CN111250942A - Processing method of split crankcase of large six-row three-stage labyrinth compressor - Google Patents
Processing method of split crankcase of large six-row three-stage labyrinth compressor Download PDFInfo
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- CN111250942A CN111250942A CN202010170737.3A CN202010170737A CN111250942A CN 111250942 A CN111250942 A CN 111250942A CN 202010170737 A CN202010170737 A CN 202010170737A CN 111250942 A CN111250942 A CN 111250942A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/14—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass gear parts, e.g. gear wheels
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Abstract
The invention relates to the field of a processing method of a labyrinth compressor, in particular to a processing method of a split-type crankcase of a large-scale six-row three-level labyrinth compressor, which reasonably utilizes the existing equipment and a special processing tool, can ensure that the roughness of a slideway hole, the coaxiality of the slideway hole and a corresponding guide bearing positioning hole and the tolerance of the hole center distance of each row of slideway holes meet the design requirements, ensure that a bearing hole central shaft is vertical to the slideway hole central shaft, and on one plane, comprises three steps of processing a crankcase body, processing a crankcase chassis and combining processing, respectively process the crankcase body and the crankcase chassis, ensure respective processing precision, combine, finally ensure that the roughness of the slideway hole, the coaxiality of the slideway hole and the corresponding guide bearing positioning hole and the tolerance of the hole center distance of each row of the slideway hole meet the design requirements, ensure that the bearing hole central shaft is vertical to the slideway hole central shaft, and in one plane.
Description
Technical Field
The invention relates to the field of a processing method of a labyrinth compressor, in particular to a processing method of a split type crankcase of a large six-row three-stage labyrinth compressor.
Background
The existing labyrinth compressor crankcase is basically of an integral structure and comprises guide bearing positioning holes, sliding channel holes, bearing holes, bottom oil pools and the like, the number of rows is two, three and four rows of crankcase bodies, and belongs to small and medium-sized parts; then, the middle bearing hole is machined by the through-center row, the coaxiality of all the bearing holes is guaranteed, and a guide bearing positioning hole and a slide way hole are bored by a horizontal boring main shaft.
A split crankcase of a large six-row labyrinth compressor is a new structure in the field of labyrinth compressors. The overall dimension of the whole crankcase is larger, in order to reduce the processing difficulty, a split structure is adopted, as shown in a figure 1 and a figure 2, the crankcase is divided into an upper split body and a lower split body from a bearing hole 5, the overall dimension of the crankcase body 1 at the upper part is far beyond that of the crankcase body of a common labyrinth compressor, the crankcase body is of a vertical overall structure and is a large-scale integral casting made of nodular cast iron. The processing difficulty of the crankcase is as follows: the roughness requirement of six chute holes 4, the coaxiality requirement of the chute holes 4 and corresponding guide bearing positioning holes 3, the tolerance requirement of the distance between centers of holes between the six chute holes 4 and the requirement of the upper part and the lower part after the upper part and the lower part are closed, the central axis of a bearing hole 5 is perpendicular to the central axis of the chute holes 4, and on one plane, the current processing mode can not meet the processing precision.
Disclosure of Invention
Aiming at the problems, the invention provides a processing method of a split crankcase of a large six-row three-stage labyrinth compressor, which reasonably utilizes the existing equipment and special processing tools, can ensure that the roughness of a slideway hole, the coaxiality of the slideway hole and a corresponding guide bearing positioning hole and the tolerance of the hole center distance of each row of slideway holes meet the design requirements, and ensure that the central axis of the bearing hole is vertical to the central axis of the slideway hole and is on the same plane.
The technical scheme is as follows: the processing method of the split type crankcase of the large six-row three-stage labyrinth compressor is characterized by comprising three steps of crankcase body processing, crankcase chassis processing and combined processing, wherein the crankcase body processing step comprises the following steps:
(1) drawing an outline processing line of the blank; roughly machining each part of the bottom surface; roughly boring six slide way holes; adjusting the surface, and roughly processing each part of the top surface; roughly boring six guide bearing positioning holes;
(2) stress removal, shot blasting treatment and primer coating on the non-processing surface;
(3) marking processing lines on all surfaces; semi-finishing the bottom surface, the side surface and each surface at two ends, and drilling each through hole and thread at the bottom; surface adjustment, semi-finish machining of each surface, side surface and two end surfaces of the top, and drilling of through holes and threads on four side surfaces;
(4) carrying out hydrostatic test;
(5) finish machining the bottom surface and the side surface, semi-finish machining two end surfaces, and drilling connecting holes and threads at the bottom; adjusting surfaces, finely machining the top surface and the side surface, semi-finely machining two end surfaces, drilling connecting holes and threads on the top, semi-finely boring and finely boring six slideway holes and corresponding guide bearing holes;
the crankcase chassis processing steps comprise:
(1) marking the appearance processing line of the blank, wherein the bottom surface faces upwards, and roughly processing a bottom plane, convex table surfaces of two side foot plates and two end planes; surface adjustment, namely roughly machining a top surface, a half surface and an inner step of a bearing hole, and upper boss end surfaces and bearing holes at the left end and the right end;
(2) removing burrs and performing a kerosene leakage test after cleaning; stress removal, shot blasting treatment and primer coating on the non-processing surface;
(3) marking processing lines on all surfaces, enabling the bottom surface to face upwards, and performing semi-finish and finish machining on the bottom surface and the side surface; drilling through holes and threads at the bottom; after surface adjustment, semi-finish machining the top surface, and semi-finish milling the upper boss end surfaces of the left end and the right end to leave allowance; roughly and finely milling two side surfaces of a bearing hole; roughly and semi-finely milling a half surface of a bearing hole and a step in the half surface; drilling connecting bolt holes at the top and drilling and hinging positioning pin holes; finely milling a half surface of a bearing hole and a step in the half surface; milling a top surface sealing ring groove; leading each bearing cap and each accessory, and assembling by using a hydraulic stretcher according to specified pressure; drilling, expanding and reaming the taper pin hole and inserting the taper pin; semi-finishing and finish-machining the bearing hole; finish machining the top surface;
the combined processing comprises the following steps:
and (3) folding and combining the crankcase body and the crankcase chassis, finely machining two end faces to be flush, and enabling inner holes of the end covers at the two ends and an inner hole of the shaft seal end cover to be coaxial with the bearing hole.
The machining method is further characterized in that the special tapered reamer is used for machining positioning tapered pin holes of the bearing cover and the chassis;
the processing method uses special equal-height pads to clamp the crankcase chassis.
After the invention is adopted, the crankcase body and the crankcase chassis are respectively processed, the respective processing precision is ensured, and then the combination is carried out, finally the roughness of the slideway hole, the coaxiality of the slideway hole and the corresponding guide bearing positioning hole and the tolerance of the hole center distance of each row of slideway holes are ensured to meet the design requirement, and the central axis of the bearing hole is ensured to be vertical to the central axis of the slideway hole and is on the same plane.
Drawings
FIG. 1 is a schematic external view of a split crankcase of a six-row labyrinth compressor;
FIG. 2 is a left side view of FIG. 1;
FIG. 3 is a schematic view of an equal height pad for clamping a crankcase chassis;
FIG. 4 is a top view of FIG. 3;
FIG. 5 is a schematic view of a crankcase chassis clamp;
fig. 6 is a schematic view of a special cone reamer.
Detailed Description
The external dimension of the crankcase body is as follows: 4620 +/-0.10 multiplied by 1620 multiplied by 2280 +/-0.10 (length, width and height) as an example, the roughness Ra1.6 of the slideway hole, the coaxiality phi of the slideway hole and the positioning hole of the guide bearing is 0.025, the center distance of the six slideway holes is 820 +/-0.02 and 650 +/-0.02, the verticality between the slideway hole and the bottom surface is 0.05, and the verticality between the side surface and the bottom surface is 0.06 (unit: mm).
Referring to fig. 3 to 6, the method for processing the split crankcase of the large six-row three-stage labyrinth compressor is characterized by comprising three steps of crankcase body processing, crankcase chassis processing and combined processing, wherein the crankcase body processing step comprises the following steps:
(1) drawing an outline processing line of the blank, and checking the processing allowance of each part;
(2) roughly machining each part of the bottom surface:
roughly machining each surface of the bottom and each boss, and reserving 2 allowance for each side surface of the boss of the foot plate on two sides;
roughly milling a bottom plane, roughly milling upper planes of foot plates on two sides, and roughly milling a lower boss plane on two sides and a lower boss plane on the left end and the right end to leave 4 margins;
6 allowance is left for 6 times of coarse boring of the slideway hole of 6x phi 460.
(3) Roughly machining each part of the top surface:
roughly processing each surface and each boss on the top;
roughly milling the top surface, the upper boss planes at the two sides, and the upper boss planes in the middle and at the left and right ends to be flush with the milled planes;
roughly boring a guide bearing positioning hole of 6 multiplied by phi 462 and an end surface of 6 multiplied by phi 600;
(4) stress removal, shot blasting treatment and primer coating on the non-processing surface;
(5) marking processing lines on all surfaces;
(6) semi-finishing each part of the bottom surface:
finish milling the side surfaces of the foot plates at two sides, Ra3.2; (for art correction)
Milling upper planes of the foot plates on the two sides;
semi-finish milling the lower boss planes of the left end and the right end, and respectively reserving 1 allowance;
semi-finish milling and finish milling the boss planes at the lower parts of the two sides;
drilling and tapping threaded holes on four side surfaces after dotting;
(7) semi-finishing each part of the top surface and the threaded hole:
semi-finish milling the top surface and the middle and upper boss planes at the left and right ends, and respectively reserving 0.5 allowance;
roughly and finely milling the upper boss planes on the two sides;
drilling and tapping threaded holes at two ends and two sides after dotting;
(8) water chamber hydrostatic test: the pressure is 0.8MPa for 30 minutes;
(9) finish machining each part of the bottom surface:
the margin of 0.3 is left on the half-milled bottom surface;
drilling holes at the bottom and drilling and tapping threaded holes;
drilling and reaming 2x phi 30H 7;
roughly and finely milling the lower end face of a 4x phi 460H6 slideway hole;
loosening the pressing plate, and finely milling a bottom surface facing diagram;
(10) semi-finish milling and finish milling the upper part of the left end surface and the right end surface;
reserving 0.3 allowance on the semi-finish-milled top surface;
milling a top surface two sealing ring groove pair diagram;
after dotting, drilling holes on the top surface and drilling and tapping threads on the top surface;
roughly and finely milling upper end surface maps of six guide bearing positioning holes;
semi-finish boring and finish boring 6x phi 460H6 slideway holes and 6x phi 462H6 guide bearing positioning holes.
And loosening the pressing plate and finish-milling the top surface to the drawing.
(the hole center distance of the six phi 460H6 slide holes is 820 +/-0.02 and 650 +/-0.02, the hole center distance tolerance is ensured by a five-surface machining center, and the influence of the positioning precision of the machine tool can be reduced by dividing two holes in the middle to two sides.
The total depth of the slide way hole and the guide bearing positioning hole reaches 1365, the length of the whole slide way hole is 770, and in order to ensure that the coaxiality of the slide way hole and the guide bearing positioning hole is phi 0.025, the guide bearing positioning hole phi 462H6 is bored firstly, then the guide bearing positioning hole is aligned by a dial indicator, the jump is within 0.01, and the slide way hole phi 460H6 is bored in a tool changing manner, so that the coaxiality of the guide bearing positioning hole phi 462H6 and the slide way hole phi 460H6 is ensured; in order to ensure that the roughness of the slideway hole is within 1.6, a CBN boring blade is selected, when semi-fine boring is carried out, the slideway hole is reserved with 0.10 allowance, when fine machining is carried out, a first cutter is firstly bored, the allowance is reserved with 0.03-0.04, then the last cutter is bored, and the cutting parameter is determined to be S120F 12.
The final determination of the cutting parameters is that the linear speed and the abrasion loss are considered, the abrasion of the blade is aggravated when the rotating speed is too high, the aperture size is influenced, the feeding is too fast, the roughness cannot be achieved, and the blade cannot be replaced between two fine boring cutters. )
(11) The crank case chassis is combined and processed;
(12) deburring, cleaning, applying anti-rust oil and stamping steel marks.
The crankcase chassis processing steps are as follows:
(1) drawing an outline processing line of the blank;
(2) roughly machining each part of the bottom surface:
roughly milling the side surfaces of the foot plates on the two sides, and reserving 1 allowance respectively; roughly milling the bottom surface of the foot plate, and reserving 3 allowance;
(3) roughly machining each part of the top surface:
roughly milling a top surface, a half surface of a bearing hole, an inner step 500H7, and upper and lower boss planes at the left and right ends, and respectively reserving 3 allowance; roughly boring a bearing hole;
(4) removing burrs and impurities in the cavity, and performing a kerosene leakage test;
(5) stress removal, shot blasting treatment and primer coating on the non-processing surface;
(6) marking processing lines on all surfaces;
(7) a worktable is arranged on the top surface, and two side-to-side images are finely milled; semi-finish milling and finish milling two 140-wide foot planes.
(8) A worktable is arranged on the bottom surface, and the top surface, the left end and the right end of the top surface, the upper part and the lower part of the boss plane are semi-finish milled to leave allowance;
roughly and finely milling a half facing diagram and a bearing retainer of a bearing hole;
after dotting, drilling and tapping each threaded hole on the top surface;
drilling and reaming 2x phi 30H 7;
after dotting, drilling and tapping each threaded hole at the oil pump end;
milling a top surface sealing ring groove and a 6x phi 35 pair of drawings;
milling a notch alignment diagram in the bearing hole at the position 7;
assembling seven collar bearing covers, fourteen bearing seat bolts and fourteen round nuts with the chassis (using a hydraulic stretcher to pre-tighten the force of 52-59 MPa);
matching drill, expanding and hinging bearing cover and chassis 14x phi 20, 1: 50 taper pin holes are aligned, and a positioning pin is inserted;
(because the position of the taper pin hole is interfered with a hydraulic nut, and the depth dimension of the step in the taper pin hole on the bearing cap can not be processed by using a common standard taper reamer, a special taper reamer is designed, the material of the cutter bar is hard alloy, six blades are adopted, and the material of the cutter body is 45 steel.)
Roughly and finely machining a 7x phi 296H6 bearing hole;
disassembling the bearing cap (firstly, a hydraulic nut is taken down by a hydraulic stretcher, then, a positioning pin is taken out by a special tool), and marking corresponding steel seal marks on the bearing cap and the matched stud before disassembly;
milling a thrust ring groove;
roughly and finely boring semi-circle inner steps at two sides of a bearing hole at the end of the motor;
finish milling the lower boss plane surface maps of the left and right ends;
finish milling a top surface map;
drilling a 7x phi 20 oil hole alignment chart in a bearing hole;
(9) removing sharp edge burrs and cleaning;
getting according to a part drawing: the crankshaft box body, the stage stud, the nut and the 2x phi 30m6 pin are assembled, two end faces are leveled in finish machining, and connecting threads at two ends are drilled and tapped.
(when the upper part and the lower part are folded, a process pin is used for coarse positioning firstly, and is pulled out after positioning, and then a product pin is used for positioning) in order to realize smooth folding
(10) After the combination processing is finished, matching marks are marked on the motor end cover, the oil pump end cover, the shaft seal end cover, the crankcase body and the crankcase chassis;
the end covers and the pads at the two ends are disassembled, the bearing cover and the crankcase chassis are disassembled, and all parts and fasteners of the bearing cover are disassembled to be well kept respectively.
(11) Deburring, milling, applying anti-rust oil and stamping a steel seal.
The combined processing steps are as follows:
(1) aligning again and determining the centers of bearing holes at two ends of the chassis of the crankcase, and setting a coordinate system; the finish milling box body is flush with the boss planes at the half surfaces at the left end and the right end of the chassis, and the total length is 4620 +/-0.10;
(2) firstly, drilling center holes of each hole on the planes of bosses at two ends, and then drilling and tapping each screw hole;
(3) getting according to a part drawing: the method comprises the steps of firstly, arranging a first oil pump end cover, a first motor end cover, a second end cover pad, a first shaft seal end cover, bolts, a fourth 25m6x30 positioning pin and a second 12m6x30 positioning pin, arranging the first oil pump end cover, the second oil pump end cover, the third shaft seal end cover, the fourth shaft seal end cover, the fifth shaft seal end cover, the sixth shaft seal end cover and the bolts according to the part diagram, aligning a finished bearing hole.
The method comprises the steps of fixing the motor end cover on a crankcase by bolts, basically aligning an inner hole of the end cover to be coaxial with a bearing hole, boring the inner hole of the end cover to the size by using a boring cutter, drilling and reaming the hole, inserting a positioning pin, and processing the inner hole of the shaft seal end cover in the same way.
Claims (3)
1. The processing method of the split type crankcase of the large six-row three-stage labyrinth compressor is characterized by comprising three steps of crankcase body processing, crankcase chassis processing and combined processing, wherein the crankcase body processing step comprises the following steps:
(1) drawing an outline processing line of the blank; roughly machining each part of the bottom surface; roughly boring six slide way holes; adjusting the surface, and roughly processing each part of the top surface; roughly boring six guide bearing positioning holes;
(2) stress removal, shot blasting treatment and primer coating on the non-processing surface;
(3) marking processing lines on all surfaces; semi-finishing the bottom surface, the side surface and each surface at two ends, and drilling each through hole and thread at the bottom; surface adjustment, semi-finish machining of each surface, side surface and two end surfaces of the top, and drilling of through holes and threads on four side surfaces;
(4) carrying out hydrostatic test;
(5) finish machining the bottom surface and the side surface, semi-finish machining two end surfaces, and drilling connecting holes and threads at the bottom; adjusting surfaces, finely machining the top surface and the side surface, semi-finely machining two end surfaces, drilling connecting holes and threads on the top, semi-finely boring and finely boring six slideway holes and corresponding guide bearing holes;
the crankcase chassis processing steps comprise:
(1) marking the appearance processing line of the blank, wherein the bottom surface faces upwards, and roughly processing a bottom plane, convex table surfaces of two side foot plates and two end planes; surface adjustment, namely roughly machining a top surface, a half surface and an inner step of a bearing hole, and upper boss end surfaces and bearing holes at the left end and the right end;
(2) removing burrs and performing a kerosene leakage test after cleaning; stress removal, shot blasting treatment and primer coating on the non-processing surface;
(3) marking processing lines on all surfaces, enabling the bottom surface to face upwards, and performing semi-finish and finish machining on the bottom surface and the side surface; drilling through holes and threads at the bottom; after surface adjustment, semi-finish machining the top surface, and semi-finish milling the upper boss end surfaces of the left end and the right end to leave allowance; roughly and finely milling two side surfaces of a bearing hole; roughly and semi-finely milling a half surface of a bearing hole and a step in the half surface; drilling connecting bolt holes at the top and drilling and hinging positioning pin holes; finely milling a half surface of a bearing hole and a step in the half surface; milling a top surface sealing ring groove; leading each bearing cap and each accessory, and assembling by using a hydraulic stretcher according to specified pressure; drilling, expanding and reaming the taper pin hole and inserting the taper pin; semi-finishing and finish-machining the bearing hole; finish machining the top surface;
the combined processing comprises the following steps:
and (3) folding and combining the crankcase body and the crankcase chassis, finely machining two end faces to be flush, and enabling inner holes of the end covers at the two ends and an inner hole of the shaft seal end cover to be coaxial with the bearing hole.
2. The machining method of the split crankcase of the large-scale six-row three-stage labyrinth compressor according to claim 1, characterized in that a special tapered reamer is used for machining locating tapered pin holes of the bearing cover and the chassis.
3. The processing method of the large six-row three-stage labyrinth compressor split crankcase, as claimed in claim 1, is characterized in that the crankcase chassis is clamped by using special equal-height pads.
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| CN202010170737.3A CN111250942A (en) | 2020-03-12 | 2020-03-12 | Processing method of split crankcase of large six-row three-stage labyrinth compressor |
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| CN202010170737.3A CN111250942A (en) | 2020-03-12 | 2020-03-12 | Processing method of split crankcase of large six-row three-stage labyrinth compressor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112832920A (en) * | 2020-12-31 | 2021-05-25 | 浙江春风动力股份有限公司 | Engine crankcase and manufacturing method thereof |
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| US20070048151A1 (en) * | 2005-08-30 | 2007-03-01 | Sanyo Electric Co., Ltd. | Closed electric compressor |
| CN101362279A (en) * | 2008-09-05 | 2009-02-11 | 江西江铃底盘股份有限公司 | Processing technique of split type speed differentiator shell |
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| CN112832920A (en) * | 2020-12-31 | 2021-05-25 | 浙江春风动力股份有限公司 | Engine crankcase and manufacturing method thereof |
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Address after: 214145 No. 199, xixie Road, Hongshan street, Xinwu District, Wuxi City, Jiangsu Province Applicant after: Shengang Wuxi Compressor Co.,Ltd. Address before: 214145 Hong Shan Photoelectric Industrial Park, Xin Wu District, Wuxi, Jiangsu (No. 199, tin Xie Road) Applicant before: WUXI COMPRESSOR Co.,Ltd. |
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Application publication date: 20200609 |