CN113977518B - Precise assembly fixture and assembly method for bearing sleeve of supporting casing - Google Patents
Precise assembly fixture and assembly method for bearing sleeve of supporting casing Download PDFInfo
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- CN113977518B CN113977518B CN202111339531.XA CN202111339531A CN113977518B CN 113977518 B CN113977518 B CN 113977518B CN 202111339531 A CN202111339531 A CN 202111339531A CN 113977518 B CN113977518 B CN 113977518B
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- bearing bush
- pressing plate
- stud
- pressing
- arc
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
- B25B27/02—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
-
- 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
- B23P11/00—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for
- B23P11/02—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for by first expanding and then shrinking or vice versa, e.g. by using pressure fluids; by making force fits
- B23P11/025—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for by first expanding and then shrinking or vice versa, e.g. by using pressure fluids; by making force fits by using heat or cold
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
- B25B11/02—Assembly jigs
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automatic Assembly (AREA)
- Mounting Of Bearings Or Others (AREA)
Abstract
The invention discloses a precise assembly fixture for a bearing bush of a supporting case and an assembly method. The chassis is provided with studs for connecting the pressing plate and a plurality of chassis bosses with positioning function, each chassis boss surface is provided with an arc positioning surface, and the pressing plate is provided with a plurality of arc pressing surfaces. When the supporting casing and the bearing bush are assembled, extrusion force is applied to the end face of the bearing bush through the pressing plate, so that the clearance between the lower end face of the bearing bush and the upper end face of the annular protrusion on the first inner circular face of the first installation edge meets the requirement. The invention has simple operation, high efficiency, uniform gap and high assembly quality.
Description
Technical Field
The invention belongs to the field of machining, and particularly relates to a precise assembly fixture and an assembly method for a supporting casing and a bearing bush.
Background
As shown in fig. 1, the bearing sleeve needs to be assembled during the machining process, and the radial fit of the bearing sleeve and the hole is interference fit (the outer diameter dimension of the bearing sleeve is 0.145-0.070 mm larger than the inner diameter of the first inner circular surface of the first mounting edge). The interference assembly method generally comprises a static force pressing method, a dynamic force pressing method and a temperature difference assembly method, and at present, the bearing bush is mainly soaked in liquid nitrogen and cooled to enable the bearing bush to shrink to an easy-assembly state, and when the bearing bush is restored to normal temperature, the bearing bush is expanded and in interference fit with the mounting edge. However, in practice, the bearing bush slowly pops up toward the top end during the normal temperature recovery process, and the gap between the bearing bush and the bottom of the mounting edge is difficult to ensure.
Because the required clearance (such as the axial clearance and the non-radial clearance of the lower end face of the bearing bush in fig. 3 and 4) between the bearing bush and the supporting casing assembly surface is not more than 0.02mm, in order to ensure the assembly clearance in the process of assembling the bearing bush, the clearance is usually adjusted by repeatedly beating the bearing bush, and the surface of the supporting casing is often damaged by smashing and knocking due to improper operation, and the surface is scratched, so that the processing quality of parts is seriously influenced, the development process of an engine is delayed, and the delivery of products is influenced.
In order to improve the processing quality of the supporting casing and improve the processing efficiency of the supporting casing, a special fixture and an assembly method for the supporting casing and the bearing bush are urgently needed to be designed for assembly of the supporting casing and the bearing bush, so that the processing quality of the supporting casing is ensured, and the operation of site workers is facilitated.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide the precise assembly fixture and the assembly method for the bearing sleeve of the supporting casing, which ensure that the clearance between the lower end of the bearing sleeve and the end face of the mounting edge (the upper end face of the annular bulge) of the supporting casing is not more than 0.02mm, simultaneously save repeated beating of workers, avoid the knocked-down, scratch and repeated inclination of parts caused by the beating of the parts, avoid the waste of a great deal of time and labor intensity and the increase of labor intensity caused by repeatedly correcting the parts to ensure the assembly clearance, reduce the processing cost of the parts, accelerate the production progress of the parts and effectively shorten the development process of an engine.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the utility model provides a support case bearing bush precision assembly anchor clamps, including coaxial first installation limit and second installation limit on the support case, first installation limit inboard is first interior round surface, and one end of first interior round surface has a annular arch, and second installation limit inboard is the second interior round surface, and bearing bush's outer round surface and first interior round surface interference fit have a clearance between bearing bush's lower terminal surface and the bellied up end of annular,
a stud;
the chassis is connected with one end of the stud, a plurality of chassis bosses protruding upwards are arranged on the upper end face of the chassis, an arc locating surface is arranged on the surface of each chassis boss, the arc locating surfaces of the chassis boss surfaces are all located on a first cylindrical surface taking the stud as an axis, and the outer diameter of the first cylindrical surface is equal to the inner diameter of the second inner circular surface;
the pressing plate is provided with a through hole, the pressing plate is connected with the stud through the through hole, the outer circumferential surface of the pressing plate is provided with a plurality of arc-shaped pressing surfaces, the arc-shaped pressing surfaces are all positioned on a second cylindrical surface taking the stud as an axis, and the outer diameter of the second cylindrical surface is equal to the inner diameter of the first inner circular surface.
Further, the chassis includes a plurality of linear legs, one end of the plurality of legs intersecting the stud.
Further, the four support legs are all arranged, and the included angle between every two adjacent support legs is 90 degrees.
Further, the clamp plate includes many sharp depression bars, and the one end of many depression bars intersects in the through-hole department, and the other end terminal surface of depression bar is the arc compression face.
Further, the number of the compression bars is three, and the included angle between every two adjacent compression bars is 120 degrees.
Further, the precision assembly fixture further comprises a nut coupled to the stud.
The method for precisely assembling the bearing bush of the supporting case comprises a first installation edge, wherein the inner side of the first installation edge is a first inner circular surface, one end of the first inner circular surface is provided with an annular bulge, the outer circular surface of the bearing bush is in interference fit with the first inner circular surface, a gap is reserved between the lower end surface of the bearing bush and the upper end surface of the annular bulge,
after the bearing bush is arranged in the first mounting edge, a limiting piece is arranged at the axial end face of the bearing bush, which is far away from the gap, and the limiting piece can drive the bearing bush to move and reduce the size of the gap.
The limiting piece simultaneously plays a role in driving the bearing bush to move and keeping the gap between the lower end face of the bearing bush and the upper end face of the annular protrusion.
An assembling method of the supporting case bearing bush precise assembling clamp with the nut comprises the following steps,
step one, a bearing bush is installed in a first installation edge of a supporting casing;
installing the underframe at a second installation edge, wherein the arc-shaped locating surface of the boss surface of the underframe is matched and located with the second inner circular surface of the second installation edge, and the upper end surface of the boss of the underframe is tightly attached to the lower end surface of the second installation edge;
step three, placing the pressing plate into the stud from one side of the first mounting edge of the supporting casing through the through hole, ensuring that an arc-shaped pressing surface of the outer circumferential surface of the pressing plate is contacted with the first inner circular surface, screwing the nut into the stud, and driving the pressing plate to move towards the bearing bush through rotating the nut, so that the bearing bush is extruded, and a gap between the lower end surface of the bearing bush and the upper end surface of the annular protrusion is reduced;
fourthly, maintaining the position of the pressing plate unchanged through the fixing nut for a period of time, and then checking whether the clearance value between the lower end face and the upper end face of the annular bulge is qualified or not;
and fifthly, if the gap value is qualified, disassembling the nut, the pressing plate and the underframe.
Further, in the first step, the bearing bush is placed in liquid nitrogen to be cooled for a period of time before being mounted on the first mounting edge of the supporting casing.
In the fourth step, a clearance between the outer circular surface of the bearing bush and the upper end surface of the annular bulge is detected through a feeler gauge.
Compared with the prior art, the assembly fixture and the assembly method have the following characteristics:
1) By adopting the assembly fixture, repeated beating of the bearing bush can be avoided on the premise of ensuring that the clearance meets the requirement, the labor intensity is reduced, the production process is accelerated, the arc-shaped compression surface of the pressing plate is divided into a plurality of blocks, the friction resistance (the friction contact area) when the whole surface moves relative to the first inner circular surface is reduced, meanwhile, the lower end surface of the pressing plate is limited by the nut, and the action of the arc-shaped positioning surface on the bottom plate is matched, so that the clearance of the axial end surface of the bearing bush is ensured to be qualified (the clearance is not qualified because the bearing bush is partially separated from the first inner circular hole due to deformation extrusion force generated by interference assembly of the bearing bush), and the bearing bush is coaxial with the first inner circular surface of the first installation edge, and the radial clearance is uniform;
2) By adopting the assembly method, the assembly clearance of the axial end face of the bearing bush after interference assembly is controlled to be not more than 0.02mm, the processing quality of the supporting casing is ensured, and the nut and the pressing plate can uniformly press the bearing bush, so that the clearance between the lower end face of the whole bearing bush and the upper end face of the annular bulge on the first inner circular face is uniform and meets the requirements.
Drawings
FIG. 1 is a schematic diagram of an assembly of a bearing cartridge supporting a casing bearing cartridge;
FIG. 2 is a schematic structural view of an assembly jig;
FIG. 3 is an enlarged view of the partial area A of FIG. 1;
FIG. 4 is a schematic illustration of an assembled state of a support case bearing bushing assembly fixture;
in the figure, 1, a chassis, 2, a pressing plate, 3, a nut, 4, a first mounting edge, 5, a second mounting edge, 6, a stud, 7, a chassis boss, 8, a bearing bush and 9, a gap.
Detailed Description
The present invention will be further described with reference to the drawings and the specific embodiments, but it should not be construed that the scope of the subject matter of the present invention is limited to the following embodiments, and various modifications, substitutions and alterations made according to the ordinary skill and familiar means of the art to which this invention pertains are included within the scope of the present invention without departing from the above technical idea of the invention.
As shown in fig. 1 and 3, the supporting casing includes a first mounting edge 4 and a second mounting edge 5 which are coaxial, the inner side of the first mounting edge 4 is a first inner circular surface, one end of the first inner circular surface is provided with an annular bulge, the inner side of the second mounting edge 5 is a second inner circular surface, the outer circular surface of the bearing bush 8 is in interference fit with the first inner circular surface (the outer diameter size of the bearing bush 8 is 0.145-0.070 mm larger than the inner diameter of the first inner circular surface of the first mounting edge 4), and a gap 9 is formed between the lower end surface of the bearing bush 8 and the upper end surface of the annular bulge of the first inner circular surface.
As shown in fig. 2, the invention designs a precision assembly fixture for a supporting casing and a bearing bush, which mainly comprises a chassis 1, a pressing plate 2, a nut 3, a stud 6 and a chassis boss 7. The chassis 1 is provided with studs 6 for connecting the pressing plate 2 and 4 chassis bosses 7 for positioning, and the diameter of a first cylindrical surface where the end surface (arc positioning surface) of the outermost arc section of the 4 chassis bosses 7 is positioned isThe first cylindrical axis is coaxial with the stud 6. The chassis boss 7 has a height of bmm. The precision assembly fixture is fixed in the circular hole of the second mounting edge 5 of the supporting casing (matched with the second inner circular surface) by limiting the chassis 1 by the chassis boss 7, and the inner diameter of the second inner circular surface is +.>The depth (b+0.5) mm is used for positioning the stud 6 to be coaxial with the first installation edge 4 and the second installation edge 5 of the supporting casing, and four supporting feet (the supporting feet take the stud 6 as the center and are positioned on radial lines, and the included angle between two adjacent supporting feet is 90 degrees) on the chassis 1 are fixedly clung to the end face of the second installation edge 5; the pressing plate 2 is sleeved and matched with the stud 6 through a through hole in the center of the pressing plate 2, and the diameter of the through hole in the center of the pressing plate 2 is +.>The diameter of the stud 6 is +.>The pressing plate 2 comprises three pressing rods (adjacent to each other)The included angle between the two compression bars is 120 degrees, one ends of the three compression bars are connected together), and the diameter of the second cylindrical surface where the arc sections (arc compression surfaces) at the tail ends of the three compression bars are positioned is +>The inner diameter of the first inner circular surface corresponding to the first mounting edge 4 of the bearing housing is +.>The method comprises the steps of carrying out a first treatment on the surface of the The screw thread on the stud 6 is MC (C corresponds to the aperture value of the same hole), and the aperture of the inner hole of the nut 3 is MC (C corresponds to the aperture value of the screw hole); the pressing plate 2 is assembled on the stud 6, and the nut 3 is in threaded fit with the stud 6 to press and drive the pressing plate 2 to move on the stud 6, wherein A > E > C > b.
The pressing plate 2 has the functions of axial limiting, axial compressing and radial positioning, and the outer circumferential end surface of the pressing plate is an arc-shaped compressing surface which is matched with the inner diameter of the first inner circular surface of the first mounting edge 4 but is larger than the outer diameter of the bearing bush 8. And because the height of the bearing bush 8 is smaller than the height of the first inner circular surface of the first mounting edge 4, the pressing plate 2 can be clamped in the first inner circular surface and is continuously screwed by the nut 3, the bearing bush 8 and the first mounting edge 4 are tightly pressed in the axial direction, and the value of the clearance 9 is ensured to be less than or equal to 0.02mm
Taking the bearing casing and bearing bush 8 of fig. 1 as an example, as shown in fig. 4, a specific embodiment of the assembly process is as follows:
1. placing the bearing bush 8 in a porcelain basin containing liquid nitrogen, ensuring that the liquid nitrogen floods the bearing bush 8, waiting for 10-15 min, assembling the bearing bush 8 into a round hole of the first mounting edge 4 to be in interference fit with the first inner circular surface after the bearing bush 8 is cooled, and tightly attaching the lower end surface of the bearing bush 8 to the upper surface of the annular protrusion on the first inner circular surface;
2. the underframe 1 is assembled on the second installation edge 5, the arc-shaped positioning surface of the outer circumference of the underframe boss 7 is fixed in a round hole of the second installation edge 5 (matched with the second inner round surface), and the upper surface of the underframe boss 7 is tightly attached to the lower end surface of the second installation edge 5;
3. the pressing plate 2 is assembled on a stud 6 connected with the underframe 1 through a through hole;
4. the nut 3 is assembled on the stud 6 of the chassis 1 and is screwed by a torque wrench, so that the pressing plate 2 moves, the arc-shaped pressing surface of the pressing plate 2 is pressed into the first inner circular surface and is attached to the first inner circular surface, the lower end surface of the pressing plate 2 completely props against the upper end surface of the bearing bush 8, the position is kept for 5 minutes (namely, the nut 3 and the pressing plate 2 are not moved), a clearance 9 between the bearing bush 8 and the first inner circular surface of the first installation edge 4 is checked by a feeler gauge to be not more than 0.02mm, and in the process, the whole fixture is kept fixed, and the bearing bush 8 is restored to normal temperature on the premise that the clearance 9 is not more than 0.02 mm;
5. and disassembling the nut 3 on the precise assembly fixture, disassembling the pressing plate 2 on the precise assembly fixture, and taking down the underframe 1 of the precise assembly fixture.
The method can be applied to the assembly process of the similar parts such as the supporting casing, the rectifying supporting casing and the like, and the application of the method can improve the one-time assembly qualification rate of the parts to 100 percent; the use of the invention ensures that the assembly clearance of the bearing bush 8 meets the requirement of 0.02 mm.
Claims (2)
1. The utility model provides a support cartridge receiver bearing bush precision assembly method, including coaxial first installation limit (4) and second installation limit (5) on the support cartridge receiver, first installation limit (4) inboard is first interior round surface, and there is an annular bulge one end of first interior round surface, and second installation limit (5) inboard is the second interior round surface, and the outer round surface and the first interior round surface interference fit of bearing bush (8), have a clearance (9) between the lower terminal surface of bearing bush (8) and the bellied up end of annular:
the precision assembly jig used includes,
a stud (6);
the novel lifting device comprises a bottom frame (1), wherein the bottom frame (1) is connected with one end of a stud (6), a plurality of upward protruding bottom frame bosses (7) are arranged on the upper end face of the bottom frame (1), an arc-shaped positioning surface is arranged on the surface of each bottom frame boss (7), the arc-shaped positioning surfaces on the surfaces of the plurality of bottom frame bosses (7) are all located on a first cylindrical surface taking the stud (6) as an axis, the outer diameter of the first cylindrical surface is equal to the inner diameter of a second inner circular surface, the bottom frame (1) comprises a plurality of linear supporting legs, one ends of the plurality of supporting legs are intersected with the stud (6), the number of the supporting legs is four, and an included angle between every two adjacent supporting legs is 90 degrees;
the pressing plate (2) is provided with a through hole, the pressing plate (2) is connected with the stud (6) through the through hole, a plurality of arc-shaped pressing surfaces are arranged on the outer circumferential surface of the pressing plate (2), the arc-shaped pressing surfaces are all positioned on a second cylindrical surface taking the stud (6) as an axis, and the outer diameter of the second cylindrical surface is equal to the inner diameter of the first inner circular surface; the pressing plate (2) comprises a plurality of linear pressing rods, one ends of the plurality of pressing rods are intersected at the through holes, the end face of the other end of each pressing rod is an arc-shaped pressing surface, three pressing rods are provided, and the included angle between every two adjacent pressing rods is 120 degrees;
the nut (3) is connected to the stud (6);
the method of assembly comprises the steps of,
firstly, putting a bearing bush (8) into liquid nitrogen to be cooled for a period of time, and then putting the bearing bush (8) into a first mounting edge (4) of a supporting casing;
installing the underframe (1) at the second installation edge (5), wherein the arc-shaped locating surface of the underframe boss (7) is matched and located with the second inner circular surface of the second installation edge (5), and the upper end surface of the underframe (1) is tightly attached to the lower end surface of the second installation edge (5);
step three, placing the pressing plate (2) into the stud (6) from one side of the first mounting edge (4) of the supporting casing through the through hole, ensuring that an arc-shaped pressing surface of the outer circumferential surface of the pressing plate (2) is in contact with the first inner circular surface, screwing the nut (3) into the stud (6), driving the pressing plate (2) to move towards the bearing bush (8) through rotating the nut (3), and pressing the bearing bush (8) so that a gap (9) between the lower end surface of the bearing bush (8) and the upper end surface of the annular bulge is reduced;
fourthly, keeping the position of the pressing plate (2) unchanged through the fixing nut (3) for a period of time, and then checking whether the gap (9) between the lower end face and the upper end face of the annular bulge is qualified or not;
fifthly, if the value of the gap (9) is qualified, the nut (3), the pressing plate (2) and the underframe (1) are disassembled.
2. The method of assembly of claim 1, wherein: in the fourth step, a clearance (9) between the lower end face of the bearing bush (8) and the upper end face of the annular bulge is detected through a feeler gauge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111339531.XA CN113977518B (en) | 2021-11-12 | 2021-11-12 | Precise assembly fixture and assembly method for bearing sleeve of supporting casing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111339531.XA CN113977518B (en) | 2021-11-12 | 2021-11-12 | Precise assembly fixture and assembly method for bearing sleeve of supporting casing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113977518A CN113977518A (en) | 2022-01-28 |
| CN113977518B true CN113977518B (en) | 2023-08-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111339531.XA Active CN113977518B (en) | 2021-11-12 | 2021-11-12 | Precise assembly fixture and assembly method for bearing sleeve of supporting casing |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU774895A2 (en) * | 1978-12-04 | 1980-10-30 | Украинский Заочный Политехнический Институт | Machine for heated assembling and dismantling of parts |
| CN202964557U (en) * | 2012-11-05 | 2013-06-05 | 中国航空工业集团公司沈阳发动机设计研究所 | Aircraft bearing installation compression device |
| CN103252619A (en) * | 2013-05-02 | 2013-08-21 | 湖北三江航天江北机械工程有限公司 | Combined milling method of shell body of bearing ball socket swing nozzle and fixture thereof |
| CN105234627A (en) * | 2015-10-28 | 2016-01-13 | 重庆隆兆机械有限公司 | Assembly tool for shaft and sleeve type assembly |
| CN112276475A (en) * | 2020-10-29 | 2021-01-29 | 鹰普航空科技有限公司 | Magnet assembling tool and assembling process matched with liquid nitrogen cold-charging technology for application |
-
2021
- 2021-11-12 CN CN202111339531.XA patent/CN113977518B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU774895A2 (en) * | 1978-12-04 | 1980-10-30 | Украинский Заочный Политехнический Институт | Machine for heated assembling and dismantling of parts |
| CN202964557U (en) * | 2012-11-05 | 2013-06-05 | 中国航空工业集团公司沈阳发动机设计研究所 | Aircraft bearing installation compression device |
| CN103252619A (en) * | 2013-05-02 | 2013-08-21 | 湖北三江航天江北机械工程有限公司 | Combined milling method of shell body of bearing ball socket swing nozzle and fixture thereof |
| CN105234627A (en) * | 2015-10-28 | 2016-01-13 | 重庆隆兆机械有限公司 | Assembly tool for shaft and sleeve type assembly |
| CN112276475A (en) * | 2020-10-29 | 2021-01-29 | 鹰普航空科技有限公司 | Magnet assembling tool and assembling process matched with liquid nitrogen cold-charging technology for application |
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| Publication number | Publication date |
|---|---|
| CN113977518A (en) | 2022-01-28 |
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