CN109648260B - Method for processing bearing seat shell with small hole and large cavity - Google Patents
Method for processing bearing seat shell with small hole and large cavity Download PDFInfo
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- CN109648260B CN109648260B CN201811503395.1A CN201811503395A CN109648260B CN 109648260 B CN109648260 B CN 109648260B CN 201811503395 A CN201811503395 A CN 201811503395A CN 109648260 B CN109648260 B CN 109648260B
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Sliding-Contact Bearings (AREA)
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Abstract
A processing method of a bearing seat shell with a small hole and a large cavity relates to the processing technology of bearing seat shells. The original method for processing the bearing seat shell with the small hole and the large cavity has multiple steps, and the processed product has unqualified quality. The processing steps of the bearing seat shell are as follows: the method comprises the following steps: roughly machining a blank into a cylindrical workpiece, dividing the cylindrical workpiece into two identical semi-annular workpieces, finely machining the split surfaces of the semi-annular workpieces, combining the two semi-annular workpieces and drilling; step two: finely grinding the excircle and the end face of the semi-annular workpiece; step three: combining two semi-annular workpieces by bench work; step four: turning a plurality of inner holes in a bearing seat shell, end faces of the left end and the right end of the bearing seat shell and an excircle of the bearing seat shell; step five: opening the two semi-annular bearing seat shells by a bench worker; step six: processing holes for assembling two semi-annular bearing seat shells; step seven: and (7) oil sealing. The processing method is used for processing the bearing seat shell.
Description
Technical Field
The invention relates to a processing technology of a bearing seat shell, in particular to a processing method of a bearing seat shell with a small hole and a large cavity.
Background
The bearing seat shell product is structurally characterized in that the hole is small, the cavity is large, the requirements on form and position tolerance and dimensional tolerance are strict, and the bearing seat shell is formed by assembling an upper bearing seat shell and a lower bearing seat shell; the original processing method of the bearing seat shell with the small hole and the large cavity has multiple steps, and the phenomena that the processed product generates wrong teeth after being assembled and the sizes of the cavities of the upper bearing seat shell and the lower bearing seat shell are not consistent exist, so that the form and position tolerance and the size tolerance are out of tolerance, and the quality of the product is seriously influenced.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the original method for processing the bearing seat shell with the small orifice and the large cavity has more steps, and the processed product has unqualified quality; further provides a processing method of the bearing seat shell with small hole openings and large cavity.
The technical scheme adopted by the invention for solving the technical problems is as follows: the bearing seat shell is formed by splicing two identical semi-annular bearing seat shells 1;
a group of holes are respectively formed in the front end and the rear end of each semi-annular bearing seat shell 1, and the median planes of the two semi-annular bearing seat shells 1 are aligned and fixedly connected through bolts;
the outer surface of the bearing seat shell is provided with a circle of bulges to form an annular bulge 11, the annular bulge 11 is close to the right end of the bearing seat shell, and the axis of the annular bulge 11 is superposed with the axis of the bearing seat shell; the diameter of the first outer circle 12 of the bearing housing on the left side of the annular projection 11 is greater than the diameter of the second outer circle 13 of the bearing housing on the right side of the annular projection 11;
the calibers of the cylinder openings at the left end and the right end of the bearing seat shell are smaller than the diameter of the cavity of the inner cavity of the bearing seat shell; a plurality of parallel inner holes are respectively formed in the inner cavity of the bearing seat shell and at the cylinder openings at the left end and the right end of the bearing seat shell, and the axes of the inner holes are superposed with the axis of the bearing seat shell;
the inner holes in the inner cavity of the bearing seat shell comprise a ninth inner hole 20, two first inner holes 3, two second inner holes 4, two third inner holes 5 and two eighth inner holes 10, wherein one second inner hole 4, one first inner hole 3, one third inner hole 5 and one eighth inner hole 10 are sequentially processed in the inner cavity of the left side of the bearing seat shell from left to right, the other second inner hole 4, the other first inner hole 3, the other third inner hole 5 and the other eighth inner hole 10 are sequentially processed in the inner cavity of the right side of the bearing seat shell from right to left, and the ninth inner hole 20 penetrates through the cavities of the left side and the right side;
the plurality of inner holes at the cylinder openings at the left end and the right end of the bearing seat shell comprise a seventh inner hole 9, two sixth inner holes 8 and four fifth inner holes 7; the seventh inner hole 9, one of the sixth inner holes 8 and two of the fifth inner holes 7 are arranged at the cylinder opening at the left end of the bearing seat shell, the sixth inner hole 8 is arranged between the two fifth inner holes 7, the seventh inner hole 9 is positioned at one side of the fifth inner hole 7, and the seventh inner hole 9 is also positioned at the outer side of the cylinder opening at the left end of the bearing seat shell; the other sixth inner hole 8 and the other two fifth inner holes 7 are arranged at the cylinder opening at the right end of the bearing seat shell, and the sixth inner hole 8 is arranged between the two fifth inner holes 7;
the processing steps of the bearing seat shell are as follows:
the method comprises the following steps: 1) roughly machining a blank, roughly machining the outer circle and the end face of the outer circle of the blank on a numerically controlled lathe to form a cylindrical workpiece, wherein the outer circle is exposed to light, 2-3 mm of finish machining allowance is reserved for the outer circle of the cylindrical workpiece, and 1-2 mm of finish machining allowance is reserved for the end face of the outer circle of the cylindrical workpiece;
2) dividing the cylindrical workpiece into two identical semi-annular workpieces along the axis of the cylinder by using linear cutting equipment, finely machining the median planes of the semi-annular workpieces, and scraping the median planes of the two semi-annular workpieces until the roughness of the median planes of the two semi-annular workpieces is ensured to reach 0.4 and the parallelism between the median planes of the two semi-annular workpieces is ensured;
3) combining the two semi-annular workpieces, aligning the split surfaces of the two semi-annular workpieces, drilling holes for combining the two semi-annular workpieces by using a drilling machine, wherein the holes comprise threaded holes and positioning holes, and processing internal threads of the threaded holes by using a screw tap;
step two: semi-finish machining the outer circle of the semi-annular workpiece, clamping the semi-annular workpiece by using a clamp, simultaneously fixing the two semi-annular workpieces on a workbench of a grinding machine, wherein the bisector surfaces of the two semi-annular workpieces face the workbench, finely grinding the outer circle of the semi-annular workpiece by using the grinding machine, and reserving a fine grinding allowance of 0.2-0.4 mm for the outer circle of the cylindrical workpiece;
step three: firstly, mounting a positioning pin in a positioning hole, then screwing two semi-annular workpieces by using a bolt, and combining the two semi-annular workpieces into a cylindrical workpiece;
step four: a plurality of inner holes in the bearing seat shell, the end surfaces of the left end and the right end of the bearing seat shell and the excircle of the bearing seat shell are accurately turned by a precise numerical control lathe,
1) turning and polishing the outer circle and the end surface of the outer circle of the cylindrical workpiece by taking the outer circle of the cylindrical workpiece accurately ground by the grinding machine as a reference;
2) clamping the right end of the excircle of the cylindrical workpiece, aligning within 0.02mm by taking the excircle and the excircle end face of the cylindrical workpiece as references, mounting an eccentric taper-like big-end cutter bar 14 on a cutter frame of a lathe, firstly, using the eccentric taper-like big-end cutter bar 14 to accurately machine a first inner hole 3 in an inner cavity at the left side of a bearing seat shell, using the inner diameter of the first inner hole 3 as a reference, using the eccentric taper-like big-end cutter bar 14 to accurately machine a second inner hole 4 and a third inner hole 5 in the inner cavity at the left side of the bearing seat shell, mounting an eccentric lengthened big-end cutter bar 15 on the cutter frame of the lathe, and using the eccentric lengthened big-end cutter bar 15 to accurately machine an eighth inner hole 10 in the inner cavity at; using a cutter bar to lathe two fifth inner holes 7, a sixth inner hole 8 and a seventh inner hole 9 at the left end opening of the bearing seat shell; ensuring the form and position tolerance of each inner hole relative to the first inner hole 3;
turning an inner cavity of the bearing seat shell, and reserving a finish machining allowance of 0.2 mm;
aligning within 0.02mm by taking the inner diameter of the first inner hole 3 as a reference, and aligning the first excircle 12 of the bearing seat shell and the left end face of the bearing seat shell to ensure the coaxiality of the bearing seat shell and the inner hole;
3) clamping the left end of a first excircle 12 of a cylindrical workpiece, taking the first excircle 12 and the end face of the excircle of the cylindrical workpiece as references to align within 0.02mm, mounting an eccentric taper-like big-end cutter bar 14 on a cutter rest of a lathe, firstly turning a first inner hole 3 in the inner cavity at the right side of a bearing seat shell by using the eccentric taper-like big-end cutter bar 14, and turning a second inner hole 4 and a third inner hole 5 in the inner cavity at the right side of the bearing seat shell by using the eccentric taper-like big-end cutter bar 14 as a reference by using the inner diameter of the first inner hole 3; installing the eccentric lengthened big-end cutter bar 15 on a cutter frame of a lathe, and utilizing the eccentric lengthened big-end cutter bar 15 to lathe an eighth inner hole 10 in an inner cavity at the right side of the bearing seat shell; using a cutter bar to lathe two fifth inner holes 7 and a sixth inner hole 8 at a cylinder opening at the right end of the bearing seat shell; ensuring the form and position tolerance of each inner hole relative to the first inner hole 3;
turning a fillet in the bearing seat shell and the width of the inner cavity of the bearing seat shell;
the inner diameter of the first inner hole 3 is used as a reference to be found within 0.02mm, and the right end face of the bearing seat shell, the second excircle 13 of the bearing seat shell, the excircle of the annular bulge 11 of the bearing seat shell and the end faces of the two ends of the annular bulge 11 are accurately turned;
step five: opening the two semi-annular bearing seat shells 1 by a bench worker;
step six: processing holes for assembling two semi-annular bearing seat shells 1;
step seven: and (7) oil sealing.
The invention has the beneficial effects that:
1. in the original processing method, when a plurality of inner holes in a bearing seat shell, an outer circular surface of the bearing seat shell and end surfaces at the left end and the right end of the bearing seat shell are processed, a lathe is generally adopted to finish the outer circular surface and the end surfaces at the left end and the right end of the bearing seat shell, two semi-annular bearing seat shells are opened, a boring machine is adopted to roughly bore a plurality of inner holes in the two semi-annular bearing seat shells, the two semi-annular bearing seat shells are fastened, the lathe is adopted to accurately lathe the plurality of inner holes of the bearing seat shells, the processing steps are multiple, and the problem of upper half staggered teeth and lower;
the processing method can process a plurality of inner holes in the bearing seat shell, the outer circular surface of the bearing seat shell and the end surfaces of the left end and the right end of the bearing seat shell by only using a lathe, thereby shortening the processing steps;
2. the processing method solves the problems of inconsistent sizes of the same inner holes and staggered teeth of the upper half and the lower half of bearing seat shell products with small orifices and large cavities, ensures the consistency of the sizes of the inner holes of the products, and improves the processing quality and the processing efficiency of the products;
3. the processing of all sizes of inner holes and excircles in the bearing seat shell is finished on a lathe through one-time clamping, the standard is unified, and the requirements of geometric tolerance and dimensional tolerance of drawings can be better guaranteed.
Drawings
FIG. 1 is a front view of a bearing housing with a small orifice, large cavity;
FIG. 2 is a cross-sectional view of FIG. 1;
FIG. 3 is a top view of FIG. 1;
FIG. 4 is a perspective view of a bearing housing with a small orifice, large cavity;
FIG. 5 is a cross-sectional view at the first bolt hole B-B;
FIG. 6 is a cross-sectional view at the second bolt hole C-C;
FIG. 7 is a cross-sectional view at the third bolt hole D-D;
FIG. 8 is a perspective view of the eccentric elongated shank;
FIG. 9 is a side view of the eccentric elongated large head arbor;
FIG. 10 is a top view of a bit of the eccentric elongated large head arbor;
FIG. 11 is a side view of the eccentric taper-like shank;
FIG. 12 is a top view of the eccentric tapered shank.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings:
the first embodiment is as follows: as shown in fig. 1 and 2, the bearing housing according to the present embodiment is formed by splicing two identical semi-annular bearing housings 1;
a group of holes are respectively formed in the front end and the rear end of each semi-annular bearing seat shell 1, and the median planes of the two semi-annular bearing seat shells 1 are aligned and fixedly connected through bolts;
the outer surface of the bearing seat shell is provided with a circle of bulges to form an annular bulge 11, the annular bulge 11 is close to the right end of the bearing seat shell, and the axis of the annular bulge 11 is superposed with the axis of the bearing seat shell; the diameter of the first outer circle 12 of the bearing housing on the left side of the annular projection 11 is greater than the diameter of the second outer circle 13 of the bearing housing on the right side of the annular projection 11;
the calibers of the cylinder openings at the left end and the right end of the bearing seat shell are smaller than the diameter of the cavity of the inner cavity of the bearing seat shell; a plurality of parallel inner holes are respectively formed in the inner cavity of the bearing seat shell and at the cylinder openings at the left end and the right end of the bearing seat shell, and the axes of the inner holes are superposed with the axis of the bearing seat shell;
the inner holes in the inner cavity of the bearing seat shell comprise a ninth inner hole 20, two first inner holes 3, two second inner holes 4, two third inner holes 5 and two eighth inner holes 10, wherein one second inner hole 4, one first inner hole 3, one third inner hole 5 and one eighth inner hole 10 are sequentially processed in the inner cavity of the left side of the bearing seat shell from left to right, the other second inner hole 4, the other first inner hole 3, the other third inner hole 5 and the other eighth inner hole 10 are sequentially processed in the inner cavity of the right side of the bearing seat shell from right to left, and the ninth inner hole 20 penetrates through the cavities of the left side and the right side;
the plurality of inner holes at the cylinder openings at the left end and the right end of the bearing seat shell comprise a seventh inner hole 9, two sixth inner holes 8 and four fifth inner holes 7; the seventh inner hole 9, one of the sixth inner holes 8 and two of the fifth inner holes 7 are arranged at the cylinder opening at the left end of the bearing seat shell, the sixth inner hole 8 is arranged between the two fifth inner holes 7, the seventh inner hole 9 is positioned at one side of the fifth inner hole 7, and the seventh inner hole 9 is also positioned at the outer side of the cylinder opening at the left end of the bearing seat shell; the other sixth inner hole 8 and the other two fifth inner holes 7 are arranged at the cylinder opening at the right end of the bearing seat shell, and the sixth inner hole 8 is arranged between the two fifth inner holes 7;
the processing steps of the bearing seat shell are as follows:
the method comprises the following steps: 1) roughly machining a blank, roughly machining the outer circle and the end face of the outer circle of the blank on a numerically controlled lathe to form a cylindrical workpiece, wherein the outer circle is exposed to light, 2-3 mm of finish machining allowance is reserved for the outer circle of the cylindrical workpiece, and 1-2 mm of finish machining allowance is reserved for the end face of the outer circle of the cylindrical workpiece;
2) dividing the cylindrical workpiece into two identical semi-annular workpieces along the axis of the cylinder by using linear cutting equipment, finely machining the median planes of the semi-annular workpieces, and scraping the median planes of the two semi-annular workpieces until the roughness of the median planes of the two semi-annular workpieces is ensured to reach 0.4 and the parallelism between the median planes of the two semi-annular workpieces is ensured;
3) combining the two semi-annular workpieces, aligning the split surfaces of the two semi-annular workpieces, drilling holes for combining the two semi-annular workpieces by using a drilling machine, wherein the holes comprise threaded holes and positioning holes, and processing internal threads of the threaded holes by using a screw tap;
step two: semi-finish machining the outer circle of the semi-annular workpiece, clamping the semi-annular workpiece by using a clamp, simultaneously fixing the two semi-annular workpieces on a workbench of a grinding machine, wherein the bisector surfaces of the two semi-annular workpieces face the workbench, finely grinding the outer circle of the semi-annular workpiece by using the grinding machine, and reserving a fine grinding allowance of 0.2-0.4 mm for the outer circle of the cylindrical workpiece;
step three: firstly, mounting a positioning pin in a positioning hole, then screwing two semi-annular workpieces by using a bolt, and combining the two semi-annular workpieces into a cylindrical workpiece;
step four: a plurality of inner holes in the bearing seat shell, the end surfaces of the left end and the right end of the bearing seat shell and the excircle of the bearing seat shell are accurately turned by a precise numerical control lathe,
1) turning and polishing the outer circle and the end surface of the outer circle of the cylindrical workpiece by taking the outer circle of the cylindrical workpiece accurately ground by the grinding machine as a reference;
2) clamping the right end of the excircle of the cylindrical workpiece, aligning within 0.02mm by taking the excircle and the excircle end face of the cylindrical workpiece as references, mounting an eccentric taper-like big-end cutter bar 14 on a cutter frame of a lathe, firstly, using the eccentric taper-like big-end cutter bar 14 to accurately machine a first inner hole 3 in an inner cavity at the left side of a bearing seat shell, using the inner diameter of the first inner hole 3 as a reference, using the eccentric taper-like big-end cutter bar 14 to accurately machine a second inner hole 4 and a third inner hole 5 in the inner cavity at the left side of the bearing seat shell, mounting an eccentric lengthened big-end cutter bar 15 on the cutter frame of the lathe, and using the eccentric lengthened big-end cutter bar 15 to accurately machine an eighth inner hole 10 in the inner cavity at; using a conventional cutter bar to lathe two fifth inner holes 7, a sixth inner hole 8 and a seventh inner hole 9 at the left end cylindrical opening of the bearing seat shell; ensuring the form and position tolerance of each inner hole relative to the first inner hole 3;
turning an inner cavity of the bearing seat shell, and reserving a finish machining allowance of 0.2 mm;
aligning within 0.02mm by taking the inner diameter of the first inner hole 3 as a reference, and aligning the first excircle 12 of the bearing seat shell and the left end face of the bearing seat shell to ensure the coaxiality of the bearing seat shell and the inner hole;
3) clamping the left end of a first excircle 12 of a cylindrical workpiece, taking the first excircle 12 and the end face of the excircle of the cylindrical workpiece as references to align within 0.02mm, mounting an eccentric taper-like big-end cutter bar 14 on a cutter rest of a lathe, firstly turning a first inner hole 3 in the inner cavity at the right side of a bearing seat shell by using the eccentric taper-like big-end cutter bar 14, and turning a second inner hole 4 and a third inner hole 5 in the inner cavity at the right side of the bearing seat shell by using the eccentric taper-like big-end cutter bar 14 as a reference by using the inner diameter of the first inner hole 3; installing the eccentric lengthened big-end cutter bar 15 on a cutter frame of a lathe, and utilizing the eccentric lengthened big-end cutter bar 15 to lathe an eighth inner hole 10 in an inner cavity at the right side of the bearing seat shell; using a conventional cutter bar to lathe two fifth inner holes 7 and a sixth inner hole 8 at a cylinder opening at the right end of the bearing seat shell; ensuring the form and position tolerance of each inner hole relative to the first inner hole 3;
turning a fillet in the bearing seat shell and the width of the inner cavity of the bearing seat shell;
the inner diameter of the first inner hole 3 is used as a reference to be found within 0.02mm, and the right end face of the bearing seat shell, the second excircle 13 of the bearing seat shell, the excircle of the annular bulge 11 of the bearing seat shell and the end faces of the two ends of the annular bulge 11 are accurately turned;
step five: opening the two semi-annular bearing seat shells 1 by a bench worker;
step six: processing holes for assembling two semi-annular bearing seat shells 1;
step seven: and (7) oil sealing.
The feeding amount of the lathe is 40-48, and the processing rotating speed is 500-600 revolutions per minute;
the second embodiment is as follows: as shown in fig. 11 and 12, the eccentric taper-imitating big-end cutter bar 14 in the fourth step of the present embodiment comprises a first connecting rod 14-1, a first cutter bar seat 14-2 and a first cutter seat 14-3; the radial section of the first connecting rod 14-1 is cone-shaped;
the top end of a first connecting rod 14-1 is fixedly connected with the bottom end of a first cutter seat 14-3, and the bottom end of the first connecting rod 14-1 is fixedly connected with one end of a first cutter rod seat 14-2; the side ends of the first connecting rod 14-1, the first cutter seat 14-3 and the first cutter seat 14-2 are flush, and the axial center line of the first connecting rod 14-1 is closer to the flush position of the side ends than the axis of the first cutter seat 14-2 and the axis of the first cutter seat 14-3;
the first tool seat 14-3 is provided with a first clamping groove 14-3-1, one side wall of the first clamping groove 14-3-1 is provided with two bolt holes with internal threads, and a screw penetrates through the bolt holes to fasten the tool.
Only turning a first inner hole 3, a second inner hole 4 and a third inner hole 5 by utilizing an eccentric taper-like big-end cutter bar 14, if the first inner hole 3, the second inner hole 4 and the third inner hole 5 are turned by utilizing a conventional cutter bar, the interference phenomenon of the cutter bar and a fifth inner hole occurs, so that the first inner hole 3, the second inner hole 4 and the third inner hole 5 are usually bored by using a boring machine in the past processing, the phenomenon can be avoided by utilizing the eccentric taper-like big-end cutter bar, and the first inner hole 3, the second inner hole 4 and the third inner hole 5 can be directly turned by utilizing the eccentric taper-like big-end cutter bar.
Other components and connection modes are the same as those of the first embodiment.
The third concrete implementation mode: as shown in fig. 8 to 10, the eccentric lengthened big-head toolbar 15 in step four of the present embodiment includes a second connecting rod 15-1, a second toolbar holder 15-2 and a second toolbar holder 15-3;
the top end of the second connecting rod 15-1 is fixedly connected with the bottom end of the second cutter holder 15-3, and the bottom end of the second connecting rod 15-1 is fixedly connected with one end of the second cutter holder 15-2; the side ends of the second connecting rod 15-1, the second cutter bar seat 15-2 and the second cutter bar seat 15-3 are flush, and the axis of the second connecting rod 15-1 is closer to the flush position of the side ends than the axis of the second cutter bar seat 15-2 and the axis of the second cutter bar seat 15-3;
the second tool seat 15-3 is provided with a second clamping groove 15-3-1, one side wall of the second clamping groove 15-3-1 is provided with two bolt holes with internal threads, and a screw penetrates through the bolt holes to fasten the tool.
The eccentric lengthened large-head cutter bar 15 is used for only turning the eighth inner hole 10, if the conventional cutter bar is used for turning the eighth inner hole 10, the cutter bar and the fifth inner hole have an interference phenomenon, so that a boring machine is usually used for boring the eighth inner hole 10 in the past, the eccentric lengthened large-head cutter bar 15 is used for avoiding the phenomenon, and the eccentric lengthened large-head cutter bar 15 can be directly used for directly turning the eighth inner hole 10.
Other components and connection modes are the same as those of the first or second embodiment modes.
The fourth concrete implementation mode: as shown in fig. 1 to 7, each set of holes according to the present embodiment includes two bolt holes 19 and two positioning holes, i.e., a first positioning hole 17 and a second positioning hole 18, respectively, which are located between the two bolt holes 19.
The other components and the connection mode are the same as those of the first, second or third embodiment modes.
The fifth concrete implementation mode: as shown in fig. 1 to 4, end faces of both ends of the annular protrusion 11 in the fourth step of the present embodiment are perpendicular to the axis of the bearing housing.
Other components and connection modes are the same as any one of the first to the fourth embodiments.
Example 1:
wherein the size of the bearing seat shell with the small hole and the large cavity is as follows: the outer diameter of the annular protrusion 11 is 358mm, the width is 20mm, the height is 12mm, the outer diameter of the first outer circle 12 is 320.2(-0.032,0) mm, the width is 235mm, the outer diameter of the second outer circle 13 is 318mm, the inner diameter of the first inner hole 3 is 245(0, +0.046) mm, the inner diameter of the second inner hole 4 is 246.5mm, the inner diameter of the third inner hole 5 is 255mm, the inner diameter of the fifth inner hole 7 is 140mm, the inner diameter of the sixth inner hole 8 is 164mm, the inner diameter of the seventh inner hole 9 is 200mm, the inner diameter of the eighth inner hole 10 is 267.5mm, and the width of the inner cavity of the bearing seat shell is 187 +/-0.2 mm;
the processing steps of the bearing seat shell are as follows:
the method comprises the following steps: 1) roughly machining a blank, roughly machining the outer circle and the outer circle end face of the blank on a numerically controlled lathe to form a cylindrical workpiece, wherein the outer circle is exposed to light, the diameter of the outer circle of the cylindrical workpiece is 360mm, and a 2mm finish machining allowance is reserved on the outer circle end face of the cylindrical workpiece;
2) dividing the cylindrical workpiece into two identical semi-annular workpieces along the axis of the cylinder by using linear cutting equipment, finely machining the median planes of the semi-annular workpieces, and scraping the median planes of the two semi-annular workpieces until the roughness of the median planes of the two semi-annular workpieces is ensured to reach 0.4 and the parallelism between the median planes of the two semi-annular workpieces is ensured;
3) combining the two semi-annular workpieces, aligning the bisection planes of the two semi-annular workpieces, drilling holes for combining the two semi-annular workpieces by using a drilling machine, wherein the holes comprise two bolt holes 19, a first positioning hole 17 and a second positioning hole 18, and machining internal threads of the bolt holes 19 by using a screw tap;
step two: semi-finish machining the outer circle of the semi-annular workpiece, clamping the semi-annular workpiece by using a clamp, simultaneously fixing two semi-annular workpieces on a workbench of a grinding machine, wherein the bisector of the two semi-annular workpieces faces the workbench, finely grinding the outer circle of the semi-annular workpiece by using the grinding machine, and the diameter of the outer circle of the cylindrical workpiece is 358.4 mm;
step three: firstly, mounting positioning pins in a first positioning hole 17 and a second positioning hole 18, then screwing two semi-annular workpieces by using bolts, and combining the two semi-annular workpieces into a cylindrical workpiece;
step four: a plurality of inner holes in the bearing seat shell, the end surfaces of the left end and the right end of the bearing seat shell and the excircle of the bearing seat shell are accurately turned by a precise numerical control lathe,
1) turning the excircle and the excircle end face of the cylindrical workpiece by using the excircle reference of which the diameter of the cylindrical workpiece ground by the grinding machine is 358.4 mm;
2) clamping the right end of the excircle of the cylindrical workpiece, aligning within 0.02mm by taking the excircle and the end face of the excircle of the cylindrical workpiece as references, mounting an eccentric taper-like big-end cutter bar 14 on a cutter frame of a lathe, firstly turning a first inner hole 3 with the inner diameter of 245(0, +0.046) mm in an inner cavity at the left side of a bearing seat shell by using the eccentric taper-like big-end cutter bar 14, then turning a second inner hole 4 with the inner diameter of 246.5mm and a third inner hole 5 with the inner diameter of 255mm in an inner cavity at the left side of the bearing seat shell by using the eccentric taper-like big-end cutter bar 14 as references, mounting an eccentric lengthened big-end cutter bar 15 on the cutter frame of the lathe, and turning an eighth inner hole 10 with the inner diameter of 267.5mm in the inner cavity at the left side of the bearing seat shell by using the eccentric lengthened big-end cutter bar 15; using a cutter bar to lathe two fifth inner holes 7 with the inner diameter of 140mm, a sixth inner hole 8 with the inner diameter of 164mm and a seventh inner hole 9 with the inner diameter of 200mm at a cylinder opening at the left end of a bearing seat shell; ensuring the form and position tolerance of each inner hole relative to the first inner hole 3;
turning an inner cavity of the bearing seat shell, and reserving a finish machining allowance of 0.2 mm;
the inner diameter 245(0, +0.046) mm of the first inner hole 3 is used as a reference to be aligned within 0.02mm, the first excircle 12 of the bearing seat shell and the left end face of the bearing seat shell are aligned, and the coaxiality of the bearing seat shell and the inner hole is ensured;
3) clamping the left end of a first excircle 12 of a cylindrical workpiece, aligning within 0.02mm by taking the first excircle 12 and an excircle end face of the cylindrical workpiece as references, mounting an eccentric taper-like big-end cutter bar 14 on a cutter rest of a lathe, firstly turning a first inner hole 3 with the inner diameter of 245(0, +0.046) mm in an inner cavity at the right side of a bearing seat shell by using the eccentric taper-like big-end cutter bar 14, and turning a second inner hole 4 with the inner diameter of 246.5mm and a third inner hole 5 with the inner diameter of 255mm in the inner cavity at the right side of the bearing seat shell by using the eccentric taper-like big-end cutter bar 14 by using the inner diameter of 245(0, +0.046) mm of the first inner hole 3 as references; installing the eccentric lengthened big-end cutter bar 15 on a cutter frame of a lathe, and utilizing the eccentric lengthened big-end cutter bar 15 to lathe an eighth inner hole 10 with the inner diameter of 267.5mm in an inner cavity at the right side of the bearing seat shell; using a cutter bar to lathe two fifth inner holes 7 with the inner diameter of 140mm and a sixth inner hole 8 with the inner diameter of 164mm at a cylinder opening at the right end of the bearing seat shell; ensuring the form and position tolerance of each inner hole relative to the first inner hole 3;
turning a fillet in the bearing seat shell and the width of the inner cavity of the bearing seat shell;
the inner diameter 245(0, +0.046) mm of the first inner hole 3 is used as a reference to be aligned within 0.02mm, and the right end face of the bearing seat shell, the second excircle 13 of the bearing seat shell, the excircle of the annular bulge 11 of the bearing seat shell and the end faces of the two ends of the annular bulge 11 are aligned;
step five: opening the two semi-annular bearing seat shells 1 by a bench worker;
step six: processing holes for assembling two semi-annular bearing seat shells 1;
step seven: and (7) oil sealing.
Claims (5)
1. A processing method of a bearing seat shell with a small hole and a large cavity is characterized in that:
the bearing seat shell is formed by splicing two identical semi-annular bearing seat shells (1);
a group of holes are respectively formed in the front end and the rear end of each semi-annular bearing seat shell (1), and the middle planes of the two semi-annular bearing seat shells (1) are aligned and fixedly connected through bolts;
the outer surface of the bearing seat shell is provided with a circle of bulges to form an annular bulge (11), the annular bulge (11) is close to the right end of the bearing seat shell, and the axis of the annular bulge (11) is superposed with the axis of the bearing seat shell; the diameter of a first excircle (12) of the bearing seat shell on the left side of the annular bulge (11) is larger than that of a second excircle (13) of the bearing seat shell on the right side of the annular bulge (11);
the calibers of the cylinder openings at the left end and the right end of the bearing seat shell are smaller than the diameter of the cavity of the inner cavity of the bearing seat shell; a plurality of parallel inner holes are respectively formed in the inner cavity of the bearing seat shell and at the cylinder openings at the left end and the right end of the bearing seat shell, and the axes of the inner holes are superposed with the axis of the bearing seat shell;
the bearing seat shell comprises a plurality of inner holes, wherein the plurality of inner holes in an inner cavity of the bearing seat shell comprise a ninth inner hole (20), two first inner holes (3), two second inner holes (4), two third inner holes (5) and two eighth inner holes (10), one second inner hole (4), one first inner hole (3), one third inner hole (5) and one eighth inner hole (10) are sequentially processed in the inner cavity of the left side of the bearing seat shell from left to right, the other second inner hole (4), the other first inner hole (3), the other third inner hole (5) and the other eighth inner hole (10) are sequentially processed in the inner cavity of the right side of the bearing seat shell from right to left, and the ninth inner hole (20) penetrates through cavities on the left side and the right side;
the plurality of inner holes at the cylinder openings at the left end and the right end of the bearing seat shell comprise a seventh inner hole (9), two sixth inner holes (8) and four fifth inner holes (7); the seventh inner hole (9), one of the sixth inner holes (8) and two of the fifth inner holes (7) are arranged at the cylinder opening at the left end of the bearing seat shell, the sixth inner hole (8) is arranged between the two fifth inner holes (7), the seventh inner hole (9) is positioned at one side of the fifth inner hole (7), and the seventh inner hole (9) is also positioned at the outer side of the cylinder opening at the left end of the bearing seat shell; the other sixth inner hole (8) and the other two fifth inner holes (7) are arranged at the cylinder opening at the right end of the bearing seat shell, and the sixth inner hole (8) is arranged between the two fifth inner holes (7);
the processing steps of the bearing seat shell are as follows:
the method comprises the following steps: 1) roughly machining a blank, roughly machining the outer circle and the end face of the outer circle of the blank on a numerically controlled lathe to form a cylindrical workpiece, wherein the outer circle is exposed to light, 2-3 mm of finish machining allowance is reserved for the outer circle of the cylindrical workpiece, and 1-2 mm of finish machining allowance is reserved for the end face of the outer circle of the cylindrical workpiece;
2) dividing the cylindrical workpiece into two identical semi-annular workpieces along the axis of the cylinder by using linear cutting equipment, finely machining the median planes of the semi-annular workpieces, and scraping the median planes of the two semi-annular workpieces until the roughness of the median planes of the two semi-annular workpieces is ensured to reach 0.4 and the parallelism between the median planes of the two semi-annular workpieces is ensured;
3) combining the two semi-annular workpieces, aligning the split surfaces of the two semi-annular workpieces, drilling holes for combining the two semi-annular workpieces by using a drilling machine, wherein the holes comprise threaded holes and positioning holes, and processing internal threads of the threaded holes by using a screw tap;
step two: semi-finish machining the outer circle of the semi-annular workpiece, clamping the semi-annular workpiece by using a clamp, simultaneously fixing the two semi-annular workpieces on a workbench of a grinding machine, wherein the bisector surfaces of the two semi-annular workpieces face the workbench, finely grinding the outer circle of the semi-annular workpiece by using the grinding machine, and reserving a fine grinding allowance of 0.2-0.4 mm for the outer circle of the cylindrical workpiece;
step three: firstly, mounting a positioning pin in a positioning hole, then screwing two semi-annular workpieces by using a bolt, and combining the two semi-annular workpieces into a cylindrical workpiece;
step four: a plurality of inner holes in the bearing seat shell, the end surfaces of the left end and the right end of the bearing seat shell and the excircle of the bearing seat shell are accurately turned by a precise numerical control lathe,
1) turning and polishing the outer circle and the end surface of the outer circle of the cylindrical workpiece by taking the outer circle of the cylindrical workpiece accurately ground by the grinding machine as a reference;
2) clamping the right end of the excircle of the cylindrical workpiece, aligning within 0.02mm by taking the excircle and the end face of the excircle of the cylindrical workpiece as references, installing an eccentric taper-like big-end cutter bar (14) on a cutter frame of a lathe, firstly, using the eccentric taper-like big-end cutter bar (14) to accurately turn a first inner hole (3) in the left inner cavity of a bearing seat shell, using the inner diameter of the first inner hole (3) as a reference, using the eccentric taper-like big-end cutter bar (14) to accurately turn a second inner hole (4) and a third inner hole (5) in the left inner cavity of the bearing seat shell, installing an eccentric lengthened big-end cutter bar (15) on the cutter frame of the lathe, and using the eccentric lengthened big-end cutter bar (15) to accurately turn an eighth inner hole (10) in the left inner cavity of; using a cutter bar to lathe two fifth inner holes (7), a sixth inner hole (8) and a seventh inner hole (9) at the left end opening of the bearing seat shell; ensuring the form and position tolerance of each inner hole relative to the first inner hole (3);
turning an inner cavity of the bearing seat shell, and reserving a finish machining allowance of 0.2 mm;
the inner diameter of the first inner hole (3) is used as a reference for alignment within 0.02mm, a first excircle (12) of the bearing seat shell and the left end face of the bearing seat shell are aligned, and the coaxiality of the bearing seat shell and the inner hole is ensured;
3) clamping the left end of a first excircle (12) of a cylindrical workpiece, aligning within 0.02mm by taking the first excircle (12) and an excircle end face of the cylindrical workpiece as references, mounting an eccentric taper-imitating big-end cutter bar (14) on a cutter rest of a lathe, firstly turning a first inner hole (3) in an inner cavity at the right side of a bearing seat shell by using the eccentric taper-imitating big-end cutter bar (14), and turning a second inner hole (4) and a third inner hole (5) in the inner cavity at the right side of the bearing seat shell by using the eccentric taper-imitating big-end cutter bar (14) by taking the inner diameter of the first inner hole (3) as a reference; the eccentric lengthened big-end cutter rod (15) is arranged on a cutter frame of a lathe, and an eighth inner hole (10) in the inner cavity at the right side of the bearing seat shell is machined by the eccentric lengthened big-end cutter rod (15); using a cutter bar to lathe two fifth inner holes (7) and a sixth inner hole (8) at a cylinder opening at the right end of the bearing seat shell; ensuring the form and position tolerance of each inner hole relative to the first inner hole (3);
turning a fillet in the bearing seat shell and the width of the inner cavity of the bearing seat shell;
the inner diameter of the first inner hole (3) is used as a reference to be aligned within 0.02mm, and the right end face of the bearing seat shell, the second excircle (13) of the bearing seat shell, the excircle of the annular bulge (11) of the bearing seat shell and the end faces of the two ends of the annular bulge (11) are aligned;
step five: opening the two semi-annular bearing seat shells (1) by a bench worker;
step six: processing holes for assembling of two semi-annular bearing seat shells (1);
step seven: and (7) oil sealing.
2. The processing method of the bearing seat shell with the small hole and the large cavity as claimed in claim 1, wherein the processing method comprises the following steps: the eccentric taper-imitating big-end cutter bar (14) in the fourth step comprises a first connecting rod (14-1), a first cutter bar seat (14-2) and a first cutter seat (14-3); the radial section of the first connecting rod (14-1) is cone-shaped;
the top end of a first connecting rod (14-1) is fixedly connected with the bottom end of a first cutter seat (14-3), and the bottom end of the first connecting rod (14-1) is fixedly connected with one end of a first cutter rod seat (14-2); the side ends of the first connecting rod (14-1), the first cutter seat (14-3) and the first cutter seat (14-2) are flush, and the axial center line of the first connecting rod (14-1) is closer to the flush position of the side ends than the axis of the first cutter seat (14-2) and the axis of the first cutter seat (14-3);
the first tool seat (14-3) is provided with a first clamping groove (14-3-1), one side wall of the first clamping groove (14-3-1) is provided with two bolt holes with internal threads, and a screw penetrates through the bolt holes to fasten the tool.
3. The processing method of the bearing seat shell with the small hole and the large cavity as claimed in claim 1, wherein the processing method comprises the following steps: the eccentric lengthened big head cutter bar (15) in the fourth step comprises a second connecting rod (15-1), a second cutter bar seat (15-2) and a second cutter seat (15-3);
the top end of the second connecting rod (15-1) is fixedly connected with the bottom end of the second cutter holder (15-3), and the bottom end of the second connecting rod (15-1) is fixedly connected with one end of the second cutter holder (15-2); the side ends of the second connecting rod (15-1), the second cutter bar seat (15-2) and the second cutter bar seat (15-3) are flush, and the axis of the second connecting rod (15-1) is closer to the flush position of the side ends than the axis of the second cutter bar seat (15-2) and the axis of the second cutter bar seat (15-3);
a second clamping groove (15-3-1) is arranged on the second cutter seat (15-3), two bolt holes with internal threads are formed in one side wall of the second clamping groove (15-3-1), and a screw penetrates through the bolt holes to fasten the cutter.
4. The processing method of the bearing seat shell with the small hole and the large cavity as claimed in claim 1, wherein the processing method comprises the following steps: each group of holes respectively comprises two bolt holes (19) and two positioning holes, the two positioning holes are respectively a first positioning hole (17) and a second positioning hole (18), and the two positioning holes are located between the two bolt holes (19).
5. The processing method of the bearing seat shell as claimed in claim 1, wherein the end surfaces of the two ends of the annular bulge (11) in the fourth step are respectively perpendicular to the axis of the bearing seat shell.
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| CN201811503395.1A CN109648260B (en) | 2018-12-10 | 2018-12-10 | Method for processing bearing seat shell with small hole and large cavity |
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| CN201811503395.1A CN109648260B (en) | 2018-12-10 | 2018-12-10 | Method for processing bearing seat shell with small hole and large cavity |
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| CN109648260B true CN109648260B (en) | 2020-09-29 |
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| CN110270800B (en) * | 2019-07-04 | 2021-02-12 | 哈尔滨汽轮机厂有限责任公司 | Machining method of vortex-enhanced bearing |
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| CN112571093A (en) * | 2020-12-22 | 2021-03-30 | 苏州萨伯工业设计有限公司 | Lathe tool rest and manufacturing method thereof |
| CN114571185A (en) * | 2021-10-20 | 2022-06-03 | 重庆江增船舶重工有限公司 | Machining and detecting method of split type bearing seat |
| CN114406629B (en) * | 2022-01-19 | 2023-06-27 | 武汉船用机械有限责任公司 | Processing method of spherical bearing bush mechanism |
| CN114799755B (en) * | 2022-04-29 | 2023-08-04 | 沈阳透平机械股份有限公司 | Method for machining abdominal cavity of horizontal split compressor shell by boring machine |
| CN115319408B (en) * | 2022-07-27 | 2023-06-09 | 江阴市美托金属制品有限公司 | Processing technology of large cast iron bearing seat |
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Effective date of registration: 20221214 Address after: 150000 building 3, high tech production base, Nangang District, Harbin City, Heilongjiang Province Patentee after: HARBIN TURBINE Co.,Ltd. Patentee after: HADIAN POWER EQUIPMENT NATIONAL ENGINEERING RESEARCH CENTER CO.,LTD. Address before: 150046 No. three power road 345, Xiangfang District, Heilongjiang, Harbin Patentee before: HARBIN TURBINE Co.,Ltd. |