Combined repair method for split processing case shell

Abstract

This invention belongs to the field of mechanical structure maintenance technology and discloses a method for repairing modular machine housings. The method involves inspecting and replacing the bearing bushings, locating pins, and locating pin holes on each of the modular housing components. Then, the bearing bushings and locating pins on each housing are removed, and the housings are assembled and secured. Using the external accessory stops of each housing as a reference, the bearing bushings on both sides of the shaft system of the modular housing are machined coaxially. Next, the housings are separated, and two coaxially machined shaft bearing bushings are selected as references to establish a coordinate system. The positional accuracy of the bearing bushings at the blind hole locations is then checked and repaired. Finally, the multiple housings are assembled, and the coaxiality of the bearing bushings is tested. Based on the structural characteristics of the housing, this invention uses a method of ensuring coaxiality of bearing bushings at through holes and ensuring positional accuracy of bearing bushings at blind holes, thus enabling the repairability of housings with blind hole structures.

Description

Technical Field

[0001] This invention belongs to the field of mechanical structure maintenance technology, and relates to a method for repairing a casing, specifically a method for repairing a casing by processing parts separately. Background Technology

[0002] The casing is a crucial component in mechanical structures. As the external support and protection part of the mechanical transmission system, it supports and protects the various internal components, ensuring stable system operation. The casing is typically a closed cavity, providing a safe, sealed space for components such as gear shafts, bearings, and centrifugal ventilators, preventing interference and damage from the external environment. The casing material is usually made of low-density magnesium alloys or aluminum alloys to meet the lightweight requirements of mechanical transmission systems.

[0003] For ease of assembly, the gear housing requires a split structure, consisting of multiple housings. Each housing is fitted with a bearing bushing to support and protect the bearings, reducing friction and wear between the bearings and the gear housing. To ensure the positioning accuracy of each shaft system, the bearing bushings require high machining precision. This is achieved by using locating pins on individual gear housings to ensure positional accuracy, or by combining multiple gear housings for machining to ensure coaxiality. During operation, under the influence of external accessory loads, the gear housing inevitably undergoes some degree of deformation. This leads to reduced gear shaft positioning accuracy, decreased gear running smoothness, and wear or deformation of the bearing bushings, further exacerbating the deformation of the gear housing. Therefore, regular inspections are necessary during use. If severely worn or damaged bearing bushings are found, they should be replaced promptly to ensure the normal operation of the mechanical transmission system.

[0004] Due to structural limitations, some housings have blind hole structures for their shafts, meaning there are no external through holes on either side of the housing. The bearing bushings on each housing are machined separately. After prolonged operation, when the housing deforms significantly, replacing the bearing bushings cannot guarantee the original positional accuracy, leading to the complete scrapping of the housing during repairs. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a combined repair method for separately machined casings, offering a new repair method for casings that cannot be machined in combination due to structural limitations, thus avoiding the situation where the entire casing is scrapped.

[0006] The technical solution of the present invention is as follows:

[0007] A method for repairing a modular housing involves inspecting and replacing the bearing bushings, locating pins, and locating pin holes on each of the modular housing components. Then, the bearing bushings and locating pins on each housing are removed, and the housings are assembled and secured. Next, using the external accessory stops of each housing as a reference, the bearing bushings on both sides of the shaft system of the modular housing are machined coaxially. The housings are then separated, and two coaxially machined shaft bearing bushings are selected as references to establish a coordinate system. The positional accuracy of the bearing bushings at the blind hole locations is checked and repaired. Finally, the multiple housings are assembled, and the coaxiality of the bearing bushings is tested.

[0008] Furthermore, the specific steps include:

[0009] S1. Use a coordinate measuring machine to check the diameter, position, and coaxiality of the bearing bushings, locating pins, and locating pin holes on each housing.

[0010] S2, Based on the measurement results, determine the bearing bushings that need to be replaced in each shaft system of the split casing;

[0011] S3, replace the bearing bushing, and then remove the bearing bushing locating pins from each housing mating surface;

[0012] S4, combine multiple casing housings and secure them with nuts;

[0013] S5, using the external accessory stop of each casing as a reference, combine and machine the bearing bushings on both sides of the corresponding shaft system to ensure the coaxiality of the bearing bushings on both sides.

[0014] S6, Machining the locating pin holes on the mating surfaces between the casing housings, and then separating the casing housings;

[0015] S7, process the bearing bushings at the blind hole positions on a single casing housing, select any two locations to process the shaft bearing bushings together as a reference, establish a coordinate system, and ensure the positional accuracy of the bearing bushings at the blind hole positions;

[0016] S8. After assembling multiple housings and securing them with nuts, the coaxiality of the bearing bushings is checked to ensure the accuracy requirements of each shaft system.

[0017] Furthermore, in S3, when replacing the bearing bushing, the machining position of the bearing bushing bottom hole is re-determined based on the inspection results of S1, and the hole is drilled.

[0018] Furthermore, in S4, when multiple housings are assembled, no less than half the number of nuts and screws are used in normal assembly.

[0019] Furthermore, in S5, if the shaft system on the casing housing is a through-hole structure but there is no external accessory stop, the bearing bushing on the other side is measured with one side bearing bushing as a reference.

[0020] Furthermore, in S6, after machining the locating pin hole, a tapering structure is adopted or glue is applied to the mating hole between the locating pin and the housing to prevent the locating pin from falling off during use.

[0021] Furthermore, in S7, the bearing bushing of the shaft system with an external stop is selected as the reference.

[0022] Furthermore, in S8, the position of the fastening nut during assembly is the same as in S4.

[0023] The beneficial effects of this invention are as follows:

[0024] This invention proposes a repair method for a structurally limited casing. During the repair process, based on the structural characteristics of the casing, a method is adopted to ensure coaxiality using through-hole bearing bushings and positional accuracy using blind-hole bearing bushings, thereby ensuring the positioning accuracy of the gear shaft in the mechanical transmission system. This enables the repairable blind-hole structure casing, avoids the complete scrapping of the casing, and saves repair costs. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this invention, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the assembled casing.

[0027] Figure 2 A schematic diagram of the machining of the locating pin assembly.

[0028] Figure 3 This is a schematic diagram of the machining of the casing 1 unit after assembly repair.

[0029] Figure 4 This is a schematic diagram of the machining of individual units after the combined repair of the casing housing 2.

[0030] In the diagram, 01 to 06 represent different shaft systems. Detailed Implementation

[0031] This section describes embodiments of the present invention, used to explain and illustrate the technical solutions of the present invention. Unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0032] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating directions or positional relationships, are given in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or device referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include more than one of those features. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0033] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integrated connection; they can refer to a mechanical connection or a point connection; they can refer to a direct connection or a connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] Example 1:

[0035] A method for repairing a modular housing involves inspecting and replacing the bearing bushings, locating pins, and locating pin holes on each of the modular housing components. Then, the bearing bushings and locating pins on each housing are removed, and the housings are assembled and secured. Next, using the external accessory stops of each housing as a reference, the bearing bushings on both sides of the shaft system of the modular housing are machined coaxially. The housings are then separated, and two coaxially machined shaft bearing bushings are selected as references to establish a coordinate system. The positional accuracy of the bearing bushings at the blind hole locations is checked and repaired. Finally, the multiple housings are assembled, and the coaxiality of the bearing bushings is tested.

[0036] Specifically, the following steps are included:

[0037] S1. Use a coordinate measuring machine to check the diameter, position, and coaxiality of the bearing bushings, locating pins, and locating pin holes on each housing.

[0038] S2, Based on the measurement results, determine the bearing bushings that need to be replaced in each shaft system of the split casing;

[0039] S3, replace the bearing bushing, and then remove the bearing bushing locating pins from each housing mating surface;

[0040] S4, combine multiple casing housings and secure them with nuts;

[0041] S5, using the external accessory stop of each casing as a reference, combine and machine the bearing bushings on both sides of the corresponding shaft system to ensure the coaxiality of the bearing bushings on both sides.

[0042] S6, Machining the locating pin holes on the mating surfaces between the casing housings, and then separating the casing housings;

[0043] S7, process the bearing bushings at the blind hole positions on a single casing housing, select any two locations to process the shaft bearing bushings together as a reference, establish a coordinate system, and ensure the positional accuracy of the bearing bushings at the blind hole positions;

[0044] S8. After assembling multiple housings and securing them with nuts, the coaxiality of the bearing bushings is checked to ensure the accuracy requirements of each shaft system.

[0045] In S3, when replacing the bearing bushing, the machining position of the bearing bushing bottom hole is re-determined based on the inspection results of S1, and the hole is drilled.

[0046] In S4, when multiple casings are assembled, no less than half the number of nuts and screws are used in normal assembly.

[0047] In S5, if the shaft system on the casing is a through-hole structure but there is no external accessory stop, the bearing bushing on the other side is measured with one side bearing bushing as the reference.

[0048] In S6, after machining the locating pin hole, a tapering structure is used or glue is applied to the mating hole between the locating pin and the housing to prevent the locating pin from falling off during use.

[0049] In S7, the bearing bushing of the shaft system with an external stop is selected as the reference.

[0050] In S8, the position of the fastening nut during assembly is the same as in S4.

[0051] Example 2:

[0052] Step 1: Use a coordinate measuring machine to inspect the diameter, position, and coaxiality of the bearing bushings, locating pins / pin holes, and external accessory stops on the casing housing 1 and casing housing 2. Select a sufficient number of coordinate points when measuring the reference plane to ensure measurement accuracy.

[0053] Step 2: Based on the measurement results, evaluate the bearing bushings that need to be replaced for each shaft system. If the accuracy of the bearing bushing on one side of the same shaft system does not meet the requirements, the bearing bushings on both sides of the shaft system should be replaced to avoid repeated replacement and machining during subsequent repairs.

[0054] Step 3: Replace the bearing bushing with one that exceeds the required size, and remove the bearing bushing locating pin from the mating surface of the casing. When replacing the bearing bushing, the bearing bushing mating hole on the casing should no longer be machined in the position specified in the drawing. The machining position of the bearing bushing hole should be adjusted according to the inspection results of Step 1.

[0055] In some alternative embodiments, after the bearing bushing on the casing is assembled, it needs to be machined again. At this time, the inner hole of the bearing bushing has a large allowance, and the bottom hole of the bearing bushing on the casing can be machined according to the position specified in the drawing.

[0056] Step 4: Assemble the casing housing 1 and casing housing 2 together and fasten them with screws and nuts. The number of nuts installed on the mating surfaces should be no less than half of that under normal assembly conditions to avoid the impact of casing housing deformation on subsequent processing.

[0057] Step 5: Using the external accessory stops of the O1 and O6 shaft systems on the casing 1 and the O3 and O5 shaft systems on the casing 2 as references, perform combined machining on the bearing bushings on both sides of the above shaft systems to ensure coaxiality requirements.

[0058] In some alternative embodiments, the shaft system on the casing housing has a through-hole structure but no external accessory stop. The bearing bushing on one side can be used as a reference to process the bearing bushing on the other side, or a combined reference method can be used for processing to ensure coaxiality requirements.

[0059] Step 6: Perform assembly machining on the mating surfaces of casing housing 1 and casing housing 2 to create locating pin holes. After machining, the locating pin positions will be through holes. A tapered structure or adhesive can be applied to the mating holes between the locating pins and the casing housing to prevent the locating pins from falling off during use. See [link to details regarding tapering and adhesive application]. Figure 2 ;

[0060] Step 7: After completing the assembly process, separate the casing housing 1 and the casing housing 2.

[0061] Step 8: Machin the bearing bushings at the blind hole positions of shafts O2 and O4 on the casing housing 1. Use the bearing bushings of shafts O1 and O6 as a reference to establish a coordinate system and ensure the positional accuracy requirements of the bearing bushings of shafts O2 and O4.

[0062] In some alternative implementations, the bearing bushings of shafts O3 and O5 can be selected as references to establish a coordinate system;

[0063] Step 9: Machin the bearing bushings at the blind hole positions of shafts O2 and O4 on the casing housing 2. Use the bearing bushings of shafts O1 and O6 as a reference (the shaft system used as the reference should be consistent with step 8) to establish a coordinate system and ensure the positional accuracy requirements of the bearing bushings of shafts O2 and O4.

[0064] In some alternative implementations, the bearing bushings of shafts O3 and O5 can be selected as references (the shaft system used as the reference should be consistent with step 8) to establish a coordinate system;

[0065] Step 10: Assemble the casing housing 1 and casing housing 2 together and fasten them with screws and nuts. The position of the fastening nuts and the requirements for precise plane measurement should be consistent with those in Step 4. Check the coaxiality of the bearing bushings to ensure the accuracy requirements of each shaft system.

[0066] This implementation plan uses two separate casing housings as an example to introduce the combined repair steps for separate casing housings. For more separate casing housings, the above steps should be followed to repair the bearing bushings at the through-hole and blind-hole positions. The furthest shaft system of the casing housing should be selected as the reference whenever possible to ensure measurement accuracy.

[0067] This repair scheme is a repair method for special structure casing housings. By transforming the reference, a new coordinate system is established to ensure the positioning accuracy requirements of the blind hole bearing bushing. This enables the blind hole bearing bushing on the casing housing to be repairable, effectively reducing the overall repair scrap rate of the casing housing and saving repair costs of the mechanical transmission system.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should be covered within the protection scope of the present invention.

Claims

1. A method for repairing a separately machined casing, characterized in that, Inspect and replace the bearing bushings, locating pins, and locating pin holes on each of the individual housings that make up the split housing. Then, remove the bearing bushings and locating pins from each housing, assemble and tighten the housings, and then, using the external accessory stop of each housing as a reference, perform coaxial machining on the bearing bushings on both sides of the shaft system of the split housing. Next, separate the housings, select any two coaxially machined shaft bearing bushings as references, establish a coordinate system, and check and repair the positional accuracy of the bearing bushings at the blind hole locations. Finally, assemble the multiple housings and test the coaxiality of the bearing bushings.

2. The method for combined repair of a split-processing machine housing according to claim 1, characterized in that, Specifically, the following steps are included: S1. Use a coordinate measuring machine to check the diameter, position, and coaxiality of the bearing bushings, locating pins, and locating pin holes on each housing. S2, Based on the measurement results, determine the bearing bushings that need to be replaced in each shaft system of the split casing; S3, replace the bearing bushing, and then remove the bearing bushing locating pins from each housing mating surface; S4, combine multiple casing housings and secure them with nuts; S5, using the external accessory stop of each casing as a reference, combine and machine the bearing bushings on both sides of the corresponding shaft system to ensure the coaxiality of the bearing bushings on both sides. S6, Machining the locating pin holes on the mating surfaces between the casing housings, and then separating the casing housings; S7, process the bearing bushings at the blind hole positions on a single casing housing, select any two locations to process the shaft bearing bushings together as a reference, establish a coordinate system, and ensure the positional accuracy of the bearing bushings at the blind hole positions; S8. After assembling multiple housings and securing them with nuts, the coaxiality of the bearing bushings is checked to ensure the accuracy requirements of each shaft system.

3. The method for combined repair of a split-processing machine housing according to claim 2, characterized in that, In S3, when replacing the bearing bushing, the machining position of the bearing bushing bottom hole is re-determined based on the inspection results of S1, and the hole is drilled.

4. The method for combined repair of a split-processing machine housing according to claim 2, characterized in that, In S4, when multiple casings are assembled, no less than half the number of nuts and screws are used in normal assembly.

5. The method for combined repair of a split-processing machine housing according to claim 2, characterized in that, In S5, if the shaft system on the casing is a through-hole structure but there is no external accessory stop, the bearing bushing on one side is used as a reference to measure the bearing bushing on the other side.

6. The method for combined repair of a split-processing machine housing according to claim 2, characterized in that, In S6, after machining the locating pin hole, a tapering structure is used or glue is applied to the mating hole between the locating pin and the housing to prevent the locating pin from falling off during use.

7. The method for combined repair of a split-processed casing according to claim 2, characterized in that, In S7, the bearing bushing of the shaft system with an external stop is selected as the reference.

8. The method for combined repair of a split-processing machine housing according to claim 2, characterized in that, In S8, the position of the fastening nut during assembly is the same as in S4.

Images