensured from multiple aspects, including clamping alignment, machining quantity control, machining stress removal, prevention of clamping deformation, and the application of special accessories for large CNC equipment, so as to meet the technical requirements of actual production.

[0219] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0220] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A method for machining the casing of an integrally sealed horizontally split self-contained compressor, characterized in that, include: Rough machining of the housing: Draw the machining line of the center split surface, rough mill the center split surface of the upper and lower housings; draw the machining lines of the inner hole and inner end face of the housing, as well as the machining lines of each hole on the horizontal center split surface of the housing, machine the mating hole on the horizontal center split surface, and rough mill the inner hole, stop, and various parts of the housing cavity of the end plates at both ends of the housing. First, draw the machining lines for the split flange of the housing, and then draw the machining lines for the inlet and outlet flange planes of the housing. Next, rough mill the split surfaces of the upper and lower housings, and rough mill the inlet and outlet flange planes of the lower housing. Then, draw the machining lines for the inner holes and inner end faces of the housing, as well as the machining lines for each hole on the horizontal split surface of the housing. Next, machine the mating holes on the horizontal split surface of the housing, and rough mill the inner holes and stops of the end plates at both ends of the housing, as well as the positioning platform in the abdominal cavity of the housing and the positioning platform in the abdominal cavity of the lower housing. Finally, eliminate the machining stress and welding residual stress generated by rough machining; and sandblast to remove the oxide substances generated by stress relief. Semi-finishing of the housing: Semi-finish milling of the split surface of the upper and lower housings, semi-finish milling of the inner holes of the end plates, the inner end faces and stops for the end caps, semi-finish milling of all parts of the housing cavity, machining of the bolt holes for the end plates and end caps at both ends of the housing, and continuing to machine the horizontal split surface fitting holes; assembling the upper and lower housings together, boring the balancing air holes of the housing; assembling and welding of all parts of the housing cavity. Precision machining of the housing: precision mill the split surface of the upper and lower housings, assemble the upper and lower housings and install the bearing cover, precision bore the positioning inner holes of the side end plates and end covers, the inner end faces of the end plates and end covers, and the outer circle stop of the end covers, and continue to machine the end holes of the housing and end covers; precision mill all parts of the housing cavity, and then grind, clean and inspect all parts inside and outside the housing.

2. The method for machining the casing of an integrally sealed horizontally split self-contained compressor according to claim 1, characterized in that, The method for machining the casing of the integrally sealed horizontally split self-contained compressor also includes: First hydrostatic test: After the semi-finishing of the casing is completed, a hydrostatic test is performed on the casing cavity after semi-finishing. Second hydrostatic test: After the casing is finished, the left and right end covers are installed, the casing cavity is finished, and then a hydrostatic test is conducted.

3. The method for machining the casing of an integrally sealed horizontally split-type self-contained compressor according to claim 1, characterized in that: Semi-finishing of the casing: First, semi-finish mill the split surfaces of the upper and lower casings, then semi-finish mill the inner holes of the end plates, the inner end faces and stops that fit with the end caps, and the various parts of the casing cavity. Then, semi-finish mill the flange planes of each air outlet and the stops of each air duct flange on the lower casing. Threads are machined into the fitting holes on the horizontal split surface of the casing. The bolt holes for fitting the end plates and end caps at both ends of the casing are machined. Next, the machining lines for the holes on the flange planes of the air inlet and outlet of the casing are drawn, as are the machining lines for the through holes in the cavities of the upper and lower casings. The through holes in the casing cavity are then machined. Finally, the various connecting pipes, elbows, and their corresponding end flanges that connect with the casing cavity are assembled and welded. The welds are then inspected by radiographic testing and ground. Precision machining of the casing: First, precision mill the center split surface of the upper casing, then precision mill the inlet and outlet flange planes of the lower casing, and finally precision mill the center split surface and flange plane of the lower casing. Then, assemble the upper and lower casings, precision bore the positioning inner holes of the side end plates and end caps, the inner end faces of the end plates and end caps, and the outer circle stop of the end caps, and machine the end cap mating holes at both ends of the casing. Next, precision mill all parts of the upper casing cavity and all parts of the lower casing cavity. Finally, grind, clean, and inspect all parts inside and outside the casing.

4. The method for machining the casing of an integrally sealed horizontally split-type self-contained compressor according to claim 3, characterized in that, The rough machining of the housing also includes: Before marking the machining line of the split surface, use the machine tool work platform, with the split surface as the mounting base for the upper and lower machine housings respectively, and use jacks to support the workpiece. Adjust the jacks and use the back of the flange of the split surface of the machine housing as the reference to level it. Then mark the machining line of the flange of the split surface of the machine housing, and mark the machining lines of the flange plane of the air inlet and outlet of the machine housing. When rough milling the split surface of the upper housing, the split surface of the upper housing should be facing upwards. The square box supports the back of the flange of the split surface of the upper housing. Wedges are placed at the four corners of the housing. The wedges are adjusted to level the housing according to the split surface line. The pressure plate is pressed against the inner hole of the end plate at both ends of the upper housing. The bottom of the pressure plate is supported. Then, the split surface of the upper housing is rough milled, leaving a margin. The surface roughness is Ra6.

3. When rough milling the center section of the lower casing, the center section of the lower casing is used as the installation reference surface. Wedges are placed at the four corners of the lower casing. The wedges are adjusted and the center section line of the lower casing is pressed down to level it. The pressure plate is pressed against the back of the flange of the center section of the lower casing. Then, the inlet and outlet flange planes of the lower casing are rough milled, leaving a margin, and the surface roughness reaches Ra6.

3. Then, the casing is hoisted and flipped over, with the air duct flange surface as the installation reference surface. The pressure plate is pressed against the back of the air duct flange, and the center section of the lower casing is rough milled, leaving a margin of 5mm, with a surface roughness of Ra6.

3.

5. The method for machining the casing of an integrally sealed horizontally split-type self-contained compressor according to claim 3, characterized in that, The machining lines for the inner bore and inner end face of the housing, as well as the machining lines for each hole on the horizontal split surface of the housing, include: Considering the machining allowance of each part of the upper housing, draw axial and radial alignment lines on the inner hole and end face of the upper housing; considering the machining allowance of each part of the lower housing, draw axial and radial alignment lines on the inner hole and split surface of the lower housing.

6. The method for machining the casing of an integrally sealed horizontally split-type self-contained compressor according to claim 5, characterized in that, The rough milling machine housing includes the inner holes and stops of the end plates at both ends, the various parts of the machine housing cavity positioning platform, and the various parts of the lower machine housing cavity positioning platform, including: When rough milling the upper housing, the split surface of the upper housing should face upwards. The square box supports the back of the flange on the split surface of the upper housing. Wedges should be placed at the four corners of the upper housing. Adjust the wedges and level the upper housing according to the split surface line. Draw axial and radial lines according to the positions of the inner holes and end faces at both ends of the upper housing to align it. Press the pressure plate to the lowest point of the inner hole of the end plate at both ends of the upper housing. Provide support at the bottom of the pressure plate position. Considering the allowance of the split surface, rough machine the horizontal split surface of the upper housing to make the mating hole. Rough mill the inner holes of the end plates at both ends of the upper housing and the stop of the inner end face of the end plate, leaving allowance on one side. Rough mill all parts of the positioning platform in the abdominal cavity of the upper housing, leaving allowance on one side. When rough milling the lower housing, with the center split surface of the lower housing facing upwards, press down on the center split surface line to level it, and then press down on the inner hole and end face positions of the housing to draw axial and radial lines for alignment; press the pressure plate to the back of the inlet and outlet flanges, support legs, and the back of the center split surface: Roughly machine the bottom hole of the horizontal split surface of the lower housing and tap the thread; rough mill the inner holes of the end plates at both ends of the lower housing and the stop of the inner end face of the end plates, leaving a margin; rough mill all parts of the positioning platform in the abdominal cavity of the lower housing, leaving a margin on one side.

7. The method for machining the casing of an integrally sealed horizontally split-type self-contained compressor according to claim 3, characterized in that, The aforementioned semi-finishing of the housing also includes: When semi-finish milling the upper housing, the split surface of the upper housing should face upwards. The square box supports the back of the flange on the split surface of the upper housing. Shims should be used to adjust the four corners of the back of the flange on the split surface of the upper housing. The upper housing should be leveled according to the machined split surface. The pressure plate should be pressed tightly to the lowest point of the inner hole of the end plates at both ends. The bottom of the pressure plate should provide support. Semi-finish mill the center split surface of the upper housing, leaving machining allowance; loosen the pressure plate and check the flatness of the center split surface with a dial indicator, ensuring it meets the design drawing requirements and the surface roughness reaches Ra3.2; level the center split surface of the housing and align the inner holes of the end plates at both ends; press the pressure plate tightly against the center split surface of the housing, with support at the bottom of the pressure plate to prevent deformation of the housing during mounting; considering the allowance for the center split surface, enlarge the bolt holes on the horizontal center split surface of the upper housing, leaving reaming allowance; ream the bolt holes on the horizontal center split surface; considering the allowance for the center split surface and all other parts, semi-finish mill the end plates. The inner hole, the inner end face of the end cap, and the stop are all left with a single-sided allowance; the surface roughness of the test pressure surface reaches Ra3.2; considering the center parting surface and the allowance of each part, semi-finish mill each part of the upper housing cavity, leaving an allowance; considering the allowance of the upper and lower center parting surfaces, adjust the machine tool to the center line of the ideal state of the housing design, and mark the bolt holes of the end plates and end caps at both ends of the housing; drill the bolt holes of the end plates and end caps at both ends of the housing, machining one grade smaller; loosen the pressure plate and check the form and position tolerances of the upper housing center parting surface and sealing surface; When semi-finish milling the lower housing, use the center section of the lower housing as the installation reference surface. Place wedges at the four corners of the center section of the lower housing, adjust the wedges, and level it according to the machined center section of the lower housing. Press the pressure plate firmly against the back of the flange of the center section of the lower housing. Semi-finish mill the flange planes of each air outlet on the casing, leaving allowance on each side; loosen the pressure plate, check the flange planes with a dial indicator, and ensure they meet the design drawing requirements with a surface roughness of Ra3.2; considering the flange plane allowance, mill the flange stops of each air duct. Hoist and flip the casing, using the inlet and outlet flange planes of the lower casing as the installation base surface. Level the lower casing according to the machined center split surface, press the back of the inlet and outlet flanges with the pressure plate, and support the back of the center split surface. Semi-finish mill the center split surface of the lower housing, leaving a 1mm machining allowance; loosen the pressure plate, use a dial indicator to check the flatness of the center split flange, check the flatness of the center split surface to meet the design drawing requirements, and the roughness to Ra3.2; adjust the inlet and outlet flanges with shims, level the center split surface of the lower housing, align it according to the inner holes of the end plates at both ends, press the pressure plate to the back of the inlet and outlet flanges, and support the back of the center split surface; considering the allowance of the lower housing center split surface, enlarge the bottom hole of the screw hole of the lower housing center split surface, and mill the horizontal center of the lower housing. The split-face screw hole is threaded; considering the split face and the allowance of each part, the inner holes of the end plates at both ends and the inner end face stop of the end plates are semi-finish milled, with allowance on one side; the surface roughness of the test press reaches Ra3.2; considering the split face and the allowance of each part, the lower housing cavity is semi-finish milled according to the drawing, with allowance; considering the split face allowance, the machine tool is adjusted to the center line of the ideal state of the housing design, and the bolt holes of the end plates and end covers at both ends of the housing are marked; the bolt holes of the end plates and end covers at both ends of the housing are drilled one gear smaller.

8. The method for machining the casing of an integrally sealed horizontally split-type self-contained compressor according to claim 7, characterized in that, The process of marking the holes on the inlet and outlet flange planes of the housing includes: Drill the casing, using the middle section of the casing as the mounting base. Press the pressure plate against the back of the middle section of the casing, taking into account the machining allowance of each part of the flange: rough drill each hole on the inlet and outlet flange; enlarge each hole on the inlet and outlet flange, leaving a reaming allowance; drill and ream each hole on the inlet and outlet flange. Mill the casing, using the inlet and outlet flange surfaces of the casing as the base surface, adjust the inlet and outlet flange gaskets, press down the center split surface of the casing to level it, and align the inner holes of the two end plates; press the pressure plate tightly against the back of the inlet and outlet flanges to support the back of the center split surface: Check the form and position tolerances of the inner end face of the split surface and the test pressure sealing surface of the housing; mill the inclined surface of the split surface of the housing; drill the drain hole and recess of the housing. Mill the upper housing, using the middle surface of the upper housing as the installation reference surface. Place wedges at the four corners of the middle surface of the housing, adjust the wedges, and level the housing according to the machined middle surface. Press the pressure plate to tighten the back of the flange of the middle surface of the housing. Considering the middle surface and the allowance of each part, bore the through holes in the cavities of the upper and lower housings. Assemble and weld all pipes, elbows and their corresponding end flanges in the casing cavity; perform radiographic inspection on the welds; shape; grind the welds.

9. A method for machining the casing of an integrally sealed horizontally split-type self-contained compressor according to claim 3, characterized in that, The aforementioned housing finishing also includes: Test gauges were applied to the split surface of the upper and lower housings and the inner end face of the test pressure sealing surface, respectively. Mill the upper housing, with the split surface of the upper housing facing upwards. Support the back of the flange on the split surface of the upper housing with a square box. Adjust the four corners of the flange on the back of the split surface of the housing with shims. Level the housing according to the split surface. Press the pressure plate to the inner hole position of the end plates at both ends. Provide support at the bottom of the pressure plate position. Precision mill the split surface of the upper housing to meet the design requirements. Loosen the pressure plate and check the flatness of the split surface to meet the design drawing requirements. Mill the lower housing, using the center section of the lower housing as the installation reference surface. Place wedges at the four corners of the center section of the housing, adjust the wedges, and level the housing according to the center section. Press the pressure plate firmly against the back of the flange on the center section of the housing. Mill the inlet and outlet flange planes of the lower housing, loosen the pressure plate, and check the flatness of the inlet and outlet flanges to meet the design drawing requirements; turn the housing so that the inlet and outlet flanges are the installation reference surfaces, and press the pressure plate to the back of the inlet and outlet flanges; mill the middle parting surface and flange plane of the lower housing, and check the flatness of the middle parting surface to meet the design drawing requirements; Align the lower housing with the center split surface and the inner holes at both ends; mill the alignment plane on the flange side of the center split surface of the lower housing to a roughness of Ra3.2; assemble the upper and lower housings and install the locating pins; use a rotary table and cutter head to precision bore the locating inner hole of one end plate and end cover, the inner end face that engages with the end cover, and the outer circle stop of the end cover; rotate the worktable 180° and use a rotary table and cutter head to precision bore the locating inner hole of the other end plate and end cover, the inner end face that engages with the end cover, and the outer circle stop of the end cover; ream and ream the bolt holes at both ends of the housing that engage with the end cover; drill the bottom holes of each set screw hole on both ends of the housing and tap the threads.

10. A method for machining the casing of an integrally sealed horizontally split-type self-contained compressor according to claim 9, characterized in that, The precision milling of each part of the upper housing cavity and the precision milling of each part of the lower housing cavity also include: Mill the upper housing, with the split surface of the upper housing facing upwards. Support the back of the flange on the split surface of the upper housing using a square box. Adjust the four corners of the flange on the back of the split surface by placing shims. Level the housing according to the split surface and align it with the inner holes of the precision-machined end plates at both ends. Press the pressure plate firmly against the inner holes of the end plates at both ends. Provide support at the bottom of the pressure plate to prevent deformation of the housing. Precision milling of all parts of the upper housing cavity; Mill off the casing. Using the inlet and outlet flange surfaces of the casing as the base surface, adjust the gaskets on the inlet and outlet flanges. Press down on the split surface of the casing to level it. Align it according to the inner holes of the end plates at both ends. Press the pressure plate firmly against the back of the inlet and outlet flanges. Precision milling of all parts of the lower housing cavity; milling of the inclined surface of the lower housing split surface; Then, grind, clean, and inspect all parts inside and outside the casing.

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